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[mirror_ubuntu-artful-kernel.git] / drivers / target / iscsi / iscsi_target_util.c
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e48354ce
NB		 1/*******************************************************************************
2 * This file contains the iSCSI Target specific utility functions.
3 *
4c76251e 4 * (c) Copyright 2007-2013 Datera, Inc.
e48354ce
NB		 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>
988e3a85 20#include <linux/percpu_ida.h>
e48354ce
NB		 21#include <scsi/scsi_tcq.h>
22#include <scsi/iscsi_proto.h>
23#include <target/target_core_base.h>
c4795fb2 24#include <target/target_core_fabric.h>
baa4d64b 25#include <target/iscsi/iscsi_transport.h>
e48354ce 26
67f091f2 27#include <target/iscsi/iscsi_target_core.h>
e48354ce
NB		 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"
e48354ce
NB		 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
55extern struct list_head g_tiqn_list;
56extern spinlock_t tiqn_lock;
57
58/*
59 * Called with cmd->r2t_lock held.
60 */
61int 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
90struct 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
112struct 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 */
133void 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
139void 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 */
676687c6 153struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *conn, int state)
e48354ce
NB		 154{
155 struct iscsi_cmd *cmd;
988e3a85 156 struct se_session *se_sess = conn->sess->se_sess;
676687c6 157 int size, tag;
6f6b5d1e
KO		 158
159 tag = percpu_ida_alloc(&se_sess->sess_tag_pool, state);
160 if (tag < 0)
161 return NULL;
e48354ce 162
988e3a85
NB		 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;
cdb72665 168 cmd->conn = conn;
2fbb471e 169 INIT_LIST_HEAD(&cmd->i_conn_node);
e48354ce
NB		 170 INIT_LIST_HEAD(&cmd->datain_list);
171 INIT_LIST_HEAD(&cmd->cmd_r2t_list);
e48354ce
NB		 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}
cdb72665 180EXPORT_SYMBOL(iscsit_allocate_cmd);
e48354ce 181
e48354ce
NB		 182struct 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
195struct 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
216struct 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
234static inline int iscsit_check_received_cmdsn(struct iscsi_session *sess, u32 cmdsn)
235{
109e2381 236 u32 max_cmdsn;
e48354ce
NB		 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 */
109e2381
RD		 245 max_cmdsn = atomic_read(&sess->max_cmd_sn);
246 if (iscsi_sna_gt(cmdsn, max_cmdsn)) {
e48354ce 247 pr_err("Received CmdSN: 0x%08x is greater than"
109e2381 248 " MaxCmdSN: 0x%08x, ignoring.\n", cmdsn, max_cmdsn);
ea7e32be 249 ret = CMDSN_MAXCMDSN_OVERRUN;
e48354ce
NB		 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 */
561bf158
NB		 278int iscsit_sequence_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
279 unsigned char *buf, __be32 cmdsn)
e48354ce 280{
561bf158
NB		 281 int ret, cmdsn_ret;
282 bool reject = false;
283 u8 reason = ISCSI_REASON_BOOKMARK_NO_RESOURCES;
e48354ce
NB		 284
285 mutex_lock(&conn->sess->cmdsn_mutex);
286
50e5c87d 287 cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, be32_to_cpu(cmdsn));
e48354ce
NB		 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);
561bf158
NB		 293 else if (ret < 0) {
294 reject = true;
295 ret = CMDSN_ERROR_CANNOT_RECOVER;
296 }
e48354ce
NB		 297 break;
298 case CMDSN_HIGHER_THAN_EXP:
50e5c87d 299 ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, be32_to_cpu(cmdsn));
561bf158
NB		 300 if (ret < 0) {
301 reject = true;
302 ret = CMDSN_ERROR_CANNOT_RECOVER;
303 break;
304 }
305 ret = CMDSN_HIGHER_THAN_EXP;
e48354ce
NB		 306 break;
307 case CMDSN_LOWER_THAN_EXP:
ea7e32be
NB		 308 case CMDSN_MAXCMDSN_OVERRUN:
309 default:
e48354ce
NB		 310 cmd->i_state = ISTATE_REMOVE;
311 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
ea7e32be
NB		 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;
e48354ce
NB		 318 break;
319 }
320 mutex_unlock(&conn->sess->cmdsn_mutex);
321
561bf158
NB		 322 if (reject)
323 iscsit_reject_cmd(cmd, reason, buf);
324
e48354ce
NB		 325 return ret;
326}
3e1c81a9 327EXPORT_SYMBOL(iscsit_sequence_cmd);
e48354ce
NB		 328
329int 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
