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Merge branch 'master' of git://git.infradead.org/users/pcmoore/selinux into next
[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 <scsi/scsi_tcq.h>
22 #include <scsi/iscsi_proto.h>
23 #include <target/target_core_base.h>
24 #include <target/target_core_fabric.h>
25 #include <target/target_core_configfs.h>
26 #include <target/iscsi/iscsi_transport.h>
27
28 #include "iscsi_target_core.h"
29 #include "iscsi_target_parameters.h"
30 #include "iscsi_target_seq_pdu_list.h"
31 #include "iscsi_target_datain_values.h"
32 #include "iscsi_target_erl0.h"
33 #include "iscsi_target_erl1.h"
34 #include "iscsi_target_erl2.h"
35 #include "iscsi_target_tpg.h"
36 #include "iscsi_target_tq.h"
37 #include "iscsi_target_util.h"
38 #include "iscsi_target.h"
39
40 #define PRINT_BUFF(buff, len) \
41 { \
42 int zzz; \
43 \
44 pr_debug("%d:\n", __LINE__); \
45 for (zzz = 0; zzz < len; zzz++) { \
46 if (zzz % 16 == 0) { \
47 if (zzz) \
48 pr_debug("\n"); \
49 pr_debug("%4i: ", zzz); \
50 } \
51 pr_debug("%02x ", (unsigned char) (buff)[zzz]); \
52 } \
53 if ((len + 1) % 16) \
54 pr_debug("\n"); \
55 }
56
57 extern struct list_head g_tiqn_list;
58 extern spinlock_t tiqn_lock;
59
60 /*
61 * Called with cmd->r2t_lock held.
62 */
63 int iscsit_add_r2t_to_list(
64 struct iscsi_cmd *cmd,
65 u32 offset,
66 u32 xfer_len,
67 int recovery,
68 u32 r2t_sn)
69 {
70 struct iscsi_r2t *r2t;
71
72 r2t = kmem_cache_zalloc(lio_r2t_cache, GFP_ATOMIC);
73 if (!r2t) {
74 pr_err("Unable to allocate memory for struct iscsi_r2t.\n");
75 return -1;
76 }
77 INIT_LIST_HEAD(&r2t->r2t_list);
78
79 r2t->recovery_r2t = recovery;
80 r2t->r2t_sn = (!r2t_sn) ? cmd->r2t_sn++ : r2t_sn;
81 r2t->offset = offset;
82 r2t->xfer_len = xfer_len;
83 list_add_tail(&r2t->r2t_list, &cmd->cmd_r2t_list);
84 spin_unlock_bh(&cmd->r2t_lock);
85
86 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, ISTATE_SEND_R2T);
87
88 spin_lock_bh(&cmd->r2t_lock);
89 return 0;
90 }
91
92 struct iscsi_r2t *iscsit_get_r2t_for_eos(
93 struct iscsi_cmd *cmd,
94 u32 offset,
95 u32 length)
96 {
97 struct iscsi_r2t *r2t;
98
99 spin_lock_bh(&cmd->r2t_lock);
100 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
101 if ((r2t->offset <= offset) &&
102 (r2t->offset + r2t->xfer_len) >= (offset + length)) {
103 spin_unlock_bh(&cmd->r2t_lock);
104 return r2t;
105 }
106 }
107 spin_unlock_bh(&cmd->r2t_lock);
108
109 pr_err("Unable to locate R2T for Offset: %u, Length:"
110 " %u\n", offset, length);
111 return NULL;
112 }
113
114 struct iscsi_r2t *iscsit_get_r2t_from_list(struct iscsi_cmd *cmd)
115 {
116 struct iscsi_r2t *r2t;
117
118 spin_lock_bh(&cmd->r2t_lock);
119 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
120 if (!r2t->sent_r2t) {
121 spin_unlock_bh(&cmd->r2t_lock);
122 return r2t;
123 }
124 }
125 spin_unlock_bh(&cmd->r2t_lock);
126
127 pr_err("Unable to locate next R2T to send for ITT:"
128 " 0x%08x.\n", cmd->init_task_tag);
129 return NULL;
130 }
131
132 /*
133 * Called with cmd->r2t_lock held.
134 */
135 void iscsit_free_r2t(struct iscsi_r2t *r2t, struct iscsi_cmd *cmd)
136 {
137 list_del(&r2t->r2t_list);
138 kmem_cache_free(lio_r2t_cache, r2t);
139 }
140
141 void iscsit_free_r2ts_from_list(struct iscsi_cmd *cmd)
142 {
143 struct iscsi_r2t *r2t, *r2t_tmp;
144
145 spin_lock_bh(&cmd->r2t_lock);
146 list_for_each_entry_safe(r2t, r2t_tmp, &cmd->cmd_r2t_list, r2t_list)
147 iscsit_free_r2t(r2t, cmd);
148 spin_unlock_bh(&cmd->r2t_lock);
149 }
150
151 /*
152 * May be called from software interrupt (timer) context for allocating
153 * iSCSI NopINs.
154 */
155 struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *conn, gfp_t gfp_mask)
156 {
157 struct iscsi_cmd *cmd;
158 struct se_session *se_sess = conn->sess->se_sess;
159 int size, tag;
160
161 tag = percpu_ida_alloc(&se_sess->sess_tag_pool, gfp_mask);
162 size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;
163 cmd = (struct iscsi_cmd *)(se_sess->sess_cmd_map + (tag * size));
164 memset(cmd, 0, size);
165
166 cmd->se_cmd.map_tag = tag;
167 cmd->conn = conn;
168 INIT_LIST_HEAD(&cmd->i_conn_node);
169 INIT_LIST_HEAD(&cmd->datain_list);
170 INIT_LIST_HEAD(&cmd->cmd_r2t_list);
171 spin_lock_init(&cmd->datain_lock);
172 spin_lock_init(&cmd->dataout_timeout_lock);
173 spin_lock_init(&cmd->istate_lock);
174 spin_lock_init(&cmd->error_lock);
175 spin_lock_init(&cmd->r2t_lock);
176
177 return cmd;
178 }
179 EXPORT_SYMBOL(iscsit_allocate_cmd);
180
181 struct iscsi_seq *iscsit_get_seq_holder_for_datain(
182 struct iscsi_cmd *cmd,
183 u32 seq_send_order)
184 {
185 u32 i;
186
187 for (i = 0; i < cmd->seq_count; i++)
188 if (cmd->seq_list[i].seq_send_order == seq_send_order)
189 return &cmd->seq_list[i];
190
191 return NULL;
192 }
193
194 struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsi_cmd *cmd)
195 {
196 u32 i;
197
198 if (!cmd->seq_list) {
199 pr_err("struct iscsi_cmd->seq_list is NULL!\n");
200 return NULL;
201 }
202
203 for (i = 0; i < cmd->seq_count; i++) {
204 if (cmd->seq_list[i].type != SEQTYPE_NORMAL)
205 continue;
206 if (cmd->seq_list[i].seq_send_order == cmd->seq_send_order) {
207 cmd->seq_send_order++;
208 return &cmd->seq_list[i];
209 }
210 }
211
212 return NULL;
213 }
214
215 struct iscsi_r2t *iscsit_get_holder_for_r2tsn(
216 struct iscsi_cmd *cmd,
217 u32 r2t_sn)
218 {
219 struct iscsi_r2t *r2t;
220
221 spin_lock_bh(&cmd->r2t_lock);
222 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
223 if (r2t->r2t_sn == r2t_sn) {
224 spin_unlock_bh(&cmd->r2t_lock);
225 return r2t;
226 }
227 }
228 spin_unlock_bh(&cmd->r2t_lock);
229
230 return NULL;
231 }
232
233 static inline int iscsit_check_received_cmdsn(struct iscsi_session *sess, u32 cmdsn)
234 {
235 int ret;
236
237 /*
238 * This is the proper method of checking received CmdSN against
239 * ExpCmdSN and MaxCmdSN values, as well as accounting for out
240 * or order CmdSNs due to multiple connection sessions and/or
241 * CRC failures.
