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Btrfs: stop the readahead threads on failed mount
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / target / iscsi / iscsi_target_erl0.c
blobb7ffc3cd40cca0141ac02441894a1bd018fc2f0e
1 /******************************************************************************
2 * This file contains error recovery level zero functions used by
3 * the iSCSI Target driver.
4 *
5 * \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
6 *
7 * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
8 *
9 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 ******************************************************************************/
21
22 #include <scsi/iscsi_proto.h>
23 #include <target/target_core_base.h>
24 #include <target/target_core_transport.h>
25
26 #include "iscsi_target_core.h"
27 #include "iscsi_target_seq_pdu_list.h"
28 #include "iscsi_target_tq.h"
29 #include "iscsi_target_erl0.h"
30 #include "iscsi_target_erl1.h"
31 #include "iscsi_target_erl2.h"
32 #include "iscsi_target_util.h"
33 #include "iscsi_target.h"
34
35 /*
36 * Used to set values in struct iscsi_cmd that iscsit_dataout_check_sequence()
37 * checks against to determine a PDU's Offset+Length is within the current
38 * DataOUT Sequence. Used for DataSequenceInOrder=Yes only.
39 */
40 void iscsit_set_dataout_sequence_values(
41 struct iscsi_cmd *cmd)
42 {
43 struct iscsi_conn *conn = cmd->conn;
44 /*
45 * Still set seq_start_offset and seq_end_offset for Unsolicited
46 * DataOUT, even if DataSequenceInOrder=No.
47 */
48 if (cmd->unsolicited_data) {
49 cmd->seq_start_offset = cmd->write_data_done;
50 cmd->seq_end_offset = (cmd->write_data_done +
51 (cmd->data_length >
52 conn->sess->sess_ops->FirstBurstLength) ?
53 conn->sess->sess_ops->FirstBurstLength : cmd->data_length);
54 return;
55 }
56
57 if (!conn->sess->sess_ops->DataSequenceInOrder)
58 return;
59
60 if (!cmd->seq_start_offset && !cmd->seq_end_offset) {
61 cmd->seq_start_offset = cmd->write_data_done;
62 cmd->seq_end_offset = (cmd->data_length >
63 conn->sess->sess_ops->MaxBurstLength) ?
64 (cmd->write_data_done +
65 conn->sess->sess_ops->MaxBurstLength) : cmd->data_length;
66 } else {
67 cmd->seq_start_offset = cmd->seq_end_offset;
68 cmd->seq_end_offset = ((cmd->seq_end_offset +
69 conn->sess->sess_ops->MaxBurstLength) >=
70 cmd->data_length) ? cmd->data_length :
71 (cmd->seq_end_offset +
72 conn->sess->sess_ops->MaxBurstLength);
73 }
74 }
75
76 static int iscsit_dataout_within_command_recovery_check(
77 struct iscsi_cmd *cmd,
78 unsigned char *buf)
79 {
80 struct iscsi_conn *conn = cmd->conn;
81 struct iscsi_data *hdr = (struct iscsi_data *) buf;
82 u32 payload_length = ntoh24(hdr->dlength);
83
84 /*
85 * We do the within-command recovery checks here as it is
86 * the first function called in iscsi_check_pre_dataout().
87 * Basically, if we are in within-command recovery and
88 * the PDU does not contain the offset the sequence needs,
89 * dump the payload.
90 *
91 * This only applies to DataPDUInOrder=Yes, for
92 * DataPDUInOrder=No we only re-request the failed PDU
93 * and check that all PDUs in a sequence are received
94 * upon end of sequence.
95 */
96 if (conn->sess->sess_ops->DataSequenceInOrder) {
97 if ((cmd->cmd_flags & ICF_WITHIN_COMMAND_RECOVERY) &&
98 (cmd->write_data_done != hdr->offset))
99 goto dump;
100
101 cmd->cmd_flags &= ~ICF_WITHIN_COMMAND_RECOVERY;
102 } else {
103 struct iscsi_seq *seq;
104
105 seq = iscsit_get_seq_holder(cmd, hdr->offset, payload_length);
106 if (!seq)
107 return DATAOUT_CANNOT_RECOVER;
108 /*
109 * Set the struct iscsi_seq pointer to reuse later.
