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Merge branch 'r6040-next'
[linux/fpc-iii.git] / drivers / target / iscsi / iscsi_target_util.c
blob1f38177207e0806b18641766fdd6849ae1555a9b
1 /*******************************************************************************
2 * This file contains the iSCSI Target specific utility functions.
3 *
4 * (c) Copyright 2007-2013 Datera, Inc.
5 *
6 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 ******************************************************************************/
18
19 #include <linux/list.h>
20 #include <linux/percpu_ida.h>
21 #include <scsi/scsi_tcq.h>
22 #include <scsi/iscsi_proto.h>
23 #include <target/target_core_base.h>
24 #include <target/target_core_fabric.h>
25 #include <target/iscsi/iscsi_transport.h>
26
27 #include <target/iscsi/iscsi_target_core.h>
28 #include "iscsi_target_parameters.h"
29 #include "iscsi_target_seq_pdu_list.h"
30 #include "iscsi_target_datain_values.h"
31 #include "iscsi_target_erl0.h"
32 #include "iscsi_target_erl1.h"
33 #include "iscsi_target_erl2.h"
34 #include "iscsi_target_tpg.h"
35 #include "iscsi_target_util.h"
36 #include "iscsi_target.h"
37
38 #define PRINT_BUFF(buff, len) \
39 { \
40 int zzz; \
41 \
42 pr_debug("%d:\n", __LINE__); \
43 for (zzz = 0; zzz < len; zzz++) { \
44 if (zzz % 16 == 0) { \
45 if (zzz) \
46 pr_debug("\n"); \
47 pr_debug("%4i: ", zzz); \
48 } \
49 pr_debug("%02x ", (unsigned char) (buff)[zzz]); \
50 } \
51 if ((len + 1) % 16) \
52 pr_debug("\n"); \
53 }
54
55 extern struct list_head g_tiqn_list;
56 extern spinlock_t tiqn_lock;
57
58 /*
59 * Called with cmd->r2t_lock held.
60 */
61 int iscsit_add_r2t_to_list(
62 struct iscsi_cmd *cmd,
63 u32 offset,
64 u32 xfer_len,
65 int recovery,
66 u32 r2t_sn)
67 {
68 struct iscsi_r2t *r2t;
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 /*
131 * Called with cmd->r2t_lock held.
132 */
133 void iscsit_free_r2t(struct iscsi_r2t *r2t, struct iscsi_cmd *cmd)
134 {
135 list_del(&r2t->r2t_list);
136 kmem_cache_free(lio_r2t_cache, r2t);
137 }
138
139 void iscsit_free_r2ts_from_list(struct iscsi_cmd *cmd)
140 {
141 struct iscsi_r2t *r2t, *r2t_tmp;
142
143 spin_lock_bh(&cmd->r2t_lock);
144 list_for_each_entry_safe(r2t, r2t_tmp, &cmd->cmd_r2t_list, r2t_list)
145 iscsit_free_r2t(r2t, cmd);
146 spin_unlock_bh(&cmd->r2t_lock);
147 }
148
149 /*
150 * May be called from software interrupt (timer) context for allocating
151 * iSCSI NopINs.
152 */
153 struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *conn, int state)
154 {
155 struct iscsi_cmd *cmd;
156 struct se_session *se_sess = conn->sess->se_sess;
157 int size, tag;
158
159 tag = percpu_ida_alloc(&se_sess->sess_tag_pool, state);
160 if (tag < 0)
161 return NULL;
162
163 size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;
164 cmd = (struct iscsi_cmd *)(se_sess->sess_cmd_map + (tag * size));
165 memset(cmd, 0, size);
166
167 cmd->se_cmd.map_tag = tag;
168 cmd->conn = conn;
169 INIT_LIST_HEAD(&cmd->i_conn_node);
170 INIT_LIST_HEAD(&cmd->datain_list);
171 INIT_LIST_HEAD(&cmd->cmd_r2t_list);
172 spin_lock_init(&cmd->datain_lock);
173 spin_lock_init(&cmd->dataout_timeout_lock);
174 spin_lock_init(&cmd->istate_lock);
175 spin_lock_init(&cmd->error_lock);
176 spin_lock_init(&cmd->r2t_lock);
177
178 return cmd;
179 }
180 EXPORT_SYMBOL(iscsit_allocate_cmd);
181
182 struct iscsi_seq *iscsit_get_seq_holder_for_datain(
183 struct iscsi_cmd *cmd,
184 u32 seq_send_order)
185 {
186 u32 i;
187
188 for (i = 0; i < cmd->seq_count; i++)
189 if (cmd->seq_list[i].seq_send_order == seq_send_order)
190 return &cmd->seq_list[i];
191
192 return NULL;
193 }
194
195 struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsi_cmd *cmd)
196 {
197 u32 i;
198
199 if (!cmd->seq_list) {
200 pr_err("struct iscsi_cmd->seq_list is NULL!\n");
201 return NULL;
202 }
203
204 for (i = 0; i < cmd->seq_count; i++) {
205 if (cmd->seq_list[i].type != SEQTYPE_NORMAL)
206 continue;
207 if (cmd->seq_list[i].seq_send_order == cmd->seq_send_order) {
208 cmd->seq_send_order++;
209 return &cmd->seq_list[i];
210 }
211 }
212
213 return NULL;
214 }
215
216 struct iscsi_r2t *iscsit_get_holder_for_r2tsn(
217 struct iscsi_cmd *cmd,
218 u32 r2t_sn)
219 {
220 struct iscsi_r2t *r2t;
221
222 spin_lock_bh(&cmd->r2t_lock);
223 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
224 if (r2t->r2t_sn == r2t_sn) {
225 spin_unlock_bh(&cmd->r2t_lock);
226 return r2t;
227 }
228 }
229 spin_unlock_bh(&cmd->r2t_lock);
230
231 return NULL;
232 }
233
234 static inline int iscsit_check_received_cmdsn(struct iscsi_session *sess, u32 cmdsn)
235 {
236 u32 max_cmdsn;
237 int ret;
238
239 /*
240 * This is the proper method of checking received CmdSN against
241 * ExpCmdSN and MaxCmdSN values, as well as accounting for out
242 * or order CmdSNs due to multiple connection sessions and/or
243 * CRC failures.
