1 /* 2 * iSCSI lib functions 3 * 4 * Copyright (C) 2006 Red Hat, Inc. All rights reserved. 5 * Copyright (C) 2004 - 2006 Mike Christie 6 * Copyright (C) 2004 - 2005 Dmitry Yusupov 7 * Copyright (C) 2004 - 2005 Alex Aizman 8 * maintained by open-iscsi@googlegroups.com 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; if not, write to the Free Software 22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 23 */ 24 #include <linux/types.h> 25 #include <linux/kfifo.h> 26 #include <linux/delay.h> 27 #include <linux/log2.h> 28 #include <linux/slab.h> 29 #include <linux/sched/signal.h> 30 #include <linux/module.h> 31 #include <asm/unaligned.h> 32 #include <net/tcp.h> 33 #include <scsi/scsi_cmnd.h> 34 #include <scsi/scsi_device.h> 35 #include <scsi/scsi_eh.h> 36 #include <scsi/scsi_tcq.h> 37 #include <scsi/scsi_host.h> 38 #include <scsi/scsi.h> 39 #include <scsi/iscsi_proto.h> 40 #include <scsi/scsi_transport.h> 41 #include <scsi/scsi_transport_iscsi.h> 42 #include <scsi/libiscsi.h> 43 #include <trace/events/iscsi.h> 44 45 static int iscsi_dbg_lib_conn; 46 module_param_named(debug_libiscsi_conn, iscsi_dbg_lib_conn, int, 47 S_IRUGO | S_IWUSR); 48 MODULE_PARM_DESC(debug_libiscsi_conn, 49 "Turn on debugging for connections in libiscsi module. " 50 "Set to 1 to turn on, and zero to turn off. Default is off."); 51 52 static int iscsi_dbg_lib_session; 53 module_param_named(debug_libiscsi_session, iscsi_dbg_lib_session, int, 54 S_IRUGO | S_IWUSR); 55 MODULE_PARM_DESC(debug_libiscsi_session, 56 "Turn on debugging for sessions in libiscsi module. " 57 "Set to 1 to turn on, and zero to turn off. Default is off."); 58 59 static int iscsi_dbg_lib_eh; 60 module_param_named(debug_libiscsi_eh, iscsi_dbg_lib_eh, int, 61 S_IRUGO | S_IWUSR); 62 MODULE_PARM_DESC(debug_libiscsi_eh, 63 "Turn on debugging for error handling in libiscsi module. " 64 "Set to 1 to turn on, and zero to turn off. Default is off."); 65 66 #define ISCSI_DBG_CONN(_conn, dbg_fmt, arg...) \ 67 do { \ 68 if (iscsi_dbg_lib_conn) \ 69 iscsi_conn_printk(KERN_INFO, _conn, \ 70 "%s " dbg_fmt, \ 71 __func__, ##arg); \ 72 iscsi_dbg_trace(trace_iscsi_dbg_conn, \ 73 &(_conn)->cls_conn->dev, \ 74 "%s " dbg_fmt, __func__, ##arg);\ 75 } while (0); 76 77 #define ISCSI_DBG_SESSION(_session, dbg_fmt, arg...) \ 78 do { \ 79 if (iscsi_dbg_lib_session) \ 80 iscsi_session_printk(KERN_INFO, _session, \ 81 "%s " dbg_fmt, \ 82 __func__, ##arg); \ 83 iscsi_dbg_trace(trace_iscsi_dbg_session, \ 84 &(_session)->cls_session->dev, \ 85 "%s " dbg_fmt, __func__, ##arg); \ 86 } while (0); 87 88 #define ISCSI_DBG_EH(_session, dbg_fmt, arg...) \ 89 do { \ 90 if (iscsi_dbg_lib_eh) \ 91 iscsi_session_printk(KERN_INFO, _session, \ 92 "%s " dbg_fmt, \ 93 __func__, ##arg); \ 94 iscsi_dbg_trace(trace_iscsi_dbg_eh, \ 95 &(_session)->cls_session->dev, \ 96 "%s " dbg_fmt, __func__, ##arg); \ 97 } while (0); 98 99 inline void iscsi_conn_queue_work(struct iscsi_conn *conn) 100 { 101 struct Scsi_Host *shost = conn->session->host; 102 struct iscsi_host *ihost = shost_priv(shost); 103 104 if (ihost->workq) 105 queue_work(ihost->workq, &conn->xmitwork); 106 } 107 EXPORT_SYMBOL_GPL(iscsi_conn_queue_work); 108 109 static void __iscsi_update_cmdsn(struct iscsi_session *session, 110 uint32_t exp_cmdsn, uint32_t max_cmdsn) 111 { 112 /* 113 * standard specifies this check for when to update expected and 114 * max sequence numbers 115 */ 116 if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1)) 117 return; 118 119 if (exp_cmdsn != session->exp_cmdsn && 120 !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn)) 121 session->exp_cmdsn = exp_cmdsn; 122 123 if (max_cmdsn != session->max_cmdsn && 124 !iscsi_sna_lt(max_cmdsn, session->max_cmdsn)) 125 session->max_cmdsn = max_cmdsn; 126 } 127 128 void iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr) 129 { 130 __iscsi_update_cmdsn(session, be32_to_cpu(hdr->exp_cmdsn), 131 be32_to_cpu(hdr->max_cmdsn)); 132 } 133 EXPORT_SYMBOL_GPL(iscsi_update_cmdsn); 134 135 /** 136 * iscsi_prep_data_out_pdu - initialize Data-Out 137 * @task: scsi command task 138 * @r2t: R2T info 139 * @hdr: iscsi data in pdu 140 * 141 * Notes: 142 * Initialize Data-Out within this R2T sequence and finds 143 * proper data_offset within this SCSI command. 144 * 145 * This function is called with connection lock taken. 146 **/ 147 void iscsi_prep_data_out_pdu(struct iscsi_task *task, struct iscsi_r2t_info *r2t, 148 struct iscsi_data *hdr) 149 { 150 struct iscsi_conn *conn = task->conn; 151 unsigned int left = r2t->data_length - r2t->sent; 152 153 task->hdr_len = sizeof(struct iscsi_data); 154 155 memset(hdr, 0, sizeof(struct iscsi_data)); 156 hdr->ttt = r2t->ttt; 157 hdr->datasn = cpu_to_be32(r2t->datasn); 158 r2t->datasn++; 159 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; 160 hdr->lun = task->lun; 161 hdr->itt = task->hdr_itt; 162 hdr->exp_statsn = r2t->exp_statsn; 163 hdr->offset = cpu_to_be32(r2t->data_offset + r2t->sent); 164 if (left > conn->max_xmit_dlength) { 165 hton24(hdr->dlength, conn->max_xmit_dlength); 166 r2t->data_count = conn->max_xmit_dlength; 167 hdr->flags = 0; 168 } else { 169 hton24(hdr->dlength, left); 170 r2t->data_count = left; 171 hdr->flags = ISCSI_FLAG_CMD_FINAL; 172 } 173 conn->dataout_pdus_cnt++; 174 } 175 EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu); 176 177 static int iscsi_add_hdr(struct iscsi_task *task, unsigned len) 178 { 179 unsigned exp_len = task->hdr_len + len; 180 181 if (exp_len > task->hdr_max) { 182 WARN_ON(1); 183 return -EINVAL; 184 } 185 186 WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */ 187 task->hdr_len = exp_len; 188 return 0; 189 } 190 191 /* 192 * make an extended cdb AHS 193 */ 194 static int iscsi_prep_ecdb_ahs(struct iscsi_task *task) 195 { 196 struct scsi_cmnd *cmd = task->sc; 197 unsigned rlen, pad_len; 198 unsigned short ahslength; 199 struct iscsi_ecdb_ahdr *ecdb_ahdr; 200 int rc; 201 202 ecdb_ahdr = iscsi_next_hdr(task); 203 rlen = cmd->cmd_len - ISCSI_CDB_SIZE; 204 205 BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb)); 206 ahslength = rlen + sizeof(ecdb_ahdr->reserved); 207 208 pad_len = iscsi_padding(rlen); 209 210 rc = iscsi_add_hdr(task, sizeof(ecdb_ahdr->ahslength) + 211 sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len); 212 if (rc) 213 return rc; 214 215 if (pad_len) 216 memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len); 217 218 ecdb_ahdr->ahslength = cpu_to_be16(ahslength); 219 ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB; 220 ecdb_ahdr->reserved = 0; 221 memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen); 222 223 ISCSI_DBG_SESSION(task->conn->session, 224 "iscsi_prep_ecdb_ahs: varlen_cdb_len %d " 225 "rlen %d pad_len %d ahs_length %d iscsi_headers_size " 226 "%u\n", cmd->cmd_len, rlen, pad_len, ahslength, 227 task->hdr_len); 228 return 0; 229 } 230 231 static int iscsi_prep_bidi_ahs(struct iscsi_task *task) 232 { 233 struct scsi_cmnd *sc = task->sc; 234 struct iscsi_rlength_ahdr *rlen_ahdr; 235 int rc; 236 237 rlen_ahdr = iscsi_next_hdr(task); 238 rc = iscsi_add_hdr(task, sizeof(*rlen_ahdr)); 239 if (rc) 240 return rc; 241 242 rlen_ahdr->ahslength = 243 cpu_to_be16(sizeof(rlen_ahdr->read_length) + 244 sizeof(rlen_ahdr->reserved)); 245 rlen_ahdr->ahstype = ISCSI_AHSTYPE_RLENGTH; 246 rlen_ahdr->reserved = 0; 247 rlen_ahdr->read_length = cpu_to_be32(scsi_in(sc)->length); 248 249 ISCSI_DBG_SESSION(task->conn->session, 250 "bidi-in rlen_ahdr->read_length(%d) " 251 "rlen_ahdr->ahslength(%d)\n", 252 be32_to_cpu(rlen_ahdr->read_length), 253 be16_to_cpu(rlen_ahdr->ahslength)); 254 return 0; 255 } 256 257 /** 258 * iscsi_check_tmf_restrictions - check if a task is affected by TMF 259 * @task: iscsi task 260 * @opcode: opcode to check for 261 * 262 * During TMF a task has to be checked if it's affected. 263 * All unrelated I/O can be passed through, but I/O to the 264 * affected LUN should be restricted. 265 * If 'fast_abort' is set we won't be sending any I/O to the 266 * affected LUN. 267 * Otherwise the target is waiting for all TTTs to be completed, 268 * so we have to send all outstanding Data-Out PDUs to the target. 269 */ 270 static int iscsi_check_tmf_restrictions(struct iscsi_task *task, int opcode) 271 { 272 struct iscsi_conn *conn = task->conn; 273 struct iscsi_tm *tmf = &conn->tmhdr; 274 u64 hdr_lun; 275 276 if (conn->tmf_state == TMF_INITIAL) 277 return 0; 278 279 if ((tmf->opcode & ISCSI_OPCODE_MASK) != ISCSI_OP_SCSI_TMFUNC) 280 return 0; 281 282 switch (ISCSI_TM_FUNC_VALUE(tmf)) { 283 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 284 /* 285 * Allow PDUs for unrelated LUNs 286 */ 287 hdr_lun = scsilun_to_int(&tmf->lun); 288 if (hdr_lun != task->sc->device->lun) 289 return 0; 290 /* fall through */ 291 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 292 /* 293 * Fail all SCSI cmd PDUs 294 */ 295 if (opcode != ISCSI_OP_SCSI_DATA_OUT) { 296 iscsi_conn_printk(KERN_INFO, conn, 297 "task [op %x itt " 298 "0x%x/0x%x] " 299 "rejected.\n", 300 opcode, task->itt, 301 task->hdr_itt); 302 return -EACCES; 303 } 304 /* 305 * And also all data-out PDUs in response to R2T 306 * if fast_abort is set. 307 */ 308 if (conn->session->fast_abort) { 309 iscsi_conn_printk(KERN_INFO, conn, 310 "task [op %x itt " 311 "0x%x/0x%x] fast abort.\n", 312 opcode, task->itt, 313 task->hdr_itt); 314 return -EACCES; 315 } 316 break; 317 case ISCSI_TM_FUNC_ABORT_TASK: 318 /* 319 * the caller has already checked if the task 320 * they want to abort was in the pending queue so if 321 * we are here the cmd pdu has gone out already, and 322 * we will only hit this for data-outs 323 */ 324 if (opcode == ISCSI_OP_SCSI_DATA_OUT && 325 task->hdr_itt == tmf->rtt) { 326 ISCSI_DBG_SESSION(conn->session, 327 "Preventing task %x/%x from sending " 328 "data-out due to abort task in " 329 "progress\n", task->itt, 330 task->hdr_itt); 331 return -EACCES; 332 } 333 break; 334 } 335 336 return 0; 337 } 338 339 /** 340 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu 341 * @task: iscsi task 342 * 343 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set 344 * fields like dlength or final based on how much data it sends 345 */ 346 static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task) 347 { 348 struct iscsi_conn *conn = task->conn; 349 struct iscsi_session *session = conn->session; 350 struct scsi_cmnd *sc = task->sc; 351 struct iscsi_scsi_req *hdr; 352 unsigned hdrlength, cmd_len, transfer_length; 353 itt_t itt; 354 int rc; 355 356 rc = iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_CMD); 357 if (rc) 358 return rc; 359 360 if (conn->session->tt->alloc_pdu) { 361 rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_CMD); 362 if (rc) 363 return rc; 364 } 365 hdr = (struct iscsi_scsi_req *)task->hdr; 366 itt = hdr->itt; 367 memset(hdr, 0, sizeof(*hdr)); 368 369 if (session->tt->parse_pdu_itt) 370 hdr->itt = task->hdr_itt = itt; 371 else 372 hdr->itt = task->hdr_itt = build_itt(task->itt, 373 task->conn->session->age); 374 task->hdr_len = 0; 375 rc = iscsi_add_hdr(task, sizeof(*hdr)); 376 if (rc) 377 return rc; 378 hdr->opcode = ISCSI_OP_SCSI_CMD; 379 hdr->flags = ISCSI_ATTR_SIMPLE; 380 int_to_scsilun(sc->device->lun, &hdr->lun); 381 task->lun = hdr->lun; 382 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); 383 cmd_len = sc->cmd_len; 384 if (cmd_len < ISCSI_CDB_SIZE) 385 memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len); 386 else if (cmd_len > ISCSI_CDB_SIZE) { 387 rc = iscsi_prep_ecdb_ahs(task); 388 if (rc) 389 return rc; 390 cmd_len = ISCSI_CDB_SIZE; 391 } 392 memcpy(hdr->cdb, sc->cmnd, cmd_len); 393 394 task->imm_count = 0; 395 if (scsi_bidi_cmnd(sc)) { 396 hdr->flags |= ISCSI_FLAG_CMD_READ; 397 rc = iscsi_prep_bidi_ahs(task); 398 if (rc) 399 return rc; 400 } 401 402 if (scsi_get_prot_op(sc) != SCSI_PROT_NORMAL) 403 task->protected = true; 404 405 transfer_length = scsi_transfer_length(sc); 406 hdr->data_length = cpu_to_be32(transfer_length); 407 if (sc->sc_data_direction == DMA_TO_DEVICE) { 408 struct iscsi_r2t_info *r2t = &task->unsol_r2t; 409 410 hdr->flags |= ISCSI_FLAG_CMD_WRITE; 411 /* 412 * Write counters: 413 * 414 * imm_count bytes to be sent right after 415 * SCSI PDU Header 416 * 417 * unsol_count bytes(as Data-Out) to be sent 418 * without R2T ack right after 419 * immediate data 420 * 421 * r2t data_length bytes to be sent via R2T ack's 422 * 423 * pad_count bytes to be sent as zero-padding 424 */ 425 memset(r2t, 0, sizeof(*r2t)); 426 427 if (session->imm_data_en) { 428 if (transfer_length >= session->first_burst) 429 task->imm_count = min(session->first_burst, 430 conn->max_xmit_dlength); 431 else 432 task->imm_count = min(transfer_length, 433 conn->max_xmit_dlength); 434 hton24(hdr->dlength, task->imm_count); 435 } else 436 zero_data(hdr->dlength); 437 438 if (!session->initial_r2t_en) { 439 r2t->data_length = min(session->first_burst, 440 transfer_length) - 441 task->imm_count; 442 r2t->data_offset = task->imm_count; 443 r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG); 444 r2t->exp_statsn = cpu_to_be32(conn->exp_statsn); 445 } 446 447 if (!task->unsol_r2t.data_length) 448 /* No unsolicit Data-Out's */ 449 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 450 } else { 451 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 452 zero_data(hdr->dlength); 453 454 if (sc->sc_data_direction == DMA_FROM_DEVICE) 455 hdr->flags |= ISCSI_FLAG_CMD_READ; 456 } 457 458 /* calculate size of additional header segments (AHSs) */ 459 hdrlength = task->hdr_len - sizeof(*hdr); 460 461 WARN_ON(hdrlength & (ISCSI_PAD_LEN-1)); 462 hdrlength /= ISCSI_PAD_LEN; 463 464 WARN_ON(hdrlength >= 256); 465 hdr->hlength = hdrlength & 0xFF; 466 hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn); 467 468 if (session->tt->init_task && session->tt->init_task(task)) 469 return -EIO; 470 471 task->state = ISCSI_TASK_RUNNING; 472 session->cmdsn++; 473 474 conn->scsicmd_pdus_cnt++; 475 ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x " 476 "itt 0x%x len %d bidi_len %d cmdsn %d win %d]\n", 477 scsi_bidi_cmnd(sc) ? "bidirectional" : 478 sc->sc_data_direction == DMA_TO_DEVICE ? 