1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*******************************************************************************
3 * This file contains the iSCSI Target DataIN value generation functions.
4 *
5 * (c) Copyright 2007-2013 Datera, Inc.
6 *
7 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
8 *
9 ******************************************************************************/
10
11 #include <linux/slab.h>
12 #include <scsi/iscsi_proto.h>
13 #include <target/iscsi/iscsi_target_core.h>
14 #include "iscsi_target_seq_pdu_list.h"
15 #include "iscsi_target_erl1.h"
16 #include "iscsi_target_util.h"
17 #include "iscsi_target.h"
18 #include "iscsi_target_datain_values.h"
19
iscsit_allocate_datain_req(void)20 struct iscsi_datain_req *iscsit_allocate_datain_req(void)
21 {
22 struct iscsi_datain_req *dr;
23
24 dr = kmem_cache_zalloc(lio_dr_cache, GFP_ATOMIC);
25 if (!dr) {
26 pr_err("Unable to allocate memory for"
27 " struct iscsi_datain_req\n");
28 return NULL;
29 }
30 INIT_LIST_HEAD(&dr->cmd_datain_node);
31
32 return dr;
33 }
34
iscsit_attach_datain_req(struct iscsi_cmd * cmd,struct iscsi_datain_req * dr)35 void iscsit_attach_datain_req(struct iscsi_cmd *cmd, struct iscsi_datain_req *dr)
36 {
37 spin_lock(&cmd->datain_lock);
38 list_add_tail(&dr->cmd_datain_node, &cmd->datain_list);
39 spin_unlock(&cmd->datain_lock);
40 }
41
iscsit_free_datain_req(struct iscsi_cmd * cmd,struct iscsi_datain_req * dr)42 void iscsit_free_datain_req(struct iscsi_cmd *cmd, struct iscsi_datain_req *dr)
43 {
44 spin_lock(&cmd->datain_lock);
45 list_del(&dr->cmd_datain_node);
46 spin_unlock(&cmd->datain_lock);
47
48 kmem_cache_free(lio_dr_cache, dr);
49 }
50
iscsit_free_all_datain_reqs(struct iscsi_cmd * cmd)51 void iscsit_free_all_datain_reqs(struct iscsi_cmd *cmd)
52 {
53 struct iscsi_datain_req *dr, *dr_tmp;
54
55 spin_lock(&cmd->datain_lock);
56 list_for_each_entry_safe(dr, dr_tmp, &cmd->datain_list, cmd_datain_node) {
57 list_del(&dr->cmd_datain_node);
58 kmem_cache_free(lio_dr_cache, dr);
59 }
60 spin_unlock(&cmd->datain_lock);
61 }
62
iscsit_get_datain_req(struct iscsi_cmd * cmd)63 struct iscsi_datain_req *iscsit_get_datain_req(struct iscsi_cmd *cmd)
64 {
65 if (list_empty(&cmd->datain_list)) {
66 pr_err("cmd->datain_list is empty for ITT:"
67 " 0x%08x\n", cmd->init_task_tag);
68 return NULL;
69 }
70
71 return list_first_entry(&cmd->datain_list, struct iscsi_datain_req,
72 cmd_datain_node);
73 }
74
75 /*
76 * For Normal and Recovery DataSequenceInOrder=Yes and DataPDUInOrder=Yes.
77 */
iscsit_set_datain_values_yes_and_yes(struct iscsi_cmd * cmd,struct iscsi_datain * datain)78 static struct iscsi_datain_req *iscsit_set_datain_values_yes_and_yes(
79 struct iscsi_cmd *cmd,
80 struct iscsi_datain *datain)
81 {
82 u32 next_burst_len, read_data_done, read_data_left;
83 struct iscsi_conn *conn = cmd->conn;
84 struct iscsi_datain_req *dr;
85
86 dr = iscsit_get_datain_req(cmd);
87 if (!dr)
88 return NULL;
89
90 if (dr->recovery && dr->generate_recovery_values) {
91 if (iscsit_create_recovery_datain_values_datasequenceinorder_yes(
92 cmd, dr) < 0)
93 return NULL;
94
95 dr->generate_recovery_values = 0;
96 }
97
98 next_burst_len = (!dr->recovery) ?