242 */
243 if (iscsi_sna_gt(cmdsn, sess->max_cmd_sn)) {
244 pr_err("Received CmdSN: 0x%08x is greater than"
245 " MaxCmdSN: 0x%08x, ignoring.\n", cmdsn,
246 sess->max_cmd_sn);
247 ret = CMDSN_MAXCMDSN_OVERRUN;
248
249 } else if (cmdsn == sess->exp_cmd_sn) {
250 sess->exp_cmd_sn++;
251 pr_debug("Received CmdSN matches ExpCmdSN,"
252 " incremented ExpCmdSN to: 0x%08x\n",
253 sess->exp_cmd_sn);
254 ret = CMDSN_NORMAL_OPERATION;
255
256 } else if (iscsi_sna_gt(cmdsn, sess->exp_cmd_sn)) {
257 pr_debug("Received CmdSN: 0x%08x is greater"
258 " than ExpCmdSN: 0x%08x, not acknowledging.\n",
259 cmdsn, sess->exp_cmd_sn);
260 ret = CMDSN_HIGHER_THAN_EXP;
261
262 } else {
263 pr_err("Received CmdSN: 0x%08x is less than"
264 " ExpCmdSN: 0x%08x, ignoring.\n", cmdsn,
265 sess->exp_cmd_sn);
266 ret = CMDSN_LOWER_THAN_EXP;
267 }
268
269 return ret;
270 }
271
272 /*
273 * Commands may be received out of order if MC/S is in use.
274 * Ensure they are executed in CmdSN order.
275 */
276 int iscsit_sequence_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
277 unsigned char *buf, __be32 cmdsn)
278 {
279 int ret, cmdsn_ret;
280 bool reject = false;
281 u8 reason = ISCSI_REASON_BOOKMARK_NO_RESOURCES;
282
283 mutex_lock(&conn->sess->cmdsn_mutex);
284
285 cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, be32_to_cpu(cmdsn));
286 switch (cmdsn_ret) {
287 case CMDSN_NORMAL_OPERATION:
288 ret = iscsit_execute_cmd(cmd, 0);
289 if ((ret >= 0) && !list_empty(&conn->sess->sess_ooo_cmdsn_list))
290 iscsit_execute_ooo_cmdsns(conn->sess);
291 else if (ret < 0) {
292 reject = true;
293 ret = CMDSN_ERROR_CANNOT_RECOVER;
294 }
295 break;
296 case CMDSN_HIGHER_THAN_EXP:
297 ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, be32_to_cpu(cmdsn));
298 if (ret < 0) {
299 reject = true;
300 ret = CMDSN_ERROR_CANNOT_RECOVER;
301 break;
302 }
303 ret = CMDSN_HIGHER_THAN_EXP;
304 break;
305 case CMDSN_LOWER_THAN_EXP:
306 case CMDSN_MAXCMDSN_OVERRUN:
307 default:
308 cmd->i_state = ISTATE_REMOVE;
309 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
310 /*
311 * Existing callers for iscsit_sequence_cmd() will silently
312 * ignore commands with CMDSN_LOWER_THAN_EXP, so force this
313 * return for CMDSN_MAXCMDSN_OVERRUN as well..
314 */
315 ret = CMDSN_LOWER_THAN_EXP;
316 break;
317 }
318 mutex_unlock(&conn->sess->cmdsn_mutex);
319
320 if (reject)
321 iscsit_reject_cmd(cmd, reason, buf);
322
323 return ret;
324 }
325 EXPORT_SYMBOL(iscsit_sequence_cmd);
326
327 int iscsit_check_unsolicited_dataout(struct iscsi_cmd *cmd, unsigned char *buf)
328 {
329 struct iscsi_conn *conn = cmd->conn;
330 struct se_cmd *se_cmd = &cmd->se_cmd;
331 struct iscsi_data *hdr = (struct iscsi_data *) buf;
332 u32 payload_length = ntoh24(hdr->dlength);
333
334 if (conn->sess->sess_ops->InitialR2T) {
335 pr_err("Received unexpected unsolicited data"
336 " while InitialR2T=Yes, protocol error.\n");
337 transport_send_check_condition_and_sense(se_cmd,
338 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
339 return -1;
340 }
341
342 if ((cmd->first_burst_len + payload_length) >
343 conn->sess->sess_ops->FirstBurstLength) {
344 pr_err("Total %u bytes exceeds FirstBurstLength: %u"
345 " for this Unsolicited DataOut Burst.\n",
346 (cmd->first_burst_len + payload_length),
347 conn->sess->sess_ops->FirstBurstLength);
348 transport_send_check_condition_and_sense(se_cmd,
349 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
350 return -1;
351 }
352
353 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))
354 return 0;
355
356 if (((cmd->first_burst_len + payload_length) != cmd->se_cmd.data_length) &&
357 ((cmd->first_burst_len + payload_length) !=
358 conn->sess->sess_ops->FirstBurstLength)) {
359 pr_err("Unsolicited non-immediate data received %u"
360 " does not equal FirstBurstLength: %u, and does"
361 " not equal ExpXferLen %u.\n",
362 (cmd->first_burst_len + payload_length),
363 conn->sess->sess_ops->FirstBurstLength, cmd->se_cmd.data_length);
364 transport_send_check_condition_and_sense(se_cmd,
365 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
366 return -1;
367 }
368 return 0;
369 }
370
371 struct iscsi_cmd *iscsit_find_cmd_from_itt(
372 struct iscsi_conn *conn,
373 itt_t init_task_tag)
374 {
375 struct iscsi_cmd *cmd;
376
377 spin_lock_bh(&conn->cmd_lock);
378 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
379 if (cmd->init_task_tag == init_task_tag) {
380 spin_unlock_bh(&conn->cmd_lock);
381 return cmd;
382 }
383 }
384 spin_unlock_bh(&conn->cmd_lock);
385
386 pr_err("Unable to locate ITT: 0x%08x on CID: %hu",
387 init_task_tag, conn->cid);
388 return NULL;
389 }
390
391 struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump(
392 struct iscsi_conn *conn,
393 itt_t init_task_tag,
394 u32 length)
395 {
396 struct iscsi_cmd *cmd;
