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[mirror_ubuntu-kernels.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/sched/signal.h>
21 #include <net/ipv6.h> /* ipv6_addr_equal() */
22 #include <scsi/scsi_tcq.h>
23 #include <scsi/iscsi_proto.h>
24 #include <target/target_core_base.h>
25 #include <target/target_core_fabric.h>
26 #include <target/iscsi/iscsi_transport.h>
27
28 #include <target/iscsi/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_util.h"
37 #include "iscsi_target.h"
38
39 #define PRINT_BUFF(buff, len) \
40 { \
41 int zzz; \
42 \
43 pr_debug("%d:\n", __LINE__); \
44 for (zzz = 0; zzz < len; zzz++) { \
45 if (zzz % 16 == 0) { \
46 if (zzz) \
47 pr_debug("\n"); \
48 pr_debug("%4i: ", zzz); \
49 } \
50 pr_debug("%02x ", (unsigned char) (buff)[zzz]); \
51 } \
52 if ((len + 1) % 16) \
53 pr_debug("\n"); \
54 }
55
56 extern struct list_head g_tiqn_list;
57 extern spinlock_t tiqn_lock;
58
59 int iscsit_add_r2t_to_list(
60 struct iscsi_cmd *cmd,
61 u32 offset,
62 u32 xfer_len,
63 int recovery,
64 u32 r2t_sn)
65 {
66 struct iscsi_r2t *r2t;
67
68 lockdep_assert_held(&cmd->r2t_lock);
69
70 r2t = kmem_cache_zalloc(lio_r2t_cache, GFP_ATOMIC);
71 if (!r2t) {
72 pr_err("Unable to allocate memory for struct iscsi_r2t.\n");
73 return -1;
74 }
75 INIT_LIST_HEAD(&r2t->r2t_list);
76
77 r2t->recovery_r2t = recovery;
78 r2t->r2t_sn = (!r2t_sn) ? cmd->r2t_sn++ : r2t_sn;
79 r2t->offset = offset;
80 r2t->xfer_len = xfer_len;
81 list_add_tail(&r2t->r2t_list, &cmd->cmd_r2t_list);
82 spin_unlock_bh(&cmd->r2t_lock);
83
84 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, ISTATE_SEND_R2T);
85
86 spin_lock_bh(&cmd->r2t_lock);
87 return 0;
88 }
89
90 struct iscsi_r2t *iscsit_get_r2t_for_eos(
91 struct iscsi_cmd *cmd,
92 u32 offset,
93 u32 length)
94 {
95 struct iscsi_r2t *r2t;
96
97 spin_lock_bh(&cmd->r2t_lock);
98 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
99 if ((r2t->offset <= offset) &&
100 (r2t->offset + r2t->xfer_len) >= (offset + length)) {
101 spin_unlock_bh(&cmd->r2t_lock);
102 return r2t;
103 }
104 }
105 spin_unlock_bh(&cmd->r2t_lock);
106
107 pr_err("Unable to locate R2T for Offset: %u, Length:"
108 " %u\n", offset, length);
109 return NULL;
110 }
111
112 struct iscsi_r2t *iscsit_get_r2t_from_list(struct iscsi_cmd *cmd)
113 {
114 struct iscsi_r2t *r2t;
115
116 spin_lock_bh(&cmd->r2t_lock);
117 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
118 if (!r2t->sent_r2t) {
119 spin_unlock_bh(&cmd->r2t_lock);
120 return r2t;
121 }
122 }
123 spin_unlock_bh(&cmd->r2t_lock);
124
125 pr_err("Unable to locate next R2T to send for ITT:"
126 " 0x%08x.\n", cmd->init_task_tag);
127 return NULL;
128 }
129
130 void iscsit_free_r2t(struct iscsi_r2t *r2t, struct iscsi_cmd *cmd)
131 {
132 lockdep_assert_held(&cmd->r2t_lock);
133
134 list_del(&r2t->r2t_list);
135 kmem_cache_free(lio_r2t_cache, r2t);
136 }
137
138 void iscsit_free_r2ts_from_list(struct iscsi_cmd *cmd)
139 {
140 struct iscsi_r2t *r2t, *r2t_tmp;
141
142 spin_lock_bh(&cmd->r2t_lock);
143 list_for_each_entry_safe(r2t, r2t_tmp, &cmd->cmd_r2t_list, r2t_list)
144 iscsit_free_r2t(r2t, cmd);
145 spin_unlock_bh(&cmd->r2t_lock);
146 }
147
148 static int iscsit_wait_for_tag(struct se_session *se_sess, int state, int *cpup)
149 {
150 int tag = -1;
151 DEFINE_SBQ_WAIT(wait);
152 struct sbq_wait_state *ws;
153 struct sbitmap_queue *sbq;
154
155 if (state == TASK_RUNNING)
156 return tag;
157
158 sbq = &se_sess->sess_tag_pool;
159 ws = &sbq->ws[0];
160 for (;;) {
161 sbitmap_prepare_to_wait(sbq, ws, &wait, state);
162 if (signal_pending_state(state, current))
163 break;
164 tag = sbitmap_queue_get(sbq, cpup);
165 if (tag >= 0)
166 break;
167 schedule();
168 }
169
170 sbitmap_finish_wait(sbq, ws, &wait);
171 return tag;
172 }
173
174 /*
175 * May be called from software interrupt (timer) context for allocating
176 * iSCSI NopINs.
