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qla2xxx: Update tcm_qla2xxx module description to 24xx+
[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{
236 int ret;
237
238 /*
239 * This is the proper method of checking received CmdSN against
240 * ExpCmdSN and MaxCmdSN values, as well as accounting for out
241 * or order CmdSNs due to multiple connection sessions and/or
242 * CRC failures.
243 */
244 if (iscsi_sna_gt(cmdsn, sess->max_cmd_sn)) {
245 pr_err("Received CmdSN: 0x%08x is greater than"
ea7e32be 246 " MaxCmdSN: 0x%08x, ignoring.\n", cmdsn,
e48354ce 247 sess->max_cmd_sn);
ea7e32be 248 ret = CMDSN_MAXCMDSN_OVERRUN;
e48354ce
NB		 249
250 } else if (cmdsn == sess->exp_cmd_sn) {
251 sess->exp_cmd_sn++;
252 pr_debug("Received CmdSN matches ExpCmdSN,"
253 " incremented ExpCmdSN to: 0x%08x\n",
254 sess->exp_cmd_sn);
255 ret = CMDSN_NORMAL_OPERATION;
256
257 } else if (iscsi_sna_gt(cmdsn, sess->exp_cmd_sn)) {
258 pr_debug("Received CmdSN: 0x%08x is greater"
259 " than ExpCmdSN: 0x%08x, not acknowledging.\n",
260 cmdsn, sess->exp_cmd_sn);
261 ret = CMDSN_HIGHER_THAN_EXP;
262
263 } else {
264 pr_err("Received CmdSN: 0x%08x is less than"
265 " ExpCmdSN: 0x%08x, ignoring.\n", cmdsn,
266 sess->exp_cmd_sn);
267 ret = CMDSN_LOWER_THAN_EXP;
268 }
269
270 return ret;
271}
272
273/*
274 * Commands may be received out of order if MC/S is in use.
275 * Ensure they are executed in CmdSN order.
276 */
561bf158
NB		 277int iscsit_sequence_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
278 unsigned char *buf, __be32 cmdsn)
e48354ce 279{
561bf158
NB		 280 int ret, cmdsn_ret;
281 bool reject = false;
282 u8 reason = ISCSI_REASON_BOOKMARK_NO_RESOURCES;
e48354ce
NB		 283
284 mutex_lock(&conn->sess->cmdsn_mutex);
285
50e5c87d 286 cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, be32_to_cpu(cmdsn));
e48354ce
NB		 287 switch (cmdsn_ret) {
288 case CMDSN_NORMAL_OPERATION:
289 ret = iscsit_execute_cmd(cmd, 0);
290 if ((ret >= 0) && !list_empty(&conn->sess->sess_ooo_cmdsn_list))
291 iscsit_execute_ooo_cmdsns(conn->sess);
561bf158
NB		 292 else if (ret < 0) {
293 reject = true;
294 ret = CMDSN_ERROR_CANNOT_RECOVER;
295 }
e48354ce
NB		 296 break;
297 case CMDSN_HIGHER_THAN_EXP:
50e5c87d 298 ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, be32_to_cpu(cmdsn));
561bf158
NB		 299 if (ret < 0) {
300 reject = true;
301 ret = CMDSN_ERROR_CANNOT_RECOVER;
302 break;
303 }
304 ret = CMDSN_HIGHER_THAN_EXP;
e48354ce
NB		 305 break;
306 case CMDSN_LOWER_THAN_EXP:
ea7e32be
NB		 307 case CMDSN_MAXCMDSN_OVERRUN:
308 default:
e48354ce
NB		 309 cmd->i_state = ISTATE_REMOVE;
310 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
ea7e32be
NB		 311 /*
312 * Existing callers for iscsit_sequence_cmd() will silently
313 * ignore commands with CMDSN_LOWER_THAN_EXP, so force this
314 * return for CMDSN_MAXCMDSN_OVERRUN as well..