ebf1d95c 358 if (((cmd->first_burst_len + payload_length) != cmd->se_cmd.data_length) &&
e48354ce
NB		 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),
ebf1d95c 365 conn->sess->sess_ops->FirstBurstLength, cmd->se_cmd.data_length);
e48354ce
NB		 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
373struct iscsi_cmd *iscsit_find_cmd_from_itt(
374 struct iscsi_conn *conn,
66c7db68 375 itt_t init_task_tag)
e48354ce
NB		 376{
377 struct iscsi_cmd *cmd;
378
379 spin_lock_bh(&conn->cmd_lock);
2fbb471e 380 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
e48354ce
NB		 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}
e4f4e801 392EXPORT_SYMBOL(iscsit_find_cmd_from_itt);
e48354ce
NB		 393
394struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump(
395 struct iscsi_conn *conn,
66c7db68 396 itt_t init_task_tag,
e48354ce
NB		 397 u32 length)
398{
399 struct iscsi_cmd *cmd;
400
401 spin_lock_bh(&conn->cmd_lock);
2fbb471e 402 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
3687db88
NB		 403 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT)
404 continue;
e48354ce
NB		 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
420struct 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);
2fbb471e 427 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
e48354ce
NB		 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
440int iscsit_find_cmd_for_recovery(
441 struct iscsi_session *sess,
442 struct iscsi_cmd **cmd_ptr,
443 struct iscsi_conn_recovery **cr_ptr,
66c7db68 444 itt_t init_task_tag)
e48354ce
NB		 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);
2fbb471e 455 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
e48354ce
NB		 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);
2fbb471e 475 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
e48354ce
NB		 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
492void 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
d5627acb 515 wake_up(&conn->queues_wq);
e48354ce
NB		 516}
517
518struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *conn)
519{
520 struct iscsi_queue_req *qr;
521
522 spin_lock_bh(&conn->immed_queue_lock);
523 if (list_empty(&conn->immed_queue_list)) {
524 spin_unlock_bh(&conn->immed_queue_lock);
525 return NULL;
526 }
1f981de5
RD		 527 qr = list_first_entry(&conn->immed_queue_list,
528 struct iscsi_queue_req, qr_list);
e48354ce
NB		 529
530 list_del(&qr->qr_list);
531 if (qr->cmd)
532 atomic_dec(&qr->cmd->immed_queue_count);
533 spin_unlock_bh(&conn->immed_queue_lock);
534
535 return qr;
536}
537
538static void iscsit_remove_cmd_from_immediate_queue(
539 struct iscsi_cmd *cmd,
540 struct iscsi_conn *conn)
541{
542 struct iscsi_queue_req *qr, *qr_tmp;
543
544 spin_lock_bh(&conn->immed_queue_lock);
545 if (!atomic_read(&cmd->immed_queue_count)) {
546 spin_unlock_bh(&conn->immed_queue_lock);
547 return;
548 }
549
550 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
551 if (qr->cmd != cmd)
552 continue;
553
554 atomic_dec(&qr->cmd->immed_queue_count);
555 list_del(&qr->qr_list);
556 kmem_cache_free(lio_qr_cache, qr);
557 }
558 spin_unlock_bh(&conn->immed_queue_lock);
559
560 if (atomic_read(&cmd->immed_queue_count)) {
561 pr_err("ITT: 0x%08x immed_queue_count: %d\n",
562 cmd->init_task_tag,
563 atomic_read(&cmd->immed_queue_count));
564 }
565}
566
567void iscsit_add_cmd_to_response_queue(
568 struct iscsi_cmd *cmd,
569 struct iscsi_conn *conn,
570 u8 state)
571{
572 struct iscsi_queue_req *qr;
573
574 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
575 if (!qr) {
576 pr_err("Unable to allocate memory for"
577 " struct iscsi_queue_req\n");
578 return;
579 }
580 INIT_LIST_HEAD(&qr->qr_list);
581 qr->cmd = cmd;
582 qr->state = state;
583
584 spin_lock_bh(&conn->response_queue_lock);
585 list_add_tail(&qr->qr_list, &conn->response_queue_list);
586 atomic_inc(&cmd->response_queue_count);
587 spin_unlock_bh(&conn->response_queue_lock);
588
d5627acb 589 wake_up(&conn->queues_wq);
e48354ce
NB		 590}
591
592struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *conn)
593{
594 struct iscsi_queue_req *qr;
595
596 spin_lock_bh(&conn->response_queue_lock);
597 if (list_empty(&conn->response_queue_list)) {
598 spin_unlock_bh(&conn->response_queue_lock);
599 return NULL;
600 }
601
1f981de5
RD		 602 qr = list_first_entry(&conn->response_queue_list,
603 struct iscsi_queue_req, qr_list);
e48354ce
NB		 604
