1 /* 2 * iSCSI transport class definitions 3 * 4 * Copyright (C) IBM Corporation, 2004 5 * Copyright (C) Mike Christie, 2004 - 2006 6 * Copyright (C) Dmitry Yusupov, 2004 - 2005 7 * Copyright (C) Alex Aizman, 2004 - 2005 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; either version 2 of the License, or 12 * (at your option) any later version. 13 * 14 * This program is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program; if not, write to the Free Software 21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 22 */ 23 #ifndef SCSI_TRANSPORT_ISCSI_H 24 #define SCSI_TRANSPORT_ISCSI_H 25 26 #include <linux/device.h> 27 #include <linux/list.h> 28 #include <linux/mutex.h> 29 #include <scsi/iscsi_if.h> 30 31 struct scsi_transport_template; 32 struct iscsi_transport; 33 struct iscsi_endpoint; 34 struct Scsi_Host; 35 struct scsi_cmnd; 36 struct iscsi_cls_conn; 37 struct iscsi_conn; 38 struct iscsi_task; 39 struct sockaddr; 40 struct iscsi_iface; 41 struct bsg_job; 42 struct iscsi_bus_flash_session; 43 struct iscsi_bus_flash_conn; 44 45 /** 46 * struct iscsi_transport - iSCSI Transport template 47 * 48 * @name: transport name 49 * @caps: iSCSI Data-Path capabilities 50 * @create_session: create new iSCSI session object 51 * @destroy_session: destroy existing iSCSI session object 52 * @create_conn: create new iSCSI connection 53 * @bind_conn: associate this connection with existing iSCSI session 54 * and specified transport descriptor 55 * @destroy_conn: destroy inactive iSCSI connection 56 * @set_param: set iSCSI parameter. Return 0 on success, -ENODATA 57 * when param is not supported, and a -Exx value on other 58 * error. 59 * @get_param get iSCSI parameter. Must return number of bytes 60 * copied to buffer on success, -ENODATA when param 61 * is not supported, and a -Exx value on other error 62 * @start_conn: set connection to be operational 63 * @stop_conn: suspend/recover/terminate connection 64 * @send_pdu: send iSCSI PDU, Login, Logout, NOP-Out, Reject, Text. 65 * @session_recovery_timedout: notify LLD a block during recovery timed out 66 * @init_task: Initialize a iscsi_task and any internal structs. 67 * When offloading the data path, this is called from 68 * queuecommand with the session lock, or from the 69 * iscsi_conn_send_pdu context with the session lock. 70 * When not offloading the data path, this is called 71 * from the scsi work queue without the session lock. 72 * @xmit_task Requests LLD to transfer cmd task. Returns 0 or the 73 * the number of bytes transferred on success, and -Exyz 74 * value on error. When offloading the data path, this 75 * is called from queuecommand with the session lock, or 76 * from the iscsi_conn_send_pdu context with the session 77 * lock. When not offloading the data path, this is called 78 * from the scsi work queue without the session lock. 79 * @cleanup_task: requests LLD to fail task. Called with session lock 80 * and after the connection has been suspended and 81 * terminated during recovery. If called 82 * from abort task then connection is not suspended 83 * or terminated but sk_callback_lock is held 84 * 85 * Template API provided by iSCSI Transport 86 */ 87 struct iscsi_transport { 88 struct module *owner; 89 char *name; 90 unsigned int caps; 91 92 struct iscsi_cls_session *(*create_session) (struct iscsi_endpoint *ep, 93 uint16_t cmds_max, uint16_t qdepth, 94 uint32_t sn); 95 void (*destroy_session) (struct iscsi_cls_session *session); 96 struct iscsi_cls_conn *(*create_conn) (struct