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 #define NVMET_MN_MAX_SIZE 40 31 #define NVMET_SN_MAX_SIZE 20 32 33 /* 34 * Supported optional AENs: 35 */ 36 #define NVMET_AEN_CFG_OPTIONAL \ 37 (NVME_AEN_CFG_NS_ATTR | NVME_AEN_CFG_ANA_CHANGE) 38 #define NVMET_DISC_AEN_CFG_OPTIONAL \ 39 (NVME_AEN_CFG_DISC_CHANGE) 40 41 /* 42 * Plus mandatory SMART AENs (we'll never send them, but allow enabling them): 43 */ 44 #define NVMET_AEN_CFG_ALL \ 45 (NVME_SMART_CRIT_SPARE | NVME_SMART_CRIT_TEMPERATURE | \ 46 NVME_SMART_CRIT_RELIABILITY | NVME_SMART_CRIT_MEDIA | \ 47 NVME_SMART_CRIT_VOLATILE_MEMORY | NVMET_AEN_CFG_OPTIONAL) 48 49 /* Helper Macros when NVMe error is NVME_SC_CONNECT_INVALID_PARAM 50 * The 16 bit shift is to set IATTR bit to 1, which means offending 51 * offset starts in the data section of connect() 52 */ 53 #define IPO_IATTR_CONNECT_DATA(x) \ 54 (cpu_to_le32((1 << 16) | (offsetof(struct nvmf_connect_data, x)))) 55 #define IPO_IATTR_CONNECT_SQE(x) \ 56 (cpu_to_le32(offsetof(struct nvmf_connect_command, x))) 57 58 struct nvmet_ns { 59 struct percpu_ref ref; 60 struct block_device *bdev; 61 struct file *file; 62 bool readonly; 63 u32 nsid; 64 u32 blksize_shift; 65 loff_t size; 66 u8 nguid[16]; 67 uuid_t uuid; 68 u32 anagrpid; 69 70 bool buffered_io; 71 bool enabled; 72 struct nvmet_subsys *subsys; 73 const char *device_path; 74 75 struct config_group device_group; 76 struct config_group group; 77 78 struct completion disable_done; 79 mempool_t *bvec_pool; 80 struct kmem_cache *bvec_cache; 81 82 int use_p2pmem; 83 struct pci_dev *p2p_dev; 84 int pi_type; 85 int metadata_size; 86 u8 csi; 87 }; 88 89 static inline struct nvmet_ns *to_nvmet_ns(struct config_item *item) 90 { 91 return container_of(to_config_group(item), struct nvmet_ns, group); 92 } 93 94 static inline struct device *nvmet_ns_dev(struct nvmet_ns *ns) 95 { 96 return ns->bdev ? disk_to_dev(ns->bdev->bd_disk) : NULL; 97 } 98 99 struct nvmet_cq { 100 u16 qid; 101 u16 size; 102 }; 103 104 struct nvmet_sq { 105 struct nvmet_ctrl *ctrl; 106 struct percpu_ref ref; 107 u16 qid; 108 u16 size; 109 u32 sqhd; 110 bool sqhd_disabled; 111 struct completion free_done; 112 struct completion confirm_done; 113 }; 114 115 struct nvmet_ana_group { 116 struct config_group group; 117 struct nvmet_port *port; 118 u32 grpid; 119 }; 120 121 static inline struct nvmet_ana_group *to_ana_group(struct config_item *item) 122 { 123 return container_of(to_config_group(item), struct nvmet_ana_group, 124 group); 125 } 126 127 /** 128 * struct nvmet_port - Common structure to keep port 129 * information for the target. 130 * @entry: Entry into referrals or transport list. 131 * @disc_addr: Address information is stored in a format defined 132 * for a discovery log page entry. 133 * @group: ConfigFS group for this element's folder. 134 * @priv: Private data for the transport. 