1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * iSCSI transport class definitions 4 * 5 * Copyright (C) IBM Corporation, 2004 6 * Copyright (C) Mike Christie, 2004 - 2006 7 * Copyright (C) Dmitry Yusupov, 2004 - 2005 8 * Copyright (C) Alex Aizman, 2004 - 2005 9 */ 10 #ifndef SCSI_TRANSPORT_ISCSI_H 11 #define SCSI_TRANSPORT_ISCSI_H 12 13 #include <linux/device.h> 14 #include <linux/list.h> 15 #include <linux/mutex.h> 16 #include <scsi/iscsi_if.h> 17 18 struct scsi_transport_template; 19 struct iscsi_transport; 20 struct iscsi_endpoint; 21 struct Scsi_Host; 22 struct scsi_cmnd; 23 struct iscsi_cls_conn; 24 struct iscsi_conn; 25 struct iscsi_task; 26 struct sockaddr; 27 struct iscsi_iface; 28 struct bsg_job; 29 struct iscsi_bus_flash_session; 30 struct iscsi_bus_flash_conn; 31 32 /** 33 * struct iscsi_transport - iSCSI Transport template 34 * 35 * @name: transport name 36 * @caps: iSCSI Data-Path capabilities 37 * @create_session: create new iSCSI session object 38 * @destroy_session: destroy existing iSCSI session object 39 * @create_conn: create new iSCSI connection 40 * @bind_conn: associate this connection with existing iSCSI session 41 * and specified transport descriptor 42 * @destroy_conn: destroy inactive iSCSI connection 43 * @set_param: set iSCSI parameter. Return 0 on success, -ENODATA 44 * when param is not supported, and a -Exx value on other 45 * error. 46 * @get_param get iSCSI parameter. Must return number of bytes 47 * copied to buffer on success, -ENODATA when param 48 * is not supported, and a -Exx value on other error 49 * @start_conn: set connection to be operational 50 * @stop_conn: suspend/recover/terminate connection 51 * @send_pdu: send iSCSI PDU, Login, Logout, NOP-Out, Reject, Text. 52 * @session_recovery_timedout: notify LLD a block during recovery timed out 53 * @init_task: Initialize a iscsi_task and any internal structs. 54 * When offloading the data path, this is called from 55 * queuecommand with the session lock, or from the 56 * iscsi_conn_send_pdu context with the session lock. 57 * When not offloading the data path, this is called 58 * from the scsi work queue without the session lock. 59 * @xmit_task Requests LLD to transfer cmd task. Returns 0 or the 60 * number of bytes transferred on success, and -Exyz 61 * value on error. When offloading the data path, this 62 * is called from queuecommand with the session lock, or 63 * from the iscsi_conn_send_pdu context with the session 64 * lock. When not offloading the data path, this is called 65 * from the scsi work queue without the session lock. 66 * @cleanup_task: requests LLD to fail task. Called with session lock 67 * and after the connection has been suspended and 68 * terminated during recovery. If called 69 * from abort task then connection is not suspended 70 * or terminated but sk_callback_lock is held 71 * 72 * Template API provided by iSCSI Transport 73 */ 74 struct iscsi_transport { 75 struct module *owner; 76 char *name; 77 unsigned int caps; 78 79 struct iscsi_cls_session *(*create_session) (struct iscsi_endpoint *ep, 80 uint16_t cmds_max, uint16_t qdepth, 81 uint32_t sn); 82 void (*destroy_session) (struct iscsi_cls_session *session); 83 struct iscsi_cls_conn *(*create_conn) (struct iscsi_cls_session *sess, 84 uint32_t cid); 85 void (*unbind_conn) (struct iscsi_cls_conn *conn, bool is_active); 86 int (*bind_conn) (struct iscsi_cls_session *session, 87 struct iscsi_cls_conn *cls_conn, 88 uint64_t transport_eph, int is_leading); 89 int (*start_conn) (struct iscsi_cls_conn *conn); 90 void (*stop_conn) (struct iscsi_cls_conn *conn, int flag); 91 void (*destroy_conn) (struct iscsi_cls_conn *conn); 92 int (*set_param) (struct