397
398 spin_lock_bh(&conn->cmd_lock);
399 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
400 if (cmd->init_task_tag == init_task_tag) {
401 spin_unlock_bh(&conn->cmd_lock);
402 return cmd;
403 }
404 }
405 spin_unlock_bh(&conn->cmd_lock);
406
407 pr_err("Unable to locate ITT: 0x%08x on CID: %hu,"
408 " dumping payload\n", init_task_tag, conn->cid);
409 if (length)
410 iscsit_dump_data_payload(conn, length, 1);
411
412 return NULL;
413 }
414
415 struct iscsi_cmd *iscsit_find_cmd_from_ttt(
416 struct iscsi_conn *conn,
417 u32 targ_xfer_tag)
418 {
419 struct iscsi_cmd *cmd = NULL;
420
421 spin_lock_bh(&conn->cmd_lock);
422 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
423 if (cmd->targ_xfer_tag == targ_xfer_tag) {
424 spin_unlock_bh(&conn->cmd_lock);
425 return cmd;
426 }
427 }
428 spin_unlock_bh(&conn->cmd_lock);
429
430 pr_err("Unable to locate TTT: 0x%08x on CID: %hu\n",
431 targ_xfer_tag, conn->cid);
432 return NULL;
433 }
434
435 int iscsit_find_cmd_for_recovery(
436 struct iscsi_session *sess,
437 struct iscsi_cmd **cmd_ptr,
438 struct iscsi_conn_recovery **cr_ptr,
439 itt_t init_task_tag)
440 {
441 struct iscsi_cmd *cmd = NULL;
442 struct iscsi_conn_recovery *cr;
443 /*
444 * Scan through the inactive connection recovery list's command list.
445 * If init_task_tag matches the command is still alligent.
446 */
447 spin_lock(&sess->cr_i_lock);
448 list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) {
449 spin_lock(&cr->conn_recovery_cmd_lock);
450 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
451 if (cmd->init_task_tag == init_task_tag) {
452 spin_unlock(&cr->conn_recovery_cmd_lock);
453 spin_unlock(&sess->cr_i_lock);
454
455 *cr_ptr = cr;
456 *cmd_ptr = cmd;
457 return -2;
458 }
459 }
460 spin_unlock(&cr->conn_recovery_cmd_lock);
461 }
462 spin_unlock(&sess->cr_i_lock);
463 /*
464 * Scan through the active connection recovery list's command list.
465 * If init_task_tag matches the command is ready to be reassigned.
466 */
467 spin_lock(&sess->cr_a_lock);
468 list_for_each_entry(cr, &sess->cr_active_list, cr_list) {
469 spin_lock(&cr->conn_recovery_cmd_lock);
470 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
471 if (cmd->init_task_tag == init_task_tag) {
472 spin_unlock(&cr->conn_recovery_cmd_lock);
473 spin_unlock(&sess->cr_a_lock);
474
475 *cr_ptr = cr;
476 *cmd_ptr = cmd;
477 return 0;
478 }
479 }
480 spin_unlock(&cr->conn_recovery_cmd_lock);
481 }
482 spin_unlock(&sess->cr_a_lock);
483
484 return -1;
485 }
486
487 void iscsit_add_cmd_to_immediate_queue(
488 struct iscsi_cmd *cmd,
489 struct iscsi_conn *conn,
490 u8 state)
491 {
492 struct iscsi_queue_req *qr;
493
494 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
495 if (!qr) {
496 pr_err("Unable to allocate memory for"
497 " struct iscsi_queue_req\n");
498 return;
499 }
500 INIT_LIST_HEAD(&qr->qr_list);
501 qr->cmd = cmd;
502 qr->state = state;
503
504 spin_lock_bh(&conn->immed_queue_lock);
505 list_add_tail(&qr->qr_list, &conn->immed_queue_list);
506 atomic_inc(&cmd->immed_queue_count);
507 atomic_set(&conn->check_immediate_queue, 1);
508 spin_unlock_bh(&conn->immed_queue_lock);
509
510 wake_up(&conn->queues_wq);
511 }
512
513 struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *conn)
514 {
515 struct iscsi_queue_req *qr;
516
517 spin_lock_bh(&conn->immed_queue_lock);
518 if (list_empty(&conn->immed_queue_list)) {
519 spin_unlock_bh(&conn->immed_queue_lock);
520 return NULL;
521 }
522 qr = list_first_entry(&conn->immed_queue_list,
523 struct iscsi_queue_req, qr_list);
524
525 list_del(&qr->qr_list);
526 if (qr->cmd)
527 atomic_dec(&qr->cmd->immed_queue_count);
528 spin_unlock_bh(&conn->immed_queue_lock);
529
530 return qr;
531 }
532
533 static void iscsit_remove_cmd_from_immediate_queue(
534 struct iscsi_cmd *cmd,
535 struct iscsi_conn *conn)
536 {
537 struct iscsi_queue_req *qr, *qr_tmp;
538
539 spin_lock_bh(&conn->immed_queue_lock);
540 if (!atomic_read(&cmd->immed_queue_count)) {
541 spin_unlock_bh(&conn->immed_queue_lock);
542 return;
543 }
544
545 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
546 if (qr->cmd != cmd)
547 continue;
548
549 atomic_dec(&qr->cmd->immed_queue_count);
550 list_del(&qr->qr_list);
551 kmem_cache_free(lio_qr_cache, qr);
552 }
553 spin_unlock_bh(&conn->immed_queue_lock);
554
555 if (atomic_read(&cmd->immed_queue_count)) {
556 pr_err("ITT: 0x%08x immed_queue_count: %d\n",
557 cmd->init_task_tag,
558 atomic_read(&cmd->immed_queue_count));
559 }
560 }
561
562 void iscsit_add_cmd_to_response_queue(
563 struct iscsi_cmd *cmd,
564 struct iscsi_conn *conn,
565 u8 state)
566 {
567 struct iscsi_queue_req *qr;
568
569 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
570 if (!qr) {
571 pr_err("Unable to allocate memory for"
572 " struct iscsi_queue_req\n");
573 return;