135 */ 136 struct nvmet_port { 137 struct list_head entry; 138 struct nvmf_disc_rsp_page_entry disc_addr; 139 struct config_group group; 140 struct config_group subsys_group; 141 struct list_head subsystems; 142 struct config_group referrals_group; 143 struct list_head referrals; 144 struct list_head global_entry; 145 struct config_group ana_groups_group; 146 struct nvmet_ana_group ana_default_group; 147 enum nvme_ana_state *ana_state; 148 void *priv; 149 bool enabled; 150 int inline_data_size; 151 const struct nvmet_fabrics_ops *tr_ops; 152 bool pi_enable; 153 }; 154 155 static inline struct nvmet_port *to_nvmet_port(struct config_item *item) 156 { 157 return container_of(to_config_group(item), struct nvmet_port, 158 group); 159 } 160 161 static inline struct nvmet_port *ana_groups_to_port( 162 struct config_item *item) 163 { 164 return container_of(to_config_group(item), struct nvmet_port, 165 ana_groups_group); 166 } 167 168 struct nvmet_ctrl { 169 struct nvmet_subsys *subsys; 170 struct nvmet_sq **sqs; 171 172 bool reset_tbkas; 173 174 struct mutex lock; 175 u64 cap; 176 u32 cc; 177 u32 csts; 178 179 uuid_t hostid; 180 u16 cntlid; 181 u32 kato; 182 183 struct nvmet_port *port; 184 185 u32 aen_enabled; 186 unsigned long aen_masked; 187 struct nvmet_req *async_event_cmds[NVMET_ASYNC_EVENTS]; 188 unsigned int nr_async_event_cmds; 189 struct list_head async_events; 190 struct work_struct async_event_work; 191 192 struct list_head subsys_entry; 193 struct kref ref; 194 struct delayed_work ka_work; 195 struct work_struct fatal_err_work; 196 197 const struct nvmet_fabrics_ops *ops; 198 199 __le32 *changed_ns_list; 200 u32 nr_changed_ns; 201 202 char subsysnqn[NVMF_NQN_FIELD_LEN]; 203 char hostnqn[NVMF_NQN_FIELD_LEN]; 204 205 struct device *p2p_client; 206 struct radix_tree_root p2p_ns_map; 207 208 spinlock_t error_lock; 209 u64 err_counter; 210 struct nvme_error_slot slots[NVMET_ERROR_LOG_SLOTS]; 211 bool pi_support; 212 }; 213 214 struct nvmet_subsys { 215 enum nvme_subsys_type type; 216 217 struct mutex lock; 218 struct kref ref; 219 220 struct xarray namespaces; 221 unsigned int nr_namespaces; 222 u32 max_nsid; 223 u16 cntlid_min; 224 u16 cntlid_max; 225 226 struct list_head ctrls; 227 228 struct list_head hosts; 229 bool allow_any_host; 230 231 u16 max_qid; 232 233 u64 ver; 234 char serial[NVMET_SN_MAX_SIZE]; 235 bool subsys_discovered; 236 char *subsysnqn; 237 bool pi_support; 238 239 struct config_group group; 240 241 struct config_group namespaces_group; 242 struct config_group allowed_hosts_group; 243 244 char *model_number; 245 246 #ifdef CONFIG_NVME_TARGET_PASSTHRU 247 struct nvme_ctrl *passthru_ctrl; 248 char *passthru_ctrl_path; 249 struct config_group passthru_group; 250 unsigned int admin_timeout; 251 unsigned int io_timeout; 252 #endif /* CONFIG_NVME_TARGET_PASSTHRU */ 253 254 #ifdef CONFIG_BLK_DEV_ZONED 255 u8 zasl; 256 #endif /* CONFIG_BLK_DEV_ZONED */ 257 }; 258 259 static inline struct nvmet_subsys *to_subsys(struct config_item *item) 260 { 261 return container_of(to_config_group(item), struct nvmet_subsys, group); 262 } 263 264 static inline struct nvmet_subsys *namespaces_to_subsys( 265 struct config_item *item) 266 { 267 return container_of(to_config_group(item), struct nvmet_subsys, 268 namespaces_group); 269 } 270 271 struct nvmet_host { 272 struct config_group group; 273 }; 274 275 static inline struct nvmet_host *to_host(struct config_item *item) 276 { 277 return container_of(to_config_group(item), struct nvmet_host, group); 278 } 279 280 static inline char *nvmet_host_name(struct nvmet_host *host) 281 { 282 return config_item_name(&host->group.cg_item); 283 } 284 285 struct nvmet_host_link { 286 struct list_head entry; 287 struct nvmet_host *host; 288 }; 289 290 struct nvmet_subsys_link { 291 struct