1 /******************************************************************************
2 * This file contains error recovery level zero functions used by
3 * the iSCSI Target driver.
5 * (c) Copyright 2007-2013 Datera, Inc.
7 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 ******************************************************************************/
20 #include <scsi/iscsi_proto.h>
21 #include <target/target_core_base.h>
22 #include <target/target_core_fabric.h>
24 #include <target/iscsi/iscsi_target_core.h>
25 #include "iscsi_target_seq_pdu_list.h"
26 #include "iscsi_target_tq.h"
27 #include "iscsi_target_erl0.h"
28 #include "iscsi_target_erl1.h"
29 #include "iscsi_target_erl2.h"
30 #include "iscsi_target_util.h"
31 #include "iscsi_target.h"
34 * Used to set values in struct iscsi_cmd that iscsit_dataout_check_sequence()
35 * checks against to determine a PDU's Offset+Length is within the current
36 * DataOUT Sequence. Used for DataSequenceInOrder=Yes only.
38 void iscsit_set_dataout_sequence_values(
39 struct iscsi_cmd *cmd)
41 struct iscsi_conn *conn = cmd->conn;
43 * Still set seq_start_offset and seq_end_offset for Unsolicited
44 * DataOUT, even if DataSequenceInOrder=No.
46 if (cmd->unsolicited_data) {
47 cmd->seq_start_offset = cmd->write_data_done;
48 cmd->seq_end_offset = (cmd->write_data_done +
49 ((cmd->se_cmd.data_length >
50 conn->sess->sess_ops->FirstBurstLength) ?
51 conn->sess->sess_ops->FirstBurstLength : cmd->se_cmd.data_length));
55 if (!conn->sess->sess_ops->DataSequenceInOrder)
58 if (!cmd->seq_start_offset && !cmd->seq_end_offset) {
59 cmd->seq_start_offset = cmd->write_data_done;
60 cmd->seq_end_offset = (cmd->se_cmd.data_length >
61 conn->sess->sess_ops->MaxBurstLength) ?
62 (cmd->write_data_done +
63 conn->sess->sess_ops->MaxBurstLength) : cmd->se_cmd.data_length;
65 cmd->seq_start_offset = cmd->seq_end_offset;
66 cmd->seq_end_offset = ((cmd->seq_end_offset +
67 conn->sess->sess_ops->MaxBurstLength) >=
68 cmd->se_cmd.data_length) ? cmd->se_cmd.data_length :
69 (cmd->seq_end_offset +
70 conn->sess->sess_ops->MaxBurstLength);
74 static int iscsit_dataout_within_command_recovery_check(
75 struct iscsi_cmd *cmd,
78 struct iscsi_conn *conn = cmd->conn;
79 struct iscsi_data *hdr = (struct iscsi_data *) buf;
80 u32 payload_length = ntoh24(hdr->dlength);
83 * We do the within-command recovery checks here as it is
84 * the first function called in iscsi_check_pre_dataout().
85 * Basically, if we are in within-command recovery and
86 * the PDU does not contain the offset the sequence needs,
89 * This only applies to DataPDUInOrder=Yes, for
90 * DataPDUInOrder=No we only re-request the failed PDU
91 * and check that all PDUs in a sequence are received
92 * upon end of sequence.
94 if (conn->sess->sess_ops->DataSequenceInOrder) {
95 if ((cmd->cmd_flags & ICF_WITHIN_COMMAND_RECOVERY) &&
96 cmd->write_data_done != be32_to_cpu(hdr->offset))
99 cmd->cmd_flags &= ~ICF_WITHIN_COMMAND_RECOVERY;
101 struct iscsi_seq *seq;
103 seq = iscsit_get_seq_holder(cmd, be32_to_cpu(hdr->offset),
106 return DATAOUT_CANNOT_RECOVER;
108 * Set the struct iscsi_seq pointer to reuse later.
