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iscsi-target: Explicily clear login response PDU in exception path
[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;
d270190a 725 /*
20879696 726 * Determine if a struct se_cmd is associated with
d270190a
NB		 727 * this struct iscsi_cmd.
728 */
729 switch (cmd->iscsi_opcode) {
730 case ISCSI_OP_SCSI_CMD:
aafc9d15
NB		 731 se_cmd = &cmd->se_cmd;
732 __iscsit_free_cmd(cmd, true, shutdown);
cdb72665
NB		 733 /*
734 * Fallthrough
735 */
d270190a 736 case ISCSI_OP_SCSI_TMFUNC:
a0348152 737 rc = transport_generic_free_cmd(&cmd->se_cmd, shutdown);
aafc9d15
NB		 738 if (!rc && shutdown && se_cmd && se_cmd->se_sess) {
739 __iscsit_free_cmd(cmd, true, shutdown);
740 target_put_sess_cmd(se_cmd->se_sess, se_cmd);
741 }
d270190a 742 break;
c1ce4bd5
NB		 743 case ISCSI_OP_REJECT:
744 /*
745 * Handle special case for REJECT when iscsi_add_reject*() has
746 * overwritten the original iscsi_opcode assignment, and the
747 * associated cmd->se_cmd needs to be released.
748 */
749 if (cmd->se_cmd.se_tfo != NULL) {
aafc9d15
NB		 750 se_cmd = &cmd->se_cmd;
751 __iscsit_free_cmd(cmd, true, shutdown);
752
a0348152 753 rc = transport_generic_free_cmd(&cmd->se_cmd, shutdown);
aafc9d15
NB		 754 if (!rc && shutdown && se_cmd->se_sess) {
755 __iscsit_free_cmd(cmd, true, shutdown);
756 target_put_sess_cmd(se_cmd->se_sess, se_cmd);
757 }
c1ce4bd5
NB		 758 break;
759 }
760 /* Fall-through */
d270190a 761 default:
aafc9d15 762 __iscsit_free_cmd(cmd, false, shutdown);
cdb72665 763 cmd->release_cmd(cmd);
d270190a
NB		 764 break;
765 }
766}
767
e48354ce
NB		 768int iscsit_check_session_usage_count(struct iscsi_session *sess)
769{
770 spin_lock_bh(&sess->session_usage_lock);
771 if (sess->session_usage_count != 0) {
772 sess->session_waiting_on_uc = 1;
773 spin_unlock_bh(&sess->session_usage_lock);
774 if (in_interrupt())
775 return 2;
776
777 wait_for_completion(&sess->session_waiting_on_uc_comp);
778 return 1;
779 }
780 spin_unlock_bh(&sess->session_usage_lock);
781
782 return 0;
783}
784
785void iscsit_dec_session_usage_count(struct iscsi_session *sess)
786{
787 spin_lock_bh(&sess->session_usage_lock);
788 sess->session_usage_count--;
789
790 if (!sess->session_usage_count && sess->session_waiting_on_uc)
791 complete(&sess->session_waiting_on_uc_comp);
792
793 spin_unlock_bh(&sess->session_usage_lock);
794}
795
796void iscsit_inc_session_usage_count(struct iscsi_session *sess)
797{
798 spin_lock_bh(&sess->session_usage_lock);
799 sess->session_usage_count++;
800 spin_unlock_bh(&sess->session_usage_lock);
801}
802
e48354ce
NB		 803/*
804 * Setup conn->if_marker and conn->of_marker values based upon
805 * the initial marker-less interval. (see iSCSI v19 A.2)
806 */
807int iscsit_set_sync_and_steering_values(struct iscsi_conn *conn)
808{
809 int login_ifmarker_count = 0, login_ofmarker_count = 0, next_marker = 0;
810 /*
811 * IFMarkInt and OFMarkInt are negotiated as 32-bit words.
812 */
813 u32 IFMarkInt = (conn->conn_ops->IFMarkInt * 4);
814 u32 OFMarkInt = (conn->conn_ops->OFMarkInt * 4);
815
816 if (conn->conn_ops->OFMarker) {
817 /*
818 * Account for the first Login Command received not
819 * via iscsi_recv_msg().
