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 }; 144 145 static inline struct nvmet_port *to_nvmet_port(struct config_item *item) 146 { 147 return container_of(to_config_group(item), struct nvmet_port, 148 group); 149 } 150 151 static inline struct nvmet_port *ana_groups_to_port( 152 struct config_item *item) 153 { 154 return container_of(to_config_group(item), struct nvmet_port, 155 ana_groups_group); 156 } 157 158 struct nvmet_ctrl { 159 struct nvmet_subsys *subsys; 160 struct nvmet_cq **cqs; 161 struct nvmet_sq **sqs; 162 163 bool cmd_seen; 164 165 struct mutex lock; 166 u64 cap; 167 u32 cc; 168 u32 csts; 169 170 uuid_t hostid; 171 u16 cntlid; 172 u32 kato; 173 174 struct nvmet_port *port; 175 176 u32 aen_enabled; 177 unsigned long aen_masked; 178 struct nvmet_req *async_event_cmds[NVMET_ASYNC_EVENTS]; 179 unsigned int nr_async_event_cmds; 180 struct list_head async_events; 181 struct work_struct async_event_work; 182 183 struct list_head subsys_entry; 184 struct kref ref; 185 struct delayed_work ka_work; 186 struct work_struct fatal_err_work; 187 188 const struct nvmet_fabrics_ops *ops; 189 190 __le32 *changed_ns_list; 191 u32 nr_changed_ns; 192 193 char subsysnqn[NVMF_NQN_FIELD_LEN]; 194 char hostnqn[NVMF_NQN_FIELD_LEN]; 195 196 struct device *p2p_client; 197 struct radix_tree_root p2p_ns_map; 198 199 spinlock_t error_lock; 200 u64 err_counter; 201 struct nvme_error_slot slots[NVMET_ERROR_LOG_SLOTS]; 202 }; 203 204 struct nvmet_subsys { 205 enum nvme_subsys_type type; 206 207 struct mutex lock; 208 struct kref ref; 209 210 struct list_head namespaces; 211 unsigned int nr_namespaces; 212 unsigned int max_nsid; 213 214 struct list_head ctrls; 215 216 struct list_head hosts; 217 bool allow_any_host; 218 219 u16 max_qid; 220 221 u64 ver; 222 u64 serial; 223 char *subsysnqn; 224 225 struct config_group group; 226 227 struct config_group namespaces_group; 228 struct config_group allowed_hosts_group; 229 }; 230 231 static inline struct nvmet_subsys *to_subsys(struct config_item *item) 232 { 233 return container_of(to_config_group(item), struct nvmet_subsys, group); 234 } 235 236 static inline struct nvmet_subsys *namespaces_to_subsys( 237 struct config_item *item) 238 { 239 return container_of(to_config_group(item), struct nvmet_subsys, 240 namespaces_group); 241 } 242 243 struct nvmet_host { 244 struct config_group group; 245 }; 246 247 static inline struct nvmet_host *to_host(struct config_item *item) 248 { 249 return container_of(to_config_group(item), struct nvmet_host, group); 250 } 251 252 static inline char *nvmet_host_name(struct nvmet_host *host) 253 { 254 return config_item_name(&host->group.cg_item); 255 } 256 257 struct nvmet_host_link { 258 struct list_head entry; 259 struct nvmet_host *host; 260 }; 261 262 struct nvmet_subsys_link { 263 struct list_head entry; 264 struct nvmet_subsys *subsys; 265 }; 266 267 struct nvmet_req; 268 struct nvmet_fabrics_ops { 269 struct module *owner; 270 unsigned int type; 271 unsigned int msdbd; 272 bool has_keyed_sgls : 1; 273 void (*queue_response)(struct nvmet_req *req); 274 int (*add_port)(struct