110 */
111 cmd->seq_ptr = seq;
112
113 if (conn->sess->sess_ops->DataPDUInOrder) {
114 if ((seq->status ==
115 DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY) &&
116 ((seq->offset != hdr->offset) ||
117 (seq->data_sn != hdr->datasn)))
118 goto dump;
119 } else {
120 if ((seq->status ==
121 DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY) &&
122 (seq->data_sn != hdr->datasn))
123 goto dump;
124 }
125
126 if (seq->status == DATAOUT_SEQUENCE_COMPLETE)
127 goto dump;
128
129 if (seq->status != DATAOUT_SEQUENCE_COMPLETE)
130 seq->status = 0;
131 }
132
133 return DATAOUT_NORMAL;
134
135 dump:
136 pr_err("Dumping DataOUT PDU Offset: %u Length: %d DataSN:"
137 " 0x%08x\n", hdr->offset, payload_length, hdr->datasn);
138 return iscsit_dump_data_payload(conn, payload_length, 1);
139 }
140
141 static int iscsit_dataout_check_unsolicited_sequence(
142 struct iscsi_cmd *cmd,
143 unsigned char *buf)
144 {
145 u32 first_burst_len;
146 struct iscsi_conn *conn = cmd->conn;
147 struct iscsi_data *hdr = (struct iscsi_data *) buf;
148 u32 payload_length = ntoh24(hdr->dlength);
149
150
151 if ((hdr->offset < cmd->seq_start_offset) ||
152 ((hdr->offset + payload_length) > cmd->seq_end_offset)) {
153 pr_err("Command ITT: 0x%08x with Offset: %u,"
154 " Length: %u outside of Unsolicited Sequence %u:%u while"
155 " DataSequenceInOrder=Yes.\n", cmd->init_task_tag,
156 hdr->offset, payload_length, cmd->seq_start_offset,
157 cmd->seq_end_offset);
158 return DATAOUT_CANNOT_RECOVER;
159 }
160
161 first_burst_len = (cmd->first_burst_len + payload_length);
162
163 if (first_burst_len > conn->sess->sess_ops->FirstBurstLength) {
164 pr_err("Total %u bytes exceeds FirstBurstLength: %u"
165 " for this Unsolicited DataOut Burst.\n",
166 first_burst_len, conn->sess->sess_ops->FirstBurstLength);
167 transport_send_check_condition_and_sense(&cmd->se_cmd,
168 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
169 return DATAOUT_CANNOT_RECOVER;
170 }
171
172 /*
173 * Perform various MaxBurstLength and ISCSI_FLAG_CMD_FINAL sanity
174 * checks for the current Unsolicited DataOUT Sequence.
175 */
176 if (hdr->flags & ISCSI_FLAG_CMD_FINAL) {
177 /*
178 * Ignore ISCSI_FLAG_CMD_FINAL checks while DataPDUInOrder=No, end of
179 * sequence checks are handled in
180 * iscsit_dataout_datapduinorder_no_fbit().
181 */
182 if (!conn->sess->sess_ops->DataPDUInOrder)
183 goto out;
184
185 if ((first_burst_len != cmd->data_length) &&
186 (first_burst_len != conn->sess->sess_ops->FirstBurstLength)) {
187 pr_err("Unsolicited non-immediate data"
188 " received %u does not equal FirstBurstLength: %u, and"
189 " does not equal ExpXferLen %u.\n", first_burst_len,
190 conn->sess->sess_ops->FirstBurstLength,
191 cmd->data_length);
192 transport_send_check_condition_and_sense(&cmd->se_cmd,
193 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
194 return DATAOUT_CANNOT_RECOVER;
195 }
196 } else {
197 if (first_burst_len == conn->sess->sess_ops->FirstBurstLength) {
198 pr_err("Command ITT: 0x%08x reached"
199 " FirstBurstLength: %u, but ISCSI_FLAG_CMD_FINAL is not set. protocol"
200 " error.\n", cmd->init_task_tag,
201 conn->sess->sess_ops->FirstBurstLength);
202 return DATAOUT_CANNOT_RECOVER;
203 }
204 if (first_burst_len == cmd->data_length) {
205 pr_err("Command ITT: 0x%08x reached"
206 " ExpXferLen: %u, but ISCSI_FLAG_CMD_FINAL is not set. protocol"
207 " error.\n", cmd->init_task_tag, cmd->data_length);
208 return DATAOUT_CANNOT_RECOVER;
209 }
210 }
211
212 out:
213 return DATAOUT_NORMAL;
214 }
215
216 static int iscsit_dataout_check_sequence(
217 struct iscsi_cmd *cmd,
218 unsigned char *buf)
219 {
220 u32 next_burst_len;
221 struct iscsi_conn *conn = cmd->conn;
222 struct iscsi_seq *seq = NULL;
223 struct iscsi_data *hdr = (struct iscsi_data *) buf;
224 u32 payload_length = ntoh24(hdr->dlength);
225
226 /*
227 * For DataSequenceInOrder=Yes: Check that the offset and offset+length
228 * is within range as defined by iscsi_set_dataout_sequence_values().
229 *
230 * For DataSequenceInOrder=No: Check that an struct iscsi_seq exists for
231 * offset+length tuple.
232 */
233 if (conn->sess->sess_ops->DataSequenceInOrder) {
234 /*
235 * Due to possibility of recovery DataOUT sent by the initiator
236 * fullfilling an Recovery R2T, it's best to just dump the
237 * payload here, instead of erroring out.