112 if (conn->sess->sess_ops->DataPDUInOrder) {
114 DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY &&
115 (seq->offset != be32_to_cpu(hdr->offset) ||
116 seq->data_sn != be32_to_cpu(hdr->datasn)))
120 DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY &&
121 seq->data_sn != be32_to_cpu(hdr->datasn))
125 if (seq->status == DATAOUT_SEQUENCE_COMPLETE)
128 if (seq->status != DATAOUT_SEQUENCE_COMPLETE)
132 return DATAOUT_NORMAL;
135 pr_err("Dumping DataOUT PDU Offset: %u Length: %d DataSN:"
136 " 0x%08x\n", hdr->offset, payload_length, hdr->datasn);
137 return iscsit_dump_data_payload(conn, payload_length, 1);
140 static int iscsit_dataout_check_unsolicited_sequence(
141 struct iscsi_cmd *cmd,
145 struct iscsi_conn *conn = cmd->conn;
146 struct iscsi_data *hdr = (struct iscsi_data *) buf;
147 u32 payload_length = ntoh24(hdr->dlength);
150 if ((be32_to_cpu(hdr->offset) < cmd->seq_start_offset) ||
151 ((be32_to_cpu(hdr->offset) + payload_length) > cmd->seq_end_offset)) {
152 pr_err("Command ITT: 0x%08x with Offset: %u,"
153 " Length: %u outside of Unsolicited Sequence %u:%u while"
154 " DataSequenceInOrder=Yes.\n", cmd->init_task_tag,
155 be32_to_cpu(hdr->offset), payload_length, cmd->seq_start_offset,
156 cmd->seq_end_offset);
157 return DATAOUT_CANNOT_RECOVER;
160 first_burst_len = (cmd->first_burst_len + payload_length);
162 if (first_burst_len > conn->sess->sess_ops->FirstBurstLength) {
163 pr_err("Total %u bytes exceeds FirstBurstLength: %u"
164 " for this Unsolicited DataOut Burst.\n",
165 first_burst_len, conn->sess->sess_ops->FirstBurstLength);
166 transport_send_check_condition_and_sense(&cmd->se_cmd,
167 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
168 return DATAOUT_CANNOT_RECOVER;
172 * Perform various MaxBurstLength and ISCSI_FLAG_CMD_FINAL sanity
173 * checks for the current Unsolicited DataOUT Sequence.
175 if (hdr->flags & ISCSI_FLAG_CMD_FINAL) {
177 * Ignore ISCSI_FLAG_CMD_FINAL checks while DataPDUInOrder=No, end of
178 * sequence checks are handled in
179 * iscsit_dataout_datapduinorder_no_fbit().
181 if (!conn->sess->sess_ops->DataPDUInOrder)
184 if ((first_burst_len != cmd->se_cmd.data_length) &&
185 (first_burst_len != conn->sess->sess_ops->FirstBurstLength)) {
186 pr_err("Unsolicited non-immediate data"
187 " received %u does not equal FirstBurstLength: %u, and"
188 " does not equal ExpXferLen %u.\n", first_burst_len,
189 conn->sess->sess_ops->FirstBurstLength,
190 cmd->se_cmd.data_length);
191 transport_send_check_condition_and_sense(&cmd->se_cmd,
192 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
193 return DATAOUT_CANNOT_RECOVER;
196 if (first_burst_len == conn->sess->sess_ops->FirstBurstLength) {
197 pr_err("Command ITT: 0x%08x reached"
198 " FirstBurstLength: %u, but ISCSI_FLAG_CMD_FINAL is not set. protocol"
199 " error.\n", cmd->init_task_tag,
200 conn->sess->sess_ops->FirstBurstLength);
201 return DATAOUT_CANNOT_RECOVER;
203 if (first_burst_len == cmd->se_cmd.data_length) {
204 pr_err("Command ITT: 0x%08x reached"
205 " ExpXferLen: %u, but ISCSI_FLAG_CMD_FINAL is not set. protocol"
206 " error.\n", cmd->init_task_tag, cmd->se_cmd.data_length);
207 return DATAOUT_CANNOT_RECOVER;
212 return DATAOUT_NORMAL;
215 static int iscsit_dataout_check_sequence(
216 struct iscsi_cmd *cmd,
220 struct iscsi_conn *conn = cmd->conn;
221 struct iscsi_seq *seq = NULL;
222 struct iscsi_data *hdr = (struct iscsi_data *) buf;
223 u32 payload_length = ntoh24(hdr->dlength);
226 * For DataSequenceInOrder=Yes: Check that the offset and offset+length
227 * is within range as defined by iscsi_set_dataout_sequence_values().
229 * For DataSequenceInOrder=No: Check that an struct iscsi_seq exists for
230 * offset+length tuple.