99 cmd->next_burst_len : dr->next_burst_len;
100 read_data_done = (!dr->recovery) ?
101 cmd->read_data_done : dr->read_data_done;
102
103 read_data_left = (cmd->se_cmd.data_length - read_data_done);
104 if (!read_data_left) {
105 pr_err("ITT: 0x%08x read_data_left is zero!\n",
106 cmd->init_task_tag);
107 return NULL;
108 }
109
110 if ((read_data_left <= conn->conn_ops->MaxRecvDataSegmentLength) &&
111 (read_data_left <= (conn->sess->sess_ops->MaxBurstLength -
112 next_burst_len))) {
113 datain->length = read_data_left;
114
115 datain->flags |= (ISCSI_FLAG_CMD_FINAL | ISCSI_FLAG_DATA_STATUS);
116 if (conn->sess->sess_ops->ErrorRecoveryLevel > 0)
117 datain->flags |= ISCSI_FLAG_DATA_ACK;
118 } else {
119 if ((next_burst_len +
120 conn->conn_ops->MaxRecvDataSegmentLength) <
121 conn->sess->sess_ops->MaxBurstLength) {
122 datain->length =
123 conn->conn_ops->MaxRecvDataSegmentLength;
124 next_burst_len += datain->length;
125 } else {
126 datain->length = (conn->sess->sess_ops->MaxBurstLength -
127 next_burst_len);
128 next_burst_len = 0;
129
130 datain->flags |= ISCSI_FLAG_CMD_FINAL;
131 if (conn->sess->sess_ops->ErrorRecoveryLevel > 0)
132 datain->flags |= ISCSI_FLAG_DATA_ACK;
133 }
134 }
135
136 datain->data_sn = (!dr->recovery) ? cmd->data_sn++ : dr->data_sn++;
137 datain->offset = read_data_done;
138
139 if (!dr->recovery) {
140 cmd->next_burst_len = next_burst_len;
141 cmd->read_data_done += datain->length;
142 } else {
143 dr->next_burst_len = next_burst_len;
144 dr->read_data_done += datain->length;
145 }
146
147 if (!dr->recovery) {
148 if (datain->flags & ISCSI_FLAG_DATA_STATUS)
149 dr->dr_complete = DATAIN_COMPLETE_NORMAL;
150
151 return dr;
152 }
153
154 if (!dr->runlength) {
155 if (datain->flags & ISCSI_FLAG_DATA_STATUS) {
156 dr->dr_complete =
157 (dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ?
158 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY :
159 DATAIN_COMPLETE_CONNECTION_RECOVERY;
160 }
161 } else {
162 if ((dr->begrun + dr->runlength) == dr->data_sn) {
163 dr->dr_complete =
164 (dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ?
165 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY :
166 DATAIN_COMPLETE_CONNECTION_RECOVERY;
167 }
168 }
169
170 return dr;
171 }
172
173 /*
174 * For Normal and Recovery DataSequenceInOrder=No and DataPDUInOrder=Yes.
175 */
iscsit_set_datain_values_no_and_yes(struct iscsi_cmd * cmd,struct iscsi_datain * datain)176 static struct iscsi_datain_req *iscsit_set_datain_values_no_and_yes(
177 struct iscsi_cmd *cmd,
178 struct iscsi_datain *datain)
179 {
180 u32 offset, read_data_done, read_data_left, seq_send_order;
181 struct iscsi_conn *conn = cmd->conn;
182 struct iscsi_datain_req *dr;
183 struct iscsi_seq *seq;
184
185 dr = iscsit_get_datain_req(cmd);
186 if (!dr)
187 return NULL;
188
189 if (dr->recovery && dr->generate_recovery_values) {
190 if (iscsit_create_recovery_datain_values_datasequenceinorder_no(
191 cmd, dr) < 0)
192 return NULL;
193
194 dr->generate_recovery_values = 0;
195 }
196
197 read_data_done = (!dr->recovery) ?
198 cmd->read_data_done : dr->read_data_done;
199 seq_send_order = (!dr->recovery) ?
