LCOV - code coverage report
Current view: top level - lib/nvmf - rdma.c (source / functions) Hit Total Coverage
Test: ut_cov_unit.info Lines: 668 2400 27.8 %
Date: 2024-07-15 16:17:25 Functions: 30 119 25.2 %

          Line data    Source code
       1             : /*   SPDX-License-Identifier: BSD-3-Clause
       2             :  *   Copyright (C) 2016 Intel Corporation. All rights reserved.
       3             :  *   Copyright (c) 2019-2021 Mellanox Technologies LTD. All rights reserved.
       4             :  *   Copyright (c) 2021-2024 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
       5             :  */
       6             : 
       7             : #include "spdk/stdinc.h"
       8             : 
       9             : #include "spdk/config.h"
      10             : #include "spdk/thread.h"
      11             : #include "spdk/likely.h"
      12             : #include "spdk/nvmf_transport.h"
      13             : #include "spdk/string.h"
      14             : #include "spdk/trace.h"
      15             : #include "spdk/tree.h"
      16             : #include "spdk/util.h"
      17             : 
      18             : #include "spdk_internal/assert.h"
      19             : #include "spdk/log.h"
      20             : #include "spdk_internal/rdma_provider.h"
      21             : #include "spdk_internal/rdma_utils.h"
      22             : 
      23             : #include "nvmf_internal.h"
      24             : #include "transport.h"
      25             : 
      26             : #include "spdk_internal/trace_defs.h"
      27             : 
      28             : struct spdk_nvme_rdma_hooks g_nvmf_hooks = {};
      29             : const struct spdk_nvmf_transport_ops spdk_nvmf_transport_rdma;
      30             : 
      31             : /*
      32             :  RDMA Connection Resource Defaults
      33             :  */
      34             : #define NVMF_DEFAULT_MSDBD              16
      35             : #define NVMF_DEFAULT_TX_SGE             SPDK_NVMF_MAX_SGL_ENTRIES
      36             : #define NVMF_DEFAULT_RSP_SGE            1
      37             : #define NVMF_DEFAULT_RX_SGE             2
      38             : 
      39             : #define NVMF_RDMA_MAX_EVENTS_PER_POLL   32
      40             : 
      41             : SPDK_STATIC_ASSERT(NVMF_DEFAULT_MSDBD <= SPDK_NVMF_MAX_SGL_ENTRIES,
      42             :                    "MSDBD must not exceed SPDK_NVMF_MAX_SGL_ENTRIES");
      43             : 
      44             : /* The RDMA completion queue size */
      45             : #define DEFAULT_NVMF_RDMA_CQ_SIZE       4096
      46             : #define MAX_WR_PER_QP(queue_depth)      (queue_depth * 3 + 2)
      47             : 
      48             : enum spdk_nvmf_rdma_request_state {
      49             :         /* The request is not currently in use */
      50             :         RDMA_REQUEST_STATE_FREE = 0,
      51             : 
      52             :         /* Initial state when request first received */
      53             :         RDMA_REQUEST_STATE_NEW,
      54             : 
      55             :         /* The request is queued until a data buffer is available. */
      56             :         RDMA_REQUEST_STATE_NEED_BUFFER,
      57             : 
      58             :         /* The request is waiting on RDMA queue depth availability
      59             :          * to transfer data from the host to the controller.
      60             :          */
      61             :         RDMA_REQUEST_STATE_DATA_TRANSFER_TO_CONTROLLER_PENDING,
      62             : 
      63             :         /* The request is currently transferring data from the host to the controller. */
      64             :         RDMA_REQUEST_STATE_TRANSFERRING_HOST_TO_CONTROLLER,
      65             : 
      66             :         /* The request is ready to execute at the block device */
      67             :         RDMA_REQUEST_STATE_READY_TO_EXECUTE,
      68             : 
      69             :         /* The request is currently executing at the block device */
      70             :         RDMA_REQUEST_STATE_EXECUTING,
      71             : 
      72             :         /* The request finished executing at the block device */
      73             :         RDMA_REQUEST_STATE_EXECUTED,
      74             : 
      75             :         /* The request is waiting on RDMA queue depth availability
      76             :          * to transfer data from the controller to the host.
      77             :          */
      78             :         RDMA_REQUEST_STATE_DATA_TRANSFER_TO_HOST_PENDING,
      79             : 
      80             :         /* The request is waiting on RDMA queue depth availability
      81             :          * to send response to the host.
      82             :          */
      83             :         RDMA_REQUEST_STATE_READY_TO_COMPLETE_PENDING,
      84             : 
      85             :         /* The request is ready to send a completion */
      86             :         RDMA_REQUEST_STATE_READY_TO_COMPLETE,
      87             : 
      88             :         /* The request is currently transferring data from the controller to the host. */
      89             :         RDMA_REQUEST_STATE_TRANSFERRING_CONTROLLER_TO_HOST,
      90             : 
      91             :         /* The request currently has an outstanding completion without an
      92             :          * associated data transfer.
      93             :          */
      94             :         RDMA_REQUEST_STATE_COMPLETING,
      95             : 
      96             :         /* The request completed and can be marked free. */
      97             :         RDMA_REQUEST_STATE_COMPLETED,
      98             : 
      99             :         /* Terminator */
     100             :         RDMA_REQUEST_NUM_STATES,
     101             : };
     102             : 
     103           2 : SPDK_TRACE_REGISTER_FN(nvmf_trace, "nvmf_rdma", TRACE_GROUP_NVMF_RDMA)
     104             : {
     105           0 :         spdk_trace_register_object(OBJECT_NVMF_RDMA_IO, 'r');
     106             : 
     107           0 :         struct spdk_trace_tpoint_opts opts[] = {
     108             :                 {
     109             :                         "RDMA_REQ_NEW", TRACE_RDMA_REQUEST_STATE_NEW,
     110             :                         OWNER_TYPE_NONE, OBJECT_NVMF_RDMA_IO, 1,
     111             :                         {
     112             :                                 { "qpair", SPDK_TRACE_ARG_TYPE_PTR, 8 },
     113             :                                 { "qd", SPDK_TRACE_ARG_TYPE_INT, 4 }
     114             :                         }
     115             :                 },
     116             :                 {
     117             :                         "RDMA_REQ_COMPLETED", TRACE_RDMA_REQUEST_STATE_COMPLETED,
     118             :                         OWNER_TYPE_NONE, OBJECT_NVMF_RDMA_IO, 0,
     119             :                         {
     120             :                                 { "qpair", SPDK_TRACE_ARG_TYPE_PTR, 8 },
     121             :                                 { "qd", SPDK_TRACE_ARG_TYPE_INT, 4 }
     122             :                         }
     123             :                 },
     124             :         };
     125             : 
     126           0 :         spdk_trace_register_description_ext(opts, SPDK_COUNTOF(opts));
     127           0 :         spdk_trace_register_description("RDMA_REQ_NEED_BUFFER", TRACE_RDMA_REQUEST_STATE_NEED_BUFFER,
     128             :                                         OWNER_TYPE_NONE, OBJECT_NVMF_RDMA_IO, 0,
     129             :                                         SPDK_TRACE_ARG_TYPE_PTR, "qpair");
     130           0 :         spdk_trace_register_description("RDMA_REQ_TX_PENDING_C2H",
     131             :                                         TRACE_RDMA_REQUEST_STATE_DATA_TRANSFER_TO_HOST_PENDING,
     132             :                                         OWNER_TYPE_NONE, OBJECT_NVMF_RDMA_IO, 0,
     133             :                                         SPDK_TRACE_ARG_TYPE_PTR, "qpair");
     134           0 :         spdk_trace_register_description("RDMA_REQ_TX_PENDING_H2C",
     135             :                                         TRACE_RDMA_REQUEST_STATE_DATA_TRANSFER_TO_CONTROLLER_PENDING,
     136             :                                         OWNER_TYPE_NONE, OBJECT_NVMF_RDMA_IO, 0,
     137             :                                         SPDK_TRACE_ARG_TYPE_PTR, "qpair");
     138           0 :         spdk_trace_register_description("RDMA_REQ_TX_H2C",
     139             :                                         TRACE_RDMA_REQUEST_STATE_TRANSFERRING_HOST_TO_CONTROLLER,
     140             :                                         OWNER_TYPE_NONE, OBJECT_NVMF_RDMA_IO, 0,
     141             :                                         SPDK_TRACE_ARG_TYPE_PTR, "qpair");
     142           0 :         spdk_trace_register_description("RDMA_REQ_RDY_TO_EXECUTE",
     143             :                                         TRACE_RDMA_REQUEST_STATE_READY_TO_EXECUTE,
     144             :                                         OWNER_TYPE_NONE, OBJECT_NVMF_RDMA_IO, 0,
     145             :                                         SPDK_TRACE_ARG_TYPE_PTR, "qpair");
     146           0 :         spdk_trace_register_description("RDMA_REQ_EXECUTING",
     147             :                                         TRACE_RDMA_REQUEST_STATE_EXECUTING,
     148             :                                         OWNER_TYPE_NONE, OBJECT_NVMF_RDMA_IO, 0,
     149             :                                         SPDK_TRACE_ARG_TYPE_PTR, "qpair");
     150           0 :         spdk_trace_register_description("RDMA_REQ_EXECUTED",
     151             :                                         TRACE_RDMA_REQUEST_STATE_EXECUTED,
     152             :                                         OWNER_TYPE_NONE, OBJECT_NVMF_RDMA_IO, 0,
     153             :                                         SPDK_TRACE_ARG_TYPE_PTR, "qpair");
     154           0 :         spdk_trace_register_description("RDMA_REQ_RDY2COMPL_PEND",
     155             :                                         TRACE_RDMA_REQUEST_STATE_READY_TO_COMPLETE_PENDING,
     156             :                                         OWNER_TYPE_NONE, OBJECT_NVMF_RDMA_IO, 0,
     157             :                                         SPDK_TRACE_ARG_TYPE_PTR, "qpair");
     158           0 :         spdk_trace_register_description("RDMA_REQ_RDY_TO_COMPL",
     159             :                                         TRACE_RDMA_REQUEST_STATE_READY_TO_COMPLETE,
     160             :                                         OWNER_TYPE_NONE, OBJECT_NVMF_RDMA_IO, 0,
     161             :                                         SPDK_TRACE_ARG_TYPE_PTR, "qpair");
     162           0 :         spdk_trace_register_description("RDMA_REQ_COMPLETING_C2H",
     163             :                                         TRACE_RDMA_REQUEST_STATE_TRANSFERRING_CONTROLLER_TO_HOST,
     164             :                                         OWNER_TYPE_NONE, OBJECT_NVMF_RDMA_IO, 0,
     165             :                                         SPDK_TRACE_ARG_TYPE_PTR, "qpair");
     166           0 :         spdk_trace_register_description("RDMA_REQ_COMPLETING",
     167             :                                         TRACE_RDMA_REQUEST_STATE_COMPLETING,
     168             :                                         OWNER_TYPE_NONE, OBJECT_NVMF_RDMA_IO, 0,
     169             :                                         SPDK_TRACE_ARG_TYPE_PTR, "qpair");
     170             : 
     171           0 :         spdk_trace_register_description("RDMA_QP_CREATE", TRACE_RDMA_QP_CREATE,
     172             :                                         OWNER_TYPE_NONE, OBJECT_NONE, 0,
     173             :                                         SPDK_TRACE_ARG_TYPE_INT, "");
     174           0 :         spdk_trace_register_description("RDMA_IBV_ASYNC_EVENT", TRACE_RDMA_IBV_ASYNC_EVENT,
     175             :                                         OWNER_TYPE_NONE, OBJECT_NONE, 0,
     176             :                                         SPDK_TRACE_ARG_TYPE_INT, "type");
     177           0 :         spdk_trace_register_description("RDMA_CM_ASYNC_EVENT", TRACE_RDMA_CM_ASYNC_EVENT,
     178             :                                         OWNER_TYPE_NONE, OBJECT_NONE, 0,
     179             :                                         SPDK_TRACE_ARG_TYPE_INT, "type");
     180           0 :         spdk_trace_register_description("RDMA_QP_DISCONNECT", TRACE_RDMA_QP_DISCONNECT,
     181             :                                         OWNER_TYPE_NONE, OBJECT_NONE, 0,
     182             :                                         SPDK_TRACE_ARG_TYPE_INT, "");
     183           0 :         spdk_trace_register_description("RDMA_QP_DESTROY", TRACE_RDMA_QP_DESTROY,
     184             :                                         OWNER_TYPE_NONE, OBJECT_NONE, 0,
     185             :                                         SPDK_TRACE_ARG_TYPE_INT, "");
     186             : 
     187           0 :         spdk_trace_tpoint_register_relation(TRACE_BDEV_IO_START, OBJECT_NVMF_RDMA_IO, 1);
     188           0 :         spdk_trace_tpoint_register_relation(TRACE_BDEV_IO_DONE, OBJECT_NVMF_RDMA_IO, 0);
     189           0 : }
     190             : 
     191             : enum spdk_nvmf_rdma_wr_type {
     192             :         RDMA_WR_TYPE_RECV,
     193             :         RDMA_WR_TYPE_SEND,
     194             :         RDMA_WR_TYPE_DATA,
     195             : };
     196             : 
     197             : struct spdk_nvmf_rdma_wr {
     198             :         /* Uses enum spdk_nvmf_rdma_wr_type */
     199             :         uint8_t type;
     200             : };
     201             : 
     202             : /* This structure holds commands as they are received off the wire.
     203             :  * It must be dynamically paired with a full request object
     204             :  * (spdk_nvmf_rdma_request) to service a request. It is separate
     205             :  * from the request because RDMA does not appear to order
     206             :  * completions, so occasionally we'll get a new incoming
     207             :  * command when there aren't any free request objects.
     208             :  */
     209             : struct spdk_nvmf_rdma_recv {
     210             :         struct ibv_recv_wr                      wr;
     211             :         struct ibv_sge                          sgl[NVMF_DEFAULT_RX_SGE];
     212             : 
     213             :         struct spdk_nvmf_rdma_qpair             *qpair;
     214             : 
     215             :         /* In-capsule data buffer */
     216             :         uint8_t                                 *buf;
     217             : 
     218             :         struct spdk_nvmf_rdma_wr                rdma_wr;
     219             :         uint64_t                                receive_tsc;
     220             : 
     221             :         STAILQ_ENTRY(spdk_nvmf_rdma_recv)       link;
     222             : };
     223             : 
     224             : struct spdk_nvmf_rdma_request_data {
     225             :         struct ibv_send_wr              wr;
     226             :         struct ibv_sge                  sgl[SPDK_NVMF_MAX_SGL_ENTRIES];
     227             : };
     228             : 
     229             : struct spdk_nvmf_rdma_request {
     230             :         struct spdk_nvmf_request                req;
     231             : 
     232             :         bool                                    fused_failed;
     233             : 
     234             :         struct spdk_nvmf_rdma_wr                data_wr;
     235             :         struct spdk_nvmf_rdma_wr                rsp_wr;
     236             : 
     237             :         /* Uses enum spdk_nvmf_rdma_request_state */
     238             :         uint8_t                                 state;
     239             : 
     240             :         /* Data offset in req.iov */
     241             :         uint32_t                                offset;
     242             : 
     243             :         struct spdk_nvmf_rdma_recv              *recv;
     244             : 
     245             :         struct {
     246             :                 struct  ibv_send_wr             wr;
     247             :                 struct  ibv_sge                 sgl[NVMF_DEFAULT_RSP_SGE];
     248             :         } rsp;
     249             : 
     250             :         uint16_t                                iovpos;
     251             :         uint16_t                                num_outstanding_data_wr;
     252             :         /* Used to split Write IO with multi SGL payload */
     253             :         uint16_t                                num_remaining_data_wr;
     254             :         uint64_t                                receive_tsc;
     255             :         struct spdk_nvmf_rdma_request           *fused_pair;
     256             :         STAILQ_ENTRY(spdk_nvmf_rdma_request)    state_link;
     257             :         struct ibv_send_wr                      *remaining_tranfer_in_wrs;
     258             :         struct ibv_send_wr                      *transfer_wr;
     259             :         struct spdk_nvmf_rdma_request_data      data;
     260             : };
     261             : 
     262             : struct spdk_nvmf_rdma_resource_opts {
     263             :         struct spdk_nvmf_rdma_qpair     *qpair;
     264             :         /* qp points either to an ibv_qp object or an ibv_srq object depending on the value of shared. */
     265             :         void                            *qp;
     266             :         struct spdk_rdma_utils_mem_map  *map;
     267             :         uint32_t                        max_queue_depth;
     268             :         uint32_t                        in_capsule_data_size;
     269             :         bool                            shared;
     270             : };
     271             : 
     272             : struct spdk_nvmf_rdma_resources {
     273             :         /* Array of size "max_queue_depth" containing RDMA requests. */
     274             :         struct spdk_nvmf_rdma_request           *reqs;
     275             : 
     276             :         /* Array of size "max_queue_depth" containing RDMA recvs. */
     277             :         struct spdk_nvmf_rdma_recv              *recvs;
     278             : 
     279             :         /* Array of size "max_queue_depth" containing 64 byte capsules
     280             :          * used for receive.
     281             :          */
     282             :         union nvmf_h2c_msg                      *cmds;
     283             : 
     284             :         /* Array of size "max_queue_depth" containing 16 byte completions
     285             :          * to be sent back to the user.
     286             :          */
     287             :         union nvmf_c2h_msg                      *cpls;
     288             : 
     289             :         /* Array of size "max_queue_depth * InCapsuleDataSize" containing
     290             :          * buffers to be used for in capsule data.
     291             :          */
     292             :         void                                    *bufs;
     293             : 
     294             :         /* Receives that are waiting for a request object */
     295             :         STAILQ_HEAD(, spdk_nvmf_rdma_recv)      incoming_queue;
     296             : 
     297             :         /* Queue to track free requests */
     298             :         STAILQ_HEAD(, spdk_nvmf_rdma_request)   free_queue;
     299             : };
     300             : 
     301             : typedef void (*spdk_nvmf_rdma_qpair_ibv_event)(struct spdk_nvmf_rdma_qpair *rqpair);
     302             : 
     303             : typedef void (*spdk_poller_destroy_cb)(void *ctx);
     304             : 
     305             : struct spdk_nvmf_rdma_ibv_event_ctx {
     306             :         struct spdk_nvmf_rdma_qpair                     *rqpair;
     307             :         spdk_nvmf_rdma_qpair_ibv_event                  cb_fn;
     308             :         /* Link to other ibv events associated with this qpair */
     309             :         STAILQ_ENTRY(spdk_nvmf_rdma_ibv_event_ctx)      link;
     310             : };
     311             : 
     312             : struct spdk_nvmf_rdma_qpair {
     313             :         struct spdk_nvmf_qpair                  qpair;
     314             : 
     315             :         struct spdk_nvmf_rdma_device            *device;
     316             :         struct spdk_nvmf_rdma_poller            *poller;
     317             : 
     318             :         struct spdk_rdma_provider_qp            *rdma_qp;
     319             :         struct rdma_cm_id                       *cm_id;
     320             :         struct spdk_rdma_provider_srq           *srq;
     321             :         struct rdma_cm_id                       *listen_id;
     322             : 
     323             :         /* Cache the QP number to improve QP search by RB tree. */
     324             :         uint32_t                                qp_num;
     325             : 
     326             :         /* The maximum number of I/O outstanding on this connection at one time */
     327             :         uint16_t                                max_queue_depth;
     328             : 
     329             :         /* The maximum number of active RDMA READ and ATOMIC operations at one time */
     330             :         uint16_t                                max_read_depth;
     331             : 
     332             :         /* The maximum number of RDMA SEND operations at one time */
     333             :         uint32_t                                max_send_depth;
     334             : 
     335             :         /* The current number of outstanding WRs from this qpair's
     336             :          * recv queue. Should not exceed device->attr.max_queue_depth.
     337             :          */
     338             :         uint16_t                                current_recv_depth;
     339             : 
     340             :         /* The current number of active RDMA READ operations */
     341             :         uint16_t                                current_read_depth;
     342             : 
     343             :         /* The current number of posted WRs from this qpair's
     344             :          * send queue. Should not exceed max_send_depth.
     345             :          */
     346             :         uint32_t                                current_send_depth;
     347             : 
     348             :         /* The maximum number of SGEs per WR on the send queue */
     349             :         uint32_t                                max_send_sge;
     350             : 
     351             :         /* The maximum number of SGEs per WR on the recv queue */
     352             :         uint32_t                                max_recv_sge;
     353             : 
     354             :         struct spdk_nvmf_rdma_resources         *resources;
     355             : 
     356             :         STAILQ_HEAD(, spdk_nvmf_rdma_request)   pending_rdma_read_queue;
     357             : 
     358             :         STAILQ_HEAD(, spdk_nvmf_rdma_request)   pending_rdma_write_queue;
     359             : 
     360             :         STAILQ_HEAD(, spdk_nvmf_rdma_request)   pending_rdma_send_queue;
     361             : 
     362             :         /* Number of requests not in the free state */
     363             :         uint32_t                                qd;
     364             : 
     365             :         bool                                    ibv_in_error_state;
     366             : 
     367             :         RB_ENTRY(spdk_nvmf_rdma_qpair)          node;
     368             : 
     369             :         STAILQ_ENTRY(spdk_nvmf_rdma_qpair)      recv_link;
     370             : 
     371             :         STAILQ_ENTRY(spdk_nvmf_rdma_qpair)      send_link;
     372             : 
     373             :         /* Points to the a request that has fuse bits set to
     374             :          * SPDK_NVME_CMD_FUSE_FIRST, when the qpair is waiting
     375             :          * for the request that has SPDK_NVME_CMD_FUSE_SECOND.
     376             :          */
     377             :         struct spdk_nvmf_rdma_request           *fused_first;
     378             : 
     379             :         /*
     380             :          * io_channel which is used to destroy qpair when it is removed from poll group
     381             :          */
     382             :         struct spdk_io_channel          *destruct_channel;
     383             : 
     384             :         /* List of ibv async events */
     385             :         STAILQ_HEAD(, spdk_nvmf_rdma_ibv_event_ctx)     ibv_events;
     386             : 
     387             :         /* Lets us know that we have received the last_wqe event. */
     388             :         bool                                    last_wqe_reached;
     389             : 
     390             :         /* Indicate that nvmf_rdma_close_qpair is called */
     391             :         bool                                    to_close;
     392             : };
     393             : 
     394             : struct spdk_nvmf_rdma_poller_stat {
     395             :         uint64_t                                completions;
     396             :         uint64_t                                polls;
     397             :         uint64_t                                idle_polls;
     398             :         uint64_t                                requests;
     399             :         uint64_t                                request_latency;
     400             :         uint64_t                                pending_free_request;
     401             :         uint64_t                                pending_rdma_read;
     402             :         uint64_t                                pending_rdma_write;
     403             :         uint64_t                                pending_rdma_send;
     404             :         struct spdk_rdma_provider_qp_stats      qp_stats;
     405             : };
     406             : 
     407             : struct spdk_nvmf_rdma_poller {
     408             :         struct spdk_nvmf_rdma_device            *device;
     409             :         struct spdk_nvmf_rdma_poll_group        *group;
     410             : 
     411             :         int                                     num_cqe;
     412             :         int                                     required_num_wr;
     413             :         struct ibv_cq                           *cq;
     414             : 
     415             :         /* The maximum number of I/O outstanding on the shared receive queue at one time */
     416             :         uint16_t                                max_srq_depth;
     417             :         bool                                    need_destroy;
     418             : 
     419             :         /* Shared receive queue */
     420             :         struct spdk_rdma_provider_srq           *srq;
     421             : 
     422             :         struct spdk_nvmf_rdma_resources         *resources;
     423             :         struct spdk_nvmf_rdma_poller_stat       stat;
     424             : 
     425             :         spdk_poller_destroy_cb                  destroy_cb;
     426             :         void                                    *destroy_cb_ctx;
     427             : 
     428             :         RB_HEAD(qpairs_tree, spdk_nvmf_rdma_qpair) qpairs;
     429             : 
     430             :         STAILQ_HEAD(, spdk_nvmf_rdma_qpair)     qpairs_pending_recv;
     431             : 
     432             :         STAILQ_HEAD(, spdk_nvmf_rdma_qpair)     qpairs_pending_send;
     433             : 
     434             :         TAILQ_ENTRY(spdk_nvmf_rdma_poller)      link;
     435             : };
     436             : 
     437             : struct spdk_nvmf_rdma_poll_group_stat {
     438             :         uint64_t                                pending_data_buffer;
     439             : };
     440             : 
     441             : struct spdk_nvmf_rdma_poll_group {
     442             :         struct spdk_nvmf_transport_poll_group           group;
     443             :         struct spdk_nvmf_rdma_poll_group_stat           stat;
     444             :         TAILQ_HEAD(, spdk_nvmf_rdma_poller)             pollers;
     445             :         TAILQ_ENTRY(spdk_nvmf_rdma_poll_group)          link;
     446             : };
     447             : 
     448             : struct spdk_nvmf_rdma_conn_sched {
     449             :         struct spdk_nvmf_rdma_poll_group *next_admin_pg;
     450             :         struct spdk_nvmf_rdma_poll_group *next_io_pg;
     451             : };
     452             : 
     453             : /* Assuming rdma_cm uses just one protection domain per ibv_context. */
     454             : struct spdk_nvmf_rdma_device {
     455             :         struct ibv_device_attr                  attr;
     456             :         struct ibv_context                      *context;
     457             : 
     458             :         struct spdk_rdma_utils_mem_map          *map;
     459             :         struct ibv_pd                           *pd;
     460             : 
     461             :         int                                     num_srq;
     462             :         bool                                    need_destroy;
     463             :         bool                                    ready_to_destroy;
     464             :         bool                                    is_ready;
     465             : 
     466             :         TAILQ_ENTRY(spdk_nvmf_rdma_device)      link;
     467             : };
     468             : 
     469             : struct spdk_nvmf_rdma_port {
     470             :         const struct spdk_nvme_transport_id     *trid;
     471             :         struct rdma_cm_id                       *id;
     472             :         struct spdk_nvmf_rdma_device            *device;
     473             :         TAILQ_ENTRY(spdk_nvmf_rdma_port)        link;
     474             : };
     475             : 
     476             : struct rdma_transport_opts {
     477             :         int             num_cqe;
     478             :         uint32_t        max_srq_depth;
     479             :         bool            no_srq;
     480             :         bool            no_wr_batching;
     481             :         int             acceptor_backlog;
     482             : };
     483             : 
     484             : struct spdk_nvmf_rdma_transport {
     485             :         struct spdk_nvmf_transport      transport;
     486             :         struct rdma_transport_opts      rdma_opts;
     487             : 
     488             :         struct spdk_nvmf_rdma_conn_sched conn_sched;
     489             : 
     490             :         struct rdma_event_channel       *event_channel;
     491             : 
     492             :         struct spdk_mempool             *data_wr_pool;
     493             : 
     494             :         struct spdk_poller              *accept_poller;
     495             : 
     496             :         /* fields used to poll RDMA/IB events */
     497             :         nfds_t                  npoll_fds;
     498             :         struct pollfd           *poll_fds;
     499             : 
     500             :         TAILQ_HEAD(, spdk_nvmf_rdma_device)     devices;
     501             :         TAILQ_HEAD(, spdk_nvmf_rdma_port)       ports;
     502             :         TAILQ_HEAD(, spdk_nvmf_rdma_poll_group) poll_groups;
     503             : 
     504             :         /* ports that are removed unexpectedly and need retry listen */
     505             :         TAILQ_HEAD(, spdk_nvmf_rdma_port)               retry_ports;
     506             : };
     507             : 
     508             : struct poller_manage_ctx {
     509             :         struct spdk_nvmf_rdma_transport         *rtransport;
     510             :         struct spdk_nvmf_rdma_poll_group        *rgroup;
     511             :         struct spdk_nvmf_rdma_poller            *rpoller;
     512             :         struct spdk_nvmf_rdma_device            *device;
     513             : 
     514             :         struct spdk_thread                      *thread;
     515             :         volatile int                            *inflight_op_counter;
     516             : };
     517             : 
     518             : static const struct spdk_json_object_decoder rdma_transport_opts_decoder[] = {
     519             :         {
     520             :                 "num_cqe", offsetof(struct rdma_transport_opts, num_cqe),
     521             :                 spdk_json_decode_int32, true
     522             :         },
     523             :         {
     524             :                 "max_srq_depth", offsetof(struct rdma_transport_opts, max_srq_depth),
     525             :                 spdk_json_decode_uint32, true
     526             :         },
     527             :         {
     528             :                 "no_srq", offsetof(struct rdma_transport_opts, no_srq),
     529             :                 spdk_json_decode_bool, true
     530             :         },
     531             :         {
     532             :                 "no_wr_batching", offsetof(struct rdma_transport_opts, no_wr_batching),
     533             :                 spdk_json_decode_bool, true
     534             :         },
     535             :         {
     536             :                 "acceptor_backlog", offsetof(struct rdma_transport_opts, acceptor_backlog),
     537             :                 spdk_json_decode_int32, true
     538             :         },
     539             : };
     540             : 
     541             : static int
     542           2 : nvmf_rdma_qpair_compare(struct spdk_nvmf_rdma_qpair *rqpair1, struct spdk_nvmf_rdma_qpair *rqpair2)
     543             : {
     544           2 :         return rqpair1->qp_num < rqpair2->qp_num ? -1 : rqpair1->qp_num > rqpair2->qp_num;
     545             : }
     546             : 
     547           0 : RB_GENERATE_STATIC(qpairs_tree, spdk_nvmf_rdma_qpair, node, nvmf_rdma_qpair_compare);
     548             : 
     549             : static bool nvmf_rdma_request_process(struct spdk_nvmf_rdma_transport *rtransport,
     550             :                                       struct spdk_nvmf_rdma_request *rdma_req);
     551             : 
     552             : static void _poller_submit_sends(struct spdk_nvmf_rdma_transport *rtransport,
     553             :                                  struct spdk_nvmf_rdma_poller *rpoller);
     554             : 
     555             : static void _poller_submit_recvs(struct spdk_nvmf_rdma_transport *rtransport,
     556             :                                  struct spdk_nvmf_rdma_poller *rpoller);
     557             : 
     558             : static void _nvmf_rdma_remove_destroyed_device(void *c);
     559             : 
     560             : static inline enum spdk_nvme_media_error_status_code
     561           0 : nvmf_rdma_dif_error_to_compl_status(uint8_t err_type) {
     562             :         enum spdk_nvme_media_error_status_code result;
     563           0 :         switch (err_type)
     564             :         {
     565           0 :         case SPDK_DIF_REFTAG_ERROR:
     566           0 :                 result = SPDK_NVME_SC_REFERENCE_TAG_CHECK_ERROR;
     567           0 :                 break;
     568           0 :         case SPDK_DIF_APPTAG_ERROR:
     569           0 :                 result = SPDK_NVME_SC_APPLICATION_TAG_CHECK_ERROR;
     570           0 :                 break;
     571           0 :         case SPDK_DIF_GUARD_ERROR:
     572           0 :                 result = SPDK_NVME_SC_GUARD_CHECK_ERROR;
     573           0 :                 break;
     574           0 :         default:
     575           0 :                 SPDK_UNREACHABLE();
     576             :         }
     577             : 
     578           0 :         return result;
     579             : }
     580             : 
     581             : /*
     582             :  * Return data_wrs to pool starting from \b data_wr
     583             :  * Request's own response and data WR are excluded
     584             :  */
     585             : static void
     586           7 : _nvmf_rdma_request_free_data(struct spdk_nvmf_rdma_request *rdma_req,
     587             :                              struct ibv_send_wr *data_wr,
     588             :                              struct spdk_mempool *pool)
     589             : {
     590           7 :         struct spdk_nvmf_rdma_request_data      *work_requests[SPDK_NVMF_MAX_SGL_ENTRIES];
     591             :         struct spdk_nvmf_rdma_request_data      *nvmf_data;
     592             :         struct ibv_send_wr                      *next_send_wr;
     593           7 :         uint64_t                                req_wrid = (uint64_t)&rdma_req->data_wr;
     594           7 :         uint32_t                                num_wrs = 0;
     595             : 
     596          15 :         while (data_wr && data_wr->wr_id == req_wrid) {
     597           8 :                 nvmf_data = SPDK_CONTAINEROF(data_wr, struct spdk_nvmf_rdma_request_data, wr);
     598           8 :                 memset(nvmf_data->sgl, 0, sizeof(data_wr->sg_list[0]) * data_wr->num_sge);
     599           8 :                 data_wr->num_sge = 0;
     600           8 :                 next_send_wr = data_wr->next;
     601           8 :                 if (data_wr != &rdma_req->data.wr) {
     602           1 :                         data_wr->next = NULL;
     603           1 :                         assert(num_wrs < SPDK_NVMF_MAX_SGL_ENTRIES);
     604           1 :                         work_requests[num_wrs] = nvmf_data;
     605           1 :                         num_wrs++;
     606             :                 }
     607           8 :                 data_wr = (!next_send_wr || next_send_wr == &rdma_req->rsp.wr) ? NULL : next_send_wr;
     608             :         }
     609             : 
     610           7 :         if (num_wrs) {
     611           1 :                 spdk_mempool_put_bulk(pool, (void **) work_requests, num_wrs);
     612             :         }
     613           7 : }
     614             : 
     615             : static void
     616           7 : nvmf_rdma_request_free_data(struct spdk_nvmf_rdma_request *rdma_req,
     617             :                             struct spdk_nvmf_rdma_transport *rtransport)
     618             : {
     619           7 :         rdma_req->num_outstanding_data_wr = 0;
     620             : 
     621           7 :         _nvmf_rdma_request_free_data(rdma_req, rdma_req->transfer_wr, rtransport->data_wr_pool);
     622             : 
     623           7 :         if (rdma_req->remaining_tranfer_in_wrs) {
     624           0 :                 _nvmf_rdma_request_free_data(rdma_req, rdma_req->remaining_tranfer_in_wrs,
     625             :                                              rtransport->data_wr_pool);
     626           0 :                 rdma_req->remaining_tranfer_in_wrs = NULL;
     627             :         }
     628             : 
     629           7 :         rdma_req->data.wr.next = NULL;
     630           7 :         rdma_req->rsp.wr.next = NULL;
     631           7 : }
     632             : 
     633             : static void
     634           0 : nvmf_rdma_dump_request(struct spdk_nvmf_rdma_request *req)
     635             : {
     636           0 :         SPDK_ERRLOG("\t\tRequest Data From Pool: %d\n", req->req.data_from_pool);
     637           0 :         if (req->req.cmd) {
     638           0 :                 SPDK_ERRLOG("\t\tRequest opcode: %d\n", req->req.cmd->nvmf_cmd.opcode);
     639             :         }
     640           0 :         if (req->recv) {
     641           0 :                 SPDK_ERRLOG("\t\tRequest recv wr_id%lu\n", req->recv->wr.wr_id);
     642             :         }
     643           0 : }
     644             : 
     645             : static void
     646           0 : nvmf_rdma_dump_qpair_contents(struct spdk_nvmf_rdma_qpair *rqpair)
     647             : {
     648             :         int i;
     649             : 
     650           0 :         SPDK_ERRLOG("Dumping contents of queue pair (QID %d)\n", rqpair->qpair.qid);
     651           0 :         for (i = 0; i < rqpair->max_queue_depth; i++) {
     652           0 :                 if (rqpair->resources->reqs[i].state != RDMA_REQUEST_STATE_FREE) {
     653           0 :                         nvmf_rdma_dump_request(&rqpair->resources->reqs[i]);
     654             :                 }
     655             :         }
     656           0 : }
     657             : 
     658             : static void
     659           1 : nvmf_rdma_resources_destroy(struct spdk_nvmf_rdma_resources *resources)
     660             : {
     661           1 :         spdk_free(resources->cmds);
     662           1 :         spdk_free(resources->cpls);
     663           1 :         spdk_free(resources->bufs);
     664           1 :         spdk_free(resources->reqs);
     665           1 :         spdk_free(resources->recvs);
     666           1 :         free(resources);
     667           1 : }
     668             : 
     669             : 
     670             : static struct spdk_nvmf_rdma_resources *
     671           1 : nvmf_rdma_resources_create(struct spdk_nvmf_rdma_resource_opts *opts)
     672             : {
     673             :         struct spdk_nvmf_rdma_resources         *resources;
     674             :         struct spdk_nvmf_rdma_request           *rdma_req;
     675             :         struct spdk_nvmf_rdma_recv              *rdma_recv;
     676           1 :         struct spdk_rdma_provider_qp            *qp = NULL;
     677           1 :         struct spdk_rdma_provider_srq           *srq = NULL;
     678           1 :         struct ibv_recv_wr                      *bad_wr = NULL;
     679           1 :         struct spdk_rdma_utils_memory_translation translation;
     680             :         uint32_t                                i;
     681           1 :         int                                     rc = 0;
     682             : 
     683           1 :         resources = calloc(1, sizeof(struct spdk_nvmf_rdma_resources));
