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regmap: add helper macro to set min/max range of register
[deliverable/linux.git] / drivers / target / iscsi / iscsi_target_util.c
1 /*******************************************************************************
2 * This file contains the iSCSI Target specific utility functions.
3 *
4 * (c) Copyright 2007-2013 Datera, Inc.
5 *
6 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 ******************************************************************************/
18
19 #include <linux/list.h>
20 #include <linux/percpu_ida.h>
21 #include <scsi/scsi_tcq.h>
22 #include <scsi/iscsi_proto.h>
23 #include <target/target_core_base.h>
24 #include <target/target_core_fabric.h>
25 #include <target/target_core_configfs.h>
26 #include <target/iscsi/iscsi_transport.h>
27
28 #include "iscsi_target_core.h"
29 #include "iscsi_target_parameters.h"
30 #include "iscsi_target_seq_pdu_list.h"
31 #include "iscsi_target_datain_values.h"
32 #include "iscsi_target_erl0.h"
33 #include "iscsi_target_erl1.h"
34 #include "iscsi_target_erl2.h"
35 #include "iscsi_target_tpg.h"
36 #include "iscsi_target_tq.h"
37 #include "iscsi_target_util.h"
38 #include "iscsi_target.h"
39
40 #define PRINT_BUFF(buff, len) \
41 { \
42 int zzz; \
43 \
44 pr_debug("%d:\n", __LINE__); \
45 for (zzz = 0; zzz < len; zzz++) { \
46 if (zzz % 16 == 0) { \
47 if (zzz) \
48 pr_debug("\n"); \
49 pr_debug("%4i: ", zzz); \
50 } \
51 pr_debug("%02x ", (unsigned char) (buff)[zzz]); \
52 } \
53 if ((len + 1) % 16) \
54 pr_debug("\n"); \
55 }
56
57 extern struct list_head g_tiqn_list;
58 extern spinlock_t tiqn_lock;
59
60 /*
61 * Called with cmd->r2t_lock held.
62 */
63 int iscsit_add_r2t_to_list(
64 struct iscsi_cmd *cmd,
65 u32 offset,
66 u32 xfer_len,
67 int recovery,
68 u32 r2t_sn)
69 {
70 struct iscsi_r2t *r2t;
71
72 r2t = kmem_cache_zalloc(lio_r2t_cache, GFP_ATOMIC);
73 if (!r2t) {
74 pr_err("Unable to allocate memory for struct iscsi_r2t.\n");
75 return -1;
76 }
77 INIT_LIST_HEAD(&r2t->r2t_list);
78
79 r2t->recovery_r2t = recovery;
80 r2t->r2t_sn = (!r2t_sn) ? cmd->r2t_sn++ : r2t_sn;
81 r2t->offset = offset;
82 r2t->xfer_len = xfer_len;
83 list_add_tail(&r2t->r2t_list, &cmd->cmd_r2t_list);
84 spin_unlock_bh(&cmd->r2t_lock);
85
86 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, ISTATE_SEND_R2T);
87
88 spin_lock_bh(&cmd->r2t_lock);
89 return 0;
90 }
91
92 struct iscsi_r2t *iscsit_get_r2t_for_eos(
93 struct iscsi_cmd *cmd,
94 u32 offset,
95 u32 length)
96 {
97 struct iscsi_r2t *r2t;
98
99 spin_lock_bh(&cmd->r2t_lock);
100 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
101 if ((r2t->offset <= offset) &&
102 (r2t->offset + r2t->xfer_len) >= (offset + length)) {
103 spin_unlock_bh(&cmd->r2t_lock);
104 return r2t;
105 }
106 }
107 spin_unlock_bh(&cmd->r2t_lock);
108
109 pr_err("Unable to locate R2T for Offset: %u, Length:"
110 " %u\n", offset, length);
111 return NULL;
112 }
113
114 struct iscsi_r2t *iscsit_get_r2t_from_list(struct iscsi_cmd *cmd)
115 {
116 struct iscsi_r2t *r2t;
117
118 spin_lock_bh(&cmd->r2t_lock);
119 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
120 if (!r2t->sent_r2t) {
121 spin_unlock_bh(&cmd->r2t_lock);
122 return r2t;
123 }
124 }
125 spin_unlock_bh(&cmd->r2t_lock);
126
127 pr_err("Unable to locate next R2T to send for ITT:"
128 " 0x%08x.\n", cmd->init_task_tag);
129 return NULL;
130 }
131
132 /*
133 * Called with cmd->r2t_lock held.
134 */
135 void iscsit_free_r2t(struct iscsi_r2t *r2t, struct iscsi_cmd *cmd)
136 {
137 list_del(&r2t->r2t_list);
138 kmem_cache_free(lio_r2t_cache, r2t);
139 }
140
141 void iscsit_free_r2ts_from_list(struct iscsi_cmd *cmd)
142 {
143 struct iscsi_r2t *r2t, *r2t_tmp;
144
145 spin_lock_bh(&cmd->r2t_lock);
146 list_for_each_entry_safe(r2t, r2t_tmp, &cmd->cmd_r2t_list, r2t_list)
147 iscsit_free_r2t(r2t, cmd);
148 spin_unlock_bh(&cmd->r2t_lock);
149 }
150
151 /*
152 * May be called from software interrupt (timer) context for allocating
153 * iSCSI NopINs.
