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/mutex.h> 26#include <linux/kfifo.h> 27#include <linux/delay.h> 28#include <asm/unaligned.h> 29#include <net/tcp.h> 30#include <scsi/scsi_cmnd.h> 31#include <scsi/scsi_device.h> 32#include <scsi/scsi_eh.h> 33#include <scsi/scsi_tcq.h> 34#include <scsi/scsi_host.h> 35#include <scsi/scsi.h> 36#include <scsi/iscsi_proto.h> 37#include <scsi/scsi_transport.h> 38#include <scsi/scsi_transport_iscsi.h> 39#include <scsi/libiscsi.h> 40 41struct iscsi_session * 42class_to_transport_session(struct iscsi_cls_session *cls_session) 43{ 44 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); 45 return iscsi_hostdata(shost->hostdata); 46} 47EXPORT_SYMBOL_GPL(class_to_transport_session); 48 49#define INVALID_SN_DELTA 0xffff 50 51int 52iscsi_check_assign_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr) 53{ 54 uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn); 55 uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn); 56 57 if (max_cmdsn < exp_cmdsn -1 && 58 max_cmdsn > exp_cmdsn - INVALID_SN_DELTA) 59 return ISCSI_ERR_MAX_CMDSN; 60 if (max_cmdsn > session->max_cmdsn || 61 max_cmdsn < session->max_cmdsn - INVALID_SN_DELTA) 62 session->max_cmdsn = max_cmdsn; 63 if (exp_cmdsn > session->exp_cmdsn || 64 exp_cmdsn < session->exp_cmdsn - INVALID_SN_DELTA) 65 session->exp_cmdsn = exp_cmdsn; 66 67 return 0; 68} 69EXPORT_SYMBOL_GPL(iscsi_check_assign_cmdsn); 70 71void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task *ctask, 72 struct iscsi_data *hdr) 73{ 74 struct iscsi_conn *conn = ctask->conn; 75 76 memset(hdr, 0, sizeof(struct iscsi_data)); 77 hdr->ttt = cpu_to_be32(ISCSI_RESERVED_TAG); 78 hdr->datasn = cpu_to_be32(ctask->unsol_datasn); 79 ctask->unsol_datasn++; 80 hdr->opcode = ISCSI_OP_SCSI_DATA_OUT; 81 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); 82 83 hdr->itt = ctask->hdr->itt; 84 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); 85 hdr->offset = cpu_to_be32(ctask->unsol_offset); 86 87 if (ctask->unsol_count > conn->max_xmit_dlength) { 88 hton24(hdr->dlength, conn->max_xmit_dlength); 89 ctask->data_count = conn->max_xmit_dlength; 90 ctask->unsol_offset += ctask->data_count; 91 hdr->flags = 0; 92 } else { 93 hton24(hdr->dlength, ctask->unsol_count); 94 ctask->data_count = ctask->unsol_count; 95 hdr->flags = ISCSI_FLAG_CMD_FINAL; 96 } 97} 98EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu); 99 100/** 101 * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu 102 * @ctask: iscsi cmd task 103 * 104 * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set 105 * fields like dlength or final based on how much data it sends 106 */ 107static void iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask) 108{ 109 struct iscsi_conn *conn = ctask->conn; 110 struct iscsi_session *session = conn->session; 111 struct iscsi_cmd *hdr = ctask->hdr; 112 struct scsi_cmnd *sc = ctask->sc; 113 114 hdr->opcode = ISCSI_OP_SCSI_CMD; 115 hdr->flags = ISCSI_ATTR_SIMPLE; 116 int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun); 117 hdr->itt = build_itt(ctask->itt, conn->id, session->age); 118 hdr->data_length = cpu_to_be32(sc->request_bufflen); 119 hdr->cmdsn = cpu_to_be32(session->cmdsn); 120 session->cmdsn++; 121 hdr->exp_statsn = cpu_to_be32(conn->exp_statsn); 122 memcpy(hdr->cdb, sc->cmnd, sc->cmd_len); 123 memset(&hdr->cdb[sc->cmd_len], 0, MAX_COMMAND_SIZE - sc->cmd_len); 124 125 ctask->data_count = 0; 126 if (sc->sc_data_direction == DMA_TO_DEVICE) { 127 hdr->flags |= ISCSI_FLAG_CMD_WRITE; 128 /* 129 * Write counters: 130 * 131 * imm_count bytes to be sent right after 132 * SCSI PDU Header 133 * 134 * unsol_count bytes(as Data-Out) to be sent 135 * without R2T ack right after 136 * immediate data 137 * 138 * r2t_data_count bytes to be sent via R2T ack's 139 * 140 * pad_count bytes to be sent as zero-padding 141 */ 142 ctask->imm_count = 0; 143 ctask->unsol_count = 0; 144 ctask->unsol_offset = 0; 145 ctask->unsol_datasn = 0; 146 147 if (session->imm_data_en) { 148 if (ctask->total_length >= session->first_burst) 149 ctask->imm_count = min(session->first_burst, 150 conn->max_xmit_dlength); 151 else 152 ctask->imm_count = min(ctask->total_length, 153 conn->max_xmit_dlength); 154 hton24(ctask->hdr->dlength, ctask->imm_count); 155 } else 156 zero_data(ctask->hdr->dlength); 157 158 if (!session->initial_r2t_en) { 159 ctask->unsol_count = min(session->first_burst, 160 ctask->total_length) - ctask->imm_count; 161 ctask->unsol_offset = ctask->imm_count; 162 } 163 164 if (!ctask->unsol_count) 165 /* No unsolicit Data-Out's */ 166 ctask->hdr->flags |= ISCSI_FLAG_CMD_FINAL; 167 } else { 168 ctask->datasn = 0; 169 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 170 zero_data(hdr->dlength); 171 172 if (sc->sc_data_direction == DMA_FROM_DEVICE) 173 hdr->flags |= ISCSI_FLAG_CMD_READ; 174 } 175 176 conn->scsicmd_pdus_cnt++; 177} 178EXPORT_SYMBOL_GPL(iscsi_prep_scsi_cmd_pdu); 179 180/** 181 * iscsi_complete_command - return command back to scsi-ml 182 * @ctask: iscsi cmd task 183 * 184 * Must be called with session lock. 185 * This function returns the scsi command to scsi-ml and returns 186 * the cmd task to the pool of available cmd tasks. 187 */ 188static void iscsi_complete_command(struct iscsi_cmd_task *ctask) 189{ 190 struct iscsi_session *session = ctask->conn->session; 191 struct scsi_cmnd *sc = ctask->sc; 192 193 ctask->state = ISCSI_TASK_COMPLETED; 194 ctask->sc = NULL; 195 /* SCSI eh reuses commands to verify us */ 196 sc->SCp.ptr = NULL; 197 list_del_init(&ctask->running); 198 __kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*)); 199 sc->scsi_done(sc); 200} 201 202static void __iscsi_get_ctask(struct iscsi_cmd_task *ctask) 203{ 204 atomic_inc(&ctask->refcount); 205} 206 207static void iscsi_get_ctask(struct iscsi_cmd_task *ctask) 208{ 209 spin_lock_bh(&ctask->conn->session->lock); 210 __iscsi_get_ctask(ctask); 211 spin_unlock_bh(&ctask->conn->session->lock); 212} 213 214static void __iscsi_put_ctask(struct iscsi_cmd_task *ctask) 215{ 216 if (atomic_dec_and_test(&ctask->refcount)) 217 iscsi_complete_command(ctask); 218} 219 220static void iscsi_put_ctask(struct iscsi_cmd_task *ctask) 221{ 222 spin_lock_bh(&ctask->conn->session->lock); 223 __iscsi_put_ctask(ctask); 224 spin_unlock_bh(&ctask->conn->session->lock); 225} 226 227/** 228 * iscsi_cmd_rsp - SCSI Command Response processing 229 * @conn: iscsi connection 230 * @hdr: iscsi header 231 * @ctask: scsi command task 232 * @data: cmd data buffer 233 * @datalen: len of buffer 234 * 235 * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and 236 * then completes the command and task. 237 **/ 238static int iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 239 struct iscsi_cmd_task *ctask, char *data, 240 int datalen) 241{ 242 int rc; 243 struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr; 244 struct iscsi_session *session = conn->session; 245 struct scsi_cmnd *sc = ctask->sc; 246 247 rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr); 248 if (rc) { 249 sc->result = DID_ERROR << 16; 250 goto out; 251 } 252 253 conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1; 254 255 sc->result = (DID_OK << 16) | rhdr->cmd_status; 256 257 if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) { 