iscsi_cls_conn *conn, enum iscsi_param param, 93 char *buf, int buflen); 94 int (*get_ep_param) (struct iscsi_endpoint *ep, enum iscsi_param param, 95 char *buf); 96 int (*get_conn_param) (struct iscsi_cls_conn *conn, 97 enum iscsi_param param, char *buf); 98 int (*get_session_param) (struct iscsi_cls_session *session, 99 enum iscsi_param param, char *buf); 100 int (*get_host_param) (struct Scsi_Host *shost, 101 enum iscsi_host_param param, char *buf); 102 int (*set_host_param) (struct Scsi_Host *shost, 103 enum iscsi_host_param param, char *buf, 104 int buflen); 105 int (*send_pdu) (struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr, 106 char *data, uint32_t data_size); 107 void (*get_stats) (struct iscsi_cls_conn *conn, 108 struct iscsi_stats *stats); 109 110 int (*init_task) (struct iscsi_task *task); 111 int (*xmit_task) (struct iscsi_task *task); 112 void (*cleanup_task) (struct iscsi_task *task); 113 114 int (*alloc_pdu) (struct iscsi_task *task, uint8_t opcode); 115 int (*xmit_pdu) (struct iscsi_task *task); 116 int (*init_pdu) (struct iscsi_task *task, unsigned int offset, 117 unsigned int count); 118 void (*parse_pdu_itt) (struct iscsi_conn *conn, itt_t itt, 119 int *index, int *age); 120 121 void (*session_recovery_timedout) (struct iscsi_cls_session *session); 122 struct iscsi_endpoint *(*ep_connect) (struct Scsi_Host *shost, 123 struct sockaddr *dst_addr, 124 int non_blocking); 125 int (*ep_poll) (struct iscsi_endpoint *ep, int timeout_ms); 126 void (*ep_disconnect) (struct iscsi_endpoint *ep); 127 int (*tgt_dscvr) (struct Scsi_Host *shost, enum iscsi_tgt_dscvr type, 128 uint32_t enable, struct sockaddr *dst_addr); 129 int (*set_path) (struct Scsi_Host *shost, struct iscsi_path *params); 130 int (*set_iface_param) (struct Scsi_Host *shost, void *data, 131 uint32_t len); 132 int (*get_iface_param) (struct iscsi_iface *iface, 133 enum iscsi_param_type param_type, 134 int param, char *buf); 135 umode_t (*attr_is_visible)(int param_type, int param); 136 int (*bsg_request)(struct bsg_job *job); 137 int (*send_ping) (struct Scsi_Host *shost, uint32_t iface_num, 138 uint32_t iface_type, uint32_t payload_size, 139 uint32_t pid, struct sockaddr *dst_addr); 140 int (*get_chap) (struct Scsi_Host *shost, uint16_t chap_tbl_idx, 141 uint32_t *num_entries, char *buf); 142 int (*delete_chap) (struct Scsi_Host *shost, uint16_t chap_tbl_idx); 143 int (*set_chap) (struct Scsi_Host *shost, void *data, int len); 144 int (*get_flashnode_param) (struct iscsi_bus_flash_session *fnode_sess, 145 int param, char *buf); 146 int (*set_flashnode_param) (struct iscsi_bus_flash_session *fnode_sess, 147 struct iscsi_bus_flash_conn *fnode_conn, 148 void *data, int len); 149 int (*new_flashnode) (struct Scsi_Host *shost, const char *buf, 150 int len); 151 int (*del_flashnode) (struct iscsi_bus_flash_session *fnode_sess); 152 int (*login_flashnode) (struct iscsi_bus_flash_session *fnode_sess, 153 struct iscsi_bus_flash_conn *fnode_conn); 154 int (*logout_flashnode) (struct iscsi_bus_flash_session *fnode_sess, 155 struct iscsi_bus_flash_conn *fnode_conn); 156 int (*logout_flashnode_sid) (struct iscsi_cls_session *cls_sess); 157 int (*get_host_stats) (struct Scsi_Host *shost, char *buf, int len); 158 u8 (*check_protection)(struct iscsi_task *task, sector_t *sector); 159 }; 160 161 /* 162 * transport registration upcalls 163 */ 164 extern struct scsi_transport_template *iscsi_register_transport(struct iscsi_transport *tt); 165 extern int iscsi_unregister_transport(struct iscsi_transport *tt); 166 167 /* 168 * control plane upcalls 169 */ 170 extern void iscsi_conn_error_event(struct iscsi_cls_conn *conn, 171 enum iscsi_err error); 172 extern void