820 */
821 conn->of_marker += ISCSI_HDR_LEN;
822 if (conn->of_marker <= OFMarkInt) {
823 conn->of_marker = (OFMarkInt - conn->of_marker);
824 } else {
825 login_ofmarker_count = (conn->of_marker / OFMarkInt);
826 next_marker = (OFMarkInt * (login_ofmarker_count + 1)) +
827 (login_ofmarker_count * MARKER_SIZE);
828 conn->of_marker = (next_marker - conn->of_marker);
829 }
830 conn->of_marker_offset = 0;
831 pr_debug("Setting OFMarker value to %u based on Initial"
832 " Markerless Interval.\n", conn->of_marker);
833 }
834
835 if (conn->conn_ops->IFMarker) {
836 if (conn->if_marker <= IFMarkInt) {
837 conn->if_marker = (IFMarkInt - conn->if_marker);
838 } else {
839 login_ifmarker_count = (conn->if_marker / IFMarkInt);
840 next_marker = (IFMarkInt * (login_ifmarker_count + 1)) +
841 (login_ifmarker_count * MARKER_SIZE);
842 conn->if_marker = (next_marker - conn->if_marker);
843 }
844 pr_debug("Setting IFMarker value to %u based on Initial"
845 " Markerless Interval.\n", conn->if_marker);
846 }
847
848 return 0;
849}
850
851struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid)
852{
853 struct iscsi_conn *conn;
854
855 spin_lock_bh(&sess->conn_lock);
856 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
857 if ((conn->cid == cid) &&
858 (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) {
859 iscsit_inc_conn_usage_count(conn);
860 spin_unlock_bh(&sess->conn_lock);
861 return conn;
862 }
863 }
864 spin_unlock_bh(&sess->conn_lock);
865
866 return NULL;
867}
868
869struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid)
870{
871 struct iscsi_conn *conn;
872
873 spin_lock_bh(&sess->conn_lock);
874 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
875 if (conn->cid == cid) {
876 iscsit_inc_conn_usage_count(conn);
877 spin_lock(&conn->state_lock);
878 atomic_set(&conn->connection_wait_rcfr, 1);
879 spin_unlock(&conn->state_lock);
880 spin_unlock_bh(&sess->conn_lock);
881 return conn;
882 }
883 }
884 spin_unlock_bh(&sess->conn_lock);
885
886 return NULL;
887}
888
889void iscsit_check_conn_usage_count(struct iscsi_conn *conn)
890{
891 spin_lock_bh(&conn->conn_usage_lock);
892 if (conn->conn_usage_count != 0) {
893 conn->conn_waiting_on_uc = 1;
894 spin_unlock_bh(&conn->conn_usage_lock);
895
896 wait_for_completion(&conn->conn_waiting_on_uc_comp);
897 return;
898 }
899 spin_unlock_bh(&conn->conn_usage_lock);
900}
901
902void iscsit_dec_conn_usage_count(struct iscsi_conn *conn)
903{
904 spin_lock_bh(&conn->conn_usage_lock);
905 conn->conn_usage_count--;
906
907 if (!conn->conn_usage_count && conn->conn_waiting_on_uc)
908 complete(&conn->conn_waiting_on_uc_comp);
909
910 spin_unlock_bh(&conn->conn_usage_lock);
911}
912
913void iscsit_inc_conn_usage_count(struct iscsi_conn *conn)
914{
915 spin_lock_bh(&conn->conn_usage_lock);
916 conn->conn_usage_count++;
917 spin_unlock_bh(&conn->conn_usage_lock);
918}
919
920static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response)
921{
922 u8 state;
923 struct iscsi_cmd *cmd;
924
925 cmd = iscsit_allocate_cmd(conn, GFP_ATOMIC);
926 if (!cmd)
927 return -1;
928
929 cmd->iscsi_opcode = ISCSI_OP_NOOP_IN;
930 state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE :
931 ISTATE_SEND_NOPIN_NO_RESPONSE;
66c7db68 932 cmd->init_task_tag = RESERVED_ITT;
e48354ce
NB		 933 spin_lock_bh(&conn->sess->ttt_lock);
934 cmd->targ_xfer_tag = (want_response) ? conn->sess->targ_xfer_tag++ :
935 0xFFFFFFFF;
936 if (want_response && (cmd->targ_xfer_tag == 0xFFFFFFFF))
937 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
938 spin_unlock_bh(&conn->sess->ttt_lock);
939
940 spin_lock_bh(&conn->cmd_lock);
2fbb471e 941 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 942 spin_unlock_bh(&conn->cmd_lock);
943
944 if (want_response)
945 iscsit_start_nopin_response_timer(conn);
946 iscsit_add_cmd_to_immediate_queue(cmd, conn, state);
947
948 return 0;
949}
950
951static void iscsit_handle_nopin_response_timeout(unsigned long data)
952{
