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initial commit with v3.6.7
[linux-3.6.7-moxart.git] / drivers / target / iscsi / iscsi_target_erl1.c
blob3df8a2cef86faab090bcf24dfbc377cc00b32e04
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
26 #include "iscsi_target_core.h"
27 #include "iscsi_target_seq_pdu_list.h"
28 #include "iscsi_target_datain_values.h"
29 #include "iscsi_target_device.h"
30 #include "iscsi_target_tpg.h"
31 #include "iscsi_target_util.h"
32 #include "iscsi_target_erl0.h"
33 #include "iscsi_target_erl1.h"
34 #include "iscsi_target_erl2.h"
35 #include "iscsi_target.h"
36
37 #define OFFLOAD_BUF_SIZE 32768
38
39 /*
40 * Used to dump excess datain payload for certain error recovery
41 * situations. Receive in OFFLOAD_BUF_SIZE max of datain per rx_data().
42 *
43 * dump_padding_digest denotes if padding and data digests need
44 * to be dumped.
45 */
46 int iscsit_dump_data_payload(
47 struct iscsi_conn *conn,
48 u32 buf_len,
49 int dump_padding_digest)
50 {
51 char *buf, pad_bytes[4];
52 int ret = DATAOUT_WITHIN_COMMAND_RECOVERY, rx_got;
53 u32 length, padding, offset = 0, size;
54 struct kvec iov;
55
56 length = (buf_len > OFFLOAD_BUF_SIZE) ? OFFLOAD_BUF_SIZE : buf_len;
57
58 buf = kzalloc(length, GFP_ATOMIC);
59 if (!buf) {
60 pr_err("Unable to allocate %u bytes for offload"
61 " buffer.\n", length);
62 return -1;
63 }
64 memset(&iov, 0, sizeof(struct kvec));
65
66 while (offset < buf_len) {
67 size = ((offset + length) > buf_len) ?
68 (buf_len - offset) : length;
69
70 iov.iov_len = size;
71 iov.iov_base = buf;
72
73 rx_got = rx_data(conn, &iov, 1, size);
74 if (rx_got != size) {
75 ret = DATAOUT_CANNOT_RECOVER;
76 goto out;
77 }
78
79 offset += size;
80 }
81
82 if (!dump_padding_digest)
83 goto out;
84
85 padding = ((-buf_len) & 3);
86 if (padding != 0) {
87 iov.iov_len = padding;
88 iov.iov_base = pad_bytes;
89
90 rx_got = rx_data(conn, &iov, 1, padding);
91 if (rx_got != padding) {
92 ret = DATAOUT_CANNOT_RECOVER;
93 goto out;
94 }
95 }
96
97 if (conn->conn_ops->DataDigest) {
98 u32 data_crc;
99
100 iov.iov_len = ISCSI_CRC_LEN;
101 iov.iov_base = &data_crc;
102
103 rx_got = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
104 if (rx_got != ISCSI_CRC_LEN) {
105 ret = DATAOUT_CANNOT_RECOVER;
106 goto out;
107 }
108 }
109
110 out:
111 kfree(buf);
112 return ret;
113 }
114
115 /*
116 * Used for retransmitting R2Ts from a R2T SNACK request.
117 */
118 static int iscsit_send_recovery_r2t_for_snack(
119 struct iscsi_cmd *cmd,
120 struct iscsi_r2t *r2t)
121 {
122 /*
123 * If the struct iscsi_r2t has not been sent yet, we can safely
124 * ignore retransmission
125 * of the R2TSN in question.
126 */
127 spin_lock_bh(&cmd->r2t_lock);
128 if (!r2t->sent_r2t) {
129 spin_unlock_bh(&cmd->r2t_lock);
130 return 0;
131 }
132 r2t->sent_r2t = 0;
133 spin_unlock_bh(&cmd->r2t_lock);
134
135 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, ISTATE_SEND_R2T);
136
137 return 0;
138 }
139
140 static int iscsit_handle_r2t_snack(
141 struct iscsi_cmd *cmd,
142 unsigned char *buf,
143 u32 begrun,
144 u32 runlength)
145 {
146 u32 last_r2tsn;
147 struct iscsi_r2t *r2t;
148
149 /*
150 * Make sure the initiator is not requesting retransmission
151 * of R2TSNs already acknowledged by a TMR TASK_REASSIGN.
152 */
153 if ((cmd->cmd_flags & ICF_GOT_DATACK_SNACK) &&
154 (begrun <= cmd->acked_data_sn)) {
155 pr_err("ITT: 0x%08x, R2T SNACK requesting"
156 " retransmission of R2TSN: 0x%08x to 0x%08x but already"
157 " acked to R2TSN: 0x%08x by TMR TASK_REASSIGN,"
158 " protocol error.\n", cmd->init_task_tag, begrun,
159 (begrun + runlength), cmd->acked_data_sn);
160
161 return iscsit_add_reject_from_cmd(
162 ISCSI_REASON_PROTOCOL_ERROR,
163 1, 0, buf, cmd);
164 }
165
166 if (runlength) {
167 if ((begrun + runlength) > cmd->r2t_sn) {
168 pr_err("Command ITT: 0x%08x received R2T SNACK"
169 " with BegRun: 0x%08x, RunLength: 0x%08x, exceeds"
170 " current R2TSN: 0x%08x, protocol error.\n",
171 cmd->init_task_tag, begrun, runlength, cmd->r2t_sn);
172 return iscsit_add_reject_from_cmd(
173 ISCSI_REASON_BOOKMARK_INVALID, 1, 0, buf, cmd);
174 }
175 last_r2tsn = (begrun + runlength);
176 } else
177 last_r2tsn = cmd->r2t_sn;
178
179 while (begrun < last_r2tsn) {
180 r2t = iscsit_get_holder_for_r2tsn(cmd, begrun);
181 if (!r2t)
182 return -1;
183 if (iscsit_send_recovery_r2t_for_snack(cmd, r2t) < 0)
184 return -1;
185
186 begrun++;
187 }
188
189 return 0;
190 }
191
192 /*
193 * Generates Offsets and NextBurstLength based on Begrun and Runlength
194 * carried in a Data SNACK or ExpDataSN in TMR TASK_REASSIGN.
