1 /* 2 * iSCSI lib functions 3 * 4 * Copyright (C) 2006 Red Hat, Inc. All rights reserved. 5 * Copyright (C) 2004 - 2006 Mike Christie 6 * Copyright (C) 2004 - 2005 Dmitry Yusupov 7 * Copyright (C) 2004 - 2005 Alex Aizman 8 * maintained by open-iscsi@googlegroups.com 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; if not, write to the Free Software 22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 23 */ 24 #include <linux/types.h> 25 #include <linux/kfifo.h> 26 #include <linux/delay.h> 27 #include <linux/log2.h> 28 #include <linux/slab.h> 29 #include <linux/sched/signal.h> 30 #include <linux/module.h> 31 #include <asm/unaligned.h> 32 #include <net/tcp.h> 33 #include <scsi/scsi_cmnd.h> 34 #include <scsi/scsi_device.h> 35 #include <scsi/scsi_eh.h> 36 #include <scsi/scsi_tcq.h> 37 #include <scsi/scsi_host.h> 38 #include <scsi/scsi.h> 39 #include <scsi/iscsi_proto.h> 40 #include <scsi/scsi_transport.h> 41 #include <scsi/scsi_transport_iscsi.h> 42 #include <scsi/libiscsi.h> 43 44 static int iscsi_dbg_lib_conn; 45 module_param_named(debug_libiscsi_conn, iscsi_dbg_lib_conn, int, 46 S_IRUGO | S_IWUSR); 47 MODULE_PARM_DESC(debug_libiscsi_conn, 48 "Turn on debugging for connections in libiscsi module. " 49 "Set to 1 to turn on, and zero to turn off. Default is off."); 50 51 static int iscsi_dbg_lib_session; 52 module_param_named(debug_libiscsi_session, iscsi_dbg_lib_session, int, 53 S_IRUGO | S_IWUSR); 54 MODULE_PARM_DESC(debug_libiscsi_session, 55 "Turn on debugging for sessions in libiscsi module. " 56 "Set to 1 to turn on, and zero to turn off. Default is off."); 57 58 static int iscsi_dbg_lib_eh; 59 module_param_named(debug_libiscsi_eh, iscsi_dbg_lib_eh, int, 60 S_IRUGO | S_IWUSR); 61 MODULE_PARM_DESC(debug_libiscsi_eh, 62 "Turn on debugging for error handling in libiscsi module. " 63 "Set to 1 to turn on, and zero to turn off. Default is off."); 64 65 #define ISCSI_DBG_CONN(_conn, dbg_fmt, arg...) \ 66 do { \ 67 if (iscsi_dbg_lib_conn) \ 68 iscsi_conn_printk(KERN_INFO, _conn, \ 69 "%s " dbg_fmt, \ 70 __func__, ##arg); \ 71 } while (0); 72 73 #define ISCSI_DBG_SESSION(_session, dbg_fmt, arg...) \ 74 do { \ 75 if (iscsi_dbg_lib_session) \ 76 iscsi_session_printk(KERN_INFO, _session, \ 77 "%s " dbg_fmt, \ 78 __func__, ##arg); \ 79 } while (0); 80 81 #define ISCSI_DBG_EH(_session, dbg_fmt, arg...) \ 82 do { \ 83 if (iscsi_dbg_lib_eh) \ 84 iscsi_session_printk(KERN_INFO, _session, \ 85 "%s " dbg_fmt, \ 86 __func__, ##arg); \ 87 } while (0); 88 89 inline void iscsi_conn_queue_work(struct iscsi_conn *conn) 90 { 91 struct Scsi_Host *shost = conn->session->host; 92 struct iscsi_host *ihost = shost_priv(shost); 93 94 if (ihost->workq) 95 queue_work(ihost->workq, &conn->xmitwork); 96 } 97 EXPORT_SYMBOL_GPL(iscsi_conn_queue_work); 98 99 static void __iscsi_update_cmdsn(struct iscsi_session *session, 100 uint32_t exp_cmdsn, uint32_t max_cmdsn) 101 { 102 /* 103 * standard specifies this check for when to update expected and 104 * max sequence numbers 105 */ 106 if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1)) 107 return; 108 109 if (exp_cmdsn != session->exp_cmdsn && 110 !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn)) 111 session->exp_cmdsn = exp_cmdsn; 112 113 if (max_cmdsn != session->max_cmdsn && 114 !iscsi_sna_lt(max_cmdsn, session->max_cmdsn)) 115 session->max_cmdsn = max_cmdsn; 116 } 117 118 void iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr) 119 { 120 __iscsi_update_cmdsn(session, be32_to_cpu(hdr->exp_cmdsn), 121 be32_to_cpu(hdr->max_cmdsn)); 122 } 123 EXPORT_SYMBOL_GPL(iscsi_update_cmdsn); 124 125 /** 126 * iscsi_prep_data_out_pdu - initialize Data-Out 127 * @task: scsi command task 128 * @r2t: R2T info 129 * @hdr: iscsi data in pdu 130 * 131 * Notes: 132 * Initialize Data-Out within this R2T sequence and finds 133 * proper data_offset within this SCSI command. 134 * 135 * This function is called with connection lock taken. 136 **/ 137 void iscsi_prep_data_out_pdu(struct iscsi_task *task, struct iscsi_r2t_info *r2t, 138 struct iscsi_data *hdr) 139 { 140 struct iscsi_conn *conn = task->conn; 141 unsigned int left = r2t->data_length - r2t->sent; 142 143 task->hdr_len = sizeof(struct iscsi_data); 144 145 memset(hdr, 0, sizeof(struct iscsi_data)); 146 hdr->ttt = r2t->ttt; 147 hdr->datasn = cpu_to_be32(r2t->datasn); 148 r2t->datasn++; 149 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; 150 hdr->lun = task->lun; 151 hdr->itt = task->hdr_itt; 152 hdr->exp_statsn = r2t->exp_statsn; 153 hdr->offset = cpu_to_be32(r2t->data_offset + r2t->sent); 154 if (left > conn->max_xmit_dlength) { 155 hton24(hdr->dlength, conn->max_xmit_dlength); 156 r2t->data_count = conn->max_xmit_dlength; 157 hdr->flags = 0; 158 } else { 159 hton24(hdr->dlength, left); 160 r2t->data_count = left; 161 hdr->flags = ISCSI_FLAG_CMD_FINAL; 162 } 163 conn->dataout_pdus_cnt++; 164 } 165 EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu); 166 167 static int iscsi_add_hdr(struct iscsi_task *task, unsigned len) 168 { 169 unsigned exp_len = task->hdr_len + len; 170 171 if (exp_len > task->hdr_max) { 172 WARN_ON(1); 173 return -EINVAL; 174 } 175 176 WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */ 177 task->hdr_len = exp_len; 178 return 0; 179 } 180 181 /* 182 * make an extended cdb AHS 183 */ 184 static int iscsi_prep_ecdb_ahs(struct iscsi_task *task) 185 { 186 struct scsi_cmnd *cmd = task->sc; 187 unsigned rlen, pad_len; 188 unsigned short ahslength; 189 struct iscsi_ecdb_ahdr *ecdb_ahdr; 190 int rc; 191 192 ecdb_ahdr = iscsi_next_hdr(task); 193 rlen = cmd->cmd_len - ISCSI_CDB_SIZE; 194 195 BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb)); 196 ahslength = rlen + sizeof(ecdb_ahdr->reserved); 197 198 pad_len = iscsi_padding(rlen); 199 200 rc = iscsi_add_hdr(task, sizeof(ecdb_ahdr->ahslength) + 201 sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len); 202 if (rc) 203 return rc; 204 205 if (pad_len) 206 memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len); 207 208 ecdb_ahdr->ahslength = cpu_to_be16(ahslength); 209 ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB; 210 ecdb_ahdr->reserved = 0; 211 memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen); 212 213 ISCSI_DBG_SESSION(task->conn->session, 214 "iscsi_prep_ecdb_ahs: varlen_cdb_len %d " 215 "rlen %d pad_len %d ahs_length %d iscsi_headers_size " 216 "%u\n", cmd->cmd_len, rlen, pad_len, ahslength, 217 task->hdr_len); 218 return 0; 219 } 220 221 static int iscsi_prep_bidi_ahs(struct iscsi_task *task) 222 { 223 struct scsi_cmnd *sc = task->sc; 224 struct iscsi_rlength_ahdr *rlen_ahdr; 225 int rc; 226 227 rlen_ahdr = iscsi_next_hdr(task); 228 rc = iscsi_add_hdr(task, sizeof(*rlen_ahdr)); 229 if (rc) 230 return rc; 231 232 rlen_ahdr->ahslength = 233 cpu_to_be16(sizeof(rlen_ahdr->read_length) + 234 sizeof(rlen_ahdr->reserved)); 235 rlen_ahdr->ahstype = ISCSI_AHSTYPE_RLENGTH; 236 rlen_ahdr->reserved = 0; 237 rlen_ahdr->read_length = cpu_to_be32(scsi_in(sc)->length); 238 239 ISCSI_DBG_SESSION(task->conn->session, 240 "bidi-in rlen_ahdr->read_length(%d) " 241 "rlen_ahdr->ahslength(%d)\n", 242 be32_to_cpu(rlen_ahdr->read_length), 243 be16_to_cpu(rlen_ahdr->ahslength)); 244 return 0; 245 } 246 247 /** 248 * iscsi_check_tmf_restrictions - check if a task is affected by TMF 249 * @task: iscsi task 250 * @opcode: opcode to check for 251 * 252 * During TMF a task has to be checked if it's affected. 253 * All unrelated I/O can be passed through, but I/O to the 254 * affected LUN should be restricted. 255 * If 'fast_abort' is set we won't be sending any I/O to the 256 * affected LUN. 257 * Otherwise the target is waiting for all TTTs to be completed, 258 * so we have to send all outstanding Data-Out PDUs to the target. 259 */ 260 static int iscsi_check_tmf_restrictions(struct iscsi_task *task, int opcode) 261 { 262 struct iscsi_conn *conn = task->conn; 263 struct iscsi_tm *tmf = &conn->tmhdr; 264 u64 hdr_lun; 265 266 if (conn->tmf_state == TMF_INITIAL) 267 return 0; 268 269 if ((tmf->opcode & ISCSI_OPCODE_MASK) != ISCSI_OP_SCSI_TMFUNC) 270 return 0; 271 272 switch (ISCSI_TM_FUNC_VALUE(tmf)) { 273 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 274 /* 275 * Allow PDUs for unrelated LUNs 276 */ 277 hdr_lun = scsilun_to_int(&tmf->lun); 278 if (hdr_lun != task->sc->device->lun) 279 return 0; 280 /* fall through */ 281 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 282 /* 283 * Fail all SCSI cmd PDUs 284 */ 285 if (opcode != ISCSI_OP_SCSI_DATA_OUT) { 286 iscsi_conn_printk(KERN_INFO, conn, 287 "task [op %x/%x itt " 288 "0x%x/0x%x] " 289 "rejected.\n", 290 task->hdr->opcode, opcode, 291 task->itt, task->hdr_itt); 292 return -EACCES; 293 } 294 /* 295 * And also all data-out PDUs in response to R2T 296 * if fast_abort is set. 297 */ 298 if (conn->session->fast_abort) { 299 iscsi_conn_printk(KERN_INFO, conn, 300 "task [op %x/%x itt " 301 "0x%x/0x%x] fast abort.\n", 302 task->hdr->opcode, opcode, 303 task->itt, task->hdr_itt); 304 return -EACCES; 305 } 306 break; 307 case ISCSI_TM_FUNC_ABORT_TASK: 308 /* 309 * the caller has already checked if the task 310 * they want to abort was in the pending queue so if 311 * we are here the cmd pdu has gone out already, and 312 * we will only hit this for data-outs 313 */ 314 if (opcode == ISCSI_OP_SCSI_DATA_OUT && 315 task->hdr_itt == tmf->rtt) { 316 ISCSI_DBG_SESSION(conn->session, 317 "Preventing task %x/%x from sending " 318 "data-out due to abort task in " 319 "progress\n", task->itt, 320 task->hdr_itt); 321 return -EACCES; 322 } 323 break; 324 } 325 326 return 0; 327 } 328 329 /** 330 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu 331 * @task: iscsi task 332 * 333 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set 334 * fields like dlength or final based on how much data it sends 335 */ 336 static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task) 337 { 338 struct iscsi_conn *conn = task->conn; 339 struct iscsi_session *session = conn->session; 340 struct scsi_cmnd *sc = task->sc; 341 struct iscsi_scsi_req *hdr; 342 unsigned hdrlength, cmd_len, transfer_length; 343 itt_t itt; 344 int rc; 345 346 rc = iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_CMD); 347 if (rc) 348 return rc; 349 350 if (conn->session->tt->alloc_pdu) { 351 rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_CMD); 352 if (rc) 353 return rc; 354 } 355 hdr = (struct iscsi_scsi_req *)task->hdr; 356 itt = hdr->itt; 357 memset(hdr, 0, sizeof(*hdr)); 358 359 if (session->tt->parse_pdu_itt) 360 hdr->itt = task->hdr_itt = itt; 361 else 362 hdr->itt = task->hdr_itt = build_itt(task->itt, 363 task->conn->session->age); 364 task->hdr_len = 0; 365 rc = iscsi_add_hdr(task, sizeof(*hdr)); 366 if (rc) 367 return rc; 368 hdr->opcode = ISCSI_OP_SCSI_CMD; 369 hdr->flags = ISCSI_ATTR_SIMPLE; 370 int_to_scsilun(sc->device->lun, &hdr->lun); 371 task->lun = hdr->lun; 372 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); 373 cmd_len = sc->cmd_len; 374 if (cmd_len < ISCSI_CDB_SIZE) 375 memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len); 376 else if (cmd_len > ISCSI_CDB_SIZE) { 377 rc = iscsi_prep_ecdb_ahs(task); 378 if (rc) 379 return rc; 380 cmd_len = ISCSI_CDB_SIZE; 381 } 382 memcpy(hdr->cdb, sc->cmnd, cmd_len); 383 384 task->imm_count = 0; 385 if (scsi_bidi_cmnd(sc)) { 386 hdr->flags |= ISCSI_FLAG_CMD_READ; 387 rc = iscsi_prep_bidi_ahs(task); 388 if (rc) 389 return rc; 390 } 391 392 if (scsi_get_prot_op(sc) != SCSI_PROT_NORMAL) 393 task->protected = true; 394 395 transfer_length = scsi_transfer_length(sc); 396 hdr->data_length = cpu_to_be32(transfer_length); 397 if (sc->sc_data_direction == DMA_TO_DEVICE) { 398 struct iscsi_r2t_info *r2t = &task->unsol_r2t; 399 400 hdr->flags |= ISCSI_FLAG_CMD_WRITE; 401 /* 402 * Write counters: 403 * 404 * imm_count bytes to be sent right after 405 * SCSI PDU Header 406 * 407 * unsol_count bytes(as Data-Out) to be sent 408 * without R2T ack right after 409 * immediate data 410 * 411 * r2t data_length bytes to be sent via R2T ack's 412 * 413 * pad_count bytes to be sent as zero-padding 414 */ 415 memset(r2t, 0, sizeof(*r2t)); 416 417 if (session->imm_data_en) { 418 if (transfer_length >= session->first_burst) 419 task->imm_count = min(session->first_burst, 420 conn->max_xmit_dlength); 421 else 422 task->imm_count = min(transfer_length, 423 conn->max_xmit_dlength); 424 hton24(hdr->dlength, task->imm_count); 425 } else 426 zero_data(hdr->dlength); 427 428 if (!session->initial_r2t_en) { 429 r2t->data_length = min(session->first_burst, 430 transfer_length) - 431 task->imm_count; 432 r2t->data_offset = task->imm_count; 433 r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG); 434 r2t->exp_statsn = cpu_to_be32(conn->exp_statsn); 435 } 436 437 if (!task->unsol_r2t.data_length) 438 /* No unsolicit Data-Out's */ 439 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 440 } else { 441 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 442 zero_data(hdr->dlength); 443 444 if (sc->sc_data_direction == DMA_FROM_DEVICE) 445 hdr->flags |= ISCSI_FLAG_CMD_READ; 446 } 447 448 /* calculate size of additional header segments (AHSs) */ 449 hdrlength = task->hdr_len - sizeof(*hdr); 450 451 WARN_ON(hdrlength & (ISCSI_PAD_LEN-1)); 452 hdrlength /= ISCSI_PAD_LEN; 453 454 WARN_ON(hdrlength >= 256); 455 hdr->hlength = hdrlength & 0xFF; 456 hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn); 457 458 if (session->tt->init_task && session->tt->init_task(task)) 459 return -EIO; 460 461 task->state = ISCSI_TASK_RUNNING; 462 session->cmdsn++; 463 464 conn->scsicmd_pdus_cnt++; 465 ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x " 466 "itt 0x%x len %d bidi_len %d cmdsn %d win %d]\n", 467 scsi_bidi_cmnd(sc) ? "bidirectional" : 468 sc->sc_data_direction == DMA_TO_DEVICE ? 