1 /******************************************************************************
2 * This file contains error recovery level zero functions used by
3 * the iSCSI Target driver.
5 * \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
7 * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
9 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 ******************************************************************************/
22 #include <scsi/iscsi_proto.h>
23 #include <target/target_core_base.h>
24 #include <target/target_core_fabric.h>
26 #include "iscsi_target_core.h"
27 #include "iscsi_target_seq_pdu_list.h"
28 #include "iscsi_target_tq.h"
29 #include "iscsi_target_erl0.h"
30 #include "iscsi_target_erl1.h"
31 #include "iscsi_target_erl2.h"
32 #include "iscsi_target_util.h"
33 #include "iscsi_target.h"
36 * Used to set values in struct iscsi_cmd that iscsit_dataout_check_sequence()
37 * checks against to determine a PDU's Offset+Length is within the current
38 * DataOUT Sequence. Used for DataSequenceInOrder=Yes only.
40 void iscsit_set_dataout_sequence_values(
41 struct iscsi_cmd *cmd)
43 struct iscsi_conn *conn = cmd->conn;
45 * Still set seq_start_offset and seq_end_offset for Unsolicited
46 * DataOUT, even if DataSequenceInOrder=No.
48 if (cmd->unsolicited_data) {
49 cmd->seq_start_offset = cmd->write_data_done;
50 cmd->seq_end_offset = (cmd->write_data_done +
51 ((cmd->se_cmd.data_length >
52 conn->sess->sess_ops->FirstBurstLength) ?
53 conn->sess->sess_ops->FirstBurstLength : cmd->se_cmd.data_length));
57 if (!conn->sess->sess_ops->DataSequenceInOrder)
60 if (!cmd->seq_start_offset && !cmd->seq_end_offset) {
61 cmd->seq_start_offset = cmd->write_data_done;
62 cmd->seq_end_offset = (cmd->se_cmd.data_length >
63 conn->sess->sess_ops->MaxBurstLength) ?
64 (cmd->write_data_done +
65 conn->sess->sess_ops->MaxBurstLength) : cmd->se_cmd.data_length;
67 cmd->seq_start_offset = cmd->seq_end_offset;
68 cmd->seq_end_offset = ((cmd->seq_end_offset +
69 conn->sess->sess_ops->MaxBurstLength) >=
70 cmd->se_cmd.data_length) ? cmd->se_cmd.data_length :
71 (cmd->seq_end_offset +
72 conn->sess->sess_ops->MaxBurstLength);
76 static int iscsit_dataout_within_command_recovery_check(
77 struct iscsi_cmd *cmd,
80 struct iscsi_conn *conn = cmd->conn;
81 struct iscsi_data *hdr = (struct iscsi_data *) buf;
82 u32 payload_length = ntoh24(hdr->dlength);
85 * We do the within-command recovery checks here as it is
86 * the first function called in iscsi_check_pre_dataout().
87 * Basically, if we are in within-command recovery and
88 * the PDU does not contain the offset the sequence needs,
91 * This only applies to DataPDUInOrder=Yes, for
92 * DataPDUInOrder=No we only re-request the failed PDU
93 * and check that all PDUs in a sequence are received
94 * upon end of sequence.
96 if (conn->sess->sess_ops->DataSequenceInOrder) {
97 if ((cmd->cmd_flags & ICF_WITHIN_COMMAND_RECOVERY) &&
98 cmd->write_data_done != be32_to_cpu(hdr->offset))
101 cmd->cmd_flags &= ~ICF_WITHIN_COMMAND_RECOVERY;
103 struct iscsi_seq *seq;
105 seq = iscsit_get_seq_holder(cmd, be32_to_cpu(hdr->offset),
108 return DATAOUT_CANNOT_RECOVER;
110 * Set the struct iscsi_seq pointer to reuse later.
