1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * iSCSI lib functions 4 * 5 * Copyright (C) 2006 Red Hat, Inc. All rights reserved. 6 * Copyright (C) 2004 - 2006 Mike Christie 7 * Copyright (C) 2004 - 2005 Dmitry Yusupov 8 * Copyright (C) 2004 - 2005 Alex Aizman 9 * maintained by open-iscsi@googlegroups.com 10 */ 11 #include <linux/types.h> 12 #include <linux/kfifo.h> 13 #include <linux/delay.h> 14 #include <linux/log2.h> 15 #include <linux/slab.h> 16 #include <linux/sched/signal.h> 17 #include <linux/module.h> 18 #include <asm/unaligned.h> 19 #include <net/tcp.h> 20 #include <scsi/scsi_cmnd.h> 21 #include <scsi/scsi_device.h> 22 #include <scsi/scsi_eh.h> 23 #include <scsi/scsi_tcq.h> 24 #include <scsi/scsi_host.h> 25 #include <scsi/scsi.h> 26 #include <scsi/iscsi_proto.h> 27 #include <scsi/scsi_transport.h> 28 #include <scsi/scsi_transport_iscsi.h> 29 #include <scsi/libiscsi.h> 30 #include <trace/events/iscsi.h> 31 32 static int iscsi_dbg_lib_conn; 33 module_param_named(debug_libiscsi_conn, iscsi_dbg_lib_conn, int, 34 S_IRUGO | S_IWUSR); 35 MODULE_PARM_DESC(debug_libiscsi_conn, 36 "Turn on debugging for connections in libiscsi module. " 37 "Set to 1 to turn on, and zero to turn off. Default is off."); 38 39 static int iscsi_dbg_lib_session; 40 module_param_named(debug_libiscsi_session, iscsi_dbg_lib_session, int, 41 S_IRUGO | S_IWUSR); 42 MODULE_PARM_DESC(debug_libiscsi_session, 43 "Turn on debugging for sessions in libiscsi module. " 44 "Set to 1 to turn on, and zero to turn off. Default is off."); 45 46 static int iscsi_dbg_lib_eh; 47 module_param_named(debug_libiscsi_eh, iscsi_dbg_lib_eh, int, 48 S_IRUGO | S_IWUSR); 49 MODULE_PARM_DESC(debug_libiscsi_eh, 50 "Turn on debugging for error handling in libiscsi module. " 51 "Set to 1 to turn on, and zero to turn off. Default is off."); 52 53 #define ISCSI_DBG_CONN(_conn, dbg_fmt, arg...) \ 54 do { \ 55 if (iscsi_dbg_lib_conn) \ 56 iscsi_conn_printk(KERN_INFO, _conn, \ 57 "%s " dbg_fmt, \ 58 __func__, ##arg); \ 59 iscsi_dbg_trace(trace_iscsi_dbg_conn, \ 60 &(_conn)->cls_conn->dev, \ 61 "%s " dbg_fmt, __func__, ##arg);\ 62 } while (0); 63 64 #define ISCSI_DBG_SESSION(_session, dbg_fmt, arg...) \ 65 do { \ 66 if (iscsi_dbg_lib_session) \ 67 iscsi_session_printk(KERN_INFO, _session, \ 68 "%s " dbg_fmt, \ 69 __func__, ##arg); \ 70 iscsi_dbg_trace(trace_iscsi_dbg_session, \ 71 &(_session)->cls_session->dev, \ 72 "%s " dbg_fmt, __func__, ##arg); \ 73 } while (0); 74 75 #define ISCSI_DBG_EH(_session, dbg_fmt, arg...) \ 76 do { \ 77 if (iscsi_dbg_lib_eh) \ 78 iscsi_session_printk(KERN_INFO, _session, \ 79 "%s " dbg_fmt, \ 80 __func__, ##arg); \ 81 iscsi_dbg_trace(trace_iscsi_dbg_eh, \ 82 &(_session)->cls_session->dev, \ 83 "%s " dbg_fmt, __func__, ##arg); \ 84 } while (0); 85 86 inline void iscsi_conn_queue_work(struct iscsi_conn *conn) 87 { 88 struct Scsi_Host *shost = conn->session->host; 89 struct iscsi_host *ihost = shost_priv(shost); 90 91 if (ihost->workq) 92 queue_work(ihost->workq, &conn->xmitwork); 93 } 94 EXPORT_SYMBOL_GPL(iscsi_conn_queue_work); 95 96 static void __iscsi_update_cmdsn(struct iscsi_session *session, 97 uint32_t exp_cmdsn, uint32_t max_cmdsn) 98 { 99 /* 100 * standard specifies this check for when to update expected and 101 * max sequence numbers 102 */ 103 if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1)) 104 return; 105 106 if (exp_cmdsn != session->exp_cmdsn && 107 !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn)) 108 session->exp_cmdsn = exp_cmdsn; 109 110 if (max_cmdsn != session->max_cmdsn && 111 !iscsi_sna_lt(max_cmdsn, session->max_cmdsn)) 112 session->max_cmdsn = max_cmdsn; 113 } 114 115 void iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr) 116 { 117 __iscsi_update_cmdsn(session, be32_to_cpu(hdr->exp_cmdsn), 118 be32_to_cpu(hdr->max_cmdsn)); 119 } 120 EXPORT_SYMBOL_GPL(iscsi_update_cmdsn); 121 122 /** 123 * iscsi_prep_data_out_pdu - initialize Data-Out 124 * @task: scsi command task 125 * @r2t: R2T info 126 * @hdr: iscsi data in pdu 127 * 128 * Notes: 129 * Initialize Data-Out within this R2T sequence and finds 130 * proper data_offset within this SCSI command. 131 * 132 * This function is called with connection lock taken. 133 **/ 134 void iscsi_prep_data_out_pdu(struct iscsi_task *task, struct iscsi_r2t_info *r2t, 135 struct iscsi_data *hdr) 136 { 137 struct iscsi_conn *conn = task->conn; 138 unsigned int left = r2t->data_length - r2t->sent; 139 140 task->hdr_len = sizeof(struct iscsi_data); 141 142 memset(hdr, 0, sizeof(struct iscsi_data)); 143 hdr->ttt = r2t->ttt; 144 hdr->datasn = cpu_to_be32(r2t->datasn); 145 r2t->datasn++; 146 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; 147 hdr->lun = task->lun; 148 hdr->itt = task->hdr_itt; 149 hdr->exp_statsn = r2t->exp_statsn; 150 hdr->offset = cpu_to_be32(r2t->data_offset + r2t->sent); 151 if (left > conn->max_xmit_dlength) { 152 hton24(hdr->dlength, conn->max_xmit_dlength); 153 r2t->data_count = conn->max_xmit_dlength; 154 hdr->flags = 0; 155 } else { 156 hton24(hdr->dlength, left); 157 r2t->data_count = left; 158 hdr->flags = ISCSI_FLAG_CMD_FINAL; 159 } 160 conn->dataout_pdus_cnt++; 161 } 162 EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu); 163 164 static int iscsi_add_hdr(struct iscsi_task *task, unsigned len) 165 { 166 unsigned exp_len = task->hdr_len + len; 167 168 if (exp_len > task->hdr_max) { 169 WARN_ON(1); 170 return -EINVAL; 171 } 172 173 WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */ 174 task->hdr_len = exp_len; 175 return 0; 176 } 177 178 /* 179 * make an extended cdb AHS 180 */ 181 static int iscsi_prep_ecdb_ahs(struct iscsi_task *task) 182 { 183 struct scsi_cmnd *cmd = task->sc; 184 unsigned rlen, pad_len; 185 unsigned short ahslength; 186 struct iscsi_ecdb_ahdr *ecdb_ahdr; 187 int rc; 188 189 ecdb_ahdr = iscsi_next_hdr(task); 190 rlen = cmd->cmd_len - ISCSI_CDB_SIZE; 191 192 BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb)); 193 ahslength = rlen + sizeof(ecdb_ahdr->reserved); 194 195 pad_len = iscsi_padding(rlen); 196 197 rc = iscsi_add_hdr(task, sizeof(ecdb_ahdr->ahslength) + 198 sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len); 199 if (rc) 200 return rc; 201 202 if (pad_len) 203 memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len); 204 205 ecdb_ahdr->ahslength = cpu_to_be16(ahslength); 206 ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB; 207 ecdb_ahdr->reserved = 0; 208 memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen); 209 210 ISCSI_DBG_SESSION(task->conn->session, 211 "iscsi_prep_ecdb_ahs: varlen_cdb_len %d " 212 "rlen %d pad_len %d ahs_length %d iscsi_headers_size " 213 "%u\n", cmd->cmd_len, rlen, pad_len, ahslength, 214 task->hdr_len); 215 return 0; 216 } 217 218 /** 219 * iscsi_check_tmf_restrictions - check if a task is affected by TMF 220 * @task: iscsi task 221 * @opcode: opcode to check for 222 * 223 * During TMF a task has to be checked if it's affected. 224 * All unrelated I/O can be passed through, but I/O to the 225 * affected LUN should be restricted. 226 * If 'fast_abort' is set we won't be sending any I/O to the 227 * affected LUN. 228 * Otherwise the target is waiting for all TTTs to be completed, 229 * so we have to send all outstanding Data-Out PDUs to the target. 230 */ 231 static int iscsi_check_tmf_restrictions(struct iscsi_task *task, int opcode) 232 { 233 struct iscsi_conn *conn = task->conn; 234 struct iscsi_tm *tmf = &conn->tmhdr; 235 u64 hdr_lun; 236 237 if (conn->tmf_state == TMF_INITIAL) 238 return 0; 239 240 if ((tmf->opcode & ISCSI_OPCODE_MASK) != ISCSI_OP_SCSI_TMFUNC) 241 return 0; 242 243 switch (ISCSI_TM_FUNC_VALUE(tmf)) { 244 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 245 /* 246 * Allow PDUs for unrelated LUNs 247 */ 248 hdr_lun = scsilun_to_int(&tmf->lun); 249 if (hdr_lun != task->sc->device->lun) 250 return 0; 251 fallthrough; 252 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 253 /* 254 * Fail all SCSI cmd PDUs 255 */ 256 if (opcode != ISCSI_OP_SCSI_DATA_OUT) { 257 iscsi_conn_printk(KERN_INFO, conn, 258 "task [op %x itt " 259 "0x%x/0x%x] " 260 "rejected.\n", 261 opcode, task->itt, 262 task->hdr_itt); 263 return -EACCES; 264 } 265 /* 266 * And also all data-out PDUs in response to R2T 267 * if fast_abort is set. 268 */ 269 if (conn->session->fast_abort) { 270 iscsi_conn_printk(KERN_INFO, conn, 271 "task [op %x itt " 272 "0x%x/0x%x] fast abort.\n", 273 opcode, task->itt, 274 task->hdr_itt); 275 return -EACCES; 276 } 277 break; 278 case ISCSI_TM_FUNC_ABORT_TASK: 279 /* 280 * the caller has already checked if the task 281 * they want to abort was in the pending queue so if 282 * we are here the cmd pdu has gone out already, and 283 * we will only hit this for data-outs 284 */ 285 if (opcode == ISCSI_OP_SCSI_DATA_OUT && 286 task->hdr_itt == tmf->rtt) { 287 ISCSI_DBG_SESSION(conn->session, 288 "Preventing task %x/%x from sending " 289 "data-out due to abort task in " 290 "progress\n", task->itt, 291 task->hdr_itt); 292 return -EACCES; 293 } 294 break; 295 } 296 297 return 0; 298 } 299 300 /** 301 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu 302 * @task: iscsi task 303 * 304 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set 305 * fields like dlength or final based on how much data it sends 306 */ 307 static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task) 308 { 309 struct iscsi_conn *conn = task->conn; 310 struct iscsi_session *session = conn->session; 311 struct scsi_cmnd *sc = task->sc; 312 struct iscsi_scsi_req *hdr; 313 unsigned hdrlength, cmd_len, transfer_length; 314 itt_t itt; 315 int rc; 316 317 rc = iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_CMD); 318 if (rc) 319 return rc; 320 321 if (conn->session->tt->alloc_pdu) { 322 rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_CMD); 323 if (rc) 324 return rc; 325 } 326 hdr = (struct iscsi_scsi_req *)task->hdr; 327 itt = hdr->itt; 328 memset(hdr, 0, sizeof(*hdr)); 329 330 if (session->tt->parse_pdu_itt) 331 hdr->itt = task->hdr_itt = itt; 332 else 333 hdr->itt = task->hdr_itt = build_itt(task->itt, 334 task->conn->session->age); 335 task->hdr_len = 0; 336 rc = iscsi_add_hdr(task, sizeof(*hdr)); 337 if (rc) 338 return rc; 339 hdr->opcode = ISCSI_OP_SCSI_CMD; 340 hdr->flags = ISCSI_ATTR_SIMPLE; 341 int_to_scsilun(sc->device->lun, &hdr->lun); 342 task->lun = hdr->lun; 343 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); 344 cmd_len = sc->cmd_len; 345 if (cmd_len < ISCSI_CDB_SIZE) 346 memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len); 347 else if (cmd_len > ISCSI_CDB_SIZE) { 348 rc = iscsi_prep_ecdb_ahs(task); 349 if (rc) 350 return rc; 351 cmd_len = ISCSI_CDB_SIZE; 352 } 353 memcpy(hdr->cdb, sc->cmnd, cmd_len); 354 355 task->imm_count = 0; 356 if (scsi_get_prot_op(sc) != SCSI_PROT_NORMAL) 357 task->protected = true; 358 359 transfer_length = scsi_transfer_length(sc); 360 hdr->data_length = cpu_to_be32(transfer_length); 361 if (sc->sc_data_direction == DMA_TO_DEVICE) { 362 struct iscsi_r2t_info *r2t = &task->unsol_r2t; 363 364 hdr->flags |= ISCSI_FLAG_CMD_WRITE; 365 /* 366 * Write counters: 367 * 368 * imm_count bytes to be sent right after 369 * SCSI PDU Header 370 * 371 * unsol_count bytes(as Data-Out) to be sent 372 * without R2T ack right after 373 * immediate data 374 * 375 * r2t data_length bytes to be sent via R2T ack's 376 * 377 * pad_count bytes to be sent as zero-padding 378 */ 379 memset(r2t, 0, sizeof(*r2t)); 380 381 if (session->imm_data_en) { 382 if (transfer_length >= session->first_burst) 383 task->imm_count = min(session->first_burst, 384 conn->max_xmit_dlength); 385 else 386 task->imm_count = min(transfer_length, 387 conn->max_xmit_dlength); 388 hton24(hdr->dlength, task->imm_count); 389 } else 390 zero_data(hdr->dlength); 391 392 if (!session->initial_r2t_en) { 393 r2t->data_length = min(session->first_burst, 394 transfer_length) - 395 task->imm_count; 396 r2t->data_offset = task->imm_count; 397 r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG); 398 r2t->exp_statsn = cpu_to_be32(conn->exp_statsn); 399 } 400 401 if (!task->unsol_r2t.data_length) 402 /* No unsolicit Data-Out's */ 403 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 404 } else { 405 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 406 zero_data(hdr->dlength); 407 408 if (sc->sc_data_direction == DMA_FROM_DEVICE) 409 hdr->flags |= ISCSI_FLAG_CMD_READ; 410 } 411 412 /* calculate size of additional header segments (AHSs) */ 413 hdrlength = task->hdr_len - sizeof(*hdr); 414 415 WARN_ON(hdrlength & (ISCSI_PAD_LEN-1)); 416 hdrlength /= ISCSI_PAD_LEN; 417 418 WARN_ON(hdrlength >= 256); 419 hdr->hlength = hdrlength & 0xFF; 420 hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn); 421 422 if (session->tt->init_task && session->tt->init_task(task)) 423 return -EIO; 424 425 task->state = ISCSI_TASK_RUNNING; 426 session->cmdsn++; 427 428 conn->scsicmd_pdus_cnt++; 429 ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x " 430 "itt 0x%x len %d cmdsn %d win %d]\n", 431 sc->sc_data_direction == DMA_TO_DEVICE ? 