244 */
245 max_cmdsn = atomic_read(&sess->max_cmd_sn);
246 if (iscsi_sna_gt(cmdsn, max_cmdsn)) {
247 pr_err("Received CmdSN: 0x%08x is greater than"
248 " MaxCmdSN: 0x%08x, ignoring.\n", cmdsn, max_cmdsn);
249 ret = CMDSN_MAXCMDSN_OVERRUN;
250
251 } else if (cmdsn == sess->exp_cmd_sn) {
252 sess->exp_cmd_sn++;
253 pr_debug("Received CmdSN matches ExpCmdSN,"
254 " incremented ExpCmdSN to: 0x%08x\n",
255 sess->exp_cmd_sn);
256 ret = CMDSN_NORMAL_OPERATION;
257
258 } else if (iscsi_sna_gt(cmdsn, sess->exp_cmd_sn)) {
259 pr_debug("Received CmdSN: 0x%08x is greater"
260 " than ExpCmdSN: 0x%08x, not acknowledging.\n",
261 cmdsn, sess->exp_cmd_sn);
262 ret = CMDSN_HIGHER_THAN_EXP;
263
264 } else {
265 pr_err("Received CmdSN: 0x%08x is less than"
266 " ExpCmdSN: 0x%08x, ignoring.\n", cmdsn,
267 sess->exp_cmd_sn);
268 ret = CMDSN_LOWER_THAN_EXP;
269 }
270
271 return ret;
272 }
273
274 /*
275 * Commands may be received out of order if MC/S is in use.
276 * Ensure they are executed in CmdSN order.
277 */
278 int iscsit_sequence_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
279 unsigned char *buf, __be32 cmdsn)
280 {
281 int ret, cmdsn_ret;
282 bool reject = false;
283 u8 reason = ISCSI_REASON_BOOKMARK_NO_RESOURCES;
284
285 mutex_lock(&conn->sess->cmdsn_mutex);
286
287 cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, be32_to_cpu(cmdsn));
288 switch (cmdsn_ret) {
289 case CMDSN_NORMAL_OPERATION:
290 ret = iscsit_execute_cmd(cmd, 0);
291 if ((ret >= 0) && !list_empty(&conn->sess->sess_ooo_cmdsn_list))
292 iscsit_execute_ooo_cmdsns(conn->sess);
293 else if (ret < 0) {
294 reject = true;
295 ret = CMDSN_ERROR_CANNOT_RECOVER;
296 }
297 break;
298 case CMDSN_HIGHER_THAN_EXP:
299 ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, be32_to_cpu(cmdsn));
300 if (ret < 0) {
301 reject = true;
302 ret = CMDSN_ERROR_CANNOT_RECOVER;
303 break;
304 }
305 ret = CMDSN_HIGHER_THAN_EXP;
306 break;
307 case CMDSN_LOWER_THAN_EXP:
308 case CMDSN_MAXCMDSN_OVERRUN:
309 default:
310 cmd->i_state = ISTATE_REMOVE;
311 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
312 /*
313 * Existing callers for iscsit_sequence_cmd() will silently
314 * ignore commands with CMDSN_LOWER_THAN_EXP, so force this
315 * return for CMDSN_MAXCMDSN_OVERRUN as well..
316 */
317 ret = CMDSN_LOWER_THAN_EXP;
318 break;
319 }
320 mutex_unlock(&conn->sess->cmdsn_mutex);
321
322 if (reject)
323 iscsit_reject_cmd(cmd, reason, buf);
324
325 return ret;
326 }
327 EXPORT_SYMBOL(iscsit_sequence_cmd);
328
329 int iscsit_check_unsolicited_dataout(struct iscsi_cmd *cmd, unsigned char *buf)
330 {
331 struct iscsi_conn *conn = cmd->conn;
332 struct se_cmd *se_cmd = &cmd->se_cmd;
333 struct iscsi_data *hdr = (struct iscsi_data *) buf;
334 u32 payload_length = ntoh24(hdr->dlength);
335
336 if (conn->sess->sess_ops->InitialR2T) {
337 pr_err("Received unexpected unsolicited data"
338 " while InitialR2T=Yes, protocol error.\n");
339 transport_send_check_condition_and_sense(se_cmd,
340 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
341 return -1;
342 }
343
344 if ((cmd->first_burst_len + payload_length) >
345 conn->sess->sess_ops->FirstBurstLength) {
346 pr_err("Total %u bytes exceeds FirstBurstLength: %u"
347 " for this Unsolicited DataOut Burst.\n",
348 (cmd->first_burst_len + payload_length),
349 conn->sess->sess_ops->FirstBurstLength);
350 transport_send_check_condition_and_sense(se_cmd,
351 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
352 return -1;
353 }
354
355 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))
356 return 0;
357
358 if (((cmd->first_burst_len + payload_length) != cmd->se_cmd.data_length) &&
359 ((cmd->first_burst_len + payload_length) !=
360 conn->sess->sess_ops->FirstBurstLength)) {
361 pr_err("Unsolicited non-immediate data received %u"
362 " does not equal FirstBurstLength: %u, and does"
363 " not equal ExpXferLen %u.\n",
364 (cmd->first_burst_len + payload_length),
365 conn->sess->sess_ops->FirstBurstLength, cmd->se_cmd.data_length);
366 transport_send_check_condition_and_sense(se_cmd,
367 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
368 return -1;
369 }
370 return 0;
371 }
372
373 struct iscsi_cmd *iscsit_find_cmd_from_itt(
374 struct iscsi_conn *conn,
375 itt_t init_task_tag)
376 {
377 struct iscsi_cmd *cmd;
378
379 spin_lock_bh(&conn->cmd_lock);
380 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
381 if (cmd->init_task_tag == init_task_tag) {
382 spin_unlock_bh(&conn->cmd_lock);
383 return cmd;
384 }
385 }
386 spin_unlock_bh(&conn->cmd_lock);
387
388 pr_err("Unable to locate ITT: 0x%08x on CID: %hu",
389 init_task_tag, conn->cid);
390 return NULL;
391 }
392 EXPORT_SYMBOL(iscsit_find_cmd_from_itt);
393
394 struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump(
395 struct iscsi_conn *conn,
396 itt_t init_task_tag,
397 u32 length)
398 {
399 struct iscsi_cmd *cmd;
400
401 spin_lock_bh(&conn->cmd_lock);
402 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
403 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT)
404 continue;
405 if (cmd->init_task_tag == init_task_tag) {
406 spin_unlock_bh(&conn->cmd_lock);
407 return cmd;
408 }
409 }
410 spin_unlock_bh(&conn->cmd_lock);
411
412 pr_err("Unable to locate ITT: 0x%08x on CID: %hu,"
413 " dumping payload\n", init_task_tag, conn->cid);
414 if (length)
415 iscsit_dump_data_payload(conn, length, 1);
416
417 return NULL;
418 }
419
420 struct iscsi_cmd *iscsit_find_cmd_from_ttt(
421 struct iscsi_conn *conn,
422 u32 targ_xfer_tag)
423 {
424 struct iscsi_cmd *cmd = NULL;
425
426 spin_lock_bh(&conn->cmd_lock);
427 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
428 if (cmd->targ_xfer_tag == targ_xfer_tag) {
429 spin_unlock_bh(&conn->cmd_lock);
430 return cmd;
431 }
432 }
433 spin_unlock_bh(&conn->cmd_lock);
434
435 pr_err("Unable to locate TTT: 0x%08x on CID: %hu\n",
436 targ_xfer_tag, conn->cid);
437 return NULL;
438 }
439
440 int iscsit_find_cmd_for_recovery(
441 struct iscsi_session *sess,
442 struct iscsi_cmd **cmd_ptr,
443 struct iscsi_conn_recovery **cr_ptr,
444 itt_t init_task_tag)
445 {
446 struct iscsi_cmd *cmd = NULL;
447 struct iscsi_conn_recovery *cr;
448 /*
449 * Scan through the inactive connection recovery list's command list.
