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Merge branch 'rc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / target / iscsi / iscsi_target_erl1.c
1 /*******************************************************************************
2 * This file contains error recovery level one used by the iSCSI Target driver.
3 *
4 * \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
5 *
6 * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
7 *
8 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 ******************************************************************************/
20
21 #include <linux/list.h>
22 #include <scsi/iscsi_proto.h>
23 #include <target/target_core_base.h>
24 #include <target/target_core_fabric.h>
25 #include <target/iscsi/iscsi_transport.h>
26
27 #include "iscsi_target_core.h"
28 #include "iscsi_target_seq_pdu_list.h"
29 #include "iscsi_target_datain_values.h"
30 #include "iscsi_target_device.h"
31 #include "iscsi_target_tpg.h"
32 #include "iscsi_target_util.h"
33 #include "iscsi_target_erl0.h"
34 #include "iscsi_target_erl1.h"
35 #include "iscsi_target_erl2.h"
36 #include "iscsi_target.h"
37
38 #define OFFLOAD_BUF_SIZE 32768
39
40 /*
41 * Used to dump excess datain payload for certain error recovery
42 * situations. Receive in OFFLOAD_BUF_SIZE max of datain per rx_data().
43 *
44 * dump_padding_digest denotes if padding and data digests need
45 * to be dumped.
46 */
47 int iscsit_dump_data_payload(
48 struct iscsi_conn *conn,
49 u32 buf_len,
50 int dump_padding_digest)
51 {
52 char *buf, pad_bytes[4];
53 int ret = DATAOUT_WITHIN_COMMAND_RECOVERY, rx_got;
54 u32 length, padding, offset = 0, size;
55 struct kvec iov;
56
57 if (conn->sess->sess_ops->RDMAExtensions)
58 return 0;
59
60 length = (buf_len > OFFLOAD_BUF_SIZE) ? OFFLOAD_BUF_SIZE : buf_len;
61
62 buf = kzalloc(length, GFP_ATOMIC);
63 if (!buf) {
64 pr_err("Unable to allocate %u bytes for offload"
65 " buffer.\n", length);
66 return -1;
67 }
68 memset(&iov, 0, sizeof(struct kvec));
69
70 while (offset < buf_len) {
71 size = ((offset + length) > buf_len) ?
72 (buf_len - offset) : length;
73
74 iov.iov_len = size;
75 iov.iov_base = buf;
76
77 rx_got = rx_data(conn, &iov, 1, size);
78 if (rx_got != size) {
79 ret = DATAOUT_CANNOT_RECOVER;
80 goto out;
81 }
82
83 offset += size;
84 }
85
86 if (!dump_padding_digest)
87 goto out;
88
89 padding = ((-buf_len) & 3);
90 if (padding != 0) {
91 iov.iov_len = padding;
92 iov.iov_base = pad_bytes;
93
94 rx_got = rx_data(conn, &iov, 1, padding);
95 if (rx_got != padding) {
96 ret = DATAOUT_CANNOT_RECOVER;
97 goto out;
98 }
99 }
100
101 if (conn->conn_ops->DataDigest) {
102 u32 data_crc;
103
104 iov.iov_len = ISCSI_CRC_LEN;
105 iov.iov_base = &data_crc;
106
107 rx_got = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
108 if (rx_got != ISCSI_CRC_LEN) {
109 ret = DATAOUT_CANNOT_RECOVER;
110 goto out;
111 }
112 }
113
114 out:
115 kfree(buf);
116 return ret;
117 }
118
119 /*
120 * Used for retransmitting R2Ts from a R2T SNACK request.
121 */
122 static int iscsit_send_recovery_r2t_for_snack(
123 struct iscsi_cmd *cmd,
124 struct iscsi_r2t *r2t)
125 {
126 /*
127 * If the struct iscsi_r2t has not been sent yet, we can safely
128 * ignore retransmission
129 * of the R2TSN in question.
130 */
131 spin_lock_bh(&cmd->r2t_lock);
132 if (!r2t->sent_r2t) {
133 spin_unlock_bh(&cmd->r2t_lock);
134 return 0;
135 }
136 r2t->sent_r2t = 0;
137 spin_unlock_bh(&cmd->r2t_lock);
138
139 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, ISTATE_SEND_R2T);
140
141 return 0;
142 }
143
144 static int iscsit_handle_r2t_snack(
145 struct iscsi_cmd *cmd,
146 unsigned char *buf,
147 u32 begrun,
148 u32 runlength)
149 {
150 u32 last_r2tsn;
151 struct iscsi_r2t *r2t;
152
153 /*
154 * Make sure the initiator is not requesting retransmission
155 * of R2TSNs already acknowledged by a TMR TASK_REASSIGN.
156 */
157 if ((cmd->cmd_flags & ICF_GOT_DATACK_SNACK) &&
158 (begrun <= cmd->acked_data_sn)) {
159 pr_err("ITT: 0x%08x, R2T SNACK requesting"
160 " retransmission of R2TSN: 0x%08x to 0x%08x but already"
161 " acked to R2TSN: 0x%08x by TMR TASK_REASSIGN,"
162 " protocol error.\n", cmd->init_task_tag, begrun,
163 (begrun + runlength), cmd->acked_data_sn);
164
165 return iscsit_add_reject_from_cmd(
166 ISCSI_REASON_PROTOCOL_ERROR,
167 1, 0, buf, cmd);
168 }
169
170 if (runlength) {
171 if ((begrun + runlength) > cmd->r2t_sn) {
172 pr_err("Command ITT: 0x%08x received R2T SNACK"
173 " with BegRun: 0x%08x, RunLength: 0x%08x, exceeds"
174 " current R2TSN: 0x%08x, protocol error.\n",
175 cmd->init_task_tag, begrun, runlength, cmd->r2t_sn);
176 return iscsit_add_reject_from_cmd(
177 ISCSI_REASON_BOOKMARK_INVALID, 1, 0, buf, cmd);
178 }
179 last_r2tsn = (begrun + runlength);
180 } else
181 last_r2tsn = cmd->r2t_sn;
182
183 while (begrun < last_r2tsn) {
184 r2t = iscsit_get_holder_for_r2tsn(cmd, begrun);
185 if (!r2t)
186 return -1;
187 if (iscsit_send_recovery_r2t_for_snack(cmd, r2t) < 0)
188 return -1;
189
190 begrun++;
191 }
192
193 return 0;
194 }
195
196 /*
197 * Generates Offsets and NextBurstLength based on Begrun and Runlength
198 * carried in a Data SNACK or ExpDataSN in TMR TASK_REASSIGN.