114 if (conn->sess->sess_ops->DataPDUInOrder) {
116 DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY &&
117 (seq->offset != be32_to_cpu(hdr->offset) ||
118 seq->data_sn != be32_to_cpu(hdr->datasn)))
122 DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY &&
123 seq->data_sn != be32_to_cpu(hdr->datasn))
127 if (seq->status == DATAOUT_SEQUENCE_COMPLETE)
130 if (seq->status != DATAOUT_SEQUENCE_COMPLETE)
134 return DATAOUT_NORMAL;
137 pr_err("Dumping DataOUT PDU Offset: %u Length: %d DataSN:"
138 " 0x%08x\n", hdr->offset, payload_length, hdr->datasn);
139 return iscsit_dump_data_payload(conn, payload_length, 1);
142 static int iscsit_dataout_check_unsolicited_sequence(
143 struct iscsi_cmd *cmd,
147 struct iscsi_conn *conn = cmd->conn;
148 struct iscsi_data *hdr = (struct iscsi_data *) buf;
149 u32 payload_length = ntoh24(hdr->dlength);
152 if ((be32_to_cpu(hdr->offset) < cmd->seq_start_offset) ||
153 ((be32_to_cpu(hdr->offset) + payload_length) > cmd->seq_end_offset)) {
154 pr_err("Command ITT: 0x%08x with Offset: %u,"
155 " Length: %u outside of Unsolicited Sequence %u:%u while"
156 " DataSequenceInOrder=Yes.\n", cmd->init_task_tag,
157 be32_to_cpu(hdr->offset), payload_length, cmd->seq_start_offset,
158 cmd->seq_end_offset);
159 return DATAOUT_CANNOT_RECOVER;
162 first_burst_len = (cmd->first_burst_len + payload_length);
164 if (first_burst_len > conn->sess->sess_ops->FirstBurstLength) {
165 pr_err("Total %u bytes exceeds FirstBurstLength: %u"
166 " for this Unsolicited DataOut Burst.\n",
167 first_burst_len, conn->sess->sess_ops->FirstBurstLength);
168 transport_send_check_condition_and_sense(&cmd->se_cmd,
169 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
170 return DATAOUT_CANNOT_RECOVER;
174 * Perform various MaxBurstLength and ISCSI_FLAG_CMD_FINAL sanity
175 * checks for the current Unsolicited DataOUT Sequence.
177 if (hdr->flags & ISCSI_FLAG_CMD_FINAL) {
179 * Ignore ISCSI_FLAG_CMD_FINAL checks while DataPDUInOrder=No, end of
180 * sequence checks are handled in
181 * iscsit_dataout_datapduinorder_no_fbit().
183 if (!conn->sess->sess_ops->DataPDUInOrder)
186 if ((first_burst_len != cmd->se_cmd.data_length) &&
187 (first_burst_len != conn->sess->sess_ops->FirstBurstLength)) {
188 pr_err("Unsolicited non-immediate data"
189 " received %u does not equal FirstBurstLength: %u, and"
190 " does not equal ExpXferLen %u.\n", first_burst_len,
191 conn->sess->sess_ops->FirstBurstLength,
192 cmd->se_cmd.data_length);
193 transport_send_check_condition_and_sense(&cmd->se_cmd,
194 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
195 return DATAOUT_CANNOT_RECOVER;
198 if (first_burst_len == conn->sess->sess_ops->FirstBurstLength) {
199 pr_err("Command ITT: 0x%08x reached"
200 " FirstBurstLength: %u, but ISCSI_FLAG_CMD_FINAL is not set. protocol"
201 " error.\n", cmd->init_task_tag,
202 conn->sess->sess_ops->FirstBurstLength);
203 return DATAOUT_CANNOT_RECOVER;
205 if (first_burst_len == cmd->se_cmd.data_length) {
206 pr_err("Command ITT: 0x%08x reached"
207 " ExpXferLen: %u, but ISCSI_FLAG_CMD_FINAL is not set. protocol"
208 " error.\n", cmd->init_task_tag, cmd->se_cmd.data_length);
209 return DATAOUT_CANNOT_RECOVER;
214 return DATAOUT_NORMAL;
217 static int iscsit_dataout_check_sequence(
218 struct iscsi_cmd *cmd,
222 struct iscsi_conn *conn = cmd->conn;
223 struct iscsi_seq *seq = NULL;
224 struct iscsi_data *hdr = (struct iscsi_data *) buf;
225 u32 payload_length = ntoh24(hdr->dlength);
228 * For DataSequenceInOrder=Yes: Check that the offset and offset+length
229 * is within range as defined by iscsi_set_dataout_sequence_values().
231 * For DataSequenceInOrder=No: Check that an struct iscsi_seq exists for
232 * offset+length tuple.
