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UBUNTU: Ubuntu-4.15.0-96.97
[mirror_ubuntu-bionic-kernel.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 <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 /*
60 * Called with cmd->r2t_lock held.
61 */
62 int iscsit_add_r2t_to_list(
63 struct iscsi_cmd *cmd,
64 u32 offset,
65 u32 xfer_len,
66 int recovery,
67 u32 r2t_sn)
68 {
69 struct iscsi_r2t *r2t;
70
71 r2t = kmem_cache_zalloc(lio_r2t_cache, GFP_ATOMIC);
72 if (!r2t) {
73 pr_err("Unable to allocate memory for struct iscsi_r2t.\n");
74 return -1;
75 }
76 INIT_LIST_HEAD(&r2t->r2t_list);
77
78 r2t->recovery_r2t = recovery;
79 r2t->r2t_sn = (!r2t_sn) ? cmd->r2t_sn++ : r2t_sn;
80 r2t->offset = offset;
81 r2t->xfer_len = xfer_len;
82 list_add_tail(&r2t->r2t_list, &cmd->cmd_r2t_list);
83 spin_unlock_bh(&cmd->r2t_lock);
84
85 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, ISTATE_SEND_R2T);
86
87 spin_lock_bh(&cmd->r2t_lock);
88 return 0;
89 }
90
91 struct iscsi_r2t *iscsit_get_r2t_for_eos(
92 struct iscsi_cmd *cmd,
93 u32 offset,
94 u32 length)
95 {
96 struct iscsi_r2t *r2t;
97
98 spin_lock_bh(&cmd->r2t_lock);
99 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
100 if ((r2t->offset <= offset) &&
101 (r2t->offset + r2t->xfer_len) >= (offset + length)) {
102 spin_unlock_bh(&cmd->r2t_lock);
103 return r2t;
104 }
105 }
106 spin_unlock_bh(&cmd->r2t_lock);
107
108 pr_err("Unable to locate R2T for Offset: %u, Length:"
109 " %u\n", offset, length);
110 return NULL;
111 }
112
113 struct iscsi_r2t *iscsit_get_r2t_from_list(struct iscsi_cmd *cmd)
114 {
115 struct iscsi_r2t *r2t;
116
117 spin_lock_bh(&cmd->r2t_lock);
118 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
119 if (!r2t->sent_r2t) {
120 spin_unlock_bh(&cmd->r2t_lock);
121 return r2t;
122 }
123 }
124 spin_unlock_bh(&cmd->r2t_lock);
125
126 pr_err("Unable to locate next R2T to send for ITT:"
127 " 0x%08x.\n", cmd->init_task_tag);
128 return NULL;
129 }
130
131 /*
132 * Called with cmd->r2t_lock held.
133 */
134 void iscsit_free_r2t(struct iscsi_r2t *r2t, struct iscsi_cmd *cmd)
135 {
136 list_del(&r2t->r2t_list);
137 kmem_cache_free(lio_r2t_cache, r2t);
138 }
139
140 void iscsit_free_r2ts_from_list(struct iscsi_cmd *cmd)
141 {
142 struct iscsi_r2t *r2t, *r2t_tmp;
143
144 spin_lock_bh(&cmd->r2t_lock);
145 list_for_each_entry_safe(r2t, r2t_tmp, &cmd->cmd_r2t_list, r2t_list)
146 iscsit_free_r2t(r2t, cmd);
147 spin_unlock_bh(&cmd->r2t_lock);
148 }
149
150 /*
151 * May be called from software interrupt (timer) context for allocating
152 * iSCSI NopINs.
153 */
154 struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *conn, int state)
155 {
156 struct iscsi_cmd *cmd;
157 struct se_session *se_sess = conn->sess->se_sess;
158 int size, tag;
159
160 tag = percpu_ida_alloc(&se_sess->sess_tag_pool, state);
161 if (tag < 0)
162 return NULL;
163
164 size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;
165 cmd = (struct iscsi_cmd *)(se_sess->sess_cmd_map + (tag * size));
166 memset(cmd, 0, size);
167
168 cmd->se_cmd.map_tag = tag;
169 cmd->conn = conn;
170 cmd->data_direction = DMA_NONE;
171 INIT_LIST_HEAD(&cmd->i_conn_node);
172 INIT_LIST_HEAD(&cmd->datain_list);
173 INIT_LIST_HEAD(&cmd->cmd_r2t_list);
174 spin_lock_init(&cmd->datain_lock);
175 spin_lock_init(&cmd->dataout_timeout_lock);
176 spin_lock_init(&cmd->istate_lock);
177 spin_lock_init(&cmd->error_lock);
178 spin_lock_init(&cmd->r2t_lock);
179 timer_setup(&cmd->dataout_timer, iscsit_handle_dataout_timeout, 0);
180
181 return cmd;
182 }
183 EXPORT_SYMBOL(iscsit_allocate_cmd);
184
185 struct iscsi_seq *iscsit_get_seq_holder_for_datain(
186 struct iscsi_cmd *cmd,
187 u32 seq_send_order)
188 {
189 u32 i;
190
191 for (i = 0; i < cmd->seq_count; i++)
192 if (cmd->seq_list[i].seq_send_order == seq_send_order)
193 return &cmd->seq_list[i];
194
195 return NULL;
196 }
197
198 struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsi_cmd *cmd)
199 {
200 u32 i;
201
202 if (!cmd->seq_list) {
203 pr_err("struct iscsi_cmd->seq_list is NULL!\n");
204 return NULL;
205 }
206
207 for (i = 0; i < cmd->seq_count; i++) {
208 if (cmd->seq_list[i].type != SEQTYPE_NORMAL)
209 continue;
210 if (cmd->seq_list[i].seq_send_order == cmd->seq_send_order) {
211 cmd->seq_send_order++;
212 return &cmd->seq_list[i];
213 }
214 }
215
216 return NULL;
217 }
218
219 struct iscsi_r2t *iscsit_get_holder_for_r2tsn(
220 struct iscsi_cmd *cmd,
221 u32 r2t_sn)
222 {
223 struct iscsi_r2t *r2t;
224
225 spin_lock_bh(&cmd->r2t_lock);
226 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
227 if (r2t->r2t_sn == r2t_sn) {
228 spin_unlock_bh(&cmd->r2t_lock);
229 return r2t;
230 }
231 }
232 spin_unlock_bh(&cmd->r2t_lock);
233
234 return NULL;
235 }
236
237 static inline int iscsit_check_received_cmdsn(struct iscsi_session *sess, u32 cmdsn)
238 {
239 u32 max_cmdsn;
240 int ret;
241
242 /*
243 * This is the proper method of checking received CmdSN against
244 * ExpCmdSN and MaxCmdSN values, as well as accounting for out
245 * or order CmdSNs due to multiple connection sessions and/or
246 * CRC failures.