list_head entry; 292 struct nvmet_subsys *subsys; 293 }; 294 295 struct nvmet_req; 296 struct nvmet_fabrics_ops { 297 struct module *owner; 298 unsigned int type; 299 unsigned int msdbd; 300 unsigned int flags; 301 #define NVMF_KEYED_SGLS (1 << 0) 302 #define NVMF_METADATA_SUPPORTED (1 << 1) 303 void (*queue_response)(struct nvmet_req *req); 304 int (*add_port)(struct nvmet_port *port); 305 void (*remove_port)(struct nvmet_port *port); 306 void (*delete_ctrl)(struct nvmet_ctrl *ctrl); 307 void (*disc_traddr)(struct nvmet_req *req, 308 struct nvmet_port *port, char *traddr); 309 u16 (*install_queue)(struct nvmet_sq *nvme_sq); 310 void (*discovery_chg)(struct nvmet_port *port); 311 u8 (*get_mdts)(const struct nvmet_ctrl *ctrl); 312 u16 (*get_max_queue_size)(const struct nvmet_ctrl *ctrl); 313 }; 314 315 #define NVMET_MAX_INLINE_BIOVEC 8 316 #define NVMET_MAX_INLINE_DATA_LEN NVMET_MAX_INLINE_BIOVEC * PAGE_SIZE 317 318 struct nvmet_req { 319 struct nvme_command *cmd; 320 struct nvme_completion *cqe; 321 struct nvmet_sq *sq; 322 struct nvmet_cq *cq; 323 struct nvmet_ns *ns; 324 struct scatterlist *sg; 325 struct scatterlist *metadata_sg; 326 struct bio_vec inline_bvec[NVMET_MAX_INLINE_BIOVEC]; 327 union { 328 struct { 329 struct bio inline_bio; 330 } b; 331 struct { 332 bool mpool_alloc; 333 struct kiocb iocb; 334 struct bio_vec *bvec; 335 struct work_struct work; 336 } f; 337 struct { 338 struct bio inline_bio; 339 struct request *rq; 340 struct work_struct work; 341 bool use_workqueue; 342 } p; 343 #ifdef CONFIG_BLK_DEV_ZONED 344 struct { 345 struct bio inline_bio; 346 struct work_struct zmgmt_work; 347 } z; 348 #endif /* CONFIG_BLK_DEV_ZONED */ 349 }; 350 int sg_cnt; 351 int metadata_sg_cnt; 352 /* data length as parsed from the SGL descriptor: */ 353 size_t transfer_len; 354 size_t metadata_len; 355 356 struct nvmet_port *port; 357 358 void (*execute)(struct nvmet_req *req); 359 const struct nvmet_fabrics_ops *ops; 360 361 struct pci_dev *p2p_dev; 362 struct device *p2p_client; 363 u16 error_loc; 364 u64 error_slba; 365 }; 366 367 extern struct workqueue_struct *buffered_io_wq; 368 extern struct workqueue_struct *zbd_wq; 369 extern struct workqueue_struct *nvmet_wq; 370 371 static inline void nvmet_set_result(struct nvmet_req *req, u32 result) 372 { 373 req->cqe->result.u32 = cpu_to_le32(result); 374 } 375 376 /* 377 * NVMe command writes actually are DMA reads for us on the target side. 378 */ 379 static inline enum dma_data_direction 380 nvmet_data_dir(struct nvmet_req *req) 381 { 382 return nvme_is_write(req->cmd) ? DMA_FROM_DEVICE : DMA_TO_DEVICE; 383 } 384 385 struct nvmet_async_event { 386 struct list_head entry; 387 u8 event_type; 388 u8 event_info; 389 u8 log_page; 390 }; 391 392 static inline void nvmet_clear_aen_bit(struct nvmet_req *req, u32 bn) 393 { 394 int rae = le32_to_cpu(req->cmd->common.cdw10) & 1 << 15; 395 396 if (!rae) 397 clear_bit(bn, &req->sq->ctrl->aen_masked); 398 } 399 400 static inline bool nvmet_aen_bit_disabled(struct nvmet_ctrl *ctrl, u32 bn) 401 { 402 if (!