177 */
178 struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *conn, int state)
179 {
180 struct iscsi_cmd *cmd;
181 struct se_session *se_sess = conn->sess->se_sess;
182 int size, tag, cpu;
183
184 tag = sbitmap_queue_get(&se_sess->sess_tag_pool, &cpu);
185 if (tag < 0)
186 tag = iscsit_wait_for_tag(se_sess, state, &cpu);
187 if (tag < 0)
188 return NULL;
189
190 size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;
191 cmd = (struct iscsi_cmd *)(se_sess->sess_cmd_map + (tag * size));
192 memset(cmd, 0, size);
193
194 cmd->se_cmd.map_tag = tag;
195 cmd->se_cmd.map_cpu = cpu;
196 cmd->conn = conn;
197 cmd->data_direction = DMA_NONE;
198 INIT_LIST_HEAD(&cmd->i_conn_node);
199 INIT_LIST_HEAD(&cmd->datain_list);
200 INIT_LIST_HEAD(&cmd->cmd_r2t_list);
201 spin_lock_init(&cmd->datain_lock);
202 spin_lock_init(&cmd->dataout_timeout_lock);
203 spin_lock_init(&cmd->istate_lock);
204 spin_lock_init(&cmd->error_lock);
205 spin_lock_init(&cmd->r2t_lock);
206 timer_setup(&cmd->dataout_timer, iscsit_handle_dataout_timeout, 0);
207
208 return cmd;
209 }
210 EXPORT_SYMBOL(iscsit_allocate_cmd);
211
212 struct iscsi_seq *iscsit_get_seq_holder_for_datain(
213 struct iscsi_cmd *cmd,
214 u32 seq_send_order)
215 {
216 u32 i;
217
218 for (i = 0; i < cmd->seq_count; i++)
219 if (cmd->seq_list[i].seq_send_order == seq_send_order)
220 return &cmd->seq_list[i];
221
222 return NULL;
223 }
224
225 struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsi_cmd *cmd)
226 {
227 u32 i;
228
229 if (!cmd->seq_list) {
230 pr_err("struct iscsi_cmd->seq_list is NULL!\n");
231 return NULL;
232 }
233
234 for (i = 0; i < cmd->seq_count; i++) {
235 if (cmd->seq_list[i].type != SEQTYPE_NORMAL)
236 continue;
237 if (cmd->seq_list[i].seq_send_order == cmd->seq_send_order) {
238 cmd->seq_send_order++;
239 return &cmd->seq_list[i];
240 }
241 }
242
243 return NULL;
244 }
245
246 struct iscsi_r2t *iscsit_get_holder_for_r2tsn(
247 struct iscsi_cmd *cmd,
248 u32 r2t_sn)
249 {
250 struct iscsi_r2t *r2t;
251
252 spin_lock_bh(&cmd->r2t_lock);
253 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
254 if (r2t->r2t_sn == r2t_sn) {
255 spin_unlock_bh(&cmd->r2t_lock);
256 return r2t;
257 }
258 }
259 spin_unlock_bh(&cmd->r2t_lock);
260
261 return NULL;
262 }
263
264 static inline int iscsit_check_received_cmdsn(struct iscsi_session *sess, u32 cmdsn)
265 {
266 u32 max_cmdsn;
267 int ret;
268
269 /*
270 * This is the proper method of checking received CmdSN against
271 * ExpCmdSN and MaxCmdSN values, as well as accounting for out
272 * or order CmdSNs due to multiple connection sessions and/or
273 * CRC failures.
274 */
275 max_cmdsn = atomic_read(&sess->max_cmd_sn);
276 if (iscsi_sna_gt(cmdsn, max_cmdsn)) {
277 pr_err("Received CmdSN: 0x%08x is greater than"
278 " MaxCmdSN: 0x%08x, ignoring.\n", cmdsn, max_cmdsn);
279 ret = CMDSN_MAXCMDSN_OVERRUN;
280
281 } else if (cmdsn == sess->exp_cmd_sn) {
282 sess->exp_cmd_sn++;
283 pr_debug("Received CmdSN matches ExpCmdSN,"
284 " incremented ExpCmdSN to: 0x%08x\n",
285 sess->exp_cmd_sn);
286 ret = CMDSN_NORMAL_OPERATION;
287
288 } else if (iscsi_sna_gt(cmdsn, sess->exp_cmd_sn)) {
289 pr_debug("Received CmdSN: 0x%08x is greater"
290 " than ExpCmdSN: 0x%08x, not acknowledging.\n",
291 cmdsn, sess->exp_cmd_sn);
292 ret = CMDSN_HIGHER_THAN_EXP;
293
294 } else {
295 pr_err("Received CmdSN: 0x%08x is less than"
296 " ExpCmdSN: 0x%08x, ignoring.\n", cmdsn,
297 sess->exp_cmd_sn);
298 ret = CMDSN_LOWER_THAN_EXP;
299 }
300
301 return ret;
302 }
303
304 /*
305 * Commands may be received out of order if MC/S is in use.
306 * Ensure they are executed in CmdSN order.
307 */
308 int iscsit_sequence_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
309 unsigned char *buf, __be32 cmdsn)
310 {
311 int ret, cmdsn_ret;
312 bool reject = false;
313 u8 reason = ISCSI_REASON_BOOKMARK_NO_RESOURCES;
314
315 mutex_lock(&conn->sess->cmdsn_mutex);
316
317 cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, be32_to_cpu(cmdsn));
318 switch (cmdsn_ret) {
319 case CMDSN_NORMAL_OPERATION:
320 ret = iscsit_execute_cmd(cmd, 0);
321 if ((ret >= 0) && !list_empty(&conn->sess->sess_ooo_cmdsn_list))
322 iscsit_execute_ooo_cmdsns(conn->sess);
323 else if (ret < 0) {
324 reject = true;
325 ret = CMDSN_ERROR_CANNOT_RECOVER;
326 }
327 break;
328 case CMDSN_HIGHER_THAN_EXP:
329 ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, be32_to_cpu(cmdsn));
330 if (ret < 0) {
331 reject = true;
332 ret = CMDSN_ERROR_CANNOT_RECOVER;
333 break;
334 }
335 ret = CMDSN_HIGHER_THAN_EXP;
336 break;
337 case CMDSN_LOWER_THAN_EXP:
338 case CMDSN_MAXCMDSN_OVERRUN:
339 default:
340 cmd->i_state = ISTATE_REMOVE;
341 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
342 /*
343 * Existing callers for iscsit_sequence_cmd() will silently
344 * ignore commands with CMDSN_LOWER_THAN_EXP, so force this
345 * return for CMDSN_MAXCMDSN_OVERRUN as well..
