1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (c) 2015-2016 HGST, a Western Digital Company. 4 */ 5 6 #ifndef _NVMET_H 7 #define _NVMET_H 8 9 #include <linux/dma-mapping.h> 10 #include <linux/types.h> 11 #include <linux/device.h> 12 #include <linux/kref.h> 13 #include <linux/percpu-refcount.h> 14 #include <linux/list.h> 15 #include <linux/mutex.h> 16 #include <linux/uuid.h> 17 #include <linux/nvme.h> 18 #include <linux/configfs.h> 19 #include <linux/rcupdate.h> 20 #include <linux/blkdev.h> 21 #include <linux/radix-tree.h> 22 #include <linux/t10-pi.h> 23 24 #define NVMET_DEFAULT_VS NVME_VS(1, 3, 0) 25 26 #define NVMET_ASYNC_EVENTS 4 27 #define NVMET_ERROR_LOG_SLOTS 128 28 #define NVMET_NO_ERROR_LOC ((u16)-1) 29 #define NVMET_DEFAULT_CTRL_MODEL "Linux" 30 31 /* 32 * Supported optional AENs: 33 */ 34 #define NVMET_AEN_CFG_OPTIONAL \ 35 (NVME_AEN_CFG_NS_ATTR | NVME_AEN_CFG_ANA_CHANGE) 36 #define NVMET_DISC_AEN_CFG_OPTIONAL \ 37 (NVME_AEN_CFG_DISC_CHANGE) 38 39 /* 40 * Plus mandatory SMART AENs (we'll never send them, but allow enabling them): 41 */ 42 #define NVMET_AEN_CFG_ALL \ 43 (NVME_SMART_CRIT_SPARE | NVME_SMART_CRIT_TEMPERATURE | \ 44 NVME_SMART_CRIT_RELIABILITY | NVME_SMART_CRIT_MEDIA | \ 45 NVME_SMART_CRIT_VOLATILE_MEMORY | NVMET_AEN_CFG_OPTIONAL) 46 47 /* Helper Macros when NVMe error is NVME_SC_CONNECT_INVALID_PARAM 48 * The 16 bit shift is to set IATTR bit to 1, which means offending 49 * offset starts in the data section of connect() 50 */ 51 #define IPO_IATTR_CONNECT_DATA(x) \ 52 (cpu_to_le32((1 << 16) | (offsetof(struct nvmf_connect_data, x)))) 53 #define IPO_IATTR_CONNECT_SQE(x) \ 54 (cpu_to_le32(offsetof(struct nvmf_connect_command, x))) 55 56 struct nvmet_ns { 57 struct percpu_ref ref; 58 struct block_device *bdev; 59 struct file *file; 60 bool readonly; 61 u32 nsid; 62 u32 blksize_shift; 63 loff_t size; 64 u8 nguid[16]; 65 uuid_t uuid; 66 u32 anagrpid; 67 68 bool buffered_io; 69 bool enabled; 70 struct nvmet_subsys *subsys; 71 const char *device_path; 72 73 struct config_group device_group; 74 struct config_group group; 75 76 struct completion disable_done; 77 mempool_t *bvec_pool; 78 struct kmem_cache *bvec_cache; 79 80 int use_p2pmem; 81 struct pci_dev *p2p_dev; 82 int pi_type; 83 int metadata_size; 84 }; 85 86 static inline struct nvmet_ns *to_nvmet_ns(struct config_item *item) 87 { 88 return container_of(to_config_group(item), struct nvmet_ns, group); 89 } 90 91 static inline struct device *nvmet_ns_dev(struct nvmet_ns *ns) 92 { 93 return ns->bdev ? disk_to_dev(ns->bdev->bd_disk) : NULL; 94 } 95 96 struct nvmet_cq { 97 u16 qid; 98 u16 size; 99 }; 100 101 struct nvmet_sq { 102 struct nvmet_ctrl *ctrl; 103 struct percpu_ref ref; 104 u16 qid; 105 u16 size; 106 u32 sqhd; 107 bool sqhd_disabled; 108 struct completion free_done; 109 struct completion confirm_done; 110 }; 111 112 struct nvmet_ana_group { 113 struct config_group group; 114 struct nvmet_port *port; 115 u32 grpid; 116 }; 117 118 static inline struct nvmet_ana_group *to_ana_group(struct config_item *item) 119 { 120 return container_of(to_config_group(item), struct nvmet_ana_group, 121 group); 122 } 123 124 /** 125 * struct nvmet_port - Common structure to keep port 126 * information for the target. 