LCOV - code coverage report
Current view: top level - lib/nvme - nvme_rdma.c (source / functions) Hit Total Coverage
Test: ut_cov_unit.info Lines: 673 1538 43.8 %
Date: 2024-07-12 14:46:53 Functions: 44 88 50.0 %

          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             : /*
       8             :  * NVMe over RDMA transport
       9             :  */
      10             : 
      11             : #include "spdk/stdinc.h"
      12             : 
      13             : #include "spdk/assert.h"
      14             : #include "spdk/dma.h"
      15             : #include "spdk/log.h"
      16             : #include "spdk/trace.h"
      17             : #include "spdk/queue.h"
      18             : #include "spdk/nvme.h"
      19             : #include "spdk/nvmf_spec.h"
      20             : #include "spdk/string.h"
      21             : #include "spdk/endian.h"
      22             : #include "spdk/likely.h"
      23             : #include "spdk/config.h"
      24             : #include "spdk/net.h"
      25             : #include "spdk/file.h"
      26             : 
      27             : #include "nvme_internal.h"
      28             : #include "spdk_internal/rdma_provider.h"
      29             : #include "spdk_internal/rdma_utils.h"
      30             : 
      31             : #define NVME_RDMA_TIME_OUT_IN_MS 2000
      32             : #define NVME_RDMA_RW_BUFFER_SIZE 131072
      33             : 
      34             : /*
      35             :  * NVME RDMA qpair Resource Defaults
      36             :  */
      37             : #define NVME_RDMA_DEFAULT_TX_SGE                2
      38             : #define NVME_RDMA_DEFAULT_RX_SGE                1
      39             : 
      40             : /* Max number of NVMe-oF SGL descriptors supported by the host */
      41             : #define NVME_RDMA_MAX_SGL_DESCRIPTORS           16
      42             : 
      43             : /* number of STAILQ entries for holding pending RDMA CM events. */
      44             : #define NVME_RDMA_NUM_CM_EVENTS                 256
      45             : 
      46             : /* The default size for a shared rdma completion queue. */
      47             : #define DEFAULT_NVME_RDMA_CQ_SIZE               4096
      48             : 
      49             : /*
      50             :  * In the special case of a stale connection we don't expose a mechanism
      51             :  * for the user to retry the connection so we need to handle it internally.
      52             :  */
      53             : #define NVME_RDMA_STALE_CONN_RETRY_MAX          5
      54             : #define NVME_RDMA_STALE_CONN_RETRY_DELAY_US     10000
      55             : 
      56             : /*
      57             :  * Maximum value of transport_retry_count used by RDMA controller
      58             :  */
      59             : #define NVME_RDMA_CTRLR_MAX_TRANSPORT_RETRY_COUNT       7
      60             : 
      61             : /*
      62             :  * Maximum value of transport_ack_timeout used by RDMA controller
      63             :  */
      64             : #define NVME_RDMA_CTRLR_MAX_TRANSPORT_ACK_TIMEOUT       31
      65             : 
      66             : /*
      67             :  * Number of microseconds to wait until the lingering qpair becomes quiet.
      68             :  */
      69             : #define NVME_RDMA_DISCONNECTED_QPAIR_TIMEOUT_US 1000000ull
      70             : 
      71             : /*
      72             :  * The max length of keyed SGL data block (3 bytes)
      73             :  */
      74             : #define NVME_RDMA_MAX_KEYED_SGL_LENGTH ((1u << 24u) - 1)
      75             : 
      76             : #define WC_PER_QPAIR(queue_depth)       (queue_depth * 2)
      77             : 
      78             : #define NVME_RDMA_POLL_GROUP_CHECK_QPN(_rqpair, qpn)                            \
      79             :         ((_rqpair)->rdma_qp && (_rqpair)->rdma_qp->qp->qp_num == (qpn))     \
      80             : 
      81             : enum nvme_rdma_wr_type {
      82             :         RDMA_WR_TYPE_RECV,
      83             :         RDMA_WR_TYPE_SEND,
      84             : };
      85             : 
      86             : struct nvme_rdma_wr {
      87             :         /* Using this instead of the enum allows this struct to only occupy one byte. */
      88             :         uint8_t type;
      89             : };
      90             : 
      91             : struct spdk_nvmf_cmd {
      92             :         struct spdk_nvme_cmd cmd;
      93             :         struct spdk_nvme_sgl_descriptor sgl[NVME_RDMA_MAX_SGL_DESCRIPTORS];
      94             : };
      95             : 
      96             : struct spdk_nvme_rdma_hooks g_nvme_hooks = {};
      97             : 
      98             : /* STAILQ wrapper for cm events. */
      99             : struct nvme_rdma_cm_event_entry {
     100             :         struct rdma_cm_event                    *evt;
     101             :         STAILQ_ENTRY(nvme_rdma_cm_event_entry)  link;
     102             : };
     103             : 
     104             : /* NVMe RDMA transport extensions for spdk_nvme_ctrlr */
     105             : struct nvme_rdma_ctrlr {
     106             :         struct spdk_nvme_ctrlr                  ctrlr;
     107             : 
     108             :         uint16_t                                max_sge;
     109             : 
     110             :         struct rdma_event_channel               *cm_channel;
     111             : 
     112             :         STAILQ_HEAD(, nvme_rdma_cm_event_entry) pending_cm_events;
     113             : 
     114             :         STAILQ_HEAD(, nvme_rdma_cm_event_entry) free_cm_events;
     115             : 
     116             :         struct nvme_rdma_cm_event_entry         *cm_events;
     117             : };
     118             : 
     119             : struct nvme_rdma_poller_stats {
     120             :         uint64_t polls;
     121             :         uint64_t idle_polls;
     122             :         uint64_t queued_requests;
     123             :         uint64_t completions;
     124             :         struct spdk_rdma_provider_qp_stats rdma_stats;
     125             : };
     126             : 
     127             : struct nvme_rdma_poll_group;
     128             : struct nvme_rdma_rsps;
     129             : 
     130             : struct nvme_rdma_poller {
     131             :         struct ibv_context              *device;
     132             :         struct ibv_cq                   *cq;
     133             :         struct spdk_rdma_provider_srq   *srq;
     134             :         struct nvme_rdma_rsps           *rsps;
     135             :         struct ibv_pd                   *pd;
     136             :         struct spdk_rdma_utils_mem_map  *mr_map;
     137             :         uint32_t                        refcnt;
     138             :         int                             required_num_wc;
     139             :         int                             current_num_wc;
     140             :         struct nvme_rdma_poller_stats   stats;
     141             :         struct nvme_rdma_poll_group     *group;
     142             :         STAILQ_ENTRY(nvme_rdma_poller)  link;
     143             : };
     144             : 
     145             : struct nvme_rdma_qpair;
     146             : 
     147             : struct nvme_rdma_poll_group {
     148             :         struct spdk_nvme_transport_poll_group           group;
     149             :         STAILQ_HEAD(, nvme_rdma_poller)                 pollers;
     150             :         uint32_t                                        num_pollers;
     151             :         TAILQ_HEAD(, nvme_rdma_qpair)                   connecting_qpairs;
     152             :         TAILQ_HEAD(, nvme_rdma_qpair)                   active_qpairs;
     153             : };
     154             : 
     155             : enum nvme_rdma_qpair_state {
     156             :         NVME_RDMA_QPAIR_STATE_INVALID = 0,
     157             :         NVME_RDMA_QPAIR_STATE_STALE_CONN,
     158             :         NVME_RDMA_QPAIR_STATE_INITIALIZING,
     159             :         NVME_RDMA_QPAIR_STATE_FABRIC_CONNECT_SEND,
     160             :         NVME_RDMA_QPAIR_STATE_FABRIC_CONNECT_POLL,
     161             :         NVME_RDMA_QPAIR_STATE_RUNNING,
     162             :         NVME_RDMA_QPAIR_STATE_EXITING,
     163             :         NVME_RDMA_QPAIR_STATE_LINGERING,
     164             :         NVME_RDMA_QPAIR_STATE_EXITED,
     165             : };
     166             : 
     167             : typedef int (*nvme_rdma_cm_event_cb)(struct nvme_rdma_qpair *rqpair, int ret);
     168             : 
     169             : struct nvme_rdma_rsp_opts {
     170             :         uint16_t                                num_entries;
     171             :         struct nvme_rdma_qpair                  *rqpair;
     172             :         struct spdk_rdma_provider_srq           *srq;
     173             :         struct spdk_rdma_utils_mem_map          *mr_map;
     174             : };
     175             : 
     176             : struct nvme_rdma_rsps {
     177             :         /* Parallel arrays of response buffers + response SGLs of size num_entries */
     178             :         struct ibv_sge                          *rsp_sgls;
     179             :         struct spdk_nvme_rdma_rsp               *rsps;
     180             : 
     181             :         struct ibv_recv_wr                      *rsp_recv_wrs;
     182             : 
     183             :         /* Count of outstanding recv objects */
     184             :         uint16_t                                current_num_recvs;
     185             : 
     186             :         uint16_t                                num_entries;
     187             : };
     188             : 
     189             : /* NVMe RDMA qpair extensions for spdk_nvme_qpair */
     190             : struct nvme_rdma_qpair {
     191             :         struct spdk_nvme_qpair                  qpair;
     192             : 
     193             :         struct spdk_rdma_provider_qp            *rdma_qp;
     194             :         struct rdma_cm_id                       *cm_id;
     195             :         struct ibv_cq                           *cq;
     196             :         struct spdk_rdma_provider_srq           *srq;
     197             : 
     198             :         struct  spdk_nvme_rdma_req              *rdma_reqs;
     199             : 
     200             :         uint32_t                                max_send_sge;
     201             : 
     202             :         uint32_t                                max_recv_sge;
     203             : 
     204             :         uint16_t                                num_entries;
     205             : 
     206             :         bool                                    delay_cmd_submit;
     207             : 
     208             :         uint32_t                                num_completions;
     209             :         uint32_t                                num_outstanding_reqs;
     210             : 
     211             :         struct nvme_rdma_rsps                   *rsps;
     212             : 
     213             :         /*
     214             :          * Array of num_entries NVMe commands registered as RDMA message buffers.
     215             :          * Indexed by rdma_req->id.
     216             :          */
     217             :         struct spdk_nvmf_cmd                    *cmds;
     218             : 
     219             :         struct spdk_rdma_utils_mem_map          *mr_map;
     220             : 
     221             :         TAILQ_HEAD(, spdk_nvme_rdma_req)        free_reqs;
     222             :         TAILQ_HEAD(, spdk_nvme_rdma_req)        outstanding_reqs;
     223             : 
     224             :         struct spdk_memory_domain               *memory_domain;
     225             : 
     226             :         /* Count of outstanding send objects */
     227             :         uint16_t                                current_num_sends;
     228             : 
     229             :         TAILQ_ENTRY(nvme_rdma_qpair)            link_active;
     230             : 
     231             :         /* Placed at the end of the struct since it is not used frequently */
     232             :         struct rdma_cm_event                    *evt;
     233             :         struct nvme_rdma_poller                 *poller;
     234             : 
     235             :         uint64_t                                evt_timeout_ticks;
     236             :         nvme_rdma_cm_event_cb                   evt_cb;
     237             :         enum rdma_cm_event_type                 expected_evt_type;
     238             : 
     239             :         enum nvme_rdma_qpair_state              state;
     240             : 
     241             :         bool                                    in_connect_poll;
     242             : 
     243             :         uint8_t                                 stale_conn_retry_count;
     244             :         bool                                    need_destroy;
     245             : 
     246             :         TAILQ_ENTRY(nvme_rdma_qpair)            link_connecting;
     247             : };
     248             : 
     249             : enum NVME_RDMA_COMPLETION_FLAGS {
     250             :         NVME_RDMA_SEND_COMPLETED = 1u << 0,
     251             :         NVME_RDMA_RECV_COMPLETED = 1u << 1,
     252             : };
     253             : 
     254             : struct spdk_nvme_rdma_req {
     255             :         uint16_t                                id;
     256             :         uint16_t                                completion_flags: 2;
     257             :         uint16_t                                reserved: 14;
     258             :         /* if completion of RDMA_RECV received before RDMA_SEND, we will complete nvme request
     259             :          * during processing of RDMA_SEND. To complete the request we must know the response
     260             :          * received in RDMA_RECV, so store it in this field */
     261             :         struct spdk_nvme_rdma_rsp               *rdma_rsp;
     262             : 
     263             :         struct nvme_rdma_wr                     rdma_wr;
     264             : 
     265             :         struct ibv_send_wr                      send_wr;
     266             : 
     267             :         struct nvme_request                     *req;
     268             : 
     269             :         struct ibv_sge                          send_sgl[NVME_RDMA_DEFAULT_TX_SGE];
     270             : 
     271             :         TAILQ_ENTRY(spdk_nvme_rdma_req)         link;
     272             : };
     273             : 
     274             : struct spdk_nvme_rdma_rsp {
     275             :         struct spdk_nvme_cpl    cpl;
     276             :         struct nvme_rdma_qpair  *rqpair;
     277             :         struct ibv_recv_wr      *recv_wr;
     278             :         struct nvme_rdma_wr     rdma_wr;
     279             : };
     280             : 
     281             : struct nvme_rdma_memory_translation_ctx {
     282             :         void *addr;
     283             :         size_t length;
     284             :         uint32_t lkey;
     285             :         uint32_t rkey;
     286             : };
     287             : 
     288             : static const char *rdma_cm_event_str[] = {
     289             :         "RDMA_CM_EVENT_ADDR_RESOLVED",
     290             :         "RDMA_CM_EVENT_ADDR_ERROR",
     291             :         "RDMA_CM_EVENT_ROUTE_RESOLVED",
     292             :         "RDMA_CM_EVENT_ROUTE_ERROR",
     293             :         "RDMA_CM_EVENT_CONNECT_REQUEST",
     294             :         "RDMA_CM_EVENT_CONNECT_RESPONSE",
     295             :         "RDMA_CM_EVENT_CONNECT_ERROR",
     296             :         "RDMA_CM_EVENT_UNREACHABLE",
     297             :         "RDMA_CM_EVENT_REJECTED",
     298             :         "RDMA_CM_EVENT_ESTABLISHED",
     299             :         "RDMA_CM_EVENT_DISCONNECTED",
     300             :         "RDMA_CM_EVENT_DEVICE_REMOVAL",
     301             :         "RDMA_CM_EVENT_MULTICAST_JOIN",
     302             :         "RDMA_CM_EVENT_MULTICAST_ERROR",
     303             :         "RDMA_CM_EVENT_ADDR_CHANGE",
     304             :         "RDMA_CM_EVENT_TIMEWAIT_EXIT"
     305             : };
     306             : 
     307             : static struct nvme_rdma_poller *nvme_rdma_poll_group_get_poller(struct nvme_rdma_poll_group *group,
     308             :                 struct ibv_context *device);
     309             : static void nvme_rdma_poll_group_put_poller(struct nvme_rdma_poll_group *group,
     310             :                 struct nvme_rdma_poller *poller);
     311             : 
     312             : static int nvme_rdma_ctrlr_delete_io_qpair(struct spdk_nvme_ctrlr *ctrlr,
     313             :                 struct spdk_nvme_qpair *qpair);
     314             : 
     315             : static inline struct nvme_rdma_qpair *
     316          18 : nvme_rdma_qpair(struct spdk_nvme_qpair *qpair)
     317             : {
     318          18 :         assert(qpair->trtype == SPDK_NVME_TRANSPORT_RDMA);
     319          18 :         return SPDK_CONTAINEROF(qpair, struct nvme_rdma_qpair, qpair);
     320             : }
     321             : 
     322             : static inline struct nvme_rdma_poll_group *
     323           8 : nvme_rdma_poll_group(struct spdk_nvme_transport_poll_group *group)
     324             : {
     325           8 :         return (SPDK_CONTAINEROF(group, struct nvme_rdma_poll_group, group));
     326             : }
     327             : 
     328             : static inline struct nvme_rdma_ctrlr *
     329           8 : nvme_rdma_ctrlr(struct spdk_nvme_ctrlr *ctrlr)
     330             : {
     331           8 :         assert(ctrlr->trid.trtype == SPDK_NVME_TRANSPORT_RDMA);
     332           8 :         return SPDK_CONTAINEROF(ctrlr, struct nvme_rdma_ctrlr, ctrlr);
     333             : }
     334             : 
     335             : static struct spdk_nvme_rdma_req *
     336           3 : nvme_rdma_req_get(struct nvme_rdma_qpair *rqpair)
     337             : {
     338             :         struct spdk_nvme_rdma_req *rdma_req;
     339             : 
     340           3 :         rdma_req = TAILQ_FIRST(&rqpair->free_reqs);
     341           3 :         if (rdma_req) {
     342           2 :                 TAILQ_REMOVE(&rqpair->free_reqs, rdma_req, link);
     343             :         }
     344             : 
     345           3 :         return rdma_req;
     346             : }
     347             : 
     348             : static void
     349           1 : nvme_rdma_req_put(struct nvme_rdma_qpair *rqpair, struct spdk_nvme_rdma_req *rdma_req)
     350             : {
     351           1 :         rdma_req->completion_flags = 0;
     352           1 :         rdma_req->req = NULL;
     353           1 :         rdma_req->rdma_rsp = NULL;
     354           1 :         TAILQ_INSERT_HEAD(&rqpair->free_reqs, rdma_req, link);
     355           1 : }
     356             : 
     357             : static void
     358           0 : nvme_rdma_req_complete(struct spdk_nvme_rdma_req *rdma_req,
     359             :                        struct spdk_nvme_cpl *rsp,
     360             :                        bool print_on_error)
     361             : {
     362           0 :         struct nvme_request *req = rdma_req->req;
     363             :         struct nvme_rdma_qpair *rqpair;
     364             :         struct spdk_nvme_qpair *qpair;
     365             :         bool error, print_error;
     366             : 
     367           0 :         assert(req != NULL);
     368             : 
     369           0 :         qpair = req->qpair;
     370           0 :         rqpair = nvme_rdma_qpair(qpair);
     371             : 
     372           0 :         error = spdk_nvme_cpl_is_error(rsp);
     373           0 :         print_error = error && print_on_error && !qpair->ctrlr->opts.disable_error_logging;
     374             : 
     375           0 :         if (print_error) {
     376           0 :                 spdk_nvme_qpair_print_command(qpair, &req->cmd);
     377             :         }
     378             : 
     379           0 :         if (print_error || SPDK_DEBUGLOG_FLAG_ENABLED("nvme")) {
     380           0 :                 spdk_nvme_qpair_print_completion(qpair, rsp);
     381             :         }
     382             : 
     383           0 :         assert(rqpair->num_outstanding_reqs > 0);
     384           0 :         rqpair->num_outstanding_reqs--;
     385             : 
     386           0 :         TAILQ_REMOVE(&rqpair->outstanding_reqs, rdma_req, link);
     387             : 
     388           0 :         nvme_complete_request(req->cb_fn, req->cb_arg, qpair, req, rsp);
     389           0 :         nvme_rdma_req_put(rqpair, rdma_req);
     390           0 : }
     391             : 
     392             : static const char *
     393           4 : nvme_rdma_cm_event_str_get(uint32_t event)
     394             : {
     395           4 :         if (event < SPDK_COUNTOF(rdma_cm_event_str)) {
     396           4 :                 return rdma_cm_event_str[event];
     397             :         } else {
     398           0 :                 return "Undefined";
     399             :         }
     400             : }
     401             : 
     402             : 
     403             : static int
     404          12 : nvme_rdma_qpair_process_cm_event(struct nvme_rdma_qpair *rqpair)
     405             : {
     406          12 :         struct rdma_cm_event                            *event = rqpair->evt;
     407             :         struct spdk_nvmf_rdma_accept_private_data       *accept_data;
     408          12 :         int                                             rc = 0;
     409             : 
     410          12 :         if (event) {
     411          12 :                 switch (event->event) {
     412           1 :                 case RDMA_CM_EVENT_ADDR_RESOLVED:
     413             :                 case RDMA_CM_EVENT_ADDR_ERROR:
     414             :                 case RDMA_CM_EVENT_ROUTE_RESOLVED:
     415             :                 case RDMA_CM_EVENT_ROUTE_ERROR:
     416           1 :                         break;
     417           1 :                 case RDMA_CM_EVENT_CONNECT_REQUEST:
     418           1 :                         break;
     419           1 :                 case RDMA_CM_EVENT_CONNECT_ERROR:
     420           1 :                         break;
     421           1 :                 case RDMA_CM_EVENT_UNREACHABLE:
     422             :                 case RDMA_CM_EVENT_REJECTED:
     423           1 :                         break;
     424           2 :                 case RDMA_CM_EVENT_CONNECT_RESPONSE:
     425           2 :                         rc = spdk_rdma_provider_qp_complete_connect(rqpair->rdma_qp);
     426             :                 /* fall through */
     427           2 :                 case RDMA_CM_EVENT_ESTABLISHED:
     428           2 :                         accept_data = (struct spdk_nvmf_rdma_accept_private_data *)event->param.conn.private_data;
     429           2 :                         if (accept_data == NULL) {
     430           1 :                                 rc = -1;
     431             :                         } else {
     432           1 :                                 SPDK_DEBUGLOG(nvme, "Requested queue depth %d. Target receive queue depth %d.\n",
     433             :                                               rqpair->num_entries + 1, accept_data->crqsize);
     434             :                         }
     435           2 :                         break;
     436           1 :                 case RDMA_CM_EVENT_DISCONNECTED:
     437           1 :                         rqpair->qpair.transport_failure_reason = SPDK_NVME_QPAIR_FAILURE_REMOTE;
     438           1 :                         break;
     439           1 :                 case RDMA_CM_EVENT_DEVICE_REMOVAL:
     440           1 :                         rqpair->qpair.transport_failure_reason = SPDK_NVME_QPAIR_FAILURE_LOCAL;
     441           1 :                         rqpair->need_destroy = true;
     442           1 :                         break;
     443           1 :                 case RDMA_CM_EVENT_MULTICAST_JOIN:
     444             :                 case RDMA_CM_EVENT_MULTICAST_ERROR:
     445           1 :                         break;
     446           1 :                 case RDMA_CM_EVENT_ADDR_CHANGE:
     447           1 :                         rqpair->qpair.transport_failure_reason = SPDK_NVME_QPAIR_FAILURE_LOCAL;
     448           1 :                         break;
     449           1 :                 case RDMA_CM_EVENT_TIMEWAIT_EXIT:
     450           1 :                         break;
     451           1 :                 default:
     452           1 :                         SPDK_ERRLOG("Unexpected Acceptor Event [%d]\n", event->event);
     453           1 :                         break;
     454             :                 }
     455          12 :                 rqpair->evt = NULL;
     456          12 :                 rdma_ack_cm_event(event);
     457             :         }
     458             : 
     459          12 :         return rc;
     460             : }
     461             : 
     462             : /*
     463             :  * This function must be called under the nvme controller's lock
     464             :  * because it touches global controller variables. The lock is taken
     465             :  * by the generic transport code before invoking a few of the functions
     466             :  * in this file: nvme_rdma_ctrlr_connect_qpair, nvme_rdma_ctrlr_delete_io_qpair,
     467             :  * and conditionally nvme_rdma_qpair_process_completions when it is calling
     468             :  * completions on the admin qpair. When adding a new call to this function, please
     469             :  * verify that it is in a situation where it falls under the lock.