346 */
347 ret = CMDSN_LOWER_THAN_EXP;
348 break;
349 }
350 mutex_unlock(&conn->sess->cmdsn_mutex);
351
352 if (reject)
353 iscsit_reject_cmd(cmd, reason, buf);
354
355 return ret;
356 }
357 EXPORT_SYMBOL(iscsit_sequence_cmd);
358
359 int iscsit_check_unsolicited_dataout(struct iscsi_cmd *cmd, unsigned char *buf)
360 {
361 struct iscsi_conn *conn = cmd->conn;
362 struct se_cmd *se_cmd = &cmd->se_cmd;
363 struct iscsi_data *hdr = (struct iscsi_data *) buf;
364 u32 payload_length = ntoh24(hdr->dlength);
365
366 if (conn->sess->sess_ops->InitialR2T) {
367 pr_err("Received unexpected unsolicited data"
368 " while InitialR2T=Yes, protocol error.\n");
369 transport_send_check_condition_and_sense(se_cmd,
370 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
371 return -1;
372 }
373
374 if ((cmd->first_burst_len + payload_length) >
375 conn->sess->sess_ops->FirstBurstLength) {
376 pr_err("Total %u bytes exceeds FirstBurstLength: %u"
377 " for this Unsolicited DataOut Burst.\n",
378 (cmd->first_burst_len + payload_length),
379 conn->sess->sess_ops->FirstBurstLength);
380 transport_send_check_condition_and_sense(se_cmd,
381 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
382 return -1;
383 }
384
385 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))
386 return 0;
387
388 if (((cmd->first_burst_len + payload_length) != cmd->se_cmd.data_length) &&
389 ((cmd->first_burst_len + payload_length) !=
390 conn->sess->sess_ops->FirstBurstLength)) {
391 pr_err("Unsolicited non-immediate data received %u"
392 " does not equal FirstBurstLength: %u, and does"
393 " not equal ExpXferLen %u.\n",
394 (cmd->first_burst_len + payload_length),
395 conn->sess->sess_ops->FirstBurstLength, cmd->se_cmd.data_length);
396 transport_send_check_condition_and_sense(se_cmd,
397 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
398 return -1;
399 }
400 return 0;
401 }
402
403 struct iscsi_cmd *iscsit_find_cmd_from_itt(
404 struct iscsi_conn *conn,
405 itt_t init_task_tag)
406 {
407 struct iscsi_cmd *cmd;
408
409 spin_lock_bh(&conn->cmd_lock);
410 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
411 if (cmd->init_task_tag == init_task_tag) {
412 spin_unlock_bh(&conn->cmd_lock);
413 return cmd;
414 }
415 }
416 spin_unlock_bh(&conn->cmd_lock);
417
418 pr_err("Unable to locate ITT: 0x%08x on CID: %hu",
419 init_task_tag, conn->cid);
420 return NULL;
421 }
422 EXPORT_SYMBOL(iscsit_find_cmd_from_itt);
423
424 struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump(
425 struct iscsi_conn *conn,
426 itt_t init_task_tag,
427 u32 length)
428 {
429 struct iscsi_cmd *cmd;
430
431 spin_lock_bh(&conn->cmd_lock);
432 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
433 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT)
434 continue;
435 if (cmd->init_task_tag == init_task_tag) {
436 spin_unlock_bh(&conn->cmd_lock);
437 return cmd;
438 }
439 }
440 spin_unlock_bh(&conn->cmd_lock);
441
442 pr_err("Unable to locate ITT: 0x%08x on CID: %hu,"
443 " dumping payload\n", init_task_tag, conn->cid);
444 if (length)
445 iscsit_dump_data_payload(conn, length, 1);
446
447 return NULL;
448 }
449 EXPORT_SYMBOL(iscsit_find_cmd_from_itt_or_dump);
450
451 struct iscsi_cmd *iscsit_find_cmd_from_ttt(
452 struct iscsi_conn *conn,
453 u32 targ_xfer_tag)
454 {
455 struct iscsi_cmd *cmd = NULL;
456
457 spin_lock_bh(&conn->cmd_lock);
458 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
459 if (cmd->targ_xfer_tag == targ_xfer_tag) {
460 spin_unlock_bh(&conn->cmd_lock);
461 return cmd;
462 }
463 }
464 spin_unlock_bh(&conn->cmd_lock);
465
466 pr_err("Unable to locate TTT: 0x%08x on CID: %hu\n",
467 targ_xfer_tag, conn->cid);
468 return NULL;
469 }
470
471 int iscsit_find_cmd_for_recovery(
472 struct iscsi_session *sess,
473 struct iscsi_cmd **cmd_ptr,
474 struct iscsi_conn_recovery **cr_ptr,
475 itt_t init_task_tag)
476 {
477 struct iscsi_cmd *cmd = NULL;
478 struct iscsi_conn_recovery *cr;
479 /*
480 * Scan through the inactive connection recovery list's command list.
481 * If init_task_tag matches the command is still alligent.
482 */
483 spin_lock(&sess->cr_i_lock);
484 list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) {
485 spin_lock(&cr->conn_recovery_cmd_lock);
486 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
487 if (cmd->init_task_tag == init_task_tag) {
488 spin_unlock(&cr->conn_recovery_cmd_lock);
489 spin_unlock(&sess->cr_i_lock);
490
491 *cr_ptr = cr;
492 *cmd_ptr = cmd;
493 return -2;
494 }
495 }
496 spin_unlock(&cr->conn_recovery_cmd_lock);
497 }
498 spin_unlock(&sess->cr_i_lock);
499 /*
500 * Scan through the active connection recovery list's command list.
501 * If init_task_tag matches the command is ready to be reassigned.