154 */
155 struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *conn, gfp_t gfp_mask)
156 {
157 struct iscsi_cmd *cmd;
158 struct se_session *se_sess = conn->sess->se_sess;
159 int size, tag;
160
161 tag = percpu_ida_alloc(&se_sess->sess_tag_pool, gfp_mask);
162 size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;
163 cmd = (struct iscsi_cmd *)(se_sess->sess_cmd_map + (tag * size));
164 memset(cmd, 0, size);
165
166 cmd->se_cmd.map_tag = tag;
167 cmd->conn = conn;
168 INIT_LIST_HEAD(&cmd->i_conn_node);
169 INIT_LIST_HEAD(&cmd->datain_list);
170 INIT_LIST_HEAD(&cmd->cmd_r2t_list);
171 spin_lock_init(&cmd->datain_lock);
172 spin_lock_init(&cmd->dataout_timeout_lock);
173 spin_lock_init(&cmd->istate_lock);
174 spin_lock_init(&cmd->error_lock);
175 spin_lock_init(&cmd->r2t_lock);
176
177 return cmd;
178 }
179 EXPORT_SYMBOL(iscsit_allocate_cmd);
180
181 struct iscsi_seq *iscsit_get_seq_holder_for_datain(
182 struct iscsi_cmd *cmd,
183 u32 seq_send_order)
184 {
185 u32 i;
186
187 for (i = 0; i < cmd->seq_count; i++)
188 if (cmd->seq_list[i].seq_send_order == seq_send_order)
189 return &cmd->seq_list[i];
190
191 return NULL;
192 }
193
194 struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsi_cmd *cmd)
195 {
196 u32 i;
197
198 if (!cmd->seq_list) {
199 pr_err("struct iscsi_cmd->seq_list is NULL!\n");
200 return NULL;
201 }
202
203 for (i = 0; i < cmd->seq_count; i++) {
204 if (cmd->seq_list[i].type != SEQTYPE_NORMAL)
205 continue;
206 if (cmd->seq_list[i].seq_send_order == cmd->seq_send_order) {
207 cmd->seq_send_order++;
208 return &cmd->seq_list[i];
209 }
210 }
211
212 return NULL;
213 }
214
215 struct iscsi_r2t *iscsit_get_holder_for_r2tsn(
216 struct iscsi_cmd *cmd,
217 u32 r2t_sn)
218 {
219 struct iscsi_r2t *r2t;
220
221 spin_lock_bh(&cmd->r2t_lock);
222 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
223 if (r2t->r2t_sn == r2t_sn) {
224 spin_unlock_bh(&cmd->r2t_lock);
225 return r2t;
226 }
227 }
228 spin_unlock_bh(&cmd->r2t_lock);
229
230 return NULL;
231 }
232
233 static inline int iscsit_check_received_cmdsn(struct iscsi_session *sess, u32 cmdsn)
234 {
235 int ret;
236
237 /*
238 * This is the proper method of checking received CmdSN against
239 * ExpCmdSN and MaxCmdSN values, as well as accounting for out
240 * or order CmdSNs due to multiple connection sessions and/or
241 * CRC failures.
242 */
243 if (iscsi_sna_gt(cmdsn, sess->max_cmd_sn)) {
244 pr_err("Received CmdSN: 0x%08x is greater than"
245 " MaxCmdSN: 0x%08x, protocol error.\n", cmdsn,
246 sess->max_cmd_sn);
247 ret = CMDSN_ERROR_CANNOT_RECOVER;
248
249 } else if (cmdsn == sess->exp_cmd_sn) {
250 sess->exp_cmd_sn++;
251 pr_debug("Received CmdSN matches ExpCmdSN,"
252 " incremented ExpCmdSN to: 0x%08x\n",
253 sess->exp_cmd_sn);
254 ret = CMDSN_NORMAL_OPERATION;
255
256 } else if (iscsi_sna_gt(cmdsn, sess->exp_cmd_sn)) {
257 pr_debug("Received CmdSN: 0x%08x is greater"
258 " than ExpCmdSN: 0x%08x, not acknowledging.\n",
259 cmdsn, sess->exp_cmd_sn);
260 ret = CMDSN_HIGHER_THAN_EXP;
261
262 } else {
263 pr_err("Received CmdSN: 0x%08x is less than"
264 " ExpCmdSN: 0x%08x, ignoring.\n", cmdsn,
265 sess->exp_cmd_sn);
266 ret = CMDSN_LOWER_THAN_EXP;
267 }
268
269 return ret;
270 }
271
272 /*
273 * Commands may be received out of order if MC/S is in use.
274 * Ensure they are executed in CmdSN order.
275 */
276 int iscsit_sequence_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
277 unsigned char *buf, __be32 cmdsn)
278 {
279 int ret, cmdsn_ret;
280 bool reject = false;
281 u8 reason = ISCSI_REASON_BOOKMARK_NO_RESOURCES;
282
283 mutex_lock(&conn->sess->cmdsn_mutex);
284
285 cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, be32_to_cpu(cmdsn));
286 switch (cmdsn_ret) {
287 case CMDSN_NORMAL_OPERATION:
288 ret = iscsit_execute_cmd(cmd, 0);
289 if ((ret >= 0) && !list_empty(&conn->sess->sess_ooo_cmdsn_list))
290 iscsit_execute_ooo_cmdsns(conn->sess);
291 else if (ret < 0) {
292 reject = true;
293 ret = CMDSN_ERROR_CANNOT_RECOVER;
294 }
295 break;
296 case CMDSN_HIGHER_THAN_EXP:
297 ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, be32_to_cpu(cmdsn));
298 if (ret < 0) {
299 reject = true;
300 ret = CMDSN_ERROR_CANNOT_RECOVER;
301 break;
302 }
303 ret = CMDSN_HIGHER_THAN_EXP;
304 break;
305 case CMDSN_LOWER_THAN_EXP:
306 cmd->i_state = ISTATE_REMOVE;
307 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
308 ret = cmdsn_ret;
309 break;
310 default:
311 reason = ISCSI_REASON_PROTOCOL_ERROR;
312 reject = true;
313 ret = cmdsn_ret;
314 break;
315 }
316 mutex_unlock(&conn->sess->cmdsn_mutex);
317
318 if (reject)
319 iscsit_reject_cmd(cmd, reason, buf);
320
321 return ret;
322 }
323 EXPORT_SYMBOL(iscsit_sequence_cmd);
324
325 int iscsit_check_unsolicited_dataout(struct iscsi_cmd *cmd, unsigned char *buf)
326 {
327 struct iscsi_conn *conn = cmd->conn;
328 struct se_cmd *se_cmd = &cmd->se_cmd;
329 struct iscsi_data *hdr = (struct iscsi_data *) buf;
330 u32 payload_length = ntoh24(hdr->dlength);
331
332 if (conn->sess->sess_ops->InitialR2T) {
333 pr_err("Received unexpected unsolicited data"
334 " while InitialR2T=Yes, protocol error.\n");
335 transport_send_check_condition_and_sense(se_cmd,
336 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
337 return -1;
338 }
339
340 if ((cmd->first_burst_len + payload_length) >
341 conn->sess->sess_ops->FirstBurstLength) {
342 pr_err("Total %u bytes exceeds FirstBurstLength: %u"
343 " for this Unsolicited DataOut Burst.\n",
344 (cmd->first_burst_len + payload_length),
345 conn->sess->sess_ops->FirstBurstLength);
