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/uuid.h>
25 #include <linux/nvme.h>
26 #include <linux/configfs.h>
27 #include <linux/rcupdate.h>
28 #include <linux/blkdev.h>
30 #define NVMET_ASYNC_EVENTS 4
31 #define NVMET_ERROR_LOG_SLOTS 128
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()
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)))
43 struct list_head dev_link;
44 struct percpu_ref ref;
45 struct block_device *bdev;
54 struct nvmet_subsys *subsys;
55 const char *device_path;
57 struct config_group device_group;
58 struct config_group group;
60 struct completion disable_done;
62 struct kmem_cache *bvec_cache;
65 static inline struct nvmet_ns *to_nvmet_ns(struct config_item *item)
67 return container_of(to_config_group(item), struct nvmet_ns, group);
76 struct nvmet_ctrl *ctrl;
77 struct percpu_ref ref;
81 struct completion free_done;
82 struct completion confirm_done;
86 * struct nvmet_port - Common structure to keep port
87 * information for the target.
88 * @entry: Entry into referrals or transport list.
89 * @disc_addr: Address information is stored in a format defined
90 * for a discovery log page entry.
91 * @group: ConfigFS group for this element's folder.
92 * @priv: Private data for the transport.
95 struct list_head entry;
96 struct nvmf_disc_rsp_page_entry disc_addr;
97 struct config_group group;
98 struct config_group subsys_group;
99 struct list_head subsystems;
100 struct config_group referrals_group;
101 struct list_head referrals;
106 static inline struct nvmet_port *to_nvmet_port(struct config_item *item)
108 return container_of(to_config_group(item), struct nvmet_port,
113 struct nvmet_subsys *subsys;
114 struct nvmet_cq **cqs;
115 struct nvmet_sq **sqs;
126 struct nvmet_req *async_event_cmds[NVMET_ASYNC_EVENTS];
127 unsigned int nr_async_event_cmds;
128 struct list_head async_events;
129 struct work_struct async_event_work;
131 struct list_head subsys_entry;
133 struct delayed_work ka_work;
134 struct work_struct fatal_err_work;
136 const struct nvmet_fabrics_ops *ops;
138 char subsysnqn[NVMF_NQN_FIELD_LEN];
139 char hostnqn[NVMF_NQN_FIELD_LEN];
142 struct nvmet_subsys {
143 enum nvme_subsys_type type;
148 struct list_head namespaces;
149 unsigned int max_nsid;
151 struct list_head ctrls;
153 struct list_head hosts;
162 struct config_group group;
164 struct config_group namespaces_group;
165 struct config_group allowed_hosts_group;
168 static inline struct nvmet_subsys *to_subsys(struct config_item *item)
170 return container_of(to_config_group(item), struct nvmet_subsys, group);
173 static inline struct nvmet_subsys *namespaces_to_subsys(
174 struct config_item *item)
176 return container_of(to_config_group(item), struct nvmet_subsys,
181 struct config_group group;
184 static inline struct nvmet_host *to_host(struct config_item *item)
186 return container_of(to_config_group(item), struct nvmet_host, group);
189 static inline char *nvmet_host_name(struct nvmet_host *host)
191 return config_item_name(&host->group.cg_item);
194 struct nvmet_host_link {
195 struct list_head entry;
196 struct nvmet_host *host;
199 struct nvmet_subsys_link {
200 struct list_head entry;
201 struct nvmet_subsys *subsys;
205 struct nvmet_fabrics_ops {
206 struct module *owner;
208 unsigned int sqe_inline_size;
210 bool has_keyed_sgls : 1;
211 void (*queue_response)(struct nvmet_req *req);
212 int (*add_port)(struct nvmet_port *port);
213 void (*remove_port)(struct nvmet_port *port);
214 void (*delete_ctrl)(struct nvmet_ctrl *ctrl);
215 void (*disc_traddr)(struct nvmet_req *req,
216 struct nvmet_port *port, char *traddr);
219 #define NVMET_MAX_INLINE_BIOVEC 8
222 struct nvme_command *cmd;
223 struct nvme_completion *rsp;
227 struct scatterlist *sg;
228 struct bio_vec inline_bvec[NVMET_MAX_INLINE_BIOVEC];
231 struct bio inline_bio;
236 struct bio_vec *bvec;
237 struct work_struct work;
241 /* data length as parsed from the command: */
243 /* data length as parsed from the SGL descriptor: */
246 struct nvmet_port *port;
248 void (*execute)(struct nvmet_req *req);
249 const struct nvmet_fabrics_ops *ops;
252 static inline void nvmet_set_status(struct nvmet_req *req, u16 status)
254 req->rsp->status = cpu_to_le16(status << 1);
257 static inline void nvmet_set_result(struct nvmet_req *req, u32 result)
259 req->rsp->result.u32 = cpu_to_le32(result);
263 * NVMe command writes actually are DMA reads for us on the target side.