195 *
196 * For DataSequenceInOrder=Yes and DataPDUInOrder=[Yes,No] only.
197 *
198 * FIXME: How is this handled for a RData SNACK?
199 */
200 int iscsit_create_recovery_datain_values_datasequenceinorder_yes(
201 struct iscsi_cmd *cmd,
202 struct iscsi_datain_req *dr)
203 {
204 u32 data_sn = 0, data_sn_count = 0;
205 u32 pdu_start = 0, seq_no = 0;
206 u32 begrun = dr->begrun;
207 struct iscsi_conn *conn = cmd->conn;
208
209 while (begrun > data_sn++) {
210 data_sn_count++;
211 if ((dr->next_burst_len +
212 conn->conn_ops->MaxRecvDataSegmentLength) <
213 conn->sess->sess_ops->MaxBurstLength) {
214 dr->read_data_done +=
215 conn->conn_ops->MaxRecvDataSegmentLength;
216 dr->next_burst_len +=
217 conn->conn_ops->MaxRecvDataSegmentLength;
218 } else {
219 dr->read_data_done +=
220 (conn->sess->sess_ops->MaxBurstLength -
221 dr->next_burst_len);
222 dr->next_burst_len = 0;
223 pdu_start += data_sn_count;
224 data_sn_count = 0;
225 seq_no++;
226 }
227 }
228
229 if (!conn->sess->sess_ops->DataPDUInOrder) {
230 cmd->seq_no = seq_no;
231 cmd->pdu_start = pdu_start;
232 cmd->pdu_send_order = data_sn_count;
233 }
234
235 return 0;
236 }
237
238 /*
239 * Generates Offsets and NextBurstLength based on Begrun and Runlength
240 * carried in a Data SNACK or ExpDataSN in TMR TASK_REASSIGN.
241 *
242 * For DataSequenceInOrder=No and DataPDUInOrder=[Yes,No] only.
243 *
244 * FIXME: How is this handled for a RData SNACK?
245 */
246 int iscsit_create_recovery_datain_values_datasequenceinorder_no(
247 struct iscsi_cmd *cmd,
248 struct iscsi_datain_req *dr)
249 {
250 int found_seq = 0, i;
251 u32 data_sn, read_data_done = 0, seq_send_order = 0;
252 u32 begrun = dr->begrun;
253 u32 runlength = dr->runlength;
254 struct iscsi_conn *conn = cmd->conn;
255 struct iscsi_seq *first_seq = NULL, *seq = NULL;
256
257 if (!cmd->seq_list) {
258 pr_err("struct iscsi_cmd->seq_list is NULL!\n");
259 return -1;
260 }
261
262 /*
263 * Calculate read_data_done for all sequences containing a
264 * first_datasn and last_datasn less than the BegRun.
265 *
266 * Locate the struct iscsi_seq the BegRun lies within and calculate
267 * NextBurstLenghth up to the DataSN based on MaxRecvDataSegmentLength.
268 *
269 * Also use struct iscsi_seq->seq_send_order to determine where to start.
270 */
271 for (i = 0; i < cmd->seq_count; i++) {
272 seq = &cmd->seq_list[i];
273
274 if (!seq->seq_send_order)
275 first_seq = seq;
276
277 /*
278 * No data has been transferred for this DataIN sequence, so the
279 * seq->first_datasn and seq->last_datasn have not been set.
280 */
281 if (!seq->sent) {
282 pr_err("Ignoring non-sent sequence 0x%08x ->"
283 " 0x%08x\n\n", seq->first_datasn,
284 seq->last_datasn);
285 continue;
286 }
287
288 /*
289 * This DataIN sequence is precedes the received BegRun, add the
290 * total xfer_len of the sequence to read_data_done and reset
291 * seq->pdu_send_order.
292 */
293 if ((seq->first_datasn < begrun) &&
294 (seq->last_datasn < begrun)) {
295 pr_err("Pre BegRun sequence 0x%08x ->"
296 " 0x%08x\n", seq->first_datasn,
297 seq->last_datasn);
298
299 read_data_done += cmd->seq_list[i].xfer_len;
300 seq->next_burst_len = seq->pdu_send_order = 0;
301 continue;
302 }
303
304 /*
305 * The BegRun lies within this DataIN sequence.
306 */
307 if ((seq->first_datasn <= begrun) &&
308 (seq->last_datasn >= begrun)) {
309 pr_err("Found sequence begrun: 0x%08x in"
310 " 0x%08x -> 0x%08x\n", begrun,
311 seq->first_datasn, seq->last_datasn);
312
313 seq_send_order = seq->seq_send_order;
314 data_sn = seq->first_datasn;
315 seq->next_burst_len = seq->pdu_send_order = 0;
316 found_seq = 1;
317
318 /*
319 * For DataPDUInOrder=Yes, while the first DataSN of
320 * the sequence is less than the received BegRun, add
321 * the MaxRecvDataSegmentLength to read_data_done and
322 * to the sequence's next_burst_len;
323 *
324 * For DataPDUInOrder=No, while the first DataSN of the
325 * sequence is less than the received BegRun, find the
326 * struct iscsi_pdu of the DataSN in question and add the
327 * MaxRecvDataSegmentLength to read_data_done and to the
328 * sequence's next_burst_len;
329 */
330 if (conn->sess->sess_ops->DataPDUInOrder) {
331 while (data_sn < begrun) {
332 seq->pdu_send_order++;
333 read_data_done +=
334 conn->conn_ops->MaxRecvDataSegmentLength;
335 seq->next_burst_len +=
336 conn->conn_ops->MaxRecvDataSegmentLength;
337 data_sn++;
338 }
339 } else {
340 int j;
341 struct iscsi_pdu *pdu;
342
343 while (data_sn < begrun) {
344 seq->pdu_send_order++;
345
346 for (j = 0; j < seq->pdu_count; j++) {
347 pdu = &cmd->pdu_list[
348 seq->pdu_start + j];
349 if (pdu->data_sn == data_sn) {
350 read_data_done +=
351 pdu->length;
352 seq->next_burst_len +=
353 pdu->length;
354 }
355 }
356 data_sn++;
357 }
358 }
359 continue;
360 }
361
362 /*
363 * This DataIN sequence is larger than the received BegRun,
364 * reset seq->pdu_send_order and continue.
