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PM / sleep: Asynchronous threads for suspend_noirq
[linux/fpc-iii.git] / drivers / target / iscsi / iscsi_target_erl1.c
blobcda4d80cfaef999e45e4ac8a6b894513a3a44ad6
1 /*******************************************************************************
2 * This file contains error recovery level one used by the iSCSI Target driver.
3 *
4 * (c) Copyright 2007-2013 Datera, Inc.
5 *
6 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 ******************************************************************************/
18
19 #include <linux/list.h>
20 #include <scsi/iscsi_proto.h>
21 #include <target/target_core_base.h>
22 #include <target/target_core_fabric.h>
23 #include <target/iscsi/iscsi_transport.h>
24
25 #include "iscsi_target_core.h"
26 #include "iscsi_target_seq_pdu_list.h"
27 #include "iscsi_target_datain_values.h"
28 #include "iscsi_target_device.h"
29 #include "iscsi_target_tpg.h"
30 #include "iscsi_target_util.h"
31 #include "iscsi_target_erl0.h"
32 #include "iscsi_target_erl1.h"
33 #include "iscsi_target_erl2.h"
34 #include "iscsi_target.h"
35
36 #define OFFLOAD_BUF_SIZE 32768
37
38 /*
39 * Used to dump excess datain payload for certain error recovery
40 * situations. Receive in OFFLOAD_BUF_SIZE max of datain per rx_data().
41 *
42 * dump_padding_digest denotes if padding and data digests need
43 * to be dumped.
44 */
45 int iscsit_dump_data_payload(
46 struct iscsi_conn *conn,
47 u32 buf_len,
48 int dump_padding_digest)
49 {
50 char *buf, pad_bytes[4];
51 int ret = DATAOUT_WITHIN_COMMAND_RECOVERY, rx_got;
52 u32 length, padding, offset = 0, size;
53 struct kvec iov;
54
55 if (conn->sess->sess_ops->RDMAExtensions)
56 return 0;
57
58 length = (buf_len > OFFLOAD_BUF_SIZE) ? OFFLOAD_BUF_SIZE : buf_len;
59
60 buf = kzalloc(length, GFP_ATOMIC);
61 if (!buf) {
62 pr_err("Unable to allocate %u bytes for offload"
63 " buffer.\n", length);
64 return -1;
65 }
66 memset(&iov, 0, sizeof(struct kvec));
67
68 while (offset < buf_len) {
69 size = ((offset + length) > buf_len) ?
70 (buf_len - offset) : length;
71
72 iov.iov_len = size;
73 iov.iov_base = buf;
74
75 rx_got = rx_data(conn, &iov, 1, size);
76 if (rx_got != size) {
77 ret = DATAOUT_CANNOT_RECOVER;
78 goto out;
79 }
80
81 offset += size;
82 }
83
84 if (!dump_padding_digest)
85 goto out;
86
87 padding = ((-buf_len) & 3);
88 if (padding != 0) {
89 iov.iov_len = padding;
90 iov.iov_base = pad_bytes;
91
92 rx_got = rx_data(conn, &iov, 1, padding);
93 if (rx_got != padding) {
94 ret = DATAOUT_CANNOT_RECOVER;
95 goto out;
96 }
97 }
98
99 if (conn->conn_ops->DataDigest) {
100 u32 data_crc;
101
102 iov.iov_len = ISCSI_CRC_LEN;
103 iov.iov_base = &data_crc;
104
105 rx_got = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
106 if (rx_got != ISCSI_CRC_LEN) {
107 ret = DATAOUT_CANNOT_RECOVER;
108 goto out;
109 }
110 }
111
112 out:
113 kfree(buf);
114 return ret;
115 }
116
117 /*
118 * Used for retransmitting R2Ts from a R2T SNACK request.
119 */
120 static int iscsit_send_recovery_r2t_for_snack(
121 struct iscsi_cmd *cmd,
122 struct iscsi_r2t *r2t)
123 {
124 /*
125 * If the struct iscsi_r2t has not been sent yet, we can safely
126 * ignore retransmission
127 * of the R2TSN in question.