479 "write" : "read", conn->id, sc, sc->cmnd[0], 480 task->itt, transfer_length, 481 scsi_bidi_cmnd(sc) ? scsi_in(sc)->length : 0, 482 session->cmdsn, 483 session->max_cmdsn - session->exp_cmdsn + 1); 484 return 0; 485 } 486 487 /** 488 * iscsi_free_task - free a task 489 * @task: iscsi cmd task 490 * 491 * Must be called with session back_lock. 492 * This function returns the scsi command to scsi-ml or cleans 493 * up mgmt tasks then returns the task to the pool. 494 */ 495 static void iscsi_free_task(struct iscsi_task *task) 496 { 497 struct iscsi_conn *conn = task->conn; 498 struct iscsi_session *session = conn->session; 499 struct scsi_cmnd *sc = task->sc; 500 int oldstate = task->state; 501 502 ISCSI_DBG_SESSION(session, "freeing task itt 0x%x state %d sc %p\n", 503 task->itt, task->state, task->sc); 504 505 session->tt->cleanup_task(task); 506 task->state = ISCSI_TASK_FREE; 507 task->sc = NULL; 508 /* 509 * login task is preallocated so do not free 510 */ 511 if (conn->login_task == task) 512 return; 513 514 kfifo_in(&session->cmdpool.queue, (void*)&task, sizeof(void*)); 515 516 if (sc) { 517 /* SCSI eh reuses commands to verify us */ 518 sc->SCp.ptr = NULL; 519 /* 520 * queue command may call this to free the task, so 521 * it will decide how to return sc to scsi-ml. 522 */ 523 if (oldstate != ISCSI_TASK_REQUEUE_SCSIQ) 524 sc->scsi_done(sc); 525 } 526 } 527 528 void __iscsi_get_task(struct iscsi_task *task) 529 { 530 refcount_inc(&task->refcount); 531 } 532 EXPORT_SYMBOL_GPL(__iscsi_get_task); 533 534 void __iscsi_put_task(struct iscsi_task *task) 535 { 536 if (refcount_dec_and_test(&task->refcount)) 537 iscsi_free_task(task); 538 } 539 EXPORT_SYMBOL_GPL(__iscsi_put_task); 540 541 void iscsi_put_task(struct iscsi_task *task) 542 { 543 struct iscsi_session *session = task->conn->session; 544 545 /* regular RX path uses back_lock */ 546 spin_lock_bh(&session->back_lock); 547 __iscsi_put_task(task); 548 spin_unlock_bh(&session->back_lock); 549 } 550 EXPORT_SYMBOL_GPL(iscsi_put_task); 551 552 /** 553 * iscsi_complete_task - finish a task 554 * @task: iscsi cmd task 555 * @state: state to complete task with 556 * 557 * Must be called with session back_lock. 558 */ 559 static void iscsi_complete_task(struct iscsi_task *task, int state) 560 { 561 struct iscsi_conn *conn = task->conn; 562 563 ISCSI_DBG_SESSION(conn->session, 564 "complete task itt 0x%x state %d sc %p\n", 565 task->itt, task->state, task->sc); 566 if (task->state == ISCSI_TASK_COMPLETED || 567 task->state == ISCSI_TASK_ABRT_TMF || 568 task->state == ISCSI_TASK_ABRT_SESS_RECOV || 569 task->state == ISCSI_TASK_REQUEUE_SCSIQ) 570 return; 571 WARN_ON_ONCE(task->state == ISCSI_TASK_FREE); 572 task->state = state; 573 574 spin_lock_bh(&conn->taskqueuelock); 575 if (!list_empty(&task->running)) { 576 pr_debug_once("%s while task on list", __func__); 577 list_del_init(&task->running); 578 } 579 spin_unlock_bh(&conn->taskqueuelock); 580 581 if (conn->task == task) 582 conn->task = NULL; 583 584 if (conn->ping_task == task) 585 conn->ping_task = NULL; 586 587 /* release get from queueing */ 588 __iscsi_put_task(task); 589 } 590 591 /** 592 * iscsi_complete_scsi_task - finish scsi task normally 593 * @task: iscsi task for scsi cmd 594 * @exp_cmdsn: expected cmd sn in cpu format 595 * @max_cmdsn: max cmd sn in cpu format 596 * 597 * This is used when drivers do not need or cannot perform 598 * lower level pdu processing. 599 * 600 * Called with session back_lock 601 */ 602 void iscsi_complete_scsi_task(struct iscsi_task *task, 603 uint32_t exp_cmdsn, uint32_t max_cmdsn) 604 { 605 struct iscsi_conn *conn = task->conn; 606 607 ISCSI_DBG_SESSION(conn->session, "[itt 0x%x]\n", task->itt); 608 609 conn->last_recv = jiffies; 610 __iscsi_update_cmdsn(conn->session, exp_cmdsn, max_cmdsn); 611 iscsi_complete_task(task, ISCSI_TASK_COMPLETED); 612 } 613 EXPORT_SYMBOL_GPL(iscsi_complete_scsi_task); 614 615 616 /* 617 * session back_lock must be held and if not called for a task that is 618 * still pending or from the xmit thread, then xmit thread must 619 * be suspended. 620 */ 621 static void fail_scsi_task(struct iscsi_task *task, int err) 622 { 623 struct iscsi_conn *conn = task->conn; 624 struct scsi_cmnd *sc; 625 int state; 626 627 /* 628 * if a command completes and we get a successful tmf response 629 * we will hit this because the scsi eh abort code does not take 630 * a ref to the task. 631 */ 632 sc = task->sc; 633 if (!sc) 634 return; 635 636 if (task->state == ISCSI_TASK_PENDING) { 637 /* 638 * cmd never made it to the xmit thread, so we should not count 639 * the cmd in the sequencing 640 */ 641 conn->session->queued_cmdsn--; 642 /* it was never sent so just complete like normal */ 643 state = ISCSI_TASK_COMPLETED; 644 } else if (err == DID_TRANSPORT_DISRUPTED) 645 state = ISCSI_TASK_ABRT_SESS_RECOV; 646 else 647 state = ISCSI_TASK_ABRT_TMF; 648 649 sc->result = err << 16; 650 if (!scsi_bidi_cmnd(sc)) 651 scsi_set_resid(sc, scsi_bufflen(sc)); 652 else { 653 scsi_out(sc)->resid = scsi_out(sc)->length; 654 scsi_in(sc)->resid = scsi_in(sc)->length; 655 } 656 657 /* regular RX path uses back_lock */ 658 spin_lock_bh(&conn->session->back_lock); 659 iscsi_complete_task(task, state); 660 spin_unlock_bh(&conn->session->back_lock); 661 } 662 663 static int iscsi_prep_mgmt_task(struct iscsi_conn *conn, 664 struct iscsi_task *task) 665 { 666 struct iscsi_session *session = conn->session; 667 struct iscsi_hdr *hdr = task->hdr; 668 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr; 669 uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK; 670 671 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) 672 return -ENOTCONN; 673 674 if (opcode != ISCSI_OP_LOGIN && opcode != ISCSI_OP_TEXT) 675 nop->exp_statsn = cpu_to_be32(conn->exp_statsn); 676 /* 677 * pre-format CmdSN for outgoing PDU. 678 */ 679 nop->cmdsn = cpu_to_be32(session->cmdsn); 680 if (hdr->itt != RESERVED_ITT) { 681 /* 682 * TODO: We always use immediate for normal session pdus. 683 * If we start to send tmfs or nops as non-immediate then 684 * we should start checking the cmdsn numbers for mgmt tasks. 685 * 686 * During discovery sessions iscsid sends TEXT as non immediate, 687 * but we always only send one PDU at a time. 688 */ 689 if (conn->c_stage == ISCSI_CONN_STARTED && 690 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 691 session->queued_cmdsn++; 692 session->cmdsn++; 693 } 694 } 695 696 if (session->tt->init_task && session->tt->init_task(task)) 697 return -EIO; 698 699 if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT) 700 session->state = ISCSI_STATE_LOGGING_OUT; 701 702 task->state = ISCSI_TASK_RUNNING; 703 ISCSI_DBG_SESSION(session, "mgmtpdu [op 0x%x hdr->itt 0x%x " 704 "datalen %d]\n", hdr->opcode & ISCSI_OPCODE_MASK, 705 hdr->itt, task->data_count); 706 return 0; 707 } 708 709 static struct iscsi_task * 710 __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 711 char *data, uint32_t data_size) 712 { 713 struct iscsi_session *session = conn->session; 714 struct iscsi_host *ihost = shost_priv(session->host); 715 uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK; 716 struct iscsi_task *task; 717 itt_t itt; 718 719 if (session->state == ISCSI_STATE_TERMINATE) 720 return NULL; 721 722 if (opcode == ISCSI_OP_LOGIN || opcode == ISCSI_OP_TEXT) { 723 /* 724 * Login and Text are sent serially, in 725 * request-followed-by-response sequence. 726 * Same task can be used. Same ITT must be used. 727 * Note that login_task is preallocated at conn_create(). 728 */ 729 if (conn->login_task->state != ISCSI_TASK_FREE) { 730 iscsi_conn_printk(KERN_ERR, conn, "Login/Text in " 731 "progress. Cannot start new task.\n"); 732 return NULL; 733 } 734 735 if (data_size > ISCSI_DEF_MAX_RECV_SEG_LEN) { 736 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); 737 return NULL; 738 } 739 740 task = conn->login_task; 741 } else { 742 if (session->state != ISCSI_STATE_LOGGED_IN) 743 return NULL; 744 745 if (data_size != 0) { 746 iscsi_conn_printk(KERN_ERR, conn, "Can not send data buffer of len %u for op 0x%x\n", data_size, opcode); 747 return NULL; 748 } 749 750 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE); 751 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED); 752 753 if (!kfifo_out(&session->cmdpool.queue, 754 (void*)&task, sizeof(void*))) 755 return NULL; 756 } 757 /* 758 * released in complete pdu for task we expect a response for, and 759 * released by the lld when it has transmitted the task for 760 * pdus we do not expect a response for. 761 */ 762 refcount_set(&task->refcount, 1); 763 task->conn = conn; 764 task->sc = NULL; 765 INIT_LIST_HEAD(&task->running); 766 task->state = ISCSI_TASK_PENDING; 767 768 if (data_size) { 769 memcpy(task->data, data, data_size); 770 task->data_count = data_size; 771 } else 772 task->data_count = 0; 773 774 if (conn->session->tt->alloc_pdu) { 775 if (conn->session->tt->alloc_pdu(task, hdr->opcode)) { 776 iscsi_conn_printk(KERN_ERR, conn, "Could not allocate " 777 "pdu for mgmt task.\n"); 778 goto free_task; 779 } 780 } 781 782 itt = task->hdr->itt; 783 task->hdr_len = sizeof(struct iscsi_hdr); 784 memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr)); 785 786 if (hdr->itt != RESERVED_ITT) { 787 if (session->tt->parse_pdu_itt) 788 task->hdr->itt = itt; 789 else 790 task->hdr->itt = build_itt(task->itt, 791 task->conn->session->age); 792 } 793 794 if (!ihost->workq) { 795 if (iscsi_prep_mgmt_task(conn, task)) 796 goto free_task; 797 798 if (session->tt->xmit_task(task)) 799 goto free_task; 800 } else { 801 spin_lock_bh(&conn->taskqueuelock); 802 list_add_tail(&task->running, &conn->mgmtqueue); 803 spin_unlock_bh(&conn->taskqueuelock); 804 iscsi_conn_queue_work(conn); 805 } 806 807 return task; 808 809 free_task: 810 /* regular RX path uses back_lock */ 811 spin_lock(&session->back_lock); 812 __iscsi_put_task(task); 813 spin_unlock(&session->back_lock); 814 return NULL; 815 } 816 817 int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr, 818 char *data, uint32_t data_size) 819 { 820 struct iscsi_conn *conn = cls_conn->dd_data; 821 struct iscsi_session *session = conn->session; 822 int err = 0; 823 824 spin_lock_bh(&session->frwd_lock); 825 if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size)) 826 err = -EPERM; 827 spin_unlock_bh(&session->frwd_lock); 828 return err; 829 } 830 EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu); 831 832 /** 833 * iscsi_cmd_rsp - SCSI Command Response processing 834 * @conn: iscsi connection 835 * @hdr: iscsi header 836 * @task: scsi command task 837 * @data: cmd data buffer 838 * @datalen: len of buffer 839 * 840 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and 841 * then completes the command and task. 842 **/ 843 static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 844 struct iscsi_task *task, char *data, 845 int datalen) 846 { 847 struct iscsi_scsi_rsp *rhdr = (struct iscsi_scsi_rsp *)hdr; 848 struct iscsi_session *session = conn->session; 849 struct scsi_cmnd *sc = task->sc; 850 851 iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); 852 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; 853 854 sc->result = (DID_OK << 16) | rhdr->cmd_status; 855 856 if (task->protected) { 857 sector_t sector; 858 u8 ascq; 859 860 /** 861 * Transports that didn't implement check_protection 862 * callback but still published T10-PI support to scsi-mid 863 * deserve this BUG_ON. 864 **/ 865 BUG_ON(!session->tt->check_protection); 866 867 ascq = session->tt->check_protection(task, §or); 868 if (ascq) { 869 sc->result = DRIVER_SENSE << 24 | 870 SAM_STAT_CHECK_CONDITION; 871 scsi_build_sense_buffer(1, sc->sense_buffer, 872 ILLEGAL_REQUEST, 0x10, ascq); 873 scsi_set_sense_information(sc->sense_buffer, 874 SCSI_SENSE_BUFFERSIZE, 875 sector); 876 goto out; 877 } 878 } 879 880 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) { 881 sc->result = DID_ERROR << 16; 882 goto out; 883 } 884 885 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) { 886 uint16_t senselen; 887 888 if (datalen < 2) { 889 invalid_datalen: 890 iscsi_conn_printk(KERN_ERR, conn, 891 "Got CHECK_CONDITION but invalid data " 892 "buffer size of %d\n", datalen); 893 sc->result = DID_BAD_TARGET << 16; 894 goto out; 895 } 896 897 senselen = get_unaligned_be16(data); 898 if (datalen < senselen) 899 goto invalid_datalen; 900 901 memcpy(sc->sense_buffer, data + 2, 902 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); 903 ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n", 904 min_t(uint16_t, senselen, 905 SCSI_SENSE_BUFFERSIZE)); 906 } 907 908 if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW | 909 ISCSI_FLAG_CMD_BIDI_OVERFLOW)) { 910 int res_count = be32_to_cpu(rhdr->bi_residual_count); 911 912 if (scsi_bidi_cmnd(sc) && res_count > 0 && 913 (rhdr->flags & ISCSI_FLAG_CMD_BIDI_OVERFLOW || 914 res_count <= scsi_in(sc)->length)) 915 scsi_in(sc)->resid = res_count; 916 else 917 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; 918 } 919 920 if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW | 921 ISCSI_FLAG_CMD_OVERFLOW)) { 922 int res_count = be32_to_cpu(rhdr->residual_count); 923 924 if (res_count > 0 && 925 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || 926 res_count <= scsi_bufflen(sc))) 927 /* write side for bidi or uni-io set_resid */ 928 scsi_set_resid(sc, res_count); 929 else 930 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; 931 } 932 out: 933 ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n", 934 sc, sc->result, task->itt); 935 conn->scsirsp_pdus_cnt++; 936 iscsi_complete_task(task, ISCSI_TASK_COMPLETED); 937 } 938 939 /** 940 * iscsi_data_in_rsp - SCSI Data-In Response processing 941 * @conn: iscsi connection 942 * @hdr: iscsi pdu 943 * @task: scsi command task 944 **/ 945 static void 946 iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 947 struct iscsi_task *task) 948 { 949 struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr; 950 struct scsi_cmnd *sc = task->sc; 951 952 if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS)) 953 return; 954 955 iscsi_update_cmdsn(conn->session, (struct iscsi_nopin *)hdr); 956 sc->result = (DID_OK << 16) | rhdr->cmd_status; 957 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; 958 if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW | 959 ISCSI_FLAG_DATA_OVERFLOW)) { 960 int res_count = be32_to_cpu(rhdr->residual_count); 961 962 if (res_count > 0 && 963 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || 964 res_count <= scsi_in(sc)->length)) 965 scsi_in(sc)->resid = res_count; 966 else 967 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; 968 } 969 970 ISCSI_DBG_SESSION(conn->session, "data in with status done " 971 "[sc %p res %d itt 0x%x]\n", 972 sc, sc->result, task->itt); 973 conn->scsirsp_pdus_cnt++; 974 iscsi_complete_task(task, ISCSI_TASK_COMPLETED); 975 } 976 977 static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr) 978 { 979 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr; 980 981 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; 982 conn->tmfrsp_pdus_cnt++; 983 984 if (conn->tmf_state != TMF_QUEUED) 985 return; 986 987 if (tmf->response == ISCSI_TMF_RSP_COMPLETE) 988 conn->tmf_state = TMF_SUCCESS; 989 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK) 990 conn->tmf_state = TMF_NOT_FOUND; 991 else 992 conn->tmf_state = TMF_FAILED; 993 wake_up(&conn->ehwait); 994 } 995 996 static int iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr) 997 { 998 struct iscsi_nopout hdr; 999 struct iscsi_task *task; 1000 1001 if (!rhdr && conn->ping_task) 1002 return -EINVAL; 1003 1004 memset(&hdr, 0, sizeof(struct iscsi_nopout)); 1005 hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE; 1006 hdr.flags = ISCSI_FLAG_CMD_FINAL; 1007 1008 if (rhdr) { 1009 hdr.lun = rhdr->lun; 1010 hdr.ttt = rhdr->ttt; 1011 hdr.itt = RESERVED_ITT; 1012 } else 1013 hdr.ttt = RESERVED_ITT; 1014 1015 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0); 1016 if (!task) { 1017 iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n"); 1018 return -EIO; 1019 } else if (!rhdr) { 1020 /* only track our nops */ 1021 conn->ping_task = task; 1022 conn->last_ping = jiffies; 1023 } 1024 1025 return 0; 1026 } 1027 1028 static int iscsi_nop_out_rsp(struct iscsi_task *task, 1029 struct iscsi_nopin *nop, char *data, int datalen) 1030 { 1031 struct iscsi_conn *conn = task->conn; 1032 int rc = 0; 1033 1034 if (conn->ping_task != task) { 1035 /* 1036 * If this is not in response to one of our 1037 * nops then it must be from userspace. 1038 */ 1039 if (iscsi_recv_pdu(conn->cls_conn, (struct iscsi_hdr *)nop, 1040 data, datalen)) 1041 rc = ISCSI_ERR_CONN_FAILED; 1042 } else 1043 mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout); 1044 iscsi_complete_task(task, ISCSI_TASK_COMPLETED); 1045 return rc; 1046 } 1047 1048 static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 1049 char *data, int datalen) 1050 { 1051 struct iscsi_reject *reject = (struct iscsi_reject *)hdr; 1052 struct iscsi_hdr rejected_pdu; 1053 int opcode, rc = 0; 1054 1055 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1; 1056 1057 if (ntoh24(reject->dlength) > datalen || 1058 ntoh24(reject->dlength) < sizeof(struct iscsi_hdr)) { 1059 iscsi_conn_printk(KERN_ERR, conn, "Cannot handle rejected " 1060 "pdu. Invalid data length (pdu dlength " 1061 "%u, datalen %d\n", ntoh24(reject->dlength), 1062 datalen); 1063 return ISCSI_ERR_PROTO; 1064 } 1065 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr)); 1066 opcode = rejected_pdu.opcode & ISCSI_OPCODE_MASK; 1067 1068 switch (reject->reason) { 1069 case ISCSI_REASON_DATA_DIGEST_ERROR: 1070 iscsi_conn_printk(KERN_ERR, conn, 1071 "pdu (op 0x%x itt 0x%x) rejected " 1072 "due to DataDigest error.\n", 1073 opcode, rejected_pdu.itt); 1074 break; 1075 case ISCSI_REASON_IMM_CMD_REJECT: 1076 iscsi_conn_printk(KERN_ERR, conn, 1077 "pdu (op 0x%x itt 0x%x) rejected. Too many " 1078 "immediate commands.\n", 1079 opcode, rejected_pdu.itt); 1080 /* 1081 * We only send one TMF at a time so if the target could not 1082 * handle it, then it should get fixed (RFC mandates that 1083 * a target can handle one immediate TMF per conn). 1084 * 1085 * For nops-outs, we could have sent more than one if 1086 * the target is sending us lots of nop-ins 1087 */ 1088 if (opcode != ISCSI_OP_NOOP_OUT) 1089 return 0; 1090 1091 if (rejected_pdu.itt == cpu_to_be32(ISCSI_RESERVED_TAG)) { 1092 /* 1093 * nop-out in response to target's nop-out rejected. 1094 * Just resend. 1095 */ 1096 /* In RX path we are under back lock */ 1097 spin_unlock(&conn->session->back_lock); 1098 spin_lock(&conn->session->frwd_lock); 1099 iscsi_send_nopout(conn, 1100 (struct iscsi_nopin*)&rejected_pdu); 1101 spin_unlock(&conn->session->frwd_lock); 1102 spin_lock(&conn->session->back_lock); 1103 } else { 1104 struct iscsi_task *task; 1105 /* 1106 * Our nop as ping got dropped. We know the target 1107 * and transport are ok so just clean up 1108 */ 1109 task = iscsi_itt_to_task(conn, rejected_pdu.itt); 1110 if (!task) { 1111 iscsi_conn_printk(KERN_ERR, conn, 1112 "Invalid pdu reject. Could " 1113 "not lookup rejected task.\n"); 1114 rc = ISCSI_ERR_BAD_ITT; 1115 } else 1116 rc = iscsi_nop_out_rsp(task, 1117 (struct iscsi_nopin*)&rejected_pdu, 1118 NULL, 0); 1119 } 1120 break; 1121 default: 1122 iscsi_conn_printk(KERN_ERR, conn, 1123 "pdu (op 0x%x itt 0x%x) rejected. Reason " 1124 "code 0x%x\n", rejected_pdu.opcode, 1125 rejected_pdu.itt, reject->reason); 1126 break; 1127 } 1128 return rc; 1129 } 1130 1131 /** 1132 * iscsi_itt_to_task - look up task by itt 1133 * @conn: iscsi connection 1134 * @itt: itt 1135 * 1136 * This should be used for mgmt tasks like login and nops, or if 1137 * the LDD's itt space does not include the session age. 1138 * 1139 * The session back_lock must be held. 1140 */ 1141 struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt) 1142 { 1143 struct iscsi_session *session = conn->session; 1144 int i; 1145 1146 if (itt == RESERVED_ITT) 1147 return NULL; 1148 1149 if (session->tt->parse_pdu_itt) 1150 session->tt->parse_pdu_itt(conn, itt, &i, NULL); 1151 else 1152 i = get_itt(itt); 1153 if (i >= session->cmds_max) 1154 return NULL; 1155 1156 return session->cmds[i]; 1157 } 1158 EXPORT_SYMBOL_GPL(iscsi_itt_to_task); 1159 1160 /** 1161 * __iscsi_complete_pdu - complete pdu 1162 * @conn: iscsi conn 1163 * @hdr: iscsi header 1164 * @data: data buffer 1165 * @datalen: len of data buffer 1166 * 1167 * Completes pdu processing by freeing any resources allocated at 1168 * queuecommand or send generic. session back_lock must be held and verify 1169 * itt must have been called. 1170 */ 1171 int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 1172 char *data, int datalen) 1173 { 1174 struct iscsi_session *session = conn->session; 1175 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0; 1176 struct iscsi_task *task; 1177 uint32_t itt; 1178 1179 conn->last_recv = jiffies; 1180 rc = iscsi_verify_itt(conn, hdr->itt); 1181 if (rc) 1182 return rc; 1183 1184 if (hdr->itt != RESERVED_ITT) 1185 itt = get_itt(hdr->itt); 1186 else 1187 itt = ~0U; 1188 1189 ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n", 1190 opcode, conn->id, itt, datalen); 1191 1192 if (itt == ~0U) { 1193 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); 1194 1195 switch(opcode) { 1196 case ISCSI_OP_NOOP_IN: 1197 if (datalen) { 1198 rc = ISCSI_ERR_PROTO; 1199 break; 1200 } 1201 1202 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG)) 1203 break; 1204 1205 /* In RX path we are under back lock */ 1206 spin_unlock(&session->back_lock); 1207 spin_lock(&session->frwd_lock); 1208 iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr); 1209 spin_unlock(&session->frwd_lock); 1210 spin_lock(&session->back_lock); 1211 break; 1212 case ISCSI_OP_REJECT: 1213 rc = iscsi_handle_reject(conn, hdr, data, datalen); 1214 break; 1215 case ISCSI_OP_ASYNC_EVENT: 1216 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; 1217 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) 1218 rc = ISCSI_ERR_CONN_FAILED; 1219 break; 1220 default: 1221 rc = ISCSI_ERR_BAD_OPCODE; 1222 break; 1223 } 1224 goto out; 1225 } 1226 1227 switch(opcode) { 1228 case ISCSI_OP_SCSI_CMD_RSP: 1229 case ISCSI_OP_SCSI_DATA_IN: 1230 task = iscsi_itt_to_ctask(conn, hdr->itt); 1231 if (!task) 1232 return ISCSI_ERR_BAD_ITT; 1233 task->last_xfer = jiffies; 1234 break; 1235 case ISCSI_OP_R2T: 1236 /* 1237 * LLD handles R2Ts if they need to. 1238 */ 1239 return 0; 1240 case ISCSI_OP_LOGOUT_RSP: 1241 case ISCSI_OP_LOGIN_RSP: 1242 case ISCSI_OP_TEXT_RSP: 1243 case ISCSI_OP_SCSI_TMFUNC_RSP: 1244 case ISCSI_OP_NOOP_IN: 1245 task = iscsi_itt_to_task(conn, hdr->itt); 1246 if (!task) 1247 return ISCSI_ERR_BAD_ITT; 1248 break; 1249 default: 1250 return ISCSI_ERR_BAD_OPCODE; 1251 } 1252 1253 switch(opcode) { 1254 case ISCSI_OP_SCSI_CMD_RSP: 1255 iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen); 1256 break; 1257 case ISCSI_OP_SCSI_DATA_IN: 1258 iscsi_data_in_rsp(conn, hdr, task); 1259 break; 1260 case ISCSI_OP_LOGOUT_RSP: 1261 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); 1262 if (datalen) { 1263 rc = ISCSI_ERR_PROTO; 1264 break; 1265 } 1266 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; 1267 goto recv_pdu; 1268 case ISCSI_OP_LOGIN_RSP: 1269 case ISCSI_OP_TEXT_RSP: 1270 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); 1271 /* 1272 * login related PDU's exp_statsn is handled in 1273 * userspace 1274 */ 1275 goto recv_pdu; 1276 case ISCSI_OP_SCSI_TMFUNC_RSP: 1277 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); 1278 if (datalen) { 1279 rc = ISCSI_ERR_PROTO; 1280 break; 1281 } 1282 1283 iscsi_tmf_rsp(conn, hdr); 1284 iscsi_complete_task(task, ISCSI_TASK_COMPLETED); 1285 break; 1286 case ISCSI_OP_NOOP_IN: 1287 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); 1288 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) { 1289 rc = ISCSI_ERR_PROTO; 1290 break; 1291 } 1292 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; 1293 1294 rc = iscsi_nop_out_rsp(task, (struct iscsi_nopin*)hdr, 1295 data, datalen); 1296 break; 1297 default: 1298 rc = ISCSI_ERR_BAD_OPCODE; 1299 break; 1300 } 1301 1302 out: 1303 return rc; 1304 recv_pdu: 1305 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) 1306 rc = ISCSI_ERR_CONN_FAILED; 1307 iscsi_complete_task(task, ISCSI_TASK_COMPLETED); 1308 return rc; 1309 } 1310 EXPORT_SYMBOL_GPL(__iscsi_complete_pdu); 1311 1312 int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 1313 char *data, int datalen) 1314 { 1315 int rc; 1316 1317 spin_lock(&conn->session->back_lock); 1318 rc = __iscsi_complete_pdu(conn, hdr, data, datalen); 1319 spin_unlock(&conn->session->back_lock); 1320 return rc; 1321 } 1322 EXPORT_SYMBOL_GPL(iscsi_complete_pdu); 1323 1324 int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt) 1325 { 1326 struct iscsi_session *session = conn->session; 1327 int age = 0, i = 0; 1328 1329 if (itt == RESERVED_ITT) 1330 return 0; 1331 1332 if (session->tt->parse_pdu_itt) 1333 session->tt->parse_pdu_itt(conn, itt, &i, &age); 1334 else { 1335 i = get_itt(itt); 1336 age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK; 1337 } 1338 1339 if (age != session->age) { 1340 iscsi_conn_printk(KERN_ERR, conn, 1341 "received itt %x expected session age (%x)\n", 1342 (__force u32)itt, session->age); 1343 return ISCSI_ERR_BAD_ITT; 1344 } 1345 1346 if (i >= session->cmds_max) { 1347 iscsi_conn_printk(KERN_ERR, conn, 1348 "received invalid itt index %u (max cmds " 1349 "%u.\n", i, session->cmds_max); 1350 return ISCSI_ERR_BAD_ITT; 1351 } 1352 return 0; 1353 } 1354 EXPORT_SYMBOL_GPL(iscsi_verify_itt); 1355 1356 /** 1357 * iscsi_itt_to_ctask - look up ctask by itt 1358 * @conn: iscsi connection 1359 * @itt: itt 1360 * 1361 * This should be used for cmd tasks. 1362 * 1363 * The session back_lock must be held. 1364 */ 1365 struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt) 1366 { 1367 struct iscsi_task *task; 1368 1369 if (iscsi_verify_itt(conn, itt)) 1370 return NULL; 1371 1372 task = iscsi_itt_to_task(conn, itt); 1373 if (!task || !task->sc) 1374 return NULL; 1375 1376 if (task->sc->SCp.phase != conn->session->age) { 1377 iscsi_session_printk(KERN_ERR, conn->session, 1378 "task's session age %d, expected %d\n", 1379 task->sc->SCp.phase, conn->session->age); 1380 return NULL; 1381 } 1382 1383 return task; 1384 } 1385 EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask); 1386 1387 void iscsi_session_failure(struct iscsi_session *session, 1388 enum iscsi_err err) 1389 { 1390 struct iscsi_conn *conn; 1391 struct device *dev; 1392 1393 spin_lock_bh(&session->frwd_lock); 1394 conn = session->leadconn; 1395 if (session->state == ISCSI_STATE_TERMINATE || !conn) { 1396 spin_unlock_bh(&session->frwd_lock); 1397 return; 1398 } 1399 1400 dev = get_device(&conn->cls_conn->dev); 1401 spin_unlock_bh(&session->frwd_lock); 1402 if (!dev) 1403 return; 1404 /* 1405 * if the host is being removed bypass the connection 1406 * recovery initialization because we are going to kill 1407 * the session. 