234 if (conn->sess->sess_ops->DataSequenceInOrder) {
236 * Due to possibility of recovery DataOUT sent by the initiator
237 * fullfilling an Recovery R2T, it's best to just dump the
238 * payload here, instead of erroring out.
240 if ((be32_to_cpu(hdr->offset) < cmd->seq_start_offset) ||
241 ((be32_to_cpu(hdr->offset) + payload_length) > cmd->seq_end_offset)) {
242 pr_err("Command ITT: 0x%08x with Offset: %u,"
243 " Length: %u outside of Sequence %u:%u while"
244 " DataSequenceInOrder=Yes.\n", cmd->init_task_tag,
245 be32_to_cpu(hdr->offset), payload_length, cmd->seq_start_offset,
246 cmd->seq_end_offset);
248 if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
249 return DATAOUT_CANNOT_RECOVER;
250 return DATAOUT_WITHIN_COMMAND_RECOVERY;
253 next_burst_len = (cmd->next_burst_len + payload_length);
255 seq = iscsit_get_seq_holder(cmd, be32_to_cpu(hdr->offset),
258 return DATAOUT_CANNOT_RECOVER;
260 * Set the struct iscsi_seq pointer to reuse later.
264 if (seq->status == DATAOUT_SEQUENCE_COMPLETE) {
265 if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
266 return DATAOUT_CANNOT_RECOVER;
267 return DATAOUT_WITHIN_COMMAND_RECOVERY;
270 next_burst_len = (seq->next_burst_len + payload_length);
273 if (next_burst_len > conn->sess->sess_ops->MaxBurstLength) {
274 pr_err("Command ITT: 0x%08x, NextBurstLength: %u and"
275 " Length: %u exceeds MaxBurstLength: %u. protocol"
276 " error.\n", cmd->init_task_tag,
277 (next_burst_len - payload_length),
278 payload_length, conn->sess->sess_ops->MaxBurstLength);
279 return DATAOUT_CANNOT_RECOVER;
283 * Perform various MaxBurstLength and ISCSI_FLAG_CMD_FINAL sanity
284 * checks for the current DataOUT Sequence.
286 if (hdr->flags & ISCSI_FLAG_CMD_FINAL) {
288 * Ignore ISCSI_FLAG_CMD_FINAL checks while DataPDUInOrder=No, end of
289 * sequence checks are handled in
290 * iscsit_dataout_datapduinorder_no_fbit().
292 if (!conn->sess->sess_ops->DataPDUInOrder)
295 if (conn->sess->sess_ops->DataSequenceInOrder) {
296 if ((next_burst_len <
297 conn->sess->sess_ops->MaxBurstLength) &&
298 ((cmd->write_data_done + payload_length) <
299 cmd->se_cmd.data_length)) {
300 pr_err("Command ITT: 0x%08x set ISCSI_FLAG_CMD_FINAL"
301 " before end of DataOUT sequence, protocol"
302 " error.\n", cmd->init_task_tag);
303 return DATAOUT_CANNOT_RECOVER;
306 if (next_burst_len < seq->xfer_len) {
307 pr_err("Command ITT: 0x%08x set ISCSI_FLAG_CMD_FINAL"
308 " before end of DataOUT sequence, protocol"
309 " error.\n", cmd->init_task_tag);
310 return DATAOUT_CANNOT_RECOVER;
314 if (conn->sess->sess_ops->DataSequenceInOrder) {
315 if (next_burst_len ==
316 conn->sess->sess_ops->MaxBurstLength) {
317 pr_err("Command ITT: 0x%08x reached"
318 " MaxBurstLength: %u, but ISCSI_FLAG_CMD_FINAL is"
319 " not set, protocol error.", cmd->init_task_tag,
320 conn->sess->sess_ops->MaxBurstLength);
321 return DATAOUT_CANNOT_RECOVER;
323 if ((cmd->write_data_done + payload_length) ==
324 cmd->se_cmd.data_length) {
325 pr_err("Command ITT: 0x%08x reached"
326 " last DataOUT PDU in sequence but ISCSI_FLAG_"
327 "CMD_FINAL is not set, protocol error.\n",
329 return DATAOUT_CANNOT_RECOVER;
332 if (next_burst_len == seq->xfer_len) {
333 pr_err("Command ITT: 0x%08x reached"
334 " last DataOUT PDU in sequence but ISCSI_FLAG_"
335 "CMD_FINAL is not set, protocol error.\n",
337 return DATAOUT_CANNOT_RECOVER;
343 return DATAOUT_NORMAL;
346 static int iscsit_dataout_check_datasn(
347 struct iscsi_cmd *cmd,
350 int dump = 0, recovery = 0;
352 struct iscsi_conn *conn = cmd->conn;
353 struct iscsi_data *hdr = (struct iscsi_data *) buf;
354 u32 payload_length = ntoh24(hdr->dlength);
357 * Considering the target has no method of re-requesting DataOUT
358 * by DataSN, if we receieve a greater DataSN than expected we
359 * assume the functions for DataPDUInOrder=[Yes,No] below will
362 * If the DataSN is less than expected, dump the payload.