247 */
248 max_cmdsn = atomic_read(&sess->max_cmd_sn);
249 if (iscsi_sna_gt(cmdsn, max_cmdsn)) {
250 pr_err("Received CmdSN: 0x%08x is greater than"
251 " MaxCmdSN: 0x%08x, ignoring.\n", cmdsn, max_cmdsn);
252 ret = CMDSN_MAXCMDSN_OVERRUN;
253
254 } else if (cmdsn == sess->exp_cmd_sn) {
255 sess->exp_cmd_sn++;
256 pr_debug("Received CmdSN matches ExpCmdSN,"
257 " incremented ExpCmdSN to: 0x%08x\n",
258 sess->exp_cmd_sn);
259 ret = CMDSN_NORMAL_OPERATION;
260
261 } else if (iscsi_sna_gt(cmdsn, sess->exp_cmd_sn)) {
262 pr_debug("Received CmdSN: 0x%08x is greater"
263 " than ExpCmdSN: 0x%08x, not acknowledging.\n",
264 cmdsn, sess->exp_cmd_sn);
265 ret = CMDSN_HIGHER_THAN_EXP;
266
267 } else {
268 pr_err("Received CmdSN: 0x%08x is less than"
269 " ExpCmdSN: 0x%08x, ignoring.\n", cmdsn,
270 sess->exp_cmd_sn);
271 ret = CMDSN_LOWER_THAN_EXP;
272 }
273
274 return ret;
275 }
276
277 /*
278 * Commands may be received out of order if MC/S is in use.
279 * Ensure they are executed in CmdSN order.
280 */
281 int iscsit_sequence_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
282 unsigned char *buf, __be32 cmdsn)
283 {
284 int ret, cmdsn_ret;
285 bool reject = false;
286 u8 reason = ISCSI_REASON_BOOKMARK_NO_RESOURCES;
287
288 mutex_lock(&conn->sess->cmdsn_mutex);
289
290 cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, be32_to_cpu(cmdsn));
291 switch (cmdsn_ret) {
292 case CMDSN_NORMAL_OPERATION:
293 ret = iscsit_execute_cmd(cmd, 0);
294 if ((ret >= 0) && !list_empty(&conn->sess->sess_ooo_cmdsn_list))
295 iscsit_execute_ooo_cmdsns(conn->sess);
296 else if (ret < 0) {
297 reject = true;
298 ret = CMDSN_ERROR_CANNOT_RECOVER;
299 }
300 break;
301 case CMDSN_HIGHER_THAN_EXP:
302 ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, be32_to_cpu(cmdsn));
303 if (ret < 0) {
304 reject = true;
305 ret = CMDSN_ERROR_CANNOT_RECOVER;
306 break;
307 }
308 ret = CMDSN_HIGHER_THAN_EXP;
309 break;
310 case CMDSN_LOWER_THAN_EXP:
311 case CMDSN_MAXCMDSN_OVERRUN:
312 default:
313 cmd->i_state = ISTATE_REMOVE;
314 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
315 /*
316 * Existing callers for iscsit_sequence_cmd() will silently
317 * ignore commands with CMDSN_LOWER_THAN_EXP, so force this
318 * return for CMDSN_MAXCMDSN_OVERRUN as well..
319 */
320 ret = CMDSN_LOWER_THAN_EXP;
321 break;
322 }
323 mutex_unlock(&conn->sess->cmdsn_mutex);
324
325 if (reject)
326 iscsit_reject_cmd(cmd, reason, buf);
327
328 return ret;
329 }
330 EXPORT_SYMBOL(iscsit_sequence_cmd);
331
332 int iscsit_check_unsolicited_dataout(struct iscsi_cmd *cmd, unsigned char *buf)
333 {
334 struct iscsi_conn *conn = cmd->conn;
335 struct se_cmd *se_cmd = &cmd->se_cmd;
336 struct iscsi_data *hdr = (struct iscsi_data *) buf;
337 u32 payload_length = ntoh24(hdr->dlength);
338
339 if (conn->sess->sess_ops->InitialR2T) {
340 pr_err("Received unexpected unsolicited data"
341 " while InitialR2T=Yes, protocol error.\n");
342 transport_send_check_condition_and_sense(se_cmd,
343 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
344 return -1;
345 }
346
347 if ((cmd->first_burst_len + payload_length) >
348 conn->sess->sess_ops->FirstBurstLength) {
349 pr_err("Total %u bytes exceeds FirstBurstLength: %u"
350 " for this Unsolicited DataOut Burst.\n",
351 (cmd->first_burst_len + payload_length),
352 conn->sess->sess_ops->FirstBurstLength);
353 transport_send_check_condition_and_sense(se_cmd,
354 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
355 return -1;
356 }
357
358 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))
359 return 0;
360
361 if (((cmd->first_burst_len + payload_length) != cmd->se_cmd.data_length) &&
362 ((cmd->first_burst_len + payload_length) !=
363 conn->sess->sess_ops->FirstBurstLength)) {
364 pr_err("Unsolicited non-immediate data received %u"
365 " does not equal FirstBurstLength: %u, and does"
366 " not equal ExpXferLen %u.\n",
367 (cmd->first_burst_len + payload_length),
368 conn->sess->sess_ops->FirstBurstLength, cmd->se_cmd.data_length);
369 transport_send_check_condition_and_sense(se_cmd,
370 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
371 return -1;
372 }
373 return 0;
374 }
375
376 struct iscsi_cmd *iscsit_find_cmd_from_itt(
377 struct iscsi_conn *conn,
378 itt_t init_task_tag)
379 {
380 struct iscsi_cmd *cmd;
381
382 spin_lock_bh(&conn->cmd_lock);
383 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
384 if (cmd->init_task_tag == init_task_tag) {