432 "write" : "read", conn->id, sc, sc->cmnd[0], 433 task->itt, transfer_length, 434 session->cmdsn, 435 session->max_cmdsn - session->exp_cmdsn + 1); 436 return 0; 437 } 438 439 /** 440 * iscsi_free_task - free a task 441 * @task: iscsi cmd task 442 * 443 * Must be called with session back_lock. 444 * This function returns the scsi command to scsi-ml or cleans 445 * up mgmt tasks then returns the task to the pool. 446 */ 447 static void iscsi_free_task(struct iscsi_task *task) 448 { 449 struct iscsi_conn *conn = task->conn; 450 struct iscsi_session *session = conn->session; 451 struct scsi_cmnd *sc = task->sc; 452 int oldstate = task->state; 453 454 ISCSI_DBG_SESSION(session, "freeing task itt 0x%x state %d sc %p\n", 455 task->itt, task->state, task->sc); 456 457 session->tt->cleanup_task(task); 458 task->state = ISCSI_TASK_FREE; 459 task->sc = NULL; 460 /* 461 * login task is preallocated so do not free 462 */ 463 if (conn->login_task == task) 464 return; 465 466 kfifo_in(&session->cmdpool.queue, (void*)&task, sizeof(void*)); 467 468 if (sc) { 469 /* SCSI eh reuses commands to verify us */ 470 sc->SCp.ptr = NULL; 471 /* 472 * queue command may call this to free the task, so 473 * it will decide how to return sc to scsi-ml. 474 */ 475 if (oldstate != ISCSI_TASK_REQUEUE_SCSIQ) 476 sc->scsi_done(sc); 477 } 478 } 479 480 void __iscsi_get_task(struct iscsi_task *task) 481 { 482 refcount_inc(&task->refcount); 483 } 484 EXPORT_SYMBOL_GPL(__iscsi_get_task); 485 486 void __iscsi_put_task(struct iscsi_task *task) 487 { 488 if (refcount_dec_and_test(&task->refcount)) 489 iscsi_free_task(task); 490 } 491 EXPORT_SYMBOL_GPL(__iscsi_put_task); 492 493 void iscsi_put_task(struct iscsi_task *task) 494 { 495 struct iscsi_session *session = task->conn->session; 496 497 /* regular RX path uses back_lock */ 498 spin_lock_bh(&session->back_lock); 499 __iscsi_put_task(task); 500 spin_unlock_bh(&session->back_lock); 501 } 502 EXPORT_SYMBOL_GPL(iscsi_put_task); 503 504 /** 505 * iscsi_complete_task - finish a task 506 * @task: iscsi cmd task 507 * @state: state to complete task with 508 * 509 * Must be called with session back_lock. 510 */ 511 static void iscsi_complete_task(struct iscsi_task *task, int state) 512 { 513 struct iscsi_conn *conn = task->conn; 514 515 ISCSI_DBG_SESSION(conn->session, 516 "complete task itt 0x%x state %d sc %p\n", 517 task->itt, task->state, task->sc); 518 if (task->state == ISCSI_TASK_COMPLETED || 519 task->state == ISCSI_TASK_ABRT_TMF || 520 task->state == ISCSI_TASK_ABRT_SESS_RECOV || 521 task->state == ISCSI_TASK_REQUEUE_SCSIQ) 522 return; 523 WARN_ON_ONCE(task->state == ISCSI_TASK_FREE); 524 task->state = state; 525 526 spin_lock_bh(&conn->taskqueuelock); 527 if (!list_empty(&task->running)) { 528 pr_debug_once("%s while task on list", __func__); 529 list_del_init(&task->running); 530 } 531 spin_unlock_bh(&conn->taskqueuelock); 532 533 if (conn->task == task) 534 conn->task = NULL; 535 536 if (READ_ONCE(conn->ping_task) == task) 537 WRITE_ONCE(conn->ping_task, NULL); 538 539 /* release get from queueing */ 540 __iscsi_put_task(task); 541 } 542 543 /** 544 * iscsi_complete_scsi_task - finish scsi task normally 545 * @task: iscsi task for scsi cmd 546 * @exp_cmdsn: expected cmd sn in cpu format 547 * @max_cmdsn: max cmd sn in cpu format 548 * 549 * This is used when drivers do not need or cannot perform 550 * lower level pdu processing. 551 * 552 * Called with session back_lock 553 */ 554 void iscsi_complete_scsi_task(struct iscsi_task *task, 555 uint32_t exp_cmdsn, uint32_t max_cmdsn) 556 { 557 struct iscsi_conn *conn = task->conn; 558 559 ISCSI_DBG_SESSION(conn->session, "[itt 0x%x]\n", task->itt); 560 561 conn->last_recv = jiffies; 562 __iscsi_update_cmdsn(conn->session, exp_cmdsn, max_cmdsn); 563 iscsi_complete_task(task, ISCSI_TASK_COMPLETED); 564 } 565 EXPORT_SYMBOL_GPL(iscsi_complete_scsi_task); 566 567 568 /* 569 * session back_lock must be held and if not called for a task that is 570 * still pending or from the xmit thread, then xmit thread must 571 * be suspended. 572 */ 573 static void fail_scsi_task(struct iscsi_task *task, int err) 574 { 575 struct iscsi_conn *conn = task->conn; 576 struct scsi_cmnd *sc; 577 int state; 578 579 /* 580 * if a command completes and we get a successful tmf response 581 * we will hit this because the scsi eh abort code does not take 582 * a ref to the task. 583 */ 584 sc = task->sc; 585 if (!sc) 586 return; 587 588 if (task->state == ISCSI_TASK_PENDING) { 589 /* 590 * cmd never made it to the xmit thread, so we should not count 591 * the cmd in the sequencing 592 */ 593 conn->session->queued_cmdsn--; 594 /* it was never sent so just complete like normal */ 595 state = ISCSI_TASK_COMPLETED; 596 } else if (err == DID_TRANSPORT_DISRUPTED) 597 state = ISCSI_TASK_ABRT_SESS_RECOV; 598 else 599 state = ISCSI_TASK_ABRT_TMF; 600 601 sc->result = err << 16; 602 scsi_set_resid(sc, scsi_bufflen(sc)); 603 604 /* regular RX path uses back_lock */ 605 spin_lock_bh(&conn->session->back_lock); 606 iscsi_complete_task(task, state); 607 spin_unlock_bh(&conn->session->back_lock); 608 } 609 610 static int iscsi_prep_mgmt_task(struct iscsi_conn *conn, 611 struct iscsi_task *task) 612 { 613 struct iscsi_session *session = conn->session; 614 struct iscsi_hdr *hdr = task->hdr; 615 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr; 616 uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK; 617 618 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) 619 return -ENOTCONN; 620 621 if (opcode != ISCSI_OP_LOGIN && opcode != ISCSI_OP_TEXT) 622 nop->exp_statsn = cpu_to_be32(conn->exp_statsn); 623 /* 624 * pre-format CmdSN for outgoing PDU. 625 */ 626 nop->cmdsn = cpu_to_be32(session->cmdsn); 627 if (hdr->itt != RESERVED_ITT) { 628 /* 629 * TODO: We always use immediate for normal session pdus. 630 * If we start to send tmfs or nops as non-immediate then 631 * we should start checking the cmdsn numbers for mgmt tasks. 632 * 633 * During discovery sessions iscsid sends TEXT as non immediate, 634 * but we always only send one PDU at a time. 635 */ 636 if (conn->c_stage == ISCSI_CONN_STARTED && 637 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 638 session->queued_cmdsn++; 639 session->cmdsn++; 640 } 641 } 642 643 if (session->tt->init_task && session->tt->init_task(task)) 644 return -EIO; 645 646 if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT) 647 session->state = ISCSI_STATE_LOGGING_OUT; 648 649 task->state = ISCSI_TASK_RUNNING; 650 ISCSI_DBG_SESSION(session, "mgmtpdu [op 0x%x hdr->itt 0x%x " 651 "datalen %d]\n", hdr->opcode & ISCSI_OPCODE_MASK, 652 hdr->itt, task->data_count); 653 return 0; 654 } 655 656 static struct iscsi_task * 657 __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 658 char *data, uint32_t data_size) 659 { 660 struct iscsi_session *session = conn->session; 661 struct iscsi_host *ihost = shost_priv(session->host); 662 uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK; 663 struct iscsi_task *task; 664 itt_t itt; 665 666 if (session->state == ISCSI_STATE_TERMINATE) 667 return NULL; 668 669 if (opcode == ISCSI_OP_LOGIN || opcode == ISCSI_OP_TEXT) { 670 /* 671 * Login and Text are sent serially, in 672 * request-followed-by-response sequence. 673 * Same task can be used. Same ITT must be used. 674 * Note that login_task is preallocated at conn_create(). 675 */ 676 if (conn->login_task->state != ISCSI_TASK_FREE) { 677 iscsi_conn_printk(KERN_ERR, conn, "Login/Text in " 678 "progress. Cannot start new task.\n"); 679 return NULL; 680 } 681 682 if (data_size > ISCSI_DEF_MAX_RECV_SEG_LEN) { 683 iscsi_conn_printk(KERN_ERR, conn, "Invalid buffer len of %u for login task. Max len is %u\n", data_size, ISCSI_DEF_MAX_RECV_SEG_LEN); 684 return NULL; 685 } 686 687 task = conn->login_task; 688 } else { 689 if (session->state != ISCSI_STATE_LOGGED_IN) 690 return NULL; 691 692 if (data_size != 0) { 693 iscsi_conn_printk(KERN_ERR, conn, "Can not send data buffer of len %u for op 0x%x\n", data_size, opcode); 694 return NULL; 695 } 696 697 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE); 698 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED); 699 700 if (!kfifo_out(&session->cmdpool.queue, 701 (void*)&task, sizeof(void*))) 702 return NULL; 703 } 704 /* 705 * released in complete pdu for task we expect a response for, and 706 * released by the lld when it has transmitted the task for 707 * pdus we do not expect a response for. 708 */ 709 refcount_set(&task->refcount, 1); 710 task->conn = conn; 711 task->sc = NULL; 712 INIT_LIST_HEAD(&task->running); 713 task->state = ISCSI_TASK_PENDING; 714 715 if (data_size) { 716 memcpy(task->data, data, data_size); 717 task->data_count = data_size; 718 } else 719 task->data_count = 0; 720 721 if (conn->session->tt->alloc_pdu) { 722 if (conn->session->tt->alloc_pdu(task, hdr->opcode)) { 723 iscsi_conn_printk(KERN_ERR, conn, "Could not allocate " 724 "pdu for mgmt task.\n"); 725 goto free_task; 726 } 727 } 728 729 itt = task->hdr->itt; 730 task->hdr_len = sizeof(struct iscsi_hdr); 731 memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr)); 732 733 if (hdr->itt != RESERVED_ITT) { 734 if (session->tt->parse_pdu_itt) 735 task->hdr->itt = itt; 736 else 737 task->hdr->itt = build_itt(task->itt, 738 task->conn->session->age); 739 } 740 741 if (unlikely(READ_ONCE(conn->ping_task) == INVALID_SCSI_TASK)) 742 WRITE_ONCE(conn->ping_task, task); 743 744 if (!ihost->workq) { 745 if (iscsi_prep_mgmt_task(conn, task)) 746 goto free_task; 747 748 if (session->tt->xmit_task(task)) 749 goto free_task; 750 } else { 751 spin_lock_bh(&conn->taskqueuelock); 752 list_add_tail(&task->running, &conn->mgmtqueue); 753 spin_unlock_bh(&conn->taskqueuelock); 754 iscsi_conn_queue_work(conn); 755 } 756 757 return task; 758 759 free_task: 760 /* regular RX path uses back_lock */ 761 spin_lock(&session->back_lock); 762 __iscsi_put_task(task); 763 spin_unlock(&session->back_lock); 764 return NULL; 765 } 766 767 int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr, 768 char *data, uint32_t data_size) 769 { 770 struct iscsi_conn *conn = cls_conn->dd_data; 771 struct iscsi_session *session = conn->session; 772 int err = 0; 773 774 spin_lock_bh(&session->frwd_lock); 775 if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size)) 776 err = -EPERM; 777 spin_unlock_bh(&session->frwd_lock); 778 return err; 779 } 780 EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu); 781 782 /** 783 * iscsi_scsi_cmd_rsp - SCSI Command Response processing 784 * @conn: iscsi connection 785 * @hdr: iscsi header 786 * @task: scsi command task 787 * @data: cmd data buffer 788 * @datalen: len of buffer 789 * 790 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and 791 * then completes the command and task. called under back_lock 792 **/ 793 static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 794 struct iscsi_task *task, char *data, 795 int datalen) 796 { 797 struct iscsi_scsi_rsp *rhdr = (struct iscsi_scsi_rsp *)hdr; 798 struct iscsi_session *session = conn->session; 799 struct scsi_cmnd *sc = task->sc; 800 801 iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); 802 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; 803 804 sc->result = (DID_OK << 16) | rhdr->cmd_status; 805 806 if (task->protected) { 807 sector_t sector; 808 u8 ascq; 809 810 /** 811 * Transports that didn't implement check_protection 812 * callback but still published T10-PI support to scsi-mid 813 * deserve this BUG_ON. 814 **/ 815 BUG_ON(!session->tt->check_protection); 816 817 ascq = session->tt->check_protection(task, §or); 818 if (ascq) { 819 sc->result = DRIVER_SENSE << 24 | 820 SAM_STAT_CHECK_CONDITION; 821 scsi_build_sense_buffer(1, sc->sense_buffer, 822 ILLEGAL_REQUEST, 0x10, ascq); 823 scsi_set_sense_information(sc->sense_buffer, 824 SCSI_SENSE_BUFFERSIZE, 825 sector); 826 goto out; 827 } 828 } 829 830 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) { 831 sc->result = DID_ERROR << 16; 832 goto out; 833 } 834 835 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) { 836 uint16_t senselen; 837 838 if (datalen < 2) { 839 invalid_datalen: 840 iscsi_conn_printk(KERN_ERR, conn, 841 "Got CHECK_CONDITION but invalid data " 842 "buffer size of %d\n", datalen); 843 sc->result = DID_BAD_TARGET << 16; 844 goto out; 845 } 846 847 senselen = get_unaligned_be16(data); 848 if (datalen < senselen) 849 goto invalid_datalen; 850 851 memcpy(sc->sense_buffer, data + 2, 852 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); 853 ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n", 854 min_t(uint16_t, senselen, 855 SCSI_SENSE_BUFFERSIZE)); 856 } 857 858 if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW | 859 ISCSI_FLAG_CMD_BIDI_OVERFLOW)) { 860 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; 861 } 862 863 if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW | 864 ISCSI_FLAG_CMD_OVERFLOW)) { 865 int res_count = be32_to_cpu(rhdr->residual_count); 866 867 if (res_count > 0 && 868 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || 869 res_count <= scsi_bufflen(sc))) 870 /* write side for bidi or uni-io set_resid */ 871 scsi_set_resid(sc, res_count); 872 else 873 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; 874 } 875 out: 876 ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n", 877 sc, sc->result, task->itt); 878 conn->scsirsp_pdus_cnt++; 879 iscsi_complete_task(task, ISCSI_TASK_COMPLETED); 880 } 881 882 /** 883 * iscsi_data_in_rsp - SCSI Data-In Response processing 884 * @conn: iscsi connection 885 * @hdr: iscsi pdu 886 * @task: scsi command task 887 * 888 * iscsi_data_in_rsp sets up the scsi_cmnd fields based on the data received 889 * then completes the command and task. called under back_lock 890 **/ 891 static void 892 iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 893 struct iscsi_task *task) 894 { 895 struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr; 896 struct scsi_cmnd *sc = task->sc; 897 898 if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS)) 899 return; 900 901 iscsi_update_cmdsn(conn->session, (struct iscsi_nopin *)hdr); 902 sc->result = (DID_OK << 16) | rhdr->cmd_status; 903 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; 904 if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW | 905 ISCSI_FLAG_DATA_OVERFLOW)) { 906 int res_count = be32_to_cpu(rhdr->residual_count); 907 908 if (res_count > 0 && 909 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || 910 res_count <= sc->sdb.length)) 911 scsi_set_resid(sc, res_count); 912 else 913 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; 914 } 915 916 ISCSI_DBG_SESSION(conn->session, "data in with status