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 /* Connection suspend "bit" */ 66 #define ISCSI_SUSPEND_BIT 1 67 68 #define ISCSI_ITT_MASK 0x1fff 69 #define ISCSI_TOTAL_CMDS_MAX 4096 70 /* this must be a power of two greater than ISCSI_MGMT_CMDS_MAX */ 71 #define ISCSI_TOTAL_CMDS_MIN 16 72 #define ISCSI_AGE_SHIFT 28 73 #define ISCSI_AGE_MASK 0xf 74 75 #define ISCSI_ADDRESS_BUF_LEN 64 76 77 enum { 78 /* this is the maximum possible storage for AHSs */ 79 ISCSI_MAX_AHS_SIZE = sizeof(struct iscsi_ecdb_ahdr) + 80 sizeof(struct iscsi_rlength_ahdr), 81 ISCSI_DIGEST_SIZE = sizeof(__u32), 82 }; 83 84 85 enum { 86 ISCSI_TASK_FREE, 87 ISCSI_TASK_COMPLETED, 88 ISCSI_TASK_PENDING, 89 ISCSI_TASK_RUNNING, 90 ISCSI_TASK_ABRT_TMF, /* aborted due to TMF */ 91 ISCSI_TASK_ABRT_SESS_RECOV, /* aborted due to session recovery */ 92 ISCSI_TASK_REQUEUE_SCSIQ, /* qcmd requeueing to scsi-ml */ 93 }; 94 95 struct iscsi_r2t_info { 96 __be32 ttt; /* copied from R2T */ 97 __be32 exp_statsn; /* copied from R2T */ 98 uint32_t data_length; /* copied from R2T */ 99 uint32_t data_offset; /* copied from R2T */ 100 int data_count; /* DATA-Out payload progress */ 101 int datasn; 102 /* LLDs should set/update these values */ 103 int sent; /* R2T sequence progress */ 104 }; 105 106 struct iscsi_task { 107 /* 108 * Because LLDs allocate their hdr differently, this is a pointer 109 * and length to that storage. It must be setup at session 110 * creation time. 111 */ 112 struct iscsi_hdr *hdr; 113 unsigned short hdr_max; 114 unsigned short hdr_len; /* accumulated size of hdr used */ 115 /* copied values in case we need to send tmfs */ 116 itt_t hdr_itt; 117 __be32 cmdsn; 118 struct scsi_lun lun; 119 120 int itt; /* this ITT */ 121 122 unsigned imm_count; /* imm-data (bytes) */ 123 /* offset in unsolicited stream (bytes); */ 124 struct iscsi_r2t_info unsol_r2t; 125 char *data; /* mgmt payload */ 126 unsigned data_count; 127 struct scsi_cmnd *sc; /* associated SCSI cmd*/ 128 struct iscsi_conn *conn; /* used connection */ 129 130 /* data processing tracking */ 131 unsigned long last_xfer; 132 unsigned long last_timeout; 133 bool have_checked_conn; 134 /* state set/tested under session->lock */ 135 int state; 136 atomic_t refcount; 137 struct list_head running; /* running cmd list */ 138 void *dd_data; /* driver/transport data */ 139 }; 140 141 static inline int iscsi_task_has_unsol_data(struct iscsi_task *task) 142 { 143 return task->unsol_r2t.data_length > task->unsol_r2t.sent; 144 } 145 146 static inline void* iscsi_next_hdr(struct iscsi_task *task) 147 { 148 return (void*)task->hdr + task->hdr_len; 149 } 150 151 /* Connection's states */ 152 enum { 153 ISCSI_CONN_INITIAL_STAGE, 154 ISCSI_CONN_STARTED, 155 ISCSI_CONN_STOPPED, 156 ISCSI_CONN_CLEANUP_WAIT, 157 }; 158 159 struct iscsi_conn { 160 struct iscsi_cls_conn *cls_conn; /* ptr to class connection */ 161 void *dd_data; /* iscsi_transport data */ 162 struct iscsi_session *session; /* parent session */ 163 /* 164 * conn_stop() flag: stop to recover, stop to terminate 165 */ 166 int stop_stage; 167 struct timer_list transport_timer; 168 unsigned long last_recv; 169 unsigned long last_ping; 170 int ping_timeout; 171 int recv_timeout; 172 struct iscsi_task *ping_task; 173 174 /* iSCSI connection-wide sequencing */ 175 uint32_t exp_statsn; 176 177 /* control data */ 178 int id; /* CID */ 179 int c_stage; /* connection state */ 180 /* 181 * Preallocated buffer for pdus that have data but do not 182 * originate from scsi-ml. We never have two pdus using the 183 * buffer at the same time. It is only allocated to 184 * the default max recv size because the pdus we support 185 * should always fit in this buffer 186 */ 187 char *data; 188 struct iscsi_task *login_task; /* mtask used for login/text */ 189 struct iscsi_task *task; /* xmit task in progress */ 190 191 /* xmit */ 192 struct list_head mgmtqueue; /* mgmt (control) xmit queue */ 193 struct list_head cmdqueue; /* data-path cmd queue */ 194 struct list_head requeue; /* tasks needing another run */ 195 struct work_struct xmitwork; /* per-conn. xmit workqueue */ 196 unsigned long suspend_tx; /* suspend Tx */ 197 unsigned long suspend_rx; /* suspend Rx */ 198 199 /* abort */ 200 wait_queue_head_t ehwait; /* used in eh_abort() */ 201 struct iscsi_tm tmhdr; 202 struct timer_list tmf_timer; 203 int tmf_state; /* see TMF_INITIAL, etc.