1 /* 2 * iSCSI lib definitions 3 * 4 * Copyright (C) 2006 Red Hat, Inc. All rights reserved. 5 * Copyright (C) 2004 - 2006 Mike Christie 6 * Copyright (C) 2004 - 2005 Dmitry Yusupov 7 * Copyright (C) 2004 - 2005 Alex Aizman 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 LIBISCSI_H 24 #define LIBISCSI_H 25 26 #include <linux/types.h> 27 #include <linux/wait.h> 28 #include <linux/mutex.h> 29 #include <linux/timer.h> 30 #include <linux/workqueue.h> 31 #include <linux/kfifo.h> 32 #include <scsi/iscsi_proto.h> 33 #include <scsi/iscsi_if.h> 34 #include <scsi/scsi_transport_iscsi.h> 35 36 struct scsi_transport_template; 37 struct scsi_host_template; 38 struct scsi_device; 39 struct Scsi_Host; 40 struct scsi_target; 41 struct scsi_cmnd; 42 struct socket; 43 struct iscsi_transport; 44 struct iscsi_cls_session; 45 struct iscsi_cls_conn; 46 struct iscsi_session; 47 struct iscsi_nopin; 48 struct device; 49 50 #define ISCSI_DEF_XMIT_CMDS_MAX 128 /* must be power of 2 */ 51 #define ISCSI_MGMT_CMDS_MAX 15 52 53 #define ISCSI_DEF_CMD_PER_LUN 32 54 55 /* Task Mgmt states */ 56 enum { 57 TMF_INITIAL, 58 TMF_QUEUED, 59 TMF_SUCCESS, 60 TMF_FAILED, 61 TMF_TIMEDOUT, 62 TMF_NOT_FOUND, 63 }; 64 65 #define ISID_SIZE 6 66 67 /* Connection suspend "bit" */ 68 #define ISCSI_SUSPEND_BIT 1 69 70 #define ISCSI_ITT_MASK 0x1fff 71 #define ISCSI_TOTAL_CMDS_MAX 4096 72 /* this must be a power of two greater than ISCSI_MGMT_CMDS_MAX */ 73 #define ISCSI_TOTAL_CMDS_MIN 16 74 #define ISCSI_AGE_SHIFT 28 75 #define ISCSI_AGE_MASK 0xf 76 77 #define ISCSI_ADDRESS_BUF_LEN 64 78 79 enum { 80 /* this is the maximum possible storage for AHSs */ 81 ISCSI_MAX_AHS_SIZE = sizeof(struct iscsi_ecdb_ahdr) + 82 sizeof(struct iscsi_rlength_ahdr), 83 ISCSI_DIGEST_SIZE = sizeof(__u32), 84 }; 85 86 87 enum { 88 ISCSI_TASK_FREE, 89 ISCSI_TASK_COMPLETED, 90 ISCSI_TASK_PENDING, 91 ISCSI_TASK_RUNNING, 92 ISCSI_TASK_ABRT_TMF, /* aborted due to TMF */ 93 ISCSI_TASK_ABRT_SESS_RECOV, /* aborted due to session recovery */ 94 ISCSI_TASK_REQUEUE_SCSIQ, /* qcmd requeueing to scsi-ml */ 95 }; 96 97 struct iscsi_r2t_info { 98 __be32 ttt; /* copied from R2T */ 99 __be32 exp_statsn; /* copied from R2T */ 100 uint32_t data_length; /* copied from R2T */ 101 uint32_t data_offset; /* copied from R2T */ 102 int data_count; /* DATA-Out payload progress */ 103 int datasn; 104 /* LLDs should set/update these values */ 105 int sent; /* R2T sequence progress */ 106 }; 107 108 struct iscsi_task { 109 /* 110 * Because LLDs allocate their hdr differently, this is a pointer 111 * and length to that storage. It must be setup at session 112 * creation time. 113 */ 114 struct iscsi_hdr *hdr; 115 unsigned short hdr_max; 116 unsigned short hdr_len; /* accumulated size of hdr used */ 117 /* copied values in case we need to send tmfs */ 118 itt_t hdr_itt; 119 __be32 cmdsn; 120 struct scsi_lun lun; 121 122 int itt; /* this ITT */ 123 124 unsigned imm_count; /* imm-data (bytes) */ 125 /* offset in unsolicited stream (bytes); */ 126 struct iscsi_r2t_info unsol_r2t; 127 char *data; /* mgmt payload */ 128 unsigned data_count; 129 struct scsi_cmnd *sc; /* associated SCSI cmd*/ 130 struct iscsi_conn *conn; /* used connection */ 131 132 /* data processing tracking */ 133 unsigned long last_xfer; 134 unsigned long last_timeout; 135 bool have_checked_conn; 136 137 /* T10 protection information */ 138 bool protected; 139 140 /* state set/tested under session->lock */ 141 int state; 142 atomic_t refcount; 143 struct list_head running; /* running cmd list */ 144 void *dd_data; /* driver/transport data */ 145 }; 146 147 static inline int iscsi_task_has_unsol_data(struct iscsi_task *task) 148 { 149 return task->unsol_r2t.data_length > task->unsol_r2t.sent; 