605 list_del(&qr->qr_list);
606 if (qr->cmd)
607 atomic_dec(&qr->cmd->response_queue_count);
608 spin_unlock_bh(&conn->response_queue_lock);
609
610 return qr;
611}
612
613static void iscsit_remove_cmd_from_response_queue(
614 struct iscsi_cmd *cmd,
615 struct iscsi_conn *conn)
616{
617 struct iscsi_queue_req *qr, *qr_tmp;
618
619 spin_lock_bh(&conn->response_queue_lock);
620 if (!atomic_read(&cmd->response_queue_count)) {
621 spin_unlock_bh(&conn->response_queue_lock);
622 return;
623 }
624
625 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
626 qr_list) {
627 if (qr->cmd != cmd)
628 continue;
629
630 atomic_dec(&qr->cmd->response_queue_count);
631 list_del(&qr->qr_list);
632 kmem_cache_free(lio_qr_cache, qr);
633 }
634 spin_unlock_bh(&conn->response_queue_lock);
635
636 if (atomic_read(&cmd->response_queue_count)) {
637 pr_err("ITT: 0x%08x response_queue_count: %d\n",
638 cmd->init_task_tag,
639 atomic_read(&cmd->response_queue_count));
640 }
641}
642
d5627acb
RD		 643bool iscsit_conn_all_queues_empty(struct iscsi_conn *conn)
644{
645 bool empty;
646
647 spin_lock_bh(&conn->immed_queue_lock);
648 empty = list_empty(&conn->immed_queue_list);
649 spin_unlock_bh(&conn->immed_queue_lock);
650
651 if (!empty)
652 return empty;
653
654 spin_lock_bh(&conn->response_queue_lock);
655 empty = list_empty(&conn->response_queue_list);
656 spin_unlock_bh(&conn->response_queue_lock);
657
658 return empty;
659}
660
e48354ce
NB		 661void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn)
662{
663 struct iscsi_queue_req *qr, *qr_tmp;
664
665 spin_lock_bh(&conn->immed_queue_lock);
666 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
667 list_del(&qr->qr_list);
668 if (qr->cmd)
669 atomic_dec(&qr->cmd->immed_queue_count);
670
671 kmem_cache_free(lio_qr_cache, qr);
672 }
673 spin_unlock_bh(&conn->immed_queue_lock);
674
675 spin_lock_bh(&conn->response_queue_lock);
676 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
677 qr_list) {
678 list_del(&qr->qr_list);
679 if (qr->cmd)
680 atomic_dec(&qr->cmd->response_queue_count);
681
682 kmem_cache_free(lio_qr_cache, qr);
683 }
684 spin_unlock_bh(&conn->response_queue_lock);
685}
686
687void iscsit_release_cmd(struct iscsi_cmd *cmd)
688{
988e3a85
NB		 689 struct iscsi_session *sess;
690 struct se_cmd *se_cmd = &cmd->se_cmd;
691
692 if (cmd->conn)
693 sess = cmd->conn->sess;
694 else
695 sess = cmd->sess;
696
697 BUG_ON(!sess || !sess->se_sess);
698
e48354ce
NB		 699 kfree(cmd->buf_ptr);
700 kfree(cmd->pdu_list);
701 kfree(cmd->seq_list);
702 kfree(cmd->tmr_req);
703 kfree(cmd->iov_data);
9864ca9d 704 kfree(cmd->text_in_ptr);
e48354ce 705
988e3a85 706 percpu_ida_free(&sess->se_sess->sess_tag_pool, se_cmd->map_tag);
aafc9d15 707}
d703ce2f 708EXPORT_SYMBOL(iscsit_release_cmd);
aafc9d15 709
131e6abc
NB		 710void __iscsit_free_cmd(struct iscsi_cmd *cmd, bool scsi_cmd,
711 bool check_queues)
aafc9d15
NB		 712{
713 struct iscsi_conn *conn = cmd->conn;
714
715 if (scsi_cmd) {
716 if (cmd->data_direction == DMA_TO_DEVICE) {
717 iscsit_stop_dataout_timer(cmd);
718 iscsit_free_r2ts_from_list(cmd);
719 }
720 if (cmd->data_direction == DMA_FROM_DEVICE)
721 iscsit_free_all_datain_reqs(cmd);
722 }
723
724 if (conn && check_queues) {
e48354ce
NB		 725 iscsit_remove_cmd_from_immediate_queue(cmd, conn);
726 iscsit_remove_cmd_from_response_queue(cmd, conn);
727 }
e48354ce
NB		 728}
729
aafc9d15 730void iscsit_free_cmd(struct iscsi_cmd *cmd, bool shutdown)
d270190a 731{
aafc9d15
NB		 732 struct se_cmd *se_cmd = NULL;
733 int rc;
d270190a 734 /*
20879696 735 * Determine if a struct se_cmd is associated with
d270190a
NB		 736 * this struct iscsi_cmd.
737 */
738 switch (cmd->iscsi_opcode) {
739 case ISCSI_OP_SCSI_CMD:
aafc9d15
NB		 740 se_cmd = &cmd->se_cmd;
741 __iscsit_free_cmd(cmd, true, shutdown);
cdb72665
NB		 742 /*
743 * Fallthrough
744 */
d270190a 745 case ISCSI_OP_SCSI_TMFUNC:
e255a285 746 rc = transport_generic_free_cmd(&cmd->se_cmd, shutdown);
aafc9d15
NB		 747 if (!rc && shutdown && se_cmd && se_cmd->se_sess) {
748 __iscsit_free_cmd(cmd, true, shutdown);
afc16604 749 target_put_sess_cmd(se_cmd);
aafc9d15 750 }
d270190a 751 break;
c1ce4bd5
NB		 752 case ISCSI_OP_REJECT:
753 /*
754 * Handle special case for REJECT when iscsi_add_reject*() has
755 * overwritten the original iscsi_opcode assignment, and the
756 * associated cmd->se_cmd needs to be released.