346 transport_send_check_condition_and_sense(se_cmd,
347 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
348 return -1;
349 }
350
351 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))
352 return 0;
353
354 if (((cmd->first_burst_len + payload_length) != cmd->se_cmd.data_length) &&
355 ((cmd->first_burst_len + payload_length) !=
356 conn->sess->sess_ops->FirstBurstLength)) {
357 pr_err("Unsolicited non-immediate data received %u"
358 " does not equal FirstBurstLength: %u, and does"
359 " not equal ExpXferLen %u.\n",
360 (cmd->first_burst_len + payload_length),
361 conn->sess->sess_ops->FirstBurstLength, cmd->se_cmd.data_length);
362 transport_send_check_condition_and_sense(se_cmd,
363 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
364 return -1;
365 }
366 return 0;
367 }
368
369 struct iscsi_cmd *iscsit_find_cmd_from_itt(
370 struct iscsi_conn *conn,
371 itt_t init_task_tag)
372 {
373 struct iscsi_cmd *cmd;
374
375 spin_lock_bh(&conn->cmd_lock);
376 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
377 if (cmd->init_task_tag == init_task_tag) {
378 spin_unlock_bh(&conn->cmd_lock);
379 return cmd;
380 }
381 }
382 spin_unlock_bh(&conn->cmd_lock);
383
384 pr_err("Unable to locate ITT: 0x%08x on CID: %hu",
385 init_task_tag, conn->cid);
386 return NULL;
387 }
388
389 struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump(
390 struct iscsi_conn *conn,
391 itt_t init_task_tag,
392 u32 length)
393 {
394 struct iscsi_cmd *cmd;
395
396 spin_lock_bh(&conn->cmd_lock);
397 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
398 if (cmd->init_task_tag == init_task_tag) {
399 spin_unlock_bh(&conn->cmd_lock);
400 return cmd;
401 }
402 }
403 spin_unlock_bh(&conn->cmd_lock);
404
405 pr_err("Unable to locate ITT: 0x%08x on CID: %hu,"
406 " dumping payload\n", init_task_tag, conn->cid);
407 if (length)
408 iscsit_dump_data_payload(conn, length, 1);
409
410 return NULL;
411 }
412
413 struct iscsi_cmd *iscsit_find_cmd_from_ttt(
414 struct iscsi_conn *conn,
415 u32 targ_xfer_tag)
416 {
417 struct iscsi_cmd *cmd = NULL;
418
419 spin_lock_bh(&conn->cmd_lock);
420 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
421 if (cmd->targ_xfer_tag == targ_xfer_tag) {
422 spin_unlock_bh(&conn->cmd_lock);
423 return cmd;
424 }
425 }
426 spin_unlock_bh(&conn->cmd_lock);
427
428 pr_err("Unable to locate TTT: 0x%08x on CID: %hu\n",
429 targ_xfer_tag, conn->cid);
430 return NULL;
431 }
432
433 int iscsit_find_cmd_for_recovery(
434 struct iscsi_session *sess,
435 struct iscsi_cmd **cmd_ptr,
436 struct iscsi_conn_recovery **cr_ptr,
437 itt_t init_task_tag)
438 {
439 struct iscsi_cmd *cmd = NULL;
440 struct iscsi_conn_recovery *cr;
441 /*
442 * Scan through the inactive connection recovery list's command list.
443 * If init_task_tag matches the command is still alligent.
444 */
445 spin_lock(&sess->cr_i_lock);
446 list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) {
447 spin_lock(&cr->conn_recovery_cmd_lock);
448 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
449 if (cmd->init_task_tag == init_task_tag) {
450 spin_unlock(&cr->conn_recovery_cmd_lock);
451 spin_unlock(&sess->cr_i_lock);
452
453 *cr_ptr = cr;
454 *cmd_ptr = cmd;
455 return -2;
456 }
457 }
458 spin_unlock(&cr->conn_recovery_cmd_lock);
459 }
460 spin_unlock(&sess->cr_i_lock);
461 /*
462 * Scan through the active connection recovery list's command list.
463 * If init_task_tag matches the command is ready to be reassigned.
464 */
465 spin_lock(&sess->cr_a_lock);
466 list_for_each_entry(cr, &sess->cr_active_list, cr_list) {
467 spin_lock(&cr->conn_recovery_cmd_lock);
468 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
469 if (cmd->init_task_tag == init_task_tag) {
470 spin_unlock(&cr->conn_recovery_cmd_lock);
471 spin_unlock(&sess->cr_a_lock);
472
473 *cr_ptr = cr;
474 *cmd_ptr = cmd;
475 return 0;
476 }
477 }
478 spin_unlock(&cr->conn_recovery_cmd_lock);
479 }
480 spin_unlock(&sess->cr_a_lock);
481
482 return -1;
483 }
484
485 void iscsit_add_cmd_to_immediate_queue(
486 struct iscsi_cmd *cmd,
487 struct iscsi_conn *conn,
488 u8 state)
489 {
490 struct iscsi_queue_req *qr;
491
492 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
493 if (!qr) {
494 pr_err("Unable to allocate memory for"
495 " struct iscsi_queue_req\n");
496 return;
497 }
498 INIT_LIST_HEAD(&qr->qr_list);
499 qr->cmd = cmd;
500 qr->state = state;
501
502 spin_lock_bh(&conn->immed_queue_lock);
503 list_add_tail(&qr->qr_list, &conn->immed_queue_list);
504 atomic_inc(&cmd->immed_queue_count);
505 atomic_set(&conn->check_immediate_queue, 1);
506 spin_unlock_bh(&conn->immed_queue_lock);
507
508 wake_up(&conn->queues_wq);
509 }
510
511 struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *conn)
512 {
513 struct iscsi_queue_req *qr;
514
515 spin_lock_bh(&conn->immed_queue_lock);
516 if (list_empty(&conn->immed_queue_list)) {
517 spin_unlock_bh(&conn->immed_queue_lock);
518 return NULL;
519 }
520 qr = list_first_entry(&conn->immed_queue_list,
521 struct iscsi_queue_req, qr_list);
522
523 list_del(&qr->qr_list);
524 if (qr->cmd)
525 atomic_dec(&qr->cmd->immed_queue_count);
526 spin_unlock_bh(&conn->immed_queue_lock);
527
528 return qr;
529 }
530
531 static void iscsit_remove_cmd_from_immediate_queue(
532 struct iscsi_cmd *cmd,
533 struct iscsi_conn *conn)
534 {
535 struct iscsi_queue_req *qr, *qr_tmp;
536
537 spin_lock_bh(&conn->immed_queue_lock);
538 if (!atomic_read(&cmd->immed_queue_count)) {
539 spin_unlock_bh(&conn->immed_queue_lock);
540 return;
541 }
542
