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/* SPDX-License-Identifier: GPL-2.0 */
* Copyright (c) 2015-2016 HGST, a Western Digital Company.
#ifndef _NVMET_H
#define _NVMET_H
#include <linux/dma-mapping.h>
#include <linux/types.h>
#include <linux/device.h>
#include <linux/kref.h>
#include <linux/percpu-refcount.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/uuid.h>
#include <linux/nvme.h>
#include <linux/configfs.h>
#include <linux/rcupdate.h>
#include <linux/blkdev.h>
#include <linux/radix-tree.h>
#define NVMET_NO_ERROR_LOC ((u16)-1)
* Supported optional AENs:
* Plus mandatory SMART AENs (we'll never send them, but allow enabling them):
/* Helper Macros when NVMe error is NVME_SC_CONNECT_INVALID_PARAM
* The 16 bit shift is to set IATTR bit to 1, which means offending
* offset starts in the data section of connect()
(cpu_to_le32((1 << 16) | (offsetof(struct nvmf_connect_data, x))))
(cpu_to_le32(offsetof(struct nvmf_connect_command, x)))
struct nvmet_ns {
struct list_head dev_link;
struct percpu_ref ref;
struct block_device *bdev;
struct file *file;
bool readonly;
u32 nsid;
u32 blksize_shift;
loff_t size;
u8 nguid[16];
uuid_t uuid;
u32 anagrpid;
bool buffered_io;
bool enabled;
struct nvmet_subsys *subsys;
const char *device_path;
struct config_group device_group;
struct config_group group;
struct completion disable_done;
mempool_t *bvec_pool;
struct kmem_cache *bvec_cache;
int use_p2pmem;
struct pci_dev *p2p_dev;
static inline struct nvmet_ns *to_nvmet_ns(struct config_item *item)
return container_of(to_config_group(item), struct nvmet_ns, group);
static inline struct device *nvmet_ns_dev(struct nvmet_ns *ns)
return ns->bdev ? disk_to_dev(ns->bdev->bd_disk) : NULL;
struct nvmet_cq {
u16 qid;
u16 size;
struct nvmet_sq {
struct nvmet_ctrl *ctrl;
struct percpu_ref ref;
u16 qid;
u16 size;
u32 sqhd;
bool sqhd_disabled;
struct completion free_done;
struct completion confirm_done;
struct nvmet_ana_group {
struct config_group group;
struct nvmet_port *port;
u32 grpid;
static inline struct nvmet_ana_group *to_ana_group(struct config_item *item)
return container_of(to_config_group(item), struct nvmet_ana_group,
* struct nvmet_port - Common structure to keep port
* information for the target.
* @entry: Entry into referrals or transport list.
* @disc_addr: Address information is stored in a format defined
* for a discovery log page entry.
* @group: ConfigFS group for this element's folder.
* @priv: Private data for the transport.