315 */
316 ret = CMDSN_LOWER_THAN_EXP;
e48354ce
NB		 317 break;
318 }
319 mutex_unlock(&conn->sess->cmdsn_mutex);
320
561bf158
NB		 321 if (reject)
322 iscsit_reject_cmd(cmd, reason, buf);
323
e48354ce
NB		 324 return ret;
325}
3e1c81a9 326EXPORT_SYMBOL(iscsit_sequence_cmd);
e48354ce
NB		 327
328int iscsit_check_unsolicited_dataout(struct iscsi_cmd *cmd, unsigned char *buf)
329{
330 struct iscsi_conn *conn = cmd->conn;
331 struct se_cmd *se_cmd = &cmd->se_cmd;
332 struct iscsi_data *hdr = (struct iscsi_data *) buf;
333 u32 payload_length = ntoh24(hdr->dlength);
334
335 if (conn->sess->sess_ops->InitialR2T) {
336 pr_err("Received unexpected unsolicited data"
337 " while InitialR2T=Yes, protocol error.\n");
338 transport_send_check_condition_and_sense(se_cmd,
339 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
340 return -1;
341 }
342
343 if ((cmd->first_burst_len + payload_length) >
344 conn->sess->sess_ops->FirstBurstLength) {
345 pr_err("Total %u bytes exceeds FirstBurstLength: %u"
346 " for this Unsolicited DataOut Burst.\n",
347 (cmd->first_burst_len + payload_length),
348 conn->sess->sess_ops->FirstBurstLength);
349 transport_send_check_condition_and_sense(se_cmd,
350 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
351 return -1;
352 }
353
354 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))
355 return 0;
356
ebf1d95c 357 if (((cmd->first_burst_len + payload_length) != cmd->se_cmd.data_length) &&
e48354ce
NB		 358 ((cmd->first_burst_len + payload_length) !=
359 conn->sess->sess_ops->FirstBurstLength)) {
360 pr_err("Unsolicited non-immediate data received %u"
361 " does not equal FirstBurstLength: %u, and does"
362 " not equal ExpXferLen %u.\n",
363 (cmd->first_burst_len + payload_length),
ebf1d95c 364 conn->sess->sess_ops->FirstBurstLength, cmd->se_cmd.data_length);
e48354ce
NB		 365 transport_send_check_condition_and_sense(se_cmd,
366 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
367 return -1;
368 }
369 return 0;
370}
371
372struct iscsi_cmd *iscsit_find_cmd_from_itt(
373 struct iscsi_conn *conn,
66c7db68 374 itt_t init_task_tag)
e48354ce
NB		 375{
376 struct iscsi_cmd *cmd;
377
378 spin_lock_bh(&conn->cmd_lock);
2fbb471e 379 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
e48354ce
NB		 380 if (cmd->init_task_tag == init_task_tag) {
381 spin_unlock_bh(&conn->cmd_lock);
382 return cmd;
383 }
384 }
385 spin_unlock_bh(&conn->cmd_lock);
386
387 pr_err("Unable to locate ITT: 0x%08x on CID: %hu",
388 init_task_tag, conn->cid);
389 return NULL;
390}
e4f4e801 391EXPORT_SYMBOL(iscsit_find_cmd_from_itt);
e48354ce
NB		 392
393struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump(
394 struct iscsi_conn *conn,
66c7db68 395 itt_t init_task_tag,
e48354ce
NB		 396 u32 length)
397{
398 struct iscsi_cmd *cmd;
399
400 spin_lock_bh(&conn->cmd_lock);
2fbb471e 401 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
3687db88
NB		 402 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT)
403 continue;
e48354ce
NB		 404 if (cmd->init_task_tag == init_task_tag) {
405 spin_unlock_bh(&conn->cmd_lock);
406 return cmd;
407 }
408 }
409 spin_unlock_bh(&conn->cmd_lock);
410
411 pr_err("Unable to locate ITT: 0x%08x on CID: %hu,"
412 " dumping payload\n", init_task_tag, conn->cid);
413 if (length)
414 iscsit_dump_data_payload(conn, length, 1);
415
416 return NULL;
417}
418
419struct iscsi_cmd *iscsit_find_cmd_from_ttt(
420 struct iscsi_conn *conn,
421 u32 targ_xfer_tag)
422{
423 struct iscsi_cmd *cmd = NULL;
424
425 spin_lock_bh(&conn->cmd_lock);
2fbb471e 426 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
e48354ce
NB		 427 if (cmd->targ_xfer_tag == targ_xfer_tag) {
428 spin_unlock_bh(&conn->cmd_lock);
429 return cmd;
430 }
431 }
432 spin_unlock_bh(&conn->cmd_lock);
433
434 pr_err("Unable to locate TTT: 0x%08x on CID: %hu\n",
435 targ_xfer_tag, conn->cid);
436 return NULL;
437}
438
439int iscsit_find_cmd_for_recovery(
440 struct iscsi_session *sess,
441 struct iscsi_cmd **cmd_ptr,
442 struct iscsi_conn_recovery **cr_ptr,
66c7db68 443 itt_t init_task_tag)
e48354ce
NB		 444{
445 struct iscsi_cmd *cmd = NULL;
446 struct iscsi_conn_recovery *cr;
447 /*
448 * Scan through the inactive connection recovery list's command list.
449 * If init_task_tag matches the command is still alligent.
450 */
451 spin_lock(&sess->cr_i_lock);
452 list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) {
453 spin_lock(&cr->conn_recovery_cmd_lock);
2fbb471e 454 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
e48354ce
NB		 455 if (cmd->init_task_tag == init_task_tag) {
456 spin_unlock(&cr->conn_recovery_cmd_lock);
457 spin_unlock(&sess->cr_i_lock);
458
459 *cr_ptr = cr;
460 *cmd_ptr = cmd;
461 return -2;
462 }
463 }
464 spin_unlock(&cr->conn_recovery_cmd_lock);
465 }
466 spin_unlock(&sess->cr_i_lock);
467 /*
468 * Scan through the active connection recovery list's command list.
469 * If init_task_tag matches the command is ready to be reassigned.
