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
;
76 struct completion confirm_done
;
80 * struct nvmet_port - Common structure to keep port
81 * information for the target.
82 * @entry: List head for holding a list of these elements.
83 * @disc_addr: Address information is stored in a format defined
84 * for a discovery log page entry.
85 * @group: ConfigFS group for this element's folder.
86 * @priv: Private data for the transport.
89 struct list_head entry
;
90 struct nvmf_disc_rsp_page_entry disc_addr
;
91 struct config_group group
;
92 struct config_group subsys_group
;
93 struct list_head subsystems
;
94 struct config_group referrals_group
;
95 struct list_head referrals
;
100 static inline struct nvmet_port
*to_nvmet_port(struct config_item
*item
)
102 return container_of(to_config_group(item
), struct nvmet_port
,
107 struct nvmet_subsys
*subsys
;
108 struct nvmet_cq
**cqs
;
109 struct nvmet_sq
**sqs
;
120 struct nvmet_req
*async_event_cmds
[NVMET_ASYNC_EVENTS
];
121 unsigned int nr_async_event_cmds
;
122 struct list_head async_events
;
123 struct work_struct async_event_work
;
125 struct list_head subsys_entry
;
127 struct delayed_work ka_work
;
128 struct work_struct fatal_err_work
;
130 struct nvmet_fabrics_ops
*ops
;
132 char subsysnqn
[NVMF_NQN_FIELD_LEN
];
133 char hostnqn
[NVMF_NQN_FIELD_LEN
];
136 struct nvmet_subsys
{
137 enum nvme_subsys_type type
;
142 struct list_head namespaces
;
143 unsigned int max_nsid
;
145 struct list_head ctrls
;
147 struct list_head hosts
;
155 struct config_group group
;
157 struct config_group namespaces_group
;
158 struct config_group allowed_hosts_group
;
161 static inline struct nvmet_subsys
*to_subsys(struct config_item
*item
)
163 return container_of(to_config_group(item
), struct nvmet_subsys
, group
);
166 static inline struct nvmet_subsys
*namespaces_to_subsys(
167 struct config_item
*item
)
169 return container_of(to_config_group(item
), struct nvmet_subsys
,
174 struct config_group group
;
177 static inline struct nvmet_host
*to_host(struct config_item
*item
)
179 return container_of(to_config_group(item
), struct nvmet_host
, group
);
182 static inline char *nvmet_host_name(struct nvmet_host
*host
)
184 return config_item_name(&host
->group
.cg_item
);
187 struct nvmet_host_link
{
188 struct list_head entry
;
189 struct nvmet_host
*host
;
192 struct nvmet_subsys_link
{
193 struct list_head entry
;
194 struct nvmet_subsys
*subsys
;
198 struct nvmet_fabrics_ops
{
199 struct module
*owner
;
201 unsigned int sqe_inline_size
;
203 bool has_keyed_sgls
: 1;
204 void (*queue_response
)(struct nvmet_req
*req
);
205 int (*add_port
)(struct nvmet_port
*port
);
206 void (*remove_port
)(struct nvmet_port
*port
);
207 void (*delete_ctrl
)(struct nvmet_ctrl
*ctrl
);
210 #define NVMET_MAX_INLINE_BIOVEC 8
213 struct nvme_command
*cmd
;
214 struct nvme_completion
*rsp
;
218 struct scatterlist
*sg
;
219 struct bio inline_bio
;
220 struct bio_vec inline_bvec
[NVMET_MAX_INLINE_BIOVEC
];
224 struct nvmet_port
*port
;
226 void (*execute
)(struct nvmet_req
*req
);
227 struct nvmet_fabrics_ops
*ops
;
230 static inline void nvmet_set_status(struct nvmet_req
*req
, u16 status
)
232 req
->rsp
->status
= cpu_to_le16(status
<< 1);
235 static inline void nvmet_set_result(struct nvmet_req
*req
, u32 result
)
237 req
->rsp
->result
.u32
= cpu_to_le32(result
);
241 * NVMe command writes actually are DMA reads for us on the target side.