574 }
575 INIT_LIST_HEAD(&qr->qr_list);
576 qr->cmd = cmd;
577 qr->state = state;
578
579 spin_lock_bh(&conn->response_queue_lock);
580 list_add_tail(&qr->qr_list, &conn->response_queue_list);
581 atomic_inc(&cmd->response_queue_count);
582 spin_unlock_bh(&conn->response_queue_lock);
583
584 wake_up(&conn->queues_wq);
585 }
586
587 struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *conn)
588 {
589 struct iscsi_queue_req *qr;
590
591 spin_lock_bh(&conn->response_queue_lock);
592 if (list_empty(&conn->response_queue_list)) {
593 spin_unlock_bh(&conn->response_queue_lock);
594 return NULL;
595 }
596
597 qr = list_first_entry(&conn->response_queue_list,
598 struct iscsi_queue_req, qr_list);
599
600 list_del(&qr->qr_list);
601 if (qr->cmd)
602 atomic_dec(&qr->cmd->response_queue_count);
603 spin_unlock_bh(&conn->response_queue_lock);
604
605 return qr;
606 }
607
608 static void iscsit_remove_cmd_from_response_queue(
609 struct iscsi_cmd *cmd,
610 struct iscsi_conn *conn)
611 {
612 struct iscsi_queue_req *qr, *qr_tmp;
613
614 spin_lock_bh(&conn->response_queue_lock);
615 if (!atomic_read(&cmd->response_queue_count)) {
616 spin_unlock_bh(&conn->response_queue_lock);
617 return;
618 }
619
620 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
621 qr_list) {
622 if (qr->cmd != cmd)
623 continue;
624
625 atomic_dec(&qr->cmd->response_queue_count);
626 list_del(&qr->qr_list);
627 kmem_cache_free(lio_qr_cache, qr);
628 }
629 spin_unlock_bh(&conn->response_queue_lock);
630
631 if (atomic_read(&cmd->response_queue_count)) {
632 pr_err("ITT: 0x%08x response_queue_count: %d\n",
633 cmd->init_task_tag,
634 atomic_read(&cmd->response_queue_count));
635 }
636 }
637
638 bool iscsit_conn_all_queues_empty(struct iscsi_conn *conn)
639 {
640 bool empty;
641
642 spin_lock_bh(&conn->immed_queue_lock);
643 empty = list_empty(&conn->immed_queue_list);
644 spin_unlock_bh(&conn->immed_queue_lock);
645
646 if (!empty)
647 return empty;
648
649 spin_lock_bh(&conn->response_queue_lock);
650 empty = list_empty(&conn->response_queue_list);
651 spin_unlock_bh(&conn->response_queue_lock);
652
653 return empty;
654 }
655
656 void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn)
657 {
658 struct iscsi_queue_req *qr, *qr_tmp;
659
660 spin_lock_bh(&conn->immed_queue_lock);
661 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
662 list_del(&qr->qr_list);
663 if (qr->cmd)
664 atomic_dec(&qr->cmd->immed_queue_count);
665
666 kmem_cache_free(lio_qr_cache, qr);
667 }
668 spin_unlock_bh(&conn->immed_queue_lock);
669
670 spin_lock_bh(&conn->response_queue_lock);
671 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
672 qr_list) {
673 list_del(&qr->qr_list);
674 if (qr->cmd)
675 atomic_dec(&qr->cmd->response_queue_count);
676
677 kmem_cache_free(lio_qr_cache, qr);
678 }
679 spin_unlock_bh(&conn->response_queue_lock);
680 }
681
682 void iscsit_release_cmd(struct iscsi_cmd *cmd)
683 {
684 struct iscsi_session *sess;
685 struct se_cmd *se_cmd = &cmd->se_cmd;
686
687 if (cmd->conn)
688 sess = cmd->conn->sess;
689 else
690 sess = cmd->sess;
691
692 BUG_ON(!sess || !sess->se_sess);
693
694 kfree(cmd->buf_ptr);
695 kfree(cmd->pdu_list);
696 kfree(cmd->seq_list);
697 kfree(cmd->tmr_req);
698 kfree(cmd->iov_data);
699 kfree(cmd->text_in_ptr);
700
701 percpu_ida_free(&sess->se_sess->sess_tag_pool, se_cmd->map_tag);
702 }
703 EXPORT_SYMBOL(iscsit_release_cmd);
704
705 static void __iscsit_free_cmd(struct iscsi_cmd *cmd, bool scsi_cmd,
706 bool check_queues)
707 {
708 struct iscsi_conn *conn = cmd->conn;
709
710 if (scsi_cmd) {
711 if (cmd->data_direction == DMA_TO_DEVICE) {
712 iscsit_stop_dataout_timer(cmd);
713 iscsit_free_r2ts_from_list(cmd);
714 }
715 if (cmd->data_direction == DMA_FROM_DEVICE)
716 iscsit_free_all_datain_reqs(cmd);
717 }
718
719 if (conn && check_queues) {
720 iscsit_remove_cmd_from_immediate_queue(cmd, conn);
721 iscsit_remove_cmd_from_response_queue(cmd, conn);
722 }
723 }
724
725 void iscsit_free_cmd(struct iscsi_cmd *cmd, bool shutdown)
726 {
727 struct se_cmd *se_cmd = NULL;
728 int rc;
729 /*
730 * Determine if a struct se_cmd is associated with
731 * this struct iscsi_cmd.
732 */
733 switch (cmd->iscsi_opcode) {
734 case ISCSI_OP_SCSI_CMD:
735 se_cmd = &cmd->se_cmd;
736 __iscsit_free_cmd(cmd, true, shutdown);
737 /*
738 * Fallthrough
739 */
740 case ISCSI_OP_SCSI_TMFUNC:
741 rc = transport_generic_free_cmd(&cmd->se_cmd, shutdown);
742 if (!rc && shutdown && se_cmd && se_cmd->se_sess) {
743 __iscsit_free_cmd(cmd, true, shutdown);
744 target_put_sess_cmd(se_cmd->se_sess, se_cmd);
745 }
746 break;
747 case ISCSI_OP_REJECT:
748 /*
749 * Handle special case for REJECT when iscsi_add_reject*() has
750 * overwritten the original iscsi_opcode assignment, and the
751 * associated cmd->se_cmd needs to be released.
