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