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> 24 #include <linux/nvme.h> 25 #include <linux/configfs.h> 26 #include <linux/rcupdate.h> 27 #include <linux/blkdev.h> 28 29 #define NVMET_ASYNC_EVENTS 4 30 #define NVMET_ERROR_LOG_SLOTS 128 31 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() 35 */ 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))) 40 41 struct nvmet_ns { 42 struct list_head dev_link; 43 struct percpu_ref ref; 44 struct block_device *bdev; 45 u32 nsid; 46 u32 blksize_shift; 47 loff_t size; 48 u8 nguid[16]; 49 50 bool enabled; 51 struct nvmet_subsys *subsys; 52 const char *device_path; 53 54 struct config_group device_group; 55 struct config_group group; 56 57 struct completion disable_done; 58 }; 59 60 static inline struct nvmet_ns *to_nvmet_ns(struct config_item *item) 61 { 62 return container_of(to_config_group(item), struct nvmet_ns, group); 63 } 64 65 struct nvmet_cq { 66 u16 qid; 67 u16 size; 68 }; 69 70 struct nvmet_sq { 71 struct nvmet_ctrl *ctrl; 72 struct percpu_ref ref; 73 u16 qid; 74 u16 size; 75 struct completion free_done; 76 }; 77 78 /** 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. 86 */ 87 struct nvmet_port { 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; 95 void *priv; 96 bool enabled; 97 }; 98 99 static inline struct nvmet_port *to_nvmet_port(struct config_item *item) 100 { 101 return container_of(to_config_group(item), struct nvmet_port, 102 group); 103 } 104 105 struct nvmet_ctrl { 106 struct nvmet_subsys *subsys; 107 struct nvmet_cq **cqs; 108 struct nvmet_sq **sqs; 109 110 struct mutex lock; 111 u64 cap; 112 u64 serial; 113 u32 cc; 114 u32 csts; 115 116 u16 cntlid; 117 u32 kato; 118 119 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; 123 124 struct list_head subsys_entry; 125 struct kref ref; 126 struct delayed_work ka_work; 127 struct work_struct fatal_err_work; 128 129 struct nvmet_fabrics_ops *ops; 130 131 char subsysnqn[NVMF_NQN_FIELD_LEN]; 132 char hostnqn[NVMF_NQN_FIELD_LEN]; 133 }; 134 135 struct nvmet_subsys { 136 enum nvme_subsys_type type; 137 138 struct mutex lock; 139 struct kref ref; 140 141 struct list_head namespaces; 142 unsigned int max_nsid; 143 144 struct list_head ctrls; 145 struct ida cntlid_ida; 146 147 struct list_head hosts; 148 bool allow_any_host; 149 150 u16 max_qid; 151 152 u64 ver; 153 char *subsysnqn; 154 155 struct config_group group; 156 157 struct config_group namespaces_group; 158 struct config_group allowed_hosts_group; 159 }; 160 161 static inline struct nvmet_subsys *to_subsys(struct config_item *item) 162 { 163 return container_of(to_config_group(item), struct nvmet_subsys, group); 164 } 165 166 static inline struct nvmet_subsys *namespaces_to_subsys( 167 struct config_item *item) 168 { 169 return container_of(to_config_group(item), struct nvmet_subsys, 170 namespaces_group); 171 } 172 173 struct nvmet_host { 174 struct config_group group; 175 }; 176 177 static inline struct nvmet_host *to_host(struct config_item *item) 178 { 179 return container_of(to_config_group(item), struct nvmet_host, group); 180 } 181 182 static inline char *nvmet_host_name(struct nvmet_host *host) 183 { 184 return config_item_name(&host->group.cg_item); 185 } 186 187 struct nvmet_host_link { 188 struct list_head entry; 189 struct nvmet_host *host; 190 }; 191 192 struct nvmet_subsys_link { 193 struct list_head entry; 194 struct nvmet_subsys *subsys; 195 }; 196 197 struct nvmet_req; 198 struct nvmet_fabrics_ops { 199 struct module *owner; 200 unsigned int type; 201 unsigned int sqe_inline_size; 202 unsigned int msdbd; 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); 208 }; 209 210 #define NVMET_MAX_INLINE_BIOVEC 8 211 212 struct nvmet_req { 213 struct nvme_command *cmd; 214 struct nvme_completion *rsp; 215 struct nvmet_sq *sq; 216 struct nvmet_cq *cq; 217 struct nvmet_ns *ns; 218 struct scatterlist *sg; 219 struct bio inline_bio; 220 struct bio_vec inline_bvec[NVMET_MAX_INLINE_BIOVEC]; 221 int sg_cnt; 222 size_t data_len; 223 224 struct nvmet_port *port; 225 226 void (*execute)(struct nvmet_req *req); 227 struct nvmet_fabrics_ops *ops; 228 }; 229 230 static inline void nvmet_set_status(struct nvmet_req *req, u16 status) 231 { 232 req->rsp->status = cpu_to_le16(status << 1); 233 } 234 235 static inline void nvmet_set_result(struct nvmet_req *req, u32 result) 236 { 237 req->rsp->result.u32 = cpu_to_le32(result); 238 } 239 240 /* 241 * NVMe command writes actually are DMA reads for us on the target side. 242 */ 243 static inline enum dma_data_direction 244 nvmet_data_dir(struct nvmet_req *req) 245 { 246 return nvme_is_write(req->cmd) ? DMA_FROM_DEVICE : DMA_TO_DEVICE; 247 } 248 249 struct nvmet_async_event { 250 struct list_head entry; 251 u8 event_type; 252 u8 event_info; 253 u8 log_page; 254 }; 255 256 int nvmet_parse_connect_cmd(struct nvmet_req *req); 257 int nvmet_parse_io_cmd(struct nvmet_req *req); 258 int nvmet_parse_admin_cmd(struct nvmet_req *req); 259 int nvmet_parse_discovery_cmd(struct nvmet_req *req); 260 int nvmet_parse_fabrics_cmd(struct nvmet_req *req); 261 262 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); 265 266 void nvmet_cq_setup(struct nvmet_ctrl *ctrl, struct nvmet_cq *cq, u16 qid, 267 u16 size); 268 void nvmet_sq_setup(struct nvmet_ctrl *ctrl, struct nvmet_sq *sq, u16 qid, 269 u16 size); 270 void nvmet_sq_destroy(struct nvmet_sq *sq); 271 int nvmet_sq_init(struct nvmet_sq *sq); 272 273 void nvmet_ctrl_fatal_error(struct nvmet_ctrl *ctrl); 274 275 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); 281 282 struct nvmet_subsys *nvmet_subsys_alloc(const char *subsysnqn, 283 enum nvme_subsys_type type); 284 void nvmet_subsys_put(struct nvmet_subsys *subsys); 285 286 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); 292 293 int nvmet_register_transport(struct nvmet_fabrics_ops *ops); 294 void nvmet_unregister_transport(struct nvmet_fabrics_ops *ops); 295 296 int nvmet_enable_port(struct nvmet_port *port); 297 void nvmet_disable_port(struct nvmet_port *port); 298 299 void nvmet_referral_enable(struct nvmet_port *parent, struct nvmet_port *port); 300 void nvmet_referral_disable(struct nvmet_port *port); 301 302 u16 nvmet_copy_to_sgl(struct nvmet_req *req, off_t off, const void *buf, 303 size_t len); 304 u16 nvmet_copy_from_sgl(struct nvmet_req *req, off_t off, void *buf, 305 size_t len); 306 307 u32 nvmet_get_log_page_len(struct nvme_command *cmd); 308 309 #define NVMET_QUEUE_SIZE 1024 310 #define NVMET_NR_QUEUES 64 311 #define NVMET_MAX_CMD NVMET_QUEUE_SIZE 312 #define NVMET_KAS 10 313 #define NVMET_DISC_KATO 120 314 315 int __init nvmet_init_configfs(void); 316 void __exit nvmet_exit_configfs(void); 317 318 int __init nvmet_init_discovery(void); 319 void nvmet_exit_discovery(void); 320 321 extern struct nvmet_subsys *nvmet_disc_subsys; 322 extern u64 nvmet_genctr; 323 extern struct rw_semaphore nvmet_config_sem; 324 325 bool nvmet_host_allowed(struct nvmet_req *req, struct nvmet_subsys *subsys, 326 const char *hostnqn); 327 328 #endif /* _NVMET_H */ 329