365 */
366 if ((seq->first_datasn > begrun) ||
367 (seq->last_datasn > begrun)) {
368 pr_err("Post BegRun sequence 0x%08x -> 0x%08x\n",
369 seq->first_datasn, seq->last_datasn);
370
371 seq->next_burst_len = seq->pdu_send_order = 0;
372 continue;
373 }
374 }
375
376 if (!found_seq) {
377 if (!begrun) {
378 if (!first_seq) {
379 pr_err("ITT: 0x%08x, Begrun: 0x%08x"
380 " but first_seq is NULL\n",
381 cmd->init_task_tag, begrun);
382 return -1;
383 }
384 seq_send_order = first_seq->seq_send_order;
385 seq->next_burst_len = seq->pdu_send_order = 0;
386 goto done;
387 }
388
389 pr_err("Unable to locate struct iscsi_seq for ITT: 0x%08x,"
390 " BegRun: 0x%08x, RunLength: 0x%08x while"
391 " DataSequenceInOrder=No and DataPDUInOrder=%s.\n",
392 cmd->init_task_tag, begrun, runlength,
393 (conn->sess->sess_ops->DataPDUInOrder) ? "Yes" : "No");
394 return -1;
395 }
396
397 done:
398 dr->read_data_done = read_data_done;
399 dr->seq_send_order = seq_send_order;
400
401 return 0;
402 }
403
404 static int iscsit_handle_recovery_datain(
405 struct iscsi_cmd *cmd,
406 unsigned char *buf,
407 u32 begrun,
408 u32 runlength)
409 {
410 struct iscsi_conn *conn = cmd->conn;
411 struct iscsi_datain_req *dr;
412 struct se_cmd *se_cmd = &cmd->se_cmd;
413
414 if (!(se_cmd->transport_state & CMD_T_COMPLETE)) {
415 pr_err("Ignoring ITT: 0x%08x Data SNACK\n",
416 cmd->init_task_tag);
417 return 0;
418 }
419
420 /*
421 * Make sure the initiator is not requesting retransmission
422 * of DataSNs already acknowledged by a Data ACK SNACK.
423 */
424 if ((cmd->cmd_flags & ICF_GOT_DATACK_SNACK) &&
425 (begrun <= cmd->acked_data_sn)) {
426 pr_err("ITT: 0x%08x, Data SNACK requesting"
427 " retransmission of DataSN: 0x%08x to 0x%08x but"
428 " already acked to DataSN: 0x%08x by Data ACK SNACK,"
429 " protocol error.\n", cmd->init_task_tag, begrun,
430 (begrun + runlength), cmd->acked_data_sn);
431
432 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
433 1, 0, buf, cmd);
434 }
435
436 /*
437 * Make sure BegRun and RunLength in the Data SNACK are sane.
438 * Note: (cmd->data_sn - 1) will carry the maximum DataSN sent.
439 */
440 if ((begrun + runlength) > (cmd->data_sn - 1)) {
441 pr_err("Initiator requesting BegRun: 0x%08x, RunLength"
442 ": 0x%08x greater than maximum DataSN: 0x%08x.\n",
443 begrun, runlength, (cmd->data_sn - 1));
444 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
445 1, 0, buf, cmd);
446 }
447
448 dr = iscsit_allocate_datain_req();
449 if (!dr)
450 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
451 1, 0, buf, cmd);
452
453 dr->data_sn = dr->begrun = begrun;
454 dr->runlength = runlength;
455 dr->generate_recovery_values = 1;
456 dr->recovery = DATAIN_WITHIN_COMMAND_RECOVERY;
457
458 iscsit_attach_datain_req(cmd, dr);
459
460 cmd->i_state = ISTATE_SEND_DATAIN;
461 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
462
463 return 0;
464 }
465
466 int iscsit_handle_recovery_datain_or_r2t(
467 struct iscsi_conn *conn,
468 unsigned char *buf,
469 u32 init_task_tag,
470 u32 targ_xfer_tag,
471 u32 begrun,
472 u32 runlength)
473 {
474 struct iscsi_cmd *cmd;
475
476 cmd = iscsit_find_cmd_from_itt(conn, init_task_tag);
477 if (!cmd)
478 return 0;
479
480 /*
481 * FIXME: This will not work for bidi commands.
482 */
483 switch (cmd->data_direction) {
484 case DMA_TO_DEVICE:
485 return iscsit_handle_r2t_snack(cmd, buf, begrun, runlength);
486 case DMA_FROM_DEVICE:
487 return iscsit_handle_recovery_datain(cmd, buf, begrun,
488 runlength);
489 default:
490 pr_err("Unknown cmd->data_direction: 0x%02x\n",
491 cmd->data_direction);
492 return -1;
493 }
494
495 return 0;
496 }
497
498 /* #warning FIXME: Status SNACK needs to be dependent on OPCODE!!! */
499 int iscsit_handle_status_snack(
500 struct iscsi_conn *conn,
501 u32 init_task_tag,
502 u32 targ_xfer_tag,
503 u32 begrun,
504 u32 runlength)
505 {
506 struct iscsi_cmd *cmd = NULL;
507 u32 last_statsn;
508 int found_cmd;
509
510 if (conn->exp_statsn > begrun) {
511 pr_err("Got Status SNACK Begrun: 0x%08x, RunLength:"
512 " 0x%08x but already got ExpStatSN: 0x%08x on CID:"
513 " %hu.\n", begrun, runlength, conn->exp_statsn,
514 conn->cid);
515 return 0;
516 }
517
518 last_statsn = (!runlength) ? conn->stat_sn : (begrun + runlength);
519
520 while (begrun < last_statsn) {
521 found_cmd = 0;
522
523 spin_lock_bh(&conn->cmd_lock);
524 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
525 if (cmd->stat_sn == begrun) {
526 found_cmd = 1;
527 break;
528 }
529 }
530 spin_unlock_bh(&conn->cmd_lock);
531
532 if (!found_cmd) {
533 pr_err("Unable to find StatSN: 0x%08x for"
534 " a Status SNACK, assuming this was a"
535 " protactic SNACK for an untransmitted"
536 " StatSN, ignoring.\n", begrun);
537 begrun++;
538 continue;
539 }
540
541 spin_lock_bh(&cmd->istate_lock);
542 if (cmd->i_state == ISTATE_SEND_DATAIN) {
543 spin_unlock_bh(&cmd->istate_lock);
544 pr_err("Ignoring Status SNACK for BegRun:"
545 " 0x%08x, RunLength: 0x%08x, assuming this was"
546 " a protactic SNACK for an untransmitted"
547 " StatSN\n", begrun, runlength);
548 begrun++;
549 continue;
550 }
551 spin_unlock_bh(&cmd->istate_lock);
552
553 cmd->i_state = ISTATE_SEND_STATUS_RECOVERY;
554 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
555 begrun++;
556 }
557
558 return 0;
559 }
560
561 int iscsit_handle_data_ack(
562 struct iscsi_conn *conn,
563 u32 targ_xfer_tag,
564 u32 begrun,
565 u32 runlength)
566 {
567 struct iscsi_cmd *cmd = NULL;
568
569 cmd = iscsit_find_cmd_from_ttt(conn, targ_xfer_tag);
570 if (!cmd) {
571 pr_err("Data ACK SNACK for TTT: 0x%08x is"
572 " invalid.\n", targ_xfer_tag);
573 return -1;
574 }
575
576 if (begrun <= cmd->acked_data_sn) {
577 pr_err("ITT: 0x%08x Data ACK SNACK BegRUN: 0x%08x is"
578 " less than the already acked DataSN: 0x%08x.\n",
579 cmd->init_task_tag, begrun, cmd->acked_data_sn);
580 return -1;
581 }
582
583 /*
584 * For Data ACK SNACK, BegRun is the next expected DataSN.