1408 */ 1409 if (err == ISCSI_ERR_INVALID_HOST) 1410 iscsi_conn_error_event(conn->cls_conn, err); 1411 else 1412 iscsi_conn_failure(conn, err); 1413 put_device(dev); 1414 } 1415 EXPORT_SYMBOL_GPL(iscsi_session_failure); 1416 1417 void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err) 1418 { 1419 struct iscsi_session *session = conn->session; 1420 1421 spin_lock_bh(&session->frwd_lock); 1422 if (session->state == ISCSI_STATE_FAILED) { 1423 spin_unlock_bh(&session->frwd_lock); 1424 return; 1425 } 1426 1427 if (conn->stop_stage == 0) 1428 session->state = ISCSI_STATE_FAILED; 1429 spin_unlock_bh(&session->frwd_lock); 1430 1431 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); 1432 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); 1433 iscsi_conn_error_event(conn->cls_conn, err); 1434 } 1435 EXPORT_SYMBOL_GPL(iscsi_conn_failure); 1436 1437 static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn) 1438 { 1439 struct iscsi_session *session = conn->session; 1440 1441 /* 1442 * Check for iSCSI window and take care of CmdSN wrap-around 1443 */ 1444 if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) { 1445 ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn " 1446 "%u MaxCmdSN %u CmdSN %u/%u\n", 1447 session->exp_cmdsn, session->max_cmdsn, 1448 session->cmdsn, session->queued_cmdsn); 1449 return -ENOSPC; 1450 } 1451 return 0; 1452 } 1453 1454 static int iscsi_xmit_task(struct iscsi_conn *conn) 1455 { 1456 struct iscsi_task *task = conn->task; 1457 int rc; 1458 1459 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) 1460 return -ENODATA; 1461 1462 __iscsi_get_task(task); 1463 spin_unlock_bh(&conn->session->frwd_lock); 1464 rc = conn->session->tt->xmit_task(task); 1465 spin_lock_bh(&conn->session->frwd_lock); 1466 if (!rc) { 1467 /* done with this task */ 1468 task->last_xfer = jiffies; 1469 conn->task = NULL; 1470 } 1471 /* regular RX path uses back_lock */ 1472 spin_lock(&conn->session->back_lock); 1473 __iscsi_put_task(task); 1474 spin_unlock(&conn->session->back_lock); 1475 return rc; 1476 } 1477 1478 /** 1479 * iscsi_requeue_task - requeue task to run from session workqueue 1480 * @task: task to requeue 1481 * 1482 * LLDs that need to run a task from the session workqueue should call 1483 * this. The session frwd_lock must be held. This should only be called 1484 * by software drivers. 1485 */ 1486 void iscsi_requeue_task(struct iscsi_task *task) 1487 { 1488 struct iscsi_conn *conn = task->conn; 1489 1490 /* 1491 * this may be on the requeue list already if the xmit_task callout 1492 * is handling the r2ts while we are adding new ones 1493 */ 1494 spin_lock_bh(&conn->taskqueuelock); 1495 if (list_empty(&task->running)) 1496 list_add_tail(&task->running, &conn->requeue); 1497 spin_unlock_bh(&conn->taskqueuelock); 1498 iscsi_conn_queue_work(conn); 1499 } 1500 EXPORT_SYMBOL_GPL(iscsi_requeue_task); 1501 1502 /** 1503 * iscsi_data_xmit - xmit any command into the scheduled connection 1504 * @conn: iscsi connection 1505 * 1506 * Notes: 1507 * The function can return -EAGAIN in which case the caller must 1508 * re-schedule it again later or recover. '0' return code means 1509 * successful xmit. 1510 **/ 1511 static int iscsi_data_xmit(struct iscsi_conn *conn) 1512 { 1513 struct iscsi_task *task; 1514 int rc = 0; 1515 1516 spin_lock_bh(&conn->session->frwd_lock); 1517 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) { 1518 ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n"); 1519 spin_unlock_bh(&conn->session->frwd_lock); 1520 return -ENODATA; 1521 } 1522 1523 if (conn->task) { 1524 rc = iscsi_xmit_task(conn); 1525 if (rc) 1526 goto done; 1527 } 1528 1529 /* 1530 * process mgmt pdus like nops before commands since we should 1531 * only have one nop-out as a ping from us and targets should not 1532 * overflow us with nop-ins 1533 */ 1534 spin_lock_bh(&conn->taskqueuelock); 1535 check_mgmt: 1536 while (!list_empty(&conn->mgmtqueue)) { 1537 conn->task = list_entry(conn->mgmtqueue.next, 1538 struct iscsi_task, running); 1539 list_del_init(&conn->task->running); 1540 spin_unlock_bh(&conn->taskqueuelock); 1541 if (iscsi_prep_mgmt_task(conn, conn->task)) { 1542 /* regular RX path uses back_lock */ 1543 spin_lock_bh(&conn->session->back_lock); 1544 __iscsi_put_task(conn->task); 1545 spin_unlock_bh(&conn->session->back_lock); 1546 conn->task = NULL; 1547 spin_lock_bh(&conn->taskqueuelock); 1548 continue; 1549 } 1550 rc = iscsi_xmit_task(conn); 1551 if (rc) 1552 goto done; 1553 spin_lock_bh(&conn->taskqueuelock); 1554 } 1555 1556 /* process pending command queue */ 1557 while (!list_empty(&conn->cmdqueue)) { 1558 conn->task = list_entry(conn->cmdqueue.next, struct iscsi_task, 1559 running); 1560 list_del_init(&conn->task->running); 1561 spin_unlock_bh(&conn->taskqueuelock); 1562 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) { 1563 fail_scsi_task(conn->task, DID_IMM_RETRY); 1564 spin_lock_bh(&conn->taskqueuelock); 1565 continue; 1566 } 1567 rc = iscsi_prep_scsi_cmd_pdu(conn->task); 1568 if (rc) { 1569 if (rc == -ENOMEM || rc == -EACCES) { 1570 spin_lock_bh(&conn->taskqueuelock); 1571 list_add_tail(&conn->task->running, 1572 &conn->cmdqueue); 1573 conn->task = NULL; 1574 spin_unlock_bh(&conn->taskqueuelock); 1575 goto done; 1576 } else 1577 fail_scsi_task(conn->task, DID_ABORT); 1578 spin_lock_bh(&conn->taskqueuelock); 1579 continue; 1580 } 1581 rc = iscsi_xmit_task(conn); 1582 if (rc) 1583 goto done; 1584 /* 1585 * we could continuously get new task requests so 1586 * we need to check the mgmt queue for nops that need to 1587 * be sent to aviod starvation 1588 */ 1589 spin_lock_bh(&conn->taskqueuelock); 1590 if (!list_empty(&conn->mgmtqueue)) 1591 goto check_mgmt; 1592 } 1593 1594 while (!list_empty(&conn->requeue)) { 1595 /* 1596 * we always do fastlogout - conn stop code will clean up. 1597 */ 1598 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) 1599 break; 1600 1601 task = list_entry(conn->requeue.next, struct iscsi_task, 1602 running); 1603 if (iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_DATA_OUT)) 1604 break; 1605 1606 conn->task = task; 1607 list_del_init(&conn->task->running); 1608 conn->task->state = ISCSI_TASK_RUNNING; 1609 spin_unlock_bh(&conn->taskqueuelock); 1610 rc = iscsi_xmit_task(conn); 1611 if (rc) 1612 goto done; 1613 spin_lock_bh(&conn->taskqueuelock); 1614 if (!list_empty(&conn->mgmtqueue)) 1615 goto check_mgmt; 1616 } 1617 spin_unlock_bh(&conn->taskqueuelock); 1618 spin_unlock_bh(&conn->session->frwd_lock); 1619 return -ENODATA; 1620 1621 done: 1622 spin_unlock_bh(&conn->session->frwd_lock); 1623 return rc; 1624 } 1625 1626 static void iscsi_xmitworker(struct work_struct *work) 1627 { 1628 struct iscsi_conn *conn = 1629 container_of(work, struct iscsi_conn, xmitwork); 1630 int rc; 1631 /* 1632 * serialize Xmit worker on a per-connection basis. 1633 */ 1634 do { 1635 rc = iscsi_data_xmit(conn); 1636 } while (rc >= 0 || rc == -EAGAIN); 1637 } 1638 1639 static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn, 1640 struct scsi_cmnd *sc) 1641 { 1642 struct iscsi_task *task; 1643 1644 if (!kfifo_out(&conn->session->cmdpool.queue, 1645 (void *) &task, sizeof(void *))) 1646 return NULL; 1647 1648 sc->SCp.phase = conn->session->age; 1649 sc->SCp.ptr = (char *) task; 1650 1651 refcount_set(&task->refcount, 1); 1652 task->state = ISCSI_TASK_PENDING; 1653 task->conn = conn; 1654 task->sc = sc; 1655 task->have_checked_conn = false; 1656 task->last_timeout = jiffies; 1657 task->last_xfer = jiffies; 1658 task->protected = false; 1659 INIT_LIST_HEAD(&task->running); 1660 return task; 1661 } 1662 1663 enum { 1664 FAILURE_BAD_HOST = 1, 1665 FAILURE_SESSION_FAILED, 1666 FAILURE_SESSION_FREED, 1667 FAILURE_WINDOW_CLOSED, 1668 FAILURE_OOM, 1669 FAILURE_SESSION_TERMINATE, 1670 FAILURE_SESSION_IN_RECOVERY, 1671 FAILURE_SESSION_RECOVERY_TIMEOUT, 1672 FAILURE_SESSION_LOGGING_OUT, 1673 FAILURE_SESSION_NOT_READY, 1674 }; 1675 1676 int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc) 1677 { 1678 struct iscsi_cls_session *cls_session; 1679 struct iscsi_host *ihost; 1680 int reason = 0; 1681 struct iscsi_session *session; 1682 struct iscsi_conn *conn; 1683 struct iscsi_task *task = NULL; 1684 1685 sc->result = 0; 1686 sc->SCp.ptr = NULL; 1687 1688 ihost = shost_priv(host); 1689 1690 cls_session = starget_to_session(scsi_target(sc->device)); 1691 session = cls_session->dd_data; 1692 spin_lock_bh(&session->frwd_lock); 1693 1694 reason = iscsi_session_chkready(cls_session); 1695 if (reason) { 1696 sc->result = reason; 1697 goto fault; 1698 } 1699 1700 if (session->state != ISCSI_STATE_LOGGED_IN) { 1701 /* 1702 * to handle the race between when we set the recovery state 1703 * and block the session we requeue here (commands could 1704 * be entering our queuecommand while a block is starting 1705 * up because the block code is not locked) 1706 */ 1707 switch (session->state) { 1708 case ISCSI_STATE_FAILED: 1709 /* 1710 * cmds should fail during shutdown, if the session 1711 * state is bad, allowing completion to happen 1712 */ 1713 if (unlikely(system_state != SYSTEM_RUNNING)) { 1714 reason = FAILURE_SESSION_FAILED; 1715 sc->result = DID_NO_CONNECT << 16; 1716 break; 1717 } 1718 /* fall through */ 1719 case ISCSI_STATE_IN_RECOVERY: 1720 reason = FAILURE_SESSION_IN_RECOVERY; 1721 sc->result = DID_IMM_RETRY << 16; 1722 break; 1723 case ISCSI_STATE_LOGGING_OUT: 1724 reason = FAILURE_SESSION_LOGGING_OUT; 1725 sc->result = DID_IMM_RETRY << 16; 1726 break; 1727 case ISCSI_STATE_RECOVERY_FAILED: 1728 reason = FAILURE_SESSION_RECOVERY_TIMEOUT; 1729 sc->result = DID_TRANSPORT_FAILFAST << 16; 1730 break; 1731 case ISCSI_STATE_TERMINATE: 1732 reason = FAILURE_SESSION_TERMINATE; 1733 sc->result = DID_NO_CONNECT << 16; 1734 break; 1735 default: 1736 reason = FAILURE_SESSION_FREED; 1737 sc->result = DID_NO_CONNECT << 16; 1738 } 1739 goto fault; 1740 } 1741 1742 conn = session->leadconn; 1743 if (!conn) { 1744 reason = FAILURE_SESSION_FREED; 1745 sc->result = DID_NO_CONNECT << 16; 1746 goto fault; 1747 } 1748 1749 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) { 1750 reason = FAILURE_SESSION_IN_RECOVERY; 1751 sc->result = DID_REQUEUE << 16; 1752 goto fault; 1753 } 1754 1755 if (iscsi_check_cmdsn_window_closed(conn)) { 1756 reason = FAILURE_WINDOW_CLOSED; 1757 goto reject; 1758 } 1759 1760 task = iscsi_alloc_task(conn, sc); 1761 if (!task) { 1762 reason = FAILURE_OOM; 1763 goto reject; 1764 } 1765 1766 if (!ihost->workq) { 1767 reason = iscsi_prep_scsi_cmd_pdu(task); 1768 if (reason) { 1769 if (reason == -ENOMEM || reason == -EACCES) { 1770 reason = FAILURE_OOM; 1771 goto prepd_reject; 1772 } else { 1773 sc->result = DID_ABORT << 16; 1774 goto prepd_fault; 1775 } 1776 } 1777 if (session->tt->xmit_task(task)) { 1778 session->cmdsn--; 1779 reason = FAILURE_SESSION_NOT_READY; 1780 goto prepd_reject; 1781 } 1782 } else { 1783 spin_lock_bh(&conn->taskqueuelock); 1784 list_add_tail(&task->running, &conn->cmdqueue); 1785 spin_unlock_bh(&conn->taskqueuelock); 1786 iscsi_conn_queue_work(conn); 1787 } 1788 1789 session->queued_cmdsn++; 1790 spin_unlock_bh(&session->frwd_lock); 1791 return 0; 1792 1793 prepd_reject: 1794 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ); 1795 reject: 1796 spin_unlock_bh(&session->frwd_lock); 1797 ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n", 1798 sc->cmnd[0], reason); 1799 return SCSI_MLQUEUE_TARGET_BUSY; 1800 1801 prepd_fault: 1802 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ); 1803 fault: 1804 spin_unlock_bh(&session->frwd_lock); 1805 ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n", 1806 sc->cmnd[0], reason); 1807 if (!scsi_bidi_cmnd(sc)) 1808 scsi_set_resid(sc, scsi_bufflen(sc)); 1809 else { 1810 scsi_out(sc)->resid = scsi_out(sc)->length; 1811 scsi_in(sc)->resid = scsi_in(sc)->length; 1812 } 1813 sc->scsi_done(sc); 1814 return 0; 1815 } 1816 EXPORT_SYMBOL_GPL(iscsi_queuecommand); 1817 1818 int iscsi_target_alloc(struct scsi_target *starget) 1819 { 1820 struct iscsi_cls_session *cls_session = starget_to_session(starget); 1821 struct iscsi_session *session = cls_session->dd_data; 1822 1823 starget->can_queue = session->scsi_cmds_max; 1824 return 0; 1825 } 1826 EXPORT_SYMBOL_GPL(iscsi_target_alloc); 1827 1828 static void iscsi_tmf_timedout(struct timer_list *t) 1829 { 1830 struct iscsi_conn *conn = from_timer(conn, t, tmf_timer); 1831 struct iscsi_session *session = conn->session; 1832 1833 spin_lock(&session->frwd_lock); 1834 if (conn->tmf_state == TMF_QUEUED) { 1835 conn->tmf_state = TMF_TIMEDOUT; 1836 ISCSI_DBG_EH(session, "tmf timedout\n"); 1837 /* unblock eh_abort() */ 1838 wake_up(&conn->ehwait); 1839 } 1840 spin_unlock(&session->frwd_lock); 1841 } 1842 1843 static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn, 1844 struct iscsi_tm *hdr, int age, 1845 int timeout) 1846 __must_hold(&session->frwd_lock) 1847 { 1848 struct iscsi_session *session = conn->session; 1849 struct iscsi_task *task; 1850 1851 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr, 1852 NULL, 0); 1853 if (!task) { 1854 spin_unlock_bh(&session->frwd_lock); 1855 iscsi_conn_printk(KERN_ERR, conn, "Could not send TMF.