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Merge tag 'v3.10.107' into update
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / target / iscsi / iscsi_target_util.c
CommitLineData
e48354ce
NB		 1/*******************************************************************************
2 * This file contains the iSCSI Target specific utility functions.
3 *
4 * \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
5 *
6 * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
7 *
8 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 ******************************************************************************/
20
21#include <linux/list.h>
22#include <scsi/scsi_tcq.h>
23#include <scsi/iscsi_proto.h>
24#include <target/target_core_base.h>
c4795fb2 25#include <target/target_core_fabric.h>
e48354ce 26#include <target/target_core_configfs.h>
baa4d64b 27#include <target/iscsi/iscsi_transport.h>
e48354ce
NB		 28
29#include "iscsi_target_core.h"
30#include "iscsi_target_parameters.h"
31#include "iscsi_target_seq_pdu_list.h"
32#include "iscsi_target_datain_values.h"
33#include "iscsi_target_erl0.h"
34#include "iscsi_target_erl1.h"
35#include "iscsi_target_erl2.h"
36#include "iscsi_target_tpg.h"
37#include "iscsi_target_tq.h"
38#include "iscsi_target_util.h"
39#include "iscsi_target.h"
40
41#define PRINT_BUFF(buff, len) \
42{ \
43 int zzz; \
44 \
45 pr_debug("%d:\n", __LINE__); \
46 for (zzz = 0; zzz < len; zzz++) { \
47 if (zzz % 16 == 0) { \
48 if (zzz) \
49 pr_debug("\n"); \
50 pr_debug("%4i: ", zzz); \
51 } \
52 pr_debug("%02x ", (unsigned char) (buff)[zzz]); \
53 } \
54 if ((len + 1) % 16) \
55 pr_debug("\n"); \
56}
57
58extern struct list_head g_tiqn_list;
59extern spinlock_t tiqn_lock;
60
61/*
62 * Called with cmd->r2t_lock held.
63 */
64int iscsit_add_r2t_to_list(
65 struct iscsi_cmd *cmd,
66 u32 offset,
67 u32 xfer_len,
68 int recovery,
69 u32 r2t_sn)
70{
71 struct iscsi_r2t *r2t;
72
73 r2t = kmem_cache_zalloc(lio_r2t_cache, GFP_ATOMIC);
74 if (!r2t) {
75 pr_err("Unable to allocate memory for struct iscsi_r2t.\n");
76 return -1;
77 }
78 INIT_LIST_HEAD(&r2t->r2t_list);
79
80 r2t->recovery_r2t = recovery;
81 r2t->r2t_sn = (!r2t_sn) ? cmd->r2t_sn++ : r2t_sn;
82 r2t->offset = offset;
83 r2t->xfer_len = xfer_len;
84 list_add_tail(&r2t->r2t_list, &cmd->cmd_r2t_list);
85 spin_unlock_bh(&cmd->r2t_lock);
86
87 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, ISTATE_SEND_R2T);
88
89 spin_lock_bh(&cmd->r2t_lock);
90 return 0;
91}
92
93struct iscsi_r2t *iscsit_get_r2t_for_eos(
94 struct iscsi_cmd *cmd,
95 u32 offset,
96 u32 length)
97{
98 struct iscsi_r2t *r2t;
99
100 spin_lock_bh(&cmd->r2t_lock);
101 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
102 if ((r2t->offset <= offset) &&
103 (r2t->offset + r2t->xfer_len) >= (offset + length)) {
104 spin_unlock_bh(&cmd->r2t_lock);
105 return r2t;
106 }
107 }
108 spin_unlock_bh(&cmd->r2t_lock);
109
110 pr_err("Unable to locate R2T for Offset: %u, Length:"
111 " %u\n", offset, length);
112 return NULL;
113}
114
115struct iscsi_r2t *iscsit_get_r2t_from_list(struct iscsi_cmd *cmd)
116{
117 struct iscsi_r2t *r2t;
118
119 spin_lock_bh(&cmd->r2t_lock);
120 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
121 if (!r2t->sent_r2t) {
122 spin_unlock_bh(&cmd->r2t_lock);
123 return r2t;
124 }
125 }
126 spin_unlock_bh(&cmd->r2t_lock);
127
128 pr_err("Unable to locate next R2T to send for ITT:"
129 " 0x%08x.\n", cmd->init_task_tag);
130 return NULL;
131}
132
133/*
134 * Called with cmd->r2t_lock held.
135 */
136void iscsit_free_r2t(struct iscsi_r2t *r2t, struct iscsi_cmd *cmd)
137{
138 list_del(&r2t->r2t_list);
139 kmem_cache_free(lio_r2t_cache, r2t);
140}
141
142void iscsit_free_r2ts_from_list(struct iscsi_cmd *cmd)
143{
144 struct iscsi_r2t *r2t, *r2t_tmp;
145
146 spin_lock_bh(&cmd->r2t_lock);
147 list_for_each_entry_safe(r2t, r2t_tmp, &cmd->cmd_r2t_list, r2t_list)
148 iscsit_free_r2t(r2t, cmd);
149 spin_unlock_bh(&cmd->r2t_lock);
150}
151
cdb72665
NB		 152struct iscsi_cmd *iscsit_alloc_cmd(struct iscsi_conn *conn, gfp_t gfp_mask)
153{
154 struct iscsi_cmd *cmd;
155
156 cmd = kmem_cache_zalloc(lio_cmd_cache, gfp_mask);
157 if (!cmd)
158 return NULL;
159
160 cmd->release_cmd = &iscsit_release_cmd;
161 return cmd;
162}
163
e48354ce
NB		 164/*
165 * May be called from software interrupt (timer) context for allocating
166 * iSCSI NopINs.
