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c942fddf | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
e48354ce NB |
2 | /****************************************************************************** |
3 | * This file contains error recovery level zero functions used by | |
4 | * the iSCSI Target driver. | |
5 | * | |
4c76251e | 6 | * (c) Copyright 2007-2013 Datera, Inc. |
e48354ce NB |
7 | * |
8 | * Author: Nicholas A. Bellinger <nab@linux-iscsi.org> | |
9 | * | |
e48354ce NB |
10 | ******************************************************************************/ |
11 | ||
3f07c014 IM |
12 | #include <linux/sched/signal.h> |
13 | ||
e48354ce NB |
14 | #include <scsi/iscsi_proto.h> |
15 | #include <target/target_core_base.h> | |
c4795fb2 | 16 | #include <target/target_core_fabric.h> |
e48354ce | 17 | |
67f091f2 | 18 | #include <target/iscsi/iscsi_target_core.h> |
e48354ce | 19 | #include "iscsi_target_seq_pdu_list.h" |
e48354ce NB |
20 | #include "iscsi_target_erl0.h" |
21 | #include "iscsi_target_erl1.h" | |
22 | #include "iscsi_target_erl2.h" | |
23 | #include "iscsi_target_util.h" | |
24 | #include "iscsi_target.h" | |
25 | ||
26 | /* | |
27 | * Used to set values in struct iscsi_cmd that iscsit_dataout_check_sequence() | |
28 | * checks against to determine a PDU's Offset+Length is within the current | |
29 | * DataOUT Sequence. Used for DataSequenceInOrder=Yes only. | |
30 | */ | |
31 | void iscsit_set_dataout_sequence_values( | |
32 | struct iscsi_cmd *cmd) | |
33 | { | |
34 | struct iscsi_conn *conn = cmd->conn; | |
35 | /* | |
36 | * Still set seq_start_offset and seq_end_offset for Unsolicited | |
37 | * DataOUT, even if DataSequenceInOrder=No. | |
38 | */ | |
39 | if (cmd->unsolicited_data) { | |
40 | cmd->seq_start_offset = cmd->write_data_done; | |
4d65491c VP |
41 | cmd->seq_end_offset = min(cmd->se_cmd.data_length, |
42 | conn->sess->sess_ops->FirstBurstLength); | |
e48354ce NB |
43 | return; |
44 | } | |
45 | ||
46 | if (!conn->sess->sess_ops->DataSequenceInOrder) | |
47 | return; | |
48 | ||
49 | if (!cmd->seq_start_offset && !cmd->seq_end_offset) { | |
50 | cmd->seq_start_offset = cmd->write_data_done; | |
ebf1d95c | 51 | cmd->seq_end_offset = (cmd->se_cmd.data_length > |
e48354ce NB |
52 | conn->sess->sess_ops->MaxBurstLength) ? |
53 | (cmd->write_data_done + | |
ebf1d95c | 54 | conn->sess->sess_ops->MaxBurstLength) : cmd->se_cmd.data_length; |
e48354ce NB |
55 | } else { |
56 | cmd->seq_start_offset = cmd->seq_end_offset; | |
57 | cmd->seq_end_offset = ((cmd->seq_end_offset + | |
58 | conn->sess->sess_ops->MaxBurstLength) >= | |
ebf1d95c | 59 | cmd->se_cmd.data_length) ? cmd->se_cmd.data_length : |
e48354ce NB |
60 | (cmd->seq_end_offset + |
61 | conn->sess->sess_ops->MaxBurstLength); | |
62 | } | |
63 | } | |
64 | ||
65 | static int iscsit_dataout_within_command_recovery_check( | |
66 | struct iscsi_cmd *cmd, | |
67 | unsigned char *buf) | |
68 | { | |
69 | struct iscsi_conn *conn = cmd->conn; | |
70 | struct iscsi_data *hdr = (struct iscsi_data *) buf; | |
71 | u32 payload_length = ntoh24(hdr->dlength); | |
72 | ||
73 | /* | |
74 | * We do the within-command recovery checks here as it is | |
75 | * the first function called in iscsi_check_pre_dataout(). | |
76 | * Basically, if we are in within-command recovery and | |
77 | * the PDU does not contain the offset the sequence needs, | |
78 | * dump the payload. | |
79 | * | |
80 | * This only applies to DataPDUInOrder=Yes, for | |
81 | * DataPDUInOrder=No we only re-request the failed PDU | |
82 | * and check that all PDUs in a sequence are received | |
83 | * upon end of sequence. | |
84 | */ | |
85 | if (conn->sess->sess_ops->DataSequenceInOrder) { | |
86 | if ((cmd->cmd_flags & ICF_WITHIN_COMMAND_RECOVERY) && | |
50e5c87d | 87 | cmd->write_data_done != be32_to_cpu(hdr->offset)) |
e48354ce NB |
88 | goto dump; |
89 | ||
90 | cmd->cmd_flags &= ~ICF_WITHIN_COMMAND_RECOVERY; | |
91 | } else { | |
92 | struct iscsi_seq *seq; | |
93 | ||
50e5c87d CH |
94 | seq = iscsit_get_seq_holder(cmd, be32_to_cpu(hdr->offset), |
95 | payload_length); | |
e48354ce NB |
96 | if (!seq) |
97 | return DATAOUT_CANNOT_RECOVER; | |
98 | /* | |
99 | * Set the struct iscsi_seq pointer to reuse later. | |
100 | */ | |
101 | cmd->seq_ptr = seq; | |
102 | ||
103 | if (conn->sess->sess_ops->DataPDUInOrder) { | |
50e5c87d CH |
104 | if (seq->status == |
105 | DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY && | |
106 | (seq->offset != be32_to_cpu(hdr->offset) || | |
107 | seq->data_sn != be32_to_cpu(hdr->datasn))) | |
e48354ce NB |
108 | goto dump; |
109 | } else { | |
50e5c87d CH |
110 | if (seq->status == |
111 | DATAOUT_SEQUENCE_WITHIN_COMMAND_RECOVERY && | |
112 | seq->data_sn != be32_to_cpu(hdr->datasn)) | |
e48354ce NB |
113 | goto dump; |
114 | } | |
115 | ||
116 | if (seq->status == DATAOUT_SEQUENCE_COMPLETE) | |
117 | goto dump; | |
118 | ||
119 | if (seq->status != DATAOUT_SEQUENCE_COMPLETE) | |
120 | seq->status = 0; | |
121 | } | |
122 | ||
123 | return DATAOUT_NORMAL; | |
124 | ||
125 | dump: | |
126 | pr_err("Dumping DataOUT PDU Offset: %u Length: %d DataSN:" | |
127 | " 0x%08x\n", hdr->offset, payload_length, hdr->datasn); | |
128 | return iscsit_dump_data_payload(conn, payload_length, 1); | |
129 | } | |
130 | ||
131 | static int iscsit_dataout_check_unsolicited_sequence( | |
132 | struct iscsi_cmd *cmd, | |
133 | unsigned char *buf) | |
134 | { | |
135 | u32 first_burst_len; | |
136 | struct iscsi_conn *conn = cmd->conn; | |
137 | struct iscsi_data *hdr = (struct iscsi_data *) buf; | |
138 | u32 payload_length = ntoh24(hdr->dlength); | |
139 | ||
140 | ||
50e5c87d CH |
141 | if ((be32_to_cpu(hdr->offset) < cmd->seq_start_offset) || |
142 | ((be32_to_cpu(hdr->offset) + payload_length) > cmd->seq_end_offset)) { | |
e48354ce NB |
143 | pr_err("Command ITT: 0x%08x with Offset: %u," |
144 | " Length: %u outside of Unsolicited Sequence %u:%u while" | |
145 | " DataSequenceInOrder=Yes.\n", cmd->init_task_tag, | |
50e5c87d | 146 | be32_to_cpu(hdr->offset), payload_length, cmd->seq_start_offset, |
e48354ce NB |
147 | cmd->seq_end_offset); |
148 | return DATAOUT_CANNOT_RECOVER; | |
149 | } | |
150 | ||
151 | first_burst_len = (cmd->first_burst_len + payload_length); | |
152 | ||
153 | if (first_burst_len > conn->sess->sess_ops->FirstBurstLength) { | |
154 | pr_err("Total %u bytes exceeds FirstBurstLength: %u" | |
155 | " for this Unsolicited DataOut Burst.\n", | |
156 | first_burst_len, conn->sess->sess_ops->FirstBurstLength); | |
157 | transport_send_check_condition_and_sense(&cmd->se_cmd, | |
158 | TCM_INCORRECT_AMOUNT_OF_DATA, 0); | |
159 | return DATAOUT_CANNOT_RECOVER; | |
160 | } | |
161 | ||
162 | /* | |
163 | * Perform various MaxBurstLength and ISCSI_FLAG_CMD_FINAL sanity | |
164 | * checks for the current Unsolicited DataOUT Sequence. | |
165 | */ | |
166 | if (hdr->flags & ISCSI_FLAG_CMD_FINAL) { | |
167 | /* | |
168 | * Ignore ISCSI_FLAG_CMD_FINAL checks while DataPDUInOrder=No, end of | |
169 | * sequence checks are handled in | |
170 | * iscsit_dataout_datapduinorder_no_fbit(). | |
171 | */ | |
172 | if (!conn->sess->sess_ops->DataPDUInOrder) | |
173 | goto out; | |
174 | ||
ebf1d95c | 175 | if ((first_burst_len != cmd->se_cmd.data_length) && |
e48354ce NB |
176 | (first_burst_len != conn->sess->sess_ops->FirstBurstLength)) { |
177 | pr_err("Unsolicited non-immediate data" | |
178 | " received %u does not equal FirstBurstLength: %u, and" | |
179 | " does not equal ExpXferLen %u.\n", first_burst_len, | |
180 | conn->sess->sess_ops->FirstBurstLength, | |
ebf1d95c | 181 | cmd->se_cmd.data_length); |
e48354ce NB |
182 | transport_send_check_condition_and_sense(&cmd->se_cmd, |
183 | TCM_INCORRECT_AMOUNT_OF_DATA, 0); | |
184 | return DATAOUT_CANNOT_RECOVER; | |
185 | } | |
186 | } else { | |
187 | if (first_burst_len == conn->sess->sess_ops->FirstBurstLength) { | |
188 | pr_err("Command ITT: 0x%08x reached" | |
189 | " FirstBurstLength: %u, but ISCSI_FLAG_CMD_FINAL is not set. protocol" | |
190 | " error.\n", cmd->init_task_tag, | |
191 | conn->sess->sess_ops->FirstBurstLength); | |
192 | return DATAOUT_CANNOT_RECOVER; | |
193 | } | |
ebf1d95c | 194 | if (first_burst_len == cmd->se_cmd.data_length) { |
e48354ce NB |
195 | pr_err("Command ITT: 0x%08x reached" |
196 | " ExpXferLen: %u, but ISCSI_FLAG_CMD_FINAL is not set. protocol" | |
ebf1d95c | 197 | " error.\n", cmd->init_task_tag, cmd->se_cmd.data_length); |
e48354ce NB |
198 | return DATAOUT_CANNOT_RECOVER; |
199 | } | |
200 | } | |
201 | ||
202 | out: | |
203 | return DATAOUT_NORMAL; | |
204 | } | |
205 | ||
206 | static int iscsit_dataout_check_sequence( | |
207 | struct iscsi_cmd *cmd, | |
208 | unsigned char *buf) | |
209 | { | |
210 | u32 next_burst_len; | |
211 | struct iscsi_conn *conn = cmd->conn; | |
212 | struct iscsi_seq *seq = NULL; | |
213 | struct iscsi_data *hdr = (struct iscsi_data *) buf; | |
