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target: iscsi: fix comment typos in target/iscsi drivers
[linux-block.git] / drivers / target / iscsi / iscsi_target_erl0.c
CommitLineData
e48354ce
NB		 1/******************************************************************************
2 * This file contains error recovery level zero functions used by
3 * the iSCSI Target driver.
4 *
5 * \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
6 *
7 * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
8 *
9 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
10 *
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.
15 *
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 ******************************************************************************/
21
22#include <scsi/iscsi_proto.h>
23#include <target/target_core_base.h>
c4795fb2 24#include <target/target_core_fabric.h>
e48354ce
NB		 25
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"
34
35/*
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.
39 */
40void iscsit_set_dataout_sequence_values(
41 struct iscsi_cmd *cmd)
42{
43 struct iscsi_conn *conn = cmd->conn;
44 /*
45 * Still set seq_start_offset and seq_end_offset for Unsolicited
46 * DataOUT, even if DataSequenceInOrder=No.
47 */
48 if (cmd->unsolicited_data) {
49 cmd->seq_start_offset = cmd->write_data_done;
50 cmd->seq_end_offset = (cmd->write_data_done +
d7ca663c
DC		 51 ((cmd->se_cmd.data_length >
52 conn->sess->sess_ops->FirstBurstLength) ?
53 conn->sess->sess_ops->FirstBurstLength : cmd->se_cmd.data_length));
e48354ce
NB		 54 return;
55 }
56
57 if (!conn->sess->sess_ops->DataSequenceInOrder)
58 return;
59
60 if (!cmd->seq_start_offset && !cmd->seq_end_offset) {
61 cmd->seq_start_offset = cmd->write_data_done;
ebf1d95c 62 cmd->seq_end_offset = (cmd->se_cmd.data_length >
e48354ce
NB		 63 conn->sess->sess_ops->MaxBurstLength) ?
64 (cmd->write_data_done +
ebf1d95c 65 conn->sess->sess_ops->MaxBurstLength) : cmd->se_cmd.data_length;
e48354ce
NB		 66 } else {
67 cmd->seq_start_offset = cmd->seq_end_offset;
68 cmd->seq_end_offset = ((cmd->seq_end_offset +
69 conn->sess->sess_ops->MaxBurstLength) >=
ebf1d95c 70 cmd->se_cmd.data_length) ? cmd->se_cmd.data_length :
e48354ce
NB		 71 (cmd->seq_end_offset +
72 conn->sess->sess_ops->MaxBurstLength);
73 }
74}
75
76static int iscsit_dataout_within_command_recovery_check(
77 struct iscsi_cmd *cmd,
78 unsigned char *buf)
79{
80 struct iscsi_conn *conn = cmd->conn;
81 struct iscsi_data *hdr = (struct iscsi_data *) buf;
82 u32 payload_length = ntoh24(hdr->dlength);
83
84 /*
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,
89 * dump the payload.
90 *
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.
95 */
96 if (conn->sess->sess_ops->DataSequenceInOrder) {
97 if ((cmd->cmd_flags & ICF_WITHIN_COMMAND_RECOVERY) &&
50e5c87d 98 cmd->write_data_done != be32_to_cpu(hdr->offset))
e48354ce
NB		 99 goto dump;
100
101 cmd->cmd_flags &= ~ICF_WITHIN_COMMAND_RECOVERY;
102 } else {
103 struct iscsi_seq *seq;
104
50e5c87d
CH		 105 seq = iscsit_get_seq_holder(cmd, be32_to_cpu(hdr->offset),
106 payload_length);
e48354ce
NB		 107 if (!seq)
108 return DATAOUT_CANNOT_RECOVER;
109 /*
110 * Set the struct iscsi_seq pointer to reuse later.