done " 917 "[sc %p res %d itt 0x%x]\n", 918 sc, sc->result, task->itt); 919 conn->scsirsp_pdus_cnt++; 920 iscsi_complete_task(task, ISCSI_TASK_COMPLETED); 921 } 922 923 static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr) 924 { 925 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr; 926 927 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; 928 conn->tmfrsp_pdus_cnt++; 929 930 if (conn->tmf_state != TMF_QUEUED) 931 return; 932 933 if (tmf->response == ISCSI_TMF_RSP_COMPLETE) 934 conn->tmf_state = TMF_SUCCESS; 935 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK) 936 conn->tmf_state = TMF_NOT_FOUND; 937 else 938 conn->tmf_state = TMF_FAILED; 939 wake_up(&conn->ehwait); 940 } 941 942 static int iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr) 943 { 944 struct iscsi_nopout hdr; 945 struct iscsi_task *task; 946 947 if (!rhdr) { 948 if (READ_ONCE(conn->ping_task)) 949 return -EINVAL; 950 WRITE_ONCE(conn->ping_task, INVALID_SCSI_TASK); 951 } 952 953 memset(&hdr, 0, sizeof(struct iscsi_nopout)); 954 hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE; 955 hdr.flags = ISCSI_FLAG_CMD_FINAL; 956 957 if (rhdr) { 958 hdr.lun = rhdr->lun; 959 hdr.ttt = rhdr->ttt; 960 hdr.itt = RESERVED_ITT; 961 } else 962 hdr.ttt = RESERVED_ITT; 963 964 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0); 965 if (!task) { 966 if (!rhdr) 967 WRITE_ONCE(conn->ping_task, NULL); 968 iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n"); 969 return -EIO; 970 } else if (!rhdr) { 971 /* only track our nops */ 972 conn->last_ping = jiffies; 973 } 974 975 return 0; 976 } 977 978 /** 979 * iscsi_nop_out_rsp - SCSI NOP Response processing 980 * @task: scsi command task 981 * @nop: the nop structure 982 * @data: where to put the data 983 * @datalen: length of data 984 * 985 * iscsi_nop_out_rsp handles nop response from use or 986 * from user space. called under back_lock 987 **/ 988 static int iscsi_nop_out_rsp(struct iscsi_task *task, 989 struct iscsi_nopin *nop, char *data, int datalen) 990 { 991 struct iscsi_conn *conn = task->conn; 992 int rc = 0; 993 994 if (READ_ONCE(conn->ping_task) != task) { 995 /* 996 * If this is not in response to one of our 997 * nops then it must be from userspace. 998 */ 999 if (iscsi_recv_pdu(conn->cls_conn, (struct iscsi_hdr *)nop, 1000 data, datalen)) 1001 rc = ISCSI_ERR_CONN_FAILED; 1002 } else 1003 mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout); 1004 iscsi_complete_task(task, ISCSI_TASK_COMPLETED); 1005 return rc; 1006 } 1007 1008 static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 1009 char *data, int datalen) 1010 { 1011 struct iscsi_reject *reject = (struct iscsi_reject *)hdr; 1012 struct iscsi_hdr rejected_pdu; 1013 int opcode, rc = 0; 1014 1015 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1; 1016 1017 if (ntoh24(reject->dlength) > datalen || 1018 ntoh24(reject->dlength) < sizeof(struct iscsi_hdr)) { 1019 iscsi_conn_printk(KERN_ERR, conn, "Cannot handle rejected " 1020 "pdu. Invalid data length (pdu dlength " 1021 "%u, datalen %d\n", ntoh24(reject->dlength), 1022 datalen); 1023 return ISCSI_ERR_PROTO; 1024 } 1025 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr)); 1026 opcode = rejected_pdu.opcode & ISCSI_OPCODE_MASK; 1027 1028 switch (reject->reason) { 1029 case ISCSI_REASON_DATA_DIGEST_ERROR: 1030 iscsi_conn_printk(KERN_ERR, conn, 1031 "pdu (op 0x%x itt 0x%x) rejected " 1032 "due to DataDigest error.\n", 1033 opcode, rejected_pdu.itt); 1034 break; 1035 case ISCSI_REASON_IMM_CMD_REJECT: 1036 iscsi_conn_printk(KERN_ERR, conn, 1037 "pdu (op 0x%x itt 0x%x) rejected. Too many " 1038 "immediate commands.\n", 1039 opcode, rejected_pdu.itt); 1040 /* 1041 * We only send one TMF at a time so if the target could not 1042 * handle it, then it should get fixed (RFC mandates that 1043 * a target can handle one immediate TMF per conn). 1044 * 1045 * For nops-outs, we could have sent more than one if 1046 * the target is sending us lots of nop-ins 1047 */ 1048 if (opcode != ISCSI_OP_NOOP_OUT) 1049 return 0; 1050 1051 if (rejected_pdu.itt == cpu_to_be32(ISCSI_RESERVED_TAG)) { 1052 /* 1053 * nop-out in response to target's nop-out rejected. 1054 * Just resend. 1055 */ 1056 /* In RX path we are under back lock */ 1057 spin_unlock(&conn->session->back_lock); 1058 spin_lock(&conn->session->frwd_lock); 1059 iscsi_send_nopout(conn, 1060 (struct iscsi_nopin*)&rejected_pdu); 1061 spin_unlock(&conn->session->frwd_lock); 1062 spin_lock(&conn->session->back_lock); 1063 } else { 1064 struct iscsi_task *task; 1065 /* 1066 * Our nop as ping got dropped. We know the target 1067 * and transport are ok so just clean up 1068 */ 1069 task = iscsi_itt_to_task(conn, rejected_pdu.itt); 1070 if (!task) { 1071 iscsi_conn_printk(KERN_ERR, conn, 1072 "Invalid pdu reject. Could " 1073 "not lookup rejected task.\n"); 1074 rc = ISCSI_ERR_BAD_ITT; 1075 } else 1076 rc = iscsi_nop_out_rsp(task, 1077 (struct iscsi_nopin*)&rejected_pdu, 1078 NULL, 0); 1079 } 1080 break; 1081 default: 1082 iscsi_conn_printk(KERN_ERR, conn, 1083 "pdu (op 0x%x itt 0x%x) rejected. Reason " 1084 "code 0x%x\n", rejected_pdu.opcode, 1085 rejected_pdu.itt, reject->reason); 1086 break; 1087 } 1088 return rc; 1089 } 1090 1091 /** 1092 * iscsi_itt_to_task - look up task by itt 1093 * @conn: iscsi connection 1094 * @itt: itt 1095 * 1096 * This should be used for mgmt tasks like login and nops, or if 1097 * the LDD's itt space does not include the session age. 1098 * 1099 * The session back_lock must be held. 1100 */ 1101 struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt) 1102 { 1103 struct iscsi_session *session = conn->session; 1104 int i; 1105 1106 if (itt == RESERVED_ITT) 1107 return NULL; 1108 1109 if (session->tt->parse_pdu_itt) 1110 session->tt->parse_pdu_itt(conn, itt, &i, NULL); 1111 else 1112 i = get_itt(itt); 1113 if (i >= session->cmds_max) 1114 return NULL; 1115 1116 return session->cmds[i]; 1117 } 1118 EXPORT_SYMBOL_GPL(iscsi_itt_to_task); 1119 1120 /** 1121 * __iscsi_complete_pdu - complete pdu 1122 * @conn: iscsi conn 1123 * @hdr: iscsi header 1124 * @data: data buffer 1125 * @datalen: len of data buffer 1126 * 1127 * Completes pdu processing by freeing any resources allocated at 1128 * queuecommand or send generic. session back_lock must be held and verify 1129 * itt must have been called. 1130 */ 1131 int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 1132 char *data, int datalen) 1133 { 1134 struct iscsi_session *session = conn->session; 1135 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0; 1136 struct iscsi_task *task; 1137 uint32_t itt; 1138 1139 conn->last_recv = jiffies; 1140 rc = iscsi_verify_itt(conn, hdr->itt); 1141 if (rc) 1142 return rc; 1143 1144 if (hdr->itt != RESERVED_ITT) 1145 itt = get_itt(hdr->itt); 1146 else 1147 itt = ~0U; 1148 1149 ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n", 1150 opcode, conn->id, itt, datalen); 1151 1152 if (itt == ~0U) { 1153 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); 1154 1155 switch(opcode) { 1156 case ISCSI_OP_NOOP_IN: 1157 if (datalen) { 1158 rc = ISCSI_ERR_PROTO; 1159 break; 1160 } 1161 1162 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG)) 1163 break; 1164 1165 /* In RX path we are under back lock */ 1166 spin_unlock(&session->back_lock); 1167 spin_lock(&session->frwd_lock); 1168 iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr); 1169 spin_unlock(&session->frwd_lock); 1170 spin_lock(&session->back_lock); 1171 break; 1172 case ISCSI_OP_REJECT: 1173 rc = iscsi_handle_reject(conn, hdr, data, datalen); 1174 break; 1175 case ISCSI_OP_ASYNC_EVENT: 1176 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; 1177 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) 1178 rc = ISCSI_ERR_CONN_FAILED; 1179 break; 1180 default: 1181 rc = ISCSI_ERR_BAD_OPCODE; 1182 break; 1183 } 1184 goto out; 1185 } 1186 1187 switch(opcode) { 1188 case ISCSI_OP_SCSI_CMD_RSP: 1189 case ISCSI_OP_SCSI_DATA_IN: 1190 task = iscsi_itt_to_ctask(conn, hdr->itt); 1191 if (!task) 1192 return ISCSI_ERR_BAD_ITT; 1193 task->last_xfer = jiffies; 1194 break; 1195 case ISCSI_OP_R2T: 1196 /* 1197 * LLD handles R2Ts if they need to. 1198 */ 1199 return 0; 1200 case ISCSI_OP_LOGOUT_RSP: 1201 case ISCSI_OP_LOGIN_RSP: 1202 case ISCSI_OP_TEXT_RSP: 1203 case ISCSI_OP_SCSI_TMFUNC_RSP: 1204 case ISCSI_OP_NOOP_IN: 1205 task = iscsi_itt_to_task(conn, hdr->itt); 1206 if (!task) 1207 return ISCSI_ERR_BAD_ITT; 1208 break; 1209 default: 1210 return ISCSI_ERR_BAD_OPCODE; 1211 } 1212 1213 switch(opcode) { 1214 case ISCSI_OP_SCSI_CMD_RSP: 1215 iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen); 1216 break; 1217 case ISCSI_OP_SCSI_DATA_IN: 1218 iscsi_data_in_rsp(conn, hdr, task); 1219 break; 1220 case ISCSI_OP_LOGOUT_RSP: 1221 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); 1222 if (datalen) { 1223 rc = ISCSI_ERR_PROTO; 1224 break; 1225 } 1226 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; 1227 goto recv_pdu; 1228 case ISCSI_OP_LOGIN_RSP: 1229 case ISCSI_OP_TEXT_RSP: 1230 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); 1231 /* 1232 * login related PDU's exp_statsn is handled in 1233 * userspace 1234 */ 1235 goto recv_pdu; 1236 case ISCSI_OP_SCSI_TMFUNC_RSP: 1237 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); 1238 if (datalen) { 1239 rc = ISCSI_ERR_PROTO; 1240 break; 1241 } 1242 1243 iscsi_tmf_rsp(conn, hdr); 1244 iscsi_complete_task(task, ISCSI_TASK_COMPLETED); 1245 break; 1246 case ISCSI_OP_NOOP_IN: 1247 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); 1248 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) { 1249 rc = ISCSI_ERR_PROTO; 1250 break; 1251 } 1252 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; 1253 1254 rc = iscsi_nop_out_rsp(task, (struct iscsi_nopin*)hdr, 1255 data, datalen); 1256 break; 1257 default: 1258 rc = ISCSI_ERR_BAD_OPCODE; 1259 break; 1260 } 1261 1262 out: 1263 return rc; 1264 recv_pdu: 1265 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) 1266 rc = ISCSI_ERR_CONN_FAILED; 1267 iscsi_complete_task(task, ISCSI_TASK_COMPLETED); 1268 return rc; 1269 } 1270 EXPORT_SYMBOL_GPL(__iscsi_complete_pdu); 1271 1272 int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 1273 char *data, int datalen) 1274 { 1275 int rc; 1276 1277 spin_lock(&conn->session->back_lock); 1278 rc = __iscsi_complete_pdu(conn, hdr, data, datalen); 1279 spin_unlock(&conn->session->back_lock); 1280 return rc; 1281 } 1282 EXPORT_SYMBOL_GPL(iscsi_complete_pdu); 1283 1284 int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt) 1285 { 1286 struct iscsi_session *session = conn->session; 1287 int age = 0, i = 0; 1288 1289 if (itt == RESERVED_ITT) 1290 return 0; 1291 1292 if (session->tt->parse_pdu_itt) 1293 session->tt->parse_pdu_itt(conn, itt, &i, &age); 1294 else { 1295 i = get_itt(itt); 1296 age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK; 1297 } 1298 1299 if (age != session->age) { 1300 iscsi_conn_printk(KERN_ERR, conn, 1301 "received itt %x expected session age (%x)\n", 1302 (__force u32)itt, session->age); 1303 return ISCSI_ERR_BAD_ITT; 1304 } 1305 1306 if (i >= session->cmds_max) { 1307 iscsi_conn_printk(KERN_ERR, conn, 1308 "received invalid itt index %u (max cmds " 1309 "%u.\n", i, session->cmds_max); 1310 return ISCSI_ERR_BAD_ITT; 1311 } 1312 return 0; 1313 } 1314 EXPORT_SYMBOL_GPL(iscsi_verify_itt); 1315 1316 /** 1317 * iscsi_itt_to_ctask - look up ctask by itt 1318 * @conn: iscsi connection 1319 * @itt: itt 1320 * 1321 * This should be used for cmd tasks. 1322 * 1323 * The session back_lock must be held. 1324 */ 1325 struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt) 1326 { 1327 struct iscsi_task *task; 1328 1329 if (iscsi_verify_itt(conn, itt)) 1330 return NULL; 1331 1332 task = iscsi_itt_to_task(conn, itt); 1333 if (!task || !task->sc) 1334 return NULL; 1335 1336 if (task->sc->SCp.phase != conn->session->age) { 1337 iscsi_session_printk(KERN_ERR, conn->session, 1338 "task's session age %d, expected %d\n", 1339 task->sc->SCp.phase, conn->session->age); 1340 return NULL; 1341 } 1342 1343 return task; 1344 } 1345 EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask); 1346 1347 void iscsi_session_failure(struct iscsi_session *session, 1348 enum iscsi_err err) 1349 { 1350 struct iscsi_conn *conn; 1351 struct device *dev; 1352 1353 spin_lock_bh(&session->frwd_lock); 1354 conn = session->leadconn; 1355 if (session->state == ISCSI_STATE_TERMINATE || !conn) { 1356 spin_unlock_bh(&session->frwd_lock); 1357 return; 1358 } 1359 1360 dev = get_device(&conn->cls_conn->dev); 1361 spin_unlock_bh(&session->frwd_lock); 1362 if (!dev) 1363 return; 1364 /* 1365 * if the host is being removed bypass the connection 1366 * recovery initialization because we are going to kill 1367 * the session. 