502 */
503 spin_lock(&sess->cr_a_lock);
504 list_for_each_entry(cr, &sess->cr_active_list, cr_list) {
505 spin_lock(&cr->conn_recovery_cmd_lock);
506 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
507 if (cmd->init_task_tag == init_task_tag) {
508 spin_unlock(&cr->conn_recovery_cmd_lock);
509 spin_unlock(&sess->cr_a_lock);
510
511 *cr_ptr = cr;
512 *cmd_ptr = cmd;
513 return 0;
514 }
515 }
516 spin_unlock(&cr->conn_recovery_cmd_lock);
517 }
518 spin_unlock(&sess->cr_a_lock);
519
520 return -1;
521 }
522
523 void iscsit_add_cmd_to_immediate_queue(
524 struct iscsi_cmd *cmd,
525 struct iscsi_conn *conn,
526 u8 state)
527 {
528 struct iscsi_queue_req *qr;
529
530 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
531 if (!qr) {
532 pr_err("Unable to allocate memory for"
533 " struct iscsi_queue_req\n");
534 return;
535 }
536 INIT_LIST_HEAD(&qr->qr_list);
537 qr->cmd = cmd;
538 qr->state = state;
539
540 spin_lock_bh(&conn->immed_queue_lock);
541 list_add_tail(&qr->qr_list, &conn->immed_queue_list);
542 atomic_inc(&cmd->immed_queue_count);
543 atomic_set(&conn->check_immediate_queue, 1);
544 spin_unlock_bh(&conn->immed_queue_lock);
545
546 wake_up(&conn->queues_wq);
547 }
548 EXPORT_SYMBOL(iscsit_add_cmd_to_immediate_queue);
549
550 struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *conn)
551 {
552 struct iscsi_queue_req *qr;
553
554 spin_lock_bh(&conn->immed_queue_lock);
555 if (list_empty(&conn->immed_queue_list)) {
556 spin_unlock_bh(&conn->immed_queue_lock);
557 return NULL;
558 }
559 qr = list_first_entry(&conn->immed_queue_list,
560 struct iscsi_queue_req, qr_list);
561
562 list_del(&qr->qr_list);
563 if (qr->cmd)
564 atomic_dec(&qr->cmd->immed_queue_count);
565 spin_unlock_bh(&conn->immed_queue_lock);
566
567 return qr;
568 }
569
570 static void iscsit_remove_cmd_from_immediate_queue(
571 struct iscsi_cmd *cmd,
572 struct iscsi_conn *conn)
573 {
574 struct iscsi_queue_req *qr, *qr_tmp;
575
576 spin_lock_bh(&conn->immed_queue_lock);
577 if (!atomic_read(&cmd->immed_queue_count)) {
578 spin_unlock_bh(&conn->immed_queue_lock);
579 return;
580 }
581
582 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
583 if (qr->cmd != cmd)
584 continue;
585
586 atomic_dec(&qr->cmd->immed_queue_count);
587 list_del(&qr->qr_list);
588 kmem_cache_free(lio_qr_cache, qr);
589 }
590 spin_unlock_bh(&conn->immed_queue_lock);
591
592 if (atomic_read(&cmd->immed_queue_count)) {
593 pr_err("ITT: 0x%08x immed_queue_count: %d\n",
594 cmd->init_task_tag,
595 atomic_read(&cmd->immed_queue_count));
596 }
597 }
598
599 int iscsit_add_cmd_to_response_queue(
600 struct iscsi_cmd *cmd,
601 struct iscsi_conn *conn,
602 u8 state)
603 {
604 struct iscsi_queue_req *qr;
605
606 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
607 if (!qr) {
608 pr_err("Unable to allocate memory for"
609 " struct iscsi_queue_req\n");
610 return -ENOMEM;
611 }
612 INIT_LIST_HEAD(&qr->qr_list);
613 qr->cmd = cmd;
614 qr->state = state;
615
616 spin_lock_bh(&conn->response_queue_lock);
617 list_add_tail(&qr->qr_list, &conn->response_queue_list);
618 atomic_inc(&cmd->response_queue_count);
619 spin_unlock_bh(&conn->response_queue_lock);
620
621 wake_up(&conn->queues_wq);
622 return 0;
623 }
624
625 struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *conn)
626 {
627 struct iscsi_queue_req *qr;
628
629 spin_lock_bh(&conn->response_queue_lock);
630 if (list_empty(&conn->response_queue_list)) {
631 spin_unlock_bh(&conn->response_queue_lock);
632 return NULL;
633 }
634
635 qr = list_first_entry(&conn->response_queue_list,
636 struct iscsi_queue_req, qr_list);
637
638 list_del(&qr->qr_list);
639 if (qr->cmd)
640 atomic_dec(&qr->cmd->response_queue_count);
641 spin_unlock_bh(&conn->response_queue_lock);
642
643 return qr;
644 }
645
646 static void iscsit_remove_cmd_from_response_queue(
647 struct iscsi_cmd *cmd,
648 struct iscsi_conn *conn)
649 {
650 struct iscsi_queue_req *qr, *qr_tmp;
651
652 spin_lock_bh(&conn->response_queue_lock);
653 if (!atomic_read(&cmd->response_queue_count)) {
654 spin_unlock_bh(&conn->response_queue_lock);
655 return;
656 }
657
658 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
659 qr_list) {
660 if (qr->cmd != cmd)
661 continue;
662
663 atomic_dec(&qr->cmd->response_queue_count);
664 list_del(&qr->qr_list);
665 kmem_cache_free(lio_qr_cache, qr);
666 }
667 spin_unlock_bh(&conn->response_queue_lock);
668
669 if (atomic_read(&cmd->response_queue_count)) {
670 pr_err("ITT: 0x%08x response_queue_count: %d\n",
671 cmd->init_task_tag,
672 atomic_read(&cmd->response_queue_count));
673 }
674 }
675
676 bool iscsit_conn_all_queues_empty(struct iscsi_conn *conn)
677 {
678 bool empty;
679
680 spin_lock_bh(&conn->immed_queue_lock);
681 empty = list_empty(&conn->immed_queue_list);
682 spin_unlock_bh(&conn->immed_queue_lock);
683
684 if (!empty)
685 return empty;
686
687 spin_lock_bh(&conn->response_queue_lock);
688 empty = list_empty(&conn->response_queue_list);
689 spin_unlock_bh(&conn->response_queue_lock);
690
691 return empty;
692 }
693
694 void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn)
695 {
696 struct iscsi_queue_req *qr, *qr_tmp;
697
698 spin_lock_bh(&conn->immed_queue_lock);
699 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
700 list_del(&qr->qr_list);
701 if (qr->cmd)
702 atomic_dec(&qr->cmd->immed_queue_count);
703
704 kmem_cache_free(lio_qr_cache, qr);