111 */
112 cmd->seq_ptr = seq;
113
114 if (conn->sess->sess_ops->DataPDUInOrder) {
50e5c87d
CH		 115 if (seq->status ==
116 DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY &&
117 (seq->offset != be32_to_cpu(hdr->offset) ||
118 seq->data_sn != be32_to_cpu(hdr->datasn)))
e48354ce
NB		 119 goto dump;
120 } else {
50e5c87d
CH		 121 if (seq->status ==
122 DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY &&
123 seq->data_sn != be32_to_cpu(hdr->datasn))
e48354ce
NB		 124 goto dump;
125 }
126
127 if (seq->status == DATAOUT_SEQUENCE_COMPLETE)
128 goto dump;
129
130 if (seq->status != DATAOUT_SEQUENCE_COMPLETE)
131 seq->status = 0;
132 }
133
134 return DATAOUT_NORMAL;
135
136dump:
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);
140}
141
142static int iscsit_dataout_check_unsolicited_sequence(
143 struct iscsi_cmd *cmd,
144 unsigned char *buf)
145{
146 u32 first_burst_len;
147 struct iscsi_conn *conn = cmd->conn;
148 struct iscsi_data *hdr = (struct iscsi_data *) buf;
149 u32 payload_length = ntoh24(hdr->dlength);
150
151
50e5c87d
CH		 152 if ((be32_to_cpu(hdr->offset) < cmd->seq_start_offset) ||
153 ((be32_to_cpu(hdr->offset) + payload_length) > cmd->seq_end_offset)) {
e48354ce
NB		 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,
50e5c87d 157 be32_to_cpu(hdr->offset), payload_length, cmd->seq_start_offset,
e48354ce
NB		 158 cmd->seq_end_offset);
159 return DATAOUT_CANNOT_RECOVER;
160 }
161
162 first_burst_len = (cmd->first_burst_len + payload_length);
163
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;
171 }
172
173 /*
174 * Perform various MaxBurstLength and ISCSI_FLAG_CMD_FINAL sanity
175 * checks for the current Unsolicited DataOUT Sequence.
176 */
177 if (hdr->flags & ISCSI_FLAG_CMD_FINAL) {
178 /*
179 * Ignore ISCSI_FLAG_CMD_FINAL checks while DataPDUInOrder=No, end of
180 * sequence checks are handled in
181 * iscsit_dataout_datapduinorder_no_fbit().
182 */
183 if (!conn->sess->sess_ops->DataPDUInOrder)
184 goto out;
185
ebf1d95c 186 if ((first_burst_len != cmd->se_cmd.data_length) &&
e48354ce
NB		 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,
ebf1d95c 192 cmd->se_cmd.data_length);
e48354ce
NB		 193 transport_send_check_condition_and_sense(&cmd->se_cmd,
194 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
195 return DATAOUT_CANNOT_RECOVER;
196 }
197 } else {
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;
204 }
ebf1d95c 205 if (first_burst_len == cmd->se_cmd.data_length) {
e48354ce
NB		 206 pr_err("Command ITT: 0x%08x reached"
207 " ExpXferLen: %u, but ISCSI_FLAG_CMD_FINAL is not set. protocol"
ebf1d95c 208 " error.\n", cmd->init_task_tag, cmd->se_cmd.data_length);
e48354ce
NB		 209 return DATAOUT_CANNOT_RECOVER;
210 }
211 }
212
213out:
214 return DATAOUT_NORMAL;
215}
216
217static int iscsit_dataout_check_sequence(
218 struct iscsi_cmd *cmd,
219 unsigned char *buf)
220{
221 u32 next_burst_len;
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);
226
227 /*
228 * For DataSequenceInOrder=Yes: Check that the offset and offset+length
229 * is within range as defined by iscsi_set_dataout_sequence_values().
230 *
231 * For DataSequenceInOrder=No: Check that an struct iscsi_seq exists for
232 * offset+length tuple.
233 */
234 if (conn->sess->sess_ops->DataSequenceInOrder) {
235 /*
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.
