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iscsi-target: Disable markers + remove dangerous local scope array usage
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / target / iscsi / iscsi_target_util.c
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e48354ce
NB		 1/*******************************************************************************
2 * This file contains the iSCSI Target specific utility functions.
3 *
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>
25#include <target/target_core_transport.h>
26#include <target/target_core_tmr.h>
27#include <target/target_core_fabric_ops.h>
28#include <target/target_core_configfs.h>
29
30#include "iscsi_target_core.h"
31#include "iscsi_target_parameters.h"
32#include "iscsi_target_seq_pdu_list.h"
33#include "iscsi_target_datain_values.h"
34#include "iscsi_target_erl0.h"
35#include "iscsi_target_erl1.h"
36#include "iscsi_target_erl2.h"
37#include "iscsi_target_tpg.h"
38#include "iscsi_target_tq.h"
39#include "iscsi_target_util.h"
40#include "iscsi_target.h"
41
42#define PRINT_BUFF(buff, len) \
43{ \
44 int zzz; \
45 \
46 pr_debug("%d:\n", __LINE__); \
47 for (zzz = 0; zzz < len; zzz++) { \
48 if (zzz % 16 == 0) { \
49 if (zzz) \
50 pr_debug("\n"); \
51 pr_debug("%4i: ", zzz); \
52 } \
53 pr_debug("%02x ", (unsigned char) (buff)[zzz]); \
54 } \
55 if ((len + 1) % 16) \
56 pr_debug("\n"); \
57}
58
59extern struct list_head g_tiqn_list;
60extern spinlock_t tiqn_lock;
61
62/*
63 * Called with cmd->r2t_lock held.
64 */
65int iscsit_add_r2t_to_list(
66 struct iscsi_cmd *cmd,
67 u32 offset,
68 u32 xfer_len,
69 int recovery,
70 u32 r2t_sn)
71{
72 struct iscsi_r2t *r2t;
73
74 r2t = kmem_cache_zalloc(lio_r2t_cache, GFP_ATOMIC);
75 if (!r2t) {
76 pr_err("Unable to allocate memory for struct iscsi_r2t.\n");
77 return -1;
78 }
79 INIT_LIST_HEAD(&r2t->r2t_list);
80
81 r2t->recovery_r2t = recovery;
82 r2t->r2t_sn = (!r2t_sn) ? cmd->r2t_sn++ : r2t_sn;
83 r2t->offset = offset;
84 r2t->xfer_len = xfer_len;
85 list_add_tail(&r2t->r2t_list, &cmd->cmd_r2t_list);
86 spin_unlock_bh(&cmd->r2t_lock);
87
88 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, ISTATE_SEND_R2T);
89
90 spin_lock_bh(&cmd->r2t_lock);
91 return 0;
92}
93
94struct iscsi_r2t *iscsit_get_r2t_for_eos(
95 struct iscsi_cmd *cmd,
96 u32 offset,
97 u32 length)
98{
99 struct iscsi_r2t *r2t;
100
101 spin_lock_bh(&cmd->r2t_lock);
102 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
103 if ((r2t->offset <= offset) &&
104 (r2t->offset + r2t->xfer_len) >= (offset + length)) {
105 spin_unlock_bh(&cmd->r2t_lock);
106 return r2t;
107 }
108 }
109 spin_unlock_bh(&cmd->r2t_lock);
110
111 pr_err("Unable to locate R2T for Offset: %u, Length:"
112 " %u\n", offset, length);
113 return NULL;
114}
115
116struct iscsi_r2t *iscsit_get_r2t_from_list(struct iscsi_cmd *cmd)
117{
118 struct iscsi_r2t *r2t;
119
120 spin_lock_bh(&cmd->r2t_lock);
121 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
122 if (!r2t->sent_r2t) {
123 spin_unlock_bh(&cmd->r2t_lock);
124 return r2t;
125 }
126 }
127 spin_unlock_bh(&cmd->r2t_lock);
128
129 pr_err("Unable to locate next R2T to send for ITT:"
130 " 0x%08x.\n", cmd->init_task_tag);
131 return NULL;
132}
133
134/*
135 * Called with cmd->r2t_lock held.
136 */
137void iscsit_free_r2t(struct iscsi_r2t *r2t, struct iscsi_cmd *cmd)
138{
139 list_del(&r2t->r2t_list);
140 kmem_cache_free(lio_r2t_cache, r2t);
141}
142
143void iscsit_free_r2ts_from_list(struct iscsi_cmd *cmd)
144{
145 struct iscsi_r2t *r2t, *r2t_tmp;
146
147 spin_lock_bh(&cmd->r2t_lock);
148 list_for_each_entry_safe(r2t, r2t_tmp, &cmd->cmd_r2t_list, r2t_list)
149 iscsit_free_r2t(r2t, cmd);
150 spin_unlock_bh(&cmd->r2t_lock);
151}
152
153/*
154 * May be called from software interrupt (timer) context for allocating
155 * iSCSI NopINs.
