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_RING_PACKED) | \ 52 (1ULL << VIRTIO_F_ANY_LAYOUT)) 53 54 #define SPDK_VHOST_DISABLED_FEATURES ((1ULL << VIRTIO_RING_F_EVENT_IDX) | \ 55 (1ULL << VIRTIO_F_NOTIFY_ON_EMPTY)) 56 57 #define VRING_DESC_F_AVAIL (1ULL << VRING_PACKED_DESC_F_AVAIL) 58 #define VRING_DESC_F_USED (1ULL << VRING_PACKED_DESC_F_USED) 59 #define VRING_DESC_F_AVAIL_USED (VRING_DESC_F_AVAIL | VRING_DESC_F_USED) 60 61 typedef struct rte_vhost_resubmit_desc spdk_vhost_resubmit_desc; 62 typedef struct rte_vhost_resubmit_info spdk_vhost_resubmit_info; 63 typedef struct rte_vhost_inflight_desc_packed spdk_vhost_inflight_desc; 64 65 struct spdk_vhost_virtqueue { 66 struct rte_vhost_vring vring; 67 struct rte_vhost_ring_inflight vring_inflight; 68 uint16_t last_avail_idx; 69 uint16_t last_used_idx; 70 71 struct { 72 /* To mark a descriptor as available in packed ring 73 * Equal to avail_wrap_counter in spec. 74 */ 75 uint8_t avail_phase : 1; 76 /* To mark a descriptor as used in packed ring 77 * Equal to used_wrap_counter in spec. 78 */ 79 uint8_t used_phase : 1; 80 uint8_t padding : 5; 81 bool packed_ring : 1; 82 } packed; 83 84 void *tasks; 85 86 /* Request count from last stats check */ 87 uint32_t req_cnt; 88 89 /* Request count from last event */ 90 uint16_t used_req_cnt; 91 92 /* How long interrupt is delayed */ 93 uint32_t irq_delay_time; 94 95 /* Next time when we need to send event */ 96 uint64_t next_event_time; 97 98 /* Associated vhost_virtqueue in the virtio device's virtqueue list */ 99 uint32_t vring_idx; 100 101 struct spdk_vhost_session *vsession; 102 103 struct spdk_interrupt *intr; 104 } __attribute((aligned(SPDK_CACHE_LINE_SIZE))); 105 106 struct spdk_vhost_session { 107 struct spdk_vhost_dev *vdev; 108 109 /* rte_vhost connection ID. */ 110 int vid; 111 112 /* Unique session ID. */ 113 uint64_t id; 114 /* Unique session name. */ 115 char *name; 116 117 bool started; 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 /* Current connections to the device */ 158 TAILQ_HEAD(, spdk_vhost_session) vsessions; 159 160 /* Increment-only session counter */ 161 uint64_t vsessions_num; 162 163 /* Number of started and actively polled sessions */ 164 uint32_t active_session_num; 165 166 /* Number of pending asynchronous operations */ 167 uint32_t pending_async_op_num; 168 }; 169 170 struct spdk_vhost_dev { 171 char *name; 172 char *path; 173 174 struct spdk_thread *thread; 175 bool registered; 176 177 uint64_t virtio_features; 178 uint64_t disabled_features; 179 uint64_t protocol_features; 180 bool packed_ring_recovery; 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 /** 191 * \param vdev vhost device. 192 * \param vsession vhost session. 193 * \param arg user-provided parameter. 194 * 195 * \return negative values will break the foreach call, meaning 196 * the function won't be called again. Return codes zero and 197 * positive don't have any effect. 198 */ 199 typedef int (*spdk_vhost_session_fn)(struct spdk_vhost_dev *vdev, 200 struct spdk_vhost_session *vsession, 201 void *arg); 202 203 /** 204 * \param vdev vhost device. 205 * \param arg user-provided parameter. 206 */ 207 typedef void (*spdk_vhost_dev_fn)(struct spdk_vhost_dev *vdev, void *arg); 208 209 struct spdk_vhost_user_dev_backend { 210 /** 211 * Size of additional per-session context data 212 * allocated whenever a new client connects. 