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 #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 */