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a07b4970 CH |
1 | /* |
2 | * Copyright (c) 2015-2016 HGST, a Western Digital Company. | |
3 | * | |
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. | |
7 | * | |
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 | |
11 | * more details. | |
12 | */ | |
13 | ||
14 | #ifndef _NVMET_H | |
15 | #define _NVMET_H | |
16 | ||
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> | |
8e412263 | 24 | #include <linux/uuid.h> |
a07b4970 CH |
25 | #include <linux/nvme.h> |
26 | #include <linux/configfs.h> | |
27 | #include <linux/rcupdate.h> | |
28 | #include <linux/blkdev.h> | |
29 | ||
30 | #define NVMET_ASYNC_EVENTS 4 | |
31 | #define NVMET_ERROR_LOG_SLOTS 128 | |
32 | ||
33 | /* Helper Macros when NVMe error is NVME_SC_CONNECT_INVALID_PARAM | |
34 | * The 16 bit shift is to set IATTR bit to 1, which means offending | |
35 | * offset starts in the data section of connect() | |
36 | */ | |
37 | #define IPO_IATTR_CONNECT_DATA(x) \ | |
38 | (cpu_to_le32((1 << 16) | (offsetof(struct nvmf_connect_data, x)))) | |
39 | #define IPO_IATTR_CONNECT_SQE(x) \ | |
40 | (cpu_to_le32(offsetof(struct nvmf_connect_command, x))) | |
41 | ||
42 | struct nvmet_ns { | |
43 | struct list_head dev_link; | |
44 | struct percpu_ref ref; | |
45 | struct block_device *bdev; | |
46 | u32 nsid; | |
47 | u32 blksize_shift; | |
48 | loff_t size; | |
49 | u8 nguid[16]; | |
637dc0f3 | 50 | uuid_t uuid; |
a07b4970 | 51 | |
e4fcf07c | 52 | bool enabled; |
a07b4970 CH |
53 | struct nvmet_subsys *subsys; |
54 | const char *device_path; | |
55 | ||
56 | struct config_group device_group; | |
57 | struct config_group group; | |
58 | ||
59 | struct completion disable_done; | |
60 | }; | |
61 | ||
62 | static inline struct nvmet_ns *to_nvmet_ns(struct config_item *item) | |
63 | { | |
64 | return container_of(to_config_group(item), struct nvmet_ns, group); | |
65 | } | |
66 | ||
a07b4970 CH |
67 | struct nvmet_cq { |
68 | u16 qid; | |
69 | u16 size; | |
70 | }; | |
71 | ||
72 | struct nvmet_sq { | |
73 | struct nvmet_ctrl *ctrl; | |
74 | struct percpu_ref ref; | |
75 | u16 qid; | |
76 | u16 size; | |
77 | struct completion free_done; | |
427242ce | 78 | struct completion confirm_done; |
a07b4970 CH |
79 | }; |
80 | ||
81 | /** | |
82 | * struct nvmet_port - Common structure to keep port | |
83 | * information for the target. | |
84 | * @entry: List head for holding a list of these elements. | |
85 | * @disc_addr: Address information is stored in a format defined | |
86 | * for a discovery log page entry. | |
87 | * @group: ConfigFS group for this element's folder. | |
88 | * @priv: Private data for the transport. | |
89 | */ | |
90 | struct nvmet_port { | |
91 | struct list_head entry; | |
92 | struct nvmf_disc_rsp_page_entry disc_addr; | |
93 | struct config_group group; | |
94 | struct config_group subsys_group; | |
95 | struct list_head subsystems; | |
96 | struct config_group referrals_group; | |
97 | struct list_head referrals; | |
98 | void *priv; | |
99 | bool enabled; | |
100 | }; | |
101 | ||
102 | static inline struct nvmet_port *to_nvmet_port(struct config_item *item) | |
103 | { | |
104 | return container_of(to_config_group(item), struct nvmet_port, | |
105 | group); | |
106 | } | |
107 | ||
108 | struct nvmet_ctrl { | |
109 | struct nvmet_subsys *subsys; | |
110 | struct nvmet_cq **cqs; | |
111 | struct nvmet_sq **sqs; | |
112 | ||
113 | struct mutex lock; | |
114 | u64 cap; | |
115 | u32 cc; | |
116 | u32 csts; | |
117 | ||
28dd5cf7 | 118 | uuid_t hostid; |
a07b4970 CH |
119 | u16 cntlid; |
120 | u32 kato; | |
121 | ||
122 | struct nvmet_req *async_event_cmds[NVMET_ASYNC_EVENTS]; | |
123 | unsigned int nr_async_event_cmds; | |
124 | struct list_head async_events; | |
125 | struct work_struct async_event_work; | |
126 | ||
127 | struct list_head subsys_entry; | |