469 "write" : "read", conn->id, sc, sc->cmnd[0], 470 task->itt, transfer_length, 471 scsi_bidi_cmnd(sc) ? scsi_in(sc)->length : 0, 472 session->cmdsn, 473 session->max_cmdsn - session->exp_cmdsn + 1); 474 return 0; 475 } 476 477 /** 478 * iscsi_free_task - free a task 479 * @task: iscsi cmd task 480 * 481 * Must be called with session back_lock. 482 * This function returns the scsi command to scsi-ml or cleans 483 * up mgmt tasks then returns the task to the pool. 484 */ 485 static void iscsi_free_task(struct iscsi_task *task) 486 { 487 struct iscsi_conn *conn = task->conn; 488 struct iscsi_session *session = conn->session; 489 struct scsi_cmnd *sc = task->sc; 490 int oldstate = task->state; 491 492 ISCSI_DBG_SESSION(session, "freeing task itt 0x%x state %d sc %p\n", 493 task->itt, task->state, task->sc); 494 495 session->tt->cleanup_task(task); 496 task->state = ISCSI_TASK_FREE; 497 task->sc = NULL; 498 /* 499 * login task is preallocated so do not free 500 */ 501 if (conn->login_task == task) 502 return; 503 504 kfifo_in(&session->cmdpool.queue, (void*)&task, sizeof(void*)); 505 506 if (sc) { 507 /* SCSI eh reuses commands to verify us */ 508 sc->SCp.ptr = NULL; 509 /* 510 * queue command may call this to free the task, so 511 * it will decide how to return sc to scsi-ml. 512 */ 513 if (oldstate != ISCSI_TASK_REQUEUE_SCSIQ) 514 sc->scsi_done(sc); 515 } 516 } 517 518 void __iscsi_get_task(struct iscsi_task *task) 519 { 520 atomic_inc(&task->refcount); 521 } 522 EXPORT_SYMBOL_GPL(__iscsi_get_task); 523 524 void __iscsi_put_task(struct iscsi_task *task) 525 { 526 if (atomic_dec_and_test(&task->refcount)) 527 iscsi_free_task(task); 528 } 529 EXPORT_SYMBOL_GPL(__iscsi_put_task); 530 531 void iscsi_put_task(struct iscsi_task *task) 532 { 533 struct iscsi_session *session = task->conn->session; 534 535 /* regular RX path uses back_lock */ 536 spin_lock_bh(&session->back_lock); 537 __iscsi_put_task(task); 538 spin_unlock_bh(&session->back_lock); 539 } 540 EXPORT_SYMBOL_GPL(iscsi_put_task); 541 542 /** 543 * iscsi_complete_task - finish a task 544 * @task: iscsi cmd task 545 * @state: state to complete task with 546 * 547 * Must be called with session back_lock. 548 */ 549 static void iscsi_complete_task(struct iscsi_task *task, int state) 550 { 551 struct iscsi_conn *conn = task->conn; 552 553 ISCSI_DBG_SESSION(conn->session, 554 "complete task itt 0x%x state %d sc %p\n", 555 task->itt, task->state, task->sc); 556 if (task->state == ISCSI_TASK_COMPLETED || 557 task->state == ISCSI_TASK_ABRT_TMF || 558 task->state == ISCSI_TASK_ABRT_SESS_RECOV || 559 task->state == ISCSI_TASK_REQUEUE_SCSIQ) 560 return; 561 WARN_ON_ONCE(task->state == ISCSI_TASK_FREE); 562 task->state = state; 563 564 if (!list_empty(&task->running)) 565 list_del_init(&task->running); 566 567 if (conn->task == task) 568 conn->task = NULL; 569 570 if (conn->ping_task == task) 571 conn->ping_task = NULL; 572 573 /* release get from queueing */ 574 __iscsi_put_task(task); 575 } 576 577 /** 578 * iscsi_complete_scsi_task - finish scsi task normally 579 * @task: iscsi task for scsi cmd 580 * @exp_cmdsn: expected cmd sn in cpu format 581 * @max_cmdsn: max cmd sn in cpu format 582 * 583 * This is used when drivers do not need or cannot perform 584 * lower level pdu processing. 585 * 586 * Called with session back_lock 587 */ 588 void iscsi_complete_scsi_task(struct iscsi_task *task, 589 uint32_t exp_cmdsn, uint32_t max_cmdsn) 590 { 591 struct iscsi_conn *conn = task->conn; 592 593 ISCSI_DBG_SESSION(conn->session, "[itt 0x%x]\n", task->itt); 594 595 conn->last_recv = jiffies; 596 __iscsi_update_cmdsn(conn->session, exp_cmdsn, max_cmdsn); 597 iscsi_complete_task(task, ISCSI_TASK_COMPLETED); 598 } 599 EXPORT_SYMBOL_GPL(iscsi_complete_scsi_task); 600 601 602 /* 603 * session back_lock must be held and if not called for a task that is 604 * still pending or from the xmit thread, then xmit thread must 605 * be suspended. 606 */ 607 static void fail_scsi_task(struct iscsi_task *task, int err) 608 { 609 struct iscsi_conn *conn = task->conn; 610 struct scsi_cmnd *sc; 611 int state; 612 613 /* 614 * if a command completes and we get a successful tmf response 615 * we will hit this because the scsi eh abort code does not take 616 * a ref to the task. 617 */ 618 sc = task->sc; 619 if (!sc) 620 return; 621 622 if (task->state == ISCSI_TASK_PENDING) { 623 /* 624 * cmd never made it to the xmit thread, so we should not count 625 * the cmd in the sequencing 626 */ 627 conn->session->queued_cmdsn--; 628 /* it was never sent so just complete like normal */ 629 state = ISCSI_TASK_COMPLETED; 630 } else if (err == DID_TRANSPORT_DISRUPTED) 631 state = ISCSI_TASK_ABRT_SESS_RECOV; 632 else 633 state = ISCSI_TASK_ABRT_TMF; 634 635 sc->result = err << 16; 636 if (!scsi_bidi_cmnd(sc)) 637 scsi_set_resid(sc, scsi_bufflen(sc)); 638 else { 639 scsi_out(sc)->resid = scsi_out(sc)->length; 640 scsi_in(sc)->resid = scsi_in(sc)->length; 641 } 642 643 /* regular RX path uses back_lock */ 644 spin_lock_bh(&conn->session->back_lock); 645 iscsi_complete_task(task, state); 646 spin_unlock_bh(&conn->session->back_lock); 647 } 648 649 static int iscsi_prep_mgmt_task(struct iscsi_conn *conn, 650 struct iscsi_task *task) 651 { 652 struct iscsi_session *session = conn->session; 653 struct iscsi_hdr *hdr = task->hdr; 654 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr; 655 uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK; 656 657 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) 658 return -ENOTCONN; 659 660 if (opcode != ISCSI_OP_LOGIN && opcode != ISCSI_OP_TEXT) 661 nop->exp_statsn = cpu_to_be32(conn->exp_statsn); 662 /* 663 * pre-format CmdSN for outgoing PDU. 664 */ 665 nop->cmdsn = cpu_to_be32(session->cmdsn); 666 if (hdr->itt != RESERVED_ITT) { 667 /* 668 * TODO: We always use immediate for normal session pdus. 669 * If we start to send tmfs or nops as non-immediate then 670 * we should start checking the cmdsn numbers for mgmt tasks. 671 * 672 * During discovery sessions iscsid sends TEXT as non immediate, 673 * but we always only send one PDU at a time. 674 */ 675 if (conn->c_stage == ISCSI_CONN_STARTED && 676 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 677 session->queued_cmdsn++; 678 session->cmdsn++; 679 } 680 } 681 682 if (session->tt->init_task && session->tt->init_task(task)) 683 return -EIO; 684 685 if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT) 686 session->state = ISCSI_STATE_LOGGING_OUT; 687 688 task->state = ISCSI_TASK_RUNNING; 689 ISCSI_DBG_SESSION(session, "mgmtpdu [op 0x%x hdr->itt 0x%x " 690 "datalen %d]\n", hdr->opcode & ISCSI_OPCODE_MASK, 691 hdr->itt, task->data_count); 692 return 0; 693 } 694 695 static struct iscsi_task * 696 __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 697 char *data, uint32_t data_size) 698 { 699 struct iscsi_session *session = conn->session; 700 struct iscsi_host *ihost = shost_priv(session->host); 701 uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK; 702 struct iscsi_task *task; 703 itt_t itt; 704 705 if (session->state == ISCSI_STATE_TERMINATE) 706 return NULL; 707 708 if (opcode == ISCSI_OP_LOGIN || opcode == ISCSI_OP_TEXT) { 709 /* 710 * Login and Text are sent serially, in 711 * request-followed-by-response sequence. 712 * Same task can be used. Same ITT must be used. 713 * Note that login_task is preallocated at conn_create(). 714 */ 715 if (conn->login_task->state != ISCSI_TASK_FREE) { 716 iscsi_conn_printk(KERN_ERR, conn, "Login/Text in " 717 "progress. Cannot start new task.\n"); 718 return NULL; 719 } 720 721 if (data_size > ISCSI_DEF_MAX_RECV_SEG_LEN) { 722 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); 723 return NULL; 724 } 725 726 task = conn->login_task; 727 } else { 728 if (session->state != ISCSI_STATE_LOGGED_IN) 729 return NULL; 730 731 if (data_size != 0) { 732 iscsi_conn_printk(KERN_ERR, conn, "Can not send data buffer of len %u for op 0x%x\n", data_size, opcode); 733 return NULL; 734 } 735 736 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE); 737 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED); 738 739 if (!kfifo_out(&session->cmdpool.queue, 740 (void*)&task, sizeof(void*))) 741 return NULL; 742 } 743 /* 744 * released in complete pdu for task we expect a response for, and 745 * released by the lld when it has transmitted the task for 746 * pdus we do not expect a response for. 747 */ 748 atomic_set(&task->refcount, 1); 749 task->conn = conn; 750 task->sc = NULL; 751 INIT_LIST_HEAD(&task->running); 752 task->state = ISCSI_TASK_PENDING; 753 754 if (data_size) { 755 memcpy(task->data, data, data_size); 756 task->data_count = data_size; 757 } else 758 task->data_count = 0; 759 760 if (conn->session->tt->alloc_pdu) { 761 if (conn->session->tt->alloc_pdu(task, hdr->opcode)) { 762 iscsi_conn_printk(KERN_ERR, conn, "Could not allocate " 763 "pdu for mgmt task.\n"); 764 goto free_task; 765 } 766 } 767 768 itt = task->hdr->itt; 769 task->hdr_len = sizeof(struct iscsi_hdr); 770 memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr)); 771 772 if (hdr->itt != RESERVED_ITT) { 773 if (session->tt->parse_pdu_itt) 774 task->hdr->itt = itt; 775 else 776 task->hdr->itt = build_itt(task->itt, 777 task->conn->session->age); 778 } 779 780 if (!ihost->workq) { 781 if (iscsi_prep_mgmt_task(conn, task)) 782 goto free_task; 783 784 if (session->tt->xmit_task(task)) 785 goto free_task; 786 } else { 787 list_add_tail(&task->running, &conn->mgmtqueue); 788 iscsi_conn_queue_work(conn); 789 } 790 791 return task; 792 793 free_task: 794 /* regular RX path uses back_lock */ 795 spin_lock(&session->back_lock); 796 __iscsi_put_task(task); 797 spin_unlock(&session->back_lock); 798 return NULL; 799 } 800 801 int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr, 802 char *data, uint32_t data_size) 803 { 804 struct iscsi_conn *conn = cls_conn->dd_data; 805 struct iscsi_session *session = conn->session; 806 int err = 0; 807 808 spin_lock_bh(&session->frwd_lock); 809 if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size)) 810 err = -EPERM; 811 spin_unlock_bh(&session->frwd_lock); 812 return err; 813 } 814 EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu); 815 816 /** 817 * iscsi_cmd_rsp - SCSI Command Response processing 818 * @conn: iscsi connection 819 * @hdr: iscsi header 820 * @task: scsi command task 821 * @data: cmd data buffer 822 * @datalen: len of buffer 823 * 824 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and 825 * then completes the command and task. 826 **/ 827 static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 828 struct iscsi_task *task, char *data, 829 int datalen) 830 { 831 struct iscsi_scsi_rsp *rhdr = (struct iscsi_scsi_rsp *)hdr; 832 struct iscsi_session *session = conn->session; 833 struct scsi_cmnd *sc = task->sc; 834 835 iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); 836 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; 837 838 sc->result = (DID_OK << 16) | rhdr->cmd_status; 839 840 if (task->protected) { 841 sector_t sector; 842 u8 ascq; 843 844 /** 845 * Transports that didn't implement check_protection 846 * callback but still published T10-PI support to scsi-mid 847 * deserve this BUG_ON. 848 **/ 849 BUG_ON(!session->tt->check_protection); 850 851 ascq = session->tt->check_protection(task, §or); 852 if (ascq) { 853 sc->result = DRIVER_SENSE << 24 | 854 SAM_STAT_CHECK_CONDITION; 855 scsi_build_sense_buffer(1, sc->sense_buffer, 856 ILLEGAL_REQUEST, 0x10, ascq); 857 scsi_set_sense_information(sc->sense_buffer, 858 SCSI_SENSE_BUFFERSIZE, 859 sector); 860 goto out; 861 } 862 } 863 864 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) { 865 sc->result = DID_ERROR << 16; 866 goto out; 867 } 868 869 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) { 870 uint16_t senselen; 871 872 if (datalen < 2) { 873 invalid_datalen: 874 iscsi_conn_printk(KERN_ERR, conn, 875 "Got CHECK_CONDITION but invalid data " 876 "buffer size of %d\n", datalen); 877 sc->result = DID_BAD_TARGET << 16; 878 goto out; 879 } 880 881 senselen = get_unaligned_be16(data); 882 if (datalen < senselen) 883 goto invalid_datalen; 884 885 memcpy(sc->sense_buffer, data + 2, 886 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); 887 ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n", 888 min_t(uint16_t, senselen, 889 SCSI_SENSE_BUFFERSIZE)); 890 } 891 892 if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW | 893 ISCSI_FLAG_CMD_BIDI_OVERFLOW)) { 894 int res_count = be32_to_cpu(rhdr->bi_residual_count); 895 896 if (scsi_bidi_cmnd(sc) && res_count > 0 && 897 (rhdr->flags & ISCSI_FLAG_CMD_BIDI_OVERFLOW || 898 res_count <= scsi_in(sc)->length)) 899 scsi_in(sc)->resid = res_count; 900 else 901 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; 902 } 903 904 if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW | 905 ISCSI_FLAG_CMD_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 <= scsi_bufflen(sc))) 911 /* write side for bidi or uni-io set_resid */ 912 scsi_set_resid(sc, res_count); 913 else 914 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; 915 } 916 out: 917 ISCSI_DBG_SESSION(session, "cmd rsp done [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 /** 924 * iscsi_data_in_rsp - SCSI Data-In Response processing 925 * @conn: iscsi connection 926 * @hdr: iscsi pdu 927 * @task: scsi command task 928 **/ 929 static void 930 iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 