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