258 sc->result = DID_ERROR << 16; 259 goto out; 260 } 261 262 if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) { 263 uint16_t senselen; 264 265 if (datalen < 2) { 266invalid_datalen: 267 printk(KERN_ERR "iscsi: Got CHECK_CONDITION but " 268 "invalid data buffer size of %d\n", datalen); 269 sc->result = DID_BAD_TARGET << 16; 270 goto out; 271 } 272 273 senselen = be16_to_cpu(get_unaligned((__be16 *) data)); 274 if (datalen < senselen) 275 goto invalid_datalen; 276 277 memcpy(sc->sense_buffer, data + 2, 278 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); 279 debug_scsi("copied %d bytes of sense\n", 280 min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); 281 } 282 283 if (sc->sc_data_direction == DMA_TO_DEVICE) 284 goto out; 285 286 if (rhdr->flags & ISCSI_FLAG_CMD_UNDERFLOW) { 287 int res_count = be32_to_cpu(rhdr->residual_count); 288 289 if (res_count > 0 && res_count <= sc->request_bufflen) 290 sc->resid = res_count; 291 else 292 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; 293 } else if (rhdr->flags & ISCSI_FLAG_CMD_BIDI_UNDERFLOW) 294 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status; 295 else if (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW) 296 sc->resid = be32_to_cpu(rhdr->residual_count); 297 298out: 299 debug_scsi("done [sc %lx res %d itt 0x%x]\n", 300 (long)sc, sc->result, ctask->itt); 301 conn->scsirsp_pdus_cnt++; 302 303 __iscsi_put_ctask(ctask); 304 return rc; 305} 306 307static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr) 308{ 309 struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr; 310 311 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; 312 conn->tmfrsp_pdus_cnt++; 313 314 if (conn->tmabort_state != TMABORT_INITIAL) 315 return; 316 317 if (tmf->response == ISCSI_TMF_RSP_COMPLETE) 318 conn->tmabort_state = TMABORT_SUCCESS; 319 else if (tmf->response == ISCSI_TMF_RSP_NO_TASK) 320 conn->tmabort_state = TMABORT_NOT_FOUND; 321 else 322 conn->tmabort_state = TMABORT_FAILED; 323 wake_up(&conn->ehwait); 324} 325 326static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 327 char *data, int datalen) 328{ 329 struct iscsi_reject *reject = (struct iscsi_reject *)hdr; 330 struct iscsi_hdr rejected_pdu; 331 uint32_t itt; 332 333 conn->exp_statsn = be32_to_cpu(reject->statsn) + 1; 334 335 if (reject->reason == ISCSI_REASON_DATA_DIGEST_ERROR) { 336 if (ntoh24(reject->dlength) > datalen) 337 return ISCSI_ERR_PROTO; 338 339 if (ntoh24(reject->dlength) >= sizeof(struct iscsi_hdr)) { 340 memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr)); 341 itt = get_itt(rejected_pdu.itt); 342 printk(KERN_ERR "itt 0x%x had pdu (op 0x%x) rejected " 343 "due to DataDigest error.\n", itt, 344 rejected_pdu.opcode); 345 } 346 } 347 return 0; 348} 349 350/** 351 * __iscsi_complete_pdu - complete pdu 352 * @conn: iscsi conn 353 * @hdr: iscsi header 354 * @data: data buffer 355 * @datalen: len of data buffer 356 * 357 * Completes pdu processing by freeing any resources allocated at 358 * queuecommand or send generic. session lock must be held and verify 359 * itt must have been called. 360 */ 361int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 362 char *data, int datalen) 363{ 364 struct iscsi_session *session = conn->session; 365 int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0; 366 struct iscsi_cmd_task *ctask; 367 struct iscsi_mgmt_task *mtask; 368 uint32_t itt; 369 370 if (hdr->itt != RESERVED_ITT) 371 itt = get_itt(hdr->itt); 372 else 373 itt = ~0U; 374 375 if (itt < session->cmds_max) { 376 ctask = session->cmds[itt]; 377 378 debug_scsi("cmdrsp [op 0x%x cid %d itt 0x%x len %d]\n", 379 opcode, conn->id, ctask->itt, datalen); 380 381 switch(opcode) { 382 case ISCSI_OP_SCSI_CMD_RSP: 383 BUG_ON((void*)ctask != ctask->sc->SCp.ptr); 384 rc = iscsi_scsi_cmd_rsp(conn, hdr, ctask, data, 385 datalen); 386 break; 387 case ISCSI_OP_SCSI_DATA_IN: 388 BUG_ON((void*)ctask != ctask->sc->SCp.ptr); 389 if (hdr->flags & ISCSI_FLAG_DATA_STATUS) { 390 conn->scsirsp_pdus_cnt++; 391 __iscsi_put_ctask(ctask); 392 } 393 break; 394 case ISCSI_OP_R2T: 395 /* LLD handles this for now */ 396 break; 397 default: 398 rc = ISCSI_ERR_BAD_OPCODE; 399 break; 400 } 401 } else if (itt >= ISCSI_MGMT_ITT_OFFSET && 402 itt < ISCSI_MGMT_ITT_OFFSET + session->mgmtpool_max) { 403 mtask = session->mgmt_cmds[itt - ISCSI_MGMT_ITT_OFFSET]; 404 405 debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n", 406 opcode, conn->id, mtask->itt, datalen); 407 408 rc = iscsi_check_assign_cmdsn(session, 409 (struct iscsi_nopin*)hdr); 410 if (rc) 411 goto done; 412 413 switch(opcode) { 414 case ISCSI_OP_LOGOUT_RSP: 415 if (datalen) { 416 rc = ISCSI_ERR_PROTO; 417 break; 418 } 419 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; 420 /* fall through */ 421 case ISCSI_OP_LOGIN_RSP: 422 case ISCSI_OP_TEXT_RSP: 423 /* 424 * login related PDU's exp_statsn is handled in 425 * userspace 426 */ 427 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) 428 rc = ISCSI_ERR_CONN_FAILED; 429 list_del(&mtask->running); 430 if (conn->login_mtask != mtask) 431 __kfifo_put(session->mgmtpool.queue, 432 (void*)&mtask, sizeof(void*)); 433 break; 434 case ISCSI_OP_SCSI_TMFUNC_RSP: 435 if (datalen) { 436 rc = ISCSI_ERR_PROTO; 437 break; 438 } 439 440 iscsi_tmf_rsp(conn, hdr); 441 break; 442 case ISCSI_OP_NOOP_IN: 443 if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) { 444 rc = ISCSI_ERR_PROTO; 445 break; 446 } 447 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; 448 449 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) 450 rc = ISCSI_ERR_CONN_FAILED; 451 list_del(&mtask->running); 452 if (conn->login_mtask != mtask) 453 __kfifo_put(session->mgmtpool.queue, 454 (void*)&mtask, sizeof(void*)); 455 break; 456 default: 457 rc = ISCSI_ERR_BAD_OPCODE; 458 break; 459 } 460 } else if (itt == ~0U) { 461 rc = iscsi_check_assign_cmdsn(session, 462 (struct iscsi_nopin*)hdr); 463 if (rc) 464 goto done; 465 466 switch(opcode) { 467 case ISCSI_OP_NOOP_IN: 468 if (datalen) { 469 rc = ISCSI_ERR_PROTO; 470 break; 471 } 472 473 if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG)) 474 break; 475 476 if (iscsi_recv_pdu(conn->cls_conn, hdr, NULL, 0)) 477 rc = ISCSI_ERR_CONN_FAILED; 478 break; 479 case ISCSI_OP_REJECT: 480 rc = iscsi_handle_reject(conn, hdr, data, datalen); 481 break; 482 case ISCSI_OP_ASYNC_EVENT: 483 conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1; 484 if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen)) 485 rc = ISCSI_ERR_CONN_FAILED; 486 break; 487 default: 488 rc = ISCSI_ERR_BAD_OPCODE; 489 break; 490 } 491 } else 492 rc = ISCSI_ERR_BAD_ITT; 493 494done: 495 return rc; 496} 497EXPORT_SYMBOL_GPL(__iscsi_complete_pdu); 498 499int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 500 char *data, int datalen) 501{ 502 int rc; 503 504 spin_lock(&conn->session->lock); 505 rc = __iscsi_complete_pdu(conn, hdr, data, datalen); 506 spin_unlock(&conn->session->lock); 507 return rc; 508} 509EXPORT_SYMBOL_GPL(iscsi_complete_pdu); 510 511/* verify itt (itt encoding: age+cid+itt) */ 512int iscsi_verify_itt(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 513 uint32_t *ret_itt) 514{ 515 struct iscsi_session *session = conn->session; 516 struct iscsi_cmd_task *ctask; 517 