931 struct iscsi_task *task) 932 { 933 struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr; 934 struct scsi_cmnd *sc = task->sc; 935 936 if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS)) 937 return; 938 939 iscsi_update_cmdsn(conn->session, (struct iscsi_nopin *)hdr); 940 sc->result = (DID_OK << 16) | rhdr->cmd_status; 941 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; 942 if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW | 943 ISCSI_FLAG_DATA_OVERFLOW)) { 944 int res_count = be32_to_cpu(rhdr->residual_count); 945 946 if (res_count > 0 && 947 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || 948 res_count <= scsi_in(sc)->length)) 949 scsi_in(sc)->resid = res_count; 950 else 951 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; 952 } 953 954 ISCSI_DBG_SESSION(conn->session, "data in with status done " 955 "[sc %p res %d itt 0x%x]\n", 956 sc, sc->result, task->itt); 957 conn->scsirsp_pdus_cnt++; 958 iscsi_complete_task(task, ISCSI_TASK_COMPLETED); 959 } 960 961 static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr) 962 { 963 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr; 964 965 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; 966 conn->tmfrsp_pdus_cnt++; 967 968 if (conn->tmf_state != TMF_QUEUED) 969 return; 970 971 if (tmf->response == ISCSI_TMF_RSP_COMPLETE) 972 conn->tmf_state = TMF_SUCCESS; 973 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK) 974 conn->tmf_state = TMF_NOT_FOUND; 975 else 976 conn->tmf_state = TMF_FAILED; 977 wake_up(&conn->ehwait); 978 } 979 980 static int iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr) 981 { 982 struct iscsi_nopout hdr; 983 struct iscsi_task *task; 984 985 if (!rhdr && conn->ping_task) 986 return -EINVAL; 987 988 memset(&hdr, 0, sizeof(struct iscsi_nopout)); 989 hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE; 990 hdr.flags = ISCSI_FLAG_CMD_FINAL; 991 992 if (rhdr) { 993 hdr.lun = rhdr->lun; 994 hdr.ttt = rhdr->ttt; 995 hdr.itt = RESERVED_ITT; 996 } else 997 hdr.ttt = RESERVED_ITT; 998 999 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0); 1000 if (!task) { 1001 iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n"); 1002 return -EIO; 1003 } else if (!rhdr) { 1004 /* only track our nops */ 1005 conn->ping_task = task; 1006 conn->last_ping = jiffies; 1007 } 1008 1009 return 0; 1010 } 1011 1012 static int iscsi_nop_out_rsp(struct iscsi_task *task, 1013 struct iscsi_nopin *nop, char *data, int datalen) 1014 { 1015 struct iscsi_conn *conn = task->conn; 1016 int rc = 0; 1017 1018 if (conn->ping_task != task) { 1019 /* 1020 * If this is not in response to one of our 1021 * nops then it must be from userspace. 1022 */ 1023 if (iscsi_recv_pdu(conn->cls_conn, (struct iscsi_hdr *)nop, 1024 data, datalen)) 1025 rc = ISCSI_ERR_CONN_FAILED; 1026 } else 1027 mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout); 1028 iscsi_complete_task(task, ISCSI_TASK_COMPLETED); 1029 return rc; 1030 } 1031 1032 static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 1033 char *data, int datalen) 1034 { 1035 struct iscsi_reject *reject = (struct iscsi_reject *)hdr; 1036 struct iscsi_hdr rejected_pdu; 1037 int opcode, rc = 0; 1038 1039 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1; 1040 1041 if (ntoh24(reject->dlength) > datalen || 1042 ntoh24(reject->dlength) < sizeof(struct iscsi_hdr)) { 1043 iscsi_conn_printk(KERN_ERR, conn, "Cannot handle rejected " 1044 "pdu. Invalid data length (pdu dlength " 1045 "%u, datalen %d\n", ntoh24(reject->dlength), 1046 datalen); 1047 return ISCSI_ERR_PROTO; 1048 } 1049 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr)); 1050 opcode = rejected_pdu.opcode & ISCSI_OPCODE_MASK; 1051 1052 switch (reject->reason) { 1053 case ISCSI_REASON_DATA_DIGEST_ERROR: 1054 iscsi_conn_printk(KERN_ERR, conn, 1055 "pdu (op 0x%x itt 0x%x) rejected " 1056 "due to DataDigest error.\n", 1057 opcode, rejected_pdu.itt); 1058 break; 1059 case ISCSI_REASON_IMM_CMD_REJECT: 1060 iscsi_conn_printk(KERN_ERR, conn, 1061 "pdu (op 0x%x itt 0x%x) rejected. Too many " 1062 "immediate commands.\n", 1063 opcode, rejected_pdu.itt); 1064 /* 1065 * We only send one TMF at a time so if the target could not 1066 * handle it, then it should get fixed (RFC mandates that 1067 * a target can handle one immediate TMF per conn). 1068 * 1069 * For nops-outs, we could have sent more than one if 1070 * the target is sending us lots of nop-ins 1071 */ 1072 if (opcode != ISCSI_OP_NOOP_OUT) 1073 return 0; 1074 1075 if (rejected_pdu.itt == cpu_to_be32(ISCSI_RESERVED_TAG)) { 1076 /* 1077 * nop-out in response to target's nop-out rejected. 1078 * Just resend. 1079 */ 1080 /* In RX path we are under back lock */ 1081 spin_unlock(&conn->session->back_lock); 1082 spin_lock(&conn->session->frwd_lock); 1083 iscsi_send_nopout(conn, 1084 (struct iscsi_nopin*)&rejected_pdu); 1085 spin_unlock(&conn->session->frwd_lock); 1086 spin_lock(&conn->session->back_lock); 1087 } else { 1088 struct iscsi_task *task; 1089 /* 1090 * Our nop as ping got dropped. We know the target 1091 * and transport are ok so just clean up 1092 */ 1093 task = iscsi_itt_to_task(conn, rejected_pdu.itt); 1094 if (!task) { 1095 iscsi_conn_printk(KERN_ERR, conn, 1096 "Invalid pdu reject. Could " 1097 "not lookup rejected task.\n"); 1098 rc = ISCSI_ERR_BAD_ITT; 1099 } else 1100 rc = iscsi_nop_out_rsp(task, 1101 (struct iscsi_nopin*)&rejected_pdu, 1102 NULL, 0); 1103 } 1104 break; 1105 default: 1106 iscsi_conn_printk(KERN_ERR, conn, 1107 "pdu (op 0x%x itt 0x%x) rejected. Reason " 1108 "code 0x%x\n", rejected_pdu.opcode, 1109 rejected_pdu.itt, reject->reason); 1110 break; 1111 } 1112 return rc; 1113 } 1114 1115 /** 1116 * iscsi_itt_to_task - look up task by itt 1117 * @conn: iscsi connection 1118 * @itt: itt 1119 * 1120 * This should be used for mgmt tasks like login and nops, or if 1121 * the LDD's itt space does not include the session age. 1122 * 1123 * The session back_lock must be held. 1124 */ 1125 struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt) 1126 { 1127 struct iscsi_session *session = conn->session; 1128 int i; 1129 1130 if (itt == RESERVED_ITT) 1131 return NULL; 1132 1133 if (session->tt->parse_pdu_itt) 1134 session->tt->parse_pdu_itt(conn, itt, &i, NULL); 1135 else 1136 i = get_itt(itt); 1137 if (i >= session->cmds_max) 1138 return NULL; 1139 1140 return session->cmds[i]; 1141 } 1142 EXPORT_SYMBOL_GPL(iscsi_itt_to_task); 1143 1144 /** 1145 * __iscsi_complete_pdu - complete pdu 1146 * @conn: iscsi conn 1147 * @hdr: iscsi header 1148 * @data: data buffer 1149 * @datalen: len of data buffer 1150 * 1151 * Completes pdu processing by freeing any resources allocated at 1152 * queuecommand or send generic. session back_lock must be held and verify 1153 * itt must have been called. 1154 */ 1155 int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 1156 char *data, int datalen) 1157 { 1158 struct iscsi_session *session = conn->session; 1159 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0; 1160 struct iscsi_task *task; 1161 uint32_t itt; 1162 1163 conn->last_recv = jiffies; 1164 rc = iscsi_verify_itt(conn, hdr->itt); 1165 if (rc) 1166 return rc; 1167 1168 if (hdr->itt != RESERVED_ITT) 1169 itt = get_itt(hdr->itt); 1170 else 1171 itt = ~0U; 1172 1173 ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n", 1174 opcode, conn->id, itt, datalen); 1175 1176 if (itt == ~0U) { 1177 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); 1178 1179 switch(opcode) { 1180 case ISCSI_OP_NOOP_IN: 1181 if (datalen) { 1182 rc = ISCSI_ERR_PROTO; 1183 break; 1184 } 1185 1186 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG)) 1187 break; 1188 1189 /* In RX path we are under back lock */ 1190 spin_unlock(&session->back_lock); 1191 spin_lock(&session->frwd_lock); 1192 iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr); 1193 spin_unlock(&session->frwd_lock); 1194 spin_lock(&session->back_lock); 1195 break; 1196 case ISCSI_OP_REJECT: 1197 rc = iscsi_handle_reject(conn, hdr, data, datalen); 1198 break; 1199 case ISCSI_OP_ASYNC_EVENT: 1200 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; 1201 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) 1202 rc = ISCSI_ERR_CONN_FAILED; 1203 break; 1204 default: 1205 rc = ISCSI_ERR_BAD_OPCODE; 1206 break; 1207 } 1208 goto out; 1209 } 1210 1211 switch(opcode) { 1212 case ISCSI_OP_SCSI_CMD_RSP: 1213 case ISCSI_OP_SCSI_DATA_IN: 1214 task = iscsi_itt_to_ctask(conn, hdr->itt); 1215 if (!task) 1216 return ISCSI_ERR_BAD_ITT; 1217 task->last_xfer = jiffies; 1218 break; 1219 case ISCSI_OP_R2T: 1220 /* 1221 * LLD handles R2Ts if they need to. 1222 */ 1223 return 0; 1224 case ISCSI_OP_LOGOUT_RSP: 1225 case ISCSI_OP_LOGIN_RSP: 1226 case ISCSI_OP_TEXT_RSP: 1227 case ISCSI_OP_SCSI_TMFUNC_RSP: 1228 case ISCSI_OP_NOOP_IN: 1229 task = iscsi_itt_to_task(conn, hdr->itt); 1230 if (!task) 1231 return ISCSI_ERR_BAD_ITT; 1232 break; 1233 default: 1234 return ISCSI_ERR_BAD_OPCODE; 1235 } 1236 1237 switch(opcode) { 1238 case ISCSI_OP_SCSI_CMD_RSP: 1239 iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen); 1240 break; 1241 case ISCSI_OP_SCSI_DATA_IN: 1242 iscsi_data_in_rsp(conn, hdr, task); 1243 break; 1244 case ISCSI_OP_LOGOUT_RSP: 1245 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); 1246 if (datalen) { 1247 rc = ISCSI_ERR_PROTO; 1248 break; 1249 } 1250 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; 1251 goto recv_pdu; 1252 case ISCSI_OP_LOGIN_RSP: 1253 case ISCSI_OP_TEXT_RSP: 1254 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); 1255 /* 1256 * login related PDU's exp_statsn is handled in 1257 * userspace 1258 */ 1259 goto recv_pdu; 1260 case ISCSI_OP_SCSI_TMFUNC_RSP: 1261 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); 1262 if (datalen) { 1263 rc = ISCSI_ERR_PROTO; 1264 break; 1265 } 1266 1267 iscsi_tmf_rsp(conn, hdr); 1268 iscsi_complete_task(task, ISCSI_TASK_COMPLETED); 1269 break; 1270 case ISCSI_OP_NOOP_IN: 1271 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); 1272 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) { 1273 rc = ISCSI_ERR_PROTO; 1274 break; 1275 } 1276 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; 1277 1278 rc = iscsi_nop_out_rsp(task, (struct iscsi_nopin*)hdr, 1279 data, datalen); 1280 break; 1281 default: 1282 rc = ISCSI_ERR_BAD_OPCODE; 1283 break; 1284 } 1285 1286 out: 1287 return rc; 1288 recv_pdu: 1289 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) 1290 rc = ISCSI_ERR_CONN_FAILED; 1291 iscsi_complete_task(task, ISCSI_TASK_COMPLETED); 1292 return rc; 1293 } 1294 EXPORT_SYMBOL_GPL(__iscsi_complete_pdu); 1295 1296 int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 1297 char *data, int datalen) 1298 { 1299 int rc; 1300 1301 spin_lock(&conn->session->back_lock); 1302 rc = __iscsi_complete_pdu(conn, hdr, data, datalen); 1303 spin_unlock(&conn->session->back_lock); 1304 return rc; 1305 } 1306 EXPORT_SYMBOL_GPL(iscsi_complete_pdu); 1307 1308 int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt) 1309 { 1310 struct iscsi_session *session = conn->session; 1311 int age = 0, i = 0; 1312 1313 if (itt == RESERVED_ITT) 1314 return 0; 1315 1316 if (session->tt->parse_pdu_itt) 1317 session->tt->parse_pdu_itt(conn, itt, &i, &age); 1318 else { 1319 i = get_itt(itt); 1320 age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK; 1321 } 1322 1323 if (age != session->age) { 1324 iscsi_conn_printk(KERN_ERR, conn, 1325 "received itt %x expected session age (%x)\n", 1326 (__force u32)itt, session->age); 1327 return ISCSI_ERR_BAD_ITT; 1328 } 1329 1330 if (i >= session->cmds_max) { 1331 iscsi_conn_printk(KERN_ERR, conn, 1332 "received invalid itt index %u (max cmds " 1333 "%u.\n", i, session->cmds_max); 1334 return ISCSI_ERR_BAD_ITT; 1335 } 1336 return 0; 1337 } 1338 EXPORT_SYMBOL_GPL(iscsi_verify_itt); 1339 1340 /** 1341 * iscsi_itt_to_ctask - look up ctask by itt 1342 * @conn: iscsi connection 1343 * @itt: itt 1344 * 1345 * This should be used for cmd tasks. 1346 * 1347 * The session back_lock must be held. 1348 */ 1349 struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt) 1350 { 1351 struct iscsi_task *task; 1352 1353 if (iscsi_verify_itt(conn, itt)) 1354 return NULL; 1355 1356 task = iscsi_itt_to_task(conn, itt); 1357 if (!task || !task->sc) 1358 return NULL; 1359 1360 if (task->sc->SCp.phase != conn->session->age) { 1361 iscsi_session_printk(KERN_ERR, conn->session, 1362 "task's session age %d, expected %d\n", 1363 task->sc->SCp.phase, conn->session->age); 1364 return NULL; 1365 } 1366 1367 return task; 1368 } 1369 EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask); 1370 1371 void iscsi_session_failure(struct iscsi_session *session, 1372 enum iscsi_err err) 1373 { 1374 struct iscsi_conn *conn; 1375 struct device *dev; 1376 1377 spin_lock_bh(&session->frwd_lock); 1378 conn = session->leadconn; 1379 if (session->state == ISCSI_STATE_TERMINATE || !conn) { 1380 spin_unlock_bh(&session->frwd_lock); 1381 return; 1382 } 1383 1384 dev = get_device(&conn->cls_conn->dev); 1385 spin_unlock_bh(&session->frwd_lock); 1386 if (!dev) 1387 return; 1388 /* 1389 * if the host is being removed bypass the connection 1390 * recovery initialization because we are going to kill 1391 * the session. 