*/ 204 205 /* negotiated params */ 206 unsigned max_recv_dlength; /* initiator_max_recv_dsl*/ 207 unsigned max_xmit_dlength; /* target_max_recv_dsl */ 208 int hdrdgst_en; 209 int datadgst_en; 210 int ifmarker_en; 211 int ofmarker_en; 212 /* values userspace uses to id a conn */ 213 int persistent_port; 214 char *persistent_address; 215 216 /* MIB-statistics */ 217 uint64_t txdata_octets; 218 uint64_t rxdata_octets; 219 uint32_t scsicmd_pdus_cnt; 220 uint32_t dataout_pdus_cnt; 221 uint32_t scsirsp_pdus_cnt; 222 uint32_t datain_pdus_cnt; 223 uint32_t r2t_pdus_cnt; 224 uint32_t tmfcmd_pdus_cnt; 225 int32_t tmfrsp_pdus_cnt; 226 227 /* custom statistics */ 228 uint32_t eh_abort_cnt; 229 uint32_t fmr_unalign_cnt; 230 }; 231 232 struct iscsi_pool { 233 struct kfifo queue; /* FIFO Queue */ 234 void **pool; /* Pool of elements */ 235 int max; /* Max number of elements */ 236 }; 237 238 /* Session's states */ 239 enum { 240 ISCSI_STATE_FREE = 1, 241 ISCSI_STATE_LOGGED_IN, 242 ISCSI_STATE_FAILED, 243 ISCSI_STATE_TERMINATE, 244 ISCSI_STATE_IN_RECOVERY, 245 ISCSI_STATE_RECOVERY_FAILED, 246 ISCSI_STATE_LOGGING_OUT, 247 }; 248 249 struct iscsi_session { 250 struct iscsi_cls_session *cls_session; 251 /* 252 * Syncs up the scsi eh thread with the iscsi eh thread when sending 253 * task management functions. This must be taken before the session 254 * and recv lock. 255 */ 256 struct mutex eh_mutex; 257 258 /* iSCSI session-wide sequencing */ 259 uint32_t cmdsn; 260 uint32_t exp_cmdsn; 261 uint32_t max_cmdsn; 262 263 /* This tracks the reqs queued into the initiator */ 264 uint32_t queued_cmdsn; 265 266 /* configuration */ 267 int abort_timeout; 268 int lu_reset_timeout; 269 int tgt_reset_timeout; 270 int initial_r2t_en; 271 unsigned short max_r2t; 272 int imm_data_en; 273 unsigned first_burst; 274 unsigned max_burst; 275 int time2wait; 276 int time2retain; 277 int pdu_inorder_en; 278 int dataseq_inorder_en; 279 int erl; 280 int fast_abort; 281 int tpgt; 282 char *username; 283 char *username_in; 284 char *password; 285 char *password_in; 286 char *targetname; 287 char *targetalias; 288 char *ifacename; 289 char *initiatorname; 290 /* control data */ 291 struct iscsi_transport *tt; 292 struct Scsi_Host *host; 293 struct iscsi_conn *leadconn; /* leading connection */ 294 spinlock_t lock; /* protects session state, * 295 * sequence numbers, * 296 * session resources: * 297 * - cmdpool, * 298 * - mgmtpool, * 299 * - r2tpool */ 300 int state; /* session state */ 301 int age; /* counts session re-opens */ 302 303 int scsi_cmds_max; /* max scsi commands */ 304 int cmds_max; /* size of cmds array */ 305 struct iscsi_task **cmds; /* Original Cmds arr */ 306 struct iscsi_pool cmdpool; /* PDU's pool */ 307 void *dd_data; /* LLD private data */ 308 }; 309 310 enum { 311 ISCSI_HOST_SETUP, 312 ISCSI_HOST_REMOVED, 313 }; 314 315 struct iscsi_host { 316 char *initiatorname; 317 /* hw address or netdev iscsi connection is bound to */ 318 char *hwaddress; 319 char *netdev; 320 321 wait_queue_head_t session_removal_wq; 322 /* protects sessions and state */ 323 spinlock_t lock; 324 int num_sessions; 325 int state; 326 327 struct workqueue_struct *workq; 328 char workq_name[20]; 329 }; 330 331 /* 332 * scsi host template 333 */ 334 extern int iscsi_change_queue_depth(struct scsi_device *sdev, int depth, 335 int reason); 336 extern int iscsi_eh_abort(struct scsi_cmnd *sc); 337 extern int iscsi_eh_recover_target(struct scsi_cmnd *sc); 338 extern int iscsi_eh_session_reset(struct scsi_cmnd *sc); 339 extern int iscsi_eh_device_reset(struct scsi_cmnd *sc); 340 extern int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc); 341 342 /* 343 * iSCSI host helpers. 