450 * If init_task_tag matches the command is still alligent.
451 */
452 spin_lock(&sess->cr_i_lock);
453 list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) {
454 spin_lock(&cr->conn_recovery_cmd_lock);
455 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
456 if (cmd->init_task_tag == init_task_tag) {
457 spin_unlock(&cr->conn_recovery_cmd_lock);
458 spin_unlock(&sess->cr_i_lock);
459
460 *cr_ptr = cr;
461 *cmd_ptr = cmd;
462 return -2;
463 }
464 }
465 spin_unlock(&cr->conn_recovery_cmd_lock);
466 }
467 spin_unlock(&sess->cr_i_lock);
468 /*
469 * Scan through the active connection recovery list's command list.
470 * If init_task_tag matches the command is ready to be reassigned.
471 */
472 spin_lock(&sess->cr_a_lock);
473 list_for_each_entry(cr, &sess->cr_active_list, cr_list) {
474 spin_lock(&cr->conn_recovery_cmd_lock);
475 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
476 if (cmd->init_task_tag == init_task_tag) {
477 spin_unlock(&cr->conn_recovery_cmd_lock);
478 spin_unlock(&sess->cr_a_lock);
479
480 *cr_ptr = cr;
481 *cmd_ptr = cmd;
482 return 0;
483 }
484 }
485 spin_unlock(&cr->conn_recovery_cmd_lock);
486 }
487 spin_unlock(&sess->cr_a_lock);
488
489 return -1;
490 }
491
492 void iscsit_add_cmd_to_immediate_queue(
493 struct iscsi_cmd *cmd,
494 struct iscsi_conn *conn,
495 u8 state)
496 {
497 struct iscsi_queue_req *qr;
498
499 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
500 if (!qr) {
501 pr_err("Unable to allocate memory for"
502 " struct iscsi_queue_req\n");
503 return;
504 }
505 INIT_LIST_HEAD(&qr->qr_list);
506 qr->cmd = cmd;
507 qr->state = state;
508
509 spin_lock_bh(&conn->immed_queue_lock);
510 list_add_tail(&qr->qr_list, &conn->immed_queue_list);
511 atomic_inc(&cmd->immed_queue_count);
512 atomic_set(&conn->check_immediate_queue, 1);
513 spin_unlock_bh(&conn->immed_queue_lock);
514
515 wake_up(&conn->queues_wq);
516 }
517 EXPORT_SYMBOL(iscsit_add_cmd_to_immediate_queue);
518
519 struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *conn)
520 {
521 struct iscsi_queue_req *qr;
522
523 spin_lock_bh(&conn->immed_queue_lock);
524 if (list_empty(&conn->immed_queue_list)) {
525 spin_unlock_bh(&conn->immed_queue_lock);
526 return NULL;
527 }
528 qr = list_first_entry(&conn->immed_queue_list,
529 struct iscsi_queue_req, qr_list);
530
531 list_del(&qr->qr_list);
532 if (qr->cmd)
533 atomic_dec(&qr->cmd->immed_queue_count);
534 spin_unlock_bh(&conn->immed_queue_lock);
535
536 return qr;
537 }
538
539 static void iscsit_remove_cmd_from_immediate_queue(
540 struct iscsi_cmd *cmd,
541 struct iscsi_conn *conn)
542 {
543 struct iscsi_queue_req *qr, *qr_tmp;
544
545 spin_lock_bh(&conn->immed_queue_lock);
546 if (!atomic_read(&cmd->immed_queue_count)) {
547 spin_unlock_bh(&conn->immed_queue_lock);
548 return;
549 }
550
551 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
552 if (qr->cmd != cmd)
553 continue;
554
555 atomic_dec(&qr->cmd->immed_queue_count);
556 list_del(&qr->qr_list);
557 kmem_cache_free(lio_qr_cache, qr);
558 }
559 spin_unlock_bh(&conn->immed_queue_lock);
560
561 if (atomic_read(&cmd->immed_queue_count)) {
562 pr_err("ITT: 0x%08x immed_queue_count: %d\n",
563 cmd->init_task_tag,
564 atomic_read(&cmd->immed_queue_count));
565 }
566 }
567
568 void iscsit_add_cmd_to_response_queue(
569 struct iscsi_cmd *cmd,
570 struct iscsi_conn *conn,
571 u8 state)
572 {
573 struct iscsi_queue_req *qr;
574
575 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
576 if (!qr) {
577 pr_err("Unable to allocate memory for"
578 " struct iscsi_queue_req\n");
579 return;
580 }
581 INIT_LIST_HEAD(&qr->qr_list);
582 qr->cmd = cmd;
583 qr->state = state;
584
585 spin_lock_bh(&conn->response_queue_lock);
586 list_add_tail(&qr->qr_list, &conn->response_queue_list);
587 atomic_inc(&cmd->response_queue_count);
588 spin_unlock_bh(&conn->response_queue_lock);
589
590 wake_up(&conn->queues_wq);
591 }
592
593 struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *conn)
594 {
595 struct iscsi_queue_req *qr;
596
597 spin_lock_bh(&conn->response_queue_lock);
598 if (list_empty(&conn->response_queue_list)) {
599 spin_unlock_bh(&conn->response_queue_lock);
600 return NULL;
601 }
602
603 qr = list_first_entry(&conn->response_queue_list,