752 */
753 if (cmd->se_cmd.se_tfo != NULL) {
754 se_cmd = &cmd->se_cmd;
755 __iscsit_free_cmd(cmd, true, shutdown);
756
757 rc = transport_generic_free_cmd(&cmd->se_cmd, shutdown);
758 if (!rc && shutdown && se_cmd->se_sess) {
759 __iscsit_free_cmd(cmd, true, shutdown);
760 target_put_sess_cmd(se_cmd->se_sess, se_cmd);
761 }
762 break;
763 }
764 /* Fall-through */
765 default:
766 __iscsit_free_cmd(cmd, false, shutdown);
767 iscsit_release_cmd(cmd);
768 break;
769 }
770 }
771
772 int iscsit_check_session_usage_count(struct iscsi_session *sess)
773 {
774 spin_lock_bh(&sess->session_usage_lock);
775 if (sess->session_usage_count != 0) {
776 sess->session_waiting_on_uc = 1;
777 spin_unlock_bh(&sess->session_usage_lock);
778 if (in_interrupt())
779 return 2;
780
781 wait_for_completion(&sess->session_waiting_on_uc_comp);
782 return 1;
783 }
784 spin_unlock_bh(&sess->session_usage_lock);
785
786 return 0;
787 }
788
789 void iscsit_dec_session_usage_count(struct iscsi_session *sess)
790 {
791 spin_lock_bh(&sess->session_usage_lock);
792 sess->session_usage_count--;
793
794 if (!sess->session_usage_count && sess->session_waiting_on_uc)
795 complete(&sess->session_waiting_on_uc_comp);
796
797 spin_unlock_bh(&sess->session_usage_lock);
798 }
799
800 void iscsit_inc_session_usage_count(struct iscsi_session *sess)
801 {
802 spin_lock_bh(&sess->session_usage_lock);
803 sess->session_usage_count++;
804 spin_unlock_bh(&sess->session_usage_lock);
805 }
806
807 /*
808 * Setup conn->if_marker and conn->of_marker values based upon
809 * the initial marker-less interval. (see iSCSI v19 A.2)
810 */
811 int iscsit_set_sync_and_steering_values(struct iscsi_conn *conn)
812 {
813 int login_ifmarker_count = 0, login_ofmarker_count = 0, next_marker = 0;
814 /*
815 * IFMarkInt and OFMarkInt are negotiated as 32-bit words.
816 */
817 u32 IFMarkInt = (conn->conn_ops->IFMarkInt * 4);
818 u32 OFMarkInt = (conn->conn_ops->OFMarkInt * 4);
819
820 if (conn->conn_ops->OFMarker) {
821 /*
822 * Account for the first Login Command received not
823 * via iscsi_recv_msg().
824 */
825 conn->of_marker += ISCSI_HDR_LEN;
826 if (conn->of_marker <= OFMarkInt) {
827 conn->of_marker = (OFMarkInt - conn->of_marker);
828 } else {
829 login_ofmarker_count = (conn->of_marker / OFMarkInt);
830 next_marker = (OFMarkInt * (login_ofmarker_count + 1)) +
831 (login_ofmarker_count * MARKER_SIZE);
832 conn->of_marker = (next_marker - conn->of_marker);
833 }
834 conn->of_marker_offset = 0;
835 pr_debug("Setting OFMarker value to %u based on Initial"
836 " Markerless Interval.\n", conn->of_marker);
837 }
838
839 if (conn->conn_ops->IFMarker) {
840 if (conn->if_marker <= IFMarkInt) {
841 conn->if_marker = (IFMarkInt - conn->if_marker);
842 } else {
843 login_ifmarker_count = (conn->if_marker / IFMarkInt);
844 next_marker = (IFMarkInt * (login_ifmarker_count + 1)) +
845 (login_ifmarker_count * MARKER_SIZE);
846 conn->if_marker = (next_marker - conn->if_marker);
847 }
848 pr_debug("Setting IFMarker value to %u based on Initial"
849 " Markerless Interval.\n", conn->if_marker);
850 }
851
852 return 0;
853 }
854
855 struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid)
856 {
857 struct iscsi_conn *conn;
858
859 spin_lock_bh(&sess->conn_lock);
860 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
861 if ((conn->cid == cid) &&
862 (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) {
863 iscsit_inc_conn_usage_count(conn);
864 spin_unlock_bh(&sess->conn_lock);
865 return conn;
866 }
867 }
868 spin_unlock_bh(&sess->conn_lock);
869
870 return NULL;
871 }
872
873 struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid)
874 {
875 struct iscsi_conn *conn;
876
877 spin_lock_bh(&sess->conn_lock);
878 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
879 if (conn->cid == cid) {
880 iscsit_inc_conn_usage_count(conn);
881 spin_lock(&conn->state_lock);
882 atomic_set(&conn->connection_wait_rcfr, 1);
883 spin_unlock(&conn->state_lock);
884 spin_unlock_bh(&sess->conn_lock);
885 return conn;
886 }
887 }
888 spin_unlock_bh(&sess->conn_lock);
889
890 return NULL;
891 }
892
893 void iscsit_check_conn_usage_count(struct iscsi_conn *conn)
894 {
895 spin_lock_bh(&conn->conn_usage_lock);
896 if (conn->conn_usage_count != 0) {
897 conn->conn_waiting_on_uc = 1;
898 spin_unlock_bh(&conn->conn_usage_lock);
899
900 wait_for_completion(&conn->conn_waiting_on_uc_comp);
901 return;
902 }
903 spin_unlock_bh(&conn->conn_usage_lock);
904 }
905
906 void iscsit_dec_conn_usage_count(struct iscsi_conn *conn)
907 {
908 spin_lock_bh(&conn->conn_usage_lock);
909 conn->conn_usage_count--;
910
911 if (!conn->conn_usage_count && conn->conn_waiting_on_uc)
912 complete(&conn->conn_waiting_on_uc_comp);
913
914 spin_unlock_bh(&conn->conn_usage_lock);
915 }
916
917 void iscsit_inc_conn_usage_count(struct iscsi_conn *conn)
918 {
919 spin_lock_bh(&conn->conn_usage_lock);
920 conn->conn_usage_count++;
921 spin_unlock_bh(&conn->conn_usage_lock);
922 }
923
924 static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response)
925 {
926 u8 state;
927 struct iscsi_cmd *cmd;
928
929 cmd = iscsit_allocate_cmd(conn, GFP_ATOMIC);
930 if (!cmd)
931 return -1;
932
933 cmd->iscsi_opcode = ISCSI_OP_NOOP_IN;
934 state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE :
935 ISTATE_SEND_NOPIN_NO_RESPONSE;
936 cmd->init_task_tag = RESERVED_ITT;
937 spin_lock_bh(&conn->sess->ttt_lock);
938 cmd->targ_xfer_tag = (want_response) ? conn->sess->targ_xfer_tag++ :
