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1/*******************************************************************************
2 * This file contains the iSCSI Target DataIN value generation functions.
3 *
4 * \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
5 *
6 * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
7 *
8 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 ******************************************************************************/
20
21#include <scsi/iscsi_proto.h>
22
23#include "iscsi_target_core.h"
24#include "iscsi_target_seq_pdu_list.h"
25#include "iscsi_target_erl1.h"
26#include "iscsi_target_util.h"
27#include "iscsi_target.h"
28#include "iscsi_target_datain_values.h"
29
30struct iscsi_datain_req *iscsit_allocate_datain_req(void)
31{
32 struct iscsi_datain_req *dr;
33
34 dr = kmem_cache_zalloc(lio_dr_cache, GFP_ATOMIC);
35 if (!dr) {
36 pr_err("Unable to allocate memory for"
37 " struct iscsi_datain_req\n");
38 return NULL;
39 }
40 INIT_LIST_HEAD(&dr->dr_list);
41
42 return dr;
43}
44
45void iscsit_attach_datain_req(struct iscsi_cmd *cmd, struct iscsi_datain_req *dr)
46{
47 spin_lock(&cmd->datain_lock);
48 list_add_tail(&dr->dr_list, &cmd->datain_list);
49 spin_unlock(&cmd->datain_lock);
50}
51
52void iscsit_free_datain_req(struct iscsi_cmd *cmd, struct iscsi_datain_req *dr)
53{
54 spin_lock(&cmd->datain_lock);
55 list_del(&dr->dr_list);
56 spin_unlock(&cmd->datain_lock);
57
58 kmem_cache_free(lio_dr_cache, dr);
59}
60
61void iscsit_free_all_datain_reqs(struct iscsi_cmd *cmd)
62{
63 struct iscsi_datain_req *dr, *dr_tmp;
64
65 spin_lock(&cmd->datain_lock);
66 list_for_each_entry_safe(dr, dr_tmp, &cmd->datain_list, dr_list) {
67 list_del(&dr->dr_list);
68 kmem_cache_free(lio_dr_cache, dr);
69 }
70 spin_unlock(&cmd->datain_lock);
71}
72
73struct iscsi_datain_req *iscsit_get_datain_req(struct iscsi_cmd *cmd)
74{
75 struct iscsi_datain_req *dr;
76
77 if (list_empty(&cmd->datain_list)) {
78 pr_err("cmd->datain_list is empty for ITT:"
79 " 0x%08x\n", cmd->init_task_tag);
80 return NULL;
81 }
82 list_for_each_entry(dr, &cmd->datain_list, dr_list)
83 break;
84
85 return dr;
86}
87
88/*
89 * For Normal and Recovery DataSequenceInOrder=Yes and DataPDUInOrder=Yes.
90 */
91static struct iscsi_datain_req *iscsit_set_datain_values_yes_and_yes(
92 struct iscsi_cmd *cmd,
93 struct iscsi_datain *datain)
94{
95 u32 next_burst_len, read_data_done, read_data_left;
96 struct iscsi_conn *conn = cmd->conn;
97 struct iscsi_datain_req *dr;
98
99 dr = iscsit_get_datain_req(cmd);
100 if (!dr)
101 return NULL;
102
103 if (dr->recovery && dr->generate_recovery_values) {
104 if (iscsit_create_recovery_datain_values_datasequenceinorder_yes(
105 cmd, dr) < 0)
106 return NULL;
107
108 dr->generate_recovery_values = 0;
109 }
110
111 next_burst_len = (!dr->recovery) ?
112 cmd->next_burst_len : dr->next_burst_len;
113 read_data_done = (!dr->recovery) ?