213 */ 214 size_t session_ctx_size; 215 216 spdk_vhost_session_fn start_session; 217 int (*stop_session)(struct spdk_vhost_session *vsession); 218 int (*alloc_vq_tasks)(struct spdk_vhost_session *vsession, uint16_t qid); 219 }; 220 221 enum vhost_backend_type { 222 VHOST_BACKEND_BLK = 0, 223 VHOST_BACKEND_SCSI, 224 }; 225 226 struct spdk_vhost_dev_backend { 227 enum vhost_backend_type type; 228 229 int (*vhost_get_config)(struct spdk_vhost_dev *vdev, uint8_t *config, uint32_t len); 230 int (*vhost_set_config)(struct spdk_vhost_dev *vdev, uint8_t *config, 231 uint32_t offset, uint32_t size, uint32_t flags); 232 233 void (*dump_info_json)(struct spdk_vhost_dev *vdev, struct spdk_json_write_ctx *w); 234 void (*write_config_json)(struct spdk_vhost_dev *vdev, struct spdk_json_write_ctx *w); 235 int (*remove_device)(struct spdk_vhost_dev *vdev); 236 }; 237 238 void *vhost_gpa_to_vva(struct spdk_vhost_session *vsession, uint64_t addr, uint64_t len); 239 240 uint16_t vhost_vq_avail_ring_get(struct spdk_vhost_virtqueue *vq, uint16_t *reqs, 241 uint16_t reqs_len); 242 243 /** 244 * Get a virtio split descriptor at given index in given virtqueue. 245 * The descriptor will provide access to the entire descriptor 246 * chain. The subsequent descriptors are accessible via 247 * \c spdk_vhost_vring_desc_get_next. 248 * \param vsession vhost session 249 * \param vq virtqueue 250 * \param req_idx descriptor index 251 * \param desc pointer to be set to the descriptor 252 * \param desc_table descriptor table to be used with 253 * \c spdk_vhost_vring_desc_get_next. This might be either 254 * default virtqueue descriptor table or per-chain indirect 255 * table. 256 * \param desc_table_size size of the *desc_table* 257 * \return 0 on success, -1 if given index is invalid. 258 * If -1 is returned, the content of params is undefined. 259 */ 260 int vhost_vq_get_desc(struct spdk_vhost_session *vsession, struct spdk_vhost_virtqueue *vq, 261 uint16_t req_idx, struct vring_desc **desc, struct vring_desc **desc_table, 262 uint32_t *desc_table_size); 263 264 /** 265 * Get a virtio packed descriptor at given index in given virtqueue. 266 * The descriptor will provide access to the entire descriptor 267 * chain. The subsequent descriptors are accessible via 268 * \c vhost_vring_packed_desc_get_next. 269 * \param vsession vhost session 270 * \param vq virtqueue 271 * \param req_idx descriptor index 272 * \param desc pointer to be set to the descriptor 273 * \param desc_table descriptor table to be used with 274 * \c spdk_vhost_vring_desc_get_next. This might be either 275 * \c NULL or per-chain indirect table. 276 * \param desc_table_size size of the *desc_table* 277 * \return 0 on success, -1 if given index is invalid. 278 * If -1 is returned, the content of params is undefined. 279 */ 280 int vhost_vq_get_desc_packed(struct spdk_vhost_session *vsession, 281 struct spdk_vhost_virtqueue *virtqueue, 282 uint16_t req_idx, struct vring_packed_desc **desc, 283 struct vring_packed_desc **desc_table, uint32_t *desc_table_size); 284 285 int vhost_inflight_queue_get_desc(struct spdk_vhost_session *vsession, 286 spdk_vhost_inflight_desc *desc_array, 287 uint16_t req_idx, spdk_vhost_inflight_desc **desc, 288 struct vring_packed_desc **desc_table, uint32_t *desc_table_size); 289 290 /** 291 * Send IRQ/call client (if pending) for \c vq. 292 * \param vsession vhost session 293 * \param vq virtqueue 294 * \return 295 * 0 - if no interrupt was signalled 296 * 1 - if interrupt was signalled 297 */ 298 int vhost_vq_used_signal(struct spdk_vhost_session *vsession, struct spdk_vhost_virtqueue *vq); 299 300 /** 301 * Send IRQs for the queue that need to be signaled. 302 * \param vq virtqueue 303 */ 304 void vhost_session_vq_used_signal(struct spdk_vhost_virtqueue *virtqueue); 305 306 void vhost_vq_used_ring_enqueue(struct spdk_vhost_session *vsession, 307 struct spdk_vhost_virtqueue *vq, 308 uint16_t id, uint32_t len); 309 310 /** 311 * Enqueue the entry to the used ring when device complete the request. 312 * \param vsession vhost session 313 * \param vq virtqueue 314 * \req_idx descriptor index. It's the first index of this descriptor chain. 315 * \num_descs descriptor count. It's the count of the number of buffers in the chain. 