150 } 151 152 static inline void* iscsi_next_hdr(struct iscsi_task *task) 153 { 154 return (void*)task->hdr + task->hdr_len; 155 } 156 157 /* Connection's states */ 158 enum { 159 ISCSI_CONN_INITIAL_STAGE, 160 ISCSI_CONN_STARTED, 161 ISCSI_CONN_STOPPED, 162 ISCSI_CONN_CLEANUP_WAIT, 163 }; 164 165 struct iscsi_conn { 166 struct iscsi_cls_conn *cls_conn; /* ptr to class connection */ 167 void *dd_data; /* iscsi_transport data */ 168 struct iscsi_session *session; /* parent session */ 169 /* 170 * conn_stop() flag: stop to recover, stop to terminate 171 */ 172 int stop_stage; 173 struct timer_list transport_timer; 174 unsigned long last_recv; 175 unsigned long last_ping; 176 int ping_timeout; 177 int recv_timeout; 178 struct iscsi_task *ping_task; 179 180 /* iSCSI connection-wide sequencing */ 181 uint32_t exp_statsn; 182 uint32_t statsn; 183 184 /* control data */ 185 int id; /* CID */ 186 int c_stage; /* connection state */ 187 /* 188 * Preallocated buffer for pdus that have data but do not 189 * originate from scsi-ml. We never have two pdus using the 190 * buffer at the same time. It is only allocated to 191 * the default max recv size because the pdus we support 192 * should always fit in this buffer 193 */ 194 char *data; 195 struct iscsi_task *login_task; /* mtask used for login/text */ 196 struct iscsi_task *task; /* xmit task in progress */ 197 198 /* xmit */ 199 struct list_head mgmtqueue; /* mgmt (control) xmit queue */ 200 struct list_head cmdqueue; /* data-path cmd queue */ 201 struct list_head requeue; /* tasks needing another run */ 202 struct work_struct xmitwork; /* per-conn. xmit workqueue */ 203 unsigned long suspend_tx; /* suspend Tx */ 204 unsigned long suspend_rx; /* suspend Rx */ 205 206 /* abort */ 207 wait_queue_head_t ehwait; /* used in eh_abort() */ 208 struct iscsi_tm tmhdr; 209 struct timer_list tmf_timer; 210 int tmf_state; /* see TMF_INITIAL, etc.*/ 211 212 /* negotiated params */ 213 unsigned max_recv_dlength; /* initiator_max_recv_dsl*/ 214 unsigned max_xmit_dlength; /* target_max_recv_dsl */ 215 int hdrdgst_en; 216 int datadgst_en; 217 int ifmarker_en; 218 int ofmarker_en; 219 /* values userspace uses to id a conn */ 220 int persistent_port; 221 char *persistent_address; 222 223 unsigned max_segment_size; 224 unsigned tcp_xmit_wsf; 225 unsigned tcp_recv_wsf; 226 uint16_t keepalive_tmo; 227 uint16_t local_port; 228 uint8_t tcp_timestamp_stat; 229 uint8_t tcp_nagle_disable; 230 uint8_t tcp_wsf_disable; 231 uint8_t tcp_timer_scale; 232 uint8_t tcp_timestamp_en; 233 uint8_t fragment_disable; 234 uint8_t ipv4_tos; 235 uint8_t ipv6_traffic_class; 236 uint8_t ipv6_flow_label; 237 uint8_t is_fw_assigned_ipv6; 238 char *local_ipaddr; 239 240 /* MIB-statistics */ 241 uint64_t txdata_octets; 242 uint64_t rxdata_octets; 243 uint32_t scsicmd_pdus_cnt; 244 uint32_t dataout_pdus_cnt; 245 uint32_t scsirsp_pdus_cnt; 246 uint32_t datain_pdus_cnt; 247 uint32_t r2t_pdus_cnt; 248 uint32_t tmfcmd_pdus_cnt; 249 int32_t tmfrsp_pdus_cnt; 250 251 /* custom statistics */ 252 uint32_t eh_abort_cnt; 253 uint32_t fmr_unalign_cnt; 254 }; 255 256 struct iscsi_pool { 257 struct kfifo queue; /* FIFO Queue */ 258 void **pool; /* Pool of elements */ 259 int max; /* Max number of elements */ 260 }; 261 262 /* Session's states */ 263 enum { 264 ISCSI_STATE_FREE = 1, 265 ISCSI_STATE_LOGGED_IN, 266 ISCSI_STATE_FAILED, 267 ISCSI_STATE_TERMINATE, 268 ISCSI_STATE_IN_RECOVERY, 269 ISCSI_STATE_RECOVERY_FAILED, 270 ISCSI_STATE_LOGGING_OUT, 271 }; 272 273 struct iscsi_session { 274 struct iscsi_cls_session *cls_session; 275 /* 276 * Syncs up the scsi eh thread with the iscsi eh thread when sending 277 * task management functions. This must be taken