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