iscsi_cls_session *sess, 97 uint32_t cid); 98 int (*bind_conn) (struct iscsi_cls_session *session, 99 struct iscsi_cls_conn *cls_conn, 100 uint64_t transport_eph, int is_leading); 101 int (*start_conn) (struct iscsi_cls_conn *conn); 102 void (*stop_conn) (struct iscsi_cls_conn *conn, int flag); 103 void (*destroy_conn) (struct iscsi_cls_conn *conn); 104 int (*set_param) (struct iscsi_cls_conn *conn, enum iscsi_param param, 105 char *buf, int buflen); 106 int (*get_ep_param) (struct iscsi_endpoint *ep, enum iscsi_param param, 107 char *buf); 108 int (*get_conn_param) (struct iscsi_cls_conn *conn, 109 enum iscsi_param param, char *buf); 110 int (*get_session_param) (struct iscsi_cls_session *session, 111 enum iscsi_param param, char *buf); 112 int (*get_host_param) (struct Scsi_Host *shost, 113 enum iscsi_host_param param, char *buf); 114 int (*set_host_param) (struct Scsi_Host *shost, 115 enum iscsi_host_param param, char *buf, 116 int buflen); 117 int (*send_pdu) (struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr, 118 char *data, uint32_t data_size); 119 void (*get_stats) (struct iscsi_cls_conn *conn, 120 struct iscsi_stats *stats); 121 122 int (*init_task) (struct iscsi_task *task); 123 int (*xmit_task) (struct iscsi_task *task); 124 void (*cleanup_task) (struct iscsi_task *task); 125 126 int (*alloc_pdu) (struct iscsi_task *task, uint8_t opcode); 127 int (*xmit_pdu) (struct iscsi_task *task); 128 int (*init_pdu) (struct iscsi_task *task, unsigned int offset, 129 unsigned int count); 130 void (*parse_pdu_itt) (struct iscsi_conn *conn, itt_t itt, 131 int *index, int *age); 132 133 void (*session_recovery_timedout) (struct iscsi_cls_session *session); 134 struct iscsi_endpoint *(*ep_connect) (struct Scsi_Host *shost, 135 struct sockaddr *dst_addr, 136 int non_blocking); 137 int (*ep_poll) (struct iscsi_endpoint *ep, int timeout_ms); 138 void (*ep_disconnect) (struct iscsi_endpoint *ep); 139 int (*tgt_dscvr) (struct Scsi_Host *shost, enum iscsi_tgt_dscvr type, 140 uint32_t enable, struct sockaddr *dst_addr); 141 int (*set_path) (struct Scsi_Host *shost, struct iscsi_path *params); 142 int (*set_iface_param) (struct Scsi_Host *shost, void *data, 143 uint32_t len); 144 int (*get_iface_param) (struct iscsi_iface *iface, 145 enum iscsi_param_type param_type, 146 int param, char *buf); 147 umode_t (*attr_is_visible)(int param_type, int param); 148 int (*bsg_request)(struct bsg_job *job); 149 int (*send_ping) (struct Scsi_Host *shost, uint32_t iface_num, 150 uint32_t iface_type, uint32_t payload_size, 151 uint32_t pid, struct sockaddr *dst_addr); 152 int (*get_chap) (struct Scsi_Host *shost, uint16_t chap_tbl_idx, 153 uint32_t *num_entries, char *buf); 154 int (*delete_chap) (struct Scsi_Host *shost, uint16_t chap_tbl_idx); 155 int (*set_chap) (struct Scsi_Host *shost, void *data, int len); 156 int (*get_flashnode_param) (struct iscsi_bus_flash_session *fnode_sess, 157 int param, char *buf); 158 int (*set_flashnode_param) (struct iscsi_bus_flash_session *fnode_sess, 159 struct iscsi_bus_flash_conn *fnode_conn, 160 void *data, int len); 161 int (*new_flashnode) (struct Scsi_Host *shost, const char *buf, 162 int len); 163 int (*del_flashnode) (struct iscsi_bus_flash_session *fnode_sess); 164 int (*login_flashnode) (struct iscsi_bus_flash_session *fnode_sess, 165 struct iscsi_bus_flash_conn *fnode_conn); 166 int (*logout_flashnode) (struct iscsi_bus_flash_session *fnode_sess, 167 struct iscsi_bus_flash_conn *fnode_conn); 168 int (*logout_flashnode_sid) (struct