232 if (conn->sess->sess_ops->DataSequenceInOrder) {
234 * Due to possibility of recovery DataOUT sent by the initiator
235 * fullfilling an Recovery R2T, it's best to just dump the
236 * payload here, instead of erroring out.
238 if ((be32_to_cpu(hdr->offset) < cmd->seq_start_offset) ||
239 ((be32_to_cpu(hdr->offset) + payload_length) > cmd->seq_end_offset)) {
240 pr_err("Command ITT: 0x%08x with Offset: %u,"
241 " Length: %u outside of Sequence %u:%u while"
242 " DataSequenceInOrder=Yes.\n", cmd->init_task_tag,
243 be32_to_cpu(hdr->offset), payload_length, cmd->seq_start_offset,
244 cmd->seq_end_offset);
246 if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
247 return DATAOUT_CANNOT_RECOVER;
248 return DATAOUT_WITHIN_COMMAND_RECOVERY;
251 next_burst_len = (cmd->next_burst_len + payload_length);
253 seq = iscsit_get_seq_holder(cmd, be32_to_cpu(hdr->offset),
256 return DATAOUT_CANNOT_RECOVER;
258 * Set the struct iscsi_seq pointer to reuse later.
262 if (seq->status == DATAOUT_SEQUENCE_COMPLETE) {
263 if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
264 return DATAOUT_CANNOT_RECOVER;
265 return DATAOUT_WITHIN_COMMAND_RECOVERY;
268 next_burst_len = (seq->next_burst_len + payload_length);
271 if (next_burst_len > conn->sess->sess_ops->MaxBurstLength) {
272 pr_err("Command ITT: 0x%08x, NextBurstLength: %u and"
273 " Length: %u exceeds MaxBurstLength: %u. protocol"
274 " error.\n", cmd->init_task_tag,
275 (next_burst_len - payload_length),
276 payload_length, conn->sess->sess_ops->MaxBurstLength);
277 return DATAOUT_CANNOT_RECOVER;
281 * Perform various MaxBurstLength and ISCSI_FLAG_CMD_FINAL sanity
282 * checks for the current DataOUT Sequence.
284 if (hdr->flags & ISCSI_FLAG_CMD_FINAL) {
286 * Ignore ISCSI_FLAG_CMD_FINAL checks while DataPDUInOrder=No, end of
287 * sequence checks are handled in
288 * iscsit_dataout_datapduinorder_no_fbit().
290 if (!conn->sess->sess_ops->DataPDUInOrder)
293 if (conn->sess->sess_ops->DataSequenceInOrder) {
294 if ((next_burst_len <
295 conn->sess->sess_ops->MaxBurstLength) &&
296 ((cmd->write_data_done + payload_length) <
297 cmd->se_cmd.data_length)) {
298 pr_err("Command ITT: 0x%08x set ISCSI_FLAG_CMD_FINAL"
299 " before end of DataOUT sequence, protocol"
300 " error.\n", cmd->init_task_tag);
301 return DATAOUT_CANNOT_RECOVER;
304 if (next_burst_len < seq->xfer_len) {
305 pr_err("Command ITT: 0x%08x set ISCSI_FLAG_CMD_FINAL"
306 " before end of DataOUT sequence, protocol"
307 " error.\n", cmd->init_task_tag);
308 return DATAOUT_CANNOT_RECOVER;
312 if (conn->sess->sess_ops->DataSequenceInOrder) {
313 if (next_burst_len ==
314 conn->sess->sess_ops->MaxBurstLength) {
315 pr_err("Command ITT: 0x%08x reached"
316 " MaxBurstLength: %u, but ISCSI_FLAG_CMD_FINAL is"
317 " not set, protocol error.", cmd->init_task_tag,
318 conn->sess->sess_ops->MaxBurstLength);
319 return DATAOUT_CANNOT_RECOVER;
321 if ((cmd->write_data_done + payload_length) ==
322 cmd->se_cmd.data_length) {
323 pr_err("Command ITT: 0x%08x reached"
324 " last DataOUT PDU in sequence but ISCSI_FLAG_"
325 "CMD_FINAL is not set, protocol error.\n",
327 return DATAOUT_CANNOT_RECOVER;
330 if (next_burst_len == seq->xfer_len) {
331 pr_err("Command ITT: 0x%08x reached"
332 " last DataOUT PDU in sequence but ISCSI_FLAG_"
333 "CMD_FINAL is not set, protocol error.\n",
335 return DATAOUT_CANNOT_RECOVER;
341 return DATAOUT_NORMAL;
344 static int iscsit_dataout_check_datasn(
345 struct iscsi_cmd *cmd,
349 struct iscsi_conn *conn = cmd->conn;
350 struct iscsi_data *hdr = (struct iscsi_data *) buf;
351 u32 payload_length = ntoh24(hdr->dlength);
354 * Considering the target has no method of re-requesting DataOUT
355 * by DataSN, if we receieve a greater DataSN than expected we
356 * assume the functions for DataPDUInOrder=[Yes,No] below will
359 * If the DataSN is less than expected, dump the payload.
