Commit | Line | Data |
---|---|---|
e48354ce NB |
1 | /******************************************************************************* |
2 | * This file contains error recovery level one used by the iSCSI Target driver. | |
3 | * | |
4 | * \u00a9 Copyright 2007-2011 RisingTide Systems LLC. | |
5 | * | |
6 | * Licensed to the Linux Foundation under the General Public License (GPL) version 2. | |
7 | * | |
8 | * Author: Nicholas A. Bellinger <nab@linux-iscsi.org> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | ******************************************************************************/ | |
20 | ||
21 | #include <linux/list.h> | |
22 | #include <scsi/iscsi_proto.h> | |
23 | #include <target/target_core_base.h> | |
c4795fb2 | 24 | #include <target/target_core_fabric.h> |
3e1c81a9 | 25 | #include <target/iscsi/iscsi_transport.h> |
e48354ce NB |
26 | |
27 | #include "iscsi_target_core.h" | |
28 | #include "iscsi_target_seq_pdu_list.h" | |
29 | #include "iscsi_target_datain_values.h" | |
30 | #include "iscsi_target_device.h" | |
31 | #include "iscsi_target_tpg.h" | |
32 | #include "iscsi_target_util.h" | |
33 | #include "iscsi_target_erl0.h" | |
34 | #include "iscsi_target_erl1.h" | |
35 | #include "iscsi_target_erl2.h" | |
36 | #include "iscsi_target.h" | |
37 | ||
38 | #define OFFLOAD_BUF_SIZE 32768 | |
39 | ||
40 | /* | |
41 | * Used to dump excess datain payload for certain error recovery | |
42 | * situations. Receive in OFFLOAD_BUF_SIZE max of datain per rx_data(). | |
43 | * | |
44 | * dump_padding_digest denotes if padding and data digests need | |
45 | * to be dumped. | |
46 | */ | |
47 | int iscsit_dump_data_payload( | |
48 | struct iscsi_conn *conn, | |
49 | u32 buf_len, | |
50 | int dump_padding_digest) | |
51 | { | |
52 | char *buf, pad_bytes[4]; | |
53 | int ret = DATAOUT_WITHIN_COMMAND_RECOVERY, rx_got; | |
54 | u32 length, padding, offset = 0, size; | |
55 | struct kvec iov; | |
56 | ||
3e1c81a9 NB |
57 | if (conn->sess->sess_ops->RDMAExtensions) |
58 | return 0; | |
59 | ||
e48354ce NB |
60 | length = (buf_len > OFFLOAD_BUF_SIZE) ? OFFLOAD_BUF_SIZE : buf_len; |
61 | ||
62 | buf = kzalloc(length, GFP_ATOMIC); | |
63 | if (!buf) { | |
64 | pr_err("Unable to allocate %u bytes for offload" | |
65 | " buffer.\n", length); | |
66 | return -1; | |
67 | } | |
68 | memset(&iov, 0, sizeof(struct kvec)); | |
69 | ||
70 | while (offset < buf_len) { | |
71 | size = ((offset + length) > buf_len) ? | |
72 | (buf_len - offset) : length; | |
73 | ||
74 | iov.iov_len = size; | |
75 | iov.iov_base = buf; | |
76 | ||
77 | rx_got = rx_data(conn, &iov, 1, size); | |
78 | if (rx_got != size) { | |
79 | ret = DATAOUT_CANNOT_RECOVER; | |
80 | goto out; | |
81 | } | |
82 | ||
83 | offset += size; | |
84 | } | |
85 | ||
86 | if (!dump_padding_digest) | |
87 | goto out; | |
88 | ||
89 | padding = ((-buf_len) & 3); | |
90 | if (padding != 0) { | |
91 | iov.iov_len = padding; | |
92 | iov.iov_base = pad_bytes; | |
93 | ||
94 | rx_got = rx_data(conn, &iov, 1, padding); | |
95 | if (rx_got != padding) { | |
96 | ret = DATAOUT_CANNOT_RECOVER; | |
97 | goto out; | |
98 | } | |
99 | } | |
100 | ||
101 | if (conn->conn_ops->DataDigest) { | |
102 | u32 data_crc; | |
103 | ||
104 | iov.iov_len = ISCSI_CRC_LEN; | |
105 | iov.iov_base = &data_crc; | |
106 | ||
107 | rx_got = rx_data(conn, &iov, 1, ISCSI_CRC_LEN); | |
108 | if (rx_got != ISCSI_CRC_LEN) { | |
109 | ret = DATAOUT_CANNOT_RECOVER; | |
110 | goto out; | |
111 | } | |
112 | } | |
113 | ||
114 | out: | |
115 | kfree(buf); | |
116 | return ret; | |
117 | } | |
118 | ||
119 | /* | |
120 | * Used for retransmitting R2Ts from a R2T SNACK request. | |
121 | */ | |
122 | static int iscsit_send_recovery_r2t_for_snack( | |
123 | struct iscsi_cmd *cmd, | |
124 | struct iscsi_r2t *r2t) | |
125 | { | |
126 | /* | |
127 | * If the struct iscsi_r2t has not been sent yet, we can safely | |
128 | * ignore retransmission | |
129 | * of the R2TSN in question. | |
130 | */ | |
131 | spin_lock_bh(&cmd->r2t_lock); | |
132 | if (!r2t->sent_r2t) { | |
133 | spin_unlock_bh(&cmd->r2t_lock); | |
134 | return 0; | |
135 | } | |
136 | r2t->sent_r2t = 0; | |
137 | spin_unlock_bh(&cmd->r2t_lock); | |
138 | ||
139 | iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, ISTATE_SEND_R2T); | |
140 | ||
141 | return 0; | |
142 | } | |
143 | ||
144 | static int iscsit_handle_r2t_snack( | |
145 | struct iscsi_cmd *cmd, | |
146 | unsigned char *buf, | |
147 | u32 begrun, | |
148 | u32 runlength) | |
149 | { | |
150 | u32 last_r2tsn; | |
151 | struct iscsi_r2t *r2t; | |
152 | ||
153 | /* | |
154 | * Make sure the initiator is not requesting retransmission | |
155 | * of R2TSNs already acknowledged by a TMR TASK_REASSIGN. | |
156 | */ | |
157 | if ((cmd->cmd_flags & ICF_GOT_DATACK_SNACK) && | |
158 | (begrun <= cmd->acked_data_sn)) { | |
159 | pr_err("ITT: 0x%08x, R2T SNACK requesting" | |
160 | " retransmission of R2TSN: 0x%08x to 0x%08x but already" | |
161 | " acked to R2TSN: 0x%08x by TMR TASK_REASSIGN," | |
162 | " protocol error.\n", cmd->init_task_tag, begrun, | |
163 | (begrun + runlength), cmd->acked_data_sn); | |
164 | ||
165 | return iscsit_add_reject_from_cmd( | |
166 | ISCSI_REASON_PROTOCOL_ERROR, | |
167 | 1, 0, buf, cmd); | |
168 | } | |
169 | ||
170 | if (runlength) { | |
171 | if ((begrun + runlength) > cmd->r2t_sn) { | |
172 | pr_err("Command ITT: 0x%08x received R2T SNACK" | |
173 | " with BegRun: 0x%08x, RunLength: 0x%08x, exceeds" | |
174 | " current R2TSN: 0x%08x, protocol error.\n", | |