199 *
200 * For DataSequenceInOrder=Yes and DataPDUInOrder=[Yes,No] only.
201 *
202 * FIXME: How is this handled for a RData SNACK?
203 */
204 int iscsit_create_recovery_datain_values_datasequenceinorder_yes(
205 struct iscsi_cmd *cmd,
206 struct iscsi_datain_req *dr)
207 {
208 u32 data_sn = 0, data_sn_count = 0;
209 u32 pdu_start = 0, seq_no = 0;
210 u32 begrun = dr->begrun;
211 struct iscsi_conn *conn = cmd->conn;
212
213 while (begrun > data_sn++) {
214 data_sn_count++;
215 if ((dr->next_burst_len +
216 conn->conn_ops->MaxRecvDataSegmentLength) <
217 conn->sess->sess_ops->MaxBurstLength) {
218 dr->read_data_done +=
219 conn->conn_ops->MaxRecvDataSegmentLength;
220 dr->next_burst_len +=
221 conn->conn_ops->MaxRecvDataSegmentLength;
222 } else {
223 dr->read_data_done +=
224 (conn->sess->sess_ops->MaxBurstLength -
225 dr->next_burst_len);
226 dr->next_burst_len = 0;
227 pdu_start += data_sn_count;
228 data_sn_count = 0;
229 seq_no++;
230 }
231 }
232
233 if (!conn->sess->sess_ops->DataPDUInOrder) {
234 cmd->seq_no = seq_no;
235 cmd->pdu_start = pdu_start;
236 cmd->pdu_send_order = data_sn_count;
237 }
238
239 return 0;
240 }
241
242 /*
243 * Generates Offsets and NextBurstLength based on Begrun and Runlength
244 * carried in a Data SNACK or ExpDataSN in TMR TASK_REASSIGN.
245 *
246 * For DataSequenceInOrder=No and DataPDUInOrder=[Yes,No] only.
247 *
248 * FIXME: How is this handled for a RData SNACK?
249 */
250 int iscsit_create_recovery_datain_values_datasequenceinorder_no(
251 struct iscsi_cmd *cmd,
252 struct iscsi_datain_req *dr)
253 {
254 int found_seq = 0, i;
255 u32 data_sn, read_data_done = 0, seq_send_order = 0;
256 u32 begrun = dr->begrun;
257 u32 runlength = dr->runlength;
258 struct iscsi_conn *conn = cmd->conn;
259 struct iscsi_seq *first_seq = NULL, *seq = NULL;
260
261 if (!cmd->seq_list) {
262 pr_err("struct iscsi_cmd->seq_list is NULL!\n");
263 return -1;
264 }
265
266 /*
267 * Calculate read_data_done for all sequences containing a
268 * first_datasn and last_datasn less than the BegRun.
269 *
270 * Locate the struct iscsi_seq the BegRun lies within and calculate
271 * NextBurstLenghth up to the DataSN based on MaxRecvDataSegmentLength.
272 *
273 * Also use struct iscsi_seq->seq_send_order to determine where to start.
274 */
275 for (i = 0; i < cmd->seq_count; i++) {
276 seq = &cmd->seq_list[i];
277
278 if (!seq->seq_send_order)
279 first_seq = seq;
280
281 /*
282 * No data has been transferred for this DataIN sequence, so the
283 * seq->first_datasn and seq->last_datasn have not been set.
284 */
285 if (!seq->sent) {
286 pr_err("Ignoring non-sent sequence 0x%08x ->"
287 " 0x%08x\n\n", seq->first_datasn,
288 seq->last_datasn);
289 continue;
290 }
291
292 /*
293 * This DataIN sequence is precedes the received BegRun, add the
294 * total xfer_len of the sequence to read_data_done and reset
295 * seq->pdu_send_order.
296 */
297 if ((seq->first_datasn < begrun) &&
298 (seq->last_datasn < begrun)) {
299 pr_err("Pre BegRun sequence 0x%08x ->"
300 " 0x%08x\n", seq->first_datasn,
301 seq->last_datasn);
302
303 read_data_done += cmd->seq_list[i].xfer_len;
304 seq->next_burst_len = seq->pdu_send_order = 0;
305 continue;
306 }
307
308 /*
309 * The BegRun lies within this DataIN sequence.
310 */
311 if ((seq->first_datasn <= begrun) &&
312 (seq->last_datasn >= begrun)) {
313 pr_err("Found sequence begrun: 0x%08x in"
314 " 0x%08x -> 0x%08x\n", begrun,
315 seq->first_datasn, seq->last_datasn);
316
317 seq_send_order = seq->seq_send_order;
318 data_sn = seq->first_datasn;
319 seq->next_burst_len = seq->pdu_send_order = 0;
320 found_seq = 1;
321
322 /*
323 * For DataPDUInOrder=Yes, while the first DataSN of
324 * the sequence is less than the received BegRun, add
325 * the MaxRecvDataSegmentLength to read_data_done and
326 * to the sequence's next_burst_len;
327 *
328 * For DataPDUInOrder=No, while the first DataSN of the
329 * sequence is less than the received BegRun, find the
330 * struct iscsi_pdu of the DataSN in question and add the
331 * MaxRecvDataSegmentLength to read_data_done and to the
332 * sequence's next_burst_len;
333 */
334 if (conn->sess->sess_ops->DataPDUInOrder) {
335 while (data_sn < begrun) {
336 seq->pdu_send_order++;
337 read_data_done +=
338 conn->conn_ops->MaxRecvDataSegmentLength;
339 seq->next_burst_len +=
340 conn->conn_ops->MaxRecvDataSegmentLength;
341 data_sn++;
342 }
343 } else {
344 int j;
345 struct iscsi_pdu *pdu;
346
347 while (data_sn < begrun) {
348 seq->pdu_send_order++;
349
350 for (j = 0; j < seq->pdu_count; j++) {
351 pdu = &cmd->pdu_list[
352 seq->pdu_start + j];
353 if (pdu->data_sn == data_sn) {
354 read_data_done +=
355 pdu->length;
356 seq->next_burst_len +=
357 pdu->length;
358 }
359 }
360 data_sn++;
361 }
362 }
363 continue;
364 }
365
366 /*
367 * This DataIN sequence is larger than the received BegRun,
368 * reset seq->pdu_send_order and continue.