214 | u32 payload_length = ntoh24(hdr->dlength); | |
215 | ||
216 | /* | |
217 | * For DataSequenceInOrder=Yes: Check that the offset and offset+length | |
218 | * is within range as defined by iscsi_set_dataout_sequence_values(). | |
219 | * | |
220 | * For DataSequenceInOrder=No: Check that an struct iscsi_seq exists for | |
221 | * offset+length tuple. | |
222 | */ | |
223 | if (conn->sess->sess_ops->DataSequenceInOrder) { | |
224 | /* | |
225 | * Due to possibility of recovery DataOUT sent by the initiator | |
226 | * fullfilling an Recovery R2T, it's best to just dump the | |
227 | * payload here, instead of erroring out. | |
228 | */ | |
50e5c87d CH |
229 | if ((be32_to_cpu(hdr->offset) < cmd->seq_start_offset) || |
230 | ((be32_to_cpu(hdr->offset) + payload_length) > cmd->seq_end_offset)) { | |
e48354ce NB |
231 | pr_err("Command ITT: 0x%08x with Offset: %u," |
232 | " Length: %u outside of Sequence %u:%u while" | |
233 | " DataSequenceInOrder=Yes.\n", cmd->init_task_tag, | |
50e5c87d | 234 | be32_to_cpu(hdr->offset), payload_length, cmd->seq_start_offset, |
e48354ce NB |
235 | cmd->seq_end_offset); |
236 | ||
237 | if (iscsit_dump_data_payload(conn, payload_length, 1) < 0) | |
238 | return DATAOUT_CANNOT_RECOVER; | |
239 | return DATAOUT_WITHIN_COMMAND_RECOVERY; | |
240 | } | |
241 | ||
242 | next_burst_len = (cmd->next_burst_len + payload_length); | |
243 | } else { | |
50e5c87d CH |
244 | seq = iscsit_get_seq_holder(cmd, be32_to_cpu(hdr->offset), |
245 | payload_length); | |
e48354ce NB |
246 | if (!seq) |
247 | return DATAOUT_CANNOT_RECOVER; | |
248 | /* | |
249 | * Set the struct iscsi_seq pointer to reuse later. | |
250 | */ | |
251 | cmd->seq_ptr = seq; | |
252 | ||
253 | if (seq->status == DATAOUT_SEQUENCE_COMPLETE) { | |
254 | if (iscsit_dump_data_payload(conn, payload_length, 1) < 0) | |
255 | return DATAOUT_CANNOT_RECOVER; | |
256 | return DATAOUT_WITHIN_COMMAND_RECOVERY; | |
257 | } | |
258 | ||
259 | next_burst_len = (seq->next_burst_len + payload_length); | |
260 | } | |
261 | ||
262 | if (next_burst_len > conn->sess->sess_ops->MaxBurstLength) { | |
263 | pr_err("Command ITT: 0x%08x, NextBurstLength: %u and" | |
264 | " Length: %u exceeds MaxBurstLength: %u. protocol" | |
265 | " error.\n", cmd->init_task_tag, | |
266 | (next_burst_len - payload_length), | |
267 | payload_length, conn->sess->sess_ops->MaxBurstLength); | |
268 | return DATAOUT_CANNOT_RECOVER; | |
269 | } | |
270 | ||
271 | /* | |
272 | * Perform various MaxBurstLength and ISCSI_FLAG_CMD_FINAL sanity | |
273 | * checks for the current DataOUT Sequence. | |
274 | */ | |
275 | if (hdr->flags & ISCSI_FLAG_CMD_FINAL) { | |
276 | /* | |
277 | * Ignore ISCSI_FLAG_CMD_FINAL checks while DataPDUInOrder=No, end of | |
278 | * sequence checks are handled in | |
279 | * iscsit_dataout_datapduinorder_no_fbit(). | |
280 | */ | |
281 | if (!conn->sess->sess_ops->DataPDUInOrder) | |
282 | goto out; | |
283 | ||
284 | if (conn->sess->sess_ops->DataSequenceInOrder) { | |
285 | if ((next_burst_len < | |
286 | conn->sess->sess_ops->MaxBurstLength) && | |
287 | ((cmd->write_data_done + payload_length) < | |
ebf1d95c | 288 | cmd->se_cmd.data_length)) { |
e48354ce NB |
289 | pr_err("Command ITT: 0x%08x set ISCSI_FLAG_CMD_FINAL" |
290 | " before end of DataOUT sequence, protocol" | |
291 | " error.\n", cmd->init_task_tag); | |
292 | return DATAOUT_CANNOT_RECOVER; | |
293 | } | |
294 | } else { | |
295 | if (next_burst_len < seq->xfer_len) { | |
296 | pr_err("Command ITT: 0x%08x set ISCSI_FLAG_CMD_FINAL" | |
297 | " before end of DataOUT sequence, protocol" | |
298 | " error.\n", cmd->init_task_tag); | |
299 | return DATAOUT_CANNOT_RECOVER; | |
300 | } | |
301 | } | |
302 | } else { | |
303 | if (conn->sess->sess_ops->DataSequenceInOrder) { | |
304 | if (next_burst_len == | |
305 | conn->sess->sess_ops->MaxBurstLength) { | |
306 | pr_err("Command ITT: 0x%08x reached" | |
307 | " MaxBurstLength: %u, but ISCSI_FLAG_CMD_FINAL is" | |
308 | " not set, protocol error.", cmd->init_task_tag, | |
309 | conn->sess->sess_ops->MaxBurstLength); | |
310 | return DATAOUT_CANNOT_RECOVER; | |
311 | } | |
312 | if ((cmd->write_data_done + payload_length) == | |
ebf1d95c | 313 | cmd->se_cmd.data_length) { |
e48354ce NB |
314 | pr_err("Command ITT: 0x%08x reached" |
315 | " last DataOUT PDU in sequence but ISCSI_FLAG_" | |
316 | "CMD_FINAL is not set, protocol error.\n", | |
317 | cmd->init_task_tag); | |