604 struct iscsi_queue_req, qr_list);
605
606 list_del(&qr->qr_list);
607 if (qr->cmd)
608 atomic_dec(&qr->cmd->response_queue_count);
609 spin_unlock_bh(&conn->response_queue_lock);
610
611 return qr;
612 }
613
614 static void iscsit_remove_cmd_from_response_queue(
615 struct iscsi_cmd *cmd,
616 struct iscsi_conn *conn)
617 {
618 struct iscsi_queue_req *qr, *qr_tmp;
619
620 spin_lock_bh(&conn->response_queue_lock);
621 if (!atomic_read(&cmd->response_queue_count)) {
622 spin_unlock_bh(&conn->response_queue_lock);
623 return;
624 }
625
626 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
627 qr_list) {
628 if (qr->cmd != cmd)
629 continue;
630
631 atomic_dec(&qr->cmd->response_queue_count);
632 list_del(&qr->qr_list);
633 kmem_cache_free(lio_qr_cache, qr);
634 }
635 spin_unlock_bh(&conn->response_queue_lock);
636
637 if (atomic_read(&cmd->response_queue_count)) {
638 pr_err("ITT: 0x%08x response_queue_count: %d\n",
639 cmd->init_task_tag,
640 atomic_read(&cmd->response_queue_count));
641 }
642 }
643
644 bool iscsit_conn_all_queues_empty(struct iscsi_conn *conn)
645 {
646 bool empty;
647
648 spin_lock_bh(&conn->immed_queue_lock);
649 empty = list_empty(&conn->immed_queue_list);
650 spin_unlock_bh(&conn->immed_queue_lock);
651
652 if (!empty)
653 return empty;
654
655 spin_lock_bh(&conn->response_queue_lock);
656 empty = list_empty(&conn->response_queue_list);
657 spin_unlock_bh(&conn->response_queue_lock);
658
659 return empty;
660 }
661
662 void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn)
663 {
664 struct iscsi_queue_req *qr, *qr_tmp;
665
666 spin_lock_bh(&conn->immed_queue_lock);
667 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
668 list_del(&qr->qr_list);
669 if (qr->cmd)
670 atomic_dec(&qr->cmd->immed_queue_count);
671
672 kmem_cache_free(lio_qr_cache, qr);
673 }
674 spin_unlock_bh(&conn->immed_queue_lock);
675
676 spin_lock_bh(&conn->response_queue_lock);
677 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
678 qr_list) {
679 list_del(&qr->qr_list);
680 if (qr->cmd)
681 atomic_dec(&qr->cmd->response_queue_count);
682
683 kmem_cache_free(lio_qr_cache, qr);
684 }
685 spin_unlock_bh(&conn->response_queue_lock);
686 }
687
688 void iscsit_release_cmd(struct iscsi_cmd *cmd)
689 {
690 struct iscsi_session *sess;
691 struct se_cmd *se_cmd = &cmd->se_cmd;
692
693 if (cmd->conn)
694 sess = cmd->conn->sess;
695 else
696 sess = cmd->sess;
697
698 BUG_ON(!sess || !sess->se_sess);
699
700 kfree(cmd->buf_ptr);
701 kfree(cmd->pdu_list);
702 kfree(cmd->seq_list);
703 kfree(cmd->tmr_req);
704 kfree(cmd->iov_data);
705 kfree(cmd->text_in_ptr);
706
707 percpu_ida_free(&sess->se_sess->sess_tag_pool, se_cmd->map_tag);
708 }
709 EXPORT_SYMBOL(iscsit_release_cmd);
710
711 void __iscsit_free_cmd(struct iscsi_cmd *cmd, bool scsi_cmd,
712 bool check_queues)
713 {
714 struct iscsi_conn *conn = cmd->conn;
715
716 if (scsi_cmd) {
717 if (cmd->data_direction == DMA_TO_DEVICE) {
718 iscsit_stop_dataout_timer(cmd);
719 iscsit_free_r2ts_from_list(cmd);
720 }
721 if (cmd->data_direction == DMA_FROM_DEVICE)
722 iscsit_free_all_datain_reqs(cmd);
723 }
724
725 if (conn && check_queues) {
726 iscsit_remove_cmd_from_immediate_queue(cmd, conn);
727 iscsit_remove_cmd_from_response_queue(cmd, conn);
728 }
729
730 if (conn && conn->conn_transport->iscsit_release_cmd)
731 conn->conn_transport->iscsit_release_cmd(conn, cmd);
732 }
733
734 void iscsit_free_cmd(struct iscsi_cmd *cmd, bool shutdown)
735 {
736 struct se_cmd *se_cmd = NULL;
737 int rc;
738 /*
739 * Determine if a struct se_cmd is associated with
740 * this struct iscsi_cmd.
741 */
742 switch (cmd->iscsi_opcode) {
743 case ISCSI_OP_SCSI_CMD:
744 se_cmd = &cmd->se_cmd;
745 __iscsit_free_cmd(cmd, true, shutdown);
746 /*
747 * Fallthrough
748 */
749 case ISCSI_OP_SCSI_TMFUNC:
750 rc = transport_generic_free_cmd(&cmd->se_cmd, shutdown);
751 if (!rc && shutdown && se_cmd && se_cmd->se_sess) {
752 __iscsit_free_cmd(cmd, true, shutdown);
753 target_put_sess_cmd(se_cmd);
754 }
755 break;
756 case ISCSI_OP_REJECT:
757 /*
758 * Handle special case for REJECT when iscsi_add_reject*() has
759 * overwritten the original iscsi_opcode assignment, and the
760 * associated cmd->se_cmd needs to be released.