114 cmd->read_data_done : dr->read_data_done;
115
116 read_data_left = (cmd->data_length - read_data_done);
117 if (!read_data_left) {
118 pr_err("ITT: 0x%08x read_data_left is zero!\n",
119 cmd->init_task_tag);
120 return NULL;
121 }
122
123 if ((read_data_left <= conn->conn_ops->MaxRecvDataSegmentLength) &&
124 (read_data_left <= (conn->sess->sess_ops->MaxBurstLength -
125 next_burst_len))) {
126 datain->length = read_data_left;
127
128 datain->flags |= (ISCSI_FLAG_CMD_FINAL | ISCSI_FLAG_DATA_STATUS);
129 if (conn->sess->sess_ops->ErrorRecoveryLevel > 0)
130 datain->flags |= ISCSI_FLAG_DATA_ACK;
131 } else {
132 if ((next_burst_len +
133 conn->conn_ops->MaxRecvDataSegmentLength) <
134 conn->sess->sess_ops->MaxBurstLength) {
135 datain->length =
136 conn->conn_ops->MaxRecvDataSegmentLength;
137 next_burst_len += datain->length;
138 } else {
139 datain->length = (conn->sess->sess_ops->MaxBurstLength -
140 next_burst_len);
141 next_burst_len = 0;
142
143 datain->flags |= ISCSI_FLAG_CMD_FINAL;
144 if (conn->sess->sess_ops->ErrorRecoveryLevel > 0)
145 datain->flags |= ISCSI_FLAG_DATA_ACK;
146 }
147 }
148
149 datain->data_sn = (!dr->recovery) ? cmd->data_sn++ : dr->data_sn++;
150 datain->offset = read_data_done;
151
152 if (!dr->recovery) {
153 cmd->next_burst_len = next_burst_len;
154 cmd->read_data_done += datain->length;
155 } else {
156 dr->next_burst_len = next_burst_len;
157 dr->read_data_done += datain->length;
158 }
159
160 if (!dr->recovery) {
161 if (datain->flags & ISCSI_FLAG_DATA_STATUS)
162 dr->dr_complete = DATAIN_COMPLETE_NORMAL;
163
164 return dr;
165 }
166
167 if (!dr->runlength) {
168 if (datain->flags & ISCSI_FLAG_DATA_STATUS) {
169 dr->dr_complete =
170 (dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ?
171 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY :
172 DATAIN_COMPLETE_CONNECTION_RECOVERY;
173 }
174 } else {
175 if ((dr->begrun + dr->runlength) == dr->data_sn) {
176 dr->dr_complete =
177 (dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ?
178 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY :
179 DATAIN_COMPLETE_CONNECTION_RECOVERY;
180 }
181 }
182
183 return dr;
184}
185
186/*
187 * For Normal and Recovery DataSequenceInOrder=No and DataPDUInOrder=Yes.
188 */
189static struct iscsi_datain_req *iscsit_set_datain_values_no_and_yes(
190 struct iscsi_cmd *cmd,
191 struct iscsi_datain *datain)
192{
193 u32 offset, read_data_done, read_data_left, seq_send_order;
194 struct iscsi_conn *conn = cmd->conn;
195 struct iscsi_datain_req *dr;
196 struct iscsi_seq *seq;
197
198 dr = iscsit_get_datain_req(cmd);
199 if (!dr)
200 return NULL;
201
202 if (dr->recovery && dr->generate_recovery_values) {
203 if (iscsit_create_recovery_datain_values_datasequenceinorder_no(
204 cmd, dr) < 0)
205 return NULL;
206
207 dr->generate_recovery_values = 0;
208 }
209
210 read_data_done = (!dr->recovery) ?
211 cmd->read_data_done : dr->read_data_done;
212 seq_send_order = (!dr->recovery) ?