757 */
758 if (cmd->se_cmd.se_tfo != NULL) {
aafc9d15
NB		 759 se_cmd = &cmd->se_cmd;
760 __iscsit_free_cmd(cmd, true, shutdown);
761
e255a285 762 rc = transport_generic_free_cmd(&cmd->se_cmd, shutdown);
aafc9d15
NB		 763 if (!rc && shutdown && se_cmd->se_sess) {
764 __iscsit_free_cmd(cmd, true, shutdown);
afc16604 765 target_put_sess_cmd(se_cmd);
aafc9d15 766 }
c1ce4bd5
NB		 767 break;
768 }
769 /* Fall-through */
d270190a 770 default:
aafc9d15 771 __iscsit_free_cmd(cmd, false, shutdown);
d703ce2f 772 iscsit_release_cmd(cmd);
d270190a
NB		 773 break;
774 }
775}
776
e48354ce
NB		 777int iscsit_check_session_usage_count(struct iscsi_session *sess)
778{
779 spin_lock_bh(&sess->session_usage_lock);
780 if (sess->session_usage_count != 0) {
781 sess->session_waiting_on_uc = 1;
782 spin_unlock_bh(&sess->session_usage_lock);
783 if (in_interrupt())
784 return 2;
785
786 wait_for_completion(&sess->session_waiting_on_uc_comp);
787 return 1;
788 }
789 spin_unlock_bh(&sess->session_usage_lock);
790
791 return 0;
792}
793
794void iscsit_dec_session_usage_count(struct iscsi_session *sess)
795{
796 spin_lock_bh(&sess->session_usage_lock);
797 sess->session_usage_count--;
798
799 if (!sess->session_usage_count && sess->session_waiting_on_uc)
800 complete(&sess->session_waiting_on_uc_comp);
801
802 spin_unlock_bh(&sess->session_usage_lock);
803}
804
805void iscsit_inc_session_usage_count(struct iscsi_session *sess)
806{
807 spin_lock_bh(&sess->session_usage_lock);
808 sess->session_usage_count++;
809 spin_unlock_bh(&sess->session_usage_lock);
810}
811
e48354ce
NB		 812struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid)
813{
814 struct iscsi_conn *conn;
815
816 spin_lock_bh(&sess->conn_lock);
817 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
818 if ((conn->cid == cid) &&
819 (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) {
820 iscsit_inc_conn_usage_count(conn);
821 spin_unlock_bh(&sess->conn_lock);
822 return conn;
823 }
824 }
825 spin_unlock_bh(&sess->conn_lock);
826
827 return NULL;
828}
829
830struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid)
831{
832 struct iscsi_conn *conn;
833
834 spin_lock_bh(&sess->conn_lock);
835 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
836 if (conn->cid == cid) {
837 iscsit_inc_conn_usage_count(conn);
838 spin_lock(&conn->state_lock);
839 atomic_set(&conn->connection_wait_rcfr, 1);
840 spin_unlock(&conn->state_lock);
841 spin_unlock_bh(&sess->conn_lock);
842 return conn;
843 }
844 }
845 spin_unlock_bh(&sess->conn_lock);
846
847 return NULL;
848}
849
850void iscsit_check_conn_usage_count(struct iscsi_conn *conn)
851{
852 spin_lock_bh(&conn->conn_usage_lock);
853 if (conn->conn_usage_count != 0) {
854 conn->conn_waiting_on_uc = 1;
855 spin_unlock_bh(&conn->conn_usage_lock);
856
857 wait_for_completion(&conn->conn_waiting_on_uc_comp);
858 return;
859 }
860 spin_unlock_bh(&conn->conn_usage_lock);
861}
862
863void iscsit_dec_conn_usage_count(struct iscsi_conn *conn)
864{
865 spin_lock_bh(&conn->conn_usage_lock);
866 conn->conn_usage_count--;
867
868 if (!conn->conn_usage_count && conn->conn_waiting_on_uc)
869 complete(&conn->conn_waiting_on_uc_comp);
870
871 spin_unlock_bh(&conn->conn_usage_lock);
872}
873
874void iscsit_inc_conn_usage_count(struct iscsi_conn *conn)
875{
876 spin_lock_bh(&conn->conn_usage_lock);
877 conn->conn_usage_count++;
878 spin_unlock_bh(&conn->conn_usage_lock);
879}
880
881static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response)
882{
883 u8 state;
884 struct iscsi_cmd *cmd;
885
676687c6 886 cmd = iscsit_allocate_cmd(conn, TASK_RUNNING);
e48354ce
NB		 887 if (!cmd)
888 return -1;
889
890 cmd->iscsi_opcode = ISCSI_OP_NOOP_IN;
891 state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE :
892 ISTATE_SEND_NOPIN_NO_RESPONSE;
66c7db68 893 cmd->init_task_tag = RESERVED_ITT;
c1e34b64
SG		 894 cmd->targ_xfer_tag = (want_response) ?