before the session 278 * and recv lock. 279 */ 280 struct mutex eh_mutex; 281 282 /* iSCSI session-wide sequencing */ 283 uint32_t cmdsn; 284 uint32_t exp_cmdsn; 285 uint32_t max_cmdsn; 286 287 /* This tracks the reqs queued into the initiator */ 288 uint32_t queued_cmdsn; 289 290 /* configuration */ 291 int abort_timeout; 292 int lu_reset_timeout; 293 int tgt_reset_timeout; 294 int initial_r2t_en; 295 unsigned short max_r2t; 296 int imm_data_en; 297 unsigned first_burst; 298 unsigned max_burst; 299 int time2wait; 300 int time2retain; 301 int pdu_inorder_en; 302 int dataseq_inorder_en; 303 int erl; 304 int fast_abort; 305 int tpgt; 306 char *username; 307 char *username_in; 308 char *password; 309 char *password_in; 310 char *targetname; 311 char *targetalias; 312 char *ifacename; 313 char *initiatorname; 314 char *boot_root; 315 char *boot_nic; 316 char *boot_target; 317 char *portal_type; 318 char *discovery_parent_type; 319 uint16_t discovery_parent_idx; 320 uint16_t def_taskmgmt_tmo; 321 uint16_t tsid; 322 uint8_t auto_snd_tgt_disable; 323 uint8_t discovery_sess; 324 uint8_t chap_auth_en; 325 uint8_t discovery_logout_en; 326 uint8_t bidi_chap_en; 327 uint8_t discovery_auth_optional; 328 uint8_t isid[ISID_SIZE]; 329 330 /* control data */ 331 struct iscsi_transport *tt; 332 struct Scsi_Host *host; 333 struct iscsi_conn *leadconn; /* leading connection */ 334 /* Between the forward and the backward locks exists a strict locking 335 * hierarchy. The mutual exclusion zone protected by the forward lock 336 * can enclose the mutual exclusion zone protected by the backward lock 337 * but not vice versa. 338 */ 339 spinlock_t frwd_lock; /* protects session state, * 340 * cmdsn, queued_cmdsn * 341 * session resources: * 342 * - cmdpool kfifo_out , * 343 * - mgmtpool, */ 344 spinlock_t back_lock; /* protects cmdsn_exp * 345 * cmdsn_max, * 346 * cmdpool kfifo_in */ 347 int state; /* session state */ 348 int age; /* counts session re-opens */ 349 350 int scsi_cmds_max; /* max scsi commands */ 351 int cmds_max; /* size of cmds array */ 352 struct iscsi_task **cmds; /* Original Cmds arr */ 353 struct iscsi_pool cmdpool; /* PDU's pool */ 354 void *dd_data; /* LLD private data */ 355 }; 356 357 enum { 358 ISCSI_HOST_SETUP, 359 ISCSI_HOST_REMOVED, 360 }; 361 362 struct iscsi_host { 363 char *initiatorname; 364 /* hw address or netdev iscsi connection is bound to */ 365 char *hwaddress; 366 char *netdev; 367 368 wait_queue_head_t session_removal_wq; 369 /* protects sessions and state */ 370 spinlock_t lock; 371 int num_sessions; 372 int state; 373 374 struct workqueue_struct *workq; 375 char workq_name[20]; 376 }; 377 378 /* 379 * scsi host template 380 */ 381 extern int iscsi_change_queue_depth(struct scsi_device *sdev, int depth, 382 int reason); 383 extern int iscsi_eh_abort(struct scsi_cmnd *sc); 384 extern int iscsi_eh_recover_target(struct scsi_cmnd *sc); 385 extern int iscsi_eh_session_reset(struct scsi_cmnd *sc); 386 extern int iscsi_eh_device_reset(struct scsi_cmnd *sc); 387 extern int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc); 388 389 /* 390 * iSCSI host helpers. 391 */ 392 #define iscsi_host_priv(_shost) \ 393 (shost_priv(_shost) + sizeof(struct iscsi_host)) 394 395 extern int iscsi_host_set_param(struct Scsi_Host *shost, 396 enum iscsi_host_param param, char *buf, 397 int buflen); 398 extern int iscsi_host_get_param(struct Scsi_Host *shost, 399 enum iscsi_host_param param, char *buf); 400 extern int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev); 401 extern struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht, 402 int dd_data_size, 403 bool xmit_can_sleep); 404 extern void iscsi_host_remove(struct Scsi_Host *shost); 