939 0xFFFFFFFF;
940 if (want_response && (cmd->targ_xfer_tag == 0xFFFFFFFF))
941 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
942 spin_unlock_bh(&conn->sess->ttt_lock);
943
944 spin_lock_bh(&conn->cmd_lock);
945 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
946 spin_unlock_bh(&conn->cmd_lock);
947
948 if (want_response)
949 iscsit_start_nopin_response_timer(conn);
950 iscsit_add_cmd_to_immediate_queue(cmd, conn, state);
951
952 return 0;
953 }
954
955 static void iscsit_handle_nopin_response_timeout(unsigned long data)
956 {
957 struct iscsi_conn *conn = (struct iscsi_conn *) data;
958
959 iscsit_inc_conn_usage_count(conn);
960
961 spin_lock_bh(&conn->nopin_timer_lock);
962 if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) {
963 spin_unlock_bh(&conn->nopin_timer_lock);
964 iscsit_dec_conn_usage_count(conn);
965 return;
966 }
967
968 pr_debug("Did not receive response to NOPIN on CID: %hu on"
969 " SID: %u, failing connection.\n", conn->cid,
970 conn->sess->sid);
971 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
972 spin_unlock_bh(&conn->nopin_timer_lock);
973
974 {
975 struct iscsi_portal_group *tpg = conn->sess->tpg;
976 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
977
978 if (tiqn) {
979 spin_lock_bh(&tiqn->sess_err_stats.lock);
980 strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
981 conn->sess->sess_ops->InitiatorName);
982 tiqn->sess_err_stats.last_sess_failure_type =
983 ISCSI_SESS_ERR_CXN_TIMEOUT;
984 tiqn->sess_err_stats.cxn_timeout_errors++;
985 atomic_long_inc(&conn->sess->conn_timeout_errors);
986 spin_unlock_bh(&tiqn->sess_err_stats.lock);
987 }
988 }
989
990 iscsit_cause_connection_reinstatement(conn, 0);
991 iscsit_dec_conn_usage_count(conn);
992 }
993
994 void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn)
995 {
996 struct iscsi_session *sess = conn->sess;
997 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
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
1005 mod_timer(&conn->nopin_response_timer,
1006 (get_jiffies_64() + na->nopin_response_timeout * HZ));
1007 spin_unlock_bh(&conn->nopin_timer_lock);
1008 }
1009
1010 /*
1011 * Called with conn->nopin_timer_lock held.
1012 */
1013 void iscsit_start_nopin_response_timer(struct iscsi_conn *conn)
1014 {
1015 struct iscsi_session *sess = conn->sess;
1016 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1017
1018 spin_lock_bh(&conn->nopin_timer_lock);
1019 if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) {
1020 spin_unlock_bh(&conn->nopin_timer_lock);
1021 return;
1022 }
1023
1024 init_timer(&conn->nopin_response_timer);
1025 conn->nopin_response_timer.expires =
1026 (get_jiffies_64() + na->nopin_response_timeout * HZ);
1027 conn->nopin_response_timer.data = (unsigned long)conn;
1028 conn->nopin_response_timer.function = iscsit_handle_nopin_response_timeout;
1029 conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP;
1030 conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING;
1031 add_timer(&conn->nopin_response_timer);
1032
1033 pr_debug("Started NOPIN Response Timer on CID: %d to %u"
1034 " seconds\n", conn->cid, na->nopin_response_timeout);
1035 spin_unlock_bh(&conn->nopin_timer_lock);
1036 }
1037
1038 void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn)
1039 {
1040 spin_lock_bh(&conn->nopin_timer_lock);
1041 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
1042 spin_unlock_bh(&conn->nopin_timer_lock);
1043 return;
1044 }
1045 conn->nopin_response_timer_flags |= ISCSI_TF_STOP;
1046 spin_unlock_bh(&conn->nopin_timer_lock);
1047
1048 del_timer_sync(&conn->nopin_response_timer);
1049
1050 spin_lock_bh(&conn->nopin_timer_lock);
1051 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
1052 spin_unlock_bh(&conn->nopin_timer_lock);
1053 }
1054
1055 static void iscsit_handle_nopin_timeout(unsigned long data)
1056 {
1057 struct iscsi_conn *conn = (struct iscsi_conn *) data;
1058
1059 iscsit_inc_conn_usage_count(conn);
1060
1061 spin_lock_bh(&conn->nopin_timer_lock);
1062 if (conn->nopin_timer_flags & ISCSI_TF_STOP) {
1063 spin_unlock_bh(&conn->nopin_timer_lock);
1064 iscsit_dec_conn_usage_count(conn);
1065 return;
1066 }
1067 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1068 spin_unlock_bh(&conn->nopin_timer_lock);
1069
1070 iscsit_add_nopin(conn, 1);
1071 iscsit_dec_conn_usage_count(conn);
1072 }
1073
1074 /*
1075 * Called with conn->nopin_timer_lock held.
1076 */
1077 void __iscsit_start_nopin_timer(struct iscsi_conn *conn)
1078 {
1079 struct iscsi_session *sess = conn->sess;
1080 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1081 /*
1082 * NOPIN timeout is disabled.
1083 */
1084 if (!na->nopin_timeout)
1085 return;
1086
1087 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING)
1088 return;
1089
1090 init_timer(&conn->nopin_timer);
1091 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1092 conn->nopin_timer.data = (unsigned long)conn;
1093 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1094 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1095 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1096 add_timer(&conn->nopin_timer);
1097
1098 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1099 " interval\n", conn->cid, na->nopin_timeout);
1100 }
1101
1102 void iscsit_start_nopin_timer(struct iscsi_conn *conn)
1103 {
1104 struct iscsi_session *sess = conn->sess;
1105 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1106 /*
1107 * NOPIN timeout is disabled..