265 static inline enum dma_data_direction
266 nvmet_data_dir(struct nvmet_req *req)
268 return nvme_is_write(req->cmd) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
271 struct nvmet_async_event {
272 struct list_head entry;
278 u16 nvmet_parse_connect_cmd(struct nvmet_req *req);
279 u16 nvmet_bdev_parse_io_cmd(struct nvmet_req *req);
280 u16 nvmet_file_parse_io_cmd(struct nvmet_req *req);
281 u16 nvmet_parse_admin_cmd(struct nvmet_req *req);
282 u16 nvmet_parse_discovery_cmd(struct nvmet_req *req);
283 u16 nvmet_parse_fabrics_cmd(struct nvmet_req *req);
285 bool nvmet_req_init(struct nvmet_req *req, struct nvmet_cq *cq,
286 struct nvmet_sq *sq, const struct nvmet_fabrics_ops *ops);
287 void nvmet_req_uninit(struct nvmet_req *req);
288 void nvmet_req_execute(struct nvmet_req *req);
289 void nvmet_req_complete(struct nvmet_req *req, u16 status);
291 void nvmet_cq_setup(struct nvmet_ctrl *ctrl, struct nvmet_cq *cq, u16 qid,
293 void nvmet_sq_setup(struct nvmet_ctrl *ctrl, struct nvmet_sq *sq, u16 qid,
295 void nvmet_sq_destroy(struct nvmet_sq *sq);
296 int nvmet_sq_init(struct nvmet_sq *sq);
298 void nvmet_ctrl_fatal_error(struct nvmet_ctrl *ctrl);
300 void nvmet_update_cc(struct nvmet_ctrl *ctrl, u32 new);
301 u16 nvmet_alloc_ctrl(const char *subsysnqn, const char *hostnqn,
302 struct nvmet_req *req, u32 kato, struct nvmet_ctrl **ctrlp);
303 u16 nvmet_ctrl_find_get(const char *subsysnqn, const char *hostnqn, u16 cntlid,
304 struct nvmet_req *req, struct nvmet_ctrl **ret);
305 void nvmet_ctrl_put(struct nvmet_ctrl *ctrl);
306 u16 nvmet_check_ctrl_status(struct nvmet_req *req, struct nvme_command *cmd);
308 struct nvmet_subsys *nvmet_subsys_alloc(const char *subsysnqn,
309 enum nvme_subsys_type type);
310 void nvmet_subsys_put(struct nvmet_subsys *subsys);
311 void nvmet_subsys_del_ctrls(struct nvmet_subsys *subsys);
313 struct nvmet_ns *nvmet_find_namespace(struct nvmet_ctrl *ctrl, __le32 nsid);
314 void nvmet_put_namespace(struct nvmet_ns *ns);
315 int nvmet_ns_enable(struct nvmet_ns *ns);
316 void nvmet_ns_disable(struct nvmet_ns *ns);
317 struct nvmet_ns *nvmet_ns_alloc(struct nvmet_subsys *subsys, u32 nsid);
318 void nvmet_ns_free(struct nvmet_ns *ns);
320 int nvmet_register_transport(const struct nvmet_fabrics_ops *ops);
321 void nvmet_unregister_transport(const struct nvmet_fabrics_ops *ops);
323 int nvmet_enable_port(struct nvmet_port *port);
324 void nvmet_disable_port(struct nvmet_port *port);
326 void nvmet_referral_enable(struct nvmet_port *parent, struct nvmet_port *port);
327 void nvmet_referral_disable(struct nvmet_port *port);
329 u16 nvmet_copy_to_sgl(struct nvmet_req *req, off_t off, const void *buf,
331 u16 nvmet_copy_from_sgl(struct nvmet_req *req, off_t off, void *buf,
333 u16 nvmet_zero_sgl(struct nvmet_req *req, off_t off, size_t len);
335 u32 nvmet_get_log_page_len(struct nvme_command *cmd);
337 #define NVMET_QUEUE_SIZE 1024
338 #define NVMET_NR_QUEUES 128
339 #define NVMET_MAX_CMD NVMET_QUEUE_SIZE
341 #define NVMET_DISC_KATO 120
343 int __init nvmet_init_configfs(void);
344 void __exit nvmet_exit_configfs(void);
346 int __init nvmet_init_discovery(void);
347 void nvmet_exit_discovery(void);
349 extern struct nvmet_subsys *nvmet_disc_subsys;
350 extern u64 nvmet_genctr;
351 extern struct rw_semaphore nvmet_config_sem;
353 bool nvmet_host_allowed(struct nvmet_req *req, struct nvmet_subsys *subsys,
354 const char *hostnqn);
356 int nvmet_bdev_ns_enable(struct nvmet_ns *ns);
357 int nvmet_file_ns_enable(struct nvmet_ns *ns);
358 void nvmet_bdev_ns_disable(struct nvmet_ns *ns);
359 void nvmet_file_ns_disable(struct nvmet_ns *ns);
361 static inline u32 nvmet_rw_len(struct nvmet_req *req)
363 return ((u32)le16_to_cpu(req->cmd->rw.length) + 1) <<
364 req->ns->blksize_shift;
366 #endif /* _NVMET_H */