167 */
168struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *conn, gfp_t gfp_mask)
169{
170 struct iscsi_cmd *cmd;
171
cdb72665 172 cmd = conn->conn_transport->iscsit_alloc_cmd(conn, gfp_mask);
e48354ce
NB		 173 if (!cmd) {
174 pr_err("Unable to allocate memory for struct iscsi_cmd.\n");
175 return NULL;
176 }
cdb72665 177 cmd->conn = conn;
2fbb471e 178 INIT_LIST_HEAD(&cmd->i_conn_node);
e48354ce
NB		 179 INIT_LIST_HEAD(&cmd->datain_list);
180 INIT_LIST_HEAD(&cmd->cmd_r2t_list);
e48354ce
NB		 181 spin_lock_init(&cmd->datain_lock);
182 spin_lock_init(&cmd->dataout_timeout_lock);
183 spin_lock_init(&cmd->istate_lock);
184 spin_lock_init(&cmd->error_lock);
185 spin_lock_init(&cmd->r2t_lock);
186
187 return cmd;
188}
cdb72665 189EXPORT_SYMBOL(iscsit_allocate_cmd);
e48354ce 190
e48354ce
NB		 191struct iscsi_seq *iscsit_get_seq_holder_for_datain(
192 struct iscsi_cmd *cmd,
193 u32 seq_send_order)
194{
195 u32 i;
196
197 for (i = 0; i < cmd->seq_count; i++)
198 if (cmd->seq_list[i].seq_send_order == seq_send_order)
199 return &cmd->seq_list[i];
200
201 return NULL;
202}
203
204struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsi_cmd *cmd)
205{
206 u32 i;
207
208 if (!cmd->seq_list) {
209 pr_err("struct iscsi_cmd->seq_list is NULL!\n");
210 return NULL;
211 }
212
213 for (i = 0; i < cmd->seq_count; i++) {
214 if (cmd->seq_list[i].type != SEQTYPE_NORMAL)
215 continue;
216 if (cmd->seq_list[i].seq_send_order == cmd->seq_send_order) {
217 cmd->seq_send_order++;
218 return &cmd->seq_list[i];
219 }
220 }
221
222 return NULL;
223}
224
225struct iscsi_r2t *iscsit_get_holder_for_r2tsn(
226 struct iscsi_cmd *cmd,
227 u32 r2t_sn)
228{
229 struct iscsi_r2t *r2t;
230
231 spin_lock_bh(&cmd->r2t_lock);
232 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
233 if (r2t->r2t_sn == r2t_sn) {
234 spin_unlock_bh(&cmd->r2t_lock);
235 return r2t;
236 }
237 }
238 spin_unlock_bh(&cmd->r2t_lock);
239
240 return NULL;
241}
242
243static inline int iscsit_check_received_cmdsn(struct iscsi_session *sess, u32 cmdsn)
244{
245 int ret;
246
247 /*
248 * This is the proper method of checking received CmdSN against
249 * ExpCmdSN and MaxCmdSN values, as well as accounting for out
250 * or order CmdSNs due to multiple connection sessions and/or
251 * CRC failures.
252 */
253 if (iscsi_sna_gt(cmdsn, sess->max_cmd_sn)) {
254 pr_err("Received CmdSN: 0x%08x is greater than"
255 " MaxCmdSN: 0x%08x, protocol error.\n", cmdsn,
256 sess->max_cmd_sn);
257 ret = CMDSN_ERROR_CANNOT_RECOVER;
258
259 } else if (cmdsn == sess->exp_cmd_sn) {
260 sess->exp_cmd_sn++;
261 pr_debug("Received CmdSN matches ExpCmdSN,"
262 " incremented ExpCmdSN to: 0x%08x\n",
263 sess->exp_cmd_sn);
264 ret = CMDSN_NORMAL_OPERATION;
265
266 } else if (iscsi_sna_gt(cmdsn, sess->exp_cmd_sn)) {
267 pr_debug("Received CmdSN: 0x%08x is greater"
268 " than ExpCmdSN: 0x%08x, not acknowledging.\n",
269 cmdsn, sess->exp_cmd_sn);
270 ret = CMDSN_HIGHER_THAN_EXP;
271
272 } else {
273 pr_err("Received CmdSN: 0x%08x is less than"
274 " ExpCmdSN: 0x%08x, ignoring.\n", cmdsn,
275 sess->exp_cmd_sn);
276 ret = CMDSN_LOWER_THAN_EXP;
277 }
278
279 return ret;
280}
281
282/*
283 * Commands may be received out of order if MC/S is in use.
284 * Ensure they are executed in CmdSN order.
285 */
adb97c29
NB		 286int iscsit_sequence_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
287 unsigned char *buf, __be32 cmdsn)
e48354ce 288{
adb97c29
NB		 289 int ret, cmdsn_ret;
290 bool reject = false;
291 u8 reason = ISCSI_REASON_BOOKMARK_NO_RESOURCES;
e48354ce
NB		 292
293 mutex_lock(&conn->sess->cmdsn_mutex);
294
50e5c87d 295 cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, be32_to_cpu(cmdsn));
e48354ce
NB		 296 switch (cmdsn_ret) {
297 case CMDSN_NORMAL_OPERATION:
298 ret = iscsit_execute_cmd(cmd, 0);
299 if ((ret >= 0) && !list_empty(&conn->sess->sess_ooo_cmdsn_list))
300 iscsit_execute_ooo_cmdsns(conn->sess);
adb97c29
NB		 301 else if (ret < 0) {
302 reject = true;
303 ret = CMDSN_ERROR_CANNOT_RECOVER;
304 }
e48354ce
NB		 305 break;
306 case CMDSN_HIGHER_THAN_EXP:
50e5c87d 307 ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, be32_to_cpu(cmdsn));
adb97c29
NB		 308 if (ret < 0) {
309 reject = true;
310 ret = CMDSN_ERROR_CANNOT_RECOVER;
311 break;
312 }
313 ret = CMDSN_HIGHER_THAN_EXP;
e48354ce
NB		 314 break;
315 case CMDSN_LOWER_THAN_EXP:
316 cmd->i_state = ISTATE_REMOVE;
317 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
318 ret = cmdsn_ret;
319 break;
320 default:
adb97c29
NB		 321 reason = ISCSI_REASON_PROTOCOL_ERROR;
322 reject = true;
e48354ce
NB		 323 ret = cmdsn_ret;
324 break;
325 }
326 mutex_unlock(&conn->sess->cmdsn_mutex);
327
adb97c29
NB		 328 if (reject)
329 iscsit_reject_cmd(cmd, reason, buf);
330
e48354ce
NB		 331 return ret;
332}
3e1c81a9 333EXPORT_SYMBOL(iscsit_sequence_cmd);
e48354ce
NB		 334
335int iscsit_check_unsolicited_dataout(struct iscsi_cmd *cmd, unsigned char *buf)
336{
337 struct iscsi_conn *conn = cmd->conn;
338 struct se_cmd *se_cmd = &cmd->se_cmd;
339 struct iscsi_data *hdr = (struct iscsi_data *) buf;
340 u32 payload_length = ntoh24(hdr->dlength);
341
342 if (conn->sess->sess_ops->InitialR2T) {
343 pr_err("Received unexpected unsolicited data"
344 " while InitialR2T=Yes, protocol error.\n");
345 transport_send_check_condition_and_sense(se_cmd,
346 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
347 return -1;
348 }
349
350 if ((cmd->first_burst_len + payload_length) >