1392 */ 1393 if (err == ISCSI_ERR_INVALID_HOST) 1394 iscsi_conn_error_event(conn->cls_conn, err); 1395 else 1396 iscsi_conn_failure(conn, err); 1397 put_device(dev); 1398 } 1399 EXPORT_SYMBOL_GPL(iscsi_session_failure); 1400 1401 void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err) 1402 { 1403 struct iscsi_session *session = conn->session; 1404 1405 spin_lock_bh(&session->frwd_lock); 1406 if (session->state == ISCSI_STATE_FAILED) { 1407 spin_unlock_bh(&session->frwd_lock); 1408 return; 1409 } 1410 1411 if (conn->stop_stage == 0) 1412 session->state = ISCSI_STATE_FAILED; 1413 spin_unlock_bh(&session->frwd_lock); 1414 1415 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); 1416 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); 1417 iscsi_conn_error_event(conn->cls_conn, err); 1418 } 1419 EXPORT_SYMBOL_GPL(iscsi_conn_failure); 1420 1421 static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn) 1422 { 1423 struct iscsi_session *session = conn->session; 1424 1425 /* 1426 * Check for iSCSI window and take care of CmdSN wrap-around 1427 */ 1428 if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) { 1429 ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn " 1430 "%u MaxCmdSN %u CmdSN %u/%u\n", 1431 session->exp_cmdsn, session->max_cmdsn, 1432 session->cmdsn, session->queued_cmdsn); 1433 return -ENOSPC; 1434 } 1435 return 0; 1436 } 1437 1438 static int iscsi_xmit_task(struct iscsi_conn *conn) 1439 { 1440 struct iscsi_task *task = conn->task; 1441 int rc; 1442 1443 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) 1444 return -ENODATA; 1445 1446 __iscsi_get_task(task); 1447 spin_unlock_bh(&conn->session->frwd_lock); 1448 rc = conn->session->tt->xmit_task(task); 1449 spin_lock_bh(&conn->session->frwd_lock); 1450 if (!rc) { 1451 /* done with this task */ 1452 task->last_xfer = jiffies; 1453 conn->task = NULL; 1454 } 1455 /* regular RX path uses back_lock */ 1456 spin_lock(&conn->session->back_lock); 1457 __iscsi_put_task(task); 1458 spin_unlock(&conn->session->back_lock); 1459 return rc; 1460 } 1461 1462 /** 1463 * iscsi_requeue_task - requeue task to run from session workqueue 1464 * @task: task to requeue 1465 * 1466 * LLDs that need to run a task from the session workqueue should call 1467 * this. The session frwd_lock must be held. This should only be called 1468 * by software drivers. 1469 */ 1470 void iscsi_requeue_task(struct iscsi_task *task) 1471 { 1472 struct iscsi_conn *conn = task->conn; 1473 1474 /* 1475 * this may be on the requeue list already if the xmit_task callout 1476 * is handling the r2ts while we are adding new ones 1477 */ 1478 if (list_empty(&task->running)) 1479 list_add_tail(&task->running, &conn->requeue); 1480 iscsi_conn_queue_work(conn); 1481 } 1482 EXPORT_SYMBOL_GPL(iscsi_requeue_task); 1483 1484 /** 1485 * iscsi_data_xmit - xmit any command into the scheduled connection 1486 * @conn: iscsi connection 1487 * 1488 * Notes: 1489 * The function can return -EAGAIN in which case the caller must 1490 * re-schedule it again later or recover. '0' return code means 1491 * successful xmit. 1492 **/ 1493 static int iscsi_data_xmit(struct iscsi_conn *conn) 1494 { 1495 struct iscsi_task *task; 1496 int rc = 0; 1497 1498 spin_lock_bh(&conn->session->frwd_lock); 1499 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) { 1500 ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n"); 1501 spin_unlock_bh(&conn->session->frwd_lock); 1502 return -ENODATA; 1503 } 1504 1505 if (conn->task) { 1506 rc = iscsi_xmit_task(conn); 1507 if (rc) 1508 goto done; 1509 } 1510 1511 /* 1512 * process mgmt pdus like nops before commands since we should 1513 * only have one nop-out as a ping from us and targets should not 1514 * overflow us with nop-ins 1515 */ 1516 check_mgmt: 1517 while (!list_empty(&conn->mgmtqueue)) { 1518 conn->task = list_entry(conn->mgmtqueue.next, 1519 struct iscsi_task, running); 1520 list_del_init(&conn->task->running); 1521 if (iscsi_prep_mgmt_task(conn, conn->task)) { 1522 /* regular RX path uses back_lock */ 1523 spin_lock_bh(&conn->session->back_lock); 1524 __iscsi_put_task(conn->task); 1525 spin_unlock_bh(&conn->session->back_lock); 1526 conn->task = NULL; 1527 continue; 1528 } 1529 rc = iscsi_xmit_task(conn); 1530 if (rc) 1531 goto done; 1532 } 1533 1534 /* process pending command queue */ 1535 while (!list_empty(&conn->cmdqueue)) { 1536 conn->task = list_entry(conn->cmdqueue.next, struct iscsi_task, 1537 running); 1538 list_del_init(&conn->task->running); 1539 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) { 1540 fail_scsi_task(conn->task, DID_IMM_RETRY); 1541 continue; 1542 } 1543 rc = iscsi_prep_scsi_cmd_pdu(conn->task); 1544 if (rc) { 1545 if (rc == -ENOMEM || rc == -EACCES) { 1546 list_add_tail(&conn->task->running, 1547 &conn->cmdqueue); 1548 conn->task = NULL; 1549 goto done; 1550 } else 1551 fail_scsi_task(conn->task, DID_ABORT); 1552 continue; 1553 } 1554 rc = iscsi_xmit_task(conn); 1555 if (rc) 1556 goto done; 1557 /* 1558 * we could continuously get new task requests so 1559 * we need to check the mgmt queue for nops that need to 1560 * be sent to aviod starvation 1561 */ 1562 if (!list_empty(&conn->mgmtqueue)) 1563 goto check_mgmt; 1564 } 1565 1566 while (!list_empty(&conn->requeue)) { 1567 /* 1568 * we always do fastlogout - conn stop code will clean up. 1569 */ 1570 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) 1571 break; 1572 1573 task = list_entry(conn->requeue.next, struct iscsi_task, 1574 running); 1575 if (iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_DATA_OUT)) 1576 break; 1577 1578 conn->task = task; 1579 list_del_init(&conn->task->running); 1580 conn->task->state = ISCSI_TASK_RUNNING; 1581 rc = iscsi_xmit_task(conn); 1582 if (rc) 1583 goto done; 1584 if (!list_empty(&conn->mgmtqueue)) 1585 goto check_mgmt; 1586 } 1587 spin_unlock_bh(&conn->session->frwd_lock); 1588 return -ENODATA; 1589 1590 done: 1591 spin_unlock_bh(&conn->session->frwd_lock); 1592 return rc; 1593 } 1594 1595 static void iscsi_xmitworker(struct work_struct *work) 1596 { 1597 struct iscsi_conn *conn = 1598 container_of(work, struct iscsi_conn, xmitwork); 1599 int rc; 1600 /* 1601 * serialize Xmit worker on a per-connection basis. 1602 */ 1603 do { 1604 rc = iscsi_data_xmit(conn); 1605 } while (rc >= 0 || rc == -EAGAIN); 1606 } 1607 1608 static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn, 1609 struct scsi_cmnd *sc) 1610 { 1611 struct iscsi_task *task; 1612 1613 if (!kfifo_out(&conn->session->cmdpool.queue, 1614 (void *) &task, sizeof(void *))) 1615 return NULL; 1616 1617 sc->SCp.phase = conn->session->age; 1618 sc->SCp.ptr = (char *) task; 1619 1620 atomic_set(&task->refcount, 1); 1621 task->state = ISCSI_TASK_PENDING; 1622 task->conn = conn; 1623 task->sc = sc; 1624 task->have_checked_conn = false; 1625 task->last_timeout = jiffies; 1626 task->last_xfer = jiffies; 1627 task->protected = false; 1628 INIT_LIST_HEAD(&task->running); 1629 return task; 1630 } 1631 1632 enum { 1633 FAILURE_BAD_HOST = 1, 1634 FAILURE_SESSION_FAILED, 1635 FAILURE_SESSION_FREED, 1636 FAILURE_WINDOW_CLOSED, 1637 FAILURE_OOM, 1638 FAILURE_SESSION_TERMINATE, 1639 FAILURE_SESSION_IN_RECOVERY, 1640 FAILURE_SESSION_RECOVERY_TIMEOUT, 1641 FAILURE_SESSION_LOGGING_OUT, 1642 FAILURE_SESSION_NOT_READY, 1643 }; 1644 1645 int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc) 1646 { 1647 struct iscsi_cls_session *cls_session; 1648 struct iscsi_host *ihost; 1649 int reason = 0; 1650 struct iscsi_session *session; 1651 struct iscsi_conn *conn; 1652 struct iscsi_task *task = NULL; 1653 1654 sc->result = 0; 1655 sc->SCp.ptr = NULL; 1656 1657 ihost = shost_priv(host); 1658 1659 cls_session = starget_to_session(scsi_target(sc->device)); 1660 session = cls_session->dd_data; 1661 spin_lock_bh(&session->frwd_lock); 1662 1663 reason = iscsi_session_chkready(cls_session); 1664 if (reason) { 1665 sc->result = reason; 1666 goto fault; 1667 } 1668 1669 if (session->state != ISCSI_STATE_LOGGED_IN) { 1670 /* 1671 * to handle the race between when we set the recovery state 1672 * and block the session we requeue here (commands could 1673 * be entering our queuecommand while a block is starting 1674 * up because the block code is not locked) 1675 */ 1676 switch (session->state) { 1677 case ISCSI_STATE_FAILED: 1678 case ISCSI_STATE_IN_RECOVERY: 1679 reason = FAILURE_SESSION_IN_RECOVERY; 1680 sc->result = DID_IMM_RETRY << 16; 1681 break; 1682 case ISCSI_STATE_LOGGING_OUT: 1683 reason = FAILURE_SESSION_LOGGING_OUT; 1684 sc->result = DID_IMM_RETRY << 16; 1685 break; 1686 case ISCSI_STATE_RECOVERY_FAILED: 1687 reason = FAILURE_SESSION_RECOVERY_TIMEOUT; 1688 sc->result = DID_TRANSPORT_FAILFAST << 16; 1689 break; 1690 case ISCSI_STATE_TERMINATE: 1691 reason = FAILURE_SESSION_TERMINATE; 1692 sc->result = DID_NO_CONNECT << 16; 1693 break; 1694 default: 1695 reason = FAILURE_SESSION_FREED; 1696 sc->result = DID_NO_CONNECT << 16; 1697 } 1698 goto fault; 1699 } 1700 1701 conn = session->leadconn; 1702 if (!conn) { 1703 reason = FAILURE_SESSION_FREED; 1704 sc->result = DID_NO_CONNECT << 16; 1705 goto fault; 1706 } 1707 1708 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) { 1709 reason = FAILURE_SESSION_IN_RECOVERY; 1710 sc->result = DID_REQUEUE; 1711 goto fault; 1712 } 1713 1714 if (iscsi_check_cmdsn_window_closed(conn)) { 1715 reason = FAILURE_WINDOW_CLOSED; 1716 goto reject; 1717 } 1718 1719 task = iscsi_alloc_task(conn, sc); 1720 if (!task) { 1721 reason = FAILURE_OOM; 1722 goto reject; 1723 } 1724 1725 if (!ihost->workq) { 1726 reason = iscsi_prep_scsi_cmd_pdu(task); 1727 if (reason) { 1728 if (reason == -ENOMEM || reason == -EACCES) { 1729 reason = FAILURE_OOM; 1730 goto prepd_reject; 1731 } else { 1732 sc->result = DID_ABORT << 16; 1733 goto prepd_fault; 1734 } 1735 } 1736 if (session->tt->xmit_task(task)) { 1737 session->cmdsn--; 1738 reason = FAILURE_SESSION_NOT_READY; 1739 goto prepd_reject; 1740 } 1741 } else { 1742 list_add_tail(&task->running, &conn->cmdqueue); 1743 iscsi_conn_queue_work(conn); 1744 } 1745 1746 session->queued_cmdsn++; 1747 spin_unlock_bh(&session->frwd_lock); 1748 return 0; 1749 1750 prepd_reject: 1751 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ); 1752 reject: 1753 spin_unlock_bh(&session->frwd_lock); 1754 ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n", 1755 sc->cmnd[0], reason); 1756 return SCSI_MLQUEUE_TARGET_BUSY; 1757 1758 prepd_fault: 1759 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ); 1760 fault: 1761 spin_unlock_bh(&session->frwd_lock); 1762 ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n", 1763 sc->cmnd[0], reason); 1764 if (!scsi_bidi_cmnd(sc)) 1765 scsi_set_resid(sc, scsi_bufflen(sc)); 1766 else { 1767 scsi_out(sc)->resid = scsi_out(sc)->length; 1768 scsi_in(sc)->resid = scsi_in(sc)->length; 1769 } 1770 sc->scsi_done(sc); 1771 return 0; 1772 } 1773 EXPORT_SYMBOL_GPL(iscsi_queuecommand); 1774 1775 int iscsi_target_alloc(struct scsi_target *starget) 1776 { 1777 struct iscsi_cls_session *cls_session = starget_to_session(starget); 1778 struct iscsi_session *session = cls_session->dd_data; 1779 1780 starget->can_queue = session->scsi_cmds_max; 1781 return 0; 1782 } 1783 EXPORT_SYMBOL_GPL(iscsi_target_alloc); 1784 1785 static void iscsi_tmf_timedout(unsigned long data) 1786 { 1787 struct iscsi_conn *conn = (struct iscsi_conn *)data; 1788 struct iscsi_session *session = conn->session; 1789 1790 spin_lock(&session->frwd_lock); 1791 if (conn->tmf_state == TMF_QUEUED) { 1792 conn->tmf_state = TMF_TIMEDOUT; 1793 ISCSI_DBG_EH(session, "tmf timedout\n"); 1794 /* unblock eh_abort() */ 1795 wake_up(&conn->ehwait); 1796 } 1797 spin_unlock(&session->frwd_lock); 1798 } 1799 1800 static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn, 1801 struct iscsi_tm *hdr, int age, 1802 int timeout) 1803 { 1804 struct iscsi_session *session = conn->session; 1805 struct iscsi_task *task; 1806 1807 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr, 1808 NULL, 0); 1809 if (!task) { 1810 spin_unlock_bh(&session->frwd_lock); 1811 iscsi_conn_printk(KERN_ERR, conn, "Could not send TMF.\n"); 1812 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); 1813 spin_lock_bh(&session->frwd_lock); 1814 return -EPERM; 1815 } 1816 conn->tmfcmd_pdus_cnt++; 1817 conn->tmf_timer.expires = timeout * HZ + jiffies; 1818 conn->tmf_timer.function = iscsi_tmf_timedout; 1819 conn->tmf_timer.data = (unsigned long)conn; 1820 add_timer(&conn->tmf_timer); 1821 ISCSI_DBG_EH(session, "tmf set timeout\n"); 1822 1823 spin_unlock_bh(&session->frwd_lock); 1824 mutex_unlock(&session->eh_mutex); 1825 1826 /* 1827 * block eh thread until: 1828 * 1829 * 1) tmf response 1830 * 2) tmf timeout 1831 * 3) session is terminated or restarted or userspace has 1832 * given up on recovery 1833 */ 1834 wait_event_interruptible(conn->ehwait, age != session->age || 1835 session->state != ISCSI_STATE_LOGGED_IN || 1836 conn->tmf_state != TMF_QUEUED); 1837 if (signal_pending(current)) 1838 flush_signals(current); 1839 del_timer_sync(&conn->tmf_timer); 1840 1841 mutex_lock(&session->eh_mutex); 1842 spin_lock_bh(&session->frwd_lock); 1843 /* if the session drops it will clean up the task */ 1844 if (age != session->age || 1845 session->state != ISCSI_STATE_LOGGED_IN) 1846 return -ENOTCONN; 1847 return 0; 1848 } 1849 1850 /* 1851 * Fail commands. session lock held and recv side suspended and xmit 1852 * thread flushed 1853 */ 1854 static void fail_scsi_tasks(struct iscsi_conn *conn, u64 lun, int error) 1855 { 1856 struct iscsi_task *task; 1857 int i; 1858 1859 for (i = 0; i < conn->session->cmds_max; i++) { 1860 task = conn->session->cmds[i]; 1861 if (!task->sc || task->state == ISCSI_TASK_FREE) 1862 continue; 1863 1864 if (lun != -1 && lun != task->sc->device->lun) 1865 continue; 1866 1867 ISCSI_DBG_SESSION(conn->session, 1868 "failing sc %p itt 0x%x state %d\n", 1869 task->sc, task->itt, task->state); 1870 fail_scsi_task(task, error); 1871 } 1872 } 1873 1874 /** 1875 * iscsi_suspend_queue - suspend iscsi_queuecommand 1876 * @conn: iscsi conn to stop queueing IO on 1877 * 1878 * This grabs the session frwd_lock to make sure no one is in 1879 * xmit_task/queuecommand, and then sets suspend to prevent 1880 * new commands from being queued. This only needs to be called 1881 * by offload drivers that need to sync a path like ep disconnect 1882 * with the iscsi_queuecommand/xmit_task. To start IO again libiscsi 1883 * will call iscsi_start_tx and iscsi_unblock_session when in FFP. 1884 */ 1885 void iscsi_suspend_queue(struct iscsi_conn *conn) 1886 { 1887 spin_lock_bh(&conn->session->frwd_lock); 1888 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); 1889 spin_unlock_bh(&conn->session->frwd_lock); 1890 } 1891 EXPORT_SYMBOL_GPL(iscsi_suspend_queue); 1892 1893 /** 1894 * iscsi_suspend_tx - suspend iscsi_data_xmit 1895 * @conn: iscsi conn tp stop processing IO on. 1896 * 1897 * This function sets the suspend bit to prevent iscsi_data_xmit 1898 * from sending new IO, and if work is queued on the xmit thread 1899 * it will wait for it to be completed. 