385 spin_unlock_bh(&conn->cmd_lock);
386 return cmd;
387 }
388 }
389 spin_unlock_bh(&conn->cmd_lock);
390
391 pr_err("Unable to locate ITT: 0x%08x on CID: %hu",
392 init_task_tag, conn->cid);
393 return NULL;
394 }
395 EXPORT_SYMBOL(iscsit_find_cmd_from_itt);
396
397 struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump(
398 struct iscsi_conn *conn,
399 itt_t init_task_tag,
400 u32 length)
401 {
402 struct iscsi_cmd *cmd;
403
404 spin_lock_bh(&conn->cmd_lock);
405 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
406 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT)
407 continue;
408 if (cmd->init_task_tag == init_task_tag) {
409 spin_unlock_bh(&conn->cmd_lock);
410 return cmd;
411 }
412 }
413 spin_unlock_bh(&conn->cmd_lock);
414
415 pr_err("Unable to locate ITT: 0x%08x on CID: %hu,"
416 " dumping payload\n", init_task_tag, conn->cid);
417 if (length)
418 iscsit_dump_data_payload(conn, length, 1);
419
420 return NULL;
421 }
422 EXPORT_SYMBOL(iscsit_find_cmd_from_itt_or_dump);
423
424 struct iscsi_cmd *iscsit_find_cmd_from_ttt(
425 struct iscsi_conn *conn,
426 u32 targ_xfer_tag)
427 {
428 struct iscsi_cmd *cmd = NULL;
429
430 spin_lock_bh(&conn->cmd_lock);
431 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
432 if (cmd->targ_xfer_tag == targ_xfer_tag) {
433 spin_unlock_bh(&conn->cmd_lock);
434 return cmd;
435 }
436 }
437 spin_unlock_bh(&conn->cmd_lock);
438
439 pr_err("Unable to locate TTT: 0x%08x on CID: %hu\n",
440 targ_xfer_tag, conn->cid);
441 return NULL;
442 }
443
444 int iscsit_find_cmd_for_recovery(
445 struct iscsi_session *sess,
446 struct iscsi_cmd **cmd_ptr,
447 struct iscsi_conn_recovery **cr_ptr,
448 itt_t init_task_tag)
449 {
450 struct iscsi_cmd *cmd = NULL;
451 struct iscsi_conn_recovery *cr;
452 /*
453 * Scan through the inactive connection recovery list's command list.
454 * If init_task_tag matches the command is still alligent.
455 */
456 spin_lock(&sess->cr_i_lock);
457 list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) {
458 spin_lock(&cr->conn_recovery_cmd_lock);
459 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
460 if (cmd->init_task_tag == init_task_tag) {
461 spin_unlock(&cr->conn_recovery_cmd_lock);
462 spin_unlock(&sess->cr_i_lock);
463
464 *cr_ptr = cr;
465 *cmd_ptr = cmd;
466 return -2;
467 }
468 }
469 spin_unlock(&cr->conn_recovery_cmd_lock);
470 }
471 spin_unlock(&sess->cr_i_lock);
472 /*
473 * Scan through the active connection recovery list's command list.
474 * If init_task_tag matches the command is ready to be reassigned.
475 */
476 spin_lock(&sess->cr_a_lock);
477 list_for_each_entry(cr, &sess->cr_active_list, cr_list) {
478 spin_lock(&cr->conn_recovery_cmd_lock);
479 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
480 if (cmd->init_task_tag == init_task_tag) {
481 spin_unlock(&cr->conn_recovery_cmd_lock);
482 spin_unlock(&sess->cr_a_lock);
483
484 *cr_ptr = cr;
485 *cmd_ptr = cmd;
486 return 0;
487 }
488 }
489 spin_unlock(&cr->conn_recovery_cmd_lock);
490 }
491 spin_unlock(&sess->cr_a_lock);
492
493 return -1;
494 }
495
496 void iscsit_add_cmd_to_immediate_queue(
497 struct iscsi_cmd *cmd,
498 struct iscsi_conn *conn,
499 u8 state)
500 {
501 struct iscsi_queue_req *qr;
502
503 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
504 if (!qr) {
505 pr_err("Unable to allocate memory for"
506 " struct iscsi_queue_req\n");
507 return;
508 }
509 INIT_LIST_HEAD(&qr->qr_list);
510 qr->cmd = cmd;
511 qr->state = state;
512
513 spin_lock_bh(&conn->immed_queue_lock);
514 list_add_tail(&qr->qr_list, &conn->immed_queue_list);
515 atomic_inc(&cmd->immed_queue_count);
516 atomic_set(&conn->check_immediate_queue, 1);
517 spin_unlock_bh(&conn->immed_queue_lock);
518
519 wake_up(&conn->queues_wq);
520 }
521 EXPORT_SYMBOL(iscsit_add_cmd_to_immediate_queue);
522
523 struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *conn)
524 {
525 struct iscsi_queue_req *qr;
526
527 spin_lock_bh(&conn->immed_queue_lock);
528 if (list_empty(&conn->immed_queue_list)) {
529 spin_unlock_bh(&conn->immed_queue_lock);
530 return NULL;
531 }
532 qr = list_first_entry(&conn->immed_queue_list,
533 struct iscsi_queue_req, qr_list);
534
535 list_del(&qr->qr_list);
536 if (qr->cmd)
537 atomic_dec(&qr->cmd->immed_queue_count);
538 spin_unlock_bh(&conn->immed_queue_lock);
539
540 return qr;
541 }
542
543 static void iscsit_remove_cmd_from_immediate_queue(
544 struct iscsi_cmd *cmd,
545 struct iscsi_conn *conn)