316 * \buffer_id descriptor buffer ID. 317 * \length device write length. Specify the length of the buffer that has been initialized 318 * (written to) by the device 319 * \inflight_head the head idx of this IO inflight desc chain. 320 */ 321 void vhost_vq_packed_ring_enqueue(struct spdk_vhost_session *vsession, 322 struct spdk_vhost_virtqueue *virtqueue, 323 uint16_t num_descs, uint16_t buffer_id, 324 uint32_t length, uint16_t inflight_head); 325 326 /** 327 * Get subsequent descriptor from given table. 328 * \param desc current descriptor, will be set to the 329 * next descriptor (NULL in case this is the last 330 * descriptor in the chain or the next desc is invalid) 331 * \param desc_table descriptor table 332 * \param desc_table_size size of the *desc_table* 333 * \return 0 on success, -1 if given index is invalid 334 * The *desc* param will be set regardless of the 335 * return value. 336 */ 337 int vhost_vring_desc_get_next(struct vring_desc **desc, 338 struct vring_desc *desc_table, uint32_t desc_table_size); 339 static inline bool 340 vhost_vring_desc_is_wr(struct vring_desc *cur_desc) 341 { 342 return !!(cur_desc->flags & VRING_DESC_F_WRITE); 343 } 344 345 int vhost_vring_desc_to_iov(struct spdk_vhost_session *vsession, struct iovec *iov, 346 uint16_t *iov_index, const struct vring_desc *desc); 347 348 bool vhost_vq_packed_ring_is_avail(struct spdk_vhost_virtqueue *virtqueue); 349 350 /** 351 * Get subsequent descriptor from vq or desc table. 352 * \param desc current descriptor, will be set to the 353 * next descriptor (NULL in case this is the last 354 * descriptor in the chain or the next desc is invalid) 355 * \req_idx index of current desc, will be set to the next 356 * index. If desc_table != NULL the req_idx is the the vring index 357 * or the req_idx is the desc_table index. 358 * \param desc_table descriptor table 359 * \param desc_table_size size of the *desc_table* 360 * \return 0 on success, -1 if given index is invalid 361 * The *desc* param will be set regardless of the 362 * return value. 363 */ 364 int vhost_vring_packed_desc_get_next(struct vring_packed_desc **desc, uint16_t *req_idx, 365 struct spdk_vhost_virtqueue *vq, 366 struct vring_packed_desc *desc_table, 367 uint32_t desc_table_size); 368 369 bool vhost_vring_packed_desc_is_wr(struct vring_packed_desc *cur_desc); 370 371 int vhost_vring_packed_desc_to_iov(struct spdk_vhost_session *vsession, struct iovec *iov, 372 uint16_t *iov_index, const struct vring_packed_desc *desc); 373 374 bool vhost_vring_inflight_desc_is_wr(spdk_vhost_inflight_desc *cur_desc); 375 376 int vhost_vring_inflight_desc_to_iov(struct spdk_vhost_session *vsession, struct iovec *iov, 377 uint16_t *iov_index, const spdk_vhost_inflight_desc *desc); 378 379 uint16_t vhost_vring_packed_desc_get_buffer_id(struct spdk_vhost_virtqueue *vq, uint16_t req_idx, 380 uint16_t *num_descs); 381 382 static inline bool 383 __attribute__((always_inline)) 384 vhost_dev_has_feature(struct spdk_vhost_session *vsession, unsigned feature_id) 385 { 386 return vsession->negotiated_features & (1ULL << feature_id); 387 } 388 389 int vhost_dev_register(struct spdk_vhost_dev *vdev, const char *name, const char *mask_str, 390 const struct spdk_json_val *params, 391 const struct spdk_vhost_dev_backend *backend, 392 const struct spdk_vhost_user_dev_backend *user_backend); 393 int vhost_dev_unregister(struct spdk_vhost_dev *vdev); 394 395 void vhost_dump_info_json(struct spdk_vhost_dev *vdev, struct spdk_json_write_ctx *w); 396 397 /* 398 * Set vhost session to run in interrupt or poll mode 399 */ 400 void vhost_user_session_set_interrupt_mode(struct spdk_vhost_session *vsession, 401 bool interrupt_mode); 402 403 /* 404 * Memory registration functions used in start/stop device callbacks 405 */ 406 void vhost_session_mem_register(struct rte_vhost_memory *mem); 407 void vhost_session_mem_unregister(struct rte_vhost_memory *mem); 408 409 /* 410 * Call a function for each session of the provided vhost device. 