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iscsi-target: Allow ->MaxXmitDataSegmentLength assignment for iser discovery
[deliverable/linux.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);
181 init_completion(&cmd->reject_comp);
182 spin_lock_init(&cmd->datain_lock);
183 spin_lock_init(&cmd->dataout_timeout_lock);
184 spin_lock_init(&cmd->istate_lock);
185 spin_lock_init(&cmd->error_lock);
186 spin_lock_init(&cmd->r2t_lock);
187
188 return cmd;
189}
cdb72665 190EXPORT_SYMBOL(iscsit_allocate_cmd);
e48354ce 191
e48354ce
NB		 192struct iscsi_seq *iscsit_get_seq_holder_for_datain(
193 struct iscsi_cmd *cmd,
194 u32 seq_send_order)
195{
196 u32 i;
197
198 for (i = 0; i < cmd->seq_count; i++)
199 if (cmd->seq_list[i].seq_send_order == seq_send_order)
200 return &cmd->seq_list[i];
201
202 return NULL;
203}
204
205struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsi_cmd *cmd)
206{
207 u32 i;
208
209 if (!cmd->seq_list) {
210 pr_err("struct iscsi_cmd->seq_list is NULL!\n");
211 return NULL;
212 }
213
214 for (i = 0; i < cmd->seq_count; i++) {
215 if (cmd->seq_list[i].type != SEQTYPE_NORMAL)
216 continue;
217 if (cmd->seq_list[i].seq_send_order == cmd->seq_send_order) {
218 cmd->seq_send_order++;
219 return &cmd->seq_list[i];
220 }
221 }
222
223 return NULL;
224}
225
226struct iscsi_r2t *iscsit_get_holder_for_r2tsn(
227 struct iscsi_cmd *cmd,
228 u32 r2t_sn)
229{
230 struct iscsi_r2t *r2t;
231
232 spin_lock_bh(&cmd->r2t_lock);
233 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
234 if (r2t->r2t_sn == r2t_sn) {
235 spin_unlock_bh(&cmd->r2t_lock);
236 return r2t;
237 }
238 }
239 spin_unlock_bh(&cmd->r2t_lock);
240
241 return NULL;
242}
243
244static inline int iscsit_check_received_cmdsn(struct iscsi_session *sess, u32 cmdsn)
245{
246 int ret;
247
248 /*
249 * This is the proper method of checking received CmdSN against
250 * ExpCmdSN and MaxCmdSN values, as well as accounting for out
251 * or order CmdSNs due to multiple connection sessions and/or
252 * CRC failures.
253 */
254 if (iscsi_sna_gt(cmdsn, sess->max_cmd_sn)) {
255 pr_err("Received CmdSN: 0x%08x is greater than"
256 " MaxCmdSN: 0x%08x, protocol error.\n", cmdsn,
257 sess->max_cmd_sn);
258 ret = CMDSN_ERROR_CANNOT_RECOVER;
259
260 } else if (cmdsn == sess->exp_cmd_sn) {
261 sess->exp_cmd_sn++;
262 pr_debug("Received CmdSN matches ExpCmdSN,"
263 " incremented ExpCmdSN to: 0x%08x\n",
264 sess->exp_cmd_sn);
265 ret = CMDSN_NORMAL_OPERATION;
266
267 } else if (iscsi_sna_gt(cmdsn, sess->exp_cmd_sn)) {
268 pr_debug("Received CmdSN: 0x%08x is greater"
269 " than ExpCmdSN: 0x%08x, not acknowledging.\n",
270 cmdsn, sess->exp_cmd_sn);
271 ret = CMDSN_HIGHER_THAN_EXP;
272
273 } else {
274 pr_err("Received CmdSN: 0x%08x is less than"
275 " ExpCmdSN: 0x%08x, ignoring.\n", cmdsn,
276 sess->exp_cmd_sn);
277 ret = CMDSN_LOWER_THAN_EXP;
278 }
279
280 return ret;
281}
282
283/*
284 * Commands may be received out of order if MC/S is in use.
285 * Ensure they are executed in CmdSN order.
286 */
287int iscsit_sequence_cmd(
288 struct iscsi_conn *conn,
289 struct iscsi_cmd *cmd,
50e5c87d 290 __be32 cmdsn)
e48354ce
NB		 291{
292 int ret;
293 int cmdsn_ret;
294
295 mutex_lock(&conn->sess->cmdsn_mutex);
296
50e5c87d 297 cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, be32_to_cpu(cmdsn));
e48354ce
NB		 298 switch (cmdsn_ret) {
299 case CMDSN_NORMAL_OPERATION:
300 ret = iscsit_execute_cmd(cmd, 0);
301 if ((ret >= 0) && !list_empty(&conn->sess->sess_ooo_cmdsn_list))
302 iscsit_execute_ooo_cmdsns(conn->sess);
303 break;
304 case CMDSN_HIGHER_THAN_EXP:
50e5c87d 305 ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, be32_to_cpu(cmdsn));
e48354ce
NB		 306 break;
307 case CMDSN_LOWER_THAN_EXP:
308 cmd->i_state = ISTATE_REMOVE;
309 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
310 ret = cmdsn_ret;
311 break;
312 default:
313 ret = cmdsn_ret;
314 break;
315 }
316 mutex_unlock(&conn->sess->cmdsn_mutex);
317
318 return ret;
319}
3e1c81a9 320EXPORT_SYMBOL(iscsit_sequence_cmd);
e48354ce
NB		 321
322int iscsit_check_unsolicited_dataout(struct iscsi_cmd *cmd, unsigned char *buf)
323{
324 struct iscsi_conn *conn = cmd->conn;
325 struct se_cmd *se_cmd = &cmd->se_cmd;
326 struct iscsi_data *hdr = (struct iscsi_data *) buf;