470 */
471 spin_lock(&sess->cr_a_lock);
472 list_for_each_entry(cr, &sess->cr_active_list, cr_list) {
473 spin_lock(&cr->conn_recovery_cmd_lock);
2fbb471e 474 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
e48354ce
NB		 475 if (cmd->init_task_tag == init_task_tag) {
476 spin_unlock(&cr->conn_recovery_cmd_lock);
477 spin_unlock(&sess->cr_a_lock);
478
479 *cr_ptr = cr;
480 *cmd_ptr = cmd;
481 return 0;
482 }
483 }
484 spin_unlock(&cr->conn_recovery_cmd_lock);
485 }
486 spin_unlock(&sess->cr_a_lock);
487
488 return -1;
489}
490
491void iscsit_add_cmd_to_immediate_queue(
492 struct iscsi_cmd *cmd,
493 struct iscsi_conn *conn,
494 u8 state)
495{
496 struct iscsi_queue_req *qr;
497
498 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
499 if (!qr) {
500 pr_err("Unable to allocate memory for"
501 " struct iscsi_queue_req\n");
502 return;
503 }
504 INIT_LIST_HEAD(&qr->qr_list);
505 qr->cmd = cmd;
506 qr->state = state;
507
508 spin_lock_bh(&conn->immed_queue_lock);
509 list_add_tail(&qr->qr_list, &conn->immed_queue_list);
510 atomic_inc(&cmd->immed_queue_count);
511 atomic_set(&conn->check_immediate_queue, 1);
512 spin_unlock_bh(&conn->immed_queue_lock);
513
d5627acb 514 wake_up(&conn->queues_wq);
e48354ce
NB		 515}
516
517struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *conn)
518{
519 struct iscsi_queue_req *qr;
520
521 spin_lock_bh(&conn->immed_queue_lock);
522 if (list_empty(&conn->immed_queue_list)) {
523 spin_unlock_bh(&conn->immed_queue_lock);
524 return NULL;
525 }
1f981de5
RD		 526 qr = list_first_entry(&conn->immed_queue_list,
527 struct iscsi_queue_req, qr_list);
e48354ce
NB		 528
529 list_del(&qr->qr_list);
530 if (qr->cmd)
531 atomic_dec(&qr->cmd->immed_queue_count);
532 spin_unlock_bh(&conn->immed_queue_lock);
533
534 return qr;
535}
536
537static void iscsit_remove_cmd_from_immediate_queue(
538 struct iscsi_cmd *cmd,
539 struct iscsi_conn *conn)
540{
541 struct iscsi_queue_req *qr, *qr_tmp;
542
543 spin_lock_bh(&conn->immed_queue_lock);
544 if (!atomic_read(&cmd->immed_queue_count)) {
545 spin_unlock_bh(&conn->immed_queue_lock);
546 return;
547 }
548
549 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
550 if (qr->cmd != cmd)
551 continue;
552
553 atomic_dec(&qr->cmd->immed_queue_count);
554 list_del(&qr->qr_list);
555 kmem_cache_free(lio_qr_cache, qr);
556 }
557 spin_unlock_bh(&conn->immed_queue_lock);
558
559 if (atomic_read(&cmd->immed_queue_count)) {
560 pr_err("ITT: 0x%08x immed_queue_count: %d\n",
561 cmd->init_task_tag,
562 atomic_read(&cmd->immed_queue_count));
563 }
564}
565
566void iscsit_add_cmd_to_response_queue(
567 struct iscsi_cmd *cmd,
568 struct iscsi_conn *conn,
569 u8 state)
570{
571 struct iscsi_queue_req *qr;
572
573 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
574 if (!qr) {
575 pr_err("Unable to allocate memory for"
576 " struct iscsi_queue_req\n");
577 return;
578 }
579 INIT_LIST_HEAD(&qr->qr_list);
580 qr->cmd = cmd;
581 qr->state = state;
582
583 spin_lock_bh(&conn->response_queue_lock);
584 list_add_tail(&qr->qr_list, &conn->response_queue_list);
585 atomic_inc(&cmd->response_queue_count);
586 spin_unlock_bh(&conn->response_queue_lock);
587
d5627acb 588 wake_up(&conn->queues_wq);
e48354ce
NB		 589}
590
591struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *conn)
592{
593 struct iscsi_queue_req *qr;
594
595 spin_lock_bh(&conn->response_queue_lock);
596 if (list_empty(&conn->response_queue_list)) {
597 spin_unlock_bh(&conn->response_queue_lock);
598 return NULL;
599 }
600
1f981de5
RD		 601 qr = list_first_entry(&conn->response_queue_list,
602 struct iscsi_queue_req, qr_list);
e48354ce
NB		 603
604 list_del(&qr->qr_list);
605 if (qr->cmd)
606 atomic_dec(&qr->cmd->response_queue_count);
607 spin_unlock_bh(&conn->response_queue_lock);
608
609 return qr;
610}
611
612static void iscsit_remove_cmd_from_response_queue(
613 struct iscsi_cmd *cmd,
614 struct iscsi_conn *conn)
615{
616 struct iscsi_queue_req *qr, *qr_tmp;
617
618 spin_lock_bh(&conn->response_queue_lock);