     684           1 :         if (!resources) {
     685           0 :                 SPDK_ERRLOG("Unable to allocate resources for receive queue.\n");
     686           0 :                 return NULL;
     687             :         }
     688             : 
     689           1 :         resources->reqs = spdk_zmalloc(opts->max_queue_depth * sizeof(*resources->reqs),
     690             :                                        0x1000, NULL, SPDK_ENV_LCORE_ID_ANY, SPDK_MALLOC_DMA);
     691           1 :         resources->recvs = spdk_zmalloc(opts->max_queue_depth * sizeof(*resources->recvs),
     692             :                                         0x1000, NULL, SPDK_ENV_LCORE_ID_ANY, SPDK_MALLOC_DMA);
     693           1 :         resources->cmds = spdk_zmalloc(opts->max_queue_depth * sizeof(*resources->cmds),
     694             :                                        0x1000, NULL, SPDK_ENV_LCORE_ID_ANY, SPDK_MALLOC_DMA);
     695           1 :         resources->cpls = spdk_zmalloc(opts->max_queue_depth * sizeof(*resources->cpls),
     696             :                                        0x1000, NULL, SPDK_ENV_LCORE_ID_ANY, SPDK_MALLOC_DMA);
     697             : 
     698           1 :         if (opts->in_capsule_data_size > 0) {
     699           1 :                 resources->bufs = spdk_zmalloc(opts->max_queue_depth * opts->in_capsule_data_size,
     700             :                                                0x1000, NULL, SPDK_ENV_LCORE_ID_ANY,
     701             :                                                SPDK_MALLOC_DMA);
     702             :         }
     703             : 
     704           1 :         if (!resources->reqs || !resources->recvs || !resources->cmds ||
     705           1 :             !resources->cpls || (opts->in_capsule_data_size && !resources->bufs)) {
     706           0 :                 SPDK_ERRLOG("Unable to allocate sufficient memory for RDMA queue.\n");
     707           0 :                 goto cleanup;
     708             :         }
     709             : 
     710           1 :         SPDK_DEBUGLOG(rdma, "Command Array: %p Length: %lx\n",
     711             :                       resources->cmds, opts->max_queue_depth * sizeof(*resources->cmds));
     712           1 :         SPDK_DEBUGLOG(rdma, "Completion Array: %p Length: %lx\n",
     713             :                       resources->cpls, opts->max_queue_depth * sizeof(*resources->cpls));
     714           1 :         if (resources->bufs) {
     715           1 :                 SPDK_DEBUGLOG(rdma, "In Capsule Data Array: %p Length: %x\n",
     716             :                               resources->bufs, opts->max_queue_depth *
     717             :                               opts->in_capsule_data_size);
     718             :         }
     719             : 
     720             :         /* Initialize queues */
     721           1 :         STAILQ_INIT(&resources->incoming_queue);
     722           1 :         STAILQ_INIT(&resources->free_queue);
     723             : 
     724           1 :         if (opts->shared) {
     725           1 :                 srq = (struct spdk_rdma_provider_srq *)opts->qp;
     726             :         } else {
     727           0 :                 qp = (struct spdk_rdma_provider_qp *)opts->qp;
     728             :         }
     729             : 
     730         129 :         for (i = 0; i < opts->max_queue_depth; i++) {
     731         128 :                 rdma_recv = &resources->recvs[i];
     732         128 :                 rdma_recv->qpair = opts->qpair;
     733             : 
     734             :                 /* Set up memory to receive commands */
     735         128 :                 if (resources->bufs) {
     736         128 :                         rdma_recv->buf = (void *)((uintptr_t)resources->bufs + (i *
     737         128 :                                                   opts->in_capsule_data_size));
     738             :                 }
     739             : 
     740         128 :                 rdma_recv->rdma_wr.type = RDMA_WR_TYPE_RECV;
     741             : 
     742         128 :                 rdma_recv->sgl[0].addr = (uintptr_t)&resources->cmds[i];
     743         128 :                 rdma_recv->sgl[0].length = sizeof(resources->cmds[i]);
     744         128 :                 rc = spdk_rdma_utils_get_translation(opts->map, &resources->cmds[i], sizeof(resources->cmds[i]),
     745             :                                                      &translation);
     746         128 :                 if (rc) {
     747           0 :                         goto cleanup;
     748             :                 }
     749         128 :                 rdma_recv->sgl[0].lkey = spdk_rdma_utils_memory_translation_get_lkey(&translation);
     750         128 :                 rdma_recv->wr.num_sge = 1;
     751             : 
     752         128 :                 if (rdma_recv->buf) {
     753         128 :                         rdma_recv->sgl[1].addr = (uintptr_t)rdma_recv->buf;
     754         128 :                         rdma_recv->sgl[1].length = opts->in_capsule_data_size;
     755         128 :                         rc = spdk_rdma_utils_get_translation(opts->map, rdma_recv->buf, opts->in_capsule_data_size,
     756             :                                                              &translation);
     757         128 :                         if (rc) {
     758           0 :                                 goto cleanup;
     759             :                         }
     760         128 :                         rdma_recv->sgl[1].lkey = spdk_rdma_utils_memory_translation_get_lkey(&translation);
     761         128 :                         rdma_recv->wr.num_sge++;
     762             :                 }
     763             : 
     764         128 :                 rdma_recv->wr.wr_id = (uintptr_t)&rdma_recv->rdma_wr;
     765         128 :                 rdma_recv->wr.sg_list = rdma_recv->sgl;
     766         128 :                 if (srq) {
     767           0 :                         spdk_rdma_provider_srq_queue_recv_wrs(srq, &rdma_recv->wr);
     768             :                 } else {
     769         128 :                         spdk_rdma_provider_qp_queue_recv_wrs(qp, &rdma_recv->wr);
     770             :                 }
     771             :         }
     772             : 
     773         129 :         for (i = 0; i < opts->max_queue_depth; i++) {
     774         128 :                 rdma_req = &resources->reqs[i];
     775             : 
     776         128 :                 if (opts->qpair != NULL) {
     777         128 :                         rdma_req->req.qpair = &opts->qpair->qpair;
     778             :                 } else {
     779           0 :                         rdma_req->req.qpair = NULL;
     780             :                 }
     781         128 :                 rdma_req->req.cmd = NULL;
     782         128 :                 rdma_req->req.iovcnt = 0;
     783         128 :                 rdma_req->req.stripped_data = NULL;
     784             : 
     785             :                 /* Set up memory to send responses */
     786         128 :                 rdma_req->req.rsp = &resources->cpls[i];
     787             : 
     788         128 :                 rdma_req->rsp.sgl[0].addr = (uintptr_t)&resources->cpls[i];
     789         128 :                 rdma_req->rsp.sgl[0].length = sizeof(resources->cpls[i]);
     790         128 :                 rc = spdk_rdma_utils_get_translation(opts->map, &resources->cpls[i], sizeof(resources->cpls[i]),
     791             :                                                      &translation);
     792         128 :                 if (rc) {
     793           0 :                         goto cleanup;
     794             :                 }
     795         128 :                 rdma_req->rsp.sgl[0].lkey = spdk_rdma_utils_memory_translation_get_lkey(&translation);
     796             : 
     797         128 :                 rdma_req->rsp_wr.type = RDMA_WR_TYPE_SEND;
     798         128 :                 rdma_req->rsp.wr.wr_id = (uintptr_t)&rdma_req->rsp_wr;
     799         128 :                 rdma_req->rsp.wr.next = NULL;
     800         128 :                 rdma_req->rsp.wr.opcode = IBV_WR_SEND;
     801         128 :                 rdma_req->rsp.wr.send_flags = IBV_SEND_SIGNALED;
     802         128 :                 rdma_req->rsp.wr.sg_list = rdma_req->rsp.sgl;
     803         128 :                 rdma_req->rsp.wr.num_sge = SPDK_COUNTOF(rdma_req->rsp.sgl);
     804             : 
     805             :                 /* Set up memory for data buffers */
     806         128 :                 rdma_req->data_wr.type = RDMA_WR_TYPE_DATA;
     807         128 :                 rdma_req->data.wr.wr_id = (uintptr_t)&rdma_req->data_wr;
     808         128 :                 rdma_req->data.wr.next = NULL;
     809         128 :                 rdma_req->data.wr.send_flags = IBV_SEND_SIGNALED;
     810         128 :                 rdma_req->data.wr.sg_list = rdma_req->data.sgl;
     811         128 :                 rdma_req->data.wr.num_sge = SPDK_COUNTOF(rdma_req->data.sgl);
     812             : 
     813             :                 /* Initialize request state to FREE */
     814         128 :                 rdma_req->state = RDMA_REQUEST_STATE_FREE;
     815         128 :                 STAILQ_INSERT_TAIL(&resources->free_queue, rdma_req, state_link);
     816             :         }
     817             : 
     818           1 :         if (srq) {
     819           0 :                 rc = spdk_rdma_provider_srq_flush_recv_wrs(srq, &bad_wr);
     820             :         } else {
     821           1 :                 rc = spdk_rdma_provider_qp_flush_recv_wrs(qp, &bad_wr);
     822             :         }
     823             : 
     824           1 :         if (rc) {
     825           0 :                 goto cleanup;
     826             :         }
     827             : 
     828           1 :         return resources;
     829             : 
     830           0 : cleanup:
     831           0 :         nvmf_rdma_resources_destroy(resources);
     832           0 :         return NULL;
     833             : }
     834             : 
     835             : static void
     836           0 : nvmf_rdma_qpair_clean_ibv_events(struct spdk_nvmf_rdma_qpair *rqpair)
     837             : {
     838             :         struct spdk_nvmf_rdma_ibv_event_ctx *ctx, *tctx;
     839           0 :         STAILQ_FOREACH_SAFE(ctx, &rqpair->ibv_events, link, tctx) {
     840           0 :                 ctx->rqpair = NULL;
     841             :                 /* Memory allocated for ctx is freed in nvmf_rdma_qpair_process_ibv_event */
     842           0 :                 STAILQ_REMOVE(&rqpair->ibv_events, ctx, spdk_nvmf_rdma_ibv_event_ctx, link);
     843             :         }
     844           0 : }
     845             : 
     846             : static void nvmf_rdma_poller_destroy(struct spdk_nvmf_rdma_poller *poller);
     847             : 
     848             : static void
     849           0 : nvmf_rdma_qpair_destroy(struct spdk_nvmf_rdma_qpair *rqpair)
     850             : {
     851             :         struct spdk_nvmf_rdma_recv      *rdma_recv, *recv_tmp;
     852           0 :         struct ibv_recv_wr              *bad_recv_wr = NULL;
     853             :         int                             rc;
     854             : 
     855           0 :         spdk_trace_record(TRACE_RDMA_QP_DESTROY, 0, 0, (uintptr_t)rqpair);
     856             : 
     857           0 :         if (rqpair->qd != 0) {
     858           0 :                 struct spdk_nvmf_qpair *qpair = &rqpair->qpair;
     859           0 :                 struct spdk_nvmf_rdma_transport *rtransport = SPDK_CONTAINEROF(qpair->transport,
     860             :                                 struct spdk_nvmf_rdma_transport, transport);
     861             :                 struct spdk_nvmf_rdma_request *req;
     862           0 :                 uint32_t i, max_req_count = 0;
     863             : 
     864           0 :                 SPDK_WARNLOG("Destroying qpair when queue depth is %d\n", rqpair->qd);
     865             : 
     866           0 :                 if (rqpair->srq == NULL) {
     867           0 :                         nvmf_rdma_dump_qpair_contents(rqpair);
     868           0 :                         max_req_count = rqpair->max_queue_depth;
     869           0 :                 } else if (rqpair->poller && rqpair->resources) {
     870           0 :                         max_req_count = rqpair->poller->max_srq_depth;
     871             :                 }
     872             : 
     873           0 :                 SPDK_DEBUGLOG(rdma, "Release incomplete requests\n");
     874           0 :                 for (i = 0; i < max_req_count; i++) {
     875           0 :                         req = &rqpair->resources->reqs[i];
     876           0 :                         if (req->req.qpair == qpair && req->state != RDMA_REQUEST_STATE_FREE) {
     877             :                                 /* nvmf_rdma_request_process checks qpair ibv and internal state
     878             :                                  * and completes a request */
     879           0 :                                 nvmf_rdma_request_process(rtransport, req);
     880             :                         }
     881             :                 }
     882           0 :                 assert(rqpair->qd == 0);
     883             :         }
     884             : 
     885           0 :         if (rqpair->poller) {
     886           0 :                 RB_REMOVE(qpairs_tree, &rqpair->poller->qpairs, rqpair);
     887             : 
     888           0 :                 if (rqpair->srq != NULL && rqpair->resources != NULL) {
     889             :                         /* Drop all received but unprocessed commands for this queue and return them to SRQ */
     890           0 :                         STAILQ_FOREACH_SAFE(rdma_recv, &rqpair->resources->incoming_queue, link, recv_tmp) {
     891           0 :                                 if (rqpair == rdma_recv->qpair) {
     892           0 :                                         STAILQ_REMOVE(&rqpair->resources->incoming_queue, rdma_recv, spdk_nvmf_rdma_recv, link);
     893           0 :                                         spdk_rdma_provider_srq_queue_recv_wrs(rqpair->srq, &rdma_recv->wr);
     894           0 :                                         rc = spdk_rdma_provider_srq_flush_recv_wrs(rqpair->srq, &bad_recv_wr);
     895           0 :                                         if (rc) {
     896           0 :                                                 SPDK_ERRLOG("Unable to re-post rx descriptor\n");
     897             :                                         }
     898             :                                 }
     899             :                         }
     900             :                 }
     901             :         }
     902             : 
     903           0 :         if (rqpair->cm_id) {
     904           0 :                 if (rqpair->rdma_qp != NULL) {
     905           0 :                         spdk_rdma_provider_qp_destroy(rqpair->rdma_qp);
     906           0 :                         rqpair->rdma_qp = NULL;
     907             :                 }
     908             : 
     909           0 :                 if (rqpair->poller != NULL && rqpair->srq == NULL) {
     910           0 :                         rqpair->poller->required_num_wr -= MAX_WR_PER_QP(rqpair->max_queue_depth);
     911             :                 }
     912             :         }
     913             : 
     914           0 :         if (rqpair->srq == NULL && rqpair->resources != NULL) {
     915           0 :                 nvmf_rdma_resources_destroy(rqpair->resources);
     916             :         }
     917             : 
     918           0 :         nvmf_rdma_qpair_clean_ibv_events(rqpair);
     919             : 
     920           0 :         if (rqpair->destruct_channel) {
     921           0 :                 spdk_put_io_channel(rqpair->destruct_channel);
     922           0 :                 rqpair->destruct_channel = NULL;
     923             :         }
     924             : 
     925           0 :         if (rqpair->poller && rqpair->poller->need_destroy && RB_EMPTY(&rqpair->poller->qpairs)) {
     926           0 :                 nvmf_rdma_poller_destroy(rqpair->poller);
     927             :         }
     928             : 
     929             :         /* destroy cm_id last so cma device will not be freed before we destroy the cq. */
     930           0 :         if (rqpair->cm_id) {
     931           0 :                 rdma_destroy_id(rqpair->cm_id);
     932             :         }
     933             : 
     934           0 :         free(rqpair);
     935           0 : }
     936             : 
     937             : static int
     938           5 : nvmf_rdma_resize_cq(struct spdk_nvmf_rdma_qpair *rqpair, struct spdk_nvmf_rdma_device *device)
     939             : {
     940             :         struct spdk_nvmf_rdma_poller    *rpoller;
     941             :         int                             rc, num_cqe, required_num_wr;
     942             : 
     943             :         /* Enlarge CQ size dynamically */
     944           5 :         rpoller = rqpair->poller;
     945           5 :         required_num_wr = rpoller->required_num_wr + MAX_WR_PER_QP(rqpair->max_queue_depth);
     946           5 :         num_cqe = rpoller->num_cqe;
     947           5 :         if (num_cqe < required_num_wr) {
     948           4 :                 num_cqe = spdk_max(num_cqe * 2, required_num_wr);
     949           4 :                 num_cqe = spdk_min(num_cqe, device->attr.max_cqe);
     950             :         }
     951             : 
     952           5 :         if (rpoller->num_cqe != num_cqe) {
     953           4 :                 if (device->context->device->transport_type == IBV_TRANSPORT_IWARP) {
     954           1 :                         SPDK_ERRLOG("iWARP doesn't support CQ resize. Current capacity %u, required %u\n"
     955             :                                     "Using CQ of insufficient size may lead to CQ overrun\n", rpoller->num_cqe, num_cqe);
     956           1 :                         return -1;
     957             :                 }
     958           3 :                 if (required_num_wr > device->attr.max_cqe) {
     959           1 :                         SPDK_ERRLOG("RDMA CQE requirement (%d) exceeds device max_cqe limitation (%d)\n",
     960             :                                     required_num_wr, device->attr.max_cqe);
     961           1 :                         return -1;
     962             :                 }
     963             : 
     964           2 :                 SPDK_DEBUGLOG(rdma, "Resize RDMA CQ from %d to %d\n", rpoller->num_cqe, num_cqe);
     965           2 :                 rc = ibv_resize_cq(rpoller->cq, num_cqe);
     966           2 :                 if (rc) {
     967           1 :                         SPDK_ERRLOG("RDMA CQ resize failed: errno %d: %s\n", errno, spdk_strerror(errno));
     968           1 :                         return -1;
     969             :                 }
     970             : 
     971           1 :                 rpoller->num_cqe = num_cqe;
     972             :         }
     973             : 
     974           2 :         rpoller->required_num_wr = required_num_wr;
     975           2 :         return 0;
     976             : }
     977             : 
     978             : static int
     979           0 : nvmf_rdma_qpair_initialize(struct spdk_nvmf_qpair *qpair)
     980             : {
     981             :         struct spdk_nvmf_rdma_qpair             *rqpair;
     982             :         struct spdk_nvmf_rdma_transport         *rtransport;
     983             :         struct spdk_nvmf_transport              *transport;
     984           0 :         struct spdk_nvmf_rdma_resource_opts     opts;
     985             :         struct spdk_nvmf_rdma_device            *device;
     986           0 :         struct spdk_rdma_provider_qp_init_attr  qp_init_attr = {};
     987             : 
     988           0 :         rqpair = SPDK_CONTAINEROF(qpair, struct spdk_nvmf_rdma_qpair, qpair);
     989           0 :         device = rqpair->device;
     990             : 
     991           0 :         qp_init_attr.qp_context = rqpair;
     992           0 :         qp_init_attr.pd         = device->pd;
     993           0 :         qp_init_attr.send_cq    = rqpair->poller->cq;
     994           0 :         qp_init_attr.recv_cq    = rqpair->poller->cq;
     995             : 
     996           0 :         if (rqpair->srq) {
     997           0 :                 qp_init_attr.srq                = rqpair->srq->srq;
     998             :         } else {
     999           0 :                 qp_init_attr.cap.max_recv_wr    = rqpair->max_queue_depth;
    1000             :         }
    1001             : 
    1002             :         /* SEND, READ, and WRITE operations */
    1003           0 :         qp_init_attr.cap.max_send_wr    = (uint32_t)rqpair->max_queue_depth * 2;
    1004           0 :         qp_init_attr.cap.max_send_sge   = spdk_min((uint32_t)device->attr.max_sge, NVMF_DEFAULT_TX_SGE);
    1005           0 :         qp_init_attr.cap.max_recv_sge   = spdk_min((uint32_t)device->attr.max_sge, NVMF_DEFAULT_RX_SGE);
    1006           0 :         qp_init_attr.stats              = &rqpair->poller->stat.qp_stats;
    1007             : 
    1008           0 :         if (rqpair->srq == NULL && nvmf_rdma_resize_cq(rqpair, device) < 0) {
    1009           0 :                 SPDK_ERRLOG("Failed to resize the completion queue. Cannot initialize qpair.\n");
    1010           0 :                 goto error;
    1011             :         }
    1012             : 
    1013           0 :         rqpair->rdma_qp = spdk_rdma_provider_qp_create(rqpair->cm_id, &qp_init_attr);
    1014           0 :         if (!rqpair->rdma_qp) {
    1015           0 :                 goto error;
    1016             :         }
    1017             : 
    1018           0 :         rqpair->qp_num = rqpair->rdma_qp->qp->qp_num;
    1019             : 
    1020           0 :         rqpair->max_send_depth = spdk_min((uint32_t)(rqpair->max_queue_depth * 2),
    1021             :                                           qp_init_attr.cap.max_send_wr);
    1022           0 :         rqpair->max_send_sge = spdk_min(NVMF_DEFAULT_TX_SGE, qp_init_attr.cap.max_send_sge);
    1023           0 :         rqpair->max_recv_sge = spdk_min(NVMF_DEFAULT_RX_SGE, qp_init_attr.cap.max_recv_sge);
    1024           0 :         spdk_trace_record(TRACE_RDMA_QP_CREATE, 0, 0, (uintptr_t)rqpair);
    1025           0 :         SPDK_DEBUGLOG(rdma, "New RDMA Connection: %p\n", qpair);
    1026             : 
    1027           0 :         if (rqpair->poller->srq == NULL) {
    1028           0 :                 rtransport = SPDK_CONTAINEROF(qpair->transport, struct spdk_nvmf_rdma_transport, transport);
    1029           0 :                 transport = &rtransport->transport;
    1030             : 
    1031           0 :                 opts.qp = rqpair->rdma_qp;
    1032           0 :                 opts.map = device->map;
    1033           0 :                 opts.qpair = rqpair;
    1034           0 :                 opts.shared = false;
    1035           0 :                 opts.max_queue_depth = rqpair->max_queue_depth;
    1036           0 :                 opts.in_capsule_data_size = transport->opts.in_capsule_data_size;
    1037             : 
    1038           0 :                 rqpair->resources = nvmf_rdma_resources_create(&opts);
    1039             : 
    1040           0 :                 if (!rqpair->resources) {
    1041           0 :                         SPDK_ERRLOG("Unable to allocate resources for receive queue.\n");
    1042           0 :                         rdma_destroy_qp(rqpair->cm_id);
    1043           0 :                         goto error;
    1044             :                 }
    1045             :         } else {
    1046           0 :                 rqpair->resources = rqpair->poller->resources;
    1047             :         }
    1048             : 
    1049           0 :         rqpair->current_recv_depth = 0;
    1050           0 :         STAILQ_INIT(&rqpair->pending_rdma_read_queue);
    1051           0 :         STAILQ_INIT(&rqpair->pending_rdma_write_queue);
    1052           0 :         STAILQ_INIT(&rqpair->pending_rdma_send_queue);
    1053           0 :         rqpair->qpair.queue_depth = 0;
    1054             : 
    1055           0 :         return 0;
    1056             : 
    1057           0 : error:
    1058           0 :         rdma_destroy_id(rqpair->cm_id);
    1059           0 :         rqpair->cm_id = NULL;
    1060           0 :         return -1;
    1061             : }
    1062             : 
    1063             : /* Append the given recv wr structure to the resource structs outstanding recvs list. */
    1064             : /* This function accepts either a single wr or the first wr in a linked list. */
    1065             : static void
    1066           6 : nvmf_rdma_qpair_queue_recv_wrs(struct spdk_nvmf_rdma_qpair *rqpair, struct ibv_recv_wr *first)
    1067             : {
    1068           6 :         struct spdk_nvmf_rdma_transport *rtransport = SPDK_CONTAINEROF(rqpair->qpair.transport,
    1069             :                         struct spdk_nvmf_rdma_transport, transport);
    1070             : 
    1071           6 :         if (rqpair->srq != NULL) {
    1072           0 :                 spdk_rdma_provider_srq_queue_recv_wrs(rqpair->srq, first);
    1073             :         } else {
    1074           6 :                 if (spdk_rdma_provider_qp_queue_recv_wrs(rqpair->rdma_qp, first)) {
    1075           6 :                         STAILQ_INSERT_TAIL(&rqpair->poller->qpairs_pending_recv, rqpair, recv_link);
    1076             :                 }
    1077             :         }
    1078             : 
    1079           6 :         if (rtransport->rdma_opts.no_wr_batching) {
    1080           0 :                 _poller_submit_recvs(rtransport, rqpair->poller);
    1081             :         }
    1082           6 : }
    1083             : 
    1084             : static int
    1085           4 : request_transfer_in(struct spdk_nvmf_request *req)
    1086             : {
    1087             :         struct spdk_nvmf_rdma_request   *rdma_req;
    1088             :         struct spdk_nvmf_qpair          *qpair;
    1089             :         struct spdk_nvmf_rdma_qpair     *rqpair;
    1090             :         struct spdk_nvmf_rdma_transport *rtransport;
    1091             : 
    1092           4 :         qpair = req->qpair;
    1093           4 :         rdma_req = SPDK_CONTAINEROF(req, struct spdk_nvmf_rdma_request, req);
    1094           4 :         rqpair = SPDK_CONTAINEROF(qpair, struct spdk_nvmf_rdma_qpair, qpair);
    1095           4 :         rtransport = SPDK_CONTAINEROF(rqpair->qpair.transport,
    1096             :                                       struct spdk_nvmf_rdma_transport, transport);
    1097             : 
    1098           4 :         assert(req->xfer == SPDK_NVME_DATA_HOST_TO_CONTROLLER);
    1099           4 :         assert(rdma_req != NULL);
    1100             : 
    1101           4 :         if (spdk_rdma_provider_qp_queue_send_wrs(rqpair->rdma_qp, rdma_req->transfer_wr)) {
    1102           4 :                 STAILQ_INSERT_TAIL(&rqpair->poller->qpairs_pending_send, rqpair, send_link);
    1103             :         }
    1104           4 :         if (rtransport->rdma_opts.no_wr_batching) {
    1105           0 :                 _poller_submit_sends(rtransport, rqpair->poller);
    1106             :         }
    1107             : 
    1108           4 :         assert(rqpair->current_read_depth + rdma_req->num_outstanding_data_wr <= rqpair->max_read_depth);
    1109           4 :         rqpair->current_read_depth += rdma_req->num_outstanding_data_wr;
    1110           4 :         assert(rqpair->current_send_depth + rdma_req->num_outstanding_data_wr <= rqpair->max_send_depth);
    1111           4 :         rqpair->current_send_depth += rdma_req->num_outstanding_data_wr;
    1112           4 :         return 0;
    1113             : }
    1114             : 
    1115             : static inline void
    1116           0 : nvmf_rdma_request_reset_transfer_in(struct spdk_nvmf_rdma_request *rdma_req,
    1117             :                                     struct spdk_nvmf_rdma_transport *rtransport)
    1118             : {
    1119             :         /* Put completed WRs back to pool and move transfer_wr pointer */
    1120           0 :         _nvmf_rdma_request_free_data(rdma_req, rdma_req->transfer_wr, rtransport->data_wr_pool);
    1121           0 :         rdma_req->transfer_wr = rdma_req->remaining_tranfer_in_wrs;
    1122           0 :         rdma_req->remaining_tranfer_in_wrs = NULL;
    1123           0 :         rdma_req->num_outstanding_data_wr = rdma_req->num_remaining_data_wr;
    1124           0 :         rdma_req->num_remaining_data_wr = 0;
    1125           0 : }
    1126             : 
    1127             : static inline int
    1128           0 : request_prepare_transfer_in_part(struct spdk_nvmf_request *req, uint32_t num_reads_available)
    1129             : {
    1130             :         struct spdk_nvmf_rdma_request   *rdma_req;
    1131             :         struct ibv_send_wr              *wr;
    1132             :         uint32_t i;
    1133             : 
    1134           0 :         rdma_req = SPDK_CONTAINEROF(req, struct spdk_nvmf_rdma_request, req);
    1135             : 
    1136           0 :         assert(req->xfer == SPDK_NVME_DATA_HOST_TO_CONTROLLER);
    1137           0 :         assert(rdma_req != NULL);
    1138           0 :         assert(num_reads_available > 0);
    1139           0 :         assert(rdma_req->num_outstanding_data_wr > num_reads_available);
    1140           0 :         wr = rdma_req->transfer_wr;
    1141             : 
    1142           0 :         for (i = 0; i < num_reads_available - 1; i++) {
    1143           0 :                 wr = wr->next;
    1144             :         }
    1145             : 
    1146           0 :         rdma_req->remaining_tranfer_in_wrs = wr->next;
    1147           0 :         rdma_req->num_remaining_data_wr = rdma_req->num_outstanding_data_wr - num_reads_available;
    1148           0 :         rdma_req->num_outstanding_data_wr = num_reads_available;
    1149             :         /* Break chain of WRs to send only part. Once this portion completes, we continue sending RDMA_READs */
    1150           0 :         wr->next = NULL;
    1151             : 
    1152           0 :         return 0;
    1153             : }
    1154             : 
    1155             : static int
    1156           6 : request_transfer_out(struct spdk_nvmf_request *req, int *data_posted)
    1157             : {
    1158           6 :         int                             num_outstanding_data_wr = 0;
    1159             :         struct spdk_nvmf_rdma_request   *rdma_req;
    1160             :         struct spdk_nvmf_qpair          *qpair;
    1161             :         struct spdk_nvmf_rdma_qpair     *rqpair;
    1162             :         struct spdk_nvme_cpl            *rsp;
    1163           6 :         struct ibv_send_wr              *first = NULL;
    1164             :         struct spdk_nvmf_rdma_transport *rtransport;
    1165             : 
    1166           6 :         *data_posted = 0;
    1167           6 :         qpair = req->qpair;
    1168           6 :         rsp = &req->rsp->nvme_cpl;
    1169           6 :         rdma_req = SPDK_CONTAINEROF(req, struct spdk_nvmf_rdma_request, req);
    1170           6 :         rqpair = SPDK_CONTAINEROF(qpair, struct spdk_nvmf_rdma_qpair, qpair);
    1171           6 :         rtransport = SPDK_CONTAINEROF(rqpair->qpair.transport,
    1172             :                                       struct spdk_nvmf_rdma_transport, transport);
    1173             : 
    1174             :         /* Advance our sq_head pointer */
    1175           6 :         if (qpair->sq_head == qpair->sq_head_max) {
    1176           6 :                 qpair->sq_head = 0;
    1177             :         } else {
    1178           0 :                 qpair->sq_head++;
    1179             :         }
    1180           6 :         rsp->sqhd = qpair->sq_head;
    1181             : 
    1182             :         /* queue the capsule for the recv buffer */
    1183           6 :         assert(rdma_req->recv != NULL);
    1184             : 
    1185           6 :         nvmf_rdma_qpair_queue_recv_wrs(rqpair, &rdma_req->recv->wr);
    1186             : 
    1187           6 :         rdma_req->recv = NULL;
    1188           6 :         assert(rqpair->current_recv_depth > 0);
    1189           6 :         rqpair->current_recv_depth--;
    1190             : 
    1191             :         /* Build the response which consists of optional
    1192             :          * RDMA WRITEs to transfer data, plus an RDMA SEND
    1193             :          * containing the response.
    1194             :          */
    1195           6 :         first = &rdma_req->rsp.wr;
    1196             : 
    1197           6 :         if (spdk_unlikely(rsp->status.sc != SPDK_NVME_SC_SUCCESS)) {
    1198             :                 /* On failure, data was not read from the controller. So clear the
    1199             :                  * number of outstanding data WRs to zero.
    1200             :                  */
    1201           1 :                 rdma_req->num_outstanding_data_wr = 0;
    1202           5 :         } else if (req->xfer == SPDK_NVME_DATA_CONTROLLER_TO_HOST) {
    1203           1 :                 first = rdma_req->transfer_wr;
    1204           1 :                 *data_posted = 1;
    1205           1 :                 num_outstanding_data_wr = rdma_req->num_outstanding_data_wr;
    1206             :         }
    1207           6 :         if (spdk_rdma_provider_qp_queue_send_wrs(rqpair->rdma_qp, first)) {
    1208           6 :                 STAILQ_INSERT_TAIL(&rqpair->poller->qpairs_pending_send, rqpair, send_link);
    1209             :         }
    1210           6 :         if (rtransport->rdma_opts.no_wr_batching) {
    1211           0 :                 _poller_submit_sends(rtransport, rqpair->poller);
    1212             :         }
    1213             : 
    1214             :         /* +1 for the rsp wr */
    1215           6 :         assert(rqpair->current_send_depth + num_outstanding_data_wr + 1 <= rqpair->max_send_depth);
    1216           6 :         rqpair->current_send_depth += num_outstanding_data_wr + 1;
    1217             : 
    1218           6 :         return 0;
    1219             : }
    1220             : 
    1221             : static int
    1222           0 : nvmf_rdma_event_accept(struct rdma_cm_id *id, struct spdk_nvmf_rdma_qpair *rqpair)
    1223             : {
    1224           0 :         struct spdk_nvmf_rdma_accept_private_data       accept_data;
    1225           0 :         struct rdma_conn_param                          ctrlr_event_data = {};
    1226             :         int                                             rc;
    1227             : 
    1228           0 :         accept_data.recfmt = 0;
    1229           0 :         accept_data.crqsize = rqpair->max_queue_depth;
    1230             : 
    1231           0 :         ctrlr_event_data.private_data = &accept_data;
    1232           0 :         ctrlr_event_data.private_data_len = sizeof(accept_data);
    1233           0 :         if (id->ps == RDMA_PS_TCP) {
    1234           0 :                 ctrlr_event_data.responder_resources = 0; /* We accept 0 reads from the host */
    1235           0 :                 ctrlr_event_data.initiator_depth = rqpair->max_read_depth;
    1236             :         }
    1237             : 
    1238             :         /* Configure infinite retries for the initiator side qpair.
    1239             :          * We need to pass this value to the initiator to prevent the
    1240             :          * initiator side NIC from completing SEND requests back to the
    1241             :          * initiator with status rnr_retry_count_exceeded. */
    1242           0 :         ctrlr_event_data.rnr_retry_count = 0x7;
    1243             : 
    1244             :         /* When qpair is created without use of rdma cm API, an additional
    1245             :          * information must be provided to initiator in the connection response:
    1246             :          * whether qpair is using SRQ and its qp_num
    1247             :          * Fields below are ignored by rdma cm if qpair has been
    1248             :          * created using rdma cm API. */
    1249           0 :         ctrlr_event_data.srq = rqpair->srq ? 1 : 0;
    1250           0 :         ctrlr_event_data.qp_num = rqpair->qp_num;
    1251             : 
    1252           0 :         rc = spdk_rdma_provider_qp_accept(rqpair->rdma_qp, &ctrlr_event_data);
    1253           0 :         if (rc) {
    1254           0 :                 SPDK_ERRLOG("Error %d on spdk_rdma_provider_qp_accept\n", errno);
    1255             :         } else {
    1256           0 :                 SPDK_DEBUGLOG(rdma, "Sent back the accept\n");
    1257             :         }
    1258             : 
    1259           0 :         return rc;
    1260             : }
    1261             : 
    1262             : static void
    1263           0 : nvmf_rdma_event_reject(struct rdma_cm_id *id, enum spdk_nvmf_rdma_transport_error error)
    1264             : {
    1265           0 :         struct spdk_nvmf_rdma_reject_private_data       rej_data;
    1266             : 
    1267           0 :         rej_data.recfmt = 0;
    1268           0 :         rej_data.sts = error;
    1269             : 
    1270           0 :         rdma_reject(id, &rej_data, sizeof(rej_data));
    1271           0 : }
    1272             : 
    1273             : static int
    1274           0 : nvmf_rdma_connect(struct spdk_nvmf_transport *transport, struct rdma_cm_event *event)
    1275             : {
    1276             :         struct spdk_nvmf_rdma_transport *rtransport;
    1277           0 :         struct spdk_nvmf_rdma_qpair     *rqpair = NULL;
    1278             :         struct spdk_nvmf_rdma_port      *port;
    1279           0 :         struct rdma_conn_param          *rdma_param = NULL;
    1280           0 :         const struct spdk_nvmf_rdma_request_private_data *private_data = NULL;
    1281             :         uint16_t                        max_queue_depth;
    1282             :         uint16_t                        max_read_depth;
    1283             : 
    1284           0 :         rtransport = SPDK_CONTAINEROF(transport, struct spdk_nvmf_rdma_transport, transport);
    1285             : 
    1286           0 :         assert(event->id != NULL); /* Impossible. Can't even reject the connection. */
    1287           0 :         assert(event->id->verbs != NULL); /* Impossible. No way to handle this. */
    1288             : 
    1289           0 :         rdma_param = &event->param.conn;
    1290           0 :         if (rdma_param->private_data == NULL ||
    1291           0 :             rdma_param->private_data_len < sizeof(struct spdk_nvmf_rdma_request_private_data)) {
    1292           0 :                 SPDK_ERRLOG("connect request: no private data provided\n");
    1293           0 :                 nvmf_rdma_event_reject(event->id, SPDK_NVMF_RDMA_ERROR_INVALID_PRIVATE_DATA_LENGTH);
    1294           0 :                 return -1;
    1295             :         }
    1296             : 
    1297           0 :         private_data = rdma_param->private_data;
    1298           0 :         if (private_data->recfmt != 0) {
    1299           0 :                 SPDK_ERRLOG("Received RDMA private data with RECFMT != 0\n");
    1300           0 :                 nvmf_rdma_event_reject(event->id, SPDK_NVMF_RDMA_ERROR_INVALID_RECFMT);
    1301           0 :                 return -1;
    1302             :         }
    1303             : 
    1304           0 :         SPDK_DEBUGLOG(rdma, "Connect Recv on fabric intf name %s, dev_name %s\n",
    1305             :                       event->id->verbs->device->name, event->id->verbs->device->dev_name);
    1306             : 
    1307           0 :         port = event->listen_id->context;
    1308           0 :         SPDK_DEBUGLOG(rdma, "Listen Id was %p with verbs %p. ListenAddr: %p\n",
    1309             :                       event->listen_id, event->listen_id->verbs, port);
    1310             : 
    1311             :         /* Figure out the supported queue depth. This is a multi-step process
    1312             :          * that takes into account hardware maximums, host provided values,
    1313             :          * and our target's internal memory limits */
    1314             : 
    1315           0 :         SPDK_DEBUGLOG(rdma, "Calculating Queue Depth\n");
    1316             : 
    1317             :         /* Start with the maximum queue depth allowed by the target */
    1318           0 :         max_queue_depth = rtransport->transport.opts.max_queue_depth;
    1319           0 :         max_read_depth = rtransport->transport.opts.max_queue_depth;
    1320           0 :         SPDK_DEBUGLOG(rdma, "Target Max Queue Depth: %d\n",
    1321             :                       rtransport->transport.opts.max_queue_depth);
    1322             : 
    1323             :         /* Next check the local NIC's hardware limitations */
    1324           0 :         SPDK_DEBUGLOG(rdma,
    1325             :                       "Local NIC Max Send/Recv Queue Depth: %d Max Read/Write Queue Depth: %d\n",
    1326             :                       port->device->attr.max_qp_wr, port->device->attr.max_qp_rd_atom);
    1327           0 :         max_queue_depth = spdk_min(max_queue_depth, port->device->attr.max_qp_wr);
    1328           0 :         max_read_depth = spdk_min(max_read_depth, port->device->attr.max_qp_init_rd_atom);
    1329             : 
    1330             :         /* Next check the remote NIC's hardware limitations */
    1331           0 :         SPDK_DEBUGLOG(rdma,
    1332             :                       "Host (Initiator) NIC Max Incoming RDMA R/W operations: %d Max Outgoing RDMA R/W operations: %d\n",
    1333             :                       rdma_param->initiator_depth, rdma_param->responder_resources);
    1334             :         /* from man3 rdma_get_cm_event
    1335             :          * responder_resources - Specifies the number of responder resources that is requested by the recipient.