239 */
50e5c87d
CH		 240 if ((be32_to_cpu(hdr->offset) < cmd->seq_start_offset) ||
241 ((be32_to_cpu(hdr->offset) + payload_length) > cmd->seq_end_offset)) {
e48354ce
NB		 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,
50e5c87d 245 be32_to_cpu(hdr->offset), payload_length, cmd->seq_start_offset,
e48354ce
NB		 246 cmd->seq_end_offset);
247
248 if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
249 return DATAOUT_CANNOT_RECOVER;
250 return DATAOUT_WITHIN_COMMAND_RECOVERY;
251 }
252
253 next_burst_len = (cmd->next_burst_len + payload_length);
254 } else {
50e5c87d
CH		 255 seq = iscsit_get_seq_holder(cmd, be32_to_cpu(hdr->offset),
256 payload_length);
e48354ce
NB		 257 if (!seq)
258 return DATAOUT_CANNOT_RECOVER;
259 /*
260 * Set the struct iscsi_seq pointer to reuse later.
261 */
262 cmd->seq_ptr = seq;
263
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;
268 }
269
270 next_burst_len = (seq->next_burst_len + payload_length);
271 }
272
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;
280 }
281
282 /*
283 * Perform various MaxBurstLength and ISCSI_FLAG_CMD_FINAL sanity
284 * checks for the current DataOUT Sequence.
285 */
286 if (hdr->flags & ISCSI_FLAG_CMD_FINAL) {
287 /*
288 * Ignore ISCSI_FLAG_CMD_FINAL checks while DataPDUInOrder=No, end of
289 * sequence checks are handled in
290 * iscsit_dataout_datapduinorder_no_fbit().
291 */
292 if (!conn->sess->sess_ops->DataPDUInOrder)
293 goto out;
294
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) <
ebf1d95c 299 cmd->se_cmd.data_length)) {
e48354ce
NB		 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;
304 }
305 } else {
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;
311 }
312 }
313 } else {
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;
322 }
323 if ((cmd->write_data_done + payload_length) ==
ebf1d95c 324 cmd->se_cmd.data_length) {
e48354ce
NB		 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",
328 cmd->init_task_tag);
329 return DATAOUT_CANNOT_RECOVER;
330 }
331 } else {
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",
336 cmd->init_task_tag);
337 return DATAOUT_CANNOT_RECOVER;
338 }
339 }
340 }
341
342out:
343 return DATAOUT_NORMAL;
344}
345
346static int iscsit_dataout_check_datasn(
347 struct iscsi_cmd *cmd,
348 unsigned char *buf)
349{
350 int dump = 0, recovery = 0;
351 u32 data_sn = 0;
352 struct iscsi_conn *conn = cmd->conn;
353 struct iscsi_data *hdr = (struct iscsi_data *) buf;
354 u32 payload_length = ntoh24(hdr->dlength);
355
356 /*
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
360 * handle it.
361 *
362 * If the DataSN is less than expected, dump the payload.
363 */
364 if (conn->sess->sess_ops->DataSequenceInOrder)
365 data_sn = cmd->data_sn;
366 else {
367 struct iscsi_seq *seq = cmd->seq_ptr;
368 data_sn = seq->data_sn;
369 }
370
50e5c87d 371 if (be32_to_cpu(hdr->datasn) > data_sn) {
e48354ce
NB		 372 pr_err("Command ITT: 0x%08x, received DataSN: 0x%08x"
373 " higher than expected 0x%08x.\n", cmd->init_task_tag,
50e5c87d 374 be32_to_cpu(hdr->datasn), data_sn);
e48354ce
NB		 375 recovery = 1;
376 goto recover;
50e5c87d 377 } else if (be32_to_cpu(hdr->datasn) < data_sn) {
e48354ce
NB		 378 pr_err("Command ITT: 0x%08x, received DataSN: 0x%08x"
379 " lower than expected 0x%08x, discarding payload.\n",
50e5c87d 380 cmd->init_task_tag, be32_to_cpu(hdr->datasn), data_sn);
e48354ce
NB		 381 dump = 1;
382 goto dump;
383 }
384
385 return DATAOUT_NORMAL;
386
387recover:
388 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
389 pr_err("Unable to perform within-command recovery"
390 " while ERL=0.\n");
391 return DATAOUT_CANNOT_RECOVER;
392 }
393dump:
394 if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
395 return DATAOUT_CANNOT_RECOVER;
396
397 return (recovery || dump) ? DATAOUT_WITHIN_COMMAND_RECOVERY :
398 DATAOUT_NORMAL;
399}
400
401static int iscsit_dataout_pre_datapduinorder_yes(
402 struct iscsi_cmd *cmd,
403 unsigned char *buf)
404{
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);
409
410 /*
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
20879696 413 * occurred and fail the connection.