761 */
762 if (cmd->se_cmd.se_tfo != NULL) {
763 se_cmd = &cmd->se_cmd;
764 __iscsit_free_cmd(cmd, true, shutdown);
765
766 rc = transport_generic_free_cmd(&cmd->se_cmd, shutdown);
767 if (!rc && shutdown && se_cmd->se_sess) {
768 __iscsit_free_cmd(cmd, true, shutdown);
769 target_put_sess_cmd(se_cmd);
770 }
771 break;
772 }
773 /* Fall-through */
774 default:
775 __iscsit_free_cmd(cmd, false, shutdown);
776 iscsit_release_cmd(cmd);
777 break;
778 }
779 }
780 EXPORT_SYMBOL(iscsit_free_cmd);
781
782 int iscsit_check_session_usage_count(struct iscsi_session *sess)
783 {
784 spin_lock_bh(&sess->session_usage_lock);
785 if (sess->session_usage_count != 0) {
786 sess->session_waiting_on_uc = 1;
787 spin_unlock_bh(&sess->session_usage_lock);
788 if (in_interrupt())
789 return 2;
790
791 wait_for_completion(&sess->session_waiting_on_uc_comp);
792 return 1;
793 }
794 spin_unlock_bh(&sess->session_usage_lock);
795
796 return 0;
797 }
798
799 void iscsit_dec_session_usage_count(struct iscsi_session *sess)
800 {
801 spin_lock_bh(&sess->session_usage_lock);
802 sess->session_usage_count--;
803
804 if (!sess->session_usage_count && sess->session_waiting_on_uc)
805 complete(&sess->session_waiting_on_uc_comp);
806
807 spin_unlock_bh(&sess->session_usage_lock);
808 }
809
810 void iscsit_inc_session_usage_count(struct iscsi_session *sess)
811 {
812 spin_lock_bh(&sess->session_usage_lock);
813 sess->session_usage_count++;
814 spin_unlock_bh(&sess->session_usage_lock);
815 }
816
817 struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid)
818 {
819 struct iscsi_conn *conn;
820
821 spin_lock_bh(&sess->conn_lock);
822 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
823 if ((conn->cid == cid) &&
824 (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) {
825 iscsit_inc_conn_usage_count(conn);
826 spin_unlock_bh(&sess->conn_lock);
827 return conn;
828 }
829 }
830 spin_unlock_bh(&sess->conn_lock);
831
832 return NULL;
833 }
834
835 struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid)
836 {
837 struct iscsi_conn *conn;
838
839 spin_lock_bh(&sess->conn_lock);
840 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
841 if (conn->cid == cid) {
842 iscsit_inc_conn_usage_count(conn);
843 spin_lock(&conn->state_lock);
844 atomic_set(&conn->connection_wait_rcfr, 1);
845 spin_unlock(&conn->state_lock);
846 spin_unlock_bh(&sess->conn_lock);
847 return conn;
848 }
849 }
850 spin_unlock_bh(&sess->conn_lock);
851
852 return NULL;
853 }
854
855 void iscsit_check_conn_usage_count(struct iscsi_conn *conn)
856 {
857 spin_lock_bh(&conn->conn_usage_lock);
858 if (conn->conn_usage_count != 0) {
859 conn->conn_waiting_on_uc = 1;
860 spin_unlock_bh(&conn->conn_usage_lock);
861
862 wait_for_completion(&conn->conn_waiting_on_uc_comp);
863 return;
864 }
865 spin_unlock_bh(&conn->conn_usage_lock);
866 }
867
868 void iscsit_dec_conn_usage_count(struct iscsi_conn *conn)
869 {
870 spin_lock_bh(&conn->conn_usage_lock);
871 conn->conn_usage_count--;
872
873 if (!conn->conn_usage_count && conn->conn_waiting_on_uc)
874 complete(&conn->conn_waiting_on_uc_comp);
875
876 spin_unlock_bh(&conn->conn_usage_lock);
877 }
878
879 void iscsit_inc_conn_usage_count(struct iscsi_conn *conn)
880 {
881 spin_lock_bh(&conn->conn_usage_lock);
882 conn->conn_usage_count++;
883 spin_unlock_bh(&conn->conn_usage_lock);
884 }
885
886 static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response)
887 {
888 u8 state;
889 struct iscsi_cmd *cmd;
890
891 cmd = iscsit_allocate_cmd(conn, TASK_RUNNING);
892 if (!cmd)
893 return -1;
894
895 cmd->iscsi_opcode = ISCSI_OP_NOOP_IN;
896 state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE :
897 ISTATE_SEND_NOPIN_NO_RESPONSE;
898 cmd->init_task_tag = RESERVED_ITT;
899 cmd->targ_xfer_tag = (want_response) ?
900 session_get_next_ttt(conn->sess) : 0xFFFFFFFF;
901 spin_lock_bh(&conn->cmd_lock);
902 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
903 spin_unlock_bh(&conn->cmd_lock);
904
905 if (want_response)
906 iscsit_start_nopin_response_timer(conn);
907 iscsit_add_cmd_to_immediate_queue(cmd, conn, state);
908
909 return 0;
910 }
911
912 static void iscsit_handle_nopin_response_timeout(unsigned long data)
913 {
914 struct iscsi_conn *conn = (struct iscsi_conn *) data;
915
916 iscsit_inc_conn_usage_count(conn);
917
918 spin_lock_bh(&conn->nopin_timer_lock);
919 if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) {
920 spin_unlock_bh(&conn->nopin_timer_lock);
921 iscsit_dec_conn_usage_count(conn);
922 return;
923 }
924
925 pr_debug("Did not receive response to NOPIN on CID: %hu on"
926 " SID: %u, failing connection.\n", conn->cid,
927 conn->sess->sid);
928 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
929 spin_unlock_bh(&conn->nopin_timer_lock);
930
931 {
932 struct iscsi_portal_group *tpg = conn->sess->tpg;
933 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
934
935 if (tiqn) {
936 spin_lock_bh(&tiqn->sess_err_stats.lock);
937 strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
938 conn->sess->sess_ops->InitiatorName);
939 tiqn->sess_err_stats.last_sess_failure_type =
940 ISCSI_SESS_ERR_CXN_TIMEOUT;
941 tiqn->sess_err_stats.cxn_timeout_errors++;
942 atomic_long_inc(&conn->sess->conn_timeout_errors);
943 spin_unlock_bh(&tiqn->sess_err_stats.lock);
944 }
945 }
946
947 iscsit_cause_connection_reinstatement(conn, 0);
948 iscsit_dec_conn_usage_count(conn);
949 }
950
951 void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn)
952 {
953 struct iscsi_session *sess = conn->sess;
954 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
955
956 spin_lock_bh(&conn->nopin_timer_lock);
957 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
958 spin_unlock_bh(&conn->nopin_timer_lock);
959 return;
960 }
961
962 mod_timer(&conn->nopin_response_timer,
963 (get_jiffies_64() + na->nopin_response_timeout * HZ));
964 spin_unlock_bh(&conn->nopin_timer_lock);
965 }
966
967 /*
968 * Called with conn->nopin_timer_lock held.