128 | struct kref ref; | |
129 | struct delayed_work ka_work; | |
130 | struct work_struct fatal_err_work; | |
131 | ||
132 | struct nvmet_fabrics_ops *ops; | |
133 | ||
134 | char subsysnqn[NVMF_NQN_FIELD_LEN]; | |
135 | char hostnqn[NVMF_NQN_FIELD_LEN]; | |
136 | }; | |
137 | ||
138 | struct nvmet_subsys { | |
139 | enum nvme_subsys_type type; | |
140 | ||
141 | struct mutex lock; | |
142 | struct kref ref; | |
143 | ||
144 | struct list_head namespaces; | |
145 | unsigned int max_nsid; | |
146 | ||
147 | struct list_head ctrls; | |
a07b4970 CH |
148 | |
149 | struct list_head hosts; | |
150 | bool allow_any_host; | |
151 | ||
152 | u16 max_qid; | |
153 | ||
154 | u64 ver; | |
2e7f5d2a | 155 | u64 serial; |
a07b4970 CH |
156 | char *subsysnqn; |
157 | ||
158 | struct config_group group; | |
159 | ||
160 | struct config_group namespaces_group; | |
161 | struct config_group allowed_hosts_group; | |
162 | }; | |
163 | ||
164 | static inline struct nvmet_subsys *to_subsys(struct config_item *item) | |
165 | { | |
166 | return container_of(to_config_group(item), struct nvmet_subsys, group); | |
167 | } | |
168 | ||
169 | static inline struct nvmet_subsys *namespaces_to_subsys( | |
170 | struct config_item *item) | |
171 | { | |
172 | return container_of(to_config_group(item), struct nvmet_subsys, | |
173 | namespaces_group); | |
174 | } | |
175 | ||
176 | struct nvmet_host { | |
177 | struct config_group group; | |
178 | }; | |
179 | ||
180 | static inline struct nvmet_host *to_host(struct config_item *item) | |
181 | { | |
182 | return container_of(to_config_group(item), struct nvmet_host, group); | |
183 | } | |
184 | ||
185 | static inline char *nvmet_host_name(struct nvmet_host *host) | |
186 | { | |
187 | return config_item_name(&host->group.cg_item); | |
188 | } | |
189 | ||
190 | struct nvmet_host_link { | |
191 | struct list_head entry; | |
192 | struct nvmet_host *host; | |
193 | }; | |
194 | ||
195 | struct nvmet_subsys_link { | |
196 | struct list_head entry; | |
197 | struct nvmet_subsys *subsys; | |
198 | }; | |
199 | ||
200 | struct nvmet_req; | |
201 | struct nvmet_fabrics_ops { | |
202 | struct module *owner; | |
203 | unsigned int type; | |
204 | unsigned int sqe_inline_size; | |
205 | unsigned int msdbd; | |
206 | bool has_keyed_sgls : 1; | |
207 | void (*queue_response)(struct nvmet_req *req); | |
208 | int (*add_port)(struct nvmet_port *port); | |
209 | void (*remove_port)(struct nvmet_port *port); | |
210 | void (*delete_ctrl)(struct nvmet_ctrl *ctrl); | |
211 | }; | |
212 | ||
213 | #define NVMET_MAX_INLINE_BIOVEC 8 | |
214 | ||
215 | struct nvmet_req { | |
216 | struct nvme_command *cmd; | |
217 | struct nvme_completion *rsp; | |
218 | struct nvmet_sq *sq; | |
219 | struct nvmet_cq *cq; | |
220 | struct nvmet_ns *ns; | |
221 | struct scatterlist *sg; | |
222 | struct bio inline_bio; | |
223 | struct bio_vec inline_bvec[NVMET_MAX_INLINE_BIOVEC]; | |
224 | int sg_cnt; | |
225 | size_t data_len; | |
226 | ||
227 | struct nvmet_port *port; | |
228 | ||
229 | void (*execute)(struct nvmet_req *req); | |
230 | struct nvmet_fabrics_ops *ops; | |
231 | }; | |
232 | ||
233 | static inline void nvmet_set_status(struct nvmet_req *req, u16 status) | |
234 | { | |
235 | req->rsp->status = cpu_to_le16(status << 1); | |
236 | } | |
237 | ||
238 | static inline void nvmet_set_result(struct nvmet_req *req, u32 result) | |
239 | { | |
d49187e9 | 240 | req->rsp->result.u32 = cpu_to_le32(result); |
a07b4970 CH |
241 | } |
242 | ||
243 | /* | |
244 | * NVMe command writes actually are DMA reads for us on the target side. | |
245 | */ | |
246 | static inline enum dma_data_direction | |
247 | nvmet_data_dir(struct nvmet_req *req) | |
248 | { | |
249 | return nvme_is_write(req->cmd) ? DMA_FROM_DEVICE : DMA_TO_DEVICE; | |
250 | } | |
251 | ||