364 if (conn->sess->sess_ops->DataSequenceInOrder)
365 data_sn = cmd->data_sn;
367 struct iscsi_seq *seq = cmd->seq_ptr;
368 data_sn = seq->data_sn;
371 if (be32_to_cpu(hdr->datasn) > data_sn) {
372 pr_err("Command ITT: 0x%08x, received DataSN: 0x%08x"
373 " higher than expected 0x%08x.\n", cmd->init_task_tag,
374 be32_to_cpu(hdr->datasn), data_sn);
377 } else if (be32_to_cpu(hdr->datasn) < data_sn) {
378 pr_err("Command ITT: 0x%08x, received DataSN: 0x%08x"
379 " lower than expected 0x%08x, discarding payload.\n",
380 cmd->init_task_tag, be32_to_cpu(hdr->datasn), data_sn);
385 return DATAOUT_NORMAL;
388 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
389 pr_err("Unable to perform within-command recovery"
391 return DATAOUT_CANNOT_RECOVER;
394 if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
395 return DATAOUT_CANNOT_RECOVER;
397 return (recovery || dump) ? DATAOUT_WITHIN_COMMAND_RECOVERY :
401 static int iscsit_dataout_pre_datapduinorder_yes(
402 struct iscsi_cmd *cmd,
405 int dump = 0, recovery = 0;
406 struct iscsi_conn *conn = cmd->conn;
407 struct iscsi_data *hdr = (struct iscsi_data *) buf;
408 u32 payload_length = ntoh24(hdr->dlength);
411 * For DataSequenceInOrder=Yes: If the offset is greater than the global
412 * DataPDUInOrder=Yes offset counter in struct iscsi_cmd a protcol error has
413 * occurred and fail the connection.
415 * For DataSequenceInOrder=No: If the offset is greater than the per
416 * sequence DataPDUInOrder=Yes offset counter in struct iscsi_seq a protocol
417 * error has occurred and fail the connection.
419 if (conn->sess->sess_ops->DataSequenceInOrder) {
420 if (be32_to_cpu(hdr->offset) != cmd->write_data_done) {
421 pr_err("Command ITT: 0x%08x, received offset"
422 " %u different than expected %u.\n", cmd->init_task_tag,
423 be32_to_cpu(hdr->offset), cmd->write_data_done);
428 struct iscsi_seq *seq = cmd->seq_ptr;
430 if (be32_to_cpu(hdr->offset) > seq->offset) {
431 pr_err("Command ITT: 0x%08x, received offset"
432 " %u greater than expected %u.\n", cmd->init_task_tag,
433 be32_to_cpu(hdr->offset), seq->offset);
436 } else if (be32_to_cpu(hdr->offset) < seq->offset) {
437 pr_err("Command ITT: 0x%08x, received offset"
438 " %u less than expected %u, discarding payload.\n",
439 cmd->init_task_tag, be32_to_cpu(hdr->offset),
446 return DATAOUT_NORMAL;
449 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
450 pr_err("Unable to perform within-command recovery"
452 return DATAOUT_CANNOT_RECOVER;
455 if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
456 return DATAOUT_CANNOT_RECOVER;
458 return (recovery) ? iscsit_recover_dataout_sequence(cmd,
459 be32_to_cpu(hdr->offset), payload_length) :
460 (dump) ? DATAOUT_WITHIN_COMMAND_RECOVERY : DATAOUT_NORMAL;