128 */
129 spin_lock_bh(&cmd->r2t_lock);
130 if (!r2t->sent_r2t) {
131 spin_unlock_bh(&cmd->r2t_lock);
132 return 0;
133 }
134 r2t->sent_r2t = 0;
135 spin_unlock_bh(&cmd->r2t_lock);
136
137 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, ISTATE_SEND_R2T);
138
139 return 0;
140 }
141
142 static int iscsit_handle_r2t_snack(
143 struct iscsi_cmd *cmd,
144 unsigned char *buf,
145 u32 begrun,
146 u32 runlength)
147 {
148 u32 last_r2tsn;
149 struct iscsi_r2t *r2t;
150
151 /*
152 * Make sure the initiator is not requesting retransmission
153 * of R2TSNs already acknowledged by a TMR TASK_REASSIGN.
154 */
155 if ((cmd->cmd_flags & ICF_GOT_DATACK_SNACK) &&
156 (begrun <= cmd->acked_data_sn)) {
157 pr_err("ITT: 0x%08x, R2T SNACK requesting"
158 " retransmission of R2TSN: 0x%08x to 0x%08x but already"
159 " acked to R2TSN: 0x%08x by TMR TASK_REASSIGN,"
160 " protocol error.\n", cmd->init_task_tag, begrun,
161 (begrun + runlength), cmd->acked_data_sn);
162
163 return iscsit_reject_cmd(cmd,
164 ISCSI_REASON_PROTOCOL_ERROR, buf);
165 }
166
167 if (runlength) {
168 if ((begrun + runlength) > cmd->r2t_sn) {
169 pr_err("Command ITT: 0x%08x received R2T SNACK"
170 " with BegRun: 0x%08x, RunLength: 0x%08x, exceeds"
171 " current R2TSN: 0x%08x, protocol error.\n",
172 cmd->init_task_tag, begrun, runlength, cmd->r2t_sn);
173 return iscsit_reject_cmd(cmd,
174 ISCSI_REASON_BOOKMARK_INVALID, buf);
175 }
176 last_r2tsn = (begrun + runlength);
177 } else
178 last_r2tsn = cmd->r2t_sn;
179
180 while (begrun < last_r2tsn) {
181 r2t = iscsit_get_holder_for_r2tsn(cmd, begrun);
182 if (!r2t)
183 return -1;
184 if (iscsit_send_recovery_r2t_for_snack(cmd, r2t) < 0)
185 return -1;
186
187 begrun++;
188 }
189
190 return 0;
191 }
192
193 /*
194 * Generates Offsets and NextBurstLength based on Begrun and Runlength
195 * carried in a Data SNACK or ExpDataSN in TMR TASK_REASSIGN.
196 *
197 * For DataSequenceInOrder=Yes and DataPDUInOrder=[Yes,No] only.
198 *
199 * FIXME: How is this handled for a RData SNACK?
200 */
201 int iscsit_create_recovery_datain_values_datasequenceinorder_yes(
202 struct iscsi_cmd *cmd,
203 struct iscsi_datain_req *dr)
204 {
205 u32 data_sn = 0, data_sn_count = 0;
206 u32 pdu_start = 0, seq_no = 0;
207 u32 begrun = dr->begrun;
208 struct iscsi_conn *conn = cmd->conn;
209
210 while (begrun > data_sn++) {
211 data_sn_count++;
212 if ((dr->next_burst_len +
213 conn->conn_ops->MaxRecvDataSegmentLength) <
214 conn->sess->sess_ops->MaxBurstLength) {
215 dr->read_data_done +=
216 conn->conn_ops->MaxRecvDataSegmentLength;
217 dr->next_burst_len +=
218 conn->conn_ops->MaxRecvDataSegmentLength;
219 } else {
220 dr->read_data_done +=
221 (conn->sess->sess_ops->MaxBurstLength -
222 dr->next_burst_len);
223 dr->next_burst_len = 0;
224 pdu_start += data_sn_count;
225 data_sn_count = 0;
226 seq_no++;
227 }
228 }
229
230 if (!conn->sess->sess_ops->DataPDUInOrder) {
231 cmd->seq_no = seq_no;
232 cmd->pdu_start = pdu_start;
233 cmd->pdu_send_order = data_sn_count;
234 }
235
236 return 0;
237 }
238
239 /*
240 * Generates Offsets and NextBurstLength based on Begrun and Runlength
241 * carried in a Data SNACK or ExpDataSN in TMR TASK_REASSIGN.
242 *
243 * For DataSequenceInOrder=No and DataPDUInOrder=[Yes,No] only.
244 *
245 * FIXME: How is this handled for a RData SNACK?