    1336             :          * The responder_resources field must match the initiator depth specified by the remote node when running
    1337             :          * the rdma_connect and rdma_accept functions. */
    1338           0 :         if (rdma_param->responder_resources != 0) {
    1339           0 :                 if (private_data->qid) {
    1340           0 :                         SPDK_DEBUGLOG(rdma, "Host (Initiator) is not allowed to use RDMA operations,"
    1341             :                                       " responder_resources must be 0 but set to %u\n",
    1342             :                                       rdma_param->responder_resources);
    1343             :                 } else {
    1344           0 :                         SPDK_WARNLOG("Host (Initiator) is not allowed to use RDMA operations,"
    1345             :                                      " responder_resources must be 0 but set to %u\n",
    1346             :                                      rdma_param->responder_resources);
    1347             :                 }
    1348             :         }
    1349             :         /* from man3 rdma_get_cm_event
    1350             :          * initiator_depth - Specifies the maximum number of outstanding RDMA read operations that the recipient holds.
    1351             :          * The initiator_depth field must match the responder resources specified by the remote node when running
    1352             :          * the rdma_connect and rdma_accept functions. */
    1353           0 :         if (rdma_param->initiator_depth == 0) {
    1354           0 :                 SPDK_ERRLOG("Host (Initiator) doesn't support RDMA_READ or atomic operations\n");
    1355           0 :                 nvmf_rdma_event_reject(event->id, SPDK_NVMF_RDMA_ERROR_INVALID_IRD);
    1356           0 :                 return -1;
    1357             :         }
    1358           0 :         max_read_depth = spdk_min(max_read_depth, rdma_param->initiator_depth);
    1359             : 
    1360           0 :         SPDK_DEBUGLOG(rdma, "Host Receive Queue Size: %d\n", private_data->hrqsize);
    1361           0 :         SPDK_DEBUGLOG(rdma, "Host Send Queue Size: %d\n", private_data->hsqsize);
    1362           0 :         max_queue_depth = spdk_min(max_queue_depth, private_data->hrqsize);
    1363           0 :         max_queue_depth = spdk_min(max_queue_depth, private_data->hsqsize + 1);
    1364             : 
    1365           0 :         SPDK_DEBUGLOG(rdma, "Final Negotiated Queue Depth: %d R/W Depth: %d\n",
    1366             :                       max_queue_depth, max_read_depth);
    1367             : 
    1368           0 :         rqpair = calloc(1, sizeof(struct spdk_nvmf_rdma_qpair));
    1369           0 :         if (rqpair == NULL) {
    1370           0 :                 SPDK_ERRLOG("Could not allocate new connection.\n");
    1371           0 :                 nvmf_rdma_event_reject(event->id, SPDK_NVMF_RDMA_ERROR_NO_RESOURCES);
    1372           0 :                 return -1;
    1373             :         }
    1374             : 
    1375           0 :         rqpair->device = port->device;
    1376           0 :         rqpair->max_queue_depth = max_queue_depth;
    1377           0 :         rqpair->max_read_depth = max_read_depth;
    1378           0 :         rqpair->cm_id = event->id;
    1379           0 :         rqpair->listen_id = event->listen_id;
    1380           0 :         rqpair->qpair.transport = transport;
    1381           0 :         STAILQ_INIT(&rqpair->ibv_events);
    1382             :         /* use qid from the private data to determine the qpair type
    1383             :            qid will be set to the appropriate value when the controller is created */
    1384           0 :         rqpair->qpair.qid = private_data->qid;
    1385             : 
    1386           0 :         event->id->context = &rqpair->qpair;
    1387             : 
    1388           0 :         spdk_nvmf_tgt_new_qpair(transport->tgt, &rqpair->qpair);
    1389             : 
    1390           0 :         return 0;
    1391             : }
    1392             : 
    1393             : static inline void
    1394          28 : nvmf_rdma_setup_wr(struct ibv_send_wr *wr, struct ibv_send_wr *next,
    1395             :                    enum spdk_nvme_data_transfer xfer)
    1396             : {
    1397          28 :         if (xfer == SPDK_NVME_DATA_CONTROLLER_TO_HOST) {
    1398          24 :                 wr->opcode = IBV_WR_RDMA_WRITE;
    1399          24 :                 wr->send_flags = 0;
    1400          24 :                 wr->next = next;
    1401           4 :         } else if (xfer == SPDK_NVME_DATA_HOST_TO_CONTROLLER) {
    1402           4 :                 wr->opcode = IBV_WR_RDMA_READ;
    1403           4 :                 wr->send_flags = IBV_SEND_SIGNALED;
    1404           4 :                 wr->next = NULL;
    1405             :         } else {
    1406           0 :                 assert(0);
    1407             :         }
    1408          28 : }
    1409             : 
    1410             : static int
    1411           6 : nvmf_request_alloc_wrs(struct spdk_nvmf_rdma_transport *rtransport,
    1412             :                        struct spdk_nvmf_rdma_request *rdma_req,
    1413             :                        uint32_t num_sgl_descriptors)
    1414             : {
    1415           6 :         struct spdk_nvmf_rdma_request_data      *work_requests[SPDK_NVMF_MAX_SGL_ENTRIES];
    1416             :         struct spdk_nvmf_rdma_request_data      *current_data_wr;
    1417             :         uint32_t                                i;
    1418             : 
    1419           6 :         if (spdk_unlikely(num_sgl_descriptors > SPDK_NVMF_MAX_SGL_ENTRIES)) {
    1420           0 :                 SPDK_ERRLOG("Requested too much entries (%u), the limit is %u\n",
    1421             :                             num_sgl_descriptors, SPDK_NVMF_MAX_SGL_ENTRIES);
    1422           0 :                 return -EINVAL;
    1423             :         }
    1424             : 
    1425           6 :         if (spdk_unlikely(spdk_mempool_get_bulk(rtransport->data_wr_pool, (void **)work_requests,
    1426             :                                                 num_sgl_descriptors))) {
    1427           0 :                 return -ENOMEM;
    1428             :         }
    1429             : 
    1430           6 :         current_data_wr = &rdma_req->data;
    1431             : 
    1432          12 :         for (i = 0; i < num_sgl_descriptors; i++) {
    1433           6 :                 nvmf_rdma_setup_wr(&current_data_wr->wr, &work_requests[i]->wr, rdma_req->req.xfer);
    1434           6 :                 current_data_wr->wr.next = &work_requests[i]->wr;
    1435           6 :                 current_data_wr = work_requests[i];
    1436           6 :                 current_data_wr->wr.sg_list = current_data_wr->sgl;
    1437           6 :                 current_data_wr->wr.wr_id = rdma_req->data.wr.wr_id;
    1438             :         }
    1439             : 
    1440           6 :         nvmf_rdma_setup_wr(&current_data_wr->wr, &rdma_req->rsp.wr, rdma_req->req.xfer);
    1441             : 
    1442           6 :         return 0;
    1443             : }
    1444             : 
    1445             : static inline void
    1446          16 : nvmf_rdma_setup_request(struct spdk_nvmf_rdma_request *rdma_req)
    1447             : {
    1448          16 :         struct ibv_send_wr              *wr = &rdma_req->data.wr;
    1449          16 :         struct spdk_nvme_sgl_descriptor *sgl = &rdma_req->req.cmd->nvme_cmd.dptr.sgl1;
    1450             : 
    1451          16 :         wr->wr.rdma.rkey = sgl->keyed.key;
    1452          16 :         wr->wr.rdma.remote_addr = sgl->address;
    1453          16 :         nvmf_rdma_setup_wr(wr, &rdma_req->rsp.wr, rdma_req->req.xfer);
    1454          16 : }
    1455             : 
    1456             : static inline void
    1457           1 : nvmf_rdma_update_remote_addr(struct spdk_nvmf_rdma_request *rdma_req, uint32_t num_wrs)
    1458             : {
    1459           1 :         struct ibv_send_wr              *wr = &rdma_req->data.wr;
    1460           1 :         struct spdk_nvme_sgl_descriptor *sgl = &rdma_req->req.cmd->nvme_cmd.dptr.sgl1;
    1461             :         uint32_t                        i;
    1462             :         int                             j;
    1463           1 :         uint64_t                        remote_addr_offset = 0;
    1464             : 
    1465           3 :         for (i = 0; i < num_wrs; ++i) {
    1466           2 :                 wr->wr.rdma.rkey = sgl->keyed.key;
    1467           2 :                 wr->wr.rdma.remote_addr = sgl->address + remote_addr_offset;
    1468          19 :                 for (j = 0; j < wr->num_sge; ++j) {
    1469          17 :                         remote_addr_offset += wr->sg_list[j].length;
    1470             :                 }
    1471           2 :                 wr = wr->next;
    1472             :         }
    1473           1 : }
    1474             : 
    1475             : static int
    1476          15 : nvmf_rdma_fill_wr_sgl(struct spdk_nvmf_rdma_device *device,
    1477             :                       struct spdk_nvmf_rdma_request *rdma_req,
    1478             :                       struct ibv_send_wr *wr,
    1479             :                       uint32_t total_length)
    1480             : {
    1481          15 :         struct spdk_rdma_utils_memory_translation mem_translation;
    1482             :         struct ibv_sge  *sg_ele;
    1483             :         struct iovec *iov;
    1484             :         uint32_t lkey, remaining;
    1485             :         int rc;
    1486             : 
    1487          15 :         wr->num_sge = 0;
    1488             : 
    1489          74 :         while (total_length && wr->num_sge < SPDK_NVMF_MAX_SGL_ENTRIES) {
    1490          59 :                 iov = &rdma_req->req.iov[rdma_req->iovpos];
    1491          59 :                 rc = spdk_rdma_utils_get_translation(device->map, iov->iov_base, iov->iov_len, &mem_translation);
    1492          59 :                 if (spdk_unlikely(rc)) {
    1493           0 :                         return rc;
    1494             :                 }
    1495             : 
    1496          59 :                 lkey = spdk_rdma_utils_memory_translation_get_lkey(&mem_translation);
    1497          59 :                 sg_ele = &wr->sg_list[wr->num_sge];
    1498          59 :                 remaining = spdk_min((uint32_t)iov->iov_len - rdma_req->offset, total_length);
    1499             : 
    1500          59 :                 sg_ele->lkey = lkey;
    1501          59 :                 sg_ele->addr = (uintptr_t)iov->iov_base + rdma_req->offset;
    1502          59 :                 sg_ele->length = remaining;
    1503          59 :                 SPDK_DEBUGLOG(rdma, "sge[%d] %p addr 0x%"PRIx64", len %u\n", wr->num_sge, sg_ele, sg_ele->addr,
    1504             :                               sg_ele->length);
    1505          59 :                 rdma_req->offset += sg_ele->length;
    1506          59 :                 total_length -= sg_ele->length;
    1507          59 :                 wr->num_sge++;
    1508             : 
    1509          59 :                 if (rdma_req->offset == iov->iov_len) {
    1510          57 :                         rdma_req->offset = 0;
    1511          57 :                         rdma_req->iovpos++;
    1512             :                 }
    1513             :         }
    1514             : 
    1515          15 :         if (spdk_unlikely(total_length)) {
    1516           0 :                 SPDK_ERRLOG("Not enough SG entries to hold data buffer\n");
    1517           0 :                 return -EINVAL;
    1518             :         }
    1519             : 
    1520          15 :         return 0;
    1521             : }
    1522             : 
    1523             : static int
    1524          10 : nvmf_rdma_fill_wr_sgl_with_dif(struct spdk_nvmf_rdma_device *device,
    1525             :                                struct spdk_nvmf_rdma_request *rdma_req,
    1526             :                                struct ibv_send_wr *wr,
    1527             :                                uint32_t total_length,
    1528             :                                uint32_t num_extra_wrs)
    1529             : {
    1530          10 :         struct spdk_rdma_utils_memory_translation mem_translation;
    1531          10 :         struct spdk_dif_ctx *dif_ctx = &rdma_req->req.dif.dif_ctx;
    1532             :         struct ibv_sge *sg_ele;
    1533             :         struct iovec *iov;
    1534             :         struct iovec *rdma_iov;
    1535             :         uint32_t lkey, remaining;
    1536             :         uint32_t remaining_data_block, data_block_size, md_size;
    1537             :         uint32_t sge_len;
    1538             :         int rc;
    1539             : 
    1540          10 :         data_block_size = dif_ctx->block_size - dif_ctx->md_size;
    1541             : 
    1542          10 :         if (spdk_likely(!rdma_req->req.stripped_data)) {
    1543           5 :                 rdma_iov = rdma_req->req.iov;
    1544           5 :                 remaining_data_block = data_block_size;
    1545           5 :                 md_size = dif_ctx->md_size;
    1546             :         } else {
    1547           5 :                 rdma_iov = rdma_req->req.stripped_data->iov;
    1548           5 :                 total_length = total_length / dif_ctx->block_size * data_block_size;
    1549           5 :                 remaining_data_block = total_length;
    1550           5 :                 md_size = 0;
    1551             :         }
    1552             : 
    1553          10 :         wr->num_sge = 0;
    1554             : 
    1555          25 :         while (total_length && (num_extra_wrs || wr->num_sge < SPDK_NVMF_MAX_SGL_ENTRIES)) {
    1556          15 :                 iov = rdma_iov + rdma_req->iovpos;
    1557          15 :                 rc = spdk_rdma_utils_get_translation(device->map, iov->iov_base, iov->iov_len, &mem_translation);
    1558          15 :                 if (spdk_unlikely(rc)) {
    1559           0 :                         return rc;
    1560             :                 }
    1561             : 
    1562          15 :                 lkey = spdk_rdma_utils_memory_translation_get_lkey(&mem_translation);
    1563          15 :                 sg_ele = &wr->sg_list[wr->num_sge];
    1564          15 :                 remaining = spdk_min((uint32_t)iov->iov_len - rdma_req->offset, total_length);
    1565             : 
    1566          53 :                 while (remaining) {
    1567          38 :                         if (wr->num_sge >= SPDK_NVMF_MAX_SGL_ENTRIES) {
    1568           1 :                                 if (num_extra_wrs > 0 && wr->next) {
    1569           1 :                                         wr = wr->next;
    1570           1 :                                         wr->num_sge = 0;
    1571           1 :                                         sg_ele = &wr->sg_list[wr->num_sge];
    1572           1 :                                         num_extra_wrs--;
    1573             :                                 } else {
    1574             :                                         break;
    1575             :                                 }
    1576             :                         }
    1577          38 :                         sg_ele->lkey = lkey;
    1578          38 :                         sg_ele->addr = (uintptr_t)((char *)iov->iov_base + rdma_req->offset);
    1579          38 :                         sge_len = spdk_min(remaining, remaining_data_block);
    1580          38 :                         sg_ele->length = sge_len;
    1581          38 :                         SPDK_DEBUGLOG(rdma, "sge[%d] %p addr 0x%"PRIx64", len %u\n", wr->num_sge, sg_ele,
    1582             :                                       sg_ele->addr, sg_ele->length);
    1583          38 :                         remaining -= sge_len;
    1584          38 :                         remaining_data_block -= sge_len;
    1585          38 :                         rdma_req->offset += sge_len;
    1586          38 :                         total_length -= sge_len;
    1587             : 
    1588          38 :                         sg_ele++;
    1589          38 :                         wr->num_sge++;
    1590             : 
    1591          38 :                         if (remaining_data_block == 0) {
    1592             :                                 /* skip metadata */
    1593          34 :                                 rdma_req->offset += md_size;
    1594          34 :                                 total_length -= md_size;
    1595             :                                 /* Metadata that do not fit this IO buffer will be included in the next IO buffer */
    1596          34 :                                 remaining -= spdk_min(remaining, md_size);
    1597          34 :                                 remaining_data_block = data_block_size;
    1598             :                         }
    1599             : 
    1600          38 :                         if (remaining == 0) {
    1601             :                                 /* By subtracting the size of the last IOV from the offset, we ensure that we skip
    1602             :                                    the remaining metadata bits at the beginning of the next buffer */
    1603          15 :                                 rdma_req->offset -= spdk_min(iov->iov_len, rdma_req->offset);
    1604          15 :                                 rdma_req->iovpos++;
    1605             :                         }
    1606             :                 }
    1607             :         }
    1608             : 
    1609          10 :         if (spdk_unlikely(total_length)) {
    1610           0 :                 SPDK_ERRLOG("Not enough SG entries to hold data buffer\n");
    1611           0 :                 return -EINVAL;
    1612             :         }
    1613             : 
    1614          10 :         return 0;
    1615             : }
    1616             : 
    1617             : static inline uint32_t
    1618           8 : nvmf_rdma_calc_num_wrs(uint32_t length, uint32_t io_unit_size, uint32_t block_size)
    1619             : {
    1620             :         /* estimate the number of SG entries and WRs needed to process the request */
    1621           8 :         uint32_t num_sge = 0;
    1622             :         uint32_t i;
    1623           8 :         uint32_t num_buffers = SPDK_CEIL_DIV(length, io_unit_size);
    1624             : 
    1625          23 :         for (i = 0; i < num_buffers && length > 0; i++) {
    1626          15 :                 uint32_t buffer_len = spdk_min(length, io_unit_size);
    1627          15 :                 uint32_t num_sge_in_block = SPDK_CEIL_DIV(buffer_len, block_size);
    1628             : 
    1629          15 :                 if (num_sge_in_block * block_size > buffer_len) {
    1630          11 :                         ++num_sge_in_block;
    1631             :                 }
    1632          15 :                 num_sge += num_sge_in_block;
    1633          15 :                 length -= buffer_len;
    1634             :         }
    1635           8 :         return SPDK_CEIL_DIV(num_sge, SPDK_NVMF_MAX_SGL_ENTRIES);
    1636             : }
    1637             : 
    1638             : static int
    1639          16 : nvmf_rdma_request_fill_iovs(struct spdk_nvmf_rdma_transport *rtransport,
    1640             :                             struct spdk_nvmf_rdma_device *device,
    1641             :                             struct spdk_nvmf_rdma_request *rdma_req)
    1642             : {
    1643             :         struct spdk_nvmf_rdma_qpair             *rqpair;
    1644             :         struct spdk_nvmf_rdma_poll_group        *rgroup;
    1645          16 :         struct spdk_nvmf_request                *req = &rdma_req->req;
    1646          16 :         struct ibv_send_wr                      *wr = &rdma_req->data.wr;
    1647             :         int                                     rc;
    1648          16 :         uint32_t                                num_wrs = 1;
    1649             :         uint32_t                                length;
    1650             : 
    1651          16 :         rqpair = SPDK_CONTAINEROF(req->qpair, struct spdk_nvmf_rdma_qpair, qpair);
    1652          16 :         rgroup = rqpair->poller->group;
    1653             : 
    1654             :         /* rdma wr specifics */
    1655          16 :         nvmf_rdma_setup_request(rdma_req);
    1656             : 
    1657          16 :         length = req->length;
    1658          16 :         if (spdk_unlikely(req->dif_enabled)) {
    1659           8 :                 req->dif.orig_length = length;
    1660           8 :                 length = spdk_dif_get_length_with_md(length, &req->dif.dif_ctx);
    1661           8 :                 req->dif.elba_length = length;
    1662             :         }
    1663             : 
    1664          16 :         rc = spdk_nvmf_request_get_buffers(req, &rgroup->group, &rtransport->transport,
    1665             :                                            length);
    1666          16 :         if (spdk_unlikely(rc != 0)) {
    1667           1 :                 return rc;
    1668             :         }
    1669             : 
    1670          15 :         assert(req->iovcnt <= rqpair->max_send_sge);
    1671             : 
    1672             :         /* When dif_insert_or_strip is true and the I/O data length is greater than one block,
    1673             :          * the stripped_buffers are got for DIF stripping. */
    1674          15 :         if (spdk_unlikely(req->dif_enabled && (req->xfer == SPDK_NVME_DATA_CONTROLLER_TO_HOST)
    1675             :                           && (req->dif.elba_length > req->dif.dif_ctx.block_size))) {
    1676           7 :                 rc = nvmf_request_get_stripped_buffers(req, &rgroup->group,
    1677             :                                                        &rtransport->transport, req->dif.orig_length);
    1678           7 :                 if (rc != 0) {
    1679           4 :                         SPDK_INFOLOG(rdma, "Get stripped buffers fail %d, fallback to req.iov.\n", rc);
    1680             :                 }
    1681             :         }
    1682             : 
    1683          15 :         rdma_req->iovpos = 0;
    1684             : 
    1685          15 :         if (spdk_unlikely(req->dif_enabled)) {
    1686           8 :                 num_wrs = nvmf_rdma_calc_num_wrs(length, rtransport->transport.opts.io_unit_size,
    1687             :                                                  req->dif.dif_ctx.block_size);
    1688           8 :                 if (num_wrs > 1) {
    1689           1 :                         rc = nvmf_request_alloc_wrs(rtransport, rdma_req, num_wrs - 1);
    1690           1 :                         if (spdk_unlikely(rc != 0)) {
    1691           0 :                                 goto err_exit;
    1692             :                         }
    1693             :                 }
    1694             : 
    1695           8 :                 rc = nvmf_rdma_fill_wr_sgl_with_dif(device, rdma_req, wr, length, num_wrs - 1);
    1696           8 :                 if (spdk_unlikely(rc != 0)) {
    1697           0 :                         goto err_exit;
    1698             :                 }
    1699             : 
    1700           8 :                 if (num_wrs > 1) {
    1701           1 :                         nvmf_rdma_update_remote_addr(rdma_req, num_wrs);
    1702             :                 }
    1703             :         } else {
    1704           7 :                 rc = nvmf_rdma_fill_wr_sgl(device, rdma_req, wr, length);
    1705           7 :                 if (spdk_unlikely(rc != 0)) {
    1706           0 :                         goto err_exit;
    1707             :                 }
    1708             :         }
    1709             : 
    1710             :         /* set the number of outstanding data WRs for this request. */
    1711          15 :         rdma_req->num_outstanding_data_wr = num_wrs;
    1712             : 
    1713          15 :         return rc;
    1714             : 
    1715           0 : err_exit:
    1716           0 :         spdk_nvmf_request_free_buffers(req, &rgroup->group, &rtransport->transport);
    1717           0 :         nvmf_rdma_request_free_data(rdma_req, rtransport);
    1718           0 :         req->iovcnt = 0;
    1719           0 :         return rc;
    1720             : }
    1721             : 
    1722             : static int
    1723           5 : nvmf_rdma_request_fill_iovs_multi_sgl(struct spdk_nvmf_rdma_transport *rtransport,
    1724             :                                       struct spdk_nvmf_rdma_device *device,
    1725             :                                       struct spdk_nvmf_rdma_request *rdma_req)
    1726             : {
    1727             :         struct spdk_nvmf_rdma_qpair             *rqpair;
    1728             :         struct spdk_nvmf_rdma_poll_group        *rgroup;
    1729             :         struct ibv_send_wr                      *current_wr;
    1730           5 :         struct spdk_nvmf_request                *req = &rdma_req->req;
    1731             :         struct spdk_nvme_sgl_descriptor         *inline_segment, *desc;
    1732             :         uint32_t                                num_sgl_descriptors;
    1733           5 :         uint32_t                                lengths[SPDK_NVMF_MAX_SGL_ENTRIES], total_length = 0;
    1734             :         uint32_t                                i;
    1735             :         int                                     rc;
    1736             : 
    1737           5 :         rqpair = SPDK_CONTAINEROF(rdma_req->req.qpair, struct spdk_nvmf_rdma_qpair, qpair);
    1738           5 :         rgroup = rqpair->poller->group;
    1739             : 
    1740           5 :         inline_segment = &req->cmd->nvme_cmd.dptr.sgl1;
    1741           5 :         assert(inline_segment->generic.type == SPDK_NVME_SGL_TYPE_LAST_SEGMENT);
    1742           5 :         assert(inline_segment->unkeyed.subtype == SPDK_NVME_SGL_SUBTYPE_OFFSET);
    1743             : 
    1744           5 :         num_sgl_descriptors = inline_segment->unkeyed.length / sizeof(struct spdk_nvme_sgl_descriptor);
    1745           5 :         assert(num_sgl_descriptors <= SPDK_NVMF_MAX_SGL_ENTRIES);
    1746             : 
    1747           5 :         desc = (struct spdk_nvme_sgl_descriptor *)rdma_req->recv->buf + inline_segment->address;
    1748          15 :         for (i = 0; i < num_sgl_descriptors; i++) {
    1749          10 :                 if (spdk_likely(!req->dif_enabled)) {
    1750           8 :                         lengths[i] = desc->keyed.length;
    1751             :                 } else {
    1752           2 :                         req->dif.orig_length += desc->keyed.length;
    1753           2 :                         lengths[i] = spdk_dif_get_length_with_md(desc->keyed.length, &req->dif.dif_ctx);
    1754           2 :                         req->dif.elba_length += lengths[i];
    1755             :                 }
    1756          10 :                 total_length += lengths[i];
    1757          10 :                 desc++;
    1758             :         }
    1759             : 
    1760           5 :         if (spdk_unlikely(total_length > rtransport->transport.opts.max_io_size)) {
    1761           0 :                 SPDK_ERRLOG("Multi SGL length 0x%x exceeds max io size 0x%x\n",
    1762             :                             total_length, rtransport->transport.opts.max_io_size);
    1763           0 :                 req->rsp->nvme_cpl.status.sc = SPDK_NVME_SC_DATA_SGL_LENGTH_INVALID;
    1764           0 :                 return -EINVAL;
    1765             :         }
    1766             : 
    1767           5 :         rc = nvmf_request_alloc_wrs(rtransport, rdma_req, num_sgl_descriptors - 1);
    1768           5 :         if (spdk_unlikely(rc != 0)) {
    1769           0 :                 return -ENOMEM;
    1770             :         }
    1771             : 
    1772           5 :         rc = spdk_nvmf_request_get_buffers(req, &rgroup->group, &rtransport->transport, total_length);
    1773           5 :         if (spdk_unlikely(rc != 0)) {
    1774           0 :                 nvmf_rdma_request_free_data(rdma_req, rtransport);
    1775           0 :                 return rc;
    1776             :         }
    1777             : 
    1778             :         /* When dif_insert_or_strip is true and the I/O data length is greater than one block,
    1779             :          * the stripped_buffers are got for DIF stripping. */
    1780           5 :         if (spdk_unlikely(req->dif_enabled && (req->xfer == SPDK_NVME_DATA_CONTROLLER_TO_HOST)
    1781             :                           && (req->dif.elba_length > req->dif.dif_ctx.block_size))) {
    1782           1 :                 rc = nvmf_request_get_stripped_buffers(req, &rgroup->group,
    1783             :                                                        &rtransport->transport, req->dif.orig_length);
    1784           1 :                 if (spdk_unlikely(rc != 0)) {
    1785           0 :                         SPDK_INFOLOG(rdma, "Get stripped buffers fail %d, fallback to req.iov.\n", rc);
    1786             :                 }
    1787             :         }
    1788             : 
    1789             :         /* The first WR must always be the embedded data WR. This is how we unwind them later. */
    1790           5 :         current_wr = &rdma_req->data.wr;
    1791           5 :         assert(current_wr != NULL);
    1792             : 
    1793           5 :         req->length = 0;
    1794           5 :         rdma_req->iovpos = 0;
    1795           5 :         desc = (struct spdk_nvme_sgl_descriptor *)rdma_req->recv->buf + inline_segment->address;
    1796          15 :         for (i = 0; i < num_sgl_descriptors; i++) {
    1797             :                 /* The descriptors must be keyed data block descriptors with an address, not an offset. */
    1798          10 :                 if (spdk_unlikely(desc->generic.type != SPDK_NVME_SGL_TYPE_KEYED_DATA_BLOCK ||
    1799             :                                   desc->keyed.subtype != SPDK_NVME_SGL_SUBTYPE_ADDRESS)) {
    1800           0 :                         rc = -EINVAL;
    1801           0 :                         goto err_exit;
    1802             :                 }
    1803             : 
    1804          10 :                 if (spdk_likely(!req->dif_enabled)) {
    1805           8 :                         rc = nvmf_rdma_fill_wr_sgl(device, rdma_req, current_wr, lengths[i]);
    1806             :                 } else {
    1807           2 :                         rc = nvmf_rdma_fill_wr_sgl_with_dif(device, rdma_req, current_wr,
    1808             :                                                             lengths[i], 0);
    1809             :                 }
    1810          10 :                 if (spdk_unlikely(rc != 0)) {
    1811           0 :                         rc = -ENOMEM;
    1812           0 :                         goto err_exit;
    1813             :                 }
    1814             : 
    1815          10 :                 req->length += desc->keyed.length;
    1816          10 :                 current_wr->wr.rdma.rkey = desc->keyed.key;
    1817          10 :                 current_wr->wr.rdma.remote_addr = desc->address;
    1818          10 :                 current_wr = current_wr->next;
    1819          10 :                 desc++;
    1820             :         }
    1821             : 
    1822             : #ifdef SPDK_CONFIG_RDMA_SEND_WITH_INVAL
    1823             :         /* Go back to the last descriptor in the list. */
    1824           5 :         desc--;
    1825           5 :         if ((device->attr.device_cap_flags & IBV_DEVICE_MEM_MGT_EXTENSIONS) != 0) {
    1826           0 :                 if (desc->keyed.subtype == SPDK_NVME_SGL_SUBTYPE_INVALIDATE_KEY) {
    1827           0 :                         rdma_req->rsp.wr.opcode = IBV_WR_SEND_WITH_INV;
    1828           0 :                         rdma_req->rsp.wr.imm_data = desc->keyed.key;
    1829             :                 }
    1830             :         }
    1831             : #endif
    1832             : 
    1833           5 :         rdma_req->num_outstanding_data_wr = num_sgl_descriptors;
    1834             : 
    1835           5 :         return 0;
    1836             : 
    1837           0 : err_exit:
    1838           0 :         spdk_nvmf_request_free_buffers(req, &rgroup->group, &rtransport->transport);
    1839           0 :         nvmf_rdma_request_free_data(rdma_req, rtransport);
    1840           0 :         return rc;
    1841             : }
    1842             : 
    1843             : static int
    1844          25 : nvmf_rdma_request_parse_sgl(struct spdk_nvmf_rdma_transport *rtransport,
    1845             :                             struct spdk_nvmf_rdma_device *device,
    1846             :                             struct spdk_nvmf_rdma_request *rdma_req)
    1847             : {
    1848          25 :         struct spdk_nvmf_request                *req = &rdma_req->req;
    1849             :         struct spdk_nvme_cpl                    *rsp;
    1850             :         struct spdk_nvme_sgl_descriptor         *sgl;
    1851             :         int                                     rc;
    1852             :         uint32_t                                length;
    1853             : 
    1854          25 :         rsp = &req->rsp->nvme_cpl;
    1855          25 :         sgl = &req->cmd->nvme_cmd.dptr.sgl1;
    1856             : 
    1857          25 :         if (sgl->generic.type == SPDK_NVME_SGL_TYPE_KEYED_DATA_BLOCK &&
    1858          17 :             (sgl->keyed.subtype == SPDK_NVME_SGL_SUBTYPE_ADDRESS ||
    1859           0 :              sgl->keyed.subtype == SPDK_NVME_SGL_SUBTYPE_INVALIDATE_KEY)) {
    1860             : 
    1861          17 :                 length = sgl->keyed.length;
    1862          17 :                 if (spdk_unlikely(length > rtransport->transport.opts.max_io_size)) {
    1863           1 :                         SPDK_ERRLOG("SGL length 0x%x exceeds max io size 0x%x\n",
    1864             :                                     length, rtransport->transport.opts.max_io_size);
    1865           1 :                         rsp->status.sc = SPDK_NVME_SC_DATA_SGL_LENGTH_INVALID;
    1866           1 :                         return -1;
    1867             :                 }
    1868             : #ifdef SPDK_CONFIG_RDMA_SEND_WITH_INVAL
    1869          16 :                 if ((device->attr.device_cap_flags & IBV_DEVICE_MEM_MGT_EXTENSIONS) != 0) {
    1870           0 :                         if (sgl->keyed.subtype == SPDK_NVME_SGL_SUBTYPE_INVALIDATE_KEY) {
    1871           0 :                                 rdma_req->rsp.wr.opcode = IBV_WR_SEND_WITH_INV;
    1872           0 :                                 rdma_req->rsp.wr.imm_data = sgl->keyed.key;
    1873             :                         }
    1874             :                 }
    1875             : #endif
    1876             : 
    1877             :                 /* fill request length and populate iovs */
    1878          16 :                 req->length = length;
    1879             : 
    1880          16 :                 rc = nvmf_rdma_request_fill_iovs(rtransport, device, rdma_req);
    1881          16 :                 if (spdk_unlikely(rc < 0)) {
    1882           1 :                         if (rc == -EINVAL) {
    1883           0 :                                 SPDK_ERRLOG("SGL length exceeds the max I/O size\n");
    1884           0 :                                 rsp->status.sc = SPDK_NVME_SC_DATA_SGL_LENGTH_INVALID;
    1885           0 :                                 return -1;
    1886             :                         }
    1887             :                         /* No available buffers. Queue this request up. */
    1888           1 :                         SPDK_DEBUGLOG(rdma, "No available large data buffers. Queueing request %p\n", rdma_req);
    1889           1 :                         return 0;
    1890             :                 }
    1891             : 
    1892          15 :                 SPDK_DEBUGLOG(rdma, "Request %p took %d buffer/s from central pool\n", rdma_req,
    1893             :                               req->iovcnt);
    1894             : 
    1895          15 :                 return 0;
    1896           8 :         } else if (sgl->generic.type == SPDK_NVME_SGL_TYPE_DATA_BLOCK &&
    1897           3 :                    sgl->unkeyed.subtype == SPDK_NVME_SGL_SUBTYPE_OFFSET) {
    1898           3 :                 uint64_t offset = sgl->address;
    1899           3 :                 uint32_t max_len = rtransport->transport.opts.in_capsule_data_size;
    1900             : 
    1901           3 :                 SPDK_DEBUGLOG(nvmf, "In-capsule data: offset 0x%" PRIx64 ", length 0x%x\n",
    1902             :                               offset, sgl->unkeyed.length);
    1903             : 
    1904           3 :                 if (spdk_unlikely(offset > max_len)) {
    1905           0 :                         SPDK_ERRLOG("In-capsule offset 0x%" PRIx64 " exceeds capsule length 0x%x\n",
    1906             :                                     offset, max_len);
    1907           0 :                         rsp->status.sc = SPDK_NVME_SC_INVALID_SGL_OFFSET;
    1908           0 :                         return -1;
    1909             :                 }
    1910           3 :                 max_len -= (uint32_t)offset;
    1911             : 
    1912           3 :                 if (spdk_unlikely(sgl->unkeyed.length > max_len)) {
    1913           2 :                         SPDK_ERRLOG("In-capsule data length 0x%x exceeds capsule length 0x%x\n",
    1914             :                                     sgl->unkeyed.length, max_len);
    1915           2 :                         rsp->status.sc = SPDK_NVME_SC_DATA_SGL_LENGTH_INVALID;
    1916           2 :                         return -1;
    1917             :                 }
    1918             : 
    1919           1 :                 rdma_req->num_outstanding_data_wr = 0;
    1920           1 :                 req->data_from_pool = false;
    1921           1 :                 req->length = sgl->unkeyed.length;
    1922             : 
    1923           1 :                 req->iov[0].iov_base = rdma_req->recv->buf + offset;
    1924           1 :                 req->iov[0].iov_len = req->length;
    1925           1 :                 req->iovcnt = 1;
    1926             : 
    1927           1 :                 return 0;
    1928           5 :         } else if (sgl->generic.type == SPDK_NVME_SGL_TYPE_LAST_SEGMENT &&
    1929           5 :                    sgl->unkeyed.subtype == SPDK_NVME_SGL_SUBTYPE_OFFSET) {
    1930             : 
    1931           5 :                 rc = nvmf_rdma_request_fill_iovs_multi_sgl(rtransport, device, rdma_req);
    1932           5 :                 if (spdk_unlikely(rc == -ENOMEM)) {
    1933           0 :                         SPDK_DEBUGLOG(rdma, "No available large data buffers. Queueing request %p\n", rdma_req);
    1934           0 :                         return 0;
    1935           5 :                 } else if (spdk_unlikely(rc == -EINVAL)) {
    1936           0 :                         SPDK_ERRLOG("Multi SGL element request length exceeds the max I/O size\n");
    1937           0 :                         rsp->status.sc = SPDK_NVME_SC_DATA_SGL_LENGTH_INVALID;
    1938           0 :                         return -1;
    1939             :                 }
    1940             : 
    1941           5 :                 SPDK_DEBUGLOG(rdma, "Request %p took %d buffer/s from central pool\n", rdma_req,
    1942             :                               req->iovcnt);
    1943             : 
    1944           5 :                 return 0;
    1945             :         }
    1946             : 
    1947           0 :         SPDK_ERRLOG("Invalid NVMf I/O Command SGL:  Type 0x%x, Subtype 0x%x\n",
    1948             :                     sgl->generic.type, sgl->generic.subtype);
    1949           0 :         rsp->status.sc = SPDK_NVME_SC_SGL_DESCRIPTOR_TYPE_INVALID;
    1950           0 :         return -1;
    1951             : }
    1952             : 
    1953             : static void
    1954           6 : _nvmf_rdma_request_free(struct spdk_nvmf_rdma_request *rdma_req,
    1955             :                         struct spdk_nvmf_rdma_transport *rtransport)
    1956             : {
    1957             :         struct spdk_nvmf_rdma_qpair             *rqpair;
    1958             :         struct spdk_nvmf_rdma_poll_group        *rgroup;
    1959             : 
    1960           6 :         rqpair = SPDK_CONTAINEROF(rdma_req->req.qpair, struct spdk_nvmf_rdma_qpair, qpair);
    1961           6 :         if (rdma_req->req.data_from_pool) {
    1962           5 :                 rgroup = rqpair->poller->group;
    1963             : 
    1964           5 :                 spdk_nvmf_request_free_buffers(&rdma_req->req, &rgroup->group, &rtransport->transport);
    1965             :         }
    1966           6 :         if (rdma_req->req.stripped_data) {
    1967           0 :                 nvmf_request_free_stripped_buffers(&rdma_req->req,
    1968           0 :                                                    &rqpair->poller->group->group,
    1969             :                                                    &rtransport->transport);
    1970             :         }
    1971           6 :         nvmf_rdma_request_free_data(rdma_req, rtransport);
    1972           6 :         rdma_req->req.length = 0;
    1973           6 :         rdma_req->req.iovcnt = 0;
    1974           6 :         rdma_req->offset = 0;
    1975           6 :         rdma_req->req.dif_enabled = false;
    1976           6 :         rdma_req->fused_failed = false;
    1977           6 :         rdma_req->transfer_wr = NULL;
    1978           6 :         if (rdma_req->fused_pair) {
    1979             :                 /* This req was part of a valid fused pair, but failed before it got to
    1980             :                  * READ_TO_EXECUTE state.  This means we need to fail the other request
    1981             :                  * in the pair, because it is no longer part of a valid pair.  If the pair
    1982             :                  * already reached READY_TO_EXECUTE state, we need to kick it.
