Line data Source code
1 : /* SPDX-License-Identifier: BSD-3-Clause
2 : * Copyright (C) 2017 Intel Corporation.
3 : * All rights reserved.
4 : */
5 :
6 : #ifndef SPDK_VHOST_INTERNAL_H
7 : #define SPDK_VHOST_INTERNAL_H
8 : #include <linux/virtio_config.h>
9 :
10 : #include "spdk/stdinc.h"
11 :
12 : #include <rte_vhost.h>
13 :
14 : #include "spdk_internal/vhost_user.h"
15 : #include "spdk/bdev.h"
16 : #include "spdk/log.h"
17 : #include "spdk/util.h"
18 : #include "spdk/rpc.h"
19 : #include "spdk/config.h"
20 : #include "spdk/tree.h"
21 :
22 : #define SPDK_VHOST_MAX_VQUEUES 256
23 : #define SPDK_VHOST_MAX_VQ_SIZE 1024
24 :
25 : #define SPDK_VHOST_SCSI_CTRLR_MAX_DEVS 8
26 :
27 : #define SPDK_VHOST_IOVS_MAX 129
28 :
29 : #define SPDK_VHOST_VQ_MAX_SUBMISSIONS 32
30 :
31 : /*
32 : * Rate at which stats are checked for interrupt coalescing.
33 : */
34 : #define SPDK_VHOST_STATS_CHECK_INTERVAL_MS 10
35 : /*
36 : * Default threshold at which interrupts start to be coalesced.
37 : */
38 : #define SPDK_VHOST_VQ_IOPS_COALESCING_THRESHOLD 60000
39 :
40 : /*
41 : * Timeout in seconds for vhost-user session stop message.
42 : */
43 : #define SPDK_VHOST_SESSION_STOP_TIMEOUT_IN_SEC 3
44 : /*
45 : * Stop retry timeout in seconds, this value should be greater than SPDK_VHOST_SESSION_STOP_TIMEOUT_IN_SEC.
46 : */
47 : #define SPDK_VHOST_SESSION_STOP_RETRY_TIMEOUT_IN_SEC (SPDK_VHOST_SESSION_STOP_TIMEOUT_IN_SEC + 1)
48 : /*
49 : * Stop retry period in microseconds
50 : */
51 : #define SPDK_VHOST_SESSION_STOP_RETRY_PERIOD_IN_US 1000
52 :
53 : /*
54 : * Currently coalescing is not used by default.
55 : * Setting this to value > 0 here or by RPC will enable coalescing.
56 : */
57 : #define SPDK_VHOST_COALESCING_DELAY_BASE_US 0
58 :
59 : #define SPDK_VHOST_FEATURES ((1ULL << VHOST_F_LOG_ALL) | \
60 : (1ULL << VHOST_USER_F_PROTOCOL_FEATURES) | \
61 : (1ULL << VIRTIO_F_VERSION_1) | \
62 : (1ULL << VIRTIO_F_NOTIFY_ON_EMPTY) | \
63 : (1ULL << VIRTIO_RING_F_EVENT_IDX) | \
64 : (1ULL << VIRTIO_RING_F_INDIRECT_DESC) | \
65 : (1ULL << VIRTIO_F_ANY_LAYOUT))
66 :
67 : #define SPDK_VHOST_DISABLED_FEATURES ((1ULL << VIRTIO_RING_F_EVENT_IDX) | \
68 : (1ULL << VIRTIO_F_NOTIFY_ON_EMPTY))
69 :
70 : #define VRING_DESC_F_AVAIL (1ULL << VRING_PACKED_DESC_F_AVAIL)
71 : #define VRING_DESC_F_USED (1ULL << VRING_PACKED_DESC_F_USED)
72 : #define VRING_DESC_F_AVAIL_USED (VRING_DESC_F_AVAIL | VRING_DESC_F_USED)
73 :
74 : typedef struct rte_vhost_resubmit_desc spdk_vhost_resubmit_desc;
75 : typedef struct rte_vhost_resubmit_info spdk_vhost_resubmit_info;
76 : typedef struct rte_vhost_inflight_desc_packed spdk_vhost_inflight_desc;
77 :
78 : struct spdk_vhost_virtqueue {
79 : struct rte_vhost_vring vring;
80 : struct rte_vhost_ring_inflight vring_inflight;
81 : uint16_t last_avail_idx;
82 : uint16_t last_used_idx;
83 :
84 : struct {
85 : /* To mark a descriptor as available in packed ring
86 : * Equal to avail_wrap_counter in spec.