246 */
247 int iscsit_create_recovery_datain_values_datasequenceinorder_no(
248 struct iscsi_cmd *cmd,
249 struct iscsi_datain_req *dr)
250 {
251 int found_seq = 0, i;
252 u32 data_sn, read_data_done = 0, seq_send_order = 0;
253 u32 begrun = dr->begrun;
254 u32 runlength = dr->runlength;
255 struct iscsi_conn *conn = cmd->conn;
256 struct iscsi_seq *first_seq = NULL, *seq = NULL;
257
258 if (!cmd->seq_list) {
259 pr_err("struct iscsi_cmd->seq_list is NULL!\n");
260 return -1;
261 }
262
263 /*
264 * Calculate read_data_done for all sequences containing a
265 * first_datasn and last_datasn less than the BegRun.
266 *
267 * Locate the struct iscsi_seq the BegRun lies within and calculate
268 * NextBurstLenghth up to the DataSN based on MaxRecvDataSegmentLength.
269 *
270 * Also use struct iscsi_seq->seq_send_order to determine where to start.
271 */
272 for (i = 0; i < cmd->seq_count; i++) {
273 seq = &cmd->seq_list[i];
274
275 if (!seq->seq_send_order)
276 first_seq = seq;
277
278 /*
279 * No data has been transferred for this DataIN sequence, so the
280 * seq->first_datasn and seq->last_datasn have not been set.
281 */
282 if (!seq->sent) {
283 pr_err("Ignoring non-sent sequence 0x%08x ->"
284 " 0x%08x\n\n", seq->first_datasn,
285 seq->last_datasn);
286 continue;
287 }
288
289 /*
290 * This DataIN sequence is precedes the received BegRun, add the
291 * total xfer_len of the sequence to read_data_done and reset
292 * seq->pdu_send_order.
293 */
294 if ((seq->first_datasn < begrun) &&
295 (seq->last_datasn < begrun)) {
296 pr_err("Pre BegRun sequence 0x%08x ->"
297 " 0x%08x\n", seq->first_datasn,
298 seq->last_datasn);
299
300 read_data_done += cmd->seq_list[i].xfer_len;
301 seq->next_burst_len = seq->pdu_send_order = 0;
302 continue;
303 }
304
305 /*
306 * The BegRun lies within this DataIN sequence.
307 */
308 if ((seq->first_datasn <= begrun) &&
309 (seq->last_datasn >= begrun)) {
310 pr_err("Found sequence begrun: 0x%08x in"
311 " 0x%08x -> 0x%08x\n", begrun,
312 seq->first_datasn, seq->last_datasn);
313
314 seq_send_order = seq->seq_send_order;
315 data_sn = seq->first_datasn;
316 seq->next_burst_len = seq->pdu_send_order = 0;
317 found_seq = 1;
318
319 /*
320 * For DataPDUInOrder=Yes, while the first DataSN of
321 * the sequence is less than the received BegRun, add
322 * the MaxRecvDataSegmentLength to read_data_done and
323 * to the sequence's next_burst_len;
324 *
325 * For DataPDUInOrder=No, while the first DataSN of the
326 * sequence is less than the received BegRun, find the
327 * struct iscsi_pdu of the DataSN in question and add the
328 * MaxRecvDataSegmentLength to read_data_done and to the
329 * sequence's next_burst_len;
330 */
331 if (conn->sess->sess_ops->DataPDUInOrder) {
332 while (data_sn < begrun) {
333 seq->pdu_send_order++;
334 read_data_done +=
335 conn->conn_ops->MaxRecvDataSegmentLength;
336 seq->next_burst_len +=
337 conn->conn_ops->MaxRecvDataSegmentLength;
338 data_sn++;
339 }
340 } else {
341 int j;
342 struct iscsi_pdu *pdu;
343
344 while (data_sn < begrun) {
345 seq->pdu_send_order++;
346
347 for (j = 0; j < seq->pdu_count; j++) {
348 pdu = &cmd->pdu_list[
349 seq->pdu_start + j];
350 if (pdu->data_sn == data_sn) {
351 read_data_done +=
352 pdu->length;
353 seq->next_burst_len +=
354 pdu->length;
355 }
356 }
357 data_sn++;
358 }
359 }
360 continue;
361 }
362
363 /*
364 * This DataIN sequence is larger than the received BegRun,
365 * reset seq->pdu_send_order and continue.