463 static int iscsit_dataout_pre_datapduinorder_no(
464 struct iscsi_cmd *cmd,
467 struct iscsi_pdu *pdu;
468 struct iscsi_data *hdr = (struct iscsi_data *) buf;
469 u32 payload_length = ntoh24(hdr->dlength);
471 pdu = iscsit_get_pdu_holder(cmd, be32_to_cpu(hdr->offset),
474 return DATAOUT_CANNOT_RECOVER;
478 switch (pdu->status) {
479 case ISCSI_PDU_NOT_RECEIVED:
480 case ISCSI_PDU_CRC_FAILED:
481 case ISCSI_PDU_TIMED_OUT:
483 case ISCSI_PDU_RECEIVED_OK:
484 pr_err("Command ITT: 0x%08x received already gotten"
485 " Offset: %u, Length: %u\n", cmd->init_task_tag,
486 be32_to_cpu(hdr->offset), payload_length);
487 return iscsit_dump_data_payload(cmd->conn, payload_length, 1);
489 return DATAOUT_CANNOT_RECOVER;
492 return DATAOUT_NORMAL;
495 static int iscsit_dataout_update_r2t(struct iscsi_cmd *cmd, u32 offset, u32 length)
497 struct iscsi_r2t *r2t;
499 if (cmd->unsolicited_data)
502 r2t = iscsit_get_r2t_for_eos(cmd, offset, length);
506 spin_lock_bh(&cmd->r2t_lock);
507 r2t->seq_complete = 1;
508 cmd->outstanding_r2ts--;
509 spin_unlock_bh(&cmd->r2t_lock);
514 static int iscsit_dataout_update_datapduinorder_no(
515 struct iscsi_cmd *cmd,
520 struct iscsi_pdu *pdu = cmd->pdu_ptr;
522 pdu->data_sn = data_sn;
524 switch (pdu->status) {
525 case ISCSI_PDU_NOT_RECEIVED:
526 pdu->status = ISCSI_PDU_RECEIVED_OK;
528 case ISCSI_PDU_CRC_FAILED:
529 pdu->status = ISCSI_PDU_RECEIVED_OK;
531 case ISCSI_PDU_TIMED_OUT:
532 pdu->status = ISCSI_PDU_RECEIVED_OK;
535 return DATAOUT_CANNOT_RECOVER;
539 ret = iscsit_dataout_datapduinorder_no_fbit(cmd, pdu);
540 if (ret == DATAOUT_CANNOT_RECOVER)
544 return DATAOUT_NORMAL;
547 static int iscsit_dataout_post_crc_passed(
548 struct iscsi_cmd *cmd,
551 int ret, send_r2t = 0;
552 struct iscsi_conn *conn = cmd->conn;
553 struct iscsi_seq *seq = NULL;
554 struct iscsi_data *hdr = (struct iscsi_data *) buf;
555 u32 payload_length = ntoh24(hdr->dlength);
557 if (cmd->unsolicited_data) {
558 if ((cmd->first_burst_len + payload_length) ==
559 conn->sess->sess_ops->FirstBurstLength) {
560 if (iscsit_dataout_update_r2t(cmd, be32_to_cpu(hdr->offset),
562 return DATAOUT_CANNOT_RECOVER;
566 if (!conn->sess->sess_ops->DataPDUInOrder) {
567 ret = iscsit_dataout_update_datapduinorder_no(cmd,
568 be32_to_cpu(hdr->datasn),
569 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
570 if (ret == DATAOUT_CANNOT_RECOVER)
574 cmd->first_burst_len += payload_length;
576 if (conn->sess->sess_ops->DataSequenceInOrder)
581 seq->offset += payload_length;
586 seq->status = DATAOUT_SEQUENCE_COMPLETE;
587 cmd->first_burst_len = 0;
588 cmd->unsolicited_data = 0;
591 if (conn->sess->sess_ops->DataSequenceInOrder) {
592 if ((cmd->next_burst_len + payload_length) ==
593 conn->sess->sess_ops->MaxBurstLength) {