351 conn->sess->sess_ops->FirstBurstLength) {
352 pr_err("Total %u bytes exceeds FirstBurstLength: %u"
353 " for this Unsolicited DataOut Burst.\n",
354 (cmd->first_burst_len + payload_length),
355 conn->sess->sess_ops->FirstBurstLength);
356 transport_send_check_condition_and_sense(se_cmd,
357 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
358 return -1;
359 }
360
361 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))
362 return 0;
363
ebf1d95c 364 if (((cmd->first_burst_len + payload_length) != cmd->se_cmd.data_length) &&
e48354ce
NB		 365 ((cmd->first_burst_len + payload_length) !=
366 conn->sess->sess_ops->FirstBurstLength)) {
367 pr_err("Unsolicited non-immediate data received %u"
368 " does not equal FirstBurstLength: %u, and does"
369 " not equal ExpXferLen %u.\n",
370 (cmd->first_burst_len + payload_length),
ebf1d95c 371 conn->sess->sess_ops->FirstBurstLength, cmd->se_cmd.data_length);
e48354ce
NB		 372 transport_send_check_condition_and_sense(se_cmd,
373 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
374 return -1;
375 }
376 return 0;
377}
378
379struct iscsi_cmd *iscsit_find_cmd_from_itt(
380 struct iscsi_conn *conn,
66c7db68 381 itt_t init_task_tag)
e48354ce
NB		 382{
383 struct iscsi_cmd *cmd;
384
385 spin_lock_bh(&conn->cmd_lock);
2fbb471e 386 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
e48354ce
NB		 387 if (cmd->init_task_tag == init_task_tag) {
388 spin_unlock_bh(&conn->cmd_lock);
389 return cmd;
390 }
391 }
392 spin_unlock_bh(&conn->cmd_lock);
393
394 pr_err("Unable to locate ITT: 0x%08x on CID: %hu",
395 init_task_tag, conn->cid);
396 return NULL;
397}
398
399struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump(
400 struct iscsi_conn *conn,
66c7db68 401 itt_t init_task_tag,
e48354ce
NB		 402 u32 length)
403{
404 struct iscsi_cmd *cmd;
405
406 spin_lock_bh(&conn->cmd_lock);
2fbb471e 407 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
e48354ce
NB		 408 if (cmd->init_task_tag == init_task_tag) {
409 spin_unlock_bh(&conn->cmd_lock);
410 return cmd;
411 }
412 }
413 spin_unlock_bh(&conn->cmd_lock);
414
415 pr_err("Unable to locate ITT: 0x%08x on CID: %hu,"
416 " dumping payload\n", init_task_tag, conn->cid);
417 if (length)
418 iscsit_dump_data_payload(conn, length, 1);
419
420 return NULL;
421}
422
423struct iscsi_cmd *iscsit_find_cmd_from_ttt(
424 struct iscsi_conn *conn,
425 u32 targ_xfer_tag)
426{
427 struct iscsi_cmd *cmd = NULL;
428
429 spin_lock_bh(&conn->cmd_lock);
2fbb471e 430 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
e48354ce
NB		 431 if (cmd->targ_xfer_tag == targ_xfer_tag) {
432 spin_unlock_bh(&conn->cmd_lock);
433 return cmd;
434 }
435 }
436 spin_unlock_bh(&conn->cmd_lock);
437
438 pr_err("Unable to locate TTT: 0x%08x on CID: %hu\n",
439 targ_xfer_tag, conn->cid);
440 return NULL;
441}
442
443int iscsit_find_cmd_for_recovery(
444 struct iscsi_session *sess,
445 struct iscsi_cmd **cmd_ptr,
446 struct iscsi_conn_recovery **cr_ptr,
66c7db68 447 itt_t init_task_tag)
e48354ce
NB		 448{
449 struct iscsi_cmd *cmd = NULL;
450 struct iscsi_conn_recovery *cr;
451 /*
452 * Scan through the inactive connection recovery list's command list.
453 * If init_task_tag matches the command is still alligent.
454 */
455 spin_lock(&sess->cr_i_lock);
456 list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) {
457 spin_lock(&cr->conn_recovery_cmd_lock);
2fbb471e 458 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
e48354ce
NB		 459 if (cmd->init_task_tag == init_task_tag) {
460 spin_unlock(&cr->conn_recovery_cmd_lock);
461 spin_unlock(&sess->cr_i_lock);
462
463 *cr_ptr = cr;
464 *cmd_ptr = cmd;
465 return -2;
466 }
467 }
468 spin_unlock(&cr->conn_recovery_cmd_lock);
469 }
470 spin_unlock(&sess->cr_i_lock);
471 /*
472 * Scan through the active connection recovery list's command list.
473 * If init_task_tag matches the command is ready to be reassigned.
474 */
475 spin_lock(&sess->cr_a_lock);
476 list_for_each_entry(cr, &sess->cr_active_list, cr_list) {
477 spin_lock(&cr->conn_recovery_cmd_lock);
2fbb471e 478 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
e48354ce
NB		 479 if (cmd->init_task_tag == init_task_tag) {
480 spin_unlock(&cr->conn_recovery_cmd_lock);
481 spin_unlock(&sess->cr_a_lock);
482
483 *cr_ptr = cr;
484 *cmd_ptr = cmd;
485 return 0;
486 }
487 }
488 spin_unlock(&cr->conn_recovery_cmd_lock);
489 }
490 spin_unlock(&sess->cr_a_lock);
491
492 return -1;
493}
494
495void iscsit_add_cmd_to_immediate_queue(
496 struct iscsi_cmd *cmd,
497 struct iscsi_conn *conn,
498 u8 state)
499{
500 struct iscsi_queue_req *qr;
501
502 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
503 if (!qr) {
504 pr_err("Unable to allocate memory for"
505 " struct iscsi_queue_req\n");
506 return;
507 }
508 INIT_LIST_HEAD(&qr->qr_list);
509 qr->cmd = cmd;
510 qr->state = state;
511
512 spin_lock_bh(&conn->immed_queue_lock);
513 list_add_tail(&qr->qr_list, &conn->immed_queue_list);
514 atomic_inc(&cmd->immed_queue_count);
515 atomic_set(&conn->check_immediate_queue, 1);
516 spin_unlock_bh(&conn->immed_queue_lock);
517
d5627acb 518 wake_up(&conn->queues_wq);
e48354ce
NB		 519}
520
521struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *conn)
522{
523 struct iscsi_queue_req *qr;
524
525 spin_lock_bh(&conn->immed_queue_lock);
526 if (list_empty(&conn->immed_queue_list)) {
527 spin_unlock_bh(&conn->immed_queue_lock);
528 return NULL;
529 }