318 | return DATAOUT_CANNOT_RECOVER; | |
319 | } | |
320 | } else { | |
321 | if (next_burst_len == seq->xfer_len) { | |
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 | } | |
329 | } | |
330 | ||
331 | out: | |
332 | return DATAOUT_NORMAL; | |
333 | } | |
334 | ||
335 | static int iscsit_dataout_check_datasn( | |
336 | struct iscsi_cmd *cmd, | |
337 | unsigned char *buf) | |
338 | { | |
e48354ce NB |
339 | u32 data_sn = 0; |
340 | struct iscsi_conn *conn = cmd->conn; | |
341 | struct iscsi_data *hdr = (struct iscsi_data *) buf; | |
342 | u32 payload_length = ntoh24(hdr->dlength); | |
343 | ||
344 | /* | |
345 | * Considering the target has no method of re-requesting DataOUT | |
346 | * by DataSN, if we receieve a greater DataSN than expected we | |
347 | * assume the functions for DataPDUInOrder=[Yes,No] below will | |
348 | * handle it. | |
349 | * | |
350 | * If the DataSN is less than expected, dump the payload. | |
351 | */ | |
352 | if (conn->sess->sess_ops->DataSequenceInOrder) | |
353 | data_sn = cmd->data_sn; | |
354 | else { | |
355 | struct iscsi_seq *seq = cmd->seq_ptr; | |
356 | data_sn = seq->data_sn; | |
357 | } | |
358 | ||
50e5c87d | 359 | if (be32_to_cpu(hdr->datasn) > data_sn) { |
e48354ce NB |
360 | pr_err("Command ITT: 0x%08x, received DataSN: 0x%08x" |
361 | " higher than expected 0x%08x.\n", cmd->init_task_tag, | |
50e5c87d | 362 | be32_to_cpu(hdr->datasn), data_sn); |
e48354ce | 363 | goto recover; |
50e5c87d | 364 | } else if (be32_to_cpu(hdr->datasn) < data_sn) { |
e48354ce NB |
365 | pr_err("Command ITT: 0x%08x, received DataSN: 0x%08x" |
366 | " lower than expected 0x%08x, discarding payload.\n", | |
50e5c87d | 367 | cmd->init_task_tag, be32_to_cpu(hdr->datasn), data_sn); |
e48354ce NB |
368 | goto dump; |
369 | } | |
370 | ||
371 | return DATAOUT_NORMAL; | |
372 | ||
373 | recover: | |
374 | if (!conn->sess->sess_ops->ErrorRecoveryLevel) { | |
375 | pr_err("Unable to perform within-command recovery" | |
376 | " while ERL=0.\n"); | |
377 | return DATAOUT_CANNOT_RECOVER; | |
378 | } | |
379 | dump: | |
380 | if (iscsit_dump_data_payload(conn, payload_length, 1) < 0) | |
381 | return DATAOUT_CANNOT_RECOVER; | |
382 | ||
5c22e229 | 383 | return DATAOUT_WITHIN_COMMAND_RECOVERY; |
e48354ce NB |
384 | } |
385 | ||
386 | static int iscsit_dataout_pre_datapduinorder_yes( | |
387 | struct iscsi_cmd *cmd, | |
388 | unsigned char *buf) | |
389 | { | |
390 | int dump = 0, recovery = 0; | |
391 | struct iscsi_conn *conn = cmd->conn; | |
392 | struct iscsi_data *hdr = (struct iscsi_data *) buf; | |
393 | u32 payload_length = ntoh24(hdr->dlength); | |
394 | ||
395 | /* | |
396 | * For DataSequenceInOrder=Yes: If the offset is greater than the global | |
397 | * DataPDUInOrder=Yes offset counter in struct iscsi_cmd a protcol error has | |
20879696 | 398 | * occurred and fail the connection. |
e48354ce NB |
399 | * |
400 | * For DataSequenceInOrder=No: If the offset is greater than the per | |
401 | * sequence DataPDUInOrder=Yes offset counter in struct iscsi_seq a protocol | |
20879696 | 402 | * error has occurred and fail the connection. |
e48354ce NB |
403 | */ |
404 | if (conn->sess->sess_ops->DataSequenceInOrder) { | |
50e5c87d | 405 | if (be32_to_cpu(hdr->offset) != cmd->write_data_done) { |
e48354ce NB |
406 | pr_err("Command ITT: 0x%08x, received offset" |
407 | " %u different than expected %u.\n", cmd->init_task_tag, | |
50e5c87d | 408 | be32_to_cpu(hdr->offset), cmd->write_data_done); |
e48354ce NB |
409 | recovery = 1; |
410 | goto recover; | |
411 | } | |
412 | } else { | |
413 | struct iscsi_seq *seq = cmd->seq_ptr; | |
414 | ||
50e5c87d | 415 | if (be32_to_cpu(hdr->offset) > seq->offset) { |
e48354ce NB |
416 | pr_err("Command ITT: 0x%08x, received offset" |
417 | " %u greater than expected %u.\n", cmd->init_task_tag, | |
50e5c87d | 418 | be32_to_cpu(hdr->offset), seq->offset); |
e48354ce NB |
419 | recovery = 1; |
420 | goto recover; | |
50e5c87d | 421 | } else if (be32_to_cpu(hdr->offset) < seq->offset) { |
e48354ce NB |
422 | pr_err("Command ITT: 0x%08x, received offset" |
423 | " %u less than expected %u, discarding payload.\n", | |
50e5c87d CH |
424 | cmd->init_task_tag, be32_to_cpu(hdr->offset), |
425 | seq->offset); | |
e48354ce NB |
426 | dump = 1; |
427 | goto dump; | |
428 | } | |
429 | } | |
430 | ||
431 | return DATAOUT_NORMAL; | |
432 | ||
433 | recover: | |
434 | if (!conn->sess->sess_ops->ErrorRecoveryLevel) { | |