87 : */
88 : uint8_t avail_phase : 1;
89 : /* To mark a descriptor as used in packed ring
90 : * Equal to used_wrap_counter in spec.
91 : */
92 : uint8_t used_phase : 1;
93 : uint8_t padding : 5;
94 : bool packed_ring : 1;
95 : } packed;
96 :
97 : void *tasks;
98 :
99 : /* Request count from last stats check */
100 : uint32_t req_cnt;
101 :
102 : /* Request count from last event */
103 : uint16_t used_req_cnt;
104 :
105 : /* How long interrupt is delayed */
106 : uint32_t irq_delay_time;
107 :
108 : /* Next time when we need to send event */
109 : uint64_t next_event_time;
110 :
111 : /* Associated vhost_virtqueue in the virtio device's virtqueue list */
112 : uint32_t vring_idx;
113 :
114 : struct spdk_vhost_session *vsession;
115 :
116 : struct spdk_interrupt *intr;
117 : } __attribute((aligned(SPDK_CACHE_LINE_SIZE)));
118 :
119 : struct spdk_vhost_session {
120 : struct spdk_vhost_dev *vdev;
121 :
122 : /* rte_vhost connection ID. */
123 : int vid;
124 :
125 : /* Unique session ID. */
126 : uint64_t id;
127 : /* Unique session name. */
128 : char *name;
129 :
130 : bool started;
131 : bool starting;
132 : bool needs_restart;
133 :
134 : struct rte_vhost_memory *mem;
135 :
136 : int task_cnt;
137 :
138 : uint16_t max_queues;
139 : /* Maximum number of queues before restart, used with 'needs_restart' flag */
140 : uint16_t original_max_queues;
141 :
142 : uint64_t negotiated_features;
143 :
144 : /* Local copy of device coalescing settings. */
145 : uint32_t coalescing_delay_time_base;
146 : uint32_t coalescing_io_rate_threshold;
147 :
148 : /* Next time when stats for event coalescing will be checked. */
149 : uint64_t next_stats_check_time;
150 :
151 : /* Interval used for event coalescing checking. */
152 : uint64_t stats_check_interval;
153 :
154 : /* Session's stop poller will only try limited times to destroy the session. */
155 : uint32_t stop_retry_count;
156 :
157 : /**
158 : * DPDK calls our callbacks synchronously but the work those callbacks
159 : * perform needs to be async. Luckily, all DPDK callbacks are called on
160 : * a DPDK-internal pthread and only related to the current session, so we'll
161 : * just wait on a semaphore of this session in there.
162 : */
163 : sem_t dpdk_sem;
164 :
165 : /** Return code for the current DPDK callback */
166 : int dpdk_response;
167 :
168 : struct spdk_vhost_virtqueue virtqueue[SPDK_VHOST_MAX_VQUEUES];
169 :
170 : TAILQ_ENTRY(spdk_vhost_session) tailq;
171 : };
172 :
173 : struct spdk_vhost_user_dev {
174 : struct spdk_vhost_dev *vdev;
175 :
176 : const struct spdk_vhost_user_dev_backend *user_backend;
177 :
178 : /* Saved original values used to setup coalescing to avoid integer
179 : * rounding issues during save/load config.
180 : */
181 : uint32_t coalescing_delay_us;
182 : uint32_t coalescing_iops_threshold;
183 :
184 : bool registered;
185 :
186 : /* Use this lock to protect multiple sessions. */
187 : pthread_mutex_t lock;
188 :
189 : /* Current connections to the device */
190 : TAILQ_HEAD(, spdk_vhost_session) vsessions;
191 :
192 : /* Increment-only session counter */
193 : uint64_t vsessions_num;
194 :
195 : /* Number of pending asynchronous operations */
196 : uint32_t pending_async_op_num;
197 : };
198 :
199 : struct spdk_vhost_dev {
200 : char *name;
201 : char *path;
202 :
203 : bool use_default_cpumask;
204 : struct spdk_thread *thread;
205 :
206 : uint64_t virtio_features;
207 : uint64_t disabled_features;
208 : uint64_t protocol_features;
209 :
210 : const struct spdk_vhost_dev_backend *backend;
211 :
212 : /* Context passed from transport */
213 : void *ctxt;
214 :
215 : RB_ENTRY(spdk_vhost_dev) node;
216 : };
217 :
218 : static inline struct spdk_vhost_user_dev *
219 29 : to_user_dev(struct spdk_vhost_dev *vdev)
220 : {
221 29 : assert(vdev != NULL);
222 29 : return vdev->ctxt;
223 : }
224 :
225 : /**
226 : * \param vdev vhost device.