327 u32 payload_length = ntoh24(hdr->dlength);
328
329 if (conn->sess->sess_ops->InitialR2T) {
330 pr_err("Received unexpected unsolicited data"
331 " while InitialR2T=Yes, protocol error.\n");
332 transport_send_check_condition_and_sense(se_cmd,
333 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
334 return -1;
335 }
336
337 if ((cmd->first_burst_len + payload_length) >
338 conn->sess->sess_ops->FirstBurstLength) {
339 pr_err("Total %u bytes exceeds FirstBurstLength: %u"
340 " for this Unsolicited DataOut Burst.\n",
341 (cmd->first_burst_len + payload_length),
342 conn->sess->sess_ops->FirstBurstLength);
343 transport_send_check_condition_and_sense(se_cmd,
344 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
345 return -1;
346 }
347
348 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))
349 return 0;
350
ebf1d95c 351 if (((cmd->first_burst_len + payload_length) != cmd->se_cmd.data_length) &&
e48354ce
NB		 352 ((cmd->first_burst_len + payload_length) !=
353 conn->sess->sess_ops->FirstBurstLength)) {
354 pr_err("Unsolicited non-immediate data received %u"
355 " does not equal FirstBurstLength: %u, and does"
356 " not equal ExpXferLen %u.\n",
357 (cmd->first_burst_len + payload_length),
ebf1d95c 358 conn->sess->sess_ops->FirstBurstLength, cmd->se_cmd.data_length);
e48354ce
NB		 359 transport_send_check_condition_and_sense(se_cmd,
360 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
361 return -1;
362 }
363 return 0;
364}
365
366struct iscsi_cmd *iscsit_find_cmd_from_itt(
367 struct iscsi_conn *conn,
66c7db68 368 itt_t init_task_tag)
e48354ce
NB		 369{
370 struct iscsi_cmd *cmd;
371
372 spin_lock_bh(&conn->cmd_lock);
2fbb471e 373 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
e48354ce
NB		 374 if (cmd->init_task_tag == init_task_tag) {
375 spin_unlock_bh(&conn->cmd_lock);
376 return cmd;
377 }
378 }
379 spin_unlock_bh(&conn->cmd_lock);
380
381 pr_err("Unable to locate ITT: 0x%08x on CID: %hu",
382 init_task_tag, conn->cid);
383 return NULL;
384}
385
386struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump(
387 struct iscsi_conn *conn,
66c7db68 388 itt_t init_task_tag,
e48354ce
NB		 389 u32 length)
390{
391 struct iscsi_cmd *cmd;
392
393 spin_lock_bh(&conn->cmd_lock);
2fbb471e 394 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
e48354ce
NB		 395 if (cmd->init_task_tag == init_task_tag) {
396 spin_unlock_bh(&conn->cmd_lock);
397 return cmd;
398 }
399 }
400 spin_unlock_bh(&conn->cmd_lock);
401
402 pr_err("Unable to locate ITT: 0x%08x on CID: %hu,"
403 " dumping payload\n", init_task_tag, conn->cid);
404 if (length)
405 iscsit_dump_data_payload(conn, length, 1);
406
407 return NULL;
408}
409
410struct iscsi_cmd *iscsit_find_cmd_from_ttt(
411 struct iscsi_conn *conn,
412 u32 targ_xfer_tag)
413{
414 struct iscsi_cmd *cmd = NULL;
415
416 spin_lock_bh(&conn->cmd_lock);
2fbb471e 417 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
e48354ce
NB		 418 if (cmd->targ_xfer_tag == targ_xfer_tag) {
419 spin_unlock_bh(&conn->cmd_lock);
420 return cmd;
421 }
422 }
423 spin_unlock_bh(&conn->cmd_lock);
424
425 pr_err("Unable to locate TTT: 0x%08x on CID: %hu\n",
426 targ_xfer_tag, conn->cid);
427 return NULL;
428}
429
430int iscsit_find_cmd_for_recovery(
431 struct iscsi_session *sess,
432 struct iscsi_cmd **cmd_ptr,
433 struct iscsi_conn_recovery **cr_ptr,
66c7db68 434 itt_t init_task_tag)
e48354ce
NB		 435{
436 struct iscsi_cmd *cmd = NULL;
437 struct iscsi_conn_recovery *cr;
438 /*
439 * Scan through the inactive connection recovery list's command list.
440 * If init_task_tag matches the command is still alligent.
441 */
442 spin_lock(&sess->cr_i_lock);
443 list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) {
444 spin_lock(&cr->conn_recovery_cmd_lock);
2fbb471e 445 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
e48354ce
NB		 446 if (cmd->init_task_tag == init_task_tag) {
447 spin_unlock(&cr->conn_recovery_cmd_lock);
448 spin_unlock(&sess->cr_i_lock);
449
450 *cr_ptr = cr;
451 *cmd_ptr = cmd;
452 return -2;
453 }
454 }
455 spin_unlock(&cr->conn_recovery_cmd_lock);
456 }
457 spin_unlock(&sess->cr_i_lock);
458 /*
459 * Scan through the active connection recovery list's command list.
460 * If init_task_tag matches the command is ready to be reassigned.