619 if (!atomic_read(&cmd->response_queue_count)) {
620 spin_unlock_bh(&conn->response_queue_lock);
621 return;
622 }
623
624 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
625 qr_list) {
626 if (qr->cmd != cmd)
627 continue;
628
629 atomic_dec(&qr->cmd->response_queue_count);
630 list_del(&qr->qr_list);
631 kmem_cache_free(lio_qr_cache, qr);
632 }
633 spin_unlock_bh(&conn->response_queue_lock);
634
635 if (atomic_read(&cmd->response_queue_count)) {
636 pr_err("ITT: 0x%08x response_queue_count: %d\n",
637 cmd->init_task_tag,
638 atomic_read(&cmd->response_queue_count));
639 }
640}
641
d5627acb
RD		 642bool iscsit_conn_all_queues_empty(struct iscsi_conn *conn)
643{
644 bool empty;
645
646 spin_lock_bh(&conn->immed_queue_lock);
647 empty = list_empty(&conn->immed_queue_list);
648 spin_unlock_bh(&conn->immed_queue_lock);
649
650 if (!empty)
651 return empty;
652
653 spin_lock_bh(&conn->response_queue_lock);
654 empty = list_empty(&conn->response_queue_list);
655 spin_unlock_bh(&conn->response_queue_lock);
656
657 return empty;
658}
659
e48354ce
NB		 660void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn)
661{
662 struct iscsi_queue_req *qr, *qr_tmp;
663
664 spin_lock_bh(&conn->immed_queue_lock);
665 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
666 list_del(&qr->qr_list);
667 if (qr->cmd)
668 atomic_dec(&qr->cmd->immed_queue_count);
669
670 kmem_cache_free(lio_qr_cache, qr);
671 }
672 spin_unlock_bh(&conn->immed_queue_lock);
673
674 spin_lock_bh(&conn->response_queue_lock);
675 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
676 qr_list) {
677 list_del(&qr->qr_list);
678 if (qr->cmd)
679 atomic_dec(&qr->cmd->response_queue_count);
680
681 kmem_cache_free(lio_qr_cache, qr);
682 }
683 spin_unlock_bh(&conn->response_queue_lock);
684}
685
686void iscsit_release_cmd(struct iscsi_cmd *cmd)
687{
988e3a85
NB		 688 struct iscsi_session *sess;
689 struct se_cmd *se_cmd = &cmd->se_cmd;
690
691 if (cmd->conn)
692 sess = cmd->conn->sess;
693 else
694 sess = cmd->sess;
695
696 BUG_ON(!sess || !sess->se_sess);
697
e48354ce
NB		 698 kfree(cmd->buf_ptr);
699 kfree(cmd->pdu_list);
700 kfree(cmd->seq_list);
701 kfree(cmd->tmr_req);
702 kfree(cmd->iov_data);
9864ca9d 703 kfree(cmd->text_in_ptr);
e48354ce 704
988e3a85 705 percpu_ida_free(&sess->se_sess->sess_tag_pool, se_cmd->map_tag);
aafc9d15 706}
d703ce2f 707EXPORT_SYMBOL(iscsit_release_cmd);
aafc9d15 708
131e6abc
NB		 709void __iscsit_free_cmd(struct iscsi_cmd *cmd, bool scsi_cmd,
710 bool check_queues)
aafc9d15
NB		 711{
712 struct iscsi_conn *conn = cmd->conn;
713
714 if (scsi_cmd) {
715 if (cmd->data_direction == DMA_TO_DEVICE) {
716 iscsit_stop_dataout_timer(cmd);
717 iscsit_free_r2ts_from_list(cmd);
718 }
719 if (cmd->data_direction == DMA_FROM_DEVICE)
720 iscsit_free_all_datain_reqs(cmd);
721 }
722
723 if (conn && check_queues) {
e48354ce
NB		 724 iscsit_remove_cmd_from_immediate_queue(cmd, conn);
725 iscsit_remove_cmd_from_response_queue(cmd, conn);
726 }
e48354ce
NB		 727}
728
aafc9d15 729void iscsit_free_cmd(struct iscsi_cmd *cmd, bool shutdown)
d270190a 730{
aafc9d15
NB		 731 struct se_cmd *se_cmd = NULL;
732 int rc;
d270190a 733 /*
20879696 734 * Determine if a struct se_cmd is associated with
d270190a
NB		 735 * this struct iscsi_cmd.
736 */
737 switch (cmd->iscsi_opcode) {
738 case ISCSI_OP_SCSI_CMD:
aafc9d15
NB		 739 se_cmd = &cmd->se_cmd;
740 __iscsit_free_cmd(cmd, true, shutdown);
cdb72665
NB		 741 /*
742 * Fallthrough
743 */
d270190a 744 case ISCSI_OP_SCSI_TMFUNC:
e255a285 745 rc = transport_generic_free_cmd(&cmd->se_cmd, shutdown);
aafc9d15
NB		 746 if (!rc && shutdown && se_cmd && se_cmd->se_sess) {
747 __iscsit_free_cmd(cmd, true, shutdown);
afc16604 748 target_put_sess_cmd(se_cmd);
aafc9d15 749 }
d270190a 750 break;
c1ce4bd5
NB		 751 case ISCSI_OP_REJECT:
752 /*
753 * Handle special case for REJECT when iscsi_add_reject*() has
754 * overwritten the original iscsi_opcode assignment, and the
755 * associated cmd->se_cmd needs to be released.