227 : * \param vsession vhost session.
228 : * \param arg user-provided parameter.
229 : *
230 : * \return negative values will break the foreach call, meaning
231 : * the function won't be called again. Return codes zero and
232 : * positive don't have any effect.
233 : */
234 : typedef int (*spdk_vhost_session_fn)(struct spdk_vhost_dev *vdev,
235 : struct spdk_vhost_session *vsession,
236 : void *arg);
237 :
238 : /**
239 : * \param vdev vhost device.
240 : * \param arg user-provided parameter.
241 : */
242 : typedef void (*spdk_vhost_dev_fn)(struct spdk_vhost_dev *vdev, void *arg);
243 :
244 : struct spdk_vhost_user_dev_backend {
245 : /**
246 : * Size of additional per-session context data
247 : * allocated whenever a new client connects.
248 : */
249 : size_t session_ctx_size;
250 :
251 : spdk_vhost_session_fn start_session;
252 : spdk_vhost_session_fn stop_session;
253 : int (*alloc_vq_tasks)(struct spdk_vhost_session *vsession, uint16_t qid);
254 : int (*enable_vq)(struct spdk_vhost_session *vsession, struct spdk_vhost_virtqueue *vq);
255 : };
256 :
257 : enum vhost_backend_type {
258 : VHOST_BACKEND_BLK = 0,
259 : VHOST_BACKEND_SCSI,
260 : };
261 :
262 : struct spdk_vhost_dev_backend {
263 : enum vhost_backend_type type;
264 :
265 : int (*vhost_get_config)(struct spdk_vhost_dev *vdev, uint8_t *config, uint32_t len);
266 : int (*vhost_set_config)(struct spdk_vhost_dev *vdev, uint8_t *config,
267 : uint32_t offset, uint32_t size, uint32_t flags);
268 :
269 : void (*dump_info_json)(struct spdk_vhost_dev *vdev, struct spdk_json_write_ctx *w);
270 : void (*write_config_json)(struct spdk_vhost_dev *vdev, struct spdk_json_write_ctx *w);
271 : int (*remove_device)(struct spdk_vhost_dev *vdev);
272 : int (*set_coalescing)(struct spdk_vhost_dev *vdev, uint32_t delay_base_us,
273 : uint32_t iops_threshold);
274 : void (*get_coalescing)(struct spdk_vhost_dev *vdev, uint32_t *delay_base_us,
275 : uint32_t *iops_threshold);
276 : };
277 :
278 : void *vhost_gpa_to_vva(struct spdk_vhost_session *vsession, uint64_t addr, uint64_t len);
279 :
280 : uint16_t vhost_vq_avail_ring_get(struct spdk_vhost_virtqueue *vq, uint16_t *reqs,
281 : uint16_t reqs_len);
282 :
283 : /**
284 : * Get a virtio split descriptor at given index in given virtqueue.
285 : * The descriptor will provide access to the entire descriptor
286 : * chain. The subsequent descriptors are accessible via
287 : * \c spdk_vhost_vring_desc_get_next.
288 : * \param vsession vhost session
289 : * \param vq virtqueue
290 : * \param req_idx descriptor index
291 : * \param desc pointer to be set to the descriptor
292 : * \param desc_table descriptor table to be used with
293 : * \c spdk_vhost_vring_desc_get_next. This might be either
294 : * default virtqueue descriptor table or per-chain indirect
295 : * table.
296 : * \param desc_table_size size of the *desc_table*
297 : * \return 0 on success, -1 if given index is invalid.
298 : * If -1 is returned, the content of params is undefined.
299 : */
300 : int vhost_vq_get_desc(struct spdk_vhost_session *vsession, struct spdk_vhost_virtqueue *vq,
301 : uint16_t req_idx, struct vring_desc **desc, struct vring_desc **desc_table,
302 : uint32_t *desc_table_size);
303 :
304 : /**
305 : * Get a virtio packed descriptor at given index in given virtqueue.