1368 */ 1369 if (err == ISCSI_ERR_INVALID_HOST) 1370 iscsi_conn_error_event(conn->cls_conn, err); 1371 else 1372 iscsi_conn_failure(conn, err); 1373 put_device(dev); 1374 } 1375 EXPORT_SYMBOL_GPL(iscsi_session_failure); 1376 1377 void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err) 1378 { 1379 struct iscsi_session *session = conn->session; 1380 1381 spin_lock_bh(&session->frwd_lock); 1382 if (session->state == ISCSI_STATE_FAILED) { 1383 spin_unlock_bh(&session->frwd_lock); 1384 return; 1385 } 1386 1387 if (conn->stop_stage == 0) 1388 session->state = ISCSI_STATE_FAILED; 1389 spin_unlock_bh(&session->frwd_lock); 1390 1391 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); 1392 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); 1393 iscsi_conn_error_event(conn->cls_conn, err); 1394 } 1395 EXPORT_SYMBOL_GPL(iscsi_conn_failure); 1396 1397 static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn) 1398 { 1399 struct iscsi_session *session = conn->session; 1400 1401 /* 1402 * Check for iSCSI window and take care of CmdSN wrap-around 1403 */ 1404 if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) { 1405 ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn " 1406 "%u MaxCmdSN %u CmdSN %u/%u\n", 1407 session->exp_cmdsn, session->max_cmdsn, 1408 session->cmdsn, session->queued_cmdsn); 1409 return -ENOSPC; 1410 } 1411 return 0; 1412 } 1413 1414 static int iscsi_xmit_task(struct iscsi_conn *conn) 1415 { 1416 struct iscsi_task *task = conn->task; 1417 int rc; 1418 1419 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) 1420 return -ENODATA; 1421 1422 spin_lock_bh(&conn->session->back_lock); 1423 if (conn->task == NULL) { 1424 spin_unlock_bh(&conn->session->back_lock); 1425 return -ENODATA; 1426 } 1427 __iscsi_get_task(task); 1428 spin_unlock_bh(&conn->session->back_lock); 1429 spin_unlock_bh(&conn->session->frwd_lock); 1430 rc = conn->session->tt->xmit_task(task); 1431 spin_lock_bh(&conn->session->frwd_lock); 1432 if (!rc) { 1433 /* done with this task */ 1434 task->last_xfer = jiffies; 1435 conn->task = NULL; 1436 } 1437 /* regular RX path uses back_lock */ 1438 spin_lock(&conn->session->back_lock); 1439 __iscsi_put_task(task); 1440 spin_unlock(&conn->session->back_lock); 1441 return rc; 1442 } 1443 1444 /** 1445 * iscsi_requeue_task - requeue task to run from session workqueue 1446 * @task: task to requeue 1447 * 1448 * LLDs that need to run a task from the session workqueue should call 1449 * this. The session frwd_lock must be held. This should only be called 1450 * by software drivers. 1451 */ 1452 void iscsi_requeue_task(struct iscsi_task *task) 1453 { 1454 struct iscsi_conn *conn = task->conn; 1455 1456 /* 1457 * this may be on the requeue list already if the xmit_task callout 1458 * is handling the r2ts while we are adding new ones 1459 */ 1460 spin_lock_bh(&conn->taskqueuelock); 1461 if (list_empty(&task->running)) 1462 list_add_tail(&task->running, &conn->requeue); 1463 spin_unlock_bh(&conn->taskqueuelock); 1464 iscsi_conn_queue_work(conn); 1465 } 1466 EXPORT_SYMBOL_GPL(iscsi_requeue_task); 1467 1468 /** 1469 * iscsi_data_xmit - xmit any command into the scheduled connection 1470 * @conn: iscsi connection 1471 * 1472 * Notes: 1473 * The function can return -EAGAIN in which case the caller must 1474 * re-schedule it again later or recover. '0' return code means 1475 * successful xmit. 1476 **/ 1477 static int iscsi_data_xmit(struct iscsi_conn *conn) 1478 { 1479 struct iscsi_task *task; 1480 int rc = 0; 1481 1482 spin_lock_bh(&conn->session->frwd_lock); 1483 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) { 1484 ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n"); 1485 spin_unlock_bh(&conn->session->frwd_lock); 1486 return -ENODATA; 1487 } 1488 1489 if (conn->task) { 1490 rc = iscsi_xmit_task(conn); 1491 if (rc) 1492 goto done; 1493 } 1494 1495 /* 1496 * process mgmt pdus like nops before commands since we should 1497 * only have one nop-out as a ping from us and targets should not 1498 * overflow us with nop-ins 1499 */ 1500 spin_lock_bh(&conn->taskqueuelock); 1501 check_mgmt: 1502 while (!list_empty(&conn->mgmtqueue)) { 1503 conn->task = list_entry(conn->mgmtqueue.next, 1504 struct iscsi_task, running); 1505 list_del_init(&conn->task->running); 1506 spin_unlock_bh(&conn->taskqueuelock); 1507 if (iscsi_prep_mgmt_task(conn, conn->task)) { 1508 /* regular RX path uses back_lock */ 1509 spin_lock_bh(&conn->session->back_lock); 1510 __iscsi_put_task(conn->task); 1511 spin_unlock_bh(&conn->session->back_lock); 1512 conn->task = NULL; 1513 spin_lock_bh(&conn->taskqueuelock); 1514 continue; 1515 } 1516 rc = iscsi_xmit_task(conn); 1517 if (rc) 1518 goto done; 1519 spin_lock_bh(&conn->taskqueuelock); 1520 } 1521 1522 /* process pending command queue */ 1523 while (!list_empty(&conn->cmdqueue)) { 1524 conn->task = list_entry(conn->cmdqueue.next, struct iscsi_task, 1525 running); 1526 list_del_init(&conn->task->running); 1527 spin_unlock_bh(&conn->taskqueuelock); 1528 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) { 1529 fail_scsi_task(conn->task, DID_IMM_RETRY); 1530 spin_lock_bh(&conn->taskqueuelock); 1531 continue; 1532 } 1533 rc = iscsi_prep_scsi_cmd_pdu(conn->task); 1534 if (rc) { 1535 if (rc == -ENOMEM || rc == -EACCES) { 1536 spin_lock_bh(&conn->taskqueuelock); 1537 list_add_tail(&conn->task->running, 1538 &conn->cmdqueue); 1539 conn->task = NULL; 1540 spin_unlock_bh(&conn->taskqueuelock); 1541 goto done; 1542 } else 1543 fail_scsi_task(conn->task, DID_ABORT); 1544 spin_lock_bh(&conn->taskqueuelock); 1545 continue; 1546 } 1547 rc = iscsi_xmit_task(conn); 1548 if (rc) 1549 goto done; 1550 /* 1551 * we could continuously get new task requests so 1552 * we need to check the mgmt queue for nops that need to 1553 * be sent to aviod starvation 1554 */ 1555 spin_lock_bh(&conn->taskqueuelock); 1556 if (!list_empty(&conn->mgmtqueue)) 1557 goto check_mgmt; 1558 } 1559 1560 while (!list_empty(&conn->requeue)) { 1561 /* 1562 * we always do fastlogout - conn stop code will clean up. 1563 */ 1564 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) 1565 break; 1566 1567 task = list_entry(conn->requeue.next, struct iscsi_task, 1568 running); 1569 if (iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_DATA_OUT)) 1570 break; 1571 1572 conn->task = task; 1573 list_del_init(&conn->task->running); 1574 conn->task->state = ISCSI_TASK_RUNNING; 1575 spin_unlock_bh(&conn->taskqueuelock); 1576 rc = iscsi_xmit_task(conn); 1577 if (rc) 1578 goto done; 1579 spin_lock_bh(&conn->taskqueuelock); 1580 if (!list_empty(&conn->mgmtqueue)) 1581 goto check_mgmt; 1582 } 1583 spin_unlock_bh(&conn->taskqueuelock); 1584 spin_unlock_bh(&conn->session->frwd_lock); 1585 return -ENODATA; 1586 1587 done: 1588 spin_unlock_bh(&conn->session->frwd_lock); 1589 return rc; 1590 } 1591 1592 static void iscsi_xmitworker(struct work_struct *work) 1593 { 1594 struct iscsi_conn *conn = 1595 container_of(work, struct iscsi_conn, xmitwork); 1596 int rc; 1597 /* 1598 * serialize Xmit worker on a per-connection basis. 1599 */ 1600 do { 1601 rc = iscsi_data_xmit(conn); 1602 } while (rc >= 0 || rc == -EAGAIN); 1603 } 1604 1605 static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn, 1606 struct scsi_cmnd *sc) 1607 { 1608 struct iscsi_task *task; 1609 1610 if (!kfifo_out(&conn->session->cmdpool.queue, 1611 (void *) &task, sizeof(void *))) 1612 return NULL; 1613 1614 sc->SCp.phase = conn->session->age; 1615 sc->SCp.ptr = (char *) task; 1616 1617 refcount_set(&task->refcount, 1); 1618 task->state = ISCSI_TASK_PENDING; 1619 task->conn = conn; 1620 task->sc = sc; 1621 task->have_checked_conn = false; 1622 task->last_timeout = jiffies; 1623 task->last_xfer = jiffies; 1624 task->protected = false; 1625 INIT_LIST_HEAD(&task->running); 1626 return task; 1627 } 1628 1629 enum { 1630 FAILURE_BAD_HOST = 1, 1631 FAILURE_SESSION_FAILED, 1632 FAILURE_SESSION_FREED, 1633 FAILURE_WINDOW_CLOSED, 1634 FAILURE_OOM, 1635 FAILURE_SESSION_TERMINATE, 1636 FAILURE_SESSION_IN_RECOVERY, 1637 FAILURE_SESSION_RECOVERY_TIMEOUT, 1638 FAILURE_SESSION_LOGGING_OUT, 1639 FAILURE_SESSION_NOT_READY, 1640 }; 1641 1642 int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc) 1643 { 1644 struct iscsi_cls_session *cls_session; 1645 struct iscsi_host *ihost; 1646 int reason = 0; 1647 struct iscsi_session *session; 1648 struct iscsi_conn *conn; 1649 struct iscsi_task *task = NULL; 1650 1651 sc->result = 0; 1652 sc->SCp.ptr = NULL; 1653 1654 ihost = shost_priv(host); 1655 1656 cls_session = starget_to_session(scsi_target(sc->device)); 1657 session = cls_session->dd_data; 1658 spin_lock_bh(&session->frwd_lock); 1659 1660 reason = iscsi_session_chkready(cls_session); 1661 if (reason) { 1662 sc->result = reason; 1663 goto fault; 1664 } 1665 1666 if (session->state != ISCSI_STATE_LOGGED_IN) { 1667 /* 1668 * to handle the race between when we set the recovery state 1669 * and block the session we requeue here (commands could 1670 * be entering our queuecommand while a block is starting 1671 * up because the block code is not locked) 1672 */ 1673 switch (session->state) { 1674 case ISCSI_STATE_FAILED: 1675 /* 1676 * cmds should fail during shutdown, if the session 1677 * state is bad, allowing completion to happen 1678 */ 1679 if (unlikely(system_state != SYSTEM_RUNNING)) { 1680 reason = FAILURE_SESSION_FAILED; 1681 sc->result = DID_NO_CONNECT << 16; 1682 break; 1683 } 1684 fallthrough; 1685 case ISCSI_STATE_IN_RECOVERY: 1686 reason = FAILURE_SESSION_IN_RECOVERY; 1687 sc->result = DID_IMM_RETRY << 16; 1688 break; 1689 case ISCSI_STATE_LOGGING_OUT: 1690 reason = FAILURE_SESSION_LOGGING_OUT; 1691 sc->result = DID_IMM_RETRY << 16; 1692 break; 1693 case ISCSI_STATE_RECOVERY_FAILED: 1694 reason = FAILURE_SESSION_RECOVERY_TIMEOUT; 1695 sc->result = DID_TRANSPORT_FAILFAST << 16; 1696 break; 1697 case ISCSI_STATE_TERMINATE: 1698 reason = FAILURE_SESSION_TERMINATE; 1699 sc->result = DID_NO_CONNECT << 16; 1700 break; 1701 default: 1702 reason = FAILURE_SESSION_FREED; 1703 sc->result = DID_NO_CONNECT << 16; 1704 } 1705 goto fault; 1706 } 1707 1708 conn = session->leadconn; 1709 if (!conn) { 1710 reason = FAILURE_SESSION_FREED; 1711 sc->result = DID_NO_CONNECT << 16; 1712 goto fault; 1713 } 1714 1715 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) { 1716 reason = FAILURE_SESSION_IN_RECOVERY; 1717 sc->result = DID_REQUEUE << 16; 1718 goto fault; 1719 } 1720 1721 if (iscsi_check_cmdsn_window_closed(conn)) { 1722 reason = FAILURE_WINDOW_CLOSED; 1723 goto reject; 1724 } 1725 1726 task = iscsi_alloc_task(conn, sc); 1727 if (!task) { 1728 reason = FAILURE_OOM; 1729 goto reject; 1730 } 1731 1732 if (!ihost->workq) { 1733 reason = iscsi_prep_scsi_cmd_pdu(task); 1734 if (reason) { 1735 if (reason == -ENOMEM || reason == -EACCES) { 1736 reason = FAILURE_OOM; 1737 goto prepd_reject; 1738 } else { 1739 sc->result = DID_ABORT << 16; 1740 goto prepd_fault; 1741 } 1742 } 1743 if (session->tt->xmit_task(task)) { 1744 session->cmdsn--; 1745 reason = FAILURE_SESSION_NOT_READY; 1746 goto prepd_reject; 1747 } 1748 } else { 1749 spin_lock_bh(&conn->taskqueuelock); 1750 list_add_tail(&task->running, &conn->cmdqueue); 1751 spin_unlock_bh(&conn->taskqueuelock); 1752 iscsi_conn_queue_work(conn); 1753 } 1754 1755 session->queued_cmdsn++; 1756 spin_unlock_bh(&session->frwd_lock); 1757 return 0; 1758 1759 prepd_reject: 1760 spin_lock_bh(&session->back_lock); 1761 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ); 1762 spin_unlock_bh(&session->back_lock); 1763 reject: 1764 spin_unlock_bh(&session->frwd_lock); 1765 ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n", 1766 sc->cmnd[0], reason); 1767 return SCSI_MLQUEUE_TARGET_BUSY; 1768 1769 prepd_fault: 1770 spin_lock_bh(&session->back_lock); 1771 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ); 1772 spin_unlock_bh(&session->back_lock); 1773 fault: 1774 spin_unlock_bh(&session->frwd_lock); 1775 ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n", 1776 sc->cmnd[0], reason); 1777 scsi_set_resid(sc, scsi_bufflen(sc)); 1778 sc->scsi_done(sc); 1779 return 0; 1780 } 1781 EXPORT_SYMBOL_GPL(iscsi_queuecommand); 1782 1783 int iscsi_target_alloc(struct scsi_target *starget) 1784 { 1785 struct iscsi_cls_session *cls_session = starget_to_session(starget); 1786 struct iscsi_session *session = cls_session->dd_data; 1787 1788 starget->can_queue = session->scsi_cmds_max; 1789 return 0; 1790 } 1791 EXPORT_SYMBOL_GPL(iscsi_target_alloc); 1792 1793 static void iscsi_tmf_timedout(struct timer_list *t) 1794 { 1795 struct iscsi_conn *conn = from_timer(conn, t, tmf_timer); 1796 struct iscsi_session *session = conn->session; 1797 1798 spin_lock(&session->frwd_lock); 1799 if (conn->tmf_state == TMF_QUEUED) { 1800 conn->tmf_state = TMF_TIMEDOUT; 1801 ISCSI_DBG_EH(session, "tmf timedout\n"); 1802 /* unblock eh_abort() */ 1803 wake_up(&conn->ehwait); 1804 } 1805 spin_unlock(&session->frwd_lock); 1806 } 1807 1808 static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn, 1809 struct iscsi_tm *hdr, int age, 1810 int timeout) 1811 __must_hold(&session->frwd_lock) 1812 { 1813 struct iscsi_session *session = conn->session; 1814 struct iscsi_task *task; 1815 1816 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr, 1817 NULL, 0); 1818 if (!task) { 1819 spin_unlock_bh(&session->frwd_lock); 1820 iscsi_conn_printk(KERN_ERR, conn, "Could not send TMF.\n"); 1821 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); 1822 spin_lock_bh(&session->frwd_lock); 1823 return -EPERM; 1824 } 1825 conn->tmfcmd_pdus_cnt++; 1826 conn->tmf_timer.expires = timeout * HZ + jiffies; 1827 add_timer(&conn->tmf_timer); 1828 ISCSI_DBG_EH(session, "tmf set timeout\n"); 1829 1830 spin_unlock_bh(&session->frwd_lock); 1831 mutex_unlock(&session->eh_mutex); 1832 1833 /* 1834 * block eh thread until: 1835 * 1836 * 1) tmf response 1837 * 2) tmf timeout 1838 * 3) session is terminated or restarted or userspace has 1839 * given up on recovery 1840 */ 1841 wait_event_interruptible(conn->ehwait, age != session->age || 1842 session->state != ISCSI_STATE_LOGGED_IN || 1843 conn->tmf_state != TMF_QUEUED); 1844 if (signal_pending(current)) 1845 flush_signals(current); 1846 del_timer_sync(&conn->tmf_timer); 1847 1848 mutex_lock(&session->eh_mutex); 1849 spin_lock_bh(&session->frwd_lock); 1850 /* if the session drops it will clean up the task */ 1851 if (age != session->age || 1852 session->state != ISCSI_STATE_LOGGED_IN) 1853 return -ENOTCONN; 1854 return 0; 1855 } 1856 1857 /* 1858 * Fail commands. session lock held and recv side suspended and xmit 1859 * thread flushed 1860 */ 1861 static void fail_scsi_tasks(struct iscsi_conn *conn, u64 lun, int error) 1862 { 1863 struct iscsi_task *task; 1864 int i; 1865 1866 for (i = 0; i < conn->session->cmds_max; i++) { 1867 task = conn->session->cmds[i]; 1868 if (!task->sc || task->state == ISCSI_TASK_FREE) 1869 continue; 1870 1871 if (lun != -1 && lun != task->sc->device->lun) 1872 continue; 1873 1874 ISCSI_DBG_SESSION(conn->session, 1875 "failing sc %p itt 0x%x state %d\n", 1876 task->sc, task->itt, task->state); 1877 fail_scsi_task(task, error); 1878 } 1879 } 1880 1881 /** 1882 * iscsi_suspend_queue - suspend iscsi_queuecommand 1883 * @conn: iscsi conn to stop queueing IO on 1884 * 1885 * This grabs the session frwd_lock to make sure no one is in 1886 * xmit_task/queuecommand, and then sets suspend to prevent 1887 * new commands from being queued. This only needs to be called 1888 * by offload drivers that need to sync a path like ep disconnect 1889 * with the iscsi_queuecommand/xmit_task. To start IO again libiscsi 1890 * will call iscsi_start_tx and iscsi_unblock_session when in FFP. 1891 */ 1892 void iscsi_suspend_queue(struct iscsi_conn *conn) 1893 { 1894 spin_lock_bh(&conn->session->frwd_lock); 1895 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); 1896 spin_unlock_bh(&conn->session->frwd_lock); 1897 } 1898 EXPORT_SYMBOL_GPL(iscsi_suspend_queue); 1899 1900 /** 1901 * iscsi_suspend_tx - suspend iscsi_data_xmit 1902 * @conn: iscsi conn tp stop processing IO on. 1903 * 1904 * This function sets the suspend bit to prevent iscsi_data_xmit 1905 * from sending new IO, and if work is queued on the xmit thread 1906 * it will wait for it to be completed. 