127 * @entry: Entry into referrals or transport list. 128 * @disc_addr: Address information is stored in a format defined 129 * for a discovery log page entry. 130 * @group: ConfigFS group for this element's folder. 131 * @priv: Private data for the transport. 132 */ 133 struct nvmet_port { 134 struct list_head entry; 135 struct nvmf_disc_rsp_page_entry disc_addr; 136 struct config_group group; 137 struct config_group subsys_group; 138 struct list_head subsystems; 139 struct config_group referrals_group; 140 struct list_head referrals; 141 struct list_head global_entry; 142 struct config_group ana_groups_group; 143 struct nvmet_ana_group ana_default_group; 144 enum nvme_ana_state *ana_state; 145 void *priv; 146 bool enabled; 147 int inline_data_size; 148 const struct nvmet_fabrics_ops *tr_ops; 149 bool pi_enable; 150 }; 151 152 static inline struct nvmet_port *to_nvmet_port(struct config_item *item) 153 { 154 return container_of(to_config_group(item), struct nvmet_port, 155 group); 156 } 157 158 static inline struct nvmet_port *ana_groups_to_port( 159 struct config_item *item) 160 { 161 return container_of(to_config_group(item), struct nvmet_port, 162 ana_groups_group); 163 } 164 165 struct nvmet_ctrl { 166 struct nvmet_subsys *subsys; 167 struct nvmet_sq **sqs; 168 169 bool cmd_seen; 170 171 struct mutex lock; 172 u64 cap; 173 u32 cc; 174 u32 csts; 175 176 uuid_t hostid; 177 u16 cntlid; 178 u32 kato; 179 180 struct nvmet_port *port; 181 182 u32 aen_enabled; 183 unsigned long aen_masked; 184 struct nvmet_req *async_event_cmds[NVMET_ASYNC_EVENTS]; 185 unsigned int nr_async_event_cmds; 186 struct list_head async_events; 187 struct work_struct async_event_work; 188 189 struct list_head subsys_entry; 190 struct kref ref; 191 struct delayed_work ka_work; 192 struct work_struct fatal_err_work; 193 194 const struct nvmet_fabrics_ops *ops; 195 196 __le32 *changed_ns_list; 197 u32 nr_changed_ns; 198 199 char subsysnqn[NVMF_NQN_FIELD_LEN]; 200 char hostnqn[NVMF_NQN_FIELD_LEN]; 201 202 struct device *p2p_client; 203 struct radix_tree_root p2p_ns_map; 204 205 spinlock_t error_lock; 206 u64 err_counter; 207 struct nvme_error_slot slots[NVMET_ERROR_LOG_SLOTS]; 208 bool pi_support; 209 }; 210 211 struct nvmet_subsys_model { 212 struct rcu_head rcuhead; 213 char number[]; 214 }; 215 216 struct nvmet_subsys { 217 enum nvme_subsys_type type; 218 219 struct mutex lock; 220 struct kref ref; 221 222 struct xarray namespaces; 223 unsigned int nr_namespaces; 224 unsigned int max_nsid; 225 u16 cntlid_min; 226 u16 cntlid_max; 227 228 struct list_head ctrls; 229 230 struct list_head hosts; 231 bool allow_any_host; 232 233 u16 max_qid; 234 235 u64 ver; 236 u64 serial; 237 char *subsysnqn; 238 bool pi_support; 239 240 struct config_group group; 241 242 struct config_group namespaces_group; 243 struct config_group allowed_hosts_group; 244 245 struct nvmet_subsys_model __rcu *model; 246 247 #ifdef