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 "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)