238 */
239 if ((hdr->offset < cmd->seq_start_offset) ||
240 ((hdr->offset + payload_length) > cmd->seq_end_offset)) {
241 pr_err("Command ITT: 0x%08x with Offset: %u,"
242 " Length: %u outside of Sequence %u:%u while"
243 " DataSequenceInOrder=Yes.\n", cmd->init_task_tag,
244 hdr->offset, payload_length, cmd->seq_start_offset,
245 cmd->seq_end_offset);
246
247 if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
248 return DATAOUT_CANNOT_RECOVER;
249 return DATAOUT_WITHIN_COMMAND_RECOVERY;
250 }
251
252 next_burst_len = (cmd->next_burst_len + payload_length);
253 } else {
254 seq = iscsit_get_seq_holder(cmd, hdr->offset, payload_length);
255 if (!seq)
256 return DATAOUT_CANNOT_RECOVER;
257 /*
258 * Set the struct iscsi_seq pointer to reuse later.
259 */
260 cmd->seq_ptr = seq;
261
262 if (seq->status == DATAOUT_SEQUENCE_COMPLETE) {
263 if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
264 return DATAOUT_CANNOT_RECOVER;
265 return DATAOUT_WITHIN_COMMAND_RECOVERY;
266 }
267
268 next_burst_len = (seq->next_burst_len + payload_length);
269 }
270
271 if (next_burst_len > conn->sess->sess_ops->MaxBurstLength) {
272 pr_err("Command ITT: 0x%08x, NextBurstLength: %u and"
273 " Length: %u exceeds MaxBurstLength: %u. protocol"
274 " error.\n", cmd->init_task_tag,
275 (next_burst_len - payload_length),
276 payload_length, conn->sess->sess_ops->MaxBurstLength);
277 return DATAOUT_CANNOT_RECOVER;
278 }
279
280 /*
281 * Perform various MaxBurstLength and ISCSI_FLAG_CMD_FINAL sanity
282 * checks for the current DataOUT Sequence.
283 */
284 if (hdr->flags & ISCSI_FLAG_CMD_FINAL) {
285 /*
286 * Ignore ISCSI_FLAG_CMD_FINAL checks while DataPDUInOrder=No, end of
287 * sequence checks are handled in
288 * iscsit_dataout_datapduinorder_no_fbit().
289 */
290 if (!conn->sess->sess_ops->DataPDUInOrder)
291 goto out;
292
293 if (conn->sess->sess_ops->DataSequenceInOrder) {
294 if ((next_burst_len <
295 conn->sess->sess_ops->MaxBurstLength) &&
296 ((cmd->write_data_done + payload_length) <
297 cmd->data_length)) {
298 pr_err("Command ITT: 0x%08x set ISCSI_FLAG_CMD_FINAL"
299 " before end of DataOUT sequence, protocol"
300 " error.\n", cmd->init_task_tag);
301 return DATAOUT_CANNOT_RECOVER;
302 }
303 } else {
304 if (next_burst_len < seq->xfer_len) {
305 pr_err("Command ITT: 0x%08x set ISCSI_FLAG_CMD_FINAL"
306 " before end of DataOUT sequence, protocol"
307 " error.\n", cmd->init_task_tag);
308 return DATAOUT_CANNOT_RECOVER;
309 }
310 }
311 } else {
312 if (conn->sess->sess_ops->DataSequenceInOrder) {
313 if (next_burst_len ==
314 conn->sess->sess_ops->MaxBurstLength) {
315 pr_err("Command ITT: 0x%08x reached"
316 " MaxBurstLength: %u, but ISCSI_FLAG_CMD_FINAL is"
317 " not set, protocol error.", cmd->init_task_tag,
318 conn->sess->sess_ops->MaxBurstLength);
319 return DATAOUT_CANNOT_RECOVER;
320 }
321 if ((cmd->write_data_done + payload_length) ==
322 cmd->data_length) {
323 pr_err("Command ITT: 0x%08x reached"
324 " last DataOUT PDU in sequence but ISCSI_FLAG_"
325 "CMD_FINAL is not set, protocol error.\n",
326 cmd->init_task_tag);
327 return DATAOUT_CANNOT_RECOVER;
328 }
329 } else {
330 if (next_burst_len == seq->xfer_len) {
331 pr_err("Command ITT: 0x%08x reached"
332 " last DataOUT PDU in sequence but ISCSI_FLAG_"
333 "CMD_FINAL is not set, protocol error.\n",
334 cmd->init_task_tag);
335 return DATAOUT_CANNOT_RECOVER;
336 }
337 }
338 }
339
340 out:
341 return DATAOUT_NORMAL;
342 }
343
344 static int iscsit_dataout_check_datasn(
345 struct iscsi_cmd *cmd,
346 unsigned char *buf)
347 {
348 int dump = 0, recovery = 0;
349 u32 data_sn = 0;
350 struct iscsi_conn *conn = cmd->conn;
351 struct iscsi_data *hdr = (struct iscsi_data *) buf;
352 u32 payload_length = ntoh24(hdr->dlength);
353
354 /*
355 * Considering the target has no method of re-requesting DataOUT
356 * by DataSN, if we receieve a greater DataSN than expected we
357 * assume the functions for DataPDUInOrder=[Yes,No] below will
358 * handle it.