344 */ 345 #define iscsi_host_priv(_shost) \ 346 (shost_priv(_shost) + sizeof(struct iscsi_host)) 347 348 extern int iscsi_host_set_param(struct Scsi_Host *shost, 349 enum iscsi_host_param param, char *buf, 350 int buflen); 351 extern int iscsi_host_get_param(struct Scsi_Host *shost, 352 enum iscsi_host_param param, char *buf); 353 extern int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev); 354 extern struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht, 355 int dd_data_size, 356 bool xmit_can_sleep); 357 extern void iscsi_host_remove(struct Scsi_Host *shost); 358 extern void iscsi_host_free(struct Scsi_Host *shost); 359 extern int iscsi_target_alloc(struct scsi_target *starget); 360 361 /* 362 * session management 363 */ 364 extern struct iscsi_cls_session * 365 iscsi_session_setup(struct iscsi_transport *, struct Scsi_Host *shost, 366 uint16_t, int, int, uint32_t, unsigned int); 367 extern void iscsi_session_teardown(struct iscsi_cls_session *); 368 extern void iscsi_session_recovery_timedout(struct iscsi_cls_session *); 369 extern int iscsi_set_param(struct iscsi_cls_conn *cls_conn, 370 enum iscsi_param param, char *buf, int buflen); 371 extern int iscsi_session_get_param(struct iscsi_cls_session *cls_session, 372 enum iscsi_param param, char *buf); 373 374 #define iscsi_session_printk(prefix, _sess, fmt, a...) \ 375 iscsi_cls_session_printk(prefix, _sess->cls_session, fmt, ##a) 376 377 /* 378 * connection management 379 */ 380 extern struct iscsi_cls_conn *iscsi_conn_setup(struct iscsi_cls_session *, 381 int, uint32_t); 382 extern void iscsi_conn_teardown(struct iscsi_cls_conn *); 383 extern int iscsi_conn_start(struct iscsi_cls_conn *); 384 extern void iscsi_conn_stop(struct iscsi_cls_conn *, int); 385 extern int iscsi_conn_bind(struct iscsi_cls_session *, struct iscsi_cls_conn *, 386 int); 387 extern void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err); 388 extern void iscsi_session_failure(struct iscsi_session *session, 389 enum iscsi_err err); 390 extern int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, 391 enum iscsi_param param, char *buf); 392 extern int iscsi_conn_get_addr_param(struct sockaddr_storage *addr, 393 enum iscsi_param param, char *buf); 394 extern void iscsi_suspend_tx(struct iscsi_conn *conn); 395 extern void iscsi_suspend_queue(struct iscsi_conn *conn); 396 extern void iscsi_conn_queue_work(struct iscsi_conn *conn); 397 398 #define iscsi_conn_printk(prefix, _c, fmt, a...) \ 399 iscsi_cls_conn_printk(prefix, ((struct iscsi_conn *)_c)->cls_conn, \ 400 fmt, ##a) 401 402 /* 403 * pdu and task processing 404 */ 405 extern void iscsi_update_cmdsn(struct iscsi_session *, struct iscsi_nopin *); 406 extern void iscsi_prep_data_out_pdu(struct iscsi_task *task, 407 struct iscsi_r2t_info *r2t, 408 struct iscsi_data *hdr); 409 extern int iscsi_conn_send_pdu(struct iscsi_cls_conn *, struct iscsi_hdr *, 410 char *, uint32_t); 411 extern int iscsi_complete_pdu(struct iscsi_conn *, struct iscsi_hdr *, 412 char *, int); 413 extern int __iscsi_complete_pdu(struct iscsi_conn *, struct iscsi_hdr *, 414 char *, int); 415 extern int iscsi_verify_itt(struct iscsi_conn *, itt_t); 416 extern struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *, itt_t); 417 extern struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *, itt_t); 418 extern void iscsi_requeue_task(struct iscsi_task *task); 419 extern void iscsi_put_task(struct iscsi_task *task); 420 extern void __iscsi_put_task(struct iscsi_task *task); 421 extern void __iscsi_get_task(struct iscsi_task *task); 422 extern void iscsi_complete_scsi_task(struct iscsi_task *task, 423 uint32_t exp_cmdsn, uint32_t max_cmdsn); 424 425 /* 426 * generic helpers 427 */ 428 extern void iscsi_pool_free(struct iscsi_pool *); 429 extern int iscsi_pool_init(struct iscsi_pool *, int, void ***, int); 430 431 /* 432 * inline functions to deal with padding. 433 */ 434 static inline unsigned int 435 iscsi_padded(unsigned int len) 436 { 437 return (len + ISCSI_PAD_LEN - 1) & ~(ISCSI_PAD_LEN - 1); 438 } 439 440 static inline unsigned int 441 iscsi_padding(unsigned int len) 442 { 443 len &= (ISCSI_PAD_LEN - 1); 444 if (len) 445 len = ISCSI_PAD_LEN - len; 446 return len; 447 } 448 449 #endif 450