1108 */
1109 if (!na->nopin_timeout)
1110 return;
1111
1112 spin_lock_bh(&conn->nopin_timer_lock);
1113 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) {
1114 spin_unlock_bh(&conn->nopin_timer_lock);
1115 return;
1116 }
1117
1118 init_timer(&conn->nopin_timer);
1119 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1120 conn->nopin_timer.data = (unsigned long)conn;
1121 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1122 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1123 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1124 add_timer(&conn->nopin_timer);
1125
1126 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1127 " interval\n", conn->cid, na->nopin_timeout);
1128 spin_unlock_bh(&conn->nopin_timer_lock);
1129 }
1130
1131 void iscsit_stop_nopin_timer(struct iscsi_conn *conn)
1132 {
1133 spin_lock_bh(&conn->nopin_timer_lock);
1134 if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) {
1135 spin_unlock_bh(&conn->nopin_timer_lock);
1136 return;
1137 }
1138 conn->nopin_timer_flags |= ISCSI_TF_STOP;
1139 spin_unlock_bh(&conn->nopin_timer_lock);
1140
1141 del_timer_sync(&conn->nopin_timer);
1142
1143 spin_lock_bh(&conn->nopin_timer_lock);
1144 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1145 spin_unlock_bh(&conn->nopin_timer_lock);
1146 }
1147
1148 int iscsit_send_tx_data(
1149 struct iscsi_cmd *cmd,
1150 struct iscsi_conn *conn,
1151 int use_misc)
1152 {
1153 int tx_sent, tx_size;
1154 u32 iov_count;
1155 struct kvec *iov;
1156
1157 send_data:
1158 tx_size = cmd->tx_size;
1159
1160 if (!use_misc) {
1161 iov = &cmd->iov_data[0];
1162 iov_count = cmd->iov_data_count;
1163 } else {
1164 iov = &cmd->iov_misc[0];
1165 iov_count = cmd->iov_misc_count;
1166 }
1167
1168 tx_sent = tx_data(conn, &iov[0], iov_count, tx_size);
1169 if (tx_size != tx_sent) {
1170 if (tx_sent == -EAGAIN) {
1171 pr_err("tx_data() returned -EAGAIN\n");
1172 goto send_data;
1173 } else
1174 return -1;
1175 }
1176 cmd->tx_size = 0;
1177
1178 return 0;
1179 }
1180
1181 int iscsit_fe_sendpage_sg(
1182 struct iscsi_cmd *cmd,
1183 struct iscsi_conn *conn)
1184 {
1185 struct scatterlist *sg = cmd->first_data_sg;
1186 struct kvec iov;
1187 u32 tx_hdr_size, data_len;
1188 u32 offset = cmd->first_data_sg_off;
1189 int tx_sent, iov_off;
1190
1191 send_hdr:
1192 tx_hdr_size = ISCSI_HDR_LEN;
1193 if (conn->conn_ops->HeaderDigest)
1194 tx_hdr_size += ISCSI_CRC_LEN;
1195
1196 iov.iov_base = cmd->pdu;
1197 iov.iov_len = tx_hdr_size;
1198
1199 tx_sent = tx_data(conn, &iov, 1, tx_hdr_size);
1200 if (tx_hdr_size != tx_sent) {
1201 if (tx_sent == -EAGAIN) {
1202 pr_err("tx_data() returned -EAGAIN\n");
1203 goto send_hdr;
1204 }
1205 return -1;
1206 }
1207
1208 data_len = cmd->tx_size - tx_hdr_size - cmd->padding;
1209 /*
1210 * Set iov_off used by padding and data digest tx_data() calls below
1211 * in order to determine proper offset into cmd->iov_data[]
1212 */
1213 if (conn->conn_ops->DataDigest) {
1214 data_len -= ISCSI_CRC_LEN;
1215 if (cmd->padding)
1216 iov_off = (cmd->iov_data_count - 2);
1217 else
1218 iov_off = (cmd->iov_data_count - 1);
1219 } else {
1220 iov_off = (cmd->iov_data_count - 1);
1221 }
1222 /*
1223 * Perform sendpage() for each page in the scatterlist
1224 */
1225 while (data_len) {
1226 u32 space = (sg->length - offset);
1227 u32 sub_len = min_t(u32, data_len, space);
1228 send_pg:
1229 tx_sent = conn->sock->ops->sendpage(conn->sock,
1230 sg_page(sg), sg->offset + offset, sub_len, 0);
1231 if (tx_sent != sub_len) {
1232 if (tx_sent == -EAGAIN) {
1233 pr_err("tcp_sendpage() returned"
1234 " -EAGAIN\n");
1235 goto send_pg;
1236 }
1237
1238 pr_err("tcp_sendpage() failure: %d\n",
1239 tx_sent);
1240 return -1;
1241 }
1242
1243 data_len -= sub_len;
1244 offset = 0;
1245 sg = sg_next(sg);
1246 }
1247
1248 send_padding:
1249 if (cmd->padding) {
1250 struct kvec *iov_p = &cmd->iov_data[iov_off++];
1251
1252 tx_sent = tx_data(conn, iov_p, 1, cmd->padding);
1253 if (cmd->padding != tx_sent) {
1254 if (tx_sent == -EAGAIN) {
1255 pr_err("tx_data() returned -EAGAIN\n");
1256 goto send_padding;
1257 }
1258 return -1;
1259 }
1260 }
1261
1262 send_datacrc:
1263 if (conn->conn_ops->DataDigest) {
1264 struct kvec *iov_d = &cmd->iov_data[iov_off];
1265
1266 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN);
1267 if (ISCSI_CRC_LEN != tx_sent) {
1268 if (tx_sent == -EAGAIN) {
1269 pr_err("tx_data() returned -EAGAIN\n");
1270 goto send_datacrc;
1271 }
1272 return -1;
1273 }
1274 }
1275
1276 return 0;
1277 }
1278
1279 /*
1280 * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU
1281 * back to the Initiator when an expection condition occurs with the
1282 * errors set in status_class and status_detail.
1283 *
1284 * Parameters: iSCSI Connection, Status Class, Status Detail.
1285 * Returns: 0 on success, -1 on error.
