1 /******************************************************************************* 2 * This file contains error recovery level one used by the iSCSI Target driver. 3 * 4 * (c) Copyright 2007-2013 Datera, Inc. 5 * 6 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 ******************************************************************************/ 18 19 #include <linux/list.h> 20 #include <scsi/iscsi_proto.h> 21 #include <target/target_core_base.h> 22 #include <target/target_core_fabric.h> 23 #include <target/iscsi/iscsi_transport.h> 24 25 #include "iscsi_target_core.h" 26 #include "iscsi_target_seq_pdu_list.h" 27 #include "iscsi_target_datain_values.h" 28 #include "iscsi_target_device.h" 29 #include "iscsi_target_tpg.h" 30 #include "iscsi_target_util.h" 31 #include "iscsi_target_erl0.h" 32 #include "iscsi_target_erl1.h" 33 #include "iscsi_target_erl2.h" 34 #include "iscsi_target.h" 35 36 #define OFFLOAD_BUF_SIZE 32768 37 38 /* 39 * Used to dump excess datain payload for certain error recovery 40 * situations. Receive in OFFLOAD_BUF_SIZE max of datain per rx_data(). 41 * 42 * dump_padding_digest denotes if padding and data digests need 43 * to be dumped. 44 */ 45 int iscsit_dump_data_payload( 46 struct iscsi_conn *conn, 47 u32 buf_len, 48 int dump_padding_digest) 49 { 50 char *buf, pad_bytes[4]; 51 int ret = DATAOUT_WITHIN_COMMAND_RECOVERY, rx_got; 52 u32 length, padding, offset = 0, size; 53 struct kvec iov; 54 55 if (conn->sess->sess_ops->RDMAExtensions) 56 return 0; 57 58 length = (buf_len > OFFLOAD_BUF_SIZE) ? OFFLOAD_BUF_SIZE : buf_len; 59 60 buf = kzalloc(length, GFP_ATOMIC); 61 if (!buf) { 62 pr_err("Unable to allocate %u bytes for offload" 63 " buffer.\n", length); 64 return -1; 65 } 66 memset(&iov, 0, sizeof(struct kvec)); 67 68 while (offset < buf_len) { 69 size = ((offset + length) > buf_len) ? 70 (buf_len - offset) : length; 71 72 iov.iov_len = size; 73 iov.iov_base = buf; 74 75 rx_got = rx_data(conn, &iov, 1, size); 76 if (rx_got != size) { 77 ret = DATAOUT_CANNOT_RECOVER; 78 goto out; 79 } 80 81 offset += size; 82 } 83 84 if (!dump_padding_digest) 85 goto out; 86 87 padding = ((-buf_len) & 3); 88 if (padding != 0) { 89 iov.iov_len = padding; 90 iov.iov_base = pad_bytes; 91 92 rx_got = rx_data(conn, &iov, 1, padding); 93 if (rx_got != padding) { 94 ret = DATAOUT_CANNOT_RECOVER; 95 goto out; 96 } 97 } 98 99 if (conn->conn_ops->DataDigest) { 100 u32 data_crc; 101 102 iov.iov_len = ISCSI_CRC_LEN; 103 iov.iov_base = &data_crc; 104 105 rx_got = rx_data(conn, &iov, 1, ISCSI_CRC_LEN); 106 if (rx_got != ISCSI_CRC_LEN) { 107 ret = DATAOUT_CANNOT_RECOVER; 108 goto out; 109 } 110 } 111 112 out: 113 kfree(buf); 114 return ret; 115 } 116 117 /* 118 * Used for retransmitting R2Ts from a R2T SNACK request. 119 */ 120 static int iscsit_send_recovery_r2t_for_snack( 121 struct iscsi_cmd *cmd, 122 struct iscsi_r2t *r2t) 123 { 124 /* 125 * If the struct iscsi_r2t has not been sent yet, we can safely 126 * ignore retransmission 127 * of the R2TSN in question. 128 */ 129 spin_lock_bh(&cmd->r2t_lock); 130 if (!r2t->sent_r2t) { 131 spin_unlock_bh(&cmd->r2t_lock); 132 return 0; 133 } 134 r2t->sent_r2t = 0; 135 spin_unlock_bh(&cmd->r2t_lock); 136 137 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, ISTATE_SEND_R2T); 138 139 return 0; 140 } 141 142 static int iscsit_handle_r2t_snack( 143 struct iscsi_cmd *cmd, 144 unsigned char *buf, 145 u32 begrun, 146 u32 runlength) 147 { 148 u32 last_r2tsn; 149 struct iscsi_r2t *r2t; 150 151 /* 152 * Make sure the initiator is not requesting retransmission 153 * of R2TSNs already acknowledged by a TMR TASK_REASSIGN. 154 */ 155 if ((cmd->cmd_flags & ICF_GOT_DATACK_SNACK) && 156 (begrun <= cmd->acked_data_sn)) { 157 pr_err("ITT: 0x%08x, R2T SNACK requesting" 158 " retransmission of R2TSN: 0x%08x to 0x%08x but already" 159 " acked to R2TSN: 0x%08x by TMR TASK_REASSIGN," 160 " protocol error.\n", cmd->init_task_tag, begrun, 161 (begrun + runlength), cmd->acked_data_sn); 162 163 return iscsit_reject_cmd(cmd, 164 ISCSI_REASON_PROTOCOL_ERROR, buf); 165 } 166 167 if (runlength) { 168 if ((begrun + runlength) > cmd->r2t_sn) { 169 pr_err("Command ITT: 0x%08x received R2T SNACK" 170 " with BegRun: 0x%08x, RunLength: 0x%08x, exceeds" 171 " current R2TSN: 0x%08x, protocol error.