213 cmd->seq_send_order : dr->seq_send_order;
214
215 read_data_left = (cmd->data_length - read_data_done);
216 if (!read_data_left) {
217 pr_err("ITT: 0x%08x read_data_left is zero!\n",
218 cmd->init_task_tag);
219 return NULL;
220 }
221
222 seq = iscsit_get_seq_holder_for_datain(cmd, seq_send_order);
223 if (!seq)
224 return NULL;
225
226 seq->sent = 1;
227
228 if (!dr->recovery && !seq->next_burst_len)
229 seq->first_datasn = cmd->data_sn;
230
231 offset = (seq->offset + seq->next_burst_len);
232
233 if ((offset + conn->conn_ops->MaxRecvDataSegmentLength) >=
234 cmd->data_length) {
235 datain->length = (cmd->data_length - offset);
236 datain->offset = offset;
237
238 datain->flags |= ISCSI_FLAG_CMD_FINAL;
239 if (conn->sess->sess_ops->ErrorRecoveryLevel > 0)
240 datain->flags |= ISCSI_FLAG_DATA_ACK;
241
242 seq->next_burst_len = 0;
243 seq_send_order++;
244 } else {
245 if ((seq->next_burst_len +
246 conn->conn_ops->MaxRecvDataSegmentLength) <
247 conn->sess->sess_ops->MaxBurstLength) {
248 datain->length =
249 conn->conn_ops->MaxRecvDataSegmentLength;
250 datain->offset = (seq->offset + seq->next_burst_len);
251
252 seq->next_burst_len += datain->length;
253 } else {
254 datain->length = (conn->sess->sess_ops->MaxBurstLength -
255 seq->next_burst_len);
256 datain->offset = (seq->offset + seq->next_burst_len);
257
258 datain->flags |= ISCSI_FLAG_CMD_FINAL;
259 if (conn->sess->sess_ops->ErrorRecoveryLevel > 0)
260 datain->flags |= ISCSI_FLAG_DATA_ACK;
261
262 seq->next_burst_len = 0;
263 seq_send_order++;
264 }
265 }
266
267 if ((read_data_done + datain->length) == cmd->data_length)
268 datain->flags |= ISCSI_FLAG_DATA_STATUS;
269
270 datain->data_sn = (!dr->recovery) ? cmd->data_sn++ : dr->data_sn++;
271 if (!dr->recovery) {
272 cmd->seq_send_order = seq_send_order;
273 cmd->read_data_done += datain->length;
274 } else {
275 dr->seq_send_order = seq_send_order;
276 dr->read_data_done += datain->length;
277 }
278
279 if (!dr->recovery) {
280 if (datain->flags & ISCSI_FLAG_CMD_FINAL)
281 seq->last_datasn = datain->data_sn;
282 if (datain->flags & ISCSI_FLAG_DATA_STATUS)
283 dr->dr_complete = DATAIN_COMPLETE_NORMAL;
284
285 return dr;
286 }
287
288 if (!dr->runlength) {
289 if (datain->flags & ISCSI_FLAG_DATA_STATUS) {
290 dr->dr_complete =
291 (dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ?
292 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY :
293 DATAIN_COMPLETE_CONNECTION_RECOVERY;
294 }
295 } else {
296 if ((dr->begrun + dr->runlength) == dr->data_sn) {
297 dr->dr_complete =
298 (dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ?
299 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY :
300 DATAIN_COMPLETE_CONNECTION_RECOVERY;
301 }
302 }
303
304 return dr;
305}
306
307/*
308 * For Normal and Recovery DataSequenceInOrder=Yes and DataPDUInOrder=No.
309 */
310static struct iscsi_datain_req *iscsit_set_datain_values_yes_and_no(
311 struct iscsi_cmd *cmd,
312 struct iscsi_datain *datain)
313{
314 u32 next_burst_len, read_data_done, read_data_left;
315 struct iscsi_conn *conn = cmd->conn;
316 struct iscsi_datain_req *dr;
317 struct iscsi_pdu *pdu;
318
319 dr = iscsit_get_datain_req(cmd);
320 if (!dr)
321 return NULL;
322
323 if (dr->recovery && dr->generate_recovery_values) {
324 if (iscsit_create_recovery_datain_values_datasequenceinorder_yes(
325 cmd, dr) < 0)
326 return NULL;
327
328 dr->generate_recovery_values = 0;
329 }
330
331 next_burst_len = (!dr->recovery) ?
332 cmd->next_burst_len : dr->next_burst_len;
333 read_data_done = (!dr->recovery) ?