uint32_t itt; 518 519 if (hdr->itt != RESERVED_ITT) { 520 if (((__force u32)hdr->itt & ISCSI_AGE_MASK) != 521 (session->age << ISCSI_AGE_SHIFT)) { 522 printk(KERN_ERR "iscsi: received itt %x expected " 523 "session age (%x)\n", (__force u32)hdr->itt, 524 session->age & ISCSI_AGE_MASK); 525 return ISCSI_ERR_BAD_ITT; 526 } 527 528 if (((__force u32)hdr->itt & ISCSI_CID_MASK) != 529 (conn->id << ISCSI_CID_SHIFT)) { 530 printk(KERN_ERR "iscsi: received itt %x, expected " 531 "CID (%x)\n", (__force u32)hdr->itt, conn->id); 532 return ISCSI_ERR_BAD_ITT; 533 } 534 itt = get_itt(hdr->itt); 535 } else 536 itt = ~0U; 537 538 if (itt < session->cmds_max) { 539 ctask = session->cmds[itt]; 540 541 if (!ctask->sc) { 542 printk(KERN_INFO "iscsi: dropping ctask with " 543 "itt 0x%x\n", ctask->itt); 544 /* force drop */ 545 return ISCSI_ERR_NO_SCSI_CMD; 546 } 547 548 if (ctask->sc->SCp.phase != session->age) { 549 printk(KERN_ERR "iscsi: ctask's session age %d, " 550 "expected %d\n", ctask->sc->SCp.phase, 551 session->age); 552 return ISCSI_ERR_SESSION_FAILED; 553 } 554 } 555 556 *ret_itt = itt; 557 return 0; 558} 559EXPORT_SYMBOL_GPL(iscsi_verify_itt); 560 561void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err) 562{ 563 struct iscsi_session *session = conn->session; 564 unsigned long flags; 565 566 spin_lock_irqsave(&session->lock, flags); 567 if (session->state == ISCSI_STATE_FAILED) { 568 spin_unlock_irqrestore(&session->lock, flags); 569 return; 570 } 571 572 if (conn->stop_stage == 0) 573 session->state = ISCSI_STATE_FAILED; 574 spin_unlock_irqrestore(&session->lock, flags); 575 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); 576 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); 577 iscsi_conn_error(conn->cls_conn, err); 578} 579EXPORT_SYMBOL_GPL(iscsi_conn_failure); 580 581static int iscsi_xmit_mtask(struct iscsi_conn *conn) 582{ 583 struct iscsi_hdr *hdr = conn->mtask->hdr; 584 int rc, was_logout = 0; 585 586 if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT) { 587 conn->session->state = ISCSI_STATE_IN_RECOVERY; 588 iscsi_block_session(session_to_cls(conn->session)); 589 was_logout = 1; 590 } 591 rc = conn->session->tt->xmit_mgmt_task(conn, conn->mtask); 592 if (rc) 593 return rc; 594 595 /* done with this in-progress mtask */ 596 conn->mtask = NULL; 597 598 if (was_logout) { 599 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); 600 return -ENODATA; 601 } 602 return 0; 603} 604 605/** 606 * iscsi_data_xmit - xmit any command into the scheduled connection 607 * @conn: iscsi connection 608 * 609 * Notes: 610 * The function can return -EAGAIN in which case the caller must 611 * re-schedule it again later or recover. '0' return code means 612 * successful xmit. 613 **/ 614static int iscsi_data_xmit(struct iscsi_conn *conn) 615{ 616 struct iscsi_transport *tt; 617 int rc = 0; 618 619 if (unlikely(conn->suspend_tx)) { 620 debug_scsi("conn %d Tx suspended!\n", conn->id); 621 return -ENODATA; 622 } 623 tt = conn->session->tt; 624 625 /* 626 * Transmit in the following order: 627 * 628 * 1) un-finished xmit (ctask or mtask) 629 * 2) immediate control PDUs 630 * 3) write data 631 * 4) SCSI commands 632 * 5) non-immediate control PDUs 633 * 634 * No need to lock around __kfifo_get as long as 635 * there's one producer and one consumer. 636 */ 637 638 BUG_ON(conn->ctask && conn->mtask); 639 640 if (conn->ctask) { 641 iscsi_get_ctask(conn->ctask); 642 rc = tt->xmit_cmd_task(conn, conn->ctask); 643 iscsi_put_ctask(conn->ctask); 644 if (rc) 645 goto again; 646 /* done with this in-progress ctask */ 647 conn->ctask = NULL; 648 } 649 if (conn->mtask) { 650 rc = iscsi_xmit_mtask(conn); 651 if (rc) 652 goto again; 653 } 654 655 /* process immediate first */ 656 if (unlikely(__kfifo_len(conn->immqueue))) { 657 while (__kfifo_get(conn->immqueue, (void*)&conn->mtask, 658 sizeof(void*))) { 659 spin_lock_bh(&conn->session->lock); 660 list_add_tail(&conn->mtask->running, 661 &conn->mgmt_run_list); 662 spin_unlock_bh(&conn->session->lock); 663 rc = iscsi_xmit_mtask(conn); 664 if (rc) 665 goto again; 666 } 667 } 668 669 /* process command queue */ 670 spin_lock_bh(&conn->session->lock); 671 while (!list_empty(&conn->xmitqueue)) { 672 /* 673 * iscsi tcp may readd the task to the xmitqueue to send 674 * write data 675 */ 676 conn->ctask = list_entry(conn->xmitqueue.next, 677 struct iscsi_cmd_task, running); 678 conn->ctask->state = ISCSI_TASK_RUNNING; 679 list_move_tail(conn->xmitqueue.next, &conn->run_list); 680 __iscsi_get_ctask(conn->ctask); 681 spin_unlock_bh(&conn->session->lock); 682 683 rc = tt->xmit_cmd_task(conn, conn->ctask); 684 685 spin_lock_bh(&conn->session->lock); 686 __iscsi_put_ctask(conn->ctask); 687 if (rc) { 688 spin_unlock_bh(&conn->session->lock); 689 goto again; 690 } 691 } 692 spin_unlock_bh(&conn->session->lock); 693 /* done with this ctask */ 694 conn->ctask = NULL; 695 696 /* process the rest control plane PDUs, if any */ 697 if (unlikely(__kfifo_len(conn->mgmtqueue))) { 698 while (__kfifo_get(conn->mgmtqueue, (void*)&conn->mtask, 699 sizeof(void*))) { 700 spin_lock_bh(&conn->session->lock); 701 list_add_tail(&conn->mtask->running, 702 &conn->mgmt_run_list); 703 spin_unlock_bh(&conn->session->lock); 704 rc = iscsi_xmit_mtask(conn); 705 if (rc) 706 goto again; 707 } 708 } 709 710 return -ENODATA; 711 712again: 713 if (unlikely(conn->suspend_tx)) 714 return -ENODATA; 715 716 return rc; 717} 718 719static void iscsi_xmitworker(struct work_struct *work) 720{ 721 struct iscsi_conn *conn = 722 container_of(work, struct iscsi_conn, xmitwork); 723 int rc; 724 /* 725 * serialize Xmit worker on a per-connection basis. 726 */ 727 mutex_lock(&conn->xmitmutex); 728 do { 729 rc = iscsi_data_xmit(conn); 730 } while (rc >= 0 || rc == -EAGAIN); 731 mutex_unlock(&conn->xmitmutex); 732} 733 734enum { 735 FAILURE_BAD_HOST = 1, 736 FAILURE_SESSION_FAILED, 737 FAILURE_SESSION_FREED, 738 FAILURE_WINDOW_CLOSED, 739 FAILURE_OOM, 740 FAILURE_SESSION_TERMINATE, 741 FAILURE_SESSION_IN_RECOVERY, 742 FAILURE_SESSION_RECOVERY_TIMEOUT, 743}; 744 745int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *)) 746{ 747 struct Scsi_Host *host; 748 int reason = 0; 749 struct iscsi_session *session; 750 struct iscsi_conn *conn; 751 struct iscsi_cmd_task *ctask = NULL; 752 753 sc->scsi_done = done; 754 sc->result = 0; 755 sc->SCp.ptr = NULL; 756 757 host = sc->device->host; 758 session = iscsi_hostdata(host->hostdata); 759 760 spin_lock(&session->lock); 761 762 /* 763 * ISCSI_STATE_FAILED is a temp. state. The recovery 764 * code will decide what is best to do with command queued 765 * during this time 766 */ 767 if (session->state != ISCSI_STATE_LOGGED_IN && 768 session->state != ISCSI_STATE_FAILED) { 769 /* 770 * to handle the race between when we set the recovery state 771 * and block the session we requeue here (commands could 772 * be entering our queuecommand while a block is starting 773 * up because the block code is not locked) 774 */ 775 if (session->state == ISCSI_STATE_IN_RECOVERY) { 776 reason = FAILURE_SESSION_IN_RECOVERY; 777 goto reject; 778 } 779 780 if (session->state == ISCSI_STATE_RECOVERY_FAILED) 781 reason = FAILURE_SESSION_RECOVERY_TIMEOUT; 782 else if (session->state == ISCSI_STATE_TERMINATE) 783 reason = FAILURE_SESSION_TERMINATE; 784 else 785 reason = FAILURE_SESSION_FREED; 786 goto fault; 787 } 788 789 /* 790 * Check for iSCSI window and take care of CmdSN wrap-around 791 */ 792 if ((int)(session->max_cmdsn - session->cmdsn) < 0) { 793 reason = FAILURE_WINDOW_CLOSED; 794 goto reject; 795 } 796 797 conn = session->leadconn; 798 if (!conn) { 799 reason = FAILURE_SESSION_FREED; 800 goto fault; 801 } 802 803 if (!