1907 */ 1908 void iscsi_suspend_tx(struct iscsi_conn *conn) 1909 { 1910 struct Scsi_Host *shost = conn->session->host; 1911 struct iscsi_host *ihost = shost_priv(shost); 1912 1913 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); 1914 if (ihost->workq) 1915 flush_workqueue(ihost->workq); 1916 } 1917 EXPORT_SYMBOL_GPL(iscsi_suspend_tx); 1918 1919 static void iscsi_start_tx(struct iscsi_conn *conn) 1920 { 1921 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); 1922 iscsi_conn_queue_work(conn); 1923 } 1924 1925 /* 1926 * We want to make sure a ping is in flight. It has timed out. 1927 * And we are not busy processing a pdu that is making 1928 * progress but got started before the ping and is taking a while 1929 * to complete so the ping is just stuck behind it in a queue. 1930 */ 1931 static int iscsi_has_ping_timed_out(struct iscsi_conn *conn) 1932 { 1933 if (READ_ONCE(conn->ping_task) && 1934 time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) + 1935 (conn->ping_timeout * HZ), jiffies)) 1936 return 1; 1937 else 1938 return 0; 1939 } 1940 1941 enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc) 1942 { 1943 enum blk_eh_timer_return rc = BLK_EH_DONE; 1944 struct iscsi_task *task = NULL, *running_task; 1945 struct iscsi_cls_session *cls_session; 1946 struct iscsi_session *session; 1947 struct iscsi_conn *conn; 1948 int i; 1949 1950 cls_session = starget_to_session(scsi_target(sc->device)); 1951 session = cls_session->dd_data; 1952 1953 ISCSI_DBG_EH(session, "scsi cmd %p timedout\n", sc); 1954 1955 spin_lock_bh(&session->frwd_lock); 1956 task = (struct iscsi_task *)sc->SCp.ptr; 1957 if (!task) { 1958 /* 1959 * Raced with completion. Blk layer has taken ownership 1960 * so let timeout code complete it now. 1961 */ 1962 rc = BLK_EH_DONE; 1963 goto done; 1964 } 1965 1966 if (session->state != ISCSI_STATE_LOGGED_IN) { 1967 /* 1968 * During shutdown, if session is prematurely disconnected, 1969 * recovery won't happen and there will be hung cmds. Not 1970 * handling cmds would trigger EH, also bad in this case. 1971 * Instead, handle cmd, allow completion to happen and let 1972 * upper layer to deal with the result. 1973 */ 1974 if (unlikely(system_state != SYSTEM_RUNNING)) { 1975 sc->result = DID_NO_CONNECT << 16; 1976 ISCSI_DBG_EH(session, "sc on shutdown, handled\n"); 1977 rc = BLK_EH_DONE; 1978 goto done; 1979 } 1980 /* 1981 * We are probably in the middle of iscsi recovery so let 1982 * that complete and handle the error. 1983 */ 1984 rc = BLK_EH_RESET_TIMER; 1985 goto done; 1986 } 1987 1988 conn = session->leadconn; 1989 if (!conn) { 1990 /* In the middle of shuting down */ 1991 rc = BLK_EH_RESET_TIMER; 1992 goto done; 1993 } 1994 1995 /* 1996 * If we have sent (at least queued to the network layer) a pdu or 1997 * recvd one for the task since the last timeout ask for 1998 * more time. If on the next timeout we have not made progress 1999 * we can check if it is the task or connection when we send the 2000 * nop as a ping. 2001 */ 2002 if (time_after(task->last_xfer, task->last_timeout)) { 2003 ISCSI_DBG_EH(session, "Command making progress. Asking " 2004 "scsi-ml for more time to complete. " 2005 "Last data xfer at %lu. Last timeout was at " 2006 "%lu\n.", task->last_xfer, task->last_timeout); 2007 task->have_checked_conn = false; 2008 rc = BLK_EH_RESET_TIMER; 2009 goto done; 2010 } 2011 2012 if (!conn->recv_timeout && !conn->ping_timeout) 2013 goto done; 2014 /* 2015 * if the ping timedout then we are in the middle of cleaning up 2016 * and can let the iscsi eh handle it 2017 */ 2018 if (iscsi_has_ping_timed_out(conn)) { 2019 rc = BLK_EH_RESET_TIMER; 2020 goto done; 2021 } 2022 2023 for (i = 0; i < conn->session->cmds_max; i++) { 2024 running_task = conn->session->cmds[i]; 2025 if (!running_task->sc || running_task == task || 2026 running_task->state != ISCSI_TASK_RUNNING) 2027 continue; 2028 2029 /* 2030 * Only check if cmds started before this one have made 2031 * progress, or this could never fail 2032 */ 2033 if (time_after(running_task->sc->jiffies_at_alloc, 2034 task->sc->jiffies_at_alloc)) 2035 continue; 2036 2037 if (time_after(running_task->last_xfer, task->last_timeout)) { 2038 /* 2039 * This task has not made progress, but a task 2040 * started before us has transferred data since 2041 * we started/last-checked. We could be queueing 2042 * too many tasks or the LU is bad. 2043 * 2044 * If the device is bad the cmds ahead of us on 2045 * other devs will complete, and this loop will 2046 * eventually fail starting the scsi eh. 2047 */ 2048 ISCSI_DBG_EH(session, "Command has not made progress " 2049 "but commands ahead of it have. " 2050 "Asking scsi-ml for more time to " 2051 "complete. Our last xfer vs running task " 2052 "last xfer %lu/%lu. Last check %lu.\n", 2053 task->last_xfer, running_task->last_xfer, 2054 task->last_timeout); 2055 rc = BLK_EH_RESET_TIMER; 2056 goto done; 2057 } 2058 } 2059 2060 /* Assumes nop timeout is shorter than scsi cmd timeout */ 2061 if (task->have_checked_conn) 2062 goto done; 2063 2064 /* 2065 * Checking the transport already or nop from a cmd timeout still 2066 * running 2067 */ 2068 if (READ_ONCE(conn->ping_task)) { 2069 task->have_checked_conn = true; 2070 rc = BLK_EH_RESET_TIMER; 2071 goto done; 2072 } 2073 2074 /* Make sure there is a transport check done */ 2075 iscsi_send_nopout(conn, NULL); 2076 task->have_checked_conn = true; 2077 rc = BLK_EH_RESET_TIMER; 2078 2079 done: 2080 if (task) 2081 task->last_timeout = jiffies; 2082 spin_unlock_bh(&session->frwd_lock); 2083 ISCSI_DBG_EH(session, "return %s\n", rc == BLK_EH_RESET_TIMER ? 2084 "timer reset" : "shutdown or nh"); 2085 return rc; 2086 } 2087 EXPORT_SYMBOL_GPL(iscsi_eh_cmd_timed_out); 2088 2089 static void iscsi_check_transport_timeouts(struct timer_list *t) 2090 { 2091 struct iscsi_conn *conn = from_timer(conn, t, transport_timer); 2092 struct iscsi_session *session = conn->session; 2093 unsigned long recv_timeout, next_timeout = 0, last_recv; 2094 2095 spin_lock(&session->frwd_lock); 2096 if (session->state != ISCSI_STATE_LOGGED_IN) 2097 goto done; 2098 2099 recv_timeout = conn->recv_timeout; 2100 if (!recv_timeout) 2101 goto done; 2102 2103 recv_timeout *= HZ; 2104 last_recv = conn->last_recv; 2105 2106 if (iscsi_has_ping_timed_out(conn)) { 2107 iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs " 2108 "expired, recv timeout %d, last rx %lu, " 2109 "last ping %lu, now %lu\n", 2110 conn->ping_timeout, conn->recv_timeout, 2111 last_recv, conn->last_ping, jiffies); 2112 spin_unlock(&session->frwd_lock); 2113 iscsi_conn_failure(conn, ISCSI_ERR_NOP_TIMEDOUT); 2114 return; 2115 } 2116 2117 if (time_before_eq(last_recv + recv_timeout, jiffies)) { 2118 /* send a ping to try to provoke some traffic */ 2119 ISCSI_DBG_CONN(conn, "Sending nopout as ping\n"); 2120 if (iscsi_send_nopout(conn, NULL)) 2121 next_timeout = jiffies + (1 * HZ); 2122 else 2123 next_timeout = conn->last_ping + (conn->ping_timeout * HZ); 2124 } else 2125 next_timeout = last_recv + recv_timeout; 2126 2127 ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout); 2128 mod_timer(&conn->transport_timer, next_timeout); 2129 done: 2130 spin_unlock(&session->frwd_lock); 2131 } 2132 2133 static void iscsi_prep_abort_task_pdu(struct iscsi_task *task, 2134 struct iscsi_tm *hdr) 2135 { 2136 memset(hdr, 0, sizeof(*hdr)); 2137 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; 2138 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK; 2139 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2140 hdr->lun = task->lun; 2141 hdr->rtt = task->hdr_itt; 2142 hdr->refcmdsn = task->cmdsn; 2143 } 2144 2145 int iscsi_eh_abort(struct scsi_cmnd *sc) 2146 { 2147 struct iscsi_cls_session *cls_session; 2148 struct iscsi_session *session; 2149 struct iscsi_conn *conn; 2150 struct iscsi_task *task; 2151 struct iscsi_tm *hdr; 2152 int age; 2153 2154 cls_session = starget_to_session(scsi_target(sc->device)); 2155 session = cls_session->dd_data; 2156 2157 ISCSI_DBG_EH(session, "aborting sc %p\n", sc); 2158 2159 mutex_lock(&session->eh_mutex); 2160 spin_lock_bh(&session->frwd_lock); 2161 /* 2162 * if session was ISCSI_STATE_IN_RECOVERY then we may not have 2163 * got the command. 2164 */ 2165 if (!sc->SCp.ptr) { 2166 ISCSI_DBG_EH(session, "sc never reached iscsi layer or " 2167 "it completed.\n"); 2168 spin_unlock_bh(&session->frwd_lock); 2169 mutex_unlock(&session->eh_mutex); 2170 return SUCCESS; 2171 } 2172 2173 /* 2174 * If we are not logged in or we have started a new session 2175 * then let the host reset code handle this 2176 */ 2177 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN || 2178 sc->SCp.phase != session->age) { 2179 spin_unlock_bh(&session->frwd_lock); 2180 mutex_unlock(&session->eh_mutex); 2181 ISCSI_DBG_EH(session, "failing abort due to dropped " 2182 "session.\n"); 2183 return FAILED; 2184 } 2185 2186 conn = session->leadconn; 2187 conn->eh_abort_cnt++; 2188 age = session->age; 2189 2190 task = (struct iscsi_task *)sc->SCp.ptr; 2191 ISCSI_DBG_EH(session, "aborting [sc %p itt 0x%x]\n", 2192 sc, task->itt); 2193 2194 /* task completed before time out */ 2195 if (!task->sc) { 2196 ISCSI_DBG_EH(session, "sc completed while abort in progress\n"); 2197 goto success; 2198 } 2199 2200 if (task->state == ISCSI_TASK_PENDING) { 2201 fail_scsi_task(task, DID_ABORT); 2202 goto success; 2203 } 2204 2205 /* only have one tmf outstanding at a time */ 2206 if (conn->tmf_state != TMF_INITIAL) 2207 goto failed; 2208 conn->tmf_state = TMF_QUEUED; 2209 2210 hdr = &conn->tmhdr; 2211 iscsi_prep_abort_task_pdu(task, hdr); 2212 2213 if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) 2214 goto failed; 2215 2216 switch (conn->tmf_state) { 2217 case TMF_SUCCESS: 2218 spin_unlock_bh(&session->frwd_lock); 2219 /* 2220 * stop tx side incase the target had sent a abort rsp but 2221 * the initiator was still writing out data. 2222 */ 2223 iscsi_suspend_tx(conn); 2224 /* 2225 * we do not stop the recv side because targets have been 2226 * good and have never sent us a successful tmf response 2227 * then sent more data for the cmd. 2228 */ 2229 spin_lock_bh(&session->frwd_lock); 2230 fail_scsi_task(task, DID_ABORT); 2231 conn->tmf_state = TMF_INITIAL; 2232 memset(hdr, 0, sizeof(*hdr)); 2233 spin_unlock_bh(&session->frwd_lock); 2234 iscsi_start_tx(conn); 2235 goto success_unlocked; 2236 case TMF_TIMEDOUT: 2237 spin_unlock_bh(&session->frwd_lock); 2238 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); 2239 goto failed_unlocked; 2240 case TMF_NOT_FOUND: 2241 if (!sc->SCp.ptr) { 2242 conn->tmf_state = TMF_INITIAL; 2243 memset(hdr, 0, sizeof(*hdr)); 2244 /* task completed before tmf abort response */ 2245 ISCSI_DBG_EH(session, "sc completed while abort in " 2246 "progress\n"); 2247 goto success; 2248 } 2249 fallthrough; 2250 default: 2251 conn->tmf_state = TMF_INITIAL; 2252 goto failed; 2253 } 2254 2255 success: 2256 spin_unlock_bh(&session->frwd_lock); 2257 success_unlocked: 2258 ISCSI_DBG_EH(session, "abort success [sc %p itt 0x%x]\n", 2259 sc, task->itt); 2260 mutex_unlock(&session->eh_mutex); 2261 return SUCCESS; 2262 2263 failed: 2264 spin_unlock_bh(&session->frwd_lock); 2265 failed_unlocked: 2266 ISCSI_DBG_EH(session, "abort failed [sc %p itt 0x%x]\n", sc, 2267 task ? task->itt : 0); 2268 mutex_unlock(&session->eh_mutex); 2269 return FAILED; 2270 } 2271 EXPORT_SYMBOL_GPL(iscsi_eh_abort); 2272 2273 static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) 2274 { 2275 memset(hdr, 0, sizeof(*hdr)); 2276 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; 2277 hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK; 2278 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2279 int_to_scsilun(sc->device->lun, &hdr->lun); 2280 hdr->rtt = RESERVED_ITT; 2281 } 2282 2283 int iscsi_eh_device_reset(struct scsi_cmnd *sc) 2284 { 2285 struct iscsi_cls_session *cls_session; 2286 struct iscsi_session *session; 2287 struct iscsi_conn *conn; 2288 struct iscsi_tm *hdr; 2289 int rc = FAILED; 2290 2291 cls_session = starget_to_session(scsi_target(sc->device)); 2292 session = cls_session->dd_data; 2293 2294 ISCSI_DBG_EH(session, "LU Reset [sc %p lun %llu]\n", sc, 2295 sc->device->lun); 2296 2297 mutex_lock(&session->eh_mutex); 2298 spin_lock_bh(&session->frwd_lock); 2299 /* 2300 * Just check if we are not logged in. We cannot check for 2301 * the phase because the reset could come from a ioctl. 