953 struct iscsi_conn *conn = (struct iscsi_conn *) data;
954
955 iscsit_inc_conn_usage_count(conn);
956
957 spin_lock_bh(&conn->nopin_timer_lock);
958 if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) {
959 spin_unlock_bh(&conn->nopin_timer_lock);
960 iscsit_dec_conn_usage_count(conn);
961 return;
962 }
963
964 pr_debug("Did not receive response to NOPIN on CID: %hu on"
965 " SID: %u, failing connection.\n", conn->cid,
966 conn->sess->sid);
967 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
968 spin_unlock_bh(&conn->nopin_timer_lock);
969
970 {
971 struct iscsi_portal_group *tpg = conn->sess->tpg;
972 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
973
974 if (tiqn) {
975 spin_lock_bh(&tiqn->sess_err_stats.lock);
976 strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
8359cf43 977 conn->sess->sess_ops->InitiatorName);
e48354ce
NB		 978 tiqn->sess_err_stats.last_sess_failure_type =
979 ISCSI_SESS_ERR_CXN_TIMEOUT;
980 tiqn->sess_err_stats.cxn_timeout_errors++;
981 conn->sess->conn_timeout_errors++;
982 spin_unlock_bh(&tiqn->sess_err_stats.lock);
983 }
984 }
985
986 iscsit_cause_connection_reinstatement(conn, 0);
987 iscsit_dec_conn_usage_count(conn);
988}
989
990void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn)
991{
992 struct iscsi_session *sess = conn->sess;
993 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
994
995 spin_lock_bh(&conn->nopin_timer_lock);
996 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
997 spin_unlock_bh(&conn->nopin_timer_lock);
998 return;
999 }
1000
1001 mod_timer(&conn->nopin_response_timer,
1002 (get_jiffies_64() + na->nopin_response_timeout * HZ));
1003 spin_unlock_bh(&conn->nopin_timer_lock);
1004}
1005
1006/*
1007 * Called with conn->nopin_timer_lock held.
1008 */
1009void iscsit_start_nopin_response_timer(struct iscsi_conn *conn)
1010{
1011 struct iscsi_session *sess = conn->sess;
1012 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1013
1014 spin_lock_bh(&conn->nopin_timer_lock);
1015 if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) {
1016 spin_unlock_bh(&conn->nopin_timer_lock);
1017 return;
1018 }
1019
1020 init_timer(&conn->nopin_response_timer);
1021 conn->nopin_response_timer.expires =
1022 (get_jiffies_64() + na->nopin_response_timeout * HZ);
1023 conn->nopin_response_timer.data = (unsigned long)conn;
1024 conn->nopin_response_timer.function = iscsit_handle_nopin_response_timeout;
1025 conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP;
1026 conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING;
1027 add_timer(&conn->nopin_response_timer);
1028
1029 pr_debug("Started NOPIN Response Timer on CID: %d to %u"
1030 " seconds\n", conn->cid, na->nopin_response_timeout);
1031 spin_unlock_bh(&conn->nopin_timer_lock);
1032}
1033
1034void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn)
1035{
1036 spin_lock_bh(&conn->nopin_timer_lock);
1037 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
1038 spin_unlock_bh(&conn->nopin_timer_lock);
1039 return;
1040 }
1041 conn->nopin_response_timer_flags |= ISCSI_TF_STOP;
1042 spin_unlock_bh(&conn->nopin_timer_lock);
1043
1044 del_timer_sync(&conn->nopin_response_timer);
1045
1046 spin_lock_bh(&conn->nopin_timer_lock);
1047 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
1048 spin_unlock_bh(&conn->nopin_timer_lock);
1049}
1050
1051static void iscsit_handle_nopin_timeout(unsigned long data)
1052{
1053 struct iscsi_conn *conn = (struct iscsi_conn *) data;
1054
1055 iscsit_inc_conn_usage_count(conn);
1056
1057 spin_lock_bh(&conn->nopin_timer_lock);
1058 if (conn->nopin_timer_flags & ISCSI_TF_STOP) {
1059 spin_unlock_bh(&conn->nopin_timer_lock);
1060 iscsit_dec_conn_usage_count(conn);
1061 return;
1062 }
1063 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1064 spin_unlock_bh(&conn->nopin_timer_lock);
1065
1066 iscsit_add_nopin(conn, 1);
1067 iscsit_dec_conn_usage_count(conn);
1068}
1069
1070/*
1071 * Called with conn->nopin_timer_lock held.