    1983             :                  */
    1984           0 :                 rdma_req->fused_pair->fused_failed = true;
    1985           0 :                 if (rdma_req->fused_pair->state == RDMA_REQUEST_STATE_READY_TO_EXECUTE) {
    1986           0 :                         nvmf_rdma_request_process(rtransport, rdma_req->fused_pair);
    1987             :                 }
    1988           0 :                 rdma_req->fused_pair = NULL;
    1989             :         }
    1990           6 :         memset(&rdma_req->req.dif, 0, sizeof(rdma_req->req.dif));
    1991           6 :         rqpair->qd--;
    1992             : 
    1993           6 :         STAILQ_INSERT_HEAD(&rqpair->resources->free_queue, rdma_req, state_link);
    1994           6 :         rqpair->qpair.queue_depth--;
    1995           6 :         rdma_req->state = RDMA_REQUEST_STATE_FREE;
    1996           6 : }
    1997             : 
    1998             : static void
    1999           6 : nvmf_rdma_check_fused_ordering(struct spdk_nvmf_rdma_transport *rtransport,
    2000             :                                struct spdk_nvmf_rdma_qpair *rqpair,
    2001             :                                struct spdk_nvmf_rdma_request *rdma_req)
    2002             : {
    2003             :         enum spdk_nvme_cmd_fuse last, next;
    2004             : 
    2005           6 :         last = rqpair->fused_first ? rqpair->fused_first->req.cmd->nvme_cmd.fuse : SPDK_NVME_CMD_FUSE_NONE;
    2006           6 :         next = rdma_req->req.cmd->nvme_cmd.fuse;
    2007             : 
    2008           6 :         assert(last != SPDK_NVME_CMD_FUSE_SECOND);
    2009             : 
    2010           6 :         if (spdk_likely(last == SPDK_NVME_CMD_FUSE_NONE && next == SPDK_NVME_CMD_FUSE_NONE)) {
    2011           6 :                 return;
    2012             :         }
    2013             : 
    2014           0 :         if (last == SPDK_NVME_CMD_FUSE_FIRST) {
    2015           0 :                 if (next == SPDK_NVME_CMD_FUSE_SECOND) {
    2016             :                         /* This is a valid pair of fused commands.  Point them at each other
    2017             :                          * so they can be submitted consecutively once ready to be executed.
    2018             :                          */
    2019           0 :                         rqpair->fused_first->fused_pair = rdma_req;
    2020           0 :                         rdma_req->fused_pair = rqpair->fused_first;
    2021           0 :                         rqpair->fused_first = NULL;
    2022           0 :                         return;
    2023             :                 } else {
    2024             :                         /* Mark the last req as failed since it wasn't followed by a SECOND. */
    2025           0 :                         rqpair->fused_first->fused_failed = true;
    2026             : 
    2027             :                         /* If the last req is in READY_TO_EXECUTE state, then call
    2028             :                          * nvmf_rdma_request_process(), otherwise nothing else will kick it.
    2029             :                          */
    2030           0 :                         if (rqpair->fused_first->state == RDMA_REQUEST_STATE_READY_TO_EXECUTE) {
    2031           0 :                                 nvmf_rdma_request_process(rtransport, rqpair->fused_first);
    2032             :                         }
    2033             : 
    2034           0 :                         rqpair->fused_first = NULL;
    2035             :                 }
    2036             :         }
    2037             : 
    2038           0 :         if (next == SPDK_NVME_CMD_FUSE_FIRST) {
    2039             :                 /* Set rqpair->fused_first here so that we know to check that the next request
    2040             :                  * is a SECOND (and to fail this one if it isn't).
    2041             :                  */
    2042           0 :                 rqpair->fused_first = rdma_req;
    2043           0 :         } else if (next == SPDK_NVME_CMD_FUSE_SECOND) {
    2044             :                 /* Mark this req failed since it ia SECOND and the last one was not a FIRST. */
    2045           0 :                 rdma_req->fused_failed = true;
    2046             :         }
    2047             : }
    2048             : 
    2049             : bool
    2050          23 : nvmf_rdma_request_process(struct spdk_nvmf_rdma_transport *rtransport,
    2051             :                           struct spdk_nvmf_rdma_request *rdma_req)
    2052             : {
    2053             :         struct spdk_nvmf_rdma_qpair     *rqpair;
    2054             :         struct spdk_nvmf_rdma_device    *device;
    2055             :         struct spdk_nvmf_rdma_poll_group *rgroup;
    2056          23 :         struct spdk_nvme_cpl            *rsp = &rdma_req->req.rsp->nvme_cpl;
    2057             :         int                             rc;
    2058             :         struct spdk_nvmf_rdma_recv      *rdma_recv;
    2059             :         enum spdk_nvmf_rdma_request_state prev_state;
    2060          23 :         bool                            progress = false;
    2061          23 :         int                             data_posted;
    2062             :         uint32_t                        num_blocks, num_rdma_reads_available, qdepth;
    2063             : 
    2064          23 :         rqpair = SPDK_CONTAINEROF(rdma_req->req.qpair, struct spdk_nvmf_rdma_qpair, qpair);
    2065          23 :         device = rqpair->device;
    2066          23 :         rgroup = rqpair->poller->group;
    2067             : 
    2068          23 :         assert(rdma_req->state != RDMA_REQUEST_STATE_FREE);
    2069             : 
    2070             :         /* If the queue pair is in an error state, force the request to the completed state
    2071             :          * to release resources. */
    2072          23 :         if (spdk_unlikely(rqpair->ibv_in_error_state || !spdk_nvmf_qpair_is_active(&rqpair->qpair))) {
    2073           0 :                 switch (rdma_req->state) {
    2074           0 :                 case RDMA_REQUEST_STATE_NEED_BUFFER:
    2075           0 :                         STAILQ_REMOVE(&rgroup->group.pending_buf_queue, &rdma_req->req, spdk_nvmf_request, buf_link);
    2076           0 :                         break;
    2077           0 :                 case RDMA_REQUEST_STATE_DATA_TRANSFER_TO_CONTROLLER_PENDING:
    2078           0 :                         STAILQ_REMOVE(&rqpair->pending_rdma_read_queue, rdma_req, spdk_nvmf_rdma_request, state_link);
    2079           0 :                         break;
    2080           0 :                 case RDMA_REQUEST_STATE_DATA_TRANSFER_TO_HOST_PENDING:
    2081           0 :                         STAILQ_REMOVE(&rqpair->pending_rdma_write_queue, rdma_req, spdk_nvmf_rdma_request, state_link);
    2082           0 :                         break;
    2083           0 :                 case RDMA_REQUEST_STATE_READY_TO_COMPLETE_PENDING:
    2084           0 :                         STAILQ_REMOVE(&rqpair->pending_rdma_send_queue, rdma_req, spdk_nvmf_rdma_request, state_link);
    2085           0 :                         break;
    2086           0 :                 default:
    2087           0 :                         break;
    2088             :                 }
    2089           0 :                 rdma_req->state = RDMA_REQUEST_STATE_COMPLETED;
    2090             :         }
    2091             : 
    2092             :         /* The loop here is to allow for several back-to-back state changes. */
    2093             :         do {
    2094          66 :                 prev_state = rdma_req->state;
    2095             : 
    2096          66 :                 SPDK_DEBUGLOG(rdma, "Request %p entering state %d\n", rdma_req, prev_state);
    2097             : 
    2098          66 :                 switch (rdma_req->state) {
    2099           6 :                 case RDMA_REQUEST_STATE_FREE:
    2100             :                         /* Some external code must kick a request into RDMA_REQUEST_STATE_NEW
    2101             :                          * to escape this state. */
    2102           6 :                         break;
    2103           6 :                 case RDMA_REQUEST_STATE_NEW:
    2104           6 :                         spdk_trace_record(TRACE_RDMA_REQUEST_STATE_NEW, 0, 0,
    2105             :                                           (uintptr_t)rdma_req, (uintptr_t)rqpair, rqpair->qpair.queue_depth);
    2106           6 :                         rdma_recv = rdma_req->recv;
    2107             : 
    2108             :                         /* The first element of the SGL is the NVMe command */
    2109           6 :                         rdma_req->req.cmd = (union nvmf_h2c_msg *)rdma_recv->sgl[0].addr;
    2110           6 :                         memset(rdma_req->req.rsp, 0, sizeof(*rdma_req->req.rsp));
    2111           6 :                         rdma_req->transfer_wr = &rdma_req->data.wr;
    2112             : 
    2113           6 :                         if (spdk_unlikely(rqpair->ibv_in_error_state || !spdk_nvmf_qpair_is_active(&rqpair->qpair))) {
    2114           0 :                                 rdma_req->state = RDMA_REQUEST_STATE_COMPLETED;
    2115           0 :                                 break;
    2116             :                         }
    2117             : 
    2118           6 :                         if (spdk_unlikely(spdk_nvmf_request_get_dif_ctx(&rdma_req->req, &rdma_req->req.dif.dif_ctx))) {
    2119           0 :                                 rdma_req->req.dif_enabled = true;
    2120             :                         }
    2121             : 
    2122           6 :                         nvmf_rdma_check_fused_ordering(rtransport, rqpair, rdma_req);
    2123             : 
    2124             : #ifdef SPDK_CONFIG_RDMA_SEND_WITH_INVAL
    2125           6 :                         rdma_req->rsp.wr.opcode = IBV_WR_SEND;
    2126           6 :                         rdma_req->rsp.wr.imm_data = 0;
    2127             : #endif
    2128             : 
    2129             :                         /* The next state transition depends on the data transfer needs of this request. */
    2130           6 :                         rdma_req->req.xfer = spdk_nvmf_req_get_xfer(&rdma_req->req);
    2131             : 
    2132           6 :                         if (spdk_unlikely(rdma_req->req.xfer == SPDK_NVME_DATA_BIDIRECTIONAL)) {
    2133           1 :                                 rsp->status.sct = SPDK_NVME_SCT_GENERIC;
    2134           1 :                                 rsp->status.sc = SPDK_NVME_SC_INVALID_OPCODE;
    2135           1 :                                 STAILQ_INSERT_TAIL(&rqpair->pending_rdma_send_queue, rdma_req, state_link);
    2136           1 :                                 rdma_req->state = RDMA_REQUEST_STATE_READY_TO_COMPLETE_PENDING;
    2137           1 :                                 SPDK_DEBUGLOG(rdma, "Request %p: invalid xfer type (BIDIRECTIONAL)\n", rdma_req);
    2138           1 :                                 break;
    2139             :                         }
    2140             : 
    2141             :                         /* If no data to transfer, ready to execute. */
    2142           5 :                         if (rdma_req->req.xfer == SPDK_NVME_DATA_NONE) {
    2143           0 :                                 rdma_req->state = RDMA_REQUEST_STATE_READY_TO_EXECUTE;
    2144           0 :                                 break;
    2145             :                         }
    2146             : 
    2147           5 :                         rdma_req->state = RDMA_REQUEST_STATE_NEED_BUFFER;
    2148           5 :                         STAILQ_INSERT_TAIL(&rgroup->group.pending_buf_queue, &rdma_req->req, buf_link);
    2149           5 :                         break;
    2150           5 :                 case RDMA_REQUEST_STATE_NEED_BUFFER:
    2151           5 :                         spdk_trace_record(TRACE_RDMA_REQUEST_STATE_NEED_BUFFER, 0, 0,
    2152             :                                           (uintptr_t)rdma_req, (uintptr_t)rqpair);
    2153             : 
    2154           5 :                         assert(rdma_req->req.xfer != SPDK_NVME_DATA_NONE);
    2155             : 
    2156           5 :                         if (&rdma_req->req != STAILQ_FIRST(&rgroup->group.pending_buf_queue)) {
    2157             :                                 /* This request needs to wait in line to obtain a buffer */
    2158           0 :                                 break;
    2159             :                         }
    2160             : 
    2161             :                         /* Try to get a data buffer */
    2162           5 :                         rc = nvmf_rdma_request_parse_sgl(rtransport, device, rdma_req);
    2163           5 :                         if (spdk_unlikely(rc < 0)) {
    2164           0 :                                 STAILQ_REMOVE_HEAD(&rgroup->group.pending_buf_queue, buf_link);
    2165           0 :                                 STAILQ_INSERT_TAIL(&rqpair->pending_rdma_send_queue, rdma_req, state_link);
    2166           0 :                                 rdma_req->state = RDMA_REQUEST_STATE_READY_TO_COMPLETE_PENDING;
    2167           0 :                                 break;
    2168             :                         }
    2169             : 
    2170           5 :                         if (rdma_req->req.iovcnt == 0) {
    2171             :                                 /* No buffers available. */
    2172           0 :                                 rgroup->stat.pending_data_buffer++;
    2173           0 :                                 break;
    2174             :                         }
    2175             : 
    2176           5 :                         STAILQ_REMOVE_HEAD(&rgroup->group.pending_buf_queue, buf_link);
    2177             : 
    2178             :                         /* If data is transferring from host to controller and the data didn't
    2179             :                          * arrive using in capsule data, we need to do a transfer from the host.
    2180             :                          */
    2181           5 :                         if (rdma_req->req.xfer == SPDK_NVME_DATA_HOST_TO_CONTROLLER &&
    2182             :                             rdma_req->req.data_from_pool) {
    2183           4 :                                 STAILQ_INSERT_TAIL(&rqpair->pending_rdma_read_queue, rdma_req, state_link);
    2184           4 :                                 rdma_req->state = RDMA_REQUEST_STATE_DATA_TRANSFER_TO_CONTROLLER_PENDING;
    2185           4 :                                 break;
    2186             :                         }
    2187             : 
    2188           1 :                         rdma_req->state = RDMA_REQUEST_STATE_READY_TO_EXECUTE;
    2189           1 :                         break;
    2190           4 :                 case RDMA_REQUEST_STATE_DATA_TRANSFER_TO_CONTROLLER_PENDING:
    2191           4 :                         spdk_trace_record(TRACE_RDMA_REQUEST_STATE_DATA_TRANSFER_TO_CONTROLLER_PENDING, 0, 0,
    2192             :                                           (uintptr_t)rdma_req, (uintptr_t)rqpair);
    2193             : 
    2194           4 :                         if (rdma_req != STAILQ_FIRST(&rqpair->pending_rdma_read_queue)) {
    2195             :                                 /* This request needs to wait in line to perform RDMA */
    2196           0 :                                 break;
    2197             :                         }
    2198           4 :                         assert(rqpair->max_send_depth >= rqpair->current_send_depth);
    2199           4 :                         qdepth = rqpair->max_send_depth - rqpair->current_send_depth;
    2200           4 :                         assert(rqpair->max_read_depth >= rqpair->current_read_depth);
    2201           4 :                         num_rdma_reads_available = rqpair->max_read_depth - rqpair->current_read_depth;
    2202           4 :                         if (rdma_req->num_outstanding_data_wr > qdepth ||
    2203           4 :                             rdma_req->num_outstanding_data_wr > num_rdma_reads_available) {
    2204           0 :                                 if (num_rdma_reads_available && qdepth) {
    2205             :                                         /* Send as much as we can */
    2206           0 :                                         request_prepare_transfer_in_part(&rdma_req->req, spdk_min(num_rdma_reads_available, qdepth));
    2207             :                                 } else {
    2208             :                                         /* We can only have so many WRs outstanding. we have to wait until some finish. */
    2209           0 :                                         rqpair->poller->stat.pending_rdma_read++;
    2210           0 :                                         break;
    2211             :                                 }
    2212             :                         }
    2213             : 
    2214             :                         /* We have already verified that this request is the head of the queue. */
    2215           4 :                         if (rdma_req->num_remaining_data_wr == 0) {
    2216           4 :                                 STAILQ_REMOVE_HEAD(&rqpair->pending_rdma_read_queue, state_link);
    2217             :                         }
    2218             : 
    2219           4 :                         rc = request_transfer_in(&rdma_req->req);
    2220           4 :                         if (spdk_likely(rc == 0)) {
    2221           4 :                                 rdma_req->state = RDMA_REQUEST_STATE_TRANSFERRING_HOST_TO_CONTROLLER;
    2222             :                         } else {
    2223           0 :                                 rsp->status.sc = SPDK_NVME_SC_INTERNAL_DEVICE_ERROR;
    2224           0 :                                 STAILQ_INSERT_TAIL(&rqpair->pending_rdma_send_queue, rdma_req, state_link);
    2225           0 :                                 rdma_req->state = RDMA_REQUEST_STATE_READY_TO_COMPLETE_PENDING;
    2226             :                         }
    2227           4 :                         break;
    2228           4 :                 case RDMA_REQUEST_STATE_TRANSFERRING_HOST_TO_CONTROLLER:
    2229           4 :                         spdk_trace_record(TRACE_RDMA_REQUEST_STATE_TRANSFERRING_HOST_TO_CONTROLLER, 0, 0,
    2230             :                                           (uintptr_t)rdma_req, (uintptr_t)rqpair);
    2231             :                         /* Some external code must kick a request into RDMA_REQUEST_STATE_READY_TO_EXECUTE
    2232             :                          * to escape this state. */
    2233           4 :                         break;
    2234           5 :                 case RDMA_REQUEST_STATE_READY_TO_EXECUTE:
    2235           5 :                         spdk_trace_record(TRACE_RDMA_REQUEST_STATE_READY_TO_EXECUTE, 0, 0,
    2236             :                                           (uintptr_t)rdma_req, (uintptr_t)rqpair);
    2237             : 
    2238           5 :                         if (spdk_unlikely(rdma_req->req.dif_enabled)) {
    2239           0 :                                 if (rdma_req->req.xfer == SPDK_NVME_DATA_HOST_TO_CONTROLLER) {
    2240             :                                         /* generate DIF for write operation */
    2241           0 :                                         num_blocks = SPDK_CEIL_DIV(rdma_req->req.dif.elba_length, rdma_req->req.dif.dif_ctx.block_size);
    2242           0 :                                         assert(num_blocks > 0);
    2243             : 
    2244           0 :                                         rc = spdk_dif_generate(rdma_req->req.iov, rdma_req->req.iovcnt,
    2245           0 :                                                                num_blocks, &rdma_req->req.dif.dif_ctx);
    2246           0 :                                         if (rc != 0) {
    2247           0 :                                                 SPDK_ERRLOG("DIF generation failed\n");
    2248           0 :                                                 rdma_req->state = RDMA_REQUEST_STATE_COMPLETED;
    2249           0 :                                                 spdk_nvmf_qpair_disconnect(&rqpair->qpair);
    2250           0 :                                                 break;
    2251             :                                         }
    2252             :                                 }
    2253             : 
    2254           0 :                                 assert(rdma_req->req.dif.elba_length >= rdma_req->req.length);
    2255             :                                 /* set extended length before IO operation */
    2256           0 :                                 rdma_req->req.length = rdma_req->req.dif.elba_length;
    2257             :                         }
    2258             : 
    2259           5 :                         if (rdma_req->req.cmd->nvme_cmd.fuse != SPDK_NVME_CMD_FUSE_NONE) {
    2260           0 :                                 if (rdma_req->fused_failed) {
    2261             :                                         /* This request failed FUSED semantics.  Fail it immediately, without
    2262             :                                          * even sending it to the target layer.
    2263             :                                          */
    2264           0 :                                         rsp->status.sct = SPDK_NVME_SCT_GENERIC;
    2265           0 :                                         rsp->status.sc = SPDK_NVME_SC_ABORTED_MISSING_FUSED;
    2266           0 :                                         STAILQ_INSERT_TAIL(&rqpair->pending_rdma_send_queue, rdma_req, state_link);
    2267           0 :                                         rdma_req->state = RDMA_REQUEST_STATE_READY_TO_COMPLETE_PENDING;
    2268           0 :                                         break;
    2269             :                                 }
    2270             : 
    2271           0 :                                 if (rdma_req->fused_pair == NULL ||
    2272           0 :                                     rdma_req->fused_pair->state != RDMA_REQUEST_STATE_READY_TO_EXECUTE) {
    2273             :                                         /* This request is ready to execute, but either we don't know yet if it's
    2274             :                                          * valid - i.e. this is a FIRST but we haven't received the next
    2275             :                                          * request yet or the other request of this fused pair isn't ready to
    2276             :                                          * execute.  So break here and this request will get processed later either
    2277             :                                          * when the other request is ready or we find that this request isn't valid.
    2278             :                                          */
    2279             :                                         break;
    2280             :                                 }
    2281             :                         }
    2282             : 
    2283             :                         /* If we get to this point, and this request is a fused command, we know that
    2284             :                          * it is part of valid sequence (FIRST followed by a SECOND) and that both
    2285             :                          * requests are READY_TO_EXECUTE. So call spdk_nvmf_request_exec() both on this
    2286             :                          * request, and the other request of the fused pair, in the correct order.
    2287             :                          * Also clear the ->fused_pair pointers on both requests, since after this point
    2288             :                          * we no longer need to maintain the relationship between these two requests.
    2289             :                          */
    2290           5 :                         if (rdma_req->req.cmd->nvme_cmd.fuse == SPDK_NVME_CMD_FUSE_SECOND) {
    2291           0 :                                 assert(rdma_req->fused_pair != NULL);
    2292           0 :                                 assert(rdma_req->fused_pair->fused_pair != NULL);
    2293           0 :                                 rdma_req->fused_pair->state = RDMA_REQUEST_STATE_EXECUTING;
    2294           0 :                                 spdk_nvmf_request_exec(&rdma_req->fused_pair->req);
    2295           0 :                                 rdma_req->fused_pair->fused_pair = NULL;
    2296           0 :                                 rdma_req->fused_pair = NULL;
    2297             :                         }
    2298           5 :                         rdma_req->state = RDMA_REQUEST_STATE_EXECUTING;
    2299           5 :                         spdk_nvmf_request_exec(&rdma_req->req);
    2300           5 :                         if (rdma_req->req.cmd->nvme_cmd.fuse == SPDK_NVME_CMD_FUSE_FIRST) {
    2301           0 :                                 assert(rdma_req->fused_pair != NULL);
    2302           0 :                                 assert(rdma_req->fused_pair->fused_pair != NULL);
    2303           0 :                                 rdma_req->fused_pair->state = RDMA_REQUEST_STATE_EXECUTING;
    2304           0 :                                 spdk_nvmf_request_exec(&rdma_req->fused_pair->req);
    2305           0 :                                 rdma_req->fused_pair->fused_pair = NULL;
    2306           0 :                                 rdma_req->fused_pair = NULL;
    2307             :                         }
    2308           5 :                         break;
    2309           5 :                 case RDMA_REQUEST_STATE_EXECUTING:
    2310           5 :                         spdk_trace_record(TRACE_RDMA_REQUEST_STATE_EXECUTING, 0, 0,
    2311             :                                           (uintptr_t)rdma_req, (uintptr_t)rqpair);
    2312             :                         /* Some external code must kick a request into RDMA_REQUEST_STATE_EXECUTED
    2313             :                          * to escape this state. */
    2314           5 :                         break;
    2315           5 :                 case RDMA_REQUEST_STATE_EXECUTED:
    2316           5 :                         spdk_trace_record(TRACE_RDMA_REQUEST_STATE_EXECUTED, 0, 0,
    2317             :                                           (uintptr_t)rdma_req, (uintptr_t)rqpair);
    2318           5 :                         if (rsp->status.sc == SPDK_NVME_SC_SUCCESS &&
    2319           5 :                             rdma_req->req.xfer == SPDK_NVME_DATA_CONTROLLER_TO_HOST) {
    2320           1 :                                 STAILQ_INSERT_TAIL(&rqpair->pending_rdma_write_queue, rdma_req, state_link);
    2321           1 :                                 rdma_req->state = RDMA_REQUEST_STATE_DATA_TRANSFER_TO_HOST_PENDING;
    2322             :                         } else {
    2323           4 :                                 STAILQ_INSERT_TAIL(&rqpair->pending_rdma_send_queue, rdma_req, state_link);
    2324           4 :                                 rdma_req->state = RDMA_REQUEST_STATE_READY_TO_COMPLETE_PENDING;
    2325             :                         }
    2326           5 :                         if (spdk_unlikely(rdma_req->req.dif_enabled)) {
    2327             :                                 /* restore the original length */
    2328           0 :                                 rdma_req->req.length = rdma_req->req.dif.orig_length;
    2329             : 
    2330           0 :                                 if (rdma_req->req.xfer == SPDK_NVME_DATA_CONTROLLER_TO_HOST) {
    2331           0 :                                         struct spdk_dif_error error_blk;
    2332             : 
    2333           0 :                                         num_blocks = SPDK_CEIL_DIV(rdma_req->req.dif.elba_length, rdma_req->req.dif.dif_ctx.block_size);
    2334           0 :                                         if (!rdma_req->req.stripped_data) {
    2335           0 :                                                 rc = spdk_dif_verify(rdma_req->req.iov, rdma_req->req.iovcnt, num_blocks,
    2336           0 :                                                                      &rdma_req->req.dif.dif_ctx, &error_blk);
    2337             :                                         } else {
    2338           0 :                                                 rc = spdk_dif_verify_copy(rdma_req->req.stripped_data->iov,
    2339           0 :                                                                           rdma_req->req.stripped_data->iovcnt,
    2340           0 :                                                                           rdma_req->req.iov, rdma_req->req.iovcnt, num_blocks,
    2341           0 :                                                                           &rdma_req->req.dif.dif_ctx, &error_blk);
    2342             :                                         }
    2343           0 :                                         if (rc) {
    2344           0 :                                                 struct spdk_nvme_cpl *rsp = &rdma_req->req.rsp->nvme_cpl;
    2345             : 
    2346           0 :                                                 SPDK_ERRLOG("DIF error detected. type=%d, offset=%" PRIu32 "\n", error_blk.err_type,
    2347             :                                                             error_blk.err_offset);
    2348           0 :                                                 rsp->status.sct = SPDK_NVME_SCT_MEDIA_ERROR;
    2349           0 :                                                 rsp->status.sc = nvmf_rdma_dif_error_to_compl_status(error_blk.err_type);
    2350           0 :                                                 STAILQ_REMOVE(&rqpair->pending_rdma_write_queue, rdma_req, spdk_nvmf_rdma_request, state_link);
    2351           0 :                                                 STAILQ_INSERT_TAIL(&rqpair->pending_rdma_send_queue, rdma_req, state_link);
    2352           0 :                                                 rdma_req->state = RDMA_REQUEST_STATE_READY_TO_COMPLETE_PENDING;
    2353             :                                         }
    2354             :                                 }
    2355             :                         }
    2356           5 :                         break;
    2357           1 :                 case RDMA_REQUEST_STATE_DATA_TRANSFER_TO_HOST_PENDING:
    2358           1 :                         spdk_trace_record(TRACE_RDMA_REQUEST_STATE_DATA_TRANSFER_TO_HOST_PENDING, 0, 0,
    2359             :                                           (uintptr_t)rdma_req, (uintptr_t)rqpair);
    2360             : 
    2361           1 :                         if (rdma_req != STAILQ_FIRST(&rqpair->pending_rdma_write_queue)) {
    2362             :                                 /* This request needs to wait in line to perform RDMA */
    2363           0 :                                 break;
    2364             :                         }
    2365           1 :                         if ((rqpair->current_send_depth + rdma_req->num_outstanding_data_wr + 1) >
    2366           1 :                             rqpair->max_send_depth) {
    2367             :                                 /* We can only have so many WRs outstanding. we have to wait until some finish.
    2368             :                                  * +1 since each request has an additional wr in the resp. */
    2369           0 :                                 rqpair->poller->stat.pending_rdma_write++;
    2370           0 :                                 break;
    2371             :                         }
    2372             : 
    2373             :                         /* We have already verified that this request is the head of the queue. */
    2374           1 :                         STAILQ_REMOVE_HEAD(&rqpair->pending_rdma_write_queue, state_link);
    2375             : 
    2376             :                         /* The data transfer will be kicked off from
    2377             :                          * RDMA_REQUEST_STATE_READY_TO_COMPLETE state.
    2378             :                          * We verified that data + response fit into send queue, so we can go to the next state directly
    2379             :                          */
    2380           1 :                         rdma_req->state = RDMA_REQUEST_STATE_READY_TO_COMPLETE;
    2381           1 :                         break;
    2382           7 :                 case RDMA_REQUEST_STATE_READY_TO_COMPLETE_PENDING:
    2383           7 :                         spdk_trace_record(TRACE_RDMA_REQUEST_STATE_READY_TO_COMPLETE_PENDING, 0, 0,
    2384             :                                           (uintptr_t)rdma_req, (uintptr_t)rqpair);
    2385             : 
    2386           7 :                         if (rdma_req != STAILQ_FIRST(&rqpair->pending_rdma_send_queue)) {
    2387             :                                 /* This request needs to wait in line to send the completion */
    2388           0 :                                 break;
    2389             :                         }
    2390             : 
    2391           7 :                         assert(rqpair->current_send_depth <= rqpair->max_send_depth);
    2392           7 :                         if (rqpair->current_send_depth == rqpair->max_send_depth) {
    2393             :                                 /* We can only have so many WRs outstanding. we have to wait until some finish */
    2394           2 :                                 rqpair->poller->stat.pending_rdma_send++;
    2395           2 :                                 break;
    2396             :                         }
    2397             : 
    2398             :                         /* We have already verified that this request is the head of the queue. */
    2399           5 :                         STAILQ_REMOVE_HEAD(&rqpair->pending_rdma_send_queue, state_link);
    2400             : 
    2401             :                         /* The response sending will be kicked off from
    2402             :                          * RDMA_REQUEST_STATE_READY_TO_COMPLETE state.
    2403             :                          */
    2404           5 :                         rdma_req->state = RDMA_REQUEST_STATE_READY_TO_COMPLETE;
    2405           5 :                         break;
    2406           6 :                 case RDMA_REQUEST_STATE_READY_TO_COMPLETE:
    2407           6 :                         spdk_trace_record(TRACE_RDMA_REQUEST_STATE_READY_TO_COMPLETE, 0, 0,
    2408             :                                           (uintptr_t)rdma_req, (uintptr_t)rqpair);
    2409           6 :                         rc = request_transfer_out(&rdma_req->req, &data_posted);
    2410           6 :                         assert(rc == 0); /* No good way to handle this currently */
    2411           6 :                         if (spdk_unlikely(rc)) {
    2412           0 :                                 rdma_req->state = RDMA_REQUEST_STATE_COMPLETED;
    2413             :                         } else {
    2414           6 :                                 rdma_req->state = data_posted ? RDMA_REQUEST_STATE_TRANSFERRING_CONTROLLER_TO_HOST :
    2415             :                                                   RDMA_REQUEST_STATE_COMPLETING;
    2416             :                         }
    2417           6 :                         break;
    2418           1 :                 case RDMA_REQUEST_STATE_TRANSFERRING_CONTROLLER_TO_HOST:
    2419           1 :                         spdk_trace_record(TRACE_RDMA_REQUEST_STATE_TRANSFERRING_CONTROLLER_TO_HOST, 0, 0,
    2420             :                                           (uintptr_t)rdma_req, (uintptr_t)rqpair);
    2421             :                         /* Some external code must kick a request into RDMA_REQUEST_STATE_COMPLETED
    2422             :                          * to escape this state. */
    2423           1 :                         break;
    2424           5 :                 case RDMA_REQUEST_STATE_COMPLETING:
    2425           5 :                         spdk_trace_record(TRACE_RDMA_REQUEST_STATE_COMPLETING, 0, 0,
    2426             :                                           (uintptr_t)rdma_req, (uintptr_t)rqpair);
    2427             :                         /* Some external code must kick a request into RDMA_REQUEST_STATE_COMPLETED
    2428             :                          * to escape this state. */
    2429           5 :                         break;
    2430           6 :                 case RDMA_REQUEST_STATE_COMPLETED:
    2431           6 :                         spdk_trace_record(TRACE_RDMA_REQUEST_STATE_COMPLETED, 0, 0,
    2432             :                                           (uintptr_t)rdma_req, (uintptr_t)rqpair, rqpair->qpair.queue_depth);
    2433             : 
    2434           6 :                         rqpair->poller->stat.request_latency += spdk_get_ticks() - rdma_req->receive_tsc;
    2435           6 :                         _nvmf_rdma_request_free(rdma_req, rtransport);
    2436           6 :                         break;
    2437           0 :                 case RDMA_REQUEST_NUM_STATES:
    2438             :                 default:
    2439           0 :                         assert(0);
    2440             :                         break;
    2441             :                 }
    2442             : 
    2443          66 :                 if (rdma_req->state != prev_state) {
    2444          43 :                         progress = true;
    2445             :                 }
    2446          66 :         } while (rdma_req->state != prev_state);
    2447             : 
    2448          23 :         return progress;
    2449             : }
    2450             : 
    2451             : /* Public API callbacks begin here */
    2452             : 
    2453             : #define SPDK_NVMF_RDMA_DEFAULT_MAX_QUEUE_DEPTH 128
    2454             : #define SPDK_NVMF_RDMA_DEFAULT_AQ_DEPTH 128
    2455             : #define SPDK_NVMF_RDMA_DEFAULT_SRQ_DEPTH 4096
    2456             : #define SPDK_NVMF_RDMA_DEFAULT_MAX_QPAIRS_PER_CTRLR 128
    2457             : #define SPDK_NVMF_RDMA_DEFAULT_IN_CAPSULE_DATA_SIZE 4096
    2458             : #define SPDK_NVMF_RDMA_DEFAULT_MAX_IO_SIZE 131072
    2459             : #define SPDK_NVMF_RDMA_MIN_IO_BUFFER_SIZE (SPDK_NVMF_RDMA_DEFAULT_MAX_IO_SIZE / SPDK_NVMF_MAX_SGL_ENTRIES)
    2460             : #define SPDK_NVMF_RDMA_DEFAULT_NUM_SHARED_BUFFERS 4095
    2461             : #define SPDK_NVMF_RDMA_DEFAULT_BUFFER_CACHE_SIZE UINT32_MAX
    2462             : #define SPDK_NVMF_RDMA_DEFAULT_NO_SRQ false
    2463             : #define SPDK_NVMF_RDMA_DIF_INSERT_OR_STRIP false
    2464             : #define SPDK_NVMF_RDMA_ACCEPTOR_BACKLOG 100
    2465             : #define SPDK_NVMF_RDMA_DEFAULT_ABORT_TIMEOUT_SEC 1
    2466             : #define SPDK_NVMF_RDMA_DEFAULT_NO_WR_BATCHING false
    2467             : #define SPDK_NVMF_RDMA_DEFAULT_DATA_WR_POOL_SIZE 4095
    2468             : 
    2469             : static void
    2470           1 : nvmf_rdma_opts_init(struct spdk_nvmf_transport_opts *opts)
    2471             : {
    2472           1 :         opts->max_queue_depth =              SPDK_NVMF_RDMA_DEFAULT_MAX_QUEUE_DEPTH;
    2473           1 :         opts->max_qpairs_per_ctrlr = SPDK_NVMF_RDMA_DEFAULT_MAX_QPAIRS_PER_CTRLR;
    2474           1 :         opts->in_capsule_data_size = SPDK_NVMF_RDMA_DEFAULT_IN_CAPSULE_DATA_SIZE;
    2475           1 :         opts->max_io_size =          SPDK_NVMF_RDMA_DEFAULT_MAX_IO_SIZE;
    2476           1 :         opts->io_unit_size =         SPDK_NVMF_RDMA_MIN_IO_BUFFER_SIZE;
    2477           1 :         opts->max_aq_depth =         SPDK_NVMF_RDMA_DEFAULT_AQ_DEPTH;
    2478           1 :         opts->num_shared_buffers =   SPDK_NVMF_RDMA_DEFAULT_NUM_SHARED_BUFFERS;
    2479           1 :         opts->buf_cache_size =               SPDK_NVMF_RDMA_DEFAULT_BUFFER_CACHE_SIZE;
    2480           1 :         opts->dif_insert_or_strip =  SPDK_NVMF_RDMA_DIF_INSERT_OR_STRIP;
    2481           1 :         opts->abort_timeout_sec =    SPDK_NVMF_RDMA_DEFAULT_ABORT_TIMEOUT_SEC;
    2482           1 :         opts->transport_specific =      NULL;
    2483           1 :         opts->data_wr_pool_size      =       SPDK_NVMF_RDMA_DEFAULT_DATA_WR_POOL_SIZE;
    2484           1 : }
    2485             : 
    2486             : static int nvmf_rdma_destroy(struct spdk_nvmf_transport *transport,
    2487             :                              spdk_nvmf_transport_destroy_done_cb cb_fn, void *cb_arg);
    2488             : 
    2489             : static inline bool
    2490           0 : nvmf_rdma_is_rxe_device(struct spdk_nvmf_rdma_device *device)
    2491             : {
    2492           0 :         return device->attr.vendor_id == SPDK_RDMA_RXE_VENDOR_ID_OLD ||
    2493           0 :                device->attr.vendor_id == SPDK_RDMA_RXE_VENDOR_ID_NEW;
    2494             : }
    2495             : 
    2496             : static int nvmf_rdma_accept(void *ctx);
    2497             : static bool nvmf_rdma_retry_listen_port(struct spdk_nvmf_rdma_transport *rtransport);
    2498             : static void destroy_ib_device(struct spdk_nvmf_rdma_transport *rtransport,
    2499             :                               struct spdk_nvmf_rdma_device *device);
    2500             : 
    2501             : static int
    2502           0 : create_ib_device(struct spdk_nvmf_rdma_transport *rtransport, struct ibv_context *context,
    2503             :                  struct spdk_nvmf_rdma_device **new_device)
    2504             : {
    2505             :         struct spdk_nvmf_rdma_device    *device;
    2506           0 :         int                             flag = 0;
    2507           0 :         int                             rc = 0;
    2508             : 
    2509           0 :         device = calloc(1, sizeof(*device));
    2510           0 :         if (!device) {
    2511           0 :                 SPDK_ERRLOG("Unable to allocate memory for RDMA devices.\n");
    2512           0 :                 return -ENOMEM;
    2513             :         }
    2514           0 :         device->context = context;
    2515           0 :         rc = ibv_query_device(device->context, &device->attr);
    2516           0 :         if (rc < 0) {
    2517           0 :                 SPDK_ERRLOG("Failed to query RDMA device attributes.\n");
    2518           0 :                 free(device);
    2519           0 :                 return rc;
    2520             :         }
    2521             : 
    2522             : #ifdef SPDK_CONFIG_RDMA_SEND_WITH_INVAL
    2523           0 :         if ((device->attr.device_cap_flags & IBV_DEVICE_MEM_MGT_EXTENSIONS) == 0) {
    2524           0 :                 SPDK_WARNLOG("The libibverbs on this system supports SEND_WITH_INVALIDATE,");
    2525           0 :                 SPDK_WARNLOG("but the device with vendor ID %u does not.\n", device->attr.vendor_id);
    2526             :         }
    2527             : 
    2528             :         /**
    2529             :          * The vendor ID is assigned by the IEEE and an ID of 0 implies Soft-RoCE.