594 if (iscsit_dataout_update_r2t(cmd,
595 be32_to_cpu(hdr->offset),
597 return DATAOUT_CANNOT_RECOVER;
601 if (!conn->sess->sess_ops->DataPDUInOrder) {
602 ret = iscsit_dataout_update_datapduinorder_no(
603 cmd, be32_to_cpu(hdr->datasn),
604 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
605 if (ret == DATAOUT_CANNOT_RECOVER)
609 cmd->next_burst_len += payload_length;
613 cmd->next_burst_len = 0;
617 if ((seq->next_burst_len + payload_length) ==
619 if (iscsit_dataout_update_r2t(cmd,
620 be32_to_cpu(hdr->offset),
622 return DATAOUT_CANNOT_RECOVER;
626 if (!conn->sess->sess_ops->DataPDUInOrder) {
627 ret = iscsit_dataout_update_datapduinorder_no(
628 cmd, be32_to_cpu(hdr->datasn),
629 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
630 if (ret == DATAOUT_CANNOT_RECOVER)
635 seq->offset += payload_length;
636 seq->next_burst_len += payload_length;
639 seq->next_burst_len = 0;
640 seq->status = DATAOUT_SEQUENCE_COMPLETE;
645 if (send_r2t && conn->sess->sess_ops->DataSequenceInOrder)
648 cmd->write_data_done += payload_length;
650 if (cmd->write_data_done == cmd->se_cmd.data_length)
651 return DATAOUT_SEND_TO_TRANSPORT;
653 return DATAOUT_SEND_R2T;
655 return DATAOUT_NORMAL;
658 static int iscsit_dataout_post_crc_failed(
659 struct iscsi_cmd *cmd,
662 struct iscsi_conn *conn = cmd->conn;
663 struct iscsi_pdu *pdu;
664 struct iscsi_data *hdr = (struct iscsi_data *) buf;
665 u32 payload_length = ntoh24(hdr->dlength);
667 if (conn->sess->sess_ops->DataPDUInOrder)
670 * The rest of this function is only called when DataPDUInOrder=No.
674 switch (pdu->status) {
675 case ISCSI_PDU_NOT_RECEIVED:
676 pdu->status = ISCSI_PDU_CRC_FAILED;
678 case ISCSI_PDU_CRC_FAILED:
680 case ISCSI_PDU_TIMED_OUT:
681 pdu->status = ISCSI_PDU_CRC_FAILED;
684 return DATAOUT_CANNOT_RECOVER;
688 return iscsit_recover_dataout_sequence(cmd, be32_to_cpu(hdr->offset),
693 * Called from iscsit_handle_data_out() before DataOUT Payload is received
696 int iscsit_check_pre_dataout(
697 struct iscsi_cmd *cmd,
701 struct iscsi_conn *conn = cmd->conn;
703 ret = iscsit_dataout_within_command_recovery_check(cmd, buf);
704 if ((ret == DATAOUT_WITHIN_COMMAND_RECOVERY) ||
705 (ret == DATAOUT_CANNOT_RECOVER))
708 ret = iscsit_dataout_check_datasn(cmd, buf);
709 if ((ret == DATAOUT_WITHIN_COMMAND_RECOVERY) ||
710 (ret == DATAOUT_CANNOT_RECOVER))
713 if (cmd->unsolicited_data) {
714 ret = iscsit_dataout_check_unsolicited_sequence(cmd, buf);
715 if ((ret == DATAOUT_WITHIN_COMMAND_RECOVERY) ||
716 (ret == DATAOUT_CANNOT_RECOVER))
719 ret = iscsit_dataout_check_sequence(cmd, buf);
720 if ((ret == DATAOUT_WITHIN_COMMAND_RECOVERY) ||
721 (ret == DATAOUT_CANNOT_RECOVER))
725 return (conn->sess->sess_ops->DataPDUInOrder) ?