\n", 172 cmd->init_task_tag, begrun, runlength, cmd->r2t_sn); 173 return iscsit_reject_cmd(cmd, 174 ISCSI_REASON_BOOKMARK_INVALID, buf); 175 } 176 last_r2tsn = (begrun + runlength); 177 } else 178 last_r2tsn = cmd->r2t_sn; 179 180 while (begrun < last_r2tsn) { 181 r2t = iscsit_get_holder_for_r2tsn(cmd, begrun); 182 if (!r2t) 183 return -1; 184 if (iscsit_send_recovery_r2t_for_snack(cmd, r2t) < 0) 185 return -1; 186 187 begrun++; 188 } 189 190 return 0; 191 } 192 193 /* 194 * Generates Offsets and NextBurstLength based on Begrun and Runlength 195 * carried in a Data SNACK or ExpDataSN in TMR TASK_REASSIGN. 196 * 197 * For DataSequenceInOrder=Yes and DataPDUInOrder=[Yes,No] only. 198 * 199 * FIXME: How is this handled for a RData SNACK? 200 */ 201 int iscsit_create_recovery_datain_values_datasequenceinorder_yes( 202 struct iscsi_cmd *cmd, 203 struct iscsi_datain_req *dr) 204 { 205 u32 data_sn = 0, data_sn_count = 0; 206 u32 pdu_start = 0, seq_no = 0; 207 u32 begrun = dr->begrun; 208 struct iscsi_conn *conn = cmd->conn; 209 210 while (begrun > data_sn++) { 211 data_sn_count++; 212 if ((dr->next_burst_len + 213 conn->conn_ops->MaxRecvDataSegmentLength) < 214 conn->sess->sess_ops->MaxBurstLength) { 215 dr->read_data_done += 216 conn->conn_ops->MaxRecvDataSegmentLength; 217 dr->next_burst_len += 218 conn->conn_ops->MaxRecvDataSegmentLength; 219 } else { 220 dr->read_data_done += 221 (conn->sess->sess_ops->MaxBurstLength - 222 dr->next_burst_len); 223 dr->next_burst_len = 0; 224 pdu_start += data_sn_count; 225 data_sn_count = 0; 226 seq_no++; 227 } 228 } 229 230 if (!conn->sess->sess_ops->DataPDUInOrder) { 231 cmd->seq_no = seq_no; 232 cmd->pdu_start = pdu_start; 233 cmd->pdu_send_order = data_sn_count; 234 } 235 236 return 0; 237 } 238 239 /* 240 * Generates Offsets and NextBurstLength based on Begrun and Runlength 241 * carried in a Data SNACK or ExpDataSN in TMR TASK_REASSIGN. 242 * 243 * For DataSequenceInOrder=No and DataPDUInOrder=[Yes,No] only. 244 * 245 * FIXME: How is this handled for a RData SNACK? 246 */ 247 int iscsit_create_recovery_datain_values_datasequenceinorder_no( 248 struct iscsi_cmd *cmd, 249 struct iscsi_datain_req *dr) 250 { 251 int found_seq = 0, i; 252 u32 data_sn, read_data_done = 0, seq_send_order = 0; 253 u32 begrun = dr->begrun; 254 u32 runlength = dr->runlength; 255 struct iscsi_conn *conn = cmd->conn; 256 struct iscsi_seq *first_seq = NULL, *seq = NULL; 257 258 if (!cmd->seq_list) { 259 pr_err("struct iscsi_cmd->seq_list is NULL!\n"); 260 return -1; 261 } 262 263 /* 264 * Calculate read_data_done for all sequences containing a 265 * first_datasn and last_datasn less than the BegRun. 266 * 267 * Locate the struct iscsi_seq the BegRun lies within and calculate 268 * NextBurstLenghth up to the DataSN based on MaxRecvDataSegmentLength. 269 * 270 * Also use struct iscsi_seq->seq_send_order to determine where to start. 271 */ 272 for (i = 0; i < cmd->seq_count; i++) { 273 seq = &cmd->seq_list[i]; 274 275 if (!seq->seq_send_order) 276 first_seq = seq; 277 278 /* 279 * No data has been transferred for this DataIN sequence, so the 280 * seq->first_datasn and seq->last_datasn have not been set. 281 */ 282 if (!seq->sent) { 283 pr_err("Ignoring non-sent sequence 0x%08x ->" 284 " 0x%08x\n\n", seq->first_datasn, 285 seq->last_datasn); 286 continue; 287 } 288 289 /* 290 * This DataIN sequence is precedes the received BegRun, add the 291 * total xfer_len of the sequence to read_data_done and reset 292 * seq->pdu_send_order. 293 */ 294 if ((seq->first_datasn < begrun) && 295 (seq->last_datasn < begrun)) { 296 pr_err("Pre BegRun sequence 0x%08x ->" 297 " 0x%08x\n", seq->first_datasn, 298 seq->last_datasn); 299 300 read_data_done += cmd->seq_list[i].xfer_len; 301 seq->next_burst_len = seq->pdu_send_order = 0; 302 continue; 303 } 304 305 /* 306 * The BegRun lies within this DataIN sequence. 307 */ 308 if ((seq->first_datasn <= begrun) && 309 (seq->last_datasn >= begrun)) { 310 pr_err("Found sequence begrun: 0x%08x in" 311 " 0x%08x -> 0x%08x\n", begrun, 312 seq->first_datasn, seq->last_datasn); 313 314 seq_send_order = seq->seq_send_order; 315 data_sn = seq->first_datasn; 316 seq->next_burst_len = seq->pdu_send_order = 0; 317 found_seq = 1; 318 319 /* 320 * For DataPDUInOrder=Yes, while the first DataSN of 321 * the sequence is less than the received BegRun, add 322 * the MaxRecvDataSegmentLength to read_data_done and 323 * to the sequence's next_burst_len; 324 * 325 * For DataPDUInOrder=No, while the first DataSN of the 326 * sequence is less than the received BegRun, find the 327 * struct iscsi_pdu of the DataSN in question and add the 328 * MaxRecvDataSegmentLength to read_data_done and to the 329 * sequence's next_burst_len; 330 */ 331 if (conn->sess->sess_ops->DataPDUInOrder) { 332 while (data_sn < begrun) { 333 seq->pdu_send_order++; 334 read_data_done += 335 conn->conn_ops->MaxRecvDataSegmentLength; 336 seq->next_burst_len += 337 conn->conn_ops->MaxRecvDataSegmentLength; 338 data_sn++; 339 } 340 } else { 341 int j; 342 struct iscsi_pdu *pdu; 343 344 while (data_sn < begrun) { 345 seq->pdu_send_order++; 346 347 for (j = 0; j < seq->pdu_count; j++) { 348 pdu = &cmd->pdu_list[ 349 seq->pdu_start + j]; 350 if (pdu->data_sn == data_sn) { 351 read_data_done += 352 pdu->length; 353 seq->next_burst_len += 354 pdu->length; 355 } 356 } 357 data_sn++; 358 } 359 } 360 continue; 361 } 362 363 /* 364 * This DataIN sequence is larger than the received BegRun, 365 * reset seq->pdu_send_order and continue. 366 */ 367 if ((seq->first_datasn > begrun) || 368 (seq->last_datasn > begrun)) { 369 pr_err("Post BegRun sequence 0x%08x -> 0x%08x\n", 370 seq->first_datasn, seq->last_datasn); 371 372 seq->next_burst_len = seq->pdu_send_order = 0; 373 continue; 374 } 375 } 376 377 if (!found_seq) { 378 if (!begrun) { 379 if (!first_seq) { 380 pr_err("ITT: 0x%08x, Begrun: 0x%08x" 381 " but first_seq is NULL\n", 382 cmd->init_task_tag, begrun); 383 return -1; 384 } 385 seq_send_order = first_seq->seq_send_order; 386 seq->next_burst_len = seq->pdu_send_order = 0; 387 goto done; 388 } 389 390 pr_err("Unable to locate struct iscsi_seq for ITT: 0x%08x," 391 " BegRun: 0x%08x, RunLength: 0x%08x while" 392 " DataSequenceInOrder=No and DataPDUInOrder=%s.\n", 393 cmd->init_task_tag, begrun, runlength, 394 (conn->sess->sess_ops->DataPDUInOrder) ? "Yes" : "No"); 395 return -1; 396 } 397 398 done: 399 dr->read_data_done = read_data_done; 400 dr->seq_send_order = seq_send_order; 401 402 return 0; 403 } 404 405 static int iscsit_handle_recovery_datain( 406 struct iscsi_cmd *cmd, 407 unsigned char *buf, 408 u32 begrun, 409 u32 runlength) 410 { 411 struct iscsi_conn *conn = cmd->conn; 412 struct iscsi_datain_req *dr; 413 struct se_cmd *se_cmd = &cmd->se_cmd; 414 415 if (!(se_cmd->transport_state & CMD_T_COMPLETE)) { 416 pr_err("Ignoring ITT: 0x%08x Data SNACK\n", 417 cmd->init_task_tag); 418 return 0; 419 } 420 421 /* 422 * Make sure the initiator is not requesting retransmission 423 * of DataSNs already acknowledged by a Data ACK SNACK. 424 */ 425 if ((cmd->cmd_flags & ICF_GOT_DATACK_SNACK) && 426 (begrun <= cmd->acked_data_sn)) { 427 pr_err("ITT: 0x%08x, Data SNACK requesting" 428 " retransmission of DataSN: 0x%08x to 0x%08x but" 429 " already acked to DataSN: 0x%08x by Data ACK SNACK," 430 " protocol error.\n", cmd->init_task_tag, begrun, 431 (begrun + runlength), cmd->acked_data_sn); 432 433 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf); 434 } 435 436 /* 437 * Make sure BegRun and RunLength in the Data SNACK are sane. 438 * Note: (cmd->data_sn - 1) will carry the maximum DataSN sent. 439 */ 440 if ((begrun + runlength) > (cmd->data_sn - 1)) { 441 pr_err("Initiator requesting BegRun: 0x%08x, RunLength" 442 ": 0x%08x greater than maximum DataSN: 0x%08x.\n", 443 begrun, runlength, (cmd->data_sn - 1)); 444 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, 445 buf); 446 } 447 448 dr = iscsit_allocate_datain_req(); 449 if (!dr) 450 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_NO_RESOURCES, 451 buf); 452 453 dr->data_sn = dr->begrun = begrun; 454 dr->runlength = runlength; 455 dr->generate_recovery_values = 1; 456 dr->recovery = DATAIN_WITHIN_COMMAND_RECOVERY; 457 458 iscsit_attach_datain_req(cmd, dr); 459 460 cmd->i_state = ISTATE_SEND_DATAIN; 461 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 462 463 return 0; 464 } 465 466 int iscsit_handle_recovery_datain_or_r2t( 467 struct iscsi_conn *conn, 468 unsigned char *buf, 469 itt_t init_task_tag, 470 u32 targ_xfer_tag, 471 u32 begrun, 472 u32 runlength) 473 { 474 struct iscsi_cmd *cmd; 475 476 cmd = iscsit_find_cmd_from_itt(conn, init_task_tag); 477 if (!cmd) 478 return 0; 479 480 /* 481 * FIXME: This will not work for bidi commands. 482 */ 483 switch (cmd->data_direction) { 484 case DMA_TO_DEVICE: 485 return iscsit_handle_r2t_snack(cmd, buf, begrun, runlength); 486 case DMA_FROM_DEVICE: 487 return iscsit_handle_recovery_datain(cmd, buf, begrun, 488 runlength); 489 default: 490 pr_err("Unknown cmd->data_direction: 0x%02x\n", 491 cmd->data_direction); 492 return -1; 493 } 494 495 return 0; 496 } 497 498 /* #warning FIXME: Status SNACK needs to be dependent on OPCODE!!! */ 499 int iscsit_handle_status_snack( 500 struct iscsi_conn *conn, 501 itt_t init_task_tag, 502 u32 targ_xfer_tag, 503 u32 begrun, 504 u32 runlength) 505 { 506 struct iscsi_cmd *cmd = NULL; 507 u32 last_statsn; 508 int found_cmd; 509 510 if (conn->exp_statsn > begrun) { 511 pr_err("Got Status SNACK Begrun: 0x%08x, RunLength:" 512 " 0x%08x but already got ExpStatSN: 0x%08x on CID:" 513 " %hu.