366 */
367 if ((seq->first_datasn > begrun) ||
368 (seq->last_datasn > begrun)) {
369 pr_err("Post BegRun sequence 0x%08x -> 0x%08x\n",
370 seq->first_datasn, seq->last_datasn);
371
372 seq->next_burst_len = seq->pdu_send_order = 0;
373 continue;
374 }
375 }
376
377 if (!found_seq) {
378 if (!begrun) {
379 if (!first_seq) {
380 pr_err("ITT: 0x%08x, Begrun: 0x%08x"
381 " but first_seq is NULL\n",
382 cmd->init_task_tag, begrun);
383 return -1;
384 }
385 seq_send_order = first_seq->seq_send_order;
386 seq->next_burst_len = seq->pdu_send_order = 0;
387 goto done;
388 }
389
390 pr_err("Unable to locate struct iscsi_seq for ITT: 0x%08x,"
391 " BegRun: 0x%08x, RunLength: 0x%08x while"
392 " DataSequenceInOrder=No and DataPDUInOrder=%s.\n",
393 cmd->init_task_tag, begrun, runlength,
394 (conn->sess->sess_ops->DataPDUInOrder) ? "Yes" : "No");
395 return -1;
396 }
397
398 done:
399 dr->read_data_done = read_data_done;
400 dr->seq_send_order = seq_send_order;
401
402 return 0;
403 }
404
405 static int iscsit_handle_recovery_datain(
406 struct iscsi_cmd *cmd,
407 unsigned char *buf,
408 u32 begrun,
409 u32 runlength)
410 {
411 struct iscsi_conn *conn = cmd->conn;
412 struct iscsi_datain_req *dr;
413 struct se_cmd *se_cmd = &cmd->se_cmd;
414
415 if (!(se_cmd->transport_state & CMD_T_COMPLETE)) {
416 pr_err("Ignoring ITT: 0x%08x Data SNACK\n",
417 cmd->init_task_tag);
418 return 0;
419 }
420
421 /*
422 * Make sure the initiator is not requesting retransmission
423 * of DataSNs already acknowledged by a Data ACK SNACK.
424 */
425 if ((cmd->cmd_flags & ICF_GOT_DATACK_SNACK) &&
426 (begrun <= cmd->acked_data_sn)) {
427 pr_err("ITT: 0x%08x, Data SNACK requesting"
428 " retransmission of DataSN: 0x%08x to 0x%08x but"
429 " already acked to DataSN: 0x%08x by Data ACK SNACK,"
430 " protocol error.\n", cmd->init_task_tag, begrun,
431 (begrun + runlength), cmd->acked_data_sn);
432
433 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
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_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID,
445 buf);
446 }
447
448 dr = iscsit_allocate_datain_req();
449 if (!dr)
450 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_NO_RESOURCES,
451 buf);
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 itt_t 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 itt_t 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 (!begrun) {
511 begrun = conn->exp_statsn;
512 } else if (conn->exp_statsn > begrun) {
513 pr_err("Got Status SNACK Begrun: 0x%08x, RunLength:"
514 " 0x%08x but already got ExpStatSN: 0x%08x on CID:"
515 " %hu.\n", begrun, runlength, conn->exp_statsn,
516 conn->cid);
517 return 0;
518 }
519
520 last_statsn = (!runlength) ? conn->stat_sn : (begrun + runlength);
521
522 while (begrun < last_statsn) {
523 found_cmd = 0;
524
525 spin_lock_bh(&conn->cmd_lock);
526 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
527 if (cmd->stat_sn == begrun) {
528 found_cmd = 1;
529 break;
530 }
531 }
532 spin_unlock_bh(&conn->cmd_lock);
533
534 if (!found_cmd) {
535 pr_err("Unable to find StatSN: 0x%08x for"
536 " a Status SNACK, assuming this was a"
537 " protactic SNACK for an untransmitted"
538 " StatSN, ignoring.\n", begrun);
539 begrun++;
540 continue;
541 }
542
543 spin_lock_bh(&cmd->istate_lock);
544 if (cmd->i_state == ISTATE_SEND_DATAIN) {
545 spin_unlock_bh(&cmd->istate_lock);
546 pr_err("Ignoring Status SNACK for BegRun:"
547 " 0x%08x, RunLength: 0x%08x, assuming this was"
548 " a protactic SNACK for an untransmitted"
549 " StatSN\n", begrun, runlength);
550 begrun++;
551 continue;
552 }
553 spin_unlock_bh(&cmd->istate_lock);
554
555 cmd->i_state = ISTATE_SEND_STATUS_RECOVERY;
556 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
557 begrun++;
558 }
559
560 return 0;
561 }
562
563 int iscsit_handle_data_ack(
564 struct iscsi_conn *conn,
565 u32 targ_xfer_tag,
566 u32 begrun,
567 u32 runlength)
568 {
569 struct iscsi_cmd *cmd = NULL;
570
571 cmd = iscsit_find_cmd_from_ttt(conn, targ_xfer_tag);
572 if (!cmd) {
573 pr_err("Data ACK SNACK for TTT: 0x%08x is"
574 " invalid.\n", targ_xfer_tag);
575 return -1;
576 }
577
578 if (begrun <= cmd->acked_data_sn) {
579 pr_err("ITT: 0x%08x Data ACK SNACK BegRUN: 0x%08x is"
580 " less than the already acked DataSN: 0x%08x.\n",
581 cmd->init_task_tag, begrun, cmd->acked_data_sn);
582 return -1;
583 }
584
585 /*
586 * For Data ACK SNACK, BegRun is the next expected DataSN.