585 * (see iSCSI v19: 10.16.6)
586 */
587 cmd->cmd_flags |= ICF_GOT_DATACK_SNACK;
588 cmd->acked_data_sn = (begrun - 1);
589
590 pr_debug("Received Data ACK SNACK for ITT: 0x%08x,"
591 " updated acked DataSN to 0x%08x.\n",
592 cmd->init_task_tag, cmd->acked_data_sn);
593
594 return 0;
595 }
596
597 static int iscsit_send_recovery_r2t(
598 struct iscsi_cmd *cmd,
599 u32 offset,
600 u32 xfer_len)
601 {
602 int ret;
603
604 spin_lock_bh(&cmd->r2t_lock);
605 ret = iscsit_add_r2t_to_list(cmd, offset, xfer_len, 1, 0);
606 spin_unlock_bh(&cmd->r2t_lock);
607
608 return ret;
609 }
610
611 int iscsit_dataout_datapduinorder_no_fbit(
612 struct iscsi_cmd *cmd,
613 struct iscsi_pdu *pdu)
614 {
615 int i, send_recovery_r2t = 0, recovery = 0;
616 u32 length = 0, offset = 0, pdu_count = 0, xfer_len = 0;
617 struct iscsi_conn *conn = cmd->conn;
618 struct iscsi_pdu *first_pdu = NULL;
619
620 /*
621 * Get an struct iscsi_pdu pointer to the first PDU, and total PDU count
622 * of the DataOUT sequence.
623 */
624 if (conn->sess->sess_ops->DataSequenceInOrder) {
625 for (i = 0; i < cmd->pdu_count; i++) {
626 if (cmd->pdu_list[i].seq_no == pdu->seq_no) {
627 if (!first_pdu)
628 first_pdu = &cmd->pdu_list[i];
629 xfer_len += cmd->pdu_list[i].length;
630 pdu_count++;
631 } else if (pdu_count)
632 break;
633 }
634 } else {
635 struct iscsi_seq *seq = cmd->seq_ptr;
636
637 first_pdu = &cmd->pdu_list[seq->pdu_start];
638 pdu_count = seq->pdu_count;
639 }
640
641 if (!first_pdu || !pdu_count)
642 return DATAOUT_CANNOT_RECOVER;
643
644 /*
645 * Loop through the ending DataOUT Sequence checking each struct iscsi_pdu.
646 * The following ugly logic does batching of not received PDUs.
647 */
648 for (i = 0; i < pdu_count; i++) {
649 if (first_pdu[i].status == ISCSI_PDU_RECEIVED_OK) {
650 if (!send_recovery_r2t)
651 continue;
652
653 if (iscsit_send_recovery_r2t(cmd, offset, length) < 0)
654 return DATAOUT_CANNOT_RECOVER;
655
656 send_recovery_r2t = length = offset = 0;
657 continue;
658 }
659 /*
660 * Set recovery = 1 for any missing, CRC failed, or timed
661 * out PDUs to let the DataOUT logic know that this sequence
662 * has not been completed yet.
663 *
664 * Also, only send a Recovery R2T for ISCSI_PDU_NOT_RECEIVED.
665 * We assume if the PDU either failed CRC or timed out
666 * that a Recovery R2T has already been sent.