543 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
544 if (qr->cmd != cmd)
545 continue;
546
547 atomic_dec(&qr->cmd->immed_queue_count);
548 list_del(&qr->qr_list);
549 kmem_cache_free(lio_qr_cache, qr);
550 }
551 spin_unlock_bh(&conn->immed_queue_lock);
552
553 if (atomic_read(&cmd->immed_queue_count)) {
554 pr_err("ITT: 0x%08x immed_queue_count: %d\n",
555 cmd->init_task_tag,
556 atomic_read(&cmd->immed_queue_count));
557 }
558 }
559
560 void iscsit_add_cmd_to_response_queue(
561 struct iscsi_cmd *cmd,
562 struct iscsi_conn *conn,
563 u8 state)
564 {
565 struct iscsi_queue_req *qr;
566
567 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
568 if (!qr) {
569 pr_err("Unable to allocate memory for"
570 " struct iscsi_queue_req\n");
571 return;
572 }
573 INIT_LIST_HEAD(&qr->qr_list);
574 qr->cmd = cmd;
575 qr->state = state;
576
577 spin_lock_bh(&conn->response_queue_lock);
578 list_add_tail(&qr->qr_list, &conn->response_queue_list);
579 atomic_inc(&cmd->response_queue_count);
580 spin_unlock_bh(&conn->response_queue_lock);
581
582 wake_up(&conn->queues_wq);
583 }
584
585 struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *conn)
586 {
587 struct iscsi_queue_req *qr;
588
589 spin_lock_bh(&conn->response_queue_lock);
590 if (list_empty(&conn->response_queue_list)) {
591 spin_unlock_bh(&conn->response_queue_lock);
592 return NULL;
593 }
594
595 qr = list_first_entry(&conn->response_queue_list,
596 struct iscsi_queue_req, qr_list);
597
598 list_del(&qr->qr_list);
599 if (qr->cmd)
600 atomic_dec(&qr->cmd->response_queue_count);
601 spin_unlock_bh(&conn->response_queue_lock);
602
603 return qr;
604 }
605
606 static void iscsit_remove_cmd_from_response_queue(
607 struct iscsi_cmd *cmd,
608 struct iscsi_conn *conn)
609 {
610 struct iscsi_queue_req *qr, *qr_tmp;
611
612 spin_lock_bh(&conn->response_queue_lock);
613 if (!atomic_read(&cmd->response_queue_count)) {
614 spin_unlock_bh(&conn->response_queue_lock);
615 return;
616 }
617
618 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
619 qr_list) {
620 if (qr->cmd != cmd)
621 continue;
622
623 atomic_dec(&qr->cmd->response_queue_count);
624 list_del(&qr->qr_list);
625 kmem_cache_free(lio_qr_cache, qr);
626 }
627 spin_unlock_bh(&conn->response_queue_lock);
628
629 if (atomic_read(&cmd->response_queue_count)) {
630 pr_err("ITT: 0x%08x response_queue_count: %d\n",
631 cmd->init_task_tag,
632 atomic_read(&cmd->response_queue_count));
633 }
634 }
635
636 bool iscsit_conn_all_queues_empty(struct iscsi_conn *conn)
637 {
638 bool empty;
639
640 spin_lock_bh(&conn->immed_queue_lock);
641 empty = list_empty(&conn->immed_queue_list);
642 spin_unlock_bh(&conn->immed_queue_lock);
643
644 if (!empty)
645 return empty;
646
647 spin_lock_bh(&conn->response_queue_lock);
648 empty = list_empty(&conn->response_queue_list);
649 spin_unlock_bh(&conn->response_queue_lock);
650
651 return empty;
652 }
653
654 void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn)
655 {
656 struct iscsi_queue_req *qr, *qr_tmp;
657
658 spin_lock_bh(&conn->immed_queue_lock);
659 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
660 list_del(&qr->qr_list);
661 if (qr->cmd)
662 atomic_dec(&qr->cmd->immed_queue_count);
663
664 kmem_cache_free(lio_qr_cache, qr);
665 }
666 spin_unlock_bh(&conn->immed_queue_lock);
667
668 spin_lock_bh(&conn->response_queue_lock);
669 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
670 qr_list) {
671 list_del(&qr->qr_list);
672 if (qr->cmd)
673 atomic_dec(&qr->cmd->response_queue_count);
674
675 kmem_cache_free(lio_qr_cache, qr);
676 }
677 spin_unlock_bh(&conn->response_queue_lock);
678 }
679
680 void iscsit_release_cmd(struct iscsi_cmd *cmd)
681 {
682 struct iscsi_session *sess;
683 struct se_cmd *se_cmd = &cmd->se_cmd;
684
685 if (cmd->conn)
686 sess = cmd->conn->sess;
687 else
688 sess = cmd->sess;
689
690 BUG_ON(!sess || !sess->se_sess);
691
692 kfree(cmd->buf_ptr);
693 kfree(cmd->pdu_list);
694 kfree(cmd->seq_list);
695 kfree(cmd->tmr_req);
696 kfree(cmd->iov_data);
697 kfree(cmd->text_in_ptr);
698
699 percpu_ida_free(&sess->se_sess->sess_tag_pool, se_cmd->map_tag);
700 }
701 EXPORT_SYMBOL(iscsit_release_cmd);
702
703 static void __iscsit_free_cmd(struct iscsi_cmd *cmd, bool scsi_cmd,
704 bool check_queues)
705 {
706 struct iscsi_conn *conn = cmd->conn;
707
708 if (scsi_cmd) {
709 if (cmd->data_direction == DMA_TO_DEVICE) {
710 iscsit_stop_dataout_timer(cmd);
711 iscsit_free_r2ts_from_list(cmd);
712 }
713 if (cmd->data_direction == DMA_FROM_DEVICE)
714 iscsit_free_all_datain_reqs(cmd);
715 }
716
717 if (conn && check_queues) {
718 iscsit_remove_cmd_from_immediate_queue(cmd, conn);
719 iscsit_remove_cmd_from_response_queue(cmd, conn);
720 }
721 }
722
723 void iscsit_free_cmd(struct iscsi_cmd *cmd, bool shutdown)
724 {
725 struct se_cmd *se_cmd = NULL;
726 int rc;
727 /*
728 * Determine if a struct se_cmd is associated with
729 * this struct iscsi_cmd.
730 */
731 switch (cmd->iscsi_opcode) {
732 case ISCSI_OP_SCSI_CMD:
733 se_cmd = &cmd->se_cmd;
734 __iscsit_free_cmd(cmd, true, shutdown);
735 /*
736 * Fallthrough
737 */
738 case ISCSI_OP_SCSI_TMFUNC:
739 rc = transport_generic_free_cmd(&cmd->se_cmd, 1);
740 if (!rc && shutdown && se_cmd && se_cmd->se_sess) {
741 __iscsit_free_cmd(cmd, true, shutdown);
742 target_put_sess_cmd(se_cmd->se_sess, se_cmd);
743 }
744 break;
745 case ISCSI_OP_REJECT:
746 /*
747 * Handle special case for REJECT when iscsi_add_reject*() has
748 * overwritten the original iscsi_opcode assignment, and the
749 * associated cmd->se_cmd needs to be released.