     470             :  */
     471             : static int
     472           0 : nvme_rdma_poll_events(struct nvme_rdma_ctrlr *rctrlr)
     473             : {
     474             :         struct nvme_rdma_cm_event_entry *entry, *tmp;
     475             :         struct nvme_rdma_qpair          *event_qpair;
     476           0 :         struct rdma_cm_event            *event;
     477           0 :         struct rdma_event_channel       *channel = rctrlr->cm_channel;
     478             : 
     479           0 :         STAILQ_FOREACH_SAFE(entry, &rctrlr->pending_cm_events, link, tmp) {
     480           0 :                 event_qpair = entry->evt->id->context;
     481           0 :                 if (event_qpair->evt == NULL) {
     482           0 :                         event_qpair->evt = entry->evt;
     483           0 :                         STAILQ_REMOVE(&rctrlr->pending_cm_events, entry, nvme_rdma_cm_event_entry, link);
     484           0 :                         STAILQ_INSERT_HEAD(&rctrlr->free_cm_events, entry, link);
     485             :                 }
     486             :         }
     487             : 
     488           0 :         while (rdma_get_cm_event(channel, &event) == 0) {
     489           0 :                 event_qpair = event->id->context;
     490           0 :                 if (event_qpair->evt == NULL) {
     491           0 :                         event_qpair->evt = event;
     492             :                 } else {
     493           0 :                         assert(rctrlr == nvme_rdma_ctrlr(event_qpair->qpair.ctrlr));
     494           0 :                         entry = STAILQ_FIRST(&rctrlr->free_cm_events);
     495           0 :                         if (entry == NULL) {
     496           0 :                                 rdma_ack_cm_event(event);
     497           0 :                                 return -ENOMEM;
     498             :                         }
     499           0 :                         STAILQ_REMOVE(&rctrlr->free_cm_events, entry, nvme_rdma_cm_event_entry, link);
     500           0 :                         entry->evt = event;
     501           0 :                         STAILQ_INSERT_TAIL(&rctrlr->pending_cm_events, entry, link);
     502             :                 }
     503             :         }
     504             : 
     505             :         /* rdma_get_cm_event() returns -1 on error. If an error occurs, errno
     506             :          * will be set to indicate the failure reason. So return negated errno here.
     507             :          */
     508           0 :         return -errno;
     509             : }
     510             : 
     511             : static int
     512           4 : nvme_rdma_validate_cm_event(enum rdma_cm_event_type expected_evt_type,
     513             :                             struct rdma_cm_event *reaped_evt)
     514             : {
     515           4 :         int rc = -EBADMSG;
     516             : 
     517           4 :         if (expected_evt_type == reaped_evt->event) {
     518           1 :                 return 0;
     519             :         }
     520             : 
     521           3 :         switch (expected_evt_type) {
     522           2 :         case RDMA_CM_EVENT_ESTABLISHED:
     523             :                 /*
     524             :                  * There is an enum ib_cm_rej_reason in the kernel headers that sets 10 as
     525             :                  * IB_CM_REJ_STALE_CONN. I can't find the corresponding userspace but we get
     526             :                  * the same values here.
     527             :                  */
     528           2 :                 if (reaped_evt->event == RDMA_CM_EVENT_REJECTED && reaped_evt->status == 10) {
     529           1 :                         rc = -ESTALE;
     530           1 :                 } else if (reaped_evt->event == RDMA_CM_EVENT_CONNECT_RESPONSE) {
     531             :                         /*
     532             :                          *  If we are using a qpair which is not created using rdma cm API
     533             :                          *  then we will receive RDMA_CM_EVENT_CONNECT_RESPONSE instead of
     534             :                          *  RDMA_CM_EVENT_ESTABLISHED.
     535             :                          */
     536           1 :                         return 0;
     537             :                 }
     538           1 :                 break;
     539           1 :         default:
     540           1 :                 break;
     541             :         }
     542             : 
     543           2 :         SPDK_ERRLOG("Expected %s but received %s (%d) from CM event channel (status = %d)\n",
     544             :                     nvme_rdma_cm_event_str_get(expected_evt_type),
     545             :                     nvme_rdma_cm_event_str_get(reaped_evt->event), reaped_evt->event,
     546             :                     reaped_evt->status);
     547           2 :         return rc;
     548             : }
     549             : 
     550             : static int
     551           0 : nvme_rdma_process_event_start(struct nvme_rdma_qpair *rqpair,
     552             :                               enum rdma_cm_event_type evt,
     553             :                               nvme_rdma_cm_event_cb evt_cb)
     554             : {
     555             :         int     rc;
     556             : 
     557           0 :         assert(evt_cb != NULL);
     558             : 
     559           0 :         if (rqpair->evt != NULL) {
     560           0 :                 rc = nvme_rdma_qpair_process_cm_event(rqpair);
     561           0 :                 if (rc) {
     562           0 :                         return rc;
     563             :                 }
     564             :         }
     565             : 
     566           0 :         rqpair->expected_evt_type = evt;
     567           0 :         rqpair->evt_cb = evt_cb;
     568           0 :         rqpair->evt_timeout_ticks = (g_spdk_nvme_transport_opts.rdma_cm_event_timeout_ms * 1000 *
     569           0 :                                      spdk_get_ticks_hz()) / SPDK_SEC_TO_USEC + spdk_get_ticks();
     570             : 
     571           0 :         return 0;
     572             : }
     573             : 
     574             : static int
     575           0 : nvme_rdma_process_event_poll(struct nvme_rdma_qpair *rqpair)
     576             : {
     577             :         struct nvme_rdma_ctrlr  *rctrlr;
     578           0 :         int     rc = 0, rc2;
     579             : 
     580           0 :         rctrlr = nvme_rdma_ctrlr(rqpair->qpair.ctrlr);
     581           0 :         assert(rctrlr != NULL);
     582             : 
     583           0 :         if (!rqpair->evt && spdk_get_ticks() < rqpair->evt_timeout_ticks) {
     584           0 :                 rc = nvme_rdma_poll_events(rctrlr);
     585           0 :                 if (rc == -EAGAIN || rc == -EWOULDBLOCK) {
     586           0 :                         return rc;
     587             :                 }
     588             :         }
     589             : 
     590           0 :         if (rqpair->evt == NULL) {
     591           0 :                 rc = -EADDRNOTAVAIL;
     592           0 :                 goto exit;
     593             :         }
     594             : 
     595           0 :         rc = nvme_rdma_validate_cm_event(rqpair->expected_evt_type, rqpair->evt);
     596             : 
     597           0 :         rc2 = nvme_rdma_qpair_process_cm_event(rqpair);
     598             :         /* bad message takes precedence over the other error codes from processing the event. */
     599           0 :         rc = rc == 0 ? rc2 : rc;
     600             : 
     601           0 : exit:
     602           0 :         assert(rqpair->evt_cb != NULL);
     603           0 :         return rqpair->evt_cb(rqpair, rc);
     604             : }
     605             : 
     606             : static int
     607           3 : nvme_rdma_resize_cq(struct nvme_rdma_qpair *rqpair, struct nvme_rdma_poller *poller)
     608             : {
     609             :         int     current_num_wc, required_num_wc;
     610             :         int     max_cq_size;
     611             : 
     612           3 :         required_num_wc = poller->required_num_wc + WC_PER_QPAIR(rqpair->num_entries);
     613           3 :         current_num_wc = poller->current_num_wc;
     614           3 :         if (current_num_wc < required_num_wc) {
     615           2 :                 current_num_wc = spdk_max(current_num_wc * 2, required_num_wc);
     616             :         }
     617             : 
     618           3 :         max_cq_size = g_spdk_nvme_transport_opts.rdma_max_cq_size;
     619           3 :         if (max_cq_size != 0 && current_num_wc > max_cq_size) {
     620           0 :                 current_num_wc = max_cq_size;
     621             :         }
     622             : 
     623           3 :         if (poller->current_num_wc != current_num_wc) {
     624           2 :                 SPDK_DEBUGLOG(nvme, "Resize RDMA CQ from %d to %d\n", poller->current_num_wc,
     625             :                               current_num_wc);
     626           2 :                 if (ibv_resize_cq(poller->cq, current_num_wc)) {
     627           1 :                         SPDK_ERRLOG("RDMA CQ resize failed: errno %d: %s\n", errno, spdk_strerror(errno));
     628           1 :                         return -1;
     629             :                 }
     630             : 
     631           1 :                 poller->current_num_wc = current_num_wc;
     632             :         }
     633             : 
     634           2 :         poller->required_num_wc = required_num_wc;
     635           2 :         return 0;
     636             : }
     637             : 
     638             : static int
     639           5 : nvme_rdma_qpair_set_poller(struct spdk_nvme_qpair *qpair)
     640             : {
     641           5 :         struct nvme_rdma_qpair          *rqpair = nvme_rdma_qpair(qpair);
     642           5 :         struct nvme_rdma_poll_group     *group = nvme_rdma_poll_group(qpair->poll_group);
     643             :         struct nvme_rdma_poller         *poller;
     644             : 
     645           5 :         assert(rqpair->cq == NULL);
     646             : 
     647           5 :         poller = nvme_rdma_poll_group_get_poller(group, rqpair->cm_id->verbs);
     648           5 :         if (!poller) {
     649           2 :                 SPDK_ERRLOG("Unable to find a cq for qpair %p on poll group %p\n", qpair, qpair->poll_group);
     650           2 :                 return -EINVAL;
     651             :         }
     652             : 
     653           3 :         if (!poller->srq) {
     654           3 :                 if (nvme_rdma_resize_cq(rqpair, poller)) {
     655           1 :                         nvme_rdma_poll_group_put_poller(group, poller);
     656           1 :                         return -EPROTO;
     657             :                 }
     658             :         }
     659             : 
     660           2 :         rqpair->cq = poller->cq;
     661           2 :         rqpair->srq = poller->srq;
     662           2 :         if (rqpair->srq) {
     663           0 :                 rqpair->rsps = poller->rsps;
     664             :         }
     665           2 :         rqpair->poller = poller;
     666           2 :         return 0;
     667             : }
     668             : 
     669             : static int
     670           1 : nvme_rdma_qpair_init(struct nvme_rdma_qpair *rqpair)
     671             : {
     672             :         int                     rc;
     673           1 :         struct spdk_rdma_provider_qp_init_attr  attr = {};
     674           1 :         struct ibv_device_attr  dev_attr;
     675             :         struct nvme_rdma_ctrlr  *rctrlr;
     676             :         uint32_t num_cqe, max_num_cqe;
     677             : 
     678           1 :         rc = ibv_query_device(rqpair->cm_id->verbs, &dev_attr);
     679           1 :         if (rc != 0) {
     680           0 :                 SPDK_ERRLOG("Failed to query RDMA device attributes.\n");
     681           0 :                 return -1;
     682             :         }
     683             : 
     684           1 :         if (rqpair->qpair.poll_group) {
     685           0 :                 assert(!rqpair->cq);
     686           0 :                 rc = nvme_rdma_qpair_set_poller(&rqpair->qpair);
     687           0 :                 if (rc) {
     688           0 :                         SPDK_ERRLOG("Unable to activate the rdmaqpair.\n");
     689           0 :                         return -1;
     690             :                 }
     691           0 :                 assert(rqpair->cq);
     692             :         } else {
     693           1 :                 num_cqe = rqpair->num_entries * 2;
     694           1 :                 max_num_cqe = g_spdk_nvme_transport_opts.rdma_max_cq_size;
     695           1 :                 if (max_num_cqe != 0 && num_cqe > max_num_cqe) {
     696           0 :                         num_cqe = max_num_cqe;
     697             :                 }
     698           1 :                 rqpair->cq = ibv_create_cq(rqpair->cm_id->verbs, num_cqe, rqpair, NULL, 0);
     699           1 :                 if (!rqpair->cq) {
     700           0 :                         SPDK_ERRLOG("Unable to create completion queue: errno %d: %s\n", errno, spdk_strerror(errno));
     701           0 :                         return -1;
     702             :                 }
     703             :         }
     704             : 
     705           1 :         rctrlr = nvme_rdma_ctrlr(rqpair->qpair.ctrlr);
     706           1 :         if (g_nvme_hooks.get_ibv_pd) {
     707           0 :                 attr.pd = g_nvme_hooks.get_ibv_pd(&rctrlr->ctrlr.trid, rqpair->cm_id->verbs);
     708             :         } else {
     709           1 :                 attr.pd = spdk_rdma_utils_get_pd(rqpair->cm_id->verbs);
     710             :         }
     711             : 
     712           1 :         attr.stats =            rqpair->poller ? &rqpair->poller->stats.rdma_stats : NULL;
     713           1 :         attr.send_cq            = rqpair->cq;
     714           1 :         attr.recv_cq            = rqpair->cq;
     715           1 :         attr.cap.max_send_wr    = rqpair->num_entries; /* SEND operations */
     716           1 :         if (rqpair->srq) {
     717           0 :                 attr.srq        = rqpair->srq->srq;
     718             :         } else {
     719           1 :                 attr.cap.max_recv_wr = rqpair->num_entries; /* RECV operations */
     720             :         }
     721           1 :         attr.cap.max_send_sge   = spdk_min(NVME_RDMA_DEFAULT_TX_SGE, dev_attr.max_sge);
     722           1 :         attr.cap.max_recv_sge   = spdk_min(NVME_RDMA_DEFAULT_RX_SGE, dev_attr.max_sge);
     723             : 
     724           1 :         rqpair->rdma_qp = spdk_rdma_provider_qp_create(rqpair->cm_id, &attr);
     725             : 
     726           1 :         if (!rqpair->rdma_qp) {
     727           0 :                 return -1;
     728             :         }
     729             : 
     730           1 :         rqpair->memory_domain = spdk_rdma_utils_get_memory_domain(rqpair->rdma_qp->qp->pd);
     731           1 :         if (!rqpair->memory_domain) {
     732           0 :                 SPDK_ERRLOG("Failed to get memory domain\n");
     733           0 :                 return -1;
     734             :         }
     735             : 
     736             :         /* ibv_create_qp will change the values in attr.cap. Make sure we store the proper value. */
     737           1 :         rqpair->max_send_sge = spdk_min(NVME_RDMA_DEFAULT_TX_SGE, attr.cap.max_send_sge);
     738           1 :         rqpair->max_recv_sge = spdk_min(NVME_RDMA_DEFAULT_RX_SGE, attr.cap.max_recv_sge);
     739           1 :         rqpair->current_num_sends = 0;
     740             : 
     741           1 :         rqpair->cm_id->context = rqpair;
     742             : 
     743           1 :         return 0;
     744             : }
     745             : 
     746             : static void
     747           0 : nvme_rdma_reset_failed_sends(struct nvme_rdma_qpair *rqpair,
     748             :                              struct ibv_send_wr *bad_send_wr, int rc)
     749             : {
     750           0 :         SPDK_ERRLOG("Failed to post WRs on send queue, errno %d (%s), bad_wr %p\n",
     751             :                     rc, spdk_strerror(rc), bad_send_wr);
     752           0 :         while (bad_send_wr != NULL) {
     753           0 :                 assert(rqpair->current_num_sends > 0);
     754           0 :                 rqpair->current_num_sends--;
     755           0 :                 bad_send_wr = bad_send_wr->next;
     756             :         }
     757           0 : }
     758             : 
     759             : static void
     760           0 : nvme_rdma_reset_failed_recvs(struct nvme_rdma_rsps *rsps,
     761             :                              struct ibv_recv_wr *bad_recv_wr, int rc)
     762             : {
     763           0 :         SPDK_ERRLOG("Failed to post WRs on receive queue, errno %d (%s), bad_wr %p\n",
     764             :                     rc, spdk_strerror(rc), bad_recv_wr);
     765           0 :         while (bad_recv_wr != NULL) {
     766           0 :                 assert(rsps->current_num_recvs > 0);
     767           0 :                 rsps->current_num_recvs--;
     768           0 :                 bad_recv_wr = bad_recv_wr->next;
     769             :         }
     770           0 : }
     771             : 
     772             : static inline int
     773           1 : nvme_rdma_qpair_submit_sends(struct nvme_rdma_qpair *rqpair)
     774             : {
     775           1 :         struct ibv_send_wr *bad_send_wr = NULL;
     776             :         int rc;
     777             : 
     778           1 :         rc = spdk_rdma_provider_qp_flush_send_wrs(rqpair->rdma_qp, &bad_send_wr);
     779             : 
     780           1 :         if (spdk_unlikely(rc)) {
     781           0 :                 nvme_rdma_reset_failed_sends(rqpair, bad_send_wr, rc);
     782             :         }
     783             : 
     784           1 :         return rc;
     785             : }
     786             : 
     787             : static inline int
     788           0 : nvme_rdma_qpair_submit_recvs(struct nvme_rdma_qpair *rqpair)
     789             : {
     790           0 :         struct ibv_recv_wr *bad_recv_wr;
     791           0 :         int rc = 0;
     792             : 
     793           0 :         rc = spdk_rdma_provider_qp_flush_recv_wrs(rqpair->rdma_qp, &bad_recv_wr);
     794           0 :         if (spdk_unlikely(rc)) {
     795           0 :                 nvme_rdma_reset_failed_recvs(rqpair->rsps, bad_recv_wr, rc);
     796             :         }
     797             : 
     798           0 :         return rc;
     799             : }
     800             : 
     801             : static inline int
     802           0 : nvme_rdma_poller_submit_recvs(struct nvme_rdma_poller *poller)
     803             : {
     804           0 :         struct ibv_recv_wr *bad_recv_wr;
     805             :         int rc;
     806             : 
     807           0 :         rc = spdk_rdma_provider_srq_flush_recv_wrs(poller->srq, &bad_recv_wr);
     808           0 :         if (spdk_unlikely(rc)) {
     809           0 :                 nvme_rdma_reset_failed_recvs(poller->rsps, bad_recv_wr, rc);
     810             :         }
     811             : 
     812           0 :         return rc;
     813             : }
     814             : 
     815             : #define nvme_rdma_trace_ibv_sge(sg_list) \
     816             :         if (sg_list) { \
     817             :                 SPDK_DEBUGLOG(nvme, "local addr %p length 0x%x lkey 0x%x\n", \
     818             :                               (void *)(sg_list)->addr, (sg_list)->length, (sg_list)->lkey); \
     819             :         }
     820             : 
     821             : static void
     822           3 : nvme_rdma_free_rsps(struct nvme_rdma_rsps *rsps)
     823             : {
     824           3 :         if (!rsps) {
     825           1 :                 return;
     826             :         }
     827             : 
     828           2 :         spdk_free(rsps->rsps);
     829           2 :         spdk_free(rsps->rsp_sgls);
     830           2 :         spdk_free(rsps->rsp_recv_wrs);
     831           2 :         spdk_free(rsps);
     832             : }
     833             : 
     834             : static struct nvme_rdma_rsps *
     835           2 : nvme_rdma_create_rsps(struct nvme_rdma_rsp_opts *opts)
     836             : {
     837             :         struct nvme_rdma_rsps *rsps;
     838           2 :         struct spdk_rdma_utils_memory_translation translation;
     839             :         uint16_t i;
     840             :         int rc;
     841             : 
     842           2 :         rsps = spdk_zmalloc(sizeof(*rsps), 0, NULL, SPDK_ENV_SOCKET_ID_ANY, SPDK_MALLOC_DMA);
     843           2 :         if (!rsps) {
     844           0 :                 SPDK_ERRLOG("Failed to allocate rsps object\n");
     845           0 :                 return NULL;
     846             :         }
     847             : 
     848           2 :         rsps->rsp_sgls = spdk_zmalloc(opts->num_entries * sizeof(*rsps->rsp_sgls), 0, NULL,
     849             :                                       SPDK_ENV_SOCKET_ID_ANY, SPDK_MALLOC_DMA);
     850           2 :         if (!rsps->rsp_sgls) {
     851           1 :                 SPDK_ERRLOG("Failed to allocate rsp_sgls\n");
     852           1 :                 goto fail;
     853             :         }
     854             : 
     855           1 :         rsps->rsp_recv_wrs = spdk_zmalloc(opts->num_entries * sizeof(*rsps->rsp_recv_wrs), 0, NULL,
     856             :                                           SPDK_ENV_SOCKET_ID_ANY, SPDK_MALLOC_DMA);
     857           1 :         if (!rsps->rsp_recv_wrs) {
     858           0 :                 SPDK_ERRLOG("Failed to allocate rsp_recv_wrs\n");
     859           0 :                 goto fail;
     860             :         }
     861             : 
     862           1 :         rsps->rsps = spdk_zmalloc(opts->num_entries * sizeof(*rsps->rsps), 0, NULL,
     863             :                                   SPDK_ENV_SOCKET_ID_ANY, SPDK_MALLOC_DMA);
     864           1 :         if (!rsps->rsps) {
     865           0 :                 SPDK_ERRLOG("can not allocate rdma rsps\n");
     866           0 :                 goto fail;
     867             :         }
     868             : 
     869           2 :         for (i = 0; i < opts->num_entries; i++) {
     870           1 :                 struct ibv_sge *rsp_sgl = &rsps->rsp_sgls[i];
     871           1 :                 struct spdk_nvme_rdma_rsp *rsp = &rsps->rsps[i];
     872           1 :                 struct ibv_recv_wr *recv_wr = &rsps->rsp_recv_wrs[i];
     873             : 
     874           1 :                 rsp->rqpair = opts->rqpair;
     875           1 :                 rsp->rdma_wr.type = RDMA_WR_TYPE_RECV;
     876           1 :                 rsp->recv_wr = recv_wr;
     877           1 :                 rsp_sgl->addr = (uint64_t)rsp;
     878           1 :                 rsp_sgl->length = sizeof(struct spdk_nvme_cpl);
     879           1 :                 rc = spdk_rdma_utils_get_translation(opts->mr_map, rsp, sizeof(*rsp), &translation);
     880           1 :                 if (rc) {
     881           0 :                         goto fail;
     882             :                 }
     883           1 :                 rsp_sgl->lkey = spdk_rdma_utils_memory_translation_get_lkey(&translation);
     884             : 
     885           1 :                 recv_wr->wr_id = (uint64_t)&rsp->rdma_wr;
     886           1 :                 recv_wr->next = NULL;
     887           1 :                 recv_wr->sg_list = rsp_sgl;
     888           1 :                 recv_wr->num_sge = 1;
     889             : 
     890           1 :                 nvme_rdma_trace_ibv_sge(recv_wr->sg_list);
     891             : 
     892           1 :                 if (opts->rqpair) {
     893           1 :                         spdk_rdma_provider_qp_queue_recv_wrs(opts->rqpair->rdma_qp, recv_wr);
     894             :                 } else {
     895           0 :                         spdk_rdma_provider_srq_queue_recv_wrs(opts->srq, recv_wr);
     896             :                 }
     897             :         }
     898             : 
     899           1 :         rsps->num_entries = opts->num_entries;
     900           1 :         rsps->current_num_recvs = opts->num_entries;
     901             : 
     902           1 :         return rsps;
     903           1 : fail:
     904           1 :         nvme_rdma_free_rsps(rsps);
     905           1 :         return NULL;
     906             : }
     907             : 
     908             : static void
     909           3 : nvme_rdma_free_reqs(struct nvme_rdma_qpair *rqpair)
     910             : {
     911           3 :         if (!rqpair->rdma_reqs) {
     912           2 :                 return;
     913             :         }
     914             : 
     915           1 :         spdk_free(rqpair->cmds);
     916           1 :         rqpair->cmds = NULL;
     917             : 
     918           1 :         spdk_free(rqpair->rdma_reqs);
     919           1 :         rqpair->rdma_reqs = NULL;
     920             : }
     921             : 
     922             : static int
     923           4 : nvme_rdma_create_reqs(struct nvme_rdma_qpair *rqpair)
     924             : {
     925           4 :         struct spdk_rdma_utils_memory_translation translation;
     926             :         uint16_t i;
     927             :         int rc;
     928             : 
     929           4 :         assert(!rqpair->rdma_reqs);
     930           4 :         rqpair->rdma_reqs = spdk_zmalloc(rqpair->num_entries * sizeof(struct spdk_nvme_rdma_req), 0, NULL,
     931             :                                          SPDK_ENV_SOCKET_ID_ANY, SPDK_MALLOC_DMA);
     932           4 :         if (rqpair->rdma_reqs == NULL) {
     933           1 :                 SPDK_ERRLOG("Failed to allocate rdma_reqs\n");
     934           1 :                 goto fail;
     935             :         }
     936             : 
     937           3 :         assert(!rqpair->cmds);
     938           3 :         rqpair->cmds = spdk_zmalloc(rqpair->num_entries * sizeof(*rqpair->cmds), 0, NULL,
     939             :                                     SPDK_ENV_SOCKET_ID_ANY, SPDK_MALLOC_DMA);
     940           3 :         if (!rqpair->cmds) {
     941           0 :                 SPDK_ERRLOG("Failed to allocate RDMA cmds\n");
     942           0 :                 goto fail;
     943             :         }
     944             : 
     945           3 :         TAILQ_INIT(&rqpair->free_reqs);
     946           3 :         TAILQ_INIT(&rqpair->outstanding_reqs);
     947          10 :         for (i = 0; i < rqpair->num_entries; i++) {
     948             :                 struct spdk_nvme_rdma_req       *rdma_req;