546 {
547 struct iscsi_queue_req *qr, *qr_tmp;
548
549 spin_lock_bh(&conn->immed_queue_lock);
550 if (!atomic_read(&cmd->immed_queue_count)) {
551 spin_unlock_bh(&conn->immed_queue_lock);
552 return;
553 }
554
555 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
556 if (qr->cmd != cmd)
557 continue;
558
559 atomic_dec(&qr->cmd->immed_queue_count);
560 list_del(&qr->qr_list);
561 kmem_cache_free(lio_qr_cache, qr);
562 }
563 spin_unlock_bh(&conn->immed_queue_lock);
564
565 if (atomic_read(&cmd->immed_queue_count)) {
566 pr_err("ITT: 0x%08x immed_queue_count: %d\n",
567 cmd->init_task_tag,
568 atomic_read(&cmd->immed_queue_count));
569 }
570 }
571
572 int iscsit_add_cmd_to_response_queue(
573 struct iscsi_cmd *cmd,
574 struct iscsi_conn *conn,
575 u8 state)
576 {
577 struct iscsi_queue_req *qr;
578
579 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
580 if (!qr) {
581 pr_err("Unable to allocate memory for"
582 " struct iscsi_queue_req\n");
583 return -ENOMEM;
584 }
585 INIT_LIST_HEAD(&qr->qr_list);
586 qr->cmd = cmd;
587 qr->state = state;
588
589 spin_lock_bh(&conn->response_queue_lock);
590 list_add_tail(&qr->qr_list, &conn->response_queue_list);
591 atomic_inc(&cmd->response_queue_count);
592 spin_unlock_bh(&conn->response_queue_lock);
593
594 wake_up(&conn->queues_wq);
595 return 0;
596 }
597
598 struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *conn)
599 {
600 struct iscsi_queue_req *qr;
601
602 spin_lock_bh(&conn->response_queue_lock);
603 if (list_empty(&conn->response_queue_list)) {
604 spin_unlock_bh(&conn->response_queue_lock);
605 return NULL;
606 }
607
608 qr = list_first_entry(&conn->response_queue_list,
609 struct iscsi_queue_req, qr_list);
610
611 list_del(&qr->qr_list);
612 if (qr->cmd)
613 atomic_dec(&qr->cmd->response_queue_count);
614 spin_unlock_bh(&conn->response_queue_lock);
615
616 return qr;
617 }
618
619 static void iscsit_remove_cmd_from_response_queue(
620 struct iscsi_cmd *cmd,
621 struct iscsi_conn *conn)
622 {
623 struct iscsi_queue_req *qr, *qr_tmp;
624
625 spin_lock_bh(&conn->response_queue_lock);
626 if (!atomic_read(&cmd->response_queue_count)) {
627 spin_unlock_bh(&conn->response_queue_lock);
628 return;
629 }
630
631 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
632 qr_list) {
633 if (qr->cmd != cmd)
634 continue;
635
636 atomic_dec(&qr->cmd->response_queue_count);
637 list_del(&qr->qr_list);
638 kmem_cache_free(lio_qr_cache, qr);
639 }
640 spin_unlock_bh(&conn->response_queue_lock);
641
642 if (atomic_read(&cmd->response_queue_count)) {
643 pr_err("ITT: 0x%08x response_queue_count: %d\n",
644 cmd->init_task_tag,
645 atomic_read(&cmd->response_queue_count));
646 }
647 }
648
649 bool iscsit_conn_all_queues_empty(struct iscsi_conn *conn)
650 {
651 bool empty;
652
653 spin_lock_bh(&conn->immed_queue_lock);
654 empty = list_empty(&conn->immed_queue_list);
655 spin_unlock_bh(&conn->immed_queue_lock);
656
657 if (!empty)
658 return empty;
659
660 spin_lock_bh(&conn->response_queue_lock);
661 empty = list_empty(&conn->response_queue_list);
662 spin_unlock_bh(&conn->response_queue_lock);
663
664 return empty;
665 }
666
667 void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn)
668 {
669 struct iscsi_queue_req *qr, *qr_tmp;
670
671 spin_lock_bh(&conn->immed_queue_lock);
672 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
673 list_del(&qr->qr_list);
674 if (qr->cmd)
675 atomic_dec(&qr->cmd->immed_queue_count);
676
677 kmem_cache_free(lio_qr_cache, qr);
678 }
679 spin_unlock_bh(&conn->immed_queue_lock);
680
681 spin_lock_bh(&conn->response_queue_lock);
682 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
683 qr_list) {
684 list_del(&qr->qr_list);
685 if (qr->cmd)
686 atomic_dec(&qr->cmd->response_queue_count);
687
688 kmem_cache_free(lio_qr_cache, qr);
689 }
690 spin_unlock_bh(&conn->response_queue_lock);
691 }
692
693 void iscsit_release_cmd(struct iscsi_cmd *cmd)
694 {
695 struct iscsi_session *sess;
696 struct se_cmd *se_cmd = &cmd->se_cmd;
697
698 WARN_ON(!list_empty(&cmd->i_conn_node));
699
700 if (cmd->conn)
701 sess = cmd->conn->sess;
702 else
703 sess = cmd->sess;
704
705 BUG_ON(!sess || !sess->se_sess);
706
707 kfree(cmd->buf_ptr);
708 kfree(cmd->pdu_list);
709 kfree(cmd->seq_list);
710 kfree(cmd->tmr_req);
711 kfree(cmd->iov_data);
712 kfree(cmd->text_in_ptr);
713
714 percpu_ida_free(&sess->se_sess->sess_tag_pool, se_cmd->map_tag);
715 }
716 EXPORT_SYMBOL(iscsit_release_cmd);