__kfifo_get(session->cmdpool.queue, (void*)&ctask, 804 sizeof(void*))) { 805 reason = FAILURE_OOM; 806 goto reject; 807 } 808 sc->SCp.phase = session->age; 809 sc->SCp.ptr = (char *)ctask; 810 811 atomic_set(&ctask->refcount, 1); 812 ctask->state = ISCSI_TASK_PENDING; 813 ctask->mtask = NULL; 814 ctask->conn = conn; 815 ctask->sc = sc; 816 INIT_LIST_HEAD(&ctask->running); 817 ctask->total_length = sc->request_bufflen; 818 iscsi_prep_scsi_cmd_pdu(ctask); 819 820 session->tt->init_cmd_task(ctask); 821 822 list_add_tail(&ctask->running, &conn->xmitqueue); 823 debug_scsi( 824 "ctask enq [%s cid %d sc %p cdb 0x%x itt 0x%x len %d cmdsn %d " 825 "win %d]\n", 826 sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read", 827 conn->id, sc, sc->cmnd[0], ctask->itt, sc->request_bufflen, 828 session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1); 829 spin_unlock(&session->lock); 830 831 scsi_queue_work(host, &conn->xmitwork); 832 return 0; 833 834reject: 835 spin_unlock(&session->lock); 836 debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason); 837 return SCSI_MLQUEUE_HOST_BUSY; 838 839fault: 840 spin_unlock(&session->lock); 841 printk(KERN_ERR "iscsi: cmd 0x%x is not queued (%d)\n", 842 sc->cmnd[0], reason); 843 sc->result = (DID_NO_CONNECT << 16); 844 sc->resid = sc->request_bufflen; 845 sc->scsi_done(sc); 846 return 0; 847} 848EXPORT_SYMBOL_GPL(iscsi_queuecommand); 849 850int iscsi_change_queue_depth(struct scsi_device *sdev, int depth) 851{ 852 if (depth > ISCSI_MAX_CMD_PER_LUN) 853 depth = ISCSI_MAX_CMD_PER_LUN; 854 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); 855 return sdev->queue_depth; 856} 857EXPORT_SYMBOL_GPL(iscsi_change_queue_depth); 858 859static int 860iscsi_conn_send_generic(struct iscsi_conn *conn, struct iscsi_hdr *hdr, 861 char *data, uint32_t data_size) 862{ 863 struct iscsi_session *session = conn->session; 864 struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr; 865 struct iscsi_mgmt_task *mtask; 866 867 spin_lock_bh(&session->lock); 868 if (session->state == ISCSI_STATE_TERMINATE) { 869 spin_unlock_bh(&session->lock); 870 return -EPERM; 871 } 872 if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) || 873 hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE)) 874 /* 875 * Login and Text are sent serially, in 876 * request-followed-by-response sequence. 877 * Same mtask can be used. Same ITT must be used. 878 * Note that login_mtask is preallocated at conn_create(). 879 */ 880 mtask = conn->login_mtask; 881 else { 882 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE); 883 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED); 884 885 nop->exp_statsn = cpu_to_be32(conn->exp_statsn); 886 if (!__kfifo_get(session->mgmtpool.queue, 887 (void*)&mtask, sizeof(void*))) { 888 spin_unlock_bh(&session->lock); 889 return -ENOSPC; 890 } 891 } 892 893 /* 894 * pre-format CmdSN for outgoing PDU. 895 */ 896 if (hdr->itt != RESERVED_ITT) { 897 hdr->itt = build_itt(mtask->itt, conn->id, session->age); 898 nop->cmdsn = cpu_to_be32(session->cmdsn); 899 if (conn->c_stage == ISCSI_CONN_STARTED && 900 !(hdr->opcode & ISCSI_OP_IMMEDIATE)) 901 session->cmdsn++; 902 } else 903 /* do not advance CmdSN */ 904 nop->cmdsn = cpu_to_be32(session->cmdsn); 905 906 if (data_size) { 907 memcpy(mtask->data, data, data_size); 908 mtask->data_count = data_size; 909 } else 910 mtask->data_count = 0; 911 912 INIT_LIST_HEAD(&mtask->running); 913 memcpy(mtask->hdr, hdr, sizeof(struct iscsi_hdr)); 914 if (session->tt->init_mgmt_task) 915 session->tt->init_mgmt_task(conn, mtask, data, data_size); 916 spin_unlock_bh(&session->lock); 917 918 debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n", 919 hdr->opcode, hdr->itt, data_size); 920 921 /* 922 * since send_pdu() could be called at least from two contexts, 923 * we need to serialize __kfifo_put, so we don't have to take 924 * additional lock on fast data-path 925 */ 926 if (hdr->opcode & ISCSI_OP_IMMEDIATE) 927 __kfifo_put(conn->immqueue, (void*)&mtask, sizeof(void*)); 928 else 929 __kfifo_put(conn->mgmtqueue, (void*)&mtask, sizeof(void*)); 930 931 scsi_queue_work(session->host, &conn->xmitwork); 932 return 0; 933} 934 935int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr, 936 char *data, uint32_t data_size) 937{ 938 struct iscsi_conn *conn = cls_conn->dd_data; 939 int rc; 940 941 mutex_lock(&conn->xmitmutex); 942 rc = iscsi_conn_send_generic(conn, hdr, data, data_size); 943 mutex_unlock(&conn->xmitmutex); 944 945 return rc; 946} 947EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu); 948 949void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session) 950{ 951 struct iscsi_session *session = class_to_transport_session(cls_session); 952 struct iscsi_conn *conn = session->leadconn; 953 954 spin_lock_bh(&session->lock); 955 if (session->state != ISCSI_STATE_LOGGED_IN) { 956 session->state = ISCSI_STATE_RECOVERY_FAILED; 957 if (conn) 958 wake_up(&conn->ehwait); 959 } 960 spin_unlock_bh(&session->lock); 961} 962EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout); 963 964int iscsi_eh_host_reset(struct scsi_cmnd *sc) 965{ 966 struct Scsi_Host *host = sc->device->host; 967 struct iscsi_session *session = iscsi_hostdata(host->hostdata); 968 struct iscsi_conn *conn = session->leadconn; 969 int fail_session = 0; 970 971 spin_lock_bh(&session->lock); 972 if (session->state == ISCSI_STATE_TERMINATE) { 973failed: 974 debug_scsi("failing host reset: session terminated " 975 "[CID %d age %d]\n", conn->id, session->age); 976 spin_unlock_bh(&session->lock); 977 return FAILED; 978 } 979 980 if (sc->SCp.phase == session->age) { 981 debug_scsi("failing connection CID %d due to SCSI host reset\n", 982 conn->id); 983 fail_session = 1; 984 } 985 spin_unlock_bh(&session->lock); 986 987 /* 988 * we drop the lock here but the leadconn cannot be destoyed while 989 * we are in the scsi eh 990 */ 991 if (fail_session) 992 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); 993 994 debug_scsi("iscsi_eh_host_reset wait for relogin\n"); 995 wait_event_interruptible(conn->ehwait, 996 session->state == ISCSI_STATE_TERMINATE || 997 session->state == ISCSI_STATE_LOGGED_IN || 998 session->state == ISCSI_STATE_RECOVERY_FAILED); 999 if (signal_pending(current)) 1000 flush_signals(current); 1001 1002 spin_lock_bh(&session->lock); 1003 if (session->state == ISCSI_STATE_LOGGED_IN) 1004 printk(KERN_INFO "iscsi: host reset succeeded\n"); 1005 else 1006 goto failed; 1007 spin_unlock_bh(&session->lock); 1008 1009 return SUCCESS; 1010} 1011EXPORT_SYMBOL_GPL(iscsi_eh_host_reset); 1012 1013static void iscsi_tmabort_timedout(unsigned long data) 1014{ 1015 struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)data; 1016 struct iscsi_conn *conn = ctask->conn; 1017 struct iscsi_session *session = conn->session; 1018 1019 spin_lock(&session->lock); 1020 if (conn->tmabort_state == TMABORT_INITIAL) { 1021 conn->tmabort_state = TMABORT_TIMEDOUT; 1022 debug_scsi("tmabort timedout [sc %p itt 0x%x]\n", 1023 ctask->sc, ctask->itt); 1024 /* unblock eh_abort() */ 1025 wake_up(&conn->ehwait); 1026 } 1027 spin_unlock(&session->lock); 1028} 1029 1030/* must be called with the mutex lock */ 1031static int iscsi_exec_abort_task(struct scsi_cmnd *sc, 1032 struct iscsi_cmd_task *ctask) 1033{ 1034 struct iscsi_conn *conn = ctask->conn; 1035 struct iscsi_session *session = conn->session; 1036 struct iscsi_tm *hdr = &conn->tmhdr; 1037 int rc; 1038 1039 /* 1040 * ctask timed out but session is OK requests must be serialized. 