361 if (conn->sess->sess_ops->DataSequenceInOrder)
362 data_sn = cmd->data_sn;
364 struct iscsi_seq *seq = cmd->seq_ptr;
365 data_sn = seq->data_sn;
368 if (be32_to_cpu(hdr->datasn) > data_sn) {
369 pr_err("Command ITT: 0x%08x, received DataSN: 0x%08x"
370 " higher than expected 0x%08x.\n", cmd->init_task_tag,
371 be32_to_cpu(hdr->datasn), data_sn);
373 } else if (be32_to_cpu(hdr->datasn) < data_sn) {
374 pr_err("Command ITT: 0x%08x, received DataSN: 0x%08x"
375 " lower than expected 0x%08x, discarding payload.\n",
376 cmd->init_task_tag, be32_to_cpu(hdr->datasn), data_sn);
380 return DATAOUT_NORMAL;
383 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
384 pr_err("Unable to perform within-command recovery"
386 return DATAOUT_CANNOT_RECOVER;
389 if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
390 return DATAOUT_CANNOT_RECOVER;
392 return DATAOUT_WITHIN_COMMAND_RECOVERY;
395 static int iscsit_dataout_pre_datapduinorder_yes(
396 struct iscsi_cmd *cmd,
399 int dump = 0, recovery = 0;
400 struct iscsi_conn *conn = cmd->conn;
401 struct iscsi_data *hdr = (struct iscsi_data *) buf;
402 u32 payload_length = ntoh24(hdr->dlength);
405 * For DataSequenceInOrder=Yes: If the offset is greater than the global
406 * DataPDUInOrder=Yes offset counter in struct iscsi_cmd a protcol error has
407 * occurred and fail the connection.
409 * For DataSequenceInOrder=No: If the offset is greater than the per
410 * sequence DataPDUInOrder=Yes offset counter in struct iscsi_seq a protocol
411 * error has occurred and fail the connection.
413 if (conn->sess->sess_ops->DataSequenceInOrder) {
414 if (be32_to_cpu(hdr->offset) != cmd->write_data_done) {
415 pr_err("Command ITT: 0x%08x, received offset"
416 " %u different than expected %u.\n", cmd->init_task_tag,
417 be32_to_cpu(hdr->offset), cmd->write_data_done);
422 struct iscsi_seq *seq = cmd->seq_ptr;
424 if (be32_to_cpu(hdr->offset) > seq->offset) {
425 pr_err("Command ITT: 0x%08x, received offset"
426 " %u greater than expected %u.\n", cmd->init_task_tag,
427 be32_to_cpu(hdr->offset), seq->offset);
430 } else if (be32_to_cpu(hdr->offset) < seq->offset) {
431 pr_err("Command ITT: 0x%08x, received offset"
432 " %u less than expected %u, discarding payload.\n",
433 cmd->init_task_tag, be32_to_cpu(hdr->offset),
440 return DATAOUT_NORMAL;
443 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
444 pr_err("Unable to perform within-command recovery"
446 return DATAOUT_CANNOT_RECOVER;
449 if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
450 return DATAOUT_CANNOT_RECOVER;
452 return (recovery) ? iscsit_recover_dataout_sequence(cmd,
453 be32_to_cpu(hdr->offset), payload_length) :
454 (dump) ? DATAOUT_WITHIN_COMMAND_RECOVERY : DATAOUT_NORMAL;
