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