726 iscsit_dataout_pre_datapduinorder_yes(cmd, buf) :
727 iscsit_dataout_pre_datapduinorder_no(cmd, buf);
731 * Called from iscsit_handle_data_out() after DataOUT Payload is received
734 int iscsit_check_post_dataout(
735 struct iscsi_cmd *cmd,
739 struct iscsi_conn *conn = cmd->conn;
741 cmd->dataout_timeout_retries = 0;
743 if (!data_crc_failed)
744 return iscsit_dataout_post_crc_passed(cmd, buf);
746 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
747 pr_err("Unable to recover from DataOUT CRC"
748 " failure while ERL=0, closing session.\n");
749 iscsit_add_reject_from_cmd(ISCSI_REASON_DATA_DIGEST_ERROR,
751 return DATAOUT_CANNOT_RECOVER;
754 iscsit_add_reject_from_cmd(ISCSI_REASON_DATA_DIGEST_ERROR,
756 return iscsit_dataout_post_crc_failed(cmd, buf);
760 static void iscsit_handle_time2retain_timeout(unsigned long data)
762 struct iscsi_session *sess = (struct iscsi_session *) data;
763 struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
764 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
766 spin_lock_bh(&se_tpg->session_lock);
767 if (sess->time2retain_timer_flags & ISCSI_TF_STOP) {
768 spin_unlock_bh(&se_tpg->session_lock);
771 if (atomic_read(&sess->session_reinstatement)) {
772 pr_err("Exiting Time2Retain handler because"
773 " session_reinstatement=1\n");
774 spin_unlock_bh(&se_tpg->session_lock);
777 sess->time2retain_timer_flags |= ISCSI_TF_EXPIRED;
779 pr_err("Time2Retain timer expired for SID: %u, cleaning up"
780 " iSCSI session.\n", sess->sid);
782 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
785 spin_lock(&tiqn->sess_err_stats.lock);
786 strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
787 (void *)sess->sess_ops->InitiatorName);
788 tiqn->sess_err_stats.last_sess_failure_type =
789 ISCSI_SESS_ERR_CXN_TIMEOUT;
790 tiqn->sess_err_stats.cxn_timeout_errors++;
791 sess->conn_timeout_errors++;
792 spin_unlock(&tiqn->sess_err_stats.lock);
796 spin_unlock_bh(&se_tpg->session_lock);
797 target_put_session(sess->se_sess);
800 void iscsit_start_time2retain_handler(struct iscsi_session *sess)
804 * Only start Time2Retain timer when the associated TPG is still in
805 * an ACTIVE (eg: not disabled or shutdown) state.
807 spin_lock(&ISCSI_TPG_S(sess)->tpg_state_lock);
808 tpg_active = (ISCSI_TPG_S(sess)->tpg_state == TPG_STATE_ACTIVE);
809 spin_unlock(&ISCSI_TPG_S(sess)->tpg_state_lock);
814 if (sess->time2retain_timer_flags & ISCSI_TF_RUNNING)
817 pr_debug("Starting Time2Retain timer for %u seconds on"
818 " SID: %u\n", sess->sess_ops->DefaultTime2Retain, sess->sid);
820 init_timer(&sess->time2retain_timer);
821 sess->time2retain_timer.expires =
822 (get_jiffies_64() + sess->sess_ops->DefaultTime2Retain * HZ);
823 sess->time2retain_timer.data = (unsigned long)sess;
824 sess->time2retain_timer.function = iscsit_handle_time2retain_timeout;
825 sess->time2retain_timer_flags &= ~ISCSI_TF_STOP;
826 sess->time2retain_timer_flags |= ISCSI_TF_RUNNING;
827 add_timer(&sess->time2retain_timer);
831 * Called with spin_lock_bh(&struct se_portal_group->session_lock) held
833 int iscsit_stop_time2retain_timer(struct iscsi_session *sess)
835 struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
836 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
838 if (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)
841 if (!(sess->time2retain_timer_flags & ISCSI_TF_RUNNING))
844 sess->time2retain_timer_flags |= ISCSI_TF_STOP;
845 spin_unlock_bh(&se_tpg->session_lock);
847 del_timer_sync(&sess->time2retain_timer);
849 spin_lock_bh(&se_tpg->session_lock);
850 sess->time2retain_timer_flags &= ~ISCSI_TF_RUNNING;
851 pr_debug("Stopped Time2Retain Timer for SID: %u\n",
856 void iscsit_connection_reinstatement_rcfr(struct iscsi_conn *conn)
858 spin_lock_bh(&conn->state_lock);
859 if (atomic_read(&conn->connection_exit)) {
860 spin_unlock_bh(&conn->state_lock);
864 if (atomic_read(&conn->transport_failed)) {
865 spin_unlock_bh(&conn->state_lock);