1f981de5
RD		 530 qr = list_first_entry(&conn->immed_queue_list,
531 struct iscsi_queue_req, qr_list);
e48354ce
NB		 532
533 list_del(&qr->qr_list);
534 if (qr->cmd)
535 atomic_dec(&qr->cmd->immed_queue_count);
536 spin_unlock_bh(&conn->immed_queue_lock);
537
538 return qr;
539}
540
541static void iscsit_remove_cmd_from_immediate_queue(
542 struct iscsi_cmd *cmd,
543 struct iscsi_conn *conn)
544{
545 struct iscsi_queue_req *qr, *qr_tmp;
546
547 spin_lock_bh(&conn->immed_queue_lock);
548 if (!atomic_read(&cmd->immed_queue_count)) {
549 spin_unlock_bh(&conn->immed_queue_lock);
550 return;
551 }
552
553 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
554 if (qr->cmd != cmd)
555 continue;
556
557 atomic_dec(&qr->cmd->immed_queue_count);
558 list_del(&qr->qr_list);
559 kmem_cache_free(lio_qr_cache, qr);
560 }
561 spin_unlock_bh(&conn->immed_queue_lock);
562
563 if (atomic_read(&cmd->immed_queue_count)) {
564 pr_err("ITT: 0x%08x immed_queue_count: %d\n",
565 cmd->init_task_tag,
566 atomic_read(&cmd->immed_queue_count));
567 }
568}
569
570void iscsit_add_cmd_to_response_queue(
571 struct iscsi_cmd *cmd,
572 struct iscsi_conn *conn,
573 u8 state)
574{
575 struct iscsi_queue_req *qr;
576
577 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
578 if (!qr) {
579 pr_err("Unable to allocate memory for"
580 " struct iscsi_queue_req\n");
581 return;
582 }
583 INIT_LIST_HEAD(&qr->qr_list);
584 qr->cmd = cmd;
585 qr->state = state;
586
587 spin_lock_bh(&conn->response_queue_lock);
588 list_add_tail(&qr->qr_list, &conn->response_queue_list);
589 atomic_inc(&cmd->response_queue_count);
590 spin_unlock_bh(&conn->response_queue_lock);
591
d5627acb 592 wake_up(&conn->queues_wq);
e48354ce
NB		 593}
594
595struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *conn)
596{
597 struct iscsi_queue_req *qr;
598
599 spin_lock_bh(&conn->response_queue_lock);
600 if (list_empty(&conn->response_queue_list)) {
601 spin_unlock_bh(&conn->response_queue_lock);
602 return NULL;
603 }
604
1f981de5
RD		 605 qr = list_first_entry(&conn->response_queue_list,
606 struct iscsi_queue_req, qr_list);
e48354ce
NB		 607
608 list_del(&qr->qr_list);
609 if (qr->cmd)
610 atomic_dec(&qr->cmd->response_queue_count);
611 spin_unlock_bh(&conn->response_queue_lock);
612
613 return qr;
614}
615
616static void iscsit_remove_cmd_from_response_queue(
617 struct iscsi_cmd *cmd,
618 struct iscsi_conn *conn)
619{
620 struct iscsi_queue_req *qr, *qr_tmp;
621
622 spin_lock_bh(&conn->response_queue_lock);
623 if (!atomic_read(&cmd->response_queue_count)) {
624 spin_unlock_bh(&conn->response_queue_lock);
625 return;
626 }
627
628 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
629 qr_list) {
630 if (qr->cmd != cmd)
631 continue;
632
633 atomic_dec(&qr->cmd->response_queue_count);
634 list_del(&qr->qr_list);
635 kmem_cache_free(lio_qr_cache, qr);
636 }
637 spin_unlock_bh(&conn->response_queue_lock);
638
639 if (atomic_read(&cmd->response_queue_count)) {
640 pr_err("ITT: 0x%08x response_queue_count: %d\n",
641 cmd->init_task_tag,
642 atomic_read(&cmd->response_queue_count));
643 }
644}
645
d5627acb
RD		 646bool iscsit_conn_all_queues_empty(struct iscsi_conn *conn)
647{
648 bool empty;
649
650 spin_lock_bh(&conn->immed_queue_lock);
651 empty = list_empty(&conn->immed_queue_list);
652 spin_unlock_bh(&conn->immed_queue_lock);
653
654 if (!empty)
655 return empty;
656
657 spin_lock_bh(&conn->response_queue_lock);
658 empty = list_empty(&conn->response_queue_list);
659 spin_unlock_bh(&conn->response_queue_lock);
660
661 return empty;
662}
663
e48354ce
NB		 664void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn)
665{
666 struct iscsi_queue_req *qr, *qr_tmp;
667
668 spin_lock_bh(&conn->immed_queue_lock);
669 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
670 list_del(&qr->qr_list);
671 if (qr->cmd)
672 atomic_dec(&qr->cmd->immed_queue_count);
673
674 kmem_cache_free(lio_qr_cache, qr);
675 }
676 spin_unlock_bh(&conn->immed_queue_lock);
677
678 spin_lock_bh(&conn->response_queue_lock);
679 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
680 qr_list) {
681 list_del(&qr->qr_list);
682 if (qr->cmd)
683 atomic_dec(&qr->cmd->response_queue_count);
684
685 kmem_cache_free(lio_qr_cache, qr);
686 }
687 spin_unlock_bh(&conn->response_queue_lock);
688}
689
690void iscsit_release_cmd(struct iscsi_cmd *cmd)
691{
e48354ce
NB		 692 kfree(cmd->buf_ptr);
693 kfree(cmd->pdu_list);
694 kfree(cmd->seq_list);
695 kfree(cmd->tmr_req);
696 kfree(cmd->iov_data);
697
aafc9d15
NB		 698 kmem_cache_free(lio_cmd_cache, cmd);
699}
700
701static void __iscsit_free_cmd(struct iscsi_cmd *cmd, bool scsi_cmd,
702 bool check_queues)
703{
704 struct iscsi_conn *conn = cmd->conn;
705
706 if (scsi_cmd) {
707 if (cmd->data_direction == DMA_TO_DEVICE) {
708 iscsit_stop_dataout_timer(cmd);
709 iscsit_free_r2ts_from_list(cmd);
710 }
711 if (cmd->data_direction == DMA_FROM_DEVICE)
712 iscsit_free_all_datain_reqs(cmd);
713 }
714
715 if (conn && check_queues) {
e48354ce
NB		 716 iscsit_remove_cmd_from_immediate_queue(cmd, conn);
717 iscsit_remove_cmd_from_response_queue(cmd, conn);
718 }
e48354ce
NB		 719}
720
aafc9d15 721void iscsit_free_cmd(struct iscsi_cmd *cmd, bool shutdown)
d270190a 722{
aafc9d15
NB		 723 struct se_cmd *se_cmd = NULL;
724 int rc;
e71bfbe7 725 bool op_scsi = false;
d270190a 726 /*
20879696 727 * Determine if a struct se_cmd is associated with
d270190a
NB		 728 * this struct iscsi_cmd.