756 */
757 if (cmd->se_cmd.se_tfo != NULL) {
aafc9d15
NB		 758 se_cmd = &cmd->se_cmd;
759 __iscsit_free_cmd(cmd, true, shutdown);
760
e255a285 761 rc = transport_generic_free_cmd(&cmd->se_cmd, shutdown);
aafc9d15
NB		 762 if (!rc && shutdown && se_cmd->se_sess) {
763 __iscsit_free_cmd(cmd, true, shutdown);
afc16604 764 target_put_sess_cmd(se_cmd);
aafc9d15 765 }
c1ce4bd5
NB		 766 break;
767 }
768 /* Fall-through */
d270190a 769 default:
aafc9d15 770 __iscsit_free_cmd(cmd, false, shutdown);
d703ce2f 771 iscsit_release_cmd(cmd);
d270190a
NB		 772 break;
773 }
774}
775
e48354ce
NB		 776int iscsit_check_session_usage_count(struct iscsi_session *sess)
777{
778 spin_lock_bh(&sess->session_usage_lock);
779 if (sess->session_usage_count != 0) {
780 sess->session_waiting_on_uc = 1;
781 spin_unlock_bh(&sess->session_usage_lock);
782 if (in_interrupt())
783 return 2;
784
785 wait_for_completion(&sess->session_waiting_on_uc_comp);
786 return 1;
787 }
788 spin_unlock_bh(&sess->session_usage_lock);
789
790 return 0;
791}
792
793void iscsit_dec_session_usage_count(struct iscsi_session *sess)
794{
795 spin_lock_bh(&sess->session_usage_lock);
796 sess->session_usage_count--;
797
798 if (!sess->session_usage_count && sess->session_waiting_on_uc)
799 complete(&sess->session_waiting_on_uc_comp);
800
801 spin_unlock_bh(&sess->session_usage_lock);
802}
803
804void iscsit_inc_session_usage_count(struct iscsi_session *sess)
805{
806 spin_lock_bh(&sess->session_usage_lock);
807 sess->session_usage_count++;
808 spin_unlock_bh(&sess->session_usage_lock);
809}
810
e48354ce
NB		 811struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid)
812{
813 struct iscsi_conn *conn;
814
815 spin_lock_bh(&sess->conn_lock);
816 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
817 if ((conn->cid == cid) &&
818 (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) {
819 iscsit_inc_conn_usage_count(conn);
820 spin_unlock_bh(&sess->conn_lock);
821 return conn;
822 }
823 }
824 spin_unlock_bh(&sess->conn_lock);
825
826 return NULL;
827}
828
829struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid)
830{
831 struct iscsi_conn *conn;
832
833 spin_lock_bh(&sess->conn_lock);
834 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
835 if (conn->cid == cid) {
836 iscsit_inc_conn_usage_count(conn);
837 spin_lock(&conn->state_lock);
838 atomic_set(&conn->connection_wait_rcfr, 1);
839 spin_unlock(&conn->state_lock);
840 spin_unlock_bh(&sess->conn_lock);
841 return conn;
842 }
843 }
844 spin_unlock_bh(&sess->conn_lock);
845
846 return NULL;
847}
848
849void iscsit_check_conn_usage_count(struct iscsi_conn *conn)
850{
851 spin_lock_bh(&conn->conn_usage_lock);
852 if (conn->conn_usage_count != 0) {
853 conn->conn_waiting_on_uc = 1;
854 spin_unlock_bh(&conn->conn_usage_lock);
855
856 wait_for_completion(&conn->conn_waiting_on_uc_comp);
857 return;
858 }
859 spin_unlock_bh(&conn->conn_usage_lock);
860}
861
862void iscsit_dec_conn_usage_count(struct iscsi_conn *conn)
863{
864 spin_lock_bh(&conn->conn_usage_lock);
865 conn->conn_usage_count--;
866
867 if (!conn->conn_usage_count && conn->conn_waiting_on_uc)
868 complete(&conn->conn_waiting_on_uc_comp);
869
870 spin_unlock_bh(&conn->conn_usage_lock);
871}
872
873void iscsit_inc_conn_usage_count(struct iscsi_conn *conn)
874{
875 spin_lock_bh(&conn->conn_usage_lock);
876 conn->conn_usage_count++;
877 spin_unlock_bh(&conn->conn_usage_lock);
878}
879
880static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response)
881{
882 u8 state;
883 struct iscsi_cmd *cmd;
884
676687c6 885 cmd = iscsit_allocate_cmd(conn, TASK_RUNNING);
e48354ce
NB		 886 if (!cmd)
887 return -1;
888
889 cmd->iscsi_opcode = ISCSI_OP_NOOP_IN;
890 state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE :
891 ISTATE_SEND_NOPIN_NO_RESPONSE;
66c7db68 892 cmd->init_task_tag = RESERVED_ITT;
c1e34b64
SG		 893 cmd->targ_xfer_tag = (want_response) ?