1041 */ 1042 memset(hdr, 0, sizeof(struct iscsi_tm)); 1043 hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE; 1044 hdr->flags = ISCSI_TM_FUNC_ABORT_TASK; 1045 hdr->flags |= ISCSI_FLAG_CMD_FINAL; 1046 memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun)); 1047 hdr->rtt = ctask->hdr->itt; 1048 hdr->refcmdsn = ctask->hdr->cmdsn; 1049 1050 rc = iscsi_conn_send_generic(conn, (struct iscsi_hdr *)hdr, 1051 NULL, 0); 1052 if (rc) { 1053 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); 1054 debug_scsi("abort sent failure [itt 0x%x] %d\n", ctask->itt, 1055 rc); 1056 return rc; 1057 } 1058 1059 debug_scsi("abort sent [itt 0x%x]\n", ctask->itt); 1060 1061 spin_lock_bh(&session->lock); 1062 ctask->mtask = (struct iscsi_mgmt_task *) 1063 session->mgmt_cmds[get_itt(hdr->itt) - 1064 ISCSI_MGMT_ITT_OFFSET]; 1065 1066 if (conn->tmabort_state == TMABORT_INITIAL) { 1067 conn->tmfcmd_pdus_cnt++; 1068 conn->tmabort_timer.expires = 10*HZ + jiffies; 1069 conn->tmabort_timer.function = iscsi_tmabort_timedout; 1070 conn->tmabort_timer.data = (unsigned long)ctask; 1071 add_timer(&conn->tmabort_timer); 1072 debug_scsi("abort set timeout [itt 0x%x]\n", ctask->itt); 1073 } 1074 spin_unlock_bh(&session->lock); 1075 mutex_unlock(&conn->xmitmutex); 1076 1077 /* 1078 * block eh thread until: 1079 * 1080 * 1) abort response 1081 * 2) abort timeout 1082 * 3) session is terminated or restarted or userspace has 1083 * given up on recovery 1084 */ 1085 wait_event_interruptible(conn->ehwait, 1086 sc->SCp.phase != session->age || 1087 session->state != ISCSI_STATE_LOGGED_IN || 1088 conn->tmabort_state != TMABORT_INITIAL); 1089 if (signal_pending(current)) 1090 flush_signals(current); 1091 del_timer_sync(&conn->tmabort_timer); 1092 1093 mutex_lock(&conn->xmitmutex); 1094 return 0; 1095} 1096 1097/* 1098 * xmit mutex and session lock must be held 1099 */ 1100static struct iscsi_mgmt_task * 1101iscsi_remove_mgmt_task(struct kfifo *fifo, uint32_t itt) 1102{ 1103 int i, nr_tasks = __kfifo_len(fifo) / sizeof(void*); 1104 struct iscsi_mgmt_task *task; 1105 1106 debug_scsi("searching %d tasks\n", nr_tasks); 1107 1108 for (i = 0; i < nr_tasks; i++) { 1109 __kfifo_get(fifo, (void*)&task, sizeof(void*)); 1110 debug_scsi("check task %u\n", task->itt); 1111 1112 if (task->itt == itt) { 1113 debug_scsi("matched task\n"); 1114 return task; 1115 } 1116 1117 __kfifo_put(fifo, (void*)&task, sizeof(void*)); 1118 } 1119 return NULL; 1120} 1121 1122static int iscsi_ctask_mtask_cleanup(struct iscsi_cmd_task *ctask) 1123{ 1124 struct iscsi_conn *conn = ctask->conn; 1125 struct iscsi_session *session = conn->session; 1126 1127 if (!ctask->mtask) 1128 return -EINVAL; 1129 1130 if (!iscsi_remove_mgmt_task(conn->immqueue, ctask->mtask->itt)) 1131 list_del(&ctask->mtask->running); 1132 __kfifo_put(session->mgmtpool.queue, (void*)&ctask->mtask, 1133 sizeof(void*)); 1134 ctask->mtask = NULL; 1135 return 0; 1136} 1137 1138/* 1139 * session lock and xmitmutex must be held 1140 */ 1141static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask, 1142 int err) 1143{ 1144 struct scsi_cmnd *sc; 1145 1146 sc = ctask->sc; 1147 if (!sc) 1148 return; 1149 1150 conn->session->tt->cleanup_cmd_task(conn, ctask); 1151 iscsi_ctask_mtask_cleanup(ctask); 1152 1153 sc->result = err; 1154 sc->resid = sc->request_bufflen; 1155 /* release ref from queuecommand */ 1156 __iscsi_put_ctask(ctask); 1157} 1158 1159int iscsi_eh_abort(struct scsi_cmnd *sc) 1160{ 1161 struct iscsi_cmd_task *ctask; 1162 struct iscsi_conn *conn; 1163 struct iscsi_session *session; 1164 int rc; 1165 1166 /* 1167 * if session was ISCSI_STATE_IN_RECOVERY then we may not have 1168 * got the command. 1169 */ 1170 if (!sc->SCp.ptr) { 1171 debug_scsi("sc never reached iscsi layer or it completed.\n"); 1172 return SUCCESS; 1173 } 1174 1175 ctask = (struct iscsi_cmd_task *)sc->SCp.ptr; 1176 conn = ctask->conn; 1177 session = conn->session; 1178 1179 conn->eh_abort_cnt++; 1180 debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt); 1181 1182 mutex_lock(&conn->xmitmutex); 1183 spin_lock_bh(&session->lock); 1184 1185 /* 1186 * If we are not logged in or we have started a new session 1187 * then let the host reset code handle this 1188 */ 1189 if (session->state != ISCSI_STATE_LOGGED_IN || 1190 sc->SCp.phase != session->age) 1191 goto failed; 1192 1193 /* ctask completed before time out */ 1194 if (!ctask->sc) { 1195 spin_unlock_bh(&session->lock); 1196 debug_scsi("sc completed while abort in progress\n"); 1197 goto success_rel_mutex; 1198 } 1199 1200 /* what should we do here ? */ 1201 if (conn->ctask == ctask) { 1202 printk(KERN_INFO "iscsi: sc %p itt 0x%x partially sent. " 1203 "Failing abort\n", sc, ctask->itt); 1204 goto failed; 1205 } 1206 1207 if (ctask->state == ISCSI_TASK_PENDING) 1208 goto success_cleanup; 1209 1210 conn->tmabort_state = TMABORT_INITIAL; 1211 1212 spin_unlock_bh(&session->lock); 1213 rc = iscsi_exec_abort_task(sc, ctask); 1214 spin_lock_bh(&session->lock); 1215 1216 if (rc || sc->SCp.phase != session->age || 1217 session->state != ISCSI_STATE_LOGGED_IN) 1218 goto failed; 1219 iscsi_ctask_mtask_cleanup(ctask); 1220 1221 switch (conn->tmabort_state) { 1222 case TMABORT_SUCCESS: 1223 goto success_cleanup; 1224 case TMABORT_NOT_FOUND: 1225 if (!ctask->sc) { 1226 /* ctask completed before tmf abort response */ 1227 spin_unlock_bh(&session->lock); 1228 debug_scsi("sc completed while abort in progress\n"); 1229 goto success_rel_mutex; 1230 } 1231 /* fall through */ 1232 default: 1233 /* timedout or failed */ 1234 spin_unlock_bh(&session->lock); 1235 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED); 1236 spin_lock_bh(&session->lock); 1237 goto failed; 1238 } 1239 1240success_cleanup: 1241 debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt); 1242 spin_unlock_bh(&session->lock); 1243 1244 /* 1245 * clean up task if aborted. we have the xmitmutex so grab 1246 * the recv lock as a writer 1247 */ 1248 write_lock_bh(conn->recv_lock); 1249 spin_lock(&session->lock); 1250 fail_command(conn, ctask, DID_ABORT << 16); 1251 spin_unlock(&session->lock); 1252 write_unlock_bh(conn->recv_lock); 1253 1254success_rel_mutex: 1255 mutex_unlock(&conn->xmitmutex); 1256 return SUCCESS; 1257 1258failed: 1259 spin_unlock_bh(&session->lock); 1260 mutex_unlock(&conn->xmitmutex); 1261 1262 debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc, ctask->itt); 1263 return FAILED; 1264} 1265EXPORT_SYMBOL_GPL(iscsi_eh_abort); 1266 1267int 1268iscsi_pool_init(struct iscsi_queue *q, int max, void ***items, int item_size) 1269{ 1270 int i; 1271 1272 *items = kmalloc(max * sizeof(void*), GFP_KERNEL); 