457 static int iscsit_dataout_pre_datapduinorder_no(
458 struct iscsi_cmd *cmd,
461 struct iscsi_pdu *pdu;
462 struct iscsi_data *hdr = (struct iscsi_data *) buf;
463 u32 payload_length = ntoh24(hdr->dlength);
465 pdu = iscsit_get_pdu_holder(cmd, be32_to_cpu(hdr->offset),
468 return DATAOUT_CANNOT_RECOVER;
472 switch (pdu->status) {
473 case ISCSI_PDU_NOT_RECEIVED:
474 case ISCSI_PDU_CRC_FAILED:
475 case ISCSI_PDU_TIMED_OUT:
477 case ISCSI_PDU_RECEIVED_OK:
478 pr_err("Command ITT: 0x%08x received already gotten"
479 " Offset: %u, Length: %u\n", cmd->init_task_tag,
480 be32_to_cpu(hdr->offset), payload_length);
481 return iscsit_dump_data_payload(cmd->conn, payload_length, 1);
483 return DATAOUT_CANNOT_RECOVER;
486 return DATAOUT_NORMAL;
489 static int iscsit_dataout_update_r2t(struct iscsi_cmd *cmd, u32 offset, u32 length)
491 struct iscsi_r2t *r2t;
493 if (cmd->unsolicited_data)
496 r2t = iscsit_get_r2t_for_eos(cmd, offset, length);
500 spin_lock_bh(&cmd->r2t_lock);
501 r2t->seq_complete = 1;
502 cmd->outstanding_r2ts--;
503 spin_unlock_bh(&cmd->r2t_lock);
508 static int iscsit_dataout_update_datapduinorder_no(
509 struct iscsi_cmd *cmd,
514 struct iscsi_pdu *pdu = cmd->pdu_ptr;
516 pdu->data_sn = data_sn;
518 switch (pdu->status) {
519 case ISCSI_PDU_NOT_RECEIVED:
520 pdu->status = ISCSI_PDU_RECEIVED_OK;
522 case ISCSI_PDU_CRC_FAILED:
523 pdu->status = ISCSI_PDU_RECEIVED_OK;
525 case ISCSI_PDU_TIMED_OUT:
526 pdu->status = ISCSI_PDU_RECEIVED_OK;
529 return DATAOUT_CANNOT_RECOVER;
533 ret = iscsit_dataout_datapduinorder_no_fbit(cmd, pdu);
534 if (ret == DATAOUT_CANNOT_RECOVER)
538 return DATAOUT_NORMAL;
541 static int iscsit_dataout_post_crc_passed(
542 struct iscsi_cmd *cmd,
545 int ret, send_r2t = 0;
546 struct iscsi_conn *conn = cmd->conn;
547 struct iscsi_seq *seq = NULL;
548 struct iscsi_data *hdr = (struct iscsi_data *) buf;
549 u32 payload_length = ntoh24(hdr->dlength);
551 if (cmd->unsolicited_data) {
552 if ((cmd->first_burst_len + payload_length) ==
553 conn->sess->sess_ops->FirstBurstLength) {
554 if (iscsit_dataout_update_r2t(cmd, be32_to_cpu(hdr->offset),
556 return DATAOUT_CANNOT_RECOVER;
560 if (!conn->sess->sess_ops->DataPDUInOrder) {
561 ret = iscsit_dataout_update_datapduinorder_no(cmd,
562 be32_to_cpu(hdr->datasn),
563 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
564 if (ret == DATAOUT_CANNOT_RECOVER)
568 cmd->first_burst_len += payload_length;
570 if (conn->sess->sess_ops->DataSequenceInOrder)
575 seq->offset += payload_length;
580 seq->status = DATAOUT_SEQUENCE_COMPLETE;
581 cmd->first_burst_len = 0;
582 cmd->unsolicited_data = 0;
585 if (conn->sess->sess_ops->DataSequenceInOrder) {
586 if ((cmd->next_burst_len + payload_length) ==
587 conn->sess->sess_ops->MaxBurstLength) {