175 | cmd->init_task_tag, begrun, runlength, cmd->r2t_sn); | |
176 | return iscsit_add_reject_from_cmd( | |
177 | ISCSI_REASON_BOOKMARK_INVALID, 1, 0, buf, cmd); | |
178 | } | |
179 | last_r2tsn = (begrun + runlength); | |
180 | } else | |
181 | last_r2tsn = cmd->r2t_sn; | |
182 | ||
183 | while (begrun < last_r2tsn) { | |
184 | r2t = iscsit_get_holder_for_r2tsn(cmd, begrun); | |
185 | if (!r2t) | |
186 | return -1; | |
187 | if (iscsit_send_recovery_r2t_for_snack(cmd, r2t) < 0) | |
188 | return -1; | |
189 | ||
190 | begrun++; | |
191 | } | |
192 | ||
193 | return 0; | |
194 | } | |
195 | ||
196 | /* | |
197 | * Generates Offsets and NextBurstLength based on Begrun and Runlength | |
198 | * carried in a Data SNACK or ExpDataSN in TMR TASK_REASSIGN. | |
199 | * | |
200 | * For DataSequenceInOrder=Yes and DataPDUInOrder=[Yes,No] only. | |
201 | * | |
202 | * FIXME: How is this handled for a RData SNACK? | |
203 | */ | |
204 | int iscsit_create_recovery_datain_values_datasequenceinorder_yes( | |
205 | struct iscsi_cmd *cmd, | |
206 | struct iscsi_datain_req *dr) | |
207 | { | |
208 | u32 data_sn = 0, data_sn_count = 0; | |
209 | u32 pdu_start = 0, seq_no = 0; | |
210 | u32 begrun = dr->begrun; | |
211 | struct iscsi_conn *conn = cmd->conn; | |
212 | ||
213 | while (begrun > data_sn++) { | |
214 | data_sn_count++; | |
215 | if ((dr->next_burst_len + | |
216 | conn->conn_ops->MaxRecvDataSegmentLength) < | |
217 | conn->sess->sess_ops->MaxBurstLength) { | |
218 | dr->read_data_done += | |
219 | conn->conn_ops->MaxRecvDataSegmentLength; | |
220 | dr->next_burst_len += | |
221 | conn->conn_ops->MaxRecvDataSegmentLength; | |
222 | } else { | |
223 | dr->read_data_done += | |
224 | (conn->sess->sess_ops->MaxBurstLength - | |
225 | dr->next_burst_len); | |
226 | dr->next_burst_len = 0; | |
227 | pdu_start += data_sn_count; | |
228 | data_sn_count = 0; | |
229 | seq_no++; | |
230 | } | |
231 | } | |
232 | ||
233 | if (!conn->sess->sess_ops->DataPDUInOrder) { | |
234 | cmd->seq_no = seq_no; | |
235 | cmd->pdu_start = pdu_start; | |
236 | cmd->pdu_send_order = data_sn_count; | |
237 | } | |
238 | ||
239 | return 0; | |
240 | } | |
241 | ||
242 | /* | |
243 | * Generates Offsets and NextBurstLength based on Begrun and Runlength | |
244 | * carried in a Data SNACK or ExpDataSN in TMR TASK_REASSIGN. | |
245 | * | |
246 | * For DataSequenceInOrder=No and DataPDUInOrder=[Yes,No] only. | |
247 | * | |
248 | * FIXME: How is this handled for a RData SNACK? | |
249 | */ | |
250 | int iscsit_create_recovery_datain_values_datasequenceinorder_no( | |
251 | struct iscsi_cmd *cmd, | |
252 | struct iscsi_datain_req *dr) | |
253 | { | |
254 | int found_seq = 0, i; | |
255 | u32 data_sn, read_data_done = 0, seq_send_order = 0; | |
256 | u32 begrun = dr->begrun; | |
257 | u32 runlength = dr->runlength; | |
258 | struct iscsi_conn *conn = cmd->conn; | |
259 | struct iscsi_seq *first_seq = NULL, *seq = NULL; | |
260 | ||
261 | if (!cmd->seq_list) { | |
262 | pr_err("struct iscsi_cmd->seq_list is NULL!\n"); | |
263 | return -1; | |
264 | } | |
265 | ||
266 | /* | |
267 | * Calculate read_data_done for all sequences containing a | |
268 | * first_datasn and last_datasn less than the BegRun. | |
269 | * | |
270 | * Locate the struct iscsi_seq the BegRun lies within and calculate | |
271 | * NextBurstLenghth up to the DataSN based on MaxRecvDataSegmentLength. | |
272 | * | |
273 | * Also use struct iscsi_seq->seq_send_order to determine where to start. | |
274 | */ | |
275 | for (i = 0; i < cmd->seq_count; i++) { | |
276 | seq = &cmd->seq_list[i]; | |
277 | ||
278 | if (!seq->seq_send_order) | |
279 | first_seq = seq; | |
280 | ||
281 | /* | |
282 | * No data has been transferred for this DataIN sequence, so the | |
283 | * seq->first_datasn and seq->last_datasn have not been set. | |
284 | */ | |
285 | if (!seq->sent) { | |
e48354ce NB |
286 | pr_err("Ignoring non-sent sequence 0x%08x ->" |
287 | " 0x%08x\n\n", seq->first_datasn, | |
288 | seq->last_datasn); | |
e48354ce NB |
289 | continue; |
290 | } | |
291 | ||
292 | /* | |
293 | * This DataIN sequence is precedes the received BegRun, add the | |
294 | * total xfer_len of the sequence to read_data_done and reset | |
295 | * seq->pdu_send_order. | |
296 | */ | |
297 | if ((seq->first_datasn < begrun) && | |
298 | (seq->last_datasn < begrun)) { | |
e48354ce NB |
299 | pr_err("Pre BegRun sequence 0x%08x ->" |
300 | " 0x%08x\n", seq->first_datasn, | |
301 | seq->last_datasn); | |
8b1e1244 | 302 | |
e48354ce NB |
303 | read_data_done += cmd->seq_list[i].xfer_len; |
304 | seq->next_burst_len = seq->pdu_send_order = 0; | |
305 | continue; | |
306 | } | |
307 | ||
308 | /* | |
309 | * The BegRun lies within this DataIN sequence. | |
310 | */ | |
311 | if ((seq->first_datasn <= begrun) && | |
312 | (seq->last_datasn >= begrun)) { | |
e48354ce NB |
313 | pr_err("Found sequence begrun: 0x%08x in" |
314 | " 0x%08x -> 0x%08x\n", begrun, | |
315 | seq->first_datasn, seq->last_datasn); | |
8b1e1244 | 316 | |
e48354ce NB |
317 | seq_send_order = seq->seq_send_order; |
318 | data_sn = seq->first_datasn; | |
319 | seq->next_burst_len = seq->pdu_send_order = 0; | |
320 | found_seq = 1; | |
321 | ||
322 | /* | |
323 | * For DataPDUInOrder=Yes, while the first DataSN of | |
324 | * the sequence is less than the received BegRun, add | |
325 | * the MaxRecvDataSegmentLength to read_data_done and | |
326 | * to the sequence's next_burst_len; | |
327 | * | |
328 | * For DataPDUInOrder=No, while the first DataSN of the | |
329 | * sequence is less than the received BegRun, find the | |