252 | struct nvmet_async_event { | |
253 | struct list_head entry; | |
254 | u8 event_type; | |
255 | u8 event_info; | |
256 | u8 log_page; | |
257 | }; | |
258 | ||
64a0ca88 PP |
259 | u16 nvmet_parse_connect_cmd(struct nvmet_req *req); |
260 | u16 nvmet_parse_io_cmd(struct nvmet_req *req); | |
261 | u16 nvmet_parse_admin_cmd(struct nvmet_req *req); | |
262 | u16 nvmet_parse_discovery_cmd(struct nvmet_req *req); | |
263 | u16 nvmet_parse_fabrics_cmd(struct nvmet_req *req); | |
a07b4970 CH |
264 | |
265 | bool nvmet_req_init(struct nvmet_req *req, struct nvmet_cq *cq, | |
266 | struct nvmet_sq *sq, struct nvmet_fabrics_ops *ops); | |
549f01ae | 267 | void nvmet_req_uninit(struct nvmet_req *req); |
a07b4970 CH |
268 | void nvmet_req_complete(struct nvmet_req *req, u16 status); |
269 | ||
270 | void nvmet_cq_setup(struct nvmet_ctrl *ctrl, struct nvmet_cq *cq, u16 qid, | |
271 | u16 size); | |
272 | void nvmet_sq_setup(struct nvmet_ctrl *ctrl, struct nvmet_sq *sq, u16 qid, | |
273 | u16 size); | |
274 | void nvmet_sq_destroy(struct nvmet_sq *sq); | |
275 | int nvmet_sq_init(struct nvmet_sq *sq); | |
276 | ||
277 | void nvmet_ctrl_fatal_error(struct nvmet_ctrl *ctrl); | |
278 | ||
279 | void nvmet_update_cc(struct nvmet_ctrl *ctrl, u32 new); | |
280 | u16 nvmet_alloc_ctrl(const char *subsysnqn, const char *hostnqn, | |
281 | struct nvmet_req *req, u32 kato, struct nvmet_ctrl **ctrlp); | |
282 | u16 nvmet_ctrl_find_get(const char *subsysnqn, const char *hostnqn, u16 cntlid, | |
283 | struct nvmet_req *req, struct nvmet_ctrl **ret); | |
284 | void nvmet_ctrl_put(struct nvmet_ctrl *ctrl); | |
64a0ca88 | 285 | u16 nvmet_check_ctrl_status(struct nvmet_req *req, struct nvme_command *cmd); |
a07b4970 CH |
286 | |
287 | struct nvmet_subsys *nvmet_subsys_alloc(const char *subsysnqn, | |
288 | enum nvme_subsys_type type); | |
289 | void nvmet_subsys_put(struct nvmet_subsys *subsys); | |
344770b0 | 290 | void nvmet_subsys_del_ctrls(struct nvmet_subsys *subsys); |
a07b4970 CH |
291 | |
292 | struct nvmet_ns *nvmet_find_namespace(struct nvmet_ctrl *ctrl, __le32 nsid); | |
293 | void nvmet_put_namespace(struct nvmet_ns *ns); | |
294 | int nvmet_ns_enable(struct nvmet_ns *ns); | |
295 | void nvmet_ns_disable(struct nvmet_ns *ns); | |
296 | struct nvmet_ns *nvmet_ns_alloc(struct nvmet_subsys *subsys, u32 nsid); | |
297 | void nvmet_ns_free(struct nvmet_ns *ns); | |
298 | ||
299 | int nvmet_register_transport(struct nvmet_fabrics_ops *ops); | |
300 | void nvmet_unregister_transport(struct nvmet_fabrics_ops *ops); | |
301 | ||
302 | int nvmet_enable_port(struct nvmet_port *port); | |
303 | void nvmet_disable_port(struct nvmet_port *port); | |
304 | ||
305 | void nvmet_referral_enable(struct nvmet_port *parent, struct nvmet_port *port); | |
306 | void nvmet_referral_disable(struct nvmet_port *port); | |
307 | ||
308 | u16 nvmet_copy_to_sgl(struct nvmet_req *req, off_t off, const void *buf, | |
309 | size_t len); | |
310 | u16 nvmet_copy_from_sgl(struct nvmet_req *req, off_t off, void *buf, | |
311 | size_t len); | |
312 | ||
313 | u32 nvmet_get_log_page_len(struct nvme_command *cmd); | |
314 | ||
315 | #define NVMET_QUEUE_SIZE 1024 | |
316 | #define NVMET_NR_QUEUES 64 | |
317 | #define NVMET_MAX_CMD NVMET_QUEUE_SIZE | |
318 | #define NVMET_KAS 10 | |
319 | #define NVMET_DISC_KATO 120 | |
320 | ||
321 | int __init nvmet_init_configfs(void); | |
322 | void __exit nvmet_exit_configfs(void); | |
323 | ||
324 | int __init nvmet_init_discovery(void); | |
325 | void nvmet_exit_discovery(void); | |
326 | ||
327 | extern struct nvmet_subsys *nvmet_disc_subsys; | |
328 | extern u64 nvmet_genctr; | |
329 | extern struct rw_semaphore nvmet_config_sem; | |
330 | ||
331 | bool nvmet_host_allowed(struct nvmet_req *req, struct nvmet_subsys *subsys, | |
332 | const char *hostnqn); | |
333 | ||
334 | #endif /* _NVMET_H */ |