struct nvmet_port {
struct list_head entry;
struct nvmf_disc_rsp_page_entry disc_addr;
struct config_group group;
struct config_group subsys_group;
struct list_head subsystems;
struct config_group referrals_group;
struct list_head referrals;
struct list_head global_entry;
struct config_group ana_groups_group;
struct nvmet_ana_group ana_default_group;
enum nvme_ana_state *ana_state;
void *priv;
bool enabled;
int inline_data_size;
const struct nvmet_fabrics_ops *tr_ops;
static inline struct nvmet_port *to_nvmet_port(struct config_item *item)
return container_of(to_config_group(item), struct nvmet_port,
static inline struct nvmet_port *ana_groups_to_port(
struct config_item *item)
return container_of(to_config_group(item), struct nvmet_port,
struct nvmet_ctrl {
struct nvmet_subsys *subsys;
struct nvmet_cq **cqs;
struct nvmet_sq **sqs;
bool cmd_seen;
struct mutex lock;
u64 cap;
u32 cc;
u32 csts;
uuid_t hostid;
u16 cntlid;
u32 kato;
struct nvmet_port *port;
u32 aen_enabled;
unsigned long aen_masked;
struct nvmet_req *async_event_cmds[NVMET_ASYNC_EVENTS];
unsigned int nr_async_event_cmds;
struct list_head async_events;
struct work_struct async_event_work;
struct list_head subsys_entry;
struct kref ref;
struct delayed_work ka_work;
struct work_struct fatal_err_work;
const struct nvmet_fabrics_ops *ops;
__le32 *changed_ns_list;
u32 nr_changed_ns;
char subsysnqn[NVMF_NQN_FIELD_LEN];
char hostnqn[NVMF_NQN_FIELD_LEN];
struct device *p2p_client;
struct radix_tree_root p2p_ns_map;
spinlock_t error_lock;
u64 err_counter;
struct nvme_error_slot slots[NVMET_ERROR_LOG_SLOTS];
struct nvmet_subsys {
enum nvme_subsys_type type;
struct mutex lock;
struct kref ref;
struct list_head namespaces;
unsigned int nr_namespaces;
unsigned int max_nsid;
struct list_head ctrls;
struct list_head hosts;
bool allow_any_host;
u16 max_qid;
u64 ver;
u64 serial;
char *subsysnqn;
struct config_group group;
struct config_group namespaces_group;
struct config_group allowed_hosts_group;
static inline struct nvmet_subsys *to_subsys(struct config_item *item)
return container_of(to_config_group(item), struct nvmet_subsys, group);
static inline struct nvmet_subsys *namespaces_to_subsys(
struct config_item *item)
return container_of(to_config_group(item), struct nvmet_subsys,
struct nvmet_host {
struct config_group group;
static inline struct nvmet_host *to_host(struct config_item *item)
return container_of(to_config_group(item), struct nvmet_host, group);
static inline char *nvmet_host_name(struct nvmet_host *host)
return config_item_name(&host->group.cg_item);
struct nvmet_host_link {
struct list_head entry;
struct nvmet_host *host;
struct nvmet_subsys_link {
struct list_head entry;
struct nvmet_subsys *subsys;
struct nvmet_req;
struct nvmet_fabrics_ops {
struct module *owner;
unsigned int type;
unsigned int msdbd;
bool has_keyed_sgls : 1;
void (*queue_response)(struct nvmet_req *req);
int (*add_port)(struct nvmet_port *port);
void (*remove_port)(struct nvmet_port *port);
void (*delete_ctrl)(struct nvmet_ctrl *ctrl);
void (*disc_traddr)(struct nvmet_req *req,
struct nvmet_port *port, char *traddr);
u16 (*install_queue)(struct nvmet_sq *nvme_sq);
void (*discovery_chg)(struct nvmet_port *port);
struct nvmet_req {
struct nvme_command *cmd;
struct nvme_completion *cqe;
struct nvmet_sq *sq;
struct nvmet_cq *cq;
struct nvmet_ns *ns;
struct scatterlist *sg;
struct bio_vec inline_bvec[NVMET_MAX_INLINE_BIOVEC];
union {
struct {
struct bio inline_bio;
} b;
struct {
bool mpool_alloc;
struct kiocb iocb;
struct bio_vec *bvec;
struct work_struct work;
} f;
int sg_cnt;
/* data length as parsed from the SGL descriptor: */
size_t transfer_len;
struct nvmet_port *port;
void (*execute)(struct nvmet_req *req);
const struct nvmet_fabrics_ops *ops;
struct pci_dev *p2p_dev;
struct device *p2p_client;
u16 error_loc;
u64 error_slba;
extern struct workqueue_struct *buffered_io_wq;
static inline void nvmet_set_result(struct nvmet_req *req, u32 result)
req->cqe->result.u32 = cpu_to_le32(result);
* NVMe command writes actually are DMA reads for us on the target side.