461 */
462 spin_lock(&sess->cr_a_lock);
463 list_for_each_entry(cr, &sess->cr_active_list, cr_list) {
464 spin_lock(&cr->conn_recovery_cmd_lock);
2fbb471e 465 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
e48354ce
NB		 466 if (cmd->init_task_tag == init_task_tag) {
467 spin_unlock(&cr->conn_recovery_cmd_lock);
468 spin_unlock(&sess->cr_a_lock);
469
470 *cr_ptr = cr;
471 *cmd_ptr = cmd;
472 return 0;
473 }
474 }
475 spin_unlock(&cr->conn_recovery_cmd_lock);
476 }
477 spin_unlock(&sess->cr_a_lock);
478
479 return -1;
480}
481
482void iscsit_add_cmd_to_immediate_queue(
483 struct iscsi_cmd *cmd,
484 struct iscsi_conn *conn,
485 u8 state)
486{
487 struct iscsi_queue_req *qr;
488
489 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
490 if (!qr) {
491 pr_err("Unable to allocate memory for"
492 " struct iscsi_queue_req\n");
493 return;
494 }
495 INIT_LIST_HEAD(&qr->qr_list);
496 qr->cmd = cmd;
497 qr->state = state;
498
499 spin_lock_bh(&conn->immed_queue_lock);
500 list_add_tail(&qr->qr_list, &conn->immed_queue_list);
501 atomic_inc(&cmd->immed_queue_count);
502 atomic_set(&conn->check_immediate_queue, 1);
503 spin_unlock_bh(&conn->immed_queue_lock);
504
d5627acb 505 wake_up(&conn->queues_wq);
e48354ce
NB		 506}
507
508struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *conn)
509{
510 struct iscsi_queue_req *qr;
511
512 spin_lock_bh(&conn->immed_queue_lock);
513 if (list_empty(&conn->immed_queue_list)) {
514 spin_unlock_bh(&conn->immed_queue_lock);
515 return NULL;
516 }
1f981de5
RD		 517 qr = list_first_entry(&conn->immed_queue_list,
518 struct iscsi_queue_req, qr_list);
e48354ce
NB		 519
520 list_del(&qr->qr_list);
521 if (qr->cmd)
522 atomic_dec(&qr->cmd->immed_queue_count);
523 spin_unlock_bh(&conn->immed_queue_lock);
524
525 return qr;
526}
527
528static void iscsit_remove_cmd_from_immediate_queue(
529 struct iscsi_cmd *cmd,
530 struct iscsi_conn *conn)
531{
532 struct iscsi_queue_req *qr, *qr_tmp;
533
534 spin_lock_bh(&conn->immed_queue_lock);
535 if (!atomic_read(&cmd->immed_queue_count)) {
536 spin_unlock_bh(&conn->immed_queue_lock);
537 return;
538 }
539
540 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
541 if (qr->cmd != cmd)
542 continue;
543
544 atomic_dec(&qr->cmd->immed_queue_count);
545 list_del(&qr->qr_list);
546 kmem_cache_free(lio_qr_cache, qr);
547 }
548 spin_unlock_bh(&conn->immed_queue_lock);
549
550 if (atomic_read(&cmd->immed_queue_count)) {
551 pr_err("ITT: 0x%08x immed_queue_count: %d\n",
552 cmd->init_task_tag,
553 atomic_read(&cmd->immed_queue_count));
554 }
555}
556
557void iscsit_add_cmd_to_response_queue(
558 struct iscsi_cmd *cmd,
559 struct iscsi_conn *conn,
560 u8 state)
561{
562 struct iscsi_queue_req *qr;
563
564 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
565 if (!qr) {
566 pr_err("Unable to allocate memory for"
567 " struct iscsi_queue_req\n");
568 return;
569 }
570 INIT_LIST_HEAD(&qr->qr_list);
571 qr->cmd = cmd;
572 qr->state = state;
573
574 spin_lock_bh(&conn->response_queue_lock);
575 list_add_tail(&qr->qr_list, &conn->response_queue_list);
576 atomic_inc(&cmd->response_queue_count);
577 spin_unlock_bh(&conn->response_queue_lock);
578
d5627acb 579 wake_up(&conn->queues_wq);
e48354ce
NB		 580}
581
582struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *conn)
583{
584 struct iscsi_queue_req *qr;
585
586 spin_lock_bh(&conn->response_queue_lock);
587 if (list_empty(&conn->response_queue_list)) {
588 spin_unlock_bh(&conn->response_queue_lock);
589 return NULL;
590 }
591
1f981de5
RD		 592 qr = list_first_entry(&conn->response_queue_list,
593 struct iscsi_queue_req, qr_list);
e48354ce
NB		 594
595 list_del(&qr->qr_list);
596 if (qr->cmd)
597 atomic_dec(&qr->cmd->response_queue_count);
598 spin_unlock_bh(&conn->response_queue_lock);
599
600 return qr;
601}
602
603static void iscsit_remove_cmd_from_response_queue(
604 struct iscsi_cmd *cmd,
605 struct iscsi_conn *conn)
606{
607 struct iscsi_queue_req *qr, *qr_tmp;
608
609 spin_lock_bh(&conn->response_queue_lock);
610 if (!atomic_read(&cmd->response_queue_count)) {
611 spin_unlock_bh(&conn->response_queue_lock);
612 return;
613 }
614
615 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
616 qr_list) {
617 if (qr->cmd != cmd)
618 continue;
619
620 atomic_dec(&qr->cmd->response_queue_count);
621 list_del(&qr->qr_list);
622 kmem_cache_free(lio_qr_cache, qr);
623 }
624 spin_unlock_bh(&conn->response_queue_lock);
625
626 if (atomic_read(&cmd->response_queue_count)) {
627 pr_err("ITT: 0x%08x response_queue_count: %d\n",
628 cmd->init_task_tag,
629 atomic_read(&cmd->response_queue_count));
630 }
631}
632
d5627acb
RD		 633bool iscsit_conn_all_queues_empty(struct iscsi_conn *conn)
634{
635 bool empty;
636
637 spin_lock_bh(&conn->immed_queue_lock);
638 empty = list_empty(&conn->immed_queue_list);
639 spin_unlock_bh(&conn->immed_queue_lock);
640
641 if (!empty)
642 return empty;