1900 */ 1901 void iscsi_suspend_tx(struct iscsi_conn *conn) 1902 { 1903 struct Scsi_Host *shost = conn->session->host; 1904 struct iscsi_host *ihost = shost_priv(shost); 1905 1906 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); 1907 if (ihost->workq) 1908 flush_workqueue(ihost->workq); 1909 } 1910 EXPORT_SYMBOL_GPL(iscsi_suspend_tx); 1911 1912 static void iscsi_start_tx(struct iscsi_conn *conn) 1913 { 1914 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); 1915 iscsi_conn_queue_work(conn); 1916 } 1917 1918 /* 1919 * We want to make sure a ping is in flight. It has timed out. 1920 * And we are not busy processing a pdu that is making 1921 * progress but got started before the ping and is taking a while 1922 * to complete so the ping is just stuck behind it in a queue. 1923 */ 1924 static int iscsi_has_ping_timed_out(struct iscsi_conn *conn) 1925 { 1926 if (conn->ping_task && 1927 time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) + 1928 (conn->ping_timeout * HZ), jiffies)) 1929 return 1; 1930 else 1931 return 0; 1932 } 1933 1934 enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc) 1935 { 1936 enum blk_eh_timer_return rc = BLK_EH_NOT_HANDLED; 1937 struct iscsi_task *task = NULL, *running_task; 1938 struct iscsi_cls_session *cls_session; 1939 struct iscsi_session *session; 1940 struct iscsi_conn *conn; 1941 int i; 1942 1943 cls_session = starget_to_session(scsi_target(sc->device)); 1944 session = cls_session->dd_data; 1945 1946 ISCSI_DBG_EH(session, "scsi cmd %p timedout\n", sc); 1947 1948 spin_lock(&session->frwd_lock); 1949 task = (struct iscsi_task *)sc->SCp.ptr; 1950 if (!task) { 1951 /* 1952 * Raced with completion. Blk layer has taken ownership 1953 * so let timeout code complete it now. 1954 */ 1955 rc = BLK_EH_HANDLED; 1956 goto done; 1957 } 1958 1959 if (session->state != ISCSI_STATE_LOGGED_IN) { 1960 /* 1961 * We are probably in the middle of iscsi recovery so let 1962 * that complete and handle the error. 1963 */ 1964 rc = BLK_EH_RESET_TIMER; 1965 goto done; 1966 } 1967 1968 conn = session->leadconn; 1969 if (!conn) { 1970 /* In the middle of shuting down */ 1971 rc = BLK_EH_RESET_TIMER; 1972 goto done; 1973 } 1974 1975 /* 1976 * If we have sent (at least queued to the network layer) a pdu or 1977 * recvd one for the task since the last timeout ask for 1978 * more time. If on the next timeout we have not made progress 1979 * we can check if it is the task or connection when we send the 1980 * nop as a ping. 1981 */ 1982 if (time_after(task->last_xfer, task->last_timeout)) { 1983 ISCSI_DBG_EH(session, "Command making progress. Asking " 1984 "scsi-ml for more time to complete. " 1985 "Last data xfer at %lu. Last timeout was at " 1986 "%lu\n.", task->last_xfer, task->last_timeout); 1987 task->have_checked_conn = false; 1988 rc = BLK_EH_RESET_TIMER; 1989 goto done; 1990 } 1991 1992 if (!conn->recv_timeout && !conn->ping_timeout) 1993 goto done; 1994 /* 1995 * if the ping timedout then we are in the middle of cleaning up 1996 * and can let the iscsi eh handle it 1997 */ 1998 if (iscsi_has_ping_timed_out(conn)) { 1999 rc = BLK_EH_RESET_TIMER; 2000 goto done; 2001 } 2002 2003 for (i = 0; i < conn->session->cmds_max; i++) { 2004 running_task = conn->session->cmds[i]; 2005 if (!running_task->sc || running_task == task || 2006 running_task->state != ISCSI_TASK_RUNNING) 2007 continue; 2008 2009 /* 2010 * Only check if cmds started before this one have made 2011 * progress, or this could never fail 2012 */ 2013 if (time_after(running_task->sc->jiffies_at_alloc, 2014 task->sc->jiffies_at_alloc)) 2015 continue; 2016 2017 if (time_after(running_task->last_xfer, task->last_timeout)) { 2018 /* 2019 * This task has not made progress, but a task 2020 * started before us has transferred data since 2021 * we started/last-checked. We could be queueing 2022 * too many tasks or the LU is bad. 2023 * 2024 * If the device is bad the cmds ahead of us on 2025 * other devs will complete, and this loop will 2026 * eventually fail starting the scsi eh. 2027 */ 2028 ISCSI_DBG_EH(session, "Command has not made progress " 2029 "but commands ahead of it have. " 2030 "Asking scsi-ml for more time to " 2031 "complete. Our last xfer vs running task " 2032 "last xfer %lu/%lu. Last check %lu.\n", 2033 task->last_xfer, running_task->last_xfer, 2034 task->last_timeout); 2035 rc = BLK_EH_RESET_TIMER; 2036 goto done; 2037 } 2038 } 2039 2040 /* Assumes nop timeout is shorter than scsi cmd timeout */ 2041 if (task->have_checked_conn) 2042 goto done; 2043 2044 /* 2045 * Checking the transport already or nop from a cmd timeout still 2046 * running 2047 */ 2048 if (conn->ping_task) { 2049 task->have_checked_conn = true; 2050 rc = BLK_EH_RESET_TIMER; 2051 goto done; 2052 } 2053 2054 /* Make sure there is a transport check done */ 2055 iscsi_send_nopout(conn, NULL); 2056 task->have_checked_conn = true; 2057 rc = BLK_EH_RESET_TIMER; 2058 2059 done: 2060 if (task) 2061 task->last_timeout = jiffies; 2062 spin_unlock(&session->frwd_lock); 2063 ISCSI_DBG_EH(session, "return %s\n", rc == BLK_EH_RESET_TIMER ? 2064 "timer reset" : "nh"); 2065 return rc; 2066 } 2067 EXPORT_SYMBOL_GPL(iscsi_eh_cmd_timed_out); 2068 2069 static void iscsi_check_transport_timeouts(unsigned long data) 2070 { 2071 struct iscsi_conn *conn = (struct iscsi_conn *)data; 2072 struct iscsi_session *session = conn->session; 2073 unsigned long recv_timeout, next_timeout = 0, last_recv; 2074 2075 spin_lock(&session->frwd_lock); 2076 if (session->state != ISCSI_STATE_LOGGED_IN) 2077 goto done; 2078 2079 recv_timeout = conn->recv_timeout; 2080 if (!recv_timeout) 2081 goto done; 2082 2083 recv_timeout *= HZ; 2084 last_recv = conn->last_recv; 2085 2086 if (iscsi_has_ping_timed_out(conn)) { 2087 iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs " 2088 "expired, recv timeout %d, last rx %lu, " 2089 "last ping %lu, now %lu\n", 2090 conn->ping_timeout, conn->recv_timeout, 2091 last_recv, conn->last_ping, jiffies); 2092 spin_unlock(&session->frwd_lock); 2093 iscsi_conn_failure(conn, ISCSI_ERR_NOP_TIMEDOUT); 2094 return; 2095 } 2096 2097 if (time_before_eq(last_recv + recv_timeout, jiffies)) { 2098 /* send a ping to try to provoke some traffic */ 2099 ISCSI_DBG_CONN(conn, "Sending nopout as ping\n"); 2100 if (iscsi_send_nopout(conn, NULL)) 2101 next_timeout = jiffies + (1 * HZ); 2102 else 2103 next_timeout = conn->last_ping + (conn->ping_timeout * HZ); 2104 } else 2105 next_timeout = last_recv + recv_timeout; 2106 2107 ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout); 2108 mod_timer(&conn->transport_timer, next_timeout); 2109 done: 2110 spin_unlock(&session->frwd_lock); 2111 } 2112 2113 static void iscsi_prep_abort_task_pdu(struct iscsi_task *task, 2114 struct iscsi_tm *hdr) 2115 { 2116 memset(hdr, 0, sizeof(*hdr)); 2117 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; 2118 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK; 2119 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2120 hdr->lun = task->lun; 2121 hdr->rtt = task->hdr_itt; 2122 hdr->refcmdsn = task->cmdsn; 2123 } 2124 2125 int iscsi_eh_abort(struct scsi_cmnd *sc) 2126 { 2127 struct iscsi_cls_session *cls_session; 2128 struct iscsi_session *session; 2129 struct iscsi_conn *conn; 2130 struct iscsi_task *task; 2131 struct iscsi_tm *hdr; 2132 int age; 2133 2134 cls_session = starget_to_session(scsi_target(sc->device)); 2135 session = cls_session->dd_data; 2136 2137 ISCSI_DBG_EH(session, "aborting sc %p\n", sc); 2138 2139 mutex_lock(&session->eh_mutex); 2140 spin_lock_bh(&session->frwd_lock); 2141 /* 2142 * if session was ISCSI_STATE_IN_RECOVERY then we may not have 2143 * got the command. 2144 */ 2145 if (!sc->SCp.ptr) { 2146 ISCSI_DBG_EH(session, "sc never reached iscsi layer or " 2147 "it completed.\n"); 2148 spin_unlock_bh(&session->frwd_lock); 2149 mutex_unlock(&session->eh_mutex); 2150 return SUCCESS; 2151 } 2152 2153 /* 2154 * If we are not logged in or we have started a new session 2155 * then let the host reset code handle this 2156 */ 2157 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN || 2158 sc->SCp.phase != session->age) { 2159 spin_unlock_bh(&session->frwd_lock); 2160 mutex_unlock(&session->eh_mutex); 2161 ISCSI_DBG_EH(session, "failing abort due to dropped " 2162 "session.\n"); 2163 return FAILED; 2164 } 2165 2166 conn = session->leadconn; 2167 conn->eh_abort_cnt++; 2168 age = session->age; 2169 2170 task = (struct iscsi_task *)sc->SCp.ptr; 2171 ISCSI_DBG_EH(session, "aborting [sc %p itt 0x%x]\n", 2172 sc, task->itt); 2173 2174 /* task completed before time out */ 2175 if (!task->sc) { 2176 ISCSI_DBG_EH(session, "sc completed while abort in progress\n"); 2177 goto success; 2178 } 2179 2180 if (task->state == ISCSI_TASK_PENDING) { 2181 fail_scsi_task(task, DID_ABORT); 2182 goto success; 2183 } 2184 2185 /* only have one tmf outstanding at a time */ 2186 if (conn->tmf_state != TMF_INITIAL) 2187 goto failed; 2188 conn->tmf_state = TMF_QUEUED; 2189 2190 hdr = &conn->tmhdr; 2191 iscsi_prep_abort_task_pdu(task, hdr); 2192 2193 if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) 2194 goto failed; 2195 2196 switch (conn->tmf_state) { 2197 case TMF_SUCCESS: 2198 spin_unlock_bh(&session->frwd_lock); 2199 /* 2200 * stop tx side incase the target had sent a abort rsp but 2201 * the initiator was still writing out data. 2202 */ 2203 iscsi_suspend_tx(conn); 2204 /* 2205 * we do not stop the recv side because targets have been 2206 * good and have never sent us a successful tmf response 2207 * then sent more data for the cmd. 2208 */ 2209 spin_lock_bh(&session->frwd_lock); 2210 fail_scsi_task(task, DID_ABORT); 2211 conn->tmf_state = TMF_INITIAL; 2212 memset(hdr, 0, sizeof(*hdr)); 2213 spin_unlock_bh(&session->frwd_lock); 2214 iscsi_start_tx(conn); 2215 goto success_unlocked; 2216 case TMF_TIMEDOUT: 2217 spin_unlock_bh(&session->frwd_lock); 2218 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); 2219 goto failed_unlocked; 2220 case TMF_NOT_FOUND: 2221 if (!sc->SCp.ptr) { 2222 conn->tmf_state = TMF_INITIAL; 2223 memset(hdr, 0, sizeof(*hdr)); 2224 /* task completed before tmf abort response */ 2225 ISCSI_DBG_EH(session, "sc completed while abort in " 2226 "progress\n"); 2227 goto success; 2228 } 2229 /* fall through */ 2230 default: 2231 conn->tmf_state = TMF_INITIAL; 2232 goto failed; 2233 } 2234 2235 success: 2236 spin_unlock_bh(&session->frwd_lock); 2237 success_unlocked: 2238 ISCSI_DBG_EH(session, "abort success [sc %p itt 0x%x]\n", 2239 sc, task->itt); 2240 mutex_unlock(&session->eh_mutex); 2241 return SUCCESS; 2242 2243 failed: 2244 spin_unlock_bh(&session->frwd_lock); 2245 failed_unlocked: 2246 ISCSI_DBG_EH(session, "abort failed [sc %p itt 0x%x]\n", sc, 2247 task ? task->itt : 0); 2248 mutex_unlock(&session->eh_mutex); 2249 return FAILED; 2250 } 2251 EXPORT_SYMBOL_GPL(iscsi_eh_abort); 2252 2253 static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) 2254 { 2255 memset(hdr, 0, sizeof(*hdr)); 2256 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; 2257 hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK; 2258 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2259 int_to_scsilun(sc->device->lun, &hdr->lun); 2260 hdr->rtt = RESERVED_ITT; 2261 } 2262 2263 int iscsi_eh_device_reset(struct scsi_cmnd *sc) 2264 { 2265 struct iscsi_cls_session *cls_session; 2266 struct iscsi_session *session; 2267 struct iscsi_conn *conn; 2268 struct iscsi_tm *hdr; 2269 int rc = FAILED; 2270 2271 cls_session = starget_to_session(scsi_target(sc->device)); 2272 session = cls_session->dd_data; 2273 2274 ISCSI_DBG_EH(session, "LU Reset [sc %p lun %llu]\n", sc, 2275 sc->device->lun); 2276 2277 mutex_lock(&session->eh_mutex); 2278 spin_lock_bh(&session->frwd_lock); 2279 /* 2280 * Just check if we are not logged in. We cannot check for 2281 * the phase because the reset could come from a ioctl. 