306 : * The descriptor will provide access to the entire descriptor
307 : * chain. The subsequent descriptors are accessible via
308 : * \c vhost_vring_packed_desc_get_next.
309 : * \param vsession vhost session
310 : * \param vq virtqueue
311 : * \param req_idx descriptor index
312 : * \param desc pointer to be set to the descriptor
313 : * \param desc_table descriptor table to be used with
314 : * \c spdk_vhost_vring_desc_get_next. This might be either
315 : * \c NULL or per-chain indirect table.
316 : * \param desc_table_size size of the *desc_table*
317 : * \return 0 on success, -1 if given index is invalid.
318 : * If -1 is returned, the content of params is undefined.
319 : */
320 : int vhost_vq_get_desc_packed(struct spdk_vhost_session *vsession,
321 : struct spdk_vhost_virtqueue *virtqueue,
322 : uint16_t req_idx, struct vring_packed_desc **desc,
323 : struct vring_packed_desc **desc_table, uint32_t *desc_table_size);
324 :
325 : int vhost_inflight_queue_get_desc(struct spdk_vhost_session *vsession,
326 : spdk_vhost_inflight_desc *desc_array,
327 : uint16_t req_idx, spdk_vhost_inflight_desc **desc,
328 : struct vring_packed_desc **desc_table, uint32_t *desc_table_size);
329 :
330 : /**
331 : * Send IRQ/call client (if pending) for \c vq.
332 : * \param vsession vhost session
333 : * \param vq virtqueue
334 : * \return
335 : * 0 - if no interrupt was signalled
336 : * 1 - if interrupt was signalled
337 : */
338 : int vhost_vq_used_signal(struct spdk_vhost_session *vsession, struct spdk_vhost_virtqueue *vq);
339 :
340 : /**
341 : * Send IRQs for the queue that need to be signaled.
342 : * \param vq virtqueue
343 : */
344 : void vhost_session_vq_used_signal(struct spdk_vhost_virtqueue *virtqueue);
345 :
346 : void vhost_vq_used_ring_enqueue(struct spdk_vhost_session *vsession,
347 : struct spdk_vhost_virtqueue *vq,
348 : uint16_t id, uint32_t len);
349 :
350 : /**
351 : * Enqueue the entry to the used ring when device complete the request.
352 : * \param vsession vhost session
353 : * \param vq virtqueue
354 : * \req_idx descriptor index. It's the first index of this descriptor chain.
355 : * \num_descs descriptor count. It's the count of the number of buffers in the chain.
356 : * \buffer_id descriptor buffer ID.
357 : * \length device write length. Specify the length of the buffer that has been initialized
358 : * (written to) by the device
359 : * \inflight_head the head idx of this IO inflight desc chain.
360 : */
361 : void vhost_vq_packed_ring_enqueue(struct spdk_vhost_session *vsession,
362 : struct spdk_vhost_virtqueue *virtqueue,
363 : uint16_t num_descs, uint16_t buffer_id,
364 : uint32_t length, uint16_t inflight_head);
365 :
366 : /**
367 : * Get subsequent descriptor from given table.
368 : * \param desc current descriptor, will be set to the
369 : * next descriptor (NULL in case this is the last
370 : * descriptor in the chain or the next desc is invalid)
371 : * \param desc_table descriptor table
372 : * \param desc_table_size size of the *desc_table*
373 : * \return 0 on success, -1 if given index is invalid
374 : * The *desc* param will be set regardless of the
375 : * return value.
376 : */
377 : int vhost_vring_desc_get_next(struct vring_desc **desc,
378 : struct vring_desc *desc_table, uint32_t desc_table_size);
379 : static inline bool
380 0 : vhost_vring_desc_is_wr(struct vring_desc *cur_desc)
381 : {
382 0 : return !!(cur_desc->flags & VRING_DESC_F_WRITE);
383 : }
384 :
385 : int vhost_vring_desc_to_iov(struct spdk_vhost_session *vsession, struct iovec *iov,
386 : uint16_t *iov_index, const struct vring_desc *desc);
387 :
388 : bool vhost_vq_packed_ring_is_avail(struct spdk_vhost_virtqueue *virtqueue);
389 :
390 : /**
391 : * Get subsequent descriptor from vq or desc table.
