1/* 2 * iSCSI lib functions 3 * 4 * Copyright (C) 2006 Red Hat, Inc. All rights reserved. 5 * Copyright (C) 2004 - 2006 Mike Christie 6 * Copyright (C) 2004 - 2005 Dmitry Yusupov 7 * Copyright (C) 2004 - 2005 Alex Aizman 8 * maintained by open-iscsi@googlegroups.com 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; if not, write to the Free Software 22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 23 */ 24#include <linux/types.h> 25#include <linux/kfifo.h> 26#include <linux/delay.h> 27#include <linux/log2.h> 28#include <linux/slab.h> 29#include <linux/module.h> 30#include <asm/unaligned.h> 31#include <net/tcp.h> 32#include <scsi/scsi_cmnd.h> 33#include <scsi/scsi_device.h> 34#include <scsi/scsi_eh.h> 35#include <scsi/scsi_tcq.h> 36#include <scsi/scsi_host.h> 37#include <scsi/scsi.h> 38#include <scsi/iscsi_proto.h> 39#include <scsi/scsi_transport.h> 40#include <scsi/scsi_transport_iscsi.h> 41#include <scsi/libiscsi.h> 42 43static int iscsi_dbg_lib_conn; 44module_param_named(debug_libiscsi_conn, iscsi_dbg_lib_conn, int, 45 S_IRUGO | S_IWUSR); 46MODULE_PARM_DESC(debug_libiscsi_conn, 47 "Turn on debugging for connections in libiscsi module. " 48 "Set to 1 to turn on, and zero to turn off. Default is off."); 49 50static int iscsi_dbg_lib_session; 51module_param_named(debug_libiscsi_session, iscsi_dbg_lib_session, int, 52 S_IRUGO | S_IWUSR); 53MODULE_PARM_DESC(debug_libiscsi_session, 54 "Turn on debugging for sessions in libiscsi module. " 55 "Set to 1 to turn on, and zero to turn off. Default is off."); 56 57static int iscsi_dbg_lib_eh; 58module_param_named(debug_libiscsi_eh, iscsi_dbg_lib_eh, int, 59 S_IRUGO | S_IWUSR); 60MODULE_PARM_DESC(debug_libiscsi_eh, 61 "Turn on debugging for error handling in libiscsi module. " 62 "Set to 1 to turn on, and zero to turn off. Default is off."); 63 64#define ISCSI_DBG_CONN(_conn, dbg_fmt, arg...) \ 65 do { \ 66 if (iscsi_dbg_lib_conn) \ 67 iscsi_conn_printk(KERN_INFO, _conn, \ 68 "%s " dbg_fmt, \ 69 __func__, ##arg); \ 70 } while (0); 71 72#define ISCSI_DBG_SESSION(_session, dbg_fmt, arg...) \ 73 do { \ 74 if (iscsi_dbg_lib_session) \ 75 iscsi_session_printk(KERN_INFO, _session, \ 76 "%s " dbg_fmt, \ 77 __func__, ##arg); \ 78 } while (0); 79 80#define ISCSI_DBG_EH(_session, dbg_fmt, arg...) \ 81 do { \ 82 if (iscsi_dbg_lib_eh) \ 83 iscsi_session_printk(KERN_INFO, _session, \ 84 "%s " dbg_fmt, \ 85 __func__, ##arg); \ 86 } while (0); 87 88inline void iscsi_conn_queue_work(struct iscsi_conn *conn) 89{ 90 struct Scsi_Host *shost = conn->session->host; 91 struct iscsi_host *ihost = shost_priv(shost); 92 93 if (ihost->workq) 94 queue_work(ihost->workq, &conn->xmitwork); 95} 96EXPORT_SYMBOL_GPL(iscsi_conn_queue_work); 97 98static void __iscsi_update_cmdsn(struct iscsi_session *session, 99 uint32_t exp_cmdsn, uint32_t max_cmdsn) 100{ 101 /* 102 * standard specifies this check for when to update expected and 103 * max sequence numbers 104 */ 105 if (iscsi_sna_lt(max_cmdsn, exp_cmdsn - 1)) 106 return; 107 108 if (exp_cmdsn != session->exp_cmdsn && 109 !iscsi_sna_lt(exp_cmdsn, session->exp_cmdsn)) 110 session->exp_cmdsn = exp_cmdsn; 111 112 if (max_cmdsn != session->max_cmdsn && 113 !iscsi_sna_lt(max_cmdsn, session->max_cmdsn)) 114 session->max_cmdsn = max_cmdsn; 115} 116 117void iscsi_update_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr) 118{ 119 __iscsi_update_cmdsn(session, be32_to_cpu(hdr->exp_cmdsn), 120 be32_to_cpu(hdr->max_cmdsn)); 121} 122EXPORT_SYMBOL_GPL(iscsi_update_cmdsn); 123 124/** 125 * iscsi_prep_data_out_pdu - initialize Data-Out 126 * @task: scsi command task 127 * @r2t: R2T info 128 * @hdr: iscsi data in pdu 129 * 130 * Notes: 131 * Initialize Data-Out within this R2T sequence and finds 132 * proper data_offset within this SCSI command. 133 * 134 * This function is called with connection lock taken. 135 **/ 136void iscsi_prep_data_out_pdu(struct iscsi_task *task, struct iscsi_r2t_info *r2t, 137 struct iscsi_data *hdr) 138{ 139 struct iscsi_conn *conn = task->conn; 140 unsigned int left = r2t->data_length - r2t->sent; 141 142 task->hdr_len = sizeof(struct iscsi_data); 143 144 memset(hdr, 0, sizeof(struct iscsi_data)); 145 hdr->ttt = r2t->ttt; 146 hdr->datasn = cpu_to_be32(r2t->datasn); 147 r2t->datasn++; 148 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; 149 hdr->lun = task->lun; 150 hdr->itt = task->hdr_itt; 151 hdr->exp_statsn = r2t->exp_statsn; 152 hdr->offset = cpu_to_be32(r2t->data_offset + r2t->sent); 153 if (left > conn->max_xmit_dlength) { 154 hton24(hdr->dlength, conn->max_xmit_dlength); 155 r2t->data_count = conn->max_xmit_dlength; 156 hdr->flags = 0; 157 } else { 158 hton24(hdr->dlength, left); 159 r2t->data_count = left; 160 hdr->flags = ISCSI_FLAG_CMD_FINAL; 161 } 162 conn->dataout_pdus_cnt++; 163} 164EXPORT_SYMBOL_GPL(iscsi_prep_data_out_pdu); 165 166static int iscsi_add_hdr(struct iscsi_task *task, unsigned len) 167{ 168 unsigned exp_len = task->hdr_len + len; 169 170 if (exp_len > task->hdr_max) { 171 WARN_ON(1); 172 return -EINVAL; 173 } 174 175 WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */ 176 task->hdr_len = exp_len; 177 return 0; 178} 179 180/* 181 * make an extended cdb AHS 182 */ 183static int iscsi_prep_ecdb_ahs(struct iscsi_task *task) 184{ 185 struct scsi_cmnd *cmd = task->sc; 186 unsigned rlen, pad_len; 187 unsigned short ahslength; 188 struct iscsi_ecdb_ahdr *ecdb_ahdr; 189 int rc; 190 191 ecdb_ahdr = iscsi_next_hdr(task); 192 rlen = cmd->cmd_len - ISCSI_CDB_SIZE; 193 194 BUG_ON(rlen > sizeof(ecdb_ahdr->ecdb)); 195 ahslength = rlen + sizeof(ecdb_ahdr->reserved); 196 197 pad_len = iscsi_padding(rlen); 198 199 rc = iscsi_add_hdr(task, sizeof(ecdb_ahdr->ahslength) + 200 sizeof(ecdb_ahdr->ahstype) + ahslength + pad_len); 201 if (rc) 202 return rc; 203 204 if (pad_len) 205 memset(&ecdb_ahdr->ecdb[rlen], 0, pad_len); 206 207 ecdb_ahdr->ahslength = cpu_to_be16(ahslength); 208 ecdb_ahdr->ahstype = ISCSI_AHSTYPE_CDB; 209 ecdb_ahdr->reserved = 0; 210 memcpy(ecdb_ahdr->ecdb, cmd->cmnd + ISCSI_CDB_SIZE, rlen); 211 212 ISCSI_DBG_SESSION(task->conn->session, 213 "iscsi_prep_ecdb_ahs: varlen_cdb_len %d " 214 "rlen %d pad_len %d ahs_length %d iscsi_headers_size " 215 "%u\n", cmd->cmd_len, rlen, pad_len, ahslength, 216 task->hdr_len); 217 return 0; 218} 219 220static int iscsi_prep_bidi_ahs(struct iscsi_task *task) 221{ 222 struct scsi_cmnd *sc = task->sc; 223 struct iscsi_rlength_ahdr *rlen_ahdr; 224 int rc; 225 226 rlen_ahdr = iscsi_next_hdr(task); 227 rc = iscsi_add_hdr(task, sizeof(*rlen_ahdr)); 228 if (rc) 229 return rc; 230 231 rlen_ahdr->ahslength = 232 cpu_to_be16(sizeof(rlen_ahdr->read_length) + 233 sizeof(rlen_ahdr->reserved)); 234 rlen_ahdr->ahstype = ISCSI_AHSTYPE_RLENGTH; 235 rlen_ahdr->reserved = 0; 236 rlen_ahdr->read_length = cpu_to_be32(scsi_in(sc)->length); 237 238 ISCSI_DBG_SESSION(task->conn->session, 239 "bidi-in rlen_ahdr->read_length(%d) " 240 "rlen_ahdr->ahslength(%d)\n", 241 be32_to_cpu(rlen_ahdr->read_length), 242 be16_to_cpu(rlen_ahdr->ahslength)); 243 return 0; 244} 245 246/** 247 * iscsi_check_tmf_restrictions - check if a task is affected by TMF 248 * @task: iscsi task 249 * @opcode: opcode to check for 250 * 251 * During TMF a task has to be checked if it's affected. 252 * All unrelated I/O can be passed through, but I/O to the 253 * affected LUN should be restricted. 254 * If 'fast_abort' is set we won't be sending any I/O to the 255 * affected LUN. 256 * Otherwise the target is waiting for all TTTs to be completed, 257 * so we have to send all outstanding Data-Out PDUs to the target. 258 */ 259static int iscsi_check_tmf_restrictions(struct iscsi_task *task, int opcode) 260{ 261 struct iscsi_conn *conn = task->conn; 262 struct iscsi_tm *tmf = &conn->tmhdr; 263 u64 hdr_lun; 264 265 if (conn->tmf_state == TMF_INITIAL) 266 return 0; 267 268 if ((tmf->opcode & ISCSI_OPCODE_MASK) != ISCSI_OP_SCSI_TMFUNC) 269 return 0; 270 271 switch (ISCSI_TM_FUNC_VALUE(tmf)) { 272 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 273 /* 274 * Allow PDUs for unrelated LUNs 275 */ 276 hdr_lun = scsilun_to_int(&tmf->lun); 277 if (hdr_lun != task->sc->device->lun) 278 return 0; 279 /* fall through */ 280 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 281 /* 282 * Fail all SCSI cmd PDUs 283 */ 284 if (opcode != ISCSI_OP_SCSI_DATA_OUT) { 285 iscsi_conn_printk(KERN_INFO, conn, 286 "task [op %x/%x itt " 287 "0x%x/0x%x] " 288 "rejected.\n", 289 task->hdr->opcode, opcode, 290 task->itt, task->hdr_itt); 291 return -EACCES; 292 } 293 /* 294 * And also all data-out PDUs in response to R2T 295 * if fast_abort is set. 296 */ 297 if (conn->session->fast_abort) { 298 iscsi_conn_printk(KERN_INFO, conn, 299 "task [op %x/%x itt " 300 "0x%x/0x%x] fast abort.\n", 301 task->hdr->opcode, opcode, 302 task->itt, task->hdr_itt); 303 return -EACCES; 304 } 305 break; 306 case ISCSI_TM_FUNC_ABORT_TASK: 307 /* 308 * the caller has already checked if the task 309 * they want to abort was in the pending queue so if 310 * we are here the cmd pdu has gone out already, and 311 * we will only hit this for data-outs 312 */ 313 if (opcode == ISCSI_OP_SCSI_DATA_OUT && 314 task->hdr_itt == tmf->rtt) { 315 ISCSI_DBG_SESSION(conn->session, 316 "Preventing task %x/%x from sending " 317 "data-out due to abort task in " 318 "progress\n", task->itt, 319 task->hdr_itt); 320 return -EACCES; 321 } 322 break; 323 } 324 325 return 0; 326} 327 328/** 329 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu 330 * @task: iscsi task 331 * 332 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set 333 * fields like dlength or final based on how much data it sends 334 */ 335static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task) 336{ 337 struct iscsi_conn *conn = task->conn; 338 struct iscsi_session *session = conn->session; 339 struct scsi_cmnd *sc = task->sc; 340 struct iscsi_scsi_req *hdr; 341 unsigned hdrlength, cmd_len, transfer_length; 342 itt_t itt; 343 int rc; 344 345 rc = iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_CMD); 346 if (rc) 347 return rc; 348 349 if (conn->session->tt->alloc_pdu) { 350 rc = conn->session->tt->alloc_pdu(task, ISCSI_OP_SCSI_CMD); 351 if (rc) 352 return rc; 353 } 354 hdr = (struct iscsi_scsi_req *)task->hdr; 355 itt = hdr->itt; 356 memset(hdr, 0, sizeof(*hdr)); 357 358 if (session->tt->parse_pdu_itt) 359 hdr->itt = task->hdr_itt = itt; 360 else 361 hdr->itt = task->hdr_itt = build_itt(task->itt, 362 task->conn->session->age); 363 task->hdr_len = 0; 364 rc = iscsi_add_hdr(task, sizeof(*hdr)); 365 if (rc) 366 return rc; 367 hdr->opcode = ISCSI_OP_SCSI_CMD; 368 hdr->flags = ISCSI_ATTR_SIMPLE; 369 int_to_scsilun(sc->device->lun, &hdr->lun); 370 task->lun = hdr->lun; 371 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); 372 cmd_len = sc->cmd_len; 373 if (cmd_len < ISCSI_CDB_SIZE) 374 memset(&hdr->cdb[cmd_len], 0, ISCSI_CDB_SIZE - cmd_len); 375 else if (cmd_len > ISCSI_CDB_SIZE) { 376 rc = iscsi_prep_ecdb_ahs(task); 377 if (rc) 378 return rc; 379 cmd_len = ISCSI_CDB_SIZE; 380 } 381 memcpy(hdr->cdb, sc->cmnd, cmd_len); 382 383 task->imm_count = 0; 384 if (scsi_bidi_cmnd(sc)) { 385 hdr->flags |= ISCSI_FLAG_CMD_READ; 386 rc = iscsi_prep_bidi_ahs(task); 387 if (rc) 388 return rc; 389 } 390 391 if (scsi_get_prot_op(sc) != SCSI_PROT_NORMAL) 392 task->protected = true; 393 394 transfer_length = scsi_transfer_length(sc); 395 hdr->data_length = cpu_to_be32(transfer_length); 396 if (sc->sc_data_direction == DMA_TO_DEVICE) { 397 struct iscsi_r2t_info *r2t = &task->unsol_r2t; 398 399 hdr->flags |= ISCSI_FLAG_CMD_WRITE; 400 /* 401 * Write counters: 402 * 403 * imm_count bytes to be sent right after 404 * SCSI PDU Header 405 * 406 * unsol_count bytes(as Data-Out) to be sent 407 * without R2T ack right after 408 * immediate data 409 * 410 * r2t data_length bytes to be sent via R2T ack's 411 * 412 * pad_count bytes to be sent as zero-padding 413 */ 414 memset(r2t, 0, sizeof(*r2t)); 415 416 if (session->imm_data_en) { 417 if (transfer_length >= session->first_burst) 418 task->imm_count = min(session->first_burst, 419 conn->max_xmit_dlength); 420 else 421 task->imm_count = min(transfer_length, 422 conn->max_xmit_dlength); 423 hton24(hdr->dlength, task->imm_count); 424 } else 425 zero_data(hdr->dlength); 426 427 if (!session->initial_r2t_en) { 428 r2t->data_length = min(session->first_burst, 429 transfer_length) - 430 task->imm_count; 431 r2t->data_offset = task->imm_count; 432 r2t->ttt = cpu_to_be32(ISCSI_RESERVED_TAG); 433 r2t->exp_statsn = cpu_to_be32(conn->exp_statsn); 434 } 435 436 if (!task->unsol_r2t.data_length) 437 /* No unsolicit Data-Out's */ 438 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 439 } else { 440 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 441 zero_data(hdr->dlength); 442 443 if (sc->sc_data_direction == DMA_FROM_DEVICE) 444 hdr->flags |= ISCSI_FLAG_CMD_READ; 445 } 446 447 /* calculate size of additional header segments (AHSs) */ 448 hdrlength = task->hdr_len - sizeof(*hdr); 449 450 WARN_ON(hdrlength & (ISCSI_PAD_LEN-1)); 451 hdrlength /= ISCSI_PAD_LEN; 452 453 WARN_ON(hdrlength >= 256); 454 hdr->hlength = hdrlength & 0xFF; 455 hdr->cmdsn = task->cmdsn = cpu_to_be32(session->cmdsn); 456 457 if (session->tt->init_task && session->tt->init_task(task)) 458 return -EIO; 459 460 task->state = ISCSI_TASK_RUNNING; 461 session->cmdsn++; 462 463 conn->scsicmd_pdus_cnt++; 464 ISCSI_DBG_SESSION(session, "iscsi prep [%s cid %d sc %p cdb 0x%x " 465 "itt 0x%x len %d bidi_len %d cmdsn %d win %d]\n", 466 scsi_bidi_cmnd(sc) ? "bidirectional" : 467 sc->sc_data_direction == DMA_TO_DEVICE ? 