2282 */ 2283 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) 2284 goto unlock; 2285 conn = session->leadconn; 2286 2287 /* only have one tmf outstanding at a time */ 2288 if (conn->tmf_state != TMF_INITIAL) 2289 goto unlock; 2290 conn->tmf_state = TMF_QUEUED; 2291 2292 hdr = &conn->tmhdr; 2293 iscsi_prep_lun_reset_pdu(sc, hdr); 2294 2295 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, 2296 session->lu_reset_timeout)) { 2297 rc = FAILED; 2298 goto unlock; 2299 } 2300 2301 switch (conn->tmf_state) { 2302 case TMF_SUCCESS: 2303 break; 2304 case TMF_TIMEDOUT: 2305 spin_unlock_bh(&session->frwd_lock); 2306 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); 2307 goto done; 2308 default: 2309 conn->tmf_state = TMF_INITIAL; 2310 goto unlock; 2311 } 2312 2313 rc = SUCCESS; 2314 spin_unlock_bh(&session->frwd_lock); 2315 2316 iscsi_suspend_tx(conn); 2317 2318 spin_lock_bh(&session->frwd_lock); 2319 memset(hdr, 0, sizeof(*hdr)); 2320 fail_scsi_tasks(conn, sc->device->lun, DID_ERROR); 2321 conn->tmf_state = TMF_INITIAL; 2322 spin_unlock_bh(&session->frwd_lock); 2323 2324 iscsi_start_tx(conn); 2325 goto done; 2326 2327 unlock: 2328 spin_unlock_bh(&session->frwd_lock); 2329 done: 2330 ISCSI_DBG_EH(session, "dev reset result = %s\n", 2331 rc == SUCCESS ? "SUCCESS" : "FAILED"); 2332 mutex_unlock(&session->eh_mutex); 2333 return rc; 2334 } 2335 EXPORT_SYMBOL_GPL(iscsi_eh_device_reset); 2336 2337 void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session) 2338 { 2339 struct iscsi_session *session = cls_session->dd_data; 2340 2341 spin_lock_bh(&session->frwd_lock); 2342 if (session->state != ISCSI_STATE_LOGGED_IN) { 2343 session->state = ISCSI_STATE_RECOVERY_FAILED; 2344 if (session->leadconn) 2345 wake_up(&session->leadconn->ehwait); 2346 } 2347 spin_unlock_bh(&session->frwd_lock); 2348 } 2349 EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout); 2350 2351 /** 2352 * iscsi_eh_session_reset - drop session and attempt relogin 2353 * @sc: scsi command 2354 * 2355 * This function will wait for a relogin, session termination from 2356 * userspace, or a recovery/replacement timeout. 2357 */ 2358 int iscsi_eh_session_reset(struct scsi_cmnd *sc) 2359 { 2360 struct iscsi_cls_session *cls_session; 2361 struct iscsi_session *session; 2362 struct iscsi_conn *conn; 2363 2364 cls_session = starget_to_session(scsi_target(sc->device)); 2365 session = cls_session->dd_data; 2366 conn = session->leadconn; 2367 2368 mutex_lock(&session->eh_mutex); 2369 spin_lock_bh(&session->frwd_lock); 2370 if (session->state == ISCSI_STATE_TERMINATE) { 2371 failed: 2372 ISCSI_DBG_EH(session, 2373 "failing session reset: Could not log back into " 2374 "%s, %s [age %d]\n", session->targetname, 2375 conn->persistent_address, session->age); 2376 spin_unlock_bh(&session->frwd_lock); 2377 mutex_unlock(&session->eh_mutex); 2378 return FAILED; 2379 } 2380 2381 spin_unlock_bh(&session->frwd_lock); 2382 mutex_unlock(&session->eh_mutex); 2383 /* 2384 * we drop the lock here but the leadconn cannot be destoyed while 2385 * we are in the scsi eh 2386 */ 2387 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); 2388 2389 ISCSI_DBG_EH(session, "wait for relogin\n"); 2390 wait_event_interruptible(conn->ehwait, 2391 session->state == ISCSI_STATE_TERMINATE || 2392 session->state == ISCSI_STATE_LOGGED_IN || 2393 session->state == ISCSI_STATE_RECOVERY_FAILED); 2394 if (signal_pending(current)) 2395 flush_signals(current); 2396 2397 mutex_lock(&session->eh_mutex); 2398 spin_lock_bh(&session->frwd_lock); 2399 if (session->state == ISCSI_STATE_LOGGED_IN) { 2400 ISCSI_DBG_EH(session, 2401 "session reset succeeded for %s,%s\n", 2402 session->targetname, conn->persistent_address); 2403 } else 2404 goto failed; 2405 spin_unlock_bh(&session->frwd_lock); 2406 mutex_unlock(&session->eh_mutex); 2407 return SUCCESS; 2408 } 2409 EXPORT_SYMBOL_GPL(iscsi_eh_session_reset); 2410 2411 static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) 2412 { 2413 memset(hdr, 0, sizeof(*hdr)); 2414 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; 2415 hdr->flags = ISCSI_TM_FUNC_TARGET_WARM_RESET & ISCSI_FLAG_TM_FUNC_MASK; 2416 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2417 hdr->rtt = RESERVED_ITT; 2418 } 2419 2420 /** 2421 * iscsi_eh_target_reset - reset target 2422 * @sc: scsi command 2423 * 2424 * This will attempt to send a warm target reset. 2425 */ 2426 static int iscsi_eh_target_reset(struct scsi_cmnd *sc) 2427 { 2428 struct iscsi_cls_session *cls_session; 2429 struct iscsi_session *session; 2430 struct iscsi_conn *conn; 2431 struct iscsi_tm *hdr; 2432 int rc = FAILED; 2433 2434 cls_session = starget_to_session(scsi_target(sc->device)); 2435 session = cls_session->dd_data; 2436 2437 ISCSI_DBG_EH(session, "tgt Reset [sc %p tgt %s]\n", sc, 2438 session->targetname); 2439 2440 mutex_lock(&session->eh_mutex); 2441 spin_lock_bh(&session->frwd_lock); 2442 /* 2443 * Just check if we are not logged in. We cannot check for 2444 * the phase because the reset could come from a ioctl. 2445 */ 2446 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) 2447 goto unlock; 2448 conn = session->leadconn; 2449 2450 /* only have one tmf outstanding at a time */ 2451 if (conn->tmf_state != TMF_INITIAL) 2452 goto unlock; 2453 conn->tmf_state = TMF_QUEUED; 2454 2455 hdr = &conn->tmhdr; 2456 iscsi_prep_tgt_reset_pdu(sc, hdr); 2457 2458 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, 2459 session->tgt_reset_timeout)) { 2460 rc = FAILED; 2461 goto unlock; 2462 } 2463 2464 switch (conn->tmf_state) { 2465 case TMF_SUCCESS: 2466 break; 2467 case TMF_TIMEDOUT: 2468 spin_unlock_bh(&session->frwd_lock); 2469 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); 2470 goto done; 2471 default: 2472 conn->tmf_state = TMF_INITIAL; 2473 goto unlock; 2474 } 2475 2476 rc = SUCCESS; 2477 spin_unlock_bh(&session->frwd_lock); 2478 2479 iscsi_suspend_tx(conn); 2480 2481 spin_lock_bh(&session->frwd_lock); 2482 memset(hdr, 0, sizeof(*hdr)); 2483 fail_scsi_tasks(conn, -1, DID_ERROR); 2484 conn->tmf_state = TMF_INITIAL; 2485 spin_unlock_bh(&session->frwd_lock); 2486 2487 iscsi_start_tx(conn); 2488 goto done; 2489 2490 unlock: 2491 spin_unlock_bh(&session->frwd_lock); 2492 done: 2493 ISCSI_DBG_EH(session, "tgt %s reset result = %s\n", session->targetname, 2494 rc == SUCCESS ? "SUCCESS" : "FAILED"); 2495 mutex_unlock(&session->eh_mutex); 2496 return rc; 2497 } 2498 2499 /** 2500 * iscsi_eh_recover_target - reset target and possibly the session 2501 * @sc: scsi command 2502 * 2503 * This will attempt to send a warm target reset. If that fails, 2504 * we will escalate to ERL0 session recovery. 2505 */ 2506 int iscsi_eh_recover_target(struct scsi_cmnd *sc) 2507 { 2508 int rc; 2509 2510 rc = iscsi_eh_target_reset(sc); 2511 if (rc == FAILED) 2512 rc = iscsi_eh_session_reset(sc); 2513 return rc; 2514 } 2515 EXPORT_SYMBOL_GPL(iscsi_eh_recover_target); 2516 2517 /* 2518 * Pre-allocate a pool of @max items of @item_size. By default, the pool 2519 * should be accessed via kfifo_{get,put} on q->queue. 2520 * Optionally, the caller can obtain the array of object pointers 2521 * by passing in a non-NULL @items pointer 2522 */ 2523 int 2524 iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size) 2525 { 2526 int i, num_arrays = 1; 2527 2528 memset(q, 0, sizeof(*q)); 2529 2530 q->max = max; 2531 2532 /* If the user passed an items pointer, he wants a copy of 2533 * the array. */ 2534 if (items) 2535 num_arrays++; 2536 q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL); 2537 if (q->pool == NULL) 2538 return -ENOMEM; 2539 2540 kfifo_init(&q->queue, (void*)q->pool, max * sizeof(void*)); 2541 2542 for (i = 0; i < max; i++) { 2543 q->pool[i] = kzalloc(item_size, GFP_KERNEL); 2544 if (q->pool[i] == NULL) { 2545 q->max = i; 2546 goto enomem; 2547 } 2548 kfifo_in(&q->queue, (void*)&q->pool[i], sizeof(void*)); 2549 } 2550 2551 if (items) { 2552 *items = q->pool + max; 2553 memcpy(*items, q->pool, max * sizeof(void *)); 2554 } 2555 2556 return 0; 2557 2558 enomem: 2559 iscsi_pool_free(q); 2560 return -ENOMEM; 2561 } 2562 EXPORT_SYMBOL_GPL(iscsi_pool_init); 2563 2564 void iscsi_pool_free(struct iscsi_pool *q) 2565 { 2566 int i; 2567 2568 for (i = 0; i < q->max; i++) 2569 kfree(q->pool[i]); 2570 kfree(q->pool); 2571 } 2572 EXPORT_SYMBOL_GPL(iscsi_pool_free); 2573 2574 /** 2575 * iscsi_host_add - add host to system 2576 * @shost: scsi host 2577 * @pdev: parent device 2578 * 2579 * This should be called by partial offload and software iscsi drivers 2580 * to add a host to the system. 2581 */ 2582 int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev) 2583 { 2584 if (!shost->can_queue) 2585 shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX; 2586 2587 if (!shost->cmd_per_lun) 2588 shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN; 2589 2590 return scsi_add_host(shost, pdev); 2591 } 2592 EXPORT_SYMBOL_GPL(iscsi_host_add); 2593 2594 /** 2595 * iscsi_host_alloc - allocate a host and driver data 2596 * @sht: scsi host template 2597 * @dd_data_size: driver host data size 2598 * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue 2599 * 2600 * This should be called by partial offload and software iscsi drivers. 2601 * To access the driver specific memory use the iscsi_host_priv() macro. 2602 */ 2603 struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht, 2604 int dd_data_size, bool xmit_can_sleep) 2605 { 2606 struct Scsi_Host *shost; 2607 struct iscsi_host *ihost; 2608 2609 shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size); 2610 if (!shost) 2611 return NULL; 2612 ihost = shost_priv(shost); 2613 2614 if (xmit_can_sleep) { 2615 snprintf(ihost->workq_name, sizeof(ihost->workq_name), 2616 "iscsi_q_%d", shost->host_no); 2617 ihost->workq = create_singlethread_workqueue(ihost->workq_name); 2618 if (!ihost->workq) 2619 goto free_host; 2620 } 2621 2622 spin_lock_init(&ihost->lock); 2623 ihost->state = ISCSI_HOST_SETUP; 2624 ihost->num_sessions = 0; 2625 init_waitqueue_head(&ihost->session_removal_wq); 2626 return shost; 2627 2628 free_host: 2629 scsi_host_put(shost); 2630 return NULL; 2631 } 2632 EXPORT_SYMBOL_GPL(iscsi_host_alloc); 2633 2634 static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session) 2635 { 2636 iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST); 2637 } 2638 2639 /** 2640 * iscsi_host_remove - remove host and sessions 2641 * @shost: scsi host 2642 * 2643 * If there are any sessions left, this will initiate the removal and wait 2644 * for the completion. 2645 */ 2646 void iscsi_host_remove(struct Scsi_Host *shost) 2647 { 2648 struct iscsi_host *ihost = shost_priv(shost); 2649 unsigned long flags; 2650 2651 spin_lock_irqsave(&ihost->lock, flags); 2652 ihost->state = ISCSI_HOST_REMOVED; 2653 spin_unlock_irqrestore(&ihost->lock, flags); 2654 2655 iscsi_host_for_each_session(shost, iscsi_notify_host_removed); 2656 wait_event_interruptible(ihost->session_removal_wq, 2657 ihost->num_sessions == 0); 2658 if (signal_pending(current)) 2659 flush_signals(current); 2660 2661 scsi_remove_host(shost); 2662 if (ihost->workq) 2663 destroy_workqueue(ihost->workq); 2664 } 2665 EXPORT_SYMBOL_GPL(iscsi_host_remove); 2666 2667 void iscsi_host_free(struct Scsi_Host *shost) 2668 { 2669 struct iscsi_host *ihost = shost_priv(shost); 2670 2671 kfree(ihost->netdev); 2672 kfree(ihost->hwaddress); 2673 kfree(ihost->initiatorname); 2674 scsi_host_put(shost); 2675 } 2676 EXPORT_SYMBOL_GPL(iscsi_host_free); 2677 2678 static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost) 2679 { 2680 struct iscsi_host *ihost = shost_priv(shost); 2681 unsigned long flags; 2682 2683 shost = scsi_host_get(shost); 2684 if (!shost) { 2685 printk(KERN_ERR "Invalid state. Cannot notify host removal " 2686 "of session teardown event because host already " 2687 "removed.\n"); 2688 return; 2689 } 2690 2691 spin_lock_irqsave(&ihost->lock, flags); 2692 ihost->num_sessions--; 2693 if (ihost->num_sessions == 0) 2694 wake_up(&ihost->session_removal_wq); 2695 spin_unlock_irqrestore(&ihost->lock, flags); 2696 scsi_host_put(shost); 2697 } 2698 2699 /** 2700 * iscsi_session_setup - create iscsi cls session and host and session 2701 * @iscsit: iscsi transport template 2702 * @shost: scsi host 2703 * @cmds_max: session can queue 2704 * @cmd_task_size: LLD task private data size 2705 * @initial_cmdsn: initial CmdSN 2706 * 2707 * This can be used by software iscsi_transports that allocate 2708 * a session per scsi host. 2709 * 2710 * Callers should set cmds_max to the largest total numer (mgmt + scsi) of 2711 * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks 2712 * for nop handling and login/logout requests. 2713 */ 2714 struct iscsi_cls_session * 2715 iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost, 2716 uint16_t cmds_max, int dd_size, int cmd_task_size, 2717 uint32_t initial_cmdsn, unsigned int id) 2718 { 2719 struct iscsi_host *ihost = shost_priv(shost); 2720 struct iscsi_session *session; 2721 struct iscsi_cls_session *cls_session; 2722 int cmd_i, scsi_cmds, total_cmds = cmds_max; 2723 unsigned long flags; 2724 2725 spin_lock_irqsave(&ihost->lock, flags); 2726 if (ihost->state == ISCSI_HOST_REMOVED) { 2727 spin_unlock_irqrestore(&ihost->lock, flags); 2728 return NULL; 2729 } 2730 ihost->num_sessions++; 2731 spin_unlock_irqrestore(&ihost->lock, flags); 2732 2733 if (!total_cmds) 2734 total_cmds = ISCSI_DEF_XMIT_CMDS_MAX; 2735 /* 2736 * The iscsi layer needs some tasks for nop handling and tmfs, 2737 * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX 2738 * + 1 command for scsi IO. 2739 */ 2740 if (total_cmds < ISCSI_TOTAL_CMDS_MIN) { 2741 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " 2742 "must be a power of two that is at least %d.\n", 2743 total_cmds, ISCSI_TOTAL_CMDS_MIN); 2744 goto dec_session_count; 2745 } 2746 2747 if (total_cmds > ISCSI_TOTAL_CMDS_MAX) { 2748 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " 2749 "must be a power of 2 less than or equal to %d.\n", 2750 cmds_max, ISCSI_TOTAL_CMDS_MAX); 2751 total_cmds = ISCSI_TOTAL_CMDS_MAX; 2752 } 2753 2754 if (!is_power_of_2(total_cmds)) { 2755 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " 2756 "must be a power of 2.