405 extern void iscsi_host_free(struct Scsi_Host *shost); 406 extern int iscsi_target_alloc(struct scsi_target *starget); 407 408 /* 409 * session management 410 */ 411 extern struct iscsi_cls_session * 412 iscsi_session_setup(struct iscsi_transport *, struct Scsi_Host *shost, 413 uint16_t, int, int, uint32_t, unsigned int); 414 extern void iscsi_session_teardown(struct iscsi_cls_session *); 415 extern void iscsi_session_recovery_timedout(struct iscsi_cls_session *); 416 extern int iscsi_set_param(struct iscsi_cls_conn *cls_conn, 417 enum iscsi_param param, char *buf, int buflen); 418 extern int iscsi_session_get_param(struct iscsi_cls_session *cls_session, 419 enum iscsi_param param, char *buf); 420 421 #define iscsi_session_printk(prefix, _sess, fmt, a...) \ 422 iscsi_cls_session_printk(prefix, _sess->cls_session, fmt, ##a) 423 424 /* 425 * connection management 426 */ 427 extern struct iscsi_cls_conn *iscsi_conn_setup(struct iscsi_cls_session *, 428 int, uint32_t); 429 extern void iscsi_conn_teardown(struct iscsi_cls_conn *); 430 extern int iscsi_conn_start(struct iscsi_cls_conn *); 431 extern void iscsi_conn_stop(struct iscsi_cls_conn *, int); 432 extern int iscsi_conn_bind(struct iscsi_cls_session *, struct iscsi_cls_conn *, 433 int); 434 extern void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err); 435 extern void iscsi_session_failure(struct iscsi_session *session, 436 enum iscsi_err err); 437 extern int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, 438 enum iscsi_param param, char *buf); 439 extern int iscsi_conn_get_addr_param(struct sockaddr_storage *addr, 440 enum iscsi_param param, char *buf); 441 extern void iscsi_suspend_tx(struct iscsi_conn *conn); 442 extern void iscsi_suspend_queue(struct iscsi_conn *conn); 443 extern void iscsi_conn_queue_work(struct iscsi_conn *conn); 444 445 #define iscsi_conn_printk(prefix, _c, fmt, a...) \ 446 iscsi_cls_conn_printk(prefix, ((struct iscsi_conn *)_c)->cls_conn, \ 447 fmt, ##a) 448 449 /* 450 * pdu and task processing 451 */ 452 extern void iscsi_update_cmdsn(struct iscsi_session *, struct iscsi_nopin *); 453 extern void iscsi_prep_data_out_pdu(struct iscsi_task *task, 454 struct iscsi_r2t_info *r2t, 455 struct iscsi_data *hdr); 456 extern int iscsi_conn_send_pdu(struct iscsi_cls_conn *, struct iscsi_hdr *, 457 char *, uint32_t); 458 extern int iscsi_complete_pdu(struct iscsi_conn *, struct iscsi_hdr *, 459 char *, int); 460 extern int __iscsi_complete_pdu(struct iscsi_conn *, struct iscsi_hdr *, 461 char *, int); 462 extern int iscsi_verify_itt(struct iscsi_conn *, itt_t); 463 extern struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *, itt_t); 464 extern struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *, itt_t); 465 extern void iscsi_requeue_task(struct iscsi_task *task); 466 extern void iscsi_put_task(struct iscsi_task *task); 467 extern void __iscsi_put_task(struct iscsi_task *task); 468 extern void __iscsi_get_task(struct iscsi_task *task); 469 extern void iscsi_complete_scsi_task(struct iscsi_task *task, 470 uint32_t exp_cmdsn, uint32_t max_cmdsn); 471 472 /* 473 * generic helpers 474 */ 475 extern void iscsi_pool_free(struct iscsi_pool *); 476 extern int iscsi_pool_init(struct iscsi_pool *, int, void ***, int); 477 extern int iscsi_switch_str_param(char **, char *); 478 479 /* 480 * inline functions to deal with padding. 481 */ 482 static inline unsigned int 483 iscsi_padded(unsigned int len) 484 { 485 return (len + ISCSI_PAD_LEN - 1) & ~(ISCSI_PAD_LEN - 1); 486 } 487 488 static inline unsigned int 489 iscsi_padding(unsigned int len) 490 { 491 len &= (ISCSI_PAD_LEN - 1); 492 if (len) 493 len = ISCSI_PAD_LEN - len; 494 return len; 495 } 496 497 #endif 498