895 session_get_next_ttt(conn->sess) : 0xFFFFFFFF;
e48354ce 896 spin_lock_bh(&conn->cmd_lock);
2fbb471e 897 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 898 spin_unlock_bh(&conn->cmd_lock);
899
900 if (want_response)
901 iscsit_start_nopin_response_timer(conn);
902 iscsit_add_cmd_to_immediate_queue(cmd, conn, state);
903
904 return 0;
905}
906
907static void iscsit_handle_nopin_response_timeout(unsigned long data)
908{
909 struct iscsi_conn *conn = (struct iscsi_conn *) data;
910
911 iscsit_inc_conn_usage_count(conn);
912
913 spin_lock_bh(&conn->nopin_timer_lock);
914 if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) {
915 spin_unlock_bh(&conn->nopin_timer_lock);
916 iscsit_dec_conn_usage_count(conn);
917 return;
918 }
919
920 pr_debug("Did not receive response to NOPIN on CID: %hu on"
921 " SID: %u, failing connection.\n", conn->cid,
922 conn->sess->sid);
923 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
924 spin_unlock_bh(&conn->nopin_timer_lock);
925
926 {
927 struct iscsi_portal_group *tpg = conn->sess->tpg;
928 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
929
930 if (tiqn) {
931 spin_lock_bh(&tiqn->sess_err_stats.lock);
932 strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
8359cf43 933 conn->sess->sess_ops->InitiatorName);
e48354ce
NB		 934 tiqn->sess_err_stats.last_sess_failure_type =
935 ISCSI_SESS_ERR_CXN_TIMEOUT;
936 tiqn->sess_err_stats.cxn_timeout_errors++;
04f3b31b 937 atomic_long_inc(&conn->sess->conn_timeout_errors);
e48354ce
NB		 938 spin_unlock_bh(&tiqn->sess_err_stats.lock);
939 }
940 }
941
942 iscsit_cause_connection_reinstatement(conn, 0);
943 iscsit_dec_conn_usage_count(conn);
944}
945
946void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn)
947{
948 struct iscsi_session *sess = conn->sess;
949 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
950
951 spin_lock_bh(&conn->nopin_timer_lock);
952 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
953 spin_unlock_bh(&conn->nopin_timer_lock);
954 return;
955 }
956
957 mod_timer(&conn->nopin_response_timer,
958 (get_jiffies_64() + na->nopin_response_timeout * HZ));
959 spin_unlock_bh(&conn->nopin_timer_lock);
960}
961
962/*
963 * Called with conn->nopin_timer_lock held.
964 */
965void iscsit_start_nopin_response_timer(struct iscsi_conn *conn)
966{
967 struct iscsi_session *sess = conn->sess;
968 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
969
970 spin_lock_bh(&conn->nopin_timer_lock);
971 if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) {
972 spin_unlock_bh(&conn->nopin_timer_lock);
973 return;
974 }
975
976 init_timer(&conn->nopin_response_timer);
977 conn->nopin_response_timer.expires =
978 (get_jiffies_64() + na->nopin_response_timeout * HZ);
979 conn->nopin_response_timer.data = (unsigned long)conn;
980 conn->nopin_response_timer.function = iscsit_handle_nopin_response_timeout;
981 conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP;
982 conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING;
983 add_timer(&conn->nopin_response_timer);
984
985 pr_debug("Started NOPIN Response Timer on CID: %d to %u"
986 " seconds\n", conn->cid, na->nopin_response_timeout);
987 spin_unlock_bh(&conn->nopin_timer_lock);
988}
989
990void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn)
991{
992 spin_lock_bh(&conn->nopin_timer_lock);
993 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
994 spin_unlock_bh(&conn->nopin_timer_lock);
995 return;
996 }
997 conn->nopin_response_timer_flags |= ISCSI_TF_STOP;
998 spin_unlock_bh(&conn->nopin_timer_lock);
999
1000 del_timer_sync(&conn->nopin_response_timer);
1001
1002 spin_lock_bh(&conn->nopin_timer_lock);
1003 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
1004 spin_unlock_bh(&conn->nopin_timer_lock);
1005}
1006
1007static void iscsit_handle_nopin_timeout(unsigned long data)
1008{
1009 struct iscsi_conn *conn = (struct iscsi_conn *) data;
1010
1011 iscsit_inc_conn_usage_count(conn);
1012
1013 spin_lock_bh(&conn->nopin_timer_lock);
1014 if (conn->nopin_timer_flags & ISCSI_TF_STOP) {
1015 spin_unlock_bh(&conn->nopin_timer_lock);
1016 iscsit_dec_conn_usage_count(conn);
1017 return;
1018 }
1019 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1020 spin_unlock_bh(&conn->nopin_timer_lock);
1021
1022 iscsit_add_nopin(conn, 1);
1023 iscsit_dec_conn_usage_count(conn);
1024}
1025
1026/*
1027 * Called with conn->nopin_timer_lock held.
1028 */
1029void __iscsit_start_nopin_timer(struct iscsi_conn *conn)
1030{
1031 struct iscsi_session *sess = conn->sess;
1032 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1033 /*
1034 * NOPIN timeout is disabled.
1035 */
1036 if (!na->nopin_timeout)
1037 return;
1038
1039 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING)
1040 return;
1041
1042 init_timer(&conn->nopin_timer);
1043 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1044 conn->nopin_timer.data = (unsigned long)conn;
1045 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1046 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1047 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1048 add_timer(&conn->nopin_timer);
1049
1050 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1051 " interval\n", conn->cid, na->nopin_timeout);
1052}
1053
1054void iscsit_start_nopin_timer(struct iscsi_conn *conn)
1055{
1056 struct iscsi_session *sess = conn->sess;
1057 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1058 /*
1059 * NOPIN timeout is disabled..