705 }
706 spin_unlock_bh(&conn->immed_queue_lock);
707
708 spin_lock_bh(&conn->response_queue_lock);
709 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
710 qr_list) {
711 list_del(&qr->qr_list);
712 if (qr->cmd)
713 atomic_dec(&qr->cmd->response_queue_count);
714
715 kmem_cache_free(lio_qr_cache, qr);
716 }
717 spin_unlock_bh(&conn->response_queue_lock);
718 }
719
720 void iscsit_release_cmd(struct iscsi_cmd *cmd)
721 {
722 struct iscsi_session *sess;
723 struct se_cmd *se_cmd = &cmd->se_cmd;
724
725 WARN_ON(!list_empty(&cmd->i_conn_node));
726
727 if (cmd->conn)
728 sess = cmd->conn->sess;
729 else
730 sess = cmd->sess;
731
732 BUG_ON(!sess || !sess->se_sess);
733
734 kfree(cmd->buf_ptr);
735 kfree(cmd->pdu_list);
736 kfree(cmd->seq_list);
737 kfree(cmd->tmr_req);
738 kfree(cmd->iov_data);
739 kfree(cmd->text_in_ptr);
740
741 target_free_tag(sess->se_sess, se_cmd);
742 }
743 EXPORT_SYMBOL(iscsit_release_cmd);
744
745 void __iscsit_free_cmd(struct iscsi_cmd *cmd, bool check_queues)
746 {
747 struct iscsi_conn *conn = cmd->conn;
748
749 WARN_ON(!list_empty(&cmd->i_conn_node));
750
751 if (cmd->data_direction == DMA_TO_DEVICE) {
752 iscsit_stop_dataout_timer(cmd);
753 iscsit_free_r2ts_from_list(cmd);
754 }
755 if (cmd->data_direction == DMA_FROM_DEVICE)
756 iscsit_free_all_datain_reqs(cmd);
757
758 if (conn && check_queues) {
759 iscsit_remove_cmd_from_immediate_queue(cmd, conn);
760 iscsit_remove_cmd_from_response_queue(cmd, conn);
761 }
762
763 if (conn && conn->conn_transport->iscsit_unmap_cmd)
764 conn->conn_transport->iscsit_unmap_cmd(conn, cmd);
765 }
766
767 void iscsit_free_cmd(struct iscsi_cmd *cmd, bool shutdown)
768 {
769 struct se_cmd *se_cmd = cmd->se_cmd.se_tfo ? &cmd->se_cmd : NULL;
770 int rc;
771
772 __iscsit_free_cmd(cmd, shutdown);
773 if (se_cmd) {
774 rc = transport_generic_free_cmd(se_cmd, shutdown);
775 if (!rc && shutdown && se_cmd->se_sess) {
776 __iscsit_free_cmd(cmd, shutdown);
777 target_put_sess_cmd(se_cmd);
778 }
779 } else {
780 iscsit_release_cmd(cmd);
781 }
782 }
783 EXPORT_SYMBOL(iscsit_free_cmd);
784
785 int iscsit_check_session_usage_count(struct iscsi_session *sess)
786 {
787 spin_lock_bh(&sess->session_usage_lock);
788 if (sess->session_usage_count != 0) {
789 sess->session_waiting_on_uc = 1;
790 spin_unlock_bh(&sess->session_usage_lock);
791 if (in_interrupt())
792 return 2;
793
794 wait_for_completion(&sess->session_waiting_on_uc_comp);
795 return 1;
796 }
797 spin_unlock_bh(&sess->session_usage_lock);
798
799 return 0;
800 }
801
802 void iscsit_dec_session_usage_count(struct iscsi_session *sess)
803 {
804 spin_lock_bh(&sess->session_usage_lock);
805 sess->session_usage_count--;
806
807 if (!sess->session_usage_count && sess->session_waiting_on_uc)
808 complete(&sess->session_waiting_on_uc_comp);
809
810 spin_unlock_bh(&sess->session_usage_lock);
811 }
812
813 void iscsit_inc_session_usage_count(struct iscsi_session *sess)
814 {
815 spin_lock_bh(&sess->session_usage_lock);
816 sess->session_usage_count++;
817 spin_unlock_bh(&sess->session_usage_lock);
818 }
819
820 struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid)
821 {
822 struct iscsi_conn *conn;
823
824 spin_lock_bh(&sess->conn_lock);
825 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
826 if ((conn->cid == cid) &&
827 (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) {
828 iscsit_inc_conn_usage_count(conn);
829 spin_unlock_bh(&sess->conn_lock);
830 return conn;
831 }
832 }
833 spin_unlock_bh(&sess->conn_lock);
834
835 return NULL;
836 }
837
838 struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid)
839 {
840 struct iscsi_conn *conn;
841
842 spin_lock_bh(&sess->conn_lock);
843 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
844 if (conn->cid == cid) {
845 iscsit_inc_conn_usage_count(conn);
846 spin_lock(&conn->state_lock);
847 atomic_set(&conn->connection_wait_rcfr, 1);
848 spin_unlock(&conn->state_lock);
849 spin_unlock_bh(&sess->conn_lock);
850 return conn;
851 }
852 }
853 spin_unlock_bh(&sess->conn_lock);
854
855 return NULL;
856 }
857
858 void iscsit_check_conn_usage_count(struct iscsi_conn *conn)
859 {
860 spin_lock_bh(&conn->conn_usage_lock);
861 if (conn->conn_usage_count != 0) {
862 conn->conn_waiting_on_uc = 1;
863 spin_unlock_bh(&conn->conn_usage_lock);
864
865 wait_for_completion(&conn->conn_waiting_on_uc_comp);
866 return;
867 }
868 spin_unlock_bh(&conn->conn_usage_lock);
869 }
870
871 void iscsit_dec_conn_usage_count(struct iscsi_conn *conn)
872 {
873 spin_lock_bh(&conn->conn_usage_lock);
874 conn->conn_usage_count--;
875
876 if (!conn->conn_usage_count && conn->conn_waiting_on_uc)
877 complete(&conn->conn_waiting_on_uc_comp);
878
879 spin_unlock_bh(&conn->conn_usage_lock);
880 }
881
882 void iscsit_inc_conn_usage_count(struct iscsi_conn *conn)
883 {
884 spin_lock_bh(&conn->conn_usage_lock);
885 conn->conn_usage_count++;
886 spin_unlock_bh(&conn->conn_usage_lock);
887 }
888
889 static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response)
890 {
891 u8 state;
892 struct iscsi_cmd *cmd;
893
894 cmd = iscsit_allocate_cmd(conn, TASK_RUNNING);
895 if (!cmd)
896 return -1;
897
898 cmd->iscsi_opcode = ISCSI_OP_NOOP_IN;
899 state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE :
900 ISTATE_SEND_NOPIN_NO_RESPONSE;
901 cmd->init_task_tag = RESERVED_ITT;
902 cmd->targ_xfer_tag = (want_response) ?