e48354ce
NB		 414 *
415 * For DataSequenceInOrder=No: If the offset is greater than the per
416 * sequence DataPDUInOrder=Yes offset counter in struct iscsi_seq a protocol
20879696 417 * error has occurred and fail the connection.
e48354ce
NB		 418 */
419 if (conn->sess->sess_ops->DataSequenceInOrder) {
50e5c87d 420 if (be32_to_cpu(hdr->offset) != cmd->write_data_done) {
e48354ce
NB		 421 pr_err("Command ITT: 0x%08x, received offset"
422 " %u different than expected %u.\n", cmd->init_task_tag,
50e5c87d 423 be32_to_cpu(hdr->offset), cmd->write_data_done);
e48354ce
NB		 424 recovery = 1;
425 goto recover;
426 }
427 } else {
428 struct iscsi_seq *seq = cmd->seq_ptr;
429
50e5c87d 430 if (be32_to_cpu(hdr->offset) > seq->offset) {
e48354ce
NB		 431 pr_err("Command ITT: 0x%08x, received offset"
432 " %u greater than expected %u.\n", cmd->init_task_tag,
50e5c87d 433 be32_to_cpu(hdr->offset), seq->offset);
e48354ce
NB		 434 recovery = 1;
435 goto recover;
50e5c87d 436 } else if (be32_to_cpu(hdr->offset) < seq->offset) {
e48354ce
NB		 437 pr_err("Command ITT: 0x%08x, received offset"
438 " %u less than expected %u, discarding payload.\n",
50e5c87d
CH		 439 cmd->init_task_tag, be32_to_cpu(hdr->offset),
440 seq->offset);
e48354ce
NB		 441 dump = 1;
442 goto dump;
443 }
444 }
445
446 return DATAOUT_NORMAL;
447
448recover:
449 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
450 pr_err("Unable to perform within-command recovery"
451 " while ERL=0.\n");
452 return DATAOUT_CANNOT_RECOVER;
453 }
454dump:
455 if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
456 return DATAOUT_CANNOT_RECOVER;
457
458 return (recovery) ? iscsit_recover_dataout_sequence(cmd,
50e5c87d 459 be32_to_cpu(hdr->offset), payload_length) :
e48354ce
NB		 460 (dump) ? DATAOUT_WITHIN_COMMAND_RECOVERY : DATAOUT_NORMAL;
461}
462
463static int iscsit_dataout_pre_datapduinorder_no(
464 struct iscsi_cmd *cmd,
465 unsigned char *buf)
466{
467 struct iscsi_pdu *pdu;
468 struct iscsi_data *hdr = (struct iscsi_data *) buf;
469 u32 payload_length = ntoh24(hdr->dlength);
470
50e5c87d
CH		 471 pdu = iscsit_get_pdu_holder(cmd, be32_to_cpu(hdr->offset),
472 payload_length);
e48354ce
NB		 473 if (!pdu)
474 return DATAOUT_CANNOT_RECOVER;
475
476 cmd->pdu_ptr = pdu;
477
478 switch (pdu->status) {
479 case ISCSI_PDU_NOT_RECEIVED:
480 case ISCSI_PDU_CRC_FAILED:
481 case ISCSI_PDU_TIMED_OUT:
482 break;
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,
50e5c87d 486 be32_to_cpu(hdr->offset), payload_length);
e48354ce
NB		 487 return iscsit_dump_data_payload(cmd->conn, payload_length, 1);
488 default:
489 return DATAOUT_CANNOT_RECOVER;
490 }
491
492 return DATAOUT_NORMAL;
493}
494
495static int iscsit_dataout_update_r2t(struct iscsi_cmd *cmd, u32 offset, u32 length)
496{
497 struct iscsi_r2t *r2t;
498
499 if (cmd->unsolicited_data)
500 return 0;