\n", total_cmds); 2757 total_cmds = rounddown_pow_of_two(total_cmds); 2758 if (total_cmds < ISCSI_TOTAL_CMDS_MIN) 2759 return NULL; 2760 printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n", 2761 total_cmds); 2762 } 2763 scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX; 2764 2765 cls_session = iscsi_alloc_session(shost, iscsit, 2766 sizeof(struct iscsi_session) + 2767 dd_size); 2768 if (!cls_session) 2769 goto dec_session_count; 2770 session = cls_session->dd_data; 2771 session->cls_session = cls_session; 2772 session->host = shost; 2773 session->state = ISCSI_STATE_FREE; 2774 session->fast_abort = 1; 2775 session->tgt_reset_timeout = 30; 2776 session->lu_reset_timeout = 15; 2777 session->abort_timeout = 10; 2778 session->scsi_cmds_max = scsi_cmds; 2779 session->cmds_max = total_cmds; 2780 session->queued_cmdsn = session->cmdsn = initial_cmdsn; 2781 session->exp_cmdsn = initial_cmdsn + 1; 2782 session->max_cmdsn = initial_cmdsn + 1; 2783 session->max_r2t = 1; 2784 session->tt = iscsit; 2785 session->dd_data = cls_session->dd_data + sizeof(*session); 2786 2787 mutex_init(&session->eh_mutex); 2788 spin_lock_init(&session->frwd_lock); 2789 spin_lock_init(&session->back_lock); 2790 2791 /* initialize SCSI PDU commands pool */ 2792 if (iscsi_pool_init(&session->cmdpool, session->cmds_max, 2793 (void***)&session->cmds, 2794 cmd_task_size + sizeof(struct iscsi_task))) 2795 goto cmdpool_alloc_fail; 2796 2797 /* pre-format cmds pool with ITT */ 2798 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { 2799 struct iscsi_task *task = session->cmds[cmd_i]; 2800 2801 if (cmd_task_size) 2802 task->dd_data = &task[1]; 2803 task->itt = cmd_i; 2804 task->state = ISCSI_TASK_FREE; 2805 INIT_LIST_HEAD(&task->running); 2806 } 2807 2808 if (!try_module_get(iscsit->owner)) 2809 goto module_get_fail; 2810 2811 if (iscsi_add_session(cls_session, id)) 2812 goto cls_session_fail; 2813 2814 return cls_session; 2815 2816 cls_session_fail: 2817 module_put(iscsit->owner); 2818 module_get_fail: 2819 iscsi_pool_free(&session->cmdpool); 2820 cmdpool_alloc_fail: 2821 iscsi_free_session(cls_session); 2822 dec_session_count: 2823 iscsi_host_dec_session_cnt(shost); 2824 return NULL; 2825 } 2826 EXPORT_SYMBOL_GPL(iscsi_session_setup); 2827 2828 /** 2829 * iscsi_session_teardown - destroy session, host, and cls_session 2830 * @cls_session: iscsi session 2831 * 2832 * The driver must have called iscsi_remove_session before 2833 * calling this. 2834 */ 2835 void iscsi_session_teardown(struct iscsi_cls_session *cls_session) 2836 { 2837 struct iscsi_session *session = cls_session->dd_data; 2838 struct module *owner = cls_session->transport->owner; 2839 struct Scsi_Host *shost = session->host; 2840 2841 iscsi_pool_free(&session->cmdpool); 2842 2843 kfree(session->password); 2844 kfree(session->password_in); 2845 kfree(session->username); 2846 kfree(session->username_in); 2847 kfree(session->targetname); 2848 kfree(session->targetalias); 2849 kfree(session->initiatorname); 2850 kfree(session->boot_root); 2851 kfree(session->boot_nic); 2852 kfree(session->boot_target); 2853 kfree(session->ifacename); 2854 kfree(session->portal_type); 2855 kfree(session->discovery_parent_type); 2856 2857 iscsi_destroy_session(cls_session); 2858 iscsi_host_dec_session_cnt(shost); 2859 module_put(owner); 2860 } 2861 EXPORT_SYMBOL_GPL(iscsi_session_teardown); 2862 2863 /** 2864 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn 2865 * @cls_session: iscsi_cls_session 2866 * @dd_size: private driver data size 2867 * @conn_idx: cid 2868 */ 2869 struct iscsi_cls_conn * 2870 iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size, 2871 uint32_t conn_idx) 2872 { 2873 struct iscsi_session *session = cls_session->dd_data; 2874 struct iscsi_conn *conn; 2875 struct iscsi_cls_conn *cls_conn; 2876 char *data; 2877 2878 cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size, 2879 conn_idx); 2880 if (!cls_conn) 2881 return NULL; 2882 conn = cls_conn->dd_data; 2883 memset(conn, 0, sizeof(*conn) + dd_size); 2884 2885 conn->dd_data = cls_conn->dd_data + sizeof(*conn); 2886 conn->session = session; 2887 conn->cls_conn = cls_conn; 2888 conn->c_stage = ISCSI_CONN_INITIAL_STAGE; 2889 conn->id = conn_idx; 2890 conn->exp_statsn = 0; 2891 conn->tmf_state = TMF_INITIAL; 2892 2893 init_timer(&conn->transport_timer); 2894 conn->transport_timer.data = (unsigned long)conn; 2895 conn->transport_timer.function = iscsi_check_transport_timeouts; 2896 2897 INIT_LIST_HEAD(&conn->mgmtqueue); 2898 INIT_LIST_HEAD(&conn->cmdqueue); 2899 INIT_LIST_HEAD(&conn->requeue); 2900 INIT_WORK(&conn->xmitwork, iscsi_xmitworker); 2901 2902 /* allocate login_task used for the login/text sequences */ 2903 spin_lock_bh(&session->frwd_lock); 2904 if (!kfifo_out(&session->cmdpool.queue, 2905 (void*)&conn->login_task, 2906 sizeof(void*))) { 2907 spin_unlock_bh(&session->frwd_lock); 2908 goto login_task_alloc_fail; 2909 } 2910 spin_unlock_bh(&session->frwd_lock); 2911 2912 data = (char *) __get_free_pages(GFP_KERNEL, 2913 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); 2914 if (!data) 2915 goto login_task_data_alloc_fail; 2916 conn->login_task->data = conn->data = data; 2917 2918 init_timer(&conn->tmf_timer); 2919 init_waitqueue_head(&conn->ehwait); 2920 2921 return cls_conn; 2922 2923 login_task_data_alloc_fail: 2924 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task, 2925 sizeof(void*)); 2926 login_task_alloc_fail: 2927 iscsi_destroy_conn(cls_conn); 2928 return NULL; 2929 } 2930 EXPORT_SYMBOL_GPL(iscsi_conn_setup); 2931 2932 /** 2933 * iscsi_conn_teardown - teardown iscsi connection 2934 * cls_conn: iscsi class connection 2935 * 2936 * TODO: we may need to make this into a two step process 2937 * like scsi-mls remove + put host 2938 */ 2939 void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) 2940 { 2941 struct iscsi_conn *conn = cls_conn->dd_data; 2942 struct iscsi_session *session = conn->session; 2943 2944 del_timer_sync(&conn->transport_timer); 2945 2946 mutex_lock(&session->eh_mutex); 2947 spin_lock_bh(&session->frwd_lock); 2948 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT; 2949 if (session->leadconn == conn) { 2950 /* 2951 * leading connection? then give up on recovery. 2952 */ 2953 session->state = ISCSI_STATE_TERMINATE; 2954 wake_up(&conn->ehwait); 2955 } 2956 spin_unlock_bh(&session->frwd_lock); 2957 2958 /* flush queued up work because we free the connection below */ 2959 iscsi_suspend_tx(conn); 2960 2961 spin_lock_bh(&session->frwd_lock); 2962 free_pages((unsigned long) conn->data, 2963 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); 2964 kfree(conn->persistent_address); 2965 kfree(conn->local_ipaddr); 2966 /* regular RX path uses back_lock */ 2967 spin_lock_bh(&session->back_lock); 2968 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task, 2969 sizeof(void*)); 2970 spin_unlock_bh(&session->back_lock); 2971 if (session->leadconn == conn) 2972 session->leadconn = NULL; 2973 spin_unlock_bh(&session->frwd_lock); 2974 mutex_unlock(&session->eh_mutex); 2975 2976 iscsi_destroy_conn(cls_conn); 2977 } 2978 EXPORT_SYMBOL_GPL(iscsi_conn_teardown); 2979 2980 int iscsi_conn_start(struct iscsi_cls_conn *cls_conn) 2981 { 2982 struct iscsi_conn *conn = cls_conn->dd_data; 2983 struct iscsi_session *session = conn->session; 2984 2985 if (!session) { 2986 iscsi_conn_printk(KERN_ERR, conn, 2987 "can't start unbound connection\n"); 2988 return -EPERM; 2989 } 2990 2991 if ((session->imm_data_en || !session->initial_r2t_en) && 2992 session->first_burst > session->max_burst) { 2993 iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: " 2994 "first_burst %d max_burst %d\n", 2995 session->first_burst, session->max_burst); 2996 return -EINVAL; 2997 } 2998 2999 if (conn->ping_timeout && !conn->recv_timeout) { 3000 iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of " 3001 "zero. Using 5 seconds\n."); 3002 conn->recv_timeout = 5; 3003 } 3004 3005 if (conn->recv_timeout && !conn->ping_timeout) { 3006 iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of " 3007 "zero. Using 5 seconds.\n"); 3008 conn->ping_timeout = 5; 3009 } 3010 3011 spin_lock_bh(&session->frwd_lock); 3012 conn->c_stage = ISCSI_CONN_STARTED; 3013 session->state = ISCSI_STATE_LOGGED_IN; 3014 session->queued_cmdsn = session->cmdsn; 3015 3016 conn->last_recv = jiffies; 3017 conn->last_ping = jiffies; 3018 if (conn->recv_timeout && conn->ping_timeout) 3019 mod_timer(&conn->transport_timer, 3020 jiffies + (conn->recv_timeout * HZ)); 3021 3022 switch(conn->stop_stage) { 3023 case STOP_CONN_RECOVER: 3024 /* 3025 * unblock eh_abort() if it is blocked. re-try all 3026 * commands after successful recovery 3027 */ 3028 conn->stop_stage = 0; 3029 conn->tmf_state = TMF_INITIAL; 3030 session->age++; 3031 if (session->age == 16) 3032 session->age = 0; 3033 break; 3034 case STOP_CONN_TERM: 3035 conn->stop_stage = 0; 3036 break; 3037 default: 3038 break; 3039 } 3040 spin_unlock_bh(&session->frwd_lock); 3041 3042 iscsi_unblock_session(session->cls_session); 3043 wake_up(&conn->ehwait); 3044 return 0; 3045 } 3046 EXPORT_SYMBOL_GPL(iscsi_conn_start); 3047 3048 static void 3049 fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn) 3050 { 3051 struct iscsi_task *task; 3052 int i, state; 3053 3054 for (i = 0; i < conn->session->cmds_max; i++) { 3055 task = conn->session->cmds[i]; 3056 if (task->sc) 3057 continue; 3058 3059 if (task->state == ISCSI_TASK_FREE) 3060 continue; 3061 3062 ISCSI_DBG_SESSION(conn->session, 3063 "failing mgmt itt 0x%x state %d\n", 3064 task->itt, task->state); 3065 state = ISCSI_TASK_ABRT_SESS_RECOV; 3066 if (task->state == ISCSI_TASK_PENDING) 3067 state = ISCSI_TASK_COMPLETED; 3068 iscsi_complete_task(task, state); 3069 3070 } 3071 } 3072 3073 static void iscsi_start_session_recovery(struct iscsi_session *session, 3074 struct iscsi_conn *conn, int flag) 3075 { 3076 int old_stop_stage; 3077 3078 mutex_lock(&session->eh_mutex); 3079 spin_lock_bh(&session->frwd_lock); 3080 if (conn->stop_stage == STOP_CONN_TERM) { 3081 spin_unlock_bh(&session->frwd_lock); 3082 mutex_unlock(&session->eh_mutex); 3083 return; 3084 } 3085 3086 /* 3087 * When this is called for the in_login state, we only want to clean 3088 * up the login task and connection. We do not need to block and set 3089 * the recovery state again 3090 */ 3091 if (flag == STOP_CONN_TERM) 3092 session->state = ISCSI_STATE_TERMINATE; 3093 else if (conn->stop_stage != STOP_CONN_RECOVER) 3094 session->state = ISCSI_STATE_IN_RECOVERY; 3095 3096 old_stop_stage = conn->stop_stage; 3097 conn->stop_stage = flag; 3098 spin_unlock_bh(&session->frwd_lock); 3099 3100 del_timer_sync(&conn->transport_timer); 3101 iscsi_suspend_tx(conn); 3102 3103 spin_lock_bh(&session->frwd_lock); 3104 conn->c_stage = ISCSI_CONN_STOPPED; 3105 spin_unlock_bh(&session->frwd_lock); 3106 3107 /* 3108 * for connection level recovery we should not calculate 3109 * header digest. conn->hdr_size used for optimization 3110 * in hdr_extract() and will be re-negotiated at 3111 * set_param() time. 3112 */ 3113 if (flag == STOP_CONN_RECOVER) { 3114 conn->hdrdgst_en = 0; 3115 conn->datadgst_en = 0; 3116 if (session->state == ISCSI_STATE_IN_RECOVERY && 3117 old_stop_stage != STOP_CONN_RECOVER) { 3118 ISCSI_DBG_SESSION(session, "blocking session\n"); 3119 iscsi_block_session(session->cls_session); 3120 } 3121 } 3122 3123 /* 3124 * flush queues. 3125 */ 3126 spin_lock_bh(&session->frwd_lock); 3127 fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED); 3128 fail_mgmt_tasks(session, conn); 3129 memset(&conn->tmhdr, 0, sizeof(conn->tmhdr)); 3130 spin_unlock_bh(&session->frwd_lock); 3131 mutex_unlock(&session->eh_mutex); 3132 } 3133 3134 void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) 3135 { 3136 struct iscsi_conn *conn = cls_conn->dd_data; 3137 struct iscsi_session *session = conn->session; 3138 3139 switch (flag) { 3140 case STOP_CONN_RECOVER: 3141 case STOP_CONN_TERM: 3142 iscsi_start_session_recovery(session, conn, flag); 3143 break; 3144 default: 3145 iscsi_conn_printk(KERN_ERR, conn, 3146 "invalid stop flag %d\n", flag); 3147 } 3148 } 3149 EXPORT_SYMBOL_GPL(iscsi_conn_stop); 3150 3151 int iscsi_conn_bind(struct iscsi_cls_session *cls_session, 3152 struct iscsi_cls_conn *cls_conn, int is_leading) 3153 { 3154 struct iscsi_session *session = cls_session->dd_data; 3155 struct iscsi_conn *conn = cls_conn->dd_data; 3156 3157 spin_lock_bh(&session->frwd_lock); 3158 if (is_leading) 3159 session->leadconn = conn; 3160 spin_unlock_bh(&session->frwd_lock); 3161 3162 /* 3163 * Unblock xmitworker(), Login Phase will pass through. 