903 session_get_next_ttt(conn->sess) : 0xFFFFFFFF;
904 spin_lock_bh(&conn->cmd_lock);
905 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
906 spin_unlock_bh(&conn->cmd_lock);
907
908 if (want_response)
909 iscsit_start_nopin_response_timer(conn);
910 iscsit_add_cmd_to_immediate_queue(cmd, conn, state);
911
912 return 0;
913 }
914
915 void iscsit_handle_nopin_response_timeout(struct timer_list *t)
916 {
917 struct iscsi_conn *conn = from_timer(conn, t, nopin_response_timer);
918 struct iscsi_session *sess = conn->sess;
919
920 iscsit_inc_conn_usage_count(conn);
921
922 spin_lock_bh(&conn->nopin_timer_lock);
923 if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) {
924 spin_unlock_bh(&conn->nopin_timer_lock);
925 iscsit_dec_conn_usage_count(conn);
926 return;
927 }
928
929 pr_err("Did not receive response to NOPIN on CID: %hu, failing"
930 " connection for I_T Nexus %s,i,0x%6phN,%s,t,0x%02x\n",
931 conn->cid, sess->sess_ops->InitiatorName, sess->isid,
932 sess->tpg->tpg_tiqn->tiqn, (u32)sess->tpg->tpgt);
933 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
934 spin_unlock_bh(&conn->nopin_timer_lock);
935
936 iscsit_fill_cxn_timeout_err_stats(sess);
937 iscsit_cause_connection_reinstatement(conn, 0);
938 iscsit_dec_conn_usage_count(conn);
939 }
940
941 void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn)
942 {
943 struct iscsi_session *sess = conn->sess;
944 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
945
946 spin_lock_bh(&conn->nopin_timer_lock);
947 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
948 spin_unlock_bh(&conn->nopin_timer_lock);
949 return;
950 }
951
952 mod_timer(&conn->nopin_response_timer,
953 (get_jiffies_64() + na->nopin_response_timeout * HZ));
954 spin_unlock_bh(&conn->nopin_timer_lock);
955 }
956
957 void iscsit_start_nopin_response_timer(struct iscsi_conn *conn)
958 {
959 struct iscsi_session *sess = conn->sess;
960 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
961
962 spin_lock_bh(&conn->nopin_timer_lock);
963 if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) {
964 spin_unlock_bh(&conn->nopin_timer_lock);
965 return;
966 }
967
968 conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP;
969 conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING;
970 mod_timer(&conn->nopin_response_timer,
971 jiffies + na->nopin_response_timeout * HZ);
972
973 pr_debug("Started NOPIN Response Timer on CID: %d to %u"
974 " seconds\n", conn->cid, na->nopin_response_timeout);
975 spin_unlock_bh(&conn->nopin_timer_lock);
976 }
977
978 void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn)
979 {
980 spin_lock_bh(&conn->nopin_timer_lock);
981 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
982 spin_unlock_bh(&conn->nopin_timer_lock);
983 return;
984 }
985 conn->nopin_response_timer_flags |= ISCSI_TF_STOP;
986 spin_unlock_bh(&conn->nopin_timer_lock);
987
988 del_timer_sync(&conn->nopin_response_timer);
989
990 spin_lock_bh(&conn->nopin_timer_lock);
991 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
992 spin_unlock_bh(&conn->nopin_timer_lock);
993 }
994
995 void iscsit_handle_nopin_timeout(struct timer_list *t)
996 {
997 struct iscsi_conn *conn = from_timer(conn, t, nopin_timer);
998
999 iscsit_inc_conn_usage_count(conn);
1000
1001 spin_lock_bh(&conn->nopin_timer_lock);
1002 if (conn->nopin_timer_flags & ISCSI_TF_STOP) {
1003 spin_unlock_bh(&conn->nopin_timer_lock);
1004 iscsit_dec_conn_usage_count(conn);
1005 return;
1006 }
1007 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1008 spin_unlock_bh(&conn->nopin_timer_lock);
1009
1010 iscsit_add_nopin(conn, 1);
1011 iscsit_dec_conn_usage_count(conn);
1012 }
1013
1014 void __iscsit_start_nopin_timer(struct iscsi_conn *conn)
1015 {
1016 struct iscsi_session *sess = conn->sess;
1017 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1018
1019 lockdep_assert_held(&conn->nopin_timer_lock);
1020
1021 /*
1022 * NOPIN timeout is disabled.