729 */
730 switch (cmd->iscsi_opcode) {
731 case ISCSI_OP_SCSI_CMD:
e71bfbe7 732 op_scsi = true;
cdb72665
NB		 733 /*
734 * Fallthrough
735 */
d270190a 736 case ISCSI_OP_SCSI_TMFUNC:
e71bfbe7
NB		 737 se_cmd = &cmd->se_cmd;
738 __iscsit_free_cmd(cmd, op_scsi, shutdown);
739 rc = transport_generic_free_cmd(se_cmd, shutdown);
740 if (!rc && shutdown && se_cmd->se_sess) {
741 __iscsit_free_cmd(cmd, op_scsi, shutdown);
aafc9d15
NB		 742 target_put_sess_cmd(se_cmd->se_sess, se_cmd);
743 }
d270190a 744 break;
c1ce4bd5
NB		 745 case ISCSI_OP_REJECT:
746 /*
747 * Handle special case for REJECT when iscsi_add_reject*() has
748 * overwritten the original iscsi_opcode assignment, and the
749 * associated cmd->se_cmd needs to be released.
750 */
751 if (cmd->se_cmd.se_tfo != NULL) {
aafc9d15
NB		 752 se_cmd = &cmd->se_cmd;
753 __iscsit_free_cmd(cmd, true, shutdown);
754
a0348152 755 rc = transport_generic_free_cmd(&cmd->se_cmd, shutdown);
aafc9d15
NB		 756 if (!rc && shutdown && se_cmd->se_sess) {
757 __iscsit_free_cmd(cmd, true, shutdown);
758 target_put_sess_cmd(se_cmd->se_sess, se_cmd);
759 }
c1ce4bd5
NB		 760 break;
761 }
762 /* Fall-through */
d270190a 763 default:
aafc9d15 764 __iscsit_free_cmd(cmd, false, shutdown);
cdb72665 765 cmd->release_cmd(cmd);
d270190a
NB		 766 break;
767 }
768}
769
e48354ce
NB		 770int iscsit_check_session_usage_count(struct iscsi_session *sess)
771{
772 spin_lock_bh(&sess->session_usage_lock);
773 if (sess->session_usage_count != 0) {
774 sess->session_waiting_on_uc = 1;
775 spin_unlock_bh(&sess->session_usage_lock);
776 if (in_interrupt())
777 return 2;
778
779 wait_for_completion(&sess->session_waiting_on_uc_comp);
780 return 1;
781 }
782 spin_unlock_bh(&sess->session_usage_lock);
783
784 return 0;
785}
786
787void iscsit_dec_session_usage_count(struct iscsi_session *sess)
788{
789 spin_lock_bh(&sess->session_usage_lock);
790 sess->session_usage_count--;
791
792 if (!sess->session_usage_count && sess->session_waiting_on_uc)
793 complete(&sess->session_waiting_on_uc_comp);
794
795 spin_unlock_bh(&sess->session_usage_lock);
796}
797
798void iscsit_inc_session_usage_count(struct iscsi_session *sess)
799{
800 spin_lock_bh(&sess->session_usage_lock);
801 sess->session_usage_count++;
802 spin_unlock_bh(&sess->session_usage_lock);
803}
804
e48354ce
NB		 805/*
806 * Setup conn->if_marker and conn->of_marker values based upon
807 * the initial marker-less interval. (see iSCSI v19 A.2)
808 */
809int iscsit_set_sync_and_steering_values(struct iscsi_conn *conn)
810{
811 int login_ifmarker_count = 0, login_ofmarker_count = 0, next_marker = 0;
812 /*
813 * IFMarkInt and OFMarkInt are negotiated as 32-bit words.
814 */
815 u32 IFMarkInt = (conn->conn_ops->IFMarkInt * 4);
816 u32 OFMarkInt = (conn->conn_ops->OFMarkInt * 4);
817
818 if (conn->conn_ops->OFMarker) {
819 /*
820 * Account for the first Login Command received not
821 * via iscsi_recv_msg().
822 */
823 conn->of_marker += ISCSI_HDR_LEN;
824 if (conn->of_marker <= OFMarkInt) {
825 conn->of_marker = (OFMarkInt - conn->of_marker);
826 } else {
827 login_ofmarker_count = (conn->of_marker / OFMarkInt);
828 next_marker = (OFMarkInt * (login_ofmarker_count + 1)) +
829 (login_ofmarker_count * MARKER_SIZE);
830 conn->of_marker = (next_marker - conn->of_marker);
831 }
832 conn->of_marker_offset = 0;
833 pr_debug("Setting OFMarker value to %u based on Initial"
834 " Markerless Interval.\n", conn->of_marker);
835 }
836
837 if (conn->conn_ops->IFMarker) {
838 if (conn->if_marker <= IFMarkInt) {
839 conn->if_marker = (IFMarkInt - conn->if_marker);
840 } else {
841 login_ifmarker_count = (conn->if_marker / IFMarkInt);
842 next_marker = (IFMarkInt * (login_ifmarker_count + 1)) +
843 (login_ifmarker_count * MARKER_SIZE);
844 conn->if_marker = (next_marker - conn->if_marker);
845 }
846 pr_debug("Setting IFMarker value to %u based on Initial"
847 " Markerless Interval.\n", conn->if_marker);
848 }
849
850 return 0;
851}
852
853struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid)
854{
855 struct iscsi_conn *conn;
856
857 spin_lock_bh(&sess->conn_lock);
858 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
859 if ((conn->cid == cid) &&
860 (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) {
861 iscsit_inc_conn_usage_count(conn);
862 spin_unlock_bh(&sess->conn_lock);
863 return conn;
864 }
865 }
866 spin_unlock_bh(&sess->conn_lock);
867
868 return NULL;
869}
870
871struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid)
872{
873 struct iscsi_conn *conn;
874
875 spin_lock_bh(&sess->conn_lock);
876 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
877 if (conn->cid == cid) {
878 iscsit_inc_conn_usage_count(conn);
879 spin_lock(&conn->state_lock);
880 atomic_set(&conn->connection_wait_rcfr, 1);
881 spin_unlock(&conn->state_lock);
882 spin_unlock_bh(&sess->conn_lock);
883 return conn;
884 }
885 }
886 spin_unlock_bh(&sess->conn_lock);
887
888 return NULL;
889}
890
891void iscsit_check_conn_usage_count(struct iscsi_conn *conn)
892{
893 spin_lock_bh(&conn->conn_usage_lock);
894 if (conn->conn_usage_count != 0) {
895 conn->conn_waiting_on_uc = 1;
896 spin_unlock_bh(&conn->conn_usage_lock);
897
898 wait_for_completion(&conn->conn_waiting_on_uc_comp);
899 return;
900 }
901 spin_unlock_bh(&conn->conn_usage_lock);
902}
903
904void iscsit_dec_conn_usage_count(struct iscsi_conn *conn)
905{
906 spin_lock_bh(&conn->conn_usage_lock);
907 conn->conn_usage_count--;
908
909 if (!conn->conn_usage_count && conn->conn_waiting_on_uc)
910 complete(&conn->conn_waiting_on_uc_comp);