     949             :                 struct spdk_nvmf_cmd            *cmd;
     950             : 
     951           7 :                 rdma_req = &rqpair->rdma_reqs[i];
     952           7 :                 rdma_req->rdma_wr.type = RDMA_WR_TYPE_SEND;
     953           7 :                 cmd = &rqpair->cmds[i];
     954             : 
     955           7 :                 rdma_req->id = i;
     956             : 
     957           7 :                 rc = spdk_rdma_utils_get_translation(rqpair->mr_map, cmd, sizeof(*cmd), &translation);
     958           7 :                 if (rc) {
     959           0 :                         goto fail;
     960             :                 }
     961           7 :                 rdma_req->send_sgl[0].lkey = spdk_rdma_utils_memory_translation_get_lkey(&translation);
     962             : 
     963             :                 /* The first RDMA sgl element will always point
     964             :                  * at this data structure. Depending on whether
     965             :                  * an NVMe-oF SGL is required, the length of
     966             :                  * this element may change. */
     967           7 :                 rdma_req->send_sgl[0].addr = (uint64_t)cmd;
     968           7 :                 rdma_req->send_wr.wr_id = (uint64_t)&rdma_req->rdma_wr;
     969           7 :                 rdma_req->send_wr.next = NULL;
     970           7 :                 rdma_req->send_wr.opcode = IBV_WR_SEND;
     971           7 :                 rdma_req->send_wr.send_flags = IBV_SEND_SIGNALED;
     972           7 :                 rdma_req->send_wr.sg_list = rdma_req->send_sgl;
     973           7 :                 rdma_req->send_wr.imm_data = 0;
     974             : 
     975           7 :                 TAILQ_INSERT_TAIL(&rqpair->free_reqs, rdma_req, link);
     976             :         }
     977             : 
     978           3 :         return 0;
     979           1 : fail:
     980           1 :         nvme_rdma_free_reqs(rqpair);
     981           1 :         return -ENOMEM;
     982             : }
     983             : 
     984             : static int nvme_rdma_connect(struct nvme_rdma_qpair *rqpair);
     985             : 
     986             : static int
     987           0 : nvme_rdma_route_resolved(struct nvme_rdma_qpair *rqpair, int ret)
     988             : {
     989           0 :         if (ret) {
     990           0 :                 SPDK_ERRLOG("RDMA route resolution error\n");
     991           0 :                 return -1;
     992             :         }
     993             : 
     994           0 :         ret = nvme_rdma_qpair_init(rqpair);
     995           0 :         if (ret < 0) {
     996           0 :                 SPDK_ERRLOG("nvme_rdma_qpair_init() failed\n");
     997           0 :                 return -1;
     998             :         }
     999             : 
    1000           0 :         return nvme_rdma_connect(rqpair);
    1001             : }
    1002             : 
    1003             : static int
    1004           0 : nvme_rdma_addr_resolved(struct nvme_rdma_qpair *rqpair, int ret)
    1005             : {
    1006           0 :         if (ret) {
    1007           0 :                 SPDK_ERRLOG("RDMA address resolution error\n");
    1008           0 :                 return -1;
    1009             :         }
    1010             : 
    1011           0 :         if (rqpair->qpair.ctrlr->opts.transport_ack_timeout != SPDK_NVME_TRANSPORT_ACK_TIMEOUT_DISABLED) {
    1012             : #ifdef SPDK_CONFIG_RDMA_SET_ACK_TIMEOUT
    1013             :                 uint8_t timeout = rqpair->qpair.ctrlr->opts.transport_ack_timeout;
    1014             :                 ret = rdma_set_option(rqpair->cm_id, RDMA_OPTION_ID,
    1015             :                                       RDMA_OPTION_ID_ACK_TIMEOUT,
    1016             :                                       &timeout, sizeof(timeout));
    1017             :                 if (ret) {
    1018             :                         SPDK_NOTICELOG("Can't apply RDMA_OPTION_ID_ACK_TIMEOUT %d, ret %d\n", timeout, ret);
    1019             :                 }
    1020             : #else
    1021           0 :                 SPDK_DEBUGLOG(nvme, "transport_ack_timeout is not supported\n");
    1022             : #endif
    1023             :         }
    1024             : 
    1025           0 :         if (rqpair->qpair.ctrlr->opts.transport_tos != SPDK_NVME_TRANSPORT_TOS_DISABLED) {
    1026             : #ifdef SPDK_CONFIG_RDMA_SET_TOS
    1027           0 :                 uint8_t tos = rqpair->qpair.ctrlr->opts.transport_tos;
    1028           0 :                 ret = rdma_set_option(rqpair->cm_id, RDMA_OPTION_ID, RDMA_OPTION_ID_TOS, &tos, sizeof(tos));
    1029           0 :                 if (ret) {
    1030           0 :                         SPDK_NOTICELOG("Can't apply RDMA_OPTION_ID_TOS %u, ret %d\n", tos, ret);
    1031             :                 }
    1032             : #else
    1033             :                 SPDK_DEBUGLOG(nvme, "transport_tos is not supported\n");
    1034             : #endif
    1035             :         }
    1036             : 
    1037           0 :         ret = rdma_resolve_route(rqpair->cm_id, NVME_RDMA_TIME_OUT_IN_MS);
    1038           0 :         if (ret) {
    1039           0 :                 SPDK_ERRLOG("rdma_resolve_route\n");
    1040           0 :                 return ret;
    1041             :         }
    1042             : 
    1043           0 :         return nvme_rdma_process_event_start(rqpair, RDMA_CM_EVENT_ROUTE_RESOLVED,
    1044             :                                              nvme_rdma_route_resolved);
    1045             : }
    1046             : 
    1047             : static int
    1048           0 : nvme_rdma_resolve_addr(struct nvme_rdma_qpair *rqpair,
    1049             :                        struct sockaddr *src_addr,
    1050             :                        struct sockaddr *dst_addr)
    1051             : {
    1052             :         int ret;
    1053             : 
    1054           0 :         if (src_addr) {
    1055           0 :                 int reuse = 1;
    1056             : 
    1057           0 :                 ret = rdma_set_option(rqpair->cm_id, RDMA_OPTION_ID, RDMA_OPTION_ID_REUSEADDR,
    1058             :                                       &reuse, sizeof(reuse));
    1059           0 :                 if (ret) {
    1060           0 :                         SPDK_NOTICELOG("Can't apply RDMA_OPTION_ID_REUSEADDR %d, ret %d\n",
    1061             :                                        reuse, ret);
    1062             :                         /* It is likely that rdma_resolve_addr() returns -EADDRINUSE, but
    1063             :                          * we may missing something. We rely on rdma_resolve_addr().
    1064             :                          */
    1065             :                 }
    1066             :         }
    1067             : 
    1068           0 :         ret = rdma_resolve_addr(rqpair->cm_id, src_addr, dst_addr,
    1069             :                                 NVME_RDMA_TIME_OUT_IN_MS);
    1070           0 :         if (ret) {
    1071           0 :                 SPDK_ERRLOG("rdma_resolve_addr, %d\n", errno);
    1072           0 :                 return ret;
    1073             :         }
    1074             : 
    1075           0 :         return nvme_rdma_process_event_start(rqpair, RDMA_CM_EVENT_ADDR_RESOLVED,
    1076             :                                              nvme_rdma_addr_resolved);
    1077             : }
    1078             : 
    1079             : static int nvme_rdma_stale_conn_retry(struct nvme_rdma_qpair *rqpair);
    1080             : 
    1081             : static int
    1082           0 : nvme_rdma_connect_established(struct nvme_rdma_qpair *rqpair, int ret)
    1083             : {
    1084           0 :         struct nvme_rdma_rsp_opts opts = {};
    1085             : 
    1086           0 :         if (ret == -ESTALE) {
    1087           0 :                 return nvme_rdma_stale_conn_retry(rqpair);
    1088           0 :         } else if (ret) {
    1089           0 :                 SPDK_ERRLOG("RDMA connect error %d\n", ret);
    1090           0 :                 return ret;
    1091             :         }
    1092             : 
    1093           0 :         assert(!rqpair->mr_map);
    1094           0 :         rqpair->mr_map = spdk_rdma_utils_create_mem_map(rqpair->rdma_qp->qp->pd, &g_nvme_hooks,
    1095             :                          IBV_ACCESS_LOCAL_WRITE | IBV_ACCESS_REMOTE_READ | IBV_ACCESS_REMOTE_WRITE);
    1096           0 :         if (!rqpair->mr_map) {
    1097           0 :                 SPDK_ERRLOG("Unable to register RDMA memory translation map\n");
    1098           0 :                 return -1;
    1099             :         }
    1100             : 
    1101           0 :         ret = nvme_rdma_create_reqs(rqpair);
    1102           0 :         SPDK_DEBUGLOG(nvme, "rc =%d\n", ret);
    1103           0 :         if (ret) {
    1104           0 :                 SPDK_ERRLOG("Unable to create rqpair RDMA requests\n");
    1105           0 :                 return -1;
    1106             :         }
    1107           0 :         SPDK_DEBUGLOG(nvme, "RDMA requests created\n");
    1108             : 
    1109           0 :         if (!rqpair->srq) {
    1110           0 :                 opts.num_entries = rqpair->num_entries;
    1111           0 :                 opts.rqpair = rqpair;
    1112           0 :                 opts.srq = NULL;
    1113           0 :                 opts.mr_map = rqpair->mr_map;
    1114             : 
    1115           0 :                 assert(!rqpair->rsps);
    1116           0 :                 rqpair->rsps = nvme_rdma_create_rsps(&opts);
    1117           0 :                 if (!rqpair->rsps) {
    1118           0 :                         SPDK_ERRLOG("Unable to create rqpair RDMA responses\n");
    1119           0 :                         return -1;
    1120             :                 }
    1121           0 :                 SPDK_DEBUGLOG(nvme, "RDMA responses created\n");
    1122             : 
    1123           0 :                 ret = nvme_rdma_qpair_submit_recvs(rqpair);
    1124           0 :                 SPDK_DEBUGLOG(nvme, "rc =%d\n", ret);
    1125           0 :                 if (ret) {
    1126           0 :                         SPDK_ERRLOG("Unable to submit rqpair RDMA responses\n");
    1127           0 :                         return -1;
    1128             :                 }
    1129           0 :                 SPDK_DEBUGLOG(nvme, "RDMA responses submitted\n");
    1130             :         }
    1131             : 
    1132           0 :         rqpair->state = NVME_RDMA_QPAIR_STATE_FABRIC_CONNECT_SEND;
    1133             : 
    1134           0 :         return 0;
    1135             : }
    1136             : 
    1137             : static int
    1138           0 : nvme_rdma_connect(struct nvme_rdma_qpair *rqpair)
    1139             : {
    1140           0 :         struct rdma_conn_param                          param = {};
    1141           0 :         struct spdk_nvmf_rdma_request_private_data      request_data = {};
    1142           0 :         struct ibv_device_attr                          attr;
    1143             :         int                                             ret;
    1144             :         struct spdk_nvme_ctrlr                          *ctrlr;
    1145             :         struct sockaddr                                 *sa;
    1146           0 :         uint32_t                                        numa_socket_id;
    1147           0 :         char                                            host[64];
    1148           0 :         char                                            ifc[64];
    1149             : 
    1150           0 :         ret = ibv_query_device(rqpair->cm_id->verbs, &attr);
    1151           0 :         if (ret != 0) {
    1152           0 :                 SPDK_ERRLOG("Failed to query RDMA device attributes.\n");
    1153           0 :                 return ret;
    1154             :         }
    1155             : 
    1156           0 :         param.responder_resources = attr.max_qp_rd_atom;
    1157             : 
    1158           0 :         ctrlr = rqpair->qpair.ctrlr;
    1159           0 :         if (!ctrlr) {
    1160           0 :                 return -1;
    1161             :         }
    1162             : 
    1163           0 :         request_data.qid = rqpair->qpair.id;
    1164           0 :         request_data.hrqsize = rqpair->num_entries + 1;
    1165           0 :         request_data.hsqsize = rqpair->num_entries;
    1166           0 :         request_data.cntlid = ctrlr->cntlid;
    1167             : 
    1168           0 :         param.private_data = &request_data;
    1169           0 :         param.private_data_len = sizeof(request_data);
    1170           0 :         param.retry_count = ctrlr->opts.transport_retry_count;
    1171           0 :         param.rnr_retry_count = 7;
    1172             : 
    1173             :         /* Fields below are ignored by rdma cm if qpair has been
    1174             :          * created using rdma cm API. */
    1175           0 :         param.srq = 0;
    1176           0 :         param.qp_num = rqpair->rdma_qp->qp->qp_num;
    1177             : 
    1178           0 :         ret = rdma_connect(rqpair->cm_id, &param);
    1179           0 :         if (ret) {
    1180           0 :                 SPDK_ERRLOG("nvme rdma connect error\n");
    1181           0 :                 return ret;
    1182             :         }
    1183             : 
    1184           0 :         sa = rdma_get_local_addr(rqpair->cm_id);
    1185           0 :         if (sa == NULL) {
    1186           0 :                 goto out;
    1187             :         }
    1188           0 :         ret = spdk_net_get_address_string(sa, host, sizeof(host));
    1189           0 :         if (ret != 0) {
    1190           0 :                 goto out;
    1191             :         }
    1192           0 :         ret = spdk_net_get_interface_name(host, ifc, sizeof(ifc));
    1193           0 :         if (ret != 0) {
    1194           0 :                 goto out;
    1195             :         }
    1196           0 :         ret = spdk_read_sysfs_attribute_uint32(&numa_socket_id,
    1197             :                                                "/sys/class/net/%s/device/numa_node", ifc);
    1198           0 :         if (ret == 0) {
    1199           0 :                 ctrlr->socket_id_valid = true;
    1200           0 :                 ctrlr->socket_id = numa_socket_id;
    1201             :         }
    1202             : 
    1203           0 : out:
    1204           0 :         return nvme_rdma_process_event_start(rqpair, RDMA_CM_EVENT_ESTABLISHED,
    1205             :                                              nvme_rdma_connect_established);
    1206             : }
    1207             : 
    1208             : static int
    1209           0 : nvme_rdma_ctrlr_connect_qpair(struct spdk_nvme_ctrlr *ctrlr, struct spdk_nvme_qpair *qpair)
    1210             : {
    1211           0 :         struct sockaddr_storage dst_addr;
    1212           0 :         struct sockaddr_storage src_addr;
    1213             :         bool src_addr_specified;
    1214           0 :         long int port, src_port;
    1215             :         int rc;
    1216             :         struct nvme_rdma_ctrlr *rctrlr;
    1217             :         struct nvme_rdma_qpair *rqpair;
    1218             :         struct nvme_rdma_poll_group *group;
    1219             :         int family;
    1220             : 
    1221           0 :         rqpair = nvme_rdma_qpair(qpair);
    1222           0 :         rctrlr = nvme_rdma_ctrlr(ctrlr);
    1223           0 :         assert(rctrlr != NULL);
    1224             : 
    1225           0 :         switch (ctrlr->trid.adrfam) {
    1226           0 :         case SPDK_NVMF_ADRFAM_IPV4:
    1227           0 :                 family = AF_INET;
    1228           0 :                 break;
    1229           0 :         case SPDK_NVMF_ADRFAM_IPV6:
    1230           0 :                 family = AF_INET6;
    1231           0 :                 break;
    1232           0 :         default:
    1233           0 :                 SPDK_ERRLOG("Unhandled ADRFAM %d\n", ctrlr->trid.adrfam);
    1234           0 :                 return -1;
    1235             :         }
    1236             : 
    1237           0 :         SPDK_DEBUGLOG(nvme, "adrfam %d ai_family %d\n", ctrlr->trid.adrfam, family);
    1238             : 
    1239           0 :         memset(&dst_addr, 0, sizeof(dst_addr));
    1240             : 
    1241           0 :         SPDK_DEBUGLOG(nvme, "trsvcid is %s\n", ctrlr->trid.trsvcid);
    1242           0 :         rc = nvme_parse_addr(&dst_addr, family, ctrlr->trid.traddr, ctrlr->trid.trsvcid, &port);
    1243           0 :         if (rc != 0) {
    1244           0 :                 SPDK_ERRLOG("dst_addr nvme_parse_addr() failed\n");
    1245           0 :                 return -1;
    1246             :         }
    1247             : 
    1248           0 :         if (ctrlr->opts.src_addr[0] || ctrlr->opts.src_svcid[0]) {
    1249           0 :                 memset(&src_addr, 0, sizeof(src_addr));
    1250           0 :                 rc = nvme_parse_addr(&src_addr, family, ctrlr->opts.src_addr, ctrlr->opts.src_svcid, &src_port);
    1251           0 :                 if (rc != 0) {
    1252           0 :                         SPDK_ERRLOG("src_addr nvme_parse_addr() failed\n");
    1253           0 :                         return -1;
    1254             :                 }
    1255           0 :                 src_addr_specified = true;
    1256             :         } else {
    1257           0 :                 src_addr_specified = false;
    1258             :         }
    1259             : 
    1260           0 :         rc = rdma_create_id(rctrlr->cm_channel, &rqpair->cm_id, rqpair, RDMA_PS_TCP);
    1261           0 :         if (rc < 0) {
    1262           0 :                 SPDK_ERRLOG("rdma_create_id() failed\n");
    1263           0 :                 return -1;
    1264             :         }
    1265             : 
    1266           0 :         rc = nvme_rdma_resolve_addr(rqpair,
    1267             :                                     src_addr_specified ? (struct sockaddr *)&src_addr : NULL,
    1268             :                                     (struct sockaddr *)&dst_addr);
    1269           0 :         if (rc < 0) {
    1270           0 :                 SPDK_ERRLOG("nvme_rdma_resolve_addr() failed\n");
    1271           0 :                 return -1;
    1272             :         }
    1273             : 
    1274           0 :         rqpair->state = NVME_RDMA_QPAIR_STATE_INITIALIZING;
    1275             : 
    1276           0 :         if (qpair->poll_group != NULL) {
    1277           0 :                 group = nvme_rdma_poll_group(qpair->poll_group);
    1278           0 :                 TAILQ_INSERT_TAIL(&group->connecting_qpairs, rqpair, link_connecting);
    1279             :         }
    1280             : 
    1281           0 :         return 0;
    1282             : }
    1283             : 
    1284             : static int
    1285           0 : nvme_rdma_stale_conn_reconnect(struct nvme_rdma_qpair *rqpair)
    1286             : {
    1287           0 :         struct spdk_nvme_qpair *qpair = &rqpair->qpair;
    1288             : 
    1289           0 :         if (spdk_get_ticks() < rqpair->evt_timeout_ticks) {
    1290           0 :                 return -EAGAIN;
    1291             :         }
    1292             : 
    1293           0 :         return nvme_rdma_ctrlr_connect_qpair(qpair->ctrlr, qpair);
    1294             : }
    1295             : 
    1296             : static int
    1297           0 : nvme_rdma_ctrlr_connect_qpair_poll(struct spdk_nvme_ctrlr *ctrlr,
    1298             :                                    struct spdk_nvme_qpair *qpair)
    1299             : {
    1300           0 :         struct nvme_rdma_qpair *rqpair = nvme_rdma_qpair(qpair);
    1301             :         int rc;
    1302             : 
    1303           0 :         if (rqpair->in_connect_poll) {
    1304           0 :                 return -EAGAIN;
    1305             :         }
    1306             : 
    1307           0 :         rqpair->in_connect_poll = true;
    1308             : 
    1309           0 :         switch (rqpair->state) {
    1310           0 :         case NVME_RDMA_QPAIR_STATE_INVALID:
    1311           0 :                 rc = -EAGAIN;
    1312           0 :                 break;
    1313             : 
    1314           0 :         case NVME_RDMA_QPAIR_STATE_INITIALIZING:
    1315             :         case NVME_RDMA_QPAIR_STATE_EXITING:
    1316           0 :                 if (!nvme_qpair_is_admin_queue(qpair)) {
    1317           0 :                         nvme_ctrlr_lock(ctrlr);
    1318             :                 }
    1319             : 
    1320           0 :                 rc = nvme_rdma_process_event_poll(rqpair);
    1321             : 
    1322           0 :                 if (!nvme_qpair_is_admin_queue(qpair)) {
    1323           0 :                         nvme_ctrlr_unlock(ctrlr);
    1324             :                 }
    1325             : 
    1326           0 :                 if (rc == 0) {
    1327           0 :                         rc = -EAGAIN;
    1328             :                 }
    1329           0 :                 rqpair->in_connect_poll = false;
    1330             : 
    1331           0 :                 return rc;
    1332             : 
    1333           0 :         case NVME_RDMA_QPAIR_STATE_STALE_CONN:
    1334           0 :                 rc = nvme_rdma_stale_conn_reconnect(rqpair);
    1335           0 :                 if (rc == 0) {
    1336           0 :                         rc = -EAGAIN;
    1337             :                 }
    1338           0 :                 break;
    1339           0 :         case NVME_RDMA_QPAIR_STATE_FABRIC_CONNECT_SEND:
    1340           0 :                 rc = nvme_fabric_qpair_connect_async(qpair, rqpair->num_entries + 1);
    1341           0 :                 if (rc == 0) {
    1342           0 :                         rqpair->state = NVME_RDMA_QPAIR_STATE_FABRIC_CONNECT_POLL;
    1343           0 :                         rc = -EAGAIN;
    1344             :                 } else {
    1345           0 :                         SPDK_ERRLOG("Failed to send an NVMe-oF Fabric CONNECT command\n");
    1346             :                 }
    1347           0 :                 break;
    1348           0 :         case NVME_RDMA_QPAIR_STATE_FABRIC_CONNECT_POLL:
    1349           0 :                 rc = nvme_fabric_qpair_connect_poll(qpair);
    1350           0 :                 if (rc == 0) {
    1351           0 :                         rqpair->state = NVME_RDMA_QPAIR_STATE_RUNNING;
    1352           0 :                         nvme_qpair_set_state(qpair, NVME_QPAIR_CONNECTED);
    1353           0 :                 } else if (rc != -EAGAIN) {
    1354           0 :                         SPDK_ERRLOG("Failed to poll NVMe-oF Fabric CONNECT command\n");
    1355             :                 }
    1356           0 :                 break;
    1357           0 :         case NVME_RDMA_QPAIR_STATE_RUNNING:
    1358           0 :                 rc = 0;
    1359           0 :                 break;
    1360           0 :         default:
    1361           0 :                 assert(false);
    1362             :                 rc = -EINVAL;
    1363             :                 break;
    1364             :         }
    1365             : 
    1366           0 :         rqpair->in_connect_poll = false;
    1367             : 
    1368           0 :         return rc;
    1369             : }
    1370             : 
    1371             : static inline int
    1372          28 : nvme_rdma_get_memory_translation(struct nvme_request *req, struct nvme_rdma_qpair *rqpair,
    1373             :                                  struct nvme_rdma_memory_translation_ctx *_ctx)
    1374             : {
    1375          28 :         struct spdk_memory_domain_translation_ctx ctx;
    1376          28 :         struct spdk_memory_domain_translation_result dma_translation = {.iov_count = 0};
    1377          28 :         struct spdk_rdma_utils_memory_translation rdma_translation;
    1378             :         int rc;
    1379             : 
    1380          28 :         assert(req);
    1381          28 :         assert(rqpair);
    1382          28 :         assert(_ctx);
    1383             : 
    1384          28 :         if (req->payload.opts && req->payload.opts->memory_domain) {
    1385           2 :                 ctx.size = sizeof(struct spdk_memory_domain_translation_ctx);
    1386           2 :                 ctx.rdma.ibv_qp = rqpair->rdma_qp->qp;
    1387           2 :                 dma_translation.size = sizeof(struct spdk_memory_domain_translation_result);
    1388             : 
    1389           2 :                 rc = spdk_memory_domain_translate_data(req->payload.opts->memory_domain,
    1390           2 :                                                        req->payload.opts->memory_domain_ctx,
    1391             :                                                        rqpair->memory_domain, &ctx, _ctx->addr,
    1392             :                                                        _ctx->length, &dma_translation);
    1393           2 :                 if (spdk_unlikely(rc) || dma_translation.iov_count != 1) {
    1394           1 :                         SPDK_ERRLOG("DMA memory translation failed, rc %d, iov count %u\n", rc, dma_translation.iov_count);
    1395           1 :                         return rc;
    1396             :                 }
    1397             : 
    1398           1 :                 _ctx->lkey = dma_translation.rdma.lkey;
    1399           1 :                 _ctx->rkey = dma_translation.rdma.rkey;
    1400           1 :                 _ctx->addr = dma_translation.iov.iov_base;
    1401           1 :                 _ctx->length = dma_translation.iov.iov_len;
    1402             :         } else {
    1403          26 :                 rc = spdk_rdma_utils_get_translation(rqpair->mr_map, _ctx->addr, _ctx->length, &rdma_translation);
    1404          26 :                 if (spdk_unlikely(rc)) {
    1405           2 :                         SPDK_ERRLOG("RDMA memory translation failed, rc %d\n", rc);
    1406           2 :                         return rc;
    1407             :                 }
    1408          24 :                 if (rdma_translation.translation_type == SPDK_RDMA_UTILS_TRANSLATION_MR) {
    1409          24 :                         _ctx->lkey = rdma_translation.mr_or_key.mr->lkey;
    1410          24 :                         _ctx->rkey = rdma_translation.mr_or_key.mr->rkey;
    1411             :                 } else {
    1412           0 :                         _ctx->lkey = _ctx->rkey = (uint32_t)rdma_translation.mr_or_key.key;
    1413             :                 }
    1414             :         }
    1415             : 
    1416          25 :         return 0;
    1417             : }
    1418             : 
    1419             : 
    1420             : /*
    1421             :  * Build SGL describing empty payload.