717
718 void __iscsit_free_cmd(struct iscsi_cmd *cmd, bool check_queues)
719 {
720 struct iscsi_conn *conn = cmd->conn;
721
722 WARN_ON(!list_empty(&cmd->i_conn_node));
723
724 if (cmd->data_direction == DMA_TO_DEVICE) {
725 iscsit_stop_dataout_timer(cmd);
726 iscsit_free_r2ts_from_list(cmd);
727 }
728 if (cmd->data_direction == DMA_FROM_DEVICE)
729 iscsit_free_all_datain_reqs(cmd);
730
731 if (conn && check_queues) {
732 iscsit_remove_cmd_from_immediate_queue(cmd, conn);
733 iscsit_remove_cmd_from_response_queue(cmd, conn);
734 }
735
736 if (conn && conn->conn_transport->iscsit_release_cmd)
737 conn->conn_transport->iscsit_release_cmd(conn, cmd);
738 }
739
740 void iscsit_free_cmd(struct iscsi_cmd *cmd, bool shutdown)
741 {
742 struct se_cmd *se_cmd = cmd->se_cmd.se_tfo ? &cmd->se_cmd : NULL;
743 int rc;
744
745 __iscsit_free_cmd(cmd, shutdown);
746 if (se_cmd) {
747 rc = transport_generic_free_cmd(se_cmd, shutdown);
748 if (!rc && shutdown && se_cmd->se_sess) {
749 __iscsit_free_cmd(cmd, shutdown);
750 target_put_sess_cmd(se_cmd);
751 }
752 } else {
753 iscsit_release_cmd(cmd);
754 }
755 }
756 EXPORT_SYMBOL(iscsit_free_cmd);
757
758 int iscsit_check_session_usage_count(struct iscsi_session *sess)
759 {
760 spin_lock_bh(&sess->session_usage_lock);
761 if (sess->session_usage_count != 0) {
762 sess->session_waiting_on_uc = 1;
763 spin_unlock_bh(&sess->session_usage_lock);
764 if (in_interrupt())
765 return 2;
766
767 wait_for_completion(&sess->session_waiting_on_uc_comp);
768 return 1;
769 }
770 spin_unlock_bh(&sess->session_usage_lock);
771
772 return 0;
773 }
774
775 void iscsit_dec_session_usage_count(struct iscsi_session *sess)
776 {
777 spin_lock_bh(&sess->session_usage_lock);
778 sess->session_usage_count--;
779
780 if (!sess->session_usage_count && sess->session_waiting_on_uc)
781 complete(&sess->session_waiting_on_uc_comp);
782
783 spin_unlock_bh(&sess->session_usage_lock);
784 }
785
786 void iscsit_inc_session_usage_count(struct iscsi_session *sess)
787 {
788 spin_lock_bh(&sess->session_usage_lock);
789 sess->session_usage_count++;
790 spin_unlock_bh(&sess->session_usage_lock);
791 }
792
793 struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid)
794 {
795 struct iscsi_conn *conn;
796
797 spin_lock_bh(&sess->conn_lock);
798 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
799 if ((conn->cid == cid) &&
800 (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) {
801 iscsit_inc_conn_usage_count(conn);
802 spin_unlock_bh(&sess->conn_lock);
803 return conn;
804 }
805 }
806 spin_unlock_bh(&sess->conn_lock);
807
808 return NULL;
809 }
810
811 struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid)
812 {
813 struct iscsi_conn *conn;
814
815 spin_lock_bh(&sess->conn_lock);
816 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
817 if (conn->cid == cid) {
818 iscsit_inc_conn_usage_count(conn);
819 spin_lock(&conn->state_lock);
820 atomic_set(&conn->connection_wait_rcfr, 1);
821 spin_unlock(&conn->state_lock);
822 spin_unlock_bh(&sess->conn_lock);
823 return conn;
824 }
825 }
826 spin_unlock_bh(&sess->conn_lock);
827
828 return NULL;
829 }
830
831 void iscsit_check_conn_usage_count(struct iscsi_conn *conn)
832 {
833 spin_lock_bh(&conn->conn_usage_lock);
834 if (conn->conn_usage_count != 0) {
835 conn->conn_waiting_on_uc = 1;
836 spin_unlock_bh(&conn->conn_usage_lock);
837
838 wait_for_completion(&conn->conn_waiting_on_uc_comp);
839 return;
840 }
841 spin_unlock_bh(&conn->conn_usage_lock);
842 }
843
844 void iscsit_dec_conn_usage_count(struct iscsi_conn *conn)
845 {
846 spin_lock_bh(&conn->conn_usage_lock);
847 conn->conn_usage_count--;
848
849 if (!conn->conn_usage_count && conn->conn_waiting_on_uc)
850 complete(&conn->conn_waiting_on_uc_comp);
851
852 spin_unlock_bh(&conn->conn_usage_lock);
853 }
854
855 void iscsit_inc_conn_usage_count(struct iscsi_conn *conn)
856 {
857 spin_lock_bh(&conn->conn_usage_lock);
858 conn->conn_usage_count++;
859 spin_unlock_bh(&conn->conn_usage_lock);
860 }
861
862 static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response)
863 {
864 u8 state;
865 struct iscsi_cmd *cmd;
866
867 cmd = iscsit_allocate_cmd(conn, TASK_RUNNING);
868 if (!cmd)
869 return -1;
870
871 cmd->iscsi_opcode = ISCSI_OP_NOOP_IN;
872 state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE :
873 ISTATE_SEND_NOPIN_NO_RESPONSE;
874 cmd->init_task_tag = RESERVED_ITT;
875 cmd->targ_xfer_tag = (want_response) ?