369 */
370 if ((seq->first_datasn > begrun) ||
371 (seq->last_datasn > begrun)) {
372 pr_err("Post BegRun sequence 0x%08x -> 0x%08x\n",
373 seq->first_datasn, seq->last_datasn);
374
375 seq->next_burst_len = seq->pdu_send_order = 0;
376 continue;
377 }
378 }
379
380 if (!found_seq) {
381 if (!begrun) {
382 if (!first_seq) {
383 pr_err("ITT: 0x%08x, Begrun: 0x%08x"
384 " but first_seq is NULL\n",
385 cmd->init_task_tag, begrun);
386 return -1;
387 }
388 seq_send_order = first_seq->seq_send_order;
389 seq->next_burst_len = seq->pdu_send_order = 0;
390 goto done;
391 }
392
393 pr_err("Unable to locate struct iscsi_seq for ITT: 0x%08x,"
394 " BegRun: 0x%08x, RunLength: 0x%08x while"
395 " DataSequenceInOrder=No and DataPDUInOrder=%s.\n",
396 cmd->init_task_tag, begrun, runlength,
397 (conn->sess->sess_ops->DataPDUInOrder) ? "Yes" : "No");
398 return -1;
399 }
400
401 done:
402 dr->read_data_done = read_data_done;
403 dr->seq_send_order = seq_send_order;
404
405 return 0;
406 }
407
408 static int iscsit_handle_recovery_datain(
409 struct iscsi_cmd *cmd,
410 unsigned char *buf,
411 u32 begrun,
412 u32 runlength)
413 {
414 struct iscsi_conn *conn = cmd->conn;
415 struct iscsi_datain_req *dr;
416 struct se_cmd *se_cmd = &cmd->se_cmd;
417
418 if (!(se_cmd->transport_state & CMD_T_COMPLETE)) {
419 pr_err("Ignoring ITT: 0x%08x Data SNACK\n",
420 cmd->init_task_tag);
421 return 0;
422 }
423
424 /*
425 * Make sure the initiator is not requesting retransmission
426 * of DataSNs already acknowledged by a Data ACK SNACK.
427 */
428 if ((cmd->cmd_flags & ICF_GOT_DATACK_SNACK) &&
429 (begrun <= cmd->acked_data_sn)) {
430 pr_err("ITT: 0x%08x, Data SNACK requesting"
431 " retransmission of DataSN: 0x%08x to 0x%08x but"
432 " already acked to DataSN: 0x%08x by Data ACK SNACK,"
433 " protocol error.\n", cmd->init_task_tag, begrun,
434 (begrun + runlength), cmd->acked_data_sn);
435
436 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
437 1, 0, buf, cmd);
438 }
439
440 /*
441 * Make sure BegRun and RunLength in the Data SNACK are sane.
442 * Note: (cmd->data_sn - 1) will carry the maximum DataSN sent.
443 */
444 if ((begrun + runlength) > (cmd->data_sn - 1)) {
445 pr_err("Initiator requesting BegRun: 0x%08x, RunLength"
446 ": 0x%08x greater than maximum DataSN: 0x%08x.\n",
447 begrun, runlength, (cmd->data_sn - 1));
448 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
449 1, 0, buf, cmd);
450 }
451
452 dr = iscsit_allocate_datain_req();
453 if (!dr)
454 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
455 1, 0, buf, cmd);
456
457 dr->data_sn = dr->begrun = begrun;
458 dr->runlength = runlength;
459 dr->generate_recovery_values = 1;
460 dr->recovery = DATAIN_WITHIN_COMMAND_RECOVERY;
461
462 iscsit_attach_datain_req(cmd, dr);
463
464 cmd->i_state = ISTATE_SEND_DATAIN;
465 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
466
467 return 0;
468 }
469
470 int iscsit_handle_recovery_datain_or_r2t(
471 struct iscsi_conn *conn,
472 unsigned char *buf,
473 itt_t init_task_tag,
474 u32 targ_xfer_tag,
475 u32 begrun,
476 u32 runlength)
477 {
478 struct iscsi_cmd *cmd;
479
480 cmd = iscsit_find_cmd_from_itt(conn, init_task_tag);
481 if (!cmd)
482 return 0;
483
484 /*
485 * FIXME: This will not work for bidi commands.