1072 */
1073void __iscsit_start_nopin_timer(struct iscsi_conn *conn)
1074{
1075 struct iscsi_session *sess = conn->sess;
1076 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1077 /*
1078 * NOPIN timeout is disabled.
1079 */
1080 if (!na->nopin_timeout)
1081 return;
1082
1083 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING)
1084 return;
1085
1086 init_timer(&conn->nopin_timer);
1087 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1088 conn->nopin_timer.data = (unsigned long)conn;
1089 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1090 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1091 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1092 add_timer(&conn->nopin_timer);
1093
1094 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1095 " interval\n", conn->cid, na->nopin_timeout);
1096}
1097
1098void iscsit_start_nopin_timer(struct iscsi_conn *conn)
1099{
1100 struct iscsi_session *sess = conn->sess;
1101 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1102 /*
1103 * NOPIN timeout is disabled..
1104 */
1105 if (!na->nopin_timeout)
1106 return;
1107
1108 spin_lock_bh(&conn->nopin_timer_lock);
1109 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) {
1110 spin_unlock_bh(&conn->nopin_timer_lock);
1111 return;
1112 }
1113
1114 init_timer(&conn->nopin_timer);
1115 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1116 conn->nopin_timer.data = (unsigned long)conn;
1117 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1118 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1119 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1120 add_timer(&conn->nopin_timer);
1121
1122 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1123 " interval\n", conn->cid, na->nopin_timeout);
1124 spin_unlock_bh(&conn->nopin_timer_lock);
1125}
1126
1127void iscsit_stop_nopin_timer(struct iscsi_conn *conn)
1128{
1129 spin_lock_bh(&conn->nopin_timer_lock);
1130 if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) {
1131 spin_unlock_bh(&conn->nopin_timer_lock);
1132 return;
1133 }
1134 conn->nopin_timer_flags |= ISCSI_TF_STOP;
1135 spin_unlock_bh(&conn->nopin_timer_lock);
1136
1137 del_timer_sync(&conn->nopin_timer);
1138
1139 spin_lock_bh(&conn->nopin_timer_lock);
1140 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1141 spin_unlock_bh(&conn->nopin_timer_lock);
1142}
1143
1144int iscsit_send_tx_data(
1145 struct iscsi_cmd *cmd,
1146 struct iscsi_conn *conn,
1147 int use_misc)
1148{
1149 int tx_sent, tx_size;
1150 u32 iov_count;
1151 struct kvec *iov;
1152
1153send_data:
1154 tx_size = cmd->tx_size;
1155
1156 if (!use_misc) {
1157 iov = &cmd->iov_data[0];
1158 iov_count = cmd->iov_data_count;
1159 } else {
1160 iov = &cmd->iov_misc[0];
1161 iov_count = cmd->iov_misc_count;
1162 }
1163
1164 tx_sent = tx_data(conn, &iov[0], iov_count, tx_size);
1165 if (tx_size != tx_sent) {
1166 if (tx_sent == -EAGAIN) {
1167 pr_err("tx_data() returned -EAGAIN\n");