894 session_get_next_ttt(conn->sess) : 0xFFFFFFFF;
e48354ce 895 spin_lock_bh(&conn->cmd_lock);
2fbb471e 896 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 897 spin_unlock_bh(&conn->cmd_lock);
898
899 if (want_response)
900 iscsit_start_nopin_response_timer(conn);
901 iscsit_add_cmd_to_immediate_queue(cmd, conn, state);
902
903 return 0;
904}
905
906static void iscsit_handle_nopin_response_timeout(unsigned long data)
907{
908 struct iscsi_conn *conn = (struct iscsi_conn *) data;
909
910 iscsit_inc_conn_usage_count(conn);
911
912 spin_lock_bh(&conn->nopin_timer_lock);
913 if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) {
914 spin_unlock_bh(&conn->nopin_timer_lock);
915 iscsit_dec_conn_usage_count(conn);
916 return;
917 }
918
919 pr_debug("Did not receive response to NOPIN on CID: %hu on"
920 " SID: %u, failing connection.\n", conn->cid,
921 conn->sess->sid);
922 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
923 spin_unlock_bh(&conn->nopin_timer_lock);
924
925 {
926 struct iscsi_portal_group *tpg = conn->sess->tpg;
927 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
928
929 if (tiqn) {
930 spin_lock_bh(&tiqn->sess_err_stats.lock);
931 strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
8359cf43 932 conn->sess->sess_ops->InitiatorName);
e48354ce
NB		 933 tiqn->sess_err_stats.last_sess_failure_type =
934 ISCSI_SESS_ERR_CXN_TIMEOUT;
935 tiqn->sess_err_stats.cxn_timeout_errors++;
04f3b31b 936 atomic_long_inc(&conn->sess->conn_timeout_errors);
e48354ce
NB		 937 spin_unlock_bh(&tiqn->sess_err_stats.lock);
938 }
939 }
940
941 iscsit_cause_connection_reinstatement(conn, 0);
942 iscsit_dec_conn_usage_count(conn);
943}
944
945void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn)
946{
947 struct iscsi_session *sess = conn->sess;
948 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
949
950 spin_lock_bh(&conn->nopin_timer_lock);
951 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
952 spin_unlock_bh(&conn->nopin_timer_lock);
953 return;
954 }
955
956 mod_timer(&conn->nopin_response_timer,
957 (get_jiffies_64() + na->nopin_response_timeout * HZ));
958 spin_unlock_bh(&conn->nopin_timer_lock);
959}
960
961/*
962 * Called with conn->nopin_timer_lock held.
963 */
964void iscsit_start_nopin_response_timer(struct iscsi_conn *conn)
965{
966 struct iscsi_session *sess = conn->sess;
967 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
968
969 spin_lock_bh(&conn->nopin_timer_lock);
970 if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) {
971 spin_unlock_bh(&conn->nopin_timer_lock);
972 return;
973 }
974
975 init_timer(&conn->nopin_response_timer);
976 conn->nopin_response_timer.expires =
977 (get_jiffies_64() + na->nopin_response_timeout * HZ);
978 conn->nopin_response_timer.data = (unsigned long)conn;
979 conn->nopin_response_timer.function = iscsit_handle_nopin_response_timeout;
980 conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP;
981 conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING;
982 add_timer(&conn->nopin_response_timer);
983
984 pr_debug("Started NOPIN Response Timer on CID: %d to %u"
985 " seconds\n", conn->cid, na->nopin_response_timeout);
986 spin_unlock_bh(&conn->nopin_timer_lock);
987}
988
989void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn)
990{
991 spin_lock_bh(&conn->nopin_timer_lock);
992 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
993 spin_unlock_bh(&conn->nopin_timer_lock);
994 return;
995 }
996 conn->nopin_response_timer_flags |= ISCSI_TF_STOP;
997 spin_unlock_bh(&conn->nopin_timer_lock);
998
999 del_timer_sync(&conn->nopin_response_timer);
1000
1001 spin_lock_bh(&conn->nopin_timer_lock);
1002 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
1003 spin_unlock_bh(&conn->nopin_timer_lock);
1004}
1005
1006static void iscsit_handle_nopin_timeout(unsigned long data)
1007{
1008 struct iscsi_conn *conn = (struct iscsi_conn *) data;
1009
1010 iscsit_inc_conn_usage_count(conn);
1011
1012 spin_lock_bh(&conn->nopin_timer_lock);
1013 if (conn->nopin_timer_flags & ISCSI_TF_STOP) {
1014 spin_unlock_bh(&conn->nopin_timer_lock);
1015 iscsit_dec_conn_usage_count(conn);
1016 return;
1017 }
1018 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1019 spin_unlock_bh(&conn->nopin_timer_lock);
1020
1021 iscsit_add_nopin(conn, 1);
1022 iscsit_dec_conn_usage_count(conn);
1023}
1024
1025/*
1026 * Called with conn->nopin_timer_lock held.
1027 */
1028void __iscsit_start_nopin_timer(struct iscsi_conn *conn)
1029{
1030 struct iscsi_session *sess = conn->sess;
1031 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1032 /*
1033 * NOPIN timeout is disabled.
1034 */
1035 if (!na->nopin_timeout)
1036 return;
1037
1038 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING)
1039 return;
1040
1041 init_timer(&conn->nopin_timer);
1042 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1043 conn->nopin_timer.data = (unsigned long)conn;
1044 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1045 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1046 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1047 add_timer(&conn->nopin_timer);
1048
1049 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1050 " interval\n", conn->cid, na->nopin_timeout);
1051}
1052
1053void iscsit_start_nopin_timer(struct iscsi_conn *conn)
1054{
1055 struct iscsi_session *sess = conn->sess;
1056 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1057 /*
1058 * NOPIN timeout is disabled..