486 */
487 switch (cmd->data_direction) {
488 case DMA_TO_DEVICE:
489 return iscsit_handle_r2t_snack(cmd, buf, begrun, runlength);
490 case DMA_FROM_DEVICE:
491 return iscsit_handle_recovery_datain(cmd, buf, begrun,
492 runlength);
493 default:
494 pr_err("Unknown cmd->data_direction: 0x%02x\n",
495 cmd->data_direction);
496 return -1;
497 }
498
499 return 0;
500 }
501
502 /* #warning FIXME: Status SNACK needs to be dependent on OPCODE!!! */
503 int iscsit_handle_status_snack(
504 struct iscsi_conn *conn,
505 itt_t init_task_tag,
506 u32 targ_xfer_tag,
507 u32 begrun,
508 u32 runlength)
509 {
510 struct iscsi_cmd *cmd = NULL;
511 u32 last_statsn;
512 int found_cmd;
513
514 if (conn->exp_statsn > begrun) {
515 pr_err("Got Status SNACK Begrun: 0x%08x, RunLength:"
516 " 0x%08x but already got ExpStatSN: 0x%08x on CID:"
517 " %hu.\n", begrun, runlength, conn->exp_statsn,
518 conn->cid);
519 return 0;
520 }
521
522 last_statsn = (!runlength) ? conn->stat_sn : (begrun + runlength);
523
524 while (begrun < last_statsn) {
525 found_cmd = 0;
526
527 spin_lock_bh(&conn->cmd_lock);
528 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
529 if (cmd->stat_sn == begrun) {
530 found_cmd = 1;
531 break;
532 }
533 }
534 spin_unlock_bh(&conn->cmd_lock);
535
536 if (!found_cmd) {
537 pr_err("Unable to find StatSN: 0x%08x for"
538 " a Status SNACK, assuming this was a"
539 " protactic SNACK for an untransmitted"
540 " StatSN, ignoring.\n", begrun);
541 begrun++;
542 continue;
543 }
544
545 spin_lock_bh(&cmd->istate_lock);
546 if (cmd->i_state == ISTATE_SEND_DATAIN) {
547 spin_unlock_bh(&cmd->istate_lock);
548 pr_err("Ignoring Status SNACK for BegRun:"
549 " 0x%08x, RunLength: 0x%08x, assuming this was"
550 " a protactic SNACK for an untransmitted"
551 " StatSN\n", begrun, runlength);
552 begrun++;
553 continue;
554 }
555 spin_unlock_bh(&cmd->istate_lock);
556
557 cmd->i_state = ISTATE_SEND_STATUS_RECOVERY;
558 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
559 begrun++;
560 }
561
562 return 0;
563 }
564
565 int iscsit_handle_data_ack(
566 struct iscsi_conn *conn,
567 u32 targ_xfer_tag,
568 u32 begrun,
569 u32 runlength)
570 {
571 struct iscsi_cmd *cmd = NULL;
572
573 cmd = iscsit_find_cmd_from_ttt(conn, targ_xfer_tag);
574 if (!cmd) {
575 pr_err("Data ACK SNACK for TTT: 0x%08x is"
576 " invalid.\n", targ_xfer_tag);
577 return -1;
578 }
579
580 if (begrun <= cmd->acked_data_sn) {
581 pr_err("ITT: 0x%08x Data ACK SNACK BegRUN: 0x%08x is"
582 " less than the already acked DataSN: 0x%08x.\n",
583 cmd->init_task_tag, begrun, cmd->acked_data_sn);
584 return -1;
585 }
586
587 /*
588 * For Data ACK SNACK, BegRun is the next expected DataSN.
589 * (see iSCSI v19: 10.16.6)
590 */
591 cmd->cmd_flags |= ICF_GOT_DATACK_SNACK;
592 cmd->acked_data_sn = (begrun - 1);
593
594 pr_debug("Received Data ACK SNACK for ITT: 0x%08x,"
595 " updated acked DataSN to 0x%08x.\n",
596 cmd->init_task_tag, cmd->acked_data_sn);
597
598 return 0;
599 }
600
601 static int iscsit_send_recovery_r2t(
602 struct iscsi_cmd *cmd,
603 u32 offset,
604 u32 xfer_len)
605 {
606 int ret;
607
608 spin_lock_bh(&cmd->r2t_lock);
609 ret = iscsit_add_r2t_to_list(cmd, offset, xfer_len, 1, 0);
610 spin_unlock_bh(&cmd->r2t_lock);
611
612 return ret;
613 }
614
615 int iscsit_dataout_datapduinorder_no_fbit(
616 struct iscsi_cmd *cmd,
617 struct iscsi_pdu *pdu)
618 {
619 int i, send_recovery_r2t = 0, recovery = 0;
620 u32 length = 0, offset = 0, pdu_count = 0, xfer_len = 0;
621 struct iscsi_conn *conn = cmd->conn;
622 struct iscsi_pdu *first_pdu = NULL;
623
624 /*
625 * Get an struct iscsi_pdu pointer to the first PDU, and total PDU count
626 * of the DataOUT sequence.
627 */
628 if (conn->sess->sess_ops->DataSequenceInOrder) {
629 for (i = 0; i < cmd->pdu_count; i++) {
630 if (cmd->pdu_list[i].seq_no == pdu->seq_no) {
631 if (!first_pdu)
632 first_pdu = &cmd->pdu_list[i];
633 xfer_len += cmd->pdu_list[i].length;
634 pdu_count++;
635 } else if (pdu_count)
636 break;
637 }
638 } else {
639 struct iscsi_seq *seq = cmd->seq_ptr;
640
641 first_pdu = &cmd->pdu_list[seq->pdu_start];
642 pdu_count = seq->pdu_count;
643 }
644
645 if (!first_pdu || !pdu_count)
646 return DATAOUT_CANNOT_RECOVER;
647
648 /*
649 * Loop through the ending DataOUT Sequence checking each struct iscsi_pdu.
650 * The following ugly logic does batching of not received PDUs.
651 */
652 for (i = 0; i < pdu_count; i++) {
653 if (first_pdu[i].status == ISCSI_PDU_RECEIVED_OK) {
654 if (!send_recovery_r2t)
655 continue;
656
657 if (iscsit_send_recovery_r2t(cmd, offset, length) < 0)
658 return DATAOUT_CANNOT_RECOVER;
659
660 send_recovery_r2t = length = offset = 0;
661 continue;
662 }
663 /*
664 * Set recovery = 1 for any missing, CRC failed, or timed
665 * out PDUs to let the DataOUT logic know that this sequence
666 * has not been completed yet.
667 *
668 * Also, only send a Recovery R2T for ISCSI_PDU_NOT_RECEIVED.
669 * We assume if the PDU either failed CRC or timed out
670 * that a Recovery R2T has already been sent.