1273 if (*items == NULL) 1274 return -ENOMEM; 1275 1276 q->max = max; 1277 q->pool = kmalloc(max * sizeof(void*), GFP_KERNEL); 1278 if (q->pool == NULL) { 1279 kfree(*items); 1280 return -ENOMEM; 1281 } 1282 1283 q->queue = kfifo_init((void*)q->pool, max * sizeof(void*), 1284 GFP_KERNEL, NULL); 1285 if (q->queue == ERR_PTR(-ENOMEM)) { 1286 kfree(q->pool); 1287 kfree(*items); 1288 return -ENOMEM; 1289 } 1290 1291 for (i = 0; i < max; i++) { 1292 q->pool[i] = kmalloc(item_size, GFP_KERNEL); 1293 if (q->pool[i] == NULL) { 1294 int j; 1295 1296 for (j = 0; j < i; j++) 1297 kfree(q->pool[j]); 1298 1299 kfifo_free(q->queue); 1300 kfree(q->pool); 1301 kfree(*items); 1302 return -ENOMEM; 1303 } 1304 memset(q->pool[i], 0, item_size); 1305 (*items)[i] = q->pool[i]; 1306 __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*)); 1307 } 1308 return 0; 1309} 1310EXPORT_SYMBOL_GPL(iscsi_pool_init); 1311 1312void iscsi_pool_free(struct iscsi_queue *q, void **items) 1313{ 1314 int i; 1315 1316 for (i = 0; i < q->max; i++) 1317 kfree(items[i]); 1318 kfree(q->pool); 1319 kfree(items); 1320} 1321EXPORT_SYMBOL_GPL(iscsi_pool_free); 1322 1323/* 1324 * iSCSI Session's hostdata organization: 1325 * 1326 * *------------------* <== hostdata_session(host->hostdata) 1327 * | ptr to class sess| 1328 * |------------------| <== iscsi_hostdata(host->hostdata) 1329 * | iscsi_session | 1330 * *------------------* 1331 */ 1332 1333#define hostdata_privsize(_sz) (sizeof(unsigned long) + _sz + \ 1334 _sz % sizeof(unsigned long)) 1335 1336#define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata)) 1337 1338/** 1339 * iscsi_session_setup - create iscsi cls session and host and session 1340 * @scsit: scsi transport template 1341 * @iscsit: iscsi transport template 1342 * @initial_cmdsn: initial CmdSN 1343 * @hostno: host no allocated 1344 * 1345 * This can be used by software iscsi_transports that allocate 1346 * a session per scsi host. 1347 **/ 1348struct iscsi_cls_session * 1349iscsi_session_setup(struct iscsi_transport *iscsit, 1350 struct scsi_transport_template *scsit, 1351 int cmd_task_size, int mgmt_task_size, 1352 uint32_t initial_cmdsn, uint32_t *hostno) 1353{ 1354 struct Scsi_Host *shost; 1355 struct iscsi_session *session; 1356 struct iscsi_cls_session *cls_session; 1357 int cmd_i; 1358 1359 shost = scsi_host_alloc(iscsit->host_template, 1360 hostdata_privsize(sizeof(*session))); 1361 if (!shost) 1362 return NULL; 1363 1364 shost->max_id = 1; 1365 shost->max_channel = 0; 1366 shost->max_lun = iscsit->max_lun; 1367 shost->max_cmd_len = iscsit->max_cmd_len; 1368 shost->transportt = scsit; 1369 shost->transportt->create_work_queue = 1; 1370 *hostno = shost->host_no; 1371 1372 session = iscsi_hostdata(shost->hostdata); 1373 memset(session, 0, sizeof(struct iscsi_session)); 1374 session->host = shost; 1375 session->state = ISCSI_STATE_FREE; 1376 session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX; 1377 session->cmds_max = ISCSI_XMIT_CMDS_MAX; 1378 session->cmdsn = initial_cmdsn; 1379 session->exp_cmdsn = initial_cmdsn + 1; 1380 session->max_cmdsn = initial_cmdsn + 1; 1381 session->max_r2t = 1; 1382 session->tt = iscsit; 1383 1384 /* initialize SCSI PDU commands pool */ 1385 if (iscsi_pool_init(&session->cmdpool, session->cmds_max, 1386 (void***)&session->cmds, 1387 cmd_task_size + sizeof(struct iscsi_cmd_task))) 1388 goto cmdpool_alloc_fail; 1389 1390 /* pre-format cmds pool with ITT */ 1391 for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) { 1392 struct iscsi_cmd_task *ctask = session->cmds[cmd_i]; 1393 1394 if (cmd_task_size) 1395 ctask->dd_data = &ctask[1]; 1396 ctask->itt = cmd_i; 1397 INIT_LIST_HEAD(&ctask->running); 1398 } 1399 1400 spin_lock_init(&session->lock); 1401 1402 /* initialize immediate command pool */ 1403 if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max, 1404 (void***)&session->mgmt_cmds, 1405 mgmt_task_size + sizeof(struct iscsi_mgmt_task))) 1406 goto mgmtpool_alloc_fail; 1407 1408 1409 /* pre-format immediate cmds pool with ITT */ 1410 for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) { 1411 struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i]; 1412 1413 if (mgmt_task_size) 1414 mtask->dd_data = &mtask[1]; 1415 mtask->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i; 1416 INIT_LIST_HEAD(&mtask->running); 1417 } 1418 1419 if (scsi_add_host(shost, NULL)) 1420 goto add_host_fail; 1421 1422 if (!try_module_get(iscsit->owner)) 1423 goto cls_session_fail; 1424 1425 cls_session = iscsi_create_session(shost, iscsit, 0); 1426 if (!cls_session) 1427 goto module_put; 1428 *(unsigned long*)shost->hostdata = (unsigned long)cls_session; 1429 1430 return cls_session; 1431 1432module_put: 1433 module_put(iscsit->owner); 1434cls_session_fail: 1435 scsi_remove_host(shost); 1436add_host_fail: 1437 iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds); 1438mgmtpool_alloc_fail: 1439 iscsi_pool_free(&session->cmdpool, (void**)session->cmds); 1440cmdpool_alloc_fail: 1441 scsi_host_put(shost); 1442 return NULL; 1443} 1444EXPORT_SYMBOL_GPL(iscsi_session_setup); 1445 1446/** 1447 * iscsi_session_teardown - destroy session, host, and cls_session 1448 * shost: scsi host 1449 * 1450 * This can be used by software iscsi_transports that allocate 1451 * a session per scsi host. 1452 **/ 1453void iscsi_session_teardown(struct iscsi_cls_session *cls_session) 1454{ 1455 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); 1456 struct iscsi_session *session = iscsi_hostdata(shost->hostdata); 1457 struct module *owner = cls_session->transport->owner; 1458 1459 scsi_remove_host(shost); 1460 1461 iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds); 1462 iscsi_pool_free(&session->cmdpool, (void**)session->cmds); 1463 1464 kfree(session->targetname); 1465 1466 iscsi_destroy_session(cls_session); 1467 scsi_host_put(shost); 1468 module_put(owner); 1469} 1470EXPORT_SYMBOL_GPL(iscsi_session_teardown); 1471 1472/** 1473 * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn 1474 * @cls_session: iscsi_cls_session 1475 * @conn_idx: cid 1476 **/ 1477struct iscsi_cls_conn * 1478iscsi_conn_setup(struct iscsi_cls_session *cls_session, uint32_t conn_idx) 1479{ 1480 struct iscsi_session *session = class_to_transport_session(cls_session); 1481 struct iscsi_conn *conn; 1482 struct iscsi_cls_conn *cls_conn; 1483 char *data; 1484 1485 cls_conn = iscsi_create_conn(cls_session, conn_idx); 1486 if (!cls_conn) 1487 return NULL; 1488 conn = cls_conn->dd_data; 1489 memset(conn, 0, sizeof(*conn)); 1490 1491 conn->session = session; 1492 conn->cls_conn = cls_conn; 1493 conn->c_stage = ISCSI_CONN_INITIAL_STAGE; 1494 conn->id = conn_idx; 1495 conn->exp_statsn = 0; 1496 conn->tmabort_state = TMABORT_INITIAL; 1497 INIT_LIST_HEAD(&conn->run_list); 1498 INIT_LIST_HEAD(&conn->mgmt_run_list); 1499 INIT_LIST_HEAD(&conn->xmitqueue); 1500 1501 /* initialize general immediate & non-immediate PDU commands queue */ 1502 conn->immqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*), 1503 GFP_KERNEL, NULL); 1504 if (conn->immqueue == ERR_PTR(-ENOMEM)) 1505 goto immqueue_alloc_fail; 1506 1507 conn->mgmtqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*), 1508 GFP_KERNEL, NULL); 1509 if (conn->mgmtqueue == ERR_PTR(-ENOMEM)) 1510 goto mgmtqueue_alloc_fail; 1511 1512 INIT_WORK(&conn->xmitwork, iscsi_xmitworker); 1513 1514 /* allocate login_mtask used for the login/text sequences */ 1515 spin_lock_bh(&session->lock); 1516 if (!