1059 */
1060 if (!na->nopin_timeout)
1061 return;
1062
1063 spin_lock_bh(&conn->nopin_timer_lock);
1064 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) {
1065 spin_unlock_bh(&conn->nopin_timer_lock);
1066 return;
1067 }
1068
1069 init_timer(&conn->nopin_timer);
1070 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1071 conn->nopin_timer.data = (unsigned long)conn;
1072 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1073 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1074 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1075 add_timer(&conn->nopin_timer);
1076
1077 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1078 " interval\n", conn->cid, na->nopin_timeout);
1079 spin_unlock_bh(&conn->nopin_timer_lock);
1080}
1081
1082void iscsit_stop_nopin_timer(struct iscsi_conn *conn)
1083{
1084 spin_lock_bh(&conn->nopin_timer_lock);
1085 if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) {
1086 spin_unlock_bh(&conn->nopin_timer_lock);
1087 return;
1088 }
1089 conn->nopin_timer_flags |= ISCSI_TF_STOP;
1090 spin_unlock_bh(&conn->nopin_timer_lock);
1091
1092 del_timer_sync(&conn->nopin_timer);
1093
1094 spin_lock_bh(&conn->nopin_timer_lock);
1095 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1096 spin_unlock_bh(&conn->nopin_timer_lock);
1097}
1098
1099int iscsit_send_tx_data(
1100 struct iscsi_cmd *cmd,
1101 struct iscsi_conn *conn,
1102 int use_misc)
1103{
1104 int tx_sent, tx_size;
1105 u32 iov_count;
1106 struct kvec *iov;
1107
1108send_data:
1109 tx_size = cmd->tx_size;
1110
1111 if (!use_misc) {
1112 iov = &cmd->iov_data[0];
1113 iov_count = cmd->iov_data_count;
1114 } else {
1115 iov = &cmd->iov_misc[0];
1116 iov_count = cmd->iov_misc_count;
1117 }
1118
1119 tx_sent = tx_data(conn, &iov[0], iov_count, tx_size);
1120 if (tx_size != tx_sent) {
1121 if (tx_sent == -EAGAIN) {
1122 pr_err("tx_data() returned -EAGAIN\n");
1123 goto send_data;
1124 } else
1125 return -1;
1126 }
1127 cmd->tx_size = 0;
1128
1129 return 0;
1130}
1131
1132int iscsit_fe_sendpage_sg(
1133 struct iscsi_cmd *cmd,
1134 struct iscsi_conn *conn)
1135{
1136 struct scatterlist *sg = cmd->first_data_sg;
1137 struct kvec iov;
1138 u32 tx_hdr_size, data_len;
1139 u32 offset = cmd->first_data_sg_off;
40b05497 1140 int tx_sent, iov_off;
e48354ce
NB		 1141
1142send_hdr:
1143 tx_hdr_size = ISCSI_HDR_LEN;
1144 if (conn->conn_ops->HeaderDigest)
1145 tx_hdr_size += ISCSI_CRC_LEN;
1146
1147 iov.iov_base = cmd->pdu;
1148 iov.iov_len = tx_hdr_size;
1149
1150 tx_sent = tx_data(conn, &iov, 1, tx_hdr_size);
1151 if (tx_hdr_size != tx_sent) {
1152 if (tx_sent == -EAGAIN) {
1153 pr_err("tx_data() returned -EAGAIN\n");
1154 goto send_hdr;
1155 }
1156 return -1;
1157 }
1158
1159 data_len = cmd->tx_size - tx_hdr_size - cmd->padding;
40b05497
NB		 1160 /*
1161 * Set iov_off used by padding and data digest tx_data() calls below
1162 * in order to determine proper offset into cmd->iov_data[]
1163 */
1164 if (conn->conn_ops->DataDigest) {
e48354ce 1165 data_len -= ISCSI_CRC_LEN;
40b05497
NB		 1166 if (cmd->padding)
1167 iov_off = (cmd->iov_data_count - 2);
1168 else
1169 iov_off = (cmd->iov_data_count - 1);
1170 } else {
1171 iov_off = (cmd->iov_data_count - 1);
1172 }
e48354ce
NB		 1173 /*
1174 * Perform sendpage() for each page in the scatterlist
1175 */
1176 while (data_len) {
1177 u32 space = (sg->length - offset);
1178 u32 sub_len = min_t(u32, data_len, space);
1179send_pg:
1180 tx_sent = conn->sock->ops->sendpage(conn->sock,
1181 sg_page(sg), sg->offset + offset, sub_len, 0);
1182 if (tx_sent != sub_len) {
1183 if (tx_sent == -EAGAIN) {
1184 pr_err("tcp_sendpage() returned"
1185 " -EAGAIN\n");
1186 goto send_pg;
1187 }
1188
1189 pr_err("tcp_sendpage() failure: %d\n",
1190 tx_sent);
1191 return -1;
1192 }
1193
1194 data_len -= sub_len;
1195 offset = 0;
1196 sg = sg_next(sg);
1197 }
1198
1199send_padding:
1200 if (cmd->padding) {
40b05497 1201 struct kvec *iov_p = &cmd->iov_data[iov_off++];
e48354ce
NB		 1202
1203 tx_sent = tx_data(conn, iov_p, 1, cmd->padding);
1204 if (cmd->padding != tx_sent) {
1205 if (tx_sent == -EAGAIN) {
1206 pr_err("tx_data() returned -EAGAIN\n");
1207 goto send_padding;
1208 }
1209 return -1;
1210 }
1211 }
1212
1213send_datacrc:
1214 if (conn->conn_ops->DataDigest) {
40b05497 1215 struct kvec *iov_d = &cmd->iov_data[iov_off];
e48354ce
NB		 1216
1217 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN);
1218 if (ISCSI_CRC_LEN != tx_sent) {
1219 if (tx_sent == -EAGAIN) {
1220 pr_err("tx_data() returned -EAGAIN\n");
1221 goto send_datacrc;
1222 }
1223 return -1;
1224 }
1225 }
1226
1227 return 0;
1228}
1229
1230/*
1231 * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU
1232 * back to the Initiator when an expection condition occurs with the
1233 * errors set in status_class and status_detail.
