?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
x86/xen: resume timer irqs early
[linux/fpc-iii.git] / drivers / target / iscsi / iscsi_target_erl1.c
blobe048d6439f4a67bac09c27010bc07953ddac78d4
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 (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 (iscsi_sna_lt(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 (iscsi_sna_lt(ooo_tmp->cmdsn, ooo_cmdsn->cmdsn))
833 continue;
834
835 /* Insert before this entry */
836 list_add(&ooo_cmdsn->ooo_list,
837 ooo_tmp->ooo_list.prev);
838 break;
839 }
840 }
841 }
842
843 return 0;
844 }
845
846 /*
847 * Removes an struct iscsi_ooo_cmdsn from a session's list,
848 * called with struct iscsi_session->cmdsn_mutex held.
849 */
850 void iscsit_remove_ooo_cmdsn(
851 struct iscsi_session *sess,
852 struct iscsi_ooo_cmdsn *ooo_cmdsn)
853 {
854 list_del(&ooo_cmdsn->ooo_list);
855 kmem_cache_free(lio_ooo_cache, ooo_cmdsn);
856 }
857
858 void iscsit_clear_ooo_cmdsns_for_conn(struct iscsi_conn *conn)
859 {
860 struct iscsi_ooo_cmdsn *ooo_cmdsn;
861 struct iscsi_session *sess = conn->sess;
862
863 mutex_lock(&sess->cmdsn_mutex);
864 list_for_each_entry(ooo_cmdsn, &sess->sess_ooo_cmdsn_list, ooo_list) {
865 if (ooo_cmdsn->cid != conn->cid)
866 continue;
867
868 ooo_cmdsn->cmd = NULL;
869 }
870 mutex_unlock(&sess->cmdsn_mutex);
871 }
872
873 /*
874 * Called with sess->cmdsn_mutex held.
875 */
876 int iscsit_execute_ooo_cmdsns(struct iscsi_session *sess)
877 {
878 int ooo_count = 0;
879 struct iscsi_cmd *cmd = NULL;
880 struct iscsi_ooo_cmdsn *ooo_cmdsn, *ooo_cmdsn_tmp;
881
882 list_for_each_entry_safe(ooo_cmdsn, ooo_cmdsn_tmp,
883 &sess->sess_ooo_cmdsn_list, ooo_list) {
884 if (ooo_cmdsn->cmdsn != sess->exp_cmd_sn)
885 continue;
886
887 if (!ooo_cmdsn->cmd) {
888 sess->exp_cmd_sn++;
889 iscsit_remove_ooo_cmdsn(sess, ooo_cmdsn);
890 continue;
891 }
892
893 cmd = ooo_cmdsn->cmd;
894 cmd->i_state = cmd->deferred_i_state;
895 ooo_count++;
896 sess->exp_cmd_sn++;
897 pr_debug("Executing out of order CmdSN: 0x%08x,"
898 " incremented ExpCmdSN to 0x%08x.\n",
899 cmd->cmd_sn, sess->exp_cmd_sn);
900
901 iscsit_remove_ooo_cmdsn(sess, ooo_cmdsn);
902
903 if (iscsit_execute_cmd(cmd, 1) < 0)
904 return -1;
905
906 continue;
907 }
908
909 return ooo_count;
910 }
911
912 /*
913 * Called either:
914 *
915 * 1. With sess->cmdsn_mutex held from iscsi_execute_ooo_cmdsns()
916 * or iscsi_check_received_cmdsn().
917 * 2. With no locks held directly from iscsi_handle_XXX_pdu() functions
918 * for immediate commands.
919 */
920 int iscsit_execute_cmd(struct iscsi_cmd *cmd, int ooo)
921 {
922 struct se_cmd *se_cmd = &cmd->se_cmd;
923 struct iscsi_conn *conn = cmd->conn;
924 int lr = 0;
925
926 spin_lock_bh(&cmd->istate_lock);
927 if (ooo)
928 cmd->cmd_flags &= ~ICF_OOO_CMDSN;
929
930 switch (cmd->iscsi_opcode) {
931 case ISCSI_OP_SCSI_CMD:
932 /*
933 * Go ahead and send the CHECK_CONDITION status for
934 * any SCSI CDB exceptions that may have occurred.