CONFIG_NVME_TARGET_PASSTHRU 248 struct nvme_ctrl *passthru_ctrl; 249 char *passthru_ctrl_path; 250 struct config_group passthru_group; 251 unsigned int admin_timeout; 252 unsigned int io_timeout; 253 #endif /* CONFIG_NVME_TARGET_PASSTHRU */ 254 }; 255 256 static inline struct nvmet_subsys *to_subsys(struct config_item *item) 257 { 258 return container_of(to_config_group(item), struct nvmet_subsys, group); 259 } 260 261 static inline struct nvmet_subsys *namespaces_to_subsys( 262 struct config_item *item) 263 { 264 return container_of(to_config_group(item), struct nvmet_subsys, 265 namespaces_group); 266 } 267 268 struct nvmet_host { 269 struct config_group group; 270 }; 271 272 static inline struct nvmet_host *to_host(struct config_item *item) 273 { 274 return container_of(to_config_group(item), struct nvmet_host, group); 275 } 276 277 static inline char *nvmet_host_name(struct nvmet_host *host) 278 { 279 return config_item_name(&host->group.cg_item); 280 } 281 282 struct nvmet_host_link { 283 struct list_head entry; 284 struct nvmet_host *host; 285 }; 286 287 struct nvmet_subsys_link { 288 struct list_head entry; 289 struct nvmet_subsys *subsys; 290 }; 291 292 struct nvmet_req; 293 struct nvmet_fabrics_ops { 294 struct module *owner; 295 unsigned int type; 296 unsigned int msdbd; 297 unsigned int flags; 298 #define NVMF_KEYED_SGLS (1 << 0) 299 #define NVMF_METADATA_SUPPORTED (1 << 1) 300 void (*queue_response)(struct nvmet_req *req); 301 int (*add_port)(struct nvmet_port *port); 302 void (*remove_port)(struct nvmet_port *port); 303 void (*delete_ctrl)(struct nvmet_ctrl *ctrl); 304 void (*disc_traddr)(struct nvmet_req *req, 305 struct nvmet_port *port, char *traddr); 306 u16 (*install_queue)(struct nvmet_sq *nvme_sq); 307 void (*discovery_chg)(struct nvmet_port *port); 308 u8 (*get_mdts)(const struct nvmet_ctrl *ctrl); 309 }; 310 311 #define NVMET_MAX_INLINE_BIOVEC 8 312 #define NVMET_MAX_INLINE_DATA_LEN NVMET_MAX_INLINE_BIOVEC * PAGE_SIZE 313 314 struct nvmet_req { 315 struct nvme_command *cmd; 316 struct nvme_completion *cqe; 317 struct nvmet_sq *sq; 318 struct nvmet_cq *cq; 319 struct nvmet_ns *ns; 320 struct scatterlist *sg; 321 struct scatterlist *metadata_sg; 322 struct bio_vec inline_bvec[NVMET_MAX_INLINE_BIOVEC]; 323 union { 324 struct { 325 struct bio inline_bio; 326 } b; 327 struct { 328 bool mpool_alloc; 329 struct kiocb iocb; 330 struct bio_vec *bvec; 331 struct work_struct work; 332 } f; 333 struct { 334 struct bio inline_bio; 335 struct request *rq; 336 struct work_struct work; 337 bool use_workqueue; 338 } p; 339 }; 340 int sg_cnt; 341 int metadata_sg_cnt; 342 /* data length as parsed from the SGL descriptor: */ 343 size_t transfer_len; 344 size_t metadata_len; 345 346 struct nvmet_port *port; 347 348 void (*execute)(struct nvmet_req *req); 349 const struct nvmet_fabrics_ops *ops; 350 351 struct pci_dev *p2p_dev; 352 struct device *p2p_client; 353 u16 error_loc; 354 u64 error_slba; 355 }; 356 357 extern struct workqueue_struct *buffered_io_wq; 358 359 static inline void nvmet_set_result(struct nvmet_req *req, u32 