501
502 r2t = iscsit_get_r2t_for_eos(cmd, offset, length);
503 if (!r2t)
504 return -1;
505
506 spin_lock_bh(&cmd->r2t_lock);
507 r2t->seq_complete = 1;
508 cmd->outstanding_r2ts--;
509 spin_unlock_bh(&cmd->r2t_lock);
510
511 return 0;
512}
513
514static int iscsit_dataout_update_datapduinorder_no(
515 struct iscsi_cmd *cmd,
516 u32 data_sn,
517 int f_bit)
518{
519 int ret = 0;
520 struct iscsi_pdu *pdu = cmd->pdu_ptr;
521
522 pdu->data_sn = data_sn;
523
524 switch (pdu->status) {
525 case ISCSI_PDU_NOT_RECEIVED:
526 pdu->status = ISCSI_PDU_RECEIVED_OK;
527 break;
528 case ISCSI_PDU_CRC_FAILED:
529 pdu->status = ISCSI_PDU_RECEIVED_OK;
530 break;
531 case ISCSI_PDU_TIMED_OUT:
532 pdu->status = ISCSI_PDU_RECEIVED_OK;
533 break;
534 default:
535 return DATAOUT_CANNOT_RECOVER;
536 }
537
538 if (f_bit) {
539 ret = iscsit_dataout_datapduinorder_no_fbit(cmd, pdu);
540 if (ret == DATAOUT_CANNOT_RECOVER)
541 return ret;
542 }
543
544 return DATAOUT_NORMAL;
545}
546
547static int iscsit_dataout_post_crc_passed(
548 struct iscsi_cmd *cmd,
549 unsigned char *buf)
550{
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);
556
557 if (cmd->unsolicited_data) {
558 if ((cmd->first_burst_len + payload_length) ==
559 conn->sess->sess_ops->FirstBurstLength) {
50e5c87d 560 if (iscsit_dataout_update_r2t(cmd, be32_to_cpu(hdr->offset),
e48354ce
NB		 561 payload_length) < 0)
562 return DATAOUT_CANNOT_RECOVER;
563 send_r2t = 1;
564 }
565
566 if (!conn->sess->sess_ops->DataPDUInOrder) {
567 ret = iscsit_dataout_update_datapduinorder_no(cmd,
50e5c87d
CH		 568 be32_to_cpu(hdr->datasn),
569 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
e48354ce
NB		 570 if (ret == DATAOUT_CANNOT_RECOVER)
571 return ret;
572 }
573
574 cmd->first_burst_len += payload_length;
575
576 if (conn->sess->sess_ops->DataSequenceInOrder)
577 cmd->data_sn++;
578 else {
579 seq = cmd->seq_ptr;
580 seq->data_sn++;
581 seq->offset += payload_length;
582 }
583
584 if (send_r2t) {
585 if (seq)
586 seq->status = DATAOUT_SEQUENCE_COMPLETE;
587 cmd->first_burst_len = 0;
588 cmd->unsolicited_data = 0;
589 }
590 } else {
591 if (conn->sess->sess_ops->DataSequenceInOrder) {
592 if ((cmd->next_burst_len + payload_length) ==
593 conn->sess->sess_ops->MaxBurstLength) {
50e5c87d
CH		 594 if (iscsit_dataout_update_r2t(cmd,
595 be32_to_cpu(hdr->offset),
e48354ce
NB		 596 payload_length) < 0)
597 return DATAOUT_CANNOT_RECOVER;
598 send_r2t = 1;
599 }
600
601 if (!conn->sess->sess_ops->DataPDUInOrder) {
602 ret = iscsit_dataout_update_datapduinorder_no(
50e5c87d 603 cmd, be32_to_cpu(hdr->datasn),
e48354ce
NB		 604 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
605 if (ret == DATAOUT_CANNOT_RECOVER)
606 return ret;
607 }
608
609 cmd->next_burst_len += payload_length;
610 cmd->data_sn++;
611
612 if (send_r2t)
613 cmd->next_burst_len = 0;
614 } else {