\n"); 1856 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); 1857 spin_lock_bh(&session->frwd_lock); 1858 return -EPERM; 1859 } 1860 conn->tmfcmd_pdus_cnt++; 1861 conn->tmf_timer.expires = timeout * HZ + jiffies; 1862 add_timer(&conn->tmf_timer); 1863 ISCSI_DBG_EH(session, "tmf set timeout\n"); 1864 1865 spin_unlock_bh(&session->frwd_lock); 1866 mutex_unlock(&session->eh_mutex); 1867 1868 /* 1869 * block eh thread until: 1870 * 1871 * 1) tmf response 1872 * 2) tmf timeout 1873 * 3) session is terminated or restarted or userspace has 1874 * given up on recovery 1875 */ 1876 wait_event_interruptible(conn->ehwait, age != session->age || 1877 session->state != ISCSI_STATE_LOGGED_IN || 1878 conn->tmf_state != TMF_QUEUED); 1879 if (signal_pending(current)) 1880 flush_signals(current); 1881 del_timer_sync(&conn->tmf_timer); 1882 1883 mutex_lock(&session->eh_mutex); 1884 spin_lock_bh(&session->frwd_lock); 1885 /* if the session drops it will clean up the task */ 1886 if (age != session->age || 1887 session->state != ISCSI_STATE_LOGGED_IN) 1888 return -ENOTCONN; 1889 return 0; 1890 } 1891 1892 /* 1893 * Fail commands. session lock held and recv side suspended and xmit 1894 * thread flushed 1895 */ 1896 static void fail_scsi_tasks(struct iscsi_conn *conn, u64 lun, int error) 1897 { 1898 struct iscsi_task *task; 1899 int i; 1900 1901 for (i = 0; i < conn->session->cmds_max; i++) { 1902 task = conn->session->cmds[i]; 1903 if (!task->sc || task->state == ISCSI_TASK_FREE) 1904 continue; 1905 1906 if (lun != -1 && lun != task->sc->device->lun) 1907 continue; 1908 1909 ISCSI_DBG_SESSION(conn->session, 1910 "failing sc %p itt 0x%x state %d\n", 1911 task->sc, task->itt, task->state); 1912 fail_scsi_task(task, error); 1913 } 1914 } 1915 1916 /** 1917 * iscsi_suspend_queue - suspend iscsi_queuecommand 1918 * @conn: iscsi conn to stop queueing IO on 1919 * 1920 * This grabs the session frwd_lock to make sure no one is in 1921 * xmit_task/queuecommand, and then sets suspend to prevent 1922 * new commands from being queued. This only needs to be called 1923 * by offload drivers that need to sync a path like ep disconnect 1924 * with the iscsi_queuecommand/xmit_task. To start IO again libiscsi 1925 * will call iscsi_start_tx and iscsi_unblock_session when in FFP. 1926 */ 1927 void iscsi_suspend_queue(struct iscsi_conn *conn) 1928 { 1929 spin_lock_bh(&conn->session->frwd_lock); 1930 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); 1931 spin_unlock_bh(&conn->session->frwd_lock); 1932 } 1933 EXPORT_SYMBOL_GPL(iscsi_suspend_queue); 1934 1935 /** 1936 * iscsi_suspend_tx - suspend iscsi_data_xmit 1937 * @conn: iscsi conn tp stop processing IO on. 1938 * 1939 * This function sets the suspend bit to prevent iscsi_data_xmit 1940 * from sending new IO, and if work is queued on the xmit thread 1941 * it will wait for it to be completed. 1942 */ 1943 void iscsi_suspend_tx(struct iscsi_conn *conn) 1944 { 1945 struct Scsi_Host *shost = conn->session->host; 1946 struct iscsi_host *ihost = shost_priv(shost); 1947 1948 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); 1949 if (ihost->workq) 1950 flush_workqueue(ihost->workq); 1951 } 1952 EXPORT_SYMBOL_GPL(iscsi_suspend_tx); 1953 1954 static void iscsi_start_tx(struct iscsi_conn *conn) 1955 { 1956 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); 1957 iscsi_conn_queue_work(conn); 1958 } 1959 1960 /* 1961 * We want to make sure a ping is in flight. It has timed out. 1962 * And we are not busy processing a pdu that is making 1963 * progress but got started before the ping and is taking a while 1964 * to complete so the ping is just stuck behind it in a queue. 1965 */ 1966 static int iscsi_has_ping_timed_out(struct iscsi_conn *conn) 1967 { 1968 if (conn->ping_task && 1969 time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) + 1970 (conn->ping_timeout * HZ), jiffies)) 1971 return 1; 1972 else 1973 return 0; 1974 } 1975 1976 enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc) 1977 { 1978 enum blk_eh_timer_return rc = BLK_EH_DONE; 1979 struct iscsi_task *task = NULL, *running_task; 1980 struct iscsi_cls_session *cls_session; 1981 struct iscsi_session *session; 1982 struct iscsi_conn *conn; 1983 int i; 1984 1985 cls_session = starget_to_session(scsi_target(sc->device)); 1986 session = cls_session->dd_data; 1987 1988 ISCSI_DBG_EH(session, "scsi cmd %p timedout\n", sc); 1989 1990 spin_lock(&session->frwd_lock); 1991 task = (struct iscsi_task *)sc->SCp.ptr; 1992 if (!task) { 1993 /* 1994 * Raced with completion. Blk layer has taken ownership 1995 * so let timeout code complete it now. 1996 */ 1997 rc = BLK_EH_DONE; 1998 goto done; 1999 } 2000 2001 if (session->state != ISCSI_STATE_LOGGED_IN) { 2002 /* 2003 * During shutdown, if session is prematurely disconnected, 2004 * recovery won't happen and there will be hung cmds. Not 2005 * handling cmds would trigger EH, also bad in this case. 2006 * Instead, handle cmd, allow completion to happen and let 2007 * upper layer to deal with the result. 2008 */ 2009 if (unlikely(system_state != SYSTEM_RUNNING)) { 2010 sc->result = DID_NO_CONNECT << 16; 2011 ISCSI_DBG_EH(session, "sc on shutdown, handled\n"); 2012 rc = BLK_EH_DONE; 2013 goto done; 2014 } 2015 /* 2016 * We are probably in the middle of iscsi recovery so let 2017 * that complete and handle the error. 2018 */ 2019 rc = BLK_EH_RESET_TIMER; 2020 goto done; 2021 } 2022 2023 conn = session->leadconn; 2024 if (!conn) { 2025 /* In the middle of shuting down */ 2026 rc = BLK_EH_RESET_TIMER; 2027 goto done; 2028 } 2029 2030 /* 2031 * If we have sent (at least queued to the network layer) a pdu or 2032 * recvd one for the task since the last timeout ask for 2033 * more time. If on the next timeout we have not made progress 2034 * we can check if it is the task or connection when we send the 2035 * nop as a ping. 2036 */ 2037 if (time_after(task->last_xfer, task->last_timeout)) { 2038 ISCSI_DBG_EH(session, "Command making progress. Asking " 2039 "scsi-ml for more time to complete. " 2040 "Last data xfer at %lu. Last timeout was at " 2041 "%lu\n.", task->last_xfer, task->last_timeout); 2042 task->have_checked_conn = false; 2043 rc = BLK_EH_RESET_TIMER; 2044 goto done; 2045 } 2046 2047 if (!conn->recv_timeout && !conn->ping_timeout) 2048 goto done; 2049 /* 2050 * if the ping timedout then we are in the middle of cleaning up 2051 * and can let the iscsi eh handle it 2052 */ 2053 if (iscsi_has_ping_timed_out(conn)) { 2054 rc = BLK_EH_RESET_TIMER; 2055 goto done; 2056 } 2057 2058 for (i = 0; i < conn->session->cmds_max; i++) { 2059 running_task = conn->session->cmds[i]; 2060 if (!running_task->sc || running_task == task || 2061 running_task->state != ISCSI_TASK_RUNNING) 2062 continue; 2063 2064 /* 2065 * Only check if cmds started before this one have made 2066 * progress, or this could never fail 2067 */ 2068 if (time_after(running_task->sc->jiffies_at_alloc, 2069 task->sc->jiffies_at_alloc)) 2070 continue; 2071 2072 if (time_after(running_task->last_xfer, task->last_timeout)) { 2073 /* 2074 * This task has not made progress, but a task 2075 * started before us has transferred data since 2076 * we started/last-checked. We could be queueing 2077 * too many tasks or the LU is bad. 2078 * 2079 * If the device is bad the cmds ahead of us on 2080 * other devs will complete, and this loop will 2081 * eventually fail starting the scsi eh. 2082 */ 2083 ISCSI_DBG_EH(session, "Command has not made progress " 2084 "but commands ahead of it have. " 2085 "Asking scsi-ml for more time to " 2086 "complete. Our last xfer vs running task " 2087 "last xfer %lu/%lu. Last check %lu.\n", 2088 task->last_xfer, running_task->last_xfer, 2089 task->last_timeout); 2090 rc = BLK_EH_RESET_TIMER; 2091 goto done; 2092 } 2093 } 2094 2095 /* Assumes nop timeout is shorter than scsi cmd timeout */ 2096 if (task->have_checked_conn) 2097 goto done; 2098 2099 /* 2100 * Checking the transport already or nop from a cmd timeout still 2101 * running 2102 */ 2103 if (conn->ping_task) { 2104 task->have_checked_conn = true; 2105 rc = BLK_EH_RESET_TIMER; 2106 goto done; 2107 } 2108 2109 /* Make sure there is a transport check done */ 2110 iscsi_send_nopout(conn, NULL); 2111 task->have_checked_conn = true; 2112 rc = BLK_EH_RESET_TIMER; 2113 2114 done: 2115 if (task) 2116 task->last_timeout = jiffies; 2117 spin_unlock(&session->frwd_lock); 2118 ISCSI_DBG_EH(session, "return %s\n", rc == BLK_EH_RESET_TIMER ? 2119 "timer reset" : "shutdown or nh"); 2120 return rc; 2121 } 2122 EXPORT_SYMBOL_GPL(iscsi_eh_cmd_timed_out); 2123 2124 static void iscsi_check_transport_timeouts(struct timer_list *t) 2125 { 2126 struct iscsi_conn *conn = from_timer(conn, t, transport_timer); 2127 struct iscsi_session *session = conn->session; 2128 unsigned long recv_timeout, next_timeout = 0, last_recv; 2129 2130 spin_lock(&session->frwd_lock); 2131 if (session->state != ISCSI_STATE_LOGGED_IN) 2132 goto done; 2133 2134 recv_timeout = conn->recv_timeout; 2135 if (!recv_timeout) 2136 goto done; 2137 2138 recv_timeout *= HZ; 2139 last_recv = conn->last_recv; 2140 2141 if (iscsi_has_ping_timed_out(conn)) { 2142 iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs " 2143 "expired, recv timeout %d, last rx %lu, " 2144 "last ping %lu, now %lu\n", 2145 conn->ping_timeout, conn->recv_timeout, 2146 last_recv, conn->last_ping, jiffies); 2147 spin_unlock(&session->frwd_lock); 2148 iscsi_conn_failure(conn, ISCSI_ERR_NOP_TIMEDOUT); 2149 return; 2150 } 2151 2152 if (time_before_eq(last_recv + recv_timeout, jiffies)) { 2153 /* send a ping to try to provoke some traffic */ 2154 ISCSI_DBG_CONN(conn, "Sending nopout as ping\n"); 2155 if (iscsi_send_nopout(conn, NULL)) 2156 next_timeout = jiffies + (1 * HZ); 2157 else 2158 next_timeout = conn->last_ping + (conn->ping_timeout * HZ); 2159 } else 2160 next_timeout = last_recv + recv_timeout; 2161 2162 ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout); 2163 mod_timer(&conn->transport_timer, next_timeout); 2164 done: 2165 spin_unlock(&session->frwd_lock); 2166 } 2167 2168 static void iscsi_prep_abort_task_pdu(struct iscsi_task *task, 2169 struct iscsi_tm *hdr) 2170 { 2171 memset(hdr, 0, sizeof(*hdr)); 2172 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; 2173 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK; 2174 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2175 hdr->lun = task->lun; 2176 hdr->rtt = task->hdr_itt; 2177 hdr->refcmdsn = task->cmdsn; 2178 } 2179 2180 int iscsi_eh_abort(struct scsi_cmnd *sc) 2181 { 2182 struct iscsi_cls_session *cls_session; 2183 struct iscsi_session *session; 2184 struct iscsi_conn *conn; 2185 struct iscsi_task *task; 2186 struct iscsi_tm *hdr; 2187 int age; 2188 2189 cls_session = starget_to_session(scsi_target(sc->device)); 2190 session = cls_session->dd_data; 2191 2192 ISCSI_DBG_EH(session, "aborting sc %p\n", sc); 2193 2194 mutex_lock(&session->eh_mutex); 2195 spin_lock_bh(&session->frwd_lock); 2196 /* 2197 * if session was ISCSI_STATE_IN_RECOVERY then we may not have 2198 * got the command. 2199 */ 2200 if (!sc->SCp.ptr) { 2201 ISCSI_DBG_EH(session, "sc never reached iscsi layer or " 2202 "it completed.\n"); 2203 spin_unlock_bh(&session->frwd_lock); 2204 mutex_unlock(&session->eh_mutex); 2205 return SUCCESS; 2206 } 2207 2208 /* 2209 * If we are not logged in or we have started a new session 2210 * then let the host reset code handle this 2211 */ 2212 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN || 2213 sc->SCp.phase != session->age) { 2214 spin_unlock_bh(&session->frwd_lock); 2215 mutex_unlock(&session->eh_mutex); 2216 ISCSI_DBG_EH(session, "failing abort due to dropped " 2217 "session.\n"); 2218 return FAILED; 2219 } 2220 2221 conn = session->leadconn; 2222 conn->eh_abort_cnt++; 2223 age = session->age; 2224 2225 task = (struct iscsi_task *)sc->SCp.ptr; 2226 ISCSI_DBG_EH(session, "aborting [sc %p itt 0x%x]\n", 2227 sc, task->itt); 2228 2229 /* task completed before time out */ 2230 if (!task->sc) { 2231 ISCSI_DBG_EH(session, "sc completed while abort in progress\n"); 2232 goto success; 2233 } 2234 2235 if (task->state == ISCSI_TASK_PENDING) { 2236 fail_scsi_task(task, DID_ABORT); 2237 goto success; 2238 } 2239 2240 /* only have one tmf outstanding at a time */ 2241 if (conn->tmf_state != TMF_INITIAL) 2242 goto failed; 2243 conn->tmf_state = TMF_QUEUED; 2244 2245 hdr = &conn->tmhdr; 2246 iscsi_prep_abort_task_pdu(task, hdr); 2247 2248 if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) 2249 goto failed; 2250 2251 switch (conn->tmf_state) { 2252 case TMF_SUCCESS: 2253 spin_unlock_bh(&session->frwd_lock); 2254 /* 2255 * stop tx side incase the target had sent a abort rsp but 2256 * the initiator was still writing out data. 2257 */ 2258 iscsi_suspend_tx(conn); 2259 /* 2260 * we do not stop the recv side because targets have been 2261 * good and have never sent us a successful tmf response 2262 * then sent more data for the cmd. 2263 */ 2264 spin_lock_bh(&session->frwd_lock); 2265 fail_scsi_task(task, DID_ABORT); 2266 conn->tmf_state = TMF_INITIAL; 2267 memset(hdr, 0, sizeof(*hdr)); 2268 spin_unlock_bh(&session->frwd_lock); 2269 iscsi_start_tx(conn); 2270 goto success_unlocked; 2271 case TMF_TIMEDOUT: 2272 spin_unlock_bh(&session->frwd_lock); 2273 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); 2274 goto failed_unlocked; 2275 case TMF_NOT_FOUND: 2276 if (!sc->SCp.ptr) { 2277 conn->tmf_state = TMF_INITIAL; 2278 memset(hdr, 0, sizeof(*hdr)); 2279 /* task completed before tmf abort response */ 2280 ISCSI_DBG_EH(session, "sc completed while abort in " 2281 "progress\n"); 2282 goto success; 2283 } 2284 /* fall through */ 2285 default: 2286 conn->tmf_state = TMF_INITIAL; 2287 goto failed; 2288 } 2289 2290 success: 2291 spin_unlock_bh(&session->frwd_lock); 2292 success_unlocked: 2293 ISCSI_DBG_EH(session, "abort success [sc %p itt 0x%x]\n", 2294 sc, task->itt); 2295 mutex_unlock(&session->eh_mutex); 2296 return SUCCESS; 2297 2298 failed: 2299 spin_unlock_bh(&session->frwd_lock); 2300 failed_unlocked: 2301 ISCSI_DBG_EH(session, "abort failed [sc %p itt 0x%x]\n", sc, 2302 task ? task->itt : 0); 2303 mutex_unlock(&session->eh_mutex); 2304 return FAILED; 2305 } 2306 EXPORT_SYMBOL_GPL(iscsi_eh_abort); 2307 2308 static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) 2309 { 2310 memset(hdr, 0, sizeof(*hdr)); 2311 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; 2312 hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK; 2313 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2314 int_to_scsilun(sc->device->lun, &hdr->lun); 2315 hdr->rtt = RESERVED_ITT; 2316 } 2317 2318 int iscsi_eh_device_reset(struct scsi_cmnd *sc) 2319 { 2320 struct iscsi_cls_session *cls_session; 2321 struct iscsi_session *session; 2322 struct iscsi_conn *conn; 2323 struct iscsi_tm *hdr; 2324 int rc = FAILED; 2325 2326 cls_session = starget_to_session(scsi_target(sc->device)); 2327 session = cls_session->dd_data; 2328 2329 ISCSI_DBG_EH(session, "LU Reset [sc %p lun %llu]\n", sc, 2330 sc->device->lun); 2331 2332 mutex_lock(&session->eh_mutex); 2333 spin_lock_bh(&session->frwd_lock); 2334 /* 2335 * Just check if we are not logged in. We cannot check for 2336 * the phase because the reset could come from a ioctl. 