667 */
668 recovery = 1;
669
670 if (first_pdu[i].status != ISCSI_PDU_NOT_RECEIVED)
671 continue;
672
673 if (!offset)
674 offset = first_pdu[i].offset;
675 length += first_pdu[i].length;
676
677 send_recovery_r2t = 1;
678 }
679
680 if (send_recovery_r2t)
681 if (iscsit_send_recovery_r2t(cmd, offset, length) < 0)
682 return DATAOUT_CANNOT_RECOVER;
683
684 return (!recovery) ? DATAOUT_NORMAL : DATAOUT_WITHIN_COMMAND_RECOVERY;
685 }
686
687 static int iscsit_recalculate_dataout_values(
688 struct iscsi_cmd *cmd,
689 u32 pdu_offset,
690 u32 pdu_length,
691 u32 *r2t_offset,
692 u32 *r2t_length)
693 {
694 int i;
695 struct iscsi_conn *conn = cmd->conn;
696 struct iscsi_pdu *pdu = NULL;
697
698 if (conn->sess->sess_ops->DataSequenceInOrder) {
699 cmd->data_sn = 0;
700
701 if (conn->sess->sess_ops->DataPDUInOrder) {
702 *r2t_offset = cmd->write_data_done;
703 *r2t_length = (cmd->seq_end_offset -
704 cmd->write_data_done);
705 return 0;
706 }
707
708 *r2t_offset = cmd->seq_start_offset;
709 *r2t_length = (cmd->seq_end_offset - cmd->seq_start_offset);
710
711 for (i = 0; i < cmd->pdu_count; i++) {
712 pdu = &cmd->pdu_list[i];
713
714 if (pdu->status != ISCSI_PDU_RECEIVED_OK)
715 continue;
716
717 if ((pdu->offset >= cmd->seq_start_offset) &&
718 ((pdu->offset + pdu->length) <=
719 cmd->seq_end_offset)) {
720 if (!cmd->unsolicited_data)
721 cmd->next_burst_len -= pdu->length;
722 else
723 cmd->first_burst_len -= pdu->length;
724
725 cmd->write_data_done -= pdu->length;
726 pdu->status = ISCSI_PDU_NOT_RECEIVED;
727 }
728 }
729 } else {
730 struct iscsi_seq *seq = NULL;
731
732 seq = iscsit_get_seq_holder(cmd, pdu_offset, pdu_length);
733 if (!seq)
734 return -1;
735
736 *r2t_offset = seq->orig_offset;
737 *r2t_length = seq->xfer_len;
738
739 cmd->write_data_done -= (seq->offset - seq->orig_offset);
740 if (cmd->immediate_data)
741 cmd->first_burst_len = cmd->write_data_done;
742
743 seq->data_sn = 0;
744 seq->offset = seq->orig_offset;
745 seq->next_burst_len = 0;
746 seq->status = DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY;
747
748 if (conn->sess->sess_ops->DataPDUInOrder)
749 return 0;
750
751 for (i = 0; i < seq->pdu_count; i++) {
752 pdu = &cmd->pdu_list[i+seq->pdu_start];
753
754 if (pdu->status != ISCSI_PDU_RECEIVED_OK)
755 continue;
756
757 pdu->status = ISCSI_PDU_NOT_RECEIVED;
758 }
759 }
760
761 return 0;
762 }
763
764 int iscsit_recover_dataout_sequence(
765 struct iscsi_cmd *cmd,
766 u32 pdu_offset,
767 u32 pdu_length)
768 {
769 u32 r2t_length = 0, r2t_offset = 0;
770
771 spin_lock_bh(&cmd->istate_lock);
772 cmd->cmd_flags |= ICF_WITHIN_COMMAND_RECOVERY;
773 spin_unlock_bh(&cmd->istate_lock);
774
775 if (iscsit_recalculate_dataout_values(cmd, pdu_offset, pdu_length,
776 &r2t_offset, &r2t_length) < 0)
777 return DATAOUT_CANNOT_RECOVER;
778
779 iscsit_send_recovery_r2t(cmd, r2t_offset, r2t_length);
780
781 return DATAOUT_WITHIN_COMMAND_RECOVERY;
782 }
783
784 static struct iscsi_ooo_cmdsn *iscsit_allocate_ooo_cmdsn(void)
785 {
786 struct iscsi_ooo_cmdsn *ooo_cmdsn = NULL;
787
788 ooo_cmdsn = kmem_cache_zalloc(lio_ooo_cache, GFP_ATOMIC);
789 if (!ooo_cmdsn) {
790 pr_err("Unable to allocate memory for"
791 " struct iscsi_ooo_cmdsn.\n");
792 return NULL;
793 }
794 INIT_LIST_HEAD(&ooo_cmdsn->ooo_list);
795
796 return ooo_cmdsn;
797 }
798
799 /*
800 * Called with sess->cmdsn_mutex held.
801 */
802 static int iscsit_attach_ooo_cmdsn(
803 struct iscsi_session *sess,
804 struct iscsi_ooo_cmdsn *ooo_cmdsn)
805 {
806 struct iscsi_ooo_cmdsn *ooo_tail, *ooo_tmp;
807 /*
808 * We attach the struct iscsi_ooo_cmdsn entry to the out of order
809 * list in increasing CmdSN order.
810 * This allows iscsi_execute_ooo_cmdsns() to detect any
811 * additional CmdSN holes while performing delayed execution.
812 */
813 if (list_empty(&sess->sess_ooo_cmdsn_list))
814 list_add_tail(&ooo_cmdsn->ooo_list,
815 &sess->sess_ooo_cmdsn_list);
816 else {
817 ooo_tail = list_entry(sess->sess_ooo_cmdsn_list.prev,
818 typeof(*ooo_tail), ooo_list);
819 /*
820 * CmdSN is greater than the tail of the list.
821 */
822 if (ooo_tail->cmdsn < ooo_cmdsn->cmdsn)
823 list_add_tail(&ooo_cmdsn->ooo_list,
824 &sess->sess_ooo_cmdsn_list);
825 else {
826 /*
827 * CmdSN is either lower than the head, or somewhere
828 * in the middle.
829 */
830 list_for_each_entry(ooo_tmp, &sess->sess_ooo_cmdsn_list,
831 ooo_list) {
832 if (ooo_tmp->cmdsn < ooo_cmdsn->cmdsn)
833 continue;
834
835 list_add(&ooo_cmdsn->ooo_list,
836 &ooo_tmp->ooo_list);
837 break;
838 }
839 }
840 }
841
842 return 0;
843 }
844
845 /*
846 * Removes an struct iscsi_ooo_cmdsn from a session's list,
847 * called with struct iscsi_session->cmdsn_mutex held.
848 */
849 void iscsit_remove_ooo_cmdsn(
850 struct iscsi_session *sess,
851 struct iscsi_ooo_cmdsn *ooo_cmdsn)
852 {
853 list_del(&ooo_cmdsn->ooo_list);
854 kmem_cache_free(lio_ooo_cache, ooo_cmdsn);
855 }
856
857 void iscsit_clear_ooo_cmdsns_for_conn(struct iscsi_conn *conn)
858 {
859 struct iscsi_ooo_cmdsn *ooo_cmdsn;
860 struct iscsi_session *sess = conn->sess;
861
862 mutex_lock(&sess->cmdsn_mutex);
863 list_for_each_entry(ooo_cmdsn, &sess->sess_ooo_cmdsn_list, ooo_list) {
864 if (ooo_cmdsn->cid != conn->cid)
865 continue;
866
867 ooo_cmdsn->cmd = NULL;
868 }
869 mutex_unlock(&sess->cmdsn_mutex);
870 }
871
872 /*
873 * Called with sess->cmdsn_mutex held.