330 | * struct iscsi_pdu of the DataSN in question and add the | |
331 | * MaxRecvDataSegmentLength to read_data_done and to the | |
332 | * sequence's next_burst_len; | |
333 | */ | |
334 | if (conn->sess->sess_ops->DataPDUInOrder) { | |
335 | while (data_sn < begrun) { | |
336 | seq->pdu_send_order++; | |
337 | read_data_done += | |
338 | conn->conn_ops->MaxRecvDataSegmentLength; | |
339 | seq->next_burst_len += | |
340 | conn->conn_ops->MaxRecvDataSegmentLength; | |
341 | data_sn++; | |
342 | } | |
343 | } else { | |
344 | int j; | |
345 | struct iscsi_pdu *pdu; | |
346 | ||
347 | while (data_sn < begrun) { | |
348 | seq->pdu_send_order++; | |
349 | ||
350 | for (j = 0; j < seq->pdu_count; j++) { | |
351 | pdu = &cmd->pdu_list[ | |
352 | seq->pdu_start + j]; | |
353 | if (pdu->data_sn == data_sn) { | |
354 | read_data_done += | |
355 | pdu->length; | |
356 | seq->next_burst_len += | |
357 | pdu->length; | |
358 | } | |
359 | } | |
360 | data_sn++; | |
361 | } | |
362 | } | |
363 | continue; | |
364 | } | |
365 | ||
366 | /* | |
367 | * This DataIN sequence is larger than the received BegRun, | |
368 | * reset seq->pdu_send_order and continue. | |
369 | */ | |
370 | if ((seq->first_datasn > begrun) || | |
371 | (seq->last_datasn > begrun)) { | |
e48354ce NB |
372 | pr_err("Post BegRun sequence 0x%08x -> 0x%08x\n", |
373 | seq->first_datasn, seq->last_datasn); | |
8b1e1244 | 374 | |
e48354ce NB |
375 | seq->next_burst_len = seq->pdu_send_order = 0; |
376 | continue; | |
377 | } | |
378 | } | |
379 | ||
380 | if (!found_seq) { | |
381 | if (!begrun) { | |
382 | if (!first_seq) { | |
383 | pr_err("ITT: 0x%08x, Begrun: 0x%08x" | |
384 | " but first_seq is NULL\n", | |
385 | cmd->init_task_tag, begrun); | |
386 | return -1; | |
387 | } | |
388 | seq_send_order = first_seq->seq_send_order; | |
389 | seq->next_burst_len = seq->pdu_send_order = 0; | |
390 | goto done; | |
391 | } | |
392 | ||
393 | pr_err("Unable to locate struct iscsi_seq for ITT: 0x%08x," | |
394 | " BegRun: 0x%08x, RunLength: 0x%08x while" | |
395 | " DataSequenceInOrder=No and DataPDUInOrder=%s.\n", | |
396 | cmd->init_task_tag, begrun, runlength, | |
397 | (conn->sess->sess_ops->DataPDUInOrder) ? "Yes" : "No"); | |
398 | return -1; | |
399 | } | |
400 | ||
401 | done: | |
402 | dr->read_data_done = read_data_done; | |
403 | dr->seq_send_order = seq_send_order; | |
404 | ||
405 | return 0; | |
406 | } | |
407 | ||
408 | static int iscsit_handle_recovery_datain( | |
409 | struct iscsi_cmd *cmd, | |
410 | unsigned char *buf, | |
411 | u32 begrun, | |
412 | u32 runlength) | |
413 | { | |
414 | struct iscsi_conn *conn = cmd->conn; | |
415 | struct iscsi_datain_req *dr; | |
416 | struct se_cmd *se_cmd = &cmd->se_cmd; | |
417 | ||
7d680f3b | 418 | if (!(se_cmd->transport_state & CMD_T_COMPLETE)) { |
e48354ce NB |
419 | pr_err("Ignoring ITT: 0x%08x Data SNACK\n", |
420 | cmd->init_task_tag); | |
421 | return 0; | |
422 | } | |
423 | ||
424 | /* | |
425 | * Make sure the initiator is not requesting retransmission | |
426 | * of DataSNs already acknowledged by a Data ACK SNACK. | |
427 | */ | |
428 | if ((cmd->cmd_flags & ICF_GOT_DATACK_SNACK) && | |
429 | (begrun <= cmd->acked_data_sn)) { | |
430 | pr_err("ITT: 0x%08x, Data SNACK requesting" | |
431 | " retransmission of DataSN: 0x%08x to 0x%08x but" | |
432 | " already acked to DataSN: 0x%08x by Data ACK SNACK," | |
433 | " protocol error.\n", cmd->init_task_tag, begrun, | |
434 | (begrun + runlength), cmd->acked_data_sn); | |
435 | ||
436 | return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR, | |
437 | 1, 0, buf, cmd); | |
438 | } | |
439 | ||
440 | /* | |
441 | * Make sure BegRun and RunLength in the Data SNACK are sane. | |
442 | * Note: (cmd->data_sn - 1) will carry the maximum DataSN sent. | |
443 | */ | |
444 | if ((begrun + runlength) > (cmd->data_sn - 1)) { | |
445 | pr_err("Initiator requesting BegRun: 0x%08x, RunLength" | |
446 | ": 0x%08x greater than maximum DataSN: 0x%08x.\n", | |
447 | begrun, runlength, (cmd->data_sn - 1)); | |
448 | return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID, | |
449 | 1, 0, buf, cmd); | |
450 | } | |
451 | ||
452 | dr = iscsit_allocate_datain_req(); | |
453 | if (!dr) | |
454 | return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_NO_RESOURCES, | |
455 | 1, 0, buf, cmd); | |
456 | ||
457 | dr->data_sn = dr->begrun = begrun; | |
458 | dr->runlength = runlength; | |
459 | dr->generate_recovery_values = 1; | |
460 | dr->recovery = DATAIN_WITHIN_COMMAND_RECOVERY; | |
461 | ||
462 | iscsit_attach_datain_req(cmd, dr); | |
463 | ||
464 | cmd->i_state = ISTATE_SEND_DATAIN; | |
465 | iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); | |
466 | ||
467 | return 0; | |
468 | } | |
469 | ||
470 | int iscsit_handle_recovery_datain_or_r2t( | |
471 | struct iscsi_conn *conn, | |
472 | unsigned char *buf, | |
66c7db68 | 473 | itt_t init_task_tag, |
e48354ce NB |
474 | u32 targ_xfer_tag, |
475 | u32 begrun, | |
476 | u32 runlength) | |
477 | { | |
478 | struct iscsi_cmd *cmd; | |
479 | ||
480 | cmd = iscsit_find_cmd_from_itt(conn, init_task_tag); | |
481 | if (!cmd) | |
482 | return 0; | |
483 | ||
484 | /* | |
485 | * FIXME: This will not work for bidi commands. | |
486 | */ | |
487 | switch (cmd->data_direction) { | |
488 | case DMA_TO_DEVICE: | |
489 | return iscsit_handle_r2t_snack(cmd, buf, begrun, runlength); | |
490 | case DMA_FROM_DEVICE: | |
491 | return iscsit_handle_recovery_datain(cmd, buf, begrun, | |
492 | runlength); | |