911
912 spin_unlock_bh(&conn->conn_usage_lock);
913}
914
915void iscsit_inc_conn_usage_count(struct iscsi_conn *conn)
916{
917 spin_lock_bh(&conn->conn_usage_lock);
918 conn->conn_usage_count++;
919 spin_unlock_bh(&conn->conn_usage_lock);
920}
921
922static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response)
923{
924 u8 state;
925 struct iscsi_cmd *cmd;
926
927 cmd = iscsit_allocate_cmd(conn, GFP_ATOMIC);
928 if (!cmd)
929 return -1;
930
931 cmd->iscsi_opcode = ISCSI_OP_NOOP_IN;
932 state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE :
933 ISTATE_SEND_NOPIN_NO_RESPONSE;
66c7db68 934 cmd->init_task_tag = RESERVED_ITT;
e48354ce
NB		 935 spin_lock_bh(&conn->sess->ttt_lock);
936 cmd->targ_xfer_tag = (want_response) ? conn->sess->targ_xfer_tag++ :
937 0xFFFFFFFF;
938 if (want_response && (cmd->targ_xfer_tag == 0xFFFFFFFF))
939 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
940 spin_unlock_bh(&conn->sess->ttt_lock);
941
942 spin_lock_bh(&conn->cmd_lock);
2fbb471e 943 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 944 spin_unlock_bh(&conn->cmd_lock);
945
946 if (want_response)
947 iscsit_start_nopin_response_timer(conn);
948 iscsit_add_cmd_to_immediate_queue(cmd, conn, state);
949
950 return 0;
951}
952
953static void iscsit_handle_nopin_response_timeout(unsigned long data)
954{
955 struct iscsi_conn *conn = (struct iscsi_conn *) data;
956
957 iscsit_inc_conn_usage_count(conn);
958
959 spin_lock_bh(&conn->nopin_timer_lock);
960 if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) {
961 spin_unlock_bh(&conn->nopin_timer_lock);
962 iscsit_dec_conn_usage_count(conn);
963 return;
964 }
965
966 pr_debug("Did not receive response to NOPIN on CID: %hu on"
967 " SID: %u, failing connection.\n", conn->cid,
968 conn->sess->sid);
969 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
970 spin_unlock_bh(&conn->nopin_timer_lock);
971
972 {
973 struct iscsi_portal_group *tpg = conn->sess->tpg;
974 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
975
976 if (tiqn) {
977 spin_lock_bh(&tiqn->sess_err_stats.lock);
978 strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
8359cf43 979 conn->sess->sess_ops->InitiatorName);
e48354ce
NB		 980 tiqn->sess_err_stats.last_sess_failure_type =
981 ISCSI_SESS_ERR_CXN_TIMEOUT;
982 tiqn->sess_err_stats.cxn_timeout_errors++;
983 conn->sess->conn_timeout_errors++;
984 spin_unlock_bh(&tiqn->sess_err_stats.lock);
985 }
986 }
987
988 iscsit_cause_connection_reinstatement(conn, 0);
989 iscsit_dec_conn_usage_count(conn);
990}
991
992void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn)
993{
994 struct iscsi_session *sess = conn->sess;
995 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
996
997 spin_lock_bh(&conn->nopin_timer_lock);
998 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
999 spin_unlock_bh(&conn->nopin_timer_lock);
1000 return;
1001 }
1002
1003 mod_timer(&conn->nopin_response_timer,
1004 (get_jiffies_64() + na->nopin_response_timeout * HZ));
1005 spin_unlock_bh(&conn->nopin_timer_lock);
1006}
1007
1008/*
1009 * Called with conn->nopin_timer_lock held.
1010 */
1011void iscsit_start_nopin_response_timer(struct iscsi_conn *conn)
1012{
1013 struct iscsi_session *sess = conn->sess;
1014 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1015
1016 spin_lock_bh(&conn->nopin_timer_lock);
1017 if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) {
1018 spin_unlock_bh(&conn->nopin_timer_lock);
1019 return;
1020 }
1021
1022 init_timer(&conn->nopin_response_timer);
1023 conn->nopin_response_timer.expires =
1024 (get_jiffies_64() + na->nopin_response_timeout * HZ);
1025 conn->nopin_response_timer.data = (unsigned long)conn;
1026 conn->nopin_response_timer.function = iscsit_handle_nopin_response_timeout;
1027 conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP;
1028 conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING;
1029 add_timer(&conn->nopin_response_timer);
1030
1031 pr_debug("Started NOPIN Response Timer on CID: %d to %u"
1032 " seconds\n", conn->cid, na->nopin_response_timeout);
1033 spin_unlock_bh(&conn->nopin_timer_lock);
1034}
1035
1036void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn)
1037{
1038 spin_lock_bh(&conn->nopin_timer_lock);
1039 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
1040 spin_unlock_bh(&conn->nopin_timer_lock);
1041 return;
1042 }
1043 conn->nopin_response_timer_flags |= ISCSI_TF_STOP;
1044 spin_unlock_bh(&conn->nopin_timer_lock);
1045
1046 del_timer_sync(&conn->nopin_response_timer);
1047
1048 spin_lock_bh(&conn->nopin_timer_lock);
1049 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
1050 spin_unlock_bh(&conn->nopin_timer_lock);
1051}
1052
1053static void iscsit_handle_nopin_timeout(unsigned long data)
1054{
1055 struct iscsi_conn *conn = (struct iscsi_conn *) data;
1056
1057 iscsit_inc_conn_usage_count(conn);
1058
1059 spin_lock_bh(&conn->nopin_timer_lock);
1060 if (conn->nopin_timer_flags & ISCSI_TF_STOP) {
1061 spin_unlock_bh(&conn->nopin_timer_lock);
1062 iscsit_dec_conn_usage_count(conn);
1063 return;
1064 }
1065 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1066 spin_unlock_bh(&conn->nopin_timer_lock);
1067
1068 iscsit_add_nopin(conn, 1);
1069 iscsit_dec_conn_usage_count(conn);
1070}
1071
1072/*
1073 * Called with conn->nopin_timer_lock held.
1074 */
1075void __iscsit_start_nopin_timer(struct iscsi_conn *conn)
1076{
1077 struct iscsi_session *sess = conn->sess;
1078 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1079 /*
1080 * NOPIN timeout is disabled.