result) 360 { 361 req->cqe->result.u32 = cpu_to_le32(result); 362 } 363 364 /* 365 * NVMe command writes actually are DMA reads for us on the target side. 366 */ 367 static inline enum dma_data_direction 368 nvmet_data_dir(struct nvmet_req *req) 369 { 370 return nvme_is_write(req->cmd) ? DMA_FROM_DEVICE : DMA_TO_DEVICE; 371 } 372 373 struct nvmet_async_event { 374 struct list_head entry; 375 u8 event_type; 376 u8 event_info; 377 u8 log_page; 378 }; 379 380 static inline void nvmet_clear_aen_bit(struct nvmet_req *req, u32 bn) 381 { 382 int rae = le32_to_cpu(req->cmd->common.cdw10) & 1 << 15; 383 384 if (!rae) 385 clear_bit(bn, &req->sq->ctrl->aen_masked); 386 } 387 388 static inline bool nvmet_aen_bit_disabled(struct nvmet_ctrl *ctrl, u32 bn) 389 { 390 if (!(READ_ONCE(ctrl->aen_enabled) & (1 << bn))) 391 return true; 392 return test_and_set_bit(bn, &ctrl->aen_masked); 393 } 394 395 void nvmet_get_feat_kato(struct nvmet_req *req); 396 void nvmet_get_feat_async_event(struct nvmet_req *req); 397 u16 nvmet_set_feat_kato(struct nvmet_req *req); 398 u16 nvmet_set_feat_async_event(struct nvmet_req *req, u32 mask); 399 void nvmet_execute_async_event(struct nvmet_req *req); 400 void nvmet_start_keep_alive_timer(struct nvmet_ctrl *ctrl); 401 void nvmet_stop_keep_alive_timer(struct nvmet_ctrl *ctrl); 402 403 u16 nvmet_parse_connect_cmd(struct nvmet_req *req); 404 void nvmet_bdev_set_limits(struct block_device *bdev, struct nvme_id_ns *id); 405 u16 nvmet_bdev_parse_io_cmd(struct nvmet_req *req); 406 u16 nvmet_file_parse_io_cmd(struct nvmet_req *req); 407 u16 nvmet_parse_admin_cmd(struct nvmet_req *req); 408 u16 nvmet_parse_discovery_cmd(struct nvmet_req *req); 409 u16 nvmet_parse_fabrics_cmd(struct nvmet_req *req); 410 411 bool nvmet_req_init(struct nvmet_req *req, struct nvmet_cq *cq, 412 struct nvmet_sq *sq, const struct nvmet_fabrics_ops *ops); 413 void nvmet_req_uninit(struct nvmet_req *req); 414 bool nvmet_check_transfer_len(struct nvmet_req *req, size_t len); 415 bool nvmet_check_data_len_lte(struct nvmet_req *req, size_t data_len); 416 void nvmet_req_complete(struct nvmet_req *req, u16 status); 417 int nvmet_req_alloc_sgls(struct nvmet_req *req); 418 void nvmet_req_free_sgls(struct nvmet_req *req); 419 420 void nvmet_execute_set_features(struct nvmet_req *req); 421 void nvmet_execute_get_features(struct nvmet_req *req); 422 void nvmet_execute_keep_alive(struct nvmet_req *req); 423 424 void nvmet_cq_setup(struct nvmet_ctrl *ctrl, struct nvmet_cq *cq, u16 qid, 425 u16 size); 426 void nvmet_sq_setup(struct nvmet_ctrl *ctrl, struct nvmet_sq *sq, u16 qid, 427 u16 size); 428 void nvmet_sq_destroy(struct nvmet_sq *sq); 429 int nvmet_sq_init(struct nvmet_sq *sq); 430 431 void nvmet_ctrl_fatal_error(struct nvmet_ctrl *ctrl); 432 433 void nvmet_update_cc(struct nvmet_ctrl *ctrl, u32 new); 434 u16 nvmet_alloc_ctrl(const char *subsysnqn, const char *hostnqn, 435 struct nvmet_req *req, u32 kato, struct nvmet_ctrl **ctrlp); 436 u16 nvmet_ctrl_find_get(const char *subsysnqn, const char *hostnqn, u16 cntlid, 437 struct nvmet_req *req, struct nvmet_ctrl **ret); 438 void nvmet_ctrl_put(struct nvmet_ctrl *ctrl); 439 u16 nvmet_check_ctrl_status(struct nvmet_req *req, struct nvme_command *cmd); 440 441 struct nvmet_subsys *nvmet_subsys_alloc(const char *subsysnqn, 442 enum nvme_subsys_type type); 443 void nvmet_subsys_put(struct nvmet_subsys *subsys); 444 void nvmet_subsys_del_ctrls(struct nvmet_subsys *subsys); 445 446 struct nvmet_ns *nvmet_find_namespace(struct nvmet_ctrl *ctrl, __le32 nsid); 447 void nvmet_put_namespace(struct nvmet_ns *ns); 448 int nvmet_ns_enable(struct nvmet_ns *ns); 449 void nvmet_ns_disable(struct nvmet_ns *ns); 450 struct nvmet_ns *nvmet_ns_alloc(struct nvmet_subsys *subsys, u32 nsid); 451 void nvmet_ns_free(struct nvmet_ns *ns); 452 453 void nvmet_send_ana_event(struct nvmet_subsys *subsys, 454 struct nvmet_port *port); 455 void nvmet_port_send_ana_event(struct nvmet_port *port); 456 457 int nvmet_register_transport(const struct nvmet_fabrics_ops *ops); 458 void nvmet_unregister_transport(const struct nvmet_fabrics_ops *ops); 459 460 void nvmet_port_del_ctrls(struct nvmet_port *port, 461 struct nvmet_subsys *subsys); 462 463 int nvmet_enable_port(struct nvmet_port *port); 464 void nvmet_disable_port(struct nvmet_port *port); 465 466 void nvmet_referral_enable(struct nvmet_port *parent, struct nvmet_port *port); 467 void nvmet_referral_disable(struct nvmet_port *parent, struct nvmet_port *port); 468 469 u16 nvmet_copy_to_sgl(struct nvmet_req *req, off_t off, const void *buf, 470 size_t len); 471 u16 nvmet_copy_from_sgl(struct nvmet_req *req, off_t off, void *buf, 472 size_t len); 473 u16 nvmet_zero_sgl(struct nvmet_req *req, off_t off, size_t len); 474 475 u32 nvmet_get_log_page_len(struct nvme_command *cmd); 476 u64 nvmet_get_log_page_offset(struct nvme_command *cmd); 477 478 extern struct list_head *nvmet_ports; 479 void nvmet_port_disc_changed(struct nvmet_port *port, 480 struct nvmet_subsys *subsys); 481 void nvmet_subsys_disc_changed(struct nvmet_subsys *subsys, 482 struct nvmet_host *host); 483 void nvmet_add_async_event(struct nvmet_ctrl *ctrl, u8 event_type, 484 u8 event_info, u8 log_page); 485 486 #define NVMET_QUEUE_SIZE 1024 487 #define NVMET_NR_QUEUES 128 488 #define NVMET_MAX_CMD NVMET_QUEUE_SIZE 489 490 /* 491 * Nice round number that makes a list of nsids fit into a page. 492 * Should become tunable at some point in the future. 493 */ 494 #define NVMET_MAX_NAMESPACES 1024 495 496 /* 497 * 0 is not a valid ANA group ID, so we start numbering at 1. 498 * 499 * ANA Group 1 exists without manual intervention, has namespaces assigned to it 500 * by default, and is available in an optimized state through all ports. 