iscsi_conn_login_event(struct iscsi_cls_conn *conn, 173 enum iscsi_conn_state state); 174 extern int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr, 175 char *data, uint32_t data_size); 176 177 extern int iscsi_offload_mesg(struct Scsi_Host *shost, 178 struct iscsi_transport *transport, uint32_t type, 179 char *data, uint16_t data_size); 180 181 extern void iscsi_post_host_event(uint32_t host_no, 182 struct iscsi_transport *transport, 183 enum iscsi_host_event_code code, 184 uint32_t data_size, 185 uint8_t *data); 186 187 extern void iscsi_ping_comp_event(uint32_t host_no, 188 struct iscsi_transport *transport, 189 uint32_t status, uint32_t pid, 190 uint32_t data_size, uint8_t *data); 191 192 /* iscsi class connection state */ 193 enum iscsi_connection_state { 194 ISCSI_CONN_UP = 0, 195 ISCSI_CONN_DOWN, 196 ISCSI_CONN_FAILED, 197 ISCSI_CONN_BOUND, 198 }; 199 200 #define ISCSI_CLS_CONN_BIT_CLEANUP 1 201 202 struct iscsi_cls_conn { 203 struct list_head conn_list; /* item in connlist */ 204 void *dd_data; /* LLD private data */ 205 struct iscsi_transport *transport; 206 uint32_t cid; /* connection id */ 207 /* 208 * This protects the conn startup and binding/unbinding of the ep to 209 * the conn. Unbinding includes ep_disconnect and stop_conn. 210 */ 211 struct mutex ep_mutex; 212 struct iscsi_endpoint *ep; 213 214 unsigned long flags; 215 struct work_struct cleanup_work; 216 217 struct device dev; /* sysfs transport/container device */ 218 enum iscsi_connection_state state; 219 }; 220 221 #define iscsi_dev_to_conn(_dev) \ 222 container_of(_dev, struct iscsi_cls_conn, dev) 223 224 #define transport_class_to_conn(_cdev) \ 225 iscsi_dev_to_conn(_cdev->parent) 226 227 #define iscsi_conn_to_session(_conn) \ 228 iscsi_dev_to_session(_conn->dev.parent) 229 230 /* iscsi class session state */ 231 enum { 232 ISCSI_SESSION_LOGGED_IN, 233 ISCSI_SESSION_FAILED, 234 ISCSI_SESSION_FREE, 235 }; 236 237 #define ISCSI_MAX_TARGET -1 238 239 struct iscsi_cls_session { 240 struct list_head sess_list; /* item in session_list */ 241 struct iscsi_transport *transport; 242 spinlock_t lock; 243 struct work_struct block_work; 244 struct work_struct unblock_work; 245 struct work_struct scan_work; 246 struct work_struct unbind_work; 247 struct work_struct destroy_work; 248 249 /* recovery fields */ 250 int recovery_tmo; 251 bool recovery_tmo_sysfs_override; 252 struct delayed_work recovery_work; 253 254 struct workqueue_struct *workq; 255 256 unsigned int target_id; 257 bool ida_used; 258 259 /* 260 * pid of userspace process that created session or -1 if 261 * created by the kernel. 262 */ 263 pid_t creator; 264 int state; 265 int sid; /* session id */ 266 void *dd_data; /* LLD private data */ 267 struct device dev; /* sysfs transport/container device */ 268 }; 269 270 #define iscsi_dev_to_session(_dev) \ 271 container_of(_dev, struct iscsi_cls_session, dev) 272 273 #define transport_class_to_session(_cdev) \ 274 iscsi_dev_to_session(_cdev->parent) 275 276 #define iscsi_session_to_shost(_session) \ 277 dev_to_shost(_session->dev.parent) 278 279 #define starget_to_session(_stgt) \ 280 iscsi_dev_to_session(_stgt->dev.parent) 281 282 struct iscsi_cls_host { 283 struct mutex mutex; 284 struct request_queue *bsg_q; 285 uint32_t port_speed; 286 uint32_t port_state; 287 }; 288 289 #define iscsi_job_to_shost(_job) \ 290 dev_to_shost(_job->dev) 291 292 extern void iscsi_host_for_each_session(struct Scsi_Host *shost, 293 void (*fn)(struct iscsi_cls_session *)); 294 295 struct iscsi_endpoint { 296 void *dd_data; /* LLD private data */ 297 struct device dev; 298 uint64_t id; 299 struct iscsi_cls_conn *conn; 300 }; 301 302 struct iscsi_iface { 303 struct device