1023 */
1024 if (!na->nopin_timeout)
1025 return;
1026
1027 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING)
1028 return;
1029
1030 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1031 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1032 mod_timer(&conn->nopin_timer, jiffies + na->nopin_timeout * HZ);
1033
1034 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1035 " interval\n", conn->cid, na->nopin_timeout);
1036 }
1037
1038 void iscsit_start_nopin_timer(struct iscsi_conn *conn)
1039 {
1040 spin_lock_bh(&conn->nopin_timer_lock);
1041 __iscsit_start_nopin_timer(conn);
1042 spin_unlock_bh(&conn->nopin_timer_lock);
1043 }
1044
1045 void iscsit_stop_nopin_timer(struct iscsi_conn *conn)
1046 {
1047 spin_lock_bh(&conn->nopin_timer_lock);
1048 if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) {
1049 spin_unlock_bh(&conn->nopin_timer_lock);
1050 return;
1051 }
1052 conn->nopin_timer_flags |= ISCSI_TF_STOP;
1053 spin_unlock_bh(&conn->nopin_timer_lock);
1054
1055 del_timer_sync(&conn->nopin_timer);
1056
1057 spin_lock_bh(&conn->nopin_timer_lock);
1058 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1059 spin_unlock_bh(&conn->nopin_timer_lock);
1060 }
1061
1062 int iscsit_send_tx_data(
1063 struct iscsi_cmd *cmd,
1064 struct iscsi_conn *conn,
1065 int use_misc)
1066 {
1067 int tx_sent, tx_size;
1068 u32 iov_count;
1069 struct kvec *iov;
1070
1071 send_data:
1072 tx_size = cmd->tx_size;
1073
1074 if (!use_misc) {
1075 iov = &cmd->iov_data[0];
1076 iov_count = cmd->iov_data_count;
1077 } else {
1078 iov = &cmd->iov_misc[0];
1079 iov_count = cmd->iov_misc_count;
1080 }
1081
1082 tx_sent = tx_data(conn, &iov[0], iov_count, tx_size);
1083 if (tx_size != tx_sent) {
1084 if (tx_sent == -EAGAIN) {
1085 pr_err("tx_data() returned -EAGAIN\n");
1086 goto send_data;
1087 } else
1088 return -1;
1089 }
1090 cmd->tx_size = 0;
1091
1092 return 0;
1093 }
1094
1095 int iscsit_fe_sendpage_sg(
1096 struct iscsi_cmd *cmd,
1097 struct iscsi_conn *conn)
1098 {
1099 struct scatterlist *sg = cmd->first_data_sg;
1100 struct kvec iov;
1101 u32 tx_hdr_size, data_len;
1102 u32 offset = cmd->first_data_sg_off;
1103 int tx_sent, iov_off;
1104
1105 send_hdr:
1106 tx_hdr_size = ISCSI_HDR_LEN;
1107 if (conn->conn_ops->HeaderDigest)
1108 tx_hdr_size += ISCSI_CRC_LEN;
1109
1110 iov.iov_base = cmd->pdu;
1111 iov.iov_len = tx_hdr_size;
1112
1113 tx_sent = tx_data(conn, &iov, 1, tx_hdr_size);
1114 if (tx_hdr_size != tx_sent) {
1115 if (tx_sent == -EAGAIN) {
1116 pr_err("tx_data() returned -EAGAIN\n");
1117 goto send_hdr;
1118 }
1119 return -1;
1120 }
1121
1122 data_len = cmd->tx_size - tx_hdr_size - cmd->padding;
1123 /*
1124 * Set iov_off used by padding and data digest tx_data() calls below
1125 * in order to determine proper offset into cmd->iov_data[]
1126 */
1127 if (conn->conn_ops->DataDigest) {
1128 data_len -= ISCSI_CRC_LEN;
1129 if (cmd->padding)
1130 iov_off = (cmd->iov_data_count - 2);
1131 else
1132 iov_off = (cmd->iov_data_count - 1);
1133 } else {
1134 iov_off = (cmd->iov_data_count - 1);
1135 }
1136 /*
1137 * Perform sendpage() for each page in the scatterlist
1138 */
1139 while (data_len) {
1140 u32 space = (sg->length - offset);
1141 u32 sub_len = min_t(u32, data_len, space);
1142 send_pg:
1143 tx_sent = conn->sock->ops->sendpage(conn->sock,
1144 sg_page(sg), sg->offset + offset, sub_len, 0);
1145 if (tx_sent != sub_len) {
1146 if (tx_sent == -EAGAIN) {
1147 pr_err("tcp_sendpage() returned"
1148 " -EAGAIN\n");
1149 goto send_pg;
1150 }
1151
1152 pr_err("tcp_sendpage() failure: %d\n",
1153 tx_sent);
1154 return -1;
1155 }
1156
1157 data_len -= sub_len;
1158 offset = 0;
1159 sg = sg_next(sg);
1160 }
1161
1162 send_padding:
1163 if (cmd->padding) {
1164 struct kvec *iov_p = &cmd->iov_data[iov_off++];
1165
1166 tx_sent = tx_data(conn, iov_p, 1, cmd->padding);
1167 if (cmd->padding != tx_sent) {
1168 if (tx_sent == -EAGAIN) {
1169 pr_err("tx_data() returned -EAGAIN\n");
1170 goto send_padding;
1171 }
1172 return -1;
1173 }
1174 }
1175
1176 send_datacrc:
1177 if (conn->conn_ops->DataDigest) {
1178 struct kvec *iov_d = &cmd->iov_data[iov_off];
1179
1180 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN);
1181 if (ISCSI_CRC_LEN != tx_sent) {
1182 if (tx_sent == -EAGAIN) {
1183 pr_err("tx_data() returned -EAGAIN\n");
1184 goto send_datacrc;
1185 }
1186 return -1;
1187 }
1188 }
1189
1190 return 0;
1191 }
1192
1193 /*
1194 * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU
1195 * back to the Initiator when an expection condition occurs with the
1196 * errors set in status_class and status_detail.
1197 *
1198 * Parameters: iSCSI Connection, Status Class, Status Detail.
1199 * Returns: 0 on success, -1 on error.