200 cmd->seq_send_order : dr->seq_send_order;
201
202 read_data_left = (cmd->se_cmd.data_length - read_data_done);
203 if (!read_data_left) {
204 pr_err("ITT: 0x%08x read_data_left is zero!\n",
205 cmd->init_task_tag);
206 return NULL;
207 }
208
209 seq = iscsit_get_seq_holder_for_datain(cmd, seq_send_order);
210 if (!seq)
211 return NULL;
212
213 seq->sent = 1;
214
215 if (!dr->recovery && !seq->next_burst_len)
216 seq->first_datasn = cmd->data_sn;
217
218 offset = (seq->offset + seq->next_burst_len);
219
220 if ((offset + conn->conn_ops->MaxRecvDataSegmentLength) >=
221 cmd->se_cmd.data_length) {
222 datain->length = (cmd->se_cmd.data_length - offset);
223 datain->offset = offset;
224
225 datain->flags |= ISCSI_FLAG_CMD_FINAL;
226 if (conn->sess->sess_ops->ErrorRecoveryLevel > 0)
227 datain->flags |= ISCSI_FLAG_DATA_ACK;
228
229 seq->next_burst_len = 0;
230 seq_send_order++;
231 } else {
232 if ((seq->next_burst_len +
233 conn->conn_ops->MaxRecvDataSegmentLength) <
234 conn->sess->sess_ops->MaxBurstLength) {
235 datain->length =
236 conn->conn_ops->MaxRecvDataSegmentLength;
237 datain->offset = (seq->offset + seq->next_burst_len);
238
239 seq->next_burst_len += datain->length;
240 } else {
241 datain->length = (conn->sess->sess_ops->MaxBurstLength -
242 seq->next_burst_len);
243 datain->offset = (seq->offset + seq->next_burst_len);
244
245 datain->flags |= ISCSI_FLAG_CMD_FINAL;
246 if (conn->sess->sess_ops->ErrorRecoveryLevel > 0)
247 datain->flags |= ISCSI_FLAG_DATA_ACK;
248
249 seq->next_burst_len = 0;
250 seq_send_order++;
251 }
252 }
253
254 if ((read_data_done + datain->length) == cmd->se_cmd.data_length)
255 datain->flags |= ISCSI_FLAG_DATA_STATUS;
256
257 datain->data_sn = (!dr->recovery) ? cmd->data_sn++ : dr->data_sn++;
258 if (!dr->recovery) {
259 cmd->seq_send_order = seq_send_order;
260 cmd->read_data_done += datain->length;
261 } else {
262 dr->seq_send_order = seq_send_order;
263 dr->read_data_done += datain->length;
264 }
265
266 if (!dr->recovery) {
267 if (datain->flags & ISCSI_FLAG_CMD_FINAL)
268 seq->last_datasn = datain->data_sn;
269 if (datain->flags & ISCSI_FLAG_DATA_STATUS)
270 dr->dr_complete = DATAIN_COMPLETE_NORMAL;
271
272 return dr;
273 }
274
275 if (!dr->runlength) {
276 if (datain->flags & ISCSI_FLAG_DATA_STATUS) {
277 dr->dr_complete =
278 (dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ?
279 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY :
280 DATAIN_COMPLETE_CONNECTION_RECOVERY;
281 }
282 } else {
283 if ((dr->begrun + dr->runlength) == dr->data_sn) {
284 dr->dr_complete =
285 (dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ?
286 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY :
287 DATAIN_COMPLETE_CONNECTION_RECOVERY;
288 }
289 }
290
291 return dr;
292 }
293
294 /*
295 * For Normal and Recovery DataSequenceInOrder=Yes and DataPDUInOrder=No.
296 */
iscsit_set_datain_values_yes_and_no(struct iscsi_cmd * cmd,struct iscsi_datain * datain)297 static struct iscsi_datain_req *iscsit_set_datain_values_yes_and_no(
298 struct iscsi_cmd *cmd,
299 struct iscsi_datain *datain)
300 {
301 u32 next_burst_len, read_data_done, read_data_left;
302 struct iscsi_conn *conn = cmd->conn;
303 struct iscsi_datain_req *dr;
304 struct iscsi_pdu *pdu;
305
306 dr = iscsit_get_datain_req(cmd);
307 if (!dr)
308 return NULL;
309
310 if (dr->recovery && dr->generate_recovery_values) {
311 if (iscsit_create_recovery_datain_values_datasequenceinorder_yes(
312 cmd, dr) < 0)
313 return NULL;
314
315 dr->generate_recovery_values = 0;
316 }
317
318 next_burst_len = (!dr->recovery) ?