750 */
751 if (cmd->se_cmd.se_tfo != NULL) {
752 se_cmd = &cmd->se_cmd;
753 __iscsit_free_cmd(cmd, true, shutdown);
754
755 rc = transport_generic_free_cmd(&cmd->se_cmd, 1);
756 if (!rc && shutdown && se_cmd->se_sess) {
757 __iscsit_free_cmd(cmd, true, shutdown);
758 target_put_sess_cmd(se_cmd->se_sess, se_cmd);
759 }
760 break;
761 }
762 /* Fall-through */
763 default:
764 __iscsit_free_cmd(cmd, false, shutdown);
765 iscsit_release_cmd(cmd);
766 break;
767 }
768 }
769
770 int iscsit_check_session_usage_count(struct iscsi_session *sess)
771 {
772 spin_lock_bh(&sess->session_usage_lock);
773 if (sess->session_usage_count != 0) {
774 sess->session_waiting_on_uc = 1;
775 spin_unlock_bh(&sess->session_usage_lock);
776 if (in_interrupt())
777 return 2;
778
779 wait_for_completion(&sess->session_waiting_on_uc_comp);
780 return 1;
781 }
782 spin_unlock_bh(&sess->session_usage_lock);
783
784 return 0;
785 }
786
787 void iscsit_dec_session_usage_count(struct iscsi_session *sess)
788 {
789 spin_lock_bh(&sess->session_usage_lock);
790 sess->session_usage_count--;
791
792 if (!sess->session_usage_count && sess->session_waiting_on_uc)
793 complete(&sess->session_waiting_on_uc_comp);
794
795 spin_unlock_bh(&sess->session_usage_lock);
796 }
797
798 void iscsit_inc_session_usage_count(struct iscsi_session *sess)
799 {
800 spin_lock_bh(&sess->session_usage_lock);
801 sess->session_usage_count++;
802 spin_unlock_bh(&sess->session_usage_lock);
803 }
804
805 /*
806 * Setup conn->if_marker and conn->of_marker values based upon
807 * the initial marker-less interval. (see iSCSI v19 A.2)
808 */
809 int iscsit_set_sync_and_steering_values(struct iscsi_conn *conn)
810 {
811 int login_ifmarker_count = 0, login_ofmarker_count = 0, next_marker = 0;
812 /*
813 * IFMarkInt and OFMarkInt are negotiated as 32-bit words.
814 */
815 u32 IFMarkInt = (conn->conn_ops->IFMarkInt * 4);
816 u32 OFMarkInt = (conn->conn_ops->OFMarkInt * 4);
817
818 if (conn->conn_ops->OFMarker) {
819 /*
820 * Account for the first Login Command received not
821 * via iscsi_recv_msg().
822 */
823 conn->of_marker += ISCSI_HDR_LEN;
824 if (conn->of_marker <= OFMarkInt) {
825 conn->of_marker = (OFMarkInt - conn->of_marker);
826 } else {
827 login_ofmarker_count = (conn->of_marker / OFMarkInt);
828 next_marker = (OFMarkInt * (login_ofmarker_count + 1)) +
829 (login_ofmarker_count * MARKER_SIZE);
830 conn->of_marker = (next_marker - conn->of_marker);
831 }
832 conn->of_marker_offset = 0;
833 pr_debug("Setting OFMarker value to %u based on Initial"
834 " Markerless Interval.\n", conn->of_marker);
835 }
836
837 if (conn->conn_ops->IFMarker) {
838 if (conn->if_marker <= IFMarkInt) {
839 conn->if_marker = (IFMarkInt - conn->if_marker);
840 } else {
841 login_ifmarker_count = (conn->if_marker / IFMarkInt);
842 next_marker = (IFMarkInt * (login_ifmarker_count + 1)) +
843 (login_ifmarker_count * MARKER_SIZE);
844 conn->if_marker = (next_marker - conn->if_marker);
845 }
846 pr_debug("Setting IFMarker value to %u based on Initial"
847 " Markerless Interval.\n", conn->if_marker);
848 }
849
850 return 0;
851 }
852
853 struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid)
854 {
855 struct iscsi_conn *conn;
856
857 spin_lock_bh(&sess->conn_lock);
858 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
859 if ((conn->cid == cid) &&
860 (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) {
861 iscsit_inc_conn_usage_count(conn);
862 spin_unlock_bh(&sess->conn_lock);
863 return conn;
864 }
865 }
866 spin_unlock_bh(&sess->conn_lock);
867
868 return NULL;
869 }
870
871 struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid)
872 {
873 struct iscsi_conn *conn;
874
875 spin_lock_bh(&sess->conn_lock);
876 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
877 if (conn->cid == cid) {
878 iscsit_inc_conn_usage_count(conn);
879 spin_lock(&conn->state_lock);
880 atomic_set(&conn->connection_wait_rcfr, 1);
881 spin_unlock(&conn->state_lock);
882 spin_unlock_bh(&sess->conn_lock);
883 return conn;
884 }
885 }
886 spin_unlock_bh(&sess->conn_lock);
887
888 return NULL;
889 }
890
891 void iscsit_check_conn_usage_count(struct iscsi_conn *conn)
892 {
893 spin_lock_bh(&conn->conn_usage_lock);
894 if (conn->conn_usage_count != 0) {
895 conn->conn_waiting_on_uc = 1;
896 spin_unlock_bh(&conn->conn_usage_lock);
897
898 wait_for_completion(&conn->conn_waiting_on_uc_comp);
899 return;
900 }
901 spin_unlock_bh(&conn->conn_usage_lock);
902 }
903
904 void iscsit_dec_conn_usage_count(struct iscsi_conn *conn)
905 {
906 spin_lock_bh(&conn->conn_usage_lock);
907 conn->conn_usage_count--;
908
909 if (!conn->conn_usage_count && conn->conn_waiting_on_uc)
910 complete(&conn->conn_waiting_on_uc_comp);
911
912 spin_unlock_bh(&conn->conn_usage_lock);
913 }
914
915 void iscsit_inc_conn_usage_count(struct iscsi_conn *conn)
916 {
917 spin_lock_bh(&conn->conn_usage_lock);
918 conn->conn_usage_count++;
919 spin_unlock_bh(&conn->conn_usage_lock);
920 }
921
922 static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response)
923 {
924 u8 state;
925 struct iscsi_cmd *cmd;
926
927 cmd = iscsit_allocate_cmd(conn, GFP_ATOMIC);
928 if (!cmd)
929 return -1;
930
931 cmd->iscsi_opcode = ISCSI_OP_NOOP_IN;
932 state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE :
933 ISTATE_SEND_NOPIN_NO_RESPONSE;
934 cmd->init_task_tag = RESERVED_ITT;
935 spin_lock_bh(&conn->sess->ttt_lock);
936 cmd->targ_xfer_tag = (want_response) ? conn->sess->targ_xfer_tag++ :
937 0xFFFFFFFF;
938 if (want_response && (cmd->targ_xfer_tag == 0xFFFFFFFF))
