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