    1422             :  */
    1423             : static int
    1424           2 : nvme_rdma_build_null_request(struct spdk_nvme_rdma_req *rdma_req)
    1425             : {
    1426           2 :         struct nvme_request *req = rdma_req->req;
    1427             : 
    1428           2 :         req->cmd.psdt = SPDK_NVME_PSDT_SGL_MPTR_CONTIG;
    1429             : 
    1430             :         /* The first element of this SGL is pointing at an
    1431             :          * spdk_nvmf_cmd object. For this particular command,
    1432             :          * we only need the first 64 bytes corresponding to
    1433             :          * the NVMe command. */
    1434           2 :         rdma_req->send_sgl[0].length = sizeof(struct spdk_nvme_cmd);
    1435             : 
    1436             :         /* The RDMA SGL needs one element describing the NVMe command. */
    1437           2 :         rdma_req->send_wr.num_sge = 1;
    1438             : 
    1439           2 :         req->cmd.dptr.sgl1.keyed.type = SPDK_NVME_SGL_TYPE_KEYED_DATA_BLOCK;
    1440           2 :         req->cmd.dptr.sgl1.keyed.subtype = SPDK_NVME_SGL_SUBTYPE_ADDRESS;
    1441           2 :         req->cmd.dptr.sgl1.keyed.length = 0;
    1442           2 :         req->cmd.dptr.sgl1.keyed.key = 0;
    1443           2 :         req->cmd.dptr.sgl1.address = 0;
    1444             : 
    1445           2 :         return 0;
    1446             : }
    1447             : 
    1448             : /*
    1449             :  * Build inline SGL describing contiguous payload buffer.
    1450             :  */
    1451             : static int
    1452           3 : nvme_rdma_build_contig_inline_request(struct nvme_rdma_qpair *rqpair,
    1453             :                                       struct spdk_nvme_rdma_req *rdma_req)
    1454             : {
    1455           3 :         struct nvme_request *req = rdma_req->req;
    1456           3 :         struct nvme_rdma_memory_translation_ctx ctx = {
    1457           3 :                 .addr = (uint8_t *)req->payload.contig_or_cb_arg + req->payload_offset,
    1458           3 :                 .length = req->payload_size
    1459             :         };
    1460             :         int rc;
    1461             : 
    1462           3 :         assert(ctx.length != 0);
    1463           3 :         assert(nvme_payload_type(&req->payload) == NVME_PAYLOAD_TYPE_CONTIG);
    1464             : 
    1465           3 :         rc = nvme_rdma_get_memory_translation(req, rqpair, &ctx);
    1466           3 :         if (spdk_unlikely(rc)) {
    1467           0 :                 return -1;
    1468             :         }
    1469             : 
    1470           3 :         rdma_req->send_sgl[1].lkey = ctx.lkey;
    1471             : 
    1472             :         /* The first element of this SGL is pointing at an
    1473             :          * spdk_nvmf_cmd object. For this particular command,
    1474             :          * we only need the first 64 bytes corresponding to
    1475             :          * the NVMe command. */
    1476           3 :         rdma_req->send_sgl[0].length = sizeof(struct spdk_nvme_cmd);
    1477             : 
    1478           3 :         rdma_req->send_sgl[1].addr = (uint64_t)ctx.addr;
    1479           3 :         rdma_req->send_sgl[1].length = (uint32_t)ctx.length;
    1480             : 
    1481             :         /* The RDMA SGL contains two elements. The first describes
    1482             :          * the NVMe command and the second describes the data
    1483             :          * payload. */
    1484           3 :         rdma_req->send_wr.num_sge = 2;
    1485             : 
    1486           3 :         req->cmd.psdt = SPDK_NVME_PSDT_SGL_MPTR_CONTIG;
    1487           3 :         req->cmd.dptr.sgl1.unkeyed.type = SPDK_NVME_SGL_TYPE_DATA_BLOCK;
    1488           3 :         req->cmd.dptr.sgl1.unkeyed.subtype = SPDK_NVME_SGL_SUBTYPE_OFFSET;
    1489           3 :         req->cmd.dptr.sgl1.unkeyed.length = (uint32_t)ctx.length;
    1490             :         /* Inline only supported for icdoff == 0 currently.  This function will
    1491             :          * not get called for controllers with other values. */
    1492           3 :         req->cmd.dptr.sgl1.address = (uint64_t)0;
    1493             : 
    1494           3 :         return 0;
    1495             : }
    1496             : 
    1497             : /*
    1498             :  * Build SGL describing contiguous payload buffer.
    1499             :  */
    1500             : static int
    1501           3 : nvme_rdma_build_contig_request(struct nvme_rdma_qpair *rqpair,
    1502             :                                struct spdk_nvme_rdma_req *rdma_req)
    1503             : {
    1504           3 :         struct nvme_request *req = rdma_req->req;
    1505           3 :         struct nvme_rdma_memory_translation_ctx ctx = {
    1506           3 :                 .addr = (uint8_t *)req->payload.contig_or_cb_arg + req->payload_offset,
    1507           3 :                 .length = req->payload_size
    1508             :         };
    1509             :         int rc;
    1510             : 
    1511           3 :         assert(req->payload_size != 0);
    1512           3 :         assert(nvme_payload_type(&req->payload) == NVME_PAYLOAD_TYPE_CONTIG);
    1513             : 
    1514           3 :         if (spdk_unlikely(req->payload_size > NVME_RDMA_MAX_KEYED_SGL_LENGTH)) {
    1515           1 :                 SPDK_ERRLOG("SGL length %u exceeds max keyed SGL block size %u\n",
    1516             :                             req->payload_size, NVME_RDMA_MAX_KEYED_SGL_LENGTH);
    1517           1 :                 return -1;
    1518             :         }
    1519             : 
    1520           2 :         rc = nvme_rdma_get_memory_translation(req, rqpair, &ctx);
    1521           2 :         if (spdk_unlikely(rc)) {
    1522           0 :                 return -1;
    1523             :         }
    1524             : 
    1525           2 :         req->cmd.dptr.sgl1.keyed.key = ctx.rkey;
    1526             : 
    1527             :         /* The first element of this SGL is pointing at an
    1528             :          * spdk_nvmf_cmd object. For this particular command,
    1529             :          * we only need the first 64 bytes corresponding to
    1530             :          * the NVMe command. */
    1531           2 :         rdma_req->send_sgl[0].length = sizeof(struct spdk_nvme_cmd);
    1532             : 
    1533             :         /* The RDMA SGL needs one element describing the NVMe command. */
    1534           2 :         rdma_req->send_wr.num_sge = 1;
    1535             : 
    1536           2 :         req->cmd.psdt = SPDK_NVME_PSDT_SGL_MPTR_CONTIG;
    1537           2 :         req->cmd.dptr.sgl1.keyed.type = SPDK_NVME_SGL_TYPE_KEYED_DATA_BLOCK;
    1538           2 :         req->cmd.dptr.sgl1.keyed.subtype = SPDK_NVME_SGL_SUBTYPE_ADDRESS;
    1539           2 :         req->cmd.dptr.sgl1.keyed.length = (uint32_t)ctx.length;
    1540           2 :         req->cmd.dptr.sgl1.address = (uint64_t)ctx.addr;
    1541             : 
    1542           2 :         return 0;
    1543             : }
    1544             : 
    1545             : /*
    1546             :  * Build SGL describing scattered payload buffer.
    1547             :  */
    1548             : static int
    1549           7 : nvme_rdma_build_sgl_request(struct nvme_rdma_qpair *rqpair,
    1550             :                             struct spdk_nvme_rdma_req *rdma_req)
    1551             : {
    1552           7 :         struct nvme_request *req = rdma_req->req;
    1553           7 :         struct spdk_nvmf_cmd *cmd = &rqpair->cmds[rdma_req->id];
    1554           7 :         struct nvme_rdma_memory_translation_ctx ctx;
    1555             :         uint32_t remaining_size;
    1556           7 :         uint32_t sge_length;
    1557             :         int rc, max_num_sgl, num_sgl_desc;
    1558             : 
    1559           7 :         assert(req->payload_size != 0);
    1560           7 :         assert(nvme_payload_type(&req->payload) == NVME_PAYLOAD_TYPE_SGL);
    1561           7 :         assert(req->payload.reset_sgl_fn != NULL);
    1562           7 :         assert(req->payload.next_sge_fn != NULL);
    1563           7 :         req->payload.reset_sgl_fn(req->payload.contig_or_cb_arg, req->payload_offset);
    1564             : 
    1565           7 :         max_num_sgl = req->qpair->ctrlr->max_sges;
    1566             : 
    1567           7 :         remaining_size = req->payload_size;
    1568           7 :         num_sgl_desc = 0;
    1569             :         do {
    1570          18 :                 rc = req->payload.next_sge_fn(req->payload.contig_or_cb_arg, &ctx.addr, &sge_length);
    1571          18 :                 if (rc) {
    1572           1 :                         return -1;
    1573             :                 }
    1574             : 
    1575          17 :                 sge_length = spdk_min(remaining_size, sge_length);
    1576             : 
    1577          17 :                 if (spdk_unlikely(sge_length > NVME_RDMA_MAX_KEYED_SGL_LENGTH)) {
    1578           1 :                         SPDK_ERRLOG("SGL length %u exceeds max keyed SGL block size %u\n",
    1579             :                                     sge_length, NVME_RDMA_MAX_KEYED_SGL_LENGTH);
    1580           1 :                         return -1;
    1581             :                 }
    1582          16 :                 ctx.length = sge_length;
    1583          16 :                 rc = nvme_rdma_get_memory_translation(req, rqpair, &ctx);
    1584          16 :                 if (spdk_unlikely(rc)) {
    1585           1 :                         return -1;
    1586             :                 }
    1587             : 
    1588          15 :                 cmd->sgl[num_sgl_desc].keyed.key = ctx.rkey;
    1589          15 :                 cmd->sgl[num_sgl_desc].keyed.type = SPDK_NVME_SGL_TYPE_KEYED_DATA_BLOCK;
    1590          15 :                 cmd->sgl[num_sgl_desc].keyed.subtype = SPDK_NVME_SGL_SUBTYPE_ADDRESS;
    1591          15 :                 cmd->sgl[num_sgl_desc].keyed.length = (uint32_t)ctx.length;
    1592          15 :                 cmd->sgl[num_sgl_desc].address = (uint64_t)ctx.addr;
    1593             : 
    1594          15 :                 remaining_size -= ctx.length;
    1595          15 :                 num_sgl_desc++;
    1596          15 :         } while (remaining_size > 0 && num_sgl_desc < max_num_sgl);
    1597             : 
    1598             : 
    1599             :         /* Should be impossible if we did our sgl checks properly up the stack, but do a sanity check here. */
    1600           4 :         if (remaining_size > 0) {
    1601           0 :                 return -1;
    1602             :         }
    1603             : 
    1604           4 :         req->cmd.psdt = SPDK_NVME_PSDT_SGL_MPTR_CONTIG;
    1605             : 
    1606             :         /* The RDMA SGL needs one element describing some portion
    1607             :          * of the spdk_nvmf_cmd structure. */
    1608           4 :         rdma_req->send_wr.num_sge = 1;
    1609             : 
    1610             :         /*
    1611             :          * If only one SGL descriptor is required, it can be embedded directly in the command
    1612             :          * as a data block descriptor.
    1613             :          */
    1614           4 :         if (num_sgl_desc == 1) {
    1615             :                 /* The first element of this SGL is pointing at an
    1616             :                  * spdk_nvmf_cmd object. For this particular command,
    1617             :                  * we only need the first 64 bytes corresponding to
    1618             :                  * the NVMe command. */
    1619           2 :                 rdma_req->send_sgl[0].length = sizeof(struct spdk_nvme_cmd);
    1620             : 
    1621           2 :                 req->cmd.dptr.sgl1.keyed.type = cmd->sgl[0].keyed.type;
    1622           2 :                 req->cmd.dptr.sgl1.keyed.subtype = cmd->sgl[0].keyed.subtype;
    1623           2 :                 req->cmd.dptr.sgl1.keyed.length = cmd->sgl[0].keyed.length;
    1624           2 :                 req->cmd.dptr.sgl1.keyed.key = cmd->sgl[0].keyed.key;
    1625           2 :                 req->cmd.dptr.sgl1.address = cmd->sgl[0].address;
    1626             :         } else {
    1627             :                 /*
    1628             :                  * Otherwise, The SGL descriptor embedded in the command must point to the list of
    1629             :                  * SGL descriptors used to describe the operation. In that case it is a last segment descriptor.
    1630             :                  */
    1631           2 :                 uint32_t descriptors_size = sizeof(struct spdk_nvme_sgl_descriptor) * num_sgl_desc;
    1632             : 
    1633           2 :                 if (spdk_unlikely(descriptors_size > rqpair->qpair.ctrlr->ioccsz_bytes)) {
    1634           1 :                         SPDK_ERRLOG("Size of SGL descriptors (%u) exceeds ICD (%u)\n",
    1635             :                                     descriptors_size, rqpair->qpair.ctrlr->ioccsz_bytes);
    1636           1 :                         return -1;
    1637             :                 }
    1638           1 :                 rdma_req->send_sgl[0].length = sizeof(struct spdk_nvme_cmd) + descriptors_size;
    1639             : 
    1640           1 :                 req->cmd.dptr.sgl1.unkeyed.type = SPDK_NVME_SGL_TYPE_LAST_SEGMENT;
    1641           1 :                 req->cmd.dptr.sgl1.unkeyed.subtype = SPDK_NVME_SGL_SUBTYPE_OFFSET;
    1642           1 :                 req->cmd.dptr.sgl1.unkeyed.length = descriptors_size;
    1643           1 :                 req->cmd.dptr.sgl1.address = (uint64_t)0;
    1644             :         }
    1645             : 
    1646           3 :         return 0;
    1647             : }
    1648             : 
    1649             : /*
    1650             :  * Build inline SGL describing sgl payload buffer.
    1651             :  */
    1652             : static int
    1653           3 : nvme_rdma_build_sgl_inline_request(struct nvme_rdma_qpair *rqpair,
    1654             :                                    struct spdk_nvme_rdma_req *rdma_req)
    1655             : {
    1656           3 :         struct nvme_request *req = rdma_req->req;
    1657           3 :         struct nvme_rdma_memory_translation_ctx ctx;
    1658           3 :         uint32_t length;
    1659             :         int rc;
    1660             : 
    1661           3 :         assert(req->payload_size != 0);
    1662           3 :         assert(nvme_payload_type(&req->payload) == NVME_PAYLOAD_TYPE_SGL);
    1663           3 :         assert(req->payload.reset_sgl_fn != NULL);
    1664           3 :         assert(req->payload.next_sge_fn != NULL);
    1665           3 :         req->payload.reset_sgl_fn(req->payload.contig_or_cb_arg, req->payload_offset);
    1666             : 
    1667           3 :         rc = req->payload.next_sge_fn(req->payload.contig_or_cb_arg, &ctx.addr, &length);
    1668           3 :         if (rc) {
    1669           0 :                 return -1;
    1670             :         }
    1671             : 
    1672           3 :         if (length < req->payload_size) {
    1673           0 :                 SPDK_DEBUGLOG(nvme, "Inline SGL request split so sending separately.\n");
    1674           0 :                 return nvme_rdma_build_sgl_request(rqpair, rdma_req);
    1675             :         }
    1676             : 
    1677           3 :         if (length > req->payload_size) {
    1678           0 :                 length = req->payload_size;
    1679             :         }
    1680             : 
    1681           3 :         ctx.length = length;
    1682           3 :         rc = nvme_rdma_get_memory_translation(req, rqpair, &ctx);
    1683           3 :         if (spdk_unlikely(rc)) {
    1684           0 :                 return -1;
    1685             :         }
    1686             : 
    1687           3 :         rdma_req->send_sgl[1].addr = (uint64_t)ctx.addr;
    1688           3 :         rdma_req->send_sgl[1].length = (uint32_t)ctx.length;
    1689           3 :         rdma_req->send_sgl[1].lkey = ctx.lkey;
    1690             : 
    1691           3 :         rdma_req->send_wr.num_sge = 2;
    1692             : 
    1693             :         /* The first element of this SGL is pointing at an
    1694             :          * spdk_nvmf_cmd object. For this particular command,
    1695             :          * we only need the first 64 bytes corresponding to
    1696             :          * the NVMe command. */
    1697           3 :         rdma_req->send_sgl[0].length = sizeof(struct spdk_nvme_cmd);
    1698             : 
    1699           3 :         req->cmd.psdt = SPDK_NVME_PSDT_SGL_MPTR_CONTIG;
    1700           3 :         req->cmd.dptr.sgl1.unkeyed.type = SPDK_NVME_SGL_TYPE_DATA_BLOCK;
    1701           3 :         req->cmd.dptr.sgl1.unkeyed.subtype = SPDK_NVME_SGL_SUBTYPE_OFFSET;
    1702           3 :         req->cmd.dptr.sgl1.unkeyed.length = (uint32_t)ctx.length;
    1703             :         /* Inline only supported for icdoff == 0 currently.  This function will
    1704             :          * not get called for controllers with other values. */
    1705           3 :         req->cmd.dptr.sgl1.address = (uint64_t)0;
    1706             : 
    1707           3 :         return 0;
    1708             : }
    1709             : 
    1710             : static int
    1711           6 : nvme_rdma_req_init(struct nvme_rdma_qpair *rqpair, struct nvme_request *req,
    1712             :                    struct spdk_nvme_rdma_req *rdma_req)
    1713             : {
    1714           6 :         struct spdk_nvme_ctrlr *ctrlr = rqpair->qpair.ctrlr;
    1715             :         enum nvme_payload_type payload_type;
    1716             :         bool icd_supported;
    1717             :         int rc;
    1718             : 
    1719           6 :         assert(rdma_req->req == NULL);
    1720           6 :         rdma_req->req = req;
    1721           6 :         req->cmd.cid = rdma_req->id;
    1722           6 :         payload_type = nvme_payload_type(&req->payload);
    1723             :         /*
    1724             :          * Check if icdoff is non zero, to avoid interop conflicts with
    1725             :          * targets with non-zero icdoff.  Both SPDK and the Linux kernel
    1726             :          * targets use icdoff = 0.  For targets with non-zero icdoff, we
    1727             :          * will currently just not use inline data for now.