3164 */ 3165 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); 3166 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); 3167 return 0; 3168 } 3169 EXPORT_SYMBOL_GPL(iscsi_conn_bind); 3170 3171 int iscsi_switch_str_param(char **param, char *new_val_buf) 3172 { 3173 char *new_val; 3174 3175 if (*param) { 3176 if (!strcmp(*param, new_val_buf)) 3177 return 0; 3178 } 3179 3180 new_val = kstrdup(new_val_buf, GFP_NOIO); 3181 if (!new_val) 3182 return -ENOMEM; 3183 3184 kfree(*param); 3185 *param = new_val; 3186 return 0; 3187 } 3188 EXPORT_SYMBOL_GPL(iscsi_switch_str_param); 3189 3190 int iscsi_set_param(struct iscsi_cls_conn *cls_conn, 3191 enum iscsi_param param, char *buf, int buflen) 3192 { 3193 struct iscsi_conn *conn = cls_conn->dd_data; 3194 struct iscsi_session *session = conn->session; 3195 int val; 3196 3197 switch(param) { 3198 case ISCSI_PARAM_FAST_ABORT: 3199 sscanf(buf, "%d", &session->fast_abort); 3200 break; 3201 case ISCSI_PARAM_ABORT_TMO: 3202 sscanf(buf, "%d", &session->abort_timeout); 3203 break; 3204 case ISCSI_PARAM_LU_RESET_TMO: 3205 sscanf(buf, "%d", &session->lu_reset_timeout); 3206 break; 3207 case ISCSI_PARAM_TGT_RESET_TMO: 3208 sscanf(buf, "%d", &session->tgt_reset_timeout); 3209 break; 3210 case ISCSI_PARAM_PING_TMO: 3211 sscanf(buf, "%d", &conn->ping_timeout); 3212 break; 3213 case ISCSI_PARAM_RECV_TMO: 3214 sscanf(buf, "%d", &conn->recv_timeout); 3215 break; 3216 case ISCSI_PARAM_MAX_RECV_DLENGTH: 3217 sscanf(buf, "%d", &conn->max_recv_dlength); 3218 break; 3219 case ISCSI_PARAM_MAX_XMIT_DLENGTH: 3220 sscanf(buf, "%d", &conn->max_xmit_dlength); 3221 break; 3222 case ISCSI_PARAM_HDRDGST_EN: 3223 sscanf(buf, "%d", &conn->hdrdgst_en); 3224 break; 3225 case ISCSI_PARAM_DATADGST_EN: 3226 sscanf(buf, "%d", &conn->datadgst_en); 3227 break; 3228 case ISCSI_PARAM_INITIAL_R2T_EN: 3229 sscanf(buf, "%d", &session->initial_r2t_en); 3230 break; 3231 case ISCSI_PARAM_MAX_R2T: 3232 sscanf(buf, "%hu", &session->max_r2t); 3233 break; 3234 case ISCSI_PARAM_IMM_DATA_EN: 3235 sscanf(buf, "%d", &session->imm_data_en); 3236 break; 3237 case ISCSI_PARAM_FIRST_BURST: 3238 sscanf(buf, "%d", &session->first_burst); 3239 break; 3240 case ISCSI_PARAM_MAX_BURST: 3241 sscanf(buf, "%d", &session->max_burst); 3242 break; 3243 case ISCSI_PARAM_PDU_INORDER_EN: 3244 sscanf(buf, "%d", &session->pdu_inorder_en); 3245 break; 3246 case ISCSI_PARAM_DATASEQ_INORDER_EN: 3247 sscanf(buf, "%d", &session->dataseq_inorder_en); 3248 break; 3249 case ISCSI_PARAM_ERL: 3250 sscanf(buf, "%d", &session->erl); 3251 break; 3252 case ISCSI_PARAM_EXP_STATSN: 3253 sscanf(buf, "%u", &conn->exp_statsn); 3254 break; 3255 case ISCSI_PARAM_USERNAME: 3256 return iscsi_switch_str_param(&session->username, buf); 3257 case ISCSI_PARAM_USERNAME_IN: 3258 return iscsi_switch_str_param(&session->username_in, buf); 3259 case ISCSI_PARAM_PASSWORD: 3260 return iscsi_switch_str_param(&session->password, buf); 3261 case ISCSI_PARAM_PASSWORD_IN: 3262 return iscsi_switch_str_param(&session->password_in, buf); 3263 case ISCSI_PARAM_TARGET_NAME: 3264 return iscsi_switch_str_param(&session->targetname, buf); 3265 case ISCSI_PARAM_TARGET_ALIAS: 3266 return iscsi_switch_str_param(&session->targetalias, buf); 3267 case ISCSI_PARAM_TPGT: 3268 sscanf(buf, "%d", &session->tpgt); 3269 break; 3270 case ISCSI_PARAM_PERSISTENT_PORT: 3271 sscanf(buf, "%d", &conn->persistent_port); 3272 break; 3273 case ISCSI_PARAM_PERSISTENT_ADDRESS: 3274 return iscsi_switch_str_param(&conn->persistent_address, buf); 3275 case ISCSI_PARAM_IFACE_NAME: 3276 return iscsi_switch_str_param(&session->ifacename, buf); 3277 case ISCSI_PARAM_INITIATOR_NAME: 3278 return iscsi_switch_str_param(&session->initiatorname, buf); 3279 case ISCSI_PARAM_BOOT_ROOT: 3280 return iscsi_switch_str_param(&session->boot_root, buf); 3281 case ISCSI_PARAM_BOOT_NIC: 3282 return iscsi_switch_str_param(&session->boot_nic, buf); 3283 case ISCSI_PARAM_BOOT_TARGET: 3284 return iscsi_switch_str_param(&session->boot_target, buf); 3285 case ISCSI_PARAM_PORTAL_TYPE: 3286 return iscsi_switch_str_param(&session->portal_type, buf); 3287 case ISCSI_PARAM_DISCOVERY_PARENT_TYPE: 3288 return iscsi_switch_str_param(&session->discovery_parent_type, 3289 buf); 3290 case ISCSI_PARAM_DISCOVERY_SESS: 3291 sscanf(buf, "%d", &val); 3292 session->discovery_sess = !!val; 3293 break; 3294 case ISCSI_PARAM_LOCAL_IPADDR: 3295 return iscsi_switch_str_param(&conn->local_ipaddr, buf); 3296 default: 3297 return -ENOSYS; 3298 } 3299 3300 return 0; 3301 } 3302 EXPORT_SYMBOL_GPL(iscsi_set_param); 3303 3304 int iscsi_session_get_param(struct iscsi_cls_session *cls_session, 3305 enum iscsi_param param, char *buf) 3306 { 3307 struct iscsi_session *session = cls_session->dd_data; 3308 int len; 3309 3310 switch(param) { 3311 case ISCSI_PARAM_FAST_ABORT: 3312 len = sprintf(buf, "%d\n", session->fast_abort); 3313 break; 3314 case ISCSI_PARAM_ABORT_TMO: 3315 len = sprintf(buf, "%d\n", session->abort_timeout); 3316 break; 3317 case ISCSI_PARAM_LU_RESET_TMO: 3318 len = sprintf(buf, "%d\n", session->lu_reset_timeout); 3319 break; 3320 case ISCSI_PARAM_TGT_RESET_TMO: 3321 len = sprintf(buf, "%d\n", session->tgt_reset_timeout); 3322 break; 3323 case ISCSI_PARAM_INITIAL_R2T_EN: 3324 len = sprintf(buf, "%d\n", session->initial_r2t_en); 3325 break; 3326 case ISCSI_PARAM_MAX_R2T: 3327 len = sprintf(buf, "%hu\n", session->max_r2t); 3328 break; 3329 case ISCSI_PARAM_IMM_DATA_EN: 3330 len = sprintf(buf, "%d\n", session->imm_data_en); 3331 break; 3332 case ISCSI_PARAM_FIRST_BURST: 3333 len = sprintf(buf, "%u\n", session->first_burst); 3334 break; 3335 case ISCSI_PARAM_MAX_BURST: 3336 len = sprintf(buf, "%u\n", session->max_burst); 3337 break; 3338 case ISCSI_PARAM_PDU_INORDER_EN: 3339 len = sprintf(buf, "%d\n", session->pdu_inorder_en); 3340 break; 3341 case ISCSI_PARAM_DATASEQ_INORDER_EN: 3342 len = sprintf(buf, "%d\n", session->dataseq_inorder_en); 3343 break; 3344 case ISCSI_PARAM_DEF_TASKMGMT_TMO: 3345 len = sprintf(buf, "%d\n", session->def_taskmgmt_tmo); 3346 break; 3347 case ISCSI_PARAM_ERL: 3348 len = sprintf(buf, "%d\n", session->erl); 3349 break; 3350 case ISCSI_PARAM_TARGET_NAME: 3351 len = sprintf(buf, "%s\n", session->targetname); 3352 break; 3353 case ISCSI_PARAM_TARGET_ALIAS: 3354 len = sprintf(buf, "%s\n", session->targetalias); 3355 break; 3356 case ISCSI_PARAM_TPGT: 3357 len = sprintf(buf, "%d\n", session->tpgt); 3358 break; 3359 case ISCSI_PARAM_USERNAME: 3360 len = sprintf(buf, "%s\n", session->username); 3361 break; 3362 case ISCSI_PARAM_USERNAME_IN: 3363 len = sprintf(buf, "%s\n", session->username_in); 3364 break; 3365 case ISCSI_PARAM_PASSWORD: 3366 len = sprintf(buf, "%s\n", session->password); 3367 break; 3368 case ISCSI_PARAM_PASSWORD_IN: 3369 len = sprintf(buf, "%s\n", session->password_in); 3370 break; 3371 case ISCSI_PARAM_IFACE_NAME: 3372 len = sprintf(buf, "%s\n", session->ifacename); 3373 break; 3374 case ISCSI_PARAM_INITIATOR_NAME: 3375 len = sprintf(buf, "%s\n", session->initiatorname); 3376 break; 3377 case ISCSI_PARAM_BOOT_ROOT: 3378 len = sprintf(buf, "%s\n", session->boot_root); 3379 break; 3380 case ISCSI_PARAM_BOOT_NIC: 3381 len = sprintf(buf, "%s\n", session->boot_nic); 3382 break; 3383 case ISCSI_PARAM_BOOT_TARGET: 3384 len = sprintf(buf, "%s\n", session->boot_target); 3385 break; 3386 case ISCSI_PARAM_AUTO_SND_TGT_DISABLE: 3387 len = sprintf(buf, "%u\n", session->auto_snd_tgt_disable); 3388 break; 3389 case ISCSI_PARAM_DISCOVERY_SESS: 3390 len = sprintf(buf, "%u\n", session->discovery_sess); 3391 break; 3392 case ISCSI_PARAM_PORTAL_TYPE: 3393 len = sprintf(buf, "%s\n", session->portal_type); 3394 break; 3395 case ISCSI_PARAM_CHAP_AUTH_EN: 3396 len = sprintf(buf, "%u\n", session->chap_auth_en); 3397 break; 3398 case ISCSI_PARAM_DISCOVERY_LOGOUT_EN: 3399 len = sprintf(buf, "%u\n", session->discovery_logout_en); 3400 break; 3401 case ISCSI_PARAM_BIDI_CHAP_EN: 3402 len = sprintf(buf, "%u\n", session->bidi_chap_en); 3403 break; 3404 case ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL: 3405 len = sprintf(buf, "%u\n", session->discovery_auth_optional); 3406 break; 3407 case ISCSI_PARAM_DEF_TIME2WAIT: 3408 len = sprintf(buf, "%d\n", session->time2wait); 3409 break; 3410 case ISCSI_PARAM_DEF_TIME2RETAIN: 3411 len = sprintf(buf, "%d\n", session->time2retain); 3412 break; 3413 case ISCSI_PARAM_TSID: 3414 len = sprintf(buf, "%u\n", session->tsid); 3415 break; 3416 case ISCSI_PARAM_ISID: 3417 len = sprintf(buf, "%02x%02x%02x%02x%02x%02x\n", 3418 session->isid[0], session->isid[1], 3419 session->isid[2], session->isid[3], 3420 session->isid[4], session->isid[5]); 3421 break; 3422 case ISCSI_PARAM_DISCOVERY_PARENT_IDX: 3423 len = sprintf(buf, "%u\n", session->discovery_parent_idx); 3424 break; 3425 case ISCSI_PARAM_DISCOVERY_PARENT_TYPE: 3426 if (session->discovery_parent_type) 3427 len = sprintf(buf, "%s\n", 3428 session->discovery_parent_type); 3429 else 3430 len = sprintf(buf, "\n"); 3431 break; 3432 default: 3433 return -ENOSYS; 3434 } 3435 3436 return len; 3437 } 3438 EXPORT_SYMBOL_GPL(iscsi_session_get_param); 3439 3440 int iscsi_conn_get_addr_param(struct sockaddr_storage *addr, 3441 enum iscsi_param param, char *buf) 3442 { 3443 struct sockaddr_in6 *sin6 = NULL; 3444 struct sockaddr_in *sin = NULL; 3445 int len; 3446 3447 switch (addr->ss_family) { 3448 case AF_INET: 3449 sin = (struct sockaddr_in *)addr; 3450 break; 3451 case AF_INET6: 3452 sin6 = (struct sockaddr_in6 *)addr; 3453 break; 3454 default: 3455 return -EINVAL; 3456 } 3457 3458 switch (param) { 3459 case ISCSI_PARAM_CONN_ADDRESS: 3460 case ISCSI_HOST_PARAM_IPADDRESS: 3461 if (sin) 3462 len = sprintf(buf, "%pI4\n", &sin->sin_addr.s_addr); 3463 else 3464 len = sprintf(buf, "%pI6\n", &sin6->sin6_addr); 3465 break; 3466 case ISCSI_PARAM_CONN_PORT: 3467 case ISCSI_PARAM_LOCAL_PORT: 3468 if (sin) 3469 len = sprintf(buf, "%hu\n", be16_to_cpu(sin->sin_port)); 3470 else 3471 len = sprintf(buf, "%hu\n", 3472 be16_to_cpu(sin6->sin6_port)); 3473 break; 3474 default: 3475 return -EINVAL; 3476 } 3477 3478 return len; 3479 } 3480 EXPORT_SYMBOL_GPL(iscsi_conn_get_addr_param); 3481 3482 int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, 3483 enum iscsi_param param, char *buf) 3484 { 3485 struct iscsi_conn *conn = cls_conn->dd_data; 3486 int len; 3487 3488 switch(param) { 3489 case ISCSI_PARAM_PING_TMO: 3490 len = sprintf(buf, "%u\n", conn->ping_timeout); 3491 break; 3492 case ISCSI_PARAM_RECV_TMO: 3493 len = sprintf(buf, "%u\n", conn->recv_timeout); 3494 break; 3495 case ISCSI_PARAM_MAX_RECV_DLENGTH: 3496 len = sprintf(buf, "%u\n", conn->max_recv_dlength); 3497 break; 3498 case ISCSI_PARAM_MAX_XMIT_DLENGTH: 3499 len = sprintf(buf, "%u\n", conn->max_xmit_dlength); 3500 break; 3501 case ISCSI_PARAM_HDRDGST_EN: 3502 len = sprintf(buf, "%d\n", conn->hdrdgst_en); 3503 break; 3504 case ISCSI_PARAM_DATADGST_EN: 3505 len = sprintf(buf, "%d\n", conn->datadgst_en); 3506 break; 3507 case ISCSI_PARAM_IFMARKER_EN: 3508 len = sprintf(buf, "%d\n", conn->ifmarker_en); 3509 break; 3510 case ISCSI_PARAM_OFMARKER_EN: 3511 len = sprintf(buf, "%d\n", conn->ofmarker_en); 3512 break; 3513 case ISCSI_PARAM_EXP_STATSN: 3514 len = sprintf(buf, "%u\n", conn->exp_statsn); 3515 break; 3516 case ISCSI_PARAM_PERSISTENT_PORT: 3517 len = sprintf(buf, "%d\n", conn->persistent_port); 3518 break; 3519 case ISCSI_PARAM_PERSISTENT_ADDRESS: 3520 len = sprintf(buf, "%s\n", conn->persistent_address); 3521 break; 3522 case ISCSI_PARAM_STATSN: 3523 len = sprintf(buf, "%u\n", conn->statsn); 3524 break; 3525 case ISCSI_PARAM_MAX_SEGMENT_SIZE: 3526 len = sprintf(buf, "%u\n", conn->max_segment_size); 3527 break; 3528 case ISCSI_PARAM_KEEPALIVE_TMO: 3529 len = sprintf(buf, "%u\n", conn->keepalive_tmo); 3530 break; 3531 case ISCSI_PARAM_LOCAL_PORT: 3532 len = sprintf(buf, "%u\n", conn->local_port); 3533 break; 3534 case ISCSI_PARAM_TCP_TIMESTAMP_STAT: 3535 len = sprintf(buf, "%u\n", conn->tcp_timestamp_stat); 3536 break; 3537 case ISCSI_PARAM_TCP_NAGLE_DISABLE: 3538 len = sprintf(buf, "%u\n", conn->tcp_nagle_disable); 3539 break; 3540 case ISCSI_PARAM_TCP_WSF_DISABLE: 3541 len = sprintf(buf, "%u\n", conn->tcp_wsf_disable); 3542 break; 3543 case ISCSI_PARAM_TCP_TIMER_SCALE: 3544 len = sprintf(buf, "%u\n", conn->tcp_timer_scale); 3545 break; 3546 case ISCSI_PARAM_TCP_TIMESTAMP_EN: 3547 len = sprintf(buf, "%u\n", conn->tcp_timestamp_en); 3548 break; 3549 case ISCSI_PARAM_IP_FRAGMENT_DISABLE: 3550 len = sprintf(buf, "%u\n", conn->fragment_disable); 3551 break; 3552 case ISCSI_PARAM_IPV4_TOS: 3553 len = sprintf(buf, "%u\n", conn->ipv4_tos); 3554 break; 3555 case ISCSI_PARAM_IPV6_TC: 3556 len = sprintf(buf, "%u\n", conn->ipv6_traffic_class); 3557 break; 3558 case ISCSI_PARAM_IPV6_FLOW_LABEL: 3559 len = sprintf(buf, "%u\n", conn->ipv6_flow_label); 3560 break; 3561 case ISCSI_PARAM_IS_FW_ASSIGNED_IPV6: 3562 len = sprintf(buf, "%u\n", conn->is_fw_assigned_ipv6); 3563 break; 3564 case ISCSI_PARAM_TCP_XMIT_WSF: 3565 len = sprintf(buf, "%u\n", conn->tcp_xmit_wsf); 3566 break; 3567 case ISCSI_PARAM_TCP_RECV_WSF: 3568 len = sprintf(buf, "%u\n", conn->tcp_recv_wsf); 3569 break; 3570 case ISCSI_PARAM_LOCAL_IPADDR: 3571 len = sprintf(buf, "%s\n", conn->local_ipaddr); 3572 break; 3573 default: 3574 return -ENOSYS; 3575 } 3576 3577 return len; 3578 } 3579 EXPORT_SYMBOL_GPL(iscsi_conn_get_param); 3580 3581 int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param, 3582 char *buf) 3583 { 3584 struct iscsi_host *ihost = shost_priv(shost); 3585 int len; 3586 3587 switch (param) { 3588 case ISCSI_HOST_PARAM_NETDEV_NAME: 3589 len = sprintf(buf, "%s\n", ihost->netdev); 3590 break; 3591 case ISCSI_HOST_PARAM_HWADDRESS: 3592 len = sprintf(buf, "%s\n", ihost->hwaddress); 3593 break; 3594 case ISCSI_HOST_PARAM_INITIATOR_NAME: 3595 len = sprintf(buf, "%s\n", ihost->initiatorname); 3596 break; 3597 default: 3598 return -ENOSYS; 3599 } 3600 3601 return len; 3602 } 3603 EXPORT_SYMBOL_GPL(iscsi_host_get_param); 3604 3605 int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param, 3606 char *buf, int buflen) 3607 { 3608 struct iscsi_host *ihost = shost_priv(shost); 3609 3610 switch (param) { 3611 case ISCSI_HOST_PARAM_NETDEV_NAME: 3612 return iscsi_switch_str_param(&ihost->netdev, buf); 3613 case ISCSI_HOST_PARAM_HWADDRESS: 3614 return iscsi_switch_str_param(&ihost->hwaddress, buf); 3615 case ISCSI_HOST_PARAM_INITIATOR_NAME: 3616 return iscsi_switch_str_param(&ihost->initiatorname, buf); 3617 default: 3618 return -ENOSYS; 3619 } 3620 3621 return 0; 3622 } 3623 EXPORT_SYMBOL_GPL(iscsi_host_set_param); 3624 3625 MODULE_AUTHOR("Mike Christie"); 3626 MODULE_DESCRIPTION("iSCSI library functions"); 3627 MODULE_LICENSE("GPL"); 3628