587 * (see iSCSI v19: 10.16.6)
588 */
589 cmd->cmd_flags |= ICF_GOT_DATACK_SNACK;
590 cmd->acked_data_sn = (begrun - 1);
591
592 pr_debug("Received Data ACK SNACK for ITT: 0x%08x,"
593 " updated acked DataSN to 0x%08x.\n",
594 cmd->init_task_tag, cmd->acked_data_sn);
595
596 return 0;
597 }
598
599 static int iscsit_send_recovery_r2t(
600 struct iscsi_cmd *cmd,
601 u32 offset,
602 u32 xfer_len)
603 {
604 int ret;
605
606 spin_lock_bh(&cmd->r2t_lock);
607 ret = iscsit_add_r2t_to_list(cmd, offset, xfer_len, 1, 0);
608 spin_unlock_bh(&cmd->r2t_lock);
609
610 return ret;
611 }
612
613 int iscsit_dataout_datapduinorder_no_fbit(
614 struct iscsi_cmd *cmd,
615 struct iscsi_pdu *pdu)
616 {
617 int i, send_recovery_r2t = 0, recovery = 0;
618 u32 length = 0, offset = 0, pdu_count = 0, xfer_len = 0;
619 struct iscsi_conn *conn = cmd->conn;
620 struct iscsi_pdu *first_pdu = NULL;
621
622 /*
623 * Get an struct iscsi_pdu pointer to the first PDU, and total PDU count
624 * of the DataOUT sequence.
625 */
626 if (conn->sess->sess_ops->DataSequenceInOrder) {
627 for (i = 0; i < cmd->pdu_count; i++) {
628 if (cmd->pdu_list[i].seq_no == pdu->seq_no) {
629 if (!first_pdu)
630 first_pdu = &cmd->pdu_list[i];
631 xfer_len += cmd->pdu_list[i].length;
632 pdu_count++;
633 } else if (pdu_count)
634 break;
635 }
636 } else {
637 struct iscsi_seq *seq = cmd->seq_ptr;
638
639 first_pdu = &cmd->pdu_list[seq->pdu_start];
640 pdu_count = seq->pdu_count;
641 }
642
643 if (!first_pdu || !pdu_count)
644 return DATAOUT_CANNOT_RECOVER;
645
646 /*
647 * Loop through the ending DataOUT Sequence checking each struct iscsi_pdu.
648 * The following ugly logic does batching of not received PDUs.
649 */
650 for (i = 0; i < pdu_count; i++) {
651 if (first_pdu[i].status == ISCSI_PDU_RECEIVED_OK) {
652 if (!send_recovery_r2t)
653 continue;
654
655 if (iscsit_send_recovery_r2t(cmd, offset, length) < 0)
656 return DATAOUT_CANNOT_RECOVER;
657
658 send_recovery_r2t = length = offset = 0;
659 continue;
660 }
661 /*
662 * Set recovery = 1 for any missing, CRC failed, or timed
663 * out PDUs to let the DataOUT logic know that this sequence
664 * has not been completed yet.
665 *
666 * Also, only send a Recovery R2T for ISCSI_PDU_NOT_RECEIVED.
667 * We assume if the PDU either failed CRC or timed out
668 * that a Recovery R2T has already been sent.
