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e48354ce NB |
1 | /****************************************************************************** |
2 | * This file contains error recovery level zero functions used by | |
3 | * the iSCSI Target driver. | |
4 | * | |
4c76251e | 5 | * (c) Copyright 2007-2013 Datera, Inc. |
e48354ce NB |
6 | * |
7 | * Author: Nicholas A. Bellinger <nab@linux-iscsi.org> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | ******************************************************************************/ | |
19 | ||
20 | #include <scsi/iscsi_proto.h> | |
21 | #include <target/target_core_base.h> | |
c4795fb2 | 22 | #include <target/target_core_fabric.h> |
e48354ce | 23 | |
67f091f2 | 24 | #include <target/iscsi/iscsi_target_core.h> |
e48354ce | 25 | #include "iscsi_target_seq_pdu_list.h" |
e48354ce NB |
26 | #include "iscsi_target_erl0.h" |
27 | #include "iscsi_target_erl1.h" | |
28 | #include "iscsi_target_erl2.h" | |
29 | #include "iscsi_target_util.h" | |
30 | #include "iscsi_target.h" | |
31 | ||
32 | /* | |
33 | * Used to set values in struct iscsi_cmd that iscsit_dataout_check_sequence() | |
34 | * checks against to determine a PDU's Offset+Length is within the current | |
35 | * DataOUT Sequence. Used for DataSequenceInOrder=Yes only. | |
36 | */ | |
37 | void iscsit_set_dataout_sequence_values( | |
38 | struct iscsi_cmd *cmd) | |
39 | { | |
40 | struct iscsi_conn *conn = cmd->conn; | |
41 | /* | |
42 | * Still set seq_start_offset and seq_end_offset for Unsolicited | |
43 | * DataOUT, even if DataSequenceInOrder=No. | |
44 | */ | |
45 | if (cmd->unsolicited_data) { | |
46 | cmd->seq_start_offset = cmd->write_data_done; | |
47 | cmd->seq_end_offset = (cmd->write_data_done + | |
d7ca663c DC |
48 | ((cmd->se_cmd.data_length > |
49 | conn->sess->sess_ops->FirstBurstLength) ? | |
50 | conn->sess->sess_ops->FirstBurstLength : cmd->se_cmd.data_length)); | |
e48354ce NB |
51 | return; |
52 | } | |
53 | ||
54 | if (!conn->sess->sess_ops->DataSequenceInOrder) | |
55 | return; | |
56 | ||
57 | if (!cmd->seq_start_offset && !cmd->seq_end_offset) { | |
58 | cmd->seq_start_offset = cmd->write_data_done; | |
ebf1d95c | 59 | cmd->seq_end_offset = (cmd->se_cmd.data_length > |
e48354ce NB |
60 | conn->sess->sess_ops->MaxBurstLength) ? |
61 | (cmd->write_data_done + | |
ebf1d95c | 62 | conn->sess->sess_ops->MaxBurstLength) : cmd->se_cmd.data_length; |
e48354ce NB |
63 | } else { |
64 | cmd->seq_start_offset = cmd->seq_end_offset; | |
65 | cmd->seq_end_offset = ((cmd->seq_end_offset + | |
66 | conn->sess->sess_ops->MaxBurstLength) >= | |
ebf1d95c | 67 | cmd->se_cmd.data_length) ? cmd->se_cmd.data_length : |
e48354ce NB |
68 | (cmd->seq_end_offset + |
69 | conn->sess->sess_ops->MaxBurstLength); | |
70 | } | |
71 | } | |
72 | ||
73 | static int iscsit_dataout_within_command_recovery_check( | |
74 | struct iscsi_cmd *cmd, | |
75 | unsigned char *buf) | |
76 | { | |
77 | struct iscsi_conn *conn = cmd->conn; | |
78 | struct iscsi_data *hdr = (struct iscsi_data *) buf; | |
79 | u32 payload_length = ntoh24(hdr->dlength); | |
80 | ||
81 | /* | |
82 | * We do the within-command recovery checks here as it is | |
83 | * the first function called in iscsi_check_pre_dataout(). | |
84 | * Basically, if we are in within-command recovery and | |
85 | * the PDU does not contain the offset the sequence needs, | |
86 | * dump the payload. | |
87 | * | |
88 | * This only applies to DataPDUInOrder=Yes, for | |
89 | * DataPDUInOrder=No we only re-request the failed PDU | |
90 | * and check that all PDUs in a sequence are received | |
91 | * upon end of sequence. | |
92 | */ | |
93 | if (conn->sess->sess_ops->DataSequenceInOrder) { | |
94 | if ((cmd->cmd_flags & ICF_WITHIN_COMMAND_RECOVERY) && | |
50e5c87d | 95 | cmd->write_data_done != be32_to_cpu(hdr->offset)) |
e48354ce NB |
96 | goto dump; |
97 | ||
98 | cmd->cmd_flags &= ~ICF_WITHIN_COMMAND_RECOVERY; | |
99 | } else { | |
100 | struct iscsi_seq *seq; | |
101 | ||
50e5c87d CH |
102 | seq = iscsit_get_seq_holder(cmd, be32_to_cpu(hdr->offset), |
103 | payload_length); | |
e48354ce NB |
104 | if (!seq) |
105 | return DATAOUT_CANNOT_RECOVER; | |
106 | /* | |
107 | * Set the struct iscsi_seq pointer to reuse later. | |
108 | */ | |
109 | cmd->seq_ptr = seq; | |
110 | ||
111 | if (conn->sess->sess_ops->DataPDUInOrder) { | |
50e5c87d CH |
112 | if (seq->status == |
113 | DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY && | |
114 | (seq->offset != be32_to_cpu(hdr->offset) || | |
115 | seq->data_sn != be32_to_cpu(hdr->datasn))) | |
e48354ce NB |
116 | goto dump; |
117 | } else { | |
50e5c87d CH |
118 | if (seq->status == |
119 | DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY && | |
120 | seq->data_sn != be32_to_cpu(hdr->datasn)) | |
e48354ce NB |
121 | goto dump; |
122 | } | |
123 | ||
124 | if (seq->status == DATAOUT_SEQUENCE_COMPLETE) | |
125 | goto dump; | |
126 | ||
127 | if (seq->status != DATAOUT_SEQUENCE_COMPLETE) | |
128 | seq->status = 0; | |
129 | } | |
130 | ||
131 | return DATAOUT_NORMAL; | |
132 | ||
133 | dump: | |
134 | pr_err("Dumping DataOUT PDU Offset: %u Length: %d DataSN:" | |
135 | " 0x%08x\n", hdr->offset, payload_length, hdr->datasn); | |
136 | return iscsit_dump_data_payload(conn, payload_length, 1); | |
137 | } | |
138 | ||
139 | static int iscsit_dataout_check_unsolicited_sequence( | |
140 | struct iscsi_cmd *cmd, | |
141 | unsigned char *buf) | |
142 | { | |
143 | u32 first_burst_len; | |
144 | struct iscsi_conn *conn = cmd->conn; | |
145 | struct iscsi_data *hdr = (struct iscsi_data *) buf; | |
146 | u32 payload_length = ntoh24(hdr->dlength); | |
147 | ||
148 | ||
50e5c87d CH |
149 | if ((be32_to_cpu(hdr->offset) < cmd->seq_start_offset) || |
150 | ((be32_to_cpu(hdr->offset) + payload_length) > cmd->seq_end_offset)) { | |
e48354ce NB |
151 | pr_err("Command ITT: 0x%08x with Offset: %u," |
152 | " Length: %u outside of Unsolicited Sequence %u:%u while" | |
153 | " DataSequenceInOrder=Yes.\n", cmd->init_task_tag, | |
50e5c87d | 154 | be32_to_cpu(hdr->offset), payload_length, cmd->seq_start_offset, |
e48354ce NB |
155 | cmd->seq_end_offset); |
156 | return DATAOUT_CANNOT_RECOVER; | |
157 | } | |
158 | ||
159 | first_burst_len = (cmd->first_burst_len + payload_length); | |
160 | ||
161 | if (first_burst_len > conn->sess->sess_ops->FirstBurstLength) { | |
162 | pr_err("Total %u bytes exceeds FirstBurstLength: %u" | |
163 | " for this Unsolicited DataOut Burst.\n", | |
164 | first_burst_len, conn->sess->sess_ops->FirstBurstLength); | |
165 | transport_send_check_condition_and_sense(&cmd->se_cmd, | |
166 | TCM_INCORRECT_AMOUNT_OF_DATA, 0); | |
167 | return DATAOUT_CANNOT_RECOVER; | |
168 | } | |
169 | ||
170 | /* | |
171 | * Perform various MaxBurstLength and ISCSI_FLAG_CMD_FINAL sanity | |
172 | * checks for the current Unsolicited DataOUT Sequence. | |
173 | */ | |
174 | if (hdr->flags & ISCSI_FLAG_CMD_FINAL) { | |
175 | /* | |
176 | * Ignore ISCSI_FLAG_CMD_FINAL checks while DataPDUInOrder=No, end of | |
177 | * sequence checks are handled in | |
178 | * iscsit_dataout_datapduinorder_no_fbit(). | |
179 | */ | |
180 | if (!conn->sess->sess_ops->DataPDUInOrder) | |
181 | goto out; | |
182 | ||
ebf1d95c | 183 | if ((first_burst_len != cmd->se_cmd.data_length) && |
e48354ce NB |
184 | (first_burst_len != conn->sess->sess_ops->FirstBurstLength)) { |
185 | pr_err("Unsolicited non-immediate data" | |
186 | " received %u does not equal FirstBurstLength: %u, and" | |
187 | " does not equal ExpXferLen %u.\n", first_burst_len, | |
188 | conn->sess->sess_ops->FirstBurstLength, | |
ebf1d95c | 189 | cmd->se_cmd.data_length); |
e48354ce NB |
190 | transport_send_check_condition_and_sense(&cmd->se_cmd, |
191 | TCM_INCORRECT_AMOUNT_OF_DATA, 0); | |
192 | return DATAOUT_CANNOT_RECOVER; | |
193 | } | |
194 | } else { | |
195 | if (first_burst_len == conn->sess->sess_ops->FirstBurstLength) { | |
196 | pr_err("Command ITT: 0x%08x reached" | |
197 | " FirstBurstLength: %u, but ISCSI_FLAG_CMD_FINAL is not set. protocol" | |
198 | " error.\n", cmd->init_task_tag, | |
199 | conn->sess->sess_ops->FirstBurstLength); | |
200 | return DATAOUT_CANNOT_RECOVER; | |
201 | } | |
ebf1d95c | 202 | if (first_burst_len == cmd->se_cmd.data_length) { |
e48354ce NB |
203 | pr_err("Command ITT: 0x%08x reached" |
204 | " ExpXferLen: %u, but ISCSI_FLAG_CMD_FINAL is not set. protocol" | |
ebf1d95c | 205 | " error.\n", cmd->init_task_tag, cmd->se_cmd.data_length); |
e48354ce NB |
206 | return DATAOUT_CANNOT_RECOVER; |
207 | } | |
208 | } | |
209 | ||
210 | out: | |
211 | return DATAOUT_NORMAL; | |
212 | } | |
213 | ||
214 | static int iscsit_dataout_check_sequence( | |
215 | struct iscsi_cmd *cmd, | |
216 | unsigned char *buf) | |
217 | { | |
218 | u32 next_burst_len; | |
219 | struct iscsi_conn *conn = cmd->conn; | |
220 | struct iscsi_seq *seq = NULL; | |
221 | struct iscsi_data *hdr = (struct iscsi_data *) buf; | |
222 | u32 payload_length = ntoh24(hdr->dlength); | |
223 | ||
224 | /* | |
225 | * For DataSequenceInOrder=Yes: Check that the offset and offset+length | |
226 | * is within range as defined by iscsi_set_dataout_sequence_values(). | |
227 | * | |
228 | * For DataSequenceInOrder=No: Check that an struct iscsi_seq exists for | |
229 | * offset+length tuple. | |
230 | */ | |
231 | if (conn->sess->sess_ops->DataSequenceInOrder) { | |
232 | /* | |
233 | * Due to possibility of recovery DataOUT sent by the initiator | |
234 | * fullfilling an Recovery R2T, it's best to just dump the | |
235 | * payload here, instead of erroring out. | |
236 | */ | |
50e5c87d CH |
237 | if ((be32_to_cpu(hdr->offset) < cmd->seq_start_offset) || |
238 | ((be32_to_cpu(hdr->offset) + payload_length) > cmd->seq_end_offset)) { | |
e48354ce NB |
239 | pr_err("Command ITT: 0x%08x with Offset: %u," |
240 | " Length: %u outside of Sequence %u:%u while" | |
241 | " DataSequenceInOrder=Yes.\n", cmd->init_task_tag, | |
50e5c87d | 242 | be32_to_cpu(hdr->offset), payload_length, cmd->seq_start_offset, |
e48354ce NB |
243 | cmd->seq_end_offset); |
244 | ||
245 | if (iscsit_dump_data_payload(conn, payload_length, 1) < 0) | |
246 | return DATAOUT_CANNOT_RECOVER; | |
247 | return DATAOUT_WITHIN_COMMAND_RECOVERY; | |
248 | } | |
249 | ||
250 | next_burst_len = (cmd->next_burst_len + payload_length); | |
251 | } else { | |
50e5c87d CH |
252 | seq = iscsit_get_seq_holder(cmd, be32_to_cpu(hdr->offset), |
253 | payload_length); | |
e48354ce NB |
254 | if (!seq) |
255 | return DATAOUT_CANNOT_RECOVER; | |
256 | /* | |
257 | * Set the struct iscsi_seq pointer to reuse later. | |
258 | */ | |
259 | cmd->seq_ptr = seq; | |
260 | ||
261 | if (seq->status == DATAOUT_SEQUENCE_COMPLETE) { | |
262 | if (iscsit_dump_data_payload(conn, payload_length, 1) < 0) | |
263 | return DATAOUT_CANNOT_RECOVER; | |
264 | return DATAOUT_WITHIN_COMMAND_RECOVERY; | |
265 | } | |
266 | ||
267 | next_burst_len = (seq->next_burst_len + payload_length); | |
268 | } | |
269 | ||
270 | if (next_burst_len > conn->sess->sess_ops->MaxBurstLength) { | |
271 | pr_err("Command ITT: 0x%08x, NextBurstLength: %u and" | |
272 | " Length: %u exceeds MaxBurstLength: %u. protocol" | |
273 | " error.\n", cmd->init_task_tag, | |
274 | (next_burst_len - payload_length), | |
275 | payload_length, conn->sess->sess_ops->MaxBurstLength); | |
276 | return DATAOUT_CANNOT_RECOVER; | |
277 | } | |
278 | ||
279 | /* | |
280 | * Perform various MaxBurstLength and ISCSI_FLAG_CMD_FINAL sanity | |
281 | * checks for the current DataOUT Sequence. | |
282 | */ | |
283 | if (hdr->flags & ISCSI_FLAG_CMD_FINAL) { | |
284 | /* | |
285 | * Ignore ISCSI_FLAG_CMD_FINAL checks while DataPDUInOrder=No, end of | |
286 | * sequence checks are handled in | |
287 | * iscsit_dataout_datapduinorder_no_fbit(). | |
288 | */ | |
289 | if (!conn->sess->sess_ops->DataPDUInOrder) | |
290 | goto out; | |
291 | ||
292 | if (conn->sess->sess_ops->DataSequenceInOrder) { | |
293 | if ((next_burst_len < | |
294 | conn->sess->sess_ops->MaxBurstLength) && | |
295 | ((cmd->write_data_done + payload_length) < | |
ebf1d95c | 296 | cmd->se_cmd.data_length)) { |
e48354ce NB |
297 | pr_err("Command ITT: 0x%08x set ISCSI_FLAG_CMD_FINAL" |
298 | " before end of DataOUT sequence, protocol" | |
299 | " error.\n", cmd->init_task_tag); | |
300 | return DATAOUT_CANNOT_RECOVER; | |
301 | } | |
302 | } else { | |
303 | if (next_burst_len < seq->xfer_len) { | |
304 | pr_err("Command ITT: 0x%08x set ISCSI_FLAG_CMD_FINAL" | |
305 | " before end of DataOUT sequence, protocol" | |
306 | " error.\n", cmd->init_task_tag); | |
307 | return DATAOUT_CANNOT_RECOVER; | |
308 | } | |
309 | } | |
310 | } else { | |
311 | if (conn->sess->sess_ops->DataSequenceInOrder) { | |
312 | if (next_burst_len == | |
313 | conn->sess->sess_ops->MaxBurstLength) { | |
314 | pr_err("Command ITT: 0x%08x reached" | |
315 | " MaxBurstLength: %u, but ISCSI_FLAG_CMD_FINAL is" | |
316 | " not set, protocol error.", cmd->init_task_tag, | |
317 | conn->sess->sess_ops->MaxBurstLength); | |
318 | return DATAOUT_CANNOT_RECOVER; | |
319 | } | |
320 | if ((cmd->write_data_done + payload_length) == | |
ebf1d95c | 321 | cmd->se_cmd.data_length) { |
e48354ce NB |
322 | pr_err("Command ITT: 0x%08x reached" |
323 | " last DataOUT PDU in sequence but ISCSI_FLAG_" | |
324 | "CMD_FINAL is not set, protocol error.\n", | |
325 | cmd->init_task_tag); | |
326 | return DATAOUT_CANNOT_RECOVER; | |
327 | } | |
328 | } else { | |
329 | if (next_burst_len == seq->xfer_len) { | |
330 | pr_err("Command ITT: 0x%08x reached" | |
331 | " last DataOUT PDU in sequence but ISCSI_FLAG_" | |
332 | "CMD_FINAL is not set, protocol error.\n", | |
333 | cmd->init_task_tag); | |
334 | return DATAOUT_CANNOT_RECOVER; | |
335 | } | |
336 | } | |
337 | } | |
338 | ||
339 | out: | |
340 | return DATAOUT_NORMAL; | |
341 | } | |
342 | ||
343 | static int iscsit_dataout_check_datasn( | |
344 | struct iscsi_cmd *cmd, | |
345 | unsigned char *buf) | |
346 | { | |
e48354ce NB |
347 | u32 data_sn = 0; |
348 | struct iscsi_conn *conn = cmd->conn; | |
349 | struct iscsi_data *hdr = (struct iscsi_data *) buf; | |
350 | u32 payload_length = ntoh24(hdr->dlength); | |
351 | ||
352 | /* | |
353 | * Considering the target has no method of re-requesting DataOUT | |
354 | * by DataSN, if we receieve a greater DataSN than expected we | |
355 | * assume the functions for DataPDUInOrder=[Yes,No] below will | |
356 | * handle it. | |
357 | * | |
358 | * If the DataSN is less than expected, dump the payload. | |
359 | */ | |
360 | if (conn->sess->sess_ops->DataSequenceInOrder) | |
361 | data_sn = cmd->data_sn; | |
362 | else { | |
363 | struct iscsi_seq *seq = cmd->seq_ptr; | |
364 | data_sn = seq->data_sn; | |
365 | } | |
366 | ||
50e5c87d | 367 | if (be32_to_cpu(hdr->datasn) > data_sn) { |
e48354ce NB |
368 | pr_err("Command ITT: 0x%08x, received DataSN: 0x%08x" |
369 | " higher than expected 0x%08x.\n", cmd->init_task_tag, | |
50e5c87d | 370 | be32_to_cpu(hdr->datasn), data_sn); |
e48354ce | 371 | goto recover; |
50e5c87d | 372 | } else if (be32_to_cpu(hdr->datasn) < data_sn) { |
e48354ce NB |
373 | pr_err("Command ITT: 0x%08x, received DataSN: 0x%08x" |
374 | " lower than expected 0x%08x, discarding payload.\n", | |
50e5c87d | 375 | cmd->init_task_tag, be32_to_cpu(hdr->datasn), data_sn); |
e48354ce NB |
376 | goto dump; |
377 | } | |
378 | ||
379 | return DATAOUT_NORMAL; | |
380 | ||
381 | recover: | |
382 | if (!conn->sess->sess_ops->ErrorRecoveryLevel) { | |
383 | pr_err("Unable to perform within-command recovery" | |
384 | " while ERL=0.\n"); | |
385 | return DATAOUT_CANNOT_RECOVER; | |
386 | } | |
387 | dump: | |
388 | if (iscsit_dump_data_payload(conn, payload_length, 1) < 0) | |
389 | return DATAOUT_CANNOT_RECOVER; | |
390 | ||
5c22e229 | 391 | return DATAOUT_WITHIN_COMMAND_RECOVERY; |
e48354ce NB |
392 | } |
393 | ||
394 | static int iscsit_dataout_pre_datapduinorder_yes( | |
395 | struct iscsi_cmd *cmd, | |
396 | unsigned char *buf) | |
397 | { | |
398 | int dump = 0, recovery = 0; | |
399 | struct iscsi_conn *conn = cmd->conn; | |
400 | struct iscsi_data *hdr = (struct iscsi_data *) buf; | |
401 | u32 payload_length = ntoh24(hdr->dlength); | |
402 | ||
403 | /* | |
404 | * For DataSequenceInOrder=Yes: If the offset is greater than the global | |
405 | * DataPDUInOrder=Yes offset counter in struct iscsi_cmd a protcol error has | |
20879696 | 406 | * occurred and fail the connection. |
e48354ce NB |
407 | * |
408 | * For DataSequenceInOrder=No: If the offset is greater than the per | |
409 | * sequence DataPDUInOrder=Yes offset counter in struct iscsi_seq a protocol | |
20879696 | 410 | * error has occurred and fail the connection. |
e48354ce NB |
411 | */ |
412 | if (conn->sess->sess_ops->DataSequenceInOrder) { | |
50e5c87d | 413 | if (be32_to_cpu(hdr->offset) != cmd->write_data_done) { |
e48354ce NB |
414 | pr_err("Command ITT: 0x%08x, received offset" |
415 | " %u different than expected %u.\n", cmd->init_task_tag, | |
50e5c87d | 416 | be32_to_cpu(hdr->offset), cmd->write_data_done); |
e48354ce NB |
417 | recovery = 1; |
418 | goto recover; | |
419 | } | |
420 | } else { | |
421 | struct iscsi_seq *seq = cmd->seq_ptr; | |
422 | ||
50e5c87d | 423 | if (be32_to_cpu(hdr->offset) > seq->offset) { |
e48354ce NB |
424 | pr_err("Command ITT: 0x%08x, received offset" |
425 | " %u greater than expected %u.\n", cmd->init_task_tag, | |
50e5c87d | 426 | be32_to_cpu(hdr->offset), seq->offset); |
e48354ce NB |
427 | recovery = 1; |
428 | goto recover; | |
50e5c87d | 429 | } else if (be32_to_cpu(hdr->offset) < seq->offset) { |
e48354ce NB |
430 | pr_err("Command ITT: 0x%08x, received offset" |
431 | " %u less than expected %u, discarding payload.\n", | |
50e5c87d CH |
432 | cmd->init_task_tag, be32_to_cpu(hdr->offset), |
433 | seq->offset); | |
e48354ce NB |
434 | dump = 1; |
435 | goto dump; | |
436 | } | |
437 | } | |
438 | ||
439 | return DATAOUT_NORMAL; | |
440 | ||
441 | recover: | |
442 | if (!conn->sess->sess_ops->ErrorRecoveryLevel) { | |
443 | pr_err("Unable to perform within-command recovery" | |
444 | " while ERL=0.\n"); | |
445 | return DATAOUT_CANNOT_RECOVER; | |
446 | } | |
447 | dump: | |
448 | if (iscsit_dump_data_payload(conn, payload_length, 1) < 0) | |
449 | return DATAOUT_CANNOT_RECOVER; | |
450 | ||
451 | return (recovery) ? iscsit_recover_dataout_sequence(cmd, | |
50e5c87d | 452 | be32_to_cpu(hdr->offset), payload_length) : |
e48354ce NB |
453 | (dump) ? DATAOUT_WITHIN_COMMAND_RECOVERY : DATAOUT_NORMAL; |
454 | } | |
455 | ||
456 | static int iscsit_dataout_pre_datapduinorder_no( | |
457 | struct iscsi_cmd *cmd, | |
458 | unsigned char *buf) | |
459 | { | |
460 | struct iscsi_pdu *pdu; | |
461 | struct iscsi_data *hdr = (struct iscsi_data *) buf; | |
462 | u32 payload_length = ntoh24(hdr->dlength); | |
463 | ||
50e5c87d CH |
464 | pdu = iscsit_get_pdu_holder(cmd, be32_to_cpu(hdr->offset), |
465 | payload_length); | |
e48354ce NB |
466 | if (!pdu) |
467 | return DATAOUT_CANNOT_RECOVER; | |
468 | ||
469 | cmd->pdu_ptr = pdu; | |
470 | ||
471 | switch (pdu->status) { | |
472 | case ISCSI_PDU_NOT_RECEIVED: | |
473 | case ISCSI_PDU_CRC_FAILED: | |
474 | case ISCSI_PDU_TIMED_OUT: | |
475 | break; | |
476 | case ISCSI_PDU_RECEIVED_OK: | |
477 | pr_err("Command ITT: 0x%08x received already gotten" | |
478 | " Offset: %u, Length: %u\n", cmd->init_task_tag, | |
50e5c87d | 479 | be32_to_cpu(hdr->offset), payload_length); |
e48354ce NB |
480 | return iscsit_dump_data_payload(cmd->conn, payload_length, 1); |
481 | default: | |
482 | return DATAOUT_CANNOT_RECOVER; | |
483 | } | |
484 | ||
485 | return DATAOUT_NORMAL; | |
486 | } | |
487 | ||
488 | static int iscsit_dataout_update_r2t(struct iscsi_cmd *cmd, u32 offset, u32 length) | |
489 | { | |
490 | struct iscsi_r2t *r2t; | |
491 | ||
492 | if (cmd->unsolicited_data) | |
493 | return 0; | |
494 | ||
495 | r2t = iscsit_get_r2t_for_eos(cmd, offset, length); | |
496 | if (!r2t) | |
497 | return -1; | |
498 | ||
499 | spin_lock_bh(&cmd->r2t_lock); | |
500 | r2t->seq_complete = 1; | |
501 | cmd->outstanding_r2ts--; | |
502 | spin_unlock_bh(&cmd->r2t_lock); | |
503 | ||
504 | return 0; | |
505 | } | |
506 | ||
507 | static int iscsit_dataout_update_datapduinorder_no( | |
508 | struct iscsi_cmd *cmd, | |
509 | u32 data_sn, | |
510 | int f_bit) | |
511 | { | |
512 | int ret = 0; | |
513 | struct iscsi_pdu *pdu = cmd->pdu_ptr; | |
514 | ||
515 | pdu->data_sn = data_sn; | |
516 | ||
517 | switch (pdu->status) { | |
518 | case ISCSI_PDU_NOT_RECEIVED: | |
519 | pdu->status = ISCSI_PDU_RECEIVED_OK; | |
520 | break; | |
521 | case ISCSI_PDU_CRC_FAILED: | |
522 | pdu->status = ISCSI_PDU_RECEIVED_OK; | |
523 | break; | |
524 | case ISCSI_PDU_TIMED_OUT: | |
525 | pdu->status = ISCSI_PDU_RECEIVED_OK; | |
526 | break; | |
527 | default: | |
528 | return DATAOUT_CANNOT_RECOVER; | |
529 | } | |
530 | ||
531 | if (f_bit) { | |
532 | ret = iscsit_dataout_datapduinorder_no_fbit(cmd, pdu); | |
533 | if (ret == DATAOUT_CANNOT_RECOVER) | |
534 | return ret; | |
535 | } | |
536 | ||
537 | return DATAOUT_NORMAL; | |
538 | } | |
539 | ||
540 | static int iscsit_dataout_post_crc_passed( | |
541 | struct iscsi_cmd *cmd, | |
542 | unsigned char *buf) | |
543 | { | |
544 | int ret, send_r2t = 0; | |
545 | struct iscsi_conn *conn = cmd->conn; | |
546 | struct iscsi_seq *seq = NULL; | |
547 | struct iscsi_data *hdr = (struct iscsi_data *) buf; | |
548 | u32 payload_length = ntoh24(hdr->dlength); | |
549 | ||
550 | if (cmd->unsolicited_data) { | |
551 | if ((cmd->first_burst_len + payload_length) == | |
552 | conn->sess->sess_ops->FirstBurstLength) { | |
50e5c87d | 553 | if (iscsit_dataout_update_r2t(cmd, be32_to_cpu(hdr->offset), |
e48354ce NB |
554 | payload_length) < 0) |
555 | return DATAOUT_CANNOT_RECOVER; | |
556 | send_r2t = 1; | |
557 | } | |
558 | ||
559 | if (!conn->sess->sess_ops->DataPDUInOrder) { | |
560 | ret = iscsit_dataout_update_datapduinorder_no(cmd, | |
50e5c87d CH |
561 | be32_to_cpu(hdr->datasn), |
562 | (hdr->flags & ISCSI_FLAG_CMD_FINAL)); | |
e48354ce NB |
563 | if (ret == DATAOUT_CANNOT_RECOVER) |
564 | return ret; | |
565 | } | |
566 | ||
567 | cmd->first_burst_len += payload_length; | |
568 | ||
569 | if (conn->sess->sess_ops->DataSequenceInOrder) | |
570 | cmd->data_sn++; | |
571 | else { | |
572 | seq = cmd->seq_ptr; | |
573 | seq->data_sn++; | |
574 | seq->offset += payload_length; | |
575 | } | |
576 | ||
577 | if (send_r2t) { | |
578 | if (seq) | |
579 | seq->status = DATAOUT_SEQUENCE_COMPLETE; | |
580 | cmd->first_burst_len = 0; | |
581 | cmd->unsolicited_data = 0; | |
582 | } | |
583 | } else { | |
584 | if (conn->sess->sess_ops->DataSequenceInOrder) { | |
585 | if ((cmd->next_burst_len + payload_length) == | |
586 | conn->sess->sess_ops->MaxBurstLength) { | |
50e5c87d CH |
587 | if (iscsit_dataout_update_r2t(cmd, |
588 | be32_to_cpu(hdr->offset), | |
e48354ce NB |
589 | payload_length) < 0) |
590 | return DATAOUT_CANNOT_RECOVER; | |
591 | send_r2t = 1; | |
592 | } | |
593 | ||
594 | if (!conn->sess->sess_ops->DataPDUInOrder) { | |
595 | ret = iscsit_dataout_update_datapduinorder_no( | |
50e5c87d | 596 | cmd, be32_to_cpu(hdr->datasn), |
e48354ce NB |
597 | (hdr->flags & ISCSI_FLAG_CMD_FINAL)); |
598 | if (ret == DATAOUT_CANNOT_RECOVER) | |
599 | return ret; | |
600 | } | |
601 | ||
602 | cmd->next_burst_len += payload_length; | |
603 | cmd->data_sn++; | |
604 | ||
605 | if (send_r2t) | |
606 | cmd->next_burst_len = 0; | |
607 | } else { | |
608 | seq = cmd->seq_ptr; | |
609 | ||
610 | if ((seq->next_burst_len + payload_length) == | |
611 | seq->xfer_len) { | |
50e5c87d CH |
612 | if (iscsit_dataout_update_r2t(cmd, |
613 | be32_to_cpu(hdr->offset), | |
e48354ce NB |
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( | |
50e5c87d | 621 | cmd, be32_to_cpu(hdr->datasn), |
e48354ce NB |
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 | ||
ebf1d95c | 643 | if (cmd->write_data_done == cmd->se_cmd.data_length) |
c6037cc5 AG |
644 | return DATAOUT_SEND_TO_TRANSPORT; |
645 | else if (send_r2t) | |
646 | return DATAOUT_SEND_R2T; | |
647 | else | |
648 | return DATAOUT_NORMAL; | |
e48354ce NB |
649 | } |
650 | ||
651 | static int iscsit_dataout_post_crc_failed( | |
652 | struct iscsi_cmd *cmd, | |
653 | unsigned char *buf) | |
654 | { | |
655 | struct iscsi_conn *conn = cmd->conn; | |
656 | struct iscsi_pdu *pdu; | |
657 | struct iscsi_data *hdr = (struct iscsi_data *) buf; | |
658 | u32 payload_length = ntoh24(hdr->dlength); | |
659 | ||
660 | if (conn->sess->sess_ops->DataPDUInOrder) | |
661 | goto recover; | |
662 | /* | |
663 | * The rest of this function is only called when DataPDUInOrder=No. | |
664 | */ | |
665 | pdu = cmd->pdu_ptr; | |
666 | ||
667 | switch (pdu->status) { | |
668 | case ISCSI_PDU_NOT_RECEIVED: | |
669 | pdu->status = ISCSI_PDU_CRC_FAILED; | |
670 | break; | |
671 | case ISCSI_PDU_CRC_FAILED: | |
672 | break; | |
673 | case ISCSI_PDU_TIMED_OUT: | |
674 | pdu->status = ISCSI_PDU_CRC_FAILED; | |
675 | break; | |
676 | default: | |
677 | return DATAOUT_CANNOT_RECOVER; | |
678 | } | |
679 | ||
680 | recover: | |
50e5c87d CH |
681 | return iscsit_recover_dataout_sequence(cmd, be32_to_cpu(hdr->offset), |
682 | payload_length); | |
e48354ce NB |
683 | } |
684 | ||
685 | /* | |
686 | * Called from iscsit_handle_data_out() before DataOUT Payload is received | |
687 | * and CRC computed. | |
688 | */ | |
fceb5bc7 | 689 | int iscsit_check_pre_dataout( |
e48354ce NB |
690 | struct iscsi_cmd *cmd, |
691 | unsigned char *buf) | |
692 | { | |
693 | int ret; | |
694 | struct iscsi_conn *conn = cmd->conn; | |
695 | ||
696 | ret = iscsit_dataout_within_command_recovery_check(cmd, buf); | |
697 | if ((ret == DATAOUT_WITHIN_COMMAND_RECOVERY) || | |
698 | (ret == DATAOUT_CANNOT_RECOVER)) | |
699 | return ret; | |
700 | ||
701 | ret = iscsit_dataout_check_datasn(cmd, buf); | |
702 | if ((ret == DATAOUT_WITHIN_COMMAND_RECOVERY) || | |
703 | (ret == DATAOUT_CANNOT_RECOVER)) | |
704 | return ret; | |
705 | ||
706 | if (cmd->unsolicited_data) { | |
707 | ret = iscsit_dataout_check_unsolicited_sequence(cmd, buf); | |
708 | if ((ret == DATAOUT_WITHIN_COMMAND_RECOVERY) || | |
709 | (ret == DATAOUT_CANNOT_RECOVER)) | |
710 | return ret; | |
711 | } else { | |
712 | ret = iscsit_dataout_check_sequence(cmd, buf); | |
713 | if ((ret == DATAOUT_WITHIN_COMMAND_RECOVERY) || | |
714 | (ret == DATAOUT_CANNOT_RECOVER)) | |
715 | return ret; | |
716 | } | |
717 | ||
718 | return (conn->sess->sess_ops->DataPDUInOrder) ? | |
719 | iscsit_dataout_pre_datapduinorder_yes(cmd, buf) : | |
720 | iscsit_dataout_pre_datapduinorder_no(cmd, buf); | |
721 | } | |
722 | ||
723 | /* | |
724 | * Called from iscsit_handle_data_out() after DataOUT Payload is received | |
725 | * and CRC computed. | |
726 | */ | |
727 | int iscsit_check_post_dataout( | |
728 | struct iscsi_cmd *cmd, | |
729 | unsigned char *buf, | |
730 | u8 data_crc_failed) | |
731 | { | |
732 | struct iscsi_conn *conn = cmd->conn; | |
733 | ||
734 | cmd->dataout_timeout_retries = 0; | |
735 | ||
736 | if (!data_crc_failed) | |
737 | return iscsit_dataout_post_crc_passed(cmd, buf); | |
738 | else { | |
739 | if (!conn->sess->sess_ops->ErrorRecoveryLevel) { | |
740 | pr_err("Unable to recover from DataOUT CRC" | |
741 | " failure while ERL=0, closing session.\n"); | |
ba159914 NB |
742 | iscsit_reject_cmd(cmd, ISCSI_REASON_DATA_DIGEST_ERROR, |
743 | buf); | |
e48354ce NB |
744 | return DATAOUT_CANNOT_RECOVER; |
745 | } | |
746 | ||
ba159914 | 747 | iscsit_reject_cmd(cmd, ISCSI_REASON_DATA_DIGEST_ERROR, buf); |
e48354ce NB |
748 | return iscsit_dataout_post_crc_failed(cmd, buf); |
749 | } | |
750 | } | |
751 | ||
752 | static void iscsit_handle_time2retain_timeout(unsigned long data) | |
753 | { | |
754 | struct iscsi_session *sess = (struct iscsi_session *) data; | |
60bfcf8e | 755 | struct iscsi_portal_group *tpg = sess->tpg; |
e48354ce NB |
756 | struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; |
757 | ||
758 | spin_lock_bh(&se_tpg->session_lock); | |
759 | if (sess->time2retain_timer_flags & ISCSI_TF_STOP) { | |
760 | spin_unlock_bh(&se_tpg->session_lock); | |
761 | return; | |
762 | } | |
763 | if (atomic_read(&sess->session_reinstatement)) { | |
764 | pr_err("Exiting Time2Retain handler because" | |
765 | " session_reinstatement=1\n"); | |
766 | spin_unlock_bh(&se_tpg->session_lock); | |
767 | return; | |
768 | } | |
769 | sess->time2retain_timer_flags |= ISCSI_TF_EXPIRED; | |
770 | ||
771 | pr_err("Time2Retain timer expired for SID: %u, cleaning up" | |
772 | " iSCSI session.\n", sess->sid); | |
773 | { | |
774 | struct iscsi_tiqn *tiqn = tpg->tpg_tiqn; | |
775 | ||
776 | if (tiqn) { | |
777 | spin_lock(&tiqn->sess_err_stats.lock); | |
778 | strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name, | |
779 | (void *)sess->sess_ops->InitiatorName); | |
780 | tiqn->sess_err_stats.last_sess_failure_type = | |
781 | ISCSI_SESS_ERR_CXN_TIMEOUT; | |
782 | tiqn->sess_err_stats.cxn_timeout_errors++; | |
04f3b31b | 783 | atomic_long_inc(&sess->conn_timeout_errors); |
e48354ce NB |
784 | spin_unlock(&tiqn->sess_err_stats.lock); |
785 | } | |
786 | } | |
787 | ||
788 | spin_unlock_bh(&se_tpg->session_lock); | |
99367f01 | 789 | target_put_session(sess->se_sess); |
e48354ce NB |
790 | } |
791 | ||
fceb5bc7 | 792 | void iscsit_start_time2retain_handler(struct iscsi_session *sess) |
e48354ce NB |
793 | { |
794 | int tpg_active; | |
795 | /* | |
20879696 | 796 | * Only start Time2Retain timer when the associated TPG is still in |
e48354ce NB |
797 | * an ACTIVE (eg: not disabled or shutdown) state. |
798 | */ | |
60bfcf8e AG |
799 | spin_lock(&sess->tpg->tpg_state_lock); |
800 | tpg_active = (sess->tpg->tpg_state == TPG_STATE_ACTIVE); | |
801 | spin_unlock(&sess->tpg->tpg_state_lock); | |
e48354ce NB |
802 | |
803 | if (!tpg_active) | |
804 | return; | |
805 | ||
806 | if (sess->time2retain_timer_flags & ISCSI_TF_RUNNING) | |
807 | return; | |
808 | ||
809 | pr_debug("Starting Time2Retain timer for %u seconds on" | |
810 | " SID: %u\n", sess->sess_ops->DefaultTime2Retain, sess->sid); | |
811 | ||
812 | init_timer(&sess->time2retain_timer); | |
813 | sess->time2retain_timer.expires = | |
814 | (get_jiffies_64() + sess->sess_ops->DefaultTime2Retain * HZ); | |
815 | sess->time2retain_timer.data = (unsigned long)sess; | |
816 | sess->time2retain_timer.function = iscsit_handle_time2retain_timeout; | |
817 | sess->time2retain_timer_flags &= ~ISCSI_TF_STOP; | |
818 | sess->time2retain_timer_flags |= ISCSI_TF_RUNNING; | |
819 | add_timer(&sess->time2retain_timer); | |
820 | } | |
821 | ||
822 | /* | |
823 | * Called with spin_lock_bh(&struct se_portal_group->session_lock) held | |
824 | */ | |
fceb5bc7 | 825 | int iscsit_stop_time2retain_timer(struct iscsi_session *sess) |
e48354ce | 826 | { |
60bfcf8e | 827 | struct iscsi_portal_group *tpg = sess->tpg; |
e48354ce NB |
828 | struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; |
829 | ||
830 | if (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED) | |
831 | return -1; | |
832 | ||
833 | if (!(sess->time2retain_timer_flags & ISCSI_TF_RUNNING)) | |
834 | return 0; | |
835 | ||