1168 goto send_data;
1169 } else
1170 return -1;
1171 }
1172 cmd->tx_size = 0;
1173
1174 return 0;
1175}
1176
1177int iscsit_fe_sendpage_sg(
1178 struct iscsi_cmd *cmd,
1179 struct iscsi_conn *conn)
1180{
1181 struct scatterlist *sg = cmd->first_data_sg;
1182 struct kvec iov;
1183 u32 tx_hdr_size, data_len;
1184 u32 offset = cmd->first_data_sg_off;
40b05497 1185 int tx_sent, iov_off;
e48354ce
NB		 1186
1187send_hdr:
1188 tx_hdr_size = ISCSI_HDR_LEN;
1189 if (conn->conn_ops->HeaderDigest)
1190 tx_hdr_size += ISCSI_CRC_LEN;
1191
1192 iov.iov_base = cmd->pdu;
1193 iov.iov_len = tx_hdr_size;
1194
1195 tx_sent = tx_data(conn, &iov, 1, tx_hdr_size);
1196 if (tx_hdr_size != tx_sent) {
1197 if (tx_sent == -EAGAIN) {
1198 pr_err("tx_data() returned -EAGAIN\n");
1199 goto send_hdr;
1200 }
1201 return -1;
1202 }
1203
1204 data_len = cmd->tx_size - tx_hdr_size - cmd->padding;
40b05497
NB		 1205 /*
1206 * Set iov_off used by padding and data digest tx_data() calls below
1207 * in order to determine proper offset into cmd->iov_data[]
1208 */
1209 if (conn->conn_ops->DataDigest) {
e48354ce 1210 data_len -= ISCSI_CRC_LEN;
40b05497
NB		 1211 if (cmd->padding)
1212 iov_off = (cmd->iov_data_count - 2);
1213 else
1214 iov_off = (cmd->iov_data_count - 1);
1215 } else {
1216 iov_off = (cmd->iov_data_count - 1);
1217 }
e48354ce
NB		 1218 /*
1219 * Perform sendpage() for each page in the scatterlist
1220 */
1221 while (data_len) {
1222 u32 space = (sg->length - offset);
1223 u32 sub_len = min_t(u32, data_len, space);
1224send_pg:
1225 tx_sent = conn->sock->ops->sendpage(conn->sock,
1226 sg_page(sg), sg->offset + offset, sub_len, 0);
1227 if (tx_sent != sub_len) {
1228 if (tx_sent == -EAGAIN) {
1229 pr_err("tcp_sendpage() returned"
1230 " -EAGAIN\n");
1231 goto send_pg;
1232 }
1233
1234 pr_err("tcp_sendpage() failure: %d\n",
1235 tx_sent);
1236 return -1;
1237 }
1238
1239 data_len -= sub_len;
1240 offset = 0;
1241 sg = sg_next(sg);
1242 }
1243
1244send_padding:
1245 if (cmd->padding) {
40b05497 1246 struct kvec *iov_p = &cmd->iov_data[iov_off++];
e48354ce
NB		 1247
1248 tx_sent = tx_data(conn, iov_p, 1, cmd->padding);
1249 if (cmd->padding != tx_sent) {
1250 if (tx_sent == -EAGAIN) {
1251 pr_err("tx_data() returned -EAGAIN\n");
1252 goto send_padding;
1253 }
1254 return -1;
1255 }
1256 }
1257
1258send_datacrc:
1259 if (conn->conn_ops->DataDigest) {
40b05497 1260 struct kvec *iov_d = &cmd->iov_data[iov_off];
e48354ce
NB		 1261
1262 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN);
1263 if (ISCSI_CRC_LEN != tx_sent) {
1264 if (tx_sent == -EAGAIN) {
1265 pr_err("tx_data() returned -EAGAIN\n");
1266 goto send_datacrc;
1267 }
1268 return -1;
1269 }
1270 }
1271
1272 return 0;
1273}
1274
1275/*
1276 * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU
1277 * back to the Initiator when an expection condition occurs with the
1278 * errors set in status_class and status_detail.