319 cmd->next_burst_len : dr->next_burst_len;
320 read_data_done = (!dr->recovery) ?
321 cmd->read_data_done : dr->read_data_done;
322
323 read_data_left = (cmd->se_cmd.data_length - read_data_done);
324 if (!read_data_left) {
325 pr_err("ITT: 0x%08x read_data_left is zero!\n",
326 cmd->init_task_tag);
327 return dr;
328 }
329
330 pdu = iscsit_get_pdu_holder_for_seq(cmd, NULL);
331 if (!pdu)
332 return dr;
333
334 if ((read_data_done + pdu->length) == cmd->se_cmd.data_length) {
335 pdu->flags |= (ISCSI_FLAG_CMD_FINAL | ISCSI_FLAG_DATA_STATUS);
336 if (conn->sess->sess_ops->ErrorRecoveryLevel > 0)
337 pdu->flags |= ISCSI_FLAG_DATA_ACK;
338
339 next_burst_len = 0;
340 } else {
341 if ((next_burst_len + conn->conn_ops->MaxRecvDataSegmentLength) <
342 conn->sess->sess_ops->MaxBurstLength)
343 next_burst_len += pdu->length;
344 else {
345 pdu->flags |= ISCSI_FLAG_CMD_FINAL;
346 if (conn->sess->sess_ops->ErrorRecoveryLevel > 0)
347 pdu->flags |= ISCSI_FLAG_DATA_ACK;
348
349 next_burst_len = 0;
350 }
351 }
352
353 pdu->data_sn = (!dr->recovery) ? cmd->data_sn++ : dr->data_sn++;
354 if (!dr->recovery) {
355 cmd->next_burst_len = next_burst_len;
356 cmd->read_data_done += pdu->length;
357 } else {
358 dr->next_burst_len = next_burst_len;
359 dr->read_data_done += pdu->length;
360 }
361
362 datain->flags = pdu->flags;
363 datain->length = pdu->length;
364 datain->offset = pdu->offset;
365 datain->data_sn = pdu->data_sn;
366
367 if (!dr->recovery) {
368 if (datain->flags & ISCSI_FLAG_DATA_STATUS)
369 dr->dr_complete = DATAIN_COMPLETE_NORMAL;
370
371 return dr;
372 }
373
374 if (!dr->runlength) {
375 if (datain->flags & ISCSI_FLAG_DATA_STATUS) {
376 dr->dr_complete =
377 (dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ?
378 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY :
379 DATAIN_COMPLETE_CONNECTION_RECOVERY;
380 }
381 } else {
382 if ((dr->begrun + dr->runlength) == dr->data_sn) {
383 dr->dr_complete =
384 (dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ?
385 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY :
386 DATAIN_COMPLETE_CONNECTION_RECOVERY;
387 }
388 }
389
390 return dr;
391 }
392
393 /*
394 * For Normal and Recovery DataSequenceInOrder=No and DataPDUInOrder=No.
395 */
iscsit_set_datain_values_no_and_no(struct iscsi_cmd * cmd,struct iscsi_datain * datain)396 static struct iscsi_datain_req *iscsit_set_datain_values_no_and_no(
397 struct iscsi_cmd *cmd,
398 struct iscsi_datain *datain)
399 {
400 u32 read_data_done, read_data_left, seq_send_order;
401 struct iscsi_conn *conn = cmd->conn;
402 struct iscsi_datain_req *dr;
403 struct iscsi_pdu *pdu;
404 struct iscsi_seq *seq = NULL;
405
406 dr = iscsit_get_datain_req(cmd);
407 if (!dr)
408 return NULL;
409
410 if (dr->recovery && dr->generate_recovery_values) {
411 if (iscsit_create_recovery_datain_values_datasequenceinorder_no(
412 cmd, dr) < 0)
413 return NULL;
414
415 dr->generate_recovery_values = 0;
416 }
417
418 read_data_done = (!dr->recovery) ?