615 seq = cmd->seq_ptr;
616
617 if ((seq->next_burst_len + payload_length) ==
618 seq->xfer_len) {
50e5c87d
CH		 619 if (iscsit_dataout_update_r2t(cmd,
620 be32_to_cpu(hdr->offset),
e48354ce
NB		 621 payload_length) < 0)
622 return DATAOUT_CANNOT_RECOVER;
623 send_r2t = 1;
624 }
625
626 if (!conn->sess->sess_ops->DataPDUInOrder) {
627 ret = iscsit_dataout_update_datapduinorder_no(
50e5c87d 628 cmd, be32_to_cpu(hdr->datasn),
e48354ce
NB		 629 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
630 if (ret == DATAOUT_CANNOT_RECOVER)
631 return ret;
632 }
633
634 seq->data_sn++;
635 seq->offset += payload_length;
636 seq->next_burst_len += payload_length;
637
638 if (send_r2t) {
639 seq->next_burst_len = 0;
640 seq->status = DATAOUT_SEQUENCE_COMPLETE;
641 }
642 }
643 }
644
645 if (send_r2t && conn->sess->sess_ops->DataSequenceInOrder)
646 cmd->data_sn = 0;
647
648 cmd->write_data_done += payload_length;
649
ebf1d95c 650 if (cmd->write_data_done == cmd->se_cmd.data_length)
c6037cc5
AG		 651 return DATAOUT_SEND_TO_TRANSPORT;
652 else if (send_r2t)
653 return DATAOUT_SEND_R2T;
654 else
655 return DATAOUT_NORMAL;
e48354ce
NB		 656}
657
658static int iscsit_dataout_post_crc_failed(
659 struct iscsi_cmd *cmd,
660 unsigned char *buf)
661{
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);
666
667 if (conn->sess->sess_ops->DataPDUInOrder)
668 goto recover;
669 /*
670 * The rest of this function is only called when DataPDUInOrder=No.
671 */
672 pdu = cmd->pdu_ptr;
673
674 switch (pdu->status) {
675 case ISCSI_PDU_NOT_RECEIVED:
676 pdu->status = ISCSI_PDU_CRC_FAILED;
677 break;
678 case ISCSI_PDU_CRC_FAILED:
679 break;
680 case ISCSI_PDU_TIMED_OUT:
681 pdu->status = ISCSI_PDU_CRC_FAILED;
682 break;
683 default:
684 return DATAOUT_CANNOT_RECOVER;
685 }
686
687recover:
50e5c87d
CH		 688 return iscsit_recover_dataout_sequence(cmd, be32_to_cpu(hdr->offset),
689 payload_length);
e48354ce
NB		 690}
691
692/*
693 * Called from iscsit_handle_data_out() before DataOUT Payload is received
694 * and CRC computed.
695 */
fceb5bc7 696int iscsit_check_pre_dataout(
e48354ce
NB		 697 struct iscsi_cmd *cmd,
698 unsigned char *buf)
699{
700 int ret;
701 struct iscsi_conn *conn = cmd->conn;
702
703 ret = iscsit_dataout_within_command_recovery_check(cmd, buf);
704 if ((ret == DATAOUT_WITHIN_COMMAND_RECOVERY) ||
705 (ret == DATAOUT_CANNOT_RECOVER))
706 return ret;
707
708 ret = iscsit_dataout_check_datasn(cmd, buf);
709 if ((ret == DATAOUT_WITHIN_COMMAND_RECOVERY) ||
710 (ret == DATAOUT_CANNOT_RECOVER))
711 return ret;
712
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))
717 return ret;
718 } else {
719 ret = iscsit_dataout_check_sequence(cmd, buf);
720 if ((ret == DATAOUT_WITHIN_COMMAND_RECOVERY) ||
721 (ret == DATAOUT_CANNOT_RECOVER))
722 return ret;
723 }
724
725 return (conn->sess->sess_ops->DataPDUInOrder) ?