493 | default: | |
494 | pr_err("Unknown cmd->data_direction: 0x%02x\n", | |
495 | cmd->data_direction); | |
496 | return -1; | |
497 | } | |
498 | ||
499 | return 0; | |
500 | } | |
501 | ||
502 | /* #warning FIXME: Status SNACK needs to be dependent on OPCODE!!! */ | |
503 | int iscsit_handle_status_snack( | |
504 | struct iscsi_conn *conn, | |
66c7db68 | 505 | itt_t init_task_tag, |
e48354ce NB |
506 | u32 targ_xfer_tag, |
507 | u32 begrun, | |
508 | u32 runlength) | |
509 | { | |
510 | struct iscsi_cmd *cmd = NULL; | |
511 | u32 last_statsn; | |
512 | int found_cmd; | |
513 | ||
514 | if (conn->exp_statsn > begrun) { | |
515 | pr_err("Got Status SNACK Begrun: 0x%08x, RunLength:" | |
516 | " 0x%08x but already got ExpStatSN: 0x%08x on CID:" | |
517 | " %hu.\n", begrun, runlength, conn->exp_statsn, | |
518 | conn->cid); | |
519 | return 0; | |
520 | } | |
521 | ||
522 | last_statsn = (!runlength) ? conn->stat_sn : (begrun + runlength); | |
523 | ||
524 | while (begrun < last_statsn) { | |
525 | found_cmd = 0; | |
526 | ||
527 | spin_lock_bh(&conn->cmd_lock); | |
2fbb471e | 528 | list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { |
e48354ce NB |
529 | if (cmd->stat_sn == begrun) { |
530 | found_cmd = 1; | |
531 | break; | |
532 | } | |
533 | } | |
534 | spin_unlock_bh(&conn->cmd_lock); | |
535 | ||
536 | if (!found_cmd) { | |
537 | pr_err("Unable to find StatSN: 0x%08x for" | |
538 | " a Status SNACK, assuming this was a" | |
539 | " protactic SNACK for an untransmitted" | |
540 | " StatSN, ignoring.\n", begrun); | |
541 | begrun++; | |
542 | continue; | |
543 | } | |
544 | ||
545 | spin_lock_bh(&cmd->istate_lock); | |
546 | if (cmd->i_state == ISTATE_SEND_DATAIN) { | |
547 | spin_unlock_bh(&cmd->istate_lock); | |
548 | pr_err("Ignoring Status SNACK for BegRun:" | |
549 | " 0x%08x, RunLength: 0x%08x, assuming this was" | |
550 | " a protactic SNACK for an untransmitted" | |
551 | " StatSN\n", begrun, runlength); | |
552 | begrun++; | |
553 | continue; | |
554 | } | |
555 | spin_unlock_bh(&cmd->istate_lock); | |
556 | ||
557 | cmd->i_state = ISTATE_SEND_STATUS_RECOVERY; | |
558 | iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); | |
559 | begrun++; | |
560 | } | |
561 | ||
562 | return 0; | |
563 | } | |
564 | ||
565 | int iscsit_handle_data_ack( | |
566 | struct iscsi_conn *conn, | |
567 | u32 targ_xfer_tag, | |
568 | u32 begrun, | |
569 | u32 runlength) | |
570 | { | |
571 | struct iscsi_cmd *cmd = NULL; | |
572 | ||
573 | cmd = iscsit_find_cmd_from_ttt(conn, targ_xfer_tag); | |
574 | if (!cmd) { | |
575 | pr_err("Data ACK SNACK for TTT: 0x%08x is" | |
576 | " invalid.\n", targ_xfer_tag); | |
577 | return -1; | |
578 | } | |
579 | ||
580 | if (begrun <= cmd->acked_data_sn) { | |
581 | pr_err("ITT: 0x%08x Data ACK SNACK BegRUN: 0x%08x is" | |
582 | " less than the already acked DataSN: 0x%08x.\n", | |
583 | cmd->init_task_tag, begrun, cmd->acked_data_sn); | |
584 | return -1; | |
585 | } | |
586 | ||
587 | /* | |
588 | * For Data ACK SNACK, BegRun is the next expected DataSN. | |
589 | * (see iSCSI v19: 10.16.6) | |
590 | */ | |
591 | cmd->cmd_flags |= ICF_GOT_DATACK_SNACK; | |
592 | cmd->acked_data_sn = (begrun - 1); | |
593 | ||
594 | pr_debug("Received Data ACK SNACK for ITT: 0x%08x," | |
595 | " updated acked DataSN to 0x%08x.\n", | |
596 | cmd->init_task_tag, cmd->acked_data_sn); | |
597 | ||
598 | return 0; | |
599 | } | |
600 | ||
601 | static int iscsit_send_recovery_r2t( | |
602 | struct iscsi_cmd *cmd, | |
603 | u32 offset, | |
604 | u32 xfer_len) | |
605 | { | |
606 | int ret; | |
607 | ||
608 | spin_lock_bh(&cmd->r2t_lock); | |
609 | ret = iscsit_add_r2t_to_list(cmd, offset, xfer_len, 1, 0); | |
610 | spin_unlock_bh(&cmd->r2t_lock); | |
611 | ||
612 | return ret; | |
613 | } | |
614 | ||
615 | int iscsit_dataout_datapduinorder_no_fbit( | |
616 | struct iscsi_cmd *cmd, | |
617 | struct iscsi_pdu *pdu) | |
618 | { | |
619 | int i, send_recovery_r2t = 0, recovery = 0; | |
620 | u32 length = 0, offset = 0, pdu_count = 0, xfer_len = 0; | |
621 | struct iscsi_conn *conn = cmd->conn; | |
622 | struct iscsi_pdu *first_pdu = NULL; | |
623 | ||
624 | /* | |
625 | * Get an struct iscsi_pdu pointer to the first PDU, and total PDU count | |
626 | * of the DataOUT sequence. | |
627 | */ | |
628 | if (conn->sess->sess_ops->DataSequenceInOrder) { | |
629 | for (i = 0; i < cmd->pdu_count; i++) { | |
630 | if (cmd->pdu_list[i].seq_no == pdu->seq_no) { | |
631 | if (!first_pdu) | |
632 | first_pdu = &cmd->pdu_list[i]; | |
633 | xfer_len += cmd->pdu_list[i].length; | |
634 | pdu_count++; | |
635 | } else if (pdu_count) | |
636 | break; | |
637 | } | |
638 | } else { | |
639 | struct iscsi_seq *seq = cmd->seq_ptr; | |
640 | ||
641 | first_pdu = &cmd->pdu_list[seq->pdu_start]; | |
642 | pdu_count = seq->pdu_count; | |
643 | } | |
644 | ||
645 | if (!first_pdu || !pdu_count) | |
646 | return DATAOUT_CANNOT_RECOVER; | |
647 | ||
648 | /* | |
649 | * Loop through the ending DataOUT Sequence checking each struct iscsi_pdu. | |
650 | * The following ugly logic does batching of not received PDUs. | |
651 | */ | |
652 | for (i = 0; i < pdu_count; i++) { | |
653 | if (first_pdu[i].status == ISCSI_PDU_RECEIVED_OK) { | |
654 | if (!send_recovery_r2t) | |
655 | continue; | |
656 | ||
657 | if (iscsit_send_recovery_r2t(cmd, offset, length) < 0) | |
658 | return DATAOUT_CANNOT_RECOVER; | |
659 | ||
660 | send_recovery_r2t = length = offset = 0; | |
661 | continue; | |
662 | } | |
663 | /* | |
664 | * Set recovery = 1 for any missing, CRC failed, or timed | |