671 */
672 recovery = 1;
673
674 if (first_pdu[i].status != ISCSI_PDU_NOT_RECEIVED)
675 continue;
676
677 if (!offset)
678 offset = first_pdu[i].offset;
679 length += first_pdu[i].length;
680
681 send_recovery_r2t = 1;
682 }
683
684 if (send_recovery_r2t)
685 if (iscsit_send_recovery_r2t(cmd, offset, length) < 0)
686 return DATAOUT_CANNOT_RECOVER;
687
688 return (!recovery) ? DATAOUT_NORMAL : DATAOUT_WITHIN_COMMAND_RECOVERY;
689 }
690
691 static int iscsit_recalculate_dataout_values(
692 struct iscsi_cmd *cmd,
693 u32 pdu_offset,
694 u32 pdu_length,
695 u32 *r2t_offset,
696 u32 *r2t_length)
697 {
698 int i;
699 struct iscsi_conn *conn = cmd->conn;
700 struct iscsi_pdu *pdu = NULL;
701
702 if (conn->sess->sess_ops->DataSequenceInOrder) {
703 cmd->data_sn = 0;
704
705 if (conn->sess->sess_ops->DataPDUInOrder) {
706 *r2t_offset = cmd->write_data_done;
707 *r2t_length = (cmd->seq_end_offset -
708 cmd->write_data_done);
709 return 0;
710 }
711
712 *r2t_offset = cmd->seq_start_offset;
713 *r2t_length = (cmd->seq_end_offset - cmd->seq_start_offset);
714
715 for (i = 0; i < cmd->pdu_count; i++) {
716 pdu = &cmd->pdu_list[i];
717
718 if (pdu->status != ISCSI_PDU_RECEIVED_OK)
719 continue;
720
721 if ((pdu->offset >= cmd->seq_start_offset) &&
722 ((pdu->offset + pdu->length) <=
723 cmd->seq_end_offset)) {
724 if (!cmd->unsolicited_data)
725 cmd->next_burst_len -= pdu->length;
726 else
727 cmd->first_burst_len -= pdu->length;
728
729 cmd->write_data_done -= pdu->length;
730 pdu->status = ISCSI_PDU_NOT_RECEIVED;
731 }
732 }
733 } else {
734 struct iscsi_seq *seq = NULL;
735
736 seq = iscsit_get_seq_holder(cmd, pdu_offset, pdu_length);
737 if (!seq)
738 return -1;
739
740 *r2t_offset = seq->orig_offset;
741 *r2t_length = seq->xfer_len;
742
743 cmd->write_data_done -= (seq->offset - seq->orig_offset);
744 if (cmd->immediate_data)
745 cmd->first_burst_len = cmd->write_data_done;
746
747 seq->data_sn = 0;
748 seq->offset = seq->orig_offset;
749 seq->next_burst_len = 0;
750 seq->status = DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY;
751
752 if (conn->sess->sess_ops->DataPDUInOrder)
753 return 0;
754
755 for (i = 0; i < seq->pdu_count; i++) {
756 pdu = &cmd->pdu_list[i+seq->pdu_start];
757
758 if (pdu->status != ISCSI_PDU_RECEIVED_OK)
759 continue;
760
761 pdu->status = ISCSI_PDU_NOT_RECEIVED;
762 }
763 }
764
765 return 0;
766 }
767
768 int iscsit_recover_dataout_sequence(
769 struct iscsi_cmd *cmd,
770 u32 pdu_offset,
771 u32 pdu_length)
772 {
773 u32 r2t_length = 0, r2t_offset = 0;
774
775 spin_lock_bh(&cmd->istate_lock);
776 cmd->cmd_flags |= ICF_WITHIN_COMMAND_RECOVERY;
777 spin_unlock_bh(&cmd->istate_lock);
778
779 if (iscsit_recalculate_dataout_values(cmd, pdu_offset, pdu_length,
780 &r2t_offset, &r2t_length) < 0)
781 return DATAOUT_CANNOT_RECOVER;
782
783 iscsit_send_recovery_r2t(cmd, r2t_offset, r2t_length);
784
785 return DATAOUT_WITHIN_COMMAND_RECOVERY;
786 }
787
788 static struct iscsi_ooo_cmdsn *iscsit_allocate_ooo_cmdsn(void)
789 {
790 struct iscsi_ooo_cmdsn *ooo_cmdsn = NULL;
791
792 ooo_cmdsn = kmem_cache_zalloc(lio_ooo_cache, GFP_ATOMIC);
793 if (!ooo_cmdsn) {
794 pr_err("Unable to allocate memory for"
795 " struct iscsi_ooo_cmdsn.\n");
796 return NULL;
797 }
798 INIT_LIST_HEAD(&ooo_cmdsn->ooo_list);
799
800 return ooo_cmdsn;
801 }
802
803 /*
804 * Called with sess->cmdsn_mutex held.
805 */
806 static int iscsit_attach_ooo_cmdsn(
807 struct iscsi_session *sess,
808 struct iscsi_ooo_cmdsn *ooo_cmdsn)
809 {
810 struct iscsi_ooo_cmdsn *ooo_tail, *ooo_tmp;
811 /*
812 * We attach the struct iscsi_ooo_cmdsn entry to the out of order
813 * list in increasing CmdSN order.
814 * This allows iscsi_execute_ooo_cmdsns() to detect any
815 * additional CmdSN holes while performing delayed execution.
816 */
817 if (list_empty(&sess->sess_ooo_cmdsn_list))
818 list_add_tail(&ooo_cmdsn->ooo_list,
819 &sess->sess_ooo_cmdsn_list);
820 else {
821 ooo_tail = list_entry(sess->sess_ooo_cmdsn_list.prev,
822 typeof(*ooo_tail), ooo_list);
823 /*
824 * CmdSN is greater than the tail of the list.
825 */
826 if (iscsi_sna_lt(ooo_tail->cmdsn, ooo_cmdsn->cmdsn))
827 list_add_tail(&ooo_cmdsn->ooo_list,
828 &sess->sess_ooo_cmdsn_list);
829 else {
830 /*
831 * CmdSN is either lower than the head, or somewhere
832 * in the middle.
833 */
834 list_for_each_entry(ooo_tmp, &sess->sess_ooo_cmdsn_list,
835 ooo_list) {
836 if (iscsi_sna_lt(ooo_tmp->cmdsn, ooo_cmdsn->cmdsn))
837 continue;
838
839 /* Insert before this entry */
840 list_add(&ooo_cmdsn->ooo_list,
841 ooo_tmp->ooo_list.prev);
842 break;
843 }
844 }
845 }
846
847 return 0;
848 }
849
850 /*
851 * Removes an struct iscsi_ooo_cmdsn from a session's list,
852 * called with struct iscsi_session->cmdsn_mutex held.