1279 *
1280 * Parameters: iSCSI Connection, Status Class, Status Detail.
1281 * Returns: 0 on success, -1 on error.
1282 */
1283int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail)
1284{
e48354ce 1285 struct iscsi_login_rsp *hdr;
baa4d64b 1286 struct iscsi_login *login = conn->conn_login;
e48354ce 1287
baa4d64b 1288 login->login_failed = 1;
e48354ce
NB		 1289 iscsit_collect_login_stats(conn, status_class, status_detail);
1290
d2613415
NB		 1291 memset(&login->rsp[0], 0, ISCSI_HDR_LEN);
1292
baa4d64b 1293 hdr = (struct iscsi_login_rsp *)&login->rsp[0];
e48354ce
NB		 1294 hdr->opcode = ISCSI_OP_LOGIN_RSP;
1295 hdr->status_class = status_class;
1296 hdr->status_detail = status_detail;
66c7db68 1297 hdr->itt = conn->login_itt;
e48354ce 1298
baa4d64b 1299 return conn->conn_transport->iscsit_put_login_tx(conn, login, 0);
e48354ce
NB		 1300}
1301
1302void iscsit_print_session_params(struct iscsi_session *sess)
1303{
1304 struct iscsi_conn *conn;
1305
1306 pr_debug("-----------------------------[Session Params for"
1307 " SID: %u]-----------------------------\n", sess->sid);
1308 spin_lock_bh(&sess->conn_lock);
1309 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
1310 iscsi_dump_conn_ops(conn->conn_ops);
1311 spin_unlock_bh(&sess->conn_lock);
1312
1313 iscsi_dump_sess_ops(sess->sess_ops);
1314}
1315
1316static int iscsit_do_rx_data(
1317 struct iscsi_conn *conn,
1318 struct iscsi_data_count *count)
1319{
1320 int data = count->data_length, rx_loop = 0, total_rx = 0, iov_len;
2ff017f5 1321 struct kvec *iov_p;
e48354ce
NB		 1322 struct msghdr msg;
1323
1324 if (!conn || !conn->sock || !conn->conn_ops)
1325 return -1;
1326
1327 memset(&msg, 0, sizeof(struct msghdr));
1328
2ff017f5
NB		 1329 iov_p = count->iov;
1330 iov_len = count->iov_count;
e48354ce
NB		 1331
1332 while (total_rx < data) {
1333 rx_loop = kernel_recvmsg(conn->sock, &msg, iov_p, iov_len,
1334 (data - total_rx), MSG_WAITALL);
1335 if (rx_loop <= 0) {
1336 pr_debug("rx_loop: %d total_rx: %d\n",
1337 rx_loop, total_rx);
1338 return rx_loop;
1339 }
1340 total_rx += rx_loop;
1341 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n",
1342 rx_loop, total_rx, data);
1343 }
1344
e48354ce
NB		 1345 return total_rx;
1346}
1347
1348static int iscsit_do_tx_data(
1349 struct iscsi_conn *conn,
1350 struct iscsi_data_count *count)
1351{
1352 int data = count->data_length, total_tx = 0, tx_loop = 0, iov_len;
2ff017f5 1353 struct kvec *iov_p;
e48354ce
NB		 1354 struct msghdr msg;
1355
1356 if (!conn || !conn->sock || !conn->conn_ops)
1357 return -1;
1358
1359 if (data <= 0) {
1360 pr_err("Data length is: %d\n", data);
1361 return -1;
1362 }
1363
1364 memset(&msg, 0, sizeof(struct msghdr));
1365
2ff017f5
NB		 1366 iov_p = count->iov;
1367 iov_len = count->iov_count;
e48354ce
NB		 1368
1369 while (total_tx < data) {
1370 tx_loop = kernel_sendmsg(conn->sock, &msg, iov_p, iov_len,
1371 (data - total_tx));
1372 if (tx_loop <= 0) {
1373 pr_debug("tx_loop: %d total_tx %d\n",
1374 tx_loop, total_tx);
1375 return tx_loop;
1376 }
1377 total_tx += tx_loop;
1378 pr_debug("tx_loop: %d, total_tx: %d, data: %d\n",
1379 tx_loop, total_tx, data);
1380 }
1381
e48354ce
NB		 1382 return total_tx;
1383}
1384
1385int rx_data(
1386 struct iscsi_conn *conn,
1387 struct kvec *iov,
1388 int iov_count,
1389 int data)