868 spin_unlock_bh(&conn->state_lock);
870 iscsi_thread_set_force_reinstatement(conn);
873 wait_for_completion(&conn->conn_wait_rcfr_comp);
874 complete(&conn->conn_post_wait_comp);
877 void iscsit_cause_connection_reinstatement(struct iscsi_conn *conn, int sleep)
879 spin_lock_bh(&conn->state_lock);
880 if (atomic_read(&conn->connection_exit)) {
881 spin_unlock_bh(&conn->state_lock);
885 if (atomic_read(&conn->transport_failed)) {
886 spin_unlock_bh(&conn->state_lock);
890 if (atomic_read(&conn->connection_reinstatement)) {
891 spin_unlock_bh(&conn->state_lock);
895 if (iscsi_thread_set_force_reinstatement(conn) < 0) {
896 spin_unlock_bh(&conn->state_lock);
900 atomic_set(&conn->connection_reinstatement, 1);
902 spin_unlock_bh(&conn->state_lock);
906 atomic_set(&conn->sleep_on_conn_wait_comp, 1);
907 spin_unlock_bh(&conn->state_lock);
909 wait_for_completion(&conn->conn_wait_comp);
910 complete(&conn->conn_post_wait_comp);
913 void iscsit_fall_back_to_erl0(struct iscsi_session *sess)
915 pr_debug("Falling back to ErrorRecoveryLevel=0 for SID:"
918 atomic_set(&sess->session_fall_back_to_erl0, 1);
921 static void iscsit_handle_connection_cleanup(struct iscsi_conn *conn)
923 struct iscsi_session *sess = conn->sess;
925 if ((sess->sess_ops->ErrorRecoveryLevel == 2) &&
926 !atomic_read(&sess->session_reinstatement) &&
927 !atomic_read(&sess->session_fall_back_to_erl0))
928 iscsit_connection_recovery_transport_reset(conn);
930 pr_debug("Performing cleanup for failed iSCSI"
931 " Connection ID: %hu from %s\n", conn->cid,
932 sess->sess_ops->InitiatorName);
933 iscsit_close_connection(conn);
937 void iscsit_take_action_for_connection_exit(struct iscsi_conn *conn)
939 spin_lock_bh(&conn->state_lock);
940 if (atomic_read(&conn->connection_exit)) {
941 spin_unlock_bh(&conn->state_lock);
944 atomic_set(&conn->connection_exit, 1);
946 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT) {
947 spin_unlock_bh(&conn->state_lock);
948 iscsit_close_connection(conn);
952 if (conn->conn_state == TARG_CONN_STATE_CLEANUP_WAIT) {
953 spin_unlock_bh(&conn->state_lock);
957 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
958 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
959 spin_unlock_bh(&conn->state_lock);
961 iscsit_handle_connection_cleanup(conn);
965 * This is the simple function that makes the magic of
966 * sync and steering happen in the follow paradoxical order:
968 * 0) Receive conn->of_marker (bytes left until next OFMarker)
969 * bytes into an offload buffer. When we pass the exact number
970 * of bytes in conn->of_marker, iscsit_dump_data_payload() and hence
971 * rx_data() will automatically receive the identical u32 marker
972 * values and store it in conn->of_marker_offset;
973 * 1) Now conn->of_marker_offset will contain the offset to the start
974 * of the next iSCSI PDU. Dump these remaining bytes into another
977 * Next byte in the TCP stream will contain the next iSCSI PDU!
980 int iscsit_recover_from_unknown_opcode(struct iscsi_conn *conn)
983 * Make sure the remaining bytes to next maker is a sane value.
985 if (conn->of_marker > (conn->conn_ops->OFMarkInt * 4)) {
986 pr_err("Remaining bytes to OFMarker: %u exceeds"
987 " OFMarkInt bytes: %u.\n", conn->of_marker,
988 conn->conn_ops->OFMarkInt * 4);
992 pr_debug("Advancing %u bytes in TCP stream to get to the"
993 " next OFMarker.\n", conn->of_marker);
995 if (iscsit_dump_data_payload(conn, conn->of_marker, 0) < 0)
999 * Make sure the offset marker we retrived is a valid value.
1001 if (conn->of_marker_offset > (ISCSI_HDR_LEN + (ISCSI_CRC_LEN * 2) +
1002 conn->conn_ops->MaxRecvDataSegmentLength)) {
1003 pr_err("OfMarker offset value: %u exceeds limit.\n",
1004 conn->of_marker_offset);
1008 pr_debug("Discarding %u bytes of TCP stream to get to the"
1009 " next iSCSI Opcode.\n", conn->of_marker_offset);
1011 if (iscsit_dump_data_payload(conn, conn->of_marker_offset, 0) < 0)