969 */
970 void iscsit_start_nopin_response_timer(struct iscsi_conn *conn)
971 {
972 struct iscsi_session *sess = conn->sess;
973 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
974
975 spin_lock_bh(&conn->nopin_timer_lock);
976 if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) {
977 spin_unlock_bh(&conn->nopin_timer_lock);
978 return;
979 }
980
981 init_timer(&conn->nopin_response_timer);
982 conn->nopin_response_timer.expires =
983 (get_jiffies_64() + na->nopin_response_timeout * HZ);
984 conn->nopin_response_timer.data = (unsigned long)conn;
985 conn->nopin_response_timer.function = iscsit_handle_nopin_response_timeout;
986 conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP;
987 conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING;
988 add_timer(&conn->nopin_response_timer);
989
990 pr_debug("Started NOPIN Response Timer on CID: %d to %u"
991 " seconds\n", conn->cid, na->nopin_response_timeout);
992 spin_unlock_bh(&conn->nopin_timer_lock);
993 }
994
995 void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn)
996 {
997 spin_lock_bh(&conn->nopin_timer_lock);
998 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
999 spin_unlock_bh(&conn->nopin_timer_lock);
1000 return;
1001 }
1002 conn->nopin_response_timer_flags |= ISCSI_TF_STOP;
1003 spin_unlock_bh(&conn->nopin_timer_lock);
1004
1005 del_timer_sync(&conn->nopin_response_timer);
1006
1007 spin_lock_bh(&conn->nopin_timer_lock);
1008 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
1009 spin_unlock_bh(&conn->nopin_timer_lock);
1010 }
1011
1012 static void iscsit_handle_nopin_timeout(unsigned long data)
1013 {
1014 struct iscsi_conn *conn = (struct iscsi_conn *) data;
1015
1016 iscsit_inc_conn_usage_count(conn);
1017
1018 spin_lock_bh(&conn->nopin_timer_lock);
1019 if (conn->nopin_timer_flags & ISCSI_TF_STOP) {
1020 spin_unlock_bh(&conn->nopin_timer_lock);
1021 iscsit_dec_conn_usage_count(conn);
1022 return;
1023 }
1024 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1025 spin_unlock_bh(&conn->nopin_timer_lock);
1026
1027 iscsit_add_nopin(conn, 1);
1028 iscsit_dec_conn_usage_count(conn);
1029 }
1030
1031 /*
1032 * Called with conn->nopin_timer_lock held.
1033 */
1034 void __iscsit_start_nopin_timer(struct iscsi_conn *conn)
1035 {
1036 struct iscsi_session *sess = conn->sess;
1037 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1038 /*
1039 * NOPIN timeout is disabled.
1040 */
1041 if (!na->nopin_timeout)
1042 return;
1043
1044 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING)
1045 return;
1046
1047 init_timer(&conn->nopin_timer);
1048 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1049 conn->nopin_timer.data = (unsigned long)conn;
1050 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1051 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1052 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1053 add_timer(&conn->nopin_timer);
1054
1055 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1056 " interval\n", conn->cid, na->nopin_timeout);
1057 }
1058
1059 void iscsit_start_nopin_timer(struct iscsi_conn *conn)
1060 {
1061 struct iscsi_session *sess = conn->sess;
1062 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1063 /*
1064 * NOPIN timeout is disabled..
1065 */
1066 if (!na->nopin_timeout)
1067 return;
1068
1069 spin_lock_bh(&conn->nopin_timer_lock);
1070 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) {
1071 spin_unlock_bh(&conn->nopin_timer_lock);
1072 return;
1073 }
1074
1075 init_timer(&conn->nopin_timer);
1076 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1077 conn->nopin_timer.data = (unsigned long)conn;
1078 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1079 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1080 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1081 add_timer(&conn->nopin_timer);
1082
1083 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1084 " interval\n", conn->cid, na->nopin_timeout);
1085 spin_unlock_bh(&conn->nopin_timer_lock);
1086 }
1087
1088 void iscsit_stop_nopin_timer(struct iscsi_conn *conn)
1089 {
1090 spin_lock_bh(&conn->nopin_timer_lock);
1091 if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) {
1092 spin_unlock_bh(&conn->nopin_timer_lock);
1093 return;
1094 }
1095 conn->nopin_timer_flags |= ISCSI_TF_STOP;
1096 spin_unlock_bh(&conn->nopin_timer_lock);
1097
1098 del_timer_sync(&conn->nopin_timer);
1099
1100 spin_lock_bh(&conn->nopin_timer_lock);
1101 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1102 spin_unlock_bh(&conn->nopin_timer_lock);
1103 }
1104
1105 int iscsit_send_tx_data(
1106 struct iscsi_cmd *cmd,
1107 struct iscsi_conn *conn,
1108 int use_misc)
1109 {
1110 int tx_sent, tx_size;
1111 u32 iov_count;
1112 struct kvec *iov;
1113
1114 send_data:
1115 tx_size = cmd->tx_size;
1116
1117 if (!use_misc) {
1118 iov = &cmd->iov_data[0];
1119 iov_count = cmd->iov_data_count;
1120 } else {
1121 iov = &cmd->iov_misc[0];
1122 iov_count = cmd->iov_misc_count;
1123 }
1124