501 */ 502 #define NVMET_MAX_ANAGRPS 128 503 #define NVMET_DEFAULT_ANA_GRPID 1 504 505 #define NVMET_KAS 10 506 #define NVMET_DISC_KATO_MS 120000 507 508 int __init nvmet_init_configfs(void); 509 void __exit nvmet_exit_configfs(void); 510 511 int __init nvmet_init_discovery(void); 512 void nvmet_exit_discovery(void); 513 514 extern struct nvmet_subsys *nvmet_disc_subsys; 515 extern struct rw_semaphore nvmet_config_sem; 516 517 extern u32 nvmet_ana_group_enabled[NVMET_MAX_ANAGRPS + 1]; 518 extern u64 nvmet_ana_chgcnt; 519 extern struct rw_semaphore nvmet_ana_sem; 520 521 bool nvmet_host_allowed(struct nvmet_subsys *subsys, const char *hostnqn); 522 523 int nvmet_bdev_ns_enable(struct nvmet_ns *ns); 524 int nvmet_file_ns_enable(struct nvmet_ns *ns); 525 void nvmet_bdev_ns_disable(struct nvmet_ns *ns); 526 void nvmet_file_ns_disable(struct nvmet_ns *ns); 527 u16 nvmet_bdev_flush(struct nvmet_req *req); 528 u16 nvmet_file_flush(struct nvmet_req *req); 529 void nvmet_ns_changed(struct nvmet_subsys *subsys, u32 nsid); 530 void nvmet_bdev_ns_revalidate(struct nvmet_ns *ns); 531 int nvmet_file_ns_revalidate(struct nvmet_ns *ns); 532 void nvmet_ns_revalidate(struct nvmet_ns *ns); 533 534 static inline u32 nvmet_rw_data_len(struct nvmet_req *req) 535 { 536 return ((u32)le16_to_cpu(req->cmd->rw.length) + 1) << 537 req->ns->blksize_shift; 538 } 539 540 static inline u32 nvmet_rw_metadata_len(struct nvmet_req *req) 541 { 542 if (!IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY)) 543 return 0; 544 return ((u32)le16_to_cpu(req->cmd->rw.length) + 1) * 545 req->ns->metadata_size; 546 } 547 548 static inline u32 nvmet_dsm_len(struct nvmet_req *req) 549 { 550 return (le32_to_cpu(req->cmd->dsm.nr) + 1) * 551 sizeof(struct nvme_dsm_range); 552 } 553 554 #ifdef CONFIG_NVME_TARGET_PASSTHRU 555 void nvmet_passthru_subsys_free(struct nvmet_subsys *subsys); 556 int nvmet_passthru_ctrl_enable(struct nvmet_subsys *subsys); 557 void nvmet_passthru_ctrl_disable(struct nvmet_subsys *subsys); 558 u16 nvmet_parse_passthru_admin_cmd(struct nvmet_req *req); 559 u16 nvmet_parse_passthru_io_cmd(struct nvmet_req *req); 560 static inline struct nvme_ctrl *nvmet_passthru_ctrl(struct nvmet_subsys *subsys) 561 { 562 return subsys->passthru_ctrl; 563 } 564 #else /* CONFIG_NVME_TARGET_PASSTHRU */ 565 static inline void nvmet_passthru_subsys_free(struct nvmet_subsys *subsys) 566 { 567 } 568 static inline void nvmet_passthru_ctrl_disable(struct nvmet_subsys *subsys) 569 { 570 } 571 static inline u16 nvmet_parse_passthru_admin_cmd(struct nvmet_req *req) 572 { 573 return 0; 574 } 575 static inline u16 nvmet_parse_passthru_io_cmd(struct nvmet_req *req) 576 { 577 return 0; 578 } 579 static inline struct nvme_ctrl *nvmet_passthru_ctrl(struct nvmet_subsys *subsys) 580 { 581 return NULL; 582 } 583 #endif /* CONFIG_NVME_TARGET_PASSTHRU */ 584 585 static inline struct nvme_ctrl * 586 nvmet_req_passthru_ctrl(struct nvmet_req *req) 587 { 588 return nvmet_passthru_ctrl(req->sq->ctrl->subsys); 589 } 590 591 u16 errno_to_nvme_status(struct nvmet_req *req, int errno); 592 593 /* Convert a 32-bit number to a 16-bit 0's based number */ 594 static inline __le16 to0based(u32 a) 595 { 596 return cpu_to_le16(max(1U, min(1U << 16, a)) - 1); 597 } 598 599 static inline bool nvmet_ns_has_pi(struct nvmet_ns *ns) 600 { 601 if (!IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY)) 602 return false; 603 return ns->pi_type && ns->metadata_size == sizeof(struct t10_pi_tuple); 604 } 605 606 #endif /* _NVMET_H */ 607