    1728             :          */
    1729           6 :         icd_supported = spdk_nvme_opc_get_data_transfer(req->cmd.opc) == SPDK_NVME_DATA_HOST_TO_CONTROLLER
    1730           6 :                         && req->payload_size <= ctrlr->ioccsz_bytes && ctrlr->icdoff == 0;
    1731             : 
    1732           6 :         if (req->payload_size == 0) {
    1733           2 :                 rc = nvme_rdma_build_null_request(rdma_req);
    1734           4 :         } else if (payload_type == NVME_PAYLOAD_TYPE_CONTIG) {
    1735           2 :                 if (icd_supported) {
    1736           1 :                         rc = nvme_rdma_build_contig_inline_request(rqpair, rdma_req);
    1737             :                 } else {
    1738           1 :                         rc = nvme_rdma_build_contig_request(rqpair, rdma_req);
    1739             :                 }
    1740           2 :         } else if (payload_type == NVME_PAYLOAD_TYPE_SGL) {
    1741           2 :                 if (icd_supported) {
    1742           1 :                         rc = nvme_rdma_build_sgl_inline_request(rqpair, rdma_req);
    1743             :                 } else {
    1744           1 :                         rc = nvme_rdma_build_sgl_request(rqpair, rdma_req);
    1745             :                 }
    1746             :         } else {
    1747           0 :                 rc = -1;
    1748             :         }
    1749             : 
    1750           6 :         if (rc) {
    1751           0 :                 rdma_req->req = NULL;
    1752           0 :                 return rc;
    1753             :         }
    1754             : 
    1755           6 :         memcpy(&rqpair->cmds[rdma_req->id], &req->cmd, sizeof(req->cmd));
    1756           6 :         return 0;
    1757             : }
    1758             : 
    1759             : static struct spdk_nvme_qpair *
    1760           5 : nvme_rdma_ctrlr_create_qpair(struct spdk_nvme_ctrlr *ctrlr,
    1761             :                              uint16_t qid, uint32_t qsize,
    1762             :                              enum spdk_nvme_qprio qprio,
    1763             :                              uint32_t num_requests,
    1764             :                              bool delay_cmd_submit,
    1765             :                              bool async)
    1766             : {
    1767             :         struct nvme_rdma_qpair *rqpair;
    1768             :         struct spdk_nvme_qpair *qpair;
    1769             :         int rc;
    1770             : 
    1771           5 :         if (qsize < SPDK_NVME_QUEUE_MIN_ENTRIES) {
    1772           2 :                 SPDK_ERRLOG("Failed to create qpair with size %u. Minimum queue size is %d.\n",
    1773             :                             qsize, SPDK_NVME_QUEUE_MIN_ENTRIES);
    1774           2 :                 return NULL;
    1775             :         }
    1776             : 
    1777           3 :         rqpair = spdk_zmalloc(sizeof(struct nvme_rdma_qpair), 0, NULL, SPDK_ENV_SOCKET_ID_ANY,
    1778             :                               SPDK_MALLOC_DMA);
    1779           3 :         if (!rqpair) {
    1780           0 :                 SPDK_ERRLOG("failed to get create rqpair\n");
    1781           0 :                 return NULL;
    1782             :         }
    1783             : 
    1784             :         /* Set num_entries one less than queue size. According to NVMe
    1785             :          * and NVMe-oF specs we can not submit queue size requests,
    1786             :          * one slot shall always remain empty.
    1787             :          */
    1788           3 :         rqpair->num_entries = qsize - 1;
    1789           3 :         rqpair->delay_cmd_submit = delay_cmd_submit;
    1790           3 :         rqpair->state = NVME_RDMA_QPAIR_STATE_INVALID;
    1791           3 :         qpair = &rqpair->qpair;
    1792           3 :         rc = nvme_qpair_init(qpair, qid, ctrlr, qprio, num_requests, async);
    1793           3 :         if (rc != 0) {
    1794           0 :                 spdk_free(rqpair);
    1795           0 :                 return NULL;
    1796             :         }
    1797             : 
    1798           3 :         return qpair;
    1799             : }
    1800             : 
    1801             : static void
    1802           1 : nvme_rdma_qpair_destroy(struct nvme_rdma_qpair *rqpair)
    1803             : {
    1804           1 :         struct spdk_nvme_qpair *qpair = &rqpair->qpair;
    1805             :         struct nvme_rdma_ctrlr *rctrlr;
    1806             :         struct nvme_rdma_cm_event_entry *entry, *tmp;
    1807             : 
    1808           1 :         spdk_rdma_utils_free_mem_map(&rqpair->mr_map);
    1809             : 
    1810           1 :         if (rqpair->evt) {
    1811           0 :                 rdma_ack_cm_event(rqpair->evt);
    1812           0 :                 rqpair->evt = NULL;
    1813             :         }
    1814             : 
    1815             :         /*
    1816             :          * This works because we have the controller lock both in
    1817             :          * this function and in the function where we add new events.
    1818             :          */
    1819           1 :         if (qpair->ctrlr != NULL) {
    1820           1 :                 rctrlr = nvme_rdma_ctrlr(qpair->ctrlr);
    1821           1 :                 STAILQ_FOREACH_SAFE(entry, &rctrlr->pending_cm_events, link, tmp) {
    1822           0 :                         if (entry->evt->id->context == rqpair) {
    1823           0 :                                 STAILQ_REMOVE(&rctrlr->pending_cm_events, entry, nvme_rdma_cm_event_entry, link);
    1824           0 :                                 rdma_ack_cm_event(entry->evt);
    1825           0 :                                 STAILQ_INSERT_HEAD(&rctrlr->free_cm_events, entry, link);
    1826             :                         }
    1827             :                 }
    1828             :         }
    1829             : 
    1830           1 :         if (rqpair->cm_id) {
    1831           0 :                 if (rqpair->rdma_qp) {
    1832           0 :                         spdk_rdma_utils_put_pd(rqpair->rdma_qp->qp->pd);
    1833           0 :                         spdk_rdma_provider_qp_destroy(rqpair->rdma_qp);
    1834           0 :                         rqpair->rdma_qp = NULL;
    1835             :                 }
    1836             :         }
    1837             : 
    1838           1 :         if (rqpair->poller) {
    1839             :                 struct nvme_rdma_poll_group     *group;
    1840             : 
    1841           0 :                 assert(qpair->poll_group);
    1842           0 :                 group = nvme_rdma_poll_group(qpair->poll_group);
    1843             : 
    1844           0 :                 nvme_rdma_poll_group_put_poller(group, rqpair->poller);
    1845             : 
    1846           0 :                 rqpair->poller = NULL;
    1847           0 :                 rqpair->cq = NULL;
    1848           0 :                 if (rqpair->srq) {
    1849           0 :                         rqpair->srq = NULL;
    1850           0 :                         rqpair->rsps = NULL;
    1851             :                 }
    1852           1 :         } else if (rqpair->cq) {
    1853           0 :                 ibv_destroy_cq(rqpair->cq);
    1854           0 :                 rqpair->cq = NULL;
    1855             :         }
    1856             : 
    1857           1 :         nvme_rdma_free_reqs(rqpair);
    1858           1 :         nvme_rdma_free_rsps(rqpair->rsps);
    1859           1 :         rqpair->rsps = NULL;
    1860             : 
    1861             :         /* destroy cm_id last so cma device will not be freed before we destroy the cq. */
    1862           1 :         if (rqpair->cm_id) {
    1863           0 :                 rdma_destroy_id(rqpair->cm_id);
    1864           0 :                 rqpair->cm_id = NULL;
    1865             :         }
    1866           1 : }
    1867             : 
    1868             : static void nvme_rdma_qpair_abort_reqs(struct spdk_nvme_qpair *qpair, uint32_t dnr);
    1869             : 
    1870             : static int
    1871           1 : nvme_rdma_qpair_disconnected(struct nvme_rdma_qpair *rqpair, int ret)
    1872             : {
    1873           1 :         if (ret) {
    1874           0 :                 SPDK_DEBUGLOG(nvme, "Target did not respond to qpair disconnect.\n");
    1875           0 :                 goto quiet;
    1876             :         }
    1877             : 
    1878           1 :         if (rqpair->poller == NULL) {
    1879             :                 /* If poller is not used, cq is not shared.
    1880             :                  * So complete disconnecting qpair immediately.
    1881             :                  */
    1882           1 :                 goto quiet;
    1883             :         }
    1884             : 
    1885           0 :         if (rqpair->rsps == NULL) {
    1886           0 :                 goto quiet;
    1887             :         }
    1888             : 
    1889           0 :         if (rqpair->need_destroy ||
    1890           0 :             (rqpair->current_num_sends != 0 ||
    1891           0 :              (!rqpair->srq && rqpair->rsps->current_num_recvs != 0))) {
    1892           0 :                 rqpair->state = NVME_RDMA_QPAIR_STATE_LINGERING;
    1893           0 :                 rqpair->evt_timeout_ticks = (NVME_RDMA_DISCONNECTED_QPAIR_TIMEOUT_US * spdk_get_ticks_hz()) /
    1894           0 :                                             SPDK_SEC_TO_USEC + spdk_get_ticks();
    1895             : 
    1896           0 :                 return -EAGAIN;
    1897             :         }
    1898             : 
    1899           0 : quiet:
    1900           1 :         rqpair->state = NVME_RDMA_QPAIR_STATE_EXITED;
    1901             : 
    1902           1 :         nvme_rdma_qpair_abort_reqs(&rqpair->qpair, 0);
    1903           1 :         nvme_rdma_qpair_destroy(rqpair);
    1904           1 :         nvme_transport_ctrlr_disconnect_qpair_done(&rqpair->qpair);
    1905             : 
    1906           1 :         return 0;
    1907             : }
    1908             : 
    1909             : static int
    1910           0 : nvme_rdma_qpair_wait_until_quiet(struct nvme_rdma_qpair *rqpair)
    1911             : {
    1912           0 :         struct spdk_nvme_qpair *qpair = &rqpair->qpair;
    1913           0 :         struct spdk_nvme_ctrlr *ctrlr = qpair->ctrlr;
    1914             : 
    1915           0 :         if (spdk_get_ticks() < rqpair->evt_timeout_ticks &&
    1916           0 :             (rqpair->current_num_sends != 0 ||
    1917           0 :              (!rqpair->srq && rqpair->rsps->current_num_recvs != 0))) {
    1918           0 :                 return -EAGAIN;
    1919             :         }
    1920             : 
    1921           0 :         rqpair->state = NVME_RDMA_QPAIR_STATE_EXITED;
    1922           0 :         nvme_rdma_qpair_abort_reqs(&rqpair->qpair, 0);
    1923           0 :         if (!nvme_qpair_is_admin_queue(qpair)) {
    1924           0 :                 nvme_robust_mutex_lock(&ctrlr->ctrlr_lock);
    1925             :         }
    1926           0 :         nvme_rdma_qpair_destroy(rqpair);
    1927           0 :         if (!nvme_qpair_is_admin_queue(qpair)) {
    1928           0 :                 nvme_robust_mutex_unlock(&ctrlr->ctrlr_lock);
    1929             :         }
    1930           0 :         nvme_transport_ctrlr_disconnect_qpair_done(&rqpair->qpair);
    1931             : 
    1932           0 :         return 0;
    1933             : }
    1934             : 
    1935             : static void
    1936           0 : _nvme_rdma_ctrlr_disconnect_qpair(struct spdk_nvme_ctrlr *ctrlr, struct spdk_nvme_qpair *qpair,
    1937             :                                   nvme_rdma_cm_event_cb disconnected_qpair_cb)
    1938             : {
    1939           0 :         struct nvme_rdma_qpair *rqpair = nvme_rdma_qpair(qpair);
    1940             :         int rc;
    1941             : 
    1942           0 :         assert(disconnected_qpair_cb != NULL);
    1943             : 
    1944           0 :         rqpair->state = NVME_RDMA_QPAIR_STATE_EXITING;
    1945             : 
    1946           0 :         if (rqpair->cm_id) {
    1947           0 :                 if (rqpair->rdma_qp) {
    1948           0 :                         rc = spdk_rdma_provider_qp_disconnect(rqpair->rdma_qp);
    1949           0 :                         if ((qpair->ctrlr != NULL) && (rc == 0)) {
    1950           0 :                                 rc = nvme_rdma_process_event_start(rqpair, RDMA_CM_EVENT_DISCONNECTED,
    1951             :                                                                    disconnected_qpair_cb);
    1952           0 :                                 if (rc == 0) {
    1953           0 :                                         return;
    1954             :                                 }
    1955             :                         }
    1956             :                 }
    1957             :         }
    1958             : 
    1959           0 :         disconnected_qpair_cb(rqpair, 0);
    1960             : }
    1961             : 
    1962             : static int
    1963           0 : nvme_rdma_ctrlr_disconnect_qpair_poll(struct spdk_nvme_ctrlr *ctrlr, struct spdk_nvme_qpair *qpair)
    1964             : {
    1965           0 :         struct nvme_rdma_qpair *rqpair = nvme_rdma_qpair(qpair);
    1966             :         int rc;
    1967             : 
    1968           0 :         switch (rqpair->state) {
    1969           0 :         case NVME_RDMA_QPAIR_STATE_EXITING:
    1970           0 :                 if (!nvme_qpair_is_admin_queue(qpair)) {
    1971           0 :                         nvme_ctrlr_lock(ctrlr);
    1972             :                 }
    1973             : 
    1974           0 :                 rc = nvme_rdma_process_event_poll(rqpair);
    1975             : 
    1976           0 :                 if (!nvme_qpair_is_admin_queue(qpair)) {
    1977           0 :                         nvme_ctrlr_unlock(ctrlr);
    1978             :                 }
    1979           0 :                 break;
    1980             : 
    1981           0 :         case NVME_RDMA_QPAIR_STATE_LINGERING:
    1982           0 :                 rc = nvme_rdma_qpair_wait_until_quiet(rqpair);
    1983           0 :                 break;
    1984           0 :         case NVME_RDMA_QPAIR_STATE_EXITED:
    1985           0 :                 rc = 0;
    1986           0 :                 break;
    1987             : 
    1988           0 :         default:
    1989           0 :                 assert(false);
    1990             :                 rc = -EAGAIN;
    1991             :                 break;
    1992             :         }
    1993             : 
    1994           0 :         return rc;
    1995             : }
    1996             : 
    1997             : static void
    1998           0 : nvme_rdma_ctrlr_disconnect_qpair(struct spdk_nvme_ctrlr *ctrlr, struct spdk_nvme_qpair *qpair)
    1999             : {
    2000             :         int rc;
    2001             : 
    2002           0 :         _nvme_rdma_ctrlr_disconnect_qpair(ctrlr, qpair, nvme_rdma_qpair_disconnected);
    2003             : 
    2004             :         /* If the async mode is disabled, poll the qpair until it is actually disconnected.
    2005             :          * It is ensured that poll_group_process_completions() calls disconnected_qpair_cb
    2006             :          * for any disconnected qpair. Hence, we do not have to check if the qpair is in
    2007             :          * a poll group or not.
    2008             :          * At the same time, if the qpair is being destroyed, i.e. this function is called by
    2009             :          * spdk_nvme_ctrlr_free_io_qpair then we need to wait until qpair is disconnected, otherwise
    2010             :          * we may leak some resources.
    2011             :          */
    2012           0 :         if (qpair->async && !qpair->destroy_in_progress) {
    2013           0 :                 return;
    2014             :         }
    2015             : 
    2016             :         while (1) {
    2017           0 :                 rc = nvme_rdma_ctrlr_disconnect_qpair_poll(ctrlr, qpair);
    2018           0 :                 if (rc != -EAGAIN) {
    2019           0 :                         break;
    2020             :                 }
    2021             :         }
    2022             : }
    2023             : 
    2024             : static int
    2025           0 : nvme_rdma_stale_conn_disconnected(struct nvme_rdma_qpair *rqpair, int ret)
    2026             : {
    2027           0 :         struct spdk_nvme_qpair *qpair = &rqpair->qpair;
    2028             : 
    2029           0 :         if (ret) {
    2030           0 :                 SPDK_DEBUGLOG(nvme, "Target did not respond to qpair disconnect.\n");
    2031             :         }
    2032             : 
    2033           0 :         nvme_rdma_qpair_destroy(rqpair);
    2034             : 
    2035           0 :         qpair->last_transport_failure_reason = qpair->transport_failure_reason;
    2036           0 :         qpair->transport_failure_reason = SPDK_NVME_QPAIR_FAILURE_NONE;
    2037             : 
    2038           0 :         rqpair->state = NVME_RDMA_QPAIR_STATE_STALE_CONN;
    2039           0 :         rqpair->evt_timeout_ticks = (NVME_RDMA_STALE_CONN_RETRY_DELAY_US * spdk_get_ticks_hz()) /
    2040           0 :                                     SPDK_SEC_TO_USEC + spdk_get_ticks();
    2041             : 
    2042           0 :         return 0;
    2043             : }
    2044             : 
    2045             : static int
    2046           0 : nvme_rdma_stale_conn_retry(struct nvme_rdma_qpair *rqpair)
    2047             : {
    2048           0 :         struct spdk_nvme_qpair *qpair = &rqpair->qpair;
    2049             : 
    2050           0 :         if (rqpair->stale_conn_retry_count >= NVME_RDMA_STALE_CONN_RETRY_MAX) {
    2051           0 :                 SPDK_ERRLOG("Retry failed %d times, give up stale connection to qpair (cntlid:%u, qid:%u).\n",
    2052             :                             NVME_RDMA_STALE_CONN_RETRY_MAX, qpair->ctrlr->cntlid, qpair->id);
    2053           0 :                 return -ESTALE;
    2054             :         }
    2055             : 
    2056           0 :         rqpair->stale_conn_retry_count++;
    2057             : 
    2058           0 :         SPDK_NOTICELOG("%d times, retry stale connection to qpair (cntlid:%u, qid:%u).\n",
    2059             :                        rqpair->stale_conn_retry_count, qpair->ctrlr->cntlid, qpair->id);
    2060             : 
    2061           0 :         _nvme_rdma_ctrlr_disconnect_qpair(qpair->ctrlr, qpair, nvme_rdma_stale_conn_disconnected);
    2062             : 
    2063           0 :         return 0;
    2064             : }
    2065             : 
    2066             : static int
    2067           1 : nvme_rdma_ctrlr_delete_io_qpair(struct spdk_nvme_ctrlr *ctrlr, struct spdk_nvme_qpair *qpair)
    2068             : {
    2069             :         struct nvme_rdma_qpair *rqpair;
    2070             : 
    2071           1 :         assert(qpair != NULL);
    2072           1 :         rqpair = nvme_rdma_qpair(qpair);
    2073             : 
    2074           1 :         if (rqpair->state != NVME_RDMA_QPAIR_STATE_EXITED) {
    2075             :                 int rc __attribute__((unused));
    2076             : 
    2077             :                 /* qpair was removed from the poll group while the disconnect is not finished.