665 | * out PDUs to let the DataOUT logic know that this sequence | |
666 | * has not been completed yet. | |
667 | * | |
668 | * Also, only send a Recovery R2T for ISCSI_PDU_NOT_RECEIVED. | |
669 | * We assume if the PDU either failed CRC or timed out | |
670 | * that a Recovery R2T has already been sent. | |
671 | */ | |
672 | recovery = 1; | |
673 | ||
674 | if (first_pdu[i].status != ISCSI_PDU_NOT_RECEIVED) | |
675 | continue; | |
676 | ||
677 | if (!offset) | |
678 | offset = first_pdu[i].offset; | |
679 | length += first_pdu[i].length; | |
680 | ||
681 | send_recovery_r2t = 1; | |
682 | } | |
683 | ||
684 | if (send_recovery_r2t) | |
685 | if (iscsit_send_recovery_r2t(cmd, offset, length) < 0) | |
686 | return DATAOUT_CANNOT_RECOVER; | |
687 | ||
688 | return (!recovery) ? DATAOUT_NORMAL : DATAOUT_WITHIN_COMMAND_RECOVERY; | |
689 | } | |
690 | ||
691 | static int iscsit_recalculate_dataout_values( | |
692 | struct iscsi_cmd *cmd, | |
693 | u32 pdu_offset, | |
694 | u32 pdu_length, | |
695 | u32 *r2t_offset, | |
696 | u32 *r2t_length) | |
697 | { | |
698 | int i; | |
699 | struct iscsi_conn *conn = cmd->conn; | |
700 | struct iscsi_pdu *pdu = NULL; | |
701 | ||
702 | if (conn->sess->sess_ops->DataSequenceInOrder) { | |
703 | cmd->data_sn = 0; | |
704 | ||
705 | if (conn->sess->sess_ops->DataPDUInOrder) { | |
706 | *r2t_offset = cmd->write_data_done; | |
707 | *r2t_length = (cmd->seq_end_offset - | |
708 | cmd->write_data_done); | |
709 | return 0; | |
710 | } | |
711 | ||
712 | *r2t_offset = cmd->seq_start_offset; | |
713 | *r2t_length = (cmd->seq_end_offset - cmd->seq_start_offset); | |
714 | ||
715 | for (i = 0; i < cmd->pdu_count; i++) { | |
716 | pdu = &cmd->pdu_list[i]; | |
717 | ||
718 | if (pdu->status != ISCSI_PDU_RECEIVED_OK) | |
719 | continue; | |
720 | ||
721 | if ((pdu->offset >= cmd->seq_start_offset) && | |
722 | ((pdu->offset + pdu->length) <= | |
723 | cmd->seq_end_offset)) { | |
724 | if (!cmd->unsolicited_data) | |
725 | cmd->next_burst_len -= pdu->length; | |
726 | else | |
727 | cmd->first_burst_len -= pdu->length; | |
728 | ||
729 | cmd->write_data_done -= pdu->length; | |
730 | pdu->status = ISCSI_PDU_NOT_RECEIVED; | |
731 | } | |
732 | } | |
733 | } else { | |
734 | struct iscsi_seq *seq = NULL; | |
735 | ||
736 | seq = iscsit_get_seq_holder(cmd, pdu_offset, pdu_length); | |
737 | if (!seq) | |
738 | return -1; | |
739 | ||
740 | *r2t_offset = seq->orig_offset; | |
741 | *r2t_length = seq->xfer_len; | |
742 | ||
743 | cmd->write_data_done -= (seq->offset - seq->orig_offset); | |
744 | if (cmd->immediate_data) | |
745 | cmd->first_burst_len = cmd->write_data_done; | |
746 | ||
747 | seq->data_sn = 0; | |
748 | seq->offset = seq->orig_offset; | |
749 | seq->next_burst_len = 0; | |
750 | seq->status = DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY; | |
751 | ||
752 | if (conn->sess->sess_ops->DataPDUInOrder) | |
753 | return 0; | |
754 | ||
755 | for (i = 0; i < seq->pdu_count; i++) { | |
756 | pdu = &cmd->pdu_list[i+seq->pdu_start]; | |
757 | ||
758 | if (pdu->status != ISCSI_PDU_RECEIVED_OK) | |
759 | continue; | |
760 | ||
761 | pdu->status = ISCSI_PDU_NOT_RECEIVED; | |
762 | } | |
763 | } | |
764 | ||
765 | return 0; | |
766 | } | |
767 | ||
768 | int iscsit_recover_dataout_sequence( | |
769 | struct iscsi_cmd *cmd, | |
770 | u32 pdu_offset, | |
771 | u32 pdu_length) | |
772 | { | |
773 | u32 r2t_length = 0, r2t_offset = 0; | |
774 | ||
775 | spin_lock_bh(&cmd->istate_lock); | |
776 | cmd->cmd_flags |= ICF_WITHIN_COMMAND_RECOVERY; | |
777 | spin_unlock_bh(&cmd->istate_lock); | |
778 | ||
779 | if (iscsit_recalculate_dataout_values(cmd, pdu_offset, pdu_length, | |
780 | &r2t_offset, &r2t_length) < 0) | |
781 | return DATAOUT_CANNOT_RECOVER; | |
782 | ||
783 | iscsit_send_recovery_r2t(cmd, r2t_offset, r2t_length); | |
784 | ||
785 | return DATAOUT_WITHIN_COMMAND_RECOVERY; | |
786 | } | |
787 | ||
788 | static struct iscsi_ooo_cmdsn *iscsit_allocate_ooo_cmdsn(void) | |
789 | { | |
790 | struct iscsi_ooo_cmdsn *ooo_cmdsn = NULL; | |
791 | ||
792 | ooo_cmdsn = kmem_cache_zalloc(lio_ooo_cache, GFP_ATOMIC); | |
793 | if (!ooo_cmdsn) { | |
794 | pr_err("Unable to allocate memory for" | |
795 | " struct iscsi_ooo_cmdsn.\n"); | |
796 | return NULL; | |
797 | } | |
798 | INIT_LIST_HEAD(&ooo_cmdsn->ooo_list); | |
799 | ||
800 | return ooo_cmdsn; | |
801 | } | |
802 | ||
803 | /* | |
804 | * Called with sess->cmdsn_mutex held. | |
805 | */ | |
806 | static int iscsit_attach_ooo_cmdsn( | |
807 | struct iscsi_session *sess, | |
808 | struct iscsi_ooo_cmdsn *ooo_cmdsn) | |
809 | { | |
810 | struct iscsi_ooo_cmdsn *ooo_tail, *ooo_tmp; | |
811 | /* | |
812 | * We attach the struct iscsi_ooo_cmdsn entry to the out of order | |
813 | * list in increasing CmdSN order. | |
814 | * This allows iscsi_execute_ooo_cmdsns() to detect any | |
815 | * additional CmdSN holes while performing delayed execution. | |
816 | */ | |
817 | if (list_empty(&sess->sess_ooo_cmdsn_list)) | |
818 | list_add_tail(&ooo_cmdsn->ooo_list, | |
819 | &sess->sess_ooo_cmdsn_list); | |
820 | else { | |
821 | ooo_tail = list_entry(sess->sess_ooo_cmdsn_list.prev, | |
822 | typeof(*ooo_tail), ooo_list); | |
823 | /* | |
824 | * CmdSN is greater than the tail of the list. | |
825 | */ | |
826 | if (ooo_tail->cmdsn < ooo_cmdsn->cmdsn) | |
827 | list_add_tail(&ooo_cmdsn->ooo_list, | |
828 | &sess->sess_ooo_cmdsn_list); | |
829 | else { | |
830 | /* | |
831 | * CmdSN is either lower than the head, or somewhere | |
832 | * in the middle. | |