643
644 spin_lock_bh(&conn->response_queue_lock);
645 empty = list_empty(&conn->response_queue_list);
646 spin_unlock_bh(&conn->response_queue_lock);
647
648 return empty;
649}
650
e48354ce
NB		 651void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn)
652{
653 struct iscsi_queue_req *qr, *qr_tmp;
654
655 spin_lock_bh(&conn->immed_queue_lock);
656 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
657 list_del(&qr->qr_list);
658 if (qr->cmd)
659 atomic_dec(&qr->cmd->immed_queue_count);
660
661 kmem_cache_free(lio_qr_cache, qr);
662 }
663 spin_unlock_bh(&conn->immed_queue_lock);
664
665 spin_lock_bh(&conn->response_queue_lock);
666 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
667 qr_list) {
668 list_del(&qr->qr_list);
669 if (qr->cmd)
670 atomic_dec(&qr->cmd->response_queue_count);
671
672 kmem_cache_free(lio_qr_cache, qr);
673 }
674 spin_unlock_bh(&conn->response_queue_lock);
675}
676
677void iscsit_release_cmd(struct iscsi_cmd *cmd)
678{
e48354ce
NB		 679 kfree(cmd->buf_ptr);
680 kfree(cmd->pdu_list);
681 kfree(cmd->seq_list);
682 kfree(cmd->tmr_req);
683 kfree(cmd->iov_data);
684
aafc9d15
NB		 685 kmem_cache_free(lio_cmd_cache, cmd);
686}
687
688static void __iscsit_free_cmd(struct iscsi_cmd *cmd, bool scsi_cmd,
689 bool check_queues)
690{
691 struct iscsi_conn *conn = cmd->conn;
692
693 if (scsi_cmd) {
694 if (cmd->data_direction == DMA_TO_DEVICE) {
695 iscsit_stop_dataout_timer(cmd);
696 iscsit_free_r2ts_from_list(cmd);
697 }
698 if (cmd->data_direction == DMA_FROM_DEVICE)
699 iscsit_free_all_datain_reqs(cmd);
700 }
701
702 if (conn && check_queues) {
e48354ce
NB		 703 iscsit_remove_cmd_from_immediate_queue(cmd, conn);
704 iscsit_remove_cmd_from_response_queue(cmd, conn);
705 }
e48354ce
NB		 706}
707
aafc9d15 708void iscsit_free_cmd(struct iscsi_cmd *cmd, bool shutdown)
d270190a 709{
aafc9d15
NB		 710 struct se_cmd *se_cmd = NULL;
711 int rc;
d270190a 712 /*
20879696 713 * Determine if a struct se_cmd is associated with
d270190a
NB		 714 * this struct iscsi_cmd.
715 */
716 switch (cmd->iscsi_opcode) {
717 case ISCSI_OP_SCSI_CMD:
aafc9d15
NB		 718 se_cmd = &cmd->se_cmd;
719 __iscsit_free_cmd(cmd, true, shutdown);
cdb72665
NB		 720 /*
721 * Fallthrough
722 */
d270190a 723 case ISCSI_OP_SCSI_TMFUNC:
aafc9d15
NB		 724 rc = transport_generic_free_cmd(&cmd->se_cmd, 1);
725 if (!rc && shutdown && se_cmd && se_cmd->se_sess) {
726 __iscsit_free_cmd(cmd, true, shutdown);
727 target_put_sess_cmd(se_cmd->se_sess, se_cmd);
728 }
d270190a 729 break;
c1ce4bd5
NB		 730 case ISCSI_OP_REJECT:
731 /*
732 * Handle special case for REJECT when iscsi_add_reject*() has
733 * overwritten the original iscsi_opcode assignment, and the
734 * associated cmd->se_cmd needs to be released.
735 */
736 if (cmd->se_cmd.se_tfo != NULL) {
aafc9d15
NB		 737 se_cmd = &cmd->se_cmd;
738 __iscsit_free_cmd(cmd, true, shutdown);
739
740 rc = transport_generic_free_cmd(&cmd->se_cmd, 1);
741 if (!rc && shutdown && se_cmd->se_sess) {
742 __iscsit_free_cmd(cmd, true, shutdown);
743 target_put_sess_cmd(se_cmd->se_sess, se_cmd);
744 }
c1ce4bd5
NB		 745 break;
746 }
747 /* Fall-through */
d270190a 748 default:
aafc9d15 749 __iscsit_free_cmd(cmd, false, shutdown);
cdb72665 750 cmd->release_cmd(cmd);
d270190a
NB		 751 break;
752 }
753}
754
e48354ce
NB		 755int iscsit_check_session_usage_count(struct iscsi_session *sess)
756{
757 spin_lock_bh(&sess->session_usage_lock);
758 if (sess->session_usage_count != 0) {
759 sess->session_waiting_on_uc = 1;
760 spin_unlock_bh(&sess->session_usage_lock);
761 if (in_interrupt())
762 return 2;
763
764 wait_for_completion(&sess->session_waiting_on_uc_comp);
765 return 1;
766 }
767 spin_unlock_bh(&sess->session_usage_lock);
768
769 return 0;
770}
771
772void iscsit_dec_session_usage_count(struct iscsi_session *sess)
773{
774 spin_lock_bh(&sess->session_usage_lock);
775 sess->session_usage_count--;
776
777 if (!sess->session_usage_count && sess->session_waiting_on_uc)
778 complete(&sess->session_waiting_on_uc_comp);
779
780 spin_unlock_bh(&sess->session_usage_lock);
781}
782
783void iscsit_inc_session_usage_count(struct iscsi_session *sess)
784{
785 spin_lock_bh(&sess->session_usage_lock);
786 sess->session_usage_count++;
787 spin_unlock_bh(&sess->session_usage_lock);
788}
789
e48354ce
NB		 790/*
791 * Setup conn->if_marker and conn->of_marker values based upon
792 * the initial marker-less interval. (see iSCSI v19 A.2)
793 */
794int iscsit_set_sync_and_steering_values(struct iscsi_conn *conn)
795{
796 int login_ifmarker_count = 0, login_ofmarker_count = 0, next_marker = 0;
797 /*
798 * IFMarkInt and OFMarkInt are negotiated as 32-bit words.
799 */
800 u32 IFMarkInt = (conn->conn_ops->IFMarkInt * 4);
801 u32 OFMarkInt = (conn->conn_ops->OFMarkInt * 4);
802
803 if (conn->conn_ops->OFMarker) {
804 /*
805 * Account for the first Login Command received not
806 * via iscsi_recv_msg().
