2 * Copyright (c) 2015-2016 HGST, a Western Digital Company.
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
17 #include <linux/dma-mapping.h>
18 #include <linux/types.h>
19 #include <linux/device.h>
20 #include <linux/kref.h>
21 #include <linux/percpu-refcount.h>
22 #include <linux/list.h>
23 #include <linux/mutex.h>
24 #include <linux/nvme.h>
25 #include <linux/configfs.h>
26 #include <linux/rcupdate.h>
27 #include <linux/blkdev.h>
29 #define NVMET_ASYNC_EVENTS 4
30 #define NVMET_ERROR_LOG_SLOTS 128
32 /* Helper Macros when NVMe error is NVME_SC_CONNECT_INVALID_PARAM
33 * The 16 bit shift is to set IATTR bit to 1, which means offending
34 * offset starts in the data section of connect()
36 #define IPO_IATTR_CONNECT_DATA(x) \
37 (cpu_to_le32((1 << 16) | (offsetof(struct nvmf_connect_data, x))))
38 #define IPO_IATTR_CONNECT_SQE(x) \
39 (cpu_to_le32(offsetof(struct nvmf_connect_command, x)))
42 struct list_head dev_link
;
43 struct percpu_ref ref
;
44 struct block_device
*bdev
;
51 struct nvmet_subsys
*subsys
;
52 const char *device_path
;
54 struct config_group device_group
;
55 struct config_group group
;
57 struct completion disable_done
;
60 static inline struct nvmet_ns
*to_nvmet_ns(struct config_item
*item
)
62 return container_of(to_config_group(item
), struct nvmet_ns
, group
);
71 struct nvmet_ctrl
*ctrl
;
72 struct percpu_ref ref
;
75 struct completion free_done
;
79 * struct nvmet_port - Common structure to keep port
80 * information for the target.
81 * @entry: List head for holding a list of these elements.
82 * @disc_addr: Address information is stored in a format defined
83 * for a discovery log page entry.
84 * @group: ConfigFS group for this element's folder.
85 * @priv: Private data for the transport.
88 struct list_head entry
;
89 struct nvmf_disc_rsp_page_entry disc_addr
;
90 struct config_group group
;
91 struct config_group subsys_group
;
92 struct list_head subsystems
;
93 struct config_group referrals_group
;
94 struct list_head referrals
;
99 static inline struct nvmet_port
*to_nvmet_port(struct config_item
*item
)
101 return container_of(to_config_group(item
), struct nvmet_port
,
106 struct nvmet_subsys
*subsys
;
107 struct nvmet_cq
**cqs
;
108 struct nvmet_sq
**sqs
;
119 struct nvmet_req
*async_event_cmds
[NVMET_ASYNC_EVENTS
];
120 unsigned int nr_async_event_cmds
;
121 struct list_head async_events
;
122 struct work_struct async_event_work
;
124 struct list_head subsys_entry
;
126 struct delayed_work ka_work
;
127 struct work_struct fatal_err_work
;
129 struct nvmet_fabrics_ops
*ops
;
131 char subsysnqn
[NVMF_NQN_FIELD_LEN
];
132 char hostnqn
[NVMF_NQN_FIELD_LEN
];
135 struct nvmet_subsys
{
136 enum nvme_subsys_type type
;
141 struct list_head namespaces
;
142 unsigned int max_nsid
;
144 struct list_head ctrls
;
146 struct list_head hosts
;
154 struct config_group group
;
156 struct config_group namespaces_group
;
157 struct config_group allowed_hosts_group
;
160 static inline struct nvmet_subsys
*to_subsys(struct config_item
*item
)
162 return container_of(to_config_group(item
), struct nvmet_subsys
, group
);
165 static inline struct nvmet_subsys
*namespaces_to_subsys(
166 struct config_item
*item
)
168 return container_of(to_config_group(item
), struct nvmet_subsys
,
173 struct config_group group
;
176 static inline struct nvmet_host
*to_host(struct config_item
*item
)
178 return container_of(to_config_group(item
), struct nvmet_host
, group
);
181 static inline char *nvmet_host_name(struct nvmet_host
*host
)
183 return config_item_name(&host
->group
.cg_item
);
186 struct nvmet_host_link
{
187 struct list_head entry
;
188 struct nvmet_host
*host
;
191 struct nvmet_subsys_link
{
192 struct list_head entry
;
193 struct nvmet_subsys
*subsys
;
197 struct nvmet_fabrics_ops
{
198 struct module
*owner
;
200 unsigned int sqe_inline_size
;
202 bool has_keyed_sgls
: 1;
203 void (*queue_response
)(struct nvmet_req
*req
);
204 int (*add_port
)(struct nvmet_port
*port
);
205 void (*remove_port
)(struct nvmet_port
*port
);
206 void (*delete_ctrl
)(struct nvmet_ctrl
*ctrl
);
209 #define NVMET_MAX_INLINE_BIOVEC 8
212 struct nvme_command
*cmd
;
213 struct nvme_completion
*rsp
;
217 struct scatterlist
*sg
;
218 struct bio inline_bio
;
219 struct bio_vec inline_bvec
[NVMET_MAX_INLINE_BIOVEC
];
223 struct nvmet_port
*port
;
225 void (*execute
)(struct nvmet_req
*req
);
226 struct nvmet_fabrics_ops
*ops
;
229 static inline void nvmet_set_status(struct nvmet_req
*req
, u16 status
)
231 req
->rsp
->status
= cpu_to_le16(status
<< 1);
234 static inline void nvmet_set_result(struct nvmet_req
*req
, u32 result
)
236 req
->rsp
->result
.u32
= cpu_to_le32(result
);
240 * NVMe command writes actually are DMA reads for us on the target side.