876 session_get_next_ttt(conn->sess) : 0xFFFFFFFF;
877 spin_lock_bh(&conn->cmd_lock);
878 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
879 spin_unlock_bh(&conn->cmd_lock);
880
881 if (want_response)
882 iscsit_start_nopin_response_timer(conn);
883 iscsit_add_cmd_to_immediate_queue(cmd, conn, state);
884
885 return 0;
886 }
887
888 void iscsit_handle_nopin_response_timeout(struct timer_list *t)
889 {
890 struct iscsi_conn *conn = from_timer(conn, t, nopin_response_timer);
891
892 iscsit_inc_conn_usage_count(conn);
893
894 spin_lock_bh(&conn->nopin_timer_lock);
895 if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) {
896 spin_unlock_bh(&conn->nopin_timer_lock);
897 iscsit_dec_conn_usage_count(conn);
898 return;
899 }
900
901 pr_debug("Did not receive response to NOPIN on CID: %hu on"
902 " SID: %u, failing connection.\n", conn->cid,
903 conn->sess->sid);
904 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
905 spin_unlock_bh(&conn->nopin_timer_lock);
906
907 {
908 struct iscsi_portal_group *tpg = conn->sess->tpg;
909 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
910
911 if (tiqn) {
912 spin_lock_bh(&tiqn->sess_err_stats.lock);
913 strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
914 conn->sess->sess_ops->InitiatorName);
915 tiqn->sess_err_stats.last_sess_failure_type =
916 ISCSI_SESS_ERR_CXN_TIMEOUT;
917 tiqn->sess_err_stats.cxn_timeout_errors++;
918 atomic_long_inc(&conn->sess->conn_timeout_errors);
919 spin_unlock_bh(&tiqn->sess_err_stats.lock);
920 }
921 }
922
923 iscsit_cause_connection_reinstatement(conn, 0);
924 iscsit_dec_conn_usage_count(conn);
925 }
926
927 void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn)
928 {
929 struct iscsi_session *sess = conn->sess;
930 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
931
932 spin_lock_bh(&conn->nopin_timer_lock);
933 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
934 spin_unlock_bh(&conn->nopin_timer_lock);
935 return;
936 }
937
938 mod_timer(&conn->nopin_response_timer,
939 (get_jiffies_64() + na->nopin_response_timeout * HZ));
940 spin_unlock_bh(&conn->nopin_timer_lock);
941 }
942
943 /*
944 * Called with conn->nopin_timer_lock held.
945 */
946 void iscsit_start_nopin_response_timer(struct iscsi_conn *conn)
947 {
948 struct iscsi_session *sess = conn->sess;
949 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
950
951 spin_lock_bh(&conn->nopin_timer_lock);
952 if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) {
953 spin_unlock_bh(&conn->nopin_timer_lock);
954 return;
955 }
956
957 conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP;
958 conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING;
959 mod_timer(&conn->nopin_response_timer,
960 jiffies + na->nopin_response_timeout * HZ);
961
962 pr_debug("Started NOPIN Response Timer on CID: %d to %u"
963 " seconds\n", conn->cid, na->nopin_response_timeout);
964 spin_unlock_bh(&conn->nopin_timer_lock);
965 }
966
967 void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn)
968 {
969 spin_lock_bh(&conn->nopin_timer_lock);
970 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
971 spin_unlock_bh(&conn->nopin_timer_lock);
972 return;
973 }
974 conn->nopin_response_timer_flags |= ISCSI_TF_STOP;
975 spin_unlock_bh(&conn->nopin_timer_lock);
976
977 del_timer_sync(&conn->nopin_response_timer);
978
979 spin_lock_bh(&conn->nopin_timer_lock);
980 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
981 spin_unlock_bh(&conn->nopin_timer_lock);
982 }
983
984 void iscsit_handle_nopin_timeout(struct timer_list *t)
985 {
986 struct iscsi_conn *conn = from_timer(conn, t, nopin_timer);
987
988 iscsit_inc_conn_usage_count(conn);
989
990 spin_lock_bh(&conn->nopin_timer_lock);
991 if (conn->nopin_timer_flags & ISCSI_TF_STOP) {
992 spin_unlock_bh(&conn->nopin_timer_lock);
993 iscsit_dec_conn_usage_count(conn);
994 return;
995 }
996 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
997 spin_unlock_bh(&conn->nopin_timer_lock);
998
999 iscsit_add_nopin(conn, 1);
1000 iscsit_dec_conn_usage_count(conn);
1001 }
1002
1003 /*
1004 * Called with conn->nopin_timer_lock held.
1005 */
1006 void __iscsit_start_nopin_timer(struct iscsi_conn *conn)
1007 {
1008 struct iscsi_session *sess = conn->sess;
1009 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1010 /*
1011 * NOPIN timeout is disabled.
1012 */
1013 if (!na->nopin_timeout)
1014 return;
1015
1016 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING)
1017 return;
1018
1019 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1020 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1021 mod_timer(&conn->nopin_timer, jiffies + na->nopin_timeout * HZ);
1022
1023 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1024 " interval\n", conn->cid, na->nopin_timeout);
1025 }
1026
1027 void iscsit_start_nopin_timer(struct iscsi_conn *conn)
1028 {
1029 struct iscsi_session *sess = conn->sess;
1030 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1031 /*
1032 * NOPIN timeout is disabled..