1125 tx_sent = tx_data(conn, &iov[0], iov_count, tx_size);
1126 if (tx_size != tx_sent) {
1127 if (tx_sent == -EAGAIN) {
1128 pr_err("tx_data() returned -EAGAIN\n");
1129 goto send_data;
1130 } else
1131 return -1;
1132 }
1133 cmd->tx_size = 0;
1134
1135 return 0;
1136 }
1137
1138 int iscsit_fe_sendpage_sg(
1139 struct iscsi_cmd *cmd,
1140 struct iscsi_conn *conn)
1141 {
1142 struct scatterlist *sg = cmd->first_data_sg;
1143 struct kvec iov;
1144 u32 tx_hdr_size, data_len;
1145 u32 offset = cmd->first_data_sg_off;
1146 int tx_sent, iov_off;
1147
1148 send_hdr:
1149 tx_hdr_size = ISCSI_HDR_LEN;
1150 if (conn->conn_ops->HeaderDigest)
1151 tx_hdr_size += ISCSI_CRC_LEN;
1152
1153 iov.iov_base = cmd->pdu;
1154 iov.iov_len = tx_hdr_size;
1155
1156 tx_sent = tx_data(conn, &iov, 1, tx_hdr_size);
1157 if (tx_hdr_size != tx_sent) {
1158 if (tx_sent == -EAGAIN) {
1159 pr_err("tx_data() returned -EAGAIN\n");
1160 goto send_hdr;
1161 }
1162 return -1;
1163 }
1164
1165 data_len = cmd->tx_size - tx_hdr_size - cmd->padding;
1166 /*
1167 * Set iov_off used by padding and data digest tx_data() calls below
1168 * in order to determine proper offset into cmd->iov_data[]
1169 */
1170 if (conn->conn_ops->DataDigest) {
1171 data_len -= ISCSI_CRC_LEN;
1172 if (cmd->padding)
1173 iov_off = (cmd->iov_data_count - 2);
1174 else
1175 iov_off = (cmd->iov_data_count - 1);
1176 } else {
1177 iov_off = (cmd->iov_data_count - 1);
1178 }
1179 /*
1180 * Perform sendpage() for each page in the scatterlist
1181 */
1182 while (data_len) {
1183 u32 space = (sg->length - offset);
1184 u32 sub_len = min_t(u32, data_len, space);
1185 send_pg:
1186 tx_sent = conn->sock->ops->sendpage(conn->sock,
1187 sg_page(sg), sg->offset + offset, sub_len, 0);
1188 if (tx_sent != sub_len) {
1189 if (tx_sent == -EAGAIN) {
1190 pr_err("tcp_sendpage() returned"
1191 " -EAGAIN\n");
1192 goto send_pg;
1193 }
1194
1195 pr_err("tcp_sendpage() failure: %d\n",
1196 tx_sent);
1197 return -1;
1198 }
1199
1200 data_len -= sub_len;
1201 offset = 0;
1202 sg = sg_next(sg);
1203 }
1204
1205 send_padding:
1206 if (cmd->padding) {
1207 struct kvec *iov_p = &cmd->iov_data[iov_off++];
1208
1209 tx_sent = tx_data(conn, iov_p, 1, cmd->padding);
1210 if (cmd->padding != tx_sent) {
1211 if (tx_sent == -EAGAIN) {
1212 pr_err("tx_data() returned -EAGAIN\n");
1213 goto send_padding;
1214 }
1215 return -1;
1216 }
1217 }
1218
1219 send_datacrc:
1220 if (conn->conn_ops->DataDigest) {
1221 struct kvec *iov_d = &cmd->iov_data[iov_off];
1222
1223 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN);
1224 if (ISCSI_CRC_LEN != tx_sent) {
1225 if (tx_sent == -EAGAIN) {
1226 pr_err("tx_data() returned -EAGAIN\n");
1227 goto send_datacrc;
1228 }
1229 return -1;
1230 }
1231 }
1232
1233 return 0;
1234 }
1235
1236 /*
1237 * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU
1238 * back to the Initiator when an expection condition occurs with the
1239 * errors set in status_class and status_detail.
1240 *
1241 * Parameters: iSCSI Connection, Status Class, Status Detail.
1242 * Returns: 0 on success, -1 on error.
1243 */
1244 int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail)
1245 {
1246 struct iscsi_login_rsp *hdr;
1247 struct iscsi_login *login = conn->conn_login;
1248
1249 login->login_failed = 1;
1250 iscsit_collect_login_stats(conn, status_class, status_detail);
1251
1252 memset(&login->rsp[0], 0, ISCSI_HDR_LEN);
1253
1254 hdr = (struct iscsi_login_rsp *)&login->rsp[0];
1255 hdr->opcode = ISCSI_OP_LOGIN_RSP;
1256 hdr->status_class = status_class;
1257 hdr->status_detail = status_detail;
1258 hdr->itt = conn->login_itt;
1259
1260 return conn->conn_transport->iscsit_put_login_tx(conn, login, 0);
1261 }
1262
1263 void iscsit_print_session_params(struct iscsi_session *sess)
1264 {
1265 struct iscsi_conn *conn;
1266
1267 pr_debug("-----------------------------[Session Params for"
1268 " SID: %u]-----------------------------\n", sess->sid);
1269 spin_lock_bh(&sess->conn_lock);
1270 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
1271 iscsi_dump_conn_ops(conn->conn_ops);
1272 spin_unlock_bh(&sess->conn_lock);
1273
1274 iscsi_dump_sess_ops(sess->sess_ops);
1275 }
1276
1277 static int iscsit_do_rx_data(
1278 struct iscsi_conn *conn,
1279 struct iscsi_data_count *count)
1280 {
1281 int data = count->data_length, rx_loop = 0, total_rx = 0;
1282 struct msghdr msg;
1283
1284 if (!conn || !conn->sock || !conn->conn_ops)
1285 return -1;
1286
1287 memset(&msg, 0, sizeof(struct msghdr));
1288 iov_iter_kvec(&msg.msg_iter, READ | ITER_KVEC,
1289 count->iov, count->iov_count, data);
1290
1291 while (msg_data_left(&msg)) {
1292 rx_loop = sock_recvmsg(conn->sock, &msg, MSG_WAITALL);
1293 if (rx_loop <= 0) {
1294 pr_debug("rx_loop: %d total_rx: %d\n",
1295 rx_loop, total_rx);
1296 return rx_loop;
1297 }
1298 total_rx += rx_loop;
1299 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n",
1300 rx_loop, total_rx, data);
1301 }
1302
1303 return total_rx;
1304 }
1305