1081 */
1082 if (!na->nopin_timeout)
1083 return;
1084
1085 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING)
1086 return;
1087
1088 init_timer(&conn->nopin_timer);
1089 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1090 conn->nopin_timer.data = (unsigned long)conn;
1091 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1092 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1093 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1094 add_timer(&conn->nopin_timer);
1095
1096 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1097 " interval\n", conn->cid, na->nopin_timeout);
1098}
1099
1100void iscsit_start_nopin_timer(struct iscsi_conn *conn)
1101{
1102 struct iscsi_session *sess = conn->sess;
1103 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1104 /*
1105 * NOPIN timeout is disabled..
1106 */
1107 if (!na->nopin_timeout)
1108 return;
1109
1110 spin_lock_bh(&conn->nopin_timer_lock);
1111 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) {
1112 spin_unlock_bh(&conn->nopin_timer_lock);
1113 return;
1114 }
1115
1116 init_timer(&conn->nopin_timer);
1117 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1118 conn->nopin_timer.data = (unsigned long)conn;
1119 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1120 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1121 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1122 add_timer(&conn->nopin_timer);
1123
1124 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1125 " interval\n", conn->cid, na->nopin_timeout);
1126 spin_unlock_bh(&conn->nopin_timer_lock);
1127}
1128
1129void iscsit_stop_nopin_timer(struct iscsi_conn *conn)
1130{
1131 spin_lock_bh(&conn->nopin_timer_lock);
1132 if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) {
1133 spin_unlock_bh(&conn->nopin_timer_lock);
1134 return;
1135 }
1136 conn->nopin_timer_flags |= ISCSI_TF_STOP;
1137 spin_unlock_bh(&conn->nopin_timer_lock);
1138
1139 del_timer_sync(&conn->nopin_timer);
1140
1141 spin_lock_bh(&conn->nopin_timer_lock);
1142 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1143 spin_unlock_bh(&conn->nopin_timer_lock);
1144}
1145
1146int iscsit_send_tx_data(
1147 struct iscsi_cmd *cmd,
1148 struct iscsi_conn *conn,
1149 int use_misc)
1150{
1151 int tx_sent, tx_size;
1152 u32 iov_count;
1153 struct kvec *iov;
1154
1155send_data:
1156 tx_size = cmd->tx_size;
1157
1158 if (!use_misc) {
1159 iov = &cmd->iov_data[0];
1160 iov_count = cmd->iov_data_count;
1161 } else {
1162 iov = &cmd->iov_misc[0];
1163 iov_count = cmd->iov_misc_count;
1164 }
1165
1166 tx_sent = tx_data(conn, &iov[0], iov_count, tx_size);
1167 if (tx_size != tx_sent) {
1168 if (tx_sent == -EAGAIN) {
1169 pr_err("tx_data() returned -EAGAIN\n");
1170 goto send_data;
1171 } else
1172 return -1;
1173 }
1174 cmd->tx_size = 0;
1175
1176 return 0;
1177}
1178
1179int iscsit_fe_sendpage_sg(
1180 struct iscsi_cmd *cmd,
1181 struct iscsi_conn *conn)
1182{
1183 struct scatterlist *sg = cmd->first_data_sg;
1184 struct kvec iov;
1185 u32 tx_hdr_size, data_len;
1186 u32 offset = cmd->first_data_sg_off;
40b05497 1187 int tx_sent, iov_off;
e48354ce
NB		 1188
1189send_hdr:
1190 tx_hdr_size = ISCSI_HDR_LEN;
1191 if (conn->conn_ops->HeaderDigest)
1192 tx_hdr_size += ISCSI_CRC_LEN;
1193
1194 iov.iov_base = cmd->pdu;
1195 iov.iov_len = tx_hdr_size;
1196
1197 tx_sent = tx_data(conn, &iov, 1, tx_hdr_size);
1198 if (tx_hdr_size != tx_sent) {
1199 if (tx_sent == -EAGAIN) {
1200 pr_err("tx_data() returned -EAGAIN\n");
1201 goto send_hdr;
1202 }
1203 return -1;
1204 }
1205
1206 data_len = cmd->tx_size - tx_hdr_size - cmd->padding;
40b05497
NB		 1207 /*
1208 * Set iov_off used by padding and data digest tx_data() calls below
1209 * in order to determine proper offset into cmd->iov_data[]
1210 */
1211 if (conn->conn_ops->DataDigest) {
e48354ce 1212 data_len -= ISCSI_CRC_LEN;
40b05497
NB		 1213 if (cmd->padding)
1214 iov_off = (cmd->iov_data_count - 2);
1215 else
1216 iov_off = (cmd->iov_data_count - 1);
1217 } else {
1218 iov_off = (cmd->iov_data_count - 1);
1219 }
e48354ce
NB		 1220 /*
1221 * Perform sendpage() for each page in the scatterlist
1222 */
1223 while (data_len) {
1224 u32 space = (sg->length - offset);
1225 u32 sub_len = min_t(u32, data_len, space);
1226send_pg:
1227 tx_sent = conn->sock->ops->sendpage(conn->sock,
1228 sg_page(sg), sg->offset + offset, sub_len, 0);
1229 if (tx_sent != sub_len) {
1230 if (tx_sent == -EAGAIN) {
1231 pr_err("tcp_sendpage() returned"
1232 " -EAGAIN\n");
1233 goto send_pg;
1234 }
1235
1236 pr_err("tcp_sendpage() failure: %d\n",
1237 tx_sent);
1238 return -1;
1239 }
1240
1241 data_len -= sub_len;
1242 offset = 0;
1243 sg = sg_next(sg);
1244 }
1245
1246send_padding:
1247 if (cmd->padding) {
40b05497 1248 struct kvec *iov_p = &cmd->iov_data[iov_off++];
e48354ce
NB		 1249
1250 tx_sent = tx_data(conn, iov_p, 1, cmd->padding);
1251 if (cmd->padding != tx_sent) {
1252 if (tx_sent == -EAGAIN) {
1253 pr_err("tx_data() returned -EAGAIN\n");
1254 goto send_padding;
1255 }
1256 return -1;
1257 }
1258 }
1259
1260send_datacrc:
1261 if (conn->conn_ops->DataDigest) {
40b05497 1262 struct kvec *iov_d = &cmd->iov_data[iov_off];
e48354ce
NB		 1263
1264 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN);
1265 if (ISCSI_CRC_LEN != tx_sent) {
1266 if (tx_sent == -EAGAIN) {
1267 pr_err("tx_data() returned -EAGAIN\n");
1268 goto send_datacrc;
1269 }
1270 return -1;
1271 }
1272 }
1273
1274 return 0;
1275}
1276
1277/*
1278 * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU
1279 * back to the Initiator when an expection condition occurs with the
1280 * errors set in status_class and status_detail.