669 */
670 recovery = 1;
671
672 if (first_pdu[i].status != ISCSI_PDU_NOT_RECEIVED)
673 continue;
674
675 if (!offset)
676 offset = first_pdu[i].offset;
677 length += first_pdu[i].length;
678
679 send_recovery_r2t = 1;
680 }
681
682 if (send_recovery_r2t)
683 if (iscsit_send_recovery_r2t(cmd, offset, length) < 0)
684 return DATAOUT_CANNOT_RECOVER;
685
686 return (!recovery) ? DATAOUT_NORMAL : DATAOUT_WITHIN_COMMAND_RECOVERY;
687 }
688
689 static int iscsit_recalculate_dataout_values(
690 struct iscsi_cmd *cmd,
691 u32 pdu_offset,
692 u32 pdu_length,
693 u32 *r2t_offset,
694 u32 *r2t_length)
695 {
696 int i;
697 struct iscsi_conn *conn = cmd->conn;
698 struct iscsi_pdu *pdu = NULL;
699
700 if (conn->sess->sess_ops->DataSequenceInOrder) {
701 cmd->data_sn = 0;
702
703 if (conn->sess->sess_ops->DataPDUInOrder) {
704 *r2t_offset = cmd->write_data_done;
705 *r2t_length = (cmd->seq_end_offset -
706 cmd->write_data_done);
707 return 0;
708 }
709
710 *r2t_offset = cmd->seq_start_offset;
711 *r2t_length = (cmd->seq_end_offset - cmd->seq_start_offset);
712
713 for (i = 0; i < cmd->pdu_count; i++) {
714 pdu = &cmd->pdu_list[i];
715
716 if (pdu->status != ISCSI_PDU_RECEIVED_OK)
717 continue;
718
719 if ((pdu->offset >= cmd->seq_start_offset) &&
720 ((pdu->offset + pdu->length) <=
721 cmd->seq_end_offset)) {
722 if (!cmd->unsolicited_data)
723 cmd->next_burst_len -= pdu->length;
724 else
725 cmd->first_burst_len -= pdu->length;
726
727 cmd->write_data_done -= pdu->length;
728 pdu->status = ISCSI_PDU_NOT_RECEIVED;
729 }
730 }
731 } else {
732 struct iscsi_seq *seq = NULL;
733
734 seq = iscsit_get_seq_holder(cmd, pdu_offset, pdu_length);
735 if (!seq)
736 return -1;
737
738 *r2t_offset = seq->orig_offset;
739 *r2t_length = seq->xfer_len;
740
741 cmd->write_data_done -= (seq->offset - seq->orig_offset);
742 if (cmd->immediate_data)
743 cmd->first_burst_len = cmd->write_data_done;
744
745 seq->data_sn = 0;
746 seq->offset = seq->orig_offset;
747 seq->next_burst_len = 0;
748 seq->status = DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY;
749
750 if (conn->sess->sess_ops->DataPDUInOrder)
751 return 0;
752
753 for (i = 0; i < seq->pdu_count; i++) {
754 pdu = &cmd->pdu_list[i+seq->pdu_start];
755
756 if (pdu->status != ISCSI_PDU_RECEIVED_OK)
757 continue;
758
759 pdu->status = ISCSI_PDU_NOT_RECEIVED;
760 }
761 }
762
763 return 0;
764 }
765
766 int iscsit_recover_dataout_sequence(
767 struct iscsi_cmd *cmd,
768 u32 pdu_offset,
769 u32 pdu_length)
770 {
771 u32 r2t_length = 0, r2t_offset = 0;
772
773 spin_lock_bh(&cmd->istate_lock);
774 cmd->cmd_flags |= ICF_WITHIN_COMMAND_RECOVERY;
775 spin_unlock_bh(&cmd->istate_lock);
776
777 if (iscsit_recalculate_dataout_values(cmd, pdu_offset, pdu_length,
778 &r2t_offset, &r2t_length) < 0)
779 return DATAOUT_CANNOT_RECOVER;
780
781 iscsit_send_recovery_r2t(cmd, r2t_offset, r2t_length);
782
783 return DATAOUT_WITHIN_COMMAND_RECOVERY;
784 }
785
786 static struct iscsi_ooo_cmdsn *iscsit_allocate_ooo_cmdsn(void)
787 {
788 struct iscsi_ooo_cmdsn *ooo_cmdsn = NULL;
789
790 ooo_cmdsn = kmem_cache_zalloc(lio_ooo_cache, GFP_ATOMIC);
791 if (!ooo_cmdsn) {
792 pr_err("Unable to allocate memory for"
793 " struct iscsi_ooo_cmdsn.\n");
794 return NULL;
795 }
796 INIT_LIST_HEAD(&ooo_cmdsn->ooo_list);
797
798 return ooo_cmdsn;
799 }
800
801 /*
802 * Called with sess->cmdsn_mutex held.