(READ_ONCE(ctrl->aen_enabled) & (1 << bn))) 403 return true; 404 return test_and_set_bit(bn, &ctrl->aen_masked); 405 } 406 407 void nvmet_get_feat_kato(struct nvmet_req *req); 408 void nvmet_get_feat_async_event(struct nvmet_req *req); 409 u16 nvmet_set_feat_kato(struct nvmet_req *req); 410 u16 nvmet_set_feat_async_event(struct nvmet_req *req, u32 mask); 411 void nvmet_execute_async_event(struct nvmet_req *req); 412 void nvmet_start_keep_alive_timer(struct nvmet_ctrl *ctrl); 413 void nvmet_stop_keep_alive_timer(struct nvmet_ctrl *ctrl); 414 415 u16 nvmet_parse_connect_cmd(struct nvmet_req *req); 416 void nvmet_bdev_set_limits(struct block_device *bdev, struct nvme_id_ns *id); 417 u16 nvmet_bdev_parse_io_cmd(struct nvmet_req *req); 418 u16 nvmet_file_parse_io_cmd(struct nvmet_req *req); 419 u16 nvmet_bdev_zns_parse_io_cmd(struct nvmet_req *req); 420 u16 nvmet_parse_admin_cmd(struct nvmet_req *req); 421 u16 nvmet_parse_discovery_cmd(struct nvmet_req *req); 422 u16 nvmet_parse_fabrics_cmd(struct nvmet_req *req); 423 424 bool nvmet_req_init(struct nvmet_req *req, struct nvmet_cq *cq, 425 struct nvmet_sq *sq, const struct nvmet_fabrics_ops *ops); 426 void nvmet_req_uninit(struct nvmet_req *req); 427 bool nvmet_check_transfer_len(struct nvmet_req *req, size_t len); 428 bool nvmet_check_data_len_lte(struct nvmet_req *req, size_t data_len); 429 void nvmet_req_complete(struct nvmet_req *req, u16 status); 430 int nvmet_req_alloc_sgls(struct nvmet_req *req); 431 void nvmet_req_free_sgls(struct nvmet_req *req); 432 433 void nvmet_execute_set_features(struct nvmet_req *req); 434 void nvmet_execute_get_features(struct nvmet_req *req); 435 void nvmet_execute_keep_alive(struct nvmet_req *req); 436 437 void nvmet_cq_setup(struct nvmet_ctrl *ctrl, struct nvmet_cq *cq, u16 qid, 438 u16 size); 439 void nvmet_sq_setup(struct nvmet_ctrl *ctrl, struct nvmet_sq *sq, u16 qid, 440 u16 size); 441 void nvmet_sq_destroy(struct nvmet_sq *sq); 442 int nvmet_sq_init(struct nvmet_sq *sq); 443 444 void nvmet_ctrl_fatal_error(struct nvmet_ctrl *ctrl); 445 446 void nvmet_update_cc(struct nvmet_ctrl *ctrl, u32 new); 447 u16 nvmet_alloc_ctrl(const char *subsysnqn, const char *hostnqn, 448 struct nvmet_req *req, u32 kato, struct nvmet_ctrl **ctrlp); 449 struct nvmet_ctrl *nvmet_ctrl_find_get(const char *subsysnqn, 450 const char *hostnqn, u16 cntlid, 451 struct nvmet_req *req); 452 void nvmet_ctrl_put(struct nvmet_ctrl *ctrl); 453 u16 nvmet_check_ctrl_status(struct nvmet_req *req); 454 455 struct nvmet_subsys *nvmet_subsys_alloc(const char *subsysnqn, 456 enum nvme_subsys_type type); 457 void nvmet_subsys_put(struct nvmet_subsys *subsys); 458 void nvmet_subsys_del_ctrls(struct nvmet_subsys *subsys); 459 460 u16 nvmet_req_find_ns(struct nvmet_req *req); 461 void nvmet_put_namespace(struct nvmet_ns *ns); 462 int nvmet_ns_enable(struct nvmet_ns *ns); 463 void nvmet_ns_disable(struct nvmet_ns *ns); 464 struct nvmet_ns *nvmet_ns_alloc(struct nvmet_subsys *subsys, u32 nsid); 465 void nvmet_ns_free(struct nvmet_ns *ns); 466 467 void nvmet_send_ana_event(struct nvmet_subsys *subsys, 468 struct nvmet_port *port); 469 void nvmet_port_send_ana_event(struct nvmet_port *port); 470 471 int nvmet_register_transport(const struct nvmet_fabrics_ops *ops); 472 void nvmet_unregister_transport(const struct nvmet_fabrics_ops *ops); 473 474 void nvmet_port_del_ctrls(struct nvmet_port *port, 475 struct nvmet_subsys *subsys); 476 477 int nvmet_enable_port(struct nvmet_port *port); 478 void nvmet_disable_port(struct nvmet_port *port); 479 480 void nvmet_referral_enable(struct nvmet_port *parent, struct nvmet_port *port); 481 void nvmet_referral_disable(struct nvmet_port *parent, struct nvmet_port *port); 482 483 u16 nvmet_copy_to_sgl(struct nvmet_req *req, off_t off, const void *buf, 484 size_t len); 485 u16 nvmet_copy_from_sgl(struct nvmet_req *req, off_t off, void *buf, 486 size_t len); 487 u16 nvmet_zero_sgl(struct nvmet_req *req, off_t off, size_t len); 488 489 u32 nvmet_get_log_page_len(struct nvme_command *cmd); 490 u64 nvmet_get_log_page_offset(struct nvme_command *cmd); 491 492 extern struct list_head *nvmet_ports; 493 void nvmet_port_disc_changed(struct nvmet_port *port, 494 struct nvmet_subsys *subsys); 495 void nvmet_subsys_disc_changed(struct nvmet_subsys *subsys, 496 struct nvmet_host *host); 497 void nvmet_add_async_event(struct nvmet_ctrl *ctrl, u8 event_type, 498 u8 event_info, u8 log_page); 499 500 #define NVMET_QUEUE_SIZE 1024 501 #define NVMET_NR_QUEUES 128 502 #define NVMET_MAX_CMD NVMET_QUEUE_SIZE 503 504 /* 505 * Nice round number that makes a list of nsids fit into a page. 506 * Should become tunable at some point in the future. 507 */ 508 #define NVMET_MAX_NAMESPACES 1024 509 510 /* 511 * 0 is not a valid ANA group ID, so we start numbering at 1. 512 * 513 * ANA Group 1 exists without manual intervention, has namespaces assigned to it 514 * by default, and is available in an optimized state through all ports. 515 */ 516 #define NVMET_MAX_ANAGRPS 128 517 #define NVMET_DEFAULT_ANA_GRPID 1 518 519 #define NVMET_KAS 10 520 #define NVMET_DISC_KATO_MS 120000 521 522 int __init nvmet_init_configfs(void); 523 void __exit nvmet_exit_configfs(void); 524 525 int __init nvmet_init_discovery(void); 526 void nvmet_exit_discovery(void); 527 528 extern struct nvmet_subsys *nvmet_disc_subsys; 529 extern struct rw_semaphore nvmet_config_sem; 530 531 extern u32 nvmet_ana_group_enabled[NVMET_MAX_ANAGRPS + 1]; 532 extern u64 nvmet_ana_chgcnt; 533 extern struct rw_semaphore nvmet_ana_sem; 534 535 bool nvmet_host_allowed(struct nvmet_subsys *subsys, const char *hostnqn); 536 537 int nvmet_bdev_ns_enable(struct nvmet_ns *ns); 538 int nvmet_file_ns_enable(struct nvmet_ns *ns); 539 void nvmet_bdev_ns_disable(struct nvmet_ns *ns); 540 void nvmet_file_ns_disable(struct nvmet_ns *ns); 541 u16 nvmet_bdev_flush(struct nvmet_req *req); 542 u16 nvmet_file_flush(struct nvmet_req *req); 543 void nvmet_ns_changed(struct nvmet_subsys *subsys, u32 nsid); 544 void nvmet_bdev_ns_revalidate(struct nvmet_ns *ns); 545 void nvmet_file_ns_revalidate(struct nvmet_ns *ns); 546 bool nvmet_ns_revalidate(struct nvmet_ns *ns); 547 u16 blk_to_nvme_status(struct nvmet_req *req, blk_status_t blk_sts); 548 549 bool nvmet_bdev_zns_enable(struct nvmet_ns *ns); 550 void nvmet_execute_identify_cns_cs_ctrl(struct nvmet_req *req); 551 void nvmet_execute_identify_cns_cs_ns(struct nvmet_req *req); 552 void nvmet_bdev_execute_zone_mgmt_recv(struct nvmet_req *req); 553 void nvmet_bdev_execute_zone_mgmt_send(struct nvmet_req *req); 554 void nvmet_bdev_execute_zone_append(struct nvmet_req *req); 555 556 static inline u32 nvmet_rw_data_len(struct nvmet_req *req) 557 { 558 return ((u32)le16_to_cpu(req->cmd->rw.length) + 1) << 559 req->ns->blksize_shift; 560 } 561 562 static inline u32 nvmet_rw_metadata_len(struct nvmet_req *req) 563 { 564 if (!IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY)) 565 return 0; 566 return ((u32)le16_to_cpu(req->cmd->rw.length) + 1) * 567 req->ns->metadata_size; 568 } 569 570 static inline u32 nvmet_dsm_len(struct nvmet_req *req) 571 { 572 return (le32_to_cpu(req->cmd->dsm.nr) + 1) * 573 sizeof(struct nvme_dsm_range); 574 } 575 576 static inline struct nvmet_subsys *nvmet_req_subsys(struct nvmet_req *req) 577 { 578 return req->sq->ctrl->subsys; 579 } 580 581 static inline bool nvmet_is_disc_subsys(struct nvmet_subsys *subsys) 582 { 583 return subsys->type != NVME_NQN_NVME; 584 } 585 586 #ifdef CONFIG_NVME_TARGET_PASSTHRU 587 void nvmet_passthru_subsys_free(struct nvmet_subsys *subsys); 588 int nvmet_passthru_ctrl_enable(struct nvmet_subsys *subsys); 589 void nvmet_passthru_ctrl_disable(struct nvmet_subsys *subsys); 590 u16 nvmet_parse_passthru_admin_cmd(struct nvmet_req *req); 591 u16 nvmet_parse_passthru_io_cmd(struct nvmet_req *req); 592 static inline bool nvmet_is_passthru_subsys(struct nvmet_subsys *subsys) 593 { 594 return subsys->passthru_ctrl; 595 } 596 #else /* CONFIG_NVME_TARGET_PASSTHRU */ 597 static inline void nvmet_passthru_subsys_free(struct nvmet_subsys *subsys) 598 { 599 } 600 static inline void nvmet_passthru_ctrl_disable(struct nvmet_subsys *subsys) 601 { 602 } 603 static inline u16 nvmet_parse_passthru_admin_cmd(struct nvmet_req *req) 604 { 605 return 0; 606 } 607 static inline u16 nvmet_parse_passthru_io_cmd(struct nvmet_req *req) 608 { 609 return 0; 610 } 611 static inline bool nvmet_is_passthru_subsys(struct nvmet_subsys *subsys) 612 { 613 return NULL; 614 } 615 #endif /* CONFIG_NVME_TARGET_PASSTHRU */ 616 617 static inline bool nvmet_is_passthru_req(struct nvmet_req *req) 618 { 619 return nvmet_is_passthru_subsys(nvmet_req_subsys(req)); 620 } 621 622 void nvmet_passthrough_override_cap(struct nvmet_ctrl *ctrl); 623 624 u16 errno_to_nvme_status(struct nvmet_req *req, int errno); 625 u16 nvmet_report_invalid_opcode(struct nvmet_req *req); 626 627 /* Convert a 32-bit number to a 16-bit 0's based number */ 628 static inline __le16 to0based(u32 a) 629 { 630 return cpu_to_le16(max(1U, min(1U << 16, a)) - 1); 631 } 632 633 static inline bool nvmet_ns_has_pi(struct nvmet_ns *ns) 634 { 635 if (!IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY)) 636 return false; 637 return ns->pi_type && ns->metadata_size == sizeof(struct t10_pi_tuple); 638 } 639 640 static inline __le64 nvmet_sect_to_lba(struct nvmet_ns *ns, sector_t sect) 641 { 642 return cpu_to_le64(sect >> (ns->blksize_shift - SECTOR_SHIFT)); 643 } 644 645 static inline sector_t nvmet_lba_to_sect(struct nvmet_ns *ns, __le64 lba) 646 { 647 return le64_to_cpu(lba) << (ns->blksize_shift - SECTOR_SHIFT); 648 } 649 650 static inline bool nvmet_use_inline_bvec(struct nvmet_req *req) 651 { 652 return req->transfer_len <= NVMET_MAX_INLINE_DATA_LEN && 653 req->sg_cnt <= NVMET_MAX_INLINE_BIOVEC; 654 } 655 656 static inline void nvmet_req_cns_error_complete(struct nvmet_req *req) 657 { 658 pr_debug("unhandled identify cns %d on qid %d\n", 659 req->cmd->identify.cns, req->sq->qid); 660 req->error_loc = offsetof(struct nvme_identify, cns); 661 nvmet_req_complete(req, NVME_SC_INVALID_FIELD | NVME_SC_DNR); 662 } 663 664 static inline void nvmet_req_bio_put(struct nvmet_req *req, struct bio *bio) 665 { 666 if (bio != &req->b.inline_bio) 667 bio_put(bio); 668 } 669 670 #endif /* _NVMET_H */ 671