468 "write" : "read", conn->id, sc, sc->cmnd[0], 469 task->itt, transfer_length, 470 scsi_bidi_cmnd(sc) ? scsi_in(sc)->length : 0, 471 session->cmdsn, 472 session->max_cmdsn - session->exp_cmdsn + 1); 473 return 0; 474} 475 476/** 477 * iscsi_free_task - free a task 478 * @task: iscsi cmd task 479 * 480 * Must be called with session back_lock. 481 * This function returns the scsi command to scsi-ml or cleans 482 * up mgmt tasks then returns the task to the pool. 483 */ 484static void iscsi_free_task(struct iscsi_task *task) 485{ 486 struct iscsi_conn *conn = task->conn; 487 struct iscsi_session *session = conn->session; 488 struct scsi_cmnd *sc = task->sc; 489 int oldstate = task->state; 490 491 ISCSI_DBG_SESSION(session, "freeing task itt 0x%x state %d sc %p\n", 492 task->itt, task->state, task->sc); 493 494 session->tt->cleanup_task(task); 495 task->state = ISCSI_TASK_FREE; 496 task->sc = NULL; 497 /* 498 * login task is preallocated so do not free 499 */ 500 if (conn->login_task == task) 501 return; 502 503 kfifo_in(&session->cmdpool.queue, (void*)&task, sizeof(void*)); 504 505 if (sc) { 506 /* SCSI eh reuses commands to verify us */ 507 sc->SCp.ptr = NULL; 508 /* 509 * queue command may call this to free the task, so 510 * it will decide how to return sc to scsi-ml. 511 */ 512 if (oldstate != ISCSI_TASK_REQUEUE_SCSIQ) 513 sc->scsi_done(sc); 514 } 515} 516 517void __iscsi_get_task(struct iscsi_task *task) 518{ 519 atomic_inc(&task->refcount); 520} 521EXPORT_SYMBOL_GPL(__iscsi_get_task); 522 523void __iscsi_put_task(struct iscsi_task *task) 524{ 525 if (atomic_dec_and_test(&task->refcount)) 526 iscsi_free_task(task); 527} 528EXPORT_SYMBOL_GPL(__iscsi_put_task); 529 530void iscsi_put_task(struct iscsi_task *task) 531{ 532 struct iscsi_session *session = task->conn->session; 533 534 /* regular RX path uses back_lock */ 535 spin_lock_bh(&session->back_lock); 536 __iscsi_put_task(task); 537 spin_unlock_bh(&session->back_lock); 538} 539EXPORT_SYMBOL_GPL(iscsi_put_task); 540 541/** 542 * iscsi_complete_task - finish a task 543 * @task: iscsi cmd task 544 * @state: state to complete task with 545 * 546 * Must be called with session back_lock. 547 */ 548static void iscsi_complete_task(struct iscsi_task *task, int state) 549{ 550 struct iscsi_conn *conn = task->conn; 551 552 ISCSI_DBG_SESSION(conn->session, 553 "complete task itt 0x%x state %d sc %p\n", 554 task->itt, task->state, task->sc); 555 if (task->state == ISCSI_TASK_COMPLETED || 556 task->state == ISCSI_TASK_ABRT_TMF || 557 task->state == ISCSI_TASK_ABRT_SESS_RECOV || 558 task->state == ISCSI_TASK_REQUEUE_SCSIQ) 559 return; 560 WARN_ON_ONCE(task->state == ISCSI_TASK_FREE); 561 task->state = state; 562 563 if (!list_empty(&task->running)) 564 list_del_init(&task->running); 565 566 if (conn->task == task) 567 conn->task = NULL; 568 569 if (conn->ping_task == task) 570 conn->ping_task = NULL; 571 572 /* release get from queueing */ 573 __iscsi_put_task(task); 574} 575 576/** 577 * iscsi_complete_scsi_task - finish scsi task normally 578 * @task: iscsi task for scsi cmd 579 * @exp_cmdsn: expected cmd sn in cpu format 580 * @max_cmdsn: max cmd sn in cpu format 581 * 582 * This is used when drivers do not need or cannot perform 583 * lower level pdu processing. 584 * 585 * Called with session back_lock 586 */ 587void iscsi_complete_scsi_task(struct iscsi_task *task, 588 uint32_t exp_cmdsn, uint32_t max_cmdsn) 589{ 590 struct iscsi_conn *conn = task->conn; 591 592 ISCSI_DBG_SESSION(conn->session, "[itt 0x%x]\n", task->itt); 593 594 conn->last_recv = jiffies; 595 __iscsi_update_cmdsn(conn->session, exp_cmdsn, max_cmdsn); 596 iscsi_complete_task(task, ISCSI_TASK_COMPLETED); 597} 598EXPORT_SYMBOL_GPL(iscsi_complete_scsi_task); 599 600 601/* 602 * session back_lock must be held and if not called for a task that is 603 * still pending or from the xmit thread, then xmit thread must 604 * be suspended. 605 */ 606static void fail_scsi_task(struct iscsi_task *task, int err) 607{ 608 struct iscsi_conn *conn = task->conn; 609 struct scsi_cmnd *sc; 610 int state; 611 612 /* 613 * if a command completes and we get a successful tmf response 614 * we will hit this because the scsi eh abort code does not take 615 * a ref to the task. 616 */ 617 sc = task->sc; 618 if (!sc) 619 return; 620 621 if (task->state == ISCSI_TASK_PENDING) { 622 /* 623 * cmd never made it to the xmit thread, so we should not count 624 * the cmd in the sequencing 625 */ 626 conn->session->queued_cmdsn--; 627 /* it was never sent so just complete like normal */ 628 state = ISCSI_TASK_COMPLETED; 629 } else if (err == DID_TRANSPORT_DISRUPTED) 630 state = ISCSI_TASK_ABRT_SESS_RECOV; 631 else 632 state = ISCSI_TASK_ABRT_TMF; 633 634 sc->result = err << 16; 635 if (!scsi_bidi_cmnd(sc)) 636 scsi_set_resid(sc, scsi_bufflen(sc)); 637 else { 638 scsi_out(sc)->resid = scsi_out(sc)->length; 639 scsi_in(sc)->resid = scsi_in(sc)->length; 640 } 641 642 /* regular RX path uses back_lock */ 643 spin_lock_bh(&conn->session->back_lock); 644 iscsi_complete_task(task, state); 645 spin_unlock_bh(&conn->session->back_lock); 646} 647 648static int iscsi_prep_mgmt_task(struct iscsi_conn *conn, 649 struct iscsi_task *task) 650{ 651 struct iscsi_session *session = conn->session; 652 struct iscsi_hdr *hdr = task->hdr; 653 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr; 654 uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK; 655 656 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) 657 return -ENOTCONN; 658 659 if (opcode != ISCSI_OP_LOGIN && opcode != ISCSI_OP_TEXT) 660 nop->exp_statsn = cpu_to_be32(conn->exp_statsn); 661 /* 662 * pre-format CmdSN for outgoing PDU. 663 */ 664 nop->cmdsn = cpu_to_be32(session->cmdsn); 665 if (hdr->itt != RESERVED_ITT) { 666 /* 667 * TODO: We always use immediate for normal session pdus. 668 * If we start to send tmfs or nops as non-immediate then 669 * we should start checking the cmdsn numbers for mgmt tasks. 670 * 671 * During discovery sessions iscsid sends TEXT as non immediate, 672 * but we always only send one PDU at a time. 673 */ 674 if (conn->c_stage == ISCSI_CONN_STARTED && 675 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) { 676 session->queued_cmdsn++; 677 session->cmdsn++; 678 } 679 } 680 681 if (session->tt->init_task && session->tt->init_task(task)) 682 return -EIO; 683 684 if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT) 685 session->state = ISCSI_STATE_LOGGING_OUT; 686 687 task->state = ISCSI_TASK_RUNNING; 688 ISCSI_DBG_SESSION(session, "mgmtpdu [op 0x%x hdr->itt 0x%x " 689 "datalen %d]\n", hdr->opcode & ISCSI_OPCODE_MASK, 690 hdr->itt, task->data_count); 691 return 0; 692} 693 694static struct iscsi_task * 695__iscsi_conn_send_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 696 char *data, uint32_t data_size) 697{ 698 struct iscsi_session *session = conn->session; 699 struct iscsi_host *ihost = shost_priv(session->host); 700 uint8_t opcode = hdr->opcode & ISCSI_OPCODE_MASK; 701 struct iscsi_task *task; 702 itt_t itt; 703 704 if (session->state == ISCSI_STATE_TERMINATE) 705 return NULL; 706 707 if (opcode == ISCSI_OP_LOGIN || opcode == ISCSI_OP_TEXT) { 708 /* 709 * Login and Text are sent serially, in 710 * request-followed-by-response sequence. 711 * Same task can be used. Same ITT must be used. 712 * Note that login_task is preallocated at conn_create(). 713 */ 714 if (conn->login_task->state != ISCSI_TASK_FREE) { 715 iscsi_conn_printk(KERN_ERR, conn, "Login/Text in " 716 "progress. Cannot start new task.\n"); 717 return NULL; 718 } 719 720 if (data_size > ISCSI_DEF_MAX_RECV_SEG_LEN) { 721 iscsi_conn_printk(KERN_ERR, conn, "Invalid buffer len of %u for login task. Max len is %u\n", data_size, ISCSI_DEF_MAX_RECV_SEG_LEN); 722 return NULL; 723 } 724 725 task = conn->login_task; 726 } else { 727 if (session->state != ISCSI_STATE_LOGGED_IN) 728 return NULL; 729 730 if (data_size != 0) { 731 iscsi_conn_printk(KERN_ERR, conn, "Can not send data buffer of len %u for op 0x%x\n", data_size, opcode); 732 return NULL; 733 } 734 735 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE); 736 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED); 737 738 if (!kfifo_out(&session->cmdpool.queue, 739 (void*)&task, sizeof(void*))) 740 return NULL; 741 } 742 /* 743 * released in complete pdu for task we expect a response for, and 744 * released by the lld when it has transmitted the task for 745 * pdus we do not expect a response for. 746 */ 747 atomic_set(&task->refcount, 1); 748 task->conn = conn; 749 task->sc = NULL; 750 INIT_LIST_HEAD(&task->running); 751 task->state = ISCSI_TASK_PENDING; 752 753 if (data_size) { 754 memcpy(task->data, data, data_size); 755 task->data_count = data_size; 756 } else 757 task->data_count = 0; 758 759 if (conn->session->tt->alloc_pdu) { 760 if (conn->session->tt->alloc_pdu(task, hdr->opcode)) { 761 iscsi_conn_printk(KERN_ERR, conn, "Could not allocate " 762 "pdu for mgmt task.\n"); 763 goto free_task; 764 } 765 } 766 767 itt = task->hdr->itt; 768 task->hdr_len = sizeof(struct iscsi_hdr); 769 memcpy(task->hdr, hdr, sizeof(struct iscsi_hdr)); 770 771 if (hdr->itt != RESERVED_ITT) { 772 if (session->tt->parse_pdu_itt) 773 task->hdr->itt = itt; 774 else 775 task->hdr->itt = build_itt(task->itt, 776 task->conn->session->age); 777 } 778 779 if (!ihost->workq) { 780 if (iscsi_prep_mgmt_task(conn, task)) 781 goto free_task; 782 783 if (session->tt->xmit_task(task)) 784 goto free_task; 785 } else { 786 list_add_tail(&task->running, &conn->mgmtqueue); 787 iscsi_conn_queue_work(conn); 788 } 789 790 return task; 791 792free_task: 793 /* regular RX path uses back_lock */ 794 spin_lock_bh(&session->back_lock); 795 __iscsi_put_task(task); 796 spin_unlock_bh(&session->back_lock); 797 return NULL; 798} 799 800int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr, 801 char *data, uint32_t data_size) 802{ 803 struct iscsi_conn *conn = cls_conn->dd_data; 804 struct iscsi_session *session = conn->session; 805 int err = 0; 806 807 spin_lock_bh(&session->frwd_lock); 808 if (!__iscsi_conn_send_pdu(conn, hdr, data, data_size)) 809 err = -EPERM; 810 spin_unlock_bh(&session->frwd_lock); 811 return err; 812} 813EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu); 814 815/** 816 * iscsi_cmd_rsp - SCSI Command Response processing 817 * @conn: iscsi connection 818 * @hdr: iscsi header 819 * @task: scsi command task 820 * @data: cmd data buffer 821 * @datalen: len of buffer 822 * 823 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and 824 * then completes the command and task. 825 **/ 826static void iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 827 struct iscsi_task *task, char *data, 828 int datalen) 829{ 830 struct iscsi_scsi_rsp *rhdr = (struct iscsi_scsi_rsp *)hdr; 831 struct iscsi_session *session = conn->session; 832 struct scsi_cmnd *sc = task->sc; 833 834 iscsi_update_cmdsn(session, (struct iscsi_nopin*)rhdr); 835 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; 836 837 sc->result = (DID_OK << 16) | rhdr->cmd_status; 838 839 if (task->protected) { 840 sector_t sector; 841 u8 ascq; 842 843 /** 844 * Transports that didn't implement check_protection 845 * callback but still published T10-PI support to scsi-mid 846 * deserve this BUG_ON. 847 **/ 848 BUG_ON(!session->tt->check_protection); 849 850 ascq = session->tt->check_protection(task, §or); 851 if (ascq) { 852 sc->result = DRIVER_SENSE << 24 | 853 SAM_STAT_CHECK_CONDITION; 854 scsi_build_sense_buffer(1, sc->sense_buffer, 855 ILLEGAL_REQUEST, 0x10, ascq); 856 sc->sense_buffer[7] = 0xc; /* Additional sense length */ 857 sc->sense_buffer[8] = 0; /* Information desc type */ 858 sc->sense_buffer[9] = 0xa; /* Additional desc length */ 859 sc->sense_buffer[10] = 0x80; /* Validity bit */ 860 861 put_unaligned_be64(sector, &sc->sense_buffer[12]); 862 goto out; 863 } 864 } 865 866 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) { 867 sc->result = DID_ERROR << 16; 868 goto out; 869 } 870 871 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) { 872 uint16_t senselen; 873 874 if (datalen < 2) { 875invalid_datalen: 876 iscsi_conn_printk(KERN_ERR, conn, 877 "Got CHECK_CONDITION but invalid data " 878 "buffer size of %d\n", datalen); 879 sc->result = DID_BAD_TARGET << 16; 880 goto out; 881 } 882 883 senselen = get_unaligned_be16(data); 884 if (datalen < senselen) 885 goto invalid_datalen; 886 887 memcpy(sc->sense_buffer, data + 2, 888 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); 889 ISCSI_DBG_SESSION(session, "copied %d bytes of sense\n", 890 min_t(uint16_t, senselen, 891 SCSI_SENSE_BUFFERSIZE)); 892 } 893 894 if (rhdr->flags & (ISCSI_FLAG_CMD_BIDI_UNDERFLOW | 895 ISCSI_FLAG_CMD_BIDI_OVERFLOW)) { 896 int res_count = be32_to_cpu(rhdr->bi_residual_count); 897 898 if (scsi_bidi_cmnd(sc) && res_count > 0 && 899 (rhdr->flags & ISCSI_FLAG_CMD_BIDI_OVERFLOW || 900 res_count <= scsi_in(sc)->length)) 901 scsi_in(sc)->resid = res_count; 902 else 903 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; 904 } 905 906 if (rhdr->flags & (ISCSI_FLAG_CMD_UNDERFLOW | 907 ISCSI_FLAG_CMD_OVERFLOW)) { 908 int res_count = be32_to_cpu(rhdr->residual_count); 909 910 if (res_count > 0 && 911 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || 912 res_count <= scsi_bufflen(sc))) 913 /* write side for bidi or uni-io set_resid */ 914 scsi_set_resid(sc, res_count); 915 else 916 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; 917 } 918out: 919 ISCSI_DBG_SESSION(session, "cmd rsp done [sc %p res %d itt 0x%x]\n", 920 sc, sc->result, task->itt); 921 conn->scsirsp_pdus_cnt++; 922 iscsi_complete_task(task, ISCSI_TASK_COMPLETED); 923} 924 925/** 926 * iscsi_data_in_rsp - SCSI Data-In Response processing 927 * @conn: iscsi connection 928 * @hdr: iscsi pdu 929 * @task: scsi command task 930 **/ 931static void 932iscsi_data_in_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 933 struct iscsi_task *task) 934{ 935 struct iscsi_data_rsp *rhdr = (struct iscsi_data_rsp *)hdr; 936 struct scsi_cmnd *sc = task->sc; 937 938 if (!