435 | pr_err("Unable to perform within-command recovery" | |
436 | " while ERL=0.\n"); | |
437 | return DATAOUT_CANNOT_RECOVER; | |
438 | } | |
439 | dump: | |
440 | if (iscsit_dump_data_payload(conn, payload_length, 1) < 0) | |
441 | return DATAOUT_CANNOT_RECOVER; | |
442 | ||
443 | return (recovery) ? iscsit_recover_dataout_sequence(cmd, | |
50e5c87d | 444 | be32_to_cpu(hdr->offset), payload_length) : |
e48354ce NB |
445 | (dump) ? DATAOUT_WITHIN_COMMAND_RECOVERY : DATAOUT_NORMAL; |
446 | } | |
447 | ||
448 | static int iscsit_dataout_pre_datapduinorder_no( | |
449 | struct iscsi_cmd *cmd, | |
450 | unsigned char *buf) | |
451 | { | |
452 | struct iscsi_pdu *pdu; | |
453 | struct iscsi_data *hdr = (struct iscsi_data *) buf; | |
454 | u32 payload_length = ntoh24(hdr->dlength); | |
455 | ||
50e5c87d CH |
456 | pdu = iscsit_get_pdu_holder(cmd, be32_to_cpu(hdr->offset), |
457 | payload_length); | |
e48354ce NB |
458 | if (!pdu) |
459 | return DATAOUT_CANNOT_RECOVER; | |
460 | ||
461 | cmd->pdu_ptr = pdu; | |
462 | ||
463 | switch (pdu->status) { | |
464 | case ISCSI_PDU_NOT_RECEIVED: | |
465 | case ISCSI_PDU_CRC_FAILED: | |
466 | case ISCSI_PDU_TIMED_OUT: | |
467 | break; | |
468 | case ISCSI_PDU_RECEIVED_OK: | |
469 | pr_err("Command ITT: 0x%08x received already gotten" | |
470 | " Offset: %u, Length: %u\n", cmd->init_task_tag, | |
50e5c87d | 471 | be32_to_cpu(hdr->offset), payload_length); |
e48354ce NB |
472 | return iscsit_dump_data_payload(cmd->conn, payload_length, 1); |
473 | default: | |
474 | return DATAOUT_CANNOT_RECOVER; | |
475 | } | |
476 | ||
477 | return DATAOUT_NORMAL; | |
478 | } | |
479 | ||
480 | static int iscsit_dataout_update_r2t(struct iscsi_cmd *cmd, u32 offset, u32 length) | |
481 | { | |
482 | struct iscsi_r2t *r2t; | |
483 | ||
484 | if (cmd->unsolicited_data) | |
485 | return 0; | |
486 | ||
487 | r2t = iscsit_get_r2t_for_eos(cmd, offset, length); | |
488 | if (!r2t) | |
489 | return -1; | |
490 | ||
491 | spin_lock_bh(&cmd->r2t_lock); | |
492 | r2t->seq_complete = 1; | |
493 | cmd->outstanding_r2ts--; | |
494 | spin_unlock_bh(&cmd->r2t_lock); | |
495 | ||
496 | return 0; | |
497 | } | |
498 | ||
499 | static int iscsit_dataout_update_datapduinorder_no( | |
500 | struct iscsi_cmd *cmd, | |
501 | u32 data_sn, | |
502 | int f_bit) | |
503 | { | |
504 | int ret = 0; | |
505 | struct iscsi_pdu *pdu = cmd->pdu_ptr; | |
506 | ||
507 | pdu->data_sn = data_sn; | |
508 | ||
509 | switch (pdu->status) { | |
510 | case ISCSI_PDU_NOT_RECEIVED: | |
511 | pdu->status = ISCSI_PDU_RECEIVED_OK; | |
512 | break; | |
513 | case ISCSI_PDU_CRC_FAILED: | |
514 | pdu->status = ISCSI_PDU_RECEIVED_OK; | |
515 | break; | |
516 | case ISCSI_PDU_TIMED_OUT: | |
517 | pdu->status = ISCSI_PDU_RECEIVED_OK; | |
518 | break; | |
519 | default: | |
520 | return DATAOUT_CANNOT_RECOVER; | |
521 | } | |
522 | ||
523 | if (f_bit) { | |
524 | ret = iscsit_dataout_datapduinorder_no_fbit(cmd, pdu); | |
525 | if (ret == DATAOUT_CANNOT_RECOVER) | |
526 | return ret; | |
527 | } | |
528 | ||
529 | return DATAOUT_NORMAL; | |
530 | } | |
531 | ||
532 | static int iscsit_dataout_post_crc_passed( | |
533 | struct iscsi_cmd *cmd, | |
534 | unsigned char *buf) | |
535 | { | |
536 | int ret, send_r2t = 0; | |
537 | struct iscsi_conn *conn = cmd->conn; | |
538 | struct iscsi_seq *seq = NULL; | |
539 | struct iscsi_data *hdr = (struct iscsi_data *) buf; | |
540 | u32 payload_length = ntoh24(hdr->dlength); | |
541 | ||
542 | if (cmd->unsolicited_data) { | |
543 | if ((cmd->first_burst_len + payload_length) == | |
544 | conn->sess->sess_ops->FirstBurstLength) { | |
50e5c87d | 545 | if (iscsit_dataout_update_r2t(cmd, be32_to_cpu(hdr->offset), |
e48354ce NB |
546 | payload_length) < 0) |
547 | return DATAOUT_CANNOT_RECOVER; | |
548 | send_r2t = 1; | |
549 | } | |
550 | ||
551 | if (!conn->sess->sess_ops->DataPDUInOrder) { | |
552 | ret = iscsit_dataout_update_datapduinorder_no(cmd, | |
50e5c87d CH |
553 | be32_to_cpu(hdr->datasn), |
554 | (hdr->flags & ISCSI_FLAG_CMD_FINAL)); | |
e48354ce NB |
555 | if (ret == DATAOUT_CANNOT_RECOVER) |
556 | return ret; | |
557 | } | |
558 | ||
559 | cmd->first_burst_len += payload_length; | |
560 | ||
561 | if (conn->sess->sess_ops->DataSequenceInOrder) | |
562 | cmd->data_sn++; | |
563 | else { | |
564 | seq = cmd->seq_ptr; | |
565 | seq->data_sn++; | |
566 | seq->offset += payload_length; | |
567 | } | |
568 | ||
569 | if (send_r2t) { | |