243 static inline enum dma_data_direction
244 nvmet_data_dir(struct nvmet_req
*req
)
246 return nvme_is_write(req
->cmd
) ? DMA_FROM_DEVICE
: DMA_TO_DEVICE
;
249 struct nvmet_async_event
{
250 struct list_head entry
;
256 u16
nvmet_parse_connect_cmd(struct nvmet_req
*req
);
257 u16
nvmet_parse_io_cmd(struct nvmet_req
*req
);
258 u16
nvmet_parse_admin_cmd(struct nvmet_req
*req
);
259 u16
nvmet_parse_discovery_cmd(struct nvmet_req
*req
);
260 u16
nvmet_parse_fabrics_cmd(struct nvmet_req
*req
);
262 bool nvmet_req_init(struct nvmet_req
*req
, struct nvmet_cq
*cq
,
263 struct nvmet_sq
*sq
, struct nvmet_fabrics_ops
*ops
);
264 void nvmet_req_complete(struct nvmet_req
*req
, u16 status
);
266 void nvmet_cq_setup(struct nvmet_ctrl
*ctrl
, struct nvmet_cq
*cq
, u16 qid
,
268 void nvmet_sq_setup(struct nvmet_ctrl
*ctrl
, struct nvmet_sq
*sq
, u16 qid
,
270 void nvmet_sq_destroy(struct nvmet_sq
*sq
);
271 int nvmet_sq_init(struct nvmet_sq
*sq
);
273 void nvmet_ctrl_fatal_error(struct nvmet_ctrl
*ctrl
);
275 void nvmet_update_cc(struct nvmet_ctrl
*ctrl
, u32
new);
276 u16
nvmet_alloc_ctrl(const char *subsysnqn
, const char *hostnqn
,
277 struct nvmet_req
*req
, u32 kato
, struct nvmet_ctrl
**ctrlp
);
278 u16
nvmet_ctrl_find_get(const char *subsysnqn
, const char *hostnqn
, u16 cntlid
,
279 struct nvmet_req
*req
, struct nvmet_ctrl
**ret
);
280 void nvmet_ctrl_put(struct nvmet_ctrl
*ctrl
);
281 u16
nvmet_check_ctrl_status(struct nvmet_req
*req
, struct nvme_command
*cmd
);
283 struct nvmet_subsys
*nvmet_subsys_alloc(const char *subsysnqn
,
284 enum nvme_subsys_type type
);
285 void nvmet_subsys_put(struct nvmet_subsys
*subsys
);
286 void nvmet_subsys_del_ctrls(struct nvmet_subsys
*subsys
);
288 struct nvmet_ns
*nvmet_find_namespace(struct nvmet_ctrl
*ctrl
, __le32 nsid
);
289 void nvmet_put_namespace(struct nvmet_ns
*ns
);
290 int nvmet_ns_enable(struct nvmet_ns
*ns
);
291 void nvmet_ns_disable(struct nvmet_ns
*ns
);
292 struct nvmet_ns
*nvmet_ns_alloc(struct nvmet_subsys
*subsys
, u32 nsid
);
293 void nvmet_ns_free(struct nvmet_ns
*ns
);
295 int nvmet_register_transport(struct nvmet_fabrics_ops
*ops
);
296 void nvmet_unregister_transport(struct nvmet_fabrics_ops
*ops
);
298 int nvmet_enable_port(struct nvmet_port
*port
);
299 void nvmet_disable_port(struct nvmet_port
*port
);
301 void nvmet_referral_enable(struct nvmet_port
*parent
, struct nvmet_port
*port
);
302 void nvmet_referral_disable(struct nvmet_port
*port
);
304 u16
nvmet_copy_to_sgl(struct nvmet_req
*req
, off_t off
, const void *buf
,
306 u16
nvmet_copy_from_sgl(struct nvmet_req
*req
, off_t off
, void *buf
,
309 u32
nvmet_get_log_page_len(struct nvme_command
*cmd
);
311 #define NVMET_QUEUE_SIZE 1024
312 #define NVMET_NR_QUEUES 64
313 #define NVMET_MAX_CMD NVMET_QUEUE_SIZE
315 #define NVMET_DISC_KATO 120
317 int __init
nvmet_init_configfs(void);
318 void __exit
nvmet_exit_configfs(void);
320 int __init
nvmet_init_discovery(void);
321 void nvmet_exit_discovery(void);
323 extern struct nvmet_subsys
*nvmet_disc_subsys
;
324 extern u64 nvmet_genctr
;
325 extern struct rw_semaphore nvmet_config_sem
;
327 bool nvmet_host_allowed(struct nvmet_req
*req
, struct nvmet_subsys
*subsys
,
328 const char *hostnqn
);
330 #endif /* _NVMET_H */