242 static inline enum dma_data_direction
243 nvmet_data_dir(struct nvmet_req
*req
)
245 return nvme_is_write(req
->cmd
) ? DMA_FROM_DEVICE
: DMA_TO_DEVICE
;
248 struct nvmet_async_event
{
249 struct list_head entry
;
255 int nvmet_parse_connect_cmd(struct nvmet_req
*req
);
256 int nvmet_parse_io_cmd(struct nvmet_req
*req
);
257 int nvmet_parse_admin_cmd(struct nvmet_req
*req
);
258 int nvmet_parse_discovery_cmd(struct nvmet_req
*req
);
259 int nvmet_parse_fabrics_cmd(struct nvmet_req
*req
);
261 bool nvmet_req_init(struct nvmet_req
*req
, struct nvmet_cq
*cq
,
262 struct nvmet_sq
*sq
, struct nvmet_fabrics_ops
*ops
);
263 void nvmet_req_complete(struct nvmet_req
*req
, u16 status
);
265 void nvmet_cq_setup(struct nvmet_ctrl
*ctrl
, struct nvmet_cq
*cq
, u16 qid
,
267 void nvmet_sq_setup(struct nvmet_ctrl
*ctrl
, struct nvmet_sq
*sq
, u16 qid
,
269 void nvmet_sq_destroy(struct nvmet_sq
*sq
);
270 int nvmet_sq_init(struct nvmet_sq
*sq
);
272 void nvmet_ctrl_fatal_error(struct nvmet_ctrl
*ctrl
);
274 void nvmet_update_cc(struct nvmet_ctrl
*ctrl
, u32
new);
275 u16
nvmet_alloc_ctrl(const char *subsysnqn
, const char *hostnqn
,
276 struct nvmet_req
*req
, u32 kato
, struct nvmet_ctrl
**ctrlp
);
277 u16
nvmet_ctrl_find_get(const char *subsysnqn
, const char *hostnqn
, u16 cntlid
,
278 struct nvmet_req
*req
, struct nvmet_ctrl
**ret
);
279 void nvmet_ctrl_put(struct nvmet_ctrl
*ctrl
);
281 struct nvmet_subsys
*nvmet_subsys_alloc(const char *subsysnqn
,
282 enum nvme_subsys_type type
);
283 void nvmet_subsys_put(struct nvmet_subsys
*subsys
);
284 void nvmet_subsys_del_ctrls(struct nvmet_subsys
*subsys
);
286 struct nvmet_ns
*nvmet_find_namespace(struct nvmet_ctrl
*ctrl
, __le32 nsid
);
287 void nvmet_put_namespace(struct nvmet_ns
*ns
);
288 int nvmet_ns_enable(struct nvmet_ns
*ns
);
289 void nvmet_ns_disable(struct nvmet_ns
*ns
);
290 struct nvmet_ns
*nvmet_ns_alloc(struct nvmet_subsys
*subsys
, u32 nsid
);
291 void nvmet_ns_free(struct nvmet_ns
*ns
);
293 int nvmet_register_transport(struct nvmet_fabrics_ops
*ops
);
294 void nvmet_unregister_transport(struct nvmet_fabrics_ops
*ops
);
296 int nvmet_enable_port(struct nvmet_port
*port
);
297 void nvmet_disable_port(struct nvmet_port
*port
);
299 void nvmet_referral_enable(struct nvmet_port
*parent
, struct nvmet_port
*port
);
300 void nvmet_referral_disable(struct nvmet_port
*port
);
302 u16
nvmet_copy_to_sgl(struct nvmet_req
*req
, off_t off
, const void *buf
,
304 u16
nvmet_copy_from_sgl(struct nvmet_req
*req
, off_t off
, void *buf
,
307 u32
nvmet_get_log_page_len(struct nvme_command
*cmd
);
309 #define NVMET_QUEUE_SIZE 1024
310 #define NVMET_NR_QUEUES 64
311 #define NVMET_MAX_CMD NVMET_QUEUE_SIZE
313 #define NVMET_DISC_KATO 120
315 int __init
nvmet_init_configfs(void);
316 void __exit
nvmet_exit_configfs(void);
318 int __init
nvmet_init_discovery(void);
319 void nvmet_exit_discovery(void);
321 extern struct nvmet_subsys
*nvmet_disc_subsys
;
322 extern u64 nvmet_genctr
;
323 extern struct rw_semaphore nvmet_config_sem
;
325 bool nvmet_host_allowed(struct nvmet_req
*req
, struct nvmet_subsys
*subsys
,
326 const char *hostnqn
);
328 #endif /* _NVMET_H */