588 if (iscsit_dataout_update_r2t(cmd,
589 be32_to_cpu(hdr->offset),
591 return DATAOUT_CANNOT_RECOVER;
595 if (!conn->sess->sess_ops->DataPDUInOrder) {
596 ret = iscsit_dataout_update_datapduinorder_no(
597 cmd, be32_to_cpu(hdr->datasn),
598 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
599 if (ret == DATAOUT_CANNOT_RECOVER)
603 cmd->next_burst_len += payload_length;
607 cmd->next_burst_len = 0;
611 if ((seq->next_burst_len + payload_length) ==
613 if (iscsit_dataout_update_r2t(cmd,
614 be32_to_cpu(hdr->offset),
616 return DATAOUT_CANNOT_RECOVER;
620 if (!conn->sess->sess_ops->DataPDUInOrder) {
621 ret = iscsit_dataout_update_datapduinorder_no(
622 cmd, be32_to_cpu(hdr->datasn),
623 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
624 if (ret == DATAOUT_CANNOT_RECOVER)
629 seq->offset += payload_length;
630 seq->next_burst_len += payload_length;
633 seq->next_burst_len = 0;
634 seq->status = DATAOUT_SEQUENCE_COMPLETE;
639 if (send_r2t && conn->sess->sess_ops->DataSequenceInOrder)
642 cmd->write_data_done += payload_length;
644 if (cmd->write_data_done == cmd->se_cmd.data_length)
645 return DATAOUT_SEND_TO_TRANSPORT;
647 return DATAOUT_SEND_R2T;
649 return DATAOUT_NORMAL;
652 static int iscsit_dataout_post_crc_failed(
653 struct iscsi_cmd *cmd,
656 struct iscsi_conn *conn = cmd->conn;
657 struct iscsi_pdu *pdu;
658 struct iscsi_data *hdr = (struct iscsi_data *) buf;
659 u32 payload_length = ntoh24(hdr->dlength);
661 if (conn->sess->sess_ops->DataPDUInOrder)
664 * The rest of this function is only called when DataPDUInOrder=No.
668 switch (pdu->status) {
669 case ISCSI_PDU_NOT_RECEIVED:
670 pdu->status = ISCSI_PDU_CRC_FAILED;
672 case ISCSI_PDU_CRC_FAILED:
674 case ISCSI_PDU_TIMED_OUT:
675 pdu->status = ISCSI_PDU_CRC_FAILED;
678 return DATAOUT_CANNOT_RECOVER;
682 return iscsit_recover_dataout_sequence(cmd, be32_to_cpu(hdr->offset),
687 * Called from iscsit_handle_data_out() before DataOUT Payload is received
690 int iscsit_check_pre_dataout(
691 struct iscsi_cmd *cmd,
695 struct iscsi_conn *conn = cmd->conn;
697 ret = iscsit_dataout_within_command_recovery_check(cmd, buf);
698 if ((ret == DATAOUT_WITHIN_COMMAND_RECOVERY) ||
699 (ret == DATAOUT_CANNOT_RECOVER))
702 ret = iscsit_dataout_check_datasn(cmd, buf);
703 if ((ret == DATAOUT_WITHIN_COMMAND_RECOVERY) ||
704 (ret == DATAOUT_CANNOT_RECOVER))
707 if (cmd->unsolicited_data) {
708 ret = iscsit_dataout_check_unsolicited_sequence(cmd, buf);
709 if ((ret == DATAOUT_WITHIN_COMMAND_RECOVERY) ||
710 (ret == DATAOUT_CANNOT_RECOVER))
713 ret = iscsit_dataout_check_sequence(cmd, buf);
714 if ((ret == DATAOUT_WITHIN_COMMAND_RECOVERY) ||
715 (ret == DATAOUT_CANNOT_RECOVER))
719 return (conn->sess->sess_ops->DataPDUInOrder) ?