(rhdr->flags & ISCSI_FLAG_DATA_STATUS)) 939 return; 940 941 iscsi_update_cmdsn(conn->session, (struct iscsi_nopin *)hdr); 942 sc->result = (DID_OK << 16) | rhdr->cmd_status; 943 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; 944 if (rhdr->flags & (ISCSI_FLAG_DATA_UNDERFLOW | 945 ISCSI_FLAG_DATA_OVERFLOW)) { 946 int res_count = be32_to_cpu(rhdr->residual_count); 947 948 if (res_count > 0 && 949 (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW || 950 res_count <= scsi_in(sc)->length)) 951 scsi_in(sc)->resid = res_count; 952 else 953 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; 954 } 955 956 ISCSI_DBG_SESSION(conn->session, "data in with status done " 957 "[sc %p res %d itt 0x%x]\n", 958 sc, sc->result, task->itt); 959 conn->scsirsp_pdus_cnt++; 960 iscsi_complete_task(task, ISCSI_TASK_COMPLETED); 961} 962 963static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr) 964{ 965 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr; 966 967 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; 968 conn->tmfrsp_pdus_cnt++; 969 970 if (conn->tmf_state != TMF_QUEUED) 971 return; 972 973 if (tmf->response == ISCSI_TMF_RSP_COMPLETE) 974 conn->tmf_state = TMF_SUCCESS; 975 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK) 976 conn->tmf_state = TMF_NOT_FOUND; 977 else 978 conn->tmf_state = TMF_FAILED; 979 wake_up(&conn->ehwait); 980} 981 982static void iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr) 983{ 984 struct iscsi_nopout hdr; 985 struct iscsi_task *task; 986 987 if (!rhdr && conn->ping_task) 988 return; 989 990 memset(&hdr, 0, sizeof(struct iscsi_nopout)); 991 hdr.opcode = ISCSI_OP_NOOP_OUT | ISCSI_OP_IMMEDIATE; 992 hdr.flags = ISCSI_FLAG_CMD_FINAL; 993 994 if (rhdr) { 995 hdr.lun = rhdr->lun; 996 hdr.ttt = rhdr->ttt; 997 hdr.itt = RESERVED_ITT; 998 } else 999 hdr.ttt = RESERVED_ITT; 1000 1001 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)&hdr, NULL, 0); 1002 if (!task) 1003 iscsi_conn_printk(KERN_ERR, conn, "Could not send nopout\n"); 1004 else if (!rhdr) { 1005 /* only track our nops */ 1006 conn->ping_task = task; 1007 conn->last_ping = jiffies; 1008 } 1009} 1010 1011static int iscsi_nop_out_rsp(struct iscsi_task *task, 1012 struct iscsi_nopin *nop, char *data, int datalen) 1013{ 1014 struct iscsi_conn *conn = task->conn; 1015 int rc = 0; 1016 1017 if (conn->ping_task != task) { 1018 /* 1019 * If this is not in response to one of our 1020 * nops then it must be from userspace. 1021 */ 1022 if (iscsi_recv_pdu(conn->cls_conn, (struct iscsi_hdr *)nop, 1023 data, datalen)) 1024 rc = ISCSI_ERR_CONN_FAILED; 1025 } else 1026 mod_timer(&conn->transport_timer, jiffies + conn->recv_timeout); 1027 iscsi_complete_task(task, ISCSI_TASK_COMPLETED); 1028 return rc; 1029} 1030 1031static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 1032 char *data, int datalen) 1033{ 1034 struct iscsi_reject *reject = (struct iscsi_reject *)hdr; 1035 struct iscsi_hdr rejected_pdu; 1036 int opcode, rc = 0; 1037 1038 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1; 1039 1040 if (ntoh24(reject->dlength) > datalen || 1041 ntoh24(reject->dlength) < sizeof(struct iscsi_hdr)) { 1042 iscsi_conn_printk(KERN_ERR, conn, "Cannot handle rejected " 1043 "pdu. Invalid data length (pdu dlength " 1044 "%u, datalen %d\n", ntoh24(reject->dlength), 1045 datalen); 1046 return ISCSI_ERR_PROTO; 1047 } 1048 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr)); 1049 opcode = rejected_pdu.opcode & ISCSI_OPCODE_MASK; 1050 1051 switch (reject->reason) { 1052 case ISCSI_REASON_DATA_DIGEST_ERROR: 1053 iscsi_conn_printk(KERN_ERR, conn, 1054 "pdu (op 0x%x itt 0x%x) rejected " 1055 "due to DataDigest error.\n", 1056 opcode, rejected_pdu.itt); 1057 break; 1058 case ISCSI_REASON_IMM_CMD_REJECT: 1059 iscsi_conn_printk(KERN_ERR, conn, 1060 "pdu (op 0x%x itt 0x%x) rejected. Too many " 1061 "immediate commands.\n", 1062 opcode, rejected_pdu.itt); 1063 /* 1064 * We only send one TMF at a time so if the target could not 1065 * handle it, then it should get fixed (RFC mandates that 1066 * a target can handle one immediate TMF per conn). 1067 * 1068 * For nops-outs, we could have sent more than one if 1069 * the target is sending us lots of nop-ins 1070 */ 1071 if (opcode != ISCSI_OP_NOOP_OUT) 1072 return 0; 1073 1074 if (rejected_pdu.itt == cpu_to_be32(ISCSI_RESERVED_TAG)) { 1075 /* 1076 * nop-out in response to target's nop-out rejected. 1077 * Just resend. 1078 */ 1079 /* In RX path we are under back lock */ 1080 spin_unlock(&conn->session->back_lock); 1081 spin_lock(&conn->session->frwd_lock); 1082 iscsi_send_nopout(conn, 1083 (struct iscsi_nopin*)&rejected_pdu); 1084 spin_unlock(&conn->session->frwd_lock); 1085 spin_lock(&conn->session->back_lock); 1086 } else { 1087 struct iscsi_task *task; 1088 /* 1089 * Our nop as ping got dropped. We know the target 1090 * and transport are ok so just clean up 1091 */ 1092 task = iscsi_itt_to_task(conn, rejected_pdu.itt); 1093 if (!task) { 1094 iscsi_conn_printk(KERN_ERR, conn, 1095 "Invalid pdu reject. Could " 1096 "not lookup rejected task.\n"); 1097 rc = ISCSI_ERR_BAD_ITT; 1098 } else 1099 rc = iscsi_nop_out_rsp(task, 1100 (struct iscsi_nopin*)&rejected_pdu, 1101 NULL, 0); 1102 } 1103 break; 1104 default: 1105 iscsi_conn_printk(KERN_ERR, conn, 1106 "pdu (op 0x%x itt 0x%x) rejected. Reason " 1107 "code 0x%x\n", rejected_pdu.opcode, 1108 rejected_pdu.itt, reject->reason); 1109 break; 1110 } 1111 return rc; 1112} 1113 1114/** 1115 * iscsi_itt_to_task - look up task by itt 1116 * @conn: iscsi connection 1117 * @itt: itt 1118 * 1119 * This should be used for mgmt tasks like login and nops, or if 1120 * the LDD's itt space does not include the session age. 1121 * 1122 * The session back_lock must be held. 1123 */ 1124struct iscsi_task *iscsi_itt_to_task(struct iscsi_conn *conn, itt_t itt) 1125{ 1126 struct iscsi_session *session = conn->session; 1127 int i; 1128 1129 if (itt == RESERVED_ITT) 1130 return NULL; 1131 1132 if (session->tt->parse_pdu_itt) 1133 session->tt->parse_pdu_itt(conn, itt, &i, NULL); 1134 else 1135 i = get_itt(itt); 1136 if (i >= session->cmds_max) 1137 return NULL; 1138 1139 return session->cmds[i]; 1140} 1141EXPORT_SYMBOL_GPL(iscsi_itt_to_task); 1142 1143/** 1144 * __iscsi_complete_pdu - complete pdu 1145 * @conn: iscsi conn 1146 * @hdr: iscsi header 1147 * @data: data buffer 1148 * @datalen: len of data buffer 1149 * 1150 * Completes pdu processing by freeing any resources allocated at 1151 * queuecommand or send generic. session back_lock must be held and verify 1152 * itt must have been called. 1153 */ 1154int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 1155 char *data, int datalen) 1156{ 1157 struct iscsi_session *session = conn->session; 1158 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0; 1159 struct iscsi_task *task; 1160 uint32_t itt; 1161 1162 conn->last_recv = jiffies; 1163 rc = iscsi_verify_itt(conn, hdr->itt); 1164 if (rc) 1165 return rc; 1166 1167 if (hdr->itt != RESERVED_ITT) 1168 itt = get_itt(hdr->itt); 1169 else 1170 itt = ~0U; 1171 1172 ISCSI_DBG_SESSION(session, "[op 0x%x cid %d itt 0x%x len %d]\n", 1173 opcode, conn->id, itt, datalen); 1174 1175 if (itt == ~0U) { 1176 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); 1177 1178 switch(opcode) { 1179 case ISCSI_OP_NOOP_IN: 1180 if (datalen) { 1181 rc = ISCSI_ERR_PROTO; 1182 break; 1183 } 1184 1185 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG)) 1186 break; 1187 1188 /* In RX path we are under back lock */ 1189 spin_unlock(&session->back_lock); 1190 spin_lock(&session->frwd_lock); 1191 iscsi_send_nopout(conn, (struct iscsi_nopin*)hdr); 1192 spin_unlock(&session->frwd_lock); 1193 spin_lock(&session->back_lock); 1194 break; 1195 case ISCSI_OP_REJECT: 1196 rc = iscsi_handle_reject(conn, hdr, data, datalen); 1197 break; 1198 case ISCSI_OP_ASYNC_EVENT: 1199 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; 1200 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) 1201 rc = ISCSI_ERR_CONN_FAILED; 1202 break; 1203 default: 1204 rc = ISCSI_ERR_BAD_OPCODE; 1205 break; 1206 } 1207 goto out; 1208 } 1209 1210 switch(opcode) { 1211 case ISCSI_OP_SCSI_CMD_RSP: 1212 case ISCSI_OP_SCSI_DATA_IN: 1213 task = iscsi_itt_to_ctask(conn, hdr->itt); 1214 if (!task) 1215 return ISCSI_ERR_BAD_ITT; 1216 task->last_xfer = jiffies; 1217 break; 1218 case ISCSI_OP_R2T: 1219 /* 1220 * LLD handles R2Ts if they need to. 1221 */ 1222 return 0; 1223 case ISCSI_OP_LOGOUT_RSP: 1224 case ISCSI_OP_LOGIN_RSP: 1225 case ISCSI_OP_TEXT_RSP: 1226 case ISCSI_OP_SCSI_TMFUNC_RSP: 1227 case ISCSI_OP_NOOP_IN: 1228 task = iscsi_itt_to_task(conn, hdr->itt); 1229 if (!task) 1230 return ISCSI_ERR_BAD_ITT; 1231 break; 1232 default: 1233 return ISCSI_ERR_BAD_OPCODE; 1234 } 1235 1236 switch(opcode) { 1237 case ISCSI_OP_SCSI_CMD_RSP: 1238 iscsi_scsi_cmd_rsp(conn, hdr, task, data, datalen); 1239 break; 1240 case ISCSI_OP_SCSI_DATA_IN: 1241 iscsi_data_in_rsp(conn, hdr, task); 1242 break; 1243 case ISCSI_OP_LOGOUT_RSP: 1244 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); 1245 if (datalen) { 1246 rc = ISCSI_ERR_PROTO; 1247 break; 1248 } 1249 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; 1250 goto recv_pdu; 1251 case ISCSI_OP_LOGIN_RSP: 1252 case ISCSI_OP_TEXT_RSP: 1253 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); 1254 /* 1255 * login related PDU's exp_statsn is handled in 1256 * userspace 1257 */ 1258 goto recv_pdu; 1259 case ISCSI_OP_SCSI_TMFUNC_RSP: 1260 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); 1261 if (datalen) { 1262 rc = ISCSI_ERR_PROTO; 1263 break; 1264 } 1265 1266 iscsi_tmf_rsp(conn, hdr); 1267 iscsi_complete_task(task, ISCSI_TASK_COMPLETED); 1268 break; 1269 case ISCSI_OP_NOOP_IN: 1270 iscsi_update_cmdsn(session, (struct iscsi_nopin*)hdr); 1271 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) { 1272 rc = ISCSI_ERR_PROTO; 1273 break; 1274 } 1275 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; 1276 1277 rc = iscsi_nop_out_rsp(task, (struct iscsi_nopin*)hdr, 1278 data, datalen); 1279 break; 1280 default: 1281 rc = ISCSI_ERR_BAD_OPCODE; 1282 break; 1283 } 1284 1285out: 1286 return rc; 1287recv_pdu: 1288 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) 1289 rc = ISCSI_ERR_CONN_FAILED; 1290 iscsi_complete_task(task, ISCSI_TASK_COMPLETED); 1291 return rc; 1292} 1293EXPORT_SYMBOL_GPL(__iscsi_complete_pdu); 1294 1295int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 1296 char *data, int datalen) 1297{ 1298 int rc; 1299 1300 spin_lock(&conn->session->back_lock); 1301 rc = __iscsi_complete_pdu(conn, hdr, data, datalen); 1302 spin_unlock(&conn->session->back_lock); 1303 return rc; 1304} 1305EXPORT_SYMBOL_GPL(iscsi_complete_pdu); 1306 1307int iscsi_verify_itt(struct iscsi_conn *conn, itt_t itt) 1308{ 1309 struct iscsi_session *session = conn->session; 1310 int age = 0, i = 0; 1311 1312 if (itt == RESERVED_ITT) 1313 return 0; 1314 1315 if (session->tt->parse_pdu_itt) 1316 session->tt->parse_pdu_itt(conn, itt, &i, &age); 1317 else { 1318 i = get_itt(itt); 1319 age = ((__force u32)itt >> ISCSI_AGE_SHIFT) & ISCSI_AGE_MASK; 1320 } 1321 1322 if (age != session->age) { 1323 iscsi_conn_printk(KERN_ERR, conn, 1324 "received itt %x expected session age (%x)\n", 1325 (__force u32)itt, session->age); 1326 return ISCSI_ERR_BAD_ITT; 1327 } 1328 1329 if (i >= session->cmds_max) { 1330 iscsi_conn_printk(KERN_ERR, conn, 1331 "received invalid itt index %u (max cmds " 1332 "%u.\n", i, session->cmds_max); 1333 return ISCSI_ERR_BAD_ITT; 1334 } 1335 return 0; 1336} 1337EXPORT_SYMBOL_GPL(iscsi_verify_itt); 1338 1339/** 1340 * iscsi_itt_to_ctask - look up ctask by itt 1341 * @conn: iscsi connection 1342 * @itt: itt 1343 * 1344 * This should be used for cmd tasks. 1345 * 1346 * The session back_lock must be held. 1347 */ 1348struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *conn, itt_t itt) 1349{ 1350 struct iscsi_task *task; 1351 1352 if (iscsi_verify_itt(conn, itt)) 1353 return NULL; 1354 1355 task = iscsi_itt_to_task(conn, itt); 1356 if (!task || !task->sc) 1357 return NULL; 1358 1359 if (task->sc->SCp.phase != conn->session->age) { 1360 iscsi_session_printk(KERN_ERR, conn->session, 1361 "task's session age %d, expected %d\n", 1362 task->sc->SCp.phase, conn->session->age); 1363 return NULL; 1364 } 1365 1366 return task; 1367} 1368EXPORT_SYMBOL_GPL(iscsi_itt_to_ctask); 1369 1370void iscsi_session_failure(struct iscsi_session *session, 1371 enum iscsi_err err) 1372{ 1373 struct iscsi_conn *conn; 1374 struct device *dev; 1375 1376 spin_lock_bh(&session->frwd_lock); 1377 conn = session->leadconn; 1378 if (session->state == ISCSI_STATE_TERMINATE || !conn) { 1379 spin_unlock_bh(&session->frwd_lock); 1380 return; 1381 } 1382 1383 dev = get_device(&conn->cls_conn->dev); 1384 spin_unlock_bh(&session->frwd_lock); 1385 if (!dev) 1386 return; 1387 /* 1388 * if the host is being removed bypass the connection 1389 * recovery initialization because we are going to kill 1390 * the session. 