359 *
360 * If the DataSN is less than expected, dump the payload.
361 */
362 if (conn->sess->sess_ops->DataSequenceInOrder)
363 data_sn = cmd->data_sn;
364 else {
365 struct iscsi_seq *seq = cmd->seq_ptr;
366 data_sn = seq->data_sn;
367 }
368
369 if (hdr->datasn > data_sn) {
370 pr_err("Command ITT: 0x%08x, received DataSN: 0x%08x"
371 " higher than expected 0x%08x.\n", cmd->init_task_tag,
372 hdr->datasn, data_sn);
373 recovery = 1;
374 goto recover;
375 } else if (hdr->datasn < data_sn) {
376 pr_err("Command ITT: 0x%08x, received DataSN: 0x%08x"
377 " lower than expected 0x%08x, discarding payload.\n",
378 cmd->init_task_tag, hdr->datasn, data_sn);
379 dump = 1;
380 goto dump;
381 }
382
383 return DATAOUT_NORMAL;
384
385 recover:
386 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
387 pr_err("Unable to perform within-command recovery"
388 " while ERL=0.\n");
389 return DATAOUT_CANNOT_RECOVER;
390 }
391 dump:
392 if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
393 return DATAOUT_CANNOT_RECOVER;
394
395 return (recovery || dump) ? DATAOUT_WITHIN_COMMAND_RECOVERY :
396 DATAOUT_NORMAL;
397 }
398
399 static int iscsit_dataout_pre_datapduinorder_yes(
400 struct iscsi_cmd *cmd,
401 unsigned char *buf)
402 {
403 int dump = 0, recovery = 0;
404 struct iscsi_conn *conn = cmd->conn;
405 struct iscsi_data *hdr = (struct iscsi_data *) buf;
406 u32 payload_length = ntoh24(hdr->dlength);
407
408 /*
409 * For DataSequenceInOrder=Yes: If the offset is greater than the global
410 * DataPDUInOrder=Yes offset counter in struct iscsi_cmd a protcol error has
411 * occured and fail the connection.
412 *
413 * For DataSequenceInOrder=No: If the offset is greater than the per
414 * sequence DataPDUInOrder=Yes offset counter in struct iscsi_seq a protocol
415 * error has occured and fail the connection.
416 */
417 if (conn->sess->sess_ops->DataSequenceInOrder) {
418 if (hdr->offset != cmd->write_data_done) {
419 pr_err("Command ITT: 0x%08x, received offset"
420 " %u different than expected %u.\n", cmd->init_task_tag,
421 hdr->offset, cmd->write_data_done);
422 recovery = 1;
423 goto recover;
424 }
425 } else {
426 struct iscsi_seq *seq = cmd->seq_ptr;
427
428 if (hdr->offset > seq->offset) {
429 pr_err("Command ITT: 0x%08x, received offset"
430 " %u greater than expected %u.\n", cmd->init_task_tag,
431 hdr->offset, seq->offset);
432 recovery = 1;
433 goto recover;
434 } else if (hdr->offset < seq->offset) {
435 pr_err("Command ITT: 0x%08x, received offset"
436 " %u less than expected %u, discarding payload.\n",
437 cmd->init_task_tag, hdr->offset, seq->offset);
438 dump = 1;
439 goto dump;
440 }
441 }
442
443 return DATAOUT_NORMAL;
444
445 recover:
446 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
447 pr_err("Unable to perform within-command recovery"
448 " while ERL=0.\n");
449 return DATAOUT_CANNOT_RECOVER;
450 }
451 dump:
452 if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
453 return DATAOUT_CANNOT_RECOVER;
454
455 return (recovery) ? iscsit_recover_dataout_sequence(cmd,
456 hdr->offset, payload_length) :
457 (dump) ? DATAOUT_WITHIN_COMMAND_RECOVERY : DATAOUT_NORMAL;
458 }
459
460 static int iscsit_dataout_pre_datapduinorder_no(
461 struct iscsi_cmd *cmd,
462 unsigned char *buf)
463 {
464 struct iscsi_pdu *pdu;
465 struct iscsi_data *hdr = (struct iscsi_data *) buf;
466 u32 payload_length = ntoh24(hdr->dlength);
467
468 pdu = iscsit_get_pdu_holder(cmd, hdr->offset, payload_length);
469 if (!pdu)
470 return DATAOUT_CANNOT_RECOVER;
471
472 cmd->pdu_ptr = pdu;
473
474 switch (pdu->status) {
475 case ISCSI_PDU_NOT_RECEIVED:
476 case ISCSI_PDU_CRC_FAILED:
477 case ISCSI_PDU_TIMED_OUT:
478 break;
479 case ISCSI_PDU_RECEIVED_OK:
480 pr_err("Command ITT: 0x%08x received already gotten"
481 " Offset: %u, Length: %u\n", cmd->init_task_tag,
482 hdr->offset, payload_length);
483 return iscsit_dump_data_payload(cmd->conn, payload_length, 1);
484 default:
485 return DATAOUT_CANNOT_RECOVER;
486 }
487
488 return DATAOUT_NORMAL;
489 }
490
491 static int iscsit_dataout_update_r2t(struct iscsi_cmd *cmd, u32 offset, u32 length)
492 {
493 struct iscsi_r2t *r2t;
494
495 if (cmd->unsolicited_data)
496 return 0;
497
498 r2t = iscsit_get_r2t_for_eos(cmd, offset, length);
499 if (!r2t)
500 return -1;
501
502 spin_lock_bh(&cmd->r2t_lock);
503 r2t->seq_complete = 1;
504 cmd->outstanding_r2ts--;
505 spin_unlock_bh(&cmd->r2t_lock);
506
507 return 0;
508 }
509
510 static int iscsit_dataout_update_datapduinorder_no(
511 struct iscsi_cmd *cmd,
512 u32 data_sn,
513 int f_bit)
514 {
515 int ret = 0;
516 struct iscsi_pdu *pdu = cmd->pdu_ptr;
517
518 pdu->data_sn = data_sn;
519
520 switch (pdu->status) {
521 case ISCSI_PDU_NOT_RECEIVED:
522 pdu->status = ISCSI_PDU_RECEIVED_OK;
523 break;
524 case ISCSI_PDU_CRC_FAILED:
525 pdu->status = ISCSI_PDU_RECEIVED_OK;
526 break;
527 case ISCSI_PDU_TIMED_OUT:
528 pdu->status = ISCSI_PDU_RECEIVED_OK;
529 break;
530 default:
531 return DATAOUT_CANNOT_RECOVER;
532 }
533
534 if (f_bit) {
535 ret = iscsit_dataout_datapduinorder_no_fbit(cmd, pdu);
536 if (ret == DATAOUT_CANNOT_RECOVER)
537 return ret;
538 }
539
540 return DATAOUT_NORMAL;
541 }
542
543 static int iscsit_dataout_post_crc_passed(
544 struct iscsi_cmd *cmd,
545 unsigned char *buf)
546 {
547 int ret, send_r2t = 0;
548 struct iscsi_conn *conn = cmd->conn;
549 struct iscsi_seq *seq = NULL;
550 struct iscsi_data *hdr = (struct iscsi_data *) buf;
551 u32 payload_length = ntoh24(hdr->dlength);
552
553 if (cmd->unsolicited_data) {
554 if ((cmd->first_burst_len + payload_length) ==
555 conn->sess->sess_ops->FirstBurstLength) {
556 if (iscsit_dataout_update_r2t(cmd, hdr->offset,
557 payload_length) < 0)
558 return DATAOUT_CANNOT_RECOVER;
559 send_r2t = 1;
560 }
561
562 if (!conn->sess->sess_ops->DataPDUInOrder) {
563 ret = iscsit_dataout_update_datapduinorder_no(cmd,
564 hdr->datasn, (hdr->flags & ISCSI_FLAG_CMD_FINAL));
565 if (ret == DATAOUT_CANNOT_RECOVER)
566 return ret;
567 }
568
569 cmd->first_burst_len += payload_length;
570
571 if (conn->sess->sess_ops->DataSequenceInOrder)
572 cmd->data_sn++;
573 else {
574 seq = cmd->seq_ptr;
575 seq->data_sn++;
576 seq->offset += payload_length;
577 }
578
579 if (send_r2t) {
580 if (seq)
581 seq->status = DATAOUT_SEQUENCE_COMPLETE;
582 cmd->first_burst_len = 0;
583 cmd->unsolicited_data = 0;
584 }
585 } else {
586 if (conn->sess->sess_ops->DataSequenceInOrder) {
587 if ((cmd->next_burst_len + payload_length) ==
588 conn->sess->sess_ops->MaxBurstLength) {
589 if (iscsit_dataout_update_r2t(cmd, hdr->offset,
590 payload_length) < 0)
591 return DATAOUT_CANNOT_RECOVER;
592 send_r2t = 1;
593 }
594
595 if (!conn->sess->sess_ops->DataPDUInOrder) {
596 ret = iscsit_dataout_update_datapduinorder_no(
597 cmd, hdr->datasn,
598 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
599 if (ret == DATAOUT_CANNOT_RECOVER)
600 return ret;
601 }
602
603 cmd->next_burst_len += payload_length;
604 cmd->data_sn++;
605
606 if (send_r2t)
607 cmd->next_burst_len = 0;
608 } else {
609 seq = cmd->seq_ptr;
610
611 if ((seq->next_burst_len + payload_length) ==
612 seq->xfer_len) {
613 if (iscsit_dataout_update_r2t(cmd, hdr->offset,
614 payload_length) < 0)
615 return DATAOUT_CANNOT_RECOVER;
616 send_r2t = 1;
617 }
618
619 if (!conn->sess->sess_ops->DataPDUInOrder) {
620 ret = iscsit_dataout_update_datapduinorder_no(
621 cmd, hdr->datasn,
622 (hdr->flags & ISCSI_FLAG_CMD_FINAL));
623 if (ret == DATAOUT_CANNOT_RECOVER)
624 return ret;
625 }
626
627 seq->data_sn++;
628 seq->offset += payload_length;
629 seq->next_burst_len += payload_length;
630
631 if (send_r2t) {
632 seq->next_burst_len = 0;
633 seq->status = DATAOUT_SEQUENCE_COMPLETE;
634 }
635 }
636 }
637
638 if (send_r2t && conn->sess->sess_ops->DataSequenceInOrder)
639 cmd->data_sn = 0;
640
641 cmd->write_data_done += payload_length;
642
643 return (cmd->write_data_done == cmd->data_length) ?