392 : * \param desc current descriptor, will be set to the
393 : * next descriptor (NULL in case this is the last
394 : * descriptor in the chain or the next desc is invalid)
395 : * \req_idx index of current desc, will be set to the next
396 : * index. If desc_table != NULL the req_idx is the the vring index
397 : * or the req_idx is the desc_table index.
398 : * \param desc_table descriptor table
399 : * \param desc_table_size size of the *desc_table*
400 : * \return 0 on success, -1 if given index is invalid
401 : * The *desc* param will be set regardless of the
402 : * return value.
403 : */
404 : int vhost_vring_packed_desc_get_next(struct vring_packed_desc **desc, uint16_t *req_idx,
405 : struct spdk_vhost_virtqueue *vq,
406 : struct vring_packed_desc *desc_table,
407 : uint32_t desc_table_size);
408 :
409 : bool vhost_vring_packed_desc_is_wr(struct vring_packed_desc *cur_desc);
410 :
411 : int vhost_vring_packed_desc_to_iov(struct spdk_vhost_session *vsession, struct iovec *iov,
412 : uint16_t *iov_index, const struct vring_packed_desc *desc);
413 :
414 : bool vhost_vring_inflight_desc_is_wr(spdk_vhost_inflight_desc *cur_desc);
415 :
416 : int vhost_vring_inflight_desc_to_iov(struct spdk_vhost_session *vsession, struct iovec *iov,
417 : uint16_t *iov_index, const spdk_vhost_inflight_desc *desc);
418 :
419 : uint16_t vhost_vring_packed_desc_get_buffer_id(struct spdk_vhost_virtqueue *vq, uint16_t req_idx,
420 : uint16_t *num_descs);
421 :
422 : static inline bool
423 : __attribute__((always_inline))
424 7 : vhost_dev_has_feature(struct spdk_vhost_session *vsession, unsigned feature_id)
425 : {
426 7 : return vsession->negotiated_features & (1ULL << feature_id);
427 : }
428 :
429 : int vhost_scsi_controller_start(const char *name);
430 :
431 : int vhost_dev_register(struct spdk_vhost_dev *vdev, const char *name, const char *mask_str,
432 : const struct spdk_json_val *params, const struct spdk_vhost_dev_backend *backend,
433 : const struct spdk_vhost_user_dev_backend *user_backend, bool delay);
434 :
435 : int vhost_dev_unregister(struct spdk_vhost_dev *vdev);
436 :
437 : void vhost_dump_info_json(struct spdk_vhost_dev *vdev, struct spdk_json_write_ctx *w);
438 :
439 : /*
440 : * Set vhost session to run in interrupt or poll mode
441 : */
442 : void vhost_user_session_set_interrupt_mode(struct spdk_vhost_session *vsession,
443 : bool interrupt_mode);
444 :
445 : /*
446 : * Memory registration functions used in start/stop device callbacks
447 : */
448 : void vhost_session_mem_register(struct rte_vhost_memory *mem);
449 : void vhost_session_mem_unregister(struct rte_vhost_memory *mem);
450 :
451 : /*
452 : * Call a function for each session of the provided vhost device.
453 : * The function will be called one-by-one on each session's thread.
454 : *
455 : * \param vdev vhost device
456 : * \param fn function to call on each session's thread
457 : * \param cpl_fn function to be called at the end of the iteration on
458 : * the vhost management thread.
459 : * Optional, can be NULL.
460 : * \param arg additional argument to the both callbacks
461 : */
462 : void vhost_user_dev_foreach_session(struct spdk_vhost_dev *dev,
463 : spdk_vhost_session_fn fn,
464 : spdk_vhost_dev_fn cpl_fn,
465 : void *arg);
466 :
467 : /**
468 : * Finish a blocking vhost_user_wait_for_session_stop() call and finally
469 : * stop the session. This must be called on the session's lcore which
470 : * used to receive all session-related messages (e.g. from
471 : * vhost_user_dev_foreach_session()). After this call, the session-
472 : * related messages will be once again processed by any arbitrary thread.
473 : *
474 : * Must be called under the vhost user device's session access lock.