807 */
808 conn->of_marker += ISCSI_HDR_LEN;
809 if (conn->of_marker <= OFMarkInt) {
810 conn->of_marker = (OFMarkInt - conn->of_marker);
811 } else {
812 login_ofmarker_count = (conn->of_marker / OFMarkInt);
813 next_marker = (OFMarkInt * (login_ofmarker_count + 1)) +
814 (login_ofmarker_count * MARKER_SIZE);
815 conn->of_marker = (next_marker - conn->of_marker);
816 }
817 conn->of_marker_offset = 0;
818 pr_debug("Setting OFMarker value to %u based on Initial"
819 " Markerless Interval.\n", conn->of_marker);
820 }
821
822 if (conn->conn_ops->IFMarker) {
823 if (conn->if_marker <= IFMarkInt) {
824 conn->if_marker = (IFMarkInt - conn->if_marker);
825 } else {
826 login_ifmarker_count = (conn->if_marker / IFMarkInt);
827 next_marker = (IFMarkInt * (login_ifmarker_count + 1)) +
828 (login_ifmarker_count * MARKER_SIZE);
829 conn->if_marker = (next_marker - conn->if_marker);
830 }
831 pr_debug("Setting IFMarker value to %u based on Initial"
832 " Markerless Interval.\n", conn->if_marker);
833 }
834
835 return 0;
836}
837
838struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid)
839{
840 struct iscsi_conn *conn;
841
842 spin_lock_bh(&sess->conn_lock);
843 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
844 if ((conn->cid == cid) &&
845 (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) {
846 iscsit_inc_conn_usage_count(conn);
847 spin_unlock_bh(&sess->conn_lock);
848 return conn;
849 }
850 }
851 spin_unlock_bh(&sess->conn_lock);
852
853 return NULL;
854}
855
856struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid)
857{
858 struct iscsi_conn *conn;
859
860 spin_lock_bh(&sess->conn_lock);
861 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
862 if (conn->cid == cid) {
863 iscsit_inc_conn_usage_count(conn);
864 spin_lock(&conn->state_lock);
865 atomic_set(&conn->connection_wait_rcfr, 1);
866 spin_unlock(&conn->state_lock);
867 spin_unlock_bh(&sess->conn_lock);
868 return conn;
869 }
870 }
871 spin_unlock_bh(&sess->conn_lock);
872
873 return NULL;
874}
875
876void iscsit_check_conn_usage_count(struct iscsi_conn *conn)
877{
878 spin_lock_bh(&conn->conn_usage_lock);
879 if (conn->conn_usage_count != 0) {
880 conn->conn_waiting_on_uc = 1;
881 spin_unlock_bh(&conn->conn_usage_lock);
882
883 wait_for_completion(&conn->conn_waiting_on_uc_comp);
884 return;
885 }
886 spin_unlock_bh(&conn->conn_usage_lock);
887}
888
889void iscsit_dec_conn_usage_count(struct iscsi_conn *conn)
890{
891 spin_lock_bh(&conn->conn_usage_lock);
892 conn->conn_usage_count--;
893
894 if (!conn->conn_usage_count && conn->conn_waiting_on_uc)
895 complete(&conn->conn_waiting_on_uc_comp);
896
897 spin_unlock_bh(&conn->conn_usage_lock);
898}
899
900void iscsit_inc_conn_usage_count(struct iscsi_conn *conn)
901{
902 spin_lock_bh(&conn->conn_usage_lock);
903 conn->conn_usage_count++;
904 spin_unlock_bh(&conn->conn_usage_lock);
905}
906
907static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response)
908{
909 u8 state;
910 struct iscsi_cmd *cmd;
911
912 cmd = iscsit_allocate_cmd(conn, GFP_ATOMIC);
913 if (!cmd)
914 return -1;
915
916 cmd->iscsi_opcode = ISCSI_OP_NOOP_IN;
917 state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE :
918 ISTATE_SEND_NOPIN_NO_RESPONSE;
66c7db68 919 cmd->init_task_tag = RESERVED_ITT;
e48354ce
NB		 920 spin_lock_bh(&conn->sess->ttt_lock);
921 cmd->targ_xfer_tag = (want_response) ? conn->sess->targ_xfer_tag++ :
922 0xFFFFFFFF;
923 if (want_response && (cmd->targ_xfer_tag == 0xFFFFFFFF))
924 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
925 spin_unlock_bh(&conn->sess->ttt_lock);
926
927 spin_lock_bh(&conn->cmd_lock);
2fbb471e 928 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
e48354ce
NB		 929 spin_unlock_bh(&conn->cmd_lock);
930
931 if (want_response)
932 iscsit_start_nopin_response_timer(conn);
933 iscsit_add_cmd_to_immediate_queue(cmd, conn, state);
934
935 return 0;
936}
937
938static void iscsit_handle_nopin_response_timeout(unsigned long data)
939{
940 struct iscsi_conn *conn = (struct iscsi_conn *) data;
941
942 iscsit_inc_conn_usage_count(conn);
943
944 spin_lock_bh(&conn->nopin_timer_lock);
945 if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) {
946 spin_unlock_bh(&conn->nopin_timer_lock);
947 iscsit_dec_conn_usage_count(conn);
948 return;
949 }
950
951 pr_debug("Did not receive response to NOPIN on CID: %hu on"
952 " SID: %u, failing connection.\n", conn->cid,
953 conn->sess->sid);
954 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
955 spin_unlock_bh(&conn->nopin_timer_lock);
956
957 {
958 struct iscsi_portal_group *tpg = conn->sess->tpg;
959 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
960
961 if (tiqn) {
962 spin_lock_bh(&tiqn->sess_err_stats.lock);
963 strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
8359cf43 964 conn->sess->sess_ops->InitiatorName);
e48354ce
NB		 965 tiqn->sess_err_stats.last_sess_failure_type =
966 ISCSI_SESS_ERR_CXN_TIMEOUT;
967 tiqn->sess_err_stats.cxn_timeout_errors++;
968 conn->sess->conn_timeout_errors++;
969 spin_unlock_bh(&tiqn->sess_err_stats.lock);
970 }
971 }
972
973 iscsit_cause_connection_reinstatement(conn, 0);
974 iscsit_dec_conn_usage_count(conn);
975}
976
977void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn)
978{
979 struct iscsi_session *sess = conn->sess;
980 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
981
982 spin_lock_bh(&conn->nopin_timer_lock);
983 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
984 spin_unlock_bh(&conn->nopin_timer_lock);
985 return;
986 }
987
988 mod_timer(&conn->nopin_response_timer,
989 (get_jiffies_64() + na->nopin_response_timeout * HZ));
990 spin_unlock_bh(&conn->nopin_timer_lock);
991}
992
993/*
994 * Called with conn->nopin_timer_lock held.