644 DATAOUT_SEND_TO_TRANSPORT : (send_r2t) ?
645 DATAOUT_SEND_R2T : DATAOUT_NORMAL;
646 }
647
648 static int iscsit_dataout_post_crc_failed(
649 struct iscsi_cmd *cmd,
650 unsigned char *buf)
651 {
652 struct iscsi_conn *conn = cmd->conn;
653 struct iscsi_pdu *pdu;
654 struct iscsi_data *hdr = (struct iscsi_data *) buf;
655 u32 payload_length = ntoh24(hdr->dlength);
656
657 if (conn->sess->sess_ops->DataPDUInOrder)
658 goto recover;
659 /*
660 * The rest of this function is only called when DataPDUInOrder=No.
661 */
662 pdu = cmd->pdu_ptr;
663
664 switch (pdu->status) {
665 case ISCSI_PDU_NOT_RECEIVED:
666 pdu->status = ISCSI_PDU_CRC_FAILED;
667 break;
668 case ISCSI_PDU_CRC_FAILED:
669 break;
670 case ISCSI_PDU_TIMED_OUT:
671 pdu->status = ISCSI_PDU_CRC_FAILED;
672 break;
673 default:
674 return DATAOUT_CANNOT_RECOVER;
675 }
676
677 recover:
678 return iscsit_recover_dataout_sequence(cmd, hdr->offset, payload_length);
679 }
680
681 /*
682 * Called from iscsit_handle_data_out() before DataOUT Payload is received
683 * and CRC computed.
684 */
685 extern int iscsit_check_pre_dataout(
686 struct iscsi_cmd *cmd,
687 unsigned char *buf)
688 {
689 int ret;
690 struct iscsi_conn *conn = cmd->conn;
691
692 ret = iscsit_dataout_within_command_recovery_check(cmd, buf);
693 if ((ret == DATAOUT_WITHIN_COMMAND_RECOVERY) ||
694 (ret == DATAOUT_CANNOT_RECOVER))
695 return ret;
696
697 ret = iscsit_dataout_check_datasn(cmd, buf);
698 if ((ret == DATAOUT_WITHIN_COMMAND_RECOVERY) ||
699 (ret == DATAOUT_CANNOT_RECOVER))
700 return ret;
701
702 if (cmd->unsolicited_data) {
703 ret = iscsit_dataout_check_unsolicited_sequence(cmd, buf);
704 if ((ret == DATAOUT_WITHIN_COMMAND_RECOVERY) ||
705 (ret == DATAOUT_CANNOT_RECOVER))
706 return ret;
707 } else {
708 ret = iscsit_dataout_check_sequence(cmd, buf);
709 if ((ret == DATAOUT_WITHIN_COMMAND_RECOVERY) ||
710 (ret == DATAOUT_CANNOT_RECOVER))
711 return ret;
712 }
713
714 return (conn->sess->sess_ops->DataPDUInOrder) ?
715 iscsit_dataout_pre_datapduinorder_yes(cmd, buf) :
716 iscsit_dataout_pre_datapduinorder_no(cmd, buf);
717 }
718
719 /*
720 * Called from iscsit_handle_data_out() after DataOUT Payload is received
721 * and CRC computed.