570 | if (seq) | |
571 | seq->status = DATAOUT_SEQUENCE_COMPLETE; | |
572 | cmd->first_burst_len = 0; | |
573 | cmd->unsolicited_data = 0; | |
574 | } | |
575 | } else { | |
576 | if (conn->sess->sess_ops->DataSequenceInOrder) { | |
577 | if ((cmd->next_burst_len + payload_length) == | |
578 | conn->sess->sess_ops->MaxBurstLength) { | |
50e5c87d CH |
579 | if (iscsit_dataout_update_r2t(cmd, |
580 | be32_to_cpu(hdr->offset), | |
e48354ce NB |
581 | payload_length) < 0) |
582 | return DATAOUT_CANNOT_RECOVER; | |
583 | send_r2t = 1; | |
584 | } | |
585 | ||
586 | if (!conn->sess->sess_ops->DataPDUInOrder) { | |
587 | ret = iscsit_dataout_update_datapduinorder_no( | |
50e5c87d | 588 | cmd, be32_to_cpu(hdr->datasn), |
e48354ce NB |
589 | (hdr->flags & ISCSI_FLAG_CMD_FINAL)); |
590 | if (ret == DATAOUT_CANNOT_RECOVER) | |
591 | return ret; | |
592 | } | |
593 | ||
594 | cmd->next_burst_len += payload_length; | |
595 | cmd->data_sn++; | |
596 | ||
597 | if (send_r2t) | |
598 | cmd->next_burst_len = 0; | |
599 | } else { | |
600 | seq = cmd->seq_ptr; | |
601 | ||
602 | if ((seq->next_burst_len + payload_length) == | |
603 | seq->xfer_len) { | |
50e5c87d CH |
604 | if (iscsit_dataout_update_r2t(cmd, |
605 | be32_to_cpu(hdr->offset), | |
e48354ce NB |
606 | payload_length) < 0) |
607 | return DATAOUT_CANNOT_RECOVER; | |
608 | send_r2t = 1; | |
609 | } | |
610 | ||
611 | if (!conn->sess->sess_ops->DataPDUInOrder) { | |
612 | ret = iscsit_dataout_update_datapduinorder_no( | |
50e5c87d | 613 | cmd, be32_to_cpu(hdr->datasn), |
e48354ce NB |
614 | (hdr->flags & ISCSI_FLAG_CMD_FINAL)); |
615 | if (ret == DATAOUT_CANNOT_RECOVER) | |
616 | return ret; | |
617 | } | |
618 | ||
619 | seq->data_sn++; | |
620 | seq->offset += payload_length; | |
621 | seq->next_burst_len += payload_length; | |
622 | ||
623 | if (send_r2t) { | |
624 | seq->next_burst_len = 0; | |
625 | seq->status = DATAOUT_SEQUENCE_COMPLETE; | |
626 | } | |
627 | } | |
628 | } | |
629 | ||
630 | if (send_r2t && conn->sess->sess_ops->DataSequenceInOrder) | |
631 | cmd->data_sn = 0; | |
632 | ||
633 | cmd->write_data_done += payload_length; | |
634 | ||
ebf1d95c | 635 | if (cmd->write_data_done == cmd->se_cmd.data_length) |
c6037cc5 AG |
636 | return DATAOUT_SEND_TO_TRANSPORT; |
637 | else if (send_r2t) | |
638 | return DATAOUT_SEND_R2T; | |
639 | else | |
640 | return DATAOUT_NORMAL; | |
e48354ce NB |
641 | } |
642 | ||
643 | static int iscsit_dataout_post_crc_failed( | |
644 | struct iscsi_cmd *cmd, | |
645 | unsigned char *buf) | |
646 | { | |
647 | struct iscsi_conn *conn = cmd->conn; | |
648 | struct iscsi_pdu *pdu; | |
649 | struct iscsi_data *hdr = (struct iscsi_data *) buf; | |
650 | u32 payload_length = ntoh24(hdr->dlength); | |
651 | ||
652 | if (conn->sess->sess_ops->DataPDUInOrder) | |
653 | goto recover; | |
654 | /* | |
655 | * The rest of this function is only called when DataPDUInOrder=No. | |
656 | */ | |
657 | pdu = cmd->pdu_ptr; | |
658 | ||
659 | switch (pdu->status) { | |
660 | case ISCSI_PDU_NOT_RECEIVED: | |
661 | pdu->status = ISCSI_PDU_CRC_FAILED; | |
662 | break; | |
663 | case ISCSI_PDU_CRC_FAILED: | |
664 | break; | |
665 | case ISCSI_PDU_TIMED_OUT: | |
666 | pdu->status = ISCSI_PDU_CRC_FAILED; | |
667 | break; | |
668 | default: | |
669 | return DATAOUT_CANNOT_RECOVER; | |
670 | } | |
671 | ||
672 | recover: | |
50e5c87d CH |
673 | return iscsit_recover_dataout_sequence(cmd, be32_to_cpu(hdr->offset), |
674 | payload_length); | |
e48354ce NB |
675 | } |
676 | ||
677 | /* | |
678 | * Called from iscsit_handle_data_out() before DataOUT Payload is received | |
679 | * and CRC computed. | |
680 | */ | |
fceb5bc7 | 681 | int iscsit_check_pre_dataout( |
e48354ce NB |
682 | struct iscsi_cmd *cmd, |
683 | unsigned char *buf) | |
684 | { | |
685 | int ret; | |
686 | struct iscsi_conn *conn = cmd->conn; | |
687 | ||
688 | ret = iscsit_dataout_within_command_recovery_check(cmd, buf); | |
689 | if ((ret == DATAOUT_WITHIN_COMMAND_RECOVERY) || | |
690 | (ret == DATAOUT_CANNOT_RECOVER)) | |
691 | return ret; | |
692 | ||
693 | ret = iscsit_dataout_check_datasn(cmd, buf); | |
694 | if ((ret == DATAOUT_WITHIN_COMMAND_RECOVERY) || | |
695 | (ret == DATAOUT_CANNOT_RECOVER)) | |
696 | return ret; | |
697 | ||
698 | if (cmd->unsolicited_data) { | |
699 | ret = iscsit_dataout_check_unsolicited_sequence(cmd, buf); | |
700 | if ((ret == DATAOUT_WITHIN_COMMAND_RECOVERY) || | |
701 | (ret == DATAOUT_CANNOT_RECOVER)) | |
