Release 4.14 drivers/nvme/target/nvmet.h
/*
* Copyright (c) 2015-2016 HGST, a Western Digital Company.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*/
#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>
#define NVMET_ASYNC_EVENTS 4
#define NVMET_ERROR_LOG_SLOTS 128
/* 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()
*/
#define IPO_IATTR_CONNECT_DATA(x) \
(cpu_to_le32((1 << 16) | (offsetof(struct nvmf_connect_data, x))))
#define IPO_IATTR_CONNECT_SQE(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;
u32 nsid;
u32 blksize_shift;
loff_t size;
u8 nguid[16];
uuid_t uuid;
bool enabled;
struct nvmet_subsys *subsys;
const char *device_path;
struct config_group device_group;
struct config_group group;
struct completion disable_done;
};
static inline struct nvmet_ns *to_nvmet_ns(struct config_item *item)
{
return container_of(to_config_group(item), struct nvmet_ns, group);
}
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struct nvmet_cq {
u16 qid;
u16 size;
};
struct nvmet_sq {
struct nvmet_ctrl *ctrl;
struct percpu_ref ref;
u16 qid;
u16 size;
u32 sqhd;
struct completion free_done;
struct completion confirm_done;
};
/**
* struct nvmet_port - Common structure to keep port
* information for the target.
* @entry: List head for holding a list of these elements.
* @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;
void *priv;
bool enabled;
};
static inline struct nvmet_port *to_nvmet_port(struct config_item *item)
{
return container_of(to_config_group(item), struct nvmet_port,
group);
}
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struct nvmet_ctrl {
struct nvmet_subsys *subsys;
struct nvmet_cq **cqs;
struct nvmet_sq **sqs;
struct mutex lock;
u64 cap;
u32 cc;
u32 csts;
uuid_t hostid;
u16 cntlid;
u32 kato;
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;
struct nvmet_fabrics_ops *ops;
char subsysnqn[NVMF_NQN_FIELD_LEN];
char hostnqn[NVMF_NQN_FIELD_LEN];
};
struct nvmet_subsys {
enum nvme_subsys_type type;
struct mutex lock;
struct kref ref;
struct list_head 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);
}
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static inline struct nvmet_subsys *namespaces_to_subsys(
struct config_item *item)
{
return container_of(to_config_group(item), struct nvmet_subsys,
namespaces_group);
}
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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);
}
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static inline char *nvmet_host_name(struct nvmet_host *host)
{
return config_item_name(&host->group.cg_item);
}
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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 sqe_inline_size;
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);
};
#define NVMET_MAX_INLINE_BIOVEC 8
struct nvmet_req {
struct nvme_command *cmd;
struct nvme_completion *rsp;
struct nvmet_sq *sq;
struct nvmet_cq *cq;
struct nvmet_ns *ns;
struct scatterlist *sg;
struct bio inline_bio;
struct bio_vec inline_bvec[NVMET_MAX_INLINE_BIOVEC];
int sg_cnt;
size_t data_len;
struct nvmet_port *port;
void (*execute)(struct nvmet_req *req);
struct nvmet_fabrics_ops *ops;
};
static inline void nvmet_set_status(struct nvmet_req *req, u16 status)
{
req->rsp->status = cpu_to_le16(status << 1);
}
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static inline void nvmet_set_result(struct nvmet_req *req, u32 result)
{
req->rsp->result.u32 = cpu_to_le32(result);
}
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/*
* 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;
}
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struct nvmet_async_event {
struct list_head entry;
u8 event_type;
u8 event_info;
u8 log_page;
};
u16 nvmet_parse_connect_cmd(struct nvmet_req *req);
u16 nvmet_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, struct nvmet_fabrics_ops *ops);
void nvmet_req_uninit(struct nvmet_req *req);
void nvmet_req_complete(struct nvmet_req *req, u16 status);
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);
int nvmet_register_transport(struct nvmet_fabrics_ops *ops);
void nvmet_unregister_transport(struct nvmet_fabrics_ops *ops);
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 *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);
u32 nvmet_get_log_page_len(struct nvme_command *cmd);
#define NVMET_QUEUE_SIZE 1024
#define NVMET_NR_QUEUES 64
#define NVMET_MAX_CMD NVMET_QUEUE_SIZE
#define NVMET_KAS 10
#define NVMET_DISC_KATO 120
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 u64 nvmet_genctr;
extern struct rw_semaphore nvmet_config_sem;
bool nvmet_host_allowed(struct nvmet_req *req, struct nvmet_subsys *subsys,
const char *hostnqn);
#endif /* _NVMET_H */
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