nvmet_port *port); 275 void (*remove_port)(struct nvmet_port *port); 276 void (*delete_ctrl)(struct nvmet_ctrl *ctrl); 277 void (*disc_traddr)(struct nvmet_req *req, 278 struct nvmet_port *port, char *traddr); 279 u16 (*install_queue)(struct nvmet_sq *nvme_sq); 280 }; 281 282 #define NVMET_MAX_INLINE_BIOVEC 8 283 #define NVMET_MAX_INLINE_DATA_LEN NVMET_MAX_INLINE_BIOVEC * PAGE_SIZE 284 285 struct nvmet_req { 286 struct nvme_command *cmd; 287 struct nvme_completion *rsp; 288 struct nvmet_sq *sq; 289 struct nvmet_cq *cq; 290 struct nvmet_ns *ns; 291 struct scatterlist *sg; 292 struct bio_vec inline_bvec[NVMET_MAX_INLINE_BIOVEC]; 293 union { 294 struct { 295 struct bio inline_bio; 296 } b; 297 struct { 298 bool mpool_alloc; 299 struct kiocb iocb; 300 struct bio_vec *bvec; 301 struct work_struct work; 302 } f; 303 }; 304 int sg_cnt; 305 /* data length as parsed from the command: */ 306 size_t data_len; 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->rsp->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 u16 nvmet_bdev_parse_io_cmd(struct nvmet_req *req); 367 u16 nvmet_file_parse_io_cmd(struct nvmet_req *req); 368 u16 nvmet_parse_admin_cmd(struct nvmet_req *req); 369 u16 nvmet_parse_discovery_cmd(struct nvmet_req *req); 370 u16 nvmet_parse_fabrics_cmd(struct nvmet_req *req); 371 372 bool nvmet_req_init(struct nvmet_req *req, struct nvmet_cq *cq, 373 struct nvmet_sq *sq, const struct nvmet_fabrics_ops *ops); 374 void nvmet_req_uninit(struct nvmet_req *req); 375 void nvmet_req_execute(struct nvmet_req *req); 376 void nvmet_req_complete(struct nvmet_req *req, u16 status); 377 int nvmet_req_alloc_sgl(struct nvmet_req *req); 378 void nvmet_req_free_sgl(struct nvmet_req *req); 379 380 void nvmet_execute_keep_alive(struct nvmet_req *req); 381 382 void nvmet_cq_setup(struct nvmet_ctrl *ctrl, struct nvmet_cq *cq, u16 qid, 383 u16 size); 384 void nvmet_sq_setup(struct nvmet_ctrl *ctrl, struct nvmet_sq *sq, u16 qid, 385 u16 size); 386 void nvmet_sq_destroy(struct nvmet_sq *sq); 387 int nvmet_sq_init(struct nvmet_sq *sq); 388 389 void nvmet_ctrl_fatal_error(struct nvmet_ctrl *ctrl); 390 391 void nvmet_update_cc(struct nvmet_ctrl *ctrl, u32 new); 392 u16 nvmet_alloc_ctrl(const char *subsysnqn, const char *hostnqn, 393 struct nvmet_req *req, u32 kato, struct nvmet_ctrl **ctrlp); 394 u16 nvmet_ctrl_find_get(const char *subsysnqn, const char *hostnqn, u16 cntlid, 395 struct nvmet_req *req, struct nvmet_ctrl **ret); 396 void nvmet_ctrl_put(struct nvmet_ctrl *ctrl); 397 u16 nvmet_check_ctrl_status(struct nvmet_req *req, struct nvme_command *cmd); 398 399 struct nvmet_subsys *nvmet_subsys_alloc(const char *subsysnqn, 400 enum nvme_subsys_type type); 401 void nvmet_subsys_put(struct nvmet_subsys *subsys); 402 void nvmet_subsys_del_ctrls(struct nvmet_subsys *subsys); 403 404 struct nvmet_ns *nvmet_find_namespace(struct nvmet_ctrl *ctrl, __le32 nsid); 405 void nvmet_put_namespace(struct nvmet_ns *ns); 406 int nvmet_ns_enable(struct nvmet_ns *ns); 407 void nvmet_ns_disable(struct nvmet_ns *ns); 408 struct nvmet_ns *nvmet_ns_alloc(struct nvmet_subsys *subsys, u32 nsid); 