1390{
1391 struct iscsi_data_count c;
1392
1393 if (!conn || !conn->sock || !conn->conn_ops)
1394 return -1;
1395
1396 memset(&c, 0, sizeof(struct iscsi_data_count));
1397 c.iov = iov;
1398 c.iov_count = iov_count;
1399 c.data_length = data;
1400 c.type = ISCSI_RX_DATA;
1401
e48354ce
NB		 1402 return iscsit_do_rx_data(conn, &c);
1403}
1404
1405int tx_data(
1406 struct iscsi_conn *conn,
1407 struct kvec *iov,
1408 int iov_count,
1409 int data)
1410{
1411 struct iscsi_data_count c;
1412
1413 if (!conn || !conn->sock || !conn->conn_ops)
1414 return -1;
1415
1416 memset(&c, 0, sizeof(struct iscsi_data_count));
1417 c.iov = iov;
1418 c.iov_count = iov_count;
1419 c.data_length = data;
1420 c.type = ISCSI_TX_DATA;
1421
e48354ce
NB		 1422 return iscsit_do_tx_data(conn, &c);
1423}
1424
1425void iscsit_collect_login_stats(
1426 struct iscsi_conn *conn,
1427 u8 status_class,
1428 u8 status_detail)
1429{
1430 struct iscsi_param *intrname = NULL;
1431 struct iscsi_tiqn *tiqn;
1432 struct iscsi_login_stats *ls;
1433
1434 tiqn = iscsit_snmp_get_tiqn(conn);
1435 if (!tiqn)
1436 return;
1437
1438 ls = &tiqn->login_stats;
1439
1440 spin_lock(&ls->lock);
1441 if (!strcmp(conn->login_ip, ls->last_intr_fail_ip_addr) &&
1442 ((get_jiffies_64() - ls->last_fail_time) < 10)) {
1443 /* We already have the failure info for this login */
1444 spin_unlock(&ls->lock);
1445 return;
1446 }
1447
1448 if (status_class == ISCSI_STATUS_CLS_SUCCESS)
1449 ls->accepts++;
1450 else if (status_class == ISCSI_STATUS_CLS_REDIRECT) {
1451 ls->redirects++;
1452 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT;
1453 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1454 (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) {
1455 ls->authenticate_fails++;
1456 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE;
1457 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1458 (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) {
1459 ls->authorize_fails++;
1460 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE;
1461 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1462 (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) {
1463 ls->negotiate_fails++;
1464 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE;
1465 } else {
1466 ls->other_fails++;
1467 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER;
1468 }
1469
1470 /* Save initiator name, ip address and time, if it is a failed login */
1471 if (status_class != ISCSI_STATUS_CLS_SUCCESS) {
1472 if (conn->param_list)
1473 intrname = iscsi_find_param_from_key(INITIATORNAME,
1474 conn->param_list);
1475 strcpy(ls->last_intr_fail_name,
1476 (intrname ? intrname->value : "Unknown"));
1477
baa4d64b
NB		 1478 ls->last_intr_fail_ip_family = conn->login_family;
1479
e48354ce
NB		 1480 snprintf(ls->last_intr_fail_ip_addr, IPV6_ADDRESS_SPACE,
1481 "%s", conn->login_ip);
1482 ls->last_fail_time = get_jiffies_64();
1483 }
1484
1485 spin_unlock(&ls->lock);
1486}
1487
1488struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn)
1489{
1490 struct iscsi_portal_group *tpg;
1491
1492 if (!conn || !conn->sess)
1493 return NULL;
1494
1495 tpg = conn->sess->tpg;
1496 if (!tpg)
1497 return NULL;
1498
1499 if (!tpg->tpg_tiqn)
1500 return NULL;
1501
1502 return tpg->tpg_tiqn;
1503}
kernel source for telekom puls (alcatel/mediatek)