2337 */ 2338 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) 2339 goto unlock; 2340 conn = session->leadconn; 2341 2342 /* only have one tmf outstanding at a time */ 2343 if (conn->tmf_state != TMF_INITIAL) 2344 goto unlock; 2345 conn->tmf_state = TMF_QUEUED; 2346 2347 hdr = &conn->tmhdr; 2348 iscsi_prep_lun_reset_pdu(sc, hdr); 2349 2350 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, 2351 session->lu_reset_timeout)) { 2352 rc = FAILED; 2353 goto unlock; 2354 } 2355 2356 switch (conn->tmf_state) { 2357 case TMF_SUCCESS: 2358 break; 2359 case TMF_TIMEDOUT: 2360 spin_unlock_bh(&session->frwd_lock); 2361 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); 2362 goto done; 2363 default: 2364 conn->tmf_state = TMF_INITIAL; 2365 goto unlock; 2366 } 2367 2368 rc = SUCCESS; 2369 spin_unlock_bh(&session->frwd_lock); 2370 2371 iscsi_suspend_tx(conn); 2372 2373 spin_lock_bh(&session->frwd_lock); 2374 memset(hdr, 0, sizeof(*hdr)); 2375 fail_scsi_tasks(conn, sc->device->lun, DID_ERROR); 2376 conn->tmf_state = TMF_INITIAL; 2377 spin_unlock_bh(&session->frwd_lock); 2378 2379 iscsi_start_tx(conn); 2380 goto done; 2381 2382 unlock: 2383 spin_unlock_bh(&session->frwd_lock); 2384 done: 2385 ISCSI_DBG_EH(session, "dev reset result = %s\n", 2386 rc == SUCCESS ? "SUCCESS" : "FAILED"); 2387 mutex_unlock(&session->eh_mutex); 2388 return rc; 2389 } 2390 EXPORT_SYMBOL_GPL(iscsi_eh_device_reset); 2391 2392 void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session) 2393 { 2394 struct iscsi_session *session = cls_session->dd_data; 2395 2396 spin_lock_bh(&session->frwd_lock); 2397 if (session->state != ISCSI_STATE_LOGGED_IN) { 2398 session->state = ISCSI_STATE_RECOVERY_FAILED; 2399 if (session->leadconn) 2400 wake_up(&session->leadconn->ehwait); 2401 } 2402 spin_unlock_bh(&session->frwd_lock); 2403 } 2404 EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout); 2405 2406 /** 2407 * iscsi_eh_session_reset - drop session and attempt relogin 2408 * @sc: scsi command 2409 * 2410 * This function will wait for a relogin, session termination from 2411 * userspace, or a recovery/replacement timeout. 2412 */ 2413 int iscsi_eh_session_reset(struct scsi_cmnd *sc) 2414 { 2415 struct iscsi_cls_session *cls_session; 2416 struct iscsi_session *session; 2417 struct iscsi_conn *conn; 2418 2419 cls_session = starget_to_session(scsi_target(sc->device)); 2420 session = cls_session->dd_data; 2421 conn = session->leadconn; 2422 2423 mutex_lock(&session->eh_mutex); 2424 spin_lock_bh(&session->frwd_lock); 2425 if (session->state == ISCSI_STATE_TERMINATE) { 2426 failed: 2427 ISCSI_DBG_EH(session, 2428 "failing session reset: Could not log back into " 2429 "%s [age %d]\n", session->targetname, 2430 session->age); 2431 spin_unlock_bh(&session->frwd_lock); 2432 mutex_unlock(&session->eh_mutex); 2433 return FAILED; 2434 } 2435 2436 spin_unlock_bh(&session->frwd_lock); 2437 mutex_unlock(&session->eh_mutex); 2438 /* 2439 * we drop the lock here but the leadconn cannot be destoyed while 2440 * we are in the scsi eh 2441 */ 2442 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); 2443 2444 ISCSI_DBG_EH(session, "wait for relogin\n"); 2445 wait_event_interruptible(conn->ehwait, 2446 session->state == ISCSI_STATE_TERMINATE || 2447 session->state == ISCSI_STATE_LOGGED_IN || 2448 session->state == ISCSI_STATE_RECOVERY_FAILED); 2449 if (signal_pending(current)) 2450 flush_signals(current); 2451 2452 mutex_lock(&session->eh_mutex); 2453 spin_lock_bh(&session->frwd_lock); 2454 if (session->state == ISCSI_STATE_LOGGED_IN) { 2455 ISCSI_DBG_EH(session, 2456 "session reset succeeded for %s,%s\n", 2457 session->targetname, conn->persistent_address); 2458 } else 2459 goto failed; 2460 spin_unlock_bh(&session->frwd_lock); 2461 mutex_unlock(&session->eh_mutex); 2462 return SUCCESS; 2463 } 2464 EXPORT_SYMBOL_GPL(iscsi_eh_session_reset); 2465 2466 static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) 2467 { 2468 memset(hdr, 0, sizeof(*hdr)); 2469 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; 2470 hdr->flags = ISCSI_TM_FUNC_TARGET_WARM_RESET & ISCSI_FLAG_TM_FUNC_MASK; 2471 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2472 hdr->rtt = RESERVED_ITT; 2473 } 2474 2475 /** 2476 * iscsi_eh_target_reset - reset target 2477 * @sc: scsi command 2478 * 2479 * This will attempt to send a warm target reset. 2480 */ 2481 static int iscsi_eh_target_reset(struct scsi_cmnd *sc) 2482 { 2483 struct iscsi_cls_session *cls_session; 2484 struct iscsi_session *session; 2485 struct iscsi_conn *conn; 2486 struct iscsi_tm *hdr; 2487 int rc = FAILED; 2488 2489 cls_session = starget_to_session(scsi_target(sc->device)); 2490 session = cls_session->dd_data; 2491 2492 ISCSI_DBG_EH(session, "tgt Reset [sc %p tgt %s]\n", sc, 2493 session->targetname); 2494 2495 mutex_lock(&session->eh_mutex); 2496 spin_lock_bh(&session->frwd_lock); 2497 /* 2498 * Just check if we are not logged in. We cannot check for 2499 * the phase because the reset could come from a ioctl. 2500 */ 2501 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) 2502 goto unlock; 2503 conn = session->leadconn; 2504 2505 /* only have one tmf outstanding at a time */ 2506 if (conn->tmf_state != TMF_INITIAL) 2507 goto unlock; 2508 conn->tmf_state = TMF_QUEUED; 2509 2510 hdr = &conn->tmhdr; 2511 iscsi_prep_tgt_reset_pdu(sc, hdr); 2512 2513 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, 2514 session->tgt_reset_timeout)) { 2515 rc = FAILED; 2516 goto unlock; 2517 } 2518 2519 switch (conn->tmf_state) { 2520 case TMF_SUCCESS: 2521 break; 2522 case TMF_TIMEDOUT: 2523 spin_unlock_bh(&session->frwd_lock); 2524 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); 2525 goto done; 2526 default: 2527 conn->tmf_state = TMF_INITIAL; 2528 goto unlock; 2529 } 2530 2531 rc = SUCCESS; 2532 spin_unlock_bh(&session->frwd_lock); 2533 2534 iscsi_suspend_tx(conn); 2535 2536 spin_lock_bh(&session->frwd_lock); 2537 memset(hdr, 0, sizeof(*hdr)); 2538 fail_scsi_tasks(conn, -1, DID_ERROR); 2539 conn->tmf_state = TMF_INITIAL; 2540 spin_unlock_bh(&session->frwd_lock); 2541 2542 iscsi_start_tx(conn); 2543 goto done; 2544 2545 unlock: 2546 spin_unlock_bh(&session->frwd_lock); 2547 done: 2548 ISCSI_DBG_EH(session, "tgt %s reset result = %s\n", session->targetname, 2549 rc == SUCCESS ? "SUCCESS" : "FAILED"); 2550 mutex_unlock(&session->eh_mutex); 2551 return rc; 2552 } 2553 2554 /** 2555 * iscsi_eh_recover_target - reset target and possibly the session 2556 * @sc: scsi command 2557 * 2558 * This will attempt to send a warm target reset. If that fails, 2559 * we will escalate to ERL0 session recovery. 2560 */ 2561 int iscsi_eh_recover_target(struct scsi_cmnd *sc) 2562 { 2563 int rc; 2564 2565 rc = iscsi_eh_target_reset(sc); 2566 if (rc == FAILED) 2567 rc = iscsi_eh_session_reset(sc); 2568 return rc; 2569 } 2570 EXPORT_SYMBOL_GPL(iscsi_eh_recover_target); 2571 2572 /* 2573 * Pre-allocate a pool of @max items of @item_size. By default, the pool 2574 * should be accessed via kfifo_{get,put} on q->queue. 2575 * Optionally, the caller can obtain the array of object pointers 2576 * by passing in a non-NULL @items pointer 2577 */ 2578 int 2579 iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size) 2580 { 2581 int i, num_arrays = 1; 2582 2583 memset(q, 0, sizeof(*q)); 2584 2585 q->max = max; 2586 2587 /* If the user passed an items pointer, he wants a copy of 2588 * the array. */ 2589 if (items) 2590 num_arrays++; 2591 q->pool = kvcalloc(num_arrays * max, sizeof(void *), GFP_KERNEL); 2592 if (q->pool == NULL) 2593 return -ENOMEM; 2594 2595 kfifo_init(&q->queue, (void*)q->pool, max * sizeof(void*)); 2596 2597 for (i = 0; i < max; i++) { 2598 q->pool[i] = kzalloc(item_size, GFP_KERNEL); 2599 if (q->pool[i] == NULL) { 2600 q->max = i; 2601 goto enomem; 2602 } 2603 kfifo_in(&q->queue, (void*)&q->pool[i], sizeof(void*)); 2604 } 2605 2606 if (items) { 2607 *items = q->pool + max; 2608 memcpy(*items, q->pool, max * sizeof(void *)); 2609 } 2610 2611 return 0; 2612 2613 enomem: 2614 iscsi_pool_free(q); 2615 return -ENOMEM; 2616 } 2617 EXPORT_SYMBOL_GPL(iscsi_pool_init); 2618 2619 void iscsi_pool_free(struct iscsi_pool *q) 2620 { 2621 int i; 2622 2623 for (i = 0; i < q->max; i++) 2624 kfree(q->pool[i]); 2625 kvfree(q->pool); 2626 } 2627 EXPORT_SYMBOL_GPL(iscsi_pool_free); 2628 2629 /** 2630 * iscsi_host_add - add host to system 2631 * @shost: scsi host 2632 * @pdev: parent device 2633 * 2634 * This should be called by partial offload and software iscsi drivers 2635 * to add a host to the system. 2636 */ 2637 int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev) 2638 { 2639 if (!shost->can_queue) 2640 shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX; 2641 2642 if (!shost->cmd_per_lun) 2643 shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN; 2644 2645 return scsi_add_host(shost, pdev); 2646 } 2647 EXPORT_SYMBOL_GPL(iscsi_host_add); 2648 2649 /** 2650 * iscsi_host_alloc - allocate a host and driver data 2651 * @sht: scsi host template 2652 * @dd_data_size: driver host data size 2653 * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue 2654 * 2655 * This should be called by partial offload and software iscsi drivers. 2656 * To access the driver specific memory use the iscsi_host_priv() macro. 2657 */ 2658 struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht, 2659 int dd_data_size, bool xmit_can_sleep) 2660 { 2661 struct Scsi_Host *shost; 2662 struct iscsi_host *ihost; 2663 2664 shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size); 2665 if (!shost) 2666 return NULL; 2667 ihost = shost_priv(shost); 2668 2669 if (xmit_can_sleep) { 2670 snprintf(ihost->workq_name, sizeof(ihost->workq_name), 2671 "iscsi_q_%d", shost->host_no); 2672 ihost->workq = create_singlethread_workqueue(ihost->workq_name); 2673 if (!ihost->workq) 2674 goto free_host; 2675 } 2676 2677 spin_lock_init(&ihost->lock); 2678 ihost->state = ISCSI_HOST_SETUP; 2679 ihost->num_sessions = 0; 2680 init_waitqueue_head(&ihost->session_removal_wq); 2681 return shost; 2682 2683 free_host: 2684 scsi_host_put(shost); 2685 return NULL; 2686 } 2687 EXPORT_SYMBOL_GPL(iscsi_host_alloc); 2688 2689 static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session) 2690 { 2691 iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST); 2692 } 2693 2694 /** 2695 * iscsi_host_remove - remove host and sessions 2696 * @shost: scsi host 2697 * 2698 * If there are any sessions left, this will initiate the removal and wait 2699 * for the completion. 2700 */ 2701 void iscsi_host_remove(struct Scsi_Host *shost) 2702 { 2703 struct iscsi_host *ihost = shost_priv(shost); 2704 unsigned long flags; 2705 2706 spin_lock_irqsave(&ihost->lock, flags); 2707 ihost->state = ISCSI_HOST_REMOVED; 2708 spin_unlock_irqrestore(&ihost->lock, flags); 2709 2710 iscsi_host_for_each_session(shost, iscsi_notify_host_removed); 2711 wait_event_interruptible(ihost->session_removal_wq, 2712 ihost->num_sessions == 0); 2713 if (signal_pending(current)) 2714 flush_signals(current); 2715 2716 scsi_remove_host(shost); 2717 if (ihost->workq) 2718 destroy_workqueue(ihost->workq); 2719 } 2720 EXPORT_SYMBOL_GPL(iscsi_host_remove); 2721 2722 void iscsi_host_free(struct Scsi_Host *shost) 2723 { 2724 struct iscsi_host *ihost = shost_priv(shost); 2725 2726 kfree(ihost->netdev); 2727 kfree(ihost->hwaddress); 2728 kfree(ihost->initiatorname); 2729 scsi_host_put(shost); 2730 } 2731 EXPORT_SYMBOL_GPL(iscsi_host_free); 2732 2733 static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost) 2734 { 2735 struct iscsi_host *ihost = shost_priv(shost); 2736 unsigned long flags; 2737 2738 shost = scsi_host_get(shost); 2739 if (!shost) { 2740 printk(KERN_ERR "Invalid state. Cannot notify host removal " 2741 "of session teardown event because host already " 2742 "removed.\n"); 2743 return; 2744 } 2745 2746 spin_lock_irqsave(&ihost->lock, flags); 2747 ihost->num_sessions--; 2748 if (ihost->num_sessions == 0) 2749 wake_up(&ihost->session_removal_wq); 2750 spin_unlock_irqrestore(&ihost->lock, flags); 2751 scsi_host_put(shost); 2752 } 2753 2754 /** 2755 * iscsi_session_setup - create iscsi cls session and host and session 2756 * @iscsit: iscsi transport template 2757 * @shost: scsi host 2758 * @cmds_max: session can queue 2759 * @dd_size: private driver data size, added to session allocation size 2760 * @cmd_task_size: LLD task private data size 2761 * @initial_cmdsn: initial CmdSN 2762 * @id: target ID to add to this session 2763 * 2764 * This can be used by software iscsi_transports that allocate 2765 * a session per scsi host. 2766 * 2767 * Callers should set cmds_max to the largest total numer (mgmt + scsi) of 2768 * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks 2769 * for nop handling and login/logout requests. 2770 */ 2771 struct iscsi_cls_session * 2772 iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost, 2773 uint16_t cmds_max, int dd_size, int cmd_task_size, 2774 uint32_t initial_cmdsn, unsigned int id) 2775 { 2776 struct iscsi_host *ihost = shost_priv(shost); 2777 struct iscsi_session *session; 2778 struct iscsi_cls_session *cls_session; 2779 int cmd_i, scsi_cmds, total_cmds = cmds_max; 2780 unsigned long flags; 2781 2782 spin_lock_irqsave(&ihost->lock, flags); 2783 if (ihost->state == ISCSI_HOST_REMOVED) { 2784 spin_unlock_irqrestore(&ihost->lock, flags); 2785 return NULL; 2786 } 2787 ihost->num_sessions++; 2788 spin_unlock_irqrestore(&ihost->lock, flags); 2789 2790 if (!total_cmds) 2791 total_cmds = ISCSI_DEF_XMIT_CMDS_MAX; 2792 /* 2793 * The iscsi layer needs some tasks for nop handling and tmfs, 2794 * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX 2795 * + 1 command for scsi IO. 2796 */ 2797 if (total_cmds < ISCSI_TOTAL_CMDS_MIN) { 2798 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " 2799 "must be a power of two that is at least %d.