833 | */ | |
834 | list_for_each_entry(ooo_tmp, &sess->sess_ooo_cmdsn_list, | |
835 | ooo_list) { | |
387e96c0 | 836 | if (ooo_tmp->cmdsn < ooo_cmdsn->cmdsn) |
e48354ce NB |
837 | continue; |
838 | ||
839 | list_add(&ooo_cmdsn->ooo_list, | |
840 | &ooo_tmp->ooo_list); | |
841 | break; | |
842 | } | |
843 | } | |
844 | } | |
845 | ||
846 | return 0; | |
847 | } | |
848 | ||
849 | /* | |
850 | * Removes an struct iscsi_ooo_cmdsn from a session's list, | |
851 | * called with struct iscsi_session->cmdsn_mutex held. | |
852 | */ | |
853 | void iscsit_remove_ooo_cmdsn( | |
854 | struct iscsi_session *sess, | |
855 | struct iscsi_ooo_cmdsn *ooo_cmdsn) | |
856 | { | |
857 | list_del(&ooo_cmdsn->ooo_list); | |
858 | kmem_cache_free(lio_ooo_cache, ooo_cmdsn); | |
859 | } | |
860 | ||
861 | void iscsit_clear_ooo_cmdsns_for_conn(struct iscsi_conn *conn) | |
862 | { | |
863 | struct iscsi_ooo_cmdsn *ooo_cmdsn; | |
864 | struct iscsi_session *sess = conn->sess; | |
865 | ||
866 | mutex_lock(&sess->cmdsn_mutex); | |
867 | list_for_each_entry(ooo_cmdsn, &sess->sess_ooo_cmdsn_list, ooo_list) { | |
868 | if (ooo_cmdsn->cid != conn->cid) | |
869 | continue; | |
870 | ||
871 | ooo_cmdsn->cmd = NULL; | |
872 | } | |
873 | mutex_unlock(&sess->cmdsn_mutex); | |
874 | } | |
875 | ||
876 | /* | |
877 | * Called with sess->cmdsn_mutex held. | |
878 | */ | |
879 | int iscsit_execute_ooo_cmdsns(struct iscsi_session *sess) | |
880 | { | |
881 | int ooo_count = 0; | |
882 | struct iscsi_cmd *cmd = NULL; | |
883 | struct iscsi_ooo_cmdsn *ooo_cmdsn, *ooo_cmdsn_tmp; | |
884 | ||
885 | list_for_each_entry_safe(ooo_cmdsn, ooo_cmdsn_tmp, | |
886 | &sess->sess_ooo_cmdsn_list, ooo_list) { | |
887 | if (ooo_cmdsn->cmdsn != sess->exp_cmd_sn) | |
888 | continue; | |
889 | ||
890 | if (!ooo_cmdsn->cmd) { | |
891 | sess->exp_cmd_sn++; | |
892 | iscsit_remove_ooo_cmdsn(sess, ooo_cmdsn); | |
893 | continue; | |
894 | } | |
895 | ||
896 | cmd = ooo_cmdsn->cmd; | |
897 | cmd->i_state = cmd->deferred_i_state; | |
898 | ooo_count++; | |
899 | sess->exp_cmd_sn++; | |
900 | pr_debug("Executing out of order CmdSN: 0x%08x," | |
901 | " incremented ExpCmdSN to 0x%08x.\n", | |
902 | cmd->cmd_sn, sess->exp_cmd_sn); | |
903 | ||
904 | iscsit_remove_ooo_cmdsn(sess, ooo_cmdsn); | |
905 | ||
906 | if (iscsit_execute_cmd(cmd, 1) < 0) | |
907 | return -1; | |
908 | ||
909 | continue; | |
910 | } | |
911 | ||
912 | return ooo_count; | |
913 | } | |
914 | ||
915 | /* | |
916 | * Called either: | |
917 | * | |
918 | * 1. With sess->cmdsn_mutex held from iscsi_execute_ooo_cmdsns() | |
919 | * or iscsi_check_received_cmdsn(). | |
920 | * 2. With no locks held directly from iscsi_handle_XXX_pdu() functions | |
921 | * for immediate commands. | |
922 | */ | |
923 | int iscsit_execute_cmd(struct iscsi_cmd *cmd, int ooo) | |
924 | { | |
925 | struct se_cmd *se_cmd = &cmd->se_cmd; | |
3e1c81a9 | 926 | struct iscsi_conn *conn = cmd->conn; |
e48354ce NB |
927 | int lr = 0; |
928 | ||
929 | spin_lock_bh(&cmd->istate_lock); | |
930 | if (ooo) | |
931 | cmd->cmd_flags &= ~ICF_OOO_CMDSN; | |
932 | ||
933 | switch (cmd->iscsi_opcode) { | |
934 | case ISCSI_OP_SCSI_CMD: | |
935 | /* | |
936 | * Go ahead and send the CHECK_CONDITION status for | |
de103c93 | 937 | * any SCSI CDB exceptions that may have occurred. |
e48354ce | 938 | */ |
de103c93 CH |
939 | if (cmd->sense_reason) { |
940 | if (cmd->sense_reason == TCM_RESERVATION_CONFLICT) { | |
e48354ce NB |
941 | cmd->i_state = ISTATE_SEND_STATUS; |
942 | spin_unlock_bh(&cmd->istate_lock); | |
943 | iscsit_add_cmd_to_response_queue(cmd, cmd->conn, | |
944 | cmd->i_state); | |
945 | return 0; | |
946 | } | |
947 | spin_unlock_bh(&cmd->istate_lock); | |
948 | /* | |
949 | * Determine if delayed TASK_ABORTED status for WRITEs | |
950 | * should be sent now if no unsolicited data out | |
951 | * payloads are expected, or if the delayed status | |
952 | * should be sent after unsolicited data out with | |
953 | * ISCSI_FLAG_CMD_FINAL set in iscsi_handle_data_out() | |
954 | */ | |
955 | if (transport_check_aborted_status(se_cmd, | |
956 | (cmd->unsolicited_data == 0)) != 0) | |
957 | return 0; | |
958 | /* | |
959 | * Otherwise send CHECK_CONDITION and sense for | |
960 | * exception | |
961 | */ | |
962 | return transport_send_check_condition_and_sense(se_cmd, | |
de103c93 | 963 | cmd->sense_reason, 0); |
e48354ce NB |
964 | } |
965 | /* | |
966 | * Special case for delayed CmdSN with Immediate | |
967 | * Data and/or Unsolicited Data Out attached. | |
968 | */ | |
969 | if (cmd->immediate_data) { | |
970 | if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) { | |
971 | spin_unlock_bh(&cmd->istate_lock); | |
67441b68 CH |
972 | target_execute_cmd(&cmd->se_cmd); |
973 | return 0; | |
e48354ce NB |
974 | } |
975 | spin_unlock_bh(&cmd->istate_lock); | |
976 | ||
977 | if (!(cmd->cmd_flags & | |
978 | ICF_NON_IMMEDIATE_UNSOLICITED_DATA)) { | |
979 | /* | |
980 | * Send the delayed TASK_ABORTED status for | |
981 | * WRITEs if no more unsolicitied data is | |
982 | * expected. | |
983 | */ | |
984 | if (transport_check_aborted_status(se_cmd, 1) | |
985 | != 0) | |
986 | return 0; | |
987 | ||
988 | iscsit_set_dataout_sequence_values(cmd); | |
3e1c81a9 | 989 | conn->conn_transport->iscsit_get_dataout(conn, cmd, false); |
e48354ce NB |
990 | } |
991 | return 0; | |
992 | } | |
993 | /* | |
994 | * The default handler. | |
995 | */ | |
996 | spin_unlock_bh(&cmd->istate_lock); | |
997 | ||
998 | if ((cmd->data_direction == DMA_TO_DEVICE) && | |