874 */
875 int iscsit_execute_ooo_cmdsns(struct iscsi_session *sess)
876 {
877 int ooo_count = 0;
878 struct iscsi_cmd *cmd = NULL;
879 struct iscsi_ooo_cmdsn *ooo_cmdsn, *ooo_cmdsn_tmp;
880
881 list_for_each_entry_safe(ooo_cmdsn, ooo_cmdsn_tmp,
882 &sess->sess_ooo_cmdsn_list, ooo_list) {
883 if (ooo_cmdsn->cmdsn != sess->exp_cmd_sn)
884 continue;
885
886 if (!ooo_cmdsn->cmd) {
887 sess->exp_cmd_sn++;
888 iscsit_remove_ooo_cmdsn(sess, ooo_cmdsn);
889 continue;
890 }
891
892 cmd = ooo_cmdsn->cmd;
893 cmd->i_state = cmd->deferred_i_state;
894 ooo_count++;
895 sess->exp_cmd_sn++;
896 pr_debug("Executing out of order CmdSN: 0x%08x,"
897 " incremented ExpCmdSN to 0x%08x.\n",
898 cmd->cmd_sn, sess->exp_cmd_sn);
899
900 iscsit_remove_ooo_cmdsn(sess, ooo_cmdsn);
901
902 if (iscsit_execute_cmd(cmd, 1) < 0)
903 return -1;
904
905 continue;
906 }
907
908 return ooo_count;
909 }
910
911 /*
912 * Called either:
913 *
914 * 1. With sess->cmdsn_mutex held from iscsi_execute_ooo_cmdsns()
915 * or iscsi_check_received_cmdsn().
916 * 2. With no locks held directly from iscsi_handle_XXX_pdu() functions
917 * for immediate commands.
918 */
919 int iscsit_execute_cmd(struct iscsi_cmd *cmd, int ooo)
920 {
921 struct se_cmd *se_cmd = &cmd->se_cmd;
922 int lr = 0;
923
924 spin_lock_bh(&cmd->istate_lock);
925 if (ooo)
926 cmd->cmd_flags &= ~ICF_OOO_CMDSN;
927
928 switch (cmd->iscsi_opcode) {
929 case ISCSI_OP_SCSI_CMD:
930 /*
931 * Go ahead and send the CHECK_CONDITION status for
932 * any SCSI CDB exceptions that may have occurred, also
933 * handle the SCF_SCSI_RESERVATION_CONFLICT case here as well.
934 */
935 if (se_cmd->se_cmd_flags & SCF_SCSI_CDB_EXCEPTION) {
936 if (se_cmd->scsi_sense_reason == TCM_RESERVATION_CONFLICT) {
937 cmd->i_state = ISTATE_SEND_STATUS;
938 spin_unlock_bh(&cmd->istate_lock);
939 iscsit_add_cmd_to_response_queue(cmd, cmd->conn,
940 cmd->i_state);
941 return 0;
942 }
943 spin_unlock_bh(&cmd->istate_lock);
944 /*
945 * Determine if delayed TASK_ABORTED status for WRITEs
946 * should be sent now if no unsolicited data out
947 * payloads are expected, or if the delayed status
948 * should be sent after unsolicited data out with
949 * ISCSI_FLAG_CMD_FINAL set in iscsi_handle_data_out()
950 */
951 if (transport_check_aborted_status(se_cmd,
952 (cmd->unsolicited_data == 0)) != 0)
953 return 0;
954 /*
955 * Otherwise send CHECK_CONDITION and sense for
956 * exception
957 */
958 return transport_send_check_condition_and_sense(se_cmd,
959 se_cmd->scsi_sense_reason, 0);
960 }
961 /*
962 * Special case for delayed CmdSN with Immediate
963 * Data and/or Unsolicited Data Out attached.
964 */
965 if (cmd->immediate_data) {
966 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
967 spin_unlock_bh(&cmd->istate_lock);
968 target_execute_cmd(&cmd->se_cmd);
969 return 0;
970 }
971 spin_unlock_bh(&cmd->istate_lock);
972
973 if (!(cmd->cmd_flags &
974 ICF_NON_IMMEDIATE_UNSOLICITED_DATA)) {
975 /*
976 * Send the delayed TASK_ABORTED status for
977 * WRITEs if no more unsolicitied data is
978 * expected.
979 */
980 if (transport_check_aborted_status(se_cmd, 1)
981 != 0)
982 return 0;
983
984 iscsit_set_dataout_sequence_values(cmd);
985 iscsit_build_r2ts_for_cmd(cmd, cmd->conn, false);
986 }
987 return 0;
988 }
989 /*
990 * The default handler.
991 */
992 spin_unlock_bh(&cmd->istate_lock);
993
994 if ((cmd->data_direction == DMA_TO_DEVICE) &&
995 !(cmd->cmd_flags & ICF_NON_IMMEDIATE_UNSOLICITED_DATA)) {
996 /*
997 * Send the delayed TASK_ABORTED status for WRITEs if
998 * no more nsolicitied data is expected.
