drivers/nvme/target/nvmet.h

   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 command: */
 308         size_t                  data_len;
 309         /* data length as parsed from the SGL descriptor: */
 310         size_t                  transfer_len;
 311
 312         struct nvmet_port       *port;
 313
 314         void (*execute)(struct nvmet_req *req);
 315         const struct nvmet_fabrics_ops *ops;
 316
 317         struct pci_dev          *p2p_dev;
 318         struct device           *p2p_client;
 319         u16                     error_loc;
 320         u64                     error_slba;
 321 };
 322
 323 extern struct workqueue_struct *buffered_io_wq;
 324
 325 static inline void nvmet_set_result(struct nvmet_req *req, u32 result)
 326 {
 327         req->cqe->result.u32 = cpu_to_le32(result);
 328 }
 329
 330 /*
 331  * NVMe command writes actually are DMA reads for us on the target side.
 332  */
 333 static inline enum dma_data_direction
 334 nvmet_data_dir(struct nvmet_req *req)
 335 {
 336         return nvme_is_write(req->cmd) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
 337 }
 338
 339 struct nvmet_async_event {
 340         struct list_head        entry;
 341         u8                      event_type;
 342         u8                      event_info;
 343         u8                      log_page;
 344 };
 345
 346 static inline void nvmet_clear_aen_bit(struct nvmet_req *req, u32 bn)
 347 {
 348         int rae = le32_to_cpu(req->cmd->common.cdw10) & 1 << 15;
 349
 350         if (!rae)
 351                 clear_bit(bn, &req->sq->ctrl->aen_masked);
 352 }
 353
 354 static inline bool nvmet_aen_bit_disabled(struct nvmet_ctrl *ctrl, u32 bn)
 355 {
 356         if (!(READ_ONCE(ctrl->aen_enabled) & (1 << bn)))
 357                 return true;
 358         return test_and_set_bit(bn, &ctrl->aen_masked);
 359 }
 360
 361 void nvmet_get_feat_kato(struct nvmet_req *req);
 362 void nvmet_get_feat_async_event(struct nvmet_req *req);
 363 u16 nvmet_set_feat_kato(struct nvmet_req *req);
 364 u16 nvmet_set_feat_async_event(struct nvmet_req *req, u32 mask);
 365 void nvmet_execute_async_event(struct nvmet_req *req);
 366
 367 u16 nvmet_parse_connect_cmd(struct nvmet_req *req);
 368 void nvmet_bdev_set_limits(struct block_device *bdev, struct nvme_id_ns *id);
 369 u16 nvmet_bdev_parse_io_cmd(struct nvmet_req *req);
 370 u16 nvmet_file_parse_io_cmd(struct nvmet_req *req);
 371 u16 nvmet_parse_admin_cmd(struct nvmet_req *req);
 372 u16 nvmet_parse_discovery_cmd(struct nvmet_req *req);
 373 u16 nvmet_parse_fabrics_cmd(struct nvmet_req *req);
 374
 375 bool nvmet_req_init(struct nvmet_req *req, struct nvmet_cq *cq,
 376                 struct nvmet_sq *sq, const struct nvmet_fabrics_ops *ops);
 377 void nvmet_req_uninit(struct nvmet_req *req);
 378 void nvmet_req_execute(struct nvmet_req *req);
 379 void nvmet_req_complete(struct nvmet_req *req, u16 status);
 380 int nvmet_req_alloc_sgl(struct nvmet_req *req);
 381 void nvmet_req_free_sgl(struct nvmet_req *req);
 382
 383 void nvmet_execute_keep_alive(struct nvmet_req *req);
 384
 385 void nvmet_cq_setup(struct nvmet_ctrl *ctrl, struct nvmet_cq *cq, u16 qid,
 386                 u16 size);
 387 void nvmet_sq_setup(struct nvmet_ctrl *ctrl, struct nvmet_sq *sq, u16 qid,
 388                 u16 size);
 389 void nvmet_sq_destroy(struct nvmet_sq *sq);
 390 int nvmet_sq_init(struct nvmet_sq *sq);
 391
 392 void nvmet_ctrl_fatal_error(struct nvmet_ctrl *ctrl);
 393
 394 void nvmet_update_cc(struct nvmet_ctrl *ctrl, u32 new);
 395 u16 nvmet_alloc_ctrl(const char *subsysnqn, const char *hostnqn,
 396                 struct nvmet_req *req, u32 kato, struct nvmet_ctrl **ctrlp);
 397 u16 nvmet_ctrl_find_get(const char *subsysnqn, const char *hostnqn, u16 cntlid,
 398                 struct nvmet_req *req, struct nvmet_ctrl **ret);
 399 void nvmet_ctrl_put(struct nvmet_ctrl *ctrl);
 400 u16 nvmet_check_ctrl_status(struct nvmet_req *req, struct nvme_command *cmd);
 401
 402 struct nvmet_subsys *nvmet_subsys_alloc(const char *subsysnqn,
 403                 enum nvme_subsys_type type);