939 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
940 spin_unlock_bh(&conn->sess->ttt_lock);
941
942 spin_lock_bh(&conn->cmd_lock);
943 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
944 spin_unlock_bh(&conn->cmd_lock);
945
946 if (want_response)
947 iscsit_start_nopin_response_timer(conn);
948 iscsit_add_cmd_to_immediate_queue(cmd, conn, state);
949
950 return 0;
951 }
952
953 static void iscsit_handle_nopin_response_timeout(unsigned long data)
954 {
955 struct iscsi_conn *conn = (struct iscsi_conn *) data;
956
957 iscsit_inc_conn_usage_count(conn);
958
959 spin_lock_bh(&conn->nopin_timer_lock);
960 if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) {
961 spin_unlock_bh(&conn->nopin_timer_lock);
962 iscsit_dec_conn_usage_count(conn);
963 return;
964 }
965
966 pr_debug("Did not receive response to NOPIN on CID: %hu on"
967 " SID: %u, failing connection.\n", conn->cid,
968 conn->sess->sid);
969 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
970 spin_unlock_bh(&conn->nopin_timer_lock);
971
972 {
973 struct iscsi_portal_group *tpg = conn->sess->tpg;
974 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
975
976 if (tiqn) {
977 spin_lock_bh(&tiqn->sess_err_stats.lock);
978 strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
979 conn->sess->sess_ops->InitiatorName);
980 tiqn->sess_err_stats.last_sess_failure_type =
981 ISCSI_SESS_ERR_CXN_TIMEOUT;
982 tiqn->sess_err_stats.cxn_timeout_errors++;
983 conn->sess->conn_timeout_errors++;
984 spin_unlock_bh(&tiqn->sess_err_stats.lock);
985 }
986 }
987
988 iscsit_cause_connection_reinstatement(conn, 0);
989 iscsit_dec_conn_usage_count(conn);
990 }
991
992 void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn)
993 {
994 struct iscsi_session *sess = conn->sess;
995 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
996
997 spin_lock_bh(&conn->nopin_timer_lock);
998 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
999 spin_unlock_bh(&conn->nopin_timer_lock);
1000 return;
1001 }
1002
1003 mod_timer(&conn->nopin_response_timer,
1004 (get_jiffies_64() + na->nopin_response_timeout * HZ));
1005 spin_unlock_bh(&conn->nopin_timer_lock);
1006 }
1007
1008 /*
1009 * Called with conn->nopin_timer_lock held.
1010 */
1011 void iscsit_start_nopin_response_timer(struct iscsi_conn *conn)
1012 {
1013 struct iscsi_session *sess = conn->sess;
1014 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1015
1016 spin_lock_bh(&conn->nopin_timer_lock);
1017 if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) {
1018 spin_unlock_bh(&conn->nopin_timer_lock);
1019 return;
1020 }
1021
1022 init_timer(&conn->nopin_response_timer);
1023 conn->nopin_response_timer.expires =
1024 (get_jiffies_64() + na->nopin_response_timeout * HZ);
1025 conn->nopin_response_timer.data = (unsigned long)conn;
1026 conn->nopin_response_timer.function = iscsit_handle_nopin_response_timeout;
1027 conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP;
1028 conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING;
1029 add_timer(&conn->nopin_response_timer);
1030
1031 pr_debug("Started NOPIN Response Timer on CID: %d to %u"
1032 " seconds\n", conn->cid, na->nopin_response_timeout);
1033 spin_unlock_bh(&conn->nopin_timer_lock);
1034 }
1035
1036 void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn)
1037 {
1038 spin_lock_bh(&conn->nopin_timer_lock);
1039 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
1040 spin_unlock_bh(&conn->nopin_timer_lock);
1041 return;
1042 }
1043 conn->nopin_response_timer_flags |= ISCSI_TF_STOP;
1044 spin_unlock_bh(&conn->nopin_timer_lock);
1045
1046 del_timer_sync(&conn->nopin_response_timer);
1047
1048 spin_lock_bh(&conn->nopin_timer_lock);
1049 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
1050 spin_unlock_bh(&conn->nopin_timer_lock);
1051 }
1052
1053 static void iscsit_handle_nopin_timeout(unsigned long data)
1054 {
1055 struct iscsi_conn *conn = (struct iscsi_conn *) data;
1056
1057 iscsit_inc_conn_usage_count(conn);
1058
1059 spin_lock_bh(&conn->nopin_timer_lock);
1060 if (conn->nopin_timer_flags & ISCSI_TF_STOP) {
1061 spin_unlock_bh(&conn->nopin_timer_lock);
1062 iscsit_dec_conn_usage_count(conn);
1063 return;
1064 }
1065 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1066 spin_unlock_bh(&conn->nopin_timer_lock);
1067
1068 iscsit_add_nopin(conn, 1);
1069 iscsit_dec_conn_usage_count(conn);
1070 }
1071
1072 /*
1073 * Called with conn->nopin_timer_lock held.
1074 */
1075 void __iscsit_start_nopin_timer(struct iscsi_conn *conn)
1076 {
1077 struct iscsi_session *sess = conn->sess;
1078 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1079 /*
1080 * NOPIN timeout is disabled.
1081 */
1082 if (!na->nopin_timeout)
1083 return;
1084
1085 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING)
1086 return;
1087
1088 init_timer(&conn->nopin_timer);
1089 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1090 conn->nopin_timer.data = (unsigned long)conn;
1091 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1092 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1093 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1094 add_timer(&conn->nopin_timer);
1095
1096 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1097 " interval\n", conn->cid, na->nopin_timeout);
1098 }
1099
1100 void iscsit_start_nopin_timer(struct iscsi_conn *conn)
1101 {
1102 struct iscsi_session *sess = conn->sess;
1103 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1104 /*
1105 * NOPIN timeout is disabled..
