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 */