    2078             :                  * Destroy rdma resources forcefully. */
    2079           1 :                 rc = nvme_rdma_qpair_disconnected(rqpair, 0);
    2080           1 :                 assert(rc == 0);
    2081             :         }
    2082             : 
    2083           1 :         nvme_rdma_qpair_abort_reqs(qpair, 0);
    2084           1 :         nvme_qpair_deinit(qpair);
    2085             : 
    2086           1 :         if (spdk_rdma_utils_put_memory_domain(rqpair->memory_domain) != 0) {
    2087           0 :                 SPDK_ERRLOG("Failed to release memory domain\n");
    2088           0 :                 assert(0);
    2089             :         }
    2090             : 
    2091           1 :         spdk_free(rqpair);
    2092             : 
    2093           1 :         return 0;
    2094             : }
    2095             : 
    2096             : static struct spdk_nvme_qpair *
    2097           0 : nvme_rdma_ctrlr_create_io_qpair(struct spdk_nvme_ctrlr *ctrlr, uint16_t qid,
    2098             :                                 const struct spdk_nvme_io_qpair_opts *opts)
    2099             : {
    2100           0 :         return nvme_rdma_ctrlr_create_qpair(ctrlr, qid, opts->io_queue_size, opts->qprio,
    2101             :                                             opts->io_queue_requests,
    2102           0 :                                             opts->delay_cmd_submit,
    2103           0 :                                             opts->async_mode);
    2104             : }
    2105             : 
    2106             : static int
    2107           0 : nvme_rdma_ctrlr_enable(struct spdk_nvme_ctrlr *ctrlr)
    2108             : {
    2109             :         /* do nothing here */
    2110           0 :         return 0;
    2111             : }
    2112             : 
    2113             : static int nvme_rdma_ctrlr_destruct(struct spdk_nvme_ctrlr *ctrlr);
    2114             : 
    2115             : /* We have to use the typedef in the function declaration to appease astyle. */
    2116             : typedef struct spdk_nvme_ctrlr spdk_nvme_ctrlr_t;
    2117             : 
    2118             : static spdk_nvme_ctrlr_t *
    2119           1 : nvme_rdma_ctrlr_construct(const struct spdk_nvme_transport_id *trid,
    2120             :                           const struct spdk_nvme_ctrlr_opts *opts,
    2121             :                           void *devhandle)
    2122             : {
    2123             :         struct nvme_rdma_ctrlr *rctrlr;
    2124             :         struct ibv_context **contexts;
    2125           1 :         struct ibv_device_attr dev_attr;
    2126             :         int i, flag, rc;
    2127             : 
    2128           1 :         rctrlr = spdk_zmalloc(sizeof(struct nvme_rdma_ctrlr), 0, NULL, SPDK_ENV_SOCKET_ID_ANY,
    2129             :                               SPDK_MALLOC_DMA);
    2130           1 :         if (rctrlr == NULL) {
    2131           0 :                 SPDK_ERRLOG("could not allocate ctrlr\n");
    2132           0 :                 return NULL;
    2133             :         }
    2134             : 
    2135           1 :         rctrlr->ctrlr.opts = *opts;
    2136           1 :         rctrlr->ctrlr.trid = *trid;
    2137             : 
    2138           1 :         if (opts->transport_retry_count > NVME_RDMA_CTRLR_MAX_TRANSPORT_RETRY_COUNT) {
    2139           1 :                 SPDK_NOTICELOG("transport_retry_count exceeds max value %d, use max value\n",
    2140             :                                NVME_RDMA_CTRLR_MAX_TRANSPORT_RETRY_COUNT);
    2141           1 :                 rctrlr->ctrlr.opts.transport_retry_count = NVME_RDMA_CTRLR_MAX_TRANSPORT_RETRY_COUNT;
    2142             :         }
    2143             : 
    2144           1 :         if (opts->transport_ack_timeout > NVME_RDMA_CTRLR_MAX_TRANSPORT_ACK_TIMEOUT) {
    2145           1 :                 SPDK_NOTICELOG("transport_ack_timeout exceeds max value %d, use max value\n",
    2146             :                                NVME_RDMA_CTRLR_MAX_TRANSPORT_ACK_TIMEOUT);
    2147           1 :                 rctrlr->ctrlr.opts.transport_ack_timeout = NVME_RDMA_CTRLR_MAX_TRANSPORT_ACK_TIMEOUT;
    2148             :         }
    2149             : 
    2150           1 :         contexts = rdma_get_devices(NULL);
    2151           1 :         if (contexts == NULL) {
    2152           0 :                 SPDK_ERRLOG("rdma_get_devices() failed: %s (%d)\n", spdk_strerror(errno), errno);
    2153           0 :                 spdk_free(rctrlr);
    2154           0 :                 return NULL;
    2155             :         }
    2156             : 
    2157           1 :         i = 0;
    2158           1 :         rctrlr->max_sge = NVME_RDMA_MAX_SGL_DESCRIPTORS;
    2159             : 
    2160           3 :         while (contexts[i] != NULL) {
    2161           2 :                 rc = ibv_query_device(contexts[i], &dev_attr);
    2162           2 :                 if (rc < 0) {
    2163           0 :                         SPDK_ERRLOG("Failed to query RDMA device attributes.\n");
    2164           0 :                         rdma_free_devices(contexts);
    2165           0 :                         spdk_free(rctrlr);
    2166           0 :                         return NULL;
    2167             :                 }
    2168           2 :                 rctrlr->max_sge = spdk_min(rctrlr->max_sge, (uint16_t)dev_attr.max_sge);
    2169           2 :                 i++;
    2170             :         }
    2171             : 
    2172           1 :         rdma_free_devices(contexts);
    2173             : 
    2174           1 :         rc = nvme_ctrlr_construct(&rctrlr->ctrlr);
    2175           1 :         if (rc != 0) {
    2176           0 :                 spdk_free(rctrlr);
    2177           0 :                 return NULL;
    2178             :         }
    2179             : 
    2180           1 :         STAILQ_INIT(&rctrlr->pending_cm_events);
    2181           1 :         STAILQ_INIT(&rctrlr->free_cm_events);
    2182           1 :         rctrlr->cm_events = spdk_zmalloc(NVME_RDMA_NUM_CM_EVENTS * sizeof(*rctrlr->cm_events), 0, NULL,
    2183             :                                          SPDK_ENV_SOCKET_ID_ANY, SPDK_MALLOC_DMA);
    2184           1 :         if (rctrlr->cm_events == NULL) {
    2185           0 :                 SPDK_ERRLOG("unable to allocate buffers to hold CM events.\n");
    2186           0 :                 goto destruct_ctrlr;
    2187             :         }
    2188             : 
    2189         257 :         for (i = 0; i < NVME_RDMA_NUM_CM_EVENTS; i++) {
    2190         256 :                 STAILQ_INSERT_TAIL(&rctrlr->free_cm_events, &rctrlr->cm_events[i], link);
    2191             :         }
    2192             : 
    2193           1 :         rctrlr->cm_channel = rdma_create_event_channel();
    2194           1 :         if (rctrlr->cm_channel == NULL) {
    2195           0 :                 SPDK_ERRLOG("rdma_create_event_channel() failed\n");
    2196           0 :                 goto destruct_ctrlr;
    2197             :         }
    2198             : 
    2199           1 :         flag = fcntl(rctrlr->cm_channel->fd, F_GETFL);
    2200           1 :         if (fcntl(rctrlr->cm_channel->fd, F_SETFL, flag | O_NONBLOCK) < 0) {
    2201           0 :                 SPDK_ERRLOG("Cannot set event channel to non blocking\n");
    2202           0 :                 goto destruct_ctrlr;
    2203             :         }
    2204             : 
    2205           2 :         rctrlr->ctrlr.adminq = nvme_rdma_ctrlr_create_qpair(&rctrlr->ctrlr, 0,
    2206           1 :                                rctrlr->ctrlr.opts.admin_queue_size, 0,
    2207           1 :                                rctrlr->ctrlr.opts.admin_queue_size, false, true);
    2208           1 :         if (!rctrlr->ctrlr.adminq) {
    2209           0 :                 SPDK_ERRLOG("failed to create admin qpair\n");
    2210           0 :                 goto destruct_ctrlr;
    2211             :         }
    2212             : 
    2213           1 :         if (nvme_ctrlr_add_process(&rctrlr->ctrlr, 0) != 0) {
    2214           0 :                 SPDK_ERRLOG("nvme_ctrlr_add_process() failed\n");
    2215           0 :                 goto destruct_ctrlr;
    2216             :         }
    2217             : 
    2218           1 :         SPDK_DEBUGLOG(nvme, "successfully initialized the nvmf ctrlr\n");
    2219           1 :         return &rctrlr->ctrlr;
    2220             : 
    2221           0 : destruct_ctrlr:
    2222           0 :         nvme_ctrlr_destruct(&rctrlr->ctrlr);
    2223           0 :         return NULL;
    2224             : }
    2225             : 
    2226             : static int
    2227           1 : nvme_rdma_ctrlr_destruct(struct spdk_nvme_ctrlr *ctrlr)
    2228             : {
    2229           1 :         struct nvme_rdma_ctrlr *rctrlr = nvme_rdma_ctrlr(ctrlr);
    2230             :         struct nvme_rdma_cm_event_entry *entry;
    2231             : 
    2232           1 :         if (ctrlr->adminq) {
    2233           1 :                 nvme_rdma_ctrlr_delete_io_qpair(ctrlr, ctrlr->adminq);
    2234             :         }
    2235             : 
    2236           1 :         STAILQ_FOREACH(entry, &rctrlr->pending_cm_events, link) {
    2237           0 :                 rdma_ack_cm_event(entry->evt);
    2238             :         }
    2239             : 
    2240           1 :         STAILQ_INIT(&rctrlr->free_cm_events);
    2241           1 :         STAILQ_INIT(&rctrlr->pending_cm_events);
    2242           1 :         spdk_free(rctrlr->cm_events);
    2243             : 
    2244           1 :         if (rctrlr->cm_channel) {
    2245           1 :                 rdma_destroy_event_channel(rctrlr->cm_channel);
    2246           1 :                 rctrlr->cm_channel = NULL;
    2247             :         }
    2248             : 
    2249           1 :         nvme_ctrlr_destruct_finish(ctrlr);
    2250             : 
    2251           1 :         spdk_free(rctrlr);
    2252             : 
    2253           1 :         return 0;
    2254             : }
    2255             : 
    2256             : static int
    2257           2 : nvme_rdma_qpair_submit_request(struct spdk_nvme_qpair *qpair,
    2258             :                                struct nvme_request *req)
    2259             : {
    2260             :         struct nvme_rdma_qpair *rqpair;
    2261             :         struct spdk_nvme_rdma_req *rdma_req;
    2262             :         struct ibv_send_wr *wr;
    2263             :         struct nvme_rdma_poll_group *group;
    2264             : 
    2265           2 :         rqpair = nvme_rdma_qpair(qpair);
    2266           2 :         assert(rqpair != NULL);
    2267           2 :         assert(req != NULL);
    2268             : 
    2269           2 :         rdma_req = nvme_rdma_req_get(rqpair);
    2270           2 :         if (spdk_unlikely(!rdma_req)) {
    2271           1 :                 if (rqpair->poller) {
    2272           1 :                         rqpair->poller->stats.queued_requests++;
    2273             :                 }
    2274             :                 /* Inform the upper layer to try again later. */
    2275           1 :                 return -EAGAIN;
    2276             :         }
    2277             : 
    2278           1 :         if (nvme_rdma_req_init(rqpair, req, rdma_req)) {
    2279           0 :                 SPDK_ERRLOG("nvme_rdma_req_init() failed\n");
    2280           0 :                 nvme_rdma_req_put(rqpair, rdma_req);
    2281           0 :                 return -1;
    2282             :         }
    2283             : 
    2284           1 :         TAILQ_INSERT_TAIL(&rqpair->outstanding_reqs, rdma_req, link);
    2285             : 
    2286           1 :         if (!rqpair->link_active.tqe_prev && qpair->poll_group) {
    2287           0 :                 group = nvme_rdma_poll_group(qpair->poll_group);
    2288           0 :                 TAILQ_INSERT_TAIL(&group->active_qpairs, rqpair, link_active);
    2289             :         }
    2290           1 :         rqpair->num_outstanding_reqs++;
    2291             : 
    2292           1 :         assert(rqpair->current_num_sends < rqpair->num_entries);
    2293           1 :         rqpair->current_num_sends++;
    2294             : 
    2295           1 :         wr = &rdma_req->send_wr;
    2296           1 :         wr->next = NULL;
    2297           1 :         nvme_rdma_trace_ibv_sge(wr->sg_list);
    2298             : 
    2299           1 :         spdk_rdma_provider_qp_queue_send_wrs(rqpair->rdma_qp, wr);
    2300             : 
    2301           1 :         if (!rqpair->delay_cmd_submit) {
    2302           1 :                 return nvme_rdma_qpair_submit_sends(rqpair);
    2303             :         }
    2304             : 
    2305           0 :         return 0;
    2306             : }
    2307             : 
    2308             : static int
    2309           0 : nvme_rdma_qpair_reset(struct spdk_nvme_qpair *qpair)
    2310             : {
    2311             :         /* Currently, doing nothing here */
    2312           0 :         return 0;
    2313             : }
    2314             : 
    2315             : static void
    2316           2 : nvme_rdma_qpair_abort_reqs(struct spdk_nvme_qpair *qpair, uint32_t dnr)
    2317             : {
    2318             :         struct spdk_nvme_rdma_req *rdma_req, *tmp;
    2319           2 :         struct spdk_nvme_cpl cpl;
    2320           2 :         struct nvme_rdma_qpair *rqpair = nvme_rdma_qpair(qpair);
    2321             : 
    2322           2 :         cpl.sqid = qpair->id;
    2323           2 :         cpl.status.sc = SPDK_NVME_SC_ABORTED_SQ_DELETION;
    2324           2 :         cpl.status.sct = SPDK_NVME_SCT_GENERIC;
    2325           2 :         cpl.status.dnr = dnr;
    2326             : 
    2327             :         /*
    2328             :          * We cannot abort requests at the RDMA layer without
    2329             :          * unregistering them. If we do, we can still get error
    2330             :          * free completions on the shared completion queue.
    2331             :          */
    2332           2 :         if (nvme_qpair_get_state(qpair) > NVME_QPAIR_DISCONNECTING &&
    2333           0 :             nvme_qpair_get_state(qpair) != NVME_QPAIR_DESTROYING) {
    2334           0 :                 nvme_ctrlr_disconnect_qpair(qpair);
    2335             :         }
    2336             : 
    2337           2 :         TAILQ_FOREACH_SAFE(rdma_req, &rqpair->outstanding_reqs, link, tmp) {
    2338           0 :                 nvme_rdma_req_complete(rdma_req, &cpl, true);
    2339             :         }
    2340           2 : }
    2341             : 
    2342             : static void
    2343           0 : nvme_rdma_qpair_check_timeout(struct spdk_nvme_qpair *qpair)
    2344             : {
    2345             :         uint64_t t02;
    2346             :         struct spdk_nvme_rdma_req *rdma_req, *tmp;
    2347           0 :         struct nvme_rdma_qpair *rqpair = nvme_rdma_qpair(qpair);
    2348           0 :         struct spdk_nvme_ctrlr *ctrlr = qpair->ctrlr;
    2349             :         struct spdk_nvme_ctrlr_process *active_proc;
    2350             : 
    2351             :         /* Don't check timeouts during controller initialization. */
    2352           0 :         if (ctrlr->state != NVME_CTRLR_STATE_READY) {
    2353           0 :                 return;
    2354             :         }
    2355             : 
    2356           0 :         if (nvme_qpair_is_admin_queue(qpair)) {
    2357           0 :                 active_proc = nvme_ctrlr_get_current_process(ctrlr);
    2358             :         } else {
    2359           0 :                 active_proc = qpair->active_proc;
    2360             :         }
    2361             : 
    2362             :         /* Only check timeouts if the current process has a timeout callback. */
    2363           0 :         if (active_proc == NULL || active_proc->timeout_cb_fn == NULL) {
    2364           0 :                 return;
    2365             :         }
    2366             : 
    2367           0 :         t02 = spdk_get_ticks();
    2368           0 :         TAILQ_FOREACH_SAFE(rdma_req, &rqpair->outstanding_reqs, link, tmp) {
    2369           0 :                 assert(rdma_req->req != NULL);
    2370             : 
    2371           0 :                 if (nvme_request_check_timeout(rdma_req->req, rdma_req->id, active_proc, t02)) {
    2372             :                         /*
    2373             :                          * The requests are in order, so as soon as one has not timed out,
    2374             :                          * stop iterating.
    2375             :                          */
    2376           0 :                         break;
    2377             :                 }
    2378             :         }
    2379             : }
    2380             : 
    2381             : static inline void
    2382           0 : nvme_rdma_request_ready(struct nvme_rdma_qpair *rqpair, struct spdk_nvme_rdma_req *rdma_req)
    2383             : {
    2384           0 :         struct spdk_nvme_rdma_rsp *rdma_rsp = rdma_req->rdma_rsp;
    2385           0 :         struct ibv_recv_wr *recv_wr = rdma_rsp->recv_wr;
    2386             : 
    2387           0 :         nvme_rdma_req_complete(rdma_req, &rdma_rsp->cpl, true);
    2388             : 
    2389           0 :         assert(rqpair->rsps->current_num_recvs < rqpair->rsps->num_entries);
    2390           0 :         rqpair->rsps->current_num_recvs++;
    2391             : 
    2392           0 :         recv_wr->next = NULL;
    2393           0 :         nvme_rdma_trace_ibv_sge(recv_wr->sg_list);
    2394             : 
    2395           0 :         if (!rqpair->srq) {
    2396           0 :                 spdk_rdma_provider_qp_queue_recv_wrs(rqpair->rdma_qp, recv_wr);
    2397             :         } else {
    2398           0 :                 spdk_rdma_provider_srq_queue_recv_wrs(rqpair->srq, recv_wr);
    2399             :         }
    2400           0 : }
    2401             : 
    2402             : #define MAX_COMPLETIONS_PER_POLL 128
    2403             : 
    2404             : static void
    2405           0 : nvme_rdma_fail_qpair(struct spdk_nvme_qpair *qpair, int failure_reason)
    2406             : {
    2407           0 :         if (failure_reason == IBV_WC_RETRY_EXC_ERR) {
    2408           0 :                 qpair->transport_failure_reason = SPDK_NVME_QPAIR_FAILURE_REMOTE;
    2409           0 :         } else if (qpair->transport_failure_reason == SPDK_NVME_QPAIR_FAILURE_NONE) {
    2410           0 :                 qpair->transport_failure_reason = SPDK_NVME_QPAIR_FAILURE_UNKNOWN;
    2411             :         }
    2412             : 
    2413           0 :         nvme_ctrlr_disconnect_qpair(qpair);
    2414           0 : }
    2415             : 
    2416             : static struct nvme_rdma_qpair *
    2417           4 : get_rdma_qpair_from_wc(struct nvme_rdma_poll_group *group, struct ibv_wc *wc)
    2418             : {
    2419             :         struct spdk_nvme_qpair *qpair;
    2420             :         struct nvme_rdma_qpair *rqpair;
    2421             : 
    2422           5 :         STAILQ_FOREACH(qpair, &group->group.connected_qpairs, poll_group_stailq) {
    2423           2 :                 rqpair = nvme_rdma_qpair(qpair);
    2424           2 :                 if (NVME_RDMA_POLL_GROUP_CHECK_QPN(rqpair, wc->qp_num)) {
    2425           1 :                         return rqpair;
    2426             :                 }
    2427             :         }
    2428             : 
    2429           4 :         STAILQ_FOREACH(qpair, &group->group.disconnected_qpairs, poll_group_stailq) {
    2430           2 :                 rqpair = nvme_rdma_qpair(qpair);
    2431           2 :                 if (NVME_RDMA_POLL_GROUP_CHECK_QPN(rqpair, wc->qp_num)) {
    2432           1 :                         return rqpair;
    2433             :                 }
    2434             :         }
    2435             : 
    2436           2 :         return NULL;
    2437             : }
    2438             : 
    2439             : static inline void
    2440           0 : nvme_rdma_log_wc_status(struct nvme_rdma_qpair *rqpair, struct ibv_wc *wc)
    2441             : {
    2442           0 :         struct nvme_rdma_wr *rdma_wr = (struct nvme_rdma_wr *)wc->wr_id;
    2443             : 
    2444           0 :         if (wc->status == IBV_WC_WR_FLUSH_ERR) {
    2445             :                 /* If qpair is in ERR state, we will receive completions for all posted and not completed
    2446             :                  * Work Requests with IBV_WC_WR_FLUSH_ERR status. Don't log an error in that case */
    2447           0 :                 SPDK_DEBUGLOG(nvme, "WC error, qid %u, qp state %d, request 0x%lu type %d, status: (%d): %s\n",
    2448             :                               rqpair->qpair.id, rqpair->qpair.state, wc->wr_id, rdma_wr->type, wc->status,
    2449             :                               ibv_wc_status_str(wc->status));
    2450             :         } else {
    2451           0 :                 SPDK_ERRLOG("WC error, qid %u, qp state %d, request 0x%lu type %d, status: (%d): %s\n",
    2452             :                             rqpair->qpair.id, rqpair->qpair.state, wc->wr_id, rdma_wr->type, wc->status,
    2453             :                             ibv_wc_status_str(wc->status));
    2454             :         }
    2455           0 : }
    2456             : 
    2457             : static inline int
    2458           0 : nvme_rdma_process_recv_completion(struct nvme_rdma_poller *poller, struct ibv_wc *wc,
    2459             :                                   struct nvme_rdma_wr *rdma_wr)
    2460             : {
    2461             :         struct nvme_rdma_qpair          *rqpair;
    2462             :         struct spdk_nvme_rdma_req       *rdma_req;
    2463             :         struct spdk_nvme_rdma_rsp       *rdma_rsp;
    2464             : 
    2465           0 :         rdma_rsp = SPDK_CONTAINEROF(rdma_wr, struct spdk_nvme_rdma_rsp, rdma_wr);
    2466             : 
    2467           0 :         if (poller && poller->srq) {
    2468           0 :                 rqpair = get_rdma_qpair_from_wc(poller->group, wc);
    2469           0 :                 if (spdk_unlikely(!rqpair)) {
    2470             :                         /* Since we do not handle the LAST_WQE_REACHED event, we do not know when
    2471             :                          * a Receive Queue in a QP, that is associated with an SRQ, is flushed.
    2472             :                          * We may get a WC for a already destroyed QP.
    2473             :                          *
    2474             :                          * However, for the SRQ, this is not any error. Hence, just re-post the
    2475             :                          * receive request to the SRQ to reuse for other QPs, and return 0.
    2476             :                          */
    2477           0 :                         spdk_rdma_provider_srq_queue_recv_wrs(poller->srq, rdma_rsp->recv_wr);
    2478           0 :                         return 0;
    2479             :                 }
    2480             :         } else {
    2481           0 :                 rqpair = rdma_rsp->rqpair;
    2482           0 :                 if (spdk_unlikely(!rqpair)) {
    2483             :                         /* TODO: Fix forceful QP destroy when it is not async mode.
    2484             :                          * CQ itself did not cause any error. Hence, return 0 for now.