995 */
996void iscsit_start_nopin_response_timer(struct iscsi_conn *conn)
997{
998 struct iscsi_session *sess = conn->sess;
999 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1000
1001 spin_lock_bh(&conn->nopin_timer_lock);
1002 if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) {
1003 spin_unlock_bh(&conn->nopin_timer_lock);
1004 return;
1005 }
1006
1007 init_timer(&conn->nopin_response_timer);
1008 conn->nopin_response_timer.expires =
1009 (get_jiffies_64() + na->nopin_response_timeout * HZ);
1010 conn->nopin_response_timer.data = (unsigned long)conn;
1011 conn->nopin_response_timer.function = iscsit_handle_nopin_response_timeout;
1012 conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP;
1013 conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING;
1014 add_timer(&conn->nopin_response_timer);
1015
1016 pr_debug("Started NOPIN Response Timer on CID: %d to %u"
1017 " seconds\n", conn->cid, na->nopin_response_timeout);
1018 spin_unlock_bh(&conn->nopin_timer_lock);
1019}
1020
1021void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn)
1022{
1023 spin_lock_bh(&conn->nopin_timer_lock);
1024 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
1025 spin_unlock_bh(&conn->nopin_timer_lock);
1026 return;
1027 }
1028 conn->nopin_response_timer_flags |= ISCSI_TF_STOP;
1029 spin_unlock_bh(&conn->nopin_timer_lock);
1030
1031 del_timer_sync(&conn->nopin_response_timer);
1032
1033 spin_lock_bh(&conn->nopin_timer_lock);
1034 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
1035 spin_unlock_bh(&conn->nopin_timer_lock);
1036}
1037
1038static void iscsit_handle_nopin_timeout(unsigned long data)
1039{
1040 struct iscsi_conn *conn = (struct iscsi_conn *) data;
1041
1042 iscsit_inc_conn_usage_count(conn);
1043
1044 spin_lock_bh(&conn->nopin_timer_lock);
1045 if (conn->nopin_timer_flags & ISCSI_TF_STOP) {
1046 spin_unlock_bh(&conn->nopin_timer_lock);
1047 iscsit_dec_conn_usage_count(conn);
1048 return;
1049 }
1050 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1051 spin_unlock_bh(&conn->nopin_timer_lock);
1052
1053 iscsit_add_nopin(conn, 1);
1054 iscsit_dec_conn_usage_count(conn);
1055}
1056
1057/*
1058 * Called with conn->nopin_timer_lock held.
1059 */
1060void __iscsit_start_nopin_timer(struct iscsi_conn *conn)
1061{
1062 struct iscsi_session *sess = conn->sess;
1063 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1064 /*
1065 * NOPIN timeout is disabled.
1066 */
1067 if (!na->nopin_timeout)
1068 return;
1069
1070 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING)
1071 return;
1072
1073 init_timer(&conn->nopin_timer);
1074 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1075 conn->nopin_timer.data = (unsigned long)conn;
1076 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1077 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1078 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1079 add_timer(&conn->nopin_timer);
1080
1081 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1082 " interval\n", conn->cid, na->nopin_timeout);
1083}
1084
1085void iscsit_start_nopin_timer(struct iscsi_conn *conn)
1086{
1087 struct iscsi_session *sess = conn->sess;
1088 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1089 /*
1090 * NOPIN timeout is disabled..
1091 */
1092 if (!na->nopin_timeout)
1093 return;
1094
1095 spin_lock_bh(&conn->nopin_timer_lock);
1096 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) {
1097 spin_unlock_bh(&conn->nopin_timer_lock);
1098 return;
1099 }
1100
1101 init_timer(&conn->nopin_timer);
1102 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1103 conn->nopin_timer.data = (unsigned long)conn;
1104 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1105 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1106 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1107 add_timer(&conn->nopin_timer);
1108
1109 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1110 " interval\n", conn->cid, na->nopin_timeout);
1111 spin_unlock_bh(&conn->nopin_timer_lock);
1112}
1113
1114void iscsit_stop_nopin_timer(struct iscsi_conn *conn)
1115{