1200 */
1201 int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail)
1202 {
1203 struct iscsi_login_rsp *hdr;
1204 struct iscsi_login *login = conn->conn_login;
1205
1206 login->login_failed = 1;
1207 iscsit_collect_login_stats(conn, status_class, status_detail);
1208
1209 memset(&login->rsp[0], 0, ISCSI_HDR_LEN);
1210
1211 hdr = (struct iscsi_login_rsp *)&login->rsp[0];
1212 hdr->opcode = ISCSI_OP_LOGIN_RSP;
1213 hdr->status_class = status_class;
1214 hdr->status_detail = status_detail;
1215 hdr->itt = conn->login_itt;
1216
1217 return conn->conn_transport->iscsit_put_login_tx(conn, login, 0);
1218 }
1219
1220 void iscsit_print_session_params(struct iscsi_session *sess)
1221 {
1222 struct iscsi_conn *conn;
1223
1224 pr_debug("-----------------------------[Session Params for"
1225 " SID: %u]-----------------------------\n", sess->sid);
1226 spin_lock_bh(&sess->conn_lock);
1227 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
1228 iscsi_dump_conn_ops(conn->conn_ops);
1229 spin_unlock_bh(&sess->conn_lock);
1230
1231 iscsi_dump_sess_ops(sess->sess_ops);
1232 }
1233
1234 static int iscsit_do_rx_data(
1235 struct iscsi_conn *conn,
1236 struct iscsi_data_count *count)
1237 {
1238 int data = count->data_length, rx_loop = 0, total_rx = 0;
1239 struct msghdr msg;
1240
1241 if (!conn || !conn->sock || !conn->conn_ops)
1242 return -1;
1243
1244 memset(&msg, 0, sizeof(struct msghdr));
1245 iov_iter_kvec(&msg.msg_iter, READ, count->iov, count->iov_count, data);
1246
1247 while (msg_data_left(&msg)) {
1248 rx_loop = sock_recvmsg(conn->sock, &msg, MSG_WAITALL);
1249 if (rx_loop <= 0) {
1250 pr_debug("rx_loop: %d total_rx: %d\n",
1251 rx_loop, total_rx);
1252 return rx_loop;
1253 }
1254 total_rx += rx_loop;
1255 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n",
1256 rx_loop, total_rx, data);
1257 }
1258
1259 return total_rx;
1260 }
1261
1262 int rx_data(
1263 struct iscsi_conn *conn,
1264 struct kvec *iov,
1265 int iov_count,
1266 int data)
1267 {
1268 struct iscsi_data_count c;
1269
1270 if (!conn || !conn->sock || !conn->conn_ops)
1271 return -1;
1272
1273 memset(&c, 0, sizeof(struct iscsi_data_count));
1274 c.iov = iov;
1275 c.iov_count = iov_count;
1276 c.data_length = data;
1277 c.type = ISCSI_RX_DATA;
1278
1279 return iscsit_do_rx_data(conn, &c);
1280 }
1281
1282 int tx_data(
1283 struct iscsi_conn *conn,
1284 struct kvec *iov,
1285 int iov_count,
1286 int data)
1287 {
1288 struct msghdr msg;
1289 int total_tx = 0;
1290
1291 if (!conn || !conn->sock || !conn->conn_ops)
1292 return -1;
1293
1294 if (data <= 0) {
1295 pr_err("Data length is: %d\n", data);
1296 return -1;
1297 }
1298
1299 memset(&msg, 0, sizeof(struct msghdr));
1300
1301 iov_iter_kvec(&msg.msg_iter, WRITE, iov, iov_count, data);
1302
1303 while (msg_data_left(&msg)) {
1304 int tx_loop = sock_sendmsg(conn->sock, &msg);
1305 if (tx_loop <= 0) {
1306 pr_debug("tx_loop: %d total_tx %d\n",
1307 tx_loop, total_tx);
1308 return tx_loop;
1309 }
1310 total_tx += tx_loop;
1311 pr_debug("tx_loop: %d, total_tx: %d, data: %d\n",
1312 tx_loop, total_tx, data);
1313 }
1314
1315 return total_tx;
1316 }
1317
1318 void iscsit_collect_login_stats(
1319 struct iscsi_conn *conn,
1320 u8 status_class,
1321 u8 status_detail)
1322 {
1323 struct iscsi_param *intrname = NULL;
1324 struct iscsi_tiqn *tiqn;
1325 struct iscsi_login_stats *ls;
1326
1327 tiqn = iscsit_snmp_get_tiqn(conn);
1328 if (!tiqn)
1329 return;
1330
1331 ls = &tiqn->login_stats;
1332
1333 spin_lock(&ls->lock);
1334 if (status_class == ISCSI_STATUS_CLS_SUCCESS)
1335 ls->accepts++;
1336 else if (status_class == ISCSI_STATUS_CLS_REDIRECT) {
1337 ls->redirects++;
1338 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT;
1339 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1340 (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) {
1341 ls->authenticate_fails++;
1342 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE;
1343 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1344 (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) {
1345 ls->authorize_fails++;
1346 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE;
1347 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1348 (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) {
1349 ls->negotiate_fails++;
1350 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE;
1351 } else {
1352 ls->other_fails++;
1353 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER;
1354 }
1355
1356 /* Save initiator name, ip address and time, if it is a failed login */
1357 if (status_class != ISCSI_STATUS_CLS_SUCCESS) {
1358 if (conn->param_list)
1359 intrname = iscsi_find_param_from_key(INITIATORNAME,
1360 conn->param_list);
1361 strlcpy(ls->last_intr_fail_name,
1362 (intrname ? intrname->value : "Unknown"),
1363 sizeof(ls->last_intr_fail_name));
1364
1365 ls->last_intr_fail_ip_family = conn->login_family;
1366
1367 ls->last_intr_fail_sockaddr = conn->login_sockaddr;
1368 ls->last_fail_time = get_jiffies_64();
1369 }
1370
1371 spin_unlock(&ls->lock);
1372 }
1373
1374 struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn)
1375 {
1376 struct iscsi_portal_group *tpg;
1377
1378 if (!conn)
1379 return NULL;
1380
1381 tpg = conn->tpg;
1382 if (!tpg)
1383 return NULL;
1384
1385 if (!tpg->tpg_tiqn)
1386 return NULL;
1387
1388 return tpg->tpg_tiqn;
1389 }
1390
1391 void iscsit_fill_cxn_timeout_err_stats(struct iscsi_session *sess)
1392 {
1393 struct iscsi_portal_group *tpg = sess->tpg;
1394 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
1395
1396 if (!tiqn)
1397 return;
1398
1399 spin_lock_bh(&tiqn->sess_err_stats.lock);
1400 strlcpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
1401 sess->sess_ops->InitiatorName,
1402 sizeof(tiqn->sess_err_stats.last_sess_fail_rem_name));
1403 tiqn->sess_err_stats.last_sess_failure_type =
1404 ISCSI_SESS_ERR_CXN_TIMEOUT;
1405 tiqn->sess_err_stats.cxn_timeout_errors++;
1406 atomic_long_inc(&sess->conn_timeout_errors);
1407 spin_unlock_bh(&tiqn->sess_err_stats.lock);
1408 }
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