999 */
1000 if (transport_check_aborted_status(se_cmd, 1) != 0)
1001 return 0;
1002
1003 iscsit_set_dataout_sequence_values(cmd);
1004 spin_lock_bh(&cmd->dataout_timeout_lock);
1005 iscsit_start_dataout_timer(cmd, cmd->conn);
1006 spin_unlock_bh(&cmd->dataout_timeout_lock);
1007 }
1008 return transport_handle_cdb_direct(&cmd->se_cmd);
1009
1010 case ISCSI_OP_NOOP_OUT:
1011 case ISCSI_OP_TEXT:
1012 spin_unlock_bh(&cmd->istate_lock);
1013 iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
1014 break;
1015 case ISCSI_OP_SCSI_TMFUNC:
1016 if (se_cmd->se_cmd_flags & SCF_SCSI_CDB_EXCEPTION) {
1017 spin_unlock_bh(&cmd->istate_lock);
1018 iscsit_add_cmd_to_response_queue(cmd, cmd->conn,
1019 cmd->i_state);
1020 return 0;
1021 }
1022 spin_unlock_bh(&cmd->istate_lock);
1023
1024 return transport_generic_handle_tmr(&cmd->se_cmd);
1025 case ISCSI_OP_LOGOUT:
1026 spin_unlock_bh(&cmd->istate_lock);
1027 switch (cmd->logout_reason) {
1028 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
1029 lr = iscsit_logout_closesession(cmd, cmd->conn);
1030 break;
1031 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
1032 lr = iscsit_logout_closeconnection(cmd, cmd->conn);
1033 break;
1034 case ISCSI_LOGOUT_REASON_RECOVERY:
1035 lr = iscsit_logout_removeconnforrecovery(cmd, cmd->conn);
1036 break;
1037 default:
1038 pr_err("Unknown iSCSI Logout Request Code:"
1039 " 0x%02x\n", cmd->logout_reason);
1040 return -1;
1041 }
1042
1043 return lr;
1044 default:
1045 spin_unlock_bh(&cmd->istate_lock);
1046 pr_err("Cannot perform out of order execution for"
1047 " unknown iSCSI Opcode: 0x%02x\n", cmd->iscsi_opcode);
1048 return -1;
1049 }
1050
1051 return 0;
1052 }
1053
1054 void iscsit_free_all_ooo_cmdsns(struct iscsi_session *sess)
1055 {
1056 struct iscsi_ooo_cmdsn *ooo_cmdsn, *ooo_cmdsn_tmp;
1057
1058 mutex_lock(&sess->cmdsn_mutex);
1059 list_for_each_entry_safe(ooo_cmdsn, ooo_cmdsn_tmp,
1060 &sess->sess_ooo_cmdsn_list, ooo_list) {
1061
1062 list_del(&ooo_cmdsn->ooo_list);
1063 kmem_cache_free(lio_ooo_cache, ooo_cmdsn);
1064 }
1065 mutex_unlock(&sess->cmdsn_mutex);
1066 }
1067
1068 int iscsit_handle_ooo_cmdsn(
1069 struct iscsi_session *sess,
1070 struct iscsi_cmd *cmd,
1071 u32 cmdsn)
1072 {
1073 int batch = 0;
1074 struct iscsi_ooo_cmdsn *ooo_cmdsn = NULL, *ooo_tail = NULL;
1075
1076 cmd->deferred_i_state = cmd->i_state;
1077 cmd->i_state = ISTATE_DEFERRED_CMD;
1078 cmd->cmd_flags |= ICF_OOO_CMDSN;
1079
1080 if (list_empty(&sess->sess_ooo_cmdsn_list))
1081 batch = 1;
1082 else {
1083 ooo_tail = list_entry(sess->sess_ooo_cmdsn_list.prev,
1084 typeof(*ooo_tail), ooo_list);
1085 if (ooo_tail->cmdsn != (cmdsn - 1))
1086 batch = 1;
1087 }
1088
1089 ooo_cmdsn = iscsit_allocate_ooo_cmdsn();
1090 if (!ooo_cmdsn)
1091 return CMDSN_ERROR_CANNOT_RECOVER;
1092
1093 ooo_cmdsn->cmd = cmd;
1094 ooo_cmdsn->batch_count = (batch) ?
1095 (cmdsn - sess->exp_cmd_sn) : 1;
1096 ooo_cmdsn->cid = cmd->conn->cid;
1097 ooo_cmdsn->exp_cmdsn = sess->exp_cmd_sn;
1098 ooo_cmdsn->cmdsn = cmdsn;
1099
1100 if (iscsit_attach_ooo_cmdsn(sess, ooo_cmdsn) < 0) {
1101 kmem_cache_free(lio_ooo_cache, ooo_cmdsn);
1102 return CMDSN_ERROR_CANNOT_RECOVER;
1103 }
1104
1105 return CMDSN_HIGHER_THAN_EXP;
1106 }
1107
1108 static int iscsit_set_dataout_timeout_values(
1109 struct iscsi_cmd *cmd,
1110 u32 *offset,
1111 u32 *length)
1112 {
1113 struct iscsi_conn *conn = cmd->conn;
1114 struct iscsi_r2t *r2t;
1115
1116 if (cmd->unsolicited_data) {
1117 *offset = 0;
1118 *length = (conn->sess->sess_ops->FirstBurstLength >
1119 cmd->se_cmd.data_length) ?
1120 cmd->se_cmd.data_length :
1121 conn->sess->sess_ops->FirstBurstLength;
1122 return 0;
1123 }
1124
1125 spin_lock_bh(&cmd->r2t_lock);
1126 if (list_empty(&cmd->cmd_r2t_list)) {
1127 pr_err("cmd->cmd_r2t_list is empty!\n");
1128 spin_unlock_bh(&cmd->r2t_lock);
1129 return -1;
1130 }
1131
1132 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
1133 if (r2t->sent_r2t && !r2t->recovery_r2t && !r2t->seq_complete) {
1134 *offset = r2t->offset;
1135 *length = r2t->xfer_len;
1136 spin_unlock_bh(&cmd->r2t_lock);
1137 return 0;
1138 }
1139 }
1140 spin_unlock_bh(&cmd->r2t_lock);
1141
1142 pr_err("Unable to locate any incomplete DataOUT"
1143 " sequences for ITT: 0x%08x.\n", cmd->init_task_tag);
1144
1145 return -1;
1146 }
1147
1148 /*
1149 * NOTE: Called from interrupt (timer) context.