999 | !(cmd->cmd_flags & ICF_NON_IMMEDIATE_UNSOLICITED_DATA)) { | |
1000 | /* | |
1001 | * Send the delayed TASK_ABORTED status for WRITEs if | |
1002 | * no more nsolicitied data is expected. | |
1003 | */ | |
1004 | if (transport_check_aborted_status(se_cmd, 1) != 0) | |
1005 | return 0; | |
1006 | ||
3e1c81a9 | 1007 | iscsit_set_unsoliticed_dataout(cmd); |
e48354ce NB |
1008 | } |
1009 | return transport_handle_cdb_direct(&cmd->se_cmd); | |
1010 | ||
1011 | case ISCSI_OP_NOOP_OUT: | |
1012 | case ISCSI_OP_TEXT: | |
1013 | spin_unlock_bh(&cmd->istate_lock); | |
1014 | iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state); | |
1015 | break; | |
1016 | case ISCSI_OP_SCSI_TMFUNC: | |
de103c93 | 1017 | if (cmd->se_cmd.se_tmr_req->response) { |
e48354ce NB |
1018 | spin_unlock_bh(&cmd->istate_lock); |
1019 | iscsit_add_cmd_to_response_queue(cmd, cmd->conn, | |
1020 | cmd->i_state); | |
1021 | return 0; | |
1022 | } | |
1023 | spin_unlock_bh(&cmd->istate_lock); | |
1024 | ||
1025 | return transport_generic_handle_tmr(&cmd->se_cmd); | |
1026 | case ISCSI_OP_LOGOUT: | |
1027 | spin_unlock_bh(&cmd->istate_lock); | |
1028 | switch (cmd->logout_reason) { | |
1029 | case ISCSI_LOGOUT_REASON_CLOSE_SESSION: | |
1030 | lr = iscsit_logout_closesession(cmd, cmd->conn); | |
1031 | break; | |
1032 | case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: | |
1033 | lr = iscsit_logout_closeconnection(cmd, cmd->conn); | |
1034 | break; | |
1035 | case ISCSI_LOGOUT_REASON_RECOVERY: | |
1036 | lr = iscsit_logout_removeconnforrecovery(cmd, cmd->conn); | |
1037 | break; | |
1038 | default: | |
1039 | pr_err("Unknown iSCSI Logout Request Code:" | |
1040 | " 0x%02x\n", cmd->logout_reason); | |
1041 | return -1; | |
1042 | } | |
1043 | ||
1044 | return lr; | |
1045 | default: | |
1046 | spin_unlock_bh(&cmd->istate_lock); | |
1047 | pr_err("Cannot perform out of order execution for" | |
1048 | " unknown iSCSI Opcode: 0x%02x\n", cmd->iscsi_opcode); | |
1049 | return -1; | |
1050 | } | |
1051 | ||
1052 | return 0; | |
1053 | } | |
1054 | ||
1055 | void iscsit_free_all_ooo_cmdsns(struct iscsi_session *sess) | |
1056 | { | |
1057 | struct iscsi_ooo_cmdsn *ooo_cmdsn, *ooo_cmdsn_tmp; | |
1058 | ||
1059 | mutex_lock(&sess->cmdsn_mutex); | |
1060 | list_for_each_entry_safe(ooo_cmdsn, ooo_cmdsn_tmp, | |
1061 | &sess->sess_ooo_cmdsn_list, ooo_list) { | |
1062 | ||
1063 | list_del(&ooo_cmdsn->ooo_list); | |
1064 | kmem_cache_free(lio_ooo_cache, ooo_cmdsn); | |
1065 | } | |
1066 | mutex_unlock(&sess->cmdsn_mutex); | |
1067 | } | |
1068 | ||
1069 | int iscsit_handle_ooo_cmdsn( | |
1070 | struct iscsi_session *sess, | |
1071 | struct iscsi_cmd *cmd, | |
1072 | u32 cmdsn) | |
1073 | { | |
1074 | int batch = 0; | |
1075 | struct iscsi_ooo_cmdsn *ooo_cmdsn = NULL, *ooo_tail = NULL; | |
1076 | ||
1077 | cmd->deferred_i_state = cmd->i_state; | |
1078 | cmd->i_state = ISTATE_DEFERRED_CMD; | |
1079 | cmd->cmd_flags |= ICF_OOO_CMDSN; | |
1080 | ||
1081 | if (list_empty(&sess->sess_ooo_cmdsn_list)) | |
1082 | batch = 1; | |
1083 | else { | |
1084 | ooo_tail = list_entry(sess->sess_ooo_cmdsn_list.prev, | |
1085 | typeof(*ooo_tail), ooo_list); | |
1086 | if (ooo_tail->cmdsn != (cmdsn - 1)) | |
1087 | batch = 1; | |
1088 | } | |
1089 | ||
1090 | ooo_cmdsn = iscsit_allocate_ooo_cmdsn(); | |
1091 | if (!ooo_cmdsn) | |
1092 | return CMDSN_ERROR_CANNOT_RECOVER; | |
1093 | ||
1094 | ooo_cmdsn->cmd = cmd; | |
1095 | ooo_cmdsn->batch_count = (batch) ? | |
1096 | (cmdsn - sess->exp_cmd_sn) : 1; | |
1097 | ooo_cmdsn->cid = cmd->conn->cid; | |
1098 | ooo_cmdsn->exp_cmdsn = sess->exp_cmd_sn; | |
1099 | ooo_cmdsn->cmdsn = cmdsn; | |
1100 | ||
1101 | if (iscsit_attach_ooo_cmdsn(sess, ooo_cmdsn) < 0) { | |
1102 | kmem_cache_free(lio_ooo_cache, ooo_cmdsn); | |
1103 | return CMDSN_ERROR_CANNOT_RECOVER; | |
1104 | } | |
1105 | ||
1106 | return CMDSN_HIGHER_THAN_EXP; | |
1107 | } | |
1108 | ||
1109 | static int iscsit_set_dataout_timeout_values( | |
1110 | struct iscsi_cmd *cmd, | |
1111 | u32 *offset, | |
1112 | u32 *length) | |
1113 | { | |
1114 | struct iscsi_conn *conn = cmd->conn; | |
1115 | struct iscsi_r2t *r2t; | |
1116 | ||
1117 | if (cmd->unsolicited_data) { | |
1118 | *offset = 0; | |
1119 | *length = (conn->sess->sess_ops->FirstBurstLength > | |
ebf1d95c AG |
1120 | cmd->se_cmd.data_length) ? |
1121 | cmd->se_cmd.data_length : | |
e48354ce NB |
1122 | conn->sess->sess_ops->FirstBurstLength; |
1123 | return 0; | |
1124 | } | |
1125 | ||
1126 | spin_lock_bh(&cmd->r2t_lock); | |
1127 | if (list_empty(&cmd->cmd_r2t_list)) { | |
1128 | pr_err("cmd->cmd_r2t_list is empty!\n"); | |
1129 | spin_unlock_bh(&cmd->r2t_lock); | |
1130 | return -1; | |
1131 | } | |
1132 | ||
1133 | list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) { | |
1134 | if (r2t->sent_r2t && !r2t->recovery_r2t && !r2t->seq_complete) { | |
1135 | *offset = r2t->offset; | |
1136 | *length = r2t->xfer_len; | |
1137 | spin_unlock_bh(&cmd->r2t_lock); | |
1138 | return 0; | |
1139 | } | |
1140 | } | |
1141 | spin_unlock_bh(&cmd->r2t_lock); | |
1142 | ||
1143 | pr_err("Unable to locate any incomplete DataOUT" | |
1144 | " sequences for ITT: 0x%08x.\n", cmd->init_task_tag); | |
1145 | ||
1146 | return -1; | |
1147 | } | |
1148 | ||
1149 | /* | |
1150 | * NOTE: Called from interrupt (timer) context. | |
1151 | */ | |
1152 | static void iscsit_handle_dataout_timeout(unsigned long data) | |
1153 | { | |
1154 | u32 pdu_length = 0, pdu_offset = 0; | |
1155 | u32 r2t_length = 0, r2t_offset = 0; | |
1156 | struct iscsi_cmd *cmd = (struct iscsi_cmd *) data; | |