1234 *
1235 * Parameters: iSCSI Connection, Status Class, Status Detail.
1236 * Returns: 0 on success, -1 on error.
1237 */
1238int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail)
1239{
e48354ce 1240 struct iscsi_login_rsp *hdr;
baa4d64b 1241 struct iscsi_login *login = conn->conn_login;
e48354ce 1242
baa4d64b 1243 login->login_failed = 1;
e48354ce
NB		 1244 iscsit_collect_login_stats(conn, status_class, status_detail);
1245
68349756
NB		 1246 memset(&login->rsp[0], 0, ISCSI_HDR_LEN);
1247
baa4d64b 1248 hdr = (struct iscsi_login_rsp *)&login->rsp[0];
e48354ce
NB		 1249 hdr->opcode = ISCSI_OP_LOGIN_RSP;
1250 hdr->status_class = status_class;
1251 hdr->status_detail = status_detail;
66c7db68 1252 hdr->itt = conn->login_itt;
e48354ce 1253
baa4d64b 1254 return conn->conn_transport->iscsit_put_login_tx(conn, login, 0);
e48354ce
NB		 1255}
1256
1257void iscsit_print_session_params(struct iscsi_session *sess)
1258{
1259 struct iscsi_conn *conn;
1260
1261 pr_debug("-----------------------------[Session Params for"
1262 " SID: %u]-----------------------------\n", sess->sid);
1263 spin_lock_bh(&sess->conn_lock);
1264 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
1265 iscsi_dump_conn_ops(conn->conn_ops);
1266 spin_unlock_bh(&sess->conn_lock);
1267
1268 iscsi_dump_sess_ops(sess->sess_ops);
1269}
1270
1271static int iscsit_do_rx_data(
1272 struct iscsi_conn *conn,
1273 struct iscsi_data_count *count)
1274{
e5a4b0bb 1275 int data = count->data_length, rx_loop = 0, total_rx = 0;
e48354ce
NB		 1276 struct msghdr msg;
1277
1278 if (!conn || !conn->sock || !conn->conn_ops)
1279 return -1;
1280
1281 memset(&msg, 0, sizeof(struct msghdr));
e5a4b0bb
AV		 1282 iov_iter_kvec(&msg.msg_iter, READ | ITER_KVEC,
1283 count->iov, count->iov_count, data);
e48354ce
NB		 1284
1285 while (total_rx < data) {
e5a4b0bb
AV		 1286 rx_loop = sock_recvmsg(conn->sock, &msg,
1287 (data - total_rx), 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
1374void iscsit_collect_login_stats(
1375 struct iscsi_conn *conn,
1376 u8 status_class,
1377 u8 status_detail)
1378{
1379 struct iscsi_param *intrname = NULL;
1380 struct iscsi_tiqn *tiqn;
1381 struct iscsi_login_stats *ls;
1382
1383 tiqn = iscsit_snmp_get_tiqn(conn);
1384 if (!tiqn)
1385 return;
1386
1387 ls = &tiqn->login_stats;
1388
1389 spin_lock(&ls->lock);
1390 if (!strcmp(conn->login_ip, ls->last_intr_fail_ip_addr) &&
1391 ((get_jiffies_64() - ls->last_fail_time) < 10)) {
1392 /* We already have the failure info for this login */
1393 spin_unlock(&ls->lock);
1394 return;
1395 }
1396
1397 if (status_class == ISCSI_STATUS_CLS_SUCCESS)
1398 ls->accepts++;
1399 else if (status_class == ISCSI_STATUS_CLS_REDIRECT) {
1400 ls->redirects++;
1401 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT;
1402 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1403 (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) {
1404 ls->authenticate_fails++;
1405 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE;
1406 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1407 (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) {
1408 ls->authorize_fails++;
1409 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE;
1410 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1411 (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) {
1412 ls->negotiate_fails++;
1413 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE;
1414 } else {
1415 ls->other_fails++;
1416 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER;
1417 }
1418
1419 /* Save initiator name, ip address and time, if it is a failed login */
1420 if (status_class != ISCSI_STATUS_CLS_SUCCESS) {
1421 if (conn->param_list)
1422 intrname = iscsi_find_param_from_key(INITIATORNAME,
1423 conn->param_list);
fdc84d11
JE		 1424 strlcpy(ls->last_intr_fail_name,
1425 (intrname ? intrname->value : "Unknown"),
1426 sizeof(ls->last_intr_fail_name));
e48354ce 1427
baa4d64b
NB		 1428 ls->last_intr_fail_ip_family = conn->login_family;
1429
e48354ce
NB		 1430 snprintf(ls->last_intr_fail_ip_addr, IPV6_ADDRESS_SPACE,
1431 "%s", conn->login_ip);
1432 ls->last_fail_time = get_jiffies_64();
1433 }
1434
1435 spin_unlock(&ls->lock);
1436}
1437
1438struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn)
1439{
1440 struct iscsi_portal_group *tpg;
1441
1442 if (!conn || !conn->sess)
1443 return NULL;
1444
1445 tpg = conn->sess->tpg;
1446 if (!tpg)
1447 return NULL;
1448
1449 if (!tpg->tpg_tiqn)
1450 return NULL;
1451
1452 return tpg->tpg_tiqn;
1453}
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