475 : *
476 : * \param vsession vhost session
477 : * \param response return code
478 : */
479 : void vhost_user_session_stop_done(struct spdk_vhost_session *vsession, int response);
480 :
481 : struct spdk_vhost_session *vhost_session_find_by_vid(int vid);
482 : void vhost_session_install_rte_compat_hooks(struct spdk_vhost_session *vsession);
483 : int vhost_register_unix_socket(const char *path, const char *ctrl_name,
484 : uint64_t virtio_features, uint64_t disabled_features, uint64_t protocol_features);
485 : int vhost_driver_unregister(const char *path);
486 : int vhost_get_mem_table(int vid, struct rte_vhost_memory **mem);
487 : int vhost_get_negotiated_features(int vid, uint64_t *negotiated_features);
488 :
489 : int remove_vhost_controller(struct spdk_vhost_dev *vdev);
490 :
491 : struct spdk_io_channel *vhost_blk_get_io_channel(struct spdk_vhost_dev *vdev);
492 : void vhost_blk_put_io_channel(struct spdk_io_channel *ch);
493 :
494 : /* The spdk_bdev pointer should only be used to retrieve
495 : * the device properties, ex. number of blocks or I/O type supported. */
496 : struct spdk_bdev *vhost_blk_get_bdev(struct spdk_vhost_dev *vdev);
497 :
498 : /* Function calls from vhost.c to rte_vhost_user.c,
499 : * shall removed once virtio transport abstraction is complete. */
500 : int vhost_user_session_set_coalescing(struct spdk_vhost_dev *dev,
501 : struct spdk_vhost_session *vsession, void *ctx);
502 : int vhost_user_dev_set_coalescing(struct spdk_vhost_user_dev *user_dev, uint32_t delay_base_us,
503 : uint32_t iops_threshold);
504 : int vhost_user_dev_create(struct spdk_vhost_dev *vdev, const char *name,
505 : struct spdk_cpuset *cpumask,
506 : const struct spdk_vhost_user_dev_backend *user_backend, bool dealy);
507 : int vhost_user_dev_init(struct spdk_vhost_dev *vdev, const char *name,
508 : struct spdk_cpuset *cpumask, const struct spdk_vhost_user_dev_backend *user_backend);
509 : int vhost_user_dev_start(struct spdk_vhost_dev *vdev);
510 : int vhost_user_dev_unregister(struct spdk_vhost_dev *vdev);
511 : int vhost_user_init(void);
512 : void vhost_user_fini(spdk_vhost_fini_cb vhost_cb);
513 : int vhost_user_set_coalescing(struct spdk_vhost_dev *vdev, uint32_t delay_base_us,
514 : uint32_t iops_threshold);
515 : void vhost_user_get_coalescing(struct spdk_vhost_dev *vdev, uint32_t *delay_base_us,
516 : uint32_t *iops_threshold);
517 :
518 : int virtio_blk_construct_ctrlr(struct spdk_vhost_dev *vdev, const char *address,
519 : struct spdk_cpuset *cpumask, const struct spdk_json_val *params,
520 : const struct spdk_vhost_user_dev_backend *user_backend);
521 : int virtio_blk_destroy_ctrlr(struct spdk_vhost_dev *vdev);
522 :
523 : struct spdk_vhost_blk_task;
524 :
525 : typedef void (*virtio_blk_request_cb)(uint8_t status, struct spdk_vhost_blk_task *task,
526 : void *cb_arg);
527 :
528 : struct spdk_vhost_blk_task {
529 : struct spdk_bdev_io *bdev_io;
530 : virtio_blk_request_cb cb;
531 : void *cb_arg;
532 :
533 : volatile uint8_t *status;
534 :
535 : /* for io wait */
536 : struct spdk_bdev_io_wait_entry bdev_io_wait;
537 : struct spdk_io_channel *bdev_io_wait_ch;
538 : struct spdk_vhost_dev *bdev_io_wait_vdev;
539 :
540 : /** Number of bytes that were written. */
541 : uint32_t used_len;
542 : uint16_t iovcnt;
543 : struct iovec iovs[SPDK_VHOST_IOVS_MAX];
544 :
545 : /** Size of whole payload in bytes */
546 : uint32_t payload_size;
547 : };
548 :
549 : int virtio_blk_process_request(struct spdk_vhost_dev *vdev, struct spdk_io_channel *ch,