iscsi_cls_session *cls_sess); 169 }; 170 171 /* 172 * transport registration upcalls 173 */ 174 extern struct scsi_transport_template *iscsi_register_transport(struct iscsi_transport *tt); 175 extern int iscsi_unregister_transport(struct iscsi_transport *tt); 176 177 /* 178 * control plane upcalls 179 */ 180 extern void iscsi_conn_error_event(struct iscsi_cls_conn *conn, 181 enum iscsi_err error); 182 extern void iscsi_conn_login_event(struct iscsi_cls_conn *conn, 183 enum iscsi_conn_state state); 184 extern int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr, 185 char *data, uint32_t data_size); 186 187 extern int iscsi_offload_mesg(struct Scsi_Host *shost, 188 struct iscsi_transport *transport, uint32_t type, 189 char *data, uint16_t data_size); 190 191 extern void iscsi_post_host_event(uint32_t host_no, 192 struct iscsi_transport *transport, 193 enum iscsi_host_event_code code, 194 uint32_t data_size, 195 uint8_t *data); 196 197 extern void iscsi_ping_comp_event(uint32_t host_no, 198 struct iscsi_transport *transport, 199 uint32_t status, uint32_t pid, 200 uint32_t data_size, uint8_t *data); 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 struct mutex ep_mutex; 208 struct iscsi_endpoint *ep; 209 210 struct device dev; /* sysfs transport/container device */ 211 }; 212 213 #define iscsi_dev_to_conn(_dev) \ 214 container_of(_dev, struct iscsi_cls_conn, dev) 215 216 #define transport_class_to_conn(_cdev) \ 217 iscsi_dev_to_conn(_cdev->parent) 218 219 #define iscsi_conn_to_session(_conn) \ 220 iscsi_dev_to_session(_conn->dev.parent) 221 222 /* iscsi class session state */ 223 enum { 224 ISCSI_SESSION_LOGGED_IN, 225 ISCSI_SESSION_FAILED, 226 ISCSI_SESSION_FREE, 227 }; 228 229 #define ISCSI_MAX_TARGET -1 230 231 struct iscsi_cls_session { 232 struct list_head sess_list; /* item in session_list */ 233 struct iscsi_transport *transport; 234 spinlock_t lock; 235 struct work_struct block_work; 236 struct work_struct unblock_work; 237 struct work_struct scan_work; 238 struct work_struct unbind_work; 239 240 /* recovery fields */ 241 int recovery_tmo; 242 struct delayed_work recovery_work; 243 244 unsigned int target_id; 245 bool ida_used; 246 247 /* 248 * pid of userspace process that created session or -1 if 249 * created by the kernel. 250 */ 251 pid_t creator; 252 int state; 253 int sid; /* session id */ 254 void *dd_data; /* LLD private data */ 255 struct device dev; /* sysfs transport/container device */ 256 }; 257 258 #define iscsi_dev_to_session(_dev) \ 259 container_of(_dev, struct iscsi_cls_session, dev) 260 261 #define transport_class_to_session(_cdev) \ 262 iscsi_dev_to_session(_cdev->parent) 263 264 #define iscsi_session_to_shost(_session) \ 265 dev_to_shost(_session->dev.parent) 266 267 #define starget_to_session(_stgt) \ 268 iscsi_dev_to_session(_stgt->dev.parent) 269 270 struct iscsi_cls_host { 271 atomic_t nr_scans; 272 struct mutex mutex; 273 struct request_queue *bsg_q; 274 uint32_t port_speed; 275 uint32_t port_state; 276 }; 277 278 #define iscsi_job_to_shost(_job) \ 279 dev_to_shost(_job->dev) 280 281 extern void iscsi_host_for_each_session(struct Scsi_Host *shost, 282 void (*fn)(struct iscsi_cls_session *)); 283 284 struct iscsi_endpoint { 285 void *dd_data; /* LLD private data */ 286 struct device dev; 287 uint64_t id; 288 struct iscsi_cls_conn *conn; 289 }; 290 291 struct iscsi_iface { 292 struct device dev; 293 struct iscsi_transport *transport; 294 uint32_t iface_type; /* IPv4 or IPv6 */ 295 uint32_t iface_num; /* iface number, 0 - n */ 296 void *dd_data; /* LLD private data */ 297 }; 298 299 #define iscsi_dev_to_iface(_dev) \ 300 container_of(_dev, struct iscsi_iface, dev) 301 302 #define iscsi_iface_to_shost(_iface) \ 303 dev_to_shost(_iface->dev.parent) 304 305 306 struct iscsi_bus_flash_conn { 307 struct list_head conn_list; /* item in connlist */ 308 void *dd_data; /* LLD private data */ 309 struct iscsi_transport *transport; 310 struct device dev; /* sysfs transport/container device */ 311 /* iscsi connection parameters */ 312 uint32_t exp_statsn; 313 uint32_t statsn; 314 unsigned max_recv_dlength; /* initiator_max_recv_dsl*/ 315 unsigned max_xmit_dlength; /* target_max_recv_dsl */ 316 unsigned max_segment_size; 317 unsigned tcp_xmit_wsf; 318 unsigned tcp_recv_wsf; 319 int hdrdgst_en; 320 int datadgst_en; 321 int port; 322 char *ipaddress; 323 char *link_local_ipv6_addr; 324 char *redirect_ipaddr; 325 uint16_t keepalive_timeout; 326 uint16_t local_port; 327 uint8_t snack_req_en; 328 /* tcp timestamp negotiation status */ 329 uint8_t tcp_timestamp_stat; 330 uint8_t tcp_nagle_disable; 331 /* tcp window scale factor */ 332 uint8_t tcp_wsf_disable; 333 uint8_t tcp_timer_scale; 334 uint8_t tcp_timestamp_en; 335 uint8_t ipv4_tos; 336 uint8_t ipv6_traffic_class; 337 uint8_t ipv6_flow_label; 338 uint8_t fragment_disable; 339 /* Link local IPv6 address is assigned by firmware or driver */ 340 uint8_t is_fw_assigned_ipv6; 341 }; 342 343 #define iscsi_dev_to_flash_conn(_dev) \ 344 container_of(_dev, struct iscsi_bus_flash_conn, dev) 345 346 #define iscsi_flash_conn_to_flash_session(_conn) \ 347 iscsi_dev_to_flash_session(_conn->dev.parent) 348 349 #define ISID_SIZE 6 350 351 struct iscsi_bus_flash_session { 352 struct list_head sess_list; /* item in session_list */ 353 struct iscsi_transport *transport; 354 unsigned int target_id; 355 int flash_state; /* persistent or non-persistent */ 356 void *dd_data; /* LLD private data */ 357 struct device dev; /* sysfs transport/container device */ 358 /* iscsi session parameters */ 359 unsigned first_burst; 360 unsigned max_burst; 361 unsigned short max_r2t; 362 int default_taskmgmt_timeout; 363 int initial_r2t_en; 364 int imm_data_en; 365 int time2wait; 366 int time2retain; 367 int pdu_inorder_en; 368 int dataseq_inorder_en; 369 int erl; 370 int tpgt; 371 char *username; 372 char *username_in; 373 char *password; 374 char *password_in; 375 char *targetname; 376 char *targetalias; 377 char *portal_type; 378 uint16_t tsid; 379 uint16_t chap_in_idx; 380 uint16_t chap_out_idx; 381 /* index of iSCSI discovery session if the entry is 382 * discovered by iSCSI discovery session 383 */ 384 uint16_t discovery_parent_idx; 385 /* indicates if discovery was done through iSNS discovery service 386 * or through sendTarget */ 387 uint16_t discovery_parent_type; 388 /* Firmware auto sendtarget discovery disable */ 389 uint8_t auto_snd_tgt_disable; 390 uint8_t discovery_sess; 391 /* indicates if this flashnode entry is enabled or disabled */ 392 uint8_t entry_state; 393 uint8_t chap_auth_en; 394 /* enables firmware to auto logout the discovery session on discovery 395 * completion 396 */ 397 uint8_t discovery_logout_en; 398 uint8_t bidi_chap_en; 399 /* makes authentication for discovery session optional */ 400 uint8_t discovery_auth_optional; 401 uint8_t isid[ISID_SIZE]; 402 uint8_t is_boot_target; 403 }; 404 405 #define iscsi_dev_to_flash_session(_dev) \ 406 container_of(_dev, struct iscsi_bus_flash_session, dev) 407 408 #define iscsi_flash_session_to_shost(_session) \ 