1116 spin_lock_bh(&conn->nopin_timer_lock);
1117 if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) {
1118 spin_unlock_bh(&conn->nopin_timer_lock);
1119 return;
1120 }
1121 conn->nopin_timer_flags |= ISCSI_TF_STOP;
1122 spin_unlock_bh(&conn->nopin_timer_lock);
1123
1124 del_timer_sync(&conn->nopin_timer);
1125
1126 spin_lock_bh(&conn->nopin_timer_lock);
1127 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1128 spin_unlock_bh(&conn->nopin_timer_lock);
1129}
1130
1131int iscsit_send_tx_data(
1132 struct iscsi_cmd *cmd,
1133 struct iscsi_conn *conn,
1134 int use_misc)
1135{
1136 int tx_sent, tx_size;
1137 u32 iov_count;
1138 struct kvec *iov;
1139
1140send_data:
1141 tx_size = cmd->tx_size;
1142
1143 if (!use_misc) {
1144 iov = &cmd->iov_data[0];
1145 iov_count = cmd->iov_data_count;
1146 } else {
1147 iov = &cmd->iov_misc[0];
1148 iov_count = cmd->iov_misc_count;
1149 }
1150
1151 tx_sent = tx_data(conn, &iov[0], iov_count, tx_size);
1152 if (tx_size != tx_sent) {
1153 if (tx_sent == -EAGAIN) {
1154 pr_err("tx_data() returned -EAGAIN\n");
1155 goto send_data;
1156 } else
1157 return -1;
1158 }
1159 cmd->tx_size = 0;
1160
1161 return 0;
1162}
1163
1164int iscsit_fe_sendpage_sg(
1165 struct iscsi_cmd *cmd,
1166 struct iscsi_conn *conn)
1167{
1168 struct scatterlist *sg = cmd->first_data_sg;
1169 struct kvec iov;
1170 u32 tx_hdr_size, data_len;
1171 u32 offset = cmd->first_data_sg_off;
40b05497 1172 int tx_sent, iov_off;
e48354ce
NB		 1173
1174send_hdr:
1175 tx_hdr_size = ISCSI_HDR_LEN;
1176 if (conn->conn_ops->HeaderDigest)
1177 tx_hdr_size += ISCSI_CRC_LEN;
1178
1179 iov.iov_base = cmd->pdu;
1180 iov.iov_len = tx_hdr_size;
1181
1182 tx_sent = tx_data(conn, &iov, 1, tx_hdr_size);
1183 if (tx_hdr_size != tx_sent) {
1184 if (tx_sent == -EAGAIN) {
1185 pr_err("tx_data() returned -EAGAIN\n");
1186 goto send_hdr;
1187 }
1188 return -1;
1189 }
1190
1191 data_len = cmd->tx_size - tx_hdr_size - cmd->padding;
40b05497
NB		 1192 /*
1193 * Set iov_off used by padding and data digest tx_data() calls below
1194 * in order to determine proper offset into cmd->iov_data[]
1195 */
1196 if (conn->conn_ops->DataDigest) {
e48354ce 1197 data_len -= ISCSI_CRC_LEN;
40b05497
NB		 1198 if (cmd->padding)
1199 iov_off = (cmd->iov_data_count - 2);
1200 else
1201 iov_off = (cmd->iov_data_count - 1);
1202 } else {
1203 iov_off = (cmd->iov_data_count - 1);
1204 }
e48354ce
NB		 1205 /*
1206 * Perform sendpage() for each page in the scatterlist
1207 */
1208 while (data_len) {
1209 u32 space = (sg->length - offset);
1210 u32 sub_len = min_t(u32, data_len, space);
1211send_pg:
1212 tx_sent = conn->sock->ops->sendpage(conn->sock,
1213 sg_page(sg), sg->offset + offset, sub_len, 0);
1214 if (tx_sent != sub_len) {
1215 if (tx_sent == -EAGAIN) {
1216 pr_err("tcp_sendpage() returned"
1217 " -EAGAIN\n");
1218 goto send_pg;
1219 }
1220
1221 pr_err("tcp_sendpage() failure: %d\n",
1222 tx_sent);
1223 return -1;
1224 }
1225
1226 data_len -= sub_len;
1227 offset = 0;
1228 sg = sg_next(sg);
1229 }
1230
1231send_padding:
1232 if (cmd->padding) {
40b05497 1233 struct kvec *iov_p = &cmd->iov_data[iov_off++];
e48354ce
NB		 1234
1235 tx_sent = tx_data(conn, iov_p, 1, cmd->padding);
1236 if (cmd->padding != tx_sent) {
1237 if (tx_sent == -EAGAIN) {
1238 pr_err("tx_data() returned -EAGAIN\n");
1239 goto send_padding;
1240 }
1241 return -1;
1242 }
1243 }
1244
1245send_datacrc:
1246 if (conn->conn_ops->DataDigest) {
40b05497 1247 struct kvec *iov_d = &cmd->iov_data[iov_off];
e48354ce
NB		 1248
1249 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN);
1250 if (ISCSI_CRC_LEN != tx_sent) {
1251 if (tx_sent == -EAGAIN) {
1252 pr_err("tx_data() returned -EAGAIN\n");
1253 goto send_datacrc;
1254 }
1255 return -1;
1256 }
1257 }
1258
1259 return 0;
1260}
1261
1262/*
1263 * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU
1264 * back to the Initiator when an expection condition occurs with the
1265 * errors set in status_class and status_detail.
1266 *
1267 * Parameters: iSCSI Connection, Status Class, Status Detail.
1268 * Returns: 0 on success, -1 on error.