1281 *
1282 * Parameters: iSCSI Connection, Status Class, Status Detail.
1283 * Returns: 0 on success, -1 on error.
1284 */
1285int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail)
1286{
e48354ce 1287 struct iscsi_login_rsp *hdr;
baa4d64b 1288 struct iscsi_login *login = conn->conn_login;
e48354ce 1289
baa4d64b 1290 login->login_failed = 1;
e48354ce
NB		 1291 iscsit_collect_login_stats(conn, status_class, status_detail);
1292
d2613415
NB		 1293 memset(&login->rsp[0], 0, ISCSI_HDR_LEN);
1294
baa4d64b 1295 hdr = (struct iscsi_login_rsp *)&login->rsp[0];
e48354ce
NB		 1296 hdr->opcode = ISCSI_OP_LOGIN_RSP;
1297 hdr->status_class = status_class;
1298 hdr->status_detail = status_detail;
66c7db68 1299 hdr->itt = conn->login_itt;
e48354ce 1300
baa4d64b 1301 return conn->conn_transport->iscsit_put_login_tx(conn, login, 0);
e48354ce
NB		 1302}
1303
1304void 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
1318static 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;
2ff017f5 1323 struct kvec *iov_p;
e48354ce
NB		 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
2ff017f5
NB		 1331 iov_p = count->iov;
1332 iov_len = count->iov_count;
e48354ce
NB		 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
e48354ce
NB		 1347 return total_rx;
1348}
1349
1350static int iscsit_do_tx_data(
1351 struct iscsi_conn *conn,
1352 struct iscsi_data_count *count)
1353{
d59bebb4 1354 int ret, iov_len;
2ff017f5 1355 struct kvec *iov_p;
e48354ce
NB		 1356 struct msghdr msg;
1357
1358 if (!conn || !conn->sock || !conn->conn_ops)
1359 return -1;
1360
d59bebb4
NB		 1361 if (count->data_length <= 0) {
1362 pr_err("Data length is: %d\n", count->data_length);
e48354ce
NB		 1363 return -1;
1364 }
1365
1366 memset(&msg, 0, sizeof(struct msghdr));
1367
2ff017f5
NB		 1368 iov_p = count->iov;
1369 iov_len = count->iov_count;
e48354ce 1370
d59bebb4
NB		 1371 ret = kernel_sendmsg(conn->sock, &msg, iov_p, iov_len,
1372 count->data_length);
1373 if (ret != count->data_length) {
1374 pr_err("Unexpected ret: %d send data %d\n",
1375 ret, count->data_length);
1376 return -EPIPE;
e48354ce 1377 }
d59bebb4 1378 pr_debug("ret: %d, sent data: %d\n", ret, count->data_length);
e48354ce 1379
d59bebb4 1380 return ret;
e48354ce
NB		 1381}
1382
1383int rx_data(
1384 struct iscsi_conn *conn,
1385 struct kvec *iov,
1386 int iov_count,
1387 int data)
1388{
1389 struct iscsi_data_count c;
1390
1391 if (!conn || !conn->sock || !conn->conn_ops)
1392 return -1;
1393
1394 memset(&c, 0, sizeof(struct iscsi_data_count));
1395 c.iov = iov;
1396 c.iov_count = iov_count;
1397 c.data_length = data;
1398 c.type = ISCSI_RX_DATA;
1399
e48354ce
NB		 1400 return iscsit_do_rx_data(conn, &c);
1401}
1402
1403int tx_data(
1404 struct iscsi_conn *conn,
1405 struct kvec *iov,
1406 int iov_count,
1407 int data)
1408{
1409 struct iscsi_data_count c;
1410
1411 if (!conn || !conn->sock || !conn->conn_ops)
1412 return -1;
1413
1414 memset(&c, 0, sizeof(struct iscsi_data_count));
1415 c.iov = iov;
1416 c.iov_count = iov_count;
1417 c.data_length = data;
1418 c.type = ISCSI_TX_DATA;
1419
e48354ce
NB		 1420 return iscsit_do_tx_data(conn, &c);
1421}
1422
1423void iscsit_collect_login_stats(
1424 struct iscsi_conn *conn,
1425 u8 status_class,
1426 u8 status_detail)
1427{
1428 struct iscsi_param *intrname = NULL;
1429 struct iscsi_tiqn *tiqn;
1430 struct iscsi_login_stats *ls;
1431
1432 tiqn = iscsit_snmp_get_tiqn(conn);
1433 if (!tiqn)
1434 return;
1435
1436 ls = &tiqn->login_stats;
1437
1438 spin_lock(&ls->lock);
1439 if (!strcmp(conn->login_ip, ls->last_intr_fail_ip_addr) &&
1440 ((get_jiffies_64() - ls->last_fail_time) < 10)) {
1441 /* We already have the failure info for this login */
1442 spin_unlock(&ls->lock);
1443 return;
1444 }
1445
1446 if (status_class == ISCSI_STATUS_CLS_SUCCESS)
1447 ls->accepts++;
1448 else if (status_class == ISCSI_STATUS_CLS_REDIRECT) {
1449 ls->redirects++;
1450 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT;
1451 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1452 (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) {
1453 ls->authenticate_fails++;
1454 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE;
1455 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1456 (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) {
1457 ls->authorize_fails++;
1458 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE;
1459 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1460 (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) {
1461 ls->negotiate_fails++;
1462 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE;
1463 } else {
1464 ls->other_fails++;
1465 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER;
1466 }
1467
1468 /* Save initiator name, ip address and time, if it is a failed login */
1469 if (status_class != ISCSI_STATUS_CLS_SUCCESS) {
1470 if (conn->param_list)
1471 intrname = iscsi_find_param_from_key(INITIATORNAME,
1472 conn->param_list);
1473 strcpy(ls->last_intr_fail_name,
1474 (intrname ? intrname->value : "Unknown"));
1475
baa4d64b
NB		 1476 ls->last_intr_fail_ip_family = conn->login_family;
1477
e48354ce
NB		 1478 snprintf(ls->last_intr_fail_ip_addr, IPV6_ADDRESS_SPACE,
1479 "%s", conn->login_ip);
1480 ls->last_fail_time = get_jiffies_64();
1481 }
1482
1483 spin_unlock(&ls->lock);
1484}
1485
1486struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn)
1487{
1488 struct iscsi_portal_group *tpg;
1489
1490 if (!conn || !conn->sess)
1491 return NULL;
1492
1493 tpg = conn->sess->tpg;
1494 if (!tpg)
1495 return NULL;
1496
1497 if (!tpg->tpg_tiqn)
1498 return NULL;
1499
1500 return tpg->tpg_tiqn;
1501}
kernel source for telekom puls (alcatel/mediatek)