2302 */ 2303 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) 2304 goto unlock; 2305 conn = session->leadconn; 2306 2307 /* only have one tmf outstanding at a time */ 2308 if (conn->tmf_state != TMF_INITIAL) 2309 goto unlock; 2310 conn->tmf_state = TMF_QUEUED; 2311 2312 hdr = &conn->tmhdr; 2313 iscsi_prep_lun_reset_pdu(sc, hdr); 2314 2315 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, 2316 session->lu_reset_timeout)) { 2317 rc = FAILED; 2318 goto unlock; 2319 } 2320 2321 switch (conn->tmf_state) { 2322 case TMF_SUCCESS: 2323 break; 2324 case TMF_TIMEDOUT: 2325 spin_unlock_bh(&session->frwd_lock); 2326 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); 2327 goto done; 2328 default: 2329 conn->tmf_state = TMF_INITIAL; 2330 goto unlock; 2331 } 2332 2333 rc = SUCCESS; 2334 spin_unlock_bh(&session->frwd_lock); 2335 2336 iscsi_suspend_tx(conn); 2337 2338 spin_lock_bh(&session->frwd_lock); 2339 memset(hdr, 0, sizeof(*hdr)); 2340 fail_scsi_tasks(conn, sc->device->lun, DID_ERROR); 2341 conn->tmf_state = TMF_INITIAL; 2342 spin_unlock_bh(&session->frwd_lock); 2343 2344 iscsi_start_tx(conn); 2345 goto done; 2346 2347 unlock: 2348 spin_unlock_bh(&session->frwd_lock); 2349 done: 2350 ISCSI_DBG_EH(session, "dev reset result = %s\n", 2351 rc == SUCCESS ? "SUCCESS" : "FAILED"); 2352 mutex_unlock(&session->eh_mutex); 2353 return rc; 2354 } 2355 EXPORT_SYMBOL_GPL(iscsi_eh_device_reset); 2356 2357 void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session) 2358 { 2359 struct iscsi_session *session = cls_session->dd_data; 2360 2361 spin_lock_bh(&session->frwd_lock); 2362 if (session->state != ISCSI_STATE_LOGGED_IN) { 2363 session->state = ISCSI_STATE_RECOVERY_FAILED; 2364 if (session->leadconn) 2365 wake_up(&session->leadconn->ehwait); 2366 } 2367 spin_unlock_bh(&session->frwd_lock); 2368 } 2369 EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout); 2370 2371 /** 2372 * iscsi_eh_session_reset - drop session and attempt relogin 2373 * @sc: scsi command 2374 * 2375 * This function will wait for a relogin, session termination from 2376 * userspace, or a recovery/replacement timeout. 2377 */ 2378 int iscsi_eh_session_reset(struct scsi_cmnd *sc) 2379 { 2380 struct iscsi_cls_session *cls_session; 2381 struct iscsi_session *session; 2382 struct iscsi_conn *conn; 2383 2384 cls_session = starget_to_session(scsi_target(sc->device)); 2385 session = cls_session->dd_data; 2386 conn = session->leadconn; 2387 2388 mutex_lock(&session->eh_mutex); 2389 spin_lock_bh(&session->frwd_lock); 2390 if (session->state == ISCSI_STATE_TERMINATE) { 2391 failed: 2392 ISCSI_DBG_EH(session, 2393 "failing session reset: Could not log back into " 2394 "%s [age %d]\n", session->targetname, 2395 session->age); 2396 spin_unlock_bh(&session->frwd_lock); 2397 mutex_unlock(&session->eh_mutex); 2398 return FAILED; 2399 } 2400 2401 spin_unlock_bh(&session->frwd_lock); 2402 mutex_unlock(&session->eh_mutex); 2403 /* 2404 * we drop the lock here but the leadconn cannot be destoyed while 2405 * we are in the scsi eh 2406 */ 2407 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); 2408 2409 ISCSI_DBG_EH(session, "wait for relogin\n"); 2410 wait_event_interruptible(conn->ehwait, 2411 session->state == ISCSI_STATE_TERMINATE || 2412 session->state == ISCSI_STATE_LOGGED_IN || 2413 session->state == ISCSI_STATE_RECOVERY_FAILED); 2414 if (signal_pending(current)) 2415 flush_signals(current); 2416 2417 mutex_lock(&session->eh_mutex); 2418 spin_lock_bh(&session->frwd_lock); 2419 if (session->state == ISCSI_STATE_LOGGED_IN) { 2420 ISCSI_DBG_EH(session, 2421 "session reset succeeded for %s,%s\n", 2422 session->targetname, conn->persistent_address); 2423 } else 2424 goto failed; 2425 spin_unlock_bh(&session->frwd_lock); 2426 mutex_unlock(&session->eh_mutex); 2427 return SUCCESS; 2428 } 2429 EXPORT_SYMBOL_GPL(iscsi_eh_session_reset); 2430 2431 static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) 2432 { 2433 memset(hdr, 0, sizeof(*hdr)); 2434 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; 2435 hdr->flags = ISCSI_TM_FUNC_TARGET_WARM_RESET & ISCSI_FLAG_TM_FUNC_MASK; 2436 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2437 hdr->rtt = RESERVED_ITT; 2438 } 2439 2440 /** 2441 * iscsi_eh_target_reset - reset target 2442 * @sc: scsi command 2443 * 2444 * This will attempt to send a warm target reset. 2445 */ 2446 static int iscsi_eh_target_reset(struct scsi_cmnd *sc) 2447 { 2448 struct iscsi_cls_session *cls_session; 2449 struct iscsi_session *session; 2450 struct iscsi_conn *conn; 2451 struct iscsi_tm *hdr; 2452 int rc = FAILED; 2453 2454 cls_session = starget_to_session(scsi_target(sc->device)); 2455 session = cls_session->dd_data; 2456 2457 ISCSI_DBG_EH(session, "tgt Reset [sc %p tgt %s]\n", sc, 2458 session->targetname); 2459 2460 mutex_lock(&session->eh_mutex); 2461 spin_lock_bh(&session->frwd_lock); 2462 /* 2463 * Just check if we are not logged in. We cannot check for 2464 * the phase because the reset could come from a ioctl. 2465 */ 2466 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) 2467 goto unlock; 2468 conn = session->leadconn; 2469 2470 /* only have one tmf outstanding at a time */ 2471 if (conn->tmf_state != TMF_INITIAL) 2472 goto unlock; 2473 conn->tmf_state = TMF_QUEUED; 2474 2475 hdr = &conn->tmhdr; 2476 iscsi_prep_tgt_reset_pdu(sc, hdr); 2477 2478 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, 2479 session->tgt_reset_timeout)) { 2480 rc = FAILED; 2481 goto unlock; 2482 } 2483 2484 switch (conn->tmf_state) { 2485 case TMF_SUCCESS: 2486 break; 2487 case TMF_TIMEDOUT: 2488 spin_unlock_bh(&session->frwd_lock); 2489 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); 2490 goto done; 2491 default: 2492 conn->tmf_state = TMF_INITIAL; 2493 goto unlock; 2494 } 2495 2496 rc = SUCCESS; 2497 spin_unlock_bh(&session->frwd_lock); 2498 2499 iscsi_suspend_tx(conn); 2500 2501 spin_lock_bh(&session->frwd_lock); 2502 memset(hdr, 0, sizeof(*hdr)); 2503 fail_scsi_tasks(conn, -1, DID_ERROR); 2504 conn->tmf_state = TMF_INITIAL; 2505 spin_unlock_bh(&session->frwd_lock); 2506 2507 iscsi_start_tx(conn); 2508 goto done; 2509 2510 unlock: 2511 spin_unlock_bh(&session->frwd_lock); 2512 done: 2513 ISCSI_DBG_EH(session, "tgt %s reset result = %s\n", session->targetname, 2514 rc == SUCCESS ? "SUCCESS" : "FAILED"); 2515 mutex_unlock(&session->eh_mutex); 2516 return rc; 2517 } 2518 2519 /** 2520 * iscsi_eh_recover_target - reset target and possibly the session 2521 * @sc: scsi command 2522 * 2523 * This will attempt to send a warm target reset. If that fails, 2524 * we will escalate to ERL0 session recovery. 2525 */ 2526 int iscsi_eh_recover_target(struct scsi_cmnd *sc) 2527 { 2528 int rc; 2529 2530 rc = iscsi_eh_target_reset(sc); 2531 if (rc == FAILED) 2532 rc = iscsi_eh_session_reset(sc); 2533 return rc; 2534 } 2535 EXPORT_SYMBOL_GPL(iscsi_eh_recover_target); 2536 2537 /* 2538 * Pre-allocate a pool of @max items of @item_size. By default, the pool 2539 * should be accessed via kfifo_{get,put} on q->queue. 2540 * Optionally, the caller can obtain the array of object pointers 2541 * by passing in a non-NULL @items pointer 2542 */ 2543 int 2544 iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size) 2545 { 2546 int i, num_arrays = 1; 2547 2548 memset(q, 0, sizeof(*q)); 2549 2550 q->max = max; 2551 2552 /* If the user passed an items pointer, he wants a copy of 2553 * the array. */ 2554 if (items) 2555 num_arrays++; 2556 q->pool = kvcalloc(num_arrays * max, sizeof(void *), GFP_KERNEL); 2557 if (q->pool == NULL) 2558 return -ENOMEM; 2559 2560 kfifo_init(&q->queue, (void*)q->pool, max * sizeof(void*)); 2561 2562 for (i = 0; i < max; i++) { 2563 q->pool[i] = kzalloc(item_size, GFP_KERNEL); 2564 if (q->pool[i] == NULL) { 2565 q->max = i; 2566 goto enomem; 2567 } 2568 kfifo_in(&q->queue, (void*)&q->pool[i], sizeof(void*)); 2569 } 2570 2571 if (items) { 2572 *items = q->pool + max; 2573 memcpy(*items, q->pool, max * sizeof(void *)); 2574 } 2575 2576 return 0; 2577 2578 enomem: 2579 iscsi_pool_free(q); 2580 return -ENOMEM; 2581 } 2582 EXPORT_SYMBOL_GPL(iscsi_pool_init); 2583 2584 void iscsi_pool_free(struct iscsi_pool *q) 2585 { 2586 int i; 2587 2588 for (i = 0; i < q->max; i++) 2589 kfree(q->pool[i]); 2590 kvfree(q->pool); 2591 } 2592 EXPORT_SYMBOL_GPL(iscsi_pool_free); 2593 2594 /** 2595 * iscsi_host_add - add host to system 2596 * @shost: scsi host 2597 * @pdev: parent device 2598 * 2599 * This should be called by partial offload and software iscsi drivers 2600 * to add a host to the system. 2601 */ 2602 int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev) 2603 { 2604 if (!shost->can_queue) 2605 shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX; 2606 2607 if (!shost->cmd_per_lun) 2608 shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN; 2609 2610 return scsi_add_host(shost, pdev); 2611 } 2612 EXPORT_SYMBOL_GPL(iscsi_host_add); 2613 2614 /** 2615 * iscsi_host_alloc - allocate a host and driver data 2616 * @sht: scsi host template 2617 * @dd_data_size: driver host data size 2618 * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue 2619 * 2620 * This should be called by partial offload and software iscsi drivers. 2621 * To access the driver specific memory use the iscsi_host_priv() macro. 2622 */ 2623 struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht, 2624 int dd_data_size, bool xmit_can_sleep) 2625 { 2626 struct Scsi_Host *shost; 2627 struct iscsi_host *ihost; 2628 2629 shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size); 2630 if (!shost) 2631 return NULL; 2632 ihost = shost_priv(shost); 2633 2634 if (xmit_can_sleep) { 2635 snprintf(ihost->workq_name, sizeof(ihost->workq_name), 2636 "iscsi_q_%d", shost->host_no); 2637 ihost->workq = alloc_workqueue("%s", 2638 WQ_SYSFS | __WQ_LEGACY | WQ_MEM_RECLAIM | WQ_UNBOUND, 2639 1, ihost->workq_name); 2640 if (!ihost->workq) 2641 goto free_host; 2642 } 2643 2644 spin_lock_init(&ihost->lock); 2645 ihost->state = ISCSI_HOST_SETUP; 2646 ihost->num_sessions = 0; 2647 init_waitqueue_head(&ihost->session_removal_wq); 2648 return shost; 2649 2650 free_host: 2651 scsi_host_put(shost); 2652 return NULL; 2653 } 2654 EXPORT_SYMBOL_GPL(iscsi_host_alloc); 2655 2656 static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session) 2657 { 2658 iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST); 2659 } 2660 2661 /** 2662 * iscsi_host_remove - remove host and sessions 2663 * @shost: scsi host 2664 * 2665 * If there are any sessions left, this will initiate the removal and wait 2666 * for the completion. 2667 */ 2668 void iscsi_host_remove(struct Scsi_Host *shost) 2669 { 2670 struct iscsi_host *ihost = shost_priv(shost); 2671 unsigned long flags; 2672 2673 spin_lock_irqsave(&ihost->lock, flags); 2674 ihost->state = ISCSI_HOST_REMOVED; 2675 spin_unlock_irqrestore(&ihost->lock, flags); 2676 2677 iscsi_host_for_each_session(shost, iscsi_notify_host_removed); 2678 wait_event_interruptible(ihost->session_removal_wq, 2679 ihost->num_sessions == 0); 2680 if (signal_pending(current)) 2681 flush_signals(current); 2682 2683 scsi_remove_host(shost); 2684 if (ihost->workq) 2685 destroy_workqueue(ihost->workq); 2686 } 2687 EXPORT_SYMBOL_GPL(iscsi_host_remove); 2688 2689 void iscsi_host_free(struct Scsi_Host *shost) 2690 { 2691 struct iscsi_host *ihost = shost_priv(shost); 2692 2693 kfree(ihost->netdev); 2694 kfree(ihost->hwaddress); 2695 kfree(ihost->initiatorname); 2696 scsi_host_put(shost); 2697 } 2698 EXPORT_SYMBOL_GPL(iscsi_host_free); 2699 2700 static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost) 2701 { 2702 struct iscsi_host *ihost = shost_priv(shost); 2703 unsigned long flags; 2704 2705 shost = scsi_host_get(shost); 2706 if (!shost) { 2707 printk(KERN_ERR "Invalid state. Cannot notify host removal " 2708 "of session teardown event because host already " 2709 "removed.\n"); 2710 return; 2711 } 2712 2713 spin_lock_irqsave(&ihost->lock, flags); 2714 ihost->num_sessions--; 2715 if (ihost->num_sessions == 0) 2716 wake_up(&ihost->session_removal_wq); 2717 spin_unlock_irqrestore(&ihost->lock, flags); 2718 scsi_host_put(shost); 2719 } 2720 2721 /** 2722 * iscsi_session_setup - create iscsi cls session and host and session 2723 * @iscsit: iscsi transport template 2724 * @shost: scsi host 2725 * @cmds_max: session can queue 2726 * @dd_size: private driver data size, added to session allocation size 2727 * @cmd_task_size: LLD task private data size 2728 * @initial_cmdsn: initial CmdSN 2729 * @id: target ID to add to this session 2730 * 2731 * This can be used by software iscsi_transports that allocate 2732 * a session per scsi host. 2733 * 2734 * Callers should set cmds_max to the largest total numer (mgmt + scsi) of 2735 * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks 2736 * for nop handling and login/logout requests. 2737 */ 2738 struct iscsi_cls_session * 2739 iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost, 2740 uint16_t cmds_max, int dd_size, int cmd_task_size, 2741 uint32_t initial_cmdsn, unsigned int id) 2742 { 2743 struct iscsi_host *ihost = shost_priv(shost); 2744 struct iscsi_session *session; 2745 struct iscsi_cls_session *cls_session; 2746 int cmd_i, scsi_cmds, total_cmds = cmds_max; 2747 unsigned long flags; 2748 2749 spin_lock_irqsave(&ihost->lock, flags); 2750 if (ihost->state == ISCSI_HOST_REMOVED) { 2751 spin_unlock_irqrestore(&ihost->lock, flags); 2752 return NULL; 2753 } 2754 ihost->num_sessions++; 2755 spin_unlock_irqrestore(&ihost->lock, flags); 2756 2757 if (!total_cmds) 2758 total_cmds = ISCSI_DEF_XMIT_CMDS_MAX; 2759 /* 2760 * The iscsi layer needs some tasks for nop handling and tmfs, 2761 * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX 2762 * + 1 command for scsi IO. 2763 */ 2764 if (total_cmds < ISCSI_TOTAL_CMDS_MIN) { 2765 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " 2766 "must be a power of two that is at least %d.\n", 2767 total_cmds, ISCSI_TOTAL_CMDS_MIN); 2768 goto dec_session_count; 2769 } 2770 2771 if (total_cmds > ISCSI_TOTAL_CMDS_MAX) { 2772 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " 2773 "must be a power of 2 less than or equal to %d.