334 cmd->read_data_done : dr->read_data_done;
335
336 read_data_left = (cmd->data_length - read_data_done);
337 if (!read_data_left) {
338 pr_err("ITT: 0x%08x read_data_left is zero!\n",
339 cmd->init_task_tag);
340 return dr;
341 }
342
343 pdu = iscsit_get_pdu_holder_for_seq(cmd, NULL);
344 if (!pdu)
345 return dr;
346
347 if ((read_data_done + pdu->length) == cmd->data_length) {
348 pdu->flags |= (ISCSI_FLAG_CMD_FINAL | ISCSI_FLAG_DATA_STATUS);
349 if (conn->sess->sess_ops->ErrorRecoveryLevel > 0)
350 pdu->flags |= ISCSI_FLAG_DATA_ACK;
351
352 next_burst_len = 0;
353 } else {
354 if ((next_burst_len + conn->conn_ops->MaxRecvDataSegmentLength) <
355 conn->sess->sess_ops->MaxBurstLength)
356 next_burst_len += pdu->length;
357 else {
358 pdu->flags |= ISCSI_FLAG_CMD_FINAL;
359 if (conn->sess->sess_ops->ErrorRecoveryLevel > 0)
360 pdu->flags |= ISCSI_FLAG_DATA_ACK;
361
362 next_burst_len = 0;
363 }
364 }
365
366 pdu->data_sn = (!dr->recovery) ? cmd->data_sn++ : dr->data_sn++;
367 if (!dr->recovery) {
368 cmd->next_burst_len = next_burst_len;
369 cmd->read_data_done += pdu->length;
370 } else {
371 dr->next_burst_len = next_burst_len;
372 dr->read_data_done += pdu->length;
373 }
374
375 datain->flags = pdu->flags;
376 datain->length = pdu->length;
377 datain->offset = pdu->offset;
378 datain->data_sn = pdu->data_sn;
379
380 if (!dr->recovery) {
381 if (datain->flags & ISCSI_FLAG_DATA_STATUS)
382 dr->dr_complete = DATAIN_COMPLETE_NORMAL;
383
384 return dr;
385 }
386
387 if (!dr->runlength) {
388 if (datain->flags & ISCSI_FLAG_DATA_STATUS) {
389 dr->dr_complete =
390 (dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ?
391 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY :
392 DATAIN_COMPLETE_CONNECTION_RECOVERY;
393 }
394 } else {
395 if ((dr->begrun + dr->runlength) == dr->data_sn) {
396 dr->dr_complete =
397 (dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ?
398 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY :
399 DATAIN_COMPLETE_CONNECTION_RECOVERY;
400 }
401 }
402
403 return dr;
404}
405
406/*
407 * For Normal and Recovery DataSequenceInOrder=No and DataPDUInOrder=No.
408 */
409static struct iscsi_datain_req *iscsit_set_datain_values_no_and_no(
410 struct iscsi_cmd *cmd,
411 struct iscsi_datain *datain)
412{
413 u32 read_data_done, read_data_left, seq_send_order;
414 struct iscsi_conn *conn = cmd->conn;
415 struct iscsi_datain_req *dr;
416 struct iscsi_pdu *pdu;
417 struct iscsi_seq *seq = NULL;
418
419 dr = iscsit_get_datain_req(cmd);
420 if (!dr)
421 return NULL;
422
423 if (dr->recovery && dr->generate_recovery_values) {
424 if (iscsit_create_recovery_datain_values_datasequenceinorder_no(
425 cmd, dr) < 0)
426 return NULL;
427
428 dr->generate_recovery_values = 0;
429 }
430
431 read_data_done = (!dr->recovery) ?
432 cmd->read_data_done : dr->read_data_done;
433 seq_send_order = (!dr->recovery) ?
434 cmd->seq_send_order : dr->seq_send_order;
435
436 read_data_left = (cmd->data_length - read_data_done);
437 if (!read_data_left) {
438 pr_err("ITT: 0x%08x read_data_left is zero!\n",
439 cmd->init_task_tag);
440 return NULL;
441 }
442
443 seq = iscsit_get_seq_holder_for_datain(cmd, seq_send_order);
444 if (!seq)
445 return NULL;
446
447 seq->sent = 1;
448
449 if (!dr->recovery && !seq->next_burst_len)
450 seq->first_datasn = cmd->data_sn;
451
452 pdu = iscsit_get_pdu_holder_for_seq(cmd, seq);
453 if (!pdu)
454 return NULL;
455
456 if (seq->pdu_send_order == seq->pdu_count) {
457 pdu->flags |= ISCSI_FLAG_CMD_FINAL;
458 if (conn->sess->sess_ops->ErrorRecoveryLevel > 0)
459 pdu->flags |= ISCSI_FLAG_DATA_ACK;
460
461 seq->next_burst_len = 0;
462 seq_send_order++;
463 } else
464 seq->next_burst_len += pdu->length;
465
466 if ((read_data_done + pdu->length) == cmd->data_length)
467 pdu->flags |= ISCSI_FLAG_DATA_STATUS;
468
469 pdu->data_sn = (!dr->recovery) ? cmd->data_sn++ : dr->data_sn++;
470 if (!dr->recovery) {
471 cmd->seq_send_order = seq_send_order;
472 cmd->read_data_done += pdu->length;
473 } else {
474 dr->seq_send_order = seq_send_order;
475 dr->read_data_done += pdu->length;
476 }
477
478 datain->flags = pdu->flags;
479 datain->length = pdu->length;
480 datain->offset = pdu->offset;
481 datain->data_sn = pdu->data_sn;
482
483 if (!dr->recovery) {
484 if (datain->flags & ISCSI_FLAG_CMD_FINAL)
485 seq->last_datasn = datain->data_sn;
486 if (datain->flags & ISCSI_FLAG_DATA_STATUS)
487 dr->dr_complete = DATAIN_COMPLETE_NORMAL;
488
489 return dr;
490 }
491
492 if (!dr->runlength) {
493 if (datain->flags & ISCSI_FLAG_DATA_STATUS) {
494 dr->dr_complete =
495 (dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ?