    2485             :                          */
    2486           0 :                         SPDK_WARNLOG("QP might be already destroyed.\n");
    2487           0 :                         return 0;
    2488             :                 }
    2489             :         }
    2490             : 
    2491             : 
    2492           0 :         assert(rqpair->rsps->current_num_recvs > 0);
    2493           0 :         rqpair->rsps->current_num_recvs--;
    2494             : 
    2495           0 :         if (wc->status) {
    2496           0 :                 nvme_rdma_log_wc_status(rqpair, wc);
    2497           0 :                 goto err_wc;
    2498             :         }
    2499             : 
    2500           0 :         SPDK_DEBUGLOG(nvme, "CQ recv completion\n");
    2501             : 
    2502           0 :         if (wc->byte_len < sizeof(struct spdk_nvme_cpl)) {
    2503           0 :                 SPDK_ERRLOG("recv length %u less than expected response size\n", wc->byte_len);
    2504           0 :                 goto err_wc;
    2505             :         }
    2506           0 :         rdma_req = &rqpair->rdma_reqs[rdma_rsp->cpl.cid];
    2507           0 :         rdma_req->completion_flags |= NVME_RDMA_RECV_COMPLETED;
    2508           0 :         rdma_req->rdma_rsp = rdma_rsp;
    2509             : 
    2510           0 :         if ((rdma_req->completion_flags & NVME_RDMA_SEND_COMPLETED) == 0) {
    2511           0 :                 return 0;
    2512             :         }
    2513             : 
    2514           0 :         rqpair->num_completions++;
    2515             : 
    2516           0 :         nvme_rdma_request_ready(rqpair, rdma_req);
    2517             : 
    2518           0 :         if (!rqpair->delay_cmd_submit) {
    2519           0 :                 if (spdk_unlikely(nvme_rdma_qpair_submit_recvs(rqpair))) {
    2520           0 :                         SPDK_ERRLOG("Unable to re-post rx descriptor\n");
    2521           0 :                         nvme_rdma_fail_qpair(&rqpair->qpair, 0);
    2522           0 :                         return -ENXIO;
    2523             :                 }
    2524             :         }
    2525             : 
    2526           0 :         return 1;
    2527             : 
    2528           0 : err_wc:
    2529           0 :         nvme_rdma_fail_qpair(&rqpair->qpair, 0);
    2530           0 :         if (poller && poller->srq) {
    2531           0 :                 spdk_rdma_provider_srq_queue_recv_wrs(poller->srq, rdma_rsp->recv_wr);
    2532             :         }
    2533           0 :         return -ENXIO;
    2534             : }
    2535             : 
    2536             : static inline int
    2537           0 : nvme_rdma_process_send_completion(struct nvme_rdma_poller *poller,
    2538             :                                   struct nvme_rdma_qpair *rdma_qpair,
    2539             :                                   struct ibv_wc *wc, struct nvme_rdma_wr *rdma_wr)
    2540             : {
    2541             :         struct nvme_rdma_qpair          *rqpair;
    2542             :         struct spdk_nvme_rdma_req       *rdma_req;
    2543             : 
    2544           0 :         rdma_req = SPDK_CONTAINEROF(rdma_wr, struct spdk_nvme_rdma_req, rdma_wr);
    2545           0 :         rqpair = rdma_req->req ? nvme_rdma_qpair(rdma_req->req->qpair) : NULL;
    2546           0 :         if (!rqpair) {
    2547           0 :                 rqpair = rdma_qpair != NULL ? rdma_qpair : get_rdma_qpair_from_wc(poller->group, wc);
    2548             :         }
    2549             : 
    2550             :         /* If we are flushing I/O */
    2551           0 :         if (wc->status) {
    2552           0 :                 if (!rqpair) {
    2553             :                         /* When poll_group is used, several qpairs share the same CQ and it is possible to
    2554             :                          * receive a completion with error (e.g. IBV_WC_WR_FLUSH_ERR) for already disconnected qpair
    2555             :                          * That happens due to qpair is destroyed while there are submitted but not completed send/receive
    2556             :                          * Work Requests */
    2557           0 :                         assert(poller);
    2558           0 :                         return 0;
    2559             :                 }
    2560           0 :                 assert(rqpair->current_num_sends > 0);
    2561           0 :                 rqpair->current_num_sends--;
    2562           0 :                 nvme_rdma_log_wc_status(rqpair, wc);
    2563           0 :                 nvme_rdma_fail_qpair(&rqpair->qpair, 0);
    2564           0 :                 if (rdma_req->rdma_rsp && poller && poller->srq) {
    2565           0 :                         spdk_rdma_provider_srq_queue_recv_wrs(poller->srq, rdma_req->rdma_rsp->recv_wr);
    2566             :                 }
    2567           0 :                 return -ENXIO;
    2568             :         }
    2569             : 
    2570             :         /* We do not support Soft Roce anymore. Other than Soft Roce's bug, we should not
    2571             :          * receive a completion without error status after qpair is disconnected/destroyed.
    2572             :          */
    2573           0 :         if (spdk_unlikely(rdma_req->req == NULL)) {
    2574             :                 /*
    2575             :                  * Some infiniband drivers do not guarantee the previous assumption after we
    2576             :                  * received a RDMA_CM_EVENT_DEVICE_REMOVAL event.
    2577             :                  */
    2578           0 :                 SPDK_ERRLOG("Received malformed completion: request 0x%"PRIx64" type %d\n", wc->wr_id,
    2579             :                             rdma_wr->type);
    2580           0 :                 if (!rqpair || !rqpair->need_destroy) {
    2581           0 :                         assert(0);
    2582             :                 }
    2583           0 :                 return -ENXIO;
    2584             :         }
    2585             : 
    2586           0 :         rdma_req->completion_flags |= NVME_RDMA_SEND_COMPLETED;
    2587           0 :         assert(rqpair->current_num_sends > 0);
    2588           0 :         rqpair->current_num_sends--;
    2589             : 
    2590           0 :         if ((rdma_req->completion_flags & NVME_RDMA_RECV_COMPLETED) == 0) {
    2591           0 :                 return 0;
    2592             :         }
    2593             : 
    2594           0 :         rqpair->num_completions++;
    2595             : 
    2596           0 :         nvme_rdma_request_ready(rqpair, rdma_req);
    2597             : 
    2598           0 :         if (!rqpair->delay_cmd_submit) {
    2599           0 :                 if (spdk_unlikely(nvme_rdma_qpair_submit_recvs(rqpair))) {
    2600           0 :                         SPDK_ERRLOG("Unable to re-post rx descriptor\n");
    2601           0 :                         nvme_rdma_fail_qpair(&rqpair->qpair, 0);
    2602           0 :                         return -ENXIO;
    2603             :                 }
    2604             :         }
    2605             : 
    2606           0 :         return 1;
    2607             : }
    2608             : 
    2609             : static int
    2610           0 : nvme_rdma_cq_process_completions(struct ibv_cq *cq, uint32_t batch_size,
    2611             :                                  struct nvme_rdma_poller *poller,
    2612             :                                  struct nvme_rdma_qpair *rdma_qpair,
    2613             :                                  uint64_t *rdma_completions)
    2614             : {
    2615           0 :         struct ibv_wc                   wc[MAX_COMPLETIONS_PER_POLL];
    2616             :         struct nvme_rdma_wr             *rdma_wr;
    2617           0 :         uint32_t                        reaped = 0;
    2618           0 :         int                             completion_rc = 0;
    2619             :         int                             rc, _rc, i;
    2620             : 
    2621           0 :         rc = ibv_poll_cq(cq, batch_size, wc);
    2622           0 :         if (rc < 0) {
    2623           0 :                 SPDK_ERRLOG("Error polling CQ! (%d): %s\n",
    2624             :                             errno, spdk_strerror(errno));
    2625           0 :                 return -ECANCELED;
    2626           0 :         } else if (rc == 0) {
    2627           0 :                 return 0;
    2628             :         }
    2629             : 
    2630           0 :         for (i = 0; i < rc; i++) {
    2631           0 :                 rdma_wr = (struct nvme_rdma_wr *)wc[i].wr_id;
    2632           0 :                 switch (rdma_wr->type) {
    2633           0 :                 case RDMA_WR_TYPE_RECV:
    2634           0 :                         _rc = nvme_rdma_process_recv_completion(poller, &wc[i], rdma_wr);
    2635           0 :                         break;
    2636             : 
    2637           0 :                 case RDMA_WR_TYPE_SEND:
    2638           0 :                         _rc = nvme_rdma_process_send_completion(poller, rdma_qpair, &wc[i], rdma_wr);
    2639           0 :                         break;
    2640             : 
    2641           0 :                 default:
    2642           0 :                         SPDK_ERRLOG("Received an unexpected opcode on the CQ: %d\n", rdma_wr->type);
    2643           0 :                         return -ECANCELED;
    2644             :                 }
    2645           0 :                 if (spdk_likely(_rc >= 0)) {
    2646           0 :                         reaped += _rc;
    2647             :                 } else {
    2648           0 :                         completion_rc = _rc;
    2649             :                 }
    2650             :         }
    2651             : 
    2652           0 :         *rdma_completions += rc;
    2653             : 
    2654           0 :         if (completion_rc) {
    2655           0 :                 return completion_rc;
    2656             :         }
    2657             : 
    2658           0 :         return reaped;
    2659             : }
    2660             : 
    2661             : static void
    2662           0 : dummy_disconnected_qpair_cb(struct spdk_nvme_qpair *qpair, void *poll_group_ctx)
    2663             : {
    2664             : 
    2665           0 : }
    2666             : 
    2667             : static int
    2668           0 : nvme_rdma_qpair_process_completions(struct spdk_nvme_qpair *qpair,
    2669             :                                     uint32_t max_completions)
    2670             : {
    2671           0 :         struct nvme_rdma_qpair          *rqpair = nvme_rdma_qpair(qpair);
    2672           0 :         struct nvme_rdma_ctrlr          *rctrlr = nvme_rdma_ctrlr(qpair->ctrlr);
    2673           0 :         int                             rc = 0, batch_size;
    2674             :         struct ibv_cq                   *cq;
    2675           0 :         uint64_t                        rdma_completions = 0;
    2676             : 
    2677             :         /*
    2678             :          * This is used during the connection phase. It's possible that we are still reaping error completions
    2679             :          * from other qpairs so we need to call the poll group function. Also, it's more correct since the cq
    2680             :          * is shared.
    2681             :          */
    2682           0 :         if (qpair->poll_group != NULL) {
    2683           0 :                 return spdk_nvme_poll_group_process_completions(qpair->poll_group->group, max_completions,
    2684             :                                 dummy_disconnected_qpair_cb);
    2685             :         }
    2686             : 
    2687           0 :         if (max_completions == 0) {
    2688           0 :                 max_completions = rqpair->num_entries;
    2689             :         } else {
    2690           0 :                 max_completions = spdk_min(max_completions, rqpair->num_entries);
    2691             :         }
    2692             : 
    2693           0 :         switch (nvme_qpair_get_state(qpair)) {
    2694           0 :         case NVME_QPAIR_CONNECTING:
    2695           0 :                 rc = nvme_rdma_ctrlr_connect_qpair_poll(qpair->ctrlr, qpair);
    2696           0 :                 if (rc == 0) {
    2697             :                         /* Once the connection is completed, we can submit queued requests */
    2698           0 :                         nvme_qpair_resubmit_requests(qpair, rqpair->num_entries);
    2699           0 :                 } else if (rc != -EAGAIN) {
    2700           0 :                         SPDK_ERRLOG("Failed to connect rqpair=%p\n", rqpair);
    2701           0 :                         goto failed;
    2702           0 :                 } else if (rqpair->state <= NVME_RDMA_QPAIR_STATE_INITIALIZING) {
    2703           0 :                         return 0;
    2704             :                 }
    2705           0 :                 break;
    2706             : 
    2707           0 :         case NVME_QPAIR_DISCONNECTING:
    2708           0 :                 nvme_rdma_ctrlr_disconnect_qpair_poll(qpair->ctrlr, qpair);
    2709           0 :                 return -ENXIO;
    2710             : 
    2711           0 :         default:
    2712           0 :                 if (nvme_qpair_is_admin_queue(qpair)) {
    2713           0 :                         nvme_rdma_poll_events(rctrlr);
    2714             :                 }
    2715           0 :                 nvme_rdma_qpair_process_cm_event(rqpair);
    2716           0 :                 break;
    2717             :         }
    2718             : 
    2719           0 :         if (spdk_unlikely(qpair->transport_failure_reason != SPDK_NVME_QPAIR_FAILURE_NONE)) {
    2720           0 :                 goto failed;
    2721             :         }
    2722             : 
    2723           0 :         cq = rqpair->cq;
    2724             : 
    2725           0 :         rqpair->num_completions = 0;
    2726             :         do {
    2727           0 :                 batch_size = spdk_min((max_completions - rqpair->num_completions), MAX_COMPLETIONS_PER_POLL);
    2728           0 :                 rc = nvme_rdma_cq_process_completions(cq, batch_size, NULL, rqpair, &rdma_completions);
    2729             : 
    2730           0 :                 if (rc == 0) {
    2731           0 :                         break;
    2732             :                         /* Handle the case where we fail to poll the cq. */
    2733           0 :                 } else if (rc == -ECANCELED) {
    2734           0 :                         goto failed;
    2735           0 :                 } else if (rc == -ENXIO) {
    2736           0 :                         return rc;
    2737             :                 }
    2738           0 :         } while (rqpair->num_completions < max_completions);
    2739             : 
    2740           0 :         if (spdk_unlikely(nvme_rdma_qpair_submit_sends(rqpair) ||
    2741             :                           nvme_rdma_qpair_submit_recvs(rqpair))) {
    2742           0 :                 goto failed;
    2743             :         }
    2744             : 
    2745           0 :         if (spdk_unlikely(qpair->ctrlr->timeout_enabled)) {
    2746           0 :                 nvme_rdma_qpair_check_timeout(qpair);
    2747             :         }
    2748             : 
    2749           0 :         return rqpair->num_completions;
    2750             : 
    2751           0 : failed:
    2752           0 :         nvme_rdma_fail_qpair(qpair, 0);
    2753           0 :         return -ENXIO;
    2754             : }
    2755             : 
    2756             : static uint32_t
    2757           0 : nvme_rdma_ctrlr_get_max_xfer_size(struct spdk_nvme_ctrlr *ctrlr)
    2758             : {
    2759             :         /* max_mr_size by ibv_query_device indicates the largest value that we can
    2760             :          * set for a registered memory region.  It is independent from the actual
    2761             :          * I/O size and is very likely to be larger than 2 MiB which is the
    2762             :          * granularity we currently register memory regions.  Hence return
    2763             :          * UINT32_MAX here and let the generic layer use the controller data to
    2764             :          * moderate this value.
    2765             :          */
    2766           0 :         return UINT32_MAX;
    2767             : }
    2768             : 
    2769             : static uint16_t
    2770           5 : nvme_rdma_ctrlr_get_max_sges(struct spdk_nvme_ctrlr *ctrlr)
    2771             : {
    2772           5 :         struct nvme_rdma_ctrlr *rctrlr = nvme_rdma_ctrlr(ctrlr);
    2773           5 :         uint32_t max_sge = rctrlr->max_sge;
    2774           5 :         uint32_t max_in_capsule_sge = (ctrlr->cdata.nvmf_specific.ioccsz * 16 -
    2775           5 :                                        sizeof(struct spdk_nvme_cmd)) /
    2776             :                                       sizeof(struct spdk_nvme_sgl_descriptor);
    2777             : 
    2778             :         /* Max SGE is limited by capsule size */
    2779           5 :         max_sge = spdk_min(max_sge, max_in_capsule_sge);
    2780             :         /* Max SGE may be limited by MSDBD */
    2781           5 :         if (ctrlr->cdata.nvmf_specific.msdbd != 0) {
    2782           5 :                 max_sge = spdk_min(max_sge, ctrlr->cdata.nvmf_specific.msdbd);
    2783             :         }
    2784             : 
    2785             :         /* Max SGE can't be less than 1 */
    2786           5 :         max_sge = spdk_max(1, max_sge);
    2787           5 :         return max_sge;
    2788             : }
    2789             : 
    2790             : static int
    2791           0 : nvme_rdma_qpair_iterate_requests(struct spdk_nvme_qpair *qpair,
    2792             :                                  int (*iter_fn)(struct nvme_request *req, void *arg),
    2793             :                                  void *arg)
    2794             : {
    2795           0 :         struct nvme_rdma_qpair *rqpair = nvme_rdma_qpair(qpair);
    2796             :         struct spdk_nvme_rdma_req *rdma_req, *tmp;
    2797             :         int rc;
    2798             : 
    2799           0 :         assert(iter_fn != NULL);
    2800             : 
    2801           0 :         TAILQ_FOREACH_SAFE(rdma_req, &rqpair->outstanding_reqs, link, tmp) {
    2802           0 :                 assert(rdma_req->req != NULL);
    2803             : 
    2804           0 :                 rc = iter_fn(rdma_req->req, arg);
    2805           0 :                 if (rc != 0) {
    2806           0 :                         return rc;
    2807             :                 }
    2808             :         }
    2809             : 
    2810           0 :         return 0;
    2811             : }
    2812             : 
    2813             : static void
    2814           0 : nvme_rdma_admin_qpair_abort_aers(struct spdk_nvme_qpair *qpair)
    2815             : {
    2816             :         struct spdk_nvme_rdma_req *rdma_req, *tmp;
    2817           0 :         struct spdk_nvme_cpl cpl;
    2818           0 :         struct nvme_rdma_qpair *rqpair = nvme_rdma_qpair(qpair);
    2819             : 
    2820           0 :         cpl.status.sc = SPDK_NVME_SC_ABORTED_SQ_DELETION;
    2821           0 :         cpl.status.sct = SPDK_NVME_SCT_GENERIC;
    2822             : 
    2823           0 :         TAILQ_FOREACH_SAFE(rdma_req, &rqpair->outstanding_reqs, link, tmp) {
    2824           0 :                 assert(rdma_req->req != NULL);
    2825             : 
    2826           0 :                 if (rdma_req->req->cmd.opc != SPDK_NVME_OPC_ASYNC_EVENT_REQUEST) {
    2827           0 :                         continue;
    2828             :                 }
    2829             : 
    2830           0 :                 nvme_rdma_req_complete(rdma_req, &cpl, false);
    2831             :         }
    2832           0 : }
    2833             : 
    2834             : static void
    2835           9 : nvme_rdma_poller_destroy(struct nvme_rdma_poller *poller)
    2836             : {
    2837           9 :         if (poller->cq) {
    2838           7 :                 ibv_destroy_cq(poller->cq);
    2839             :         }
    2840           9 :         if (poller->rsps) {
    2841           0 :                 nvme_rdma_free_rsps(poller->rsps);
    2842             :         }
    2843           9 :         if (poller->srq) {
    2844           0 :                 spdk_rdma_provider_srq_destroy(poller->srq);
    2845             :         }
    2846           9 :         if (poller->mr_map) {
    2847           0 :                 spdk_rdma_utils_free_mem_map(&poller->mr_map);
    2848             :         }
    2849           9 :         if (poller->pd) {
    2850           0 :                 spdk_rdma_utils_put_pd(poller->pd);
    2851             :         }
    2852           9 :         free(poller);
    2853           9 : }
    2854             : 
    2855             : static struct nvme_rdma_poller *
    2856           9 : nvme_rdma_poller_create(struct nvme_rdma_poll_group *group, struct ibv_context *ctx)
    2857             : {
    2858             :         struct nvme_rdma_poller *poller;
    2859           9 :         struct ibv_device_attr dev_attr;
    2860           9 :         struct spdk_rdma_provider_srq_init_attr srq_init_attr = {};
    2861           9 :         struct nvme_rdma_rsp_opts opts;
    2862             :         int num_cqe, max_num_cqe;
    2863             :         int rc;
    2864             : 
    2865           9 :         poller = calloc(1, sizeof(*poller));
    2866           9 :         if (poller == NULL) {
    2867           0 :                 SPDK_ERRLOG("Unable to allocate poller.\n");
    2868           0 :                 return NULL;
    2869             :         }
    2870             : 
    2871           9 :         poller->group = group;
    2872           9 :         poller->device = ctx;
    2873             : 
    2874           9 :         if (g_spdk_nvme_transport_opts.rdma_srq_size != 0) {
    2875           0 :                 rc = ibv_query_device(ctx, &dev_attr);
    2876           0 :                 if (rc) {
    2877           0 :                         SPDK_ERRLOG("Unable to query RDMA device.\n");
    2878           0 :                         goto fail;
    2879             :                 }
    2880             : 
    2881           0 :                 poller->pd = spdk_rdma_utils_get_pd(ctx);
    2882           0 :                 if (poller->pd == NULL) {
    2883           0 :                         SPDK_ERRLOG("Unable to get PD.\n");
    2884           0 :                         goto fail;
    2885             :                 }
    2886             : 
    2887           0 :                 poller->mr_map = spdk_rdma_utils_create_mem_map(poller->pd, &g_nvme_hooks,
    2888             :                                  IBV_ACCESS_LOCAL_WRITE | IBV_ACCESS_REMOTE_READ | IBV_ACCESS_REMOTE_WRITE);
    2889           0 :                 if (poller->mr_map == NULL) {
    2890           0 :                         SPDK_ERRLOG("Unable to create memory map.\n");
    2891           0 :                         goto fail;
    2892             :                 }
    2893             : 
    2894           0 :                 srq_init_attr.stats = &poller->stats.rdma_stats.recv;
    2895           0 :                 srq_init_attr.pd = poller->pd;
    2896           0 :                 srq_init_attr.srq_init_attr.attr.max_wr = spdk_min((uint32_t)dev_attr.max_srq_wr,
    2897             :                                 g_spdk_nvme_transport_opts.rdma_srq_size);
    2898           0 :                 srq_init_attr.srq_init_attr.attr.max_sge = spdk_min(dev_attr.max_sge,
    2899             :                                 NVME_RDMA_DEFAULT_RX_SGE);
    2900             : 
    2901           0 :                 poller->srq = spdk_rdma_provider_srq_create(&srq_init_attr);
    2902           0 :                 if (poller->srq == NULL) {
    2903           0 :                         SPDK_ERRLOG("Unable to create SRQ.\n");
    2904           0 :                         goto fail;
    2905             :                 }
    2906             : 
    2907           0 :                 opts.num_entries = g_spdk_nvme_transport_opts.rdma_srq_size;
    2908           0 :                 opts.rqpair = NULL;
    2909           0 :                 opts.srq = poller->srq;
    2910           0 :                 opts.mr_map = poller->mr_map;
    2911             : 
    2912           0 :                 poller->rsps = nvme_rdma_create_rsps(&opts);
    2913           0 :                 if (poller->rsps == NULL) {
    2914           0 :                         SPDK_ERRLOG("Unable to create poller RDMA responses.\n");
    2915           0 :                         goto fail;
    2916             :                 }
    2917             : 
    2918           0 :                 rc = nvme_rdma_poller_submit_recvs(poller);
    2919           0 :                 if (rc) {
    2920           0 :                         SPDK_ERRLOG("Unable to submit poller RDMA responses.\n");
    2921           0 :                         goto fail;
    2922             :                 }
    2923             : 
    2924             :                 /*
    2925             :                  * When using an srq, fix the size of the completion queue at startup.
    2926             :                  * The initiator sends only send and recv WRs. Hence, the multiplier is 2.
    2927             :                  * (The target sends also data WRs. Hence, the multiplier is 3.)