935 */
936 if (cmd->sense_reason) {
937 if (cmd->sense_reason == TCM_RESERVATION_CONFLICT) {
938 cmd->i_state = ISTATE_SEND_STATUS;
939 spin_unlock_bh(&cmd->istate_lock);
940 iscsit_add_cmd_to_response_queue(cmd, cmd->conn,
941 cmd->i_state);
942 return 0;
943 }
944 spin_unlock_bh(&cmd->istate_lock);
945 /*
946 * Determine if delayed TASK_ABORTED status for WRITEs
947 * should be sent now if no unsolicited data out
948 * payloads are expected, or if the delayed status
949 * should be sent after unsolicited data out with
950 * ISCSI_FLAG_CMD_FINAL set in iscsi_handle_data_out()
951 */
952 if (transport_check_aborted_status(se_cmd,
953 (cmd->unsolicited_data == 0)) != 0)
954 return 0;
955 /*
956 * Otherwise send CHECK_CONDITION and sense for
957 * exception
958 */
959 return transport_send_check_condition_and_sense(se_cmd,
960 cmd->sense_reason, 0);
961 }
962 /*
963 * Special case for delayed CmdSN with Immediate
964 * Data and/or Unsolicited Data Out attached.
965 */
966 if (cmd->immediate_data) {
967 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
968 spin_unlock_bh(&cmd->istate_lock);
969 target_execute_cmd(&cmd->se_cmd);
970 return 0;
971 }
972 spin_unlock_bh(&cmd->istate_lock);
973
974 if (!(cmd->cmd_flags &
975 ICF_NON_IMMEDIATE_UNSOLICITED_DATA)) {
976 /*
977 * Send the delayed TASK_ABORTED status for
978 * WRITEs if no more unsolicitied data is
979 * expected.
980 */
981 if (transport_check_aborted_status(se_cmd, 1)
982 != 0)
983 return 0;
984
985 iscsit_set_dataout_sequence_values(cmd);
986 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
987 }
988 return 0;
989 }
990 /*
991 * The default handler.
992 */
993 spin_unlock_bh(&cmd->istate_lock);
994
995 if ((cmd->data_direction == DMA_TO_DEVICE) &&
996 !(cmd->cmd_flags & ICF_NON_IMMEDIATE_UNSOLICITED_DATA)) {
997 /*
998 * Send the delayed TASK_ABORTED status for WRITEs if
999 * no more nsolicitied data is expected.
1000 */
1001 if (transport_check_aborted_status(se_cmd, 1) != 0)
1002 return 0;
1003
1004 iscsit_set_unsoliticed_dataout(cmd);
1005 }
1006 return transport_handle_cdb_direct(&cmd->se_cmd);
1007
1008 case ISCSI_OP_NOOP_OUT:
1009 case ISCSI_OP_TEXT:
1010 spin_unlock_bh(&cmd->istate_lock);
1011 iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
1012 break;
1013 case ISCSI_OP_SCSI_TMFUNC:
1014 if (cmd->se_cmd.se_tmr_req->response) {
1015 spin_unlock_bh(&cmd->istate_lock);
1016 iscsit_add_cmd_to_response_queue(cmd, cmd->conn,
1017 cmd->i_state);
1018 return 0;
1019 }
1020 spin_unlock_bh(&cmd->istate_lock);
1021
1022 return transport_generic_handle_tmr(&cmd->se_cmd);
1023 case ISCSI_OP_LOGOUT:
1024 spin_unlock_bh(&cmd->istate_lock);
1025 switch (cmd->logout_reason) {
1026 case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
1027 lr = iscsit_logout_closesession(cmd, cmd->conn);
1028 break;
1029 case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
1030 lr = iscsit_logout_closeconnection(cmd, cmd->conn);
1031 break;
1032 case ISCSI_LOGOUT_REASON_RECOVERY:
1033 lr = iscsit_logout_removeconnforrecovery(cmd, cmd->conn);
1034 break;
1035 default:
1036 pr_err("Unknown iSCSI Logout Request Code:"
1037 " 0x%02x\n", cmd->logout_reason);
1038 return -1;
1039 }
1040
1041 return lr;
1042 default:
1043 spin_unlock_bh(&cmd->istate_lock);
1044 pr_err("Cannot perform out of order execution for"
1045 " unknown iSCSI Opcode: 0x%02x\n", cmd->iscsi_opcode);
1046 return -1;
1047 }
1048
1049 return 0;
1050 }
1051
1052 void iscsit_free_all_ooo_cmdsns(struct iscsi_session *sess)
1053 {
1054 struct iscsi_ooo_cmdsn *ooo_cmdsn, *ooo_cmdsn_tmp;
1055
1056 mutex_lock(&sess->cmdsn_mutex);
1057 list_for_each_entry_safe(ooo_cmdsn, ooo_cmdsn_tmp,
1058 &sess->sess_ooo_cmdsn_list, ooo_list) {
1059
1060 list_del(&ooo_cmdsn->ooo_list);
1061 kmem_cache_free(lio_ooo_cache, ooo_cmdsn);
1062 }
1063 mutex_unlock(&sess->cmdsn_mutex);
1064 }
1065
1066 int iscsit_handle_ooo_cmdsn(
1067 struct iscsi_session *sess,
1068 struct iscsi_cmd *cmd,
1069 u32 cmdsn)
1070 {
1071 int batch = 0;
1072 struct iscsi_ooo_cmdsn *ooo_cmdsn = NULL, *ooo_tail = NULL;
1073
1074 cmd->deferred_i_state = cmd->i_state;
1075 cmd->i_state = ISTATE_DEFERRED_CMD;
1076 cmd->cmd_flags |= ICF_OOO_CMDSN;
1077
1078 if (list_empty(&sess->sess_ooo_cmdsn_list))
1079 batch = 1;
1080 else {
1081 ooo_tail = list_entry(sess->sess_ooo_cmdsn_list.prev,
1082 typeof(*ooo_tail), ooo_list);
1083 if (ooo_tail->cmdsn != (cmdsn - 1))
1084 batch = 1;
1085 }
1086
1087 ooo_cmdsn = iscsit_allocate_ooo_cmdsn();
1088 if (!ooo_cmdsn)
1089 return -ENOMEM;
1090
1091 ooo_cmdsn->cmd = cmd;
1092 ooo_cmdsn->batch_count = (batch) ?
1093 (cmdsn - sess->exp_cmd_sn) : 1;
1094 ooo_cmdsn->cid = cmd->conn->cid;
1095 ooo_cmdsn->exp_cmdsn = sess->exp_cmd_sn;
1096 ooo_cmdsn->cmdsn = cmdsn;
1097
1098 if (iscsit_attach_ooo_cmdsn(sess, ooo_cmdsn) < 0) {
1099 kmem_cache_free(lio_ooo_cache, ooo_cmdsn);
1100 return -ENOMEM;
1101 }
1102
1103 return 0;
1104 }
1105
1106 static int iscsit_set_dataout_timeout_values(
1107 struct iscsi_cmd *cmd,
1108 u32 *offset,
1109 u32 *length)
1110 {
1111 struct iscsi_conn *conn = cmd->conn;
1112 struct iscsi_r2t *r2t;
1113
1114 if (cmd->unsolicited_data) {
1115 *offset = 0;
1116 *length = (conn->sess->sess_ops->FirstBurstLength >
1117 cmd->se_cmd.data_length) ?