720 iscsit_dataout_pre_datapduinorder_yes(cmd, buf) :
721 iscsit_dataout_pre_datapduinorder_no(cmd, buf);
725 * Called from iscsit_handle_data_out() after DataOUT Payload is received
728 int iscsit_check_post_dataout(
729 struct iscsi_cmd *cmd,
733 struct iscsi_conn *conn = cmd->conn;
735 cmd->dataout_timeout_retries = 0;
737 if (!data_crc_failed)
738 return iscsit_dataout_post_crc_passed(cmd, buf);
740 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
741 pr_err("Unable to recover from DataOUT CRC"
742 " failure while ERL=0, closing session.\n");
743 iscsit_reject_cmd(cmd, ISCSI_REASON_DATA_DIGEST_ERROR,
745 return DATAOUT_CANNOT_RECOVER;
748 iscsit_reject_cmd(cmd, ISCSI_REASON_DATA_DIGEST_ERROR, buf);
749 return iscsit_dataout_post_crc_failed(cmd, buf);
753 static void iscsit_handle_time2retain_timeout(unsigned long data)
755 struct iscsi_session *sess = (struct iscsi_session *) data;
756 struct iscsi_portal_group *tpg = sess->tpg;
757 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
759 spin_lock_bh(&se_tpg->session_lock);
760 if (sess->time2retain_timer_flags & ISCSI_TF_STOP) {
761 spin_unlock_bh(&se_tpg->session_lock);
764 if (atomic_read(&sess->session_reinstatement)) {
765 pr_err("Exiting Time2Retain handler because"
766 " session_reinstatement=1\n");
767 spin_unlock_bh(&se_tpg->session_lock);
770 sess->time2retain_timer_flags |= ISCSI_TF_EXPIRED;
772 pr_err("Time2Retain timer expired for SID: %u, cleaning up"
773 " iSCSI session.\n", sess->sid);
775 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
778 spin_lock(&tiqn->sess_err_stats.lock);
779 strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
780 (void *)sess->sess_ops->InitiatorName);
781 tiqn->sess_err_stats.last_sess_failure_type =
782 ISCSI_SESS_ERR_CXN_TIMEOUT;
783 tiqn->sess_err_stats.cxn_timeout_errors++;
784 atomic_long_inc(&sess->conn_timeout_errors);
785 spin_unlock(&tiqn->sess_err_stats.lock);
789 spin_unlock_bh(&se_tpg->session_lock);
790 target_put_session(sess->se_sess);
793 void iscsit_start_time2retain_handler(struct iscsi_session *sess)
797 * Only start Time2Retain timer when the associated TPG is still in
798 * an ACTIVE (eg: not disabled or shutdown) state.
800 spin_lock(&sess->tpg->tpg_state_lock);
801 tpg_active = (sess->tpg->tpg_state == TPG_STATE_ACTIVE);
802 spin_unlock(&sess->tpg->tpg_state_lock);
807 if (sess->time2retain_timer_flags & ISCSI_TF_RUNNING)
810 pr_debug("Starting Time2Retain timer for %u seconds on"
811 " SID: %u\n", sess->sess_ops->DefaultTime2Retain, sess->sid);
813 init_timer(&sess->time2retain_timer);
814 sess->time2retain_timer.expires =
815 (get_jiffies_64() + sess->sess_ops->DefaultTime2Retain * HZ);
816 sess->time2retain_timer.data = (unsigned long)sess;
817 sess->time2retain_timer.function = iscsit_handle_time2retain_timeout;
818 sess->time2retain_timer_flags &= ~ISCSI_TF_STOP;
819 sess->time2retain_timer_flags |= ISCSI_TF_RUNNING;
820 add_timer(&sess->time2retain_timer);
824 * Called with spin_lock_bh(&struct se_portal_group->session_lock) held
826 int iscsit_stop_time2retain_timer(struct iscsi_session *sess)
828 struct iscsi_portal_group *tpg = sess->tpg;
829 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
831 if (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)
834 if (!(sess->time2retain_timer_flags & ISCSI_TF_RUNNING))
837 sess->time2retain_timer_flags |= ISCSI_TF_STOP;
838 spin_unlock(&se_tpg->session_lock);
840 del_timer_sync(&sess->time2retain_timer);
842 spin_lock(&se_tpg->session_lock);
843 sess->time2retain_timer_flags &= ~ISCSI_TF_RUNNING;
844 pr_debug("Stopped Time2Retain Timer for SID: %u\n",
849 void iscsit_connection_reinstatement_rcfr(struct iscsi_conn *conn)
851 spin_lock_bh(&conn->state_lock);
852 if (atomic_read(&conn->connection_exit)) {
853 spin_unlock_bh(&conn->state_lock);
857 if (atomic_read(&conn->transport_failed)) {
858 spin_unlock_bh(&conn->state_lock);
861 spin_unlock_bh(&conn->state_lock);