726 iscsit_dataout_pre_datapduinorder_yes(cmd, buf) :
727 iscsit_dataout_pre_datapduinorder_no(cmd, buf);
728}
729
730/*
731 * Called from iscsit_handle_data_out() after DataOUT Payload is received
732 * and CRC computed.
733 */
734int iscsit_check_post_dataout(
735 struct iscsi_cmd *cmd,
736 unsigned char *buf,
737 u8 data_crc_failed)
738{
739 struct iscsi_conn *conn = cmd->conn;
740
741 cmd->dataout_timeout_retries = 0;
742
743 if (!data_crc_failed)
744 return iscsit_dataout_post_crc_passed(cmd, buf);
745 else {
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,
750 1, 0, buf, cmd);
751 return DATAOUT_CANNOT_RECOVER;
752 }
753
754 iscsit_add_reject_from_cmd(ISCSI_REASON_DATA_DIGEST_ERROR,
755 0, 0, buf, cmd);
756 return iscsit_dataout_post_crc_failed(cmd, buf);
757 }
758}
759
760static void iscsit_handle_time2retain_timeout(unsigned long data)
761{
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;
765
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);
769 return;
770 }
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);
775 return;
776 }
777 sess->time2retain_timer_flags |= ISCSI_TF_EXPIRED;
778
779 pr_err("Time2Retain timer expired for SID: %u, cleaning up"
780 " iSCSI session.\n", sess->sid);
781 {
782 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
783
784 if (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);
793 }
794 }
795
796 spin_unlock_bh(&se_tpg->session_lock);
99367f01 797 target_put_session(sess->se_sess);
e48354ce
NB		 798}
799
fceb5bc7 800void iscsit_start_time2retain_handler(struct iscsi_session *sess)
e48354ce
NB		 801{
802 int tpg_active;
803 /*
20879696 804 * Only start Time2Retain timer when the associated TPG is still in
e48354ce
NB		 805 * an ACTIVE (eg: not disabled or shutdown) state.
806 */
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);
810
811 if (!tpg_active)
812 return;
813
814 if (sess->time2retain_timer_flags & ISCSI_TF_RUNNING)
815 return;
816
817 pr_debug("Starting Time2Retain timer for %u seconds on"
818 " SID: %u\n", sess->sess_ops->DefaultTime2Retain, sess->sid);
819
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);
828}
829
830/*
831 * Called with spin_lock_bh(&struct se_portal_group->session_lock) held
832 */
fceb5bc7 833int iscsit_stop_time2retain_timer(struct iscsi_session *sess)
e48354ce
NB		 834{
835 struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
836 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
837
838 if (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)
839 return -1;
840
841 if (!(sess->time2retain_timer_flags & ISCSI_TF_RUNNING))
842 return 0;
843
844 sess->time2retain_timer_flags |= ISCSI_TF_STOP;
845 spin_unlock_bh(&se_tpg->session_lock);
846
847 del_timer_sync(&sess->time2retain_timer);
848
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",
852 sess->sid);
853 return 0;
854}
855
856void iscsit_connection_reinstatement_rcfr(struct iscsi_conn *conn)
857{
858 spin_lock_bh(&conn->state_lock);
859 if (atomic_read(&conn->connection_exit)) {
860 spin_unlock_bh(&conn->state_lock);
861 goto sleep;
862 }
863
864 if (atomic_read(&conn->transport_failed)) {
865 spin_unlock_bh(&conn->state_lock);
866 goto sleep;
867 }
868 spin_unlock_bh(&conn->state_lock);
869
870 iscsi_thread_set_force_reinstatement(conn);
871
872sleep:
873 wait_for_completion(&conn->conn_wait_rcfr_comp);