1033 */
1034 if (!na->nopin_timeout)
1035 return;
1036
1037 spin_lock_bh(&conn->nopin_timer_lock);
1038 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) {
1039 spin_unlock_bh(&conn->nopin_timer_lock);
1040 return;
1041 }
1042
1043 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1044 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1045 mod_timer(&conn->nopin_timer, jiffies + na->nopin_timeout * HZ);
1046
1047 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1048 " interval\n", conn->cid, na->nopin_timeout);
1049 spin_unlock_bh(&conn->nopin_timer_lock);
1050 }
1051
1052 void iscsit_stop_nopin_timer(struct iscsi_conn *conn)
1053 {
1054 spin_lock_bh(&conn->nopin_timer_lock);
1055 if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) {
1056 spin_unlock_bh(&conn->nopin_timer_lock);
1057 return;
1058 }
1059 conn->nopin_timer_flags |= ISCSI_TF_STOP;
1060 spin_unlock_bh(&conn->nopin_timer_lock);
1061
1062 del_timer_sync(&conn->nopin_timer);
1063
1064 spin_lock_bh(&conn->nopin_timer_lock);
1065 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1066 spin_unlock_bh(&conn->nopin_timer_lock);
1067 }
1068
1069 int iscsit_send_tx_data(
1070 struct iscsi_cmd *cmd,
1071 struct iscsi_conn *conn,
1072 int use_misc)
1073 {
1074 int tx_sent, tx_size;
1075 u32 iov_count;
1076 struct kvec *iov;
1077
1078 send_data:
1079 tx_size = cmd->tx_size;
1080
1081 if (!use_misc) {
1082 iov = &cmd->iov_data[0];
1083 iov_count = cmd->iov_data_count;
1084 } else {
1085 iov = &cmd->iov_misc[0];
1086 iov_count = cmd->iov_misc_count;
1087 }
1088
1089 tx_sent = tx_data(conn, &iov[0], iov_count, tx_size);
1090 if (tx_size != tx_sent) {
1091 if (tx_sent == -EAGAIN) {
1092 pr_err("tx_data() returned -EAGAIN\n");
1093 goto send_data;
1094 } else
1095 return -1;
1096 }
1097 cmd->tx_size = 0;
1098
1099 return 0;
1100 }
1101
1102 int iscsit_fe_sendpage_sg(
1103 struct iscsi_cmd *cmd,
1104 struct iscsi_conn *conn)
1105 {
1106 struct scatterlist *sg = cmd->first_data_sg;
1107 struct kvec iov;
1108 u32 tx_hdr_size, data_len;
1109 u32 offset = cmd->first_data_sg_off;
1110 int tx_sent, iov_off;
1111
1112 send_hdr:
1113 tx_hdr_size = ISCSI_HDR_LEN;
1114 if (conn->conn_ops->HeaderDigest)
1115 tx_hdr_size += ISCSI_CRC_LEN;
1116
1117 iov.iov_base = cmd->pdu;
1118 iov.iov_len = tx_hdr_size;
1119
1120 tx_sent = tx_data(conn, &iov, 1, tx_hdr_size);
1121 if (tx_hdr_size != tx_sent) {
1122 if (tx_sent == -EAGAIN) {
1123 pr_err("tx_data() returned -EAGAIN\n");
1124 goto send_hdr;
1125 }
1126 return -1;
1127 }
1128
1129 data_len = cmd->tx_size - tx_hdr_size - cmd->padding;
1130 /*
1131 * Set iov_off used by padding and data digest tx_data() calls below
1132 * in order to determine proper offset into cmd->iov_data[]
1133 */
1134 if (conn->conn_ops->DataDigest) {
1135 data_len -= ISCSI_CRC_LEN;
1136 if (cmd->padding)
1137 iov_off = (cmd->iov_data_count - 2);
1138 else
1139 iov_off = (cmd->iov_data_count - 1);
1140 } else {
1141 iov_off = (cmd->iov_data_count - 1);
1142 }
1143 /*
1144 * Perform sendpage() for each page in the scatterlist
1145 */
1146 while (data_len) {
1147 u32 space = (sg->length - offset);
1148 u32 sub_len = min_t(u32, data_len, space);
1149 send_pg:
1150 tx_sent = conn->sock->ops->sendpage(conn->sock,
1151 sg_page(sg), sg->offset + offset, sub_len, 0);
1152 if (tx_sent != sub_len) {
1153 if (tx_sent == -EAGAIN) {
1154 pr_err("tcp_sendpage() returned"
1155 " -EAGAIN\n");
1156 goto send_pg;
1157 }
1158
1159 pr_err("tcp_sendpage() failure: %d\n",
1160 tx_sent);
1161 return -1;
1162 }
1163
1164 data_len -= sub_len;
1165 offset = 0;
1166 sg = sg_next(sg);
1167 }
1168
1169 send_padding:
1170 if (cmd->padding) {
1171 struct kvec *iov_p = &cmd->iov_data[iov_off++];
1172
1173 tx_sent = tx_data(conn, iov_p, 1, cmd->padding);
1174 if (cmd->padding != tx_sent) {
1175 if (tx_sent == -EAGAIN) {
1176 pr_err("tx_data() returned -EAGAIN\n");
1177 goto send_padding;
1178 }
1179 return -1;
1180 }
1181 }
1182
1183 send_datacrc:
1184 if (conn->conn_ops->DataDigest) {
1185 struct kvec *iov_d = &cmd->iov_data[iov_off];
1186
1187 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN);
1188 if (ISCSI_CRC_LEN != tx_sent) {
1189 if (tx_sent == -EAGAIN) {
1190 pr_err("tx_data() returned -EAGAIN\n");
1191 goto send_datacrc;
1192 }
1193 return -1;
1194 }
1195 }
1196
1197 return 0;
1198 }
1199
1200 /*
1201 * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU
1202 * back to the Initiator when an expection condition occurs with the
1203 * errors set in status_class and status_detail.
1204 *
1205 * Parameters: iSCSI Connection, Status Class, Status Detail.
1206 * Returns: 0 on success, -1 on error.