dev; 304 struct iscsi_transport *transport; 305 uint32_t iface_type; /* IPv4 or IPv6 */ 306 uint32_t iface_num; /* iface number, 0 - n */ 307 void *dd_data; /* LLD private data */ 308 }; 309 310 #define iscsi_dev_to_iface(_dev) \ 311 container_of(_dev, struct iscsi_iface, dev) 312 313 #define iscsi_iface_to_shost(_iface) \ 314 dev_to_shost(_iface->dev.parent) 315 316 317 struct iscsi_bus_flash_conn { 318 struct list_head conn_list; /* item in connlist */ 319 void *dd_data; /* LLD private data */ 320 struct iscsi_transport *transport; 321 struct device dev; /* sysfs transport/container device */ 322 /* iscsi connection parameters */ 323 uint32_t exp_statsn; 324 uint32_t statsn; 325 unsigned max_recv_dlength; /* initiator_max_recv_dsl*/ 326 unsigned max_xmit_dlength; /* target_max_recv_dsl */ 327 unsigned max_segment_size; 328 unsigned tcp_xmit_wsf; 329 unsigned tcp_recv_wsf; 330 int hdrdgst_en; 331 int datadgst_en; 332 int port; 333 char *ipaddress; 334 char *link_local_ipv6_addr; 335 char *redirect_ipaddr; 336 uint16_t keepalive_timeout; 337 uint16_t local_port; 338 uint8_t snack_req_en; 339 /* tcp timestamp negotiation status */ 340 uint8_t tcp_timestamp_stat; 341 uint8_t tcp_nagle_disable; 342 /* tcp window scale factor */ 343 uint8_t tcp_wsf_disable; 344 uint8_t tcp_timer_scale; 345 uint8_t tcp_timestamp_en; 346 uint8_t ipv4_tos; 347 uint8_t ipv6_traffic_class; 348 uint8_t ipv6_flow_label; 349 uint8_t fragment_disable; 350 /* Link local IPv6 address is assigned by firmware or driver */ 351 uint8_t is_fw_assigned_ipv6; 352 }; 353 354 #define iscsi_dev_to_flash_conn(_dev) \ 355 container_of(_dev, struct iscsi_bus_flash_conn, dev) 356 357 #define iscsi_flash_conn_to_flash_session(_conn) \ 358 iscsi_dev_to_flash_session(_conn->dev.parent) 359 360 #define ISID_SIZE 6 361 362 struct iscsi_bus_flash_session { 363 struct list_head sess_list; /* item in session_list */ 364 struct iscsi_transport *transport; 365 unsigned int target_id; 366 int flash_state; /* persistent or non-persistent */ 367 void *dd_data; /* LLD private data */ 368 struct device dev; /* sysfs transport/container device */ 369 /* iscsi session parameters */ 370 unsigned first_burst; 371 unsigned max_burst; 372 unsigned short max_r2t; 373 int default_taskmgmt_timeout; 374 int initial_r2t_en; 375 int imm_data_en; 376 int time2wait; 377 int time2retain; 378 int pdu_inorder_en; 379 int dataseq_inorder_en; 380 int erl; 381 int tpgt; 382 char *username; 383 char *username_in; 384 char *password; 385 char *password_in; 386 char *targetname; 387 char *targetalias; 388 char *portal_type; 389 uint16_t tsid; 390 uint16_t chap_in_idx; 391 uint16_t chap_out_idx; 392 /* index of iSCSI discovery session if the entry is 393 * discovered by iSCSI discovery session 394 */ 395 uint16_t discovery_parent_idx; 396 /* indicates if discovery was done through iSNS discovery service 397 * or through sendTarget */ 398 uint16_t discovery_parent_type; 399 /* Firmware auto sendtarget discovery disable */ 400 uint8_t auto_snd_tgt_disable; 401 uint8_t discovery_sess; 402 /* indicates if this flashnode entry is enabled or disabled */ 403 uint8_t entry_state; 404 uint8_t chap_auth_en; 405 /* enables firmware to auto logout the discovery session on discovery 406 * completion 407 */ 408 uint8_t discovery_logout_en; 409 uint8_t bidi_chap_en; 410 /* makes authentication for discovery session optional */ 411 uint8_t discovery_auth_optional; 412 uint8_t isid[ISID_SIZE]; 413 uint8_t is_boot_target; 414 }; 415 416 #define iscsi_dev_to_flash_session(_dev) \ 417 container_of(_dev, struct iscsi_bus_flash_session, dev) 418 419 #define iscsi_flash_session_to_shost(_session) \ 420 dev_to_shost(_session->dev.parent) 