853 */
854 void iscsit_remove_ooo_cmdsn(
855 struct iscsi_session *sess,
856 struct iscsi_ooo_cmdsn *ooo_cmdsn)
857 {
858 list_del(&ooo_cmdsn->ooo_list);
859 kmem_cache_free(lio_ooo_cache, ooo_cmdsn);
860 }
861
862 void iscsit_clear_ooo_cmdsns_for_conn(struct iscsi_conn *conn)
863 {
864 struct iscsi_ooo_cmdsn *ooo_cmdsn;
865 struct iscsi_session *sess = conn->sess;
866
867 mutex_lock(&sess->cmdsn_mutex);
868 list_for_each_entry(ooo_cmdsn, &sess->sess_ooo_cmdsn_list, ooo_list) {
869 if (ooo_cmdsn->cid != conn->cid)
870 continue;
871
872 ooo_cmdsn->cmd = NULL;
873 }
874 mutex_unlock(&sess->cmdsn_mutex);
875 }
876
877 /*
878 * Called with sess->cmdsn_mutex held.
879 */
880 int iscsit_execute_ooo_cmdsns(struct iscsi_session *sess)
881 {
882 int ooo_count = 0;
883 struct iscsi_cmd *cmd = NULL;
884 struct iscsi_ooo_cmdsn *ooo_cmdsn, *ooo_cmdsn_tmp;
885
886 list_for_each_entry_safe(ooo_cmdsn, ooo_cmdsn_tmp,
887 &sess->sess_ooo_cmdsn_list, ooo_list) {
888 if (ooo_cmdsn->cmdsn != sess->exp_cmd_sn)
889 continue;
890
891 if (!ooo_cmdsn->cmd) {
892 sess->exp_cmd_sn++;
893 iscsit_remove_ooo_cmdsn(sess, ooo_cmdsn);
894 continue;
895 }
896
897 cmd = ooo_cmdsn->cmd;
898 cmd->i_state = cmd->deferred_i_state;
899 ooo_count++;
900 sess->exp_cmd_sn++;
901 pr_debug("Executing out of order CmdSN: 0x%08x,"
902 " incremented ExpCmdSN to 0x%08x.\n",
903 cmd->cmd_sn, sess->exp_cmd_sn);
904
905 iscsit_remove_ooo_cmdsn(sess, ooo_cmdsn);
906
907 if (iscsit_execute_cmd(cmd, 1) < 0)
908 return -1;
909
910 continue;
911 }
912
913 return ooo_count;
914 }
915
916 /*
917 * Called either:
918 *
919 * 1. With sess->cmdsn_mutex held from iscsi_execute_ooo_cmdsns()
920 * or iscsi_check_received_cmdsn().
921 * 2. With no locks held directly from iscsi_handle_XXX_pdu() functions
922 * for immediate commands.
923 */
924 int iscsit_execute_cmd(struct iscsi_cmd *cmd, int ooo)
925 {
926 struct se_cmd *se_cmd = &cmd->se_cmd;
927 struct iscsi_conn *conn = cmd->conn;
928 int lr = 0;
929
930 spin_lock_bh(&cmd->istate_lock);
931 if (ooo)
932 cmd->cmd_flags &= ~ICF_OOO_CMDSN;
933
934 switch (cmd->iscsi_opcode) {
935 case ISCSI_OP_SCSI_CMD:
936 /*
937 * Go ahead and send the CHECK_CONDITION status for
938 * any SCSI CDB exceptions that may have occurred.
939 */
940 if (cmd->sense_reason) {
941 if (cmd->sense_reason == TCM_RESERVATION_CONFLICT) {
942 cmd->i_state = ISTATE_SEND_STATUS;
943 spin_unlock_bh(&cmd->istate_lock);
944 iscsit_add_cmd_to_response_queue(cmd, cmd->conn,
945 cmd->i_state);
946 return 0;
947 }
948 spin_unlock_bh(&cmd->istate_lock);
949 /*
950 * Determine if delayed TASK_ABORTED status for WRITEs
951 * should be sent now if no unsolicited data out
952 * payloads are expected, or if the delayed status
953 * should be sent after unsolicited data out with
954 * ISCSI_FLAG_CMD_FINAL set in iscsi_handle_data_out()
955 */
956 if (transport_check_aborted_status(se_cmd,
957 (cmd->unsolicited_data == 0)) != 0)
958 return 0;
959 /*
960 * Otherwise send CHECK_CONDITION and sense for
961 * exception
962 */
963 return transport_send_check_condition_and_sense(se_cmd,
964 cmd->sense_reason, 0);
965 }
966 /*
967 * Special case for delayed CmdSN with Immediate
968 * Data and/or Unsolicited Data Out attached.
969 */
970 if (cmd->immediate_data) {
971 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
972 spin_unlock_bh(&cmd->istate_lock);
973 target_execute_cmd(&cmd->se_cmd);
974 return 0;
975 }
976 spin_unlock_bh(&cmd->istate_lock);
977
978 if (!(cmd->cmd_flags &
979 ICF_NON_IMMEDIATE_UNSOLICITED_DATA)) {
980 /*
981 * Send the delayed TASK_ABORTED status for
982 * WRITEs if no more unsolicitied data is
983 * expected.
984 */
985 if (transport_check_aborted_status(se_cmd, 1)
986 != 0)
987 return 0;
988
989 iscsit_set_dataout_sequence_values(cmd);
990 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
991 }
992 return 0;
993 }
994 /*
995 * The default handler.
996 */
997 spin_unlock_bh(&cmd->istate_lock);
998
999 if ((cmd->data_direction == DMA_TO_DEVICE) &&
1000 !(cmd->cmd_flags & ICF_NON_IMMEDIATE_UNSOLICITED_DATA)) {
1001 /*
1002 * Send the delayed TASK_ABORTED status for WRITEs if
1003 * no more nsolicitied data is expected.