1391 */ 1392 if (err == ISCSI_ERR_INVALID_HOST) 1393 iscsi_conn_error_event(conn->cls_conn, err); 1394 else 1395 iscsi_conn_failure(conn, err); 1396 put_device(dev); 1397} 1398EXPORT_SYMBOL_GPL(iscsi_session_failure); 1399 1400void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err) 1401{ 1402 struct iscsi_session *session = conn->session; 1403 1404 spin_lock_bh(&session->frwd_lock); 1405 if (session->state == ISCSI_STATE_FAILED) { 1406 spin_unlock_bh(&session->frwd_lock); 1407 return; 1408 } 1409 1410 if (conn->stop_stage == 0) 1411 session->state = ISCSI_STATE_FAILED; 1412 spin_unlock_bh(&session->frwd_lock); 1413 1414 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); 1415 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); 1416 iscsi_conn_error_event(conn->cls_conn, err); 1417} 1418EXPORT_SYMBOL_GPL(iscsi_conn_failure); 1419 1420static int iscsi_check_cmdsn_window_closed(struct iscsi_conn *conn) 1421{ 1422 struct iscsi_session *session = conn->session; 1423 1424 /* 1425 * Check for iSCSI window and take care of CmdSN wrap-around 1426 */ 1427 if (!iscsi_sna_lte(session->queued_cmdsn, session->max_cmdsn)) { 1428 ISCSI_DBG_SESSION(session, "iSCSI CmdSN closed. ExpCmdSn " 1429 "%u MaxCmdSN %u CmdSN %u/%u\n", 1430 session->exp_cmdsn, session->max_cmdsn, 1431 session->cmdsn, session->queued_cmdsn); 1432 return -ENOSPC; 1433 } 1434 return 0; 1435} 1436 1437static int iscsi_xmit_task(struct iscsi_conn *conn) 1438{ 1439 struct iscsi_task *task = conn->task; 1440 int rc; 1441 1442 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) 1443 return -ENODATA; 1444 1445 __iscsi_get_task(task); 1446 spin_unlock_bh(&conn->session->frwd_lock); 1447 rc = conn->session->tt->xmit_task(task); 1448 spin_lock_bh(&conn->session->frwd_lock); 1449 if (!rc) { 1450 /* done with this task */ 1451 task->last_xfer = jiffies; 1452 conn->task = NULL; 1453 } 1454 /* regular RX path uses back_lock */ 1455 spin_lock(&conn->session->back_lock); 1456 __iscsi_put_task(task); 1457 spin_unlock(&conn->session->back_lock); 1458 return rc; 1459} 1460 1461/** 1462 * iscsi_requeue_task - requeue task to run from session workqueue 1463 * @task: task to requeue 1464 * 1465 * LLDs that need to run a task from the session workqueue should call 1466 * this. The session frwd_lock must be held. This should only be called 1467 * by software drivers. 1468 */ 1469void iscsi_requeue_task(struct iscsi_task *task) 1470{ 1471 struct iscsi_conn *conn = task->conn; 1472 1473 /* 1474 * this may be on the requeue list already if the xmit_task callout 1475 * is handling the r2ts while we are adding new ones 1476 */ 1477 if (list_empty(&task->running)) 1478 list_add_tail(&task->running, &conn->requeue); 1479 iscsi_conn_queue_work(conn); 1480} 1481EXPORT_SYMBOL_GPL(iscsi_requeue_task); 1482 1483/** 1484 * iscsi_data_xmit - xmit any command into the scheduled connection 1485 * @conn: iscsi connection 1486 * 1487 * Notes: 1488 * The function can return -EAGAIN in which case the caller must 1489 * re-schedule it again later or recover. '0' return code means 1490 * successful xmit. 1491 **/ 1492static int iscsi_data_xmit(struct iscsi_conn *conn) 1493{ 1494 struct iscsi_task *task; 1495 int rc = 0; 1496 1497 spin_lock_bh(&conn->session->frwd_lock); 1498 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) { 1499 ISCSI_DBG_SESSION(conn->session, "Tx suspended!\n"); 1500 spin_unlock_bh(&conn->session->frwd_lock); 1501 return -ENODATA; 1502 } 1503 1504 if (conn->task) { 1505 rc = iscsi_xmit_task(conn); 1506 if (rc) 1507 goto done; 1508 } 1509 1510 /* 1511 * process mgmt pdus like nops before commands since we should 1512 * only have one nop-out as a ping from us and targets should not 1513 * overflow us with nop-ins 1514 */ 1515check_mgmt: 1516 while (!list_empty(&conn->mgmtqueue)) { 1517 conn->task = list_entry(conn->mgmtqueue.next, 1518 struct iscsi_task, running); 1519 list_del_init(&conn->task->running); 1520 if (iscsi_prep_mgmt_task(conn, conn->task)) { 1521 /* regular RX path uses back_lock */ 1522 spin_lock_bh(&conn->session->back_lock); 1523 __iscsi_put_task(conn->task); 1524 spin_unlock_bh(&conn->session->back_lock); 1525 conn->task = NULL; 1526 continue; 1527 } 1528 rc = iscsi_xmit_task(conn); 1529 if (rc) 1530 goto done; 1531 } 1532 1533 /* process pending command queue */ 1534 while (!list_empty(&conn->cmdqueue)) { 1535 conn->task = list_entry(conn->cmdqueue.next, struct iscsi_task, 1536 running); 1537 list_del_init(&conn->task->running); 1538 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) { 1539 fail_scsi_task(conn->task, DID_IMM_RETRY); 1540 continue; 1541 } 1542 rc = iscsi_prep_scsi_cmd_pdu(conn->task); 1543 if (rc) { 1544 if (rc == -ENOMEM || rc == -EACCES) { 1545 list_add_tail(&conn->task->running, 1546 &conn->cmdqueue); 1547 conn->task = NULL; 1548 goto done; 1549 } else 1550 fail_scsi_task(conn->task, DID_ABORT); 1551 continue; 1552 } 1553 rc = iscsi_xmit_task(conn); 1554 if (rc) 1555 goto done; 1556 /* 1557 * we could continuously get new task requests so 1558 * we need to check the mgmt queue for nops that need to 1559 * be sent to aviod starvation 1560 */ 1561 if (!list_empty(&conn->mgmtqueue)) 1562 goto check_mgmt; 1563 } 1564 1565 while (!list_empty(&conn->requeue)) { 1566 /* 1567 * we always do fastlogout - conn stop code will clean up. 1568 */ 1569 if (conn->session->state == ISCSI_STATE_LOGGING_OUT) 1570 break; 1571 1572 task = list_entry(conn->requeue.next, struct iscsi_task, 1573 running); 1574 if (iscsi_check_tmf_restrictions(task, ISCSI_OP_SCSI_DATA_OUT)) 1575 break; 1576 1577 conn->task = task; 1578 list_del_init(&conn->task->running); 1579 conn->task->state = ISCSI_TASK_RUNNING; 1580 rc = iscsi_xmit_task(conn); 1581 if (rc) 1582 goto done; 1583 if (!list_empty(&conn->mgmtqueue)) 1584 goto check_mgmt; 1585 } 1586 spin_unlock_bh(&conn->session->frwd_lock); 1587 return -ENODATA; 1588 1589done: 1590 spin_unlock_bh(&conn->session->frwd_lock); 1591 return rc; 1592} 1593 1594static void iscsi_xmitworker(struct work_struct *work) 1595{ 1596 struct iscsi_conn *conn = 1597 container_of(work, struct iscsi_conn, xmitwork); 1598 int rc; 1599 /* 1600 * serialize Xmit worker on a per-connection basis. 1601 */ 1602 do { 1603 rc = iscsi_data_xmit(conn); 1604 } while (rc >= 0 || rc == -EAGAIN); 1605} 1606 1607static inline struct iscsi_task *iscsi_alloc_task(struct iscsi_conn *conn, 1608 struct scsi_cmnd *sc) 1609{ 1610 struct iscsi_task *task; 1611 1612 if (!kfifo_out(&conn->session->cmdpool.queue, 1613 (void *) &task, sizeof(void *))) 1614 return NULL; 1615 1616 sc->SCp.phase = conn->session->age; 1617 sc->SCp.ptr = (char *) task; 1618 1619 atomic_set(&task->refcount, 1); 1620 task->state = ISCSI_TASK_PENDING; 1621 task->conn = conn; 1622 task->sc = sc; 1623 task->have_checked_conn = false; 1624 task->last_timeout = jiffies; 1625 task->last_xfer = jiffies; 1626 task->protected = false; 1627 INIT_LIST_HEAD(&task->running); 1628 return task; 1629} 1630 1631enum { 1632 FAILURE_BAD_HOST = 1, 1633 FAILURE_SESSION_FAILED, 1634 FAILURE_SESSION_FREED, 1635 FAILURE_WINDOW_CLOSED, 1636 FAILURE_OOM, 1637 FAILURE_SESSION_TERMINATE, 1638 FAILURE_SESSION_IN_RECOVERY, 1639 FAILURE_SESSION_RECOVERY_TIMEOUT, 1640 FAILURE_SESSION_LOGGING_OUT, 1641 FAILURE_SESSION_NOT_READY, 1642}; 1643 1644int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc) 1645{ 1646 struct iscsi_cls_session *cls_session; 1647 struct iscsi_host *ihost; 1648 int reason = 0; 1649 struct iscsi_session *session; 1650 struct iscsi_conn *conn; 1651 struct iscsi_task *task = NULL; 1652 1653 sc->result = 0; 1654 sc->SCp.ptr = NULL; 1655 1656 ihost = shost_priv(host); 1657 1658 cls_session = starget_to_session(scsi_target(sc->device)); 1659 session = cls_session->dd_data; 1660 spin_lock_bh(&session->frwd_lock); 1661 1662 reason = iscsi_session_chkready(cls_session); 1663 if (reason) { 1664 sc->result = reason; 1665 goto fault; 1666 } 1667 1668 if (session->state != ISCSI_STATE_LOGGED_IN) { 1669 /* 1670 * to handle the race between when we set the recovery state 1671 * and block the session we requeue here (commands could 1672 * be entering our queuecommand while a block is starting 1673 * up because the block code is not locked) 1674 */ 1675 switch (session->state) { 1676 case ISCSI_STATE_FAILED: 1677 case ISCSI_STATE_IN_RECOVERY: 1678 reason = FAILURE_SESSION_IN_RECOVERY; 1679 sc->result = DID_IMM_RETRY << 16; 1680 break; 1681 case ISCSI_STATE_LOGGING_OUT: 1682 reason = FAILURE_SESSION_LOGGING_OUT; 1683 sc->result = DID_IMM_RETRY << 16; 1684 break; 1685 case ISCSI_STATE_RECOVERY_FAILED: 1686 reason = FAILURE_SESSION_RECOVERY_TIMEOUT; 1687 sc->result = DID_TRANSPORT_FAILFAST << 16; 1688 break; 1689 case ISCSI_STATE_TERMINATE: 1690 reason = FAILURE_SESSION_TERMINATE; 1691 sc->result = DID_NO_CONNECT << 16; 1692 break; 1693 default: 1694 reason = FAILURE_SESSION_FREED; 1695 sc->result = DID_NO_CONNECT << 16; 1696 } 1697 goto fault; 1698 } 1699 1700 conn = session->leadconn; 1701 if (!conn) { 1702 reason = FAILURE_SESSION_FREED; 1703 sc->result = DID_NO_CONNECT << 16; 1704 goto fault; 1705 } 1706 1707 if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) { 1708 reason = FAILURE_SESSION_IN_RECOVERY; 1709 sc->result = DID_REQUEUE; 1710 goto fault; 1711 } 1712 1713 if (iscsi_check_cmdsn_window_closed(conn)) { 1714 reason = FAILURE_WINDOW_CLOSED; 1715 goto reject; 1716 } 1717 1718 task = iscsi_alloc_task(conn, sc); 1719 if (!task) { 1720 reason = FAILURE_OOM; 1721 goto reject; 1722 } 1723 1724 if (!ihost->workq) { 1725 reason = iscsi_prep_scsi_cmd_pdu(task); 1726 if (reason) { 1727 if (reason == -ENOMEM || reason == -EACCES) { 1728 reason = FAILURE_OOM; 1729 goto prepd_reject; 1730 } else { 1731 sc->result = DID_ABORT << 16; 1732 goto prepd_fault; 1733 } 1734 } 1735 if (session->tt->xmit_task(task)) { 1736 session->cmdsn--; 1737 reason = FAILURE_SESSION_NOT_READY; 1738 goto prepd_reject; 1739 } 1740 } else { 1741 list_add_tail(&task->running, &conn->cmdqueue); 1742 iscsi_conn_queue_work(conn); 1743 } 1744 1745 session->queued_cmdsn++; 1746 spin_unlock_bh(&session->frwd_lock); 1747 return 0; 1748 1749prepd_reject: 1750 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ); 1751reject: 1752 spin_unlock_bh(&session->frwd_lock); 1753 ISCSI_DBG_SESSION(session, "cmd 0x%x rejected (%d)\n", 1754 sc->cmnd[0], reason); 1755 return SCSI_MLQUEUE_TARGET_BUSY; 1756 1757prepd_fault: 1758 iscsi_complete_task(task, ISCSI_TASK_REQUEUE_SCSIQ); 1759fault: 1760 spin_unlock_bh(&session->frwd_lock); 1761 ISCSI_DBG_SESSION(session, "iscsi: cmd 0x%x is not queued (%d)\n", 1762 sc->cmnd[0], reason); 1763 if (!scsi_bidi_cmnd(sc)) 1764 scsi_set_resid(sc, scsi_bufflen(sc)); 1765 else { 1766 scsi_out(sc)->resid = scsi_out(sc)->length; 1767 scsi_in(sc)->resid = scsi_in(sc)->length; 1768 } 1769 sc->scsi_done(sc); 1770 return 0; 1771} 1772EXPORT_SYMBOL_GPL(iscsi_queuecommand); 1773 1774int iscsi_change_queue_depth(struct scsi_device *sdev, int depth, int reason) 1775{ 1776 switch (reason) { 1777 case SCSI_QDEPTH_DEFAULT: 1778 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); 1779 break; 1780 case SCSI_QDEPTH_QFULL: 1781 scsi_track_queue_full(sdev, depth); 1782 break; 1783 case SCSI_QDEPTH_RAMP_UP: 1784 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); 1785 break; 1786 default: 1787 return -EOPNOTSUPP; 1788 } 1789 return sdev->queue_depth; 1790} 1791EXPORT_SYMBOL_GPL(iscsi_change_queue_depth); 1792 1793int iscsi_target_alloc(struct scsi_target *starget) 1794{ 1795 struct iscsi_cls_session *cls_session = starget_to_session(starget); 1796 struct iscsi_session *session = cls_session->dd_data; 1797 1798 starget->can_queue = session->scsi_cmds_max; 1799 return 0; 1800} 1801EXPORT_SYMBOL_GPL(iscsi_target_alloc); 1802 1803static void iscsi_tmf_timedout(unsigned long data) 1804{ 1805 struct iscsi_conn *conn = (struct iscsi_conn *)data; 1806 struct iscsi_session *session = conn->session; 1807 1808 spin_lock(&session->frwd_lock); 1809 if (conn->tmf_state == TMF_QUEUED) { 1810 conn->tmf_state = TMF_TIMEDOUT; 1811 ISCSI_DBG_EH(session, "tmf timedout\n"); 1812 /* unblock eh_abort() */ 1813 wake_up(&conn->ehwait); 1814 } 1815 spin_unlock(&session->frwd_lock); 1816} 1817 1818static int iscsi_exec_task_mgmt_fn(struct iscsi_conn *conn, 1819 struct iscsi_tm *hdr, int age, 1820 int timeout) 1821{ 1822 struct iscsi_session *session = conn->session; 1823 struct iscsi_task *task; 1824 1825 task = __iscsi_conn_send_pdu(conn, (struct iscsi_hdr *)hdr, 1826 NULL, 0); 1827 if (!task) { 1828 spin_unlock_bh(&session->frwd_lock); 1829 iscsi_conn_printk(KERN_ERR, conn, "Could not send TMF.\n"); 1830 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); 1831 spin_lock_bh(&session->frwd_lock); 1832 return -EPERM; 1833 } 1834 conn->tmfcmd_pdus_cnt++; 1835 conn->tmf_timer.expires = timeout * HZ + jiffies; 1836 conn->tmf_timer.function = iscsi_tmf_timedout; 1837 conn->tmf_timer.data = (unsigned long)conn; 1838 add_timer(&conn->tmf_timer); 1839 ISCSI_DBG_EH(session, "tmf set timeout\n"); 1840 1841 spin_unlock_bh(&session->frwd_lock); 1842 mutex_unlock(&session->eh_mutex); 1843 1844 /* 1845 * block eh thread until: 1846 * 1847 * 1) tmf response 1848 * 2) tmf timeout 1849 * 3) session is terminated or restarted or userspace has 1850 * given up on recovery 1851 */ 1852 wait_event_interruptible(conn->ehwait, age != session->age || 1853 session->state != ISCSI_STATE_LOGGED_IN || 1854 conn->tmf_state != TMF_QUEUED); 1855 if (signal_pending(current)) 1856 flush_signals(current); 1857 del_timer_sync(&conn->tmf_timer); 1858 1859 mutex_lock(&session->eh_mutex); 1860 spin_lock_bh(&session->frwd_lock); 1861 /* if the session drops it will clean up the task */ 1862 if (age != session->age || 1863 session->state != ISCSI_STATE_LOGGED_IN) 1864 return -ENOTCONN; 1865 return 0; 1866} 1867 1868/* 1869 * Fail commands. session lock held and recv side suspended and xmit 1870 * thread flushed 1871 */ 1872static void fail_scsi_tasks(struct iscsi_conn *conn, u64 lun, int error) 1873{ 1874 struct iscsi_task *task; 1875 int i; 1876 1877 for (i = 0; i < conn->session->cmds_max; i++) { 1878 task = conn->session->cmds[i]; 1879 if (!task->sc || task->state == ISCSI_TASK_FREE) 1880 continue; 1881 1882 if (lun != -1 && lun != task->sc->device->lun) 1883 continue; 1884 1885 ISCSI_DBG_SESSION(conn->session, 1886 "failing sc %p itt 0x%x state %d\n", 1887 task->sc, task->itt, task->state); 1888 fail_scsi_task(task, error); 1889 } 1890} 1891 1892/** 1893 * iscsi_suspend_queue - suspend iscsi_queuecommand 1894 * @conn: iscsi conn to stop queueing IO on 1895 * 1896 * This grabs the session frwd_lock to make sure no one is in 1897 * xmit_task/queuecommand, and then sets suspend to prevent 1898 * new commands from being queued. This only needs to be called 1899 * by offload drivers that need to sync a path like ep disconnect 1900 * with the iscsi_queuecommand/xmit_task. To start IO again libiscsi 1901 * will call iscsi_start_tx and iscsi_unblock_session when in FFP. 1902 */ 1903void iscsi_suspend_queue(struct iscsi_conn *conn) 1904{ 1905 spin_lock_bh(&conn->session->frwd_lock); 1906 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); 1907 spin_unlock_bh(&conn->session->frwd_lock); 1908} 1909EXPORT_SYMBOL_GPL(iscsi_suspend_queue); 1910 1911/** 1912 * iscsi_suspend_tx - suspend iscsi_data_xmit 1913 * @conn: iscsi conn tp stop processing IO on. 1914 * 1915 * This function sets the suspend bit to prevent iscsi_data_xmit 1916 * from sending new IO, and if work is queued on the xmit thread 1917 * it will wait for it to be completed. 