409 dev_to_shost(_session->dev.parent) 410 411 /* 412 * session and connection functions that can be used by HW iSCSI LLDs 413 */ 414 #define iscsi_cls_session_printk(prefix, _cls_session, fmt, a...) \ 415 dev_printk(prefix, &(_cls_session)->dev, fmt, ##a) 416 417 #define iscsi_cls_conn_printk(prefix, _cls_conn, fmt, a...) \ 418 dev_printk(prefix, &(_cls_conn)->dev, fmt, ##a) 419 420 extern int iscsi_session_chkready(struct iscsi_cls_session *session); 421 extern int iscsi_is_session_online(struct iscsi_cls_session *session); 422 extern struct iscsi_cls_session *iscsi_alloc_session(struct Scsi_Host *shost, 423 struct iscsi_transport *transport, int dd_size); 424 extern int iscsi_add_session(struct iscsi_cls_session *session, 425 unsigned int target_id); 426 extern int iscsi_session_event(struct iscsi_cls_session *session, 427 enum iscsi_uevent_e event); 428 extern struct iscsi_cls_session *iscsi_create_session(struct Scsi_Host *shost, 429 struct iscsi_transport *t, 430 int dd_size, 431 unsigned int target_id); 432 extern void iscsi_remove_session(struct iscsi_cls_session *session); 433 extern void iscsi_free_session(struct iscsi_cls_session *session); 434 extern int iscsi_destroy_session(struct iscsi_cls_session *session); 435 extern struct iscsi_cls_conn *iscsi_create_conn(struct iscsi_cls_session *sess, 436 int dd_size, uint32_t cid); 437 extern int iscsi_destroy_conn(struct iscsi_cls_conn *conn); 438 extern void iscsi_unblock_session(struct iscsi_cls_session *session); 439 extern void iscsi_block_session(struct iscsi_cls_session *session); 440 extern int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time); 441 extern struct iscsi_endpoint *iscsi_create_endpoint(int dd_size); 442 extern void iscsi_destroy_endpoint(struct iscsi_endpoint *ep); 443 extern struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle); 444 extern int iscsi_block_scsi_eh(struct scsi_cmnd *cmd); 445 extern struct iscsi_iface *iscsi_create_iface(struct Scsi_Host *shost, 446 struct iscsi_transport *t, 447 uint32_t iface_type, 448 uint32_t iface_num, int dd_size); 449 extern void iscsi_destroy_iface(struct iscsi_iface *iface); 450 extern struct iscsi_iface *iscsi_lookup_iface(int handle); 451 extern char *iscsi_get_port_speed_name(struct Scsi_Host *shost); 452 extern char *iscsi_get_port_state_name(struct Scsi_Host *shost); 453 extern int iscsi_is_session_dev(const struct device *dev); 454 455 extern char *iscsi_get_discovery_parent_name(int parent_type); 456 extern struct device * 457 iscsi_find_flashnode(struct Scsi_Host *shost, void *data, 458 int (*fn)(struct device *dev, void *data)); 459 460 extern struct iscsi_bus_flash_session * 461 iscsi_create_flashnode_sess(struct Scsi_Host *shost, int index, 462 struct iscsi_transport *transport, int dd_size); 463 464 extern struct iscsi_bus_flash_conn * 465 iscsi_create_flashnode_conn(struct Scsi_Host *shost, 466 struct iscsi_bus_flash_session *fnode_sess, 467 struct iscsi_transport *transport, int dd_size); 468 469 extern void 470 iscsi_destroy_flashnode_sess(struct iscsi_bus_flash_session *fnode_sess); 471 472 extern void iscsi_destroy_all_flashnode(struct Scsi_Host *shost); 473 extern int iscsi_flashnode_bus_match(struct device *dev, 474 struct device_driver *drv); 475 extern struct device * 476 iscsi_find_flashnode_sess(struct Scsi_Host *shost, void *data, 477 int (*fn)(struct device *dev, void *data)); 478 extern struct device * 479 iscsi_find_flashnode_conn(struct iscsi_bus_flash_session *fnode_sess); 480 481 #endif 482