496 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY :
497 DATAIN_COMPLETE_CONNECTION_RECOVERY;
498 }
499 } else {
500 if ((dr->begrun + dr->runlength) == dr->data_sn) {
501 dr->dr_complete =
502 (dr->recovery == DATAIN_WITHIN_COMMAND_RECOVERY) ?
503 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY :
504 DATAIN_COMPLETE_CONNECTION_RECOVERY;
505 }
506 }
507
508 return dr;
509}
510
511struct iscsi_datain_req *iscsit_get_datain_values(
512 struct iscsi_cmd *cmd,
513 struct iscsi_datain *datain)
514{
515 struct iscsi_conn *conn = cmd->conn;
516
517 if (conn->sess->sess_ops->DataSequenceInOrder &&
518 conn->sess->sess_ops->DataPDUInOrder)
519 return iscsit_set_datain_values_yes_and_yes(cmd, datain);
520 else if (!conn->sess->sess_ops->DataSequenceInOrder &&
521 conn->sess->sess_ops->DataPDUInOrder)
522 return iscsit_set_datain_values_no_and_yes(cmd, datain);
523 else if (conn->sess->sess_ops->DataSequenceInOrder &&
524 !conn->sess->sess_ops->DataPDUInOrder)
525 return iscsit_set_datain_values_yes_and_no(cmd, datain);
526 else if (!conn->sess->sess_ops->DataSequenceInOrder &&
527 !conn->sess->sess_ops->DataPDUInOrder)
528 return iscsit_set_datain_values_no_and_no(cmd, datain);
529
530 return NULL;
531}
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
20struct 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
35void iscsit_attach_datain_req(struct iscsit_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
42void iscsit_free_datain_req(struct iscsit_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
51void iscsit_free_all_datain_reqs(struct iscsit_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
63struct iscsi_datain_req *iscsit_get_datain_req(struct iscsit_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 */
78static struct iscsi_datain_req *iscsit_set_datain_values_yes_and_yes(
79 struct iscsit_cmd *cmd,
80 struct iscsi_datain *datain)
81{
82 u32 next_burst_len, read_data_done, read_data_left;
83 struct iscsit_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 */
176static struct iscsi_datain_req *iscsit_set_datain_values_no_and_yes(
177 struct iscsit_cmd *cmd,
178 struct iscsi_datain *datain)
179{
180 u32 offset, read_data_done, read_data_left, seq_send_order;
181 struct iscsit_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 */
297static struct iscsi_datain_req *iscsit_set_datain_values_yes_and_no(
298 struct iscsit_cmd *cmd,
299 struct iscsi_datain *datain)
300{
301 u32 next_burst_len, read_data_done, read_data_left;
302 struct iscsit_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 */
396static struct iscsi_datain_req *iscsit_set_datain_values_no_and_no(
397 struct iscsit_cmd *cmd,
398 struct iscsi_datain *datain)
399{
400 u32 read_data_done, read_data_left, seq_send_order;
401 struct iscsit_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
498struct iscsi_datain_req *iscsit_get_datain_values(
499 struct iscsit_cmd *cmd,
500 struct iscsi_datain *datain)
501{
502 struct iscsit_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}
519EXPORT_SYMBOL(iscsit_get_datain_values);