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