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 bool needs_restart; 120 121 struct rte_vhost_memory *mem; 122 123 int task_cnt; 124 125 uint16_t max_queues; 126 /* Maximum number of queues before restart, used with 'needs_restart' flag */ 127 uint16_t original_max_queues; 128 129 uint64_t negotiated_features; 130 131 /* Local copy of device coalescing settings. */ 132 uint32_t coalescing_delay_time_base; 133 uint32_t coalescing_io_rate_threshold; 134 135 /* Next time when stats for event coalescing will be checked. */ 136 uint64_t next_stats_check_time; 137 138 /* Interval used for event coalescing checking. */ 139 uint64_t stats_check_interval; 140 141 /* Session's stop poller will only try limited times to destroy the session. */ 142 uint32_t stop_retry_count; 143 144 struct spdk_vhost_virtqueue virtqueue[SPDK_VHOST_MAX_VQUEUES]; 145 146 TAILQ_ENTRY(spdk_vhost_session) tailq; 147 }; 148 149 struct spdk_vhost_user_dev { 150 struct spdk_vhost_dev *vdev; 151 152 const struct spdk_vhost_user_dev_backend *user_backend; 153 154 /* Saved original values used to setup coalescing to avoid integer 155 * rounding issues during save/load config. 156 */ 157 uint32_t coalescing_delay_us; 158 uint32_t coalescing_iops_threshold; 159 160 bool registered; 161 162 /* Use this lock to protect multiple sessions. */ 163 pthread_mutex_t lock; 164 165 /* Current connections to the device */ 166 TAILQ_HEAD(, spdk_vhost_session) vsessions; 167 168 /* Increment-only session counter */ 169 uint64_t vsessions_num; 170 171 /* Number of pending asynchronous operations */ 172 uint32_t pending_async_op_num; 173 }; 174 175 struct spdk_vhost_dev { 176 char *name; 177 char *path; 178 179 struct spdk_thread *thread; 180 181 uint64_t virtio_features; 182 uint64_t disabled_features; 183 uint64_t protocol_features; 184 185 const struct spdk_vhost_dev_backend *backend; 186 187 /* Context passed from transport */ 188 void *ctxt; 189 190 TAILQ_ENTRY(spdk_vhost_dev) tailq; 191 }; 192 193 static inline struct spdk_vhost_user_dev * 194 to_user_dev(struct spdk_vhost_dev *vdev) 195 { 196 assert(vdev != NULL); 197 return vdev->ctxt; 198 } 199 200 /** 201 * \param vdev vhost device. 202 * \param vsession vhost session. 203 * \param arg user-provided parameter. 204 * 205 * \return negative values will break the foreach call, meaning 206 * the function won't be called again. Return codes zero and 207 * positive don't have any effect. 208 */ 209 typedef int (*spdk_vhost_session_fn)(struct spdk_vhost_dev *vdev, 210 struct spdk_vhost_session *vsession, 211 void *arg); 212 213 /** 214 * \param vdev vhost device. 215 * \param arg user-provided parameter. 216 */ 217 typedef void (*spdk_vhost_dev_fn)(struct spdk_vhost_dev *vdev, void *arg); 218 219 struct spdk_vhost_user_dev_backend { 220 /** 221 * Size of additional per-session context data 222 * allocated whenever a new client connects. 223 */ 224 size_t session_ctx_size; 225 226 spdk_vhost_session_fn start_session; 227 spdk_vhost_session_fn stop_session; 228 int (*alloc_vq_tasks)(struct spdk_vhost_session *vsession, uint16_t qid); 229 void (*register_vq_interrupt)(struct spdk_vhost_session *vsession, struct spdk_vhost_virtqueue *vq); 230 }; 231 232 enum vhost_backend_type { 233 VHOST_BACKEND_BLK = 0, 234 VHOST_BACKEND_SCSI, 235 }; 236 237 struct spdk_vhost_dev_backend { 238 enum vhost_backend_type type; 239 240 int (*vhost_get_config)(struct spdk_vhost_dev *vdev, uint8_t *config, uint32_t len); 241 int (*vhost_set_config)(struct spdk_vhost_dev *vdev, uint8_t *config, 242 uint32_t offset, uint32_t size, uint32_t flags); 243 244 void (*dump_info_json)(struct spdk_vhost_dev *vdev, struct spdk_json_write_ctx *w); 245 void (*write_config_json)(struct spdk_vhost_dev *vdev, struct spdk_json_write_ctx *w); 246 int (*remove_device)(struct spdk_vhost_dev *vdev); 247 int (*set_coalescing)(struct spdk_vhost_dev *vdev, uint32_t delay_base_us, 248 uint32_t iops_threshold); 249 void (*get_coalescing)(struct spdk_vhost_dev *vdev, uint32_t *delay_base_us, 250 uint32_t *iops_threshold); 251 }; 252 253 void *vhost_gpa_to_vva(struct spdk_vhost_session *vsession, uint64_t addr, uint64_t len); 254 255 uint16_t vhost_vq_avail_ring_get(struct spdk_vhost_virtqueue *vq, uint16_t *reqs, 256 uint16_t reqs_len); 257 258 /** 259 * Get a virtio split descriptor at given index in given virtqueue. 260 * The descriptor will provide access to the entire descriptor 261 * chain. The subsequent descriptors are accessible via 262 * \c spdk_vhost_vring_desc_get_next. 263 * \param vsession vhost session 264 * \param vq virtqueue 265 * \param req_idx descriptor index 266 * \param desc pointer to be set to the descriptor 267 * \param desc_table descriptor table to be used with 268 * \c spdk_vhost_vring_desc_get_next. This might be either 269 * default virtqueue descriptor table or per-chain indirect 270 * table. 271 * \param desc_table_size size of the *desc_table* 272 * \return 0 on success, -1 if given index is invalid. 273 * If -1 is returned, the content of params is undefined. 274 */ 275 int vhost_vq_get_desc(struct spdk_vhost_session *vsession, struct spdk_vhost_virtqueue *vq, 276 uint16_t req_idx, struct vring_desc **desc, struct vring_desc **desc_table, 277 uint32_t *desc_table_size); 278 279 /** 280 * Get a virtio packed descriptor at given index in given virtqueue. 281 * The descriptor will provide access to the entire descriptor 282 * chain. The subsequent descriptors are accessible via 283 * \c vhost_vring_packed_desc_get_next. 284 * \param vsession vhost session 285 * \param vq virtqueue 286 * \param req_idx descriptor index 287 * \param desc pointer to be set to the descriptor 288 * \param desc_table descriptor table to be used with 289 * \c spdk_vhost_vring_desc_get_next. This might be either 290 * \c NULL or per-chain indirect table. 291 * \param desc_table_size size of the *desc_table* 292 * \return 0 on success, -1 if given index is invalid. 293 * If -1 is returned, the content of params is undefined. 294 */ 295 int vhost_vq_get_desc_packed(struct spdk_vhost_session *vsession, 296 struct spdk_vhost_virtqueue *virtqueue, 297 uint16_t req_idx, struct vring_packed_desc **desc, 298 struct vring_packed_desc **desc_table, uint32_t *desc_table_size); 299 300 int vhost_inflight_queue_get_desc(struct spdk_vhost_session *vsession, 301 spdk_vhost_inflight_desc *desc_array, 302 uint16_t req_idx, spdk_vhost_inflight_desc **desc, 303 struct vring_packed_desc **desc_table, uint32_t *desc_table_size); 304 305 /** 306 * Send IRQ/call client (if pending) for \c vq. 307 * \param vsession vhost session 308 * \param vq virtqueue 309 * \return 310 * 0 - if no interrupt was signalled 311 * 1 - if interrupt was signalled 312 */ 313 int vhost_vq_used_signal(struct spdk_vhost_session *vsession, struct spdk_vhost_virtqueue *vq); 314 315 /** 316 * Send IRQs for the queue that need to be signaled. 317 * \param vq virtqueue 318 */ 319 void vhost_session_vq_used_signal(struct spdk_vhost_virtqueue *virtqueue); 320 321 void vhost_vq_used_ring_enqueue(struct spdk_vhost_session *vsession, 322 struct spdk_vhost_virtqueue *vq, 323 uint16_t id, uint32_t len); 324 325 /** 326 * Enqueue the entry to the used ring when device complete the request. 327 * \param vsession vhost session 328 * \param vq virtqueue 329 * \req_idx descriptor index. It's the first index of this descriptor chain. 330 * \num_descs descriptor count. It's the count of the number of buffers in the chain. 