    2530             :          * The Soft-RoCE RXE driver does not currently support send with invalidate,
    2531             :          * but incorrectly reports that it does. There are changes making their way
    2532             :          * through the kernel now that will enable this feature. When they are merged,
    2533             :          * we can conditionally enable this feature.
    2534             :          *
    2535             :          * TODO: enable this for versions of the kernel rxe driver that support it.
    2536             :          */
    2537           0 :         if (nvmf_rdma_is_rxe_device(device)) {
    2538           0 :                 device->attr.device_cap_flags &= ~(IBV_DEVICE_MEM_MGT_EXTENSIONS);
    2539             :         }
    2540             : #endif
    2541             : 
    2542             :         /* set up device context async ev fd as NON_BLOCKING */
    2543           0 :         flag = fcntl(device->context->async_fd, F_GETFL);
    2544           0 :         rc = fcntl(device->context->async_fd, F_SETFL, flag | O_NONBLOCK);
    2545           0 :         if (rc < 0) {
    2546           0 :                 SPDK_ERRLOG("Failed to set context async fd to NONBLOCK.\n");
    2547           0 :                 free(device);
    2548           0 :                 return rc;
    2549             :         }
    2550             : 
    2551           0 :         TAILQ_INSERT_TAIL(&rtransport->devices, device, link);
    2552           0 :         SPDK_DEBUGLOG(rdma, "New device %p is added to RDMA trasport\n", device);
    2553             : 
    2554           0 :         if (g_nvmf_hooks.get_ibv_pd) {
    2555           0 :                 device->pd = g_nvmf_hooks.get_ibv_pd(NULL, device->context);
    2556             :         } else {
    2557           0 :                 device->pd = ibv_alloc_pd(device->context);
    2558             :         }
    2559             : 
    2560           0 :         if (!device->pd) {
    2561           0 :                 SPDK_ERRLOG("Unable to allocate protection domain.\n");
    2562           0 :                 destroy_ib_device(rtransport, device);
    2563           0 :                 return -ENOMEM;
    2564             :         }
    2565             : 
    2566           0 :         assert(device->map == NULL);
    2567             : 
    2568           0 :         device->map = spdk_rdma_utils_create_mem_map(device->pd, &g_nvmf_hooks, IBV_ACCESS_LOCAL_WRITE);
    2569           0 :         if (!device->map) {
    2570           0 :                 SPDK_ERRLOG("Unable to allocate memory map for listen address\n");
    2571           0 :                 destroy_ib_device(rtransport, device);
    2572           0 :                 return -ENOMEM;
    2573             :         }
    2574             : 
    2575           0 :         assert(device->map != NULL);
    2576           0 :         assert(device->pd != NULL);
    2577             : 
    2578           0 :         if (new_device) {
    2579           0 :                 *new_device = device;
    2580             :         }
    2581           0 :         SPDK_NOTICELOG("Create IB device %s(%p/%p) succeed.\n", ibv_get_device_name(context->device),
    2582             :                        device, context);
    2583             : 
    2584           0 :         return 0;
    2585             : }
    2586             : 
    2587             : static void
    2588           0 : free_poll_fds(struct spdk_nvmf_rdma_transport *rtransport)
    2589             : {
    2590           0 :         if (rtransport->poll_fds) {
    2591           0 :                 free(rtransport->poll_fds);
    2592           0 :                 rtransport->poll_fds = NULL;
    2593             :         }
    2594           0 :         rtransport->npoll_fds = 0;
    2595           0 : }
    2596             : 
    2597             : static int
    2598           0 : generate_poll_fds(struct spdk_nvmf_rdma_transport *rtransport)
    2599             : {
    2600             :         /* Set up poll descriptor array to monitor events from RDMA and IB
    2601             :          * in a single poll syscall
    2602             :          */
    2603           0 :         int device_count = 0;
    2604           0 :         int i = 0;
    2605             :         struct spdk_nvmf_rdma_device *device, *tmp;
    2606             : 
    2607           0 :         TAILQ_FOREACH_SAFE(device, &rtransport->devices, link, tmp) {
    2608           0 :                 device_count++;
    2609             :         }
    2610             : 
    2611           0 :         rtransport->npoll_fds = device_count + 1;
    2612             : 
    2613           0 :         rtransport->poll_fds = calloc(rtransport->npoll_fds, sizeof(struct pollfd));
    2614           0 :         if (rtransport->poll_fds == NULL) {
    2615           0 :                 SPDK_ERRLOG("poll_fds allocation failed\n");
    2616           0 :                 return -ENOMEM;
    2617             :         }
    2618             : 
    2619           0 :         rtransport->poll_fds[i].fd = rtransport->event_channel->fd;
    2620           0 :         rtransport->poll_fds[i++].events = POLLIN;
    2621             : 
    2622           0 :         TAILQ_FOREACH_SAFE(device, &rtransport->devices, link, tmp) {
    2623           0 :                 rtransport->poll_fds[i].fd = device->context->async_fd;
    2624           0 :                 rtransport->poll_fds[i++].events = POLLIN;
    2625             :         }
    2626             : 
    2627           0 :         return 0;
    2628             : }
    2629             : 
    2630             : static struct spdk_nvmf_transport *
    2631           0 : nvmf_rdma_create(struct spdk_nvmf_transport_opts *opts)
    2632             : {
    2633             :         int rc;
    2634             :         struct spdk_nvmf_rdma_transport *rtransport;
    2635           0 :         struct spdk_nvmf_rdma_device    *device;
    2636             :         struct ibv_context              **contexts;
    2637             :         size_t                          data_wr_pool_size;
    2638             :         uint32_t                        i;
    2639             :         int                             flag;
    2640             :         uint32_t                        sge_count;
    2641             :         uint32_t                        min_shared_buffers;
    2642             :         uint32_t                        min_in_capsule_data_size;
    2643           0 :         int                             max_device_sge = SPDK_NVMF_MAX_SGL_ENTRIES;
    2644             : 
    2645           0 :         rtransport = calloc(1, sizeof(*rtransport));
    2646           0 :         if (!rtransport) {
    2647           0 :                 return NULL;
    2648             :         }
    2649             : 
    2650           0 :         TAILQ_INIT(&rtransport->devices);
    2651           0 :         TAILQ_INIT(&rtransport->ports);
    2652           0 :         TAILQ_INIT(&rtransport->poll_groups);
    2653           0 :         TAILQ_INIT(&rtransport->retry_ports);
    2654             : 
    2655           0 :         rtransport->transport.ops = &spdk_nvmf_transport_rdma;
    2656           0 :         rtransport->rdma_opts.num_cqe = DEFAULT_NVMF_RDMA_CQ_SIZE;
    2657           0 :         rtransport->rdma_opts.max_srq_depth = SPDK_NVMF_RDMA_DEFAULT_SRQ_DEPTH;
    2658           0 :         rtransport->rdma_opts.no_srq = SPDK_NVMF_RDMA_DEFAULT_NO_SRQ;
    2659           0 :         rtransport->rdma_opts.acceptor_backlog = SPDK_NVMF_RDMA_ACCEPTOR_BACKLOG;
    2660           0 :         rtransport->rdma_opts.no_wr_batching = SPDK_NVMF_RDMA_DEFAULT_NO_WR_BATCHING;
    2661           0 :         if (opts->transport_specific != NULL &&
    2662           0 :             spdk_json_decode_object_relaxed(opts->transport_specific, rdma_transport_opts_decoder,
    2663             :                                             SPDK_COUNTOF(rdma_transport_opts_decoder),
    2664           0 :                                             &rtransport->rdma_opts)) {
    2665           0 :                 SPDK_ERRLOG("spdk_json_decode_object_relaxed failed\n");
    2666           0 :                 nvmf_rdma_destroy(&rtransport->transport, NULL, NULL);
    2667           0 :                 return NULL;
    2668             :         }
    2669             : 
    2670           0 :         SPDK_INFOLOG(rdma, "*** RDMA Transport Init ***\n"
    2671             :                      "  Transport opts:  max_ioq_depth=%d, max_io_size=%d,\n"
    2672             :                      "  max_io_qpairs_per_ctrlr=%d, io_unit_size=%d,\n"
    2673             :                      "  in_capsule_data_size=%d, max_aq_depth=%d,\n"
    2674             :                      "  num_shared_buffers=%d, num_cqe=%d, max_srq_depth=%d, no_srq=%d,"
    2675             :                      "  acceptor_backlog=%d, no_wr_batching=%d abort_timeout_sec=%d\n",
    2676             :                      opts->max_queue_depth,
    2677             :                      opts->max_io_size,
    2678             :                      opts->max_qpairs_per_ctrlr - 1,
    2679             :                      opts->io_unit_size,
    2680             :                      opts->in_capsule_data_size,
    2681             :                      opts->max_aq_depth,
    2682             :                      opts->num_shared_buffers,
    2683             :                      rtransport->rdma_opts.num_cqe,
    2684             :                      rtransport->rdma_opts.max_srq_depth,
    2685             :                      rtransport->rdma_opts.no_srq,
    2686             :                      rtransport->rdma_opts.acceptor_backlog,
    2687             :                      rtransport->rdma_opts.no_wr_batching,
    2688             :                      opts->abort_timeout_sec);
    2689             : 
    2690             :         /* I/O unit size cannot be larger than max I/O size */
    2691           0 :         if (opts->io_unit_size > opts->max_io_size) {
    2692           0 :                 opts->io_unit_size = opts->max_io_size;
    2693             :         }
    2694             : 
    2695           0 :         if (rtransport->rdma_opts.acceptor_backlog <= 0) {
    2696           0 :                 SPDK_ERRLOG("The acceptor backlog cannot be less than 1, setting to the default value of (%d).\n",
    2697             :                             SPDK_NVMF_RDMA_ACCEPTOR_BACKLOG);
    2698           0 :                 rtransport->rdma_opts.acceptor_backlog = SPDK_NVMF_RDMA_ACCEPTOR_BACKLOG;
    2699             :         }
    2700             : 
    2701           0 :         if (opts->num_shared_buffers < (SPDK_NVMF_MAX_SGL_ENTRIES * 2)) {
    2702           0 :                 SPDK_ERRLOG("The number of shared data buffers (%d) is less than"
    2703             :                             "the minimum number required to guarantee that forward progress can be made (%d)\n",
    2704             :                             opts->num_shared_buffers, (SPDK_NVMF_MAX_SGL_ENTRIES * 2));
    2705           0 :                 nvmf_rdma_destroy(&rtransport->transport, NULL, NULL);
    2706           0 :                 return NULL;
    2707             :         }
    2708             : 
    2709             :         /* If buf_cache_size == UINT32_MAX, we will dynamically pick a cache size later that we know will fit. */
    2710           0 :         if (opts->buf_cache_size < UINT32_MAX) {
    2711           0 :                 min_shared_buffers = spdk_env_get_core_count() * opts->buf_cache_size;
    2712           0 :                 if (min_shared_buffers > opts->num_shared_buffers) {
    2713           0 :                         SPDK_ERRLOG("There are not enough buffers to satisfy"
    2714             :                                     "per-poll group caches for each thread. (%" PRIu32 ")"
    2715             :                                     "supplied. (%" PRIu32 ") required\n", opts->num_shared_buffers, min_shared_buffers);
    2716           0 :                         SPDK_ERRLOG("Please specify a larger number of shared buffers\n");
    2717           0 :                         nvmf_rdma_destroy(&rtransport->transport, NULL, NULL);
    2718           0 :                         return NULL;
    2719             :                 }
    2720             :         }
    2721             : 
    2722           0 :         sge_count = opts->max_io_size / opts->io_unit_size;
    2723           0 :         if (sge_count > NVMF_DEFAULT_TX_SGE) {
    2724           0 :                 SPDK_ERRLOG("Unsupported IO Unit size specified, %d bytes\n", opts->io_unit_size);
    2725           0 :                 nvmf_rdma_destroy(&rtransport->transport, NULL, NULL);
    2726           0 :                 return NULL;
    2727             :         }
    2728             : 
    2729           0 :         min_in_capsule_data_size = sizeof(struct spdk_nvme_sgl_descriptor) * SPDK_NVMF_MAX_SGL_ENTRIES;
    2730           0 :         if (opts->in_capsule_data_size < min_in_capsule_data_size) {
    2731           0 :                 SPDK_WARNLOG("In capsule data size is set to %u, this is minimum size required to support msdbd=16\n",
    2732             :                              min_in_capsule_data_size);
    2733           0 :                 opts->in_capsule_data_size = min_in_capsule_data_size;
    2734             :         }
    2735             : 
    2736           0 :         rtransport->event_channel = rdma_create_event_channel();
    2737           0 :         if (rtransport->event_channel == NULL) {
    2738           0 :                 SPDK_ERRLOG("rdma_create_event_channel() failed, %s\n", spdk_strerror(errno));
    2739           0 :                 nvmf_rdma_destroy(&rtransport->transport, NULL, NULL);
    2740           0 :                 return NULL;
    2741             :         }
    2742             : 
    2743           0 :         flag = fcntl(rtransport->event_channel->fd, F_GETFL);
    2744           0 :         if (fcntl(rtransport->event_channel->fd, F_SETFL, flag | O_NONBLOCK) < 0) {
    2745           0 :                 SPDK_ERRLOG("fcntl can't set nonblocking mode for socket, fd: %d (%s)\n",
    2746             :                             rtransport->event_channel->fd, spdk_strerror(errno));
    2747           0 :                 nvmf_rdma_destroy(&rtransport->transport, NULL, NULL);
    2748           0 :                 return NULL;
    2749             :         }
    2750             : 
    2751           0 :         data_wr_pool_size = opts->data_wr_pool_size;
    2752           0 :         if (data_wr_pool_size < SPDK_NVMF_MAX_SGL_ENTRIES * 2 * spdk_env_get_core_count()) {
    2753           0 :                 data_wr_pool_size = SPDK_NVMF_MAX_SGL_ENTRIES * 2 * spdk_env_get_core_count();
    2754           0 :                 SPDK_NOTICELOG("data_wr_pool_size is changed to %zu to guarantee enough cache for handling "
    2755             :                                "at least one IO in each core\n", data_wr_pool_size);
    2756             :         }
    2757           0 :         rtransport->data_wr_pool = spdk_mempool_create("spdk_nvmf_rdma_wr_data", data_wr_pool_size,
    2758             :                                    sizeof(struct spdk_nvmf_rdma_request_data), SPDK_MEMPOOL_DEFAULT_CACHE_SIZE,
    2759             :                                    SPDK_ENV_SOCKET_ID_ANY);
    2760           0 :         if (!rtransport->data_wr_pool) {
    2761           0 :                 if (spdk_mempool_lookup("spdk_nvmf_rdma_wr_data") != NULL) {
    2762           0 :                         SPDK_ERRLOG("Unable to allocate work request pool for poll group: already exists\n");
    2763           0 :                         SPDK_ERRLOG("Probably running in multiprocess environment, which is "
    2764             :                                     "unsupported by the nvmf library\n");
    2765             :                 } else {
    2766           0 :                         SPDK_ERRLOG("Unable to allocate work request pool for poll group\n");
    2767             :                 }
    2768           0 :                 nvmf_rdma_destroy(&rtransport->transport, NULL, NULL);
    2769           0 :                 return NULL;
    2770             :         }
    2771             : 
    2772           0 :         contexts = rdma_get_devices(NULL);
    2773           0 :         if (contexts == NULL) {
    2774           0 :                 SPDK_ERRLOG("rdma_get_devices() failed: %s (%d)\n", spdk_strerror(errno), errno);
    2775           0 :                 nvmf_rdma_destroy(&rtransport->transport, NULL, NULL);
    2776           0 :                 return NULL;
    2777             :         }
    2778             : 
    2779           0 :         i = 0;
    2780           0 :         rc = 0;
    2781           0 :         while (contexts[i] != NULL) {
    2782           0 :                 rc = create_ib_device(rtransport, contexts[i], &device);
    2783           0 :                 if (rc < 0) {
    2784           0 :                         break;
    2785             :                 }
    2786           0 :                 i++;
    2787           0 :                 max_device_sge = spdk_min(max_device_sge, device->attr.max_sge);
    2788           0 :                 device->is_ready = true;
    2789             :         }
    2790           0 :         rdma_free_devices(contexts);
    2791             : 
    2792           0 :         if (opts->io_unit_size * max_device_sge < opts->max_io_size) {
    2793             :                 /* divide and round up. */
    2794           0 :                 opts->io_unit_size = (opts->max_io_size + max_device_sge - 1) / max_device_sge;
    2795             : 
    2796             :                 /* round up to the nearest 4k. */
    2797           0 :                 opts->io_unit_size = (opts->io_unit_size + NVMF_DATA_BUFFER_ALIGNMENT - 1) & ~NVMF_DATA_BUFFER_MASK;
    2798             : 
    2799           0 :                 opts->io_unit_size = spdk_max(opts->io_unit_size, SPDK_NVMF_RDMA_MIN_IO_BUFFER_SIZE);
    2800           0 :                 SPDK_NOTICELOG("Adjusting the io unit size to fit the device's maximum I/O size. New I/O unit size %u\n",
    2801             :                                opts->io_unit_size);
    2802             :         }
    2803             : 
    2804           0 :         if (rc < 0) {
    2805           0 :                 nvmf_rdma_destroy(&rtransport->transport, NULL, NULL);
    2806           0 :                 return NULL;
    2807             :         }
    2808             : 
    2809           0 :         rc = generate_poll_fds(rtransport);
    2810           0 :         if (rc < 0) {
    2811           0 :                 nvmf_rdma_destroy(&rtransport->transport, NULL, NULL);
    2812           0 :                 return NULL;
    2813             :         }
    2814             : 
    2815           0 :         rtransport->accept_poller = SPDK_POLLER_REGISTER(nvmf_rdma_accept, &rtransport->transport,
    2816             :                                     opts->acceptor_poll_rate);
    2817           0 :         if (!rtransport->accept_poller) {
    2818           0 :                 nvmf_rdma_destroy(&rtransport->transport, NULL, NULL);
    2819           0 :                 return NULL;
    2820             :         }
    2821             : 
    2822           0 :         return &rtransport->transport;
    2823             : }
    2824             : 
    2825             : static void
    2826           0 : destroy_ib_device(struct spdk_nvmf_rdma_transport *rtransport,
    2827             :                   struct spdk_nvmf_rdma_device *device)
    2828             : {
    2829           0 :         TAILQ_REMOVE(&rtransport->devices, device, link);
    2830           0 :         spdk_rdma_utils_free_mem_map(&device->map);
    2831           0 :         if (device->pd) {
    2832           0 :                 if (!g_nvmf_hooks.get_ibv_pd) {
    2833           0 :                         ibv_dealloc_pd(device->pd);
    2834             :                 }
    2835             :         }
    2836           0 :         SPDK_DEBUGLOG(rdma, "IB device [%p] is destroyed.\n", device);
    2837           0 :         free(device);
    2838           0 : }
    2839             : 
    2840             : static void
    2841           0 : nvmf_rdma_dump_opts(struct spdk_nvmf_transport *transport, struct spdk_json_write_ctx *w)
    2842             : {
    2843             :         struct spdk_nvmf_rdma_transport *rtransport;
    2844           0 :         assert(w != NULL);
    2845             : 
    2846           0 :         rtransport = SPDK_CONTAINEROF(transport, struct spdk_nvmf_rdma_transport, transport);
    2847           0 :         spdk_json_write_named_uint32(w, "max_srq_depth", rtransport->rdma_opts.max_srq_depth);
    2848           0 :         spdk_json_write_named_bool(w, "no_srq", rtransport->rdma_opts.no_srq);
    2849           0 :         if (rtransport->rdma_opts.no_srq == true) {
    2850           0 :                 spdk_json_write_named_int32(w, "num_cqe", rtransport->rdma_opts.num_cqe);
    2851             :         }
    2852           0 :         spdk_json_write_named_int32(w, "acceptor_backlog", rtransport->rdma_opts.acceptor_backlog);
    2853           0 :         spdk_json_write_named_bool(w, "no_wr_batching", rtransport->rdma_opts.no_wr_batching);
    2854           0 : }
    2855             : 
    2856             : static int
    2857           0 : nvmf_rdma_destroy(struct spdk_nvmf_transport *transport,
    2858             :                   spdk_nvmf_transport_destroy_done_cb cb_fn, void *cb_arg)
    2859             : {
    2860             :         struct spdk_nvmf_rdma_transport *rtransport;
    2861             :         struct spdk_nvmf_rdma_port      *port, *port_tmp;
    2862             :         struct spdk_nvmf_rdma_device    *device, *device_tmp;
    2863             : 
    2864           0 :         rtransport = SPDK_CONTAINEROF(transport, struct spdk_nvmf_rdma_transport, transport);
    2865             : 
    2866           0 :         TAILQ_FOREACH_SAFE(port, &rtransport->retry_ports, link, port_tmp) {
    2867           0 :                 TAILQ_REMOVE(&rtransport->retry_ports, port, link);
    2868           0 :                 free(port);
    2869             :         }
    2870             : 
    2871           0 :         TAILQ_FOREACH_SAFE(port, &rtransport->ports, link, port_tmp) {
    2872           0 :                 TAILQ_REMOVE(&rtransport->ports, port, link);
    2873           0 :                 rdma_destroy_id(port->id);
    2874           0 :                 free(port);
    2875             :         }
    2876             : 
    2877           0 :         free_poll_fds(rtransport);
    2878             : 
    2879           0 :         if (rtransport->event_channel != NULL) {
    2880           0 :                 rdma_destroy_event_channel(rtransport->event_channel);
    2881             :         }
    2882             : 
    2883           0 :         TAILQ_FOREACH_SAFE(device, &rtransport->devices, link, device_tmp) {
    2884           0 :                 destroy_ib_device(rtransport, device);
    2885             :         }
    2886             : 
    2887           0 :         if (rtransport->data_wr_pool != NULL) {
    2888           0 :                 if (spdk_mempool_count(rtransport->data_wr_pool) != transport->opts.data_wr_pool_size) {
    2889           0 :                         SPDK_ERRLOG("transport wr pool count is %zu but should be %u\n",
    2890             :                                     spdk_mempool_count(rtransport->data_wr_pool),
    2891             :                                     transport->opts.max_queue_depth * SPDK_NVMF_MAX_SGL_ENTRIES);
    2892             :                 }
    2893             :         }
    2894             : 
    2895           0 :         spdk_mempool_free(rtransport->data_wr_pool);
    2896             : 
    2897           0 :         spdk_poller_unregister(&rtransport->accept_poller);
    2898           0 :         free(rtransport);
    2899             : 
    2900           0 :         if (cb_fn) {
    2901           0 :                 cb_fn(cb_arg);
    2902             :         }
    2903           0 :         return 0;
    2904             : }
    2905             : 
    2906             : static int nvmf_rdma_trid_from_cm_id(struct rdma_cm_id *id,
    2907             :                                      struct spdk_nvme_transport_id *trid,
    2908             :                                      bool peer);
    2909             : 
    2910             : static bool nvmf_rdma_rescan_devices(struct spdk_nvmf_rdma_transport *rtransport);
    2911             : 
    2912             : static int
    2913           0 : nvmf_rdma_listen(struct spdk_nvmf_transport *transport, const struct spdk_nvme_transport_id *trid,
    2914             :                  struct spdk_nvmf_listen_opts *listen_opts)
    2915             : {
    2916             :         struct spdk_nvmf_rdma_transport *rtransport;
    2917             :         struct spdk_nvmf_rdma_device    *device;
    2918             :         struct spdk_nvmf_rdma_port      *port, *tmp_port;
    2919           0 :         struct addrinfo                 *res;
    2920           0 :         struct addrinfo                 hints;
    2921             :         int                             family;
    2922             :         int                             rc;
    2923             :         long int                        port_val;
    2924           0 :         bool                            is_retry = false;
    2925             : 
    2926           0 :         if (!strlen(trid->trsvcid)) {
    2927           0 :                 SPDK_ERRLOG("Service id is required\n");
    2928           0 :                 return -EINVAL;
    2929             :         }
    2930             : 
    2931           0 :         rtransport = SPDK_CONTAINEROF(transport, struct spdk_nvmf_rdma_transport, transport);
    2932           0 :         assert(rtransport->event_channel != NULL);
    2933             : 
    2934           0 :         port = calloc(1, sizeof(*port));
    2935           0 :         if (!port) {
    2936           0 :                 SPDK_ERRLOG("Port allocation failed\n");
    2937           0 :                 return -ENOMEM;
    2938             :         }
    2939             : 
    2940           0 :         port->trid = trid;
    2941             : 
    2942           0 :         switch (trid->adrfam) {
    2943           0 :         case SPDK_NVMF_ADRFAM_IPV4:
    2944           0 :                 family = AF_INET;
    2945           0 :                 break;
    2946           0 :         case SPDK_NVMF_ADRFAM_IPV6:
    2947           0 :                 family = AF_INET6;
    2948           0 :                 break;
    2949           0 :         default:
    2950           0 :                 SPDK_ERRLOG("Unhandled ADRFAM %d\n", trid->adrfam);
    2951           0 :                 free(port);
    2952           0 :                 return -EINVAL;
    2953             :         }
    2954             : 
    2955           0 :         memset(&hints, 0, sizeof(hints));
    2956           0 :         hints.ai_family = family;
    2957           0 :         hints.ai_flags = AI_NUMERICSERV;
    2958           0 :         hints.ai_socktype = SOCK_STREAM;
    2959           0 :         hints.ai_protocol = 0;
    2960             : 
    2961             :         /* Range check the trsvcid. Fail in 3 cases:
    2962             :          * < 0: means that spdk_strtol hit an error
    2963             :          * 0: this results in ephemeral port which we don't want
    2964             :          * > 65535: port too high
    2965             :          */
    2966           0 :         port_val = spdk_strtol(trid->trsvcid, 10);
    2967           0 :         if (port_val <= 0 || port_val > 65535) {
    2968           0 :                 SPDK_ERRLOG("invalid trsvcid %s\n", trid->trsvcid);
    2969           0 :                 free(port);
    2970           0 :                 return -EINVAL;
    2971             :         }
    2972             : 
    2973           0 :         rc = getaddrinfo(trid->traddr, trid->trsvcid, &hints, &res);
    2974           0 :         if (rc) {
    2975           0 :                 SPDK_ERRLOG("getaddrinfo failed: %s (%d)\n", gai_strerror(rc), rc);
    2976           0 :                 free(port);
    2977           0 :                 return -(abs(rc));
    2978             :         }
    2979             : 
    2980           0 :         rc = rdma_create_id(rtransport->event_channel, &port->id, port, RDMA_PS_TCP);
    2981           0 :         if (rc < 0) {
    2982           0 :                 SPDK_ERRLOG("rdma_create_id() failed\n");
    2983           0 :                 freeaddrinfo(res);
    2984           0 :                 free(port);
    2985           0 :                 return rc;
    2986             :         }
    2987             : 
    2988           0 :         rc = rdma_bind_addr(port->id, res->ai_addr);
    2989           0 :         freeaddrinfo(res);
    2990             : 
    2991           0 :         if (rc < 0) {
    2992           0 :                 TAILQ_FOREACH(tmp_port, &rtransport->retry_ports, link) {
    2993           0 :                         if (spdk_nvme_transport_id_compare(tmp_port->trid, trid) == 0) {
    2994           0 :                                 is_retry = true;
    2995           0 :                                 break;
    2996             :                         }
    2997             :                 }
    2998           0 :                 if (!is_retry) {
    2999           0 :                         SPDK_ERRLOG("rdma_bind_addr() failed\n");
    3000             :                 }
    3001           0 :                 rdma_destroy_id(port->id);
    3002           0 :                 free(port);
    3003           0 :                 return rc;
    3004             :         }
    3005             : 
    3006           0 :         if (!port->id->verbs) {
    3007           0 :                 SPDK_ERRLOG("ibv_context is null\n");
    3008           0 :                 rdma_destroy_id(port->id);
    3009           0 :                 free(port);
    3010           0 :                 return -1;
    3011             :         }
    3012             : 
    3013           0 :         rc = rdma_listen(port->id, rtransport->rdma_opts.acceptor_backlog);
    3014           0 :         if (rc < 0) {
    3015           0 :                 SPDK_ERRLOG("rdma_listen() failed\n");
    3016           0 :                 rdma_destroy_id(port->id);
    3017           0 :                 free(port);
    3018           0 :                 return rc;
    3019             :         }
    3020             : 
    3021           0 :         TAILQ_FOREACH(device, &rtransport->devices, link) {
    3022           0 :                 if (device->context == port->id->verbs && device->is_ready) {
    3023           0 :                         port->device = device;
    3024           0 :                         break;
    3025             :                 }
    3026             :         }
    3027           0 :         if (!port->device) {
    3028           0 :                 SPDK_ERRLOG("Accepted a connection with verbs %p, but unable to find a corresponding device.\n",
    3029             :                             port->id->verbs);
    3030           0 :                 rdma_destroy_id(port->id);
    3031           0 :                 free(port);
    3032           0 :                 nvmf_rdma_rescan_devices(rtransport);
    3033           0 :                 return -EINVAL;
    3034             :         }
    3035             : 
    3036           0 :         SPDK_NOTICELOG("*** NVMe/RDMA Target Listening on %s port %s ***\n",
    3037             :                        trid->traddr, trid->trsvcid);
    3038             : 
    3039           0 :         TAILQ_INSERT_TAIL(&rtransport->ports, port, link);
    3040           0 :         return 0;
    3041             : }
    3042             : 
    3043             : static void
    3044           0 : nvmf_rdma_stop_listen_ex(struct spdk_nvmf_transport *transport,
    3045             :                          const struct spdk_nvme_transport_id *trid, bool need_retry)
    3046             : {
    3047             :         struct spdk_nvmf_rdma_transport *rtransport;
    3048             :         struct spdk_nvmf_rdma_port      *port, *tmp;
    3049             : 
    3050           0 :         rtransport = SPDK_CONTAINEROF(transport, struct spdk_nvmf_rdma_transport, transport);
    3051             : 
    3052           0 :         if (!need_retry) {
    3053           0 :                 TAILQ_FOREACH_SAFE(port, &rtransport->retry_ports, link, tmp) {
    3054           0 :                         if (spdk_nvme_transport_id_compare(port->trid, trid) == 0) {
    3055           0 :                                 TAILQ_REMOVE(&rtransport->retry_ports, port, link);
    3056           0 :                                 free(port);
    3057             :                         }
    3058             :                 }
    3059             :         }
    3060             : 
    3061           0 :         TAILQ_FOREACH_SAFE(port, &rtransport->ports, link, tmp) {
    3062           0 :                 if (spdk_nvme_transport_id_compare(port->trid, trid) == 0) {
    3063           0 :                         SPDK_DEBUGLOG(rdma, "Port %s:%s removed. need retry: %d\n",
    3064             :                                       port->trid->traddr, port->trid->trsvcid, need_retry);
    3065           0 :                         TAILQ_REMOVE(&rtransport->ports, port, link);
    3066           0 :                         rdma_destroy_id(port->id);
    3067           0 :                         port->id = NULL;
    3068           0 :                         port->device = NULL;
    3069           0 :                         if (need_retry) {
    3070           0 :                                 TAILQ_INSERT_TAIL(&rtransport->retry_ports, port, link);
    3071             :                         } else {
    3072           0 :                                 free(port);
    3073             :                         }
    3074           0 :                         break;
    3075             :                 }
    3076             :         }
    3077           0 : }
    3078             : 
    3079             : static void
    3080           0 : nvmf_rdma_stop_listen(struct spdk_nvmf_transport *transport,
    3081             :                       const struct spdk_nvme_transport_id *trid)
    3082             : {
    3083           0 :         nvmf_rdma_stop_listen_ex(transport, trid, false);
    3084           0 : }
    3085             : 
    3086             : static void _nvmf_rdma_register_poller_in_group(void *c);
    3087             : static void _nvmf_rdma_remove_poller_in_group(void *c);
    3088             : 
    3089             : static bool
    3090           0 : nvmf_rdma_all_pollers_management_done(void *c)
    3091             : {
    3092           0 :         struct poller_manage_ctx        *ctx = c;
    3093             :         int                             counter;
    3094             : 
    3095           0 :         counter = __atomic_sub_fetch(ctx->inflight_op_counter, 1, __ATOMIC_SEQ_CST);
    3096           0 :         SPDK_DEBUGLOG(rdma, "nvmf_rdma_all_pollers_management_done called. counter: %d, poller: %p\n",
    3097             :                       counter, ctx->rpoller);
    3098             : 
    3099           0 :         if (counter == 0) {
    3100           0 :                 free((void *)ctx->inflight_op_counter);
    3101             :         }
    3102           0 :         free(ctx);
    3103             : 
    3104           0 :         return counter == 0;
    3105             : }
    3106             : 
    3107             : static int
    3108           0 : nvmf_rdma_manage_poller(struct spdk_nvmf_rdma_transport *rtransport,
    3109             :                         struct spdk_nvmf_rdma_device *device, bool *has_inflight, bool is_add)
    3110             : {
    3111             :         struct spdk_nvmf_rdma_poll_group        *rgroup;
    3112             :         struct spdk_nvmf_rdma_poller            *rpoller;
    3113             :         struct spdk_nvmf_poll_group             *poll_group;
    3114             :         struct poller_manage_ctx                *ctx;
    3115             :         bool                                    found;
    3116             :         int                                     *inflight_counter;
    3117             :         spdk_msg_fn                             do_fn;
    3118             : 
    3119           0 :         *has_inflight = false;
    3120           0 :         do_fn = is_add ? _nvmf_rdma_register_poller_in_group : _nvmf_rdma_remove_poller_in_group;
    3121           0 :         inflight_counter = calloc(1, sizeof(int));
    3122           0 :         if (!inflight_counter) {
    3123           0 :                 SPDK_ERRLOG("Failed to allocate inflight counter when removing pollers\n");
    3124           0 :                 return -ENOMEM;
    3125             :         }
    3126             : 
    3127           0 :         TAILQ_FOREACH(rgroup, &rtransport->poll_groups, link) {
    3128           0 :                 (*inflight_counter)++;
    3129             :         }
    3130             : 
    3131           0 :         TAILQ_FOREACH(rgroup, &rtransport->poll_groups, link) {
    3132           0 :                 found = false;
    3133           0 :                 TAILQ_FOREACH(rpoller, &rgroup->pollers, link) {
    3134           0 :                         if (rpoller->device == device) {
    3135           0 :                                 found = true;
    3136           0 :                                 break;
    3137             :                         }
    3138             :                 }
    3139           0 :                 if (found == is_add) {
    3140           0 :                         __atomic_fetch_sub(inflight_counter, 1, __ATOMIC_SEQ_CST);
    3141           0 :                         continue;
    3142             :                 }
    3143             : 
    3144           0 :                 ctx = calloc(1, sizeof(struct poller_manage_ctx));
    3145           0 :                 if (!ctx) {
    3146           0 :                         SPDK_ERRLOG("Failed to allocate poller_manage_ctx when removing pollers\n");
    3147           0 :                         if (!*has_inflight) {
    3148           0 :                                 free(inflight_counter);
    3149             :                         }
    3150           0 :                         return -ENOMEM;
    3151             :                 }
    3152             : 
    3153           0 :                 ctx->rtransport = rtransport;
    3154           0 :                 ctx->rgroup = rgroup;
    3155           0 :                 ctx->rpoller = rpoller;
    3156           0 :                 ctx->device = device;
    3157           0 :                 ctx->thread = spdk_get_thread();
    3158           0 :                 ctx->inflight_op_counter = inflight_counter;
    3159           0 :                 *has_inflight = true;
    3160             : 
    3161           0 :                 poll_group = rgroup->group.group;
    3162           0 :                 if (poll_group->thread != spdk_get_thread()) {
    3163           0 :                         spdk_thread_send_msg(poll_group->thread, do_fn, ctx);
    3164             :                 } else {
    3165           0 :                         do_fn(ctx);
    3166             :                 }
    3167             :         }
    3168             : 
    3169           0 :         if (!*has_inflight) {
    3170           0 :                 free(inflight_counter);
    3171             :         }
    3172             : 
    3173           0 :         return 0;
    3174             : }
    3175             : 
    3176             : static void nvmf_rdma_handle_device_removal(struct spdk_nvmf_rdma_transport *rtransport,
    3177             :                 struct spdk_nvmf_rdma_device *device);
    3178             : 
    3179             : static struct spdk_nvmf_rdma_device *
    3180           0 : nvmf_rdma_find_ib_device(struct spdk_nvmf_rdma_transport *rtransport,
    3181             :                          struct ibv_context *context)
    3182             : {
    3183             :         struct spdk_nvmf_rdma_device    *device, *tmp_device;
    3184             : 
    3185           0 :         TAILQ_FOREACH_SAFE(device, &rtransport->devices, link, tmp_device) {
    3186           0 :                 if (device->need_destroy) {
    3187           0 :                         continue;
    3188             :                 }
    3189             : 
    3190           0 :                 if (strcmp(device->context->device->dev_name, context->device->dev_name) == 0) {
    3191           0 :                         return device;
    3192             :                 }
    3193             :         }
    3194             : 
    3195           0 :         return NULL;
    3196             : }
    3197             : 
    3198             : static bool
    3199           0 : nvmf_rdma_check_devices_context(struct spdk_nvmf_rdma_transport *rtransport,
    3200             :                                 struct ibv_context *context)
    3201             : {
    3202           0 :         struct spdk_nvmf_rdma_device    *old_device, *new_device;
    3203           0 :         int                             rc = 0;
    3204           0 :         bool                            has_inflight;
    3205             : 
    3206           0 :         old_device = nvmf_rdma_find_ib_device(rtransport, context);
    3207             : 
    3208           0 :         if (old_device) {
    3209           0 :                 if (old_device->context != context && !old_device->need_destroy && old_device->is_ready) {
    3210             :                         /* context may not have time to be cleaned when rescan. exactly one context
    3211             :                          * is valid for a device so this context must be invalid and just remove it. */
    3212           0 :                         SPDK_WARNLOG("Device %p has a invalid context %p\n", old_device, old_device->context);
    3213           0 :                         old_device->need_destroy = true;
    3214           0 :                         nvmf_rdma_handle_device_removal(rtransport, old_device);
    3215             :                 }
    3216           0 :                 return false;
    3217             :         }
    3218             : 
    3219           0 :         rc = create_ib_device(rtransport, context, &new_device);
    3220             :         /* TODO: update transport opts. */
    3221           0 :         if (rc < 0) {
    3222           0 :                 SPDK_ERRLOG("Failed to create ib device for context: %s(%p)\n",
    3223             :                             ibv_get_device_name(context->device), context);
    3224           0 :                 return false;
    3225             :         }
    3226             : 
    3227           0 :         rc = nvmf_rdma_manage_poller(rtransport, new_device, &has_inflight, true);
    3228           0 :         if (rc < 0) {
    3229           0 :                 SPDK_ERRLOG("Failed to add poller for device context: %s(%p)\n",
    3230             :                             ibv_get_device_name(context->device), context);
    3231           0 :                 return false;
    3232             :         }
    3233             : 
    3234           0 :         if (has_inflight) {
    3235           0 :                 new_device->is_ready = true;
    3236             :         }
    3237             : 
    3238           0 :         return true;
    3239             : }
    3240             : 
    3241             : static bool
    3242           0 : nvmf_rdma_rescan_devices(struct spdk_nvmf_rdma_transport *rtransport)
    3243             : {
    3244             :         struct spdk_nvmf_rdma_device    *device;
    3245           0 :         struct ibv_device               **ibv_device_list = NULL;
    3246           0 :         struct ibv_context              **contexts = NULL;
    3247           0 :         int                             i = 0;
    3248           0 :         int                             num_dev = 0;
    3249           0 :         bool                            new_create = false, has_new_device = false;
    3250           0 :         struct ibv_context              *tmp_verbs = NULL;
    3251             : 
    3252             :         /* do not rescan when any device is destroying, or context may be freed when
    3253             :          * regenerating the poll fds.