803 */
804 static int iscsit_attach_ooo_cmdsn(
805 struct iscsi_session *sess,
806 struct iscsi_ooo_cmdsn *ooo_cmdsn)
807 {
808 struct iscsi_ooo_cmdsn *ooo_tail, *ooo_tmp;
809 /*
810 * We attach the struct iscsi_ooo_cmdsn entry to the out of order
811 * list in increasing CmdSN order.
812 * This allows iscsi_execute_ooo_cmdsns() to detect any
813 * additional CmdSN holes while performing delayed execution.
814 */
815 if (list_empty(&sess->sess_ooo_cmdsn_list))
816 list_add_tail(&ooo_cmdsn->ooo_list,
817 &sess->sess_ooo_cmdsn_list);
818 else {
819 ooo_tail = list_entry(sess->sess_ooo_cmdsn_list.prev,
820 typeof(*ooo_tail), ooo_list);
821 /*
822 * CmdSN is greater than the tail of the list.
823 */
824 if (iscsi_sna_lt(ooo_tail->cmdsn, ooo_cmdsn->cmdsn))
825 list_add_tail(&ooo_cmdsn->ooo_list,
826 &sess->sess_ooo_cmdsn_list);
827 else {
828 /*
829 * CmdSN is either lower than the head, or somewhere
830 * in the middle.
831 */
832 list_for_each_entry(ooo_tmp, &sess->sess_ooo_cmdsn_list,
833 ooo_list) {
834 if (iscsi_sna_lt(ooo_tmp->cmdsn, ooo_cmdsn->cmdsn))
835 continue;
836
837 /* Insert before this entry */
838 list_add(&ooo_cmdsn->ooo_list,
839 ooo_tmp->ooo_list.prev);
840 break;
841 }
842 }
843 }
844
845 return 0;
846 }
847
848 /*
849 * Removes an struct iscsi_ooo_cmdsn from a session's list,
850 * called with struct iscsi_session->cmdsn_mutex held.
851 */
852 void iscsit_remove_ooo_cmdsn(
853 struct iscsi_session *sess,
854 struct iscsi_ooo_cmdsn *ooo_cmdsn)
855 {
856 list_del(&ooo_cmdsn->ooo_list);
857 kmem_cache_free(lio_ooo_cache, ooo_cmdsn);
858 }
859
860 void iscsit_clear_ooo_cmdsns_for_conn(struct iscsi_conn *conn)
861 {
862 struct iscsi_ooo_cmdsn *ooo_cmdsn;
863 struct iscsi_session *sess = conn->sess;
864
865 mutex_lock(&sess->cmdsn_mutex);
866 list_for_each_entry(ooo_cmdsn, &sess->sess_ooo_cmdsn_list, ooo_list) {
867 if (ooo_cmdsn->cid != conn->cid)
868 continue;
869
870 ooo_cmdsn->cmd = NULL;
871 }
872 mutex_unlock(&sess->cmdsn_mutex);
873 }
874
875 /*
876 * Called with sess->cmdsn_mutex held.
877 */
878 int iscsit_execute_ooo_cmdsns(struct iscsi_session *sess)
879 {
880 int ooo_count = 0;
881 struct iscsi_cmd *cmd = NULL;
882 struct iscsi_ooo_cmdsn *ooo_cmdsn, *ooo_cmdsn_tmp;
883
884 list_for_each_entry_safe(ooo_cmdsn, ooo_cmdsn_tmp,
885 &sess->sess_ooo_cmdsn_list, ooo_list) {
886 if (ooo_cmdsn->cmdsn != sess->exp_cmd_sn)
887 continue;
888
889 if (!ooo_cmdsn->cmd) {
890 sess->exp_cmd_sn++;
891 iscsit_remove_ooo_cmdsn(sess, ooo_cmdsn);
892 continue;
893 }
894
895 cmd = ooo_cmdsn->cmd;
896 cmd->i_state = cmd->deferred_i_state;
897 ooo_count++;
898 sess->exp_cmd_sn++;
899 pr_debug("Executing out of order CmdSN: 0x%08x,"
900 " incremented ExpCmdSN to 0x%08x.\n",
901 cmd->cmd_sn, sess->exp_cmd_sn);
902
903 iscsit_remove_ooo_cmdsn(sess, ooo_cmdsn);
904
905 if (iscsit_execute_cmd(cmd, 1) < 0)
906 return -1;
907
908 continue;
909 }
910
911 return ooo_count;
912 }
913
914 /*
915 * Called either:
916 *
917 * 1. With sess->cmdsn_mutex held from iscsi_execute_ooo_cmdsns()
918 * or iscsi_check_received_cmdsn().