1060 */
1061 if (!na->nopin_timeout)
1062 return;
1063
1064 spin_lock_bh(&conn->nopin_timer_lock);
1065 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) {
1066 spin_unlock_bh(&conn->nopin_timer_lock);
1067 return;
1068 }
1069
1070 init_timer(&conn->nopin_timer);
1071 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1072 conn->nopin_timer.data = (unsigned long)conn;
1073 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1074 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1075 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1076 add_timer(&conn->nopin_timer);
1077
1078 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1079 " interval\n", conn->cid, na->nopin_timeout);
1080 spin_unlock_bh(&conn->nopin_timer_lock);
1081}
1082
1083void iscsit_stop_nopin_timer(struct iscsi_conn *conn)
1084{
1085 spin_lock_bh(&conn->nopin_timer_lock);
1086 if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) {
1087 spin_unlock_bh(&conn->nopin_timer_lock);
1088 return;
1089 }
1090 conn->nopin_timer_flags |= ISCSI_TF_STOP;
1091 spin_unlock_bh(&conn->nopin_timer_lock);
1092
1093 del_timer_sync(&conn->nopin_timer);
1094
1095 spin_lock_bh(&conn->nopin_timer_lock);
1096 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1097 spin_unlock_bh(&conn->nopin_timer_lock);
1098}
1099
1100int iscsit_send_tx_data(
1101 struct iscsi_cmd *cmd,
1102 struct iscsi_conn *conn,
1103 int use_misc)
1104{
1105 int tx_sent, tx_size;
1106 u32 iov_count;
1107 struct kvec *iov;
1108
1109send_data:
1110 tx_size = cmd->tx_size;
1111
1112 if (!use_misc) {
1113 iov = &cmd->iov_data[0];
1114 iov_count = cmd->iov_data_count;
1115 } else {
1116 iov = &cmd->iov_misc[0];
1117 iov_count = cmd->iov_misc_count;
1118 }
1119
1120 tx_sent = tx_data(conn, &iov[0], iov_count, tx_size);
1121 if (tx_size != tx_sent) {
1122 if (tx_sent == -EAGAIN) {
1123 pr_err("tx_data() returned -EAGAIN\n");
1124 goto send_data;
1125 } else
1126 return -1;
1127 }
1128 cmd->tx_size = 0;
1129
1130 return 0;
1131}
1132
1133int iscsit_fe_sendpage_sg(
1134 struct iscsi_cmd *cmd,
1135 struct iscsi_conn *conn)
1136{
1137 struct scatterlist *sg = cmd->first_data_sg;
1138 struct kvec iov;
1139 u32 tx_hdr_size, data_len;
1140 u32 offset = cmd->first_data_sg_off;
40b05497 1141 int tx_sent, iov_off;
e48354ce
NB		 1142
1143send_hdr:
1144 tx_hdr_size = ISCSI_HDR_LEN;
1145 if (conn->conn_ops->HeaderDigest)
1146 tx_hdr_size += ISCSI_CRC_LEN;
1147
1148 iov.iov_base = cmd->pdu;
1149 iov.iov_len = tx_hdr_size;
1150
1151 tx_sent = tx_data(conn, &iov, 1, tx_hdr_size);
1152 if (tx_hdr_size != tx_sent) {
1153 if (tx_sent == -EAGAIN) {
1154 pr_err("tx_data() returned -EAGAIN\n");
1155 goto send_hdr;
1156 }
1157 return -1;
1158 }
1159
1160 data_len = cmd->tx_size - tx_hdr_size - cmd->padding;
40b05497
NB		 1161 /*
1162 * Set iov_off used by padding and data digest tx_data() calls below
1163 * in order to determine proper offset into cmd->iov_data[]
1164 */
1165 if (conn->conn_ops->DataDigest) {
e48354ce 1166 data_len -= ISCSI_CRC_LEN;
40b05497
NB		 1167 if (cmd->padding)
1168 iov_off = (cmd->iov_data_count - 2);
1169 else
1170 iov_off = (cmd->iov_data_count - 1);
1171 } else {
1172 iov_off = (cmd->iov_data_count - 1);
1173 }
e48354ce
NB		 1174 /*
1175 * Perform sendpage() for each page in the scatterlist
1176 */
1177 while (data_len) {
1178 u32 space = (sg->length - offset);
1179 u32 sub_len = min_t(u32, data_len, space);
1180send_pg:
1181 tx_sent = conn->sock->ops->sendpage(conn->sock,
1182 sg_page(sg), sg->offset + offset, sub_len, 0);
1183 if (tx_sent != sub_len) {
1184 if (tx_sent == -EAGAIN) {
1185 pr_err("tcp_sendpage() returned"
1186 " -EAGAIN\n");
1187 goto send_pg;
1188 }
1189
1190 pr_err("tcp_sendpage() failure: %d\n",
1191 tx_sent);
1192 return -1;
1193 }
1194
1195 data_len -= sub_len;
1196 offset = 0;
1197 sg = sg_next(sg);
1198 }
1199
1200send_padding:
1201 if (cmd->padding) {
40b05497 1202 struct kvec *iov_p = &cmd->iov_data[iov_off++];
e48354ce
NB		 1203
1204 tx_sent = tx_data(conn, iov_p, 1, cmd->padding);
1205 if (cmd->padding != tx_sent) {
1206 if (tx_sent == -EAGAIN) {
1207 pr_err("tx_data() returned -EAGAIN\n");
1208 goto send_padding;
1209 }
1210 return -1;
1211 }
1212 }
1213
1214send_datacrc:
1215 if (conn->conn_ops->DataDigest) {
40b05497 1216 struct kvec *iov_d = &cmd->iov_data[iov_off];
e48354ce
NB		 1217
1218 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN);
1219 if (ISCSI_CRC_LEN != tx_sent) {
1220 if (tx_sent == -EAGAIN) {
1221 pr_err("tx_data() returned -EAGAIN\n");
1222 goto send_datacrc;
1223 }
1224 return -1;
1225 }
1226 }
1227
1228 return 0;
1229}
1230
1231/*
1232 * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU
1233 * back to the Initiator when an expection condition occurs with the
1234 * errors set in status_class and status_detail.