\n", 2774 cmds_max, ISCSI_TOTAL_CMDS_MAX); 2775 total_cmds = ISCSI_TOTAL_CMDS_MAX; 2776 } 2777 2778 if (!is_power_of_2(total_cmds)) { 2779 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " 2780 "must be a power of 2.\n", total_cmds); 2781 total_cmds = rounddown_pow_of_two(total_cmds); 2782 if (total_cmds < ISCSI_TOTAL_CMDS_MIN) 2783 goto dec_session_count; 2784 printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n", 2785 total_cmds); 2786 } 2787 scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX; 2788 2789 cls_session = iscsi_alloc_session(shost, iscsit, 2790 sizeof(struct iscsi_session) + 2791 dd_size); 2792 if (!cls_session) 2793 goto dec_session_count; 2794 session = cls_session->dd_data; 2795 session->cls_session = cls_session; 2796 session->host = shost; 2797 session->state = ISCSI_STATE_FREE; 2798 session->fast_abort = 1; 2799 session->tgt_reset_timeout = 30; 2800 session->lu_reset_timeout = 15; 2801 session->abort_timeout = 10; 2802 session->scsi_cmds_max = scsi_cmds; 2803 session->cmds_max = total_cmds; 2804 session->queued_cmdsn = session->cmdsn = initial_cmdsn; 2805 session->exp_cmdsn = initial_cmdsn + 1; 2806 session->max_cmdsn = initial_cmdsn + 1; 2807 session->max_r2t = 1; 2808 session->tt = iscsit; 2809 session->dd_data = cls_session->dd_data + sizeof(*session); 2810 2811 mutex_init(&session->eh_mutex); 2812 spin_lock_init(&session->frwd_lock); 2813 spin_lock_init(&session->back_lock); 2814 2815 /* initialize SCSI PDU commands pool */ 2816 if (iscsi_pool_init(&session->cmdpool, session->cmds_max, 2817 (void***)&session->cmds, 2818 cmd_task_size + sizeof(struct iscsi_task))) 2819 goto cmdpool_alloc_fail; 2820 2821 /* pre-format cmds pool with ITT */ 2822 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { 2823 struct iscsi_task *task = session->cmds[cmd_i]; 2824 2825 if (cmd_task_size) 2826 task->dd_data = &task[1]; 2827 task->itt = cmd_i; 2828 task->state = ISCSI_TASK_FREE; 2829 INIT_LIST_HEAD(&task->running); 2830 } 2831 2832 if (!try_module_get(iscsit->owner)) 2833 goto module_get_fail; 2834 2835 if (iscsi_add_session(cls_session, id)) 2836 goto cls_session_fail; 2837 2838 return cls_session; 2839 2840 cls_session_fail: 2841 module_put(iscsit->owner); 2842 module_get_fail: 2843 iscsi_pool_free(&session->cmdpool); 2844 cmdpool_alloc_fail: 2845 iscsi_free_session(cls_session); 2846 dec_session_count: 2847 iscsi_host_dec_session_cnt(shost); 2848 return NULL; 2849 } 2850 EXPORT_SYMBOL_GPL(iscsi_session_setup); 2851 2852 /** 2853 * iscsi_session_teardown - destroy session, host, and cls_session 2854 * @cls_session: iscsi session 2855 */ 2856 void iscsi_session_teardown(struct iscsi_cls_session *cls_session) 2857 { 2858 struct iscsi_session *session = cls_session->dd_data; 2859 struct module *owner = cls_session->transport->owner; 2860 struct Scsi_Host *shost = session->host; 2861 2862 iscsi_pool_free(&session->cmdpool); 2863 2864 iscsi_remove_session(cls_session); 2865 2866 kfree(session->password); 2867 kfree(session->password_in); 2868 kfree(session->username); 2869 kfree(session->username_in); 2870 kfree(session->targetname); 2871 kfree(session->targetalias); 2872 kfree(session->initiatorname); 2873 kfree(session->boot_root); 2874 kfree(session->boot_nic); 2875 kfree(session->boot_target); 2876 kfree(session->ifacename); 2877 kfree(session->portal_type); 2878 kfree(session->discovery_parent_type); 2879 2880 iscsi_free_session(cls_session); 2881 2882 iscsi_host_dec_session_cnt(shost); 2883 module_put(owner); 2884 } 2885 EXPORT_SYMBOL_GPL(iscsi_session_teardown); 2886 2887 /** 2888 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn 2889 * @cls_session: iscsi_cls_session 2890 * @dd_size: private driver data size 2891 * @conn_idx: cid 2892 */ 2893 struct iscsi_cls_conn * 2894 iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size, 2895 uint32_t conn_idx) 2896 { 2897 struct iscsi_session *session = cls_session->dd_data; 2898 struct iscsi_conn *conn; 2899 struct iscsi_cls_conn *cls_conn; 2900 char *data; 2901 2902 cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size, 2903 conn_idx); 2904 if (!cls_conn) 2905 return NULL; 2906 conn = cls_conn->dd_data; 2907 memset(conn, 0, sizeof(*conn) + dd_size); 2908 2909 conn->dd_data = cls_conn->dd_data + sizeof(*conn); 2910 conn->session = session; 2911 conn->cls_conn = cls_conn; 2912 conn->c_stage = ISCSI_CONN_INITIAL_STAGE; 2913 conn->id = conn_idx; 2914 conn->exp_statsn = 0; 2915 conn->tmf_state = TMF_INITIAL; 2916 2917 timer_setup(&conn->transport_timer, iscsi_check_transport_timeouts, 0); 2918 2919 INIT_LIST_HEAD(&conn->mgmtqueue); 2920 INIT_LIST_HEAD(&conn->cmdqueue); 2921 INIT_LIST_HEAD(&conn->requeue); 2922 spin_lock_init(&conn->taskqueuelock); 2923 INIT_WORK(&conn->xmitwork, iscsi_xmitworker); 2924 2925 /* allocate login_task used for the login/text sequences */ 2926 spin_lock_bh(&session->frwd_lock); 2927 if (!kfifo_out(&session->cmdpool.queue, 2928 (void*)&conn->login_task, 2929 sizeof(void*))) { 2930 spin_unlock_bh(&session->frwd_lock); 2931 goto login_task_alloc_fail; 2932 } 2933 spin_unlock_bh(&session->frwd_lock); 2934 2935 data = (char *) __get_free_pages(GFP_KERNEL, 2936 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); 2937 if (!data) 2938 goto login_task_data_alloc_fail; 2939 conn->login_task->data = conn->data = data; 2940 2941 timer_setup(&conn->tmf_timer, iscsi_tmf_timedout, 0); 2942 init_waitqueue_head(&conn->ehwait); 2943 2944 return cls_conn; 2945 2946 login_task_data_alloc_fail: 2947 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task, 2948 sizeof(void*)); 2949 login_task_alloc_fail: 2950 iscsi_destroy_conn(cls_conn); 2951 return NULL; 2952 } 2953 EXPORT_SYMBOL_GPL(iscsi_conn_setup); 2954 2955 /** 2956 * iscsi_conn_teardown - teardown iscsi connection 2957 * @cls_conn: iscsi class connection 2958 * 2959 * TODO: we may need to make this into a two step process 2960 * like scsi-mls remove + put host 2961 */ 2962 void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) 2963 { 2964 struct iscsi_conn *conn = cls_conn->dd_data; 2965 struct iscsi_session *session = conn->session; 2966 2967 del_timer_sync(&conn->transport_timer); 2968 2969 mutex_lock(&session->eh_mutex); 2970 spin_lock_bh(&session->frwd_lock); 2971 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT; 2972 if (session->leadconn == conn) { 2973 /* 2974 * leading connection? then give up on recovery. 2975 */ 2976 session->state = ISCSI_STATE_TERMINATE; 2977 wake_up(&conn->ehwait); 2978 } 2979 spin_unlock_bh(&session->frwd_lock); 2980 2981 /* flush queued up work because we free the connection below */ 2982 iscsi_suspend_tx(conn); 2983 2984 spin_lock_bh(&session->frwd_lock); 2985 free_pages((unsigned long) conn->data, 2986 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); 2987 kfree(conn->persistent_address); 2988 kfree(conn->local_ipaddr); 2989 /* regular RX path uses back_lock */ 2990 spin_lock_bh(&session->back_lock); 2991 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task, 2992 sizeof(void*)); 2993 spin_unlock_bh(&session->back_lock); 2994 if (session->leadconn == conn) 2995 session->leadconn = NULL; 2996 spin_unlock_bh(&session->frwd_lock); 2997 mutex_unlock(&session->eh_mutex); 2998 2999 iscsi_destroy_conn(cls_conn); 3000 } 3001 EXPORT_SYMBOL_GPL(iscsi_conn_teardown); 3002 3003 int iscsi_conn_start(struct iscsi_cls_conn *cls_conn) 3004 { 3005 struct iscsi_conn *conn = cls_conn->dd_data; 3006 struct iscsi_session *session = conn->session; 3007 3008 if (!session) { 3009 iscsi_conn_printk(KERN_ERR, conn, 3010 "can't start unbound connection\n"); 3011 return -EPERM; 3012 } 3013 3014 if ((session->imm_data_en || !session->initial_r2t_en) && 3015 session->first_burst > session->max_burst) { 3016 iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: " 3017 "first_burst %d max_burst %d\n", 3018 session->first_burst, session->max_burst); 3019 return -EINVAL; 3020 } 3021 3022 if (conn->ping_timeout && !conn->recv_timeout) { 3023 iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of " 3024 "zero. Using 5 seconds\n."); 3025 conn->recv_timeout = 5; 3026 } 3027 3028 if (conn->recv_timeout && !conn->ping_timeout) { 3029 iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of " 3030 "zero. Using 5 seconds.\n"); 3031 conn->ping_timeout = 5; 3032 } 3033 3034 spin_lock_bh(&session->frwd_lock); 3035 conn->c_stage = ISCSI_CONN_STARTED; 3036 session->state = ISCSI_STATE_LOGGED_IN; 3037 session->queued_cmdsn = session->cmdsn; 3038 3039 conn->last_recv = jiffies; 3040 conn->last_ping = jiffies; 3041 if (conn->recv_timeout && conn->ping_timeout) 3042 mod_timer(&conn->transport_timer, 3043 jiffies + (conn->recv_timeout * HZ)); 3044 3045 switch(conn->stop_stage) { 3046 case STOP_CONN_RECOVER: 3047 /* 3048 * unblock eh_abort() if it is blocked. re-try all 3049 * commands after successful recovery 3050 */ 3051 conn->stop_stage = 0; 3052 conn->tmf_state = TMF_INITIAL; 3053 session->age++; 3054 if (session->age == 16) 3055 session->age = 0; 3056 break; 3057 case STOP_CONN_TERM: 3058 conn->stop_stage = 0; 3059 break; 3060 default: 3061 break; 3062 } 3063 spin_unlock_bh(&session->frwd_lock); 3064 3065 iscsi_unblock_session(session->cls_session); 3066 wake_up(&conn->ehwait); 3067 return 0; 3068 } 3069 EXPORT_SYMBOL_GPL(iscsi_conn_start); 3070 3071 static void 3072 fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn) 3073 { 3074 struct iscsi_task *task; 3075 int i, state; 3076 3077 for (i = 0; i < conn->session->cmds_max; i++) { 3078 task = conn->session->cmds[i]; 3079 if (task->sc) 3080 continue; 3081 3082 if (task->state == ISCSI_TASK_FREE) 3083 continue; 3084 3085 ISCSI_DBG_SESSION(conn->session, 3086 "failing mgmt itt 0x%x state %d\n", 3087 task->itt, task->state); 3088 state = ISCSI_TASK_ABRT_SESS_RECOV; 3089 if (task->state == ISCSI_TASK_PENDING) 3090 state = ISCSI_TASK_COMPLETED; 3091 spin_lock_bh(&session->back_lock); 3092 iscsi_complete_task(task, state); 3093 spin_unlock_bh(&session->back_lock); 3094 } 3095 } 3096 3097 static void iscsi_start_session_recovery(struct iscsi_session *session, 3098 struct iscsi_conn *conn, int flag) 3099 { 3100 int old_stop_stage; 3101 3102 mutex_lock(&session->eh_mutex); 3103 spin_lock_bh(&session->frwd_lock); 3104 if (conn->stop_stage == STOP_CONN_TERM) { 3105 spin_unlock_bh(&session->frwd_lock); 3106 mutex_unlock(&session->eh_mutex); 3107 return; 3108 } 3109 3110 /* 3111 * When this is called for the in_login state, we only want to clean 3112 * up the login task and connection. We do not need to block and set 3113 * the recovery state again 3114 */ 3115 if (flag == STOP_CONN_TERM) 3116 session->state = ISCSI_STATE_TERMINATE; 3117 else if (conn->stop_stage != STOP_CONN_RECOVER) 3118 session->state = ISCSI_STATE_IN_RECOVERY; 3119 3120 old_stop_stage = conn->stop_stage; 3121 conn->stop_stage = flag; 3122 spin_unlock_bh(&session->frwd_lock); 3123 3124 del_timer_sync(&conn->transport_timer); 3125 iscsi_suspend_tx(conn); 3126 3127 spin_lock_bh(&session->frwd_lock); 3128 conn->c_stage = ISCSI_CONN_STOPPED; 3129 spin_unlock_bh(&session->frwd_lock); 3130 3131 /* 3132 * for connection level recovery we should not calculate 3133 * header digest. conn->hdr_size used for optimization 3134 * in hdr_extract() and will be re-negotiated at 3135 * set_param() time. 3136 */ 3137 if (flag == STOP_CONN_RECOVER) { 3138 conn->hdrdgst_en = 0; 3139 conn->datadgst_en = 0; 3140 if (session->state == ISCSI_STATE_IN_RECOVERY && 3141 old_stop_stage != STOP_CONN_RECOVER) { 3142 ISCSI_DBG_SESSION(session, "blocking session\n"); 3143 iscsi_block_session(session->cls_session); 3144 } 3145 } 3146 3147 /* 3148 * flush queues. 3149 */ 3150 spin_lock_bh(&session->frwd_lock); 3151 fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED); 3152 fail_mgmt_tasks(session, conn); 3153 memset(&conn->tmhdr, 0, sizeof(conn->tmhdr)); 3154 spin_unlock_bh(&session->frwd_lock); 3155 mutex_unlock(&session->eh_mutex); 3156 } 3157 3158 void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) 3159 { 3160 struct iscsi_conn *conn = cls_conn->dd_data; 3161 struct iscsi_session *session = conn->session; 3162 3163 switch (flag) { 3164 case STOP_CONN_RECOVER: 3165 cls_conn->state = ISCSI_CONN_FAILED; 3166 break; 3167 case STOP_CONN_TERM: 3168 cls_conn->state = ISCSI_CONN_DOWN; 3169 break; 3170 default: 3171 iscsi_conn_printk(KERN_ERR, conn, 3172 "invalid stop flag %d\n", flag); 3173 return; 3174 } 3175 3176 iscsi_start_session_recovery(session, conn, flag); 3177 } 3178 EXPORT_SYMBOL_GPL(iscsi_conn_stop); 3179 3180 int iscsi_conn_bind(struct iscsi_cls_session *cls_session, 3181 struct iscsi_cls_conn *cls_conn, int is_leading) 3182 { 3183 struct iscsi_session *session = cls_session->dd_data; 3184 struct iscsi_conn *conn = cls_conn->dd_data; 3185 3186 spin_lock_bh(&session->frwd_lock); 3187 if (is_leading) 3188 session->leadconn = conn; 3189 spin_unlock_bh(&session->frwd_lock); 3190 3191 /* 3192 * Unblock xmitworker(), Login Phase will pass through. 