722 */
723 int iscsit_check_post_dataout(
724 struct iscsi_cmd *cmd,
725 unsigned char *buf,
726 u8 data_crc_failed)
727 {
728 struct iscsi_conn *conn = cmd->conn;
729
730 cmd->dataout_timeout_retries = 0;
731
732 if (!data_crc_failed)
733 return iscsit_dataout_post_crc_passed(cmd, buf);
734 else {
735 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
736 pr_err("Unable to recover from DataOUT CRC"
737 " failure while ERL=0, closing session.\n");
738 iscsit_add_reject_from_cmd(ISCSI_REASON_DATA_DIGEST_ERROR,
739 1, 0, buf, cmd);
740 return DATAOUT_CANNOT_RECOVER;
741 }
742
743 iscsit_add_reject_from_cmd(ISCSI_REASON_DATA_DIGEST_ERROR,
744 0, 0, buf, cmd);
745 return iscsit_dataout_post_crc_failed(cmd, buf);
746 }
747 }
748
749 static void iscsit_handle_time2retain_timeout(unsigned long data)
750 {
751 struct iscsi_session *sess = (struct iscsi_session *) data;
752 struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
753 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
754
755 spin_lock_bh(&se_tpg->session_lock);
756 if (sess->time2retain_timer_flags & ISCSI_TF_STOP) {
757 spin_unlock_bh(&se_tpg->session_lock);
758 return;
759 }
760 if (atomic_read(&sess->session_reinstatement)) {
761 pr_err("Exiting Time2Retain handler because"
762 " session_reinstatement=1\n");
763 spin_unlock_bh(&se_tpg->session_lock);
764 return;
765 }
766 sess->time2retain_timer_flags |= ISCSI_TF_EXPIRED;
767
768 pr_err("Time2Retain timer expired for SID: %u, cleaning up"
769 " iSCSI session.\n", sess->sid);
770 {
771 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
772
773 if (tiqn) {
774 spin_lock(&tiqn->sess_err_stats.lock);
775 strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
776 (void *)sess->sess_ops->InitiatorName);
777 tiqn->sess_err_stats.last_sess_failure_type =
778 ISCSI_SESS_ERR_CXN_TIMEOUT;
779 tiqn->sess_err_stats.cxn_timeout_errors++;
780 sess->conn_timeout_errors++;
781 spin_unlock(&tiqn->sess_err_stats.lock);
782 }
783 }
784
785 spin_unlock_bh(&se_tpg->session_lock);
786 iscsit_close_session(sess);
787 }
788
789 extern void iscsit_start_time2retain_handler(struct iscsi_session *sess)
790 {
791 int tpg_active;
792 /*
793 * Only start Time2Retain timer when the assoicated TPG is still in
794 * an ACTIVE (eg: not disabled or shutdown) state.
795 */
796 spin_lock(&ISCSI_TPG_S(sess)->tpg_state_lock);
797 tpg_active = (ISCSI_TPG_S(sess)->tpg_state == TPG_STATE_ACTIVE);
798 spin_unlock(&ISCSI_TPG_S(sess)->tpg_state_lock);
799
800 if (!tpg_active)
801 return;
802
803 if (sess->time2retain_timer_flags & ISCSI_TF_RUNNING)
804 return;
805
806 pr_debug("Starting Time2Retain timer for %u seconds on"
807 " SID: %u\n", sess->sess_ops->DefaultTime2Retain, sess->sid);
808
809 init_timer(&sess->time2retain_timer);
810 sess->time2retain_timer.expires =
811 (get_jiffies_64() + sess->sess_ops->DefaultTime2Retain * HZ);
812 sess->time2retain_timer.data = (unsigned long)sess;
813 sess->time2retain_timer.function = iscsit_handle_time2retain_timeout;
814 sess->time2retain_timer_flags &= ~ISCSI_TF_STOP;
815 sess->time2retain_timer_flags |= ISCSI_TF_RUNNING;
816 add_timer(&sess->time2retain_timer);
817 }
818
819 /*
820 * Called with spin_lock_bh(&struct se_portal_group->session_lock) held
821 */
822 extern int iscsit_stop_time2retain_timer(struct iscsi_session *sess)
823 {
824 struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
825 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
826
827 if (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)
828 return -1;
829
830 if (!(sess->time2retain_timer_flags & ISCSI_TF_RUNNING))
831 return 0;
832
833 sess->time2retain_timer_flags |= ISCSI_TF_STOP;
834 spin_unlock_bh(&se_tpg->session_lock);
835
836 del_timer_sync(&sess->time2retain_timer);
837
838 spin_lock_bh(&se_tpg->session_lock);
839 sess->time2retain_timer_flags &= ~ISCSI_TF_RUNNING;
840 pr_debug("Stopped Time2Retain Timer for SID: %u\n",
841 sess->sid);
842 return 0;
843 }
844
845 void iscsit_connection_reinstatement_rcfr(struct iscsi_conn *conn)
846 {
847 spin_lock_bh(&conn->state_lock);
848 if (atomic_read(&conn->connection_exit)) {
849 spin_unlock_bh(&conn->state_lock);
850 goto sleep;
851 }
852
853 if (atomic_read(&conn->transport_failed)) {
854 spin_unlock_bh(&conn->state_lock);
855 goto sleep;
856 }
857 spin_unlock_bh(&conn->state_lock);
858
859 iscsi_thread_set_force_reinstatement(conn);
860
861 sleep:
862 wait_for_completion(&conn->conn_wait_rcfr_comp);
863 complete(&conn->conn_post_wait_comp);
864 }
865
866 void iscsit_cause_connection_reinstatement(struct iscsi_conn *conn, int sleep)
867 {
868 spin_lock_bh(&conn->state_lock);
869 if (atomic_read(&conn->connection_exit)) {
870 spin_unlock_bh(&conn->state_lock);
871 return;
872 }
873
874 if (atomic_read(&conn->transport_failed)) {
875 spin_unlock_bh(&conn->state_lock);
876 return;
877 }
878
879 if (atomic_read(&conn->connection_reinstatement)) {
880 spin_unlock_bh(&conn->state_lock);
881 return;
882 }
883
884 if (iscsi_thread_set_force_reinstatement(conn) < 0) {
885 spin_unlock_bh(&conn->state_lock);
886 return;
887 }
888
889 atomic_set(&conn->connection_reinstatement, 1);
890 if (!sleep) {
891 spin_unlock_bh(&conn->state_lock);
892 return;
893 }
894
895 atomic_set(&conn->sleep_on_conn_wait_comp, 1);
896 spin_unlock_bh(&conn->state_lock);
897
898 wait_for_completion(&conn->conn_wait_comp);
899 complete(&conn->conn_post_wait_comp);
900 }
901
902 void iscsit_fall_back_to_erl0(struct iscsi_session *sess)
903 {
904 pr_debug("Falling back to ErrorRecoveryLevel=0 for SID:"
905 " %u\n", sess->sid);
906
907 atomic_set(&sess->session_fall_back_to_erl0, 1);
908 }
909
910 static void iscsit_handle_connection_cleanup(struct iscsi_conn *conn)
911 {
912 struct iscsi_session *sess = conn->sess;
913
914 if ((sess->sess_ops->ErrorRecoveryLevel == 2) &&
915 !atomic_read(&sess->session_reinstatement) &&
916 !atomic_read(&sess->session_fall_back_to_erl0))
917 iscsit_connection_recovery_transport_reset(conn);
918 else {
919 pr_debug("Performing cleanup for failed iSCSI"
920 " Connection ID: %hu from %s\n", conn->cid,
921 sess->sess_ops->InitiatorName);
922 iscsit_close_connection(conn);
923 }
924 }
925
926 extern void iscsit_take_action_for_connection_exit(struct iscsi_conn *conn)
927 {
928 spin_lock_bh(&conn->state_lock);
929 if (atomic_read(&conn->connection_exit)) {
930 spin_unlock_bh(&conn->state_lock);
931 return;
932 }
933 atomic_set(&conn->connection_exit, 1);
934
935 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT) {
936 spin_unlock_bh(&conn->state_lock);
937 iscsit_close_connection(conn);
938 return;
939 }
940
941 if (conn->conn_state == TARG_CONN_STATE_CLEANUP_WAIT) {
942 spin_unlock_bh(&conn->state_lock);
943 return;
944 }
945
946 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
947 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
948 spin_unlock_bh(&conn->state_lock);
949
950 iscsit_handle_connection_cleanup(conn);
951 }
952
953 /*
954 * This is the simple function that makes the magic of
955 * sync and steering happen in the follow paradoxical order:
956 *
957 * 0) Receive conn->of_marker (bytes left until next OFMarker)
958 * bytes into an offload buffer. When we pass the exact number
959 * of bytes in conn->of_marker, iscsit_dump_data_payload() and hence
960 * rx_data() will automatically receive the identical u32 marker
961 * values and store it in conn->of_marker_offset;
962 * 1) Now conn->of_marker_offset will contain the offset to the start
963 * of the next iSCSI PDU. Dump these remaining bytes into another
964 * offload buffer.
965 * 2) We are done!
966 * Next byte in the TCP stream will contain the next iSCSI PDU!
967 * Cool Huh?!
968 */
969 int iscsit_recover_from_unknown_opcode(struct iscsi_conn *conn)
970 {
971 /*
972 * Make sure the remaining bytes to next maker is a sane value.
973 */
974 if (conn->of_marker > (conn->conn_ops->OFMarkInt * 4)) {
975 pr_err("Remaining bytes to OFMarker: %u exceeds"
976 " OFMarkInt bytes: %u.\n", conn->of_marker,
977 conn->conn_ops->OFMarkInt * 4);
978 return -1;
979 }
980
981 pr_debug("Advancing %u bytes in TCP stream to get to the"
982 " next OFMarker.\n", conn->of_marker);
983
984 if (iscsit_dump_data_payload(conn, conn->of_marker, 0) < 0)
985 return -1;
986
987 /*
988 * Make sure the offset marker we retrived is a valid value.
989 */
990 if (conn->of_marker_offset > (ISCSI_HDR_LEN + (ISCSI_CRC_LEN * 2) +
991 conn->conn_ops->MaxRecvDataSegmentLength)) {
992 pr_err("OfMarker offset value: %u exceeds limit.\n",
993 conn->of_marker_offset);
994 return -1;
995 }
996
997 pr_debug("Discarding %u bytes of TCP stream to get to the"
998 " next iSCSI Opcode.\n", conn->of_marker_offset);
999
1000 if (iscsit_dump_data_payload(conn, conn->of_marker_offset, 0) < 0)
1001 return -1;
1002
1003 return 0;
1004 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree