iscsi_target_erl1.c revision 752d86805b18e58c56c6f3c7004c2dffd4430c17 
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 */
45int 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
112out:
113	kfree(buf);
114	return ret;
115}
116
117/*
118 *	Used for retransmitting R2Ts from a R2T SNACK request.
119 */
120static 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
142static 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 */
201int 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 */
247int 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
398done:
399	dr->read_data_done = read_data_done;
400	dr->seq_send_order = seq_send_order;
401
402	return 0;
403}
404
405static 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
466int 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!!! */
499int 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
563int 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
599static 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
613int 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
689static 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
766int 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
786static 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 */
804static 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 */
852void 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
860void 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 */
878int 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 */
922int 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
1054void 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
1068int 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
1108static 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 */
1151static 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
1226failure:
1227	spin_unlock_bh(&cmd->dataout_timeout_lock);
1228	iscsit_cause_connection_reinstatement(conn, 0);
1229	iscsit_dec_conn_usage_count(conn);
1230}
1231
1232void 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 */
1254void 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
1276void 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}
1294EXPORT_SYMBOL(iscsit_stop_dataout_timer);
1295