1918 */ 1919void iscsi_suspend_tx(struct iscsi_conn *conn) 1920{ 1921 struct Scsi_Host *shost = conn->session->host; 1922 struct iscsi_host *ihost = shost_priv(shost); 1923 1924 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); 1925 if (ihost->workq) 1926 flush_workqueue(ihost->workq); 1927} 1928EXPORT_SYMBOL_GPL(iscsi_suspend_tx); 1929 1930static void iscsi_start_tx(struct iscsi_conn *conn) 1931{ 1932 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); 1933 iscsi_conn_queue_work(conn); 1934} 1935 1936/* 1937 * We want to make sure a ping is in flight. It has timed out. 1938 * And we are not busy processing a pdu that is making 1939 * progress but got started before the ping and is taking a while 1940 * to complete so the ping is just stuck behind it in a queue. 1941 */ 1942static int iscsi_has_ping_timed_out(struct iscsi_conn *conn) 1943{ 1944 if (conn->ping_task && 1945 time_before_eq(conn->last_recv + (conn->recv_timeout * HZ) + 1946 (conn->ping_timeout * HZ), jiffies)) 1947 return 1; 1948 else 1949 return 0; 1950} 1951 1952static enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc) 1953{ 1954 enum blk_eh_timer_return rc = BLK_EH_NOT_HANDLED; 1955 struct iscsi_task *task = NULL, *running_task; 1956 struct iscsi_cls_session *cls_session; 1957 struct iscsi_session *session; 1958 struct iscsi_conn *conn; 1959 int i; 1960 1961 cls_session = starget_to_session(scsi_target(sc->device)); 1962 session = cls_session->dd_data; 1963 1964 ISCSI_DBG_EH(session, "scsi cmd %p timedout\n", sc); 1965 1966 spin_lock(&session->frwd_lock); 1967 task = (struct iscsi_task *)sc->SCp.ptr; 1968 if (!task) { 1969 /* 1970 * Raced with completion. Blk layer has taken ownership 1971 * so let timeout code complete it now. 1972 */ 1973 rc = BLK_EH_HANDLED; 1974 goto done; 1975 } 1976 1977 if (session->state != ISCSI_STATE_LOGGED_IN) { 1978 /* 1979 * We are probably in the middle of iscsi recovery so let 1980 * that complete and handle the error. 1981 */ 1982 rc = BLK_EH_RESET_TIMER; 1983 goto done; 1984 } 1985 1986 conn = session->leadconn; 1987 if (!conn) { 1988 /* In the middle of shuting down */ 1989 rc = BLK_EH_RESET_TIMER; 1990 goto done; 1991 } 1992 1993 /* 1994 * If we have sent (at least queued to the network layer) a pdu or 1995 * recvd one for the task since the last timeout ask for 1996 * more time. If on the next timeout we have not made progress 1997 * we can check if it is the task or connection when we send the 1998 * nop as a ping. 1999 */ 2000 if (time_after(task->last_xfer, task->last_timeout)) { 2001 ISCSI_DBG_EH(session, "Command making progress. Asking " 2002 "scsi-ml for more time to complete. " 2003 "Last data xfer at %lu. Last timeout was at " 2004 "%lu\n.", task->last_xfer, task->last_timeout); 2005 task->have_checked_conn = false; 2006 rc = BLK_EH_RESET_TIMER; 2007 goto done; 2008 } 2009 2010 if (!conn->recv_timeout && !conn->ping_timeout) 2011 goto done; 2012 /* 2013 * if the ping timedout then we are in the middle of cleaning up 2014 * and can let the iscsi eh handle it 2015 */ 2016 if (iscsi_has_ping_timed_out(conn)) { 2017 rc = BLK_EH_RESET_TIMER; 2018 goto done; 2019 } 2020 2021 for (i = 0; i < conn->session->cmds_max; i++) { 2022 running_task = conn->session->cmds[i]; 2023 if (!running_task->sc || running_task == task || 2024 running_task->state != ISCSI_TASK_RUNNING) 2025 continue; 2026 2027 /* 2028 * Only check if cmds started before this one have made 2029 * progress, or this could never fail 2030 */ 2031 if (time_after(running_task->sc->jiffies_at_alloc, 2032 task->sc->jiffies_at_alloc)) 2033 continue; 2034 2035 if (time_after(running_task->last_xfer, task->last_timeout)) { 2036 /* 2037 * This task has not made progress, but a task 2038 * started before us has transferred data since 2039 * we started/last-checked. We could be queueing 2040 * too many tasks or the LU is bad. 2041 * 2042 * If the device is bad the cmds ahead of us on 2043 * other devs will complete, and this loop will 2044 * eventually fail starting the scsi eh. 2045 */ 2046 ISCSI_DBG_EH(session, "Command has not made progress " 2047 "but commands ahead of it have. " 2048 "Asking scsi-ml for more time to " 2049 "complete. Our last xfer vs running task " 2050 "last xfer %lu/%lu. Last check %lu.\n", 2051 task->last_xfer, running_task->last_xfer, 2052 task->last_timeout); 2053 rc = BLK_EH_RESET_TIMER; 2054 goto done; 2055 } 2056 } 2057 2058 /* Assumes nop timeout is shorter than scsi cmd timeout */ 2059 if (task->have_checked_conn) 2060 goto done; 2061 2062 /* 2063 * Checking the transport already or nop from a cmd timeout still 2064 * running 2065 */ 2066 if (conn->ping_task) { 2067 task->have_checked_conn = true; 2068 rc = BLK_EH_RESET_TIMER; 2069 goto done; 2070 } 2071 2072 /* Make sure there is a transport check done */ 2073 iscsi_send_nopout(conn, NULL); 2074 task->have_checked_conn = true; 2075 rc = BLK_EH_RESET_TIMER; 2076 2077done: 2078 if (task) 2079 task->last_timeout = jiffies; 2080 spin_unlock(&session->frwd_lock); 2081 ISCSI_DBG_EH(session, "return %s\n", rc == BLK_EH_RESET_TIMER ? 2082 "timer reset" : "nh"); 2083 return rc; 2084} 2085 2086static void iscsi_check_transport_timeouts(unsigned long data) 2087{ 2088 struct iscsi_conn *conn = (struct iscsi_conn *)data; 2089 struct iscsi_session *session = conn->session; 2090 unsigned long recv_timeout, next_timeout = 0, last_recv; 2091 2092 spin_lock(&session->frwd_lock); 2093 if (session->state != ISCSI_STATE_LOGGED_IN) 2094 goto done; 2095 2096 recv_timeout = conn->recv_timeout; 2097 if (!recv_timeout) 2098 goto done; 2099 2100 recv_timeout *= HZ; 2101 last_recv = conn->last_recv; 2102 2103 if (iscsi_has_ping_timed_out(conn)) { 2104 iscsi_conn_printk(KERN_ERR, conn, "ping timeout of %d secs " 2105 "expired, recv timeout %d, last rx %lu, " 2106 "last ping %lu, now %lu\n", 2107 conn->ping_timeout, conn->recv_timeout, 2108 last_recv, conn->last_ping, jiffies); 2109 spin_unlock(&session->frwd_lock); 2110 iscsi_conn_failure(conn, ISCSI_ERR_NOP_TIMEDOUT); 2111 return; 2112 } 2113 2114 if (time_before_eq(last_recv + recv_timeout, jiffies)) { 2115 /* send a ping to try to provoke some traffic */ 2116 ISCSI_DBG_CONN(conn, "Sending nopout as ping\n"); 2117 iscsi_send_nopout(conn, NULL); 2118 next_timeout = conn->last_ping + (conn->ping_timeout * HZ); 2119 } else 2120 next_timeout = last_recv + recv_timeout; 2121 2122 ISCSI_DBG_CONN(conn, "Setting next tmo %lu\n", next_timeout); 2123 mod_timer(&conn->transport_timer, next_timeout); 2124done: 2125 spin_unlock(&session->frwd_lock); 2126} 2127 2128static void iscsi_prep_abort_task_pdu(struct iscsi_task *task, 2129 struct iscsi_tm *hdr) 2130{ 2131 memset(hdr, 0, sizeof(*hdr)); 2132 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; 2133 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK; 2134 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2135 hdr->lun = task->lun; 2136 hdr->rtt = task->hdr_itt; 2137 hdr->refcmdsn = task->cmdsn; 2138} 2139 2140int iscsi_eh_abort(struct scsi_cmnd *sc) 2141{ 2142 struct iscsi_cls_session *cls_session; 2143 struct iscsi_session *session; 2144 struct iscsi_conn *conn; 2145 struct iscsi_task *task; 2146 struct iscsi_tm *hdr; 2147 int rc, age; 2148 2149 cls_session = starget_to_session(scsi_target(sc->device)); 2150 session = cls_session->dd_data; 2151 2152 ISCSI_DBG_EH(session, "aborting sc %p\n", sc); 2153 2154 mutex_lock(&session->eh_mutex); 2155 spin_lock_bh(&session->frwd_lock); 2156 /* 2157 * if session was ISCSI_STATE_IN_RECOVERY then we may not have 2158 * got the command. 2159 */ 2160 if (!sc->SCp.ptr) { 2161 ISCSI_DBG_EH(session, "sc never reached iscsi layer or " 2162 "it completed.\n"); 2163 spin_unlock_bh(&session->frwd_lock); 2164 mutex_unlock(&session->eh_mutex); 2165 return SUCCESS; 2166 } 2167 2168 /* 2169 * If we are not logged in or we have started a new session 2170 * then let the host reset code handle this 2171 */ 2172 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN || 2173 sc->SCp.phase != session->age) { 2174 spin_unlock_bh(&session->frwd_lock); 2175 mutex_unlock(&session->eh_mutex); 2176 ISCSI_DBG_EH(session, "failing abort due to dropped " 2177 "session.\n"); 2178 return FAILED; 2179 } 2180 2181 conn = session->leadconn; 2182 conn->eh_abort_cnt++; 2183 age = session->age; 2184 2185 task = (struct iscsi_task *)sc->SCp.ptr; 2186 ISCSI_DBG_EH(session, "aborting [sc %p itt 0x%x]\n", 2187 sc, task->itt); 2188 2189 /* task completed before time out */ 2190 if (!task->sc) { 2191 ISCSI_DBG_EH(session, "sc completed while abort in progress\n"); 2192 goto success; 2193 } 2194 2195 if (task->state == ISCSI_TASK_PENDING) { 2196 fail_scsi_task(task, DID_ABORT); 2197 goto success; 2198 } 2199 2200 /* only have one tmf outstanding at a time */ 2201 if (conn->tmf_state != TMF_INITIAL) 2202 goto failed; 2203 conn->tmf_state = TMF_QUEUED; 2204 2205 hdr = &conn->tmhdr; 2206 iscsi_prep_abort_task_pdu(task, hdr); 2207 2208 if (iscsi_exec_task_mgmt_fn(conn, hdr, age, session->abort_timeout)) { 2209 rc = FAILED; 2210 goto failed; 2211 } 2212 2213 switch (conn->tmf_state) { 2214 case TMF_SUCCESS: 2215 spin_unlock_bh(&session->frwd_lock); 2216 /* 2217 * stop tx side incase the target had sent a abort rsp but 2218 * the initiator was still writing out data. 2219 */ 2220 iscsi_suspend_tx(conn); 2221 /* 2222 * we do not stop the recv side because targets have been 2223 * good and have never sent us a successful tmf response 2224 * then sent more data for the cmd. 2225 */ 2226 spin_lock_bh(&session->frwd_lock); 2227 fail_scsi_task(task, DID_ABORT); 2228 conn->tmf_state = TMF_INITIAL; 2229 memset(hdr, 0, sizeof(*hdr)); 2230 spin_unlock_bh(&session->frwd_lock); 2231 iscsi_start_tx(conn); 2232 goto success_unlocked; 2233 case TMF_TIMEDOUT: 2234 spin_unlock_bh(&session->frwd_lock); 2235 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); 2236 goto failed_unlocked; 2237 case TMF_NOT_FOUND: 2238 if (!sc->SCp.ptr) { 2239 conn->tmf_state = TMF_INITIAL; 2240 memset(hdr, 0, sizeof(*hdr)); 2241 /* task completed before tmf abort response */ 2242 ISCSI_DBG_EH(session, "sc completed while abort in " 2243 "progress\n"); 2244 goto success; 2245 } 2246 /* fall through */ 2247 default: 2248 conn->tmf_state = TMF_INITIAL; 2249 goto failed; 2250 } 2251 2252success: 2253 spin_unlock_bh(&session->frwd_lock); 2254success_unlocked: 2255 ISCSI_DBG_EH(session, "abort success [sc %p itt 0x%x]\n", 2256 sc, task->itt); 2257 mutex_unlock(&session->eh_mutex); 2258 return SUCCESS; 2259 2260failed: 2261 spin_unlock_bh(&session->frwd_lock); 2262failed_unlocked: 2263 ISCSI_DBG_EH(session, "abort failed [sc %p itt 0x%x]\n", sc, 2264 task ? task->itt : 0); 2265 mutex_unlock(&session->eh_mutex); 2266 return FAILED; 2267} 2268EXPORT_SYMBOL_GPL(iscsi_eh_abort); 2269 2270static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) 2271{ 2272 memset(hdr, 0, sizeof(*hdr)); 2273 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; 2274 hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK; 2275 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2276 int_to_scsilun(sc->device->lun, &hdr->lun); 2277 hdr->rtt = RESERVED_ITT; 2278} 2279 2280int iscsi_eh_device_reset(struct scsi_cmnd *sc) 2281{ 2282 struct iscsi_cls_session *cls_session; 2283 struct iscsi_session *session; 2284 struct iscsi_conn *conn; 2285 struct iscsi_tm *hdr; 2286 int rc = FAILED; 2287 2288 cls_session = starget_to_session(scsi_target(sc->device)); 2289 session = cls_session->dd_data; 2290 2291 ISCSI_DBG_EH(session, "LU Reset [sc %p lun %llu]\n", sc, 2292 sc->device->lun); 2293 2294 mutex_lock(&session->eh_mutex); 2295 spin_lock_bh(&session->frwd_lock); 2296 /* 2297 * Just check if we are not logged in. We cannot check for 2298 * the phase because the reset could come from a ioctl. 