836 | sess->time2retain_timer_flags |= ISCSI_TF_STOP; | |
574780fd | 837 | spin_unlock(&se_tpg->session_lock); |
e48354ce NB |
838 | |
839 | del_timer_sync(&sess->time2retain_timer); | |
840 | ||
574780fd | 841 | spin_lock(&se_tpg->session_lock); |
e48354ce NB |
842 | sess->time2retain_timer_flags &= ~ISCSI_TF_RUNNING; |
843 | pr_debug("Stopped Time2Retain Timer for SID: %u\n", | |
844 | sess->sid); | |
845 | return 0; | |
846 | } | |
847 | ||
848 | void iscsit_connection_reinstatement_rcfr(struct iscsi_conn *conn) | |
849 | { | |
850 | spin_lock_bh(&conn->state_lock); | |
851 | if (atomic_read(&conn->connection_exit)) { | |
852 | spin_unlock_bh(&conn->state_lock); | |
853 | goto sleep; | |
854 | } | |
855 | ||
856 | if (atomic_read(&conn->transport_failed)) { | |
857 | spin_unlock_bh(&conn->state_lock); | |
858 | goto sleep; | |
859 | } | |
860 | spin_unlock_bh(&conn->state_lock); | |
861 | ||
88dcd2da NB |
862 | if (conn->tx_thread && conn->tx_thread_active) |
863 | send_sig(SIGINT, conn->tx_thread, 1); | |
864 | if (conn->rx_thread && conn->rx_thread_active) | |
865 | send_sig(SIGINT, conn->rx_thread, 1); | |
e48354ce NB |
866 | |
867 | sleep: | |
868 | wait_for_completion(&conn->conn_wait_rcfr_comp); | |
869 | complete(&conn->conn_post_wait_comp); | |
870 | } | |
871 | ||
872 | void iscsit_cause_connection_reinstatement(struct iscsi_conn *conn, int sleep) | |
873 | { | |
874 | spin_lock_bh(&conn->state_lock); | |
875 | if (atomic_read(&conn->connection_exit)) { | |
876 | spin_unlock_bh(&conn->state_lock); | |
877 | return; | |
878 | } | |
879 | ||
880 | if (atomic_read(&conn->transport_failed)) { | |
881 | spin_unlock_bh(&conn->state_lock); | |
882 | return; | |
883 | } | |
884 | ||
885 | if (atomic_read(&conn->connection_reinstatement)) { | |
886 | spin_unlock_bh(&conn->state_lock); | |
887 | return; | |
888 | } | |
889 | ||
88dcd2da NB |
890 | if (conn->tx_thread && conn->tx_thread_active) |
891 | send_sig(SIGINT, conn->tx_thread, 1); | |
892 | if (conn->rx_thread && conn->rx_thread_active) | |
893 | send_sig(SIGINT, conn->rx_thread, 1); | |
e48354ce NB |
894 | |
895 | atomic_set(&conn->connection_reinstatement, 1); | |
896 | if (!sleep) { | |
897 | spin_unlock_bh(&conn->state_lock); | |
898 | return; | |
899 | } | |
900 | ||
901 | atomic_set(&conn->sleep_on_conn_wait_comp, 1); | |
902 | spin_unlock_bh(&conn->state_lock); | |
903 | ||
904 | wait_for_completion(&conn->conn_wait_comp); | |
905 | complete(&conn->conn_post_wait_comp); | |
906 | } | |
b2cb9649 | 907 | EXPORT_SYMBOL(iscsit_cause_connection_reinstatement); |
e48354ce NB |
908 | |
909 | void iscsit_fall_back_to_erl0(struct iscsi_session *sess) | |
910 | { | |
911 | pr_debug("Falling back to ErrorRecoveryLevel=0 for SID:" | |
912 | " %u\n", sess->sid); | |
913 | ||
914 | atomic_set(&sess->session_fall_back_to_erl0, 1); | |
915 | } | |
916 | ||
917 | static void iscsit_handle_connection_cleanup(struct iscsi_conn *conn) | |
918 | { | |
919 | struct iscsi_session *sess = conn->sess; | |
920 | ||
921 | if ((sess->sess_ops->ErrorRecoveryLevel == 2) && | |
922 | !atomic_read(&sess->session_reinstatement) && | |
923 | !atomic_read(&sess->session_fall_back_to_erl0)) | |
924 | iscsit_connection_recovery_transport_reset(conn); | |
925 | else { | |
926 | pr_debug("Performing cleanup for failed iSCSI" | |
927 | " Connection ID: %hu from %s\n", conn->cid, | |
928 | sess->sess_ops->InitiatorName); | |
929 | iscsit_close_connection(conn); | |
930 | } | |
931 | } | |
932 | ||
fceb5bc7 | 933 | void iscsit_take_action_for_connection_exit(struct iscsi_conn *conn) |
e48354ce NB |
934 | { |
935 | spin_lock_bh(&conn->state_lock); | |
936 | if (atomic_read(&conn->connection_exit)) { | |
937 | spin_unlock_bh(&conn->state_lock); | |
938 | return; | |
939 | } | |
940 | atomic_set(&conn->connection_exit, 1); | |
941 | ||
942 | if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT) { | |
943 | spin_unlock_bh(&conn->state_lock); | |
2a03ee8c | 944 | iscsit_close_connection(conn); |
e48354ce NB |
945 | return; |
946 | } | |
947 | ||
948 | if (conn->conn_state == TARG_CONN_STATE_CLEANUP_WAIT) { | |
949 | spin_unlock_bh(&conn->state_lock); | |
950 | return; | |
951 | } | |
952 | ||
953 | pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n"); | |
954 | conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT; | |
955 | spin_unlock_bh(&conn->state_lock); | |
956 | ||
957 | iscsit_handle_connection_cleanup(conn); | |
958 | } |