919 * 2. With no locks held directly from iscsi_handle_XXX_pdu() functions
920 * for immediate commands.
921 */
922 int iscsit_execute_cmd(struct iscsi_cmd *cmd, int ooo)
923 {
924 struct se_cmd *se_cmd = &cmd->se_cmd;
925 struct iscsi_conn *conn = cmd->conn;
926 int lr = 0;
927
928 spin_lock_bh(&cmd->istate_lock);
929 if (ooo)
930 cmd->cmd_flags &= ~ICF_OOO_CMDSN;
931
932 switch (cmd->iscsi_opcode) {
933 case ISCSI_OP_SCSI_CMD:
934 /*
935 * Go ahead and send the CHECK_CONDITION status for
936 * any SCSI CDB exceptions that may have occurred.
937 */
938 if (cmd->sense_reason) {
939 if (cmd->sense_reason == TCM_RESERVATION_CONFLICT) {
940 cmd->i_state = ISTATE_SEND_STATUS;
941 spin_unlock_bh(&cmd->istate_lock);
942 iscsit_add_cmd_to_response_queue(cmd, cmd->conn,
943 cmd->i_state);
944 return 0;
945 }
946 spin_unlock_bh(&cmd->istate_lock);
947 /*
948 * Determine if delayed TASK_ABORTED status for WRITEs
949 * should be sent now if no unsolicited data out
950 * payloads are expected, or if the delayed status
951 * should be sent after unsolicited data out with
952 * ISCSI_FLAG_CMD_FINAL set in iscsi_handle_data_out()
953 */
954 if (transport_check_aborted_status(se_cmd,
955 (cmd->unsolicited_data == 0)) != 0)
956 return 0;
957 /*
958 * Otherwise send CHECK_CONDITION and sense for
959 * exception
960 */
961 return transport_send_check_condition_and_sense(se_cmd,
962 cmd->sense_reason, 0);
963 }
964 /*
965 * Special case for delayed CmdSN with Immediate
966 * Data and/or Unsolicited Data Out attached.
967 */
968 if (cmd->immediate_data) {
969 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
970 spin_unlock_bh(&cmd->istate_lock);
971 target_execute_cmd(&cmd->se_cmd);
972 return 0;
973 }
974 spin_unlock_bh(&cmd->istate_lock);
975
976 if (!(cmd->cmd_flags &
977 ICF_NON_IMMEDIATE_UNSOLICITED_DATA)) {
978 /*
979 * Send the delayed TASK_ABORTED status for
980 * WRITEs if no more unsolicitied data is
981 * expected.
982 */
983 if (transport_check_aborted_status(se_cmd, 1)
984 != 0)
985 return 0;
986
987 iscsit_set_dataout_sequence_values(cmd);
988 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
989 }
990 return 0;
991 }
992 /*
993 * The default handler.
994 */
995 spin_unlock_bh(&cmd->istate_lock);
996
997 if ((cmd->data_direction == DMA_TO_DEVICE) &&
998 !(cmd->cmd_flags & ICF_NON_IMMEDIATE_UNSOLICITED_DATA)) {
999 /*
1000 * Send the delayed TASK_ABORTED status for WRITEs if
1001 * no more nsolicitied data is expected.
1002 */
1003 if (transport_check_aborted_status(se_cmd, 1) != 0)
1004 return 0;
1005
1006 iscsit_set_unsoliticed_dataout(cmd);
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 (cmd->se_cmd.se_tmr_req->response) {
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 -ENOMEM;
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 -ENOMEM;
1103 }
1104
1105 return 0;
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 }
1294 EXPORT_SYMBOL(iscsit_stop_dataout_timer);
Linux with added FPC-III support