\n", 2800 total_cmds, ISCSI_TOTAL_CMDS_MIN); 2801 goto dec_session_count; 2802 } 2803 2804 if (total_cmds > ISCSI_TOTAL_CMDS_MAX) { 2805 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " 2806 "must be a power of 2 less than or equal to %d.\n", 2807 cmds_max, ISCSI_TOTAL_CMDS_MAX); 2808 total_cmds = ISCSI_TOTAL_CMDS_MAX; 2809 } 2810 2811 if (!is_power_of_2(total_cmds)) { 2812 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " 2813 "must be a power of 2.\n", total_cmds); 2814 total_cmds = rounddown_pow_of_two(total_cmds); 2815 if (total_cmds < ISCSI_TOTAL_CMDS_MIN) 2816 return NULL; 2817 printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n", 2818 total_cmds); 2819 } 2820 scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX; 2821 2822 cls_session = iscsi_alloc_session(shost, iscsit, 2823 sizeof(struct iscsi_session) + 2824 dd_size); 2825 if (!cls_session) 2826 goto dec_session_count; 2827 session = cls_session->dd_data; 2828 session->cls_session = cls_session; 2829 session->host = shost; 2830 session->state = ISCSI_STATE_FREE; 2831 session->fast_abort = 1; 2832 session->tgt_reset_timeout = 30; 2833 session->lu_reset_timeout = 15; 2834 session->abort_timeout = 10; 2835 session->scsi_cmds_max = scsi_cmds; 2836 session->cmds_max = total_cmds; 2837 session->queued_cmdsn = session->cmdsn = initial_cmdsn; 2838 session->exp_cmdsn = initial_cmdsn + 1; 2839 session->max_cmdsn = initial_cmdsn + 1; 2840 session->max_r2t = 1; 2841 session->tt = iscsit; 2842 session->dd_data = cls_session->dd_data + sizeof(*session); 2843 2844 mutex_init(&session->eh_mutex); 2845 spin_lock_init(&session->frwd_lock); 2846 spin_lock_init(&session->back_lock); 2847 2848 /* initialize SCSI PDU commands pool */ 2849 if (iscsi_pool_init(&session->cmdpool, session->cmds_max, 2850 (void***)&session->cmds, 2851 cmd_task_size + sizeof(struct iscsi_task))) 2852 goto cmdpool_alloc_fail; 2853 2854 /* pre-format cmds pool with ITT */ 2855 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { 2856 struct iscsi_task *task = session->cmds[cmd_i]; 2857 2858 if (cmd_task_size) 2859 task->dd_data = &task[1]; 2860 task->itt = cmd_i; 2861 task->state = ISCSI_TASK_FREE; 2862 INIT_LIST_HEAD(&task->running); 2863 } 2864 2865 if (!try_module_get(iscsit->owner)) 2866 goto module_get_fail; 2867 2868 if (iscsi_add_session(cls_session, id)) 2869 goto cls_session_fail; 2870 2871 return cls_session; 2872 2873 cls_session_fail: 2874 module_put(iscsit->owner); 2875 module_get_fail: 2876 iscsi_pool_free(&session->cmdpool); 2877 cmdpool_alloc_fail: 2878 iscsi_free_session(cls_session); 2879 dec_session_count: 2880 iscsi_host_dec_session_cnt(shost); 2881 return NULL; 2882 } 2883 EXPORT_SYMBOL_GPL(iscsi_session_setup); 2884 2885 /** 2886 * iscsi_session_teardown - destroy session, host, and cls_session 2887 * @cls_session: iscsi session 2888 */ 2889 void iscsi_session_teardown(struct iscsi_cls_session *cls_session) 2890 { 2891 struct iscsi_session *session = cls_session->dd_data; 2892 struct module *owner = cls_session->transport->owner; 2893 struct Scsi_Host *shost = session->host; 2894 2895 iscsi_pool_free(&session->cmdpool); 2896 2897 iscsi_remove_session(cls_session); 2898 2899 kfree(session->password); 2900 kfree(session->password_in); 2901 kfree(session->username); 2902 kfree(session->username_in); 2903 kfree(session->targetname); 2904 kfree(session->targetalias); 2905 kfree(session->initiatorname); 2906 kfree(session->boot_root); 2907 kfree(session->boot_nic); 2908 kfree(session->boot_target); 2909 kfree(session->ifacename); 2910 kfree(session->portal_type); 2911 kfree(session->discovery_parent_type); 2912 2913 iscsi_free_session(cls_session); 2914 2915 iscsi_host_dec_session_cnt(shost); 2916 module_put(owner); 2917 } 2918 EXPORT_SYMBOL_GPL(iscsi_session_teardown); 2919 2920 /** 2921 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn 2922 * @cls_session: iscsi_cls_session 2923 * @dd_size: private driver data size 2924 * @conn_idx: cid 2925 */ 2926 struct iscsi_cls_conn * 2927 iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size, 2928 uint32_t conn_idx) 2929 { 2930 struct iscsi_session *session = cls_session->dd_data; 2931 struct iscsi_conn *conn; 2932 struct iscsi_cls_conn *cls_conn; 2933 char *data; 2934 2935 cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size, 2936 conn_idx); 2937 if (!cls_conn) 2938 return NULL; 2939 conn = cls_conn->dd_data; 2940 memset(conn, 0, sizeof(*conn) + dd_size); 2941 2942 conn->dd_data = cls_conn->dd_data + sizeof(*conn); 2943 conn->session = session; 2944 conn->cls_conn = cls_conn; 2945 conn->c_stage = ISCSI_CONN_INITIAL_STAGE; 2946 conn->id = conn_idx; 2947 conn->exp_statsn = 0; 2948 conn->tmf_state = TMF_INITIAL; 2949 2950 timer_setup(&conn->transport_timer, iscsi_check_transport_timeouts, 0); 2951 2952 INIT_LIST_HEAD(&conn->mgmtqueue); 2953 INIT_LIST_HEAD(&conn->cmdqueue); 2954 INIT_LIST_HEAD(&conn->requeue); 2955 spin_lock_init(&conn->taskqueuelock); 2956 INIT_WORK(&conn->xmitwork, iscsi_xmitworker); 2957 2958 /* allocate login_task used for the login/text sequences */ 2959 spin_lock_bh(&session->frwd_lock); 2960 if (!kfifo_out(&session->cmdpool.queue, 2961 (void*)&conn->login_task, 2962 sizeof(void*))) { 2963 spin_unlock_bh(&session->frwd_lock); 2964 goto login_task_alloc_fail; 2965 } 2966 spin_unlock_bh(&session->frwd_lock); 2967 2968 data = (char *) __get_free_pages(GFP_KERNEL, 2969 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); 2970 if (!data) 2971 goto login_task_data_alloc_fail; 2972 conn->login_task->data = conn->data = data; 2973 2974 timer_setup(&conn->tmf_timer, iscsi_tmf_timedout, 0); 2975 init_waitqueue_head(&conn->ehwait); 2976 2977 return cls_conn; 2978 2979 login_task_data_alloc_fail: 2980 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task, 2981 sizeof(void*)); 2982 login_task_alloc_fail: 2983 iscsi_destroy_conn(cls_conn); 2984 return NULL; 2985 } 2986 EXPORT_SYMBOL_GPL(iscsi_conn_setup); 2987 2988 /** 2989 * iscsi_conn_teardown - teardown iscsi connection 2990 * @cls_conn: iscsi class connection 2991 * 2992 * TODO: we may need to make this into a two step process 2993 * like scsi-mls remove + put host 2994 */ 2995 void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) 2996 { 2997 struct iscsi_conn *conn = cls_conn->dd_data; 2998 struct iscsi_session *session = conn->session; 2999 3000 del_timer_sync(&conn->transport_timer); 3001 3002 mutex_lock(&session->eh_mutex); 3003 spin_lock_bh(&session->frwd_lock); 3004 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT; 3005 if (session->leadconn == conn) { 3006 /* 3007 * leading connection? then give up on recovery. 3008 */ 3009 session->state = ISCSI_STATE_TERMINATE; 3010 wake_up(&conn->ehwait); 3011 } 3012 spin_unlock_bh(&session->frwd_lock); 3013 3014 /* flush queued up work because we free the connection below */ 3015 iscsi_suspend_tx(conn); 3016 3017 spin_lock_bh(&session->frwd_lock); 3018 free_pages((unsigned long) conn->data, 3019 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); 3020 kfree(conn->persistent_address); 3021 kfree(conn->local_ipaddr); 3022 /* regular RX path uses back_lock */ 3023 spin_lock_bh(&session->back_lock); 3024 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task, 3025 sizeof(void*)); 3026 spin_unlock_bh(&session->back_lock); 3027 if (session->leadconn == conn) 3028 session->leadconn = NULL; 3029 spin_unlock_bh(&session->frwd_lock); 3030 mutex_unlock(&session->eh_mutex); 3031 3032 iscsi_destroy_conn(cls_conn); 3033 } 3034 EXPORT_SYMBOL_GPL(iscsi_conn_teardown); 3035 3036 int iscsi_conn_start(struct iscsi_cls_conn *cls_conn) 3037 { 3038 struct iscsi_conn *conn = cls_conn->dd_data; 3039 struct iscsi_session *session = conn->session; 3040 3041 if (!session) { 3042 iscsi_conn_printk(KERN_ERR, conn, 3043 "can't start unbound connection\n"); 3044 return -EPERM; 3045 } 3046 3047 if ((session->imm_data_en || !session->initial_r2t_en) && 3048 session->first_burst > session->max_burst) { 3049 iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: " 3050 "first_burst %d max_burst %d\n", 3051 session->first_burst, session->max_burst); 3052 return -EINVAL; 3053 } 3054 3055 if (conn->ping_timeout && !conn->recv_timeout) { 3056 iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of " 3057 "zero. Using 5 seconds\n."); 3058 conn->recv_timeout = 5; 3059 } 3060 3061 if (conn->recv_timeout && !conn->ping_timeout) { 3062 iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of " 3063 "zero. Using 5 seconds.\n"); 3064 conn->ping_timeout = 5; 3065 } 3066 3067 spin_lock_bh(&session->frwd_lock); 3068 conn->c_stage = ISCSI_CONN_STARTED; 3069 session->state = ISCSI_STATE_LOGGED_IN; 3070 session->queued_cmdsn = session->cmdsn; 3071 3072 conn->last_recv = jiffies; 3073 conn->last_ping = jiffies; 3074 if (conn->recv_timeout && conn->ping_timeout) 3075 mod_timer(&conn->transport_timer, 3076 jiffies + (conn->recv_timeout * HZ)); 3077 3078 switch(conn->stop_stage) { 3079 case STOP_CONN_RECOVER: 3080 /* 3081 * unblock eh_abort() if it is blocked. re-try all 3082 * commands after successful recovery 3083 */ 3084 conn->stop_stage = 0; 3085 conn->tmf_state = TMF_INITIAL; 3086 session->age++; 3087 if (session->age == 16) 3088 session->age = 0; 3089 break; 3090 case STOP_CONN_TERM: 3091 conn->stop_stage = 0; 3092 break; 3093 default: 3094 break; 3095 } 3096 spin_unlock_bh(&session->frwd_lock); 3097 3098 iscsi_unblock_session(session->cls_session); 3099 wake_up(&conn->ehwait); 3100 return 0; 3101 } 3102 EXPORT_SYMBOL_GPL(iscsi_conn_start); 3103 3104 static void 3105 fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn) 3106 { 3107 struct iscsi_task *task; 3108 int i, state; 3109 3110 for (i = 0; i < conn->session->cmds_max; i++) { 3111 task = conn->session->cmds[i]; 3112 if (task->sc) 3113 continue; 3114 3115 if (task->state == ISCSI_TASK_FREE) 3116 continue; 3117 3118 ISCSI_DBG_SESSION(conn->session, 3119 "failing mgmt itt 0x%x state %d\n", 3120 task->itt, task->state); 3121 state = ISCSI_TASK_ABRT_SESS_RECOV; 3122 if (task->state == ISCSI_TASK_PENDING) 3123 state = ISCSI_TASK_COMPLETED; 3124 iscsi_complete_task(task, state); 3125 3126 } 3127 } 3128 3129 static void iscsi_start_session_recovery(struct iscsi_session *session, 3130 struct iscsi_conn *conn, int flag) 3131 { 3132 int old_stop_stage; 3133 3134 mutex_lock(&session->eh_mutex); 3135 spin_lock_bh(&session->frwd_lock); 3136 if (conn->stop_stage == STOP_CONN_TERM) { 3137 spin_unlock_bh(&session->frwd_lock); 3138 mutex_unlock(&session->eh_mutex); 3139 return; 3140 } 3141 3142 /* 3143 * When this is called for the in_login state, we only want to clean 3144 * up the login task and connection. We do not need to block and set 3145 * the recovery state again 3146 */ 3147 if (flag == STOP_CONN_TERM) 3148 session->state = ISCSI_STATE_TERMINATE; 3149 else if (conn->stop_stage != STOP_CONN_RECOVER) 3150 session->state = ISCSI_STATE_IN_RECOVERY; 3151 3152 old_stop_stage = conn->stop_stage; 3153 conn->stop_stage = flag; 3154 spin_unlock_bh(&session->frwd_lock); 3155 3156 del_timer_sync(&conn->transport_timer); 3157 iscsi_suspend_tx(conn); 3158 3159 spin_lock_bh(&session->frwd_lock); 3160 conn->c_stage = ISCSI_CONN_STOPPED; 3161 spin_unlock_bh(&session->frwd_lock); 3162 3163 /* 3164 * for connection level recovery we should not calculate 3165 * header digest. conn->hdr_size used for optimization 3166 * in hdr_extract() and will be re-negotiated at 3167 * set_param() time. 3168 */ 3169 if (flag == STOP_CONN_RECOVER) { 3170 conn->hdrdgst_en = 0; 3171 conn->datadgst_en = 0; 3172 if (session->state == ISCSI_STATE_IN_RECOVERY && 3173 old_stop_stage != STOP_CONN_RECOVER) { 3174 ISCSI_DBG_SESSION(session, "blocking session\n"); 3175 iscsi_block_session(session->cls_session); 3176 } 3177 } 3178 3179 /* 3180 * flush queues. 3181 */ 3182 spin_lock_bh(&session->frwd_lock); 3183 fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED); 3184 fail_mgmt_tasks(session, conn); 3185 memset(&conn->tmhdr, 0, sizeof(conn->tmhdr)); 3186 spin_unlock_bh(&session->frwd_lock); 3187 mutex_unlock(&session->eh_mutex); 3188 } 3189 3190 void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) 3191 { 3192 struct iscsi_conn *conn = cls_conn->dd_data; 3193 struct iscsi_session *session = conn->session; 3194 3195 switch (flag) { 3196 case STOP_CONN_RECOVER: 3197 case STOP_CONN_TERM: 3198 iscsi_start_session_recovery(session, conn, flag); 3199 break; 3200 default: 3201 iscsi_conn_printk(KERN_ERR, conn, 3202 "invalid stop flag %d\n", flag); 3203 } 3204 } 3205 EXPORT_SYMBOL_GPL(iscsi_conn_stop); 3206 3207 int iscsi_conn_bind(struct iscsi_cls_session *cls_session, 3208 struct iscsi_cls_conn *cls_conn, int is_leading) 3209 { 3210 struct iscsi_session *session = cls_session->dd_data; 3211 struct iscsi_conn *conn = cls_conn->dd_data; 3212 3213 spin_lock_bh(&session->frwd_lock); 3214 if (is_leading) 3215 session->leadconn = conn; 3216 spin_unlock_bh(&session->frwd_lock); 3217 3218 /* 3219 * Unblock xmitworker(), Login Phase will pass through. 