1118 cmd->se_cmd.data_length :
1119 conn->sess->sess_ops->FirstBurstLength;
1120 return 0;
1121 }
1122
1123 spin_lock_bh(&cmd->r2t_lock);
1124 if (list_empty(&cmd->cmd_r2t_list)) {
1125 pr_err("cmd->cmd_r2t_list is empty!\n");
1126 spin_unlock_bh(&cmd->r2t_lock);
1127 return -1;
1128 }
1129
1130 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
1131 if (r2t->sent_r2t && !r2t->recovery_r2t && !r2t->seq_complete) {
1132 *offset = r2t->offset;
1133 *length = r2t->xfer_len;
1134 spin_unlock_bh(&cmd->r2t_lock);
1135 return 0;
1136 }
1137 }
1138 spin_unlock_bh(&cmd->r2t_lock);
1139
1140 pr_err("Unable to locate any incomplete DataOUT"
1141 " sequences for ITT: 0x%08x.\n", cmd->init_task_tag);
1142
1143 return -1;
1144 }
1145
1146 /*
1147 * NOTE: Called from interrupt (timer) context.
1148 */
1149 static void iscsit_handle_dataout_timeout(unsigned long data)
1150 {
1151 u32 pdu_length = 0, pdu_offset = 0;
1152 u32 r2t_length = 0, r2t_offset = 0;
1153 struct iscsi_cmd *cmd = (struct iscsi_cmd *) data;
1154 struct iscsi_conn *conn = cmd->conn;
1155 struct iscsi_session *sess = NULL;
1156 struct iscsi_node_attrib *na;
1157
1158 iscsit_inc_conn_usage_count(conn);
1159
1160 spin_lock_bh(&cmd->dataout_timeout_lock);
1161 if (cmd->dataout_timer_flags & ISCSI_TF_STOP) {
1162 spin_unlock_bh(&cmd->dataout_timeout_lock);
1163 iscsit_dec_conn_usage_count(conn);
1164 return;
1165 }
1166 cmd->dataout_timer_flags &= ~ISCSI_TF_RUNNING;
1167 sess = conn->sess;
1168 na = iscsit_tpg_get_node_attrib(sess);
1169
1170 if (!sess->sess_ops->ErrorRecoveryLevel) {
1171 pr_debug("Unable to recover from DataOut timeout while"
1172 " in ERL=0.\n");
1173 goto failure;
1174 }
1175
1176 if (++cmd->dataout_timeout_retries == na->dataout_timeout_retries) {
1177 pr_debug("Command ITT: 0x%08x exceeded max retries"
1178 " for DataOUT timeout %u, closing iSCSI connection.\n",
1179 cmd->init_task_tag, na->dataout_timeout_retries);
1180 goto failure;
1181 }
1182
1183 cmd->cmd_flags |= ICF_WITHIN_COMMAND_RECOVERY;
1184
1185 if (conn->sess->sess_ops->DataSequenceInOrder) {
1186 if (conn->sess->sess_ops->DataPDUInOrder) {
1187 pdu_offset = cmd->write_data_done;
1188 if ((pdu_offset + (conn->sess->sess_ops->MaxBurstLength -
1189 cmd->next_burst_len)) > cmd->se_cmd.data_length)
1190 pdu_length = (cmd->se_cmd.data_length -
1191 cmd->write_data_done);
1192 else
1193 pdu_length = (conn->sess->sess_ops->MaxBurstLength -
1194 cmd->next_burst_len);
1195 } else {
1196 pdu_offset = cmd->seq_start_offset;
1197 pdu_length = (cmd->seq_end_offset -
1198 cmd->seq_start_offset);
1199 }
1200 } else {
1201 if (iscsit_set_dataout_timeout_values(cmd, &pdu_offset,
1202 &pdu_length) < 0)
1203 goto failure;
1204 }
1205
1206 if (iscsit_recalculate_dataout_values(cmd, pdu_offset, pdu_length,
1207 &r2t_offset, &r2t_length) < 0)
1208 goto failure;
1209