\n", begrun, runlength, conn->exp_statsn, 514 conn->cid); 515 return 0; 516 } 517 518 last_statsn = (!runlength) ? conn->stat_sn : (begrun + runlength); 519 520 while (begrun < last_statsn) { 521 found_cmd = 0; 522 523 spin_lock_bh(&conn->cmd_lock); 524 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 525 if (cmd->stat_sn == begrun) { 526 found_cmd = 1; 527 break; 528 } 529 } 530 spin_unlock_bh(&conn->cmd_lock); 531 532 if (!found_cmd) { 533 pr_err("Unable to find StatSN: 0x%08x for" 534 " a Status SNACK, assuming this was a" 535 " protactic SNACK for an untransmitted" 536 " StatSN, ignoring.\n", begrun); 537 begrun++; 538 continue; 539 } 540 541 spin_lock_bh(&cmd->istate_lock); 542 if (cmd->i_state == ISTATE_SEND_DATAIN) { 543 spin_unlock_bh(&cmd->istate_lock); 544 pr_err("Ignoring Status SNACK for BegRun:" 545 " 0x%08x, RunLength: 0x%08x, assuming this was" 546 " a protactic SNACK for an untransmitted" 547 " StatSN\n", begrun, runlength); 548 begrun++; 549 continue; 550 } 551 spin_unlock_bh(&cmd->istate_lock); 552 553 cmd->i_state = ISTATE_SEND_STATUS_RECOVERY; 554 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); 555 begrun++; 556 } 557 558 return 0; 559 } 560 561 int iscsit_handle_data_ack( 562 struct iscsi_conn *conn, 563 u32 targ_xfer_tag, 564 u32 begrun, 565 u32 runlength) 566 { 567 struct iscsi_cmd *cmd = NULL; 568 569 cmd = iscsit_find_cmd_from_ttt(conn, targ_xfer_tag); 570 if (!cmd) { 571 pr_err("Data ACK SNACK for TTT: 0x%08x is" 572 " invalid.\n", targ_xfer_tag); 573 return -1; 574 } 575 576 if (begrun <= cmd->acked_data_sn) { 577 pr_err("ITT: 0x%08x Data ACK SNACK BegRUN: 0x%08x is" 578 " less than the already acked DataSN: 0x%08x.\n", 579 cmd->init_task_tag, begrun, cmd->acked_data_sn); 580 return -1; 581 } 582 583 /* 584 * For Data ACK SNACK, BegRun is the next expected DataSN. 585 * (see iSCSI v19: 10.16.6) 586 */ 587 cmd->cmd_flags |= ICF_GOT_DATACK_SNACK; 588 cmd->acked_data_sn = (begrun - 1); 589 590 pr_debug("Received Data ACK SNACK for ITT: 0x%08x," 591 " updated acked DataSN to 0x%08x.\n", 592 cmd->init_task_tag, cmd->acked_data_sn); 593 594 return 0; 595 } 596 597 static int iscsit_send_recovery_r2t( 598 struct iscsi_cmd *cmd, 599 u32 offset, 600 u32 xfer_len) 601 { 602 int ret; 603 604 spin_lock_bh(&cmd->r2t_lock); 605 ret = iscsit_add_r2t_to_list(cmd, offset, xfer_len, 1, 0); 606 spin_unlock_bh(&cmd->r2t_lock); 607 608 return ret; 609 } 610 611 int iscsit_dataout_datapduinorder_no_fbit( 612 struct iscsi_cmd *cmd, 613 struct iscsi_pdu *pdu) 614 { 615 int i, send_recovery_r2t = 0, recovery = 0; 616 u32 length = 0, offset = 0, pdu_count = 0, xfer_len = 0; 617 struct iscsi_conn *conn = cmd->conn; 618 struct iscsi_pdu *first_pdu = NULL; 619 620 /* 621 * Get an struct iscsi_pdu pointer to the first PDU, and total PDU count 622 * of the DataOUT sequence. 623 */ 624 if (conn->sess->sess_ops->DataSequenceInOrder) { 625 for (i = 0; i < cmd->pdu_count; i++) { 626 if (cmd->pdu_list[i].seq_no == pdu->seq_no) { 627 if (!first_pdu) 628 first_pdu = &cmd->pdu_list[i]; 629 xfer_len += cmd->pdu_list[i].length; 630 pdu_count++; 631 } else if (pdu_count) 632 break; 633 } 634 } else { 635 struct iscsi_seq *seq = cmd->seq_ptr; 636 637 first_pdu = &cmd->pdu_list[seq->pdu_start]; 638 pdu_count = seq->pdu_count; 639 } 640 641 if (!first_pdu || !pdu_count) 642 return DATAOUT_CANNOT_RECOVER; 643 644 /* 645 * Loop through the ending DataOUT Sequence checking each struct iscsi_pdu. 646 * The following ugly logic does batching of not received PDUs. 647 */ 648 for (i = 0; i < pdu_count; i++) { 649 if (first_pdu[i].status == ISCSI_PDU_RECEIVED_OK) { 650 if (!send_recovery_r2t) 651 continue; 652 653 if (iscsit_send_recovery_r2t(cmd, offset, length) < 0) 654 return DATAOUT_CANNOT_RECOVER; 655 656 send_recovery_r2t = length = offset = 0; 657 continue; 658 } 659 /* 660 * Set recovery = 1 for any missing, CRC failed, or timed 661 * out PDUs to let the DataOUT logic know that this sequence 662 * has not been completed yet. 663 * 664 * Also, only send a Recovery R2T for ISCSI_PDU_NOT_RECEIVED. 