1150 */
1151 static void iscsit_handle_dataout_timeout(unsigned long data)
1152 {
1153 u32 pdu_length = 0, pdu_offset = 0;
1154 u32 r2t_length = 0, r2t_offset = 0;
1155 struct iscsi_cmd *cmd = (struct iscsi_cmd *) data;
1156 struct iscsi_conn *conn = cmd->conn;
1157 struct iscsi_session *sess = NULL;
1158 struct iscsi_node_attrib *na;
1159
1160 iscsit_inc_conn_usage_count(conn);
1161
1162 spin_lock_bh(&cmd->dataout_timeout_lock);
1163 if (cmd->dataout_timer_flags & ISCSI_TF_STOP) {
1164 spin_unlock_bh(&cmd->dataout_timeout_lock);
1165 iscsit_dec_conn_usage_count(conn);
1166 return;
1167 }
1168 cmd->dataout_timer_flags &= ~ISCSI_TF_RUNNING;
1169 sess = conn->sess;
1170 na = iscsit_tpg_get_node_attrib(sess);
1171
1172 if (!sess->sess_ops->ErrorRecoveryLevel) {
1173 pr_debug("Unable to recover from DataOut timeout while"
1174 " in ERL=0.\n");
1175 goto failure;
1176 }
1177
1178 if (++cmd->dataout_timeout_retries == na->dataout_timeout_retries) {
1179 pr_debug("Command ITT: 0x%08x exceeded max retries"
1180 " for DataOUT timeout %u, closing iSCSI connection.\n",
1181 cmd->init_task_tag, na->dataout_timeout_retries);
1182 goto failure;
1183 }
1184
1185 cmd->cmd_flags |= ICF_WITHIN_COMMAND_RECOVERY;
1186
1187 if (conn->sess->sess_ops->DataSequenceInOrder) {
1188 if (conn->sess->sess_ops->DataPDUInOrder) {
1189 pdu_offset = cmd->write_data_done;
1190 if ((pdu_offset + (conn->sess->sess_ops->MaxBurstLength -
1191 cmd->next_burst_len)) > cmd->se_cmd.data_length)
1192 pdu_length = (cmd->se_cmd.data_length -
1193 cmd->write_data_done);
1194 else
1195 pdu_length = (conn->sess->sess_ops->MaxBurstLength -
1196 cmd->next_burst_len);
1197 } else {
1198 pdu_offset = cmd->seq_start_offset;
1199 pdu_length = (cmd->seq_end_offset -
1200 cmd->seq_start_offset);
1201 }
1202 } else {
1203 if (iscsit_set_dataout_timeout_values(cmd, &pdu_offset,
1204 &pdu_length) < 0)
1205 goto failure;
1206 }
1207
1208 if (iscsit_recalculate_dataout_values(cmd, pdu_offset, pdu_length,
1209 &r2t_offset, &r2t_length) < 0)
1210 goto failure;
1211
1212 pr_debug("Command ITT: 0x%08x timed out waiting for"
1213 " completion of %sDataOUT Sequence Offset: %u, Length: %u\n",
1214 cmd->init_task_tag, (cmd->unsolicited_data) ? "Unsolicited " :
1215 "", r2t_offset, r2t_length);
1216
1217 if (iscsit_send_recovery_r2t(cmd, r2t_offset, r2t_length) < 0)
1218 goto failure;
1219
1220 iscsit_start_dataout_timer(cmd, conn);
1221 spin_unlock_bh(&cmd->dataout_timeout_lock);
1222 iscsit_dec_conn_usage_count(conn);
1223
1224 return;
1225
1226 failure:
1227 spin_unlock_bh(&cmd->dataout_timeout_lock);
1228 iscsit_cause_connection_reinstatement(conn, 0);
1229 iscsit_dec_conn_usage_count(conn);
1230 }
1231
1232 void iscsit_mod_dataout_timer(struct iscsi_cmd *cmd)
1233 {
1234 struct iscsi_conn *conn = cmd->conn;
1235 struct iscsi_session *sess = conn->sess;
1236 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1237
1238 spin_lock_bh(&cmd->dataout_timeout_lock);
1239 if (!(cmd->dataout_timer_flags & ISCSI_TF_RUNNING)) {
1240 spin_unlock_bh(&cmd->dataout_timeout_lock);
1241 return;
1242 }
1243
1244 mod_timer(&cmd->dataout_timer,
1245 (get_jiffies_64() + na->dataout_timeout * HZ));
1246 pr_debug("Updated DataOUT timer for ITT: 0x%08x",
1247 cmd->init_task_tag);
1248 spin_unlock_bh(&cmd->dataout_timeout_lock);
1249 }
1250
1251 /*
1252 * Called with cmd->dataout_timeout_lock held.
1253 */
1254 void iscsit_start_dataout_timer(
1255 struct iscsi_cmd *cmd,
1256 struct iscsi_conn *conn)
1257 {
1258 struct iscsi_session *sess = conn->sess;
1259 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1260
1261 if (cmd->dataout_timer_flags & ISCSI_TF_RUNNING)
1262 return;
1263
1264 pr_debug("Starting DataOUT timer for ITT: 0x%08x on"
1265 " CID: %hu.\n", cmd->init_task_tag, conn->cid);
1266
1267 init_timer(&cmd->dataout_timer);
1268 cmd->dataout_timer.expires = (get_jiffies_64() + na->dataout_timeout * HZ);
1269 cmd->dataout_timer.data = (unsigned long)cmd;
1270 cmd->dataout_timer.function = iscsit_handle_dataout_timeout;
1271 cmd->dataout_timer_flags &= ~ISCSI_TF_STOP;
1272 cmd->dataout_timer_flags |= ISCSI_TF_RUNNING;
1273 add_timer(&cmd->dataout_timer);
1274 }
1275
1276 void iscsit_stop_dataout_timer(struct iscsi_cmd *cmd)
1277 {
1278 spin_lock_bh(&cmd->dataout_timeout_lock);
1279 if (!(cmd->dataout_timer_flags & ISCSI_TF_RUNNING)) {
1280 spin_unlock_bh(&cmd->dataout_timeout_lock);
1281 return;
1282 }
1283 cmd->dataout_timer_flags |= ISCSI_TF_STOP;
1284 spin_unlock_bh(&cmd->dataout_timeout_lock);
1285
1286 del_timer_sync(&cmd->dataout_timer);
1287
1288 spin_lock_bh(&cmd->dataout_timeout_lock);
1289 cmd->dataout_timer_flags &= ~ISCSI_TF_RUNNING;
1290 pr_debug("Stopped DataOUT Timer for ITT: 0x%08x\n",
1291 cmd->init_task_tag);
1292 spin_unlock_bh(&cmd->dataout_timeout_lock);
1293 }
Linux ARM platform port for MOXA ART SoC