 404 void nvmet_subsys_put(struct nvmet_subsys *subsys);
 405 void nvmet_subsys_del_ctrls(struct nvmet_subsys *subsys);
 406
 407 struct nvmet_ns *nvmet_find_namespace(struct nvmet_ctrl *ctrl, __le32 nsid);
 408 void nvmet_put_namespace(struct nvmet_ns *ns);
 409 int nvmet_ns_enable(struct nvmet_ns *ns);
 410 void nvmet_ns_disable(struct nvmet_ns *ns);
 411 struct nvmet_ns *nvmet_ns_alloc(struct nvmet_subsys *subsys, u32 nsid);
 412 void nvmet_ns_free(struct nvmet_ns *ns);
 413
 414 void nvmet_send_ana_event(struct nvmet_subsys *subsys,
 415                 struct nvmet_port *port);
 416 void nvmet_port_send_ana_event(struct nvmet_port *port);
 417
 418 int nvmet_register_transport(const struct nvmet_fabrics_ops *ops);
 419 void nvmet_unregister_transport(const struct nvmet_fabrics_ops *ops);
 420
 421 int nvmet_enable_port(struct nvmet_port *port);
 422 void nvmet_disable_port(struct nvmet_port *port);
 423
 424 void nvmet_referral_enable(struct nvmet_port *parent, struct nvmet_port *port);
 425 void nvmet_referral_disable(struct nvmet_port *parent, struct nvmet_port *port);
 426
 427 u16 nvmet_copy_to_sgl(struct nvmet_req *req, off_t off, const void *buf,
 428                 size_t len);
 429 u16 nvmet_copy_from_sgl(struct nvmet_req *req, off_t off, void *buf,
 430                 size_t len);
 431 u16 nvmet_zero_sgl(struct nvmet_req *req, off_t off, size_t len);
 432
 433 u32 nvmet_get_log_page_len(struct nvme_command *cmd);
 434 u64 nvmet_get_log_page_offset(struct nvme_command *cmd);
 435
 436 extern struct list_head *nvmet_ports;
 437 void nvmet_port_disc_changed(struct nvmet_port *port,
 438                 struct nvmet_subsys *subsys);
 439 void nvmet_subsys_disc_changed(struct nvmet_subsys *subsys,
 440                 struct nvmet_host *host);
 441 void nvmet_add_async_event(struct nvmet_ctrl *ctrl, u8 event_type,
 442                 u8 event_info, u8 log_page);
 443
 444 #define NVMET_QUEUE_SIZE        1024
 445 #define NVMET_NR_QUEUES         128
 446 #define NVMET_MAX_CMD           NVMET_QUEUE_SIZE
 447
 448 /*
 449  * Nice round number that makes a list of nsids fit into a page.
 450  * Should become tunable at some point in the future.
 451  */
 452 #define NVMET_MAX_NAMESPACES    1024
 453
 454 /*
 455  * 0 is not a valid ANA group ID, so we start numbering at 1.
 456  *
 457  * ANA Group 1 exists without manual intervention, has namespaces assigned to it
 458  * by default, and is available in an optimized state through all ports.
 459  */
 460 #define NVMET_MAX_ANAGRPS       128
 461 #define NVMET_DEFAULT_ANA_GRPID 1
 462
 463 #define NVMET_KAS               10
 464 #define NVMET_DISC_KATO_MS              120000
 465
 466 int __init nvmet_init_configfs(void);
 467 void __exit nvmet_exit_configfs(void);
 468
 469 int __init nvmet_init_discovery(void);
 470 void nvmet_exit_discovery(void);
 471
 472 extern struct nvmet_subsys *nvmet_disc_subsys;
 473 extern struct rw_semaphore nvmet_config_sem;
 474
 475 extern u32 nvmet_ana_group_enabled[NVMET_MAX_ANAGRPS + 1];
 476 extern u64 nvmet_ana_chgcnt;
 477 extern struct rw_semaphore nvmet_ana_sem;
 478
 479 bool nvmet_host_allowed(struct nvmet_subsys *subsys, const char *hostnqn);
 480
 481 int nvmet_bdev_ns_enable(struct nvmet_ns *ns);
 482 int nvmet_file_ns_enable(struct nvmet_ns *ns);
 483 void nvmet_bdev_ns_disable(struct nvmet_ns *ns);
 484 void nvmet_file_ns_disable(struct nvmet_ns *ns);
 485 u16 nvmet_bdev_flush(struct nvmet_req *req);
 486 u16 nvmet_file_flush(struct nvmet_req *req);
 487 void nvmet_ns_changed(struct nvmet_subsys *subsys, u32 nsid);
 488
 489 static inline u32 nvmet_rw_len(struct nvmet_req *req)
 490 {
 491         return ((u32)le16_to_cpu(req->cmd->rw.length) + 1) <<
 492                         req->ns->blksize_shift;
 493 }
 494
 495 u16 errno_to_nvme_status(struct nvmet_req *req, int errno);
 496
 497 /* Convert a 32-bit number to a 16-bit 0's based number */
 498 static inline __le16 to0based(u32 a)
 499 {
 500         return cpu_to_le16(max(1U, min(1U << 16, a)) - 1);
 501 }
 502
 503 #endif /* _NVMET_H */