665 * We assume if the PDU either failed CRC or timed out 666 * that a Recovery R2T has already been sent. 667 */ 668 recovery = 1; 669 670 if (first_pdu[i].status != ISCSI_PDU_NOT_RECEIVED) 671 continue; 672 673 if (!offset) 674 offset = first_pdu[i].offset; 675 length += first_pdu[i].length; 676 677 send_recovery_r2t = 1; 678 } 679 680 if (send_recovery_r2t) 681 if (iscsit_send_recovery_r2t(cmd, offset, length) < 0) 682 return DATAOUT_CANNOT_RECOVER; 683 684 return (!recovery) ? DATAOUT_NORMAL : DATAOUT_WITHIN_COMMAND_RECOVERY; 685 } 686 687 static int iscsit_recalculate_dataout_values( 688 struct iscsi_cmd *cmd, 689 u32 pdu_offset, 690 u32 pdu_length, 691 u32 *r2t_offset, 692 u32 *r2t_length) 693 { 694 int i; 695 struct iscsi_conn *conn = cmd->conn; 696 struct iscsi_pdu *pdu = NULL; 697 698 if (conn->sess->sess_ops->DataSequenceInOrder) { 699 cmd->data_sn = 0; 700 701 if (conn->sess->sess_ops->DataPDUInOrder) { 702 *r2t_offset = cmd->write_data_done; 703 *r2t_length = (cmd->seq_end_offset - 704 cmd->write_data_done); 705 return 0; 706 } 707 708 *r2t_offset = cmd->seq_start_offset; 709 *r2t_length = (cmd->seq_end_offset - cmd->seq_start_offset); 710 711 for (i = 0; i < cmd->pdu_count; i++) { 712 pdu = &cmd->pdu_list[i]; 713 714 if (pdu->status != ISCSI_PDU_RECEIVED_OK) 715 continue; 716 717 if ((pdu->offset >= cmd->seq_start_offset) && 718 ((pdu->offset + pdu->length) <= 719 cmd->seq_end_offset)) { 720 if (!cmd->unsolicited_data) 721 cmd->next_burst_len -= pdu->length; 722 else 723 cmd->first_burst_len -= pdu->length; 724 725 cmd->write_data_done -= pdu->length; 726 pdu->status = ISCSI_PDU_NOT_RECEIVED; 727 } 728 } 729 } else { 730 struct iscsi_seq *seq = NULL; 731 732 seq = iscsit_get_seq_holder(cmd, pdu_offset, pdu_length); 733 if (!seq) 734 return -1; 735 736 *r2t_offset = seq->orig_offset; 737 *r2t_length = seq->xfer_len; 738 739 cmd->write_data_done -= (seq->offset - seq->orig_offset); 740 if (cmd->immediate_data) 741 cmd->first_burst_len = cmd->write_data_done; 742 743 seq->data_sn = 0; 744 seq->offset = seq->orig_offset; 745 seq->next_burst_len = 0; 746 seq->status = DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY; 747 748 if (conn->sess->sess_ops->DataPDUInOrder) 749 return 0; 750 751 for (i = 0; i < seq->pdu_count; i++) { 752 pdu = &cmd->pdu_list[i+seq->pdu_start]; 753 754 if (pdu->status != ISCSI_PDU_RECEIVED_OK) 755 continue; 756 757 pdu->status = ISCSI_PDU_NOT_RECEIVED; 758 } 759 } 760 761 return 0; 762 } 763 764 int iscsit_recover_dataout_sequence( 765 struct iscsi_cmd *cmd, 766 u32 pdu_offset, 767 u32 pdu_length) 768 { 769 u32 r2t_length = 0, r2t_offset = 0; 770 771 spin_lock_bh(&cmd->istate_lock); 772 cmd->cmd_flags |= ICF_WITHIN_COMMAND_RECOVERY; 773 spin_unlock_bh(&cmd->istate_lock); 774 775 if (iscsit_recalculate_dataout_values(cmd, pdu_offset, pdu_length, 776 &r2t_offset, &r2t_length) < 0) 777 return DATAOUT_CANNOT_RECOVER; 778 779 iscsit_send_recovery_r2t(cmd, r2t_offset, r2t_length); 780 781 return DATAOUT_WITHIN_COMMAND_RECOVERY; 782 } 783 784 static struct iscsi_ooo_cmdsn *iscsit_allocate_ooo_cmdsn(void) 785 { 786 struct iscsi_ooo_cmdsn *ooo_cmdsn = NULL; 787 788 ooo_cmdsn = kmem_cache_zalloc(lio_ooo_cache, GFP_ATOMIC); 789 if (!ooo_cmdsn) { 790 pr_err("Unable to allocate memory for" 791 " struct iscsi_ooo_cmdsn.\n"); 792 return NULL; 793 } 794 INIT_LIST_HEAD(&ooo_cmdsn->ooo_list); 795 796 return ooo_cmdsn; 797 } 798 799 /* 800 * Called with sess->cmdsn_mutex held. 801 */ 802 static int iscsit_attach_ooo_cmdsn( 803 struct iscsi_session *sess, 804 struct iscsi_ooo_cmdsn *ooo_cmdsn) 805 { 806 struct iscsi_ooo_cmdsn *ooo_tail, *ooo_tmp; 807 /* 808 * We attach the struct iscsi_ooo_cmdsn entry to the out of order 809 * list in increasing CmdSN order. 810 * This allows iscsi_execute_ooo_cmdsns() to detect any 811 * additional CmdSN holes while performing delayed execution. 812 */ 813 if (list_empty(&sess->sess_ooo_cmdsn_list)) 814 list_add_tail(&ooo_cmdsn->ooo_list, 815 &sess->sess_ooo_cmdsn_list); 816 else { 817 ooo_tail = list_entry(sess->sess_ooo_cmdsn_list.prev, 818 typeof(*ooo_tail), ooo_list); 819 /* 820 * CmdSN is greater than the tail of the list. 821 */ 822 if (iscsi_sna_lt(ooo_tail->cmdsn, ooo_cmdsn->cmdsn)) 823 list_add_tail(&ooo_cmdsn->ooo_list, 824 &sess->sess_ooo_cmdsn_list); 825 else { 826 /* 827 * CmdSN is either lower than the head, or somewhere 828 * in the middle. 