331 * \buffer_id descriptor buffer ID. 332 * \length device write length. Specify the length of the buffer that has been initialized 333 * (written to) by the device 334 * \inflight_head the head idx of this IO inflight desc chain. 335 */ 336 void vhost_vq_packed_ring_enqueue(struct spdk_vhost_session *vsession, 337 struct spdk_vhost_virtqueue *virtqueue, 338 uint16_t num_descs, uint16_t buffer_id, 339 uint32_t length, uint16_t inflight_head); 340 341 /** 342 * Get subsequent descriptor from given table. 343 * \param desc current descriptor, will be set to the 344 * next descriptor (NULL in case this is the last 345 * descriptor in the chain or the next desc is invalid) 346 * \param desc_table descriptor table 347 * \param desc_table_size size of the *desc_table* 348 * \return 0 on success, -1 if given index is invalid 349 * The *desc* param will be set regardless of the 350 * return value. 351 */ 352 int vhost_vring_desc_get_next(struct vring_desc **desc, 353 struct vring_desc *desc_table, uint32_t desc_table_size); 354 static inline bool 355 vhost_vring_desc_is_wr(struct vring_desc *cur_desc) 356 { 357 return !!(cur_desc->flags & VRING_DESC_F_WRITE); 358 } 359 360 int vhost_vring_desc_to_iov(struct spdk_vhost_session *vsession, struct iovec *iov, 361 uint16_t *iov_index, const struct vring_desc *desc); 362 363 bool vhost_vq_packed_ring_is_avail(struct spdk_vhost_virtqueue *virtqueue); 364 365 /** 366 * Get subsequent descriptor from vq or desc table. 367 * \param desc current descriptor, will be set to the 368 * next descriptor (NULL in case this is the last 369 * descriptor in the chain or the next desc is invalid) 370 * \req_idx index of current desc, will be set to the next 371 * index. If desc_table != NULL the req_idx is the the vring index 372 * or the req_idx is the desc_table index. 373 * \param desc_table descriptor table 374 * \param desc_table_size size of the *desc_table* 375 * \return 0 on success, -1 if given index is invalid 376 * The *desc* param will be set regardless of the 377 * return value. 378 */ 379 int vhost_vring_packed_desc_get_next(struct vring_packed_desc **desc, uint16_t *req_idx, 380 struct spdk_vhost_virtqueue *vq, 381 struct vring_packed_desc *desc_table, 382 uint32_t desc_table_size); 383 384 bool vhost_vring_packed_desc_is_wr(struct vring_packed_desc *cur_desc); 385 386 int vhost_vring_packed_desc_to_iov(struct spdk_vhost_session *vsession, struct iovec *iov, 387 uint16_t *iov_index, const struct vring_packed_desc *desc); 388 389 bool vhost_vring_inflight_desc_is_wr(spdk_vhost_inflight_desc *cur_desc); 390 391 int vhost_vring_inflight_desc_to_iov(struct spdk_vhost_session *vsession, struct iovec *iov, 392 uint16_t *iov_index, const spdk_vhost_inflight_desc *desc); 393 394 uint16_t vhost_vring_packed_desc_get_buffer_id(struct spdk_vhost_virtqueue *vq, uint16_t req_idx, 395 uint16_t *num_descs); 396 397 static inline bool 398 __attribute__((always_inline)) 399 vhost_dev_has_feature(struct spdk_vhost_session *vsession, unsigned feature_id) 400 { 401 return vsession->negotiated_features & (1ULL << feature_id); 402 } 403 404 int vhost_dev_register(struct spdk_vhost_dev *vdev, const char *name, const char *mask_str, 405 const struct spdk_json_val *params, 406 const struct spdk_vhost_dev_backend *backend, 407 const struct spdk_vhost_user_dev_backend *user_backend); 408 int vhost_dev_unregister(struct spdk_vhost_dev *vdev); 409 410 void vhost_dump_info_json(struct spdk_vhost_dev *vdev, struct spdk_json_write_ctx *w); 411 412 /* 413 * Set vhost session to run in interrupt or poll mode 414 */ 415 void vhost_user_session_set_interrupt_mode(struct spdk_vhost_session *vsession, 416 bool interrupt_mode); 417 418 /* 419 * Memory registration functions used in start/stop device callbacks 420 */ 421 void vhost_session_mem_register(struct rte_vhost_memory *mem); 422 void vhost_session_mem_unregister(struct rte_vhost_memory *mem); 423 424 /* 425 * Call a function for each session of the provided vhost device. 