1004 */
1005 if (transport_check_aborted_status(se_cmd, 1) != 0)
1006 return 0;
1007
1008 iscsit_set_unsoliticed_dataout(cmd);
1009 }
1010 return transport_handle_cdb_direct(&cmd->se_cmd);
1011
1012 case ISCSI_OP_NOOP_OUT:
1013 case ISCSI_OP_TEXT:
1014 spin_unlock_bh(&cmd->istate_lock);
1015 iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
1016 break;
1017 case ISCSI_OP_SCSI_TMFUNC:
1018 if (cmd->se_cmd.se_tmr_req->response) {
1019 spin_unlock_bh(&cmd->istate_lock);
1020 iscsit_add_cmd_to_response_queue(cmd, cmd->conn,
1021 cmd->i_state);
1022 return 0;
1023 }
1024 spin_unlock_bh(&cmd->istate_lock);
1025
1026 return transport_generic_handle_tmr(&cmd->se_cmd);
1027 case ISCSI_OP_LOGOUT:
1028 spin_unlock_bh(&cmd->istate_lock);
1029 switch (cmd->logout_reason) {
1030 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
1031 lr = iscsit_logout_closesession(cmd, cmd->conn);
1032 break;
1033 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
1034 lr = iscsit_logout_closeconnection(cmd, cmd->conn);
1035 break;
1036 case ISCSI_LOGOUT_REASON_RECOVERY:
1037 lr = iscsit_logout_removeconnforrecovery(cmd, cmd->conn);
1038 break;
1039 default:
1040 pr_err("Unknown iSCSI Logout Request Code:"
1041 " 0x%02x\n", cmd->logout_reason);
1042 return -1;
1043 }
1044
1045 return lr;
1046 default:
1047 spin_unlock_bh(&cmd->istate_lock);
1048 pr_err("Cannot perform out of order execution for"
1049 " unknown iSCSI Opcode: 0x%02x\n", cmd->iscsi_opcode);
1050 return -1;
1051 }
1052
1053 return 0;
1054 }
1055
1056 void iscsit_free_all_ooo_cmdsns(struct iscsi_session *sess)
1057 {
1058 struct iscsi_ooo_cmdsn *ooo_cmdsn, *ooo_cmdsn_tmp;
1059
1060 mutex_lock(&sess->cmdsn_mutex);
1061 list_for_each_entry_safe(ooo_cmdsn, ooo_cmdsn_tmp,
1062 &sess->sess_ooo_cmdsn_list, ooo_list) {
1063
1064 list_del(&ooo_cmdsn->ooo_list);
1065 kmem_cache_free(lio_ooo_cache, ooo_cmdsn);
1066 }
1067 mutex_unlock(&sess->cmdsn_mutex);
1068 }
1069
1070 int iscsit_handle_ooo_cmdsn(
1071 struct iscsi_session *sess,
1072 struct iscsi_cmd *cmd,
1073 u32 cmdsn)
1074 {
1075 int batch = 0;
1076 struct iscsi_ooo_cmdsn *ooo_cmdsn = NULL, *ooo_tail = NULL;
1077
1078 cmd->deferred_i_state = cmd->i_state;
1079 cmd->i_state = ISTATE_DEFERRED_CMD;
1080 cmd->cmd_flags |= ICF_OOO_CMDSN;
1081
1082 if (list_empty(&sess->sess_ooo_cmdsn_list))
1083 batch = 1;
1084 else {
1085 ooo_tail = list_entry(sess->sess_ooo_cmdsn_list.prev,
1086 typeof(*ooo_tail), ooo_list);
1087 if (ooo_tail->cmdsn != (cmdsn - 1))
1088 batch = 1;
1089 }
1090
1091 ooo_cmdsn = iscsit_allocate_ooo_cmdsn();
1092 if (!ooo_cmdsn)
1093 return CMDSN_ERROR_CANNOT_RECOVER;
1094
1095 ooo_cmdsn->cmd = cmd;
1096 ooo_cmdsn->batch_count = (batch) ?
1097 (cmdsn - sess->exp_cmd_sn) : 1;
1098 ooo_cmdsn->cid = cmd->conn->cid;
1099 ooo_cmdsn->exp_cmdsn = sess->exp_cmd_sn;
1100 ooo_cmdsn->cmdsn = cmdsn;
1101
1102 if (iscsit_attach_ooo_cmdsn(sess, ooo_cmdsn) < 0) {
1103 kmem_cache_free(lio_ooo_cache, ooo_cmdsn);
1104 return CMDSN_ERROR_CANNOT_RECOVER;
1105 }
1106
1107 return CMDSN_HIGHER_THAN_EXP;
1108 }
1109
1110 static int iscsit_set_dataout_timeout_values(
1111 struct iscsi_cmd *cmd,
1112 u32 *offset,
1113 u32 *length)
1114 {
1115 struct iscsi_conn *conn = cmd->conn;
1116 struct iscsi_r2t *r2t;
1117
1118 if (cmd->unsolicited_data) {
1119 *offset = 0;
1120 *length = (conn->sess->sess_ops->FirstBurstLength >
1121 cmd->se_cmd.data_length) ?
1122 cmd->se_cmd.data_length :
1123 conn->sess->sess_ops->FirstBurstLength;
1124 return 0;
1125 }
1126
1127 spin_lock_bh(&cmd->r2t_lock);
1128 if (list_empty(&cmd->cmd_r2t_list)) {
1129 pr_err("cmd->cmd_r2t_list is empty!\n");
1130 spin_unlock_bh(&cmd->r2t_lock);
1131 return -1;
1132 }
1133
1134 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
1135 if (r2t->sent_r2t && !r2t->recovery_r2t && !r2t->seq_complete) {
1136 *offset = r2t->offset;
1137 *length = r2t->xfer_len;
1138 spin_unlock_bh(&cmd->r2t_lock);
1139 return 0;
1140 }
1141 }
1142 spin_unlock_bh(&cmd->r2t_lock);
1143
1144 pr_err("Unable to locate any incomplete DataOUT"
1145 " sequences for ITT: 0x%08x.\n", cmd->init_task_tag);
1146
1147 return -1;
1148 }
1149
1150 /*
1151 * NOTE: Called from interrupt (timer) context.