    3254             :          */
    3255           0 :         TAILQ_FOREACH(device, &rtransport->devices, link) {
    3256           0 :                 if (device->need_destroy) {
    3257           0 :                         return false;
    3258             :                 }
    3259             :         }
    3260             : 
    3261           0 :         ibv_device_list = ibv_get_device_list(&num_dev);
    3262             : 
    3263             :         /* There is a bug in librdmacm. If verbs init failed in rdma_get_devices, it'll be
    3264             :          * marked as dead verbs and never be init again. So we need to make sure the
    3265             :          * verbs is available before we call rdma_get_devices. */
    3266           0 :         if (num_dev >= 0) {
    3267           0 :                 for (i = 0; i < num_dev; i++) {
    3268           0 :                         tmp_verbs = ibv_open_device(ibv_device_list[i]);
    3269           0 :                         if (!tmp_verbs) {
    3270           0 :                                 SPDK_WARNLOG("Failed to init ibv device %p, err %d. Skip rescan.\n", ibv_device_list[i], errno);
    3271           0 :                                 break;
    3272             :                         }
    3273           0 :                         if (nvmf_rdma_find_ib_device(rtransport, tmp_verbs) == NULL) {
    3274           0 :                                 SPDK_DEBUGLOG(rdma, "Find new verbs init ibv device %p(%s).\n", ibv_device_list[i],
    3275             :                                               tmp_verbs->device->dev_name);
    3276           0 :                                 has_new_device = true;
    3277             :                         }
    3278           0 :                         ibv_close_device(tmp_verbs);
    3279             :                 }
    3280           0 :                 ibv_free_device_list(ibv_device_list);
    3281           0 :                 if (!tmp_verbs || !has_new_device) {
    3282           0 :                         return false;
    3283             :                 }
    3284             :         }
    3285             : 
    3286           0 :         contexts = rdma_get_devices(NULL);
    3287             : 
    3288           0 :         for (i = 0; contexts && contexts[i] != NULL; i++) {
    3289           0 :                 new_create |= nvmf_rdma_check_devices_context(rtransport, contexts[i]);
    3290             :         }
    3291             : 
    3292           0 :         if (new_create) {
    3293           0 :                 free_poll_fds(rtransport);
    3294           0 :                 generate_poll_fds(rtransport);
    3295             :         }
    3296             : 
    3297           0 :         if (contexts) {
    3298           0 :                 rdma_free_devices(contexts);
    3299             :         }
    3300             : 
    3301           0 :         return new_create;
    3302             : }
    3303             : 
    3304             : static bool
    3305           0 : nvmf_rdma_retry_listen_port(struct spdk_nvmf_rdma_transport *rtransport)
    3306             : {
    3307             :         struct spdk_nvmf_rdma_port      *port, *tmp_port;
    3308           0 :         int                             rc = 0;
    3309           0 :         bool                            new_create = false;
    3310             : 
    3311           0 :         if (TAILQ_EMPTY(&rtransport->retry_ports)) {
    3312           0 :                 return false;
    3313             :         }
    3314             : 
    3315           0 :         new_create = nvmf_rdma_rescan_devices(rtransport);
    3316             : 
    3317           0 :         TAILQ_FOREACH_SAFE(port, &rtransport->retry_ports, link, tmp_port) {
    3318           0 :                 rc = nvmf_rdma_listen(&rtransport->transport, port->trid, NULL);
    3319             : 
    3320           0 :                 TAILQ_REMOVE(&rtransport->retry_ports, port, link);
    3321           0 :                 if (rc) {
    3322           0 :                         if (new_create) {
    3323           0 :                                 SPDK_ERRLOG("Found new IB device but port %s:%s is still failed(%d) to listen.\n",
    3324             :                                             port->trid->traddr, port->trid->trsvcid, rc);
    3325             :                         }
    3326           0 :                         TAILQ_INSERT_TAIL(&rtransport->retry_ports, port, link);
    3327           0 :                         break;
    3328             :                 } else {
    3329           0 :                         SPDK_NOTICELOG("Port %s:%s come back\n", port->trid->traddr, port->trid->trsvcid);
    3330           0 :                         free(port);
    3331             :                 }
    3332             :         }
    3333             : 
    3334           0 :         return true;
    3335             : }
    3336             : 
    3337             : static void
    3338           0 : nvmf_rdma_qpair_process_pending(struct spdk_nvmf_rdma_transport *rtransport,
    3339             :                                 struct spdk_nvmf_rdma_qpair *rqpair, bool drain)
    3340             : {
    3341             :         struct spdk_nvmf_request *req, *tmp;
    3342             :         struct spdk_nvmf_rdma_request   *rdma_req, *req_tmp;
    3343             :         struct spdk_nvmf_rdma_resources *resources;
    3344             : 
    3345             :         /* First process requests which are waiting for response to be sent */
    3346           0 :         STAILQ_FOREACH_SAFE(rdma_req, &rqpair->pending_rdma_send_queue, state_link, req_tmp) {
    3347           0 :                 if (nvmf_rdma_request_process(rtransport, rdma_req) == false && drain == false) {
    3348           0 :                         break;
    3349             :                 }
    3350             :         }
    3351             : 
    3352             :         /* We process I/O in the data transfer pending queue at the highest priority. */
    3353           0 :         STAILQ_FOREACH_SAFE(rdma_req, &rqpair->pending_rdma_read_queue, state_link, req_tmp) {
    3354           0 :                 if (nvmf_rdma_request_process(rtransport, rdma_req) == false && drain == false) {
    3355           0 :                         break;
    3356             :                 }
    3357             :         }
    3358             : 
    3359             :         /* Then RDMA writes since reads have stronger restrictions than writes */
    3360           0 :         STAILQ_FOREACH_SAFE(rdma_req, &rqpair->pending_rdma_write_queue, state_link, req_tmp) {
    3361           0 :                 if (nvmf_rdma_request_process(rtransport, rdma_req) == false && drain == false) {
    3362           0 :                         break;
    3363             :                 }
    3364             :         }
    3365             : 
    3366             :         /* Then we handle request waiting on memory buffers. */
    3367           0 :         STAILQ_FOREACH_SAFE(req, &rqpair->poller->group->group.pending_buf_queue, buf_link, tmp) {
    3368           0 :                 rdma_req = SPDK_CONTAINEROF(req, struct spdk_nvmf_rdma_request, req);
    3369           0 :                 if (nvmf_rdma_request_process(rtransport, rdma_req) == false && drain == false) {
    3370           0 :                         break;
    3371             :                 }
    3372             :         }
    3373             : 
    3374           0 :         resources = rqpair->resources;
    3375           0 :         while (!STAILQ_EMPTY(&resources->free_queue) && !STAILQ_EMPTY(&resources->incoming_queue)) {
    3376           0 :                 rdma_req = STAILQ_FIRST(&resources->free_queue);
    3377           0 :                 STAILQ_REMOVE_HEAD(&resources->free_queue, state_link);
    3378           0 :                 rdma_req->recv = STAILQ_FIRST(&resources->incoming_queue);
    3379           0 :                 STAILQ_REMOVE_HEAD(&resources->incoming_queue, link);
    3380             : 
    3381           0 :                 if (rqpair->srq != NULL) {
    3382           0 :                         rdma_req->req.qpair = &rdma_req->recv->qpair->qpair;
    3383           0 :                         rdma_req->recv->qpair->qd++;
    3384             :                 } else {
    3385           0 :                         rqpair->qd++;
    3386             :                 }
    3387             : 
    3388           0 :                 rdma_req->receive_tsc = rdma_req->recv->receive_tsc;
    3389           0 :                 rdma_req->state = RDMA_REQUEST_STATE_NEW;
    3390           0 :                 if (nvmf_rdma_request_process(rtransport, rdma_req) == false) {
    3391           0 :                         break;
    3392             :                 }
    3393             :         }
    3394           0 :         if (!STAILQ_EMPTY(&resources->incoming_queue) && STAILQ_EMPTY(&resources->free_queue)) {
    3395           0 :                 rqpair->poller->stat.pending_free_request++;
    3396             :         }
    3397           0 : }
    3398             : 
    3399             : static void
    3400           0 : nvmf_rdma_poller_process_pending_buf_queue(struct spdk_nvmf_rdma_transport *rtransport,
    3401             :                 struct spdk_nvmf_rdma_poller *rpoller)
    3402             : {
    3403             :         struct spdk_nvmf_request *req, *tmp;
    3404             :         struct spdk_nvmf_rdma_request *rdma_req;
    3405             : 
    3406           0 :         STAILQ_FOREACH_SAFE(req, &rpoller->group->group.pending_buf_queue, buf_link, tmp) {
    3407           0 :                 rdma_req = SPDK_CONTAINEROF(req, struct spdk_nvmf_rdma_request, req);
    3408           0 :                 if (nvmf_rdma_request_process(rtransport, rdma_req) == false) {
    3409           0 :                         break;
    3410             :                 }
    3411             :         }
    3412           0 : }
    3413             : 
    3414             : static inline bool
    3415           0 : nvmf_rdma_can_ignore_last_wqe_reached(struct spdk_nvmf_rdma_device *device)
    3416             : {
    3417             :         /* iWARP transport and SoftRoCE driver don't support LAST_WQE_REACHED ibv async event */
    3418           0 :         return nvmf_rdma_is_rxe_device(device) ||
    3419           0 :                device->context->device->transport_type == IBV_TRANSPORT_IWARP;
    3420             : }
    3421             : 
    3422             : static void
    3423           0 : nvmf_rdma_destroy_drained_qpair(struct spdk_nvmf_rdma_qpair *rqpair)
    3424             : {
    3425           0 :         struct spdk_nvmf_rdma_transport *rtransport = SPDK_CONTAINEROF(rqpair->qpair.transport,
    3426             :                         struct spdk_nvmf_rdma_transport, transport);
    3427             : 
    3428           0 :         nvmf_rdma_qpair_process_pending(rtransport, rqpair, true);
    3429             : 
    3430             :         /* nvmf_rdma_close_qpair is not called */
    3431           0 :         if (!rqpair->to_close) {
    3432           0 :                 return;
    3433             :         }
    3434             : 
    3435             :         /* device is already destroyed and we should force destroy this qpair. */
    3436           0 :         if (rqpair->poller && rqpair->poller->need_destroy) {
    3437           0 :                 nvmf_rdma_qpair_destroy(rqpair);
    3438           0 :                 return;
    3439             :         }
    3440             : 
    3441             :         /* In non SRQ path, we will reach rqpair->max_queue_depth. In SRQ path, we will get the last_wqe event. */
    3442           0 :         if (rqpair->current_send_depth != 0) {
    3443           0 :                 return;
    3444             :         }
    3445             : 
    3446           0 :         if (rqpair->srq == NULL && rqpair->current_recv_depth != rqpair->max_queue_depth) {
    3447           0 :                 return;
    3448             :         }
    3449             : 
    3450           0 :         if (rqpair->srq != NULL && rqpair->last_wqe_reached == false &&
    3451           0 :             !nvmf_rdma_can_ignore_last_wqe_reached(rqpair->device)) {
    3452           0 :                 return;
    3453             :         }
    3454             : 
    3455           0 :         assert(rqpair->qpair.state == SPDK_NVMF_QPAIR_ERROR);
    3456             : 
    3457           0 :         nvmf_rdma_qpair_destroy(rqpair);
    3458             : }
    3459             : 
    3460             : static int
    3461           0 : nvmf_rdma_disconnect(struct rdma_cm_event *evt, bool *event_acked)
    3462             : {
    3463             :         struct spdk_nvmf_qpair          *qpair;
    3464             :         struct spdk_nvmf_rdma_qpair     *rqpair;
    3465             : 
    3466           0 :         if (evt->id == NULL) {
    3467           0 :                 SPDK_ERRLOG("disconnect request: missing cm_id\n");
    3468           0 :                 return -1;
    3469             :         }
    3470             : 
    3471           0 :         qpair = evt->id->context;
    3472           0 :         if (qpair == NULL) {
    3473           0 :                 SPDK_ERRLOG("disconnect request: no active connection\n");
    3474           0 :                 return -1;
    3475             :         }
    3476             : 
    3477           0 :         rdma_ack_cm_event(evt);
    3478           0 :         *event_acked = true;
    3479             : 
    3480           0 :         rqpair = SPDK_CONTAINEROF(qpair, struct spdk_nvmf_rdma_qpair, qpair);
    3481             : 
    3482           0 :         spdk_trace_record(TRACE_RDMA_QP_DISCONNECT, 0, 0, (uintptr_t)rqpair);
    3483             : 
    3484           0 :         spdk_nvmf_qpair_disconnect(&rqpair->qpair);
    3485             : 
    3486           0 :         return 0;
    3487             : }
    3488             : 
    3489             : #ifdef DEBUG
    3490             : static const char *CM_EVENT_STR[] = {
    3491             :         "RDMA_CM_EVENT_ADDR_RESOLVED",
    3492             :         "RDMA_CM_EVENT_ADDR_ERROR",
    3493             :         "RDMA_CM_EVENT_ROUTE_RESOLVED",
    3494             :         "RDMA_CM_EVENT_ROUTE_ERROR",
    3495             :         "RDMA_CM_EVENT_CONNECT_REQUEST",
    3496             :         "RDMA_CM_EVENT_CONNECT_RESPONSE",
    3497             :         "RDMA_CM_EVENT_CONNECT_ERROR",
    3498             :         "RDMA_CM_EVENT_UNREACHABLE",
    3499             :         "RDMA_CM_EVENT_REJECTED",
    3500             :         "RDMA_CM_EVENT_ESTABLISHED",
    3501             :         "RDMA_CM_EVENT_DISCONNECTED",
    3502             :         "RDMA_CM_EVENT_DEVICE_REMOVAL",
    3503             :         "RDMA_CM_EVENT_MULTICAST_JOIN",
    3504             :         "RDMA_CM_EVENT_MULTICAST_ERROR",
    3505             :         "RDMA_CM_EVENT_ADDR_CHANGE",
    3506             :         "RDMA_CM_EVENT_TIMEWAIT_EXIT"
    3507             : };
    3508             : #endif /* DEBUG */
    3509             : 
    3510             : static void
    3511           0 : nvmf_rdma_disconnect_qpairs_on_port(struct spdk_nvmf_rdma_transport *rtransport,
    3512             :                                     struct spdk_nvmf_rdma_port *port)
    3513             : {
    3514             :         struct spdk_nvmf_rdma_poll_group        *rgroup;
    3515             :         struct spdk_nvmf_rdma_poller            *rpoller;
    3516             :         struct spdk_nvmf_rdma_qpair             *rqpair;
    3517             : 
    3518           0 :         TAILQ_FOREACH(rgroup, &rtransport->poll_groups, link) {
    3519           0 :                 TAILQ_FOREACH(rpoller, &rgroup->pollers, link) {
    3520           0 :                         RB_FOREACH(rqpair, qpairs_tree, &rpoller->qpairs) {
    3521           0 :                                 if (rqpair->listen_id == port->id) {
    3522           0 :                                         spdk_nvmf_qpair_disconnect(&rqpair->qpair);
    3523             :                                 }
    3524             :                         }
    3525             :                 }
    3526             :         }
    3527           0 : }
    3528             : 
    3529             : static bool
    3530           0 : nvmf_rdma_handle_cm_event_addr_change(struct spdk_nvmf_transport *transport,
    3531             :                                       struct rdma_cm_event *event)
    3532             : {
    3533             :         const struct spdk_nvme_transport_id     *trid;
    3534             :         struct spdk_nvmf_rdma_port              *port;
    3535             :         struct spdk_nvmf_rdma_transport         *rtransport;
    3536           0 :         bool                                    event_acked = false;
    3537             : 
    3538           0 :         rtransport = SPDK_CONTAINEROF(transport, struct spdk_nvmf_rdma_transport, transport);
    3539           0 :         TAILQ_FOREACH(port, &rtransport->ports, link) {
    3540           0 :                 if (port->id == event->id) {
    3541           0 :                         SPDK_ERRLOG("ADDR_CHANGE: IP %s:%s migrated\n", port->trid->traddr, port->trid->trsvcid);
    3542           0 :                         rdma_ack_cm_event(event);
    3543           0 :                         event_acked = true;
    3544           0 :                         trid = port->trid;
    3545           0 :                         break;
    3546             :                 }
    3547             :         }
    3548             : 
    3549           0 :         if (event_acked) {
    3550           0 :                 nvmf_rdma_disconnect_qpairs_on_port(rtransport, port);
    3551             : 
    3552           0 :                 nvmf_rdma_stop_listen(transport, trid);
    3553           0 :                 nvmf_rdma_listen(transport, trid, NULL);
    3554             :         }
    3555             : 
    3556           0 :         return event_acked;
    3557             : }
    3558             : 
    3559             : static void
    3560           0 : nvmf_rdma_handle_device_removal(struct spdk_nvmf_rdma_transport *rtransport,
    3561             :                                 struct spdk_nvmf_rdma_device *device)
    3562             : {
    3563             :         struct spdk_nvmf_rdma_port      *port, *port_tmp;
    3564             :         int                             rc;
    3565           0 :         bool                            has_inflight;
    3566             : 
    3567           0 :         rc = nvmf_rdma_manage_poller(rtransport, device, &has_inflight, false);
    3568           0 :         if (rc) {
    3569           0 :                 SPDK_ERRLOG("Failed to handle device removal, rc %d\n", rc);
    3570           0 :                 return;
    3571             :         }
    3572             : 
    3573           0 :         if (!has_inflight) {
    3574             :                 /* no pollers, destroy the device */
    3575           0 :                 device->ready_to_destroy = true;
    3576           0 :                 spdk_thread_send_msg(spdk_get_thread(), _nvmf_rdma_remove_destroyed_device, rtransport);
    3577             :         }
    3578             : 
    3579           0 :         TAILQ_FOREACH_SAFE(port, &rtransport->ports, link, port_tmp) {
    3580           0 :                 if (port->device == device) {
    3581           0 :                         SPDK_NOTICELOG("Port %s:%s on device %s is being removed.\n",
    3582             :                                        port->trid->traddr,
    3583             :                                        port->trid->trsvcid,
    3584             :                                        ibv_get_device_name(port->device->context->device));
    3585             : 
    3586             :                         /* keep NVMF listener and only destroy structures of the
    3587             :                          * RDMA transport. when the device comes back we can retry listening
    3588             :                          * and the application's workflow will not be interrupted.
    3589             :                          */
    3590           0 :                         nvmf_rdma_stop_listen_ex(&rtransport->transport, port->trid, true);
    3591             :                 }
    3592             :         }
    3593             : }
    3594             : 
    3595             : static void
    3596           0 : nvmf_rdma_handle_cm_event_port_removal(struct spdk_nvmf_transport *transport,
    3597             :                                        struct rdma_cm_event *event)
    3598             : {
    3599             :         struct spdk_nvmf_rdma_port              *port, *tmp_port;
    3600             :         struct spdk_nvmf_rdma_transport         *rtransport;
    3601             : 
    3602           0 :         port = event->id->context;
    3603           0 :         rtransport = SPDK_CONTAINEROF(transport, struct spdk_nvmf_rdma_transport, transport);
    3604             : 
    3605           0 :         rdma_ack_cm_event(event);
    3606             : 
    3607             :         /* if device removal happens during ctrl qpair disconnecting, it's possible that we receive
    3608             :          * an DEVICE_REMOVAL event on qpair but the id->qp is just NULL. So we should make sure that
    3609             :          * we are handling a port event here.
    3610             :          */
    3611           0 :         TAILQ_FOREACH(tmp_port, &rtransport->ports, link) {
    3612           0 :                 if (port == tmp_port && port->device && !port->device->need_destroy) {
    3613           0 :                         port->device->need_destroy = true;
    3614           0 :                         nvmf_rdma_handle_device_removal(rtransport, port->device);
    3615             :                 }
    3616             :         }
    3617           0 : }
    3618             : 
    3619             : static void
    3620           0 : nvmf_process_cm_events(struct spdk_nvmf_transport *transport, uint32_t max_events)
    3621             : {
    3622             :         struct spdk_nvmf_rdma_transport *rtransport;
    3623           0 :         struct rdma_cm_event            *event;
    3624             :         uint32_t                        i;
    3625             :         int                             rc;
    3626           0 :         bool                            event_acked;
    3627             : 
    3628           0 :         rtransport = SPDK_CONTAINEROF(transport, struct spdk_nvmf_rdma_transport, transport);
    3629             : 
    3630           0 :         if (rtransport->event_channel == NULL) {
    3631           0 :                 return;
    3632             :         }
    3633             : 
    3634           0 :         for (i = 0; i < max_events; i++) {
    3635           0 :                 event_acked = false;
    3636           0 :                 rc = rdma_get_cm_event(rtransport->event_channel, &event);
    3637           0 :                 if (rc) {
    3638           0 :                         if (errno != EAGAIN && errno != EWOULDBLOCK) {
    3639           0 :                                 SPDK_ERRLOG("Acceptor Event Error: %s\n", spdk_strerror(errno));
    3640             :                         }
    3641           0 :                         break;
    3642             :                 }
    3643             : 
    3644           0 :                 SPDK_DEBUGLOG(rdma, "Acceptor Event: %s\n", CM_EVENT_STR[event->event]);
    3645             : 
    3646           0 :                 spdk_trace_record(TRACE_RDMA_CM_ASYNC_EVENT, 0, 0, 0, event->event);
    3647             : 
    3648           0 :                 switch (event->event) {
    3649           0 :                 case RDMA_CM_EVENT_ADDR_RESOLVED:
    3650             :                 case RDMA_CM_EVENT_ADDR_ERROR:
    3651             :                 case RDMA_CM_EVENT_ROUTE_RESOLVED:
    3652             :                 case RDMA_CM_EVENT_ROUTE_ERROR:
    3653             :                         /* No action required. The target never attempts to resolve routes. */
    3654           0 :                         break;
    3655           0 :                 case RDMA_CM_EVENT_CONNECT_REQUEST:
    3656           0 :                         rc = nvmf_rdma_connect(transport, event);
    3657           0 :                         if (rc < 0) {
    3658           0 :                                 SPDK_ERRLOG("Unable to process connect event. rc: %d\n", rc);
    3659           0 :                                 break;
    3660             :                         }
    3661           0 :                         break;
    3662           0 :                 case RDMA_CM_EVENT_CONNECT_RESPONSE:
    3663             :                         /* The target never initiates a new connection. So this will not occur. */
    3664           0 :                         break;
    3665           0 :                 case RDMA_CM_EVENT_CONNECT_ERROR:
    3666             :                         /* Can this happen? The docs say it can, but not sure what causes it. */
    3667           0 :                         break;
    3668           0 :                 case RDMA_CM_EVENT_UNREACHABLE:
    3669             :                 case RDMA_CM_EVENT_REJECTED:
    3670             :                         /* These only occur on the client side. */
    3671           0 :                         break;
    3672           0 :                 case RDMA_CM_EVENT_ESTABLISHED:
    3673             :                         /* TODO: Should we be waiting for this event anywhere? */
    3674           0 :                         break;
    3675           0 :                 case RDMA_CM_EVENT_DISCONNECTED:
    3676           0 :                         rc = nvmf_rdma_disconnect(event, &event_acked);
    3677           0 :                         if (rc < 0) {
    3678           0 :                                 SPDK_ERRLOG("Unable to process disconnect event. rc: %d\n", rc);
    3679           0 :                                 break;
    3680             :                         }
    3681           0 :                         break;
    3682           0 :                 case RDMA_CM_EVENT_DEVICE_REMOVAL:
    3683             :                         /* In case of device removal, kernel IB part triggers IBV_EVENT_DEVICE_FATAL
    3684             :                          * which triggers RDMA_CM_EVENT_DEVICE_REMOVAL on all cma_id’s.