1235 *
1236 * Parameters: iSCSI Connection, Status Class, Status Detail.
1237 * Returns: 0 on success, -1 on error.
1238 */
1239int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail)
1240{
e48354ce 1241 struct iscsi_login_rsp *hdr;
baa4d64b 1242 struct iscsi_login *login = conn->conn_login;
e48354ce 1243
baa4d64b 1244 login->login_failed = 1;
e48354ce
NB		 1245 iscsit_collect_login_stats(conn, status_class, status_detail);
1246
68349756
NB		 1247 memset(&login->rsp[0], 0, ISCSI_HDR_LEN);
1248
baa4d64b 1249 hdr = (struct iscsi_login_rsp *)&login->rsp[0];
e48354ce
NB		 1250 hdr->opcode = ISCSI_OP_LOGIN_RSP;
1251 hdr->status_class = status_class;
1252 hdr->status_detail = status_detail;
66c7db68 1253 hdr->itt = conn->login_itt;
e48354ce 1254
baa4d64b 1255 return conn->conn_transport->iscsit_put_login_tx(conn, login, 0);
e48354ce
NB		 1256}
1257
1258void iscsit_print_session_params(struct iscsi_session *sess)
1259{
1260 struct iscsi_conn *conn;
1261
1262 pr_debug("-----------------------------[Session Params for"
1263 " SID: %u]-----------------------------\n", sess->sid);
1264 spin_lock_bh(&sess->conn_lock);
1265 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
1266 iscsi_dump_conn_ops(conn->conn_ops);
1267 spin_unlock_bh(&sess->conn_lock);
1268
1269 iscsi_dump_sess_ops(sess->sess_ops);
1270}
1271
1272static int iscsit_do_rx_data(
1273 struct iscsi_conn *conn,
1274 struct iscsi_data_count *count)
1275{
e5a4b0bb 1276 int data = count->data_length, rx_loop = 0, total_rx = 0;
e48354ce
NB		 1277 struct msghdr msg;
1278
1279 if (!conn || !conn->sock || !conn->conn_ops)
1280 return -1;
1281
1282 memset(&msg, 0, sizeof(struct msghdr));
e5a4b0bb
AV		 1283 iov_iter_kvec(&msg.msg_iter, READ | ITER_KVEC,
1284 count->iov, count->iov_count, data);
e48354ce 1285
2da62906
AV		 1286 while (msg_data_left(&msg)) {
1287 rx_loop = sock_recvmsg(conn->sock, &msg, MSG_WAITALL);
e48354ce
NB		 1288 if (rx_loop <= 0) {
1289 pr_debug("rx_loop: %d total_rx: %d\n",
1290 rx_loop, total_rx);
1291 return rx_loop;
1292 }
1293 total_rx += rx_loop;
1294 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n",
1295 rx_loop, total_rx, data);
1296 }
1297
e48354ce
NB		 1298 return total_rx;
1299}
1300
1301static int iscsit_do_tx_data(
1302 struct iscsi_conn *conn,
1303 struct iscsi_data_count *count)
1304{
6bf6ca75 1305 int ret, iov_len;
2ff017f5 1306 struct kvec *iov_p;
e48354ce
NB		 1307 struct msghdr msg;
1308
1309 if (!conn || !conn->sock || !conn->conn_ops)
1310 return -1;
1311
6bf6ca75
NB		 1312 if (count->data_length <= 0) {
1313 pr_err("Data length is: %d\n", count->data_length);
e48354ce
NB		 1314 return -1;
1315 }
1316
1317 memset(&msg, 0, sizeof(struct msghdr));
1318
2ff017f5
NB		 1319 iov_p = count->iov;
1320 iov_len = count->iov_count;
e48354ce 1321
6bf6ca75
NB		 1322 ret = kernel_sendmsg(conn->sock, &msg, iov_p, iov_len,
1323 count->data_length);
1324 if (ret != count->data_length) {
1325 pr_err("Unexpected ret: %d send data %d\n",
1326 ret, count->data_length);
1327 return -EPIPE;
e48354ce 1328 }
6bf6ca75 1329 pr_debug("ret: %d, sent data: %d\n", ret, count->data_length);
e48354ce 1330
6bf6ca75 1331 return ret;
e48354ce
NB		 1332}
1333
1334int rx_data(
1335 struct iscsi_conn *conn,
1336 struct kvec *iov,
1337 int iov_count,
1338 int data)
1339{
1340 struct iscsi_data_count c;
1341
1342 if (!conn || !conn->sock || !conn->conn_ops)
1343 return -1;
1344
1345 memset(&c, 0, sizeof(struct iscsi_data_count));
1346 c.iov = iov;
1347 c.iov_count = iov_count;
1348 c.data_length = data;
1349 c.type = ISCSI_RX_DATA;
1350
e48354ce
NB		 1351 return iscsit_do_rx_data(conn, &c);
1352}
1353
1354int tx_data(
1355 struct iscsi_conn *conn,
1356 struct kvec *iov,
1357 int iov_count,
1358 int data)
1359{