__kfifo_get(session->mgmtpool.queue, 1517 (void*)&conn->login_mtask, 1518 sizeof(void*))) { 1519 spin_unlock_bh(&session->lock); 1520 goto login_mtask_alloc_fail; 1521 } 1522 spin_unlock_bh(&session->lock); 1523 1524 data = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL); 1525 if (!data) 1526 goto login_mtask_data_alloc_fail; 1527 conn->login_mtask->data = conn->data = data; 1528 1529 init_timer(&conn->tmabort_timer); 1530 mutex_init(&conn->xmitmutex); 1531 init_waitqueue_head(&conn->ehwait); 1532 1533 return cls_conn; 1534 1535login_mtask_data_alloc_fail: 1536 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask, 1537 sizeof(void*)); 1538login_mtask_alloc_fail: 1539 kfifo_free(conn->mgmtqueue); 1540mgmtqueue_alloc_fail: 1541 kfifo_free(conn->immqueue); 1542immqueue_alloc_fail: 1543 iscsi_destroy_conn(cls_conn); 1544 return NULL; 1545} 1546EXPORT_SYMBOL_GPL(iscsi_conn_setup); 1547 1548/** 1549 * iscsi_conn_teardown - teardown iscsi connection 1550 * cls_conn: iscsi class connection 1551 * 1552 * TODO: we may need to make this into a two step process 1553 * like scsi-mls remove + put host 1554 */ 1555void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn) 1556{ 1557 struct iscsi_conn *conn = cls_conn->dd_data; 1558 struct iscsi_session *session = conn->session; 1559 unsigned long flags; 1560 1561 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); 1562 mutex_lock(&conn->xmitmutex); 1563 1564 spin_lock_bh(&session->lock); 1565 conn->c_stage = ISCSI_CONN_CLEANUP_WAIT; 1566 if (session->leadconn == conn) { 1567 /* 1568 * leading connection? then give up on recovery. 1569 */ 1570 session->state = ISCSI_STATE_TERMINATE; 1571 wake_up(&conn->ehwait); 1572 } 1573 spin_unlock_bh(&session->lock); 1574 1575 mutex_unlock(&conn->xmitmutex); 1576 1577 /* 1578 * Block until all in-progress commands for this connection 1579 * time out or fail. 1580 */ 1581 for (;;) { 1582 spin_lock_irqsave(session->host->host_lock, flags); 1583 if (!session->host->host_busy) { /* OK for ERL == 0 */ 1584 spin_unlock_irqrestore(session->host->host_lock, flags); 1585 break; 1586 } 1587 spin_unlock_irqrestore(session->host->host_lock, flags); 1588 msleep_interruptible(500); 1589 printk(KERN_INFO "iscsi: scsi conn_destroy(): host_busy %d " 1590 "host_failed %d\n", session->host->host_busy, 1591 session->host->host_failed); 1592 /* 1593 * force eh_abort() to unblock 1594 */ 1595 wake_up(&conn->ehwait); 1596 } 1597 1598 /* flush queued up work because we free the connection below */ 1599 scsi_flush_work(session->host); 1600 1601 spin_lock_bh(&session->lock); 1602 kfree(conn->data); 1603 kfree(conn->persistent_address); 1604 __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask, 1605 sizeof(void*)); 1606 if (session->leadconn == conn) { 1607 session->leadconn = NULL; 1608 /* no connections exits.. reset sequencing */ 1609 session->cmdsn = session->max_cmdsn = session->exp_cmdsn = 1; 1610 } 1611 spin_unlock_bh(&session->lock); 1612 1613 kfifo_free(conn->immqueue); 1614 kfifo_free(conn->mgmtqueue); 1615 1616 iscsi_destroy_conn(cls_conn); 1617} 1618EXPORT_SYMBOL_GPL(iscsi_conn_teardown); 1619 1620int iscsi_conn_start(struct iscsi_cls_conn *cls_conn) 1621{ 1622 struct iscsi_conn *conn = cls_conn->dd_data; 1623 struct iscsi_session *session = conn->session; 1624 1625 if (!session) { 1626 printk(KERN_ERR "iscsi: can't start unbound connection\n"); 1627 return -EPERM; 1628 } 1629 1630 if ((session->imm_data_en || !session->initial_r2t_en) && 1631 session->first_burst > session->max_burst) { 1632 printk("iscsi: invalid burst lengths: " 1633 "first_burst %d max_burst %d\n", 1634 session->first_burst, session->max_burst); 1635 return -EINVAL; 1636 } 1637 1638 spin_lock_bh(&session->lock); 1639 conn->c_stage = ISCSI_CONN_STARTED; 1640 session->state = ISCSI_STATE_LOGGED_IN; 1641 1642 switch(conn->stop_stage) { 1643 case STOP_CONN_RECOVER: 1644 /* 1645 * unblock eh_abort() if it is blocked. re-try all 1646 * commands after successful recovery 1647 */ 1648 conn->stop_stage = 0; 1649 conn->tmabort_state = TMABORT_INITIAL; 1650 session->age++; 1651 spin_unlock_bh(&session->lock); 1652 1653 iscsi_unblock_session(session_to_cls(session)); 1654 wake_up(&conn->ehwait); 1655 return 0; 1656 case STOP_CONN_TERM: 1657 conn->stop_stage = 0; 1658 break; 1659 default: 1660 break; 1661 } 1662 spin_unlock_bh(&session->lock); 1663 1664 return 0; 1665} 1666EXPORT_SYMBOL_GPL(iscsi_conn_start); 1667 1668static void 1669flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn) 1670{ 1671 struct iscsi_mgmt_task *mtask, *tmp; 1672 1673 /* handle pending */ 1674 while (__kfifo_get(conn->immqueue, (void*)&mtask, sizeof(void*)) || 1675 __kfifo_get(conn->mgmtqueue, (void*)&mtask, sizeof(void*))) { 1676 if (mtask == conn->login_mtask) 1677 continue; 1678 debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask->itt); 1679 __kfifo_put(session->mgmtpool.queue, (void*)&mtask, 1680 sizeof(void*)); 1681 } 1682 1683 /* handle running */ 1684 list_for_each_entry_safe(mtask, tmp, &conn->mgmt_run_list, running) { 1685 debug_scsi("flushing running mgmt task itt 0x%x\n", mtask->itt); 1686 list_del(&mtask->running); 1687 1688 if (mtask == conn->login_mtask) 1689 continue; 1690 __kfifo_put(session->mgmtpool.queue, (void*)&mtask, 1691 sizeof(void*)); 1692 } 1693 1694 conn->mtask = NULL; 1695} 1696 1697/* Fail commands. Mutex and session lock held and recv side suspended */ 1698static void fail_all_commands(struct iscsi_conn *conn) 1699{ 1700 struct iscsi_cmd_task *ctask, *tmp; 1701 1702 /* flush pending */ 1703 list_for_each_entry_safe(ctask, tmp, &conn->xmitqueue, running) { 1704 debug_scsi("failing pending sc %p itt 0x%x\n", ctask->sc, 1705 ctask->itt); 1706 fail_command(conn, ctask, DID_BUS_BUSY << 16); 1707 } 1708 1709 /* fail all other running */ 1710 list_for_each_entry_safe(ctask, tmp, &conn->run_list, running) { 1711 debug_scsi("failing in progress sc %p itt 0x%x\n", 1712 ctask->sc, ctask->itt); 1713 fail_command(conn, ctask, DID_BUS_BUSY << 16); 1714 } 1715 1716 conn->ctask = NULL; 1717} 1718 1719static void iscsi_start_session_recovery(struct iscsi_session *session, 1720 struct iscsi_conn *conn, int flag) 1721{ 1722 int old_stop_stage; 1723 1724 spin_lock_bh(&session->lock); 1725 if (conn->stop_stage == STOP_CONN_TERM) { 1726 spin_unlock_bh(&session->lock); 1727 return; 1728 } 1729 1730 /* 1731 * When this is called for the in_login state, we only want to clean 1732 * up the login task and connection. We do not need to block and set 1733 * the recovery state again 1734 */ 1735 if (flag == STOP_CONN_TERM) 1736 session->state = ISCSI_STATE_TERMINATE; 1737 else if (conn->stop_stage != STOP_CONN_RECOVER) 1738 session->state = ISCSI_STATE_IN_RECOVERY; 1739 1740 old_stop_stage = conn->stop_stage; 1741 conn->stop_stage = flag; 1742 conn->c_stage = ISCSI_CONN_STOPPED; 1743 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); 1744 spin_unlock_bh(&session->lock); 1745 1746 write_lock_bh(conn->recv_lock); 1747 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); 1748 write_unlock_bh(conn->recv_lock); 1749 1750 mutex_lock(&conn->xmitmutex); 1751 /* 1752 * for connection level recovery we should not calculate 1753 * header digest. conn->hdr_size used for optimization 1754 * in hdr_extract() and will be re-negotiated at 1755 * set_param() time. 1756 */ 1757 if (flag == STOP_CONN_RECOVER) { 1758 conn->hdrdgst_en = 0; 1759 conn->datadgst_en = 0; 1760 if (session->state == ISCSI_STATE_IN_RECOVERY && 1761 old_stop_stage != STOP_CONN_RECOVER) { 1762 debug_scsi("blocking session\n"); 1763 iscsi_block_session(session_to_cls(session)); 1764 } 1765 } 1766 1767 /* 1768 * flush queues. 