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e48354ce NB |
1 | /******************************************************************************* |
2 | * This file contains error recovery level one used by the iSCSI Target driver. | |
3 | * | |
4c76251e | 4 | * (c) Copyright 2007-2013 Datera, Inc. |
e48354ce NB |
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> | |
8dcf07be | 20 | #include <linux/slab.h> |
e48354ce NB |
21 | #include <scsi/iscsi_proto.h> |
22 | #include <target/target_core_base.h> | |
c4795fb2 | 23 | #include <target/target_core_fabric.h> |
3e1c81a9 | 24 | #include <target/iscsi/iscsi_transport.h> |
e48354ce | 25 | |
67f091f2 | 26 | #include <target/iscsi/iscsi_target_core.h> |
e48354ce NB |
27 | #include "iscsi_target_seq_pdu_list.h" |
28 | #include "iscsi_target_datain_values.h" | |
29 | #include "iscsi_target_device.h" | |
30 | #include "iscsi_target_tpg.h" | |
31 | #include "iscsi_target_util.h" | |
32 | #include "iscsi_target_erl0.h" | |
33 | #include "iscsi_target_erl1.h" | |
34 | #include "iscsi_target_erl2.h" | |
35 | #include "iscsi_target.h" | |
36 | ||
37 | #define OFFLOAD_BUF_SIZE 32768 | |
38 | ||
39 | /* | |
40 | * Used to dump excess datain payload for certain error recovery | |
41 | * situations. Receive in OFFLOAD_BUF_SIZE max of datain per rx_data(). | |
42 | * | |
43 | * dump_padding_digest denotes if padding and data digests need | |
44 | * to be dumped. | |
45 | */ | |
46 | int iscsit_dump_data_payload( | |
47 | struct iscsi_conn *conn, | |
48 | u32 buf_len, | |
49 | int dump_padding_digest) | |
50 | { | |
51 | char *buf, pad_bytes[4]; | |
52 | int ret = DATAOUT_WITHIN_COMMAND_RECOVERY, rx_got; | |
53 | u32 length, padding, offset = 0, size; | |
54 | struct kvec iov; | |
55 | ||
3e1c81a9 NB |
56 | if (conn->sess->sess_ops->RDMAExtensions) |
57 | return 0; | |
58 | ||
e48354ce NB |
59 | length = (buf_len > OFFLOAD_BUF_SIZE) ? OFFLOAD_BUF_SIZE : buf_len; |
60 | ||
61 | buf = kzalloc(length, GFP_ATOMIC); | |
62 | if (!buf) { | |
63 | pr_err("Unable to allocate %u bytes for offload" | |
64 | " buffer.\n", length); | |
65 | return -1; | |
66 | } | |
67 | memset(&iov, 0, sizeof(struct kvec)); | |
68 | ||
69 | while (offset < buf_len) { | |
70 | size = ((offset + length) > buf_len) ? | |
71 | (buf_len - offset) : length; | |
72 | ||
73 | iov.iov_len = size; | |
74 | iov.iov_base = buf; | |
75 | ||
76 | rx_got = rx_data(conn, &iov, 1, size); | |
77 | if (rx_got != size) { | |
78 | ret = DATAOUT_CANNOT_RECOVER; | |
79 | goto out; | |
80 | } | |
81 | ||
82 | offset += size; | |
83 | } | |
84 | ||
85 | if (!dump_padding_digest) | |
86 | goto out; | |
87 | ||
88 | padding = ((-buf_len) & 3); | |
89 | if (padding != 0) { | |
90 | iov.iov_len = padding; | |
91 | iov.iov_base = pad_bytes; | |
92 | ||
93 | rx_got = rx_data(conn, &iov, 1, padding); | |
94 | if (rx_got != padding) { | |
95 | ret = DATAOUT_CANNOT_RECOVER; | |
96 | goto out; | |
97 | } | |
98 | } | |
99 | ||
100 | if (conn->conn_ops->DataDigest) { | |
101 | u32 data_crc; | |
102 | ||
103 | iov.iov_len = ISCSI_CRC_LEN; | |
104 | iov.iov_base = &data_crc; | |
105 | ||
106 | rx_got = rx_data(conn, &iov, 1, ISCSI_CRC_LEN); | |
107 | if (rx_got != ISCSI_CRC_LEN) { | |
108 | ret = DATAOUT_CANNOT_RECOVER; | |
109 | goto out; | |
110 | } | |
111 | } | |
112 | ||
113 | out: | |
114 | kfree(buf); | |
115 | return ret; | |
116 | } | |
117 | ||
118 | /* | |
119 | * Used for retransmitting R2Ts from a R2T SNACK request. | |
120 | */ | |
121 | static int iscsit_send_recovery_r2t_for_snack( | |
122 | struct iscsi_cmd *cmd, | |
123 | struct iscsi_r2t *r2t) | |
124 | { | |
125 | /* | |
126 | * If the struct iscsi_r2t has not been sent yet, we can safely | |
127 | * ignore retransmission | |
128 | * of the R2TSN in question. | |
129 | */ | |
130 | spin_lock_bh(&cmd->r2t_lock); | |
131 | if (!r2t->sent_r2t) { | |
132 | spin_unlock_bh(&cmd->r2t_lock); | |
133 | return 0; | |
134 | } | |
135 | r2t->sent_r2t = 0; | |
136 | spin_unlock_bh(&cmd->r2t_lock); | |
137 | ||
138 | iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, ISTATE_SEND_R2T); | |
139 | ||
140 | return 0; | |
141 | } | |
142 | ||
143 | static int iscsit_handle_r2t_snack( | |
144 | struct iscsi_cmd *cmd, | |
145 | unsigned char *buf, | |
146 | u32 begrun, | |
147 | u32 runlength) | |
148 | { | |
149 | u32 last_r2tsn; | |
150 | struct iscsi_r2t *r2t; | |
151 | ||
152 | /* | |
153 | * Make sure the initiator is not requesting retransmission | |
154 | * of R2TSNs already acknowledged by a TMR TASK_REASSIGN. | |
155 | */ | |
156 | if ((cmd->cmd_flags & ICF_GOT_DATACK_SNACK) && | |
157 | (begrun <= cmd->acked_data_sn)) { | |
158 | pr_err("ITT: 0x%08x, R2T SNACK requesting" | |
159 | " retransmission of R2TSN: 0x%08x to 0x%08x but already" | |
160 | " acked to R2TSN: 0x%08x by TMR TASK_REASSIGN," | |
161 | " protocol error.\n", cmd->init_task_tag, begrun, | |
162 | (begrun + runlength), cmd->acked_data_sn); | |
163 | ||
5a342521 | 164 | return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf); |
e48354ce NB |
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); | |
ba159914 NB |
173 | return iscsit_reject_cmd(cmd, |
174 | ISCSI_REASON_BOOKMARK_INVALID, buf); | |
e48354ce NB |
175 | } |
176 | last_r2tsn = (begrun + runlength); | |
177 | } else | |
178 | last_r2tsn = cmd->r2t_sn; | |
179 | ||
180 | while (begrun < last_r2tsn) { | |
181 | r2t = iscsit_get_holder_for_r2tsn(cmd, begrun); | |
182 | if (!r2t) | |
183 | return -1; | |
184 | if (iscsit_send_recovery_r2t_for_snack(cmd, r2t) < 0) | |
185 | return -1; | |
186 | ||
187 | begrun++; | |
188 | } | |
189 | ||
190 | return 0; | |
191 | } | |
192 | ||
193 | /* | |
194 | * Generates Offsets and NextBurstLength based on Begrun and Runlength | |
195 | * carried in a Data SNACK or ExpDataSN in TMR TASK_REASSIGN. | |
196 | * | |
197 | * For DataSequenceInOrder=Yes and DataPDUInOrder=[Yes,No] only. | |
198 | * | |
199 | * FIXME: How is this handled for a RData SNACK? | |
200 | */ | |
201 | int iscsit_create_recovery_datain_values_datasequenceinorder_yes( | |
202 | struct iscsi_cmd *cmd, | |
203 | struct iscsi_datain_req *dr) | |
204 | { | |
205 | u32 data_sn = 0, data_sn_count = 0; | |
206 | u32 pdu_start = 0, seq_no = 0; | |
207 | u32 begrun = dr->begrun; | |
208 | struct iscsi_conn *conn = cmd->conn; | |
209 | ||
210 | while (begrun > data_sn++) { | |
211 | data_sn_count++; | |
212 | if ((dr->next_burst_len + | |
213 | conn->conn_ops->MaxRecvDataSegmentLength) < | |
214 | conn->sess->sess_ops->MaxBurstLength) { | |
215 | dr->read_data_done += | |
216 | conn->conn_ops->MaxRecvDataSegmentLength; | |
217 | dr->next_burst_len += | |
218 | conn->conn_ops->MaxRecvDataSegmentLength; | |
219 | } else { | |
220 | dr->read_data_done += | |
221 | (conn->sess->sess_ops->MaxBurstLength - | |
222 | dr->next_burst_len); | |
223 | dr->next_burst_len = 0; | |
224 | pdu_start += data_sn_count; | |
225 | data_sn_count = 0; | |
226 | seq_no++; | |
227 | } | |
228 | } | |
229 | ||
230 | if (!conn->sess->sess_ops->DataPDUInOrder) { | |
231 | cmd->seq_no = seq_no; | |
232 | cmd->pdu_start = pdu_start; | |
233 | cmd->pdu_send_order = data_sn_count; | |
234 | } | |
235 | ||
236 | return 0; | |
237 | } | |
238 | ||
239 | /* | |
240 | * Generates Offsets and NextBurstLength based on Begrun and Runlength | |
241 | * carried in a Data SNACK or ExpDataSN in TMR TASK_REASSIGN. | |
242 | * | |
243 | * For DataSequenceInOrder=No and DataPDUInOrder=[Yes,No] only. | |
244 | * | |
245 | * FIXME: How is this handled for a RData SNACK? | |
246 | */ | |
247 | int iscsit_create_recovery_datain_values_datasequenceinorder_no( | |
248 | struct iscsi_cmd *cmd, | |
249 | struct iscsi_datain_req *dr) | |
250 | { | |
251 | int found_seq = 0, i; | |
252 | u32 data_sn, read_data_done = 0, seq_send_order = 0; | |
253 | u32 begrun = dr->begrun; | |
254 | u32 runlength = dr->runlength; | |
255 | struct iscsi_conn *conn = cmd->conn; | |
256 | struct iscsi_seq *first_seq = NULL, *seq = NULL; | |
257 | ||
258 | if (!cmd->seq_list) { | |
259 | pr_err("struct iscsi_cmd->seq_list is NULL!\n"); | |
260 | return -1; | |
261 | } | |
262 | ||
263 | /* | |
264 | * Calculate read_data_done for all sequences containing a | |
265 | * first_datasn and last_datasn less than the BegRun. | |
266 | * | |
267 | * Locate the struct iscsi_seq the BegRun lies within and calculate | |
268 | * NextBurstLenghth up to the DataSN based on MaxRecvDataSegmentLength. | |
269 | * | |
270 | * Also use struct iscsi_seq->seq_send_order to determine where to start. | |
271 | */ | |
272 | for (i = 0; i < cmd->seq_count; i++) { | |
273 | seq = &cmd->seq_list[i]; | |
274 | ||
275 | if (!seq->seq_send_order) | |
276 | first_seq = seq; | |
277 | ||
278 | /* | |
279 | * No data has been transferred for this DataIN sequence, so the | |
280 | * seq->first_datasn and seq->last_datasn have not been set. | |
281 | */ | |
282 | if (!seq->sent) { | |
e48354ce NB |
283 | pr_err("Ignoring non-sent sequence 0x%08x ->" |
284 | " 0x%08x\n\n", seq->first_datasn, | |
285 | seq->last_datasn); | |
e48354ce NB |
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)) { | |
e48354ce NB |
296 | pr_err("Pre BegRun sequence 0x%08x ->" |
297 | " 0x%08x\n", seq->first_datasn, | |
298 | seq->last_datasn); | |
8b1e1244 | 299 | |
e48354ce NB |
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)) { | |
e48354ce NB |
310 | pr_err("Found sequence begrun: 0x%08x in" |
311 | " 0x%08x -> 0x%08x\n", begrun, | |
312 | seq->first_datasn, seq->last_datasn); | |
8b1e1244 | 313 | |
e48354ce NB |
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)) { | |
e48354ce NB |
369 | pr_err("Post BegRun sequence 0x%08x -> 0x%08x\n", |
370 | seq->first_datasn, seq->last_datasn); | |
8b1e1244 | 371 | |
e48354ce NB |
372 | seq->next_burst_len = seq->pdu_send_order = 0; |
373 | continue; | |
374 | } | |
375 | } | |
376 | ||
377 | if (!found_seq) { | |
378 | if (!begrun) { | |
379 | if (!first_seq) { | |
380 | pr_err("ITT: 0x%08x, Begrun: 0x%08x" | |
381 | " but first_seq is NULL\n", | |
382 | cmd->init_task_tag, begrun); | |
383 | return -1; | |
384 | } | |
385 | seq_send_order = first_seq->seq_send_order; | |
386 | seq->next_burst_len = seq->pdu_send_order = 0; | |
387 | goto done; | |
388 | } | |
389 | ||
390 | pr_err("Unable to locate struct iscsi_seq for ITT: 0x%08x," | |
391 | " BegRun: 0x%08x, RunLength: 0x%08x while" | |
392 | " DataSequenceInOrder=No and DataPDUInOrder=%s.\n", | |
393 | cmd->init_task_tag, begrun, runlength, | |
394 | (conn->sess->sess_ops->DataPDUInOrder) ? "Yes" : "No"); | |
395 | return -1; | |
396 | } | |
397 | ||
398 | done: | |
399 | dr->read_data_done = read_data_done; | |
400 | dr->seq_send_order = seq_send_order; | |
401 | ||
402 | return 0; | |
403 | } | |
404 | ||
405 | static int iscsit_handle_recovery_datain( | |
406 | struct iscsi_cmd *cmd, | |
407 | unsigned char *buf, | |
408 | u32 begrun, | |
409 | u32 runlength) | |
410 | { | |
411 | struct iscsi_conn *conn = cmd->conn; | |
412 | struct iscsi_datain_req *dr; | |
413 | struct se_cmd *se_cmd = &cmd->se_cmd; | |
414 | ||
7d680f3b | 415 | if (!(se_cmd->transport_state & CMD_T_COMPLETE)) { |
e48354ce NB |
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 | ||
ba159914 | 433 | return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf); |
e48354ce NB |
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)); | |
ba159914 NB |
444 | return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, |
445 | buf); | |
e48354ce NB |
446 | } |
447 | ||
448 | dr = iscsit_allocate_datain_req(); | |
449 | if (!dr) | |
ba159914 NB |
450 | return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_NO_RESOURCES, |
451 | buf); | |
e48354ce NB |
452 | |
453 | dr->data_sn = dr->begrun = begrun; | |
454 | dr->runlength = runlength; | |
455 | dr->generate_recovery_values = 1; | |
456 | dr->recovery = DATAIN_WITHIN_COMMAND_RECOVERY; | |
457 | ||
458 | iscsit_attach_datain_req(cmd, dr); | |
459 | ||
460 | cmd->i_state = ISTATE_SEND_DATAIN; | |
461 | iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); | |
462 | ||
463 | return 0; | |
464 | } | |
465 | ||
466 | int iscsit_handle_recovery_datain_or_r2t( | |
467 | struct iscsi_conn *conn, | |
468 | unsigned char *buf, | |
66c7db68 | 469 | itt_t init_task_tag, |
e48354ce NB |
470 | u32 targ_xfer_tag, |
471 | u32 begrun, | |
472 | u32 runlength) | |
473 | { | |
474 | struct iscsi_cmd *cmd; | |
475 | ||
476 | cmd = iscsit_find_cmd_from_itt(conn, init_task_tag); | |
477 | if (!cmd) | |
478 | return 0; | |
479 | ||
480 | /* | |
481 | * FIXME: This will not work for bidi commands. | |
482 | */ | |
483 | switch (cmd->data_direction) { | |
484 | case DMA_TO_DEVICE: | |
485 | return iscsit_handle_r2t_snack(cmd, buf, begrun, runlength); | |
486 | case DMA_FROM_DEVICE: | |
487 | return iscsit_handle_recovery_datain(cmd, buf, begrun, | |
488 | runlength); | |
489 | default: | |
490 | pr_err("Unknown cmd->data_direction: 0x%02x\n", | |
491 | cmd->data_direction); | |
492 | return -1; | |
493 | } | |
494 | ||
495 | return 0; | |
496 | } | |
497 | ||
498 | /* #warning FIXME: Status SNACK needs to be dependent on OPCODE!!! */ | |
499 | int iscsit_handle_status_snack( | |
500 | struct iscsi_conn *conn, | |
66c7db68 | 501 | itt_t init_task_tag, |
e48354ce NB |
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 | ||
752d8680 NB |
510 | if (!begrun) { |
511 | begrun = conn->exp_statsn; | |
512 | } else if (conn->exp_statsn > begrun) { | |
e48354ce NB |
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); | |
2fbb471e | 526 | list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { |
e48354ce NB |
527 | if (cmd->stat_sn == begrun) { |
528 | found_cmd = 1; | |
529 | break; | |
530 | } | |
531 | } | |
532 | spin_unlock_bh(&conn->cmd_lock); | |
533 | ||
534 | if (!found_cmd) { | |
535 | pr_err("Unable to find StatSN: 0x%08x for" | |
536 | " a Status SNACK, assuming this was a" | |
537 | " protactic SNACK for an untransmitted" | |
538 | " StatSN, ignoring.\n", begrun); | |
539 | begrun++; | |
540 | continue; | |
541 | } | |
542 | ||
543 | spin_lock_bh(&cmd->istate_lock); | |
544 | if (cmd->i_state == ISTATE_SEND_DATAIN) { | |
545 | spin_unlock_bh(&cmd->istate_lock); | |
546 | pr_err("Ignoring Status SNACK for BegRun:" | |
547 | " 0x%08x, RunLength: 0x%08x, assuming this was" | |
548 | " a protactic SNACK for an untransmitted" | |
549 | " StatSN\n", begrun, runlength); | |
550 | begrun++; | |
551 | continue; | |
552 | } | |
553 | spin_unlock_bh(&cmd->istate_lock); | |
554 | ||
555 | cmd->i_state = ISTATE_SEND_STATUS_RECOVERY; | |
556 | iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state); | |
557 | begrun++; | |
558 | } | |
559 | ||
560 | return 0; | |
561 | } | |
562 | ||
563 | int iscsit_handle_data_ack( | |
564 | struct iscsi_conn *conn, | |
565 | u32 targ_xfer_tag, | |
566 | u32 begrun, | |
567 | u32 runlength) | |
568 | { | |
569 | struct iscsi_cmd *cmd = NULL; | |
570 | ||
571 | cmd = iscsit_find_cmd_from_ttt(conn, targ_xfer_tag); | |
572 | if (!cmd) { | |
573 | pr_err("Data ACK SNACK for TTT: 0x%08x is" | |
574 | " invalid.\n", targ_xfer_tag); | |
575 | return -1; | |
576 | } | |
577 | ||
578 | if (begrun <= cmd->acked_data_sn) { | |
579 | pr_err("ITT: 0x%08x Data ACK SNACK BegRUN: 0x%08x is" | |
580 | " less than the already acked DataSN: 0x%08x.\n", | |
581 | cmd->init_task_tag, begrun, cmd->acked_data_sn); | |
582 | return -1; | |
583 | } | |
584 | ||
585 | /* | |
586 | * For Data ACK SNACK, BegRun is the next expected DataSN. | |
587 | * (see iSCSI v19: 10.16.6) | |
588 | */ | |
589 | cmd->cmd_flags |= ICF_GOT_DATACK_SNACK; | |
590 | cmd->acked_data_sn = (begrun - 1); | |
591 | ||
592 | pr_debug("Received Data ACK SNACK for ITT: 0x%08x," | |
593 | " updated acked DataSN to 0x%08x.\n", | |
594 | cmd->init_task_tag, cmd->acked_data_sn); | |
595 | ||
596 | return 0; | |
597 | } | |
598 | ||
599 | static int iscsit_send_recovery_r2t( | |
600 | struct iscsi_cmd *cmd, | |
601 | u32 offset, | |
602 | u32 xfer_len) | |
603 | { | |
604 | int ret; | |
605 | ||
606 | spin_lock_bh(&cmd->r2t_lock); | |
607 | ret = iscsit_add_r2t_to_list(cmd, offset, xfer_len, 1, 0); | |
608 | spin_unlock_bh(&cmd->r2t_lock); | |
609 | ||
610 | return ret; | |
611 | } | |
612 | ||
613 | int iscsit_dataout_datapduinorder_no_fbit( | |
614 | struct iscsi_cmd *cmd, | |
615 | struct iscsi_pdu *pdu) | |
616 | { | |
617 | int i, send_recovery_r2t = 0, recovery = 0; | |
618 | u32 length = 0, offset = 0, pdu_count = 0, xfer_len = 0; | |
619 | struct iscsi_conn *conn = cmd->conn; | |
620 | struct iscsi_pdu *first_pdu = NULL; | |
621 | ||
622 | /* | |
623 | * Get an struct iscsi_pdu pointer to the first PDU, and total PDU count | |
624 | * of the DataOUT sequence. | |
625 | */ | |
626 | if (conn->sess->sess_ops->DataSequenceInOrder) { | |
627 | for (i = 0; i < cmd->pdu_count; i++) { | |
628 | if (cmd->pdu_list[i].seq_no == pdu->seq_no) { | |
629 | if (!first_pdu) | |
630 | first_pdu = &cmd->pdu_list[i]; | |
5a342521 BVA |
631 | xfer_len += cmd->pdu_list[i].length; |
632 | pdu_count++; | |
e48354ce NB |
633 | } else if (pdu_count) |
634 | break; | |
635 | } | |
636 | } else { | |
637 | struct iscsi_seq *seq = cmd->seq_ptr; | |
638 | ||
639 | first_pdu = &cmd->pdu_list[seq->pdu_start]; | |
640 | pdu_count = seq->pdu_count; | |
641 | } | |
642 | ||
643 | if (!first_pdu || !pdu_count) | |
644 | return DATAOUT_CANNOT_RECOVER; | |
645 | ||
646 | /* | |
647 | * Loop through the ending DataOUT Sequence checking each struct iscsi_pdu. | |
648 | * The following ugly logic does batching of not received PDUs. | |
649 | */ | |
650 | for (i = 0; i < pdu_count; i++) { | |
651 | if (first_pdu[i].status == ISCSI_PDU_RECEIVED_OK) { | |
652 | if (!send_recovery_r2t) | |
653 | continue; | |
654 | ||
655 | if (iscsit_send_recovery_r2t(cmd, offset, length) < 0) | |
656 | return DATAOUT_CANNOT_RECOVER; | |
657 | ||
658 | send_recovery_r2t = length = offset = 0; | |
659 | continue; | |
660 | } | |
661 | /* | |
662 | * Set recovery = 1 for any missing, CRC failed, or timed | |
663 | * out PDUs to let the DataOUT logic know that this sequence | |
664 | * has not been completed yet. | |
665 | * | |
666 | * Also, only send a Recovery R2T for ISCSI_PDU_NOT_RECEIVED. | |
667 | * We assume if the PDU either failed CRC or timed out | |
668 | * that a Recovery R2T has already been sent. | |
669 | */ | |
670 | recovery = 1; | |
671 | ||
672 | if (first_pdu[i].status != ISCSI_PDU_NOT_RECEIVED) | |
673 | continue; | |
674 | ||
675 | if (!offset) | |
676 | offset = first_pdu[i].offset; | |
677 | length += first_pdu[i].length; | |
678 | ||
679 | send_recovery_r2t = 1; | |
680 | } | |
681 | ||
682 | if (send_recovery_r2t) | |
683 | if (iscsit_send_recovery_r2t(cmd, offset, length) < 0) | |
684 | return DATAOUT_CANNOT_RECOVER; | |
685 | ||
686 | return (!recovery) ? DATAOUT_NORMAL : DATAOUT_WITHIN_COMMAND_RECOVERY; | |
687 | } | |
688 | ||
689 | static int iscsit_recalculate_dataout_values( | |
690 | struct iscsi_cmd *cmd, | |
691 | u32 pdu_offset, | |
692 | u32 pdu_length, | |
693 | u32 *r2t_offset, | |
694 | u32 *r2t_length) | |
695 | { | |
696 | int i; | |
697 | struct iscsi_conn *conn = cmd->conn; | |
698 | struct iscsi_pdu *pdu = NULL; | |
699 | ||
700 | if (conn->sess->sess_ops->DataSequenceInOrder) { | |
701 | cmd->data_sn = 0; | |
702 | ||
703 | if (conn->sess->sess_ops->DataPDUInOrder) { | |
704 | *r2t_offset = cmd->write_data_done; | |
705 | *r2t_length = (cmd->seq_end_offset - | |
706 | cmd->write_data_done); | |
707 | return 0; | |
708 | } | |
709 | ||
710 | *r2t_offset = cmd->seq_start_offset; | |
711 | *r2t_length = (cmd->seq_end_offset - cmd->seq_start_offset); | |
712 | ||
713 | for (i = 0; i < cmd->pdu_count; i++) { | |
714 | pdu = &cmd->pdu_list[i]; | |
715 | ||
716 | if (pdu->status != ISCSI_PDU_RECEIVED_OK) | |
717 | continue; | |
718 | ||
719 | if ((pdu->offset >= cmd->seq_start_offset) && | |
720 | ((pdu->offset + pdu->length) <= | |
721 | cmd->seq_end_offset)) { | |
722 | if (!cmd->unsolicited_data) | |
723 | cmd->next_burst_len -= pdu->length; | |
724 | else | |
725 | cmd->first_burst_len -= pdu->length; | |
726 | ||
727 | cmd->write_data_done -= pdu->length; | |
728 | pdu->status = ISCSI_PDU_NOT_RECEIVED; | |
729 | } | |
730 | } | |
731 | } else { | |
732 | struct iscsi_seq *seq = NULL; | |
733 | ||
734 | seq = iscsit_get_seq_holder(cmd, pdu_offset, pdu_length); | |
735 | if (!seq) | |
736 | return -1; | |
737 | ||
738 | *r2t_offset = seq->orig_offset; | |
739 | *r2t_length = seq->xfer_len; | |
740 | ||
741 | cmd->write_data_done -= (seq->offset - seq->orig_offset); | |
742 | if (cmd->immediate_data) | |
743 | cmd->first_burst_len = cmd->write_data_done; | |
744 | ||
745 | seq->data_sn = 0; | |
746 | seq->offset = seq->orig_offset; | |
747 | seq->next_burst_len = 0; | |
748 | seq->status = DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY; | |
749 | ||
750 | if (conn->sess->sess_ops->DataPDUInOrder) | |
751 | return 0; | |
752 | ||
753 | for (i = 0; i < seq->pdu_count; i++) { | |
754 | pdu = &cmd->pdu_list[i+seq->pdu_start]; | |
755 | ||
756 | if (pdu->status != ISCSI_PDU_RECEIVED_OK) | |
757 | continue; | |
758 | ||
759 | pdu->status = ISCSI_PDU_NOT_RECEIVED; | |
760 | } | |
761 | } | |
762 | ||
763 | return 0; | |
764 | } | |
765 | ||
766 | int iscsit_recover_dataout_sequence( | |
767 | struct iscsi_cmd *cmd, | |
768 | u32 pdu_offset, | |
769 | u32 pdu_length) | |
770 | { | |
771 | u32 r2t_length = 0, r2t_offset = 0; | |
772 | ||
773 | spin_lock_bh(&cmd->istate_lock); | |
774 | cmd->cmd_flags |= ICF_WITHIN_COMMAND_RECOVERY; | |
775 | spin_unlock_bh(&cmd->istate_lock); | |
776 | ||
777 | if (iscsit_recalculate_dataout_values(cmd, pdu_offset, pdu_length, | |
778 | &r2t_offset, &r2t_length) < 0) | |
779 | return DATAOUT_CANNOT_RECOVER; | |
780 | ||
781 | iscsit_send_recovery_r2t(cmd, r2t_offset, r2t_length); | |
782 | ||
783 | return DATAOUT_WITHIN_COMMAND_RECOVERY; | |
784 | } | |
785 | ||
786 | static struct iscsi_ooo_cmdsn *iscsit_allocate_ooo_cmdsn(void) | |
787 | { | |
788 | struct iscsi_ooo_cmdsn *ooo_cmdsn = NULL; | |
789 | ||
790 | ooo_cmdsn = kmem_cache_zalloc(lio_ooo_cache, GFP_ATOMIC); | |
791 | if (!ooo_cmdsn) { | |
792 | pr_err("Unable to allocate memory for" | |
793 | " struct iscsi_ooo_cmdsn.\n"); | |
794 | return NULL; | |
795 | } | |
796 | INIT_LIST_HEAD(&ooo_cmdsn->ooo_list); | |
797 | ||
798 | return ooo_cmdsn; | |
799 | } | |
800 | ||
801 | /* | |
802 | * Called with sess->cmdsn_mutex held. | |
803 | */ | |
804 | static int iscsit_attach_ooo_cmdsn( | |
805 | struct iscsi_session *sess, | |
806 | struct iscsi_ooo_cmdsn *ooo_cmdsn) | |
807 | { | |
808 | struct iscsi_ooo_cmdsn *ooo_tail, *ooo_tmp; | |
809 | /* | |
810 | * We attach the struct iscsi_ooo_cmdsn entry to the out of order | |
811 | * list in increasing CmdSN order. | |
812 | * This allows iscsi_execute_ooo_cmdsns() to detect any | |
813 | * additional CmdSN holes while performing delayed execution. | |
814 | */ | |
815 | if (list_empty(&sess->sess_ooo_cmdsn_list)) | |
816 | list_add_tail(&ooo_cmdsn->ooo_list, | |
817 | &sess->sess_ooo_cmdsn_list); | |
818 | else { | |
819 | ooo_tail = list_entry(sess->sess_ooo_cmdsn_list.prev, | |
820 | typeof(*ooo_tail), ooo_list); | |
821 | /* | |
822 | * CmdSN is greater than the tail of the list. | |
823 | */ | |
3eccfdb0 | 824 | if (iscsi_sna_lt(ooo_tail->cmdsn, ooo_cmdsn->cmdsn)) |
e48354ce NB |
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) { | |
3eccfdb0 | 834 | if (iscsi_sna_lt(ooo_tmp->cmdsn, ooo_cmdsn->cmdsn)) |
e48354ce NB |
835 | continue; |
836 | ||
3eccfdb0 | 837 | /* Insert before this entry */ |
e48354ce | 838 | list_add(&ooo_cmdsn->ooo_list, |
3eccfdb0 | 839 | ooo_tmp->ooo_list.prev); |
e48354ce NB |
840 | break; |
841 | } | |
842 | } | |
843 | } | |
844 | ||
845 | return 0; | |
846 | } | |
847 | ||
848 | /* | |
849 | * Removes an struct iscsi_ooo_cmdsn from a session's list, | |
850 | * called with struct iscsi_session->cmdsn_mutex held. | |
851 | */ | |
852 | void iscsit_remove_ooo_cmdsn( | |
853 | struct iscsi_session *sess, | |
854 | struct iscsi_ooo_cmdsn *ooo_cmdsn) | |
855 | { | |
856 | list_del(&ooo_cmdsn->ooo_list); | |
857 | kmem_cache_free(lio_ooo_cache, ooo_cmdsn); | |
858 | } | |
859 | ||
860 | void iscsit_clear_ooo_cmdsns_for_conn(struct iscsi_conn *conn) | |
861 | { | |
862 | struct iscsi_ooo_cmdsn *ooo_cmdsn; | |
863 | struct iscsi_session *sess = conn->sess; | |
864 | ||
865 | mutex_lock(&sess->cmdsn_mutex); | |
866 | list_for_each_entry(ooo_cmdsn, &sess->sess_ooo_cmdsn_list, ooo_list) { | |
867 | if (ooo_cmdsn->cid != conn->cid) | |
868 | continue; | |
869 | ||
870 | ooo_cmdsn->cmd = NULL; | |
871 | } | |
872 | mutex_unlock(&sess->cmdsn_mutex); | |
873 | } | |
874 | ||
875 | /* | |
876 | * Called with sess->cmdsn_mutex held. | |
877 | */ | |
878 | int iscsit_execute_ooo_cmdsns(struct iscsi_session *sess) | |
879 | { | |
880 | int ooo_count = 0; | |
881 | struct iscsi_cmd *cmd = NULL; | |
882 | struct iscsi_ooo_cmdsn *ooo_cmdsn, *ooo_cmdsn_tmp; | |
883 | ||
884 | list_for_each_entry_safe(ooo_cmdsn, ooo_cmdsn_tmp, | |
885 | &sess->sess_ooo_cmdsn_list, ooo_list) { | |
886 | if (ooo_cmdsn->cmdsn != sess->exp_cmd_sn) | |
887 | continue; | |
888 | ||
889 | if (!ooo_cmdsn->cmd) { | |
890 | sess->exp_cmd_sn++; | |
891 | iscsit_remove_ooo_cmdsn(sess, ooo_cmdsn); | |
892 | continue; | |
893 | } | |
894 | ||
895 | cmd = ooo_cmdsn->cmd; | |
896 | cmd->i_state = cmd->deferred_i_state; | |
897 | ooo_count++; | |
898 | sess->exp_cmd_sn++; | |
899 | pr_debug("Executing out of order CmdSN: 0x%08x," | |
900 | " incremented ExpCmdSN to 0x%08x.\n", | |
901 | cmd->cmd_sn, sess->exp_cmd_sn); | |
902 | ||
903 | iscsit_remove_ooo_cmdsn(sess, ooo_cmdsn); | |
904 | ||
905 | if (iscsit_execute_cmd(cmd, 1) < 0) | |
906 | return -1; | |
907 | ||
908 | continue; | |
909 | } | |
910 | ||
911 | return ooo_count; | |
912 | } | |
913 | ||
914 | /* | |
915 | * Called either: | |
916 | * | |
917 | * 1. With sess->cmdsn_mutex held from iscsi_execute_ooo_cmdsns() | |
918 | * or iscsi_check_received_cmdsn(). | |
919 | * 2. With no locks held directly from iscsi_handle_XXX_pdu() functions | |
920 | * for immediate commands. | |
921 | */ | |
922 | int iscsit_execute_cmd(struct iscsi_cmd *cmd, int ooo) | |
923 | { | |
924 | struct se_cmd *se_cmd = &cmd->se_cmd; | |
3e1c81a9 | 925 | struct iscsi_conn *conn = cmd->conn; |
e48354ce NB |
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 | |
de103c93 | 936 | * any SCSI CDB exceptions that may have occurred. |
e48354ce | 937 | */ |
de103c93 CH |
938 | if (cmd->sense_reason) { |
939 | if (cmd->sense_reason == TCM_RESERVATION_CONFLICT) { | |
e48354ce NB |
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, | |
de103c93 | 962 | cmd->sense_reason, 0); |
e48354ce NB |
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); | |
67441b68 CH |
971 | target_execute_cmd(&cmd->se_cmd); |
972 | return 0; | |
e48354ce NB |
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); | |
3e1c81a9 | 988 | conn->conn_transport->iscsit_get_dataout(conn, cmd, false); |
e48354ce NB |
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 | ||
3e1c81a9 | 1006 | iscsit_set_unsoliticed_dataout(cmd); |
e48354ce NB |
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: | |
de103c93 | 1016 | if (cmd->se_cmd.se_tmr_req->response) { |
e48354ce NB |
1017 | spin_unlock_bh(&cmd->istate_lock); |
1018 | iscsit_add_cmd_to_response_queue(cmd, cmd->conn, | |
1019 | cmd->i_state); | |
1020 | return 0; | |
1021 | } | |
1022 | spin_unlock_bh(&cmd->istate_lock); | |
1023 | ||
1024 | return transport_generic_handle_tmr(&cmd->se_cmd); | |
1025 | case ISCSI_OP_LOGOUT: | |
1026 | spin_unlock_bh(&cmd->istate_lock); | |
1027 | switch (cmd->logout_reason) { | |
1028 | case ISCSI_LOGOUT_REASON_CLOSE_SESSION: | |
1029 | lr = iscsit_logout_closesession(cmd, cmd->conn); | |
1030 | break; | |
1031 | case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION: | |
1032 | lr = iscsit_logout_closeconnection(cmd, cmd->conn); | |