550 : struct spdk_vhost_blk_task *task, virtio_blk_request_cb cb, void *cb_arg);
551 :
552 : typedef void (*bdev_event_cb_complete)(struct spdk_vhost_dev *vdev, void *ctx);
553 :
554 : #define SPDK_VIRTIO_BLK_TRSTRING_MAX_LEN 32
555 :
556 : struct spdk_virtio_blk_transport_ops {
557 : /**
558 : * Transport name
559 : */
560 : char name[SPDK_VIRTIO_BLK_TRSTRING_MAX_LEN];
561 :
562 : /**
563 : * Create a transport for the given transport opts
564 : */
565 : struct spdk_virtio_blk_transport *(*create)(const struct spdk_json_val *params);
566 :
567 : /**
568 : * Dump transport-specific opts into JSON
569 : */
570 : void (*dump_opts)(struct spdk_virtio_blk_transport *transport, struct spdk_json_write_ctx *w);
571 :
572 : /**
573 : * Destroy the transport
574 : */
575 : int (*destroy)(struct spdk_virtio_blk_transport *transport,
576 : spdk_vhost_fini_cb cb_fn);
577 :
578 : /**
579 : * Create vhost block controller
580 : */
581 : int (*create_ctrlr)(struct spdk_vhost_dev *vdev, struct spdk_cpuset *cpumask,
582 : const char *address, const struct spdk_json_val *params,
583 : void *custom_opts);
584 :
585 : /**
586 : * Destroy vhost block controller
587 : */
588 : int (*destroy_ctrlr)(struct spdk_vhost_dev *vdev);
589 :
590 : /*
591 : * Signal removal of the bdev.
592 : */
593 : void (*bdev_event)(enum spdk_bdev_event_type type, struct spdk_vhost_dev *vdev,
594 : bdev_event_cb_complete cb, void *cb_arg);
595 :
596 : /**
597 : * Set coalescing parameters.
598 : */
599 : int (*set_coalescing)(struct spdk_vhost_dev *vdev, uint32_t delay_base_us,
600 : uint32_t iops_threshold);
601 :
602 : /**
603 : * Get coalescing parameters.
604 : */
605 : void (*get_coalescing)(struct spdk_vhost_dev *vdev, uint32_t *delay_base_us,
606 : uint32_t *iops_threshold);
607 : };
608 :
609 : struct spdk_virtio_blk_transport {
610 : const struct spdk_virtio_blk_transport_ops *ops;
611 : TAILQ_ENTRY(spdk_virtio_blk_transport) tailq;
612 : };
613 :
614 : struct virtio_blk_transport_ops_list_element {
615 : struct spdk_virtio_blk_transport_ops ops;
616 : TAILQ_ENTRY(virtio_blk_transport_ops_list_element) link;
617 : };
618 :
619 : void virtio_blk_transport_register(const struct spdk_virtio_blk_transport_ops *ops);
620 : int virtio_blk_transport_create(const char *transport_name, const struct spdk_json_val *params);
621 : int virtio_blk_transport_destroy(struct spdk_virtio_blk_transport *transport,
622 : spdk_vhost_fini_cb cb_fn);
623 : struct spdk_virtio_blk_transport *virtio_blk_transport_get_first(void);
624 : struct spdk_virtio_blk_transport *virtio_blk_transport_get_next(
625 : struct spdk_virtio_blk_transport *transport);
626 : void virtio_blk_transport_dump_opts(struct spdk_virtio_blk_transport *transport,
627 : struct spdk_json_write_ctx *w);
628 : struct spdk_virtio_blk_transport *virtio_blk_tgt_get_transport(const char *transport_name);
629 : const struct spdk_virtio_blk_transport_ops *virtio_blk_get_transport_ops(
630 : const char *transport_name);
631 :
632 : void vhost_session_info_json(struct spdk_vhost_dev *vdev, struct spdk_json_write_ctx *w);
633 :
634 : /*
635 : * Macro used to register new transports.
636 : */
637 : #define SPDK_VIRTIO_BLK_TRANSPORT_REGISTER(name, transport_ops) \
638 : static void __attribute__((constructor)) _virtio_blk_transport_register_##name(void) \
639 : { \
640 : virtio_blk_transport_register(transport_ops); \
641 : }
642 :
643 : #endif /* SPDK_VHOST_INTERNAL_H */
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