1769 */ 1770 spin_lock_bh(&session->lock); 1771 fail_all_commands(conn); 1772 flush_control_queues(session, conn); 1773 spin_unlock_bh(&session->lock); 1774 1775 mutex_unlock(&conn->xmitmutex); 1776} 1777 1778void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag) 1779{ 1780 struct iscsi_conn *conn = cls_conn->dd_data; 1781 struct iscsi_session *session = conn->session; 1782 1783 switch (flag) { 1784 case STOP_CONN_RECOVER: 1785 case STOP_CONN_TERM: 1786 iscsi_start_session_recovery(session, conn, flag); 1787 break; 1788 default: 1789 printk(KERN_ERR "iscsi: invalid stop flag %d\n", flag); 1790 } 1791} 1792EXPORT_SYMBOL_GPL(iscsi_conn_stop); 1793 1794int iscsi_conn_bind(struct iscsi_cls_session *cls_session, 1795 struct iscsi_cls_conn *cls_conn, int is_leading) 1796{ 1797 struct iscsi_session *session = class_to_transport_session(cls_session); 1798 struct iscsi_conn *conn = cls_conn->dd_data; 1799 1800 spin_lock_bh(&session->lock); 1801 if (is_leading) 1802 session->leadconn = conn; 1803 spin_unlock_bh(&session->lock); 1804 1805 /* 1806 * Unblock xmitworker(), Login Phase will pass through. 1807 */ 1808 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx); 1809 clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx); 1810 return 0; 1811} 1812EXPORT_SYMBOL_GPL(iscsi_conn_bind); 1813 1814 1815int iscsi_set_param(struct iscsi_cls_conn *cls_conn, 1816 enum iscsi_param param, char *buf, int buflen) 1817{ 1818 struct iscsi_conn *conn = cls_conn->dd_data; 1819 struct iscsi_session *session = conn->session; 1820 uint32_t value; 1821 1822 switch(param) { 1823 case ISCSI_PARAM_MAX_RECV_DLENGTH: 1824 sscanf(buf, "%d", &conn->max_recv_dlength); 1825 break; 1826 case ISCSI_PARAM_MAX_XMIT_DLENGTH: 1827 sscanf(buf, "%d", &conn->max_xmit_dlength); 1828 break; 1829 case ISCSI_PARAM_HDRDGST_EN: 1830 sscanf(buf, "%d", &conn->hdrdgst_en); 1831 break; 1832 case ISCSI_PARAM_DATADGST_EN: 1833 sscanf(buf, "%d", &conn->datadgst_en); 1834 break; 1835 case ISCSI_PARAM_INITIAL_R2T_EN: 1836 sscanf(buf, "%d", &session->initial_r2t_en); 1837 break; 1838 case ISCSI_PARAM_MAX_R2T: 1839 sscanf(buf, "%d", &session->max_r2t); 1840 break; 1841 case ISCSI_PARAM_IMM_DATA_EN: 1842 sscanf(buf, "%d", &session->imm_data_en); 1843 break; 1844 case ISCSI_PARAM_FIRST_BURST: 1845 sscanf(buf, "%d", &session->first_burst); 1846 break; 1847 case ISCSI_PARAM_MAX_BURST: 1848 sscanf(buf, "%d", &session->max_burst); 1849 break; 1850 case ISCSI_PARAM_PDU_INORDER_EN: 1851 sscanf(buf, "%d", &session->pdu_inorder_en); 1852 break; 1853 case ISCSI_PARAM_DATASEQ_INORDER_EN: 1854 sscanf(buf, "%d", &session->dataseq_inorder_en); 1855 break; 1856 case ISCSI_PARAM_ERL: 1857 sscanf(buf, "%d", &session->erl); 1858 break; 1859 case ISCSI_PARAM_IFMARKER_EN: 1860 sscanf(buf, "%d", &value); 1861 BUG_ON(value); 1862 break; 1863 case ISCSI_PARAM_OFMARKER_EN: 1864 sscanf(buf, "%d", &value); 1865 BUG_ON(value); 1866 break; 1867 case ISCSI_PARAM_EXP_STATSN: 1868 sscanf(buf, "%u", &conn->exp_statsn); 1869 break; 1870 case ISCSI_PARAM_TARGET_NAME: 1871 /* this should not change between logins */ 1872 if (session->targetname) 1873 break; 1874 1875 session->targetname = kstrdup(buf, GFP_KERNEL); 1876 if (!session->targetname) 1877 return -ENOMEM; 1878 break; 1879 case ISCSI_PARAM_TPGT: 1880 sscanf(buf, "%d", &session->tpgt); 1881 break; 1882 case ISCSI_PARAM_PERSISTENT_PORT: 1883 sscanf(buf, "%d", &conn->persistent_port); 1884 break; 1885 case ISCSI_PARAM_PERSISTENT_ADDRESS: 1886 /* 1887 * this is the address returned in discovery so it should 1888 * not change between logins. 1889 */ 1890 if (conn->persistent_address) 1891 break; 1892 1893 conn->persistent_address = kstrdup(buf, GFP_KERNEL); 1894 if (!conn->persistent_address) 1895 return -ENOMEM; 1896 break; 1897 default: 1898 return -ENOSYS; 1899 } 1900 1901 return 0; 1902} 1903EXPORT_SYMBOL_GPL(iscsi_set_param); 1904 1905int iscsi_session_get_param(struct iscsi_cls_session *cls_session, 1906 enum iscsi_param param, char *buf) 1907{ 1908 struct Scsi_Host *shost = iscsi_session_to_shost(cls_session); 1909 struct iscsi_session *session = iscsi_hostdata(shost->hostdata); 1910 int len; 1911 1912 switch(param) { 1913 case ISCSI_PARAM_INITIAL_R2T_EN: 1914 len = sprintf(buf, "%d\n", session->initial_r2t_en); 1915 break; 1916 case ISCSI_PARAM_MAX_R2T: 1917 len = sprintf(buf, "%hu\n", session->max_r2t); 1918 break; 1919 case ISCSI_PARAM_IMM_DATA_EN: 1920 len = sprintf(buf, "%d\n", session->imm_data_en); 1921 break; 1922 case ISCSI_PARAM_FIRST_BURST: 1923 len = sprintf(buf, "%u\n", session->first_burst); 1924 break; 1925 case ISCSI_PARAM_MAX_BURST: 1926 len = sprintf(buf, "%u\n", session->max_burst); 1927 break; 1928 case ISCSI_PARAM_PDU_INORDER_EN: 1929 len = sprintf(buf, "%d\n", session->pdu_inorder_en); 1930 break; 1931 case ISCSI_PARAM_DATASEQ_INORDER_EN: 1932 len = sprintf(buf, "%d\n", session->dataseq_inorder_en); 1933 break; 1934 case ISCSI_PARAM_ERL: 1935 len = sprintf(buf, "%d\n", session->erl); 1936 break; 1937 case ISCSI_PARAM_TARGET_NAME: 1938 len = sprintf(buf, "%s\n", session->targetname); 1939 break; 1940 case ISCSI_PARAM_TPGT: 1941 len = sprintf(buf, "%d\n", session->tpgt); 1942 break; 1943 default: 1944 return -ENOSYS; 1945 } 1946 1947 return len; 1948} 1949EXPORT_SYMBOL_GPL(iscsi_session_get_param); 1950 1951int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, 1952 enum iscsi_param param, char *buf) 1953{ 1954 struct iscsi_conn *conn = cls_conn->dd_data; 1955 int len; 1956 1957 switch(param) { 1958 case ISCSI_PARAM_MAX_RECV_DLENGTH: 1959 len = sprintf(buf, "%u\n", conn->max_recv_dlength); 1960 break; 1961 case ISCSI_PARAM_MAX_XMIT_DLENGTH: 1962 len = sprintf(buf, "%u\n", conn->max_xmit_dlength); 1963 break; 1964 case ISCSI_PARAM_HDRDGST_EN: 1965 len = sprintf(buf, "%d\n", conn->hdrdgst_en); 1966 break; 1967 case ISCSI_PARAM_DATADGST_EN: 1968 len = sprintf(buf, "%d\n", conn->datadgst_en); 1969 break; 1970 case ISCSI_PARAM_IFMARKER_EN: 1971 len = sprintf(buf, "%d\n", conn->ifmarker_en); 1972 break; 1973 case ISCSI_PARAM_OFMARKER_EN: 1974 len = sprintf(buf, "%d\n", conn->ofmarker_en); 1975 break; 1976 case ISCSI_PARAM_EXP_STATSN: 1977 len = sprintf(buf, "%u\n", conn->exp_statsn); 1978 break; 1979 case ISCSI_PARAM_PERSISTENT_PORT: 1980 len = sprintf(buf, "%d\n", conn->persistent_port); 1981 break; 1982 case ISCSI_PARAM_PERSISTENT_ADDRESS: 1983 len = sprintf(buf, "%s\n", conn->persistent_address); 1984 break; 1985 default: 1986 return -ENOSYS; 1987 } 1988 1989 return len; 1990} 1991EXPORT_SYMBOL_GPL(iscsi_conn_get_param); 1992 1993MODULE_AUTHOR("Mike Christie"); 1994MODULE_DESCRIPTION("iSCSI library functions"); 1995MODULE_LICENSE("GPL"); 1996