1033 | break; | |
1034 | case ISCSI_LOGOUT_REASON_RECOVERY: | |
1035 | lr = iscsit_logout_removeconnforrecovery(cmd, cmd->conn); | |
1036 | break; | |
1037 | default: | |
1038 | pr_err("Unknown iSCSI Logout Request Code:" | |
1039 | " 0x%02x\n", cmd->logout_reason); | |
1040 | return -1; | |
1041 | } | |
1042 | ||
1043 | return lr; | |
1044 | default: | |
1045 | spin_unlock_bh(&cmd->istate_lock); | |
1046 | pr_err("Cannot perform out of order execution for" | |
1047 | " unknown iSCSI Opcode: 0x%02x\n", cmd->iscsi_opcode); | |
1048 | return -1; | |
1049 | } | |
1050 | ||
1051 | return 0; | |
1052 | } | |
1053 | ||
1054 | void iscsit_free_all_ooo_cmdsns(struct iscsi_session *sess) | |
1055 | { | |
1056 | struct iscsi_ooo_cmdsn *ooo_cmdsn, *ooo_cmdsn_tmp; | |
1057 | ||
1058 | mutex_lock(&sess->cmdsn_mutex); | |
1059 | list_for_each_entry_safe(ooo_cmdsn, ooo_cmdsn_tmp, | |
1060 | &sess->sess_ooo_cmdsn_list, ooo_list) { | |
1061 | ||
1062 | list_del(&ooo_cmdsn->ooo_list); | |
1063 | kmem_cache_free(lio_ooo_cache, ooo_cmdsn); | |
1064 | } | |
1065 | mutex_unlock(&sess->cmdsn_mutex); | |
1066 | } | |
1067 | ||
1068 | int iscsit_handle_ooo_cmdsn( | |
1069 | struct iscsi_session *sess, | |
1070 | struct iscsi_cmd *cmd, | |
1071 | u32 cmdsn) | |
1072 | { | |
1073 | int batch = 0; | |
1074 | struct iscsi_ooo_cmdsn *ooo_cmdsn = NULL, *ooo_tail = NULL; | |
1075 | ||
1076 | cmd->deferred_i_state = cmd->i_state; | |
1077 | cmd->i_state = ISTATE_DEFERRED_CMD; | |
1078 | cmd->cmd_flags |= ICF_OOO_CMDSN; | |
1079 | ||
1080 | if (list_empty(&sess->sess_ooo_cmdsn_list)) | |
1081 | batch = 1; | |
1082 | else { | |
1083 | ooo_tail = list_entry(sess->sess_ooo_cmdsn_list.prev, | |
1084 | typeof(*ooo_tail), ooo_list); | |
1085 | if (ooo_tail->cmdsn != (cmdsn - 1)) | |
1086 | batch = 1; | |
1087 | } | |
1088 | ||
1089 | ooo_cmdsn = iscsit_allocate_ooo_cmdsn(); | |
1090 | if (!ooo_cmdsn) | |
561bf158 | 1091 | return -ENOMEM; |
e48354ce NB |
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); | |
561bf158 | 1102 | return -ENOMEM; |
e48354ce NB |
1103 | } |
1104 | ||
561bf158 | 1105 | return 0; |
e48354ce NB |
1106 | } |
1107 | ||
1108 | static int iscsit_set_dataout_timeout_values( | |
1109 | struct iscsi_cmd *cmd, | |
1110 | u32 *offset, | |
1111 | u32 *length) | |
1112 | { | |
1113 | struct iscsi_conn *conn = cmd->conn; | |
1114 | struct iscsi_r2t *r2t; | |
1115 | ||
1116 | if (cmd->unsolicited_data) { | |
1117 | *offset = 0; | |
1118 | *length = (conn->sess->sess_ops->FirstBurstLength > | |
ebf1d95c AG |
1119 | cmd->se_cmd.data_length) ? |
1120 | cmd->se_cmd.data_length : | |
e48354ce NB |
1121 | conn->sess->sess_ops->FirstBurstLength; |
1122 | return 0; | |
1123 | } | |
1124 | ||
1125 | spin_lock_bh(&cmd->r2t_lock); | |
1126 | if (list_empty(&cmd->cmd_r2t_list)) { | |
1127 | pr_err("cmd->cmd_r2t_list is empty!\n"); | |
1128 | spin_unlock_bh(&cmd->r2t_lock); | |
1129 | return -1; | |
1130 | } | |
1131 | ||
1132 | list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) { | |
1133 | if (r2t->sent_r2t && !r2t->recovery_r2t && !r2t->seq_complete) { | |
1134 | *offset = r2t->offset; | |
1135 | *length = r2t->xfer_len; | |
1136 | spin_unlock_bh(&cmd->r2t_lock); | |
1137 | return 0; | |
1138 | } | |
1139 | } | |
1140 | spin_unlock_bh(&cmd->r2t_lock); | |
1141 | ||
1142 | pr_err("Unable to locate any incomplete DataOUT" | |
1143 | " sequences for ITT: 0x%08x.\n", cmd->init_task_tag); | |
1144 | ||
1145 | return -1; | |
1146 | } | |
1147 | ||
1148 | /* | |
1149 | * NOTE: Called from interrupt (timer) context. | |
1150 | */ | |
1151 | static void iscsit_handle_dataout_timeout(unsigned long data) | |
1152 | { | |
1153 | u32 pdu_length = 0, pdu_offset = 0; | |
1154 | u32 r2t_length = 0, r2t_offset = 0; | |
1155 | struct iscsi_cmd *cmd = (struct iscsi_cmd *) data; | |
1156 | struct iscsi_conn *conn = cmd->conn; | |
1157 | struct iscsi_session *sess = NULL; | |
1158 | struct iscsi_node_attrib *na; | |
1159 | ||
1160 | iscsit_inc_conn_usage_count(conn); | |
1161 | ||
1162 | spin_lock_bh(&cmd->dataout_timeout_lock); | |
1163 | if (cmd->dataout_timer_flags & ISCSI_TF_STOP) { | |
1164 | spin_unlock_bh(&cmd->dataout_timeout_lock); | |
1165 | iscsit_dec_conn_usage_count(conn); | |
1166 | return; | |
1167 | } | |
1168 | cmd->dataout_timer_flags &= ~ISCSI_TF_RUNNING; | |
1169 | sess = conn->sess; | |
1170 | na = iscsit_tpg_get_node_attrib(sess); | |
1171 | ||
1172 | if (!sess->sess_ops->ErrorRecoveryLevel) { | |
1173 | pr_debug("Unable to recover from DataOut timeout while" | |
1174 | " in ERL=0.\n"); | |
1175 | goto failure; | |
1176 | } | |
1177 | ||
1178 | if (++cmd->dataout_timeout_retries == na->dataout_timeout_retries) { | |