3193 */ 3194 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); 3195 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); 3196 return 0; 3197 } 3198 EXPORT_SYMBOL_GPL(iscsi_conn_bind); 3199 3200 int iscsi_switch_str_param(char **param, char *new_val_buf) 3201 { 3202 char *new_val; 3203 3204 if (*param) { 3205 if (!strcmp(*param, new_val_buf)) 3206 return 0; 3207 } 3208 3209 new_val = kstrdup(new_val_buf, GFP_NOIO); 3210 if (!new_val) 3211 return -ENOMEM; 3212 3213 kfree(*param); 3214 *param = new_val; 3215 return 0; 3216 } 3217 EXPORT_SYMBOL_GPL(iscsi_switch_str_param); 3218 3219 int iscsi_set_param(struct iscsi_cls_conn *cls_conn, 3220 enum iscsi_param param, char *buf, int buflen) 3221 { 3222 struct iscsi_conn *conn = cls_conn->dd_data; 3223 struct iscsi_session *session = conn->session; 3224 int val; 3225 3226 switch(param) { 3227 case ISCSI_PARAM_FAST_ABORT: 3228 sscanf(buf, "%d", &session->fast_abort); 3229 break; 3230 case ISCSI_PARAM_ABORT_TMO: 3231 sscanf(buf, "%d", &session->abort_timeout); 3232 break; 3233 case ISCSI_PARAM_LU_RESET_TMO: 3234 sscanf(buf, "%d", &session->lu_reset_timeout); 3235 break; 3236 case ISCSI_PARAM_TGT_RESET_TMO: 3237 sscanf(buf, "%d", &session->tgt_reset_timeout); 3238 break; 3239 case ISCSI_PARAM_PING_TMO: 3240 sscanf(buf, "%d", &conn->ping_timeout); 3241 break; 3242 case ISCSI_PARAM_RECV_TMO: 3243 sscanf(buf, "%d", &conn->recv_timeout); 3244 break; 3245 case ISCSI_PARAM_MAX_RECV_DLENGTH: 3246 sscanf(buf, "%d", &conn->max_recv_dlength); 3247 break; 3248 case ISCSI_PARAM_MAX_XMIT_DLENGTH: 3249 sscanf(buf, "%d", &conn->max_xmit_dlength); 3250 break; 3251 case ISCSI_PARAM_HDRDGST_EN: 3252 sscanf(buf, "%d", &conn->hdrdgst_en); 3253 break; 3254 case ISCSI_PARAM_DATADGST_EN: 3255 sscanf(buf, "%d", &conn->datadgst_en); 3256 break; 3257 case ISCSI_PARAM_INITIAL_R2T_EN: 3258 sscanf(buf, "%d", &session->initial_r2t_en); 3259 break; 3260 case ISCSI_PARAM_MAX_R2T: 3261 sscanf(buf, "%hu", &session->max_r2t); 3262 break; 3263 case ISCSI_PARAM_IMM_DATA_EN: 3264 sscanf(buf, "%d", &session->imm_data_en); 3265 break; 3266 case ISCSI_PARAM_FIRST_BURST: 3267 sscanf(buf, "%d", &session->first_burst); 3268 break; 3269 case ISCSI_PARAM_MAX_BURST: 3270 sscanf(buf, "%d", &session->max_burst); 3271 break; 3272 case ISCSI_PARAM_PDU_INORDER_EN: 3273 sscanf(buf, "%d", &session->pdu_inorder_en); 3274 break; 3275 case ISCSI_PARAM_DATASEQ_INORDER_EN: 3276 sscanf(buf, "%d", &session->dataseq_inorder_en); 3277 break; 3278 case ISCSI_PARAM_ERL: 3279 sscanf(buf, "%d", &session->erl); 3280 break; 3281 case ISCSI_PARAM_EXP_STATSN: 3282 sscanf(buf, "%u", &conn->exp_statsn); 3283 break; 3284 case ISCSI_PARAM_USERNAME: 3285 return iscsi_switch_str_param(&session->username, buf); 3286 case ISCSI_PARAM_USERNAME_IN: 3287 return iscsi_switch_str_param(&session->username_in, buf); 3288 case ISCSI_PARAM_PASSWORD: 3289 return iscsi_switch_str_param(&session->password, buf); 3290 case ISCSI_PARAM_PASSWORD_IN: 3291 return iscsi_switch_str_param(&session->password_in, buf); 3292 case ISCSI_PARAM_TARGET_NAME: 3293 return iscsi_switch_str_param(&session->targetname, buf); 3294 case ISCSI_PARAM_TARGET_ALIAS: 3295 return iscsi_switch_str_param(&session->targetalias, buf); 3296 case ISCSI_PARAM_TPGT: 3297 sscanf(buf, "%d", &session->tpgt); 3298 break; 3299 case ISCSI_PARAM_PERSISTENT_PORT: 3300 sscanf(buf, "%d", &conn->persistent_port); 3301 break; 3302 case ISCSI_PARAM_PERSISTENT_ADDRESS: 3303 return iscsi_switch_str_param(&conn->persistent_address, buf); 3304 case ISCSI_PARAM_IFACE_NAME: 3305 return iscsi_switch_str_param(&session->ifacename, buf); 3306 case ISCSI_PARAM_INITIATOR_NAME: 3307 return iscsi_switch_str_param(&session->initiatorname, buf); 3308 case ISCSI_PARAM_BOOT_ROOT: 3309 return iscsi_switch_str_param(&session->boot_root, buf); 3310 case ISCSI_PARAM_BOOT_NIC: 3311 return iscsi_switch_str_param(&session->boot_nic, buf); 3312 case ISCSI_PARAM_BOOT_TARGET: 3313 return iscsi_switch_str_param(&session->boot_target, buf); 3314 case ISCSI_PARAM_PORTAL_TYPE: 3315 return iscsi_switch_str_param(&session->portal_type, buf); 3316 case ISCSI_PARAM_DISCOVERY_PARENT_TYPE: 3317 return iscsi_switch_str_param(&session->discovery_parent_type, 3318 buf); 3319 case ISCSI_PARAM_DISCOVERY_SESS: 3320 sscanf(buf, "%d", &val); 3321 session->discovery_sess = !!val; 3322 break; 3323 case ISCSI_PARAM_LOCAL_IPADDR: 3324 return iscsi_switch_str_param(&conn->local_ipaddr, buf); 3325 default: 3326 return -ENOSYS; 3327 } 3328 3329 return 0; 3330 } 3331 EXPORT_SYMBOL_GPL(iscsi_set_param); 3332 3333 int iscsi_session_get_param(struct iscsi_cls_session *cls_session, 3334 enum iscsi_param param, char *buf) 3335 { 3336 struct iscsi_session *session = cls_session->dd_data; 3337 int len; 3338 3339 switch(param) { 3340 case ISCSI_PARAM_FAST_ABORT: 3341 len = sprintf(buf, "%d\n", session->fast_abort); 3342 break; 3343 case ISCSI_PARAM_ABORT_TMO: 3344 len = sprintf(buf, "%d\n", session->abort_timeout); 3345 break; 3346 case ISCSI_PARAM_LU_RESET_TMO: 3347 len = sprintf(buf, "%d\n", session->lu_reset_timeout); 3348 break; 3349 case ISCSI_PARAM_TGT_RESET_TMO: 3350 len = sprintf(buf, "%d\n", session->tgt_reset_timeout); 3351 break; 3352 case ISCSI_PARAM_INITIAL_R2T_EN: 3353 len = sprintf(buf, "%d\n", session->initial_r2t_en); 3354 break; 3355 case ISCSI_PARAM_MAX_R2T: 3356 len = sprintf(buf, "%hu\n", session->max_r2t); 3357 break; 3358 case ISCSI_PARAM_IMM_DATA_EN: 3359 len = sprintf(buf, "%d\n", session->imm_data_en); 3360 break; 3361 case ISCSI_PARAM_FIRST_BURST: 3362 len = sprintf(buf, "%u\n", session->first_burst); 3363 break; 3364 case ISCSI_PARAM_MAX_BURST: 3365 len = sprintf(buf, "%u\n", session->max_burst); 3366 break; 3367 case ISCSI_PARAM_PDU_INORDER_EN: 3368 len = sprintf(buf, "%d\n", session->pdu_inorder_en); 3369 break; 3370 case ISCSI_PARAM_DATASEQ_INORDER_EN: 3371 len = sprintf(buf, "%d\n", session->dataseq_inorder_en); 3372 break; 3373 case ISCSI_PARAM_DEF_TASKMGMT_TMO: 3374 len = sprintf(buf, "%d\n", session->def_taskmgmt_tmo); 3375 break; 3376 case ISCSI_PARAM_ERL: 3377 len = sprintf(buf, "%d\n", session->erl); 3378 break; 3379 case ISCSI_PARAM_TARGET_NAME: 3380 len = sprintf(buf, "%s\n", session->targetname); 3381 break; 3382 case ISCSI_PARAM_TARGET_ALIAS: 3383 len = sprintf(buf, "%s\n", session->targetalias); 3384 break; 3385 case ISCSI_PARAM_TPGT: 3386 len = sprintf(buf, "%d\n", session->tpgt); 3387 break; 3388 case ISCSI_PARAM_USERNAME: 3389 len = sprintf(buf, "%s\n", session->username); 3390 break; 3391 case ISCSI_PARAM_USERNAME_IN: 3392 len = sprintf(buf, "%s\n", session->username_in); 3393 break; 3394 case ISCSI_PARAM_PASSWORD: 3395 len = sprintf(buf, "%s\n", session->password); 3396 break; 3397 case ISCSI_PARAM_PASSWORD_IN: 3398 len = sprintf(buf, "%s\n", session->password_in); 3399 break; 3400 case ISCSI_PARAM_IFACE_NAME: 3401 len = sprintf(buf, "%s\n", session->ifacename); 3402 break; 3403 case ISCSI_PARAM_INITIATOR_NAME: 3404 len = sprintf(buf, "%s\n", session->initiatorname); 3405 break; 3406 case ISCSI_PARAM_BOOT_ROOT: 3407 len = sprintf(buf, "%s\n", session->boot_root); 3408 break; 3409 case ISCSI_PARAM_BOOT_NIC: 3410 len = sprintf(buf, "%s\n", session->boot_nic); 3411 break; 3412 case ISCSI_PARAM_BOOT_TARGET: 3413 len = sprintf(buf, "%s\n", session->boot_target); 3414 break; 3415 case ISCSI_PARAM_AUTO_SND_TGT_DISABLE: 3416 len = sprintf(buf, "%u\n", session->auto_snd_tgt_disable); 3417 break; 3418 case ISCSI_PARAM_DISCOVERY_SESS: 3419 len = sprintf(buf, "%u\n", session->discovery_sess); 3420 break; 3421 case ISCSI_PARAM_PORTAL_TYPE: 3422 len = sprintf(buf, "%s\n", session->portal_type); 3423 break; 3424 case ISCSI_PARAM_CHAP_AUTH_EN: 3425 len = sprintf(buf, "%u\n", session->chap_auth_en); 3426 break; 3427 case ISCSI_PARAM_DISCOVERY_LOGOUT_EN: 3428 len = sprintf(buf, "%u\n", session->discovery_logout_en); 3429 break; 3430 case ISCSI_PARAM_BIDI_CHAP_EN: 3431 len = sprintf(buf, "%u\n", session->bidi_chap_en); 3432 break; 3433 case ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL: 3434 len = sprintf(buf, "%u\n", session->discovery_auth_optional); 3435 break; 3436 case ISCSI_PARAM_DEF_TIME2WAIT: 3437 len = sprintf(buf, "%d\n", session->time2wait); 3438 break; 3439 case ISCSI_PARAM_DEF_TIME2RETAIN: 3440 len = sprintf(buf, "%d\n", session->time2retain); 3441 break; 3442 case ISCSI_PARAM_TSID: 3443 len = sprintf(buf, "%u\n", session->tsid); 3444 break; 3445 case ISCSI_PARAM_ISID: 3446 len = sprintf(buf, "%02x%02x%02x%02x%02x%02x\n", 3447 session->isid[0], session->isid[1], 3448 session->isid[2], session->isid[3], 3449 session->isid[4], session->isid[5]); 3450 break; 3451 case ISCSI_PARAM_DISCOVERY_PARENT_IDX: 3452 len = sprintf(buf, "%u\n", session->discovery_parent_idx); 3453 break; 3454 case ISCSI_PARAM_DISCOVERY_PARENT_TYPE: 3455 if (session->discovery_parent_type) 3456 len = sprintf(buf, "%s\n", 3457 session->discovery_parent_type); 3458 else 3459 len = sprintf(buf, "\n"); 3460 break; 3461 default: 3462 return -ENOSYS; 3463 } 3464 3465 return len; 3466 } 3467 EXPORT_SYMBOL_GPL(iscsi_session_get_param); 3468 3469 int iscsi_conn_get_addr_param(struct sockaddr_storage *addr, 3470 enum iscsi_param param, char *buf) 3471 { 3472 struct sockaddr_in6 *sin6 = NULL; 3473 struct sockaddr_in *sin = NULL; 3474 int len; 3475 3476 switch (addr->ss_family) { 3477 case AF_INET: 3478 sin = (struct sockaddr_in *)addr; 3479 break; 3480 case AF_INET6: 3481 sin6 = (struct sockaddr_in6 *)addr; 3482 break; 3483 default: 3484 return -EINVAL; 3485 } 3486 3487 switch (param) { 3488 case ISCSI_PARAM_CONN_ADDRESS: 3489 case ISCSI_HOST_PARAM_IPADDRESS: 3490 if (sin) 3491 len = sprintf(buf, "%pI4\n", &sin->sin_addr.s_addr); 3492 else 3493 len = sprintf(buf, "%pI6\n", &sin6->sin6_addr); 3494 break; 3495 case ISCSI_PARAM_CONN_PORT: 3496 case ISCSI_PARAM_LOCAL_PORT: 3497 if (sin) 3498 len = sprintf(buf, "%hu\n", be16_to_cpu(sin->sin_port)); 3499 else 3500 len = sprintf(buf, "%hu\n", 3501 be16_to_cpu(sin6->sin6_port)); 3502 break; 3503 default: 3504 return -EINVAL; 3505 } 3506 3507 return len; 3508 } 3509 EXPORT_SYMBOL_GPL(iscsi_conn_get_addr_param); 3510 3511 int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, 3512 enum iscsi_param param, char *buf) 3513 { 3514 struct iscsi_conn *conn = cls_conn->dd_data; 3515 int len; 3516 3517 switch(param) { 3518 case ISCSI_PARAM_PING_TMO: 3519 len = sprintf(buf, "%u\n", conn->ping_timeout); 3520 break; 3521 case ISCSI_PARAM_RECV_TMO: 3522 len = sprintf(buf, "%u\n", conn->recv_timeout); 3523 break; 3524 case ISCSI_PARAM_MAX_RECV_DLENGTH: 3525 len = sprintf(buf, "%u\n", conn->max_recv_dlength); 3526 break; 3527 case ISCSI_PARAM_MAX_XMIT_DLENGTH: 3528 len = sprintf(buf, "%u\n", conn->max_xmit_dlength); 3529 break; 3530 case ISCSI_PARAM_HDRDGST_EN: 3531 len = sprintf(buf, "%d\n", conn->hdrdgst_en); 3532 break; 3533 case ISCSI_PARAM_DATADGST_EN: 3534 len = sprintf(buf, "%d\n", conn->datadgst_en); 3535 break; 3536 case ISCSI_PARAM_IFMARKER_EN: 3537 len = sprintf(buf, "%d\n", conn->ifmarker_en); 3538 break; 3539 case ISCSI_PARAM_OFMARKER_EN: 3540 len = sprintf(buf, "%d\n", conn->ofmarker_en); 3541 break; 3542 case ISCSI_PARAM_EXP_STATSN: 3543 len = sprintf(buf, "%u\n", conn->exp_statsn); 3544 break; 3545 case ISCSI_PARAM_PERSISTENT_PORT: 3546 len = sprintf(buf, "%d\n", conn->persistent_port); 3547 break; 3548 case ISCSI_PARAM_PERSISTENT_ADDRESS: 3549 len = sprintf(buf, "%s\n", conn->persistent_address); 3550 break; 3551 case ISCSI_PARAM_STATSN: 3552 len = sprintf(buf, "%u\n", conn->statsn); 3553 break; 3554 case ISCSI_PARAM_MAX_SEGMENT_SIZE: 3555 len = sprintf(buf, "%u\n", conn->max_segment_size); 3556 break; 3557 case ISCSI_PARAM_KEEPALIVE_TMO: 3558 len = sprintf(buf, "%u\n", conn->keepalive_tmo); 3559 break; 3560 case ISCSI_PARAM_LOCAL_PORT: 3561 len = sprintf(buf, "%u\n", conn->local_port); 3562 break; 3563 case ISCSI_PARAM_TCP_TIMESTAMP_STAT: 3564 len = sprintf(buf, "%u\n", conn->tcp_timestamp_stat); 3565 break; 3566 case ISCSI_PARAM_TCP_NAGLE_DISABLE: 3567 len = sprintf(buf, "%u\n", conn->tcp_nagle_disable); 3568 break; 3569 case ISCSI_PARAM_TCP_WSF_DISABLE: 3570 len = sprintf(buf, "%u\n", conn->tcp_wsf_disable); 3571 break; 3572 case ISCSI_PARAM_TCP_TIMER_SCALE: 3573 len = sprintf(buf, "%u\n", conn->tcp_timer_scale); 3574 break; 3575 case ISCSI_PARAM_TCP_TIMESTAMP_EN: 3576 len = sprintf(buf, "%u\n", conn->tcp_timestamp_en); 3577 break; 3578 case ISCSI_PARAM_IP_FRAGMENT_DISABLE: 3579 len = sprintf(buf, "%u\n", conn->fragment_disable); 3580 break; 3581 case ISCSI_PARAM_IPV4_TOS: 3582 len = sprintf(buf, "%u\n", conn->ipv4_tos); 3583 break; 3584 case ISCSI_PARAM_IPV6_TC: 3585 len = sprintf(buf, "%u\n", conn->ipv6_traffic_class); 3586 break; 3587 case ISCSI_PARAM_IPV6_FLOW_LABEL: 3588 len = sprintf(buf, "%u\n", conn->ipv6_flow_label); 3589 break; 3590 case ISCSI_PARAM_IS_FW_ASSIGNED_IPV6: 3591 len = sprintf(buf, "%u\n", conn->is_fw_assigned_ipv6); 3592 break; 3593 case ISCSI_PARAM_TCP_XMIT_WSF: 3594 len = sprintf(buf, "%u\n", conn->tcp_xmit_wsf); 3595 break; 3596 case ISCSI_PARAM_TCP_RECV_WSF: 3597 len = sprintf(buf, "%u\n", conn->tcp_recv_wsf); 3598 break; 3599 case ISCSI_PARAM_LOCAL_IPADDR: 3600 len = sprintf(buf, "%s\n", conn->local_ipaddr); 3601 break; 3602 default: 3603 return -ENOSYS; 3604 } 3605 3606 return len; 3607 } 3608 EXPORT_SYMBOL_GPL(iscsi_conn_get_param); 3609 3610 int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param, 3611 char *buf) 3612 { 3613 struct iscsi_host *ihost = shost_priv(shost); 3614 int len; 3615 3616 switch (param) { 3617 case ISCSI_HOST_PARAM_NETDEV_NAME: 3618 len = sprintf(buf, "%s\n", ihost->netdev); 3619 break; 3620 case ISCSI_HOST_PARAM_HWADDRESS: 3621 len = sprintf(buf, "%s\n", ihost->hwaddress); 3622 break; 3623 case ISCSI_HOST_PARAM_INITIATOR_NAME: 3624 len = sprintf(buf, "%s\n", ihost->initiatorname); 3625 break; 3626 default: 3627 return -ENOSYS; 3628 } 3629 3630 return len; 3631 } 3632 EXPORT_SYMBOL_GPL(iscsi_host_get_param); 3633 3634 int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param, 3635 char *buf, int buflen) 3636 { 3637 struct iscsi_host *ihost = shost_priv(shost); 3638 3639 switch (param) { 3640 case ISCSI_HOST_PARAM_NETDEV_NAME: 3641 return iscsi_switch_str_param(&ihost->netdev, buf); 3642 case ISCSI_HOST_PARAM_HWADDRESS: 3643 return iscsi_switch_str_param(&ihost->hwaddress, buf); 3644 case ISCSI_HOST_PARAM_INITIATOR_NAME: 3645 return iscsi_switch_str_param(&ihost->initiatorname, buf); 3646 default: 3647 return -ENOSYS; 3648 } 3649 3650 return 0; 3651 } 3652 EXPORT_SYMBOL_GPL(iscsi_host_set_param); 3653 3654 MODULE_AUTHOR("Mike Christie"); 3655 MODULE_DESCRIPTION("iSCSI library functions"); 3656 MODULE_LICENSE("GPL"); 3657