1286 */
1287 int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail)
1288 {
1289 struct iscsi_login_rsp *hdr;
1290 struct iscsi_login *login = conn->conn_login;
1291
1292 login->login_failed = 1;
1293 iscsit_collect_login_stats(conn, status_class, status_detail);
1294
1295 hdr = (struct iscsi_login_rsp *)&login->rsp[0];
1296 hdr->opcode = ISCSI_OP_LOGIN_RSP;
1297 hdr->status_class = status_class;
1298 hdr->status_detail = status_detail;
1299 hdr->itt = conn->login_itt;
1300
1301 return conn->conn_transport->iscsit_put_login_tx(conn, login, 0);
1302 }
1303
1304 void iscsit_print_session_params(struct iscsi_session *sess)
1305 {
1306 struct iscsi_conn *conn;
1307
1308 pr_debug("-----------------------------[Session Params for"
1309 " SID: %u]-----------------------------\n", sess->sid);
1310 spin_lock_bh(&sess->conn_lock);
1311 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
1312 iscsi_dump_conn_ops(conn->conn_ops);
1313 spin_unlock_bh(&sess->conn_lock);
1314
1315 iscsi_dump_sess_ops(sess->sess_ops);
1316 }
1317
1318 static int iscsit_do_rx_data(
1319 struct iscsi_conn *conn,
1320 struct iscsi_data_count *count)
1321 {
1322 int data = count->data_length, rx_loop = 0, total_rx = 0, iov_len;
1323 struct kvec *iov_p;
1324 struct msghdr msg;
1325
1326 if (!conn || !conn->sock || !conn->conn_ops)
1327 return -1;
1328
1329 memset(&msg, 0, sizeof(struct msghdr));
1330
1331 iov_p = count->iov;
1332 iov_len = count->iov_count;
1333
1334 while (total_rx < data) {
1335 rx_loop = kernel_recvmsg(conn->sock, &msg, iov_p, iov_len,
1336 (data - total_rx), MSG_WAITALL);
1337 if (rx_loop <= 0) {
1338 pr_debug("rx_loop: %d total_rx: %d\n",
1339 rx_loop, total_rx);
1340 return rx_loop;
1341 }
1342 total_rx += rx_loop;
1343 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n",
1344 rx_loop, total_rx, data);
1345 }
1346
1347 return total_rx;
1348 }
1349
1350 static int iscsit_do_tx_data(
1351 struct iscsi_conn *conn,
1352 struct iscsi_data_count *count)
1353 {
1354 int data = count->data_length, total_tx = 0, tx_loop = 0, iov_len;
1355 struct kvec *iov_p;
1356 struct msghdr msg;
1357
1358 if (!conn || !conn->sock || !conn->conn_ops)
1359 return -1;
1360
1361 if (data <= 0) {
1362 pr_err("Data length is: %d\n", data);
1363 return -1;
1364 }
1365
1366 memset(&msg, 0, sizeof(struct msghdr));
1367
1368 iov_p = count->iov;
1369 iov_len = count->iov_count;
1370
1371 while (total_tx < data) {
1372 tx_loop = kernel_sendmsg(conn->sock, &msg, iov_p, iov_len,
1373 (data - total_tx));
1374 if (tx_loop <= 0) {
1375 pr_debug("tx_loop: %d total_tx %d\n",
1376 tx_loop, total_tx);
1377 return tx_loop;
1378 }
1379 total_tx += tx_loop;
1380 pr_debug("tx_loop: %d, total_tx: %d, data: %d\n",
1381 tx_loop, total_tx, data);
1382 }
1383
1384 return total_tx;
1385 }
1386
1387 int rx_data(
1388 struct iscsi_conn *conn,
1389 struct kvec *iov,
1390 int iov_count,
1391 int data)
1392 {
1393 struct iscsi_data_count c;
1394
1395 if (!conn || !conn->sock || !conn->conn_ops)
1396 return -1;
1397
1398 memset(&c, 0, sizeof(struct iscsi_data_count));
1399 c.iov = iov;
1400 c.iov_count = iov_count;
1401 c.data_length = data;
1402 c.type = ISCSI_RX_DATA;
1403
1404 return iscsit_do_rx_data(conn, &c);
1405 }
1406
1407 int tx_data(
1408 struct iscsi_conn *conn,
1409 struct kvec *iov,
1410 int iov_count,
1411 int data)
1412 {
1413 struct iscsi_data_count c;
1414
1415 if (!conn || !conn->sock || !conn->conn_ops)
1416 return -1;
1417
1418 memset(&c, 0, sizeof(struct iscsi_data_count));
1419 c.iov = iov;
1420 c.iov_count = iov_count;
1421 c.data_length = data;
1422 c.type = ISCSI_TX_DATA;
1423
1424 return iscsit_do_tx_data(conn, &c);
1425 }
1426
1427 void iscsit_collect_login_stats(
1428 struct iscsi_conn *conn,
1429 u8 status_class,
1430 u8 status_detail)
1431 {
1432 struct iscsi_param *intrname = NULL;
1433 struct iscsi_tiqn *tiqn;
1434 struct iscsi_login_stats *ls;
1435
1436 tiqn = iscsit_snmp_get_tiqn(conn);
1437 if (!tiqn)
1438 return;
1439
1440 ls = &tiqn->login_stats;
1441
1442 spin_lock(&ls->lock);
1443 if (!strcmp(conn->login_ip, ls->last_intr_fail_ip_addr) &&
1444 ((get_jiffies_64() - ls->last_fail_time) < 10)) {
1445 /* We already have the failure info for this login */
1446 spin_unlock(&ls->lock);
1447 return;
1448 }
1449
1450 if (status_class == ISCSI_STATUS_CLS_SUCCESS)
1451 ls->accepts++;
1452 else if (status_class == ISCSI_STATUS_CLS_REDIRECT) {
1453 ls->redirects++;
1454 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT;
1455 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1456 (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) {
1457 ls->authenticate_fails++;
1458 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE;
1459 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1460 (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) {
1461 ls->authorize_fails++;
1462 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE;
1463 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1464 (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) {
1465 ls->negotiate_fails++;
1466 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE;
1467 } else {
1468 ls->other_fails++;
1469 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER;
1470 }
1471
1472 /* Save initiator name, ip address and time, if it is a failed login */
1473 if (status_class != ISCSI_STATUS_CLS_SUCCESS) {
1474 if (conn->param_list)
1475 intrname = iscsi_find_param_from_key(INITIATORNAME,
1476 conn->param_list);
1477 strcpy(ls->last_intr_fail_name,
1478 (intrname ? intrname->value : "Unknown"));
1479
1480 ls->last_intr_fail_ip_family = conn->login_family;
1481
1482 snprintf(ls->last_intr_fail_ip_addr, IPV6_ADDRESS_SPACE,
1483 "%s", conn->login_ip);
1484 ls->last_fail_time = get_jiffies_64();
1485 }
1486
1487 spin_unlock(&ls->lock);
1488 }
1489
1490 struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn)
1491 {
1492 struct iscsi_portal_group *tpg;
1493
1494 if (!conn || !conn->sess)
1495 return NULL;
1496
1497 tpg = conn->sess->tpg;
1498 if (!tpg)
1499 return NULL;
1500
1501 if (!tpg->tpg_tiqn)
1502 return NULL;
1503
1504 return tpg->tpg_tiqn;
1505 }
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