1179 | pr_debug("Command ITT: 0x%08x exceeded max retries" | |
1180 | " for DataOUT timeout %u, closing iSCSI connection.\n", | |
1181 | cmd->init_task_tag, na->dataout_timeout_retries); | |
1182 | goto failure; | |
1183 | } | |
1184 | ||
1185 | cmd->cmd_flags |= ICF_WITHIN_COMMAND_RECOVERY; | |
1186 | ||
1187 | if (conn->sess->sess_ops->DataSequenceInOrder) { | |
1188 | if (conn->sess->sess_ops->DataPDUInOrder) { | |
1189 | pdu_offset = cmd->write_data_done; | |
1190 | if ((pdu_offset + (conn->sess->sess_ops->MaxBurstLength - | |
ebf1d95c AG |
1191 | cmd->next_burst_len)) > cmd->se_cmd.data_length) |
1192 | pdu_length = (cmd->se_cmd.data_length - | |
e48354ce NB |
1193 | cmd->write_data_done); |
1194 | else | |
1195 | pdu_length = (conn->sess->sess_ops->MaxBurstLength - | |
1196 | cmd->next_burst_len); | |
1197 | } else { | |
1198 | pdu_offset = cmd->seq_start_offset; | |
1199 | pdu_length = (cmd->seq_end_offset - | |
1200 | cmd->seq_start_offset); | |
1201 | } | |
1202 | } else { | |
1203 | if (iscsit_set_dataout_timeout_values(cmd, &pdu_offset, | |
1204 | &pdu_length) < 0) | |
1205 | goto failure; | |
1206 | } | |
1207 | ||
1208 | if (iscsit_recalculate_dataout_values(cmd, pdu_offset, pdu_length, | |
1209 | &r2t_offset, &r2t_length) < 0) | |
1210 | goto failure; | |
1211 | ||
1212 | pr_debug("Command ITT: 0x%08x timed out waiting for" | |
1213 | " completion of %sDataOUT Sequence Offset: %u, Length: %u\n", | |
1214 | cmd->init_task_tag, (cmd->unsolicited_data) ? "Unsolicited " : | |
1215 | "", r2t_offset, r2t_length); | |
1216 | ||
1217 | if (iscsit_send_recovery_r2t(cmd, r2t_offset, r2t_length) < 0) | |
1218 | goto failure; | |
1219 | ||
1220 | iscsit_start_dataout_timer(cmd, conn); | |
1221 | spin_unlock_bh(&cmd->dataout_timeout_lock); | |
1222 | iscsit_dec_conn_usage_count(conn); | |
1223 | ||
1224 | return; | |
1225 | ||
1226 | failure: | |
1227 | spin_unlock_bh(&cmd->dataout_timeout_lock); | |
1228 | iscsit_cause_connection_reinstatement(conn, 0); | |
1229 | iscsit_dec_conn_usage_count(conn); | |
1230 | } | |
1231 | ||
1232 | void iscsit_mod_dataout_timer(struct iscsi_cmd *cmd) | |
1233 | { | |
1234 | struct iscsi_conn *conn = cmd->conn; | |
1235 | struct iscsi_session *sess = conn->sess; | |
e8904dc5 | 1236 | struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); |
e48354ce NB |
1237 | |
1238 | spin_lock_bh(&cmd->dataout_timeout_lock); | |
1239 | if (!(cmd->dataout_timer_flags & ISCSI_TF_RUNNING)) { | |
1240 | spin_unlock_bh(&cmd->dataout_timeout_lock); | |
1241 | return; | |
1242 | } | |
1243 | ||
1244 | mod_timer(&cmd->dataout_timer, | |
1245 | (get_jiffies_64() + na->dataout_timeout * HZ)); | |
1246 | pr_debug("Updated DataOUT timer for ITT: 0x%08x", | |
1247 | cmd->init_task_tag); | |
1248 | spin_unlock_bh(&cmd->dataout_timeout_lock); | |
1249 | } | |
1250 | ||
1251 | /* | |
1252 | * Called with cmd->dataout_timeout_lock held. | |
1253 | */ | |
1254 | void iscsit_start_dataout_timer( | |
1255 | struct iscsi_cmd *cmd, | |
1256 | struct iscsi_conn *conn) | |
1257 | { | |
1258 | struct iscsi_session *sess = conn->sess; | |
e8904dc5 | 1259 | struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); |
e48354ce NB |
1260 | |
1261 | if (cmd->dataout_timer_flags & ISCSI_TF_RUNNING) | |
1262 | return; | |
1263 | ||
1264 | pr_debug("Starting DataOUT timer for ITT: 0x%08x on" | |
1265 | " CID: %hu.\n", cmd->init_task_tag, conn->cid); | |
1266 | ||
1267 | init_timer(&cmd->dataout_timer); | |
1268 | cmd->dataout_timer.expires = (get_jiffies_64() + na->dataout_timeout * HZ); | |
1269 | cmd->dataout_timer.data = (unsigned long)cmd; | |
1270 | cmd->dataout_timer.function = iscsit_handle_dataout_timeout; | |
1271 | cmd->dataout_timer_flags &= ~ISCSI_TF_STOP; | |
1272 | cmd->dataout_timer_flags |= ISCSI_TF_RUNNING; | |
1273 | add_timer(&cmd->dataout_timer); | |
1274 | } | |
1275 | ||
1276 | void iscsit_stop_dataout_timer(struct iscsi_cmd *cmd) | |
1277 | { | |
1278 | spin_lock_bh(&cmd->dataout_timeout_lock); | |
1279 | if (!(cmd->dataout_timer_flags & ISCSI_TF_RUNNING)) { | |
1280 | spin_unlock_bh(&cmd->dataout_timeout_lock); | |
1281 | return; | |
1282 | } | |
1283 | cmd->dataout_timer_flags |= ISCSI_TF_STOP; | |
1284 | spin_unlock_bh(&cmd->dataout_timeout_lock); | |
1285 | ||
1286 | del_timer_sync(&cmd->dataout_timer); | |
1287 | ||
1288 | spin_lock_bh(&cmd->dataout_timeout_lock); | |
1289 | cmd->dataout_timer_flags &= ~ISCSI_TF_RUNNING; | |
1290 | pr_debug("Stopped DataOUT Timer for ITT: 0x%08x\n", | |
1291 | cmd->init_task_tag); | |
1292 | spin_unlock_bh(&cmd->dataout_timeout_lock); | |
1293 | } | |
3e1c81a9 | 1294 | EXPORT_SYMBOL(iscsit_stop_dataout_timer); |