1207 */
1208 int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail)
1209 {
1210 struct iscsi_login_rsp *hdr;
1211 struct iscsi_login *login = conn->conn_login;
1212
1213 login->login_failed = 1;
1214 iscsit_collect_login_stats(conn, status_class, status_detail);
1215
1216 memset(&login->rsp[0], 0, ISCSI_HDR_LEN);
1217
1218 hdr = (struct iscsi_login_rsp *)&login->rsp[0];
1219 hdr->opcode = ISCSI_OP_LOGIN_RSP;
1220 hdr->status_class = status_class;
1221 hdr->status_detail = status_detail;
1222 hdr->itt = conn->login_itt;
1223
1224 return conn->conn_transport->iscsit_put_login_tx(conn, login, 0);
1225 }
1226
1227 void iscsit_print_session_params(struct iscsi_session *sess)
1228 {
1229 struct iscsi_conn *conn;
1230
1231 pr_debug("-----------------------------[Session Params for"
1232 " SID: %u]-----------------------------\n", sess->sid);
1233 spin_lock_bh(&sess->conn_lock);
1234 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
1235 iscsi_dump_conn_ops(conn->conn_ops);
1236 spin_unlock_bh(&sess->conn_lock);
1237
1238 iscsi_dump_sess_ops(sess->sess_ops);
1239 }
1240
1241 static int iscsit_do_rx_data(
1242 struct iscsi_conn *conn,
1243 struct iscsi_data_count *count)
1244 {
1245 int data = count->data_length, rx_loop = 0, total_rx = 0;
1246 struct msghdr msg;
1247
1248 if (!conn || !conn->sock || !conn->conn_ops)
1249 return -1;
1250
1251 memset(&msg, 0, sizeof(struct msghdr));
1252 iov_iter_kvec(&msg.msg_iter, READ | ITER_KVEC,
1253 count->iov, count->iov_count, data);
1254
1255 while (msg_data_left(&msg)) {
1256 rx_loop = sock_recvmsg(conn->sock, &msg, MSG_WAITALL);
1257 if (rx_loop <= 0) {
1258 pr_debug("rx_loop: %d total_rx: %d\n",
1259 rx_loop, total_rx);
1260 return rx_loop;
1261 }
1262 total_rx += rx_loop;
1263 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n",
1264 rx_loop, total_rx, data);
1265 }
1266
1267 return total_rx;
1268 }
1269
1270 int rx_data(
1271 struct iscsi_conn *conn,
1272 struct kvec *iov,
1273 int iov_count,
1274 int data)
1275 {
1276 struct iscsi_data_count c;
1277
1278 if (!conn || !conn->sock || !conn->conn_ops)
1279 return -1;
1280
1281 memset(&c, 0, sizeof(struct iscsi_data_count));
1282 c.iov = iov;
1283 c.iov_count = iov_count;
1284 c.data_length = data;
1285 c.type = ISCSI_RX_DATA;
1286
1287 return iscsit_do_rx_data(conn, &c);
1288 }
1289
1290 int tx_data(
1291 struct iscsi_conn *conn,
1292 struct kvec *iov,
1293 int iov_count,
1294 int data)
1295 {
1296 struct msghdr msg;
1297 int total_tx = 0;
1298
1299 if (!conn || !conn->sock || !conn->conn_ops)
1300 return -1;
1301
1302 if (data <= 0) {
1303 pr_err("Data length is: %d\n", data);
1304 return -1;
1305 }
1306
1307 memset(&msg, 0, sizeof(struct msghdr));
1308
1309 iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC,
1310 iov, iov_count, data);
1311
1312 while (msg_data_left(&msg)) {
1313 int tx_loop = sock_sendmsg(conn->sock, &msg);
1314 if (tx_loop <= 0) {
1315 pr_debug("tx_loop: %d total_tx %d\n",
1316 tx_loop, total_tx);
1317 return tx_loop;
1318 }
1319 total_tx += tx_loop;
1320 pr_debug("tx_loop: %d, total_tx: %d, data: %d\n",
1321 tx_loop, total_tx, data);
1322 }
1323
1324 return total_tx;
1325 }
1326
1327 void iscsit_collect_login_stats(
1328 struct iscsi_conn *conn,
1329 u8 status_class,
1330 u8 status_detail)
1331 {
1332 struct iscsi_param *intrname = NULL;
1333 struct iscsi_tiqn *tiqn;
1334 struct iscsi_login_stats *ls;
1335
1336 tiqn = iscsit_snmp_get_tiqn(conn);
1337 if (!tiqn)
1338 return;
1339
1340 ls = &tiqn->login_stats;
1341
1342 spin_lock(&ls->lock);
1343 if (status_class == ISCSI_STATUS_CLS_SUCCESS)
1344 ls->accepts++;
1345 else if (status_class == ISCSI_STATUS_CLS_REDIRECT) {
1346 ls->redirects++;
1347 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT;
1348 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1349 (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) {
1350 ls->authenticate_fails++;
1351 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE;
1352 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1353 (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) {
1354 ls->authorize_fails++;
1355 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE;
1356 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1357 (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) {
1358 ls->negotiate_fails++;
1359 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE;
1360 } else {
1361 ls->other_fails++;
1362 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER;
1363 }
1364
1365 /* Save initiator name, ip address and time, if it is a failed login */
1366 if (status_class != ISCSI_STATUS_CLS_SUCCESS) {
1367 if (conn->param_list)
1368 intrname = iscsi_find_param_from_key(INITIATORNAME,
1369 conn->param_list);
1370 strlcpy(ls->last_intr_fail_name,
1371 (intrname ? intrname->value : "Unknown"),
1372 sizeof(ls->last_intr_fail_name));
1373
1374 ls->last_intr_fail_ip_family = conn->login_family;
1375
1376 ls->last_intr_fail_sockaddr = conn->login_sockaddr;
1377 ls->last_fail_time = get_jiffies_64();
1378 }
1379
1380 spin_unlock(&ls->lock);
1381 }
1382
1383 struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn)
1384 {
1385 struct iscsi_portal_group *tpg;
1386
1387 if (!conn)
1388 return NULL;
1389
1390 tpg = conn->tpg;
1391 if (!tpg)
1392 return NULL;
1393
1394 if (!tpg->tpg_tiqn)
1395 return NULL;
1396
1397 return tpg->tpg_tiqn;
1398 }
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