static inline enum dma_data_direction
nvmet_data_dir(struct nvmet_req *req)
return nvme_is_write(req->cmd) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
struct nvmet_async_event {
struct list_head entry;
u8 event_type;
u8 event_info;
u8 log_page;
static inline void nvmet_clear_aen_bit(struct nvmet_req *req, u32 bn)
int rae = le32_to_cpu(req->cmd->common.cdw10) & 1 << 15;
if (!rae)
clear_bit(bn, &req->sq->ctrl->aen_masked);
static inline bool nvmet_aen_bit_disabled(struct nvmet_ctrl *ctrl, u32 bn)
if (!(READ_ONCE(ctrl->aen_enabled) & (1 << bn)))
return true;
return test_and_set_bit(bn, &ctrl->aen_masked);
void nvmet_get_feat_kato(struct nvmet_req *req);
void nvmet_get_feat_async_event(struct nvmet_req *req);
u16 nvmet_set_feat_kato(struct nvmet_req *req);
u16 nvmet_set_feat_async_event(struct nvmet_req *req, u32 mask);
void nvmet_execute_async_event(struct nvmet_req *req);
u16 nvmet_parse_connect_cmd(struct nvmet_req *req);
void nvmet_bdev_set_limits(struct block_device *bdev, struct nvme_id_ns *id);
u16 nvmet_bdev_parse_io_cmd(struct nvmet_req *req);
u16 nvmet_file_parse_io_cmd(struct nvmet_req *req);
u16 nvmet_parse_admin_cmd(struct nvmet_req *req);
u16 nvmet_parse_discovery_cmd(struct nvmet_req *req);
u16 nvmet_parse_fabrics_cmd(struct nvmet_req *req);
bool nvmet_req_init(struct nvmet_req *req, struct nvmet_cq *cq,
struct nvmet_sq *sq, const struct nvmet_fabrics_ops *ops);
void nvmet_req_uninit(struct nvmet_req *req);
bool nvmet_check_data_len(struct nvmet_req *req, size_t data_len);
void nvmet_req_complete(struct nvmet_req *req, u16 status);
int nvmet_req_alloc_sgl(struct nvmet_req *req);
void nvmet_req_free_sgl(struct nvmet_req *req);
void nvmet_execute_keep_alive(struct nvmet_req *req);
void nvmet_cq_setup(struct nvmet_ctrl *ctrl, struct nvmet_cq *cq, u16 qid,
u16 size);
void nvmet_sq_setup(struct nvmet_ctrl *ctrl, struct nvmet_sq *sq, u16 qid,
u16 size);
void nvmet_sq_destroy(struct nvmet_sq *sq);
int nvmet_sq_init(struct nvmet_sq *sq);
void nvmet_ctrl_fatal_error(struct nvmet_ctrl *ctrl);
void nvmet_update_cc(struct nvmet_ctrl *ctrl, u32 new);
u16 nvmet_alloc_ctrl(const char *subsysnqn, const char *hostnqn,
struct nvmet_req *req, u32 kato, struct nvmet_ctrl **ctrlp);
u16 nvmet_ctrl_find_get(const char *subsysnqn, const char *hostnqn, u16 cntlid,
struct nvmet_req *req, struct nvmet_ctrl **ret);
void nvmet_ctrl_put(struct nvmet_ctrl *ctrl);
u16 nvmet_check_ctrl_status(struct nvmet_req *req, struct nvme_command *cmd);
struct nvmet_subsys *nvmet_subsys_alloc(const char *subsysnqn,
enum nvme_subsys_type type);
void nvmet_subsys_put(struct nvmet_subsys *subsys);
void nvmet_subsys_del_ctrls(struct nvmet_subsys *subsys);
struct nvmet_ns *nvmet_find_namespace(struct nvmet_ctrl *ctrl, __le32 nsid);
void nvmet_put_namespace(struct nvmet_ns *ns);
int nvmet_ns_enable(struct nvmet_ns *ns);
void nvmet_ns_disable(struct nvmet_ns *ns);
struct nvmet_ns *nvmet_ns_alloc(struct nvmet_subsys *subsys, u32 nsid);