1306 static int iscsit_do_tx_data(
1307 struct iscsi_conn *conn,
1308 struct iscsi_data_count *count)
1309 {
1310 int ret, iov_len;
1311 struct kvec *iov_p;
1312 struct msghdr msg;
1313
1314 if (!conn || !conn->sock || !conn->conn_ops)
1315 return -1;
1316
1317 if (count->data_length <= 0) {
1318 pr_err("Data length is: %d\n", count->data_length);
1319 return -1;
1320 }
1321
1322 memset(&msg, 0, sizeof(struct msghdr));
1323
1324 iov_p = count->iov;
1325 iov_len = count->iov_count;
1326
1327 ret = kernel_sendmsg(conn->sock, &msg, iov_p, iov_len,
1328 count->data_length);
1329 if (ret != count->data_length) {
1330 pr_err("Unexpected ret: %d send data %d\n",
1331 ret, count->data_length);
1332 return -EPIPE;
1333 }
1334 pr_debug("ret: %d, sent data: %d\n", ret, count->data_length);
1335
1336 return ret;
1337 }
1338
1339 int rx_data(
1340 struct iscsi_conn *conn,
1341 struct kvec *iov,
1342 int iov_count,
1343 int data)
1344 {
1345 struct iscsi_data_count c;
1346
1347 if (!conn || !conn->sock || !conn->conn_ops)
1348 return -1;
1349
1350 memset(&c, 0, sizeof(struct iscsi_data_count));
1351 c.iov = iov;
1352 c.iov_count = iov_count;
1353 c.data_length = data;
1354 c.type = ISCSI_RX_DATA;
1355
1356 return iscsit_do_rx_data(conn, &c);
1357 }
1358
1359 int tx_data(
1360 struct iscsi_conn *conn,
1361 struct kvec *iov,
1362 int iov_count,
1363 int data)
1364 {
1365 struct iscsi_data_count c;
1366
1367 if (!conn || !conn->sock || !conn->conn_ops)
1368 return -1;
1369
1370 memset(&c, 0, sizeof(struct iscsi_data_count));
1371 c.iov = iov;
1372 c.iov_count = iov_count;
1373 c.data_length = data;
1374 c.type = ISCSI_TX_DATA;
1375
1376 return iscsit_do_tx_data(conn, &c);
1377 }
1378
1379 static bool sockaddr_equal(struct sockaddr_storage *x, struct sockaddr_storage *y)
1380 {
1381 switch (x->ss_family) {
1382 case AF_INET: {
1383 struct sockaddr_in *sinx = (struct sockaddr_in *)x;
1384 struct sockaddr_in *siny = (struct sockaddr_in *)y;
1385 if (sinx->sin_addr.s_addr != siny->sin_addr.s_addr)
1386 return false;
1387 if (sinx->sin_port != siny->sin_port)
1388 return false;
1389 break;
1390 }
1391 case AF_INET6: {
1392 struct sockaddr_in6 *sinx = (struct sockaddr_in6 *)x;
1393 struct sockaddr_in6 *siny = (struct sockaddr_in6 *)y;
1394 if (!ipv6_addr_equal(&sinx->sin6_addr, &siny->sin6_addr))
1395 return false;
1396 if (sinx->sin6_port != siny->sin6_port)
1397 return false;
1398 break;
1399 }
1400 default:
1401 return false;
1402 }
1403 return true;
1404 }
1405
1406 void iscsit_collect_login_stats(
1407 struct iscsi_conn *conn,
1408 u8 status_class,
1409 u8 status_detail)
1410 {
1411 struct iscsi_param *intrname = NULL;
1412 struct iscsi_tiqn *tiqn;
1413 struct iscsi_login_stats *ls;
1414
1415 tiqn = iscsit_snmp_get_tiqn(conn);
1416 if (!tiqn)
1417 return;
1418
1419 ls = &tiqn->login_stats;
1420
1421 spin_lock(&ls->lock);
1422 if (sockaddr_equal(&conn->login_sockaddr, &ls->last_intr_fail_sockaddr) &&
1423 ((get_jiffies_64() - ls->last_fail_time) < 10)) {
1424 /* We already have the failure info for this login */
1425 spin_unlock(&ls->lock);
1426 return;
1427 }
1428
1429 if (status_class == ISCSI_STATUS_CLS_SUCCESS)
1430 ls->accepts++;
1431 else if (status_class == ISCSI_STATUS_CLS_REDIRECT) {
1432 ls->redirects++;
1433 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT;
1434 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1435 (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) {
1436 ls->authenticate_fails++;
1437 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE;
1438 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1439 (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) {
1440 ls->authorize_fails++;
1441 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE;
1442 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1443 (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) {
1444 ls->negotiate_fails++;
1445 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE;
1446 } else {
1447 ls->other_fails++;
1448 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER;
1449 }
1450
1451 /* Save initiator name, ip address and time, if it is a failed login */
1452 if (status_class != ISCSI_STATUS_CLS_SUCCESS) {
1453 if (conn->param_list)
1454 intrname = iscsi_find_param_from_key(INITIATORNAME,
1455 conn->param_list);
1456 strlcpy(ls->last_intr_fail_name,
1457 (intrname ? intrname->value : "Unknown"),
1458 sizeof(ls->last_intr_fail_name));
1459
1460 ls->last_intr_fail_ip_family = conn->login_family;
1461
1462 ls->last_intr_fail_sockaddr = conn->login_sockaddr;
1463 ls->last_fail_time = get_jiffies_64();
1464 }
1465
1466 spin_unlock(&ls->lock);
1467 }
1468
1469 struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn)
1470 {
1471 struct iscsi_portal_group *tpg;
1472
1473 if (!conn || !conn->sess)
1474 return NULL;
1475
1476 tpg = conn->sess->tpg;
1477 if (!tpg)
1478 return NULL;
1479
1480 if (!tpg->tpg_tiqn)
1481 return NULL;
1482
1483 return tpg->tpg_tiqn;
1484 }
Linux with added FPC-III support