874 complete(&conn->conn_post_wait_comp);
875}
876
877void iscsit_cause_connection_reinstatement(struct iscsi_conn *conn, int sleep)
878{
879 spin_lock_bh(&conn->state_lock);
880 if (atomic_read(&conn->connection_exit)) {
881 spin_unlock_bh(&conn->state_lock);
882 return;
883 }
884
885 if (atomic_read(&conn->transport_failed)) {
886 spin_unlock_bh(&conn->state_lock);
887 return;
888 }
889
890 if (atomic_read(&conn->connection_reinstatement)) {
891 spin_unlock_bh(&conn->state_lock);
892 return;
893 }
894
895 if (iscsi_thread_set_force_reinstatement(conn) < 0) {
896 spin_unlock_bh(&conn->state_lock);
897 return;
898 }
899
900 atomic_set(&conn->connection_reinstatement, 1);
901 if (!sleep) {
902 spin_unlock_bh(&conn->state_lock);
903 return;
904 }
905
906 atomic_set(&conn->sleep_on_conn_wait_comp, 1);
907 spin_unlock_bh(&conn->state_lock);
908
909 wait_for_completion(&conn->conn_wait_comp);
910 complete(&conn->conn_post_wait_comp);
911}
912
913void iscsit_fall_back_to_erl0(struct iscsi_session *sess)
914{
915 pr_debug("Falling back to ErrorRecoveryLevel=0 for SID:"
916 " %u\n", sess->sid);
917
918 atomic_set(&sess->session_fall_back_to_erl0, 1);
919}
920
921static void iscsit_handle_connection_cleanup(struct iscsi_conn *conn)
922{
923 struct iscsi_session *sess = conn->sess;
924
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);
929 else {
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);
934 }
935}
936
fceb5bc7 937void iscsit_take_action_for_connection_exit(struct iscsi_conn *conn)
e48354ce
NB		 938{
939 spin_lock_bh(&conn->state_lock);
940 if (atomic_read(&conn->connection_exit)) {
941 spin_unlock_bh(&conn->state_lock);
942 return;
943 }
944 atomic_set(&conn->connection_exit, 1);
945
946 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT) {
947 spin_unlock_bh(&conn->state_lock);
948 iscsit_close_connection(conn);
949 return;
950 }
951
952 if (conn->conn_state == TARG_CONN_STATE_CLEANUP_WAIT) {
953 spin_unlock_bh(&conn->state_lock);
954 return;
955 }
956
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);
960
961 iscsit_handle_connection_cleanup(conn);
962}
963
964/*
965 * This is the simple function that makes the magic of
966 * sync and steering happen in the follow paradoxical order:
967 *
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
975 * offload buffer.
976 * 2) We are done!
977 * Next byte in the TCP stream will contain the next iSCSI PDU!
978 * Cool Huh?!
979 */
980int iscsit_recover_from_unknown_opcode(struct iscsi_conn *conn)
981{
982 /*
983 * Make sure the remaining bytes to next maker is a sane value.
984 */
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);
989 return -1;
990 }
991
992 pr_debug("Advancing %u bytes in TCP stream to get to the"
993 " next OFMarker.\n", conn->of_marker);
994
995 if (iscsit_dump_data_payload(conn, conn->of_marker, 0) < 0)
996 return -1;
997
998 /*
999 * Make sure the offset marker we retrived is a valid value.
1000 */
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);
1005 return -1;
1006 }
1007
1008 pr_debug("Discarding %u bytes of TCP stream to get to the"
1009 " next iSCSI Opcode.\n", conn->of_marker_offset);
1010
1011 if (iscsit_dump_data_payload(conn, conn->of_marker_offset, 0) < 0)
1012 return -1;
1013
1014 return 0;
1015}
Linux 6.x block layer and io_uring tree(s)