1269 */
1270int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail)
1271{
e48354ce 1272 struct iscsi_login_rsp *hdr;
baa4d64b 1273 struct iscsi_login *login = conn->conn_login;
e48354ce 1274
baa4d64b 1275 login->login_failed = 1;
e48354ce
NB		 1276 iscsit_collect_login_stats(conn, status_class, status_detail);
1277
baa4d64b 1278 hdr = (struct iscsi_login_rsp *)&login->rsp[0];
e48354ce
NB		 1279 hdr->opcode = ISCSI_OP_LOGIN_RSP;
1280 hdr->status_class = status_class;
1281 hdr->status_detail = status_detail;
66c7db68 1282 hdr->itt = conn->login_itt;
e48354ce 1283
baa4d64b 1284 return conn->conn_transport->iscsit_put_login_tx(conn, login, 0);
e48354ce
NB		 1285}
1286
1287void iscsit_print_session_params(struct iscsi_session *sess)
1288{
1289 struct iscsi_conn *conn;
1290
1291 pr_debug("-----------------------------[Session Params for"
1292 " SID: %u]-----------------------------\n", sess->sid);
1293 spin_lock_bh(&sess->conn_lock);
1294 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
1295 iscsi_dump_conn_ops(conn->conn_ops);
1296 spin_unlock_bh(&sess->conn_lock);
1297
1298 iscsi_dump_sess_ops(sess->sess_ops);
1299}
1300
1301static int iscsit_do_rx_data(
1302 struct iscsi_conn *conn,
1303 struct iscsi_data_count *count)
1304{
1305 int data = count->data_length, rx_loop = 0, total_rx = 0, 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
1312 memset(&msg, 0, sizeof(struct msghdr));
1313
2ff017f5
NB		 1314 iov_p = count->iov;
1315 iov_len = count->iov_count;
e48354ce
NB		 1316
1317 while (total_rx < data) {
1318 rx_loop = kernel_recvmsg(conn->sock, &msg, iov_p, iov_len,
1319 (data - total_rx), MSG_WAITALL);
1320 if (rx_loop <= 0) {
1321 pr_debug("rx_loop: %d total_rx: %d\n",
1322 rx_loop, total_rx);
1323 return rx_loop;
1324 }
1325 total_rx += rx_loop;
1326 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n",
1327 rx_loop, total_rx, data);
1328 }
1329
e48354ce
NB		 1330 return total_rx;
1331}
1332
1333static int iscsit_do_tx_data(
1334 struct iscsi_conn *conn,
1335 struct iscsi_data_count *count)
1336{
1337 int data = count->data_length, total_tx = 0, tx_loop = 0, iov_len;
2ff017f5 1338 struct kvec *iov_p;
e48354ce
NB		 1339 struct msghdr msg;
1340
1341 if (!conn || !conn->sock || !conn->conn_ops)
1342 return -1;
1343
1344 if (data <= 0) {
1345 pr_err("Data length is: %d\n", data);
1346 return -1;
1347 }
1348
1349 memset(&msg, 0, sizeof(struct msghdr));
1350
2ff017f5
NB		 1351 iov_p = count->iov;
1352 iov_len = count->iov_count;
e48354ce
NB		 1353
1354 while (total_tx < data) {
1355 tx_loop = kernel_sendmsg(conn->sock, &msg, iov_p, iov_len,
1356 (data - total_tx));
1357 if (tx_loop <= 0) {
1358 pr_debug("tx_loop: %d total_tx %d\n",
1359 tx_loop, total_tx);
1360 return tx_loop;
1361 }
1362 total_tx += tx_loop;
1363 pr_debug("tx_loop: %d, total_tx: %d, data: %d\n",
1364 tx_loop, total_tx, data);
1365 }
1366
e48354ce
NB		 1367 return total_tx;
1368}
1369
1370int rx_data(
1371 struct iscsi_conn *conn,
1372 struct kvec *iov,
1373 int iov_count,
1374 int data)
1375{
1376 struct iscsi_data_count c;
1377
1378 if (!conn || !conn->sock || !conn->conn_ops)
1379 return -1;
1380
1381 memset(&c, 0, sizeof(struct iscsi_data_count));
1382 c.iov = iov;
1383 c.iov_count = iov_count;
1384 c.data_length = data;
1385 c.type = ISCSI_RX_DATA;
1386
e48354ce
NB		 1387 return iscsit_do_rx_data(conn, &c);
1388}
1389
1390int tx_data(
1391 struct iscsi_conn *conn,
1392 struct kvec *iov,
1393 int iov_count,
1394 int data)
1395{
1396 struct iscsi_data_count c;
1397
1398 if (!conn || !conn->sock || !conn->conn_ops)
1399 return -1;
1400
1401 memset(&c, 0, sizeof(struct iscsi_data_count));
1402 c.iov = iov;
1403 c.iov_count = iov_count;
1404 c.data_length = data;
1405 c.type = ISCSI_TX_DATA;
1406
e48354ce
NB		 1407 return iscsit_do_tx_data(conn, &c);
1408}
1409
1410void iscsit_collect_login_stats(
1411 struct iscsi_conn *conn,
1412 u8 status_class,
1413 u8 status_detail)
1414{
1415 struct iscsi_param *intrname = NULL;
1416 struct iscsi_tiqn *tiqn;
1417 struct iscsi_login_stats *ls;
1418
1419 tiqn = iscsit_snmp_get_tiqn(conn);
1420 if (!tiqn)
1421 return;
1422
1423 ls = &tiqn->login_stats;
1424
1425 spin_lock(&ls->lock);
1426 if (!strcmp(conn->login_ip, ls->last_intr_fail_ip_addr) &&
1427 ((get_jiffies_64() - ls->last_fail_time) < 10)) {
1428 /* We already have the failure info for this login */
1429 spin_unlock(&ls->lock);
1430 return;
1431 }
1432
1433 if (status_class == ISCSI_STATUS_CLS_SUCCESS)
1434 ls->accepts++;
1435 else if (status_class == ISCSI_STATUS_CLS_REDIRECT) {
1436 ls->redirects++;
1437 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT;
1438 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1439 (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) {
1440 ls->authenticate_fails++;
1441 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE;
1442 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1443 (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) {
1444 ls->authorize_fails++;
1445 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE;
1446 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1447 (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) {
1448 ls->negotiate_fails++;
1449 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE;
1450 } else {
1451 ls->other_fails++;
1452 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER;
1453 }
1454
1455 /* Save initiator name, ip address and time, if it is a failed login */
1456 if (status_class != ISCSI_STATUS_CLS_SUCCESS) {
1457 if (conn->param_list)
1458 intrname = iscsi_find_param_from_key(INITIATORNAME,
1459 conn->param_list);
1460 strcpy(ls->last_intr_fail_name,
1461 (intrname ? intrname->value : "Unknown"));
1462
baa4d64b
NB		 1463 ls->last_intr_fail_ip_family = conn->login_family;
1464
e48354ce
NB		 1465 snprintf(ls->last_intr_fail_ip_addr, IPV6_ADDRESS_SPACE,
1466 "%s", conn->login_ip);
1467 ls->last_fail_time = get_jiffies_64();
1468 }
1469
1470 spin_unlock(&ls->lock);
1471}
1472
1473struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn)
1474{
1475 struct iscsi_portal_group *tpg;
1476
1477 if (!conn || !conn->sess)
1478 return NULL;
1479
1480 tpg = conn->sess->tpg;
1481 if (!tpg)
1482 return NULL;
1483
1484 if (!tpg->tpg_tiqn)
1485 return NULL;
1486
1487 return tpg->tpg_tiqn;
1488}
Linux kernel - Deliverables
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