2299 */ 2300 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) 2301 goto unlock; 2302 conn = session->leadconn; 2303 2304 /* only have one tmf outstanding at a time */ 2305 if (conn->tmf_state != TMF_INITIAL) 2306 goto unlock; 2307 conn->tmf_state = TMF_QUEUED; 2308 2309 hdr = &conn->tmhdr; 2310 iscsi_prep_lun_reset_pdu(sc, hdr); 2311 2312 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, 2313 session->lu_reset_timeout)) { 2314 rc = FAILED; 2315 goto unlock; 2316 } 2317 2318 switch (conn->tmf_state) { 2319 case TMF_SUCCESS: 2320 break; 2321 case TMF_TIMEDOUT: 2322 spin_unlock_bh(&session->frwd_lock); 2323 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); 2324 goto done; 2325 default: 2326 conn->tmf_state = TMF_INITIAL; 2327 goto unlock; 2328 } 2329 2330 rc = SUCCESS; 2331 spin_unlock_bh(&session->frwd_lock); 2332 2333 iscsi_suspend_tx(conn); 2334 2335 spin_lock_bh(&session->frwd_lock); 2336 memset(hdr, 0, sizeof(*hdr)); 2337 fail_scsi_tasks(conn, sc->device->lun, DID_ERROR); 2338 conn->tmf_state = TMF_INITIAL; 2339 spin_unlock_bh(&session->frwd_lock); 2340 2341 iscsi_start_tx(conn); 2342 goto done; 2343 2344unlock: 2345 spin_unlock_bh(&session->frwd_lock); 2346done: 2347 ISCSI_DBG_EH(session, "dev reset result = %s\n", 2348 rc == SUCCESS ? "SUCCESS" : "FAILED"); 2349 mutex_unlock(&session->eh_mutex); 2350 return rc; 2351} 2352EXPORT_SYMBOL_GPL(iscsi_eh_device_reset); 2353 2354void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session) 2355{ 2356 struct iscsi_session *session = cls_session->dd_data; 2357 2358 spin_lock_bh(&session->frwd_lock); 2359 if (session->state != ISCSI_STATE_LOGGED_IN) { 2360 session->state = ISCSI_STATE_RECOVERY_FAILED; 2361 if (session->leadconn) 2362 wake_up(&session->leadconn->ehwait); 2363 } 2364 spin_unlock_bh(&session->frwd_lock); 2365} 2366EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout); 2367 2368/** 2369 * iscsi_eh_session_reset - drop session and attempt relogin 2370 * @sc: scsi command 2371 * 2372 * This function will wait for a relogin, session termination from 2373 * userspace, or a recovery/replacement timeout. 2374 */ 2375int iscsi_eh_session_reset(struct scsi_cmnd *sc) 2376{ 2377 struct iscsi_cls_session *cls_session; 2378 struct iscsi_session *session; 2379 struct iscsi_conn *conn; 2380 2381 cls_session = starget_to_session(scsi_target(sc->device)); 2382 session = cls_session->dd_data; 2383 conn = session->leadconn; 2384 2385 mutex_lock(&session->eh_mutex); 2386 spin_lock_bh(&session->frwd_lock); 2387 if (session->state == ISCSI_STATE_TERMINATE) { 2388failed: 2389 ISCSI_DBG_EH(session, 2390 "failing session reset: Could not log back into " 2391 "%s, %s [age %d]\n", session->targetname, 2392 conn->persistent_address, session->age); 2393 spin_unlock_bh(&session->frwd_lock); 2394 mutex_unlock(&session->eh_mutex); 2395 return FAILED; 2396 } 2397 2398 spin_unlock_bh(&session->frwd_lock); 2399 mutex_unlock(&session->eh_mutex); 2400 /* 2401 * we drop the lock here but the leadconn cannot be destoyed while 2402 * we are in the scsi eh 2403 */ 2404 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); 2405 2406 ISCSI_DBG_EH(session, "wait for relogin\n"); 2407 wait_event_interruptible(conn->ehwait, 2408 session->state == ISCSI_STATE_TERMINATE || 2409 session->state == ISCSI_STATE_LOGGED_IN || 2410 session->state == ISCSI_STATE_RECOVERY_FAILED); 2411 if (signal_pending(current)) 2412 flush_signals(current); 2413 2414 mutex_lock(&session->eh_mutex); 2415 spin_lock_bh(&session->frwd_lock); 2416 if (session->state == ISCSI_STATE_LOGGED_IN) { 2417 ISCSI_DBG_EH(session, 2418 "session reset succeeded for %s,%s\n", 2419 session->targetname, conn->persistent_address); 2420 } else 2421 goto failed; 2422 spin_unlock_bh(&session->frwd_lock); 2423 mutex_unlock(&session->eh_mutex); 2424 return SUCCESS; 2425} 2426EXPORT_SYMBOL_GPL(iscsi_eh_session_reset); 2427 2428static void iscsi_prep_tgt_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr) 2429{ 2430 memset(hdr, 0, sizeof(*hdr)); 2431 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; 2432 hdr->flags = ISCSI_TM_FUNC_TARGET_WARM_RESET & ISCSI_FLAG_TM_FUNC_MASK; 2433 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 2434 hdr->rtt = RESERVED_ITT; 2435} 2436 2437/** 2438 * iscsi_eh_target_reset - reset target 2439 * @sc: scsi command 2440 * 2441 * This will attempt to send a warm target reset. 2442 */ 2443int iscsi_eh_target_reset(struct scsi_cmnd *sc) 2444{ 2445 struct iscsi_cls_session *cls_session; 2446 struct iscsi_session *session; 2447 struct iscsi_conn *conn; 2448 struct iscsi_tm *hdr; 2449 int rc = FAILED; 2450 2451 cls_session = starget_to_session(scsi_target(sc->device)); 2452 session = cls_session->dd_data; 2453 2454 ISCSI_DBG_EH(session, "tgt Reset [sc %p tgt %s]\n", sc, 2455 session->targetname); 2456 2457 mutex_lock(&session->eh_mutex); 2458 spin_lock_bh(&session->frwd_lock); 2459 /* 2460 * Just check if we are not logged in. We cannot check for 2461 * the phase because the reset could come from a ioctl. 2462 */ 2463 if (!session->leadconn || session->state != ISCSI_STATE_LOGGED_IN) 2464 goto unlock; 2465 conn = session->leadconn; 2466 2467 /* only have one tmf outstanding at a time */ 2468 if (conn->tmf_state != TMF_INITIAL) 2469 goto unlock; 2470 conn->tmf_state = TMF_QUEUED; 2471 2472 hdr = &conn->tmhdr; 2473 iscsi_prep_tgt_reset_pdu(sc, hdr); 2474 2475 if (iscsi_exec_task_mgmt_fn(conn, hdr, session->age, 2476 session->tgt_reset_timeout)) { 2477 rc = FAILED; 2478 goto unlock; 2479 } 2480 2481 switch (conn->tmf_state) { 2482 case TMF_SUCCESS: 2483 break; 2484 case TMF_TIMEDOUT: 2485 spin_unlock_bh(&session->frwd_lock); 2486 iscsi_conn_failure(conn, ISCSI_ERR_SCSI_EH_SESSION_RST); 2487 goto done; 2488 default: 2489 conn->tmf_state = TMF_INITIAL; 2490 goto unlock; 2491 } 2492 2493 rc = SUCCESS; 2494 spin_unlock_bh(&session->frwd_lock); 2495 2496 iscsi_suspend_tx(conn); 2497 2498 spin_lock_bh(&session->frwd_lock); 2499 memset(hdr, 0, sizeof(*hdr)); 2500 fail_scsi_tasks(conn, -1, DID_ERROR); 2501 conn->tmf_state = TMF_INITIAL; 2502 spin_unlock_bh(&session->frwd_lock); 2503 2504 iscsi_start_tx(conn); 2505 goto done; 2506 2507unlock: 2508 spin_unlock_bh(&session->frwd_lock); 2509done: 2510 ISCSI_DBG_EH(session, "tgt %s reset result = %s\n", session->targetname, 2511 rc == SUCCESS ? "SUCCESS" : "FAILED"); 2512 mutex_unlock(&session->eh_mutex); 2513 return rc; 2514} 2515EXPORT_SYMBOL_GPL(iscsi_eh_target_reset); 2516 2517/** 2518 * iscsi_eh_recover_target - reset target and possibly the session 2519 * @sc: scsi command 2520 * 2521 * This will attempt to send a warm target reset. If that fails, 2522 * we will escalate to ERL0 session recovery. 2523 */ 2524int iscsi_eh_recover_target(struct scsi_cmnd *sc) 2525{ 2526 int rc; 2527 2528 rc = iscsi_eh_target_reset(sc); 2529 if (rc == FAILED) 2530 rc = iscsi_eh_session_reset(sc); 2531 return rc; 2532} 2533EXPORT_SYMBOL_GPL(iscsi_eh_recover_target); 2534 2535/* 2536 * Pre-allocate a pool of @max items of @item_size. By default, the pool 2537 * should be accessed via kfifo_{get,put} on q->queue. 2538 * Optionally, the caller can obtain the array of object pointers 2539 * by passing in a non-NULL @items pointer 2540 */ 2541int 2542iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size) 2543{ 2544 int i, num_arrays = 1; 2545 2546 memset(q, 0, sizeof(*q)); 2547 2548 q->max = max; 2549 2550 /* If the user passed an items pointer, he wants a copy of 2551 * the array. */ 2552 if (items) 2553 num_arrays++; 2554 q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL); 2555 if (q->pool == NULL) 2556 return -ENOMEM; 2557 2558 kfifo_init(&q->queue, (void*)q->pool, max * sizeof(void*)); 2559 2560 for (i = 0; i < max; i++) { 2561 q->pool[i] = kzalloc(item_size, GFP_KERNEL); 2562 if (q->pool[i] == NULL) { 2563 q->max = i; 2564 goto enomem; 2565 } 2566 kfifo_in(&q->queue, (void*)&q->pool[i], sizeof(void*)); 2567 } 2568 2569 if (items) { 2570 *items = q->pool + max; 2571 memcpy(*items, q->pool, max * sizeof(void *)); 2572 } 2573 2574 return 0; 2575 2576enomem: 2577 iscsi_pool_free(q); 2578 return -ENOMEM; 2579} 2580EXPORT_SYMBOL_GPL(iscsi_pool_init); 2581 2582void iscsi_pool_free(struct iscsi_pool *q) 2583{ 2584 int i; 2585 2586 for (i = 0; i < q->max; i++) 2587 kfree(q->pool[i]); 2588 kfree(q->pool); 2589} 2590EXPORT_SYMBOL_GPL(iscsi_pool_free); 2591 2592/** 2593 * iscsi_host_add - add host to system 2594 * @shost: scsi host 2595 * @pdev: parent device 2596 * 2597 * This should be called by partial offload and software iscsi drivers 2598 * to add a host to the system. 2599 */ 2600int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev) 2601{ 2602 if (!shost->can_queue) 2603 shost->can_queue = ISCSI_DEF_XMIT_CMDS_MAX; 2604 2605 if (!shost->cmd_per_lun) 2606 shost->cmd_per_lun = ISCSI_DEF_CMD_PER_LUN; 2607 2608 if (!shost->transportt->eh_timed_out) 2609 shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out; 2610 return scsi_add_host(shost, pdev); 2611} 2612EXPORT_SYMBOL_GPL(iscsi_host_add); 2613 2614/** 2615 * iscsi_host_alloc - allocate a host and driver data 2616 * @sht: scsi host template 2617 * @dd_data_size: driver host data size 2618 * @xmit_can_sleep: bool indicating if LLD will queue IO from a work queue 2619 * 2620 * This should be called by partial offload and software iscsi drivers. 2621 * To access the driver specific memory use the iscsi_host_priv() macro. 2622 */ 2623struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht, 2624 int dd_data_size, bool xmit_can_sleep) 2625{ 2626 struct Scsi_Host *shost; 2627 struct iscsi_host *ihost; 2628 2629 shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size); 2630 if (!shost) 2631 return NULL; 2632 ihost = shost_priv(shost); 2633 2634 if (xmit_can_sleep) { 2635 snprintf(ihost->workq_name, sizeof(ihost->workq_name), 2636 "iscsi_q_%d", shost->host_no); 2637 ihost->workq = create_singlethread_workqueue(ihost->workq_name); 2638 if (!ihost->workq) 2639 goto free_host; 2640 } 2641 2642 spin_lock_init(&ihost->lock); 2643 ihost->state = ISCSI_HOST_SETUP; 2644 ihost->num_sessions = 0; 2645 init_waitqueue_head(&ihost->session_removal_wq); 2646 return shost; 2647 2648free_host: 2649 scsi_host_put(shost); 2650 return NULL; 2651} 2652EXPORT_SYMBOL_GPL(iscsi_host_alloc); 2653 2654static void iscsi_notify_host_removed(struct iscsi_cls_session *cls_session) 2655{ 2656 iscsi_session_failure(cls_session->dd_data, ISCSI_ERR_INVALID_HOST); 2657} 2658 2659/** 2660 * iscsi_host_remove - remove host and sessions 2661 * @shost: scsi host 2662 * 2663 * If there are any sessions left, this will initiate the removal and wait 2664 * for the completion. 2665 */ 2666void iscsi_host_remove(struct Scsi_Host *shost) 2667{ 2668 struct iscsi_host *ihost = shost_priv(shost); 2669 unsigned long flags; 2670 2671 spin_lock_irqsave(&ihost->lock, flags); 2672 ihost->state = ISCSI_HOST_REMOVED; 2673 spin_unlock_irqrestore(&ihost->lock, flags); 2674 2675 iscsi_host_for_each_session(shost, iscsi_notify_host_removed); 2676 wait_event_interruptible(ihost->session_removal_wq, 2677 ihost->num_sessions == 0); 2678 if (signal_pending(current)) 2679 flush_signals(current); 2680 2681 scsi_remove_host(shost); 2682 if (ihost->workq) 2683 destroy_workqueue(ihost->workq); 2684} 2685EXPORT_SYMBOL_GPL(iscsi_host_remove); 2686 2687void iscsi_host_free(struct Scsi_Host *shost) 2688{ 2689 struct iscsi_host *ihost = shost_priv(shost); 2690 2691 kfree(ihost->netdev); 2692 kfree(ihost->hwaddress); 2693 kfree(ihost->initiatorname); 2694 scsi_host_put(shost); 2695} 2696EXPORT_SYMBOL_GPL(iscsi_host_free); 2697 2698static void iscsi_host_dec_session_cnt(struct Scsi_Host *shost) 2699{ 2700 struct iscsi_host *ihost = shost_priv(shost); 2701 unsigned long flags; 2702 2703 shost = scsi_host_get(shost); 2704 if (!shost) { 2705 printk(KERN_ERR "Invalid state. Cannot notify host removal " 2706 "of session teardown event because host already " 2707 "removed.\n"); 2708 return; 2709 } 2710 2711 spin_lock_irqsave(&ihost->lock, flags); 2712 ihost->num_sessions--; 2713 if (ihost->num_sessions == 0) 2714 wake_up(&ihost->session_removal_wq); 2715 spin_unlock_irqrestore(&ihost->lock, flags); 2716 scsi_host_put(shost); 2717} 2718 2719/** 2720 * iscsi_session_setup - create iscsi cls session and host and session 2721 * @iscsit: iscsi transport template 2722 * @shost: scsi host 2723 * @cmds_max: session can queue 2724 * @cmd_task_size: LLD task private data size 2725 * @initial_cmdsn: initial CmdSN 2726 * 2727 * This can be used by software iscsi_transports that allocate 2728 * a session per scsi host. 2729 * 2730 * Callers should set cmds_max to the largest total numer (mgmt + scsi) of 2731 * tasks they support. The iscsi layer reserves ISCSI_MGMT_CMDS_MAX tasks 2732 * for nop handling and login/logout requests. 2733 */ 2734struct iscsi_cls_session * 2735iscsi_session_setup(struct iscsi_transport *iscsit, struct Scsi_Host *shost, 2736 uint16_t cmds_max, int dd_size, int cmd_task_size, 2737 uint32_t initial_cmdsn, unsigned int id) 2738{ 2739 struct iscsi_host *ihost = shost_priv(shost); 2740 struct iscsi_session *session; 2741 struct iscsi_cls_session *cls_session; 2742 int cmd_i, scsi_cmds, total_cmds = cmds_max; 2743 unsigned long flags; 2744 2745 spin_lock_irqsave(&ihost->lock, flags); 2746 if (ihost->state == ISCSI_HOST_REMOVED) { 2747 spin_unlock_irqrestore(&ihost->lock, flags); 2748 return NULL; 2749 } 2750 ihost->num_sessions++; 2751 spin_unlock_irqrestore(&ihost->lock, flags); 2752 2753 if (!total_cmds) 2754 total_cmds = ISCSI_DEF_XMIT_CMDS_MAX; 2755 /* 2756 * The iscsi layer needs some tasks for nop handling and tmfs, 2757 * so the cmds_max must at least be greater than ISCSI_MGMT_CMDS_MAX 2758 * + 1 command for scsi IO. 2759 */ 2760 if (total_cmds < ISCSI_TOTAL_CMDS_MIN) { 2761 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " 2762 "must be a power of two that is at least %d.\n", 2763 total_cmds, ISCSI_TOTAL_CMDS_MIN); 2764 goto dec_session_count; 2765 } 2766 2767 if (total_cmds > ISCSI_TOTAL_CMDS_MAX) { 2768 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " 2769 "must be a power of 2 less than or equal to %d.\n", 2770 cmds_max, ISCSI_TOTAL_CMDS_MAX); 2771 total_cmds = ISCSI_TOTAL_CMDS_MAX; 2772 } 2773 2774 if (!is_power_of_2(total_cmds)) { 2775 printk(KERN_ERR "iscsi: invalid can_queue of %d. can_queue " 2776 "must be a power of 2.\n", total_cmds); 2777 total_cmds = rounddown_pow_of_two(total_cmds); 2778 if (total_cmds < ISCSI_TOTAL_CMDS_MIN) 2779 return NULL; 2780 printk(KERN_INFO "iscsi: Rounding can_queue to %d.