409 void nvmet_ns_free(struct nvmet_ns *ns); 410 411 void nvmet_send_ana_event(struct nvmet_subsys *subsys, 412 struct nvmet_port *port); 413 void nvmet_port_send_ana_event(struct nvmet_port *port); 414 415 int nvmet_register_transport(const struct nvmet_fabrics_ops *ops); 416 void nvmet_unregister_transport(const struct nvmet_fabrics_ops *ops); 417 418 int nvmet_enable_port(struct nvmet_port *port); 419 void nvmet_disable_port(struct nvmet_port *port); 420 421 void nvmet_referral_enable(struct nvmet_port *parent, struct nvmet_port *port); 422 void nvmet_referral_disable(struct nvmet_port *parent, struct nvmet_port *port); 423 424 u16 nvmet_copy_to_sgl(struct nvmet_req *req, off_t off, const void *buf, 425 size_t len); 426 u16 nvmet_copy_from_sgl(struct nvmet_req *req, off_t off, void *buf, 427 size_t len); 428 u16 nvmet_zero_sgl(struct nvmet_req *req, off_t off, size_t len); 429 430 u32 nvmet_get_log_page_len(struct nvme_command *cmd); 431 432 extern struct list_head *nvmet_ports; 433 void nvmet_port_disc_changed(struct nvmet_port *port, 434 struct nvmet_subsys *subsys); 435 void nvmet_subsys_disc_changed(struct nvmet_subsys *subsys, 436 struct nvmet_host *host); 437 void nvmet_add_async_event(struct nvmet_ctrl *ctrl, u8 event_type, 438 u8 event_info, u8 log_page); 439 440 #define NVMET_QUEUE_SIZE 1024 441 #define NVMET_NR_QUEUES 128 442 #define NVMET_MAX_CMD NVMET_QUEUE_SIZE 443 444 /* 445 * Nice round number that makes a list of nsids fit into a page. 446 * Should become tunable at some point in the future. 447 */ 448 #define NVMET_MAX_NAMESPACES 1024 449 450 /* 451 * 0 is not a valid ANA group ID, so we start numbering at 1. 452 * 453 * ANA Group 1 exists without manual intervention, has namespaces assigned to it 454 * by default, and is available in an optimized state through all ports. 455 */ 456 #define NVMET_MAX_ANAGRPS 128 457 #define NVMET_DEFAULT_ANA_GRPID 1 458 459 #define NVMET_KAS 10 460 #define NVMET_DISC_KATO_MS 120000 461 462 int __init nvmet_init_configfs(void); 463 void __exit nvmet_exit_configfs(void); 464 465 int __init nvmet_init_discovery(void); 466 void nvmet_exit_discovery(void); 467 468 extern struct nvmet_subsys *nvmet_disc_subsys; 469 extern struct rw_semaphore nvmet_config_sem; 470 471 extern u32 nvmet_ana_group_enabled[NVMET_MAX_ANAGRPS + 1]; 472 extern u64 nvmet_ana_chgcnt; 473 extern struct rw_semaphore nvmet_ana_sem; 474 475 bool nvmet_host_allowed(struct nvmet_subsys *subsys, const char *hostnqn); 476 477 int nvmet_bdev_ns_enable(struct nvmet_ns *ns); 478 int nvmet_file_ns_enable(struct nvmet_ns *ns); 479 void nvmet_bdev_ns_disable(struct nvmet_ns *ns); 480 void nvmet_file_ns_disable(struct nvmet_ns *ns); 481 u16 nvmet_bdev_flush(struct nvmet_req *req); 482 u16 nvmet_file_flush(struct nvmet_req *req); 483 void nvmet_ns_changed(struct nvmet_subsys *subsys, u32 nsid); 484 485 static inline u32 nvmet_rw_len(struct nvmet_req *req) 486 { 487 return ((u32)le16_to_cpu(req->cmd->rw.length) + 1) << 488 req->ns->blksize_shift; 489 } 490 491 u16 errno_to_nvme_status(struct nvmet_req *req, int errno); 492 #endif /* _NVMET_H */ 493