426 * The function will be called one-by-one on each session's thread. 427 * 428 * \param vdev vhost device 429 * \param fn function to call on each session's thread 430 * \param cpl_fn function to be called at the end of the iteration on 431 * the vhost management thread. 432 * Optional, can be NULL. 433 * \param arg additional argument to the both callbacks 434 */ 435 void vhost_user_dev_foreach_session(struct spdk_vhost_dev *dev, 436 spdk_vhost_session_fn fn, 437 spdk_vhost_dev_fn cpl_fn, 438 void *arg); 439 440 /** 441 * Finish a blocking vhost_user_wait_for_session_stop() call and finally 442 * stop the session. This must be called on the session's lcore which 443 * used to receive all session-related messages (e.g. from 444 * vhost_user_dev_foreach_session()). After this call, the session- 445 * related messages will be once again processed by any arbitrary thread. 446 * 447 * Must be called under the vhost user device's session access lock. 448 * 449 * \param vsession vhost session 450 * \param response return code 451 */ 452 void vhost_user_session_stop_done(struct spdk_vhost_session *vsession, int response); 453 454 struct spdk_vhost_session *vhost_session_find_by_vid(int vid); 455 void vhost_session_install_rte_compat_hooks(struct spdk_vhost_session *vsession); 456 int vhost_register_unix_socket(const char *path, const char *ctrl_name, 457 uint64_t virtio_features, uint64_t disabled_features, uint64_t protocol_features); 458 int vhost_driver_unregister(const char *path); 459 int vhost_get_mem_table(int vid, struct rte_vhost_memory **mem); 460 int vhost_get_negotiated_features(int vid, uint64_t *negotiated_features); 461 462 int remove_vhost_controller(struct spdk_vhost_dev *vdev); 463 464 struct spdk_io_channel *vhost_blk_get_io_channel(struct spdk_vhost_dev *vdev); 465 void vhost_blk_put_io_channel(struct spdk_io_channel *ch); 466 467 /* The spdk_bdev pointer should only be used to retrieve 468 * the device properties, ex. number of blocks or I/O type supported. */ 469 struct spdk_bdev *vhost_blk_get_bdev(struct spdk_vhost_dev *vdev); 470 471 /* Function calls from vhost.c to rte_vhost_user.c, 472 * shall removed once virtio transport abstraction is complete. */ 473 int vhost_user_session_set_coalescing(struct spdk_vhost_dev *dev, 474 struct spdk_vhost_session *vsession, void *ctx); 475 int vhost_user_dev_set_coalescing(struct spdk_vhost_user_dev *user_dev, uint32_t delay_base_us, 476 uint32_t iops_threshold); 477 int vhost_user_dev_register(struct spdk_vhost_dev *vdev, const char *name, 478 struct spdk_cpuset *cpumask, const struct spdk_vhost_user_dev_backend *user_backend); 479 int vhost_user_dev_unregister(struct spdk_vhost_dev *vdev); 480 int vhost_user_init(void); 481 void vhost_user_fini(spdk_vhost_fini_cb vhost_cb); 482 int vhost_user_set_coalescing(struct spdk_vhost_dev *vdev, uint32_t delay_base_us, 483 uint32_t iops_threshold); 484 void vhost_user_get_coalescing(struct spdk_vhost_dev *vdev, uint32_t *delay_base_us, 485 uint32_t *iops_threshold); 486 487 int virtio_blk_construct_ctrlr(struct spdk_vhost_dev *vdev, const char *address, 488 struct spdk_cpuset *cpumask, const struct spdk_json_val *params, 489 const struct spdk_vhost_user_dev_backend *user_backend); 490 int virtio_blk_destroy_ctrlr(struct spdk_vhost_dev *vdev); 491 492 struct spdk_vhost_blk_task; 493 494 typedef void (*virtio_blk_request_cb)(uint8_t status, struct spdk_vhost_blk_task *task, 495 void *cb_arg); 496 497 struct spdk_vhost_blk_task { 498 struct spdk_bdev_io *bdev_io; 499 virtio_blk_request_cb cb; 500 void *cb_arg; 501 