    3685             :                          * Once these events are sent to SPDK, we should release all IB resources and
    3686             :                          * don't make attempts to call any ibv_query/modify/create functions. We can only call
    3687             :                          * ibv_destroy* functions to release user space memory allocated by IB. All kernel
    3688             :                          * resources are already cleaned. */
    3689           0 :                         if (event->id->qp) {
    3690             :                                 /* If rdma_cm event has a valid `qp` pointer then the event refers to the
    3691             :                                  * corresponding qpair. Otherwise the event refers to a listening device. */
    3692           0 :                                 rc = nvmf_rdma_disconnect(event, &event_acked);
    3693           0 :                                 if (rc < 0) {
    3694           0 :                                         SPDK_ERRLOG("Unable to process disconnect event. rc: %d\n", rc);
    3695           0 :                                         break;
    3696             :                                 }
    3697             :                         } else {
    3698           0 :                                 nvmf_rdma_handle_cm_event_port_removal(transport, event);
    3699           0 :                                 event_acked = true;
    3700             :                         }
    3701           0 :                         break;
    3702           0 :                 case RDMA_CM_EVENT_MULTICAST_JOIN:
    3703             :                 case RDMA_CM_EVENT_MULTICAST_ERROR:
    3704             :                         /* Multicast is not used */
    3705           0 :                         break;
    3706           0 :                 case RDMA_CM_EVENT_ADDR_CHANGE:
    3707           0 :                         event_acked = nvmf_rdma_handle_cm_event_addr_change(transport, event);
    3708           0 :                         break;
    3709           0 :                 case RDMA_CM_EVENT_TIMEWAIT_EXIT:
    3710             :                         /* For now, do nothing. The target never re-uses queue pairs. */
    3711           0 :                         break;
    3712           0 :                 default:
    3713           0 :                         SPDK_ERRLOG("Unexpected Acceptor Event [%d]\n", event->event);
    3714           0 :                         break;
    3715             :                 }
    3716           0 :                 if (!event_acked) {
    3717           0 :                         rdma_ack_cm_event(event);
    3718             :                 }
    3719             :         }
    3720             : }
    3721             : 
    3722             : static void
    3723           0 : nvmf_rdma_handle_last_wqe_reached(struct spdk_nvmf_rdma_qpair *rqpair)
    3724             : {
    3725           0 :         rqpair->last_wqe_reached = true;
    3726           0 :         nvmf_rdma_destroy_drained_qpair(rqpair);
    3727           0 : }
    3728             : 
    3729             : static void
    3730           0 : nvmf_rdma_qpair_process_ibv_event(void *ctx)
    3731             : {
    3732           0 :         struct spdk_nvmf_rdma_ibv_event_ctx *event_ctx = ctx;
    3733             : 
    3734           0 :         if (event_ctx->rqpair) {
    3735           0 :                 STAILQ_REMOVE(&event_ctx->rqpair->ibv_events, event_ctx, spdk_nvmf_rdma_ibv_event_ctx, link);
    3736           0 :                 if (event_ctx->cb_fn) {
    3737           0 :                         event_ctx->cb_fn(event_ctx->rqpair);
    3738             :                 }
    3739             :         }
    3740           0 :         free(event_ctx);
    3741           0 : }
    3742             : 
    3743             : static int
    3744           0 : nvmf_rdma_send_qpair_async_event(struct spdk_nvmf_rdma_qpair *rqpair,
    3745             :                                  spdk_nvmf_rdma_qpair_ibv_event fn)
    3746             : {
    3747             :         struct spdk_nvmf_rdma_ibv_event_ctx *ctx;
    3748           0 :         struct spdk_thread *thr = NULL;
    3749             :         int rc;
    3750             : 
    3751           0 :         if (rqpair->qpair.group) {
    3752           0 :                 thr = rqpair->qpair.group->thread;
    3753           0 :         } else if (rqpair->destruct_channel) {
    3754           0 :                 thr = spdk_io_channel_get_thread(rqpair->destruct_channel);
    3755             :         }
    3756             : 
    3757           0 :         if (!thr) {
    3758           0 :                 SPDK_DEBUGLOG(rdma, "rqpair %p has no thread\n", rqpair);
    3759           0 :                 return -EINVAL;
    3760             :         }
    3761             : 
    3762           0 :         ctx = calloc(1, sizeof(*ctx));
    3763           0 :         if (!ctx) {
    3764           0 :                 return -ENOMEM;
    3765             :         }
    3766             : 
    3767           0 :         ctx->rqpair = rqpair;
    3768           0 :         ctx->cb_fn = fn;
    3769           0 :         STAILQ_INSERT_TAIL(&rqpair->ibv_events, ctx, link);
    3770             : 
    3771           0 :         rc = spdk_thread_send_msg(thr, nvmf_rdma_qpair_process_ibv_event, ctx);
    3772           0 :         if (rc) {
    3773           0 :                 STAILQ_REMOVE(&rqpair->ibv_events, ctx, spdk_nvmf_rdma_ibv_event_ctx, link);
    3774           0 :                 free(ctx);
    3775             :         }
    3776             : 
    3777           0 :         return rc;
    3778             : }
    3779             : 
    3780             : static int
    3781           0 : nvmf_process_ib_event(struct spdk_nvmf_rdma_device *device)
    3782             : {
    3783             :         int                             rc;
    3784           0 :         struct spdk_nvmf_rdma_qpair     *rqpair = NULL;
    3785           0 :         struct ibv_async_event          event;
    3786             : 
    3787           0 :         rc = ibv_get_async_event(device->context, &event);
    3788             : 
    3789           0 :         if (rc) {
    3790             :                 /* In non-blocking mode -1 means there are no events available */
    3791           0 :                 return rc;
    3792             :         }
    3793             : 
    3794           0 :         switch (event.event_type) {
    3795           0 :         case IBV_EVENT_QP_FATAL:
    3796             :         case IBV_EVENT_QP_LAST_WQE_REACHED:
    3797             :         case IBV_EVENT_QP_REQ_ERR:
    3798             :         case IBV_EVENT_QP_ACCESS_ERR:
    3799             :         case IBV_EVENT_COMM_EST:
    3800             :         case IBV_EVENT_PATH_MIG:
    3801             :         case IBV_EVENT_PATH_MIG_ERR:
    3802           0 :                 rqpair = event.element.qp->qp_context;
    3803           0 :                 if (!rqpair) {
    3804             :                         /* Any QP event for NVMe-RDMA initiator may be returned. */
    3805           0 :                         SPDK_NOTICELOG("Async QP event for unknown QP: %s\n",
    3806             :                                        ibv_event_type_str(event.event_type));
    3807           0 :                         break;
    3808             :                 }
    3809             : 
    3810           0 :                 switch (event.event_type) {
    3811           0 :                 case IBV_EVENT_QP_FATAL:
    3812           0 :                         SPDK_ERRLOG("Fatal event received for rqpair %p\n", rqpair);
    3813           0 :                         spdk_trace_record(TRACE_RDMA_IBV_ASYNC_EVENT, 0, 0,
    3814             :                                           (uintptr_t)rqpair, event.event_type);
    3815           0 :                         rqpair->ibv_in_error_state = true;
    3816           0 :                         spdk_nvmf_qpair_disconnect(&rqpair->qpair);
    3817           0 :                         break;
    3818           0 :                 case IBV_EVENT_QP_LAST_WQE_REACHED:
    3819             :                         /* This event only occurs for shared receive queues. */
    3820           0 :                         SPDK_DEBUGLOG(rdma, "Last WQE reached event received for rqpair %p\n", rqpair);
    3821           0 :                         rc = nvmf_rdma_send_qpair_async_event(rqpair, nvmf_rdma_handle_last_wqe_reached);
    3822           0 :                         if (rc) {
    3823           0 :                                 SPDK_WARNLOG("Failed to send LAST_WQE_REACHED event. rqpair %p, err %d\n", rqpair, rc);
    3824           0 :                                 rqpair->last_wqe_reached = true;
    3825             :                         }
    3826           0 :                         break;
    3827           0 :                 case IBV_EVENT_QP_REQ_ERR:
    3828             :                 case IBV_EVENT_QP_ACCESS_ERR:
    3829             :                 case IBV_EVENT_COMM_EST:
    3830             :                 case IBV_EVENT_PATH_MIG:
    3831             :                 case IBV_EVENT_PATH_MIG_ERR:
    3832           0 :                         SPDK_NOTICELOG("Async QP event: %s\n",
    3833             :                                        ibv_event_type_str(event.event_type));
    3834           0 :                         spdk_trace_record(TRACE_RDMA_IBV_ASYNC_EVENT, 0, 0,
    3835             :                                           (uintptr_t)rqpair, event.event_type);
    3836           0 :                         rqpair->ibv_in_error_state = true;
    3837           0 :                         break;
    3838           0 :                 default:
    3839           0 :                         break;
    3840             :                 }
    3841           0 :                 break;
    3842           0 :         case IBV_EVENT_DEVICE_FATAL:
    3843           0 :                 SPDK_ERRLOG("Device Fatal event[%s] received on %s. device: %p\n",
    3844             :                             ibv_event_type_str(event.event_type), ibv_get_device_name(device->context->device), device);
    3845           0 :                 device->need_destroy = true;
    3846           0 :                 break;
    3847           0 :         case IBV_EVENT_CQ_ERR:
    3848             :         case IBV_EVENT_PORT_ACTIVE:
    3849             :         case IBV_EVENT_PORT_ERR:
    3850             :         case IBV_EVENT_LID_CHANGE:
    3851             :         case IBV_EVENT_PKEY_CHANGE:
    3852             :         case IBV_EVENT_SM_CHANGE:
    3853             :         case IBV_EVENT_SRQ_ERR:
    3854             :         case IBV_EVENT_SRQ_LIMIT_REACHED:
    3855             :         case IBV_EVENT_CLIENT_REREGISTER:
    3856             :         case IBV_EVENT_GID_CHANGE:
    3857             :         case IBV_EVENT_SQ_DRAINED:
    3858             :         default:
    3859           0 :                 SPDK_NOTICELOG("Async event: %s\n",
    3860             :                                ibv_event_type_str(event.event_type));
    3861           0 :                 spdk_trace_record(TRACE_RDMA_IBV_ASYNC_EVENT, 0, 0, 0, event.event_type);
    3862           0 :                 break;
    3863             :         }
    3864           0 :         ibv_ack_async_event(&event);
    3865             : 
    3866           0 :         return 0;
    3867             : }
    3868             : 
    3869             : static void
    3870           0 : nvmf_process_ib_events(struct spdk_nvmf_rdma_device *device, uint32_t max_events)
    3871             : {
    3872           0 :         int rc = 0;
    3873           0 :         uint32_t i = 0;
    3874             : 
    3875           0 :         for (i = 0; i < max_events; i++) {
    3876           0 :                 rc = nvmf_process_ib_event(device);
    3877           0 :                 if (rc) {
    3878           0 :                         break;
    3879             :                 }
    3880             :         }
    3881             : 
    3882           0 :         SPDK_DEBUGLOG(rdma, "Device %s: %u events processed\n", device->context->device->name, i);
    3883           0 : }
    3884             : 
    3885             : static int
    3886           0 : nvmf_rdma_accept(void *ctx)
    3887             : {
    3888           0 :         int     nfds, i = 0;
    3889           0 :         struct spdk_nvmf_transport *transport = ctx;
    3890             :         struct spdk_nvmf_rdma_transport *rtransport;
    3891             :         struct spdk_nvmf_rdma_device *device, *tmp;
    3892             :         uint32_t count;
    3893             :         short revents;
    3894             :         bool do_retry;
    3895             : 
    3896           0 :         rtransport = SPDK_CONTAINEROF(transport, struct spdk_nvmf_rdma_transport, transport);
    3897           0 :         do_retry = nvmf_rdma_retry_listen_port(rtransport);
    3898             : 
    3899           0 :         count = nfds = poll(rtransport->poll_fds, rtransport->npoll_fds, 0);
    3900             : 
    3901           0 :         if (nfds <= 0) {
    3902           0 :                 return do_retry ? SPDK_POLLER_BUSY : SPDK_POLLER_IDLE;
    3903             :         }
    3904             : 
    3905             :         /* The first poll descriptor is RDMA CM event */
    3906           0 :         if (rtransport->poll_fds[i++].revents & POLLIN) {
    3907           0 :                 nvmf_process_cm_events(transport, NVMF_RDMA_MAX_EVENTS_PER_POLL);
    3908           0 :                 nfds--;
    3909             :         }
    3910             : 
    3911           0 :         if (nfds == 0) {
    3912           0 :                 return SPDK_POLLER_BUSY;
    3913             :         }
    3914             : 
    3915             :         /* Second and subsequent poll descriptors are IB async events */
    3916           0 :         TAILQ_FOREACH_SAFE(device, &rtransport->devices, link, tmp) {
    3917           0 :                 revents = rtransport->poll_fds[i++].revents;
    3918           0 :                 if (revents & POLLIN) {
    3919           0 :                         if (spdk_likely(!device->need_destroy)) {
    3920           0 :                                 nvmf_process_ib_events(device, NVMF_RDMA_MAX_EVENTS_PER_POLL);
    3921           0 :                                 if (spdk_unlikely(device->need_destroy)) {
    3922           0 :                                         nvmf_rdma_handle_device_removal(rtransport, device);
    3923             :                                 }
    3924             :                         }
    3925           0 :                         nfds--;
    3926           0 :                 } else if (revents & POLLNVAL || revents & POLLHUP) {
    3927           0 :                         SPDK_ERRLOG("Receive unknown revent %x on device %p\n", (int)revents, device);
    3928           0 :                         nfds--;
    3929             :                 }
    3930             :         }
    3931             :         /* check all flagged fd's have been served */
    3932           0 :         assert(nfds == 0);
    3933             : 
    3934           0 :         return count > 0 ? SPDK_POLLER_BUSY : SPDK_POLLER_IDLE;
    3935             : }
    3936             : 
    3937             : static void
    3938           0 : nvmf_rdma_cdata_init(struct spdk_nvmf_transport *transport, struct spdk_nvmf_subsystem *subsystem,
    3939             :                      struct spdk_nvmf_ctrlr_data *cdata)
    3940             : {
    3941           0 :         cdata->nvmf_specific.msdbd = NVMF_DEFAULT_MSDBD;
    3942             : 
    3943             :         /* Disable in-capsule data transfer for RDMA controller when dif_insert_or_strip is enabled
    3944             :         since in-capsule data only works with NVME drives that support SGL memory layout */
    3945           0 :         if (transport->opts.dif_insert_or_strip) {
    3946           0 :                 cdata->nvmf_specific.ioccsz = sizeof(struct spdk_nvme_cmd) / 16;
    3947             :         }
    3948             : 
    3949           0 :         if (cdata->nvmf_specific.ioccsz > ((sizeof(struct spdk_nvme_cmd) + 0x1000) / 16)) {
    3950           0 :                 SPDK_WARNLOG("RDMA is configured to support up to 16 SGL entries while in capsule"
    3951             :                              " data is greater than 4KiB.\n");
    3952           0 :                 SPDK_WARNLOG("When used in conjunction with the NVMe-oF initiator from the Linux "
    3953             :                              "kernel between versions 5.4 and 5.12 data corruption may occur for "
    3954             :                              "writes that are not a multiple of 4KiB in size.\n");
    3955             :         }
    3956           0 : }
    3957             : 
    3958             : static void
    3959           0 : nvmf_rdma_discover(struct spdk_nvmf_transport *transport,
    3960             :                    struct spdk_nvme_transport_id *trid,
    3961             :                    struct spdk_nvmf_discovery_log_page_entry *entry)
    3962             : {
    3963           0 :         entry->trtype = SPDK_NVMF_TRTYPE_RDMA;
    3964           0 :         entry->adrfam = trid->adrfam;
    3965           0 :         entry->treq.secure_channel = SPDK_NVMF_TREQ_SECURE_CHANNEL_NOT_REQUIRED;
    3966             : 
    3967           0 :         spdk_strcpy_pad(entry->trsvcid, trid->trsvcid, sizeof(entry->trsvcid), ' ');
    3968           0 :         spdk_strcpy_pad(entry->traddr, trid->traddr, sizeof(entry->traddr), ' ');
    3969             : 
    3970           0 :         entry->tsas.rdma.rdma_qptype = SPDK_NVMF_RDMA_QPTYPE_RELIABLE_CONNECTED;
    3971           0 :         entry->tsas.rdma.rdma_prtype = SPDK_NVMF_RDMA_PRTYPE_NONE;
    3972           0 :         entry->tsas.rdma.rdma_cms = SPDK_NVMF_RDMA_CMS_RDMA_CM;
    3973           0 : }
    3974             : 
    3975             : static int
    3976           0 : nvmf_rdma_poller_create(struct spdk_nvmf_rdma_transport *rtransport,
    3977             :                         struct spdk_nvmf_rdma_poll_group *rgroup, struct spdk_nvmf_rdma_device *device,
    3978             :                         struct spdk_nvmf_rdma_poller **out_poller)
    3979             : {
    3980             :         struct spdk_nvmf_rdma_poller            *poller;
    3981           0 :         struct spdk_rdma_provider_srq_init_attr srq_init_attr;
    3982           0 :         struct spdk_nvmf_rdma_resource_opts     opts;
    3983             :         int                                     num_cqe;
    3984             : 
    3985           0 :         poller = calloc(1, sizeof(*poller));
    3986           0 :         if (!poller) {
    3987           0 :                 SPDK_ERRLOG("Unable to allocate memory for new RDMA poller\n");
    3988           0 :                 return -1;
    3989             :         }
    3990             : 
    3991           0 :         poller->device = device;
    3992           0 :         poller->group = rgroup;
    3993           0 :         *out_poller = poller;
    3994             : 
    3995           0 :         RB_INIT(&poller->qpairs);
    3996           0 :         STAILQ_INIT(&poller->qpairs_pending_send);
    3997           0 :         STAILQ_INIT(&poller->qpairs_pending_recv);
    3998             : 
    3999           0 :         TAILQ_INSERT_TAIL(&rgroup->pollers, poller, link);
    4000           0 :         SPDK_DEBUGLOG(rdma, "Create poller %p on device %p in poll group %p.\n", poller, device, rgroup);
    4001           0 :         if (rtransport->rdma_opts.no_srq == false && device->num_srq < device->attr.max_srq) {
    4002           0 :                 if ((int)rtransport->rdma_opts.max_srq_depth > device->attr.max_srq_wr) {
    4003           0 :                         SPDK_WARNLOG("Requested SRQ depth %u, max supported by dev %s is %d\n",
    4004             :                                      rtransport->rdma_opts.max_srq_depth, device->context->device->name, device->attr.max_srq_wr);
    4005             :                 }
    4006           0 :                 poller->max_srq_depth = spdk_min((int)rtransport->rdma_opts.max_srq_depth, device->attr.max_srq_wr);
    4007             : 
    4008           0 :                 device->num_srq++;
    4009           0 :                 memset(&srq_init_attr, 0, sizeof(srq_init_attr));
    4010           0 :                 srq_init_attr.pd = device->pd;
    4011           0 :                 srq_init_attr.stats = &poller->stat.qp_stats.recv;
    4012           0 :                 srq_init_attr.srq_init_attr.attr.max_wr = poller->max_srq_depth;
    4013           0 :                 srq_init_attr.srq_init_attr.attr.max_sge = spdk_min(device->attr.max_sge, NVMF_DEFAULT_RX_SGE);
    4014           0 :                 poller->srq = spdk_rdma_provider_srq_create(&srq_init_attr);
    4015           0 :                 if (!poller->srq) {
    4016           0 :                         SPDK_ERRLOG("Unable to create shared receive queue, errno %d\n", errno);
    4017           0 :                         return -1;
    4018             :                 }
    4019             : 
    4020           0 :                 opts.qp = poller->srq;
    4021           0 :                 opts.map = device->map;
    4022           0 :                 opts.qpair = NULL;
    4023           0 :                 opts.shared = true;
    4024           0 :                 opts.max_queue_depth = poller->max_srq_depth;
    4025           0 :                 opts.in_capsule_data_size = rtransport->transport.opts.in_capsule_data_size;
    4026             : 
    4027           0 :                 poller->resources = nvmf_rdma_resources_create(&opts);
    4028           0 :                 if (!poller->resources) {
    4029           0 :                         SPDK_ERRLOG("Unable to allocate resources for shared receive queue.\n");
    4030           0 :                         return -1;
    4031             :                 }
    4032             :         }
    4033             : 
    4034             :         /*
    4035             :          * When using an srq, we can limit the completion queue at startup.
    4036             :          * The following formula represents the calculation:
    4037             :          * num_cqe = num_recv + num_data_wr + num_send_wr.
    4038             :          * where num_recv=num_data_wr=and num_send_wr=poller->max_srq_depth
    4039             :          */
    4040           0 :         if (poller->srq) {
    4041           0 :                 num_cqe = poller->max_srq_depth * 3;
    4042             :         } else {
    4043           0 :                 num_cqe = rtransport->rdma_opts.num_cqe;
    4044             :         }
    4045             : 
    4046           0 :         poller->cq = ibv_create_cq(device->context, num_cqe, poller, NULL, 0);
    4047           0 :         if (!poller->cq) {
    4048           0 :                 SPDK_ERRLOG("Unable to create completion queue\n");
    4049           0 :                 return -1;
    4050             :         }
    4051           0 :         poller->num_cqe = num_cqe;
    4052           0 :         return 0;
    4053             : }
    4054             : 
    4055             : static void
    4056           0 : _nvmf_rdma_register_poller_in_group(void *c)
    4057             : {
    4058           0 :         struct spdk_nvmf_rdma_poller    *poller;
    4059           0 :         struct poller_manage_ctx        *ctx = c;
    4060             :         struct spdk_nvmf_rdma_device    *device;
    4061             :         int                             rc;
    4062             : 
    4063           0 :         rc = nvmf_rdma_poller_create(ctx->rtransport, ctx->rgroup, ctx->device, &poller);
    4064           0 :         if (rc < 0 && poller) {
    4065           0 :                 nvmf_rdma_poller_destroy(poller);
    4066             :         }
    4067             : 
    4068           0 :         device = ctx->device;
    4069           0 :         if (nvmf_rdma_all_pollers_management_done(ctx)) {
    4070           0 :                 device->is_ready = true;
    4071             :         }
    4072           0 : }
    4073             : 
    4074             : static void nvmf_rdma_poll_group_destroy(struct spdk_nvmf_transport_poll_group *group);
    4075             : 
    4076             : static struct spdk_nvmf_transport_poll_group *
    4077           5 : nvmf_rdma_poll_group_create(struct spdk_nvmf_transport *transport,
    4078             :                             struct spdk_nvmf_poll_group *group)
    4079             : {
    4080             :         struct spdk_nvmf_rdma_transport         *rtransport;
    4081             :         struct spdk_nvmf_rdma_poll_group        *rgroup;
    4082           5 :         struct spdk_nvmf_rdma_poller            *poller;
    4083             :         struct spdk_nvmf_rdma_device            *device;
    4084             :         int                                     rc;
    4085             : 
    4086           5 :         if (spdk_interrupt_mode_is_enabled()) {
    4087           0 :                 SPDK_ERRLOG("RDMA transport does not support interrupt mode\n");
    4088           0 :                 return NULL;
    4089             :         }
    4090             : 
    4091           5 :         rtransport = SPDK_CONTAINEROF(transport, struct spdk_nvmf_rdma_transport, transport);
    4092             : 
    4093           5 :         rgroup = calloc(1, sizeof(*rgroup));
    4094           5 :         if (!rgroup) {
    4095           0 :                 return NULL;
    4096             :         }
    4097             : 
    4098           5 :         TAILQ_INIT(&rgroup->pollers);
    4099             : 
    4100           5 :         TAILQ_FOREACH(device, &rtransport->devices, link) {
    4101           0 :                 rc = nvmf_rdma_poller_create(rtransport, rgroup, device, &poller);
    4102           0 :                 if (rc < 0) {
    4103           0 :                         nvmf_rdma_poll_group_destroy(&rgroup->group);
    4104           0 :                         return NULL;
    4105             :                 }
    4106             :         }
    4107             : 
    4108           5 :         TAILQ_INSERT_TAIL(&rtransport->poll_groups, rgroup, link);
    4109           5 :         if (rtransport->conn_sched.next_admin_pg == NULL) {
    4110           1 :                 rtransport->conn_sched.next_admin_pg = rgroup;
    4111           1 :                 rtransport->conn_sched.next_io_pg = rgroup;
    4112             :         }
    4113             : 
    4114           5 :         return &rgroup->group;
    4115             : }
    4116             : 
    4117             : static uint32_t
    4118          12 : nvmf_poll_group_get_io_qpair_count(struct spdk_nvmf_poll_group *pg)
    4119             : {
    4120             :         uint32_t count;
    4121             : 
    4122             :         /* Just assume that unassociated qpairs will eventually be io
    4123             :          * qpairs.  This is close enough for the use cases for this
    4124             :          * function.
    4125             :          */
    4126          12 :         pthread_mutex_lock(&pg->mutex);
    4127          12 :         count = pg->stat.current_io_qpairs + pg->current_unassociated_qpairs;
    4128          12 :         pthread_mutex_unlock(&pg->mutex);
    4129             : 
    4130          12 :         return count;
    4131             : }
    4132             : 
    4133             : static struct spdk_nvmf_transport_poll_group *
    4134          14 : nvmf_rdma_get_optimal_poll_group(struct spdk_nvmf_qpair *qpair)
    4135             : {
    4136             :         struct spdk_nvmf_rdma_transport *rtransport;
    4137             :         struct spdk_nvmf_rdma_poll_group **pg;
    4138             :         struct spdk_nvmf_transport_poll_group *result;
    4139             :         uint32_t count;
    4140             : 
    4141          14 :         rtransport = SPDK_CONTAINEROF(qpair->transport, struct spdk_nvmf_rdma_transport, transport);
    4142             : 
    4143          14 :         if (TAILQ_EMPTY(&rtransport->poll_groups)) {
    4144           2 :                 return NULL;
    4145             :         }
    4146             : 
    4147          12 :         if (qpair->qid == 0) {
    4148           6 :                 pg = &rtransport->conn_sched.next_admin_pg;
    4149             :         } else {
    4150             :                 struct spdk_nvmf_rdma_poll_group *pg_min, *pg_start, *pg_current;
    4151             :                 uint32_t min_value;
    4152             : 
    4153           6 :                 pg = &rtransport->conn_sched.next_io_pg;
    4154           6 :                 pg_min = *pg;
    4155           6 :                 pg_start = *pg;
    4156           6 :                 pg_current = *pg;
    4157           6 :                 min_value = nvmf_poll_group_get_io_qpair_count(pg_current->group.group);
    4158             : 
    4159             :                 while (1) {
    4160           6 :                         count = nvmf_poll_group_get_io_qpair_count(pg_current->group.group);
    4161             : 
    4162           6 :                         if (count < min_value) {
    4163           0 :                                 min_value = count;
    4164           0 :                                 pg_min = pg_current;
    4165             :                         }
    4166             : 
    4167           6 :                         pg_current = TAILQ_NEXT(pg_current, link);
    4168           6 :                         if (pg_current == NULL) {
    4169           2 :                                 pg_current = TAILQ_FIRST(&rtransport->poll_groups);
    4170             :                         }
    4171             : 
    4172           6 :                         if (pg_current == pg_start || min_value == 0) {
    4173             :                                 break;
    4174             :                         }
    4175             :                 }
    4176           6 :                 *pg = pg_min;
    4177             :         }
    4178             : 
    4179          12 :         assert(*pg != NULL);
    4180             : 
    4181          12 :         result = &(*pg)->group;
    4182             : 
    4183          12 :         *pg = TAILQ_NEXT(*pg, link);
    4184          12 :         if (*pg == NULL) {
    4185           4 :                 *pg = TAILQ_FIRST(&rtransport->poll_groups);
    4186             :         }
    4187             : 
    4188          12 :         return result;
    4189             : }
    4190             : 
    4191             : static void
    4192           0 : nvmf_rdma_poller_destroy(struct spdk_nvmf_rdma_poller *poller)
    4193             : {
    4194             :         struct spdk_nvmf_rdma_qpair     *qpair, *tmp_qpair;
    4195             :         int                             rc;
    4196             : 
    4197           0 :         TAILQ_REMOVE(&poller->group->pollers, poller, link);
    4198           0 :         RB_FOREACH_SAFE(qpair, qpairs_tree, &poller->qpairs, tmp_qpair) {
    4199           0 :                 nvmf_rdma_qpair_destroy(qpair);
    4200             :         }
    4201             : 
    4202           0 :         if (poller->srq) {
    4203           0 :                 if (poller->resources) {
    4204           0 :                         nvmf_rdma_resources_destroy(poller->resources);
    4205             :                 }
    4206           0 :                 spdk_rdma_provider_srq_destroy(poller->srq);
    4207           0 :                 SPDK_DEBUGLOG(rdma, "Destroyed RDMA shared queue %p\n", poller->srq);
    4208             :         }
    4209             : 
    4210           0 :         if (poller->cq) {
    4211           0 :                 rc = ibv_destroy_cq(poller->cq);
    4212           0 :                 if (rc != 0) {
    4213           0 :                         SPDK_ERRLOG("Destroy cq return %d, error: %s\n", rc, strerror(errno));
    4214             :                 }
    4215             :         }
    4216             : 
    4217           0 :         if (poller->destroy_cb) {
    4218           0 :                 poller->destroy_cb(poller->destroy_cb_ctx);
    4219           0 :                 poller->destroy_cb = NULL;
    4220             :         }
    4221             : 
    4222           0 :         free(poller);
    4223           0 : }
    4224             : 
    4225             : static void
    4226           5 : nvmf_rdma_poll_group_destroy(struct spdk_nvmf_transport_poll_group *group)
    4227             : {
    4228             :         struct spdk_nvmf_rdma_poll_group        *rgroup, *next_rgroup;
    4229             :         struct spdk_nvmf_rdma_poller            *poller, *tmp;
    4230             :         struct spdk_nvmf_rdma_transport         *rtransport;
    4231             : 
    4232           5 :         rgroup = SPDK_CONTAINEROF(group, struct spdk_nvmf_rdma_poll_group, group);
    4233           5 :         if (!rgroup) {
    4234           0 :                 return;
    4235             :         }
    4236             : 
    4237           5 :         TAILQ_FOREACH_SAFE(poller, &rgroup->pollers, link, tmp) {
    4238           0 :                 nvmf_rdma_poller_destroy(poller);
    4239             :         }
    4240             : 
    4241           5 :         if (rgroup->group.transport == NULL) {
    4242             :                 /* Transport can be NULL when nvmf_rdma_poll_group_create()
    4243             :                  * calls this function directly in a failure path. */
    4244           0 :                 free(rgroup);
    4245           0 :                 return;
    4246             :         }
    4247             : 
    4248           5 :         rtransport = SPDK_CONTAINEROF(rgroup->group.transport, struct spdk_nvmf_rdma_transport, transport);
    4249             : 
    4250           5 :         next_rgroup = TAILQ_NEXT(rgroup, link);
    4251           5 :         TAILQ_REMOVE(&rtransport->poll_groups, rgroup, link);
    4252           5 :         if (next_rgroup == NULL) {
    4253           1 :                 next_rgroup = TAILQ_FIRST(&rtransport->poll_groups);
    4254             :         }
    4255           5 :         if (rtransport->conn_sched.next_admin_pg == rgroup) {
    4256           5 :                 rtransport->conn_sched.next_admin_pg = next_rgroup;
    4257             :         }
    4258           5 :         if (rtransport->conn_sched.next_io_pg == rgroup) {
    4259           5 :                 rtransport->conn_sched.next_io_pg = next_rgroup;
    4260             :         }
    4261             : 
    4262           5 :         free(rgroup);
    4263             : }
    4264             : 
    4265             : static void
    4266           0 : nvmf_rdma_qpair_reject_connection(struct spdk_nvmf_rdma_qpair *rqpair)
    4267             : {
    4268           0 :         if (rqpair->cm_id != NULL) {
    4269           0 :                 nvmf_rdma_event_reject(rqpair->cm_id, SPDK_NVMF_RDMA_ERROR_NO_RESOURCES);
    4270             :         }
    4271           0 : }
    4272             : 
    4273             : static int
    4274           0 : nvmf_rdma_poll_group_add(struct spdk_nvmf_transport_poll_group *group,
    4275             :                          struct spdk_nvmf_qpair *qpair)
    4276             : {
    4277             :         struct spdk_nvmf_rdma_poll_group        *rgroup;
    4278             :         struct spdk_nvmf_rdma_qpair             *rqpair;
    4279             :         struct spdk_nvmf_rdma_device            *device;
    4280             :         struct spdk_nvmf_rdma_poller            *poller;
    4281             :         int                                     rc;
    4282             : 
    4283           0 :         rgroup = SPDK_CONTAINEROF(group, struct spdk_nvmf_rdma_poll_group, group);
    4284           0 :         rqpair = SPDK_CONTAINEROF(qpair, struct spdk_nvmf_rdma_qpair, qpair);
    4285             : 
    4286           0 :         device = rqpair->device;
    4287             : 
    4288           0 :         TAILQ_FOREACH(poller, &rgroup->pollers, link) {
    4289           0 :                 if (poller->device == device) {
    4290           0 :                         break;
    4291             :                 }
    4292             :         }
    4293             : 
    4294           0 :         if (!poller) {
    4295           0 :                 SPDK_ERRLOG("No poller found for device.\n");
    4296           0 :                 return -1;
    4297             :         }
    4298             : 
    4299           0 :         if (poller->need_destroy) {
    4300           0 :                 SPDK_ERRLOG("Poller is destroying.\n");
    4301           0 :                 return -1;
    4302             :         }
    4303             : 
    4304           0 :         rqpair->poller = poller;
    4305           0 :         rqpair->srq = rqpair->poller->srq;
    4306             : 
    4307           0 :         rc = nvmf_rdma_qpair_initialize(qpair);
    4308           0 :         if (rc < 0) {
    4309           0 :                 SPDK_ERRLOG("Failed to initialize nvmf_rdma_qpair with qpair=%p\n", qpair);
    4310           0 :                 rqpair->poller = NULL;
    4311           0 :                 rqpair->srq = NULL;
    4312           0 :                 return -1;
    4313             :         }
    4314             : 
    4315           0 :         RB_INSERT(qpairs_tree, &poller->qpairs, rqpair);
    4316             : 
    4317           0 :         rc = nvmf_rdma_event_accept(rqpair->cm_id, rqpair);
    4318           0 :         if (rc) {
    4319             :                 /* Try to reject, but we probably can't */
    4320           0 :                 nvmf_rdma_qpair_reject_connection(rqpair);
    4321           0 :                 return -1;
    4322             :         }
    4323             : 
    4324           0 :         return 0;
    4325             : }
    4326             : 
    4327             : static int
    4328           0 : nvmf_rdma_poll_group_remove(struct spdk_nvmf_transport_poll_group *group,
    4329             :                             struct spdk_nvmf_qpair *qpair)
    4330             : {
    4331             :         struct spdk_nvmf_rdma_qpair             *rqpair;
    4332             : 
    4333           0 :         rqpair = SPDK_CONTAINEROF(qpair, struct spdk_nvmf_rdma_qpair, qpair);
    4334           0 :         assert(group->transport->tgt != NULL);
    4335             : 
    4336           0 :         rqpair->destruct_channel = spdk_get_io_channel(group->transport->tgt);
    4337             : 
    4338           0 :         if (!rqpair->destruct_channel) {
    4339           0 :                 SPDK_WARNLOG("failed to get io_channel, qpair %p\n", qpair);
    4340           0 :                 return 0;
    4341             :         }
    4342             : 
    4343             :         /* Sanity check that we get io_channel on the correct thread */
    4344           0 :         if (qpair->group) {
    4345           0 :                 assert(qpair->group->thread == spdk_io_channel_get_thread(rqpair->destruct_channel));
    4346             :         }
    4347             : 
    4348           0 :         return 0;
    4349             : }
    4350             : 
    4351             : static int
    4352           0 : nvmf_rdma_request_free(struct spdk_nvmf_request *req)
    4353             : {
    4354           0 :         struct spdk_nvmf_rdma_request   *rdma_req = SPDK_CONTAINEROF(req, struct spdk_nvmf_rdma_request, req);
    4355           0 :         struct spdk_nvmf_rdma_transport *rtransport = SPDK_CONTAINEROF(req->qpair->transport,
    4356             :                         struct spdk_nvmf_rdma_transport, transport);
    4357           0 :         struct spdk_nvmf_rdma_qpair *rqpair = SPDK_CONTAINEROF(rdma_req->req.qpair,
    4358             :                                               struct spdk_nvmf_rdma_qpair, qpair);
    4359             : 
    4360             :         /*
    4361             :          * AER requests are freed when a qpair is destroyed. The recv corresponding to that request
    4362             :          * needs to be returned to the shared receive queue or the poll group will eventually be
    4363             :          * starved of RECV structures.
    4364             :          */
    4365           0 :         if (rqpair->srq && rdma_req->recv) {
    4366             :                 int rc;
    4367           0 :                 struct ibv_recv_wr *bad_recv_wr;
    4368             : 
    4369           0 :                 spdk_rdma_provider_srq_queue_recv_wrs(rqpair->srq, &rdma_req->recv->wr);
    4370           0 :                 rc = spdk_rdma_provider_srq_flush_recv_wrs(rqpair->srq, &bad_recv_wr);
    4371           0 :                 if (rc) {
    4372           0 :                         SPDK_ERRLOG("Unable to re-post rx descriptor\n");
    4373             :                 }
    4374             :         }
    4375             : 
    4376           0 :         _nvmf_rdma_request_free(rdma_req, rtransport);
    4377           0 :         return 0;
    4378             : }
    4379             : 
    4380             : static int
    4381           0 : nvmf_rdma_request_complete(struct spdk_nvmf_request *req)
    4382             : {
    4383           0 :         struct spdk_nvmf_rdma_transport *rtransport = SPDK_CONTAINEROF(req->qpair->transport,
    4384             :                         struct spdk_nvmf_rdma_transport, transport);
    4385           0 :         struct spdk_nvmf_rdma_request   *rdma_req = SPDK_CONTAINEROF(req,
    4386             :                         struct spdk_nvmf_rdma_request, req);
    4387           0 :         struct spdk_nvmf_rdma_qpair     *rqpair = SPDK_CONTAINEROF(rdma_req->req.qpair,
    4388             :                         struct spdk_nvmf_rdma_qpair, qpair);
    4389             : 
    4390           0 :         if (spdk_unlikely(rqpair->ibv_in_error_state)) {
    4391             :                 /* The connection is dead. Move the request directly to the completed state. */
    4392           0 :                 rdma_req->state = RDMA_REQUEST_STATE_COMPLETED;
    4393             :         } else {
    4394             :                 /* The connection is alive, so process the request as normal */
    4395           0 :                 rdma_req->state = RDMA_REQUEST_STATE_EXECUTED;
    4396             :         }
    4397             : 
    4398           0 :         nvmf_rdma_request_process(rtransport, rdma_req);
    4399             : 
    4400           0 :         return 0;
    4401             : }
    4402             : 
    4403             : static void
    4404           0 : nvmf_rdma_close_qpair(struct spdk_nvmf_qpair *qpair,
    4405             :                       spdk_nvmf_transport_qpair_fini_cb cb_fn, void *cb_arg)
    4406             : {
    4407           0 :         struct spdk_nvmf_rdma_qpair *rqpair = SPDK_CONTAINEROF(qpair, struct spdk_nvmf_rdma_qpair, qpair);
    4408             : 
    4409           0 :         rqpair->to_close = true;
    4410             : 
    4411             :         /* This happens only when the qpair is disconnected before
    4412             :          * it is added to the poll group. Since there is no poll group,
    4413             :          * the RDMA qp has not been initialized yet and the RDMA CM
    4414             :          * event has not yet been acknowledged, so we need to reject it.
    4415             :          */
    4416           0 :         if (rqpair->qpair.state == SPDK_NVMF_QPAIR_UNINITIALIZED) {
    4417           0 :                 nvmf_rdma_qpair_reject_connection(rqpair);
    4418           0 :                 nvmf_rdma_qpair_destroy(rqpair);
    4419           0 :                 return;
    4420             :         }
    4421             : 
    4422           0 :         if (rqpair->rdma_qp) {
    4423           0 :                 spdk_rdma_provider_qp_disconnect(rqpair->rdma_qp);
    4424             :         }
    4425             : 
    4426           0 :         nvmf_rdma_destroy_drained_qpair(rqpair);
    4427             : 
    4428           0 :         if (cb_fn) {
    4429           0 :                 cb_fn(cb_arg);
    4430             :         }
    4431             : }
    4432             : 
    4433             : static struct spdk_nvmf_rdma_qpair *
    4434           0 : get_rdma_qpair_from_wc(struct spdk_nvmf_rdma_poller *rpoller, struct ibv_wc *wc)
    4435             : {
    4436           0 :         struct spdk_nvmf_rdma_qpair find;
    4437             : 
    4438           0 :         find.qp_num = wc->qp_num;
    4439             : 
    4440           0 :         return RB_FIND(qpairs_tree, &rpoller->qpairs, &find);
    4441             : }
    4442             : 
    4443             : #ifdef DEBUG
    4444             : static int
    4445           0 : nvmf_rdma_req_is_completing(struct spdk_nvmf_rdma_request *rdma_req)
    4446             : {
    4447           0 :         return rdma_req->state == RDMA_REQUEST_STATE_TRANSFERRING_CONTROLLER_TO_HOST ||
    4448           0 :                rdma_req->state == RDMA_REQUEST_STATE_COMPLETING;
    4449             : }
    4450             : #endif
    4451             : 
    4452             : static void
    4453           0 : _poller_reset_failed_recvs(struct spdk_nvmf_rdma_poller *rpoller, struct ibv_recv_wr *bad_recv_wr,
    4454             :                            int rc)
    4455             : {
    4456             :         struct spdk_nvmf_rdma_recv      *rdma_recv;
    4457             :         struct spdk_nvmf_rdma_wr        *bad_rdma_wr;
    4458             : 
    4459           0 :         SPDK_ERRLOG("Failed to post a recv for the poller %p with errno %d\n", rpoller, -rc);
    4460           0 :         while (bad_recv_wr != NULL) {
    4461           0 :                 bad_rdma_wr = (struct spdk_nvmf_rdma_wr *)bad_recv_wr->wr_id;
    4462           0 :                 rdma_recv = SPDK_CONTAINEROF(bad_rdma_wr, struct spdk_nvmf_rdma_recv, rdma_wr);
    4463             : 
    4464           0 :                 rdma_recv->qpair->current_recv_depth++;
    4465           0 :                 bad_recv_wr = bad_recv_wr->next;
    4466           0 :                 SPDK_ERRLOG("Failed to post a recv for the qpair %p with errno %d\n", rdma_recv->qpair, -rc);
    4467           0 :                 spdk_nvmf_qpair_disconnect(&rdma_recv->qpair->qpair);
    4468             :         }
    4469           0 : }
    4470             : 
    4471             : static void
    4472           0 : _qp_reset_failed_recvs(struct spdk_nvmf_rdma_qpair *rqpair, struct ibv_recv_wr *bad_recv_wr, int rc)
    4473             : {
    4474           0 :         SPDK_ERRLOG("Failed to post a recv for the qpair %p with errno %d\n", rqpair, -rc);
    4475           0 :         while (bad_recv_wr != NULL) {
    4476           0 :                 bad_recv_wr = bad_recv_wr->next;
    4477           0 :                 rqpair->current_recv_depth++;
    4478             :         }
    4479           0 :         spdk_nvmf_qpair_disconnect(&rqpair->qpair);
    4480           0 : }
    4481             : 
    4482             : static void
    4483           0 : _poller_submit_recvs(struct spdk_nvmf_rdma_transport *rtransport,
    4484             :                      struct spdk_nvmf_rdma_poller *rpoller)
    4485             : {
    4486             :         struct spdk_nvmf_rdma_qpair     *rqpair;
    4487           0 :         struct ibv_recv_wr              *bad_recv_wr;
    4488             :         int                             rc;
    4489             : 
    4490           0 :         if (rpoller->srq) {
    4491           0 :                 rc = spdk_rdma_provider_srq_flush_recv_wrs(rpoller->srq, &bad_recv_wr);
    4492           0 :                 if (spdk_unlikely(rc)) {
    4493           0 :                         _poller_reset_failed_recvs(rpoller, bad_recv_wr, rc);
    4494             :                 }
    4495             :         } else {
    4496           0 :                 while (!STAILQ_EMPTY(&rpoller->qpairs_pending_recv)) {
    4497           0 :                         rqpair = STAILQ_FIRST(&rpoller->qpairs_pending_recv);
    4498           0 :                         rc = spdk_rdma_provider_qp_flush_recv_wrs(rqpair->rdma_qp, &bad_recv_wr);
    4499           0 :                         if (spdk_unlikely(rc)) {
    4500           0 :                                 _qp_reset_failed_recvs(rqpair, bad_recv_wr, rc);
    4501             :                         }
    4502           0 :                         STAILQ_REMOVE_HEAD(&rpoller->qpairs_pending_recv, recv_link);
    4503             :                 }
    4504             :         }
    4505           0 : }
    4506             : 
    4507             : static void
    4508           0 : _qp_reset_failed_sends(struct spdk_nvmf_rdma_transport *rtransport,
    4509             :                        struct spdk_nvmf_rdma_qpair *rqpair, struct ibv_send_wr *bad_wr, int rc)
    4510             : {
    4511             :         struct spdk_nvmf_rdma_wr        *bad_rdma_wr;
    4512           0 :         struct spdk_nvmf_rdma_request   *prev_rdma_req = NULL, *cur_rdma_req = NULL;
    4513             : 
    4514           0 :         SPDK_ERRLOG("Failed to post a send for the qpair %p with errno %d\n", rqpair, -rc);
    4515           0 :         for (; bad_wr != NULL; bad_wr = bad_wr->next) {
    4516           0 :                 bad_rdma_wr = (struct spdk_nvmf_rdma_wr *)bad_wr->wr_id;
    4517           0 :                 assert(rqpair->current_send_depth > 0);
    4518           0 :                 rqpair->current_send_depth--;
    4519           0 :                 switch (bad_rdma_wr->type) {
    4520           0 :                 case RDMA_WR_TYPE_DATA:
    4521           0 :                         cur_rdma_req = SPDK_CONTAINEROF(bad_rdma_wr, struct spdk_nvmf_rdma_request, data_wr);
    4522           0 :                         if (bad_wr->opcode == IBV_WR_RDMA_READ) {
    4523           0 :                                 assert(rqpair->current_read_depth > 0);
    4524           0 :                                 rqpair->current_read_depth--;
    4525             :                         }
    4526           0 :                         break;
    4527           0 :                 case RDMA_WR_TYPE_SEND:
    4528           0 :                         cur_rdma_req = SPDK_CONTAINEROF(bad_rdma_wr, struct spdk_nvmf_rdma_request, rsp_wr);
    4529           0 :                         break;
    4530           0 :                 default:
    4531           0 :                         SPDK_ERRLOG("Found a RECV in the list of pending SEND requests for qpair %p\n", rqpair);
    4532           0 :                         prev_rdma_req = cur_rdma_req;
    4533           0 :                         continue;
    4534             :                 }
    4535             : 
    4536           0 :                 if (prev_rdma_req == cur_rdma_req) {
    4537             :                         /* this request was handled by an earlier wr. i.e. we were performing an nvme read. */
    4538             :                         /* We only have to check against prev_wr since each requests wrs are contiguous in this list. */
    4539           0 :                         continue;
    4540             :                 }
    4541             : 
    4542           0 :                 switch (cur_rdma_req->state) {
    4543           0 :                 case RDMA_REQUEST_STATE_TRANSFERRING_HOST_TO_CONTROLLER:
    4544           0 :                         cur_rdma_req->req.rsp->nvme_cpl.status.sc = SPDK_NVME_SC_INTERNAL_DEVICE_ERROR;
    4545           0 :                         STAILQ_INSERT_TAIL(&rqpair->pending_rdma_send_queue, cur_rdma_req, state_link);
    4546           0 :                         cur_rdma_req->state = RDMA_REQUEST_STATE_READY_TO_COMPLETE_PENDING;
    4547           0 :                         break;
    4548           0 :                 case RDMA_REQUEST_STATE_TRANSFERRING_CONTROLLER_TO_HOST:
    4549             :                 case RDMA_REQUEST_STATE_COMPLETING:
    4550           0 :                         cur_rdma_req->state = RDMA_REQUEST_STATE_COMPLETED;
    4551           0 :                         break;
    4552           0 :                 default:
    4553           0 :                         SPDK_ERRLOG("Found a request in a bad state %d when draining pending SEND requests for qpair %p\n",
    4554             :                                     cur_rdma_req->state, rqpair);
    4555           0 :                         continue;
    4556             :                 }
    4557             : 
    4558           0 :                 nvmf_rdma_request_process(rtransport, cur_rdma_req);
    4559           0 :                 prev_rdma_req = cur_rdma_req;
    4560             :         }
    4561             : 
    4562           0 :         if (spdk_nvmf_qpair_is_active(&rqpair->qpair)) {
    4563             :                 /* Disconnect the connection. */
    4564           0 :                 spdk_nvmf_qpair_disconnect(&rqpair->qpair);
    4565             :         }
    4566             : 
    4567           0 : }
    4568             : 
    4569             : static void
    4570           0 : _poller_submit_sends(struct spdk_nvmf_rdma_transport *rtransport,
    4571             :                      struct spdk_nvmf_rdma_poller *rpoller)
    4572             : {
    4573             :         struct spdk_nvmf_rdma_qpair     *rqpair;
    4574           0 :         struct ibv_send_wr              *bad_wr = NULL;
    4575             :         int                             rc;
    4576             : 
    4577           0 :         while (!STAILQ_EMPTY(&rpoller->qpairs_pending_send)) {
    4578           0 :                 rqpair = STAILQ_FIRST(&rpoller->qpairs_pending_send);
    4579           0 :                 rc = spdk_rdma_provider_qp_flush_send_wrs(rqpair->rdma_qp, &bad_wr);
    4580             : 
    4581             :                 /* bad wr always points to the first wr that failed. */
    4582           0 :                 if (spdk_unlikely(rc)) {
    4583           0 :                         _qp_reset_failed_sends(rtransport, rqpair, bad_wr, rc);
    4584             :                 }
    4585           0 :                 STAILQ_REMOVE_HEAD(&rpoller->qpairs_pending_send, send_link);
    4586             :         }
    4587           0 : }
    4588             : 
    4589             : static const char *
    4590           0 : nvmf_rdma_wr_type_str(enum spdk_nvmf_rdma_wr_type wr_type)
    4591             : {
    4592           0 :         switch (wr_type) {
    4593           0 :         case RDMA_WR_TYPE_RECV:
    4594           0 :                 return "RECV";
    4595           0 :         case RDMA_WR_TYPE_SEND:
    4596           0 :                 return "SEND";
    4597           0 :         case RDMA_WR_TYPE_DATA:
    4598           0 :                 return "DATA";
    4599           0 :         default:
    4600           0 :                 SPDK_ERRLOG("Unknown WR type %d\n", wr_type);
    4601           0 :                 SPDK_UNREACHABLE();
    4602             :         }
    4603             : }
    4604             : 
    4605             : static inline void
    4606           0 : nvmf_rdma_log_wc_status(struct spdk_nvmf_rdma_qpair *rqpair, struct ibv_wc *wc)
    4607             : {
    4608           0 :         enum spdk_nvmf_rdma_wr_type wr_type = ((struct spdk_nvmf_rdma_wr *)wc->wr_id)->type;
    4609             : 
    4610           0 :         if (wc->status == IBV_WC_WR_FLUSH_ERR) {
    4611             :                 /* If qpair is in ERR state, we will receive completions for all posted and not completed
    4612             :                  * Work Requests with IBV_WC_WR_FLUSH_ERR status. Don't log an error in that case */
    4613           0 :                 SPDK_DEBUGLOG(rdma,
    4614             :                               "Error on CQ %p, (qp state %d, in_error %d) request 0x%lu, type %s, status: (%d): %s\n",
    4615             :                               rqpair->poller->cq, rqpair->qpair.state, rqpair->ibv_in_error_state, wc->wr_id,
    4616             :                               nvmf_rdma_wr_type_str(wr_type), wc->status, ibv_wc_status_str(wc->status));
    4617             :         } else {
    4618           0 :                 SPDK_ERRLOG("Error on CQ %p, (qp state %d, in_error %d) request 0x%lu, type %s, status: (%d): %s\n",
    4619             :                             rqpair->poller->cq, rqpair->qpair.state, rqpair->ibv_in_error_state, wc->wr_id,
    4620             :                             nvmf_rdma_wr_type_str(wr_type), wc->status, ibv_wc_status_str(wc->status));
    4621             :         }
    4622           0 : }
    4623             : 
    4624             : static int
    4625           0 : nvmf_rdma_poller_poll(struct spdk_nvmf_rdma_transport *rtransport,
    4626             :                       struct spdk_nvmf_rdma_poller *rpoller)
    4627             : {
    4628           0 :         struct ibv_wc wc[32];
    4629             :         struct spdk_nvmf_rdma_wr        *rdma_wr;
    4630             :         struct spdk_nvmf_rdma_request   *rdma_req;
    4631             :         struct spdk_nvmf_rdma_recv      *rdma_recv;
    4632             :         struct spdk_nvmf_rdma_qpair     *rqpair, *tmp_rqpair;
    4633             :         int reaped, i;
    4634           0 :         int count = 0;
    4635             :         int rc;
    4636           0 :         bool error = false;
    4637           0 :         uint64_t poll_tsc = spdk_get_ticks();
    4638             : 
    4639           0 :         if (spdk_unlikely(rpoller->need_destroy)) {
    4640             :                 /* If qpair is closed before poller destroy, nvmf_rdma_destroy_drained_qpair may not
    4641             :                  * be called because we cannot poll anything from cq. So we call that here to force
    4642             :                  * destroy the qpair after to_close turning true.