702 | return ret; | |
703 | } else { | |
704 | ret = iscsit_dataout_check_sequence(cmd, buf); | |
705 | if ((ret == DATAOUT_WITHIN_COMMAND_RECOVERY) || | |
706 | (ret == DATAOUT_CANNOT_RECOVER)) | |
707 | return ret; | |
708 | } | |
709 | ||
710 | return (conn->sess->sess_ops->DataPDUInOrder) ? | |
711 | iscsit_dataout_pre_datapduinorder_yes(cmd, buf) : | |
712 | iscsit_dataout_pre_datapduinorder_no(cmd, buf); | |
713 | } | |
714 | ||
715 | /* | |
716 | * Called from iscsit_handle_data_out() after DataOUT Payload is received | |
717 | * and CRC computed. | |
718 | */ | |
719 | int iscsit_check_post_dataout( | |
720 | struct iscsi_cmd *cmd, | |
721 | unsigned char *buf, | |
722 | u8 data_crc_failed) | |
723 | { | |
724 | struct iscsi_conn *conn = cmd->conn; | |
725 | ||
726 | cmd->dataout_timeout_retries = 0; | |
727 | ||
728 | if (!data_crc_failed) | |
729 | return iscsit_dataout_post_crc_passed(cmd, buf); | |
730 | else { | |
731 | if (!conn->sess->sess_ops->ErrorRecoveryLevel) { | |
732 | pr_err("Unable to recover from DataOUT CRC" | |
733 | " failure while ERL=0, closing session.\n"); | |
ba159914 NB |
734 | iscsit_reject_cmd(cmd, ISCSI_REASON_DATA_DIGEST_ERROR, |
735 | buf); | |
e48354ce NB |
736 | return DATAOUT_CANNOT_RECOVER; |
737 | } | |
738 | ||
ba159914 | 739 | iscsit_reject_cmd(cmd, ISCSI_REASON_DATA_DIGEST_ERROR, buf); |
e48354ce NB |
740 | return iscsit_dataout_post_crc_failed(cmd, buf); |
741 | } | |
742 | } | |
743 | ||
f7c9564a | 744 | void iscsit_handle_time2retain_timeout(struct timer_list *t) |
e48354ce | 745 | { |
f7c9564a | 746 | struct iscsi_session *sess = from_timer(sess, t, time2retain_timer); |
60bfcf8e | 747 | struct iscsi_portal_group *tpg = sess->tpg; |
e48354ce NB |
748 | struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; |
749 | ||
750 | spin_lock_bh(&se_tpg->session_lock); | |
751 | if (sess->time2retain_timer_flags & ISCSI_TF_STOP) { | |
752 | spin_unlock_bh(&se_tpg->session_lock); | |
753 | return; | |
754 | } | |
755 | if (atomic_read(&sess->session_reinstatement)) { | |
756 | pr_err("Exiting Time2Retain handler because" | |
757 | " session_reinstatement=1\n"); | |
758 | spin_unlock_bh(&se_tpg->session_lock); | |
759 | return; | |
760 | } | |
761 | sess->time2retain_timer_flags |= ISCSI_TF_EXPIRED; | |
762 | ||
763 | pr_err("Time2Retain timer expired for SID: %u, cleaning up" | |
764 | " iSCSI session.\n", sess->sid); | |
e48354ce | 765 | |
dce6190c | 766 | iscsit_fill_cxn_timeout_err_stats(sess); |
e48354ce | 767 | spin_unlock_bh(&se_tpg->session_lock); |
44f33d0f | 768 | iscsit_close_session(sess); |
e48354ce NB |
769 | } |
770 | ||
fceb5bc7 | 771 | void iscsit_start_time2retain_handler(struct iscsi_session *sess) |
e48354ce NB |
772 | { |
773 | int tpg_active; | |
774 | /* | |
20879696 | 775 | * Only start Time2Retain timer when the associated TPG is still in |
e48354ce NB |
776 | * an ACTIVE (eg: not disabled or shutdown) state. |
777 | */ | |
60bfcf8e AG |
778 | spin_lock(&sess->tpg->tpg_state_lock); |
779 | tpg_active = (sess->tpg->tpg_state == TPG_STATE_ACTIVE); | |
780 | spin_unlock(&sess->tpg->tpg_state_lock); | |
e48354ce NB |
781 | |
782 | if (!tpg_active) | |
783 | return; | |
784 | ||
785 | if (sess->time2retain_timer_flags & ISCSI_TF_RUNNING) | |
786 | return; | |
787 | ||
788 | pr_debug("Starting Time2Retain timer for %u seconds on" | |
789 | " SID: %u\n", sess->sess_ops->DefaultTime2Retain, sess->sid); | |
790 | ||
e48354ce NB |
791 | sess->time2retain_timer_flags &= ~ISCSI_TF_STOP; |
792 | sess->time2retain_timer_flags |= ISCSI_TF_RUNNING; | |
8a47aa9d BVA |
793 | mod_timer(&sess->time2retain_timer, |
794 | jiffies + sess->sess_ops->DefaultTime2Retain * HZ); | |
e48354ce NB |
795 | } |
796 | ||
fceb5bc7 | 797 | int iscsit_stop_time2retain_timer(struct iscsi_session *sess) |
e48354ce | 798 | { |
60bfcf8e | 799 | struct iscsi_portal_group *tpg = sess->tpg; |
e48354ce NB |
800 | struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; |
801 | ||
618baaf7 BVA |
802 | lockdep_assert_held(&se_tpg->session_lock); |
803 | ||
e48354ce NB |
804 | if (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED) |
805 | return -1; | |
806 | ||
807 | if (!(sess->time2retain_timer_flags & ISCSI_TF_RUNNING)) | |
808 | return 0; | |
809 | ||
810 | sess->time2retain_timer_flags |= ISCSI_TF_STOP; | |
574780fd | 811 | spin_unlock(&se_tpg->session_lock); |
e48354ce NB |
812 | |
813 | del_timer_sync(&sess->time2retain_timer); | |