411 * The function will be called one-by-one on each session's thread. 412 * 413 * \param vdev vhost device 414 * \param fn function to call on each session's thread 415 * \param cpl_fn function to be called at the end of the iteration on 416 * the vhost management thread. 417 * Optional, can be NULL. 418 * \param arg additional argument to the both callbacks 419 */ 420 void vhost_user_dev_foreach_session(struct spdk_vhost_dev *dev, 421 spdk_vhost_session_fn fn, 422 spdk_vhost_dev_fn cpl_fn, 423 void *arg); 424 425 /** 426 * Call a function on the provided lcore and block until either 427 * vhost_user_session_start_done() or vhost_user_session_stop_done() 428 * is called. 429 * 430 * This must be called under the global vhost mutex, which this function 431 * will unlock for the time it's waiting. It's meant to be called only 432 * from start/stop session callbacks. 433 * 434 * \param vsession vhost session 435 * \param cb_fn the function to call. The void *arg parameter in cb_fn 436 * is always NULL. 437 * \param timeout_sec timeout in seconds. This function will still 438 * block after the timeout expires, but will print the provided errmsg. 439 * \param errmsg error message to print once the timeout expires 440 * \return return the code passed to spdk_vhost_session_event_done(). 441 */ 442 int vhost_user_session_send_event(struct spdk_vhost_session *vsession, 443 spdk_vhost_session_fn cb_fn, unsigned timeout_sec, 444 const char *errmsg); 445 446 /** 447 * Finish a blocking spdk_vhost_user_session_send_event() call and finally 448 * start the session. This must be called on the target lcore, which 449 * will now receive all session-related messages (e.g. from 450 * vhost_user_dev_foreach_session()). 451 * 452 * Must be called under the global vhost lock. 453 * 454 * \param vsession vhost session 455 * \param response return code 456 */ 457 void vhost_user_session_start_done(struct spdk_vhost_session *vsession, int response); 458 459 /** 460 * Finish a blocking spdk_vhost_user_session_send_event() call and finally 461 * stop the session. This must be called on the session's lcore which 462 * used to receive all session-related messages (e.g. from 463 * vhost_user_dev_foreach_session()). After this call, the session- 464 * related messages will be once again processed by any arbitrary thread. 465 * 466 * Must be called under the global vhost lock. 467 * 468 * Must be called under the global vhost mutex. 469 * 470 * \param vsession vhost session 471 * \param response return code 472 */ 473 void vhost_user_session_stop_done(struct spdk_vhost_session *vsession, int response); 474 475 struct spdk_vhost_session *vhost_session_find_by_vid(int vid); 476 void vhost_session_install_rte_compat_hooks(struct spdk_vhost_session *vsession); 477 int vhost_register_unix_socket(const char *path, const char *ctrl_name, 478 uint64_t virtio_features, uint64_t disabled_features, uint64_t protocol_features); 479 int vhost_driver_unregister(const char *path); 480 int vhost_get_mem_table(int vid, struct rte_vhost_memory **mem); 481 int vhost_get_negotiated_features(int vid, uint64_t *negotiated_features); 482 483 int remove_vhost_controller(struct spdk_vhost_dev *vdev); 484 485 struct spdk_io_channel *vhost_blk_get_io_channel(struct spdk_vhost_dev *vdev); 486 void vhost_blk_put_io_channel(struct spdk_io_channel *ch); 487 488 /* The spdk_bdev pointer should only be used to retrieve 489 * the device properties, ex. number of blocks or I/O type supported. */ 490 struct spdk_bdev *vhost_blk_get_bdev(struct spdk_vhost_dev *vdev); 491 492 /* Function calls from vhost.c to rte_vhost_user.c, 493 * shall removed once virtio transport abstraction is complete. */ 494 int vhost_user_session_set_coalescing(struct spdk_vhost_dev *dev, 495 struct spdk_vhost_session *vsession, void *ctx); 496 int vhost_user_dev_set_coalescing(struct