1152 */
1153 static void iscsit_handle_dataout_timeout(unsigned long data)
1154 {
1155 u32 pdu_length = 0, pdu_offset = 0;
1156 u32 r2t_length = 0, r2t_offset = 0;
1157 struct iscsi_cmd *cmd = (struct iscsi_cmd *) data;
1158 struct iscsi_conn *conn = cmd->conn;
1159 struct iscsi_session *sess = NULL;
1160 struct iscsi_node_attrib *na;
1161
1162 iscsit_inc_conn_usage_count(conn);
1163
1164 spin_lock_bh(&cmd->dataout_timeout_lock);
1165 if (cmd->dataout_timer_flags & ISCSI_TF_STOP) {
1166 spin_unlock_bh(&cmd->dataout_timeout_lock);
1167 iscsit_dec_conn_usage_count(conn);
1168 return;
1169 }
1170 cmd->dataout_timer_flags &= ~ISCSI_TF_RUNNING;
1171 sess = conn->sess;
1172 na = iscsit_tpg_get_node_attrib(sess);
1173
1174 if (!sess->sess_ops->ErrorRecoveryLevel) {
1175 pr_debug("Unable to recover from DataOut timeout while"
1176 " in ERL=0.\n");
1177 goto failure;
1178 }
1179
1180 if (++cmd->dataout_timeout_retries == na->dataout_timeout_retries) {
1181 pr_debug("Command ITT: 0x%08x exceeded max retries"
1182 " for DataOUT timeout %u, closing iSCSI connection.\n",
1183 cmd->init_task_tag, na->dataout_timeout_retries);
1184 goto failure;
1185 }
1186
1187 cmd->cmd_flags |= ICF_WITHIN_COMMAND_RECOVERY;
1188
1189 if (conn->sess->sess_ops->DataSequenceInOrder) {
1190 if (conn->sess->sess_ops->DataPDUInOrder) {
1191 pdu_offset = cmd->write_data_done;
1192 if ((pdu_offset + (conn->sess->sess_ops->MaxBurstLength -
1193 cmd->next_burst_len)) > cmd->se_cmd.data_length)
1194 pdu_length = (cmd->se_cmd.data_length -
1195 cmd->write_data_done);
1196 else
1197 pdu_length = (conn->sess->sess_ops->MaxBurstLength -
1198 cmd->next_burst_len);
1199 } else {
1200 pdu_offset = cmd->seq_start_offset;
1201 pdu_length = (cmd->seq_end_offset -
1202 cmd->seq_start_offset);
1203 }
1204 } else {
1205 if (iscsit_set_dataout_timeout_values(cmd, &pdu_offset,
1206 &pdu_length) < 0)
1207 goto failure;
1208 }
1209
1210 if (iscsit_recalculate_dataout_values(cmd, pdu_offset, pdu_length,
1211 &r2t_offset, &r2t_length) < 0)
1212 goto failure;
1213
1214 pr_debug("Command ITT: 0x%08x timed out waiting for"
1215 " completion of %sDataOUT Sequence Offset: %u, Length: %u\n",
1216 cmd->init_task_tag, (cmd->unsolicited_data) ? "Unsolicited " :
1217 "", r2t_offset, r2t_length);
1218
1219 if (iscsit_send_recovery_r2t(cmd, r2t_offset, r2t_length) < 0)
1220 goto failure;
1221
1222 iscsit_start_dataout_timer(cmd, conn);
1223 spin_unlock_bh(&cmd->dataout_timeout_lock);
1224 iscsit_dec_conn_usage_count(conn);
1225
1226 return;
1227
1228 failure:
1229 spin_unlock_bh(&cmd->dataout_timeout_lock);
1230 iscsit_cause_connection_reinstatement(conn, 0);
1231 iscsit_dec_conn_usage_count(conn);
1232 }
1233
1234 void iscsit_mod_dataout_timer(struct iscsi_cmd *cmd)
1235 {
1236 struct iscsi_conn *conn = cmd->conn;
1237 struct iscsi_session *sess = conn->sess;
1238 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1239
1240 spin_lock_bh(&cmd->dataout_timeout_lock);
1241 if (!(cmd->dataout_timer_flags & ISCSI_TF_RUNNING)) {
1242 spin_unlock_bh(&cmd->dataout_timeout_lock);
1243 return;
1244 }
1245
1246 mod_timer(&cmd->dataout_timer,
1247 (get_jiffies_64() + na->dataout_timeout * HZ));
1248 pr_debug("Updated DataOUT timer for ITT: 0x%08x",
1249 cmd->init_task_tag);
1250 spin_unlock_bh(&cmd->dataout_timeout_lock);
1251 }
1252
1253 /*
1254 * Called with cmd->dataout_timeout_lock held.
1255 */
1256 void iscsit_start_dataout_timer(
1257 struct iscsi_cmd *cmd,
1258 struct iscsi_conn *conn)
1259 {
1260 struct iscsi_session *sess = conn->sess;
1261 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1262
1263 if (cmd->dataout_timer_flags & ISCSI_TF_RUNNING)
1264 return;
1265
1266 pr_debug("Starting DataOUT timer for ITT: 0x%08x on"
1267 " CID: %hu.\n", cmd->init_task_tag, conn->cid);
1268
1269 init_timer(&cmd->dataout_timer);
1270 cmd->dataout_timer.expires = (get_jiffies_64() + na->dataout_timeout * HZ);
1271 cmd->dataout_timer.data = (unsigned long)cmd;
1272 cmd->dataout_timer.function = iscsit_handle_dataout_timeout;
1273 cmd->dataout_timer_flags &= ~ISCSI_TF_STOP;
1274 cmd->dataout_timer_flags |= ISCSI_TF_RUNNING;
1275 add_timer(&cmd->dataout_timer);
1276 }
1277
1278 void iscsit_stop_dataout_timer(struct iscsi_cmd *cmd)
1279 {
1280 spin_lock_bh(&cmd->dataout_timeout_lock);
1281 if (!(cmd->dataout_timer_flags & ISCSI_TF_RUNNING)) {
1282 spin_unlock_bh(&cmd->dataout_timeout_lock);
1283 return;
1284 }
1285 cmd->dataout_timer_flags |= ISCSI_TF_STOP;
1286 spin_unlock_bh(&cmd->dataout_timeout_lock);
1287
1288 del_timer_sync(&cmd->dataout_timer);
1289
1290 spin_lock_bh(&cmd->dataout_timeout_lock);
1291 cmd->dataout_timer_flags &= ~ISCSI_TF_RUNNING;
1292 pr_debug("Stopped DataOUT Timer for ITT: 0x%08x\n",
1293 cmd->init_task_tag);
1294 spin_unlock_bh(&cmd->dataout_timeout_lock);
1295 }
1296 EXPORT_SYMBOL(iscsit_stop_dataout_timer);
kernel source for telekom puls (alcatel/mediatek)