829 */ 830 list_for_each_entry(ooo_tmp, &sess->sess_ooo_cmdsn_list, 831 ooo_list) { 832 if (iscsi_sna_lt(ooo_tmp->cmdsn, ooo_cmdsn->cmdsn)) 833 continue; 834 835 /* Insert before this entry */ 836 list_add(&ooo_cmdsn->ooo_list, 837 ooo_tmp->ooo_list.prev); 838 break; 839 } 840 } 841 } 842 843 return 0; 844 } 845 846 /* 847 * Removes an struct iscsi_ooo_cmdsn from a session's list, 848 * called with struct iscsi_session->cmdsn_mutex held. 849 */ 850 void iscsit_remove_ooo_cmdsn( 851 struct iscsi_session *sess, 852 struct iscsi_ooo_cmdsn *ooo_cmdsn) 853 { 854 list_del(&ooo_cmdsn->ooo_list); 855 kmem_cache_free(lio_ooo_cache, ooo_cmdsn); 856 } 857 858 void iscsit_clear_ooo_cmdsns_for_conn(struct iscsi_conn *conn) 859 { 860 struct iscsi_ooo_cmdsn *ooo_cmdsn; 861 struct iscsi_session *sess = conn->sess; 862 863 mutex_lock(&sess->cmdsn_mutex); 864 list_for_each_entry(ooo_cmdsn, &sess->sess_ooo_cmdsn_list, ooo_list) { 865 if (ooo_cmdsn->cid != conn->cid) 866 continue; 867 868 ooo_cmdsn->cmd = NULL; 869 } 870 mutex_unlock(&sess->cmdsn_mutex); 871 } 872 873 /* 874 * Called with sess->cmdsn_mutex held. 875 */ 876 int iscsit_execute_ooo_cmdsns(struct iscsi_session *sess) 877 { 878 int ooo_count = 0; 879 struct iscsi_cmd *cmd = NULL; 880 struct iscsi_ooo_cmdsn *ooo_cmdsn, *ooo_cmdsn_tmp; 881 882 list_for_each_entry_safe(ooo_cmdsn, ooo_cmdsn_tmp, 883 &sess->sess_ooo_cmdsn_list, ooo_list) { 884 if (ooo_cmdsn->cmdsn != sess->exp_cmd_sn) 885 continue; 886 887 if (!ooo_cmdsn->cmd) { 888 sess->exp_cmd_sn++; 889 iscsit_remove_ooo_cmdsn(sess, ooo_cmdsn); 890 continue; 891 } 892 893 cmd = ooo_cmdsn->cmd; 894 cmd->i_state = cmd->deferred_i_state; 895 ooo_count++; 896 sess->exp_cmd_sn++; 897 pr_debug("Executing out of order CmdSN: 0x%08x," 898 " incremented ExpCmdSN to 0x%08x.\n", 899 cmd->cmd_sn, sess->exp_cmd_sn); 900 901 iscsit_remove_ooo_cmdsn(sess, ooo_cmdsn); 902 903 if (iscsit_execute_cmd(cmd, 1) < 0) 904 return -1; 905 906 continue; 907 } 908 909 return ooo_count; 910 } 911 912 /* 913 * Called either: 914 * 915 * 1. With sess->cmdsn_mutex held from iscsi_execute_ooo_cmdsns() 916 * or iscsi_check_received_cmdsn(). 917 * 2. With no locks held directly from iscsi_handle_XXX_pdu() functions 918 * for immediate commands. 919 */ 920 int iscsit_execute_cmd(struct iscsi_cmd *cmd, int ooo) 921 { 922 struct se_cmd *se_cmd = &cmd->se_cmd; 923 struct iscsi_conn *conn = cmd->conn; 924 int lr = 0; 925 926 spin_lock_bh(&cmd->istate_lock); 927 if (ooo) 928 cmd->cmd_flags &= ~ICF_OOO_CMDSN; 929 930 switch (cmd->iscsi_opcode) { 931 case ISCSI_OP_SCSI_CMD: 932 /* 933 * Go ahead and send the CHECK_CONDITION status for 934 * any SCSI CDB exceptions that may have occurred. 935 */ 936 if (cmd->sense_reason) { 937 if (cmd->sense_reason == TCM_RESERVATION_CONFLICT) { 938 cmd->i_state = ISTATE_SEND_STATUS; 939 spin_unlock_bh(&cmd->istate_lock); 940 iscsit_add_cmd_to_response_queue(cmd, cmd->conn, 941 cmd->i_state); 942 return 0; 943 } 944 spin_unlock_bh(&cmd->istate_lock); 945 /* 946 * Determine if delayed TASK_ABORTED status for WRITEs 947 * should be sent now if no unsolicited data out 948 * payloads are expected, or if the delayed status 949 * should be sent after unsolicited data out with 950 * ISCSI_FLAG_CMD_FINAL set in iscsi_handle_data_out() 951 */ 952 if (transport_check_aborted_status(se_cmd, 953 (cmd->unsolicited_data == 0)) != 0) 954 return 0; 955 /* 956 * Otherwise send CHECK_CONDITION and sense for 957 * exception 958 */ 959 return transport_send_check_condition_and_sense(se_cmd, 960 cmd->sense_reason, 0); 961 } 962 /* 963 * Special case for delayed CmdSN with Immediate 964 * Data and/or Unsolicited Data Out attached. 965 */ 966 if (cmd->immediate_data) { 967 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) { 968 spin_unlock_bh(&cmd->istate_lock); 969 target_execute_cmd(&cmd->se_cmd); 970 return 0; 971 } 972 spin_unlock_bh(&cmd->istate_lock); 973 974 if (!(cmd->cmd_flags & 975 ICF_NON_IMMEDIATE_UNSOLICITED_DATA)) { 976 /* 977 * Send the delayed TASK_ABORTED status for 978 * WRITEs if no more unsolicitied data is 979 * expected. 980 */ 981 if (transport_check_aborted_status(se_cmd, 1) 982 != 0) 983 return 0; 984 985 iscsit_set_dataout_sequence_values(cmd); 986 conn->conn_transport->iscsit_get_dataout(conn, cmd, false); 987 } 988 return 0; 989 } 990 /* 991 * The default handler. 992 */ 993 spin_unlock_bh(&cmd->istate_lock); 994 995 if ((cmd->data_direction == DMA_TO_DEVICE) && 996 !(cmd->cmd_flags & ICF_NON_IMMEDIATE_UNSOLICITED_DATA)) { 997 /* 998 * Send the delayed TASK_ABORTED status for WRITEs if 999 * no more nsolicitied data is expected. 