spdk_vhost_user_dev *user_dev, uint32_t delay_base_us, 497 uint32_t iops_threshold); 498 int vhost_user_dev_register(struct spdk_vhost_dev *vdev, const char *name, 499 struct spdk_cpuset *cpumask, const struct spdk_vhost_user_dev_backend *user_backend); 500 int vhost_user_dev_unregister(struct spdk_vhost_dev *vdev); 501 int vhost_user_init(void); 502 void vhost_user_fini(spdk_vhost_fini_cb vhost_cb); 503 504 int virtio_blk_construct_ctrlr(struct spdk_vhost_dev *vdev, const char *address, 505 struct spdk_cpuset *cpumask, const struct spdk_json_val *params, 506 const struct spdk_vhost_user_dev_backend *user_backend); 507 int virtio_blk_destroy_ctrlr(struct spdk_vhost_dev *vdev); 508 509 struct spdk_vhost_blk_task; 510 511 typedef void (*virtio_blk_request_cb)(uint8_t status, struct spdk_vhost_blk_task *task, 512 void *cb_arg); 513 514 struct spdk_vhost_blk_task { 515 struct spdk_bdev_io *bdev_io; 516 virtio_blk_request_cb cb; 517 void *cb_arg; 518 519 volatile uint8_t *status; 520 521 /* for io wait */ 522 struct spdk_bdev_io_wait_entry bdev_io_wait; 523 struct spdk_io_channel *bdev_io_wait_ch; 524 struct spdk_vhost_dev *bdev_io_wait_vdev; 525 526 /** Number of bytes that were written. */ 527 uint32_t used_len; 528 uint16_t iovcnt; 529 struct iovec iovs[SPDK_VHOST_IOVS_MAX]; 530 531 /** Size of whole payload in bytes */ 532 uint32_t payload_size; 533 }; 534 535 int virtio_blk_process_request(struct spdk_vhost_dev *vdev, struct spdk_io_channel *ch, 536 struct spdk_vhost_blk_task *task, virtio_blk_request_cb cb, void *cb_arg); 537 538 typedef void (*bdev_event_cb_complete)(struct spdk_vhost_dev *vdev, void *ctx); 539 540 #define SPDK_VIRTIO_BLK_TRSTRING_MAX_LEN 32 541 542 struct spdk_virtio_blk_transport_ops { 543 /** 544 * Transport name 545 */ 546 char name[SPDK_VIRTIO_BLK_TRSTRING_MAX_LEN]; 547 548 /** 549 * Create a transport for the given transport opts 550 */ 551 struct spdk_virtio_blk_transport *(*create)(const struct spdk_json_val *params); 552 553 /** 554 * Dump transport-specific opts into JSON 555 */ 556 void (*dump_opts)(struct spdk_virtio_blk_transport *transport, struct spdk_json_write_ctx *w); 557 558 /** 559 * Destroy the transport 560 */ 561 int (*destroy)(struct spdk_virtio_blk_transport *transport, 562 spdk_vhost_fini_cb cb_fn); 563 564 /** 565 * Create vhost block controller 566 */ 567 int (*create_ctrlr)(struct spdk_vhost_dev *vdev, struct spdk_cpuset *cpumask, 568 const char *address, const struct spdk_json_val *params, 569 void *custom_opts); 570 571 /** 572 * Destroy vhost block controller 573 */ 574 int (*destroy_ctrlr)(struct spdk_vhost_dev *vdev); 575 576 /* 577 * Signal removal of the bdev. 578 */ 579 void (*bdev_event)(enum spdk_bdev_event_type type, struct spdk_vhost_dev *vdev, 580 bdev_event_cb_complete cb, void *cb_arg); 581 }; 582 583 struct spdk_virtio_blk_transport { 584 const struct spdk_virtio_blk_transport_ops *ops; 585 TAILQ_ENTRY(spdk_virtio_blk_transport) tailq; 586 }; 587 588 struct virtio_blk_transport_ops_list_element { 589 struct spdk_virtio_blk_transport_ops ops; 590 TAILQ_ENTRY(virtio_blk_transport_ops_list_element) link; 591 }; 592 593 void virtio_blk_transport_register(const struct spdk_virtio_blk_transport_ops *ops); 594 int virtio_blk_transport_create(const char *transport_name, const struct spdk_json_val *params); 595 int virtio_blk_transport_destroy(struct spdk_virtio_blk_transport *transport, 596 spdk_vhost_fini_cb cb_fn); 597 598 const struct spdk_virtio_blk_transport_ops *virtio_blk_get_transport_ops( 599 const char *transport_name); 600 601 602 /* 603 * Macro used to register new transports. 604 */ 605 #define SPDK_VIRTIO_BLK_TRANSPORT_REGISTER(name, transport_ops) \ 606 static void __attribute__((constructor)) _virtio_blk_transport_register_##name(void) \ 607 { \ 608 virtio_blk_transport_register(transport_ops); \ 609 } 610 611 #endif /* SPDK_VHOST_INTERNAL_H */ 612