    4643             :                  */
    4644           0 :                 RB_FOREACH_SAFE(rqpair, qpairs_tree, &rpoller->qpairs, tmp_rqpair) {
    4645           0 :                         nvmf_rdma_destroy_drained_qpair(rqpair);
    4646             :                 }
    4647           0 :                 return 0;
    4648             :         }
    4649             : 
    4650             :         /* Poll for completing operations. */
    4651           0 :         reaped = ibv_poll_cq(rpoller->cq, 32, wc);
    4652           0 :         if (spdk_unlikely(reaped < 0)) {
    4653           0 :                 SPDK_ERRLOG("Error polling CQ! (%d): %s\n",
    4654             :                             errno, spdk_strerror(errno));
    4655           0 :                 return -1;
    4656           0 :         } else if (reaped == 0) {
    4657           0 :                 rpoller->stat.idle_polls++;
    4658             :         }
    4659             : 
    4660           0 :         rpoller->stat.polls++;
    4661           0 :         rpoller->stat.completions += reaped;
    4662             : 
    4663           0 :         for (i = 0; i < reaped; i++) {
    4664             : 
    4665           0 :                 rdma_wr = (struct spdk_nvmf_rdma_wr *)wc[i].wr_id;
    4666             : 
    4667           0 :                 switch (rdma_wr->type) {
    4668           0 :                 case RDMA_WR_TYPE_SEND:
    4669           0 :                         rdma_req = SPDK_CONTAINEROF(rdma_wr, struct spdk_nvmf_rdma_request, rsp_wr);
    4670           0 :                         rqpair = SPDK_CONTAINEROF(rdma_req->req.qpair, struct spdk_nvmf_rdma_qpair, qpair);
    4671             : 
    4672           0 :                         if (spdk_likely(!wc[i].status)) {
    4673           0 :                                 count++;
    4674           0 :                                 assert(wc[i].opcode == IBV_WC_SEND);
    4675           0 :                                 assert(nvmf_rdma_req_is_completing(rdma_req));
    4676             :                         }
    4677             : 
    4678           0 :                         rdma_req->state = RDMA_REQUEST_STATE_COMPLETED;
    4679             :                         /* RDMA_WRITE operation completed. +1 since it was chained with rsp WR */
    4680           0 :                         assert(rqpair->current_send_depth >= (uint32_t)rdma_req->num_outstanding_data_wr + 1);
    4681           0 :                         rqpair->current_send_depth -= rdma_req->num_outstanding_data_wr + 1;
    4682           0 :                         rdma_req->num_outstanding_data_wr = 0;
    4683             : 
    4684           0 :                         nvmf_rdma_request_process(rtransport, rdma_req);
    4685           0 :                         break;
    4686           0 :                 case RDMA_WR_TYPE_RECV:
    4687             :                         /* rdma_recv->qpair will be invalid if using an SRQ.  In that case we have to get the qpair from the wc. */
    4688           0 :                         rdma_recv = SPDK_CONTAINEROF(rdma_wr, struct spdk_nvmf_rdma_recv, rdma_wr);
    4689           0 :                         if (rpoller->srq != NULL) {
    4690           0 :                                 rdma_recv->qpair = get_rdma_qpair_from_wc(rpoller, &wc[i]);
    4691             :                                 /* It is possible that there are still some completions for destroyed QP
    4692             :                                  * associated with SRQ. We just ignore these late completions and re-post
    4693             :                                  * receive WRs back to SRQ.
    4694             :                                  */
    4695           0 :                                 if (spdk_unlikely(NULL == rdma_recv->qpair)) {
    4696           0 :                                         struct ibv_recv_wr *bad_wr;
    4697             : 
    4698           0 :                                         rdma_recv->wr.next = NULL;
    4699           0 :                                         spdk_rdma_provider_srq_queue_recv_wrs(rpoller->srq, &rdma_recv->wr);
    4700           0 :                                         rc = spdk_rdma_provider_srq_flush_recv_wrs(rpoller->srq, &bad_wr);
    4701           0 :                                         if (rc) {
    4702           0 :                                                 SPDK_ERRLOG("Failed to re-post recv WR to SRQ, err %d\n", rc);
    4703             :                                         }
    4704           0 :                                         continue;
    4705             :                                 }
    4706             :                         }
    4707           0 :                         rqpair = rdma_recv->qpair;
    4708             : 
    4709           0 :                         assert(rqpair != NULL);
    4710           0 :                         if (spdk_likely(!wc[i].status)) {
    4711           0 :                                 assert(wc[i].opcode == IBV_WC_RECV);
    4712           0 :                                 if (rqpair->current_recv_depth >= rqpair->max_queue_depth) {
    4713           0 :                                         spdk_nvmf_qpair_disconnect(&rqpair->qpair);
    4714           0 :                                         break;
    4715             :                                 }
    4716             :                         }
    4717             : 
    4718           0 :                         rdma_recv->wr.next = NULL;
    4719           0 :                         rqpair->current_recv_depth++;
    4720           0 :                         rdma_recv->receive_tsc = poll_tsc;
    4721           0 :                         rpoller->stat.requests++;
    4722           0 :                         STAILQ_INSERT_HEAD(&rqpair->resources->incoming_queue, rdma_recv, link);
    4723           0 :                         rqpair->qpair.queue_depth++;
    4724           0 :                         break;
    4725           0 :                 case RDMA_WR_TYPE_DATA:
    4726           0 :                         rdma_req = SPDK_CONTAINEROF(rdma_wr, struct spdk_nvmf_rdma_request, data_wr);
    4727           0 :                         rqpair = SPDK_CONTAINEROF(rdma_req->req.qpair, struct spdk_nvmf_rdma_qpair, qpair);
    4728             : 
    4729           0 :                         assert(rdma_req->num_outstanding_data_wr > 0);
    4730             : 
    4731           0 :                         rqpair->current_send_depth--;
    4732           0 :                         rdma_req->num_outstanding_data_wr--;
    4733           0 :                         if (spdk_likely(!wc[i].status)) {
    4734           0 :                                 assert(wc[i].opcode == IBV_WC_RDMA_READ);
    4735           0 :                                 rqpair->current_read_depth--;
    4736             :                                 /* wait for all outstanding reads associated with the same rdma_req to complete before proceeding. */
    4737           0 :                                 if (rdma_req->num_outstanding_data_wr == 0) {
    4738           0 :                                         if (rdma_req->num_remaining_data_wr) {
    4739             :                                                 /* Only part of RDMA_READ operations was submitted, process the rest */
    4740           0 :                                                 nvmf_rdma_request_reset_transfer_in(rdma_req, rtransport);
    4741           0 :                                                 rdma_req->state = RDMA_REQUEST_STATE_DATA_TRANSFER_TO_CONTROLLER_PENDING;
    4742           0 :                                                 nvmf_rdma_request_process(rtransport, rdma_req);
    4743           0 :                                                 break;
    4744             :                                         }
    4745           0 :                                         rdma_req->state = RDMA_REQUEST_STATE_READY_TO_EXECUTE;
    4746           0 :                                         nvmf_rdma_request_process(rtransport, rdma_req);
    4747             :                                 }
    4748             :                         } else {
    4749             :                                 /* If the data transfer fails still force the queue into the error state,
    4750             :                                  * if we were performing an RDMA_READ, we need to force the request into a
    4751             :                                  * completed state since it wasn't linked to a send. However, in the RDMA_WRITE
    4752             :                                  * case, we should wait for the SEND to complete. */
    4753           0 :                                 if (rdma_req->data.wr.opcode == IBV_WR_RDMA_READ) {
    4754           0 :                                         rqpair->current_read_depth--;
    4755           0 :                                         if (rdma_req->num_outstanding_data_wr == 0) {
    4756           0 :                                                 rdma_req->state = RDMA_REQUEST_STATE_COMPLETED;
    4757             :                                         }
    4758             :                                 }
    4759             :                         }
    4760           0 :                         break;
    4761           0 :                 default:
    4762           0 :                         SPDK_ERRLOG("Received an unknown opcode on the CQ: %d\n", wc[i].opcode);
    4763           0 :                         continue;
    4764             :                 }
    4765             : 
    4766             :                 /* Handle error conditions */
    4767           0 :                 if (spdk_unlikely(wc[i].status)) {
    4768           0 :                         rqpair->ibv_in_error_state = true;
    4769           0 :                         nvmf_rdma_log_wc_status(rqpair, &wc[i]);
    4770             : 
    4771           0 :                         error = true;
    4772             : 
    4773           0 :                         if (spdk_nvmf_qpair_is_active(&rqpair->qpair)) {
    4774             :                                 /* Disconnect the connection. */
    4775           0 :                                 spdk_nvmf_qpair_disconnect(&rqpair->qpair);
    4776             :                         } else {
    4777           0 :                                 nvmf_rdma_destroy_drained_qpair(rqpair);
    4778             :                         }
    4779           0 :                         continue;
    4780             :                 }
    4781             : 
    4782           0 :                 nvmf_rdma_qpair_process_pending(rtransport, rqpair, false);
    4783             : 
    4784           0 :                 if (spdk_unlikely(!spdk_nvmf_qpair_is_active(&rqpair->qpair))) {
    4785           0 :                         nvmf_rdma_destroy_drained_qpair(rqpair);
    4786             :                 }
    4787             :         }
    4788             : 
    4789           0 :         if (spdk_unlikely(error == true)) {
    4790           0 :                 return -1;
    4791             :         }
    4792             : 
    4793           0 :         if (reaped == 0) {
    4794             :                 /* In some cases we may not receive any CQE but we still may have pending IO requests waiting for
    4795             :                  * a resource (e.g. a WR from the data_wr_pool).
    4796             :                  * We need to start processing of such requests if no CQE reaped */
    4797           0 :                 nvmf_rdma_poller_process_pending_buf_queue(rtransport, rpoller);
    4798             :         }
    4799             : 
    4800             :         /* submit outstanding work requests. */
    4801           0 :         _poller_submit_recvs(rtransport, rpoller);
    4802           0 :         _poller_submit_sends(rtransport, rpoller);
    4803             : 
    4804           0 :         return count;
    4805             : }
    4806             : 
    4807             : static void
    4808           0 : _nvmf_rdma_remove_destroyed_device(void *c)
    4809             : {
    4810           0 :         struct spdk_nvmf_rdma_transport *rtransport = c;
    4811             :         struct spdk_nvmf_rdma_device    *device, *device_tmp;
    4812             :         int                             rc;
    4813             : 
    4814           0 :         TAILQ_FOREACH_SAFE(device, &rtransport->devices, link, device_tmp) {
    4815           0 :                 if (device->ready_to_destroy) {
    4816           0 :                         destroy_ib_device(rtransport, device);
    4817             :                 }
    4818             :         }
    4819             : 
    4820           0 :         free_poll_fds(rtransport);
    4821           0 :         rc = generate_poll_fds(rtransport);
    4822             :         /* cannot handle fd allocation error here */
    4823           0 :         if (rc != 0) {
    4824           0 :                 SPDK_ERRLOG("Failed to generate poll fds after remove ib device.\n");
    4825             :         }
    4826           0 : }
    4827             : 
    4828             : static void
    4829           0 : _nvmf_rdma_remove_poller_in_group_cb(void *c)
    4830             : {
    4831           0 :         struct poller_manage_ctx        *ctx = c;
    4832           0 :         struct spdk_nvmf_rdma_transport *rtransport = ctx->rtransport;
    4833           0 :         struct spdk_nvmf_rdma_device    *device = ctx->device;
    4834           0 :         struct spdk_thread              *thread = ctx->thread;
    4835             : 
    4836           0 :         if (nvmf_rdma_all_pollers_management_done(c)) {
    4837             :                 /* destroy device when last poller is destroyed */
    4838           0 :                 device->ready_to_destroy = true;
    4839           0 :                 spdk_thread_send_msg(thread, _nvmf_rdma_remove_destroyed_device, rtransport);
    4840             :         }
    4841           0 : }
    4842             : 
    4843             : static void
    4844           0 : _nvmf_rdma_remove_poller_in_group(void *c)
    4845             : {
    4846           0 :         struct poller_manage_ctx                *ctx = c;
    4847             : 
    4848           0 :         ctx->rpoller->need_destroy = true;
    4849           0 :         ctx->rpoller->destroy_cb_ctx = ctx;
    4850           0 :         ctx->rpoller->destroy_cb = _nvmf_rdma_remove_poller_in_group_cb;
    4851             : 
    4852             :         /* qp will be disconnected after receiving a RDMA_CM_EVENT_DEVICE_REMOVAL event. */
    4853           0 :         if (RB_EMPTY(&ctx->rpoller->qpairs)) {
    4854           0 :                 nvmf_rdma_poller_destroy(ctx->rpoller);
    4855             :         }
    4856           0 : }
    4857             : 
    4858             : static int
    4859           0 : nvmf_rdma_poll_group_poll(struct spdk_nvmf_transport_poll_group *group)
    4860             : {
    4861             :         struct spdk_nvmf_rdma_transport *rtransport;
    4862             :         struct spdk_nvmf_rdma_poll_group *rgroup;
    4863             :         struct spdk_nvmf_rdma_poller    *rpoller, *tmp;
    4864           0 :         int                             count = 0, rc, rc2 = 0;
    4865             : 
    4866           0 :         rtransport = SPDK_CONTAINEROF(group->transport, struct spdk_nvmf_rdma_transport, transport);
    4867           0 :         rgroup = SPDK_CONTAINEROF(group, struct spdk_nvmf_rdma_poll_group, group);
    4868             : 
    4869           0 :         TAILQ_FOREACH_SAFE(rpoller, &rgroup->pollers, link, tmp) {
    4870           0 :                 rc = nvmf_rdma_poller_poll(rtransport, rpoller);
    4871           0 :                 if (spdk_unlikely(rc < 0)) {
    4872           0 :                         if (rc2 == 0) {
    4873           0 :                                 rc2 = rc;
    4874             :                         }
    4875           0 :                         continue;
    4876             :                 }
    4877           0 :                 count += rc;
    4878             :         }
    4879             : 
    4880           0 :         return rc2 ? rc2 : count;
    4881             : }
    4882             : 
    4883             : static int
    4884           0 : nvmf_rdma_trid_from_cm_id(struct rdma_cm_id *id,
    4885             :                           struct spdk_nvme_transport_id *trid,
    4886             :                           bool peer)
    4887             : {
    4888             :         struct sockaddr *saddr;
    4889             :         uint16_t port;
    4890             : 
    4891           0 :         spdk_nvme_trid_populate_transport(trid, SPDK_NVME_TRANSPORT_RDMA);
    4892             : 
    4893           0 :         if (peer) {
    4894           0 :                 saddr = rdma_get_peer_addr(id);
    4895             :         } else {
    4896           0 :                 saddr = rdma_get_local_addr(id);
    4897             :         }
    4898           0 :         switch (saddr->sa_family) {
    4899           0 :         case AF_INET: {
    4900           0 :                 struct sockaddr_in *saddr_in = (struct sockaddr_in *)saddr;
    4901             : 
    4902           0 :                 trid->adrfam = SPDK_NVMF_ADRFAM_IPV4;
    4903           0 :                 inet_ntop(AF_INET, &saddr_in->sin_addr,
    4904           0 :                           trid->traddr, sizeof(trid->traddr));
    4905           0 :                 if (peer) {
    4906           0 :                         port = ntohs(rdma_get_dst_port(id));
    4907             :                 } else {
    4908           0 :                         port = ntohs(rdma_get_src_port(id));
    4909             :                 }
    4910           0 :                 snprintf(trid->trsvcid, sizeof(trid->trsvcid), "%u", port);
    4911           0 :                 break;
    4912             :         }
    4913           0 :         case AF_INET6: {
    4914           0 :                 struct sockaddr_in6 *saddr_in = (struct sockaddr_in6 *)saddr;
    4915           0 :                 trid->adrfam = SPDK_NVMF_ADRFAM_IPV6;
    4916           0 :                 inet_ntop(AF_INET6, &saddr_in->sin6_addr,
    4917           0 :                           trid->traddr, sizeof(trid->traddr));
    4918           0 :                 if (peer) {
    4919           0 :                         port = ntohs(rdma_get_dst_port(id));
    4920             :                 } else {
    4921           0 :                         port = ntohs(rdma_get_src_port(id));
    4922             :                 }
    4923           0 :                 snprintf(trid->trsvcid, sizeof(trid->trsvcid), "%u", port);
    4924           0 :                 break;
    4925             :         }
    4926           0 :         default:
    4927           0 :                 return -1;
    4928             : 
    4929             :         }
    4930             : 
    4931           0 :         return 0;
    4932             : }
    4933             : 
    4934             : static int
    4935           0 : nvmf_rdma_qpair_get_peer_trid(struct spdk_nvmf_qpair *qpair,
    4936             :                               struct spdk_nvme_transport_id *trid)
    4937             : {
    4938             :         struct spdk_nvmf_rdma_qpair     *rqpair;
    4939             : 
    4940           0 :         rqpair = SPDK_CONTAINEROF(qpair, struct spdk_nvmf_rdma_qpair, qpair);
    4941             : 
    4942           0 :         return nvmf_rdma_trid_from_cm_id(rqpair->cm_id, trid, true);
    4943             : }
    4944             : 
    4945             : static int
    4946           0 : nvmf_rdma_qpair_get_local_trid(struct spdk_nvmf_qpair *qpair,
    4947             :                                struct spdk_nvme_transport_id *trid)
    4948             : {
    4949             :         struct spdk_nvmf_rdma_qpair     *rqpair;
    4950             : 
    4951           0 :         rqpair = SPDK_CONTAINEROF(qpair, struct spdk_nvmf_rdma_qpair, qpair);
    4952             : 
    4953           0 :         return nvmf_rdma_trid_from_cm_id(rqpair->cm_id, trid, false);
    4954             : }
    4955             : 
    4956             : static int
    4957           0 : nvmf_rdma_qpair_get_listen_trid(struct spdk_nvmf_qpair *qpair,
    4958             :                                 struct spdk_nvme_transport_id *trid)
    4959             : {
    4960             :         struct spdk_nvmf_rdma_qpair     *rqpair;
    4961             : 
    4962           0 :         rqpair = SPDK_CONTAINEROF(qpair, struct spdk_nvmf_rdma_qpair, qpair);
    4963             : 
    4964           0 :         return nvmf_rdma_trid_from_cm_id(rqpair->listen_id, trid, false);
    4965             : }
    4966             : 
    4967             : void
    4968           0 : spdk_nvmf_rdma_init_hooks(struct spdk_nvme_rdma_hooks *hooks)
    4969             : {
    4970           0 :         g_nvmf_hooks = *hooks;
    4971           0 : }
    4972             : 
    4973             : static void
    4974           0 : nvmf_rdma_request_set_abort_status(struct spdk_nvmf_request *req,
    4975             :                                    struct spdk_nvmf_rdma_request *rdma_req_to_abort,
    4976             :                                    struct spdk_nvmf_rdma_qpair *rqpair)
    4977             : {
    4978           0 :         rdma_req_to_abort->req.rsp->nvme_cpl.status.sct = SPDK_NVME_SCT_GENERIC;
    4979           0 :         rdma_req_to_abort->req.rsp->nvme_cpl.status.sc = SPDK_NVME_SC_ABORTED_BY_REQUEST;
    4980             : 
    4981           0 :         STAILQ_INSERT_TAIL(&rqpair->pending_rdma_send_queue, rdma_req_to_abort, state_link);
    4982           0 :         rdma_req_to_abort->state = RDMA_REQUEST_STATE_READY_TO_COMPLETE_PENDING;
    4983             : 
    4984           0 :         req->rsp->nvme_cpl.cdw0 &= ~1U;       /* Command was successfully aborted. */
    4985           0 : }
    4986             : 
    4987             : static int
    4988           0 : _nvmf_rdma_qpair_abort_request(void *ctx)
    4989             : {
    4990           0 :         struct spdk_nvmf_request *req = ctx;
    4991           0 :         struct spdk_nvmf_rdma_request *rdma_req_to_abort = SPDK_CONTAINEROF(
    4992             :                                 req->req_to_abort, struct spdk_nvmf_rdma_request, req);
    4993           0 :         struct spdk_nvmf_rdma_qpair *rqpair = SPDK_CONTAINEROF(req->req_to_abort->qpair,
    4994             :                                               struct spdk_nvmf_rdma_qpair, qpair);
    4995             :         int rc;
    4996             : 
    4997           0 :         spdk_poller_unregister(&req->poller);
    4998             : 
    4999           0 :         switch (rdma_req_to_abort->state) {
    5000           0 :         case RDMA_REQUEST_STATE_EXECUTING:
    5001           0 :                 rc = nvmf_ctrlr_abort_request(req);
    5002           0 :                 if (rc == SPDK_NVMF_REQUEST_EXEC_STATUS_ASYNCHRONOUS) {
    5003           0 :                         return SPDK_POLLER_BUSY;
    5004             :                 }
    5005           0 :                 break;
    5006             : 
    5007           0 :         case RDMA_REQUEST_STATE_NEED_BUFFER:
    5008           0 :                 STAILQ_REMOVE(&rqpair->poller->group->group.pending_buf_queue,
    5009             :                               &rdma_req_to_abort->req, spdk_nvmf_request, buf_link);
    5010             : 
    5011           0 :                 nvmf_rdma_request_set_abort_status(req, rdma_req_to_abort, rqpair);
    5012           0 :                 break;
    5013             : 
    5014           0 :         case RDMA_REQUEST_STATE_DATA_TRANSFER_TO_CONTROLLER_PENDING:
    5015           0 :                 STAILQ_REMOVE(&rqpair->pending_rdma_read_queue, rdma_req_to_abort,
    5016             :                               spdk_nvmf_rdma_request, state_link);
    5017             : 
    5018           0 :                 nvmf_rdma_request_set_abort_status(req, rdma_req_to_abort, rqpair);
    5019           0 :                 break;
    5020             : 
    5021           0 :         case RDMA_REQUEST_STATE_DATA_TRANSFER_TO_HOST_PENDING:
    5022           0 :                 STAILQ_REMOVE(&rqpair->pending_rdma_write_queue, rdma_req_to_abort,
    5023             :                               spdk_nvmf_rdma_request, state_link);
    5024             : 
    5025           0 :                 nvmf_rdma_request_set_abort_status(req, rdma_req_to_abort, rqpair);
    5026           0 :                 break;
    5027             : 
    5028           0 :         case RDMA_REQUEST_STATE_READY_TO_COMPLETE_PENDING:
    5029             :                 /* Remove req from the list here to re-use common function */
    5030           0 :                 STAILQ_REMOVE(&rqpair->pending_rdma_send_queue, rdma_req_to_abort,
    5031             :                               spdk_nvmf_rdma_request, state_link);
    5032             : 
    5033           0 :                 nvmf_rdma_request_set_abort_status(req, rdma_req_to_abort, rqpair);
    5034           0 :                 break;
    5035             : 
    5036           0 :         case RDMA_REQUEST_STATE_TRANSFERRING_HOST_TO_CONTROLLER:
    5037           0 :                 if (spdk_get_ticks() < req->timeout_tsc) {
    5038           0 :                         req->poller = SPDK_POLLER_REGISTER(_nvmf_rdma_qpair_abort_request, req, 0);
    5039           0 :                         return SPDK_POLLER_BUSY;
    5040             :                 }
    5041           0 :                 break;
    5042             : 
    5043           0 :         default:
    5044           0 :                 break;
    5045             :         }
    5046             : 
    5047           0 :         spdk_nvmf_request_complete(req);
    5048           0 :         return SPDK_POLLER_BUSY;
    5049             : }
    5050             : 
    5051             : static void
    5052           0 : nvmf_rdma_qpair_abort_request(struct spdk_nvmf_qpair *qpair,
    5053             :                               struct spdk_nvmf_request *req)
    5054             : {
    5055             :         struct spdk_nvmf_rdma_qpair *rqpair;
    5056             :         struct spdk_nvmf_rdma_transport *rtransport;
    5057             :         struct spdk_nvmf_transport *transport;
    5058             :         uint16_t cid;
    5059             :         uint32_t i, max_req_count;
    5060           0 :         struct spdk_nvmf_rdma_request *rdma_req_to_abort = NULL, *rdma_req;
    5061             : 
    5062           0 :         rqpair = SPDK_CONTAINEROF(qpair, struct spdk_nvmf_rdma_qpair, qpair);
    5063           0 :         rtransport = SPDK_CONTAINEROF(qpair->transport, struct spdk_nvmf_rdma_transport, transport);
    5064           0 :         transport = &rtransport->transport;
    5065             : 
    5066           0 :         cid = req->cmd->nvme_cmd.cdw10_bits.abort.cid;
    5067           0 :         max_req_count = rqpair->srq == NULL ? rqpair->max_queue_depth : rqpair->poller->max_srq_depth;
    5068             : 
    5069           0 :         for (i = 0; i < max_req_count; i++) {
    5070           0 :                 rdma_req = &rqpair->resources->reqs[i];
    5071             :                 /* When SRQ == NULL, rqpair has its own requests and req.qpair pointer always points to the qpair
    5072             :                  * When SRQ != NULL all rqpairs share common requests and qpair pointer is assigned when we start to
    5073             :                  * process a request. So in both cases all requests which are not in FREE state have valid qpair ptr */
    5074           0 :                 if (rdma_req->state != RDMA_REQUEST_STATE_FREE && rdma_req->req.cmd->nvme_cmd.cid == cid &&
    5075           0 :                     rdma_req->req.qpair == qpair) {
    5076           0 :                         rdma_req_to_abort = rdma_req;
    5077           0 :                         break;
    5078             :                 }
    5079             :         }
    5080             : 
    5081           0 :         if (rdma_req_to_abort == NULL) {
    5082           0 :                 spdk_nvmf_request_complete(req);
    5083           0 :                 return;
    5084             :         }
    5085             : 
    5086           0 :         req->req_to_abort = &rdma_req_to_abort->req;
    5087           0 :         req->timeout_tsc = spdk_get_ticks() +
    5088           0 :                            transport->opts.abort_timeout_sec * spdk_get_ticks_hz();
    5089           0 :         req->poller = NULL;
    5090             : 
    5091           0 :         _nvmf_rdma_qpair_abort_request(req);
    5092             : }
    5093             : 
    5094             : static void
    5095           0 : nvmf_rdma_poll_group_dump_stat(struct spdk_nvmf_transport_poll_group *group,
    5096             :                                struct spdk_json_write_ctx *w)
    5097             : {
    5098             :         struct spdk_nvmf_rdma_poll_group *rgroup;
    5099             :         struct spdk_nvmf_rdma_poller *rpoller;
    5100             : 
    5101           0 :         assert(w != NULL);
    5102             : 
    5103           0 :         rgroup = SPDK_CONTAINEROF(group, struct spdk_nvmf_rdma_poll_group, group);
    5104             : 
    5105           0 :         spdk_json_write_named_uint64(w, "pending_data_buffer", rgroup->stat.pending_data_buffer);
    5106             : 
    5107           0 :         spdk_json_write_named_array_begin(w, "devices");
    5108             : 
    5109           0 :         TAILQ_FOREACH(rpoller, &rgroup->pollers, link) {
    5110           0 :                 spdk_json_write_object_begin(w);
    5111           0 :                 spdk_json_write_named_string(w, "name",
    5112           0 :                                              ibv_get_device_name(rpoller->device->context->device));
    5113           0 :                 spdk_json_write_named_uint64(w, "polls",
    5114             :                                              rpoller->stat.polls);
    5115           0 :                 spdk_json_write_named_uint64(w, "idle_polls",
    5116             :                                              rpoller->stat.idle_polls);
    5117           0 :                 spdk_json_write_named_uint64(w, "completions",
    5118             :                                              rpoller->stat.completions);
    5119           0 :                 spdk_json_write_named_uint64(w, "requests",
    5120             :                                              rpoller->stat.requests);
    5121           0 :                 spdk_json_write_named_uint64(w, "request_latency",
    5122             :                                              rpoller->stat.request_latency);
    5123           0 :                 spdk_json_write_named_uint64(w, "pending_free_request",
    5124             :                                              rpoller->stat.pending_free_request);
    5125           0 :                 spdk_json_write_named_uint64(w, "pending_rdma_read",
    5126             :                                              rpoller->stat.pending_rdma_read);
    5127           0 :                 spdk_json_write_named_uint64(w, "pending_rdma_write",
    5128             :                                              rpoller->stat.pending_rdma_write);
    5129           0 :                 spdk_json_write_named_uint64(w, "pending_rdma_send",
    5130             :                                              rpoller->stat.pending_rdma_send);
    5131           0 :                 spdk_json_write_named_uint64(w, "total_send_wrs",
    5132             :                                              rpoller->stat.qp_stats.send.num_submitted_wrs);
    5133           0 :                 spdk_json_write_named_uint64(w, "send_doorbell_updates",
    5134             :                                              rpoller->stat.qp_stats.send.doorbell_updates);
    5135           0 :                 spdk_json_write_named_uint64(w, "total_recv_wrs",
    5136             :                                              rpoller->stat.qp_stats.recv.num_submitted_wrs);
    5137           0 :                 spdk_json_write_named_uint64(w, "recv_doorbell_updates",
    5138             :                                              rpoller->stat.qp_stats.recv.doorbell_updates);
    5139           0 :                 spdk_json_write_object_end(w);
    5140             :         }
    5141             : 
    5142           0 :         spdk_json_write_array_end(w);
    5143           0 : }
    5144             : 
    5145             : const struct spdk_nvmf_transport_ops spdk_nvmf_transport_rdma = {
    5146             :         .name = "RDMA",
    5147             :         .type = SPDK_NVME_TRANSPORT_RDMA,
    5148             :         .opts_init = nvmf_rdma_opts_init,
    5149             :         .create = nvmf_rdma_create,
    5150             :         .dump_opts = nvmf_rdma_dump_opts,
    5151             :         .destroy = nvmf_rdma_destroy,
    5152             : 
    5153             :         .listen = nvmf_rdma_listen,
    5154             :         .stop_listen = nvmf_rdma_stop_listen,
    5155             :         .cdata_init = nvmf_rdma_cdata_init,
    5156             : 
    5157             :         .listener_discover = nvmf_rdma_discover,
    5158             : 
    5159             :         .poll_group_create = nvmf_rdma_poll_group_create,
    5160             :         .get_optimal_poll_group = nvmf_rdma_get_optimal_poll_group,
    5161             :         .poll_group_destroy = nvmf_rdma_poll_group_destroy,
    5162             :         .poll_group_add = nvmf_rdma_poll_group_add,
    5163             :         .poll_group_remove = nvmf_rdma_poll_group_remove,
    5164             :         .poll_group_poll = nvmf_rdma_poll_group_poll,
    5165             : 
    5166             :         .req_free = nvmf_rdma_request_free,
    5167             :         .req_complete = nvmf_rdma_request_complete,
    5168             : 
    5169             :         .qpair_fini = nvmf_rdma_close_qpair,
    5170             :         .qpair_get_peer_trid = nvmf_rdma_qpair_get_peer_trid,
    5171             :         .qpair_get_local_trid = nvmf_rdma_qpair_get_local_trid,
    5172             :         .qpair_get_listen_trid = nvmf_rdma_qpair_get_listen_trid,
    5173             :         .qpair_abort_request = nvmf_rdma_qpair_abort_request,
    5174             : 
    5175             :         .poll_group_dump_stat = nvmf_rdma_poll_group_dump_stat,
    5176             : };
    5177             : 
    5178           2 : SPDK_NVMF_TRANSPORT_REGISTER(rdma, &spdk_nvmf_transport_rdma);
    5179           2 : SPDK_LOG_REGISTER_COMPONENT(rdma)

Generated by: LCOV version 1.15