502 volatile uint8_t *status; 503 504 /* for io wait */ 505 struct spdk_bdev_io_wait_entry bdev_io_wait; 506 struct spdk_io_channel *bdev_io_wait_ch; 507 struct spdk_vhost_dev *bdev_io_wait_vdev; 508 509 /** Number of bytes that were written. */ 510 uint32_t used_len; 511 uint16_t iovcnt; 512 struct iovec iovs[SPDK_VHOST_IOVS_MAX]; 513 514 /** Size of whole payload in bytes */ 515 uint32_t payload_size; 516 }; 517 518 int virtio_blk_process_request(struct spdk_vhost_dev *vdev, struct spdk_io_channel *ch, 519 struct spdk_vhost_blk_task *task, virtio_blk_request_cb cb, void *cb_arg); 520 521 typedef void (*bdev_event_cb_complete)(struct spdk_vhost_dev *vdev, void *ctx); 522 523 #define SPDK_VIRTIO_BLK_TRSTRING_MAX_LEN 32 524 525 struct spdk_virtio_blk_transport_ops { 526 /** 527 * Transport name 528 */ 529 char name[SPDK_VIRTIO_BLK_TRSTRING_MAX_LEN]; 530 531 /** 532 * Create a transport for the given transport opts 533 */ 534 struct spdk_virtio_blk_transport *(*create)(const struct spdk_json_val *params); 535 536 /** 537 * Dump transport-specific opts into JSON 538 */ 539 void (*dump_opts)(struct spdk_virtio_blk_transport *transport, struct spdk_json_write_ctx *w); 540 541 /** 542 * Destroy the transport 543 */ 544 int (*destroy)(struct spdk_virtio_blk_transport *transport, 545 spdk_vhost_fini_cb cb_fn); 546 547 /** 548 * Create vhost block controller 549 */ 550 int (*create_ctrlr)(struct spdk_vhost_dev *vdev, struct spdk_cpuset *cpumask, 551 const char *address, const struct spdk_json_val *params, 552 void *custom_opts); 553 554 /** 555 * Destroy vhost block controller 556 */ 557 int (*destroy_ctrlr)(struct spdk_vhost_dev *vdev); 558 559 /* 560 * Signal removal of the bdev. 561 */ 562 void (*bdev_event)(enum spdk_bdev_event_type type, struct spdk_vhost_dev *vdev, 563 bdev_event_cb_complete cb, void *cb_arg); 564 565 /** 566 * Set coalescing parameters. 567 */ 568 int (*set_coalescing)(struct spdk_vhost_dev *vdev, uint32_t delay_base_us, 569 uint32_t iops_threshold); 570 571 /** 572 * Get coalescing parameters. 573 */ 574 void (*get_coalescing)(struct spdk_vhost_dev *vdev, uint32_t *delay_base_us, 575 uint32_t *iops_threshold); 576 }; 577 578 struct spdk_virtio_blk_transport { 579 const struct spdk_virtio_blk_transport_ops *ops; 580 TAILQ_ENTRY(spdk_virtio_blk_transport) tailq; 581 }; 582 583 struct virtio_blk_transport_ops_list_element { 584 struct spdk_virtio_blk_transport_ops ops; 585 TAILQ_ENTRY(virtio_blk_transport_ops_list_element) link; 586 }; 587 588 void virtio_blk_transport_register(const struct spdk_virtio_blk_transport_ops *ops); 589 int virtio_blk_transport_create(const char *transport_name, const struct spdk_json_val *params); 590 int virtio_blk_transport_destroy(struct spdk_virtio_blk_transport *transport, 591 spdk_vhost_fini_cb cb_fn); 592 struct spdk_virtio_blk_transport *virtio_blk_transport_get_first(void); 593 struct spdk_virtio_blk_transport *virtio_blk_transport_get_next( 594 struct spdk_virtio_blk_transport *transport); 595 void virtio_blk_transport_dump_opts(struct spdk_virtio_blk_transport *transport, 596 struct spdk_json_write_ctx *w); 597 struct spdk_virtio_blk_transport *virtio_blk_tgt_get_transport(const char *transport_name); 598 const struct spdk_virtio_blk_transport_ops *virtio_blk_get_transport_ops( 599 const char *transport_name); 600 601 void vhost_session_info_json(struct spdk_vhost_dev *vdev, struct spdk_json_write_ctx *w); 602 603 /* 604 * Macro used to register new transports. 605 */ 606 #define SPDK_VIRTIO_BLK_TRANSPORT_REGISTER(name, transport_ops) \ 607 static void __attribute__((constructor)) _virtio_blk_transport_register_##name(void) \ 608 { \ 609 virtio_blk_transport_register(transport_ops); \ 610 } 611 612 #endif /* SPDK_VHOST_INTERNAL_H */ 613