\n", 2781 total_cmds); 2782 } 2783 scsi_cmds = total_cmds - ISCSI_MGMT_CMDS_MAX; 2784 2785 cls_session = iscsi_alloc_session(shost, iscsit, 2786 sizeof(struct iscsi_session) + 2787 dd_size); 2788 if (!cls_session) 2789 goto dec_session_count; 2790 session = cls_session->dd_data; 2791 session->cls_session = cls_session; 2792 session->host = shost; 2793 session->state = ISCSI_STATE_FREE; 2794 session->fast_abort = 1; 2795 session->tgt_reset_timeout = 30; 2796 session->lu_reset_timeout = 15; 2797 session->abort_timeout = 10; 2798 session->scsi_cmds_max = scsi_cmds; 2799 session->cmds_max = total_cmds; 2800 session->queued_cmdsn = session->cmdsn = initial_cmdsn; 2801 session->exp_cmdsn = initial_cmdsn + 1; 2802 session->max_cmdsn = initial_cmdsn + 1; 2803 session->max_r2t = 1; 2804 session->tt = iscsit; 2805 session->dd_data = cls_session->dd_data + sizeof(*session); 2806 2807 mutex_init(&session->eh_mutex); 2808 spin_lock_init(&session->frwd_lock); 2809 spin_lock_init(&session->back_lock); 2810 2811 /* initialize SCSI PDU commands pool */ 2812 if (iscsi_pool_init(&session->cmdpool, session->cmds_max, 2813 (void***)&session->cmds, 2814 cmd_task_size + sizeof(struct iscsi_task))) 2815 goto cmdpool_alloc_fail; 2816 2817 /* pre-format cmds pool with ITT */ 2818 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { 2819 struct iscsi_task *task = session->cmds[cmd_i]; 2820 2821 if (cmd_task_size) 2822 task->dd_data = &task[1]; 2823 task->itt = cmd_i; 2824 task->state = ISCSI_TASK_FREE; 2825 INIT_LIST_HEAD(&task->running); 2826 } 2827 2828 if (!try_module_get(iscsit->owner)) 2829 goto module_get_fail; 2830 2831 if (iscsi_add_session(cls_session, id)) 2832 goto cls_session_fail; 2833 2834 return cls_session; 2835 2836cls_session_fail: 2837 module_put(iscsit->owner); 2838module_get_fail: 2839 iscsi_pool_free(&session->cmdpool); 2840cmdpool_alloc_fail: 2841 iscsi_free_session(cls_session); 2842dec_session_count: 2843 iscsi_host_dec_session_cnt(shost); 2844 return NULL; 2845} 2846EXPORT_SYMBOL_GPL(iscsi_session_setup); 2847 2848/** 2849 * iscsi_session_teardown - destroy session, host, and cls_session 2850 * @cls_session: iscsi session 2851 * 2852 * The driver must have called iscsi_remove_session before 2853 * calling this. 2854 */ 2855void iscsi_session_teardown(struct iscsi_cls_session *cls_session) 2856{ 2857 struct iscsi_session *session = cls_session->dd_data; 2858 struct module *owner = cls_session->transport->owner; 2859 struct Scsi_Host *shost = session->host; 2860 2861 iscsi_pool_free(&session->cmdpool); 2862 2863 kfree(session->password); 2864 kfree(session->password_in); 2865 kfree(session->username); 2866 kfree(session->username_in); 2867 kfree(session->targetname); 2868 kfree(session->targetalias); 2869 kfree(session->initiatorname); 2870 kfree(session->boot_root); 2871 kfree(session->boot_nic); 2872 kfree(session->boot_target); 2873 kfree(session->ifacename); 2874 kfree(session->portal_type); 2875 kfree(session->discovery_parent_type); 2876 2877 iscsi_destroy_session(cls_session); 2878 iscsi_host_dec_session_cnt(shost); 2879 module_put(owner); 2880} 2881EXPORT_SYMBOL_GPL(iscsi_session_teardown); 2882 2883/** 2884 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn 2885 * @cls_session: iscsi_cls_session 2886 * @dd_size: private driver data size 2887 * @conn_idx: cid 2888 */ 2889struct iscsi_cls_conn * 2890iscsi_conn_setup(struct iscsi_cls_session *cls_session, int dd_size, 2891 uint32_t conn_idx) 2892{ 2893 struct iscsi_session *session = cls_session->dd_data; 2894 struct iscsi_conn *conn; 2895 struct iscsi_cls_conn *cls_conn; 2896 char *data; 2897 2898 cls_conn = iscsi_create_conn(cls_session, sizeof(*conn) + dd_size, 2899 conn_idx); 2900 if (!cls_conn) 2901 return NULL; 2902 conn = cls_conn->dd_data; 2903 memset(conn, 0, sizeof(*conn) + dd_size); 2904 2905 conn->dd_data = cls_conn->dd_data + sizeof(*conn); 2906 conn->session = session; 2907 conn->cls_conn = cls_conn; 2908 conn->c_stage = ISCSI_CONN_INITIAL_STAGE; 2909 conn->id = conn_idx; 2910 conn->exp_statsn = 0; 2911 conn->tmf_state = TMF_INITIAL; 2912 2913 init_timer(&conn->transport_timer); 2914 conn->transport_timer.data = (unsigned long)conn; 2915 conn->transport_timer.function = iscsi_check_transport_timeouts; 2916 2917 INIT_LIST_HEAD(&conn->mgmtqueue); 2918 INIT_LIST_HEAD(&conn->cmdqueue); 2919 INIT_LIST_HEAD(&conn->requeue); 2920 INIT_WORK(&conn->xmitwork, iscsi_xmitworker); 2921 2922 /* allocate login_task used for the login/text sequences */ 2923 spin_lock_bh(&session->frwd_lock); 2924 if (!kfifo_out(&session->cmdpool.queue, 2925 (void*)&conn->login_task, 2926 sizeof(void*))) { 2927 spin_unlock_bh(&session->frwd_lock); 2928 goto login_task_alloc_fail; 2929 } 2930 spin_unlock_bh(&session->frwd_lock); 2931 2932 data = (char *) __get_free_pages(GFP_KERNEL, 2933 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); 2934 if (!data) 2935 goto login_task_data_alloc_fail; 2936 conn->login_task->data = conn->data = data; 2937 2938 init_timer(&conn->tmf_timer); 2939 init_waitqueue_head(&conn->ehwait); 2940 2941 return cls_conn; 2942 2943login_task_data_alloc_fail: 2944 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task, 2945 sizeof(void*)); 2946login_task_alloc_fail: 2947 iscsi_destroy_conn(cls_conn); 2948 return NULL; 2949} 2950EXPORT_SYMBOL_GPL(iscsi_conn_setup); 2951 2952/** 2953 * iscsi_conn_teardown - teardown iscsi connection 2954 * cls_conn: iscsi class connection 2955 * 2956 * TODO: we may need to make this into a two step process 2957 * like scsi-mls remove + put host 2958 */ 2959void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) 2960{ 2961 struct iscsi_conn *conn = cls_conn->dd_data; 2962 struct iscsi_session *session = conn->session; 2963 unsigned long flags; 2964 2965 del_timer_sync(&conn->transport_timer); 2966 2967 spin_lock_bh(&session->frwd_lock); 2968 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT; 2969 if (session->leadconn == conn) { 2970 /* 2971 * leading connection? then give up on recovery. 2972 */ 2973 session->state = ISCSI_STATE_TERMINATE; 2974 wake_up(&conn->ehwait); 2975 } 2976 spin_unlock_bh(&session->frwd_lock); 2977 2978 /* 2979 * Block until all in-progress commands for this connection 2980 * time out or fail. 2981 */ 2982 for (;;) { 2983 spin_lock_irqsave(session->host->host_lock, flags); 2984 if (!atomic_read(&session->host->host_busy)) { /* OK for ERL == 0 */ 2985 spin_unlock_irqrestore(session->host->host_lock, flags); 2986 break; 2987 } 2988 spin_unlock_irqrestore(session->host->host_lock, flags); 2989 msleep_interruptible(500); 2990 iscsi_conn_printk(KERN_INFO, conn, "iscsi conn_destroy(): " 2991 "host_busy %d host_failed %d\n", 2992 atomic_read(&session->host->host_busy), 2993 session->host->host_failed); 2994 /* 2995 * force eh_abort() to unblock 2996 */ 2997 wake_up(&conn->ehwait); 2998 } 2999 3000 /* flush queued up work because we free the connection below */ 3001 iscsi_suspend_tx(conn); 3002 3003 spin_lock_bh(&session->frwd_lock); 3004 free_pages((unsigned long) conn->data, 3005 get_order(ISCSI_DEF_MAX_RECV_SEG_LEN)); 3006 kfree(conn->persistent_address); 3007 kfree(conn->local_ipaddr); 3008 /* regular RX path uses back_lock */ 3009 spin_lock_bh(&session->back_lock); 3010 kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task, 3011 sizeof(void*)); 3012 spin_unlock_bh(&session->back_lock); 3013 if (session->leadconn == conn) 3014 session->leadconn = NULL; 3015 spin_unlock_bh(&session->frwd_lock); 3016 3017 iscsi_destroy_conn(cls_conn); 3018} 3019EXPORT_SYMBOL_GPL(iscsi_conn_teardown); 3020 3021int iscsi_conn_start(struct iscsi_cls_conn *cls_conn) 3022{ 3023 struct iscsi_conn *conn = cls_conn->dd_data; 3024 struct iscsi_session *session = conn->session; 3025 3026 if (!session) { 3027 iscsi_conn_printk(KERN_ERR, conn, 3028 "can't start unbound connection\n"); 3029 return -EPERM; 3030 } 3031 3032 if ((session->imm_data_en || !session->initial_r2t_en) && 3033 session->first_burst > session->max_burst) { 3034 iscsi_conn_printk(KERN_INFO, conn, "invalid burst lengths: " 3035 "first_burst %d max_burst %d\n", 3036 session->first_burst, session->max_burst); 3037 return -EINVAL; 3038 } 3039 3040 if (conn->ping_timeout && !conn->recv_timeout) { 3041 iscsi_conn_printk(KERN_ERR, conn, "invalid recv timeout of " 3042 "zero. Using 5 seconds\n."); 3043 conn->recv_timeout = 5; 3044 } 3045 3046 if (conn->recv_timeout && !conn->ping_timeout) { 3047 iscsi_conn_printk(KERN_ERR, conn, "invalid ping timeout of " 3048 "zero. Using 5 seconds.\n"); 3049 conn->ping_timeout = 5; 3050 } 3051 3052 spin_lock_bh(&session->frwd_lock); 3053 conn->c_stage = ISCSI_CONN_STARTED; 3054 session->state = ISCSI_STATE_LOGGED_IN; 3055 session->queued_cmdsn = session->cmdsn; 3056 3057 conn->last_recv = jiffies; 3058 conn->last_ping = jiffies; 3059 if (conn->recv_timeout && conn->ping_timeout) 3060 mod_timer(&conn->transport_timer, 3061 jiffies + (conn->recv_timeout * HZ)); 3062 3063 switch(conn->stop_stage) { 3064 case STOP_CONN_RECOVER: 3065 /* 3066 * unblock eh_abort() if it is blocked. re-try all 3067 * commands after successful recovery 3068 */ 3069 conn->stop_stage = 0; 3070 conn->tmf_state = TMF_INITIAL; 3071 session->age++; 3072 if (session->age == 16) 3073 session->age = 0; 3074 break; 3075 case STOP_CONN_TERM: 3076 conn->stop_stage = 0; 3077 break; 3078 default: 3079 break; 3080 } 3081 spin_unlock_bh(&session->frwd_lock); 3082 3083 iscsi_unblock_session(session->cls_session); 3084 wake_up(&conn->ehwait); 3085 return 0; 3086} 3087EXPORT_SYMBOL_GPL(iscsi_conn_start); 3088 3089static void 3090fail_mgmt_tasks(struct iscsi_session *session, struct iscsi_conn *conn) 3091{ 3092 struct iscsi_task *task; 3093 int i, state; 3094 3095 for (i = 0; i < conn->session->cmds_max; i++) { 3096 task = conn->session->cmds[i]; 3097 if (task->sc) 3098 continue; 3099 3100 if (task->state == ISCSI_TASK_FREE) 3101 continue; 3102 3103 ISCSI_DBG_SESSION(conn->session, 3104 "failing mgmt itt 0x%x state %d\n", 3105 task->itt, task->state); 3106 state = ISCSI_TASK_ABRT_SESS_RECOV; 3107 if (task->state == ISCSI_TASK_PENDING) 3108 state = ISCSI_TASK_COMPLETED; 3109 iscsi_complete_task(task, state); 3110 3111 } 3112} 3113 3114static void iscsi_start_session_recovery(struct iscsi_session *session, 3115 struct iscsi_conn *conn, int flag) 3116{ 3117 int old_stop_stage; 3118 3119 mutex_lock(&session->eh_mutex); 3120 spin_lock_bh(&session->frwd_lock); 3121 if (conn->stop_stage == STOP_CONN_TERM) { 3122 spin_unlock_bh(&session->frwd_lock); 3123 mutex_unlock(&session->eh_mutex); 3124 return; 3125 } 3126 3127 /* 3128 * When this is called for the in_login state, we only want to clean 3129 * up the login task and connection. We do not need to block and set 3130 * the recovery state again 3131 */ 3132 if (flag == STOP_CONN_TERM) 3133 session->state = ISCSI_STATE_TERMINATE; 3134 else if (conn->stop_stage != STOP_CONN_RECOVER) 3135 session->state = ISCSI_STATE_IN_RECOVERY; 3136 3137 old_stop_stage = conn->stop_stage; 3138 conn->stop_stage = flag; 3139 spin_unlock_bh(&session->frwd_lock); 3140 3141 del_timer_sync(&conn->transport_timer); 3142 iscsi_suspend_tx(conn); 3143 3144 spin_lock_bh(&session->frwd_lock); 3145 conn->c_stage = ISCSI_CONN_STOPPED; 3146 spin_unlock_bh(&session->frwd_lock); 3147 3148 /* 3149 * for connection level recovery we should not calculate 3150 * header digest. conn->hdr_size used for optimization 3151 * in hdr_extract() and will be re-negotiated at 3152 * set_param() time. 3153 */ 3154 if (flag == STOP_CONN_RECOVER) { 3155 conn->hdrdgst_en = 0; 3156 conn->datadgst_en = 0; 3157 if (session->state == ISCSI_STATE_IN_RECOVERY && 3158 old_stop_stage != STOP_CONN_RECOVER) { 3159 ISCSI_DBG_SESSION(session, "blocking session\n"); 3160 iscsi_block_session(session->cls_session); 3161 } 3162 } 3163 3164 /* 3165 * flush queues. 3166 */ 3167 spin_lock_bh(&session->frwd_lock); 3168 fail_scsi_tasks(conn, -1, DID_TRANSPORT_DISRUPTED); 3169 fail_mgmt_tasks(session, conn); 3170 memset(&conn->tmhdr, 0, sizeof(conn->tmhdr)); 3171 spin_unlock_bh(&session->frwd_lock); 3172 mutex_unlock(&session->eh_mutex); 3173} 3174 3175void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) 3176{ 3177 struct iscsi_conn *conn = cls_conn->dd_data; 3178 struct iscsi_session *session = conn->session; 3179 3180 switch (flag) { 3181 case STOP_CONN_RECOVER: 3182 case STOP_CONN_TERM: 3183 iscsi_start_session_recovery(session, conn, flag); 3184 break; 3185 default: 3186 iscsi_conn_printk(KERN_ERR, conn, 3187 "invalid stop flag %d\n", flag); 3188 } 3189} 3190EXPORT_SYMBOL_GPL(iscsi_conn_stop); 3191 3192int iscsi_conn_bind(struct iscsi_cls_session *cls_session, 3193 struct iscsi_cls_conn *cls_conn, int is_leading) 3194{ 3195 struct iscsi_session *session = cls_session->dd_data; 3196 struct iscsi_conn *conn = cls_conn->dd_data; 3197 3198 spin_lock_bh(&session->frwd_lock); 3199 if (is_leading) 3200 session->leadconn = conn; 3201 spin_unlock_bh(&session->frwd_lock); 3202 3203 /* 3204 * Unblock xmitworker(), Login Phase will pass through. 