1157 | struct iscsi_conn *conn = cmd->conn; | |
1158 | struct iscsi_session *sess = NULL; | |
1159 | struct iscsi_node_attrib *na; | |
1160 | ||
1161 | iscsit_inc_conn_usage_count(conn); | |
1162 | ||
1163 | spin_lock_bh(&cmd->dataout_timeout_lock); | |
1164 | if (cmd->dataout_timer_flags & ISCSI_TF_STOP) { | |
1165 | spin_unlock_bh(&cmd->dataout_timeout_lock); | |
1166 | iscsit_dec_conn_usage_count(conn); | |
1167 | return; | |
1168 | } | |
1169 | cmd->dataout_timer_flags &= ~ISCSI_TF_RUNNING; | |
1170 | sess = conn->sess; | |
1171 | na = iscsit_tpg_get_node_attrib(sess); | |
1172 | ||
1173 | if (!sess->sess_ops->ErrorRecoveryLevel) { | |
1174 | pr_debug("Unable to recover from DataOut timeout while" | |
1175 | " in ERL=0.\n"); | |
1176 | goto failure; | |
1177 | } | |
1178 | ||
1179 | if (++cmd->dataout_timeout_retries == na->dataout_timeout_retries) { | |
1180 | pr_debug("Command ITT: 0x%08x exceeded max retries" | |
1181 | " for DataOUT timeout %u, closing iSCSI connection.\n", | |
1182 | cmd->init_task_tag, na->dataout_timeout_retries); | |
1183 | goto failure; | |
1184 | } | |
1185 | ||
1186 | cmd->cmd_flags |= ICF_WITHIN_COMMAND_RECOVERY; | |
1187 | ||
1188 | if (conn->sess->sess_ops->DataSequenceInOrder) { | |
1189 | if (conn->sess->sess_ops->DataPDUInOrder) { | |
1190 | pdu_offset = cmd->write_data_done; | |
1191 | if ((pdu_offset + (conn->sess->sess_ops->MaxBurstLength - | |
ebf1d95c AG |
1192 | cmd->next_burst_len)) > cmd->se_cmd.data_length) |
1193 | pdu_length = (cmd->se_cmd.data_length - | |
e48354ce NB |
1194 | cmd->write_data_done); |
1195 | else | |
1196 | pdu_length = (conn->sess->sess_ops->MaxBurstLength - | |
1197 | cmd->next_burst_len); | |
1198 | } else { | |
1199 | pdu_offset = cmd->seq_start_offset; | |
1200 | pdu_length = (cmd->seq_end_offset - | |
1201 | cmd->seq_start_offset); | |
1202 | } | |
1203 | } else { | |
1204 | if (iscsit_set_dataout_timeout_values(cmd, &pdu_offset, | |
1205 | &pdu_length) < 0) | |
1206 | goto failure; | |
1207 | } | |
1208 | ||
1209 | if (iscsit_recalculate_dataout_values(cmd, pdu_offset, pdu_length, | |
1210 | &r2t_offset, &r2t_length) < 0) | |
1211 | goto failure; | |
1212 | ||
1213 | pr_debug("Command ITT: 0x%08x timed out waiting for" | |
1214 | " completion of %sDataOUT Sequence Offset: %u, Length: %u\n", | |
1215 | cmd->init_task_tag, (cmd->unsolicited_data) ? "Unsolicited " : | |
1216 | "", r2t_offset, r2t_length); | |
1217 | ||
1218 | if (iscsit_send_recovery_r2t(cmd, r2t_offset, r2t_length) < 0) | |
1219 | goto failure; | |
1220 | ||
1221 | iscsit_start_dataout_timer(cmd, conn); | |
1222 | spin_unlock_bh(&cmd->dataout_timeout_lock); | |
1223 | iscsit_dec_conn_usage_count(conn); | |
1224 | ||
1225 | return; | |
1226 | ||
1227 | failure: | |
1228 | spin_unlock_bh(&cmd->dataout_timeout_lock); | |
1229 | iscsit_cause_connection_reinstatement(conn, 0); | |
1230 | iscsit_dec_conn_usage_count(conn); | |
1231 | } | |
1232 | ||
1233 | void iscsit_mod_dataout_timer(struct iscsi_cmd *cmd) | |
1234 | { | |
1235 | struct iscsi_conn *conn = cmd->conn; | |
1236 | struct iscsi_session *sess = conn->sess; | |
e8904dc5 | 1237 | struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); |
e48354ce NB |
1238 | |
1239 | spin_lock_bh(&cmd->dataout_timeout_lock); | |
1240 | if (!(cmd->dataout_timer_flags & ISCSI_TF_RUNNING)) { | |
1241 | spin_unlock_bh(&cmd->dataout_timeout_lock); | |
1242 | return; | |
1243 | } | |
1244 | ||
1245 | mod_timer(&cmd->dataout_timer, | |
1246 | (get_jiffies_64() + na->dataout_timeout * HZ)); | |
1247 | pr_debug("Updated DataOUT timer for ITT: 0x%08x", | |
1248 | cmd->init_task_tag); | |
1249 | spin_unlock_bh(&cmd->dataout_timeout_lock); | |
1250 | } | |
1251 | ||
1252 | /* | |
1253 | * Called with cmd->dataout_timeout_lock held. | |
1254 | */ | |
1255 | void iscsit_start_dataout_timer( | |
1256 | struct iscsi_cmd *cmd, | |
1257 | struct iscsi_conn *conn) | |
1258 | { | |
1259 | struct iscsi_session *sess = conn->sess; | |
e8904dc5 | 1260 | struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); |
e48354ce NB |
1261 | |
1262 | if (cmd->dataout_timer_flags & ISCSI_TF_RUNNING) | |
1263 | return; | |
1264 | ||
1265 | pr_debug("Starting DataOUT timer for ITT: 0x%08x on" | |
1266 | " CID: %hu.\n", cmd->init_task_tag, conn->cid); | |
1267 | ||
1268 | init_timer(&cmd->dataout_timer); | |
1269 | cmd->dataout_timer.expires = (get_jiffies_64() + na->dataout_timeout * HZ); | |
1270 | cmd->dataout_timer.data = (unsigned long)cmd; | |
1271 | cmd->dataout_timer.function = iscsit_handle_dataout_timeout; | |
1272 | cmd->dataout_timer_flags &= ~ISCSI_TF_STOP; | |
1273 | cmd->dataout_timer_flags |= ISCSI_TF_RUNNING; | |
1274 | add_timer(&cmd->dataout_timer); | |
1275 | } | |
1276 | ||
1277 | void iscsit_stop_dataout_timer(struct iscsi_cmd *cmd) | |
1278 | { | |
1279 | spin_lock_bh(&cmd->dataout_timeout_lock); | |
1280 | if (!(cmd->dataout_timer_flags & ISCSI_TF_RUNNING)) { | |
1281 | spin_unlock_bh(&cmd->dataout_timeout_lock); | |
1282 | return; | |
1283 | } | |
1284 | cmd->dataout_timer_flags |= ISCSI_TF_STOP; | |
1285 | spin_unlock_bh(&cmd->dataout_timeout_lock); | |
1286 | ||
1287 | del_timer_sync(&cmd->dataout_timer); | |
1288 | ||
1289 | spin_lock_bh(&cmd->dataout_timeout_lock); | |
1290 | cmd->dataout_timer_flags &= ~ISCSI_TF_RUNNING; | |
1291 | pr_debug("Stopped DataOUT Timer for ITT: 0x%08x\n", | |
1292 | cmd->init_task_tag); | |
1293 | spin_unlock_bh(&cmd->dataout_timeout_lock); | |
1294 | } | |
3e1c81a9 | 1295 | EXPORT_SYMBOL(iscsit_stop_dataout_timer); |