421 422 /* 423 * session and connection functions that can be used by HW iSCSI LLDs 424 */ 425 #define iscsi_cls_session_printk(prefix, _cls_session, fmt, a...) \ 426 dev_printk(prefix, &(_cls_session)->dev, fmt, ##a) 427 428 #define iscsi_cls_conn_printk(prefix, _cls_conn, fmt, a...) \ 429 dev_printk(prefix, &(_cls_conn)->dev, fmt, ##a) 430 431 extern int iscsi_session_chkready(struct iscsi_cls_session *session); 432 extern int iscsi_is_session_online(struct iscsi_cls_session *session); 433 extern struct iscsi_cls_session *iscsi_alloc_session(struct Scsi_Host *shost, 434 struct iscsi_transport *transport, int dd_size); 435 extern int iscsi_add_session(struct iscsi_cls_session *session, 436 unsigned int target_id); 437 extern int iscsi_session_event(struct iscsi_cls_session *session, 438 enum iscsi_uevent_e event); 439 extern struct iscsi_cls_session *iscsi_create_session(struct Scsi_Host *shost, 440 struct iscsi_transport *t, 441 int dd_size, 442 unsigned int target_id); 443 extern void iscsi_remove_session(struct iscsi_cls_session *session); 444 extern void iscsi_free_session(struct iscsi_cls_session *session); 445 extern struct iscsi_cls_conn *iscsi_create_conn(struct iscsi_cls_session *sess, 446 int dd_size, uint32_t cid); 447 extern void iscsi_put_conn(struct iscsi_cls_conn *conn); 448 extern void iscsi_get_conn(struct iscsi_cls_conn *conn); 449 extern int iscsi_destroy_conn(struct iscsi_cls_conn *conn); 450 extern void iscsi_unblock_session(struct iscsi_cls_session *session); 451 extern void iscsi_block_session(struct iscsi_cls_session *session); 452 extern struct iscsi_endpoint *iscsi_create_endpoint(int dd_size); 453 extern void iscsi_destroy_endpoint(struct iscsi_endpoint *ep); 454 extern struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle); 455 extern void iscsi_put_endpoint(struct iscsi_endpoint *ep); 456 extern int iscsi_block_scsi_eh(struct scsi_cmnd *cmd); 457 extern struct iscsi_iface *iscsi_create_iface(struct Scsi_Host *shost, 458 struct iscsi_transport *t, 459 uint32_t iface_type, 460 uint32_t iface_num, int dd_size); 461 extern void iscsi_destroy_iface(struct iscsi_iface *iface); 462 extern struct iscsi_iface *iscsi_lookup_iface(int handle); 463 extern char *iscsi_get_port_speed_name(struct Scsi_Host *shost); 464 extern char *iscsi_get_port_state_name(struct Scsi_Host *shost); 465 extern int iscsi_is_session_dev(const struct device *dev); 466 467 extern char *iscsi_get_discovery_parent_name(int parent_type); 468 extern struct device * 469 iscsi_find_flashnode(struct Scsi_Host *shost, void *data, 470 int (*fn)(struct device *dev, void *data)); 471 472 extern struct iscsi_bus_flash_session * 473 iscsi_create_flashnode_sess(struct Scsi_Host *shost, int index, 474 struct iscsi_transport *transport, int dd_size); 475 476 extern struct iscsi_bus_flash_conn * 477 iscsi_create_flashnode_conn(struct Scsi_Host *shost, 478 struct iscsi_bus_flash_session *fnode_sess, 479 struct iscsi_transport *transport, int dd_size); 480 481 extern void 482 iscsi_destroy_flashnode_sess(struct iscsi_bus_flash_session *fnode_sess); 483 484 extern void iscsi_destroy_all_flashnode(struct Scsi_Host *shost); 485 extern int iscsi_flashnode_bus_match(struct device *dev, 486 struct device_driver *drv); 487 extern struct device * 488 iscsi_find_flashnode_sess(struct Scsi_Host *shost, void *data, 489 int (*fn)(struct device *dev, void *data)); 490 extern struct device * 491 iscsi_find_flashnode_conn(struct iscsi_bus_flash_session *fnode_sess); 492 493 extern char * 494 iscsi_get_ipaddress_state_name(enum iscsi_ipaddress_state port_state); 495 extern char *iscsi_get_router_state_name(enum iscsi_router_state router_state); 496 #endif 497