    2928             :                  */
    2929           0 :                 num_cqe = g_spdk_nvme_transport_opts.rdma_srq_size * 2;
    2930             :         } else {
    2931           9 :                 num_cqe = DEFAULT_NVME_RDMA_CQ_SIZE;
    2932             :         }
    2933             : 
    2934           9 :         max_num_cqe = g_spdk_nvme_transport_opts.rdma_max_cq_size;
    2935           9 :         if (max_num_cqe != 0 && num_cqe > max_num_cqe) {
    2936           0 :                 num_cqe = max_num_cqe;
    2937             :         }
    2938             : 
    2939           9 :         poller->cq = ibv_create_cq(poller->device, num_cqe, group, NULL, 0);
    2940             : 
    2941           9 :         if (poller->cq == NULL) {
    2942           2 :                 SPDK_ERRLOG("Unable to create CQ, errno %d.\n", errno);
    2943           2 :                 goto fail;
    2944             :         }
    2945             : 
    2946           7 :         STAILQ_INSERT_HEAD(&group->pollers, poller, link);
    2947           7 :         group->num_pollers++;
    2948           7 :         poller->current_num_wc = num_cqe;
    2949           7 :         poller->required_num_wc = 0;
    2950           7 :         return poller;
    2951             : 
    2952           2 : fail:
    2953           2 :         nvme_rdma_poller_destroy(poller);
    2954           2 :         return NULL;
    2955             : }
    2956             : 
    2957             : static void
    2958           3 : nvme_rdma_poll_group_free_pollers(struct nvme_rdma_poll_group *group)
    2959             : {
    2960             :         struct nvme_rdma_poller *poller, *tmp_poller;
    2961             : 
    2962           5 :         STAILQ_FOREACH_SAFE(poller, &group->pollers, link, tmp_poller) {
    2963           2 :                 assert(poller->refcnt == 0);
    2964           2 :                 if (poller->refcnt) {
    2965           0 :                         SPDK_WARNLOG("Destroying poller with non-zero ref count: poller %p, refcnt %d\n",
    2966             :                                      poller, poller->refcnt);
    2967             :                 }
    2968             : 
    2969           2 :                 STAILQ_REMOVE(&group->pollers, poller, nvme_rdma_poller, link);
    2970           2 :                 nvme_rdma_poller_destroy(poller);
    2971             :         }
    2972           3 : }
    2973             : 
    2974             : static struct nvme_rdma_poller *
    2975           8 : nvme_rdma_poll_group_get_poller(struct nvme_rdma_poll_group *group, struct ibv_context *device)
    2976             : {
    2977           8 :         struct nvme_rdma_poller *poller = NULL;
    2978             : 
    2979          10 :         STAILQ_FOREACH(poller, &group->pollers, link) {
    2980           3 :                 if (poller->device == device) {
    2981           1 :                         break;
    2982             :                 }
    2983             :         }
    2984             : 
    2985           8 :         if (!poller) {
    2986           7 :                 poller = nvme_rdma_poller_create(group, device);
    2987           7 :                 if (!poller) {
    2988           2 :                         SPDK_ERRLOG("Failed to create a poller for device %p\n", device);
    2989           2 :                         return NULL;
    2990             :                 }
    2991             :         }
    2992             : 
    2993           6 :         poller->refcnt++;
    2994           6 :         return poller;
    2995             : }
    2996             : 
    2997             : static void
    2998           6 : nvme_rdma_poll_group_put_poller(struct nvme_rdma_poll_group *group, struct nvme_rdma_poller *poller)
    2999             : {
    3000           6 :         assert(poller->refcnt > 0);
    3001           6 :         if (--poller->refcnt == 0) {
    3002           5 :                 STAILQ_REMOVE(&group->pollers, poller, nvme_rdma_poller, link);
    3003           5 :                 group->num_pollers--;
    3004           5 :                 nvme_rdma_poller_destroy(poller);
    3005             :         }
    3006           6 : }
    3007             : 
    3008             : static struct spdk_nvme_transport_poll_group *
    3009           1 : nvme_rdma_poll_group_create(void)
    3010             : {
    3011             :         struct nvme_rdma_poll_group     *group;
    3012             : 
    3013           1 :         group = calloc(1, sizeof(*group));
    3014           1 :         if (group == NULL) {
    3015           0 :                 SPDK_ERRLOG("Unable to allocate poll group.\n");
    3016           0 :                 return NULL;
    3017             :         }
    3018             : 
    3019           1 :         STAILQ_INIT(&group->pollers);
    3020           1 :         TAILQ_INIT(&group->connecting_qpairs);
    3021           1 :         TAILQ_INIT(&group->active_qpairs);
    3022           1 :         return &group->group;
    3023             : }
    3024             : 
    3025             : static int
    3026           0 : nvme_rdma_poll_group_connect_qpair(struct spdk_nvme_qpair *qpair)
    3027             : {
    3028           0 :         return 0;
    3029             : }
    3030             : 
    3031             : static int
    3032           0 : nvme_rdma_poll_group_disconnect_qpair(struct spdk_nvme_qpair *qpair)
    3033             : {
    3034           0 :         struct nvme_rdma_qpair *rqpair = nvme_rdma_qpair(qpair);
    3035           0 :         struct nvme_rdma_poll_group *group = nvme_rdma_poll_group(qpair->poll_group);
    3036             : 
    3037           0 :         if (rqpair->link_connecting.tqe_prev) {
    3038           0 :                 TAILQ_REMOVE(&group->connecting_qpairs, rqpair, link_connecting);
    3039             :                 /* We use prev pointer to check if qpair is in connecting list or not .
    3040             :                  * TAILQ_REMOVE doesn't do it. So, we do it manually.
    3041             :                  */
    3042           0 :                 rqpair->link_connecting.tqe_prev = NULL;
    3043             :         }
    3044             : 
    3045           0 :         return 0;
    3046             : }
    3047             : 
    3048             : static int
    3049           0 : nvme_rdma_poll_group_add(struct spdk_nvme_transport_poll_group *tgroup,
    3050             :                          struct spdk_nvme_qpair *qpair)
    3051             : {
    3052           0 :         return 0;
    3053             : }
    3054             : 
    3055             : static int
    3056           0 : nvme_rdma_poll_group_remove(struct spdk_nvme_transport_poll_group *tgroup,
    3057             :                             struct spdk_nvme_qpair *qpair)
    3058             : {
    3059           0 :         struct nvme_rdma_qpair *rqpair = nvme_rdma_qpair(qpair);
    3060           0 :         struct nvme_rdma_poll_group *group = nvme_rdma_poll_group(qpair->poll_group);
    3061             : 
    3062           0 :         if (rqpair->link_active.tqe_prev) {
    3063           0 :                 TAILQ_REMOVE(&group->active_qpairs, rqpair, link_active);
    3064           0 :                 rqpair->link_active.tqe_prev = NULL;
    3065             :         }
    3066             : 
    3067           0 :         return 0;
    3068             : }
    3069             : 
    3070             : static inline void
    3071           0 : nvme_rdma_qpair_process_submits(struct nvme_rdma_poll_group *group,
    3072             :                                 struct nvme_rdma_qpair *rqpair)
    3073             : {
    3074           0 :         struct spdk_nvme_qpair  *qpair = &rqpair->qpair;
    3075             : 
    3076           0 :         assert(rqpair->link_active.tqe_prev != NULL);
    3077             : 
    3078           0 :         if (spdk_unlikely(rqpair->state <= NVME_RDMA_QPAIR_STATE_INITIALIZING ||
    3079             :                           rqpair->state >= NVME_RDMA_QPAIR_STATE_EXITING)) {
    3080           0 :                 return;
    3081             :         }
    3082             : 
    3083           0 :         if (spdk_unlikely(qpair->ctrlr->timeout_enabled)) {
    3084           0 :                 nvme_rdma_qpair_check_timeout(qpair);
    3085             :         }
    3086             : 
    3087           0 :         nvme_rdma_qpair_submit_sends(rqpair);
    3088           0 :         if (!rqpair->srq) {
    3089           0 :                 nvme_rdma_qpair_submit_recvs(rqpair);
    3090             :         }
    3091           0 :         if (rqpair->num_completions > 0) {
    3092           0 :                 nvme_qpair_resubmit_requests(qpair, rqpair->num_completions);
    3093           0 :                 rqpair->num_completions = 0;
    3094             :         }
    3095             : 
    3096           0 :         if (rqpair->num_outstanding_reqs == 0 && STAILQ_EMPTY(&qpair->queued_req)) {
    3097           0 :                 TAILQ_REMOVE(&group->active_qpairs, rqpair, link_active);
    3098             :                 /* We use prev pointer to check if qpair is in active list or not.
    3099             :                  * TAILQ_REMOVE doesn't do it. So, we do it manually.
    3100             :                  */
    3101           0 :                 rqpair->link_active.tqe_prev = NULL;
    3102             :         }
    3103             : }
    3104             : 
    3105             : static int64_t
    3106           0 : nvme_rdma_poll_group_process_completions(struct spdk_nvme_transport_poll_group *tgroup,
    3107             :                 uint32_t completions_per_qpair, spdk_nvme_disconnected_qpair_cb disconnected_qpair_cb)
    3108             : {
    3109             :         struct spdk_nvme_qpair                  *qpair, *tmp_qpair;
    3110             :         struct nvme_rdma_qpair                  *rqpair, *tmp_rqpair;
    3111             :         struct nvme_rdma_poll_group             *group;
    3112             :         struct nvme_rdma_poller                 *poller;
    3113           0 :         int                                     batch_size, rc, rc2 = 0;
    3114           0 :         int64_t                                 total_completions = 0;
    3115           0 :         uint64_t                                completions_allowed = 0;
    3116           0 :         uint64_t                                completions_per_poller = 0;
    3117           0 :         uint64_t                                poller_completions = 0;
    3118           0 :         uint64_t                                rdma_completions;
    3119             : 
    3120           0 :         if (completions_per_qpair == 0) {
    3121           0 :                 completions_per_qpair = MAX_COMPLETIONS_PER_POLL;
    3122             :         }
    3123             : 
    3124           0 :         group = nvme_rdma_poll_group(tgroup);
    3125             : 
    3126           0 :         STAILQ_FOREACH_SAFE(qpair, &tgroup->disconnected_qpairs, poll_group_stailq, tmp_qpair) {
    3127           0 :                 rc = nvme_rdma_ctrlr_disconnect_qpair_poll(qpair->ctrlr, qpair);
    3128           0 :                 if (rc == 0) {
    3129           0 :                         disconnected_qpair_cb(qpair, tgroup->group->ctx);
    3130             :                 }
    3131             :         }
    3132             : 
    3133           0 :         TAILQ_FOREACH_SAFE(rqpair, &group->connecting_qpairs, link_connecting, tmp_rqpair) {
    3134           0 :                 qpair = &rqpair->qpair;
    3135             : 
    3136           0 :                 rc = nvme_rdma_ctrlr_connect_qpair_poll(qpair->ctrlr, qpair);
    3137           0 :                 if (rc == 0 || rc != -EAGAIN) {
    3138           0 :                         TAILQ_REMOVE(&group->connecting_qpairs, rqpair, link_connecting);
    3139             :                         /* We use prev pointer to check if qpair is in connecting list or not.
    3140             :                          * TAILQ_REMOVE does not do it. So, we do it manually.
    3141             :                          */
    3142           0 :                         rqpair->link_connecting.tqe_prev = NULL;
    3143             : 
    3144           0 :                         if (rc == 0) {
    3145             :                                 /* Once the connection is completed, we can submit queued requests */
    3146           0 :                                 nvme_qpair_resubmit_requests(qpair, rqpair->num_entries);
    3147           0 :                         } else if (rc != -EAGAIN) {
    3148           0 :                                 SPDK_ERRLOG("Failed to connect rqpair=%p\n", rqpair);
    3149           0 :                                 nvme_rdma_fail_qpair(qpair, 0);
    3150             :                         }
    3151             :                 }
    3152             :         }
    3153             : 
    3154           0 :         STAILQ_FOREACH_SAFE(qpair, &tgroup->connected_qpairs, poll_group_stailq, tmp_qpair) {
    3155           0 :                 rqpair = nvme_rdma_qpair(qpair);
    3156             : 
    3157           0 :                 if (spdk_likely(nvme_qpair_get_state(qpair) != NVME_QPAIR_CONNECTING)) {
    3158           0 :                         nvme_rdma_qpair_process_cm_event(rqpair);
    3159             :                 }
    3160             : 
    3161           0 :                 if (spdk_unlikely(qpair->transport_failure_reason != SPDK_NVME_QPAIR_FAILURE_NONE)) {
    3162           0 :                         rc2 = -ENXIO;
    3163           0 :                         nvme_rdma_fail_qpair(qpair, 0);
    3164             :                 }
    3165             :         }
    3166             : 
    3167           0 :         completions_allowed = completions_per_qpair * tgroup->num_connected_qpairs;
    3168           0 :         if (group->num_pollers) {
    3169           0 :                 completions_per_poller = spdk_max(completions_allowed / group->num_pollers, 1);
    3170             :         }
    3171             : 
    3172           0 :         STAILQ_FOREACH(poller, &group->pollers, link) {
    3173           0 :                 poller_completions = 0;
    3174           0 :                 rdma_completions = 0;
    3175             :                 do {
    3176           0 :                         poller->stats.polls++;
    3177           0 :                         batch_size = spdk_min((completions_per_poller - poller_completions), MAX_COMPLETIONS_PER_POLL);
    3178           0 :                         rc = nvme_rdma_cq_process_completions(poller->cq, batch_size, poller, NULL, &rdma_completions);
    3179           0 :                         if (rc <= 0) {
    3180           0 :                                 if (rc == -ECANCELED) {
    3181           0 :                                         return -EIO;
    3182           0 :                                 } else if (rc == 0) {
    3183           0 :                                         poller->stats.idle_polls++;
    3184             :                                 }
    3185           0 :                                 break;
    3186             :                         }
    3187             : 
    3188           0 :                         poller_completions += rc;
    3189           0 :                 } while (poller_completions < completions_per_poller);
    3190           0 :                 total_completions += poller_completions;
    3191           0 :                 poller->stats.completions += rdma_completions;
    3192           0 :                 if (poller->srq) {
    3193           0 :                         nvme_rdma_poller_submit_recvs(poller);
    3194             :                 }
    3195             :         }
    3196             : 
    3197           0 :         TAILQ_FOREACH_SAFE(rqpair, &group->active_qpairs, link_active, tmp_rqpair) {
    3198           0 :                 nvme_rdma_qpair_process_submits(group, rqpair);
    3199             :         }
    3200             : 
    3201           0 :         return rc2 != 0 ? rc2 : total_completions;
    3202             : }
    3203             : 
    3204             : static int
    3205           1 : nvme_rdma_poll_group_destroy(struct spdk_nvme_transport_poll_group *tgroup)
    3206             : {
    3207           1 :         struct nvme_rdma_poll_group     *group = nvme_rdma_poll_group(tgroup);
    3208             : 
    3209           1 :         if (!STAILQ_EMPTY(&tgroup->connected_qpairs) || !STAILQ_EMPTY(&tgroup->disconnected_qpairs)) {
    3210           0 :                 return -EBUSY;
    3211             :         }
    3212             : 
    3213           1 :         nvme_rdma_poll_group_free_pollers(group);
    3214           1 :         free(group);
    3215             : 
    3216           1 :         return 0;
    3217             : }
    3218             : 
    3219             : static int
    3220           3 : nvme_rdma_poll_group_get_stats(struct spdk_nvme_transport_poll_group *tgroup,
    3221             :                                struct spdk_nvme_transport_poll_group_stat **_stats)
    3222             : {
    3223             :         struct nvme_rdma_poll_group *group;
    3224             :         struct spdk_nvme_transport_poll_group_stat *stats;
    3225             :         struct spdk_nvme_rdma_device_stat *device_stat;
    3226             :         struct nvme_rdma_poller *poller;
    3227           3 :         uint32_t i = 0;
    3228             : 
    3229           3 :         if (tgroup == NULL || _stats == NULL) {
    3230           2 :                 SPDK_ERRLOG("Invalid stats or group pointer\n");
    3231           2 :                 return -EINVAL;
    3232             :         }
    3233             : 
    3234           1 :         group = nvme_rdma_poll_group(tgroup);
    3235           1 :         stats = calloc(1, sizeof(*stats));
    3236           1 :         if (!stats) {
    3237           0 :                 SPDK_ERRLOG("Can't allocate memory for RDMA stats\n");
    3238           0 :                 return -ENOMEM;
    3239             :         }
    3240           1 :         stats->trtype = SPDK_NVME_TRANSPORT_RDMA;
    3241           1 :         stats->rdma.num_devices = group->num_pollers;
    3242             : 
    3243           1 :         if (stats->rdma.num_devices == 0) {
    3244           0 :                 *_stats = stats;
    3245           0 :                 return 0;
    3246             :         }
    3247             : 
    3248           1 :         stats->rdma.device_stats = calloc(stats->rdma.num_devices, sizeof(*stats->rdma.device_stats));
    3249           1 :         if (!stats->rdma.device_stats) {
    3250           0 :                 SPDK_ERRLOG("Can't allocate memory for RDMA device stats\n");
    3251           0 :                 free(stats);
    3252           0 :                 return -ENOMEM;
    3253             :         }
    3254             : 
    3255           3 :         STAILQ_FOREACH(poller, &group->pollers, link) {
    3256           2 :                 device_stat = &stats->rdma.device_stats[i];
    3257           2 :                 device_stat->name = poller->device->device->name;
    3258           2 :                 device_stat->polls = poller->stats.polls;
    3259           2 :                 device_stat->idle_polls = poller->stats.idle_polls;
    3260           2 :                 device_stat->completions = poller->stats.completions;
    3261           2 :                 device_stat->queued_requests = poller->stats.queued_requests;
    3262           2 :                 device_stat->total_send_wrs = poller->stats.rdma_stats.send.num_submitted_wrs;
    3263           2 :                 device_stat->send_doorbell_updates = poller->stats.rdma_stats.send.doorbell_updates;
    3264           2 :                 device_stat->total_recv_wrs = poller->stats.rdma_stats.recv.num_submitted_wrs;
    3265           2 :                 device_stat->recv_doorbell_updates = poller->stats.rdma_stats.recv.doorbell_updates;
    3266           2 :                 i++;
    3267             :         }
    3268             : 
    3269           1 :         *_stats = stats;
    3270             : 
    3271           1 :         return 0;
    3272             : }
    3273             : 
    3274             : static void
    3275           1 : nvme_rdma_poll_group_free_stats(struct spdk_nvme_transport_poll_group *tgroup,
    3276             :                                 struct spdk_nvme_transport_poll_group_stat *stats)
    3277             : {
    3278           1 :         if (stats) {
    3279           1 :                 free(stats->rdma.device_stats);
    3280             :         }
    3281           1 :         free(stats);
    3282           1 : }
    3283             : 
    3284             : static int
    3285           4 : nvme_rdma_ctrlr_get_memory_domains(const struct spdk_nvme_ctrlr *ctrlr,
    3286             :                                    struct spdk_memory_domain **domains, int array_size)
    3287             : {
    3288           4 :         struct nvme_rdma_qpair *rqpair = nvme_rdma_qpair(ctrlr->adminq);
    3289             : 
    3290           4 :         if (domains && array_size > 0) {
    3291           1 :                 domains[0] = rqpair->memory_domain;
    3292             :         }
    3293             : 
    3294           4 :         return 1;
    3295             : }
    3296             : 
    3297             : void
    3298           0 : spdk_nvme_rdma_init_hooks(struct spdk_nvme_rdma_hooks *hooks)
    3299             : {
    3300           0 :         g_nvme_hooks = *hooks;
    3301           0 : }
    3302             : 
    3303             : const struct spdk_nvme_transport_ops rdma_ops = {
    3304             :         .name = "RDMA",
    3305             :         .type = SPDK_NVME_TRANSPORT_RDMA,
    3306             :         .ctrlr_construct = nvme_rdma_ctrlr_construct,
    3307             :         .ctrlr_scan = nvme_fabric_ctrlr_scan,
    3308             :         .ctrlr_destruct = nvme_rdma_ctrlr_destruct,
    3309             :         .ctrlr_enable = nvme_rdma_ctrlr_enable,
    3310             : 
    3311             :         .ctrlr_set_reg_4 = nvme_fabric_ctrlr_set_reg_4,
    3312             :         .ctrlr_set_reg_8 = nvme_fabric_ctrlr_set_reg_8,
    3313             :         .ctrlr_get_reg_4 = nvme_fabric_ctrlr_get_reg_4,
    3314             :         .ctrlr_get_reg_8 = nvme_fabric_ctrlr_get_reg_8,
    3315             :         .ctrlr_set_reg_4_async = nvme_fabric_ctrlr_set_reg_4_async,
    3316             :         .ctrlr_set_reg_8_async = nvme_fabric_ctrlr_set_reg_8_async,
    3317             :         .ctrlr_get_reg_4_async = nvme_fabric_ctrlr_get_reg_4_async,
    3318             :         .ctrlr_get_reg_8_async = nvme_fabric_ctrlr_get_reg_8_async,
    3319             : 
    3320             :         .ctrlr_get_max_xfer_size = nvme_rdma_ctrlr_get_max_xfer_size,
    3321             :         .ctrlr_get_max_sges = nvme_rdma_ctrlr_get_max_sges,
    3322             : 
    3323             :         .ctrlr_create_io_qpair = nvme_rdma_ctrlr_create_io_qpair,
    3324             :         .ctrlr_delete_io_qpair = nvme_rdma_ctrlr_delete_io_qpair,
    3325             :         .ctrlr_connect_qpair = nvme_rdma_ctrlr_connect_qpair,
    3326             :         .ctrlr_disconnect_qpair = nvme_rdma_ctrlr_disconnect_qpair,
    3327             : 
    3328             :         .ctrlr_get_memory_domains = nvme_rdma_ctrlr_get_memory_domains,
    3329             : 
    3330             :         .qpair_abort_reqs = nvme_rdma_qpair_abort_reqs,
    3331             :         .qpair_reset = nvme_rdma_qpair_reset,
    3332             :         .qpair_submit_request = nvme_rdma_qpair_submit_request,
    3333             :         .qpair_process_completions = nvme_rdma_qpair_process_completions,
    3334             :         .qpair_iterate_requests = nvme_rdma_qpair_iterate_requests,
    3335             :         .admin_qpair_abort_aers = nvme_rdma_admin_qpair_abort_aers,
    3336             : 
    3337             :         .poll_group_create = nvme_rdma_poll_group_create,
    3338             :         .poll_group_connect_qpair = nvme_rdma_poll_group_connect_qpair,
    3339             :         .poll_group_disconnect_qpair = nvme_rdma_poll_group_disconnect_qpair,
    3340             :         .poll_group_add = nvme_rdma_poll_group_add,
    3341             :         .poll_group_remove = nvme_rdma_poll_group_remove,
    3342             :         .poll_group_process_completions = nvme_rdma_poll_group_process_completions,
    3343             :         .poll_group_destroy = nvme_rdma_poll_group_destroy,
    3344             :         .poll_group_get_stats = nvme_rdma_poll_group_get_stats,
    3345             :         .poll_group_free_stats = nvme_rdma_poll_group_free_stats,
    3346             : };
    3347             : 
    3348           1 : SPDK_NVME_TRANSPORT_REGISTER(rdma, &rdma_ops);

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