156 */
157struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *conn, gfp_t gfp_mask)
158{
159 struct iscsi_cmd *cmd;
160
161 cmd = kmem_cache_zalloc(lio_cmd_cache, gfp_mask);
162 if (!cmd) {
163 pr_err("Unable to allocate memory for struct iscsi_cmd.\n");
164 return NULL;
165 }
166
167 cmd->conn = conn;
168 INIT_LIST_HEAD(&cmd->i_list);
169 INIT_LIST_HEAD(&cmd->datain_list);
170 INIT_LIST_HEAD(&cmd->cmd_r2t_list);
171 init_completion(&cmd->reject_comp);
172 spin_lock_init(&cmd->datain_lock);
173 spin_lock_init(&cmd->dataout_timeout_lock);
174 spin_lock_init(&cmd->istate_lock);
175 spin_lock_init(&cmd->error_lock);
176 spin_lock_init(&cmd->r2t_lock);
177
178 return cmd;
179}
180
181/*
182 * Called from iscsi_handle_scsi_cmd()
183 */
184struct iscsi_cmd *iscsit_allocate_se_cmd(
185 struct iscsi_conn *conn,
186 u32 data_length,
187 int data_direction,
188 int iscsi_task_attr)
189{
190 struct iscsi_cmd *cmd;
191 struct se_cmd *se_cmd;
192 int sam_task_attr;
193
194 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
195 if (!cmd)
196 return NULL;
197
198 cmd->data_direction = data_direction;
199 cmd->data_length = data_length;
200 /*
201 * Figure out the SAM Task Attribute for the incoming SCSI CDB
202 */
203 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
204 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
205 sam_task_attr = MSG_SIMPLE_TAG;
206 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
207 sam_task_attr = MSG_ORDERED_TAG;
208 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
209 sam_task_attr = MSG_HEAD_TAG;
210 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
211 sam_task_attr = MSG_ACA_TAG;
212 else {
213 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
214 " MSG_SIMPLE_TAG\n", iscsi_task_attr);
215 sam_task_attr = MSG_SIMPLE_TAG;
216 }
217
218 se_cmd = &cmd->se_cmd;
219 /*
220 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
221 */
222 transport_init_se_cmd(se_cmd, &lio_target_fabric_configfs->tf_ops,
223 conn->sess->se_sess, data_length, data_direction,
224 sam_task_attr, &cmd->sense_buffer[0]);
225 return cmd;
226}
227
228struct iscsi_cmd *iscsit_allocate_se_cmd_for_tmr(
229 struct iscsi_conn *conn,
230 u8 function)
231{
232 struct iscsi_cmd *cmd;
233 struct se_cmd *se_cmd;
234 u8 tcm_function;
235
236 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
237 if (!cmd)
238 return NULL;
239
240 cmd->data_direction = DMA_NONE;
241
242 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
243 if (!cmd->tmr_req) {
244 pr_err("Unable to allocate memory for"
245 " Task Management command!\n");
ba773669 246 goto out;
e48354ce
NB		 247 }
248 /*
249 * TASK_REASSIGN for ERL=2 / connection stays inside of
250 * LIO-Target $FABRIC_MOD
251 */
252 if (function == ISCSI_TM_FUNC_TASK_REASSIGN)
253 return cmd;
254
255 se_cmd = &cmd->se_cmd;
256 /*
257 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
258 */
259 transport_init_se_cmd(se_cmd, &lio_target_fabric_configfs->tf_ops,
260 conn->sess->se_sess, 0, DMA_NONE,
261 MSG_SIMPLE_TAG, &cmd->sense_buffer[0]);
262
263 switch (function) {
264 case ISCSI_TM_FUNC_ABORT_TASK:
265 tcm_function = TMR_ABORT_TASK;
266 break;
267 case ISCSI_TM_FUNC_ABORT_TASK_SET:
268 tcm_function = TMR_ABORT_TASK_SET;
269 break;
270 case ISCSI_TM_FUNC_CLEAR_ACA:
271 tcm_function = TMR_CLEAR_ACA;
272 break;
273 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
274 tcm_function = TMR_CLEAR_TASK_SET;
275 break;
276 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
277 tcm_function = TMR_LUN_RESET;
278 break;
279 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
280 tcm_function = TMR_TARGET_WARM_RESET;
281 break;
282 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
283 tcm_function = TMR_TARGET_COLD_RESET;
284 break;
285 default:
286 pr_err("Unknown iSCSI TMR Function:"
287 " 0x%02x\n", function);
288 goto out;
289 }
290
291 se_cmd->se_tmr_req = core_tmr_alloc_req(se_cmd,
292 (void *)cmd->tmr_req, tcm_function);
293 if (!se_cmd->se_tmr_req)
294 goto out;
295
296 cmd->tmr_req->se_tmr_req = se_cmd->se_tmr_req;
297
298 return cmd;
299out:
300 iscsit_release_cmd(cmd);
e48354ce
NB		 301 return NULL;
302}
303
304int iscsit_decide_list_to_build(
305 struct iscsi_cmd *cmd,
306 u32 immediate_data_length)
307{
308 struct iscsi_build_list bl;
309 struct iscsi_conn *conn = cmd->conn;
310 struct iscsi_session *sess = conn->sess;
311 struct iscsi_node_attrib *na;
312
313 if (sess->sess_ops->DataSequenceInOrder &&
314 sess->sess_ops->DataPDUInOrder)
315 return 0;
316
317 if (cmd->data_direction == DMA_NONE)
318 return 0;
319
320 na = iscsit_tpg_get_node_attrib(sess);
321