1000 */ 1001 if (transport_check_aborted_status(se_cmd, 1) != 0) 1002 return 0; 1003 1004 iscsit_set_unsoliticed_dataout(cmd); 1005 } 1006 return transport_handle_cdb_direct(&cmd->se_cmd); 1007 1008 case ISCSI_OP_NOOP_OUT: 1009 case ISCSI_OP_TEXT: 1010 spin_unlock_bh(&cmd->istate_lock); 1011 iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state); 1012 break; 1013 case ISCSI_OP_SCSI_TMFUNC: 1014 if (cmd->se_cmd.se_tmr_req->response) { 1015 spin_unlock_bh(&cmd->istate_lock); 1016 iscsit_add_cmd_to_response_queue(cmd, cmd->conn, 1017 cmd->i_state); 1018 return 0; 1019 } 1020 spin_unlock_bh(&cmd->istate_lock); 1021 1022 return transport_generic_handle_tmr(&cmd->se_cmd); 1023 case ISCSI_OP_LOGOUT: 1024 spin_unlock_bh(&cmd->istate_lock); 1025 switch (cmd->logout_reason) { 1026 case ISCSI_LOGOUT_REASON_CLOSE_SESSION: 1027 lr = iscsit_logout_closesession(cmd, cmd->conn); 1028 break; 1029 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: 1030 lr = iscsit_logout_closeconnection(cmd, cmd->conn); 1031 break; 1032 case ISCSI_LOGOUT_REASON_RECOVERY: 1033 lr = iscsit_logout_removeconnforrecovery(cmd, cmd->conn); 1034 break; 1035 default: 1036 pr_err("Unknown iSCSI Logout Request Code:" 1037 " 0x%02x\n", cmd->logout_reason); 1038 return -1; 1039 } 1040 1041 return lr; 1042 default: 1043 spin_unlock_bh(&cmd->istate_lock); 1044 pr_err("Cannot perform out of order execution for" 1045 " unknown iSCSI Opcode: 0x%02x\n", cmd->iscsi_opcode); 1046 return -1; 1047 } 1048 1049 return 0; 1050 } 1051 1052 void iscsit_free_all_ooo_cmdsns(struct iscsi_session *sess) 1053 { 1054 struct iscsi_ooo_cmdsn *ooo_cmdsn, *ooo_cmdsn_tmp; 1055 1056 mutex_lock(&sess->cmdsn_mutex); 1057 list_for_each_entry_safe(ooo_cmdsn, ooo_cmdsn_tmp, 1058 &sess->sess_ooo_cmdsn_list, ooo_list) { 1059 1060 list_del(&ooo_cmdsn->ooo_list); 1061 kmem_cache_free(lio_ooo_cache, ooo_cmdsn); 1062 } 1063 mutex_unlock(&sess->cmdsn_mutex); 1064 } 1065 1066 int iscsit_handle_ooo_cmdsn( 1067 struct iscsi_session *sess, 1068 struct iscsi_cmd *cmd, 1069 u32 cmdsn) 1070 { 1071 int batch = 0; 1072 struct iscsi_ooo_cmdsn *ooo_cmdsn = NULL, *ooo_tail = NULL; 1073 1074 cmd->deferred_i_state = cmd->i_state; 1075 cmd->i_state = ISTATE_DEFERRED_CMD; 1076 cmd->cmd_flags |= ICF_OOO_CMDSN; 1077 1078 if (list_empty(&sess->sess_ooo_cmdsn_list)) 1079 batch = 1; 1080 else { 1081 ooo_tail = list_entry(sess->sess_ooo_cmdsn_list.prev, 1082 typeof(*ooo_tail), ooo_list); 1083 if (ooo_tail->cmdsn != (cmdsn - 1)) 1084 batch = 1; 1085 } 1086 1087 ooo_cmdsn = iscsit_allocate_ooo_cmdsn(); 1088 if (!ooo_cmdsn) 1089 return -ENOMEM; 1090 1091 ooo_cmdsn->cmd = cmd; 1092 ooo_cmdsn->batch_count = (batch) ? 1093 (cmdsn - sess->exp_cmd_sn) : 1; 1094 ooo_cmdsn->cid = cmd->conn->cid; 1095 ooo_cmdsn->exp_cmdsn = sess->exp_cmd_sn; 1096 ooo_cmdsn->cmdsn = cmdsn; 1097 1098 if (iscsit_attach_ooo_cmdsn(sess, ooo_cmdsn) < 0) { 1099 kmem_cache_free(lio_ooo_cache, ooo_cmdsn); 1100 return -ENOMEM; 1101 } 1102 1103 return 0; 1104 } 1105 1106 static int iscsit_set_dataout_timeout_values( 1107 struct iscsi_cmd *cmd, 1108 u32 *offset, 1109 u32 *length) 1110 { 1111 struct iscsi_conn *conn = cmd->conn; 1112 struct iscsi_r2t *r2t; 1113 1114 if (cmd->unsolicited_data) { 1115 *offset = 0; 1116 *length = (conn->sess->sess_ops->FirstBurstLength > 1117 cmd->se_cmd.data_length) ? 1118 cmd->se_cmd.data_length : 1119 conn->sess->sess_ops->FirstBurstLength; 1120 return 0; 1121 } 1122 1123 spin_lock_bh(&cmd->r2t_lock); 1124 if (list_empty(&cmd->cmd_r2t_list)) { 1125 pr_err("cmd->cmd_r2t_list is empty!\n"); 1126 spin_unlock_bh(&cmd->r2t_lock); 1127 return -1; 1128 } 1129 1130 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) { 1131 if (r2t->sent_r2t && !r2t->recovery_r2t && !r2t->seq_complete) { 1132 *offset = r2t->offset; 1133 *length = r2t->xfer_len; 1134 spin_unlock_bh(&cmd->r2t_lock); 1135 return 0; 1136 } 1137 } 1138 spin_unlock_bh(&cmd->r2t_lock); 1139 1140 pr_err("Unable to locate any incomplete DataOUT" 1141 " sequences for ITT: 0x%08x.\n", cmd->init_task_tag); 1142 1143 return -1; 1144 } 1145 1146 /* 1147 * NOTE: Called from interrupt (timer) context. 