419 cmd->read_data_done : dr->read_data_done;
420 seq_send_order = (!dr->recovery) ?
421 cmd->seq_send_order : dr->seq_send_order;
422
423 read_data_left = (cmd->se_cmd.data_length - read_data_done);
424 if (!read_data_left) {
425 pr_err("ITT: 0x%08x read_data_left is zero!\n",
426 cmd->init_task_tag);
427 return NULL;
428 }
429
430 seq = iscsit_get_seq_holder_for_datain(cmd, seq_send_order);
431 if (!seq)
432 return NULL;
433
434 seq->sent = 1;
435
436 if (!dr->recovery && !seq->next_burst_len)
437 seq->first_datasn = cmd->data_sn;
438
439 pdu = iscsit_get_pdu_holder_for_seq(cmd, seq);
440 if (!pdu)
441 return NULL;
442
443 if (seq->pdu_send_order == seq->pdu_count) {
444 pdu->flags |= ISCSI_FLAG_CMD_FINAL;
445 if (conn->sess->sess_ops->ErrorRecoveryLevel > 0)
446 pdu->flags |= ISCSI_FLAG_DATA_ACK;
447
448 seq->next_burst_len = 0;
449 seq_send_order++;
450 } else
451 seq->next_burst_len += pdu->length;
452
453 if ((read_data_done + pdu->length) == cmd->se_cmd.data_length)
454 pdu->flags |= ISCSI_FLAG_DATA_STATUS;
455
456 pdu->data_sn = (!dr->recovery) ? cmd->data_sn++ : dr->data_sn++;
457 if (!dr->recovery) {
458 cmd->seq_send_order = seq_send_order;
459 cmd->read_data_done += pdu->length;
460 } else {
461 dr->seq_send_order = seq_send_order;
462 dr->read_data_done += pdu->length;
463 }
464
465 datain->flags = pdu->flags;
466 datain->length = pdu->length;
467 datain->offset = pdu->offset;
468 datain->data_sn = pdu->data_sn;
469
470 if (!dr->recovery) {
471 if (datain->flags & ISCSI_FLAG_CMD_FINAL)
472 seq->last_datasn = datain->data_sn;
473 if (datain->flags & ISCSI_FLAG_DATA_STATUS)
474 dr->dr_complete = DATAIN_COMPLETE_NORMAL;
475
476 return dr;
477 }
478
479 if (!dr->runlength) {
480 if (datain->flags & ISCSI_FLAG_DATA_STATUS) {
481 dr->dr_complete =
482 (dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ?
483 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY :
484 DATAIN_COMPLETE_CONNECTION_RECOVERY;
485 }
486 } else {
487 if ((dr->begrun + dr->runlength) == dr->data_sn) {
488 dr->dr_complete =
489 (dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ?
490 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY :
491 DATAIN_COMPLETE_CONNECTION_RECOVERY;
492 }
493 }
494
495 return dr;
496 }
497
iscsit_get_datain_values(struct iscsi_cmd * cmd,struct iscsi_datain * datain)498 struct iscsi_datain_req *iscsit_get_datain_values(
499 struct iscsi_cmd *cmd,
500 struct iscsi_datain *datain)
501 {
502 struct iscsi_conn *conn = cmd->conn;
503
504 if (conn->sess->sess_ops->DataSequenceInOrder &&
505 conn->sess->sess_ops->DataPDUInOrder)
506 return iscsit_set_datain_values_yes_and_yes(cmd, datain);
507 else if (!conn->sess->sess_ops->DataSequenceInOrder &&
508 conn->sess->sess_ops->DataPDUInOrder)
509 return iscsit_set_datain_values_no_and_yes(cmd, datain);
510 else if (conn->sess->sess_ops->DataSequenceInOrder &&
511 !conn->sess->sess_ops->DataPDUInOrder)
512 return iscsit_set_datain_values_yes_and_no(cmd, datain);
513 else if (!conn->sess->sess_ops->DataSequenceInOrder &&
514 !conn->sess->sess_ops->DataPDUInOrder)
515 return iscsit_set_datain_values_no_and_no(cmd, datain);
516
517 return NULL;
518 }
519 EXPORT_SYMBOL(iscsit_get_datain_values);
520