3220 */ 3221 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); 3222 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); 3223 return 0; 3224 } 3225 EXPORT_SYMBOL_GPL(iscsi_conn_bind); 3226 3227 int iscsi_switch_str_param(char **param, char *new_val_buf) 3228 { 3229 char *new_val; 3230 3231 if (*param) { 3232 if (!strcmp(*param, new_val_buf)) 3233 return 0; 3234 } 3235 3236 new_val = kstrdup(new_val_buf, GFP_NOIO); 3237 if (!new_val) 3238 return -ENOMEM; 3239 3240 kfree(*param); 3241 *param = new_val; 3242 return 0; 3243 } 3244 EXPORT_SYMBOL_GPL(iscsi_switch_str_param); 3245 3246 int iscsi_set_param(struct iscsi_cls_conn *cls_conn, 3247 enum iscsi_param param, char *buf, int buflen) 3248 { 3249 struct iscsi_conn *conn = cls_conn->dd_data; 3250 struct iscsi_session *session = conn->session; 3251 int val; 3252 3253 switch(param) { 3254 case ISCSI_PARAM_FAST_ABORT: 3255 sscanf(buf, "%d", &session->fast_abort); 3256 break; 3257 case ISCSI_PARAM_ABORT_TMO: 3258 sscanf(buf, "%d", &session->abort_timeout); 3259 break; 3260 case ISCSI_PARAM_LU_RESET_TMO: 3261 sscanf(buf, "%d", &session->lu_reset_timeout); 3262 break; 3263 case ISCSI_PARAM_TGT_RESET_TMO: 3264 sscanf(buf, "%d", &session->tgt_reset_timeout); 3265 break; 3266 case ISCSI_PARAM_PING_TMO: 3267 sscanf(buf, "%d", &conn->ping_timeout); 3268 break; 3269 case ISCSI_PARAM_RECV_TMO: 3270 sscanf(buf, "%d", &conn->recv_timeout); 3271 break; 3272 case ISCSI_PARAM_MAX_RECV_DLENGTH: 3273 sscanf(buf, "%d", &conn->max_recv_dlength); 3274 break; 3275 case ISCSI_PARAM_MAX_XMIT_DLENGTH: 3276 sscanf(buf, "%d", &conn->max_xmit_dlength); 3277 break; 3278 case ISCSI_PARAM_HDRDGST_EN: 3279 sscanf(buf, "%d", &conn->hdrdgst_en); 3280 break; 3281 case ISCSI_PARAM_DATADGST_EN: 3282 sscanf(buf, "%d", &conn->datadgst_en); 3283 break; 3284 case ISCSI_PARAM_INITIAL_R2T_EN: 3285 sscanf(buf, "%d", &session->initial_r2t_en); 3286 break; 3287 case ISCSI_PARAM_MAX_R2T: 3288 sscanf(buf, "%hu", &session->max_r2t); 3289 break; 3290 case ISCSI_PARAM_IMM_DATA_EN: 3291 sscanf(buf, "%d", &session->imm_data_en); 3292 break; 3293 case ISCSI_PARAM_FIRST_BURST: 3294 sscanf(buf, "%d", &session->first_burst); 3295 break; 3296 case ISCSI_PARAM_MAX_BURST: 3297 sscanf(buf, "%d", &session->max_burst); 3298 break; 3299 case ISCSI_PARAM_PDU_INORDER_EN: 3300 sscanf(buf, "%d", &session->pdu_inorder_en); 3301 break; 3302 case ISCSI_PARAM_DATASEQ_INORDER_EN: 3303 sscanf(buf, "%d", &session->dataseq_inorder_en); 3304 break; 3305 case ISCSI_PARAM_ERL: 3306 sscanf(buf, "%d", &session->erl); 3307 break; 3308 case ISCSI_PARAM_EXP_STATSN: 3309 sscanf(buf, "%u", &conn->exp_statsn); 3310 break; 3311 case ISCSI_PARAM_USERNAME: 3312 return iscsi_switch_str_param(&session->username, buf); 3313 case ISCSI_PARAM_USERNAME_IN: 3314 return iscsi_switch_str_param(&session->username_in, buf); 3315 case ISCSI_PARAM_PASSWORD: 3316 return iscsi_switch_str_param(&session->password, buf); 3317 case ISCSI_PARAM_PASSWORD_IN: 3318 return iscsi_switch_str_param(&session->password_in, buf); 3319 case ISCSI_PARAM_TARGET_NAME: 3320 return iscsi_switch_str_param(&session->targetname, buf); 3321 case ISCSI_PARAM_TARGET_ALIAS: 3322 return iscsi_switch_str_param(&session->targetalias, buf); 3323 case ISCSI_PARAM_TPGT: 3324 sscanf(buf, "%d", &session->tpgt); 3325 break; 3326 case ISCSI_PARAM_PERSISTENT_PORT: 3327 sscanf(buf, "%d", &conn->persistent_port); 3328 break; 3329 case ISCSI_PARAM_PERSISTENT_ADDRESS: 3330 return iscsi_switch_str_param(&conn->persistent_address, buf); 3331 case ISCSI_PARAM_IFACE_NAME: 3332 return iscsi_switch_str_param(&session->ifacename, buf); 3333 case ISCSI_PARAM_INITIATOR_NAME: 3334 return iscsi_switch_str_param(&session->initiatorname, buf); 3335 case ISCSI_PARAM_BOOT_ROOT: 3336 return iscsi_switch_str_param(&session->boot_root, buf); 3337 case ISCSI_PARAM_BOOT_NIC: 3338 return iscsi_switch_str_param(&session->boot_nic, buf); 3339 case ISCSI_PARAM_BOOT_TARGET: 3340 return iscsi_switch_str_param(&session->boot_target, buf); 3341 case ISCSI_PARAM_PORTAL_TYPE: 3342 return iscsi_switch_str_param(&session->portal_type, buf); 3343 case ISCSI_PARAM_DISCOVERY_PARENT_TYPE: 3344 return iscsi_switch_str_param(&session->discovery_parent_type, 3345 buf); 3346 case ISCSI_PARAM_DISCOVERY_SESS: 3347 sscanf(buf, "%d", &val); 3348 session->discovery_sess = !!val; 3349 break; 3350 case ISCSI_PARAM_LOCAL_IPADDR: 3351 return iscsi_switch_str_param(&conn->local_ipaddr, buf); 3352 default: 3353 return -ENOSYS; 3354 } 3355 3356 return 0; 3357 } 3358 EXPORT_SYMBOL_GPL(iscsi_set_param); 3359 3360 int iscsi_session_get_param(struct iscsi_cls_session *cls_session, 3361 enum iscsi_param param, char *buf) 3362 { 3363 struct iscsi_session *session = cls_session->dd_data; 3364 int len; 3365 3366 switch(param) { 3367 case ISCSI_PARAM_FAST_ABORT: 3368 len = sprintf(buf, "%d\n", session->fast_abort); 3369 break; 3370 case ISCSI_PARAM_ABORT_TMO: 3371 len = sprintf(buf, "%d\n", session->abort_timeout); 3372 break; 3373 case ISCSI_PARAM_LU_RESET_TMO: 3374 len = sprintf(buf, "%d\n", session->lu_reset_timeout); 3375 break; 3376 case ISCSI_PARAM_TGT_RESET_TMO: 3377 len = sprintf(buf, "%d\n", session->tgt_reset_timeout); 3378 break; 3379 case ISCSI_PARAM_INITIAL_R2T_EN: 3380 len = sprintf(buf, "%d\n", session->initial_r2t_en); 3381 break; 3382 case ISCSI_PARAM_MAX_R2T: 3383 len = sprintf(buf, "%hu\n", session->max_r2t); 3384 break; 3385 case ISCSI_PARAM_IMM_DATA_EN: 3386 len = sprintf(buf, "%d\n", session->imm_data_en); 3387 break; 3388 case ISCSI_PARAM_FIRST_BURST: 3389 len = sprintf(buf, "%u\n", session->first_burst); 3390 break; 3391 case ISCSI_PARAM_MAX_BURST: 3392 len = sprintf(buf, "%u\n", session->max_burst); 3393 break; 3394 case ISCSI_PARAM_PDU_INORDER_EN: 3395 len = sprintf(buf, "%d\n", session->pdu_inorder_en); 3396 break; 3397 case ISCSI_PARAM_DATASEQ_INORDER_EN: 3398 len = sprintf(buf, "%d\n", session->dataseq_inorder_en); 3399 break; 3400 case ISCSI_PARAM_DEF_TASKMGMT_TMO: 3401 len = sprintf(buf, "%d\n", session->def_taskmgmt_tmo); 3402 break; 3403 case ISCSI_PARAM_ERL: 3404 len = sprintf(buf, "%d\n", session->erl); 3405 break; 3406 case ISCSI_PARAM_TARGET_NAME: 3407 len = sprintf(buf, "%s\n", session->targetname); 3408 break; 3409 case ISCSI_PARAM_TARGET_ALIAS: 3410 len = sprintf(buf, "%s\n", session->targetalias); 3411 break; 3412 case ISCSI_PARAM_TPGT: 3413 len = sprintf(buf, "%d\n", session->tpgt); 3414 break; 3415 case ISCSI_PARAM_USERNAME: 3416 len = sprintf(buf, "%s\n", session->username); 3417 break; 3418 case ISCSI_PARAM_USERNAME_IN: 3419 len = sprintf(buf, "%s\n", session->username_in); 3420 break; 3421 case ISCSI_PARAM_PASSWORD: 3422 len = sprintf(buf, "%s\n", session->password); 3423 break; 3424 case ISCSI_PARAM_PASSWORD_IN: 3425 len = sprintf(buf, "%s\n", session->password_in); 3426 break; 3427 case ISCSI_PARAM_IFACE_NAME: 3428 len = sprintf(buf, "%s\n", session->ifacename); 3429 break; 3430 case ISCSI_PARAM_INITIATOR_NAME: 3431 len = sprintf(buf, "%s\n", session->initiatorname); 3432 break; 3433 case ISCSI_PARAM_BOOT_ROOT: 3434 len = sprintf(buf, "%s\n", session->boot_root); 3435 break; 3436 case ISCSI_PARAM_BOOT_NIC: 3437 len = sprintf(buf, "%s\n", session->boot_nic); 3438 break; 3439 case ISCSI_PARAM_BOOT_TARGET: 3440 len = sprintf(buf, "%s\n", session->boot_target); 3441 break; 3442 case ISCSI_PARAM_AUTO_SND_TGT_DISABLE: 3443 len = sprintf(buf, "%u\n", session->auto_snd_tgt_disable); 3444 break; 3445 case ISCSI_PARAM_DISCOVERY_SESS: 3446 len = sprintf(buf, "%u\n", session->discovery_sess); 3447 break; 3448 case ISCSI_PARAM_PORTAL_TYPE: 3449 len = sprintf(buf, "%s\n", session->portal_type); 3450 break; 3451 case ISCSI_PARAM_CHAP_AUTH_EN: 3452 len = sprintf(buf, "%u\n", session->chap_auth_en); 3453 break; 3454 case ISCSI_PARAM_DISCOVERY_LOGOUT_EN: 3455 len = sprintf(buf, "%u\n", session->discovery_logout_en); 3456 break; 3457 case ISCSI_PARAM_BIDI_CHAP_EN: 3458 len = sprintf(buf, "%u\n", session->bidi_chap_en); 3459 break; 3460 case ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL: 3461 len = sprintf(buf, "%u\n", session->discovery_auth_optional); 3462 break; 3463 case ISCSI_PARAM_DEF_TIME2WAIT: 3464 len = sprintf(buf, "%d\n", session->time2wait); 3465 break; 3466 case ISCSI_PARAM_DEF_TIME2RETAIN: 3467 len = sprintf(buf, "%d\n", session->time2retain); 3468 break; 3469 case ISCSI_PARAM_TSID: 3470 len = sprintf(buf, "%u\n", session->tsid); 3471 break; 3472 case ISCSI_PARAM_ISID: 3473 len = sprintf(buf, "%02x%02x%02x%02x%02x%02x\n", 3474 session->isid[0], session->isid[1], 3475 session->isid[2], session->isid[3], 3476 session->isid[4], session->isid[5]); 3477 break; 3478 case ISCSI_PARAM_DISCOVERY_PARENT_IDX: 3479 len = sprintf(buf, "%u\n", session->discovery_parent_idx); 3480 break; 3481 case ISCSI_PARAM_DISCOVERY_PARENT_TYPE: 3482 if (session->discovery_parent_type) 3483 len = sprintf(buf, "%s\n", 3484 session->discovery_parent_type); 3485 else 3486 len = sprintf(buf, "\n"); 3487 break; 3488 default: 3489 return -ENOSYS; 3490 } 3491 3492 return len; 3493 } 3494 EXPORT_SYMBOL_GPL(iscsi_session_get_param); 3495 3496 int iscsi_conn_get_addr_param(struct sockaddr_storage *addr, 3497 enum iscsi_param param, char *buf) 3498 { 3499 struct sockaddr_in6 *sin6 = NULL; 3500 struct sockaddr_in *sin = NULL; 3501 int len; 3502 3503 switch (addr->ss_family) { 3504 case AF_INET: 3505 sin = (struct sockaddr_in *)addr; 3506 break; 3507 case AF_INET6: 3508 sin6 = (struct sockaddr_in6 *)addr; 3509 break; 3510 default: 3511 return -EINVAL; 3512 } 3513 3514 switch (param) { 3515 case ISCSI_PARAM_CONN_ADDRESS: 3516 case ISCSI_HOST_PARAM_IPADDRESS: 3517 if (sin) 3518 len = sprintf(buf, "%pI4\n", &sin->sin_addr.s_addr); 3519 else 3520 len = sprintf(buf, "%pI6\n", &sin6->sin6_addr); 3521 break; 3522 case ISCSI_PARAM_CONN_PORT: 3523 case ISCSI_PARAM_LOCAL_PORT: 3524 if (sin) 3525 len = sprintf(buf, "%hu\n", be16_to_cpu(sin->sin_port)); 3526 else 3527 len = sprintf(buf, "%hu\n", 3528 be16_to_cpu(sin6->sin6_port)); 3529 break; 3530 default: 3531 return -EINVAL; 3532 } 3533 3534 return len; 3535 } 3536 EXPORT_SYMBOL_GPL(iscsi_conn_get_addr_param); 3537 3538 int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, 3539 enum iscsi_param param, char *buf) 3540 { 3541 struct iscsi_conn *conn = cls_conn->dd_data; 3542 int len; 3543 3544 switch(param) { 3545 case ISCSI_PARAM_PING_TMO: 3546 len = sprintf(buf, "%u\n", conn->ping_timeout); 3547 break; 3548 case ISCSI_PARAM_RECV_TMO: 3549 len = sprintf(buf, "%u\n", conn->recv_timeout); 3550 break; 3551 case ISCSI_PARAM_MAX_RECV_DLENGTH: 3552 len = sprintf(buf, "%u\n", conn->max_recv_dlength); 3553 break; 3554 case ISCSI_PARAM_MAX_XMIT_DLENGTH: 3555 len = sprintf(buf, "%u\n", conn->max_xmit_dlength); 3556 break; 3557 case ISCSI_PARAM_HDRDGST_EN: 3558 len = sprintf(buf, "%d\n", conn->hdrdgst_en); 3559 break; 3560 case ISCSI_PARAM_DATADGST_EN: 3561 len = sprintf(buf, "%d\n", conn->datadgst_en); 3562 break; 3563 case ISCSI_PARAM_IFMARKER_EN: 3564 len = sprintf(buf, "%d\n", conn->ifmarker_en); 3565 break; 3566 case ISCSI_PARAM_OFMARKER_EN: 3567 len = sprintf(buf, "%d\n", conn->ofmarker_en); 3568 break; 3569 case ISCSI_PARAM_EXP_STATSN: 3570 len = sprintf(buf, "%u\n", conn->exp_statsn); 3571 break; 3572 case ISCSI_PARAM_PERSISTENT_PORT: 3573 len = sprintf(buf, "%d\n", conn->persistent_port); 3574 break; 3575 case ISCSI_PARAM_PERSISTENT_ADDRESS: 3576 len = sprintf(buf, "%s\n", conn->persistent_address); 3577 break; 3578 case ISCSI_PARAM_STATSN: 3579 len = sprintf(buf, "%u\n", conn->statsn); 3580 break; 3581 case ISCSI_PARAM_MAX_SEGMENT_SIZE: 3582 len = sprintf(buf, "%u\n", conn->max_segment_size); 3583 break; 3584 case ISCSI_PARAM_KEEPALIVE_TMO: 3585 len = sprintf(buf, "%u\n", conn->keepalive_tmo); 3586 break; 3587 case ISCSI_PARAM_LOCAL_PORT: 3588 len = sprintf(buf, "%u\n", conn->local_port); 3589 break; 3590 case ISCSI_PARAM_TCP_TIMESTAMP_STAT: 3591 len = sprintf(buf, "%u\n", conn->tcp_timestamp_stat); 3592 break; 3593 case ISCSI_PARAM_TCP_NAGLE_DISABLE: 3594 len = sprintf(buf, "%u\n", conn->tcp_nagle_disable); 3595 break; 3596 case ISCSI_PARAM_TCP_WSF_DISABLE: 3597 len = sprintf(buf, "%u\n", conn->tcp_wsf_disable); 3598 break; 3599 case ISCSI_PARAM_TCP_TIMER_SCALE: 3600 len = sprintf(buf, "%u\n", conn->tcp_timer_scale); 3601 break; 3602 case ISCSI_PARAM_TCP_TIMESTAMP_EN: 3603 len = sprintf(buf, "%u\n", conn->tcp_timestamp_en); 3604 break; 3605 case ISCSI_PARAM_IP_FRAGMENT_DISABLE: 3606 len = sprintf(buf, "%u\n", conn->fragment_disable); 3607 break; 3608 case ISCSI_PARAM_IPV4_TOS: 3609 len = sprintf(buf, "%u\n", conn->ipv4_tos); 3610 break; 3611 case ISCSI_PARAM_IPV6_TC: 3612 len = sprintf(buf, "%u\n", conn->ipv6_traffic_class); 3613 break; 3614 case ISCSI_PARAM_IPV6_FLOW_LABEL: 3615 len = sprintf(buf, "%u\n", conn->ipv6_flow_label); 3616 break; 3617 case ISCSI_PARAM_IS_FW_ASSIGNED_IPV6: 3618 len = sprintf(buf, "%u\n", conn->is_fw_assigned_ipv6); 3619 break; 3620 case ISCSI_PARAM_TCP_XMIT_WSF: 3621 len = sprintf(buf, "%u\n", conn->tcp_xmit_wsf); 3622 break; 3623 case ISCSI_PARAM_TCP_RECV_WSF: 3624 len = sprintf(buf, "%u\n", conn->tcp_recv_wsf); 3625 break; 3626 case ISCSI_PARAM_LOCAL_IPADDR: 3627 len = sprintf(buf, "%s\n", conn->local_ipaddr); 3628 break; 3629 default: 3630 return -ENOSYS; 3631 } 3632 3633 return len; 3634 } 3635 EXPORT_SYMBOL_GPL(iscsi_conn_get_param); 3636 3637 int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param, 3638 char *buf) 3639 { 3640 struct iscsi_host *ihost = shost_priv(shost); 3641 int len; 3642 3643 switch (param) { 3644 case ISCSI_HOST_PARAM_NETDEV_NAME: 3645 len = sprintf(buf, "%s\n", ihost->netdev); 3646 break; 3647 case ISCSI_HOST_PARAM_HWADDRESS: 3648 len = sprintf(buf, "%s\n", ihost->hwaddress); 3649 break; 3650 case ISCSI_HOST_PARAM_INITIATOR_NAME: 3651 len = sprintf(buf, "%s\n", ihost->initiatorname); 3652 break; 3653 default: 3654 return -ENOSYS; 3655 } 3656 3657 return len; 3658 } 3659 EXPORT_SYMBOL_GPL(iscsi_host_get_param); 3660 3661 int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param, 3662 char *buf, int buflen) 3663 { 3664 struct iscsi_host *ihost = shost_priv(shost); 3665 3666 switch (param) { 3667 case ISCSI_HOST_PARAM_NETDEV_NAME: 3668 return iscsi_switch_str_param(&ihost->netdev, buf); 3669 case ISCSI_HOST_PARAM_HWADDRESS: 3670 return iscsi_switch_str_param(&ihost->hwaddress, buf); 3671 case ISCSI_HOST_PARAM_INITIATOR_NAME: 3672 return iscsi_switch_str_param(&ihost->initiatorname, buf); 3673 default: 3674 return -ENOSYS; 3675 } 3676 3677 return 0; 3678 } 3679 EXPORT_SYMBOL_GPL(iscsi_host_set_param); 3680 3681 MODULE_AUTHOR("Mike Christie"); 3682 MODULE_DESCRIPTION("iSCSI library functions"); 3683 MODULE_LICENSE("GPL"); 3684