1148 */ 1149 static void iscsit_handle_dataout_timeout(unsigned long data) 1150 { 1151 u32 pdu_length = 0, pdu_offset = 0; 1152 u32 r2t_length = 0, r2t_offset = 0; 1153 struct iscsi_cmd *cmd = (struct iscsi_cmd *) data; 1154 struct iscsi_conn *conn = cmd->conn; 1155 struct iscsi_session *sess = NULL; 1156 struct iscsi_node_attrib *na; 1157 1158 iscsit_inc_conn_usage_count(conn); 1159 1160 spin_lock_bh(&cmd->dataout_timeout_lock); 1161 if (cmd->dataout_timer_flags & ISCSI_TF_STOP) { 1162 spin_unlock_bh(&cmd->dataout_timeout_lock); 1163 iscsit_dec_conn_usage_count(conn); 1164 return; 1165 } 1166 cmd->dataout_timer_flags &= ~ISCSI_TF_RUNNING; 1167 sess = conn->sess; 1168 na = iscsit_tpg_get_node_attrib(sess); 1169 1170 if (!sess->sess_ops->ErrorRecoveryLevel) { 1171 pr_debug("Unable to recover from DataOut timeout while" 1172 " in ERL=0.\n"); 1173 goto failure; 1174 } 1175 1176 if (++cmd->dataout_timeout_retries == na->dataout_timeout_retries) { 1177 pr_debug("Command ITT: 0x%08x exceeded max retries" 1178 " for DataOUT timeout %u, closing iSCSI connection.\n", 1179 cmd->init_task_tag, na->dataout_timeout_retries); 1180 goto failure; 1181 } 1182 1183 cmd->cmd_flags |= ICF_WITHIN_COMMAND_RECOVERY; 1184 1185 if (conn->sess->sess_ops->DataSequenceInOrder) { 1186 if (conn->sess->sess_ops->DataPDUInOrder) { 1187 pdu_offset = cmd->write_data_done; 1188 if ((pdu_offset + (conn->sess->sess_ops->MaxBurstLength - 1189 cmd->next_burst_len)) > cmd->se_cmd.data_length) 1190 pdu_length = (cmd->se_cmd.data_length - 1191 cmd->write_data_done); 1192 else 1193 pdu_length = (conn->sess->sess_ops->MaxBurstLength - 1194 cmd->next_burst_len); 1195 } else { 1196 pdu_offset = cmd->seq_start_offset; 1197 pdu_length = (cmd->seq_end_offset - 1198 cmd->seq_start_offset); 1199 } 1200 } else { 1201 if (iscsit_set_dataout_timeout_values(cmd, &pdu_offset, 1202 &pdu_length) < 0) 1203 goto failure; 1204 } 1205 1206 if (iscsit_recalculate_dataout_values(cmd, pdu_offset, pdu_length, 1207 &r2t_offset, &r2t_length) < 0) 1208 goto failure; 1209 1210 pr_debug("Command ITT: 0x%08x timed out waiting for" 1211 " completion of %sDataOUT Sequence Offset: %u, Length: %u\n", 1212 cmd->init_task_tag, (cmd->unsolicited_data) ? "Unsolicited " : 1213 "", r2t_offset, r2t_length); 1214 1215 if (iscsit_send_recovery_r2t(cmd, r2t_offset, r2t_length) < 0) 1216 goto failure; 1217 1218 iscsit_start_dataout_timer(cmd, conn); 1219 spin_unlock_bh(&cmd->dataout_timeout_lock); 1220 iscsit_dec_conn_usage_count(conn); 1221 1222 return; 1223 1224 failure: 1225 spin_unlock_bh(&cmd->dataout_timeout_lock); 1226 iscsit_cause_connection_reinstatement(conn, 0); 1227 iscsit_dec_conn_usage_count(conn); 1228 } 1229 1230 void iscsit_mod_dataout_timer(struct iscsi_cmd *cmd) 1231 { 1232 struct iscsi_conn *conn = cmd->conn; 1233 struct iscsi_session *sess = conn->sess; 1234 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 1235 1236 spin_lock_bh(&cmd->dataout_timeout_lock); 1237 if (!(cmd->dataout_timer_flags & ISCSI_TF_RUNNING)) { 1238 spin_unlock_bh(&cmd->dataout_timeout_lock); 1239 return; 1240 } 1241 1242 mod_timer(&cmd->dataout_timer, 1243 (get_jiffies_64() + na->dataout_timeout * HZ)); 1244 pr_debug("Updated DataOUT timer for ITT: 0x%08x", 1245 cmd->init_task_tag); 1246 spin_unlock_bh(&cmd->dataout_timeout_lock); 1247 } 1248 1249 /* 1250 * Called with cmd->dataout_timeout_lock held. 1251 */ 1252 void iscsit_start_dataout_timer( 1253 struct iscsi_cmd *cmd, 1254 struct iscsi_conn *conn) 1255 { 1256 struct iscsi_session *sess = conn->sess; 1257 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 1258 1259 if (cmd->dataout_timer_flags & ISCSI_TF_RUNNING) 1260 return; 1261 1262 pr_debug("Starting DataOUT timer for ITT: 0x%08x on" 1263 " CID: %hu.\n", cmd->init_task_tag, conn->cid); 1264 1265 init_timer(&cmd->dataout_timer); 1266 cmd->dataout_timer.expires = (get_jiffies_64() + na->dataout_timeout * HZ); 1267 cmd->dataout_timer.data = (unsigned long)cmd; 1268 cmd->dataout_timer.function = iscsit_handle_dataout_timeout; 1269 cmd->dataout_timer_flags &= ~ISCSI_TF_STOP; 1270 cmd->dataout_timer_flags |= ISCSI_TF_RUNNING; 1271 add_timer(&cmd->dataout_timer); 1272 } 1273 1274 void iscsit_stop_dataout_timer(struct iscsi_cmd *cmd) 1275 { 1276 spin_lock_bh(&cmd->dataout_timeout_lock); 1277 if (!(cmd->dataout_timer_flags & ISCSI_TF_RUNNING)) { 1278 spin_unlock_bh(&cmd->dataout_timeout_lock); 1279 return; 1280 } 1281 cmd->dataout_timer_flags |= ISCSI_TF_STOP; 1282 spin_unlock_bh(&cmd->dataout_timeout_lock); 1283 1284 del_timer_sync(&cmd->dataout_timer); 1285 1286 spin_lock_bh(&cmd->dataout_timeout_lock); 1287 cmd->dataout_timer_flags &= ~ISCSI_TF_RUNNING; 1288 pr_debug("Stopped DataOUT Timer for ITT: 0x%08x\n", 1289 cmd->init_task_tag); 1290 spin_unlock_bh(&cmd->dataout_timeout_lock); 1291 } 1292 EXPORT_SYMBOL(iscsit_stop_dataout_timer); 1293