863 iscsi_thread_set_force_reinstatement(conn);
866 wait_for_completion(&conn->conn_wait_rcfr_comp);
867 complete(&conn->conn_post_wait_comp);
870 void iscsit_cause_connection_reinstatement(struct iscsi_conn *conn, int sleep)
872 spin_lock_bh(&conn->state_lock);
873 if (atomic_read(&conn->connection_exit)) {
874 spin_unlock_bh(&conn->state_lock);
878 if (atomic_read(&conn->transport_failed)) {
879 spin_unlock_bh(&conn->state_lock);
883 if (atomic_read(&conn->connection_reinstatement)) {
884 spin_unlock_bh(&conn->state_lock);
888 if (iscsi_thread_set_force_reinstatement(conn) < 0) {
889 spin_unlock_bh(&conn->state_lock);
893 atomic_set(&conn->connection_reinstatement, 1);
895 spin_unlock_bh(&conn->state_lock);
899 atomic_set(&conn->sleep_on_conn_wait_comp, 1);
900 spin_unlock_bh(&conn->state_lock);
902 wait_for_completion(&conn->conn_wait_comp);
903 complete(&conn->conn_post_wait_comp);
905 EXPORT_SYMBOL(iscsit_cause_connection_reinstatement);
907 void iscsit_fall_back_to_erl0(struct iscsi_session *sess)
909 pr_debug("Falling back to ErrorRecoveryLevel=0 for SID:"
912 atomic_set(&sess->session_fall_back_to_erl0, 1);
915 static void iscsit_handle_connection_cleanup(struct iscsi_conn *conn)
917 struct iscsi_session *sess = conn->sess;
919 if ((sess->sess_ops->ErrorRecoveryLevel == 2) &&
920 !atomic_read(&sess->session_reinstatement) &&
921 !atomic_read(&sess->session_fall_back_to_erl0))
922 iscsit_connection_recovery_transport_reset(conn);
924 pr_debug("Performing cleanup for failed iSCSI"
925 " Connection ID: %hu from %s\n", conn->cid,
926 sess->sess_ops->InitiatorName);
927 iscsit_close_connection(conn);
931 void iscsit_take_action_for_connection_exit(struct iscsi_conn *conn)
933 spin_lock_bh(&conn->state_lock);
934 if (atomic_read(&conn->connection_exit)) {
935 spin_unlock_bh(&conn->state_lock);
938 atomic_set(&conn->connection_exit, 1);
940 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT) {
941 spin_unlock_bh(&conn->state_lock);
942 iscsit_close_connection(conn);
946 if (conn->conn_state == TARG_CONN_STATE_CLEANUP_WAIT) {
947 spin_unlock_bh(&conn->state_lock);
951 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
952 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
953 spin_unlock_bh(&conn->state_lock);
955 iscsit_handle_connection_cleanup(conn);
959 * This is the simple function that makes the magic of
960 * sync and steering happen in the follow paradoxical order:
962 * 0) Receive conn->of_marker (bytes left until next OFMarker)
963 * bytes into an offload buffer. When we pass the exact number
964 * of bytes in conn->of_marker, iscsit_dump_data_payload() and hence
965 * rx_data() will automatically receive the identical u32 marker
966 * values and store it in conn->of_marker_offset;
967 * 1) Now conn->of_marker_offset will contain the offset to the start
968 * of the next iSCSI PDU. Dump these remaining bytes into another
971 * Next byte in the TCP stream will contain the next iSCSI PDU!
974 int iscsit_recover_from_unknown_opcode(struct iscsi_conn *conn)
977 * Make sure the remaining bytes to next maker is a sane value.
979 if (conn->of_marker > (conn->conn_ops->OFMarkInt * 4)) {
980 pr_err("Remaining bytes to OFMarker: %u exceeds"
981 " OFMarkInt bytes: %u.\n", conn->of_marker,
982 conn->conn_ops->OFMarkInt * 4);
986 pr_debug("Advancing %u bytes in TCP stream to get to the"
987 " next OFMarker.\n", conn->of_marker);
989 if (iscsit_dump_data_payload(conn, conn->of_marker, 0) < 0)
993 * Make sure the offset marker we retrived is a valid value.
995 if (conn->of_marker_offset > (ISCSI_HDR_LEN + (ISCSI_CRC_LEN * 2) +
996 conn->conn_ops->MaxRecvDataSegmentLength)) {
997 pr_err("OfMarker offset value: %u exceeds limit.\n",
998 conn->of_marker_offset);
1002 pr_debug("Discarding %u bytes of TCP stream to get to the"
1003 " next iSCSI Opcode.\n", conn->of_marker_offset);
1005 if (iscsit_dump_data_payload(conn, conn->of_marker_offset, 0) < 0)