3205 */ 3206 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); 3207 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); 3208 return 0; 3209} 3210EXPORT_SYMBOL_GPL(iscsi_conn_bind); 3211 3212int iscsi_switch_str_param(char **param, char *new_val_buf) 3213{ 3214 char *new_val; 3215 3216 if (*param) { 3217 if (!strcmp(*param, new_val_buf)) 3218 return 0; 3219 } 3220 3221 new_val = kstrdup(new_val_buf, GFP_NOIO); 3222 if (!new_val) 3223 return -ENOMEM; 3224 3225 kfree(*param); 3226 *param = new_val; 3227 return 0; 3228} 3229EXPORT_SYMBOL_GPL(iscsi_switch_str_param); 3230 3231int iscsi_set_param(struct iscsi_cls_conn *cls_conn, 3232 enum iscsi_param param, char *buf, int buflen) 3233{ 3234 struct iscsi_conn *conn = cls_conn->dd_data; 3235 struct iscsi_session *session = conn->session; 3236 int val; 3237 3238 switch(param) { 3239 case ISCSI_PARAM_FAST_ABORT: 3240 sscanf(buf, "%d", &session->fast_abort); 3241 break; 3242 case ISCSI_PARAM_ABORT_TMO: 3243 sscanf(buf, "%d", &session->abort_timeout); 3244 break; 3245 case ISCSI_PARAM_LU_RESET_TMO: 3246 sscanf(buf, "%d", &session->lu_reset_timeout); 3247 break; 3248 case ISCSI_PARAM_TGT_RESET_TMO: 3249 sscanf(buf, "%d", &session->tgt_reset_timeout); 3250 break; 3251 case ISCSI_PARAM_PING_TMO: 3252 sscanf(buf, "%d", &conn->ping_timeout); 3253 break; 3254 case ISCSI_PARAM_RECV_TMO: 3255 sscanf(buf, "%d", &conn->recv_timeout); 3256 break; 3257 case ISCSI_PARAM_MAX_RECV_DLENGTH: 3258 sscanf(buf, "%d", &conn->max_recv_dlength); 3259 break; 3260 case ISCSI_PARAM_MAX_XMIT_DLENGTH: 3261 sscanf(buf, "%d", &conn->max_xmit_dlength); 3262 break; 3263 case ISCSI_PARAM_HDRDGST_EN: 3264 sscanf(buf, "%d", &conn->hdrdgst_en); 3265 break; 3266 case ISCSI_PARAM_DATADGST_EN: 3267 sscanf(buf, "%d", &conn->datadgst_en); 3268 break; 3269 case ISCSI_PARAM_INITIAL_R2T_EN: 3270 sscanf(buf, "%d", &session->initial_r2t_en); 3271 break; 3272 case ISCSI_PARAM_MAX_R2T: 3273 sscanf(buf, "%hu", &session->max_r2t); 3274 break; 3275 case ISCSI_PARAM_IMM_DATA_EN: 3276 sscanf(buf, "%d", &session->imm_data_en); 3277 break; 3278 case ISCSI_PARAM_FIRST_BURST: 3279 sscanf(buf, "%d", &session->first_burst); 3280 break; 3281 case ISCSI_PARAM_MAX_BURST: 3282 sscanf(buf, "%d", &session->max_burst); 3283 break; 3284 case ISCSI_PARAM_PDU_INORDER_EN: 3285 sscanf(buf, "%d", &session->pdu_inorder_en); 3286 break; 3287 case ISCSI_PARAM_DATASEQ_INORDER_EN: 3288 sscanf(buf, "%d", &session->dataseq_inorder_en); 3289 break; 3290 case ISCSI_PARAM_ERL: 3291 sscanf(buf, "%d", &session->erl); 3292 break; 3293 case ISCSI_PARAM_EXP_STATSN: 3294 sscanf(buf, "%u", &conn->exp_statsn); 3295 break; 3296 case ISCSI_PARAM_USERNAME: 3297 return iscsi_switch_str_param(&session->username, buf); 3298 case ISCSI_PARAM_USERNAME_IN: 3299 return iscsi_switch_str_param(&session->username_in, buf); 3300 case ISCSI_PARAM_PASSWORD: 3301 return iscsi_switch_str_param(&session->password, buf); 3302 case ISCSI_PARAM_PASSWORD_IN: 3303 return iscsi_switch_str_param(&session->password_in, buf); 3304 case ISCSI_PARAM_TARGET_NAME: 3305 return iscsi_switch_str_param(&session->targetname, buf); 3306 case ISCSI_PARAM_TARGET_ALIAS: 3307 return iscsi_switch_str_param(&session->targetalias, buf); 3308 case ISCSI_PARAM_TPGT: 3309 sscanf(buf, "%d", &session->tpgt); 3310 break; 3311 case ISCSI_PARAM_PERSISTENT_PORT: 3312 sscanf(buf, "%d", &conn->persistent_port); 3313 break; 3314 case ISCSI_PARAM_PERSISTENT_ADDRESS: 3315 return iscsi_switch_str_param(&conn->persistent_address, buf); 3316 case ISCSI_PARAM_IFACE_NAME: 3317 return iscsi_switch_str_param(&session->ifacename, buf); 3318 case ISCSI_PARAM_INITIATOR_NAME: 3319 return iscsi_switch_str_param(&session->initiatorname, buf); 3320 case ISCSI_PARAM_BOOT_ROOT: 3321 return iscsi_switch_str_param(&session->boot_root, buf); 3322 case ISCSI_PARAM_BOOT_NIC: 3323 return iscsi_switch_str_param(&session->boot_nic, buf); 3324 case ISCSI_PARAM_BOOT_TARGET: 3325 return iscsi_switch_str_param(&session->boot_target, buf); 3326 case ISCSI_PARAM_PORTAL_TYPE: 3327 return iscsi_switch_str_param(&session->portal_type, buf); 3328 case ISCSI_PARAM_DISCOVERY_PARENT_TYPE: 3329 return iscsi_switch_str_param(&session->discovery_parent_type, 3330 buf); 3331 case ISCSI_PARAM_DISCOVERY_SESS: 3332 sscanf(buf, "%d", &val); 3333 session->discovery_sess = !!val; 3334 break; 3335 case ISCSI_PARAM_LOCAL_IPADDR: 3336 return iscsi_switch_str_param(&conn->local_ipaddr, buf); 3337 default: 3338 return -ENOSYS; 3339 } 3340 3341 return 0; 3342} 3343EXPORT_SYMBOL_GPL(iscsi_set_param); 3344 3345int iscsi_session_get_param(struct iscsi_cls_session *cls_session, 3346 enum iscsi_param param, char *buf) 3347{ 3348 struct iscsi_session *session = cls_session->dd_data; 3349 int len; 3350 3351 switch(param) { 3352 case ISCSI_PARAM_FAST_ABORT: 3353 len = sprintf(buf, "%d\n", session->fast_abort); 3354 break; 3355 case ISCSI_PARAM_ABORT_TMO: 3356 len = sprintf(buf, "%d\n", session->abort_timeout); 3357 break; 3358 case ISCSI_PARAM_LU_RESET_TMO: 3359 len = sprintf(buf, "%d\n", session->lu_reset_timeout); 3360 break; 3361 case ISCSI_PARAM_TGT_RESET_TMO: 3362 len = sprintf(buf, "%d\n", session->tgt_reset_timeout); 3363 break; 3364 case ISCSI_PARAM_INITIAL_R2T_EN: 3365 len = sprintf(buf, "%d\n", session->initial_r2t_en); 3366 break; 3367 case ISCSI_PARAM_MAX_R2T: 3368 len = sprintf(buf, "%hu\n", session->max_r2t); 3369 break; 3370 case ISCSI_PARAM_IMM_DATA_EN: 3371 len = sprintf(buf, "%d\n", session->imm_data_en); 3372 break; 3373 case ISCSI_PARAM_FIRST_BURST: 3374 len = sprintf(buf, "%u\n", session->first_burst); 3375 break; 3376 case ISCSI_PARAM_MAX_BURST: 3377 len = sprintf(buf, "%u\n", session->max_burst); 3378 break; 3379 case ISCSI_PARAM_PDU_INORDER_EN: 3380 len = sprintf(buf, "%d\n", session->pdu_inorder_en); 3381 break; 3382 case ISCSI_PARAM_DATASEQ_INORDER_EN: 3383 len = sprintf(buf, "%d\n", session->dataseq_inorder_en); 3384 break; 3385 case ISCSI_PARAM_DEF_TASKMGMT_TMO: 3386 len = sprintf(buf, "%d\n", session->def_taskmgmt_tmo); 3387 break; 3388 case ISCSI_PARAM_ERL: 3389 len = sprintf(buf, "%d\n", session->erl); 3390 break; 3391 case ISCSI_PARAM_TARGET_NAME: 3392 len = sprintf(buf, "%s\n", session->targetname); 3393 break; 3394 case ISCSI_PARAM_TARGET_ALIAS: 3395 len = sprintf(buf, "%s\n", session->targetalias); 3396 break; 3397 case ISCSI_PARAM_TPGT: 3398 len = sprintf(buf, "%d\n", session->tpgt); 3399 break; 3400 case ISCSI_PARAM_USERNAME: 3401 len = sprintf(buf, "%s\n", session->username); 3402 break; 3403 case ISCSI_PARAM_USERNAME_IN: 3404 len = sprintf(buf, "%s\n", session->username_in); 3405 break; 3406 case ISCSI_PARAM_PASSWORD: 3407 len = sprintf(buf, "%s\n", session->password); 3408 break; 3409 case ISCSI_PARAM_PASSWORD_IN: 3410 len = sprintf(buf, "%s\n", session->password_in); 3411 break; 3412 case ISCSI_PARAM_IFACE_NAME: 3413 len = sprintf(buf, "%s\n", session->ifacename); 3414 break; 3415 case ISCSI_PARAM_INITIATOR_NAME: 3416 len = sprintf(buf, "%s\n", session->initiatorname); 3417 break; 3418 case ISCSI_PARAM_BOOT_ROOT: 3419 len = sprintf(buf, "%s\n", session->boot_root); 3420 break; 3421 case ISCSI_PARAM_BOOT_NIC: 3422 len = sprintf(buf, "%s\n", session->boot_nic); 3423 break; 3424 case ISCSI_PARAM_BOOT_TARGET: 3425 len = sprintf(buf, "%s\n", session->boot_target); 3426 break; 3427 case ISCSI_PARAM_AUTO_SND_TGT_DISABLE: 3428 len = sprintf(buf, "%u\n", session->auto_snd_tgt_disable); 3429 break; 3430 case ISCSI_PARAM_DISCOVERY_SESS: 3431 len = sprintf(buf, "%u\n", session->discovery_sess); 3432 break; 3433 case ISCSI_PARAM_PORTAL_TYPE: 3434 len = sprintf(buf, "%s\n", session->portal_type); 3435 break; 3436 case ISCSI_PARAM_CHAP_AUTH_EN: 3437 len = sprintf(buf, "%u\n", session->chap_auth_en); 3438 break; 3439 case ISCSI_PARAM_DISCOVERY_LOGOUT_EN: 3440 len = sprintf(buf, "%u\n", session->discovery_logout_en); 3441 break; 3442 case ISCSI_PARAM_BIDI_CHAP_EN: 3443 len = sprintf(buf, "%u\n", session->bidi_chap_en); 3444 break; 3445 case ISCSI_PARAM_DISCOVERY_AUTH_OPTIONAL: 3446 len = sprintf(buf, "%u\n", session->discovery_auth_optional); 3447 break; 3448 case ISCSI_PARAM_DEF_TIME2WAIT: 3449 len = sprintf(buf, "%d\n", session->time2wait); 3450 break; 3451 case ISCSI_PARAM_DEF_TIME2RETAIN: 3452 len = sprintf(buf, "%d\n", session->time2retain); 3453 break; 3454 case ISCSI_PARAM_TSID: 3455 len = sprintf(buf, "%u\n", session->tsid); 3456 break; 3457 case ISCSI_PARAM_ISID: 3458 len = sprintf(buf, "%02x%02x%02x%02x%02x%02x\n", 3459 session->isid[0], session->isid[1], 3460 session->isid[2], session->isid[3], 3461 session->isid[4], session->isid[5]); 3462 break; 3463 case ISCSI_PARAM_DISCOVERY_PARENT_IDX: 3464 len = sprintf(buf, "%u\n", session->discovery_parent_idx); 3465 break; 3466 case ISCSI_PARAM_DISCOVERY_PARENT_TYPE: 3467 if (session->discovery_parent_type) 3468 len = sprintf(buf, "%s\n", 3469 session->discovery_parent_type); 3470 else 3471 len = sprintf(buf, "\n"); 3472 break; 3473 default: 3474 return -ENOSYS; 3475 } 3476 3477 return len; 3478} 3479EXPORT_SYMBOL_GPL(iscsi_session_get_param); 3480 3481int iscsi_conn_get_addr_param(struct sockaddr_storage *addr, 3482 enum iscsi_param param, char *buf) 3483{ 3484 struct sockaddr_in6 *sin6 = NULL; 3485 struct sockaddr_in *sin = NULL; 3486 int len; 3487 3488 switch (addr->ss_family) { 3489 case AF_INET: 3490 sin = (struct sockaddr_in *)addr; 3491 break; 3492 case AF_INET6: 3493 sin6 = (struct sockaddr_in6 *)addr; 3494 break; 3495 default: 3496 return -EINVAL; 3497 } 3498 3499 switch (param) { 3500 case ISCSI_PARAM_CONN_ADDRESS: 3501 case ISCSI_HOST_PARAM_IPADDRESS: 3502 if (sin) 3503 len = sprintf(buf, "%pI4\n", &sin->sin_addr.s_addr); 3504 else 3505 len = sprintf(buf, "%pI6\n", &sin6->sin6_addr); 3506 break; 3507 case ISCSI_PARAM_CONN_PORT: 3508 case ISCSI_PARAM_LOCAL_PORT: 3509 if (sin) 3510 len = sprintf(buf, "%hu\n", be16_to_cpu(sin->sin_port)); 3511 else 3512 len = sprintf(buf, "%hu\n", 3513 be16_to_cpu(sin6->sin6_port)); 3514 break; 3515 default: 3516 return -EINVAL; 3517 } 3518 3519 return len; 3520} 3521EXPORT_SYMBOL_GPL(iscsi_conn_get_addr_param); 3522 3523int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, 3524 enum iscsi_param param, char *buf) 3525{ 3526 struct iscsi_conn *conn = cls_conn->dd_data; 3527 int len; 3528 3529 switch(param) { 3530 case ISCSI_PARAM_PING_TMO: 3531 len = sprintf(buf, "%u\n", conn->ping_timeout); 3532 break; 3533 case ISCSI_PARAM_RECV_TMO: 3534 len = sprintf(buf, "%u\n", conn->recv_timeout); 3535 break; 3536 case ISCSI_PARAM_MAX_RECV_DLENGTH: 3537 len = sprintf(buf, "%u\n", conn->max_recv_dlength); 3538 break; 3539 case ISCSI_PARAM_MAX_XMIT_DLENGTH: 3540 len = sprintf(buf, "%u\n", conn->max_xmit_dlength); 3541 break; 3542 case ISCSI_PARAM_HDRDGST_EN: 3543 len = sprintf(buf, "%d\n", conn->hdrdgst_en); 3544 break; 3545 case ISCSI_PARAM_DATADGST_EN: 3546 len = sprintf(buf, "%d\n", conn->datadgst_en); 3547 break; 3548 case ISCSI_PARAM_IFMARKER_EN: 3549 len = sprintf(buf, "%d\n", conn->ifmarker_en); 3550 break; 3551 case ISCSI_PARAM_OFMARKER_EN: 3552 len = sprintf(buf, "%d\n", conn->ofmarker_en); 3553 break; 3554 case ISCSI_PARAM_EXP_STATSN: 3555 len = sprintf(buf, "%u\n", conn->exp_statsn); 3556 break; 3557 case ISCSI_PARAM_PERSISTENT_PORT: 3558 len = sprintf(buf, "%d\n", conn->persistent_port); 3559 break; 3560 case ISCSI_PARAM_PERSISTENT_ADDRESS: 3561 len = sprintf(buf, "%s\n", conn->persistent_address); 3562 break; 3563 case ISCSI_PARAM_STATSN: 3564 len = sprintf(buf, "%u\n", conn->statsn); 3565 break; 3566 case ISCSI_PARAM_MAX_SEGMENT_SIZE: 3567 len = sprintf(buf, "%u\n", conn->max_segment_size); 3568 break; 3569 case ISCSI_PARAM_KEEPALIVE_TMO: 3570 len = sprintf(buf, "%u\n", conn->keepalive_tmo); 3571 break; 3572 case ISCSI_PARAM_LOCAL_PORT: 3573 len = sprintf(buf, "%u\n", conn->local_port); 3574 break; 3575 case ISCSI_PARAM_TCP_TIMESTAMP_STAT: 3576 len = sprintf(buf, "%u\n", conn->tcp_timestamp_stat); 3577 break; 3578 case ISCSI_PARAM_TCP_NAGLE_DISABLE: 3579 len = sprintf(buf, "%u\n", conn->tcp_nagle_disable); 3580 break; 3581 case ISCSI_PARAM_TCP_WSF_DISABLE: 3582 len = sprintf(buf, "%u\n", conn->tcp_wsf_disable); 3583 break; 3584 case ISCSI_PARAM_TCP_TIMER_SCALE: 3585 len = sprintf(buf, "%u\n", conn->tcp_timer_scale); 3586 break; 3587 case ISCSI_PARAM_TCP_TIMESTAMP_EN: 3588 len = sprintf(buf, "%u\n", conn->tcp_timestamp_en); 3589 break; 3590 case ISCSI_PARAM_IP_FRAGMENT_DISABLE: 3591 len = sprintf(buf, "%u\n", conn->fragment_disable); 3592 break; 3593 case ISCSI_PARAM_IPV4_TOS: 3594 len = sprintf(buf, "%u\n", conn->ipv4_tos); 3595 break; 3596 case ISCSI_PARAM_IPV6_TC: 3597 len = sprintf(buf, "%u\n", conn->ipv6_traffic_class); 3598 break; 3599 case ISCSI_PARAM_IPV6_FLOW_LABEL: 3600 len = sprintf(buf, "%u\n", conn->ipv6_flow_label); 3601 break; 3602 case ISCSI_PARAM_IS_FW_ASSIGNED_IPV6: 3603 len = sprintf(buf, "%u\n", conn->is_fw_assigned_ipv6); 3604 break; 3605 case ISCSI_PARAM_TCP_XMIT_WSF: 3606 len = sprintf(buf, "%u\n", conn->tcp_xmit_wsf); 3607 break; 3608 case ISCSI_PARAM_TCP_RECV_WSF: 3609 len = sprintf(buf, "%u\n", conn->tcp_recv_wsf); 3610 break; 3611 case ISCSI_PARAM_LOCAL_IPADDR: 3612 len = sprintf(buf, "%s\n", conn->local_ipaddr); 3613 break; 3614 default: 3615 return -ENOSYS; 3616 } 3617 3618 return len; 3619} 3620EXPORT_SYMBOL_GPL(iscsi_conn_get_param); 3621 3622int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param, 3623 char *buf) 3624{ 3625 struct iscsi_host *ihost = shost_priv(shost); 3626 int len; 3627 3628 switch (param) { 3629 case ISCSI_HOST_PARAM_NETDEV_NAME: 3630 len = sprintf(buf, "%s\n", ihost->netdev); 3631 break; 3632 case ISCSI_HOST_PARAM_HWADDRESS: 3633 len = sprintf(buf, "%s\n", ihost->hwaddress); 3634 break; 3635 case ISCSI_HOST_PARAM_INITIATOR_NAME: 3636 len = sprintf(buf, "%s\n", ihost->initiatorname); 3637 break; 3638 default: 3639 return -ENOSYS; 3640 } 3641 3642 return len; 3643} 3644EXPORT_SYMBOL_GPL(iscsi_host_get_param); 3645 3646int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param, 3647 char *buf, int buflen) 3648{ 3649 struct iscsi_host *ihost = shost_priv(shost); 3650 3651 switch (param) { 3652 case ISCSI_HOST_PARAM_NETDEV_NAME: 3653 return iscsi_switch_str_param(&ihost->netdev, buf); 3654 case ISCSI_HOST_PARAM_HWADDRESS: 3655 return iscsi_switch_str_param(&ihost->hwaddress, buf); 3656 case ISCSI_HOST_PARAM_INITIATOR_NAME: 3657 return iscsi_switch_str_param(&ihost->initiatorname, buf); 3658 default: 3659 return -ENOSYS; 3660 } 3661 3662 return 0; 3663} 3664EXPORT_SYMBOL_GPL(iscsi_host_set_param); 3665 3666MODULE_AUTHOR("Mike Christie"); 3667MODULE_DESCRIPTION("iSCSI library functions"); 3668MODULE_LICENSE("GPL"); 3669