814 | ||
574780fd | 815 | spin_lock(&se_tpg->session_lock); |
e48354ce NB |
816 | sess->time2retain_timer_flags &= ~ISCSI_TF_RUNNING; |
817 | pr_debug("Stopped Time2Retain Timer for SID: %u\n", | |
818 | sess->sid); | |
819 | return 0; | |
820 | } | |
821 | ||
822 | void iscsit_connection_reinstatement_rcfr(struct iscsi_conn *conn) | |
823 | { | |
824 | spin_lock_bh(&conn->state_lock); | |
825 | if (atomic_read(&conn->connection_exit)) { | |
826 | spin_unlock_bh(&conn->state_lock); | |
827 | goto sleep; | |
828 | } | |
829 | ||
830 | if (atomic_read(&conn->transport_failed)) { | |
831 | spin_unlock_bh(&conn->state_lock); | |
832 | goto sleep; | |
833 | } | |
834 | spin_unlock_bh(&conn->state_lock); | |
835 | ||
88dcd2da NB |
836 | if (conn->tx_thread && conn->tx_thread_active) |
837 | send_sig(SIGINT, conn->tx_thread, 1); | |
838 | if (conn->rx_thread && conn->rx_thread_active) | |
839 | send_sig(SIGINT, conn->rx_thread, 1); | |
e48354ce NB |
840 | |
841 | sleep: | |
842 | wait_for_completion(&conn->conn_wait_rcfr_comp); | |
843 | complete(&conn->conn_post_wait_comp); | |
844 | } | |
845 | ||
846 | void iscsit_cause_connection_reinstatement(struct iscsi_conn *conn, int sleep) | |
847 | { | |
848 | spin_lock_bh(&conn->state_lock); | |
849 | if (atomic_read(&conn->connection_exit)) { | |
850 | spin_unlock_bh(&conn->state_lock); | |
851 | return; | |
852 | } | |
853 | ||
854 | if (atomic_read(&conn->transport_failed)) { | |
855 | spin_unlock_bh(&conn->state_lock); | |
856 | return; | |
857 | } | |
858 | ||
859 | if (atomic_read(&conn->connection_reinstatement)) { | |
860 | spin_unlock_bh(&conn->state_lock); | |
861 | return; | |
862 | } | |
863 | ||
88dcd2da NB |
864 | if (conn->tx_thread && conn->tx_thread_active) |
865 | send_sig(SIGINT, conn->tx_thread, 1); | |
866 | if (conn->rx_thread && conn->rx_thread_active) | |
867 | send_sig(SIGINT, conn->rx_thread, 1); | |
e48354ce NB |
868 | |
869 | atomic_set(&conn->connection_reinstatement, 1); | |
870 | if (!sleep) { | |
871 | spin_unlock_bh(&conn->state_lock); | |
872 | return; | |
873 | } | |
874 | ||
875 | atomic_set(&conn->sleep_on_conn_wait_comp, 1); | |
876 | spin_unlock_bh(&conn->state_lock); | |
877 | ||
878 | wait_for_completion(&conn->conn_wait_comp); | |
879 | complete(&conn->conn_post_wait_comp); | |
880 | } | |
b2cb9649 | 881 | EXPORT_SYMBOL(iscsit_cause_connection_reinstatement); |
e48354ce NB |
882 | |
883 | void iscsit_fall_back_to_erl0(struct iscsi_session *sess) | |
884 | { | |
885 | pr_debug("Falling back to ErrorRecoveryLevel=0 for SID:" | |
886 | " %u\n", sess->sid); | |
887 | ||
888 | atomic_set(&sess->session_fall_back_to_erl0, 1); | |
889 | } | |
890 | ||
891 | static void iscsit_handle_connection_cleanup(struct iscsi_conn *conn) | |
892 | { | |
893 | struct iscsi_session *sess = conn->sess; | |
894 | ||
895 | if ((sess->sess_ops->ErrorRecoveryLevel == 2) && | |
896 | !atomic_read(&sess->session_reinstatement) && | |
897 | !atomic_read(&sess->session_fall_back_to_erl0)) | |
898 | iscsit_connection_recovery_transport_reset(conn); | |
899 | else { | |
900 | pr_debug("Performing cleanup for failed iSCSI" | |
901 | " Connection ID: %hu from %s\n", conn->cid, | |
902 | sess->sess_ops->InitiatorName); | |
903 | iscsit_close_connection(conn); | |
904 | } | |
905 | } | |
906 | ||
5e0cf5e6 | 907 | void iscsit_take_action_for_connection_exit(struct iscsi_conn *conn, bool *conn_freed) |
e48354ce | 908 | { |
5e0cf5e6 JY |
909 | *conn_freed = false; |
910 | ||
e48354ce NB |
911 | spin_lock_bh(&conn->state_lock); |
912 | if (atomic_read(&conn->connection_exit)) { | |
913 | spin_unlock_bh(&conn->state_lock); | |
914 | return; | |
915 | } | |
916 | atomic_set(&conn->connection_exit, 1); | |
917 | ||
918 | if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT) { | |
919 | spin_unlock_bh(&conn->state_lock); | |
2a03ee8c | 920 | iscsit_close_connection(conn); |
5e0cf5e6 | 921 | *conn_freed = true; |
e48354ce NB |
922 | return; |
923 | } | |
924 | ||
925 | if (conn->conn_state == TARG_CONN_STATE_CLEANUP_WAIT) { | |
926 | spin_unlock_bh(&conn->state_lock); | |
927 | return; | |
928 | } | |
929 | ||
930 | pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n"); | |
931 | conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT; | |
932 | spin_unlock_bh(&conn->state_lock); | |
933 | ||
934 | iscsit_handle_connection_cleanup(conn); | |
5e0cf5e6 | 935 | *conn_freed = true; |
e48354ce | 936 | } |