1360 struct iscsi_data_count c;
1361
1362 if (!conn || !conn->sock || !conn->conn_ops)
1363 return -1;
1364
1365 memset(&c, 0, sizeof(struct iscsi_data_count));
1366 c.iov = iov;
1367 c.iov_count = iov_count;
1368 c.data_length = data;
1369 c.type = ISCSI_TX_DATA;
1370
e48354ce
NB		 1371 return iscsit_do_tx_data(conn, &c);
1372}
1373
dc58f760
AG		 1374static bool sockaddr_equal(struct sockaddr_storage *x, struct sockaddr_storage *y)
1375{
1376 switch (x->ss_family) {
1377 case AF_INET: {
1378 struct sockaddr_in *sinx = (struct sockaddr_in *)x;
1379 struct sockaddr_in *siny = (struct sockaddr_in *)y;
1380 if (sinx->sin_addr.s_addr != siny->sin_addr.s_addr)
1381 return false;
1382 if (sinx->sin_port != siny->sin_port)
1383 return false;
1384 break;
1385 }
1386 case AF_INET6: {
1387 struct sockaddr_in6 *sinx = (struct sockaddr_in6 *)x;
1388 struct sockaddr_in6 *siny = (struct sockaddr_in6 *)y;
1389 if (!ipv6_addr_equal(&sinx->sin6_addr, &siny->sin6_addr))
1390 return false;
1391 if (sinx->sin6_port != siny->sin6_port)
1392 return false;
1393 break;
1394 }
1395 default:
1396 return false;
1397 }
1398 return true;
1399}
1400
e48354ce
NB		 1401void iscsit_collect_login_stats(
1402 struct iscsi_conn *conn,
1403 u8 status_class,
1404 u8 status_detail)
1405{
1406 struct iscsi_param *intrname = NULL;
1407 struct iscsi_tiqn *tiqn;
1408 struct iscsi_login_stats *ls;
1409
1410 tiqn = iscsit_snmp_get_tiqn(conn);
1411 if (!tiqn)
1412 return;
1413
1414 ls = &tiqn->login_stats;
1415
1416 spin_lock(&ls->lock);
dc58f760 1417 if (sockaddr_equal(&conn->login_sockaddr, &ls->last_intr_fail_sockaddr) &&
e48354ce
NB		 1418 ((get_jiffies_64() - ls->last_fail_time) < 10)) {
1419 /* We already have the failure info for this login */
1420 spin_unlock(&ls->lock);
1421 return;
1422 }
1423
1424 if (status_class == ISCSI_STATUS_CLS_SUCCESS)
1425 ls->accepts++;
1426 else if (status_class == ISCSI_STATUS_CLS_REDIRECT) {
1427 ls->redirects++;
1428 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT;
1429 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1430 (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) {
1431 ls->authenticate_fails++;
1432 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE;
1433 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1434 (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) {
1435 ls->authorize_fails++;
1436 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE;
1437 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1438 (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) {
1439 ls->negotiate_fails++;
1440 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE;
1441 } else {
1442 ls->other_fails++;
1443 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER;
1444 }
1445
1446 /* Save initiator name, ip address and time, if it is a failed login */
1447 if (status_class != ISCSI_STATUS_CLS_SUCCESS) {
1448 if (conn->param_list)
1449 intrname = iscsi_find_param_from_key(INITIATORNAME,
1450 conn->param_list);
fdc84d11
JE		 1451 strlcpy(ls->last_intr_fail_name,
1452 (intrname ? intrname->value : "Unknown"),
1453 sizeof(ls->last_intr_fail_name));
e48354ce 1454
baa4d64b
NB		 1455 ls->last_intr_fail_ip_family = conn->login_family;
1456
dc58f760 1457 ls->last_intr_fail_sockaddr = conn->login_sockaddr;
e48354ce
NB		 1458 ls->last_fail_time = get_jiffies_64();
1459 }
1460
1461 spin_unlock(&ls->lock);
1462}
1463
1464struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn)
1465{
1466 struct iscsi_portal_group *tpg;
1467
1468 if (!conn || !conn->sess)
1469 return NULL;
1470
1471 tpg = conn->sess->tpg;
1472 if (!tpg)
1473 return NULL;
1474
1475 if (!tpg->tpg_tiqn)
1476 return NULL;
1477
1478 return tpg->tpg_tiqn;
1479}
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