void nvmet_ns_free(struct nvmet_ns *ns);
void nvmet_send_ana_event(struct nvmet_subsys *subsys,
struct nvmet_port *port);
void nvmet_port_send_ana_event(struct nvmet_port *port);
int nvmet_register_transport(const struct nvmet_fabrics_ops *ops);
void nvmet_unregister_transport(const struct nvmet_fabrics_ops *ops);
void nvmet_port_del_ctrls(struct nvmet_port *port,
struct nvmet_subsys *subsys);
int nvmet_enable_port(struct nvmet_port *port);
void nvmet_disable_port(struct nvmet_port *port);
void nvmet_referral_enable(struct nvmet_port *parent, struct nvmet_port *port);
void nvmet_referral_disable(struct nvmet_port *parent, struct nvmet_port *port);
u16 nvmet_copy_to_sgl(struct nvmet_req *req, off_t off, const void *buf,
size_t len);
u16 nvmet_copy_from_sgl(struct nvmet_req *req, off_t off, void *buf,
size_t len);
u16 nvmet_zero_sgl(struct nvmet_req *req, off_t off, size_t len);
u32 nvmet_get_log_page_len(struct nvme_command *cmd);
u64 nvmet_get_log_page_offset(struct nvme_command *cmd);
extern struct list_head *nvmet_ports;
void nvmet_port_disc_changed(struct nvmet_port *port,
struct nvmet_subsys *subsys);
void nvmet_subsys_disc_changed(struct nvmet_subsys *subsys,
struct nvmet_host *host);
void nvmet_add_async_event(struct nvmet_ctrl *ctrl, u8 event_type,
u8 event_info, u8 log_page);
#define NVMET_QUEUE_SIZE 1024
#define NVMET_NR_QUEUES 128
* Nice round number that makes a list of nsids fit into a page.
* Should become tunable at some point in the future.
* 0 is not a valid ANA group ID, so we start numbering at 1.
* ANA Group 1 exists without manual intervention, has namespaces assigned to it
* by default, and is available in an optimized state through all ports.
#define NVMET_KAS 10
#define NVMET_DISC_KATO_MS 120000
int __init nvmet_init_configfs(void);
void __exit nvmet_exit_configfs(void);
int __init nvmet_init_discovery(void);
void nvmet_exit_discovery(void);
extern struct nvmet_subsys *nvmet_disc_subsys;
extern struct rw_semaphore nvmet_config_sem;
extern u32 nvmet_ana_group_enabled[NVMET_MAX_ANAGRPS + 1];
extern u64 nvmet_ana_chgcnt;
extern struct rw_semaphore nvmet_ana_sem;
bool nvmet_host_allowed(struct nvmet_subsys *subsys, const char *hostnqn);
int nvmet_bdev_ns_enable(struct nvmet_ns *ns);
int nvmet_file_ns_enable(struct nvmet_ns *ns);
void nvmet_bdev_ns_disable(struct nvmet_ns *ns);
void nvmet_file_ns_disable(struct nvmet_ns *ns);
u16 nvmet_bdev_flush(struct nvmet_req *req);
u16 nvmet_file_flush(struct nvmet_req *req);
void nvmet_ns_changed(struct nvmet_subsys *subsys, u32 nsid);
static inline u32 nvmet_rw_len(struct nvmet_req *req)
return ((u32)le16_to_cpu(req->cmd->rw.length) + 1) <<
static inline u32 nvmet_dsm_len(struct nvmet_req *req)
return (le32_to_cpu(req->cmd-> + 1) *
sizeof(struct nvme_dsm_range);
u16 errno_to_nvme_status(struct nvmet_req *req, int errno);
/* Convert a 32-bit number to a 16-bit 0's based number */
static inline __le16 to0based(u32 a)
return cpu_to_le16(max(1U, min(1U << 16, a)) - 1);
#endif /* _NVMET_H */