1210 pr_debug("Command ITT: 0x%08x timed out waiting for"
1211 " completion of %sDataOUT Sequence Offset: %u, Length: %u\n",
1212 cmd->init_task_tag, (cmd->unsolicited_data) ? "Unsolicited " :
1213 "", r2t_offset, r2t_length);
1214
1215 if (iscsit_send_recovery_r2t(cmd, r2t_offset, r2t_length) < 0)
1216 goto failure;
1217
1218 iscsit_start_dataout_timer(cmd, conn);
1219 spin_unlock_bh(&cmd->dataout_timeout_lock);
1220 iscsit_dec_conn_usage_count(conn);
1221
1222 return;
1223
1224 failure:
1225 spin_unlock_bh(&cmd->dataout_timeout_lock);
1226 iscsit_cause_connection_reinstatement(conn, 0);
1227 iscsit_dec_conn_usage_count(conn);
1228 }
1229
1230 void iscsit_mod_dataout_timer(struct iscsi_cmd *cmd)
1231 {
1232 struct iscsi_conn *conn = cmd->conn;
1233 struct iscsi_session *sess = conn->sess;
1234 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1235
1236 spin_lock_bh(&cmd->dataout_timeout_lock);
1237 if (!(cmd->dataout_timer_flags & ISCSI_TF_RUNNING)) {
1238 spin_unlock_bh(&cmd->dataout_timeout_lock);
1239 return;
1240 }
1241
1242 mod_timer(&cmd->dataout_timer,
1243 (get_jiffies_64() + na->dataout_timeout * HZ));
1244 pr_debug("Updated DataOUT timer for ITT: 0x%08x",
1245 cmd->init_task_tag);
1246 spin_unlock_bh(&cmd->dataout_timeout_lock);
1247 }
1248
1249 /*
1250 * Called with cmd->dataout_timeout_lock held.
1251 */
1252 void iscsit_start_dataout_timer(
1253 struct iscsi_cmd *cmd,
1254 struct iscsi_conn *conn)
1255 {
1256 struct iscsi_session *sess = conn->sess;
1257 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1258
1259 if (cmd->dataout_timer_flags & ISCSI_TF_RUNNING)
1260 return;
1261
1262 pr_debug("Starting DataOUT timer for ITT: 0x%08x on"
1263 " CID: %hu.\n", cmd->init_task_tag, conn->cid);
1264
1265 init_timer(&cmd->dataout_timer);
1266 cmd->dataout_timer.expires = (get_jiffies_64() + na->dataout_timeout * HZ);
1267 cmd->dataout_timer.data = (unsigned long)cmd;
1268 cmd->dataout_timer.function = iscsit_handle_dataout_timeout;
1269 cmd->dataout_timer_flags &= ~ISCSI_TF_STOP;
1270 cmd->dataout_timer_flags |= ISCSI_TF_RUNNING;
1271 add_timer(&cmd->dataout_timer);
1272 }
1273
1274 void iscsit_stop_dataout_timer(struct iscsi_cmd *cmd)
1275 {
1276 spin_lock_bh(&cmd->dataout_timeout_lock);
1277 if (!(cmd->dataout_timer_flags & ISCSI_TF_RUNNING)) {
1278 spin_unlock_bh(&cmd->dataout_timeout_lock);
1279 return;
1280 }
1281 cmd->dataout_timer_flags |= ISCSI_TF_STOP;
1282 spin_unlock_bh(&cmd->dataout_timeout_lock);
1283
1284 del_timer_sync(&cmd->dataout_timer);
1285
1286 spin_lock_bh(&cmd->dataout_timeout_lock);
1287 cmd->dataout_timer_flags &= ~ISCSI_TF_RUNNING;
1288 pr_debug("Stopped DataOUT Timer for ITT: 0x%08x\n",
1289 cmd->init_task_tag);
1290 spin_unlock_bh(&cmd->dataout_timeout_lock);
1291 }
1292 EXPORT_SYMBOL(iscsit_stop_dataout_timer);
Linux with added FPC-III support