1106 */
1107 if (!na->nopin_timeout)
1108 return;
1109
1110 spin_lock_bh(&conn->nopin_timer_lock);
1111 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) {
1112 spin_unlock_bh(&conn->nopin_timer_lock);
1113 return;
1114 }
1115
1116 init_timer(&conn->nopin_timer);
1117 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1118 conn->nopin_timer.data = (unsigned long)conn;
1119 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1120 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1121 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1122 add_timer(&conn->nopin_timer);
1123
1124 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1125 " interval\n", conn->cid, na->nopin_timeout);
1126 spin_unlock_bh(&conn->nopin_timer_lock);
1127 }
1128
1129 void iscsit_stop_nopin_timer(struct iscsi_conn *conn)
1130 {
1131 spin_lock_bh(&conn->nopin_timer_lock);
1132 if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) {
1133 spin_unlock_bh(&conn->nopin_timer_lock);
1134 return;
1135 }
1136 conn->nopin_timer_flags |= ISCSI_TF_STOP;
1137 spin_unlock_bh(&conn->nopin_timer_lock);
1138
1139 del_timer_sync(&conn->nopin_timer);
1140
1141 spin_lock_bh(&conn->nopin_timer_lock);
1142 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1143 spin_unlock_bh(&conn->nopin_timer_lock);
1144 }
1145
1146 int iscsit_send_tx_data(
1147 struct iscsi_cmd *cmd,
1148 struct iscsi_conn *conn,
1149 int use_misc)
1150 {
1151 int tx_sent, tx_size;
1152 u32 iov_count;
1153 struct kvec *iov;
1154
1155 send_data:
1156 tx_size = cmd->tx_size;
1157
1158 if (!use_misc) {
1159 iov = &cmd->iov_data[0];
1160 iov_count = cmd->iov_data_count;
1161 } else {
1162 iov = &cmd->iov_misc[0];
1163 iov_count = cmd->iov_misc_count;
1164 }
1165
1166 tx_sent = tx_data(conn, &iov[0], iov_count, tx_size);
1167 if (tx_size != tx_sent) {
1168 if (tx_sent == -EAGAIN) {
1169 pr_err("tx_data() returned -EAGAIN\n");
1170 goto send_data;
1171 } else
1172 return -1;
1173 }
1174 cmd->tx_size = 0;
1175
1176 return 0;
1177 }
1178
1179 int iscsit_fe_sendpage_sg(
1180 struct iscsi_cmd *cmd,
1181 struct iscsi_conn *conn)
1182 {
1183 struct scatterlist *sg = cmd->first_data_sg;
1184 struct kvec iov;
1185 u32 tx_hdr_size, data_len;
1186 u32 offset = cmd->first_data_sg_off;
1187 int tx_sent, iov_off;
1188
1189 send_hdr:
1190 tx_hdr_size = ISCSI_HDR_LEN;
1191 if (conn->conn_ops->HeaderDigest)
1192 tx_hdr_size += ISCSI_CRC_LEN;
1193
1194 iov.iov_base = cmd->pdu;
1195 iov.iov_len = tx_hdr_size;
1196
1197 tx_sent = tx_data(conn, &iov, 1, tx_hdr_size);
1198 if (tx_hdr_size != tx_sent) {
1199 if (tx_sent == -EAGAIN) {
1200 pr_err("tx_data() returned -EAGAIN\n");
1201 goto send_hdr;
1202 }
1203 return -1;
1204 }
1205
1206 data_len = cmd->tx_size - tx_hdr_size - cmd->padding;
1207 /*
1208 * Set iov_off used by padding and data digest tx_data() calls below
1209 * in order to determine proper offset into cmd->iov_data[]
1210 */
1211 if (conn->conn_ops->DataDigest) {
1212 data_len -= ISCSI_CRC_LEN;
1213 if (cmd->padding)
1214 iov_off = (cmd->iov_data_count - 2);
1215 else
1216 iov_off = (cmd->iov_data_count - 1);
1217 } else {
1218 iov_off = (cmd->iov_data_count - 1);
1219 }
1220 /*
1221 * Perform sendpage() for each page in the scatterlist
1222 */
1223 while (data_len) {
1224 u32 space = (sg->length - offset);
1225 u32 sub_len = min_t(u32, data_len, space);
1226 send_pg:
1227 tx_sent = conn->sock->ops->sendpage(conn->sock,
1228 sg_page(sg), sg->offset + offset, sub_len, 0);
1229 if (tx_sent != sub_len) {
1230 if (tx_sent == -EAGAIN) {
1231 pr_err("tcp_sendpage() returned"
1232 " -EAGAIN\n");
1233 goto send_pg;
1234 }
1235
1236 pr_err("tcp_sendpage() failure: %d\n",
1237 tx_sent);
1238 return -1;
1239 }
1240
1241 data_len -= sub_len;
1242 offset = 0;
1243 sg = sg_next(sg);
1244 }
1245
1246 send_padding:
1247 if (cmd->padding) {
1248 struct kvec *iov_p = &cmd->iov_data[iov_off++];
1249
1250 tx_sent = tx_data(conn, iov_p, 1, cmd->padding);
1251 if (cmd->padding != tx_sent) {
1252 if (tx_sent == -EAGAIN) {
1253 pr_err("tx_data() returned -EAGAIN\n");
1254 goto send_padding;
1255 }
1256 return -1;
1257 }
1258 }
1259
1260 send_datacrc:
1261 if (conn->conn_ops->DataDigest) {
1262 struct kvec *iov_d = &cmd->iov_data[iov_off];
1263
1264 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN);
1265 if (ISCSI_CRC_LEN != tx_sent) {
1266 if (tx_sent == -EAGAIN) {
1267 pr_err("tx_data() returned -EAGAIN\n");
1268 goto send_datacrc;
1269 }
1270 return -1;
1271 }
1272 }
1273
1274 return 0;
1275 }
1276
1277 /*
1278 * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU
1279 * back to the Initiator when an expection condition occurs with the
1280 * errors set in status_class and status_detail.
1281 *
1282 * Parameters: iSCSI Connection, Status Class, Status Detail.
1283 * Returns: 0 on success, -1 on error.
1284 */
1285 int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail)
1286 {
1287 struct iscsi_login_rsp *hdr;
1288 struct iscsi_login *login = conn->conn_login;
1289
1290 login->login_failed = 1;
1291 iscsit_collect_login_stats(conn, status_class, status_detail);
1292
1293 hdr = (struct iscsi_login_rsp *)&login->rsp[0];
1294 hdr->opcode = ISCSI_OP_LOGIN_RSP;
1295 hdr->status_class = status_class;
1296 hdr->status_detail = status_detail;
1297 hdr->itt = conn->login_itt;
1298
1299 return conn->conn_transport->iscsit_put_login_tx(conn, login, 0);
1300 }
1301
1302 void iscsit_print_session_params(struct iscsi_session *sess)
1303 {
1304 struct iscsi_conn *conn;
1305
1306 pr_debug("-----------------------------[Session Params for"
1307 " SID: %u]-----------------------------\n", sess->sid);
1308 spin_lock_bh(&sess->conn_lock);
1309 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
1310 iscsi_dump_conn_ops(conn->conn_ops);
1311 spin_unlock_bh(&sess->conn_lock);
1312
1313 iscsi_dump_sess_ops(sess->sess_ops);
1314 }
1315
1316 static int iscsit_do_rx_data(
1317 struct iscsi_conn *conn,
1318 struct iscsi_data_count *count)
1319 {
1320 int data = count->data_length, rx_loop = 0, total_rx = 0, iov_len;
1321 struct kvec *iov_p;
1322 struct msghdr msg;
1323
1324 if (!conn || !conn->sock || !conn->conn_ops)
1325 return -1;
1326
1327 memset(&msg, 0, sizeof(struct msghdr));
1328
1329 iov_p = count->iov;
1330 iov_len = count->iov_count;
1331
1332 while (total_rx < data) {
1333 rx_loop = kernel_recvmsg(conn->sock, &msg, iov_p, iov_len,
1334 (data - total_rx), MSG_WAITALL);
1335 if (rx_loop <= 0) {
1336 pr_debug("rx_loop: %d total_rx: %d\n",
1337 rx_loop, total_rx);
1338 return rx_loop;
1339 }
1340 total_rx += rx_loop;
1341 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n",
1342 rx_loop, total_rx, data);
1343 }
1344
1345 return total_rx;
1346 }
1347
1348 static int iscsit_do_tx_data(
1349 struct iscsi_conn *conn,
1350 struct iscsi_data_count *count)
1351 {
1352 int data = count->data_length, total_tx = 0, tx_loop = 0, iov_len;
1353 struct kvec *iov_p;
1354 struct msghdr msg;
1355
1356 if (!conn || !conn->sock || !conn->conn_ops)
1357 return -1;
1358
1359 if (data <= 0) {
1360 pr_err("Data length is: %d\n", data);
1361 return -1;
1362 }
1363
1364 memset(&msg, 0, sizeof(struct msghdr));
1365
1366 iov_p = count->iov;
1367 iov_len = count->iov_count;
1368
1369 while (total_tx < data) {
1370 tx_loop = kernel_sendmsg(conn->sock, &msg, iov_p, iov_len,
1371 (data - total_tx));
1372 if (tx_loop <= 0) {
1373 pr_debug("tx_loop: %d total_tx %d\n",
1374 tx_loop, total_tx);
1375 return tx_loop;
1376 }
1377 total_tx += tx_loop;
1378 pr_debug("tx_loop: %d, total_tx: %d, data: %d\n",
1379 tx_loop, total_tx, data);
1380 }
1381
1382 return total_tx;
1383 }
1384
1385 int rx_data(
1386 struct iscsi_conn *conn,
1387 struct kvec *iov,
1388 int iov_count,
1389 int data)
1390 {
1391 struct iscsi_data_count c;
1392
1393 if (!conn || !conn->sock || !conn->conn_ops)
1394 return -1;
1395
1396 memset(&c, 0, sizeof(struct iscsi_data_count));
1397 c.iov = iov;
1398 c.iov_count = iov_count;
1399 c.data_length = data;
1400 c.type = ISCSI_RX_DATA;
1401
1402 return iscsit_do_rx_data(conn, &c);
1403 }
1404
1405 int tx_data(
1406 struct iscsi_conn *conn,
1407 struct kvec *iov,
1408 int iov_count,
1409 int data)
1410 {
1411 struct iscsi_data_count c;
1412
1413 if (!conn || !conn->sock || !conn->conn_ops)
1414 return -1;
1415
1416 memset(&c, 0, sizeof(struct iscsi_data_count));
1417 c.iov = iov;
1418 c.iov_count = iov_count;
1419 c.data_length = data;
1420 c.type = ISCSI_TX_DATA;
1421
1422 return iscsit_do_tx_data(conn, &c);
1423 }
1424
1425 void iscsit_collect_login_stats(
1426 struct iscsi_conn *conn,
1427 u8 status_class,
1428 u8 status_detail)
1429 {
1430 struct iscsi_param *intrname = NULL;
1431 struct iscsi_tiqn *tiqn;
1432 struct iscsi_login_stats *ls;
1433
1434 tiqn = iscsit_snmp_get_tiqn(conn);
1435 if (!tiqn)
1436 return;
1437
1438 ls = &tiqn->login_stats;
1439
1440 spin_lock(&ls->lock);
1441 if (!strcmp(conn->login_ip, ls->last_intr_fail_ip_addr) &&
1442 ((get_jiffies_64() - ls->last_fail_time) < 10)) {
1443 /* We already have the failure info for this login */
1444 spin_unlock(&ls->lock);
1445 return;
1446 }
1447
1448 if (status_class == ISCSI_STATUS_CLS_SUCCESS)
1449 ls->accepts++;
1450 else if (status_class == ISCSI_STATUS_CLS_REDIRECT) {
1451 ls->redirects++;
1452 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT;
1453 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1454 (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) {
1455 ls->authenticate_fails++;
1456 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE;
1457 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1458 (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) {
1459 ls->authorize_fails++;
1460 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE;
1461 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1462 (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) {
1463 ls->negotiate_fails++;
1464 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE;
1465 } else {
1466 ls->other_fails++;
1467 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER;
1468 }
1469
1470 /* Save initiator name, ip address and time, if it is a failed login */
1471 if (status_class != ISCSI_STATUS_CLS_SUCCESS) {
1472 if (conn->param_list)
1473 intrname = iscsi_find_param_from_key(INITIATORNAME,
1474 conn->param_list);
1475 strcpy(ls->last_intr_fail_name,
1476 (intrname ? intrname->value : "Unknown"));
1477
1478 ls->last_intr_fail_ip_family = conn->login_family;
1479
1480 snprintf(ls->last_intr_fail_ip_addr, IPV6_ADDRESS_SPACE,
1481 "%s", conn->login_ip);
1482 ls->last_fail_time = get_jiffies_64();
1483 }
1484
1485 spin_unlock(&ls->lock);
1486 }
1487
1488 struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn)
1489 {
1490 struct iscsi_portal_group *tpg;
1491
1492 if (!conn || !conn->sess)
1493 return NULL;
1494
1495 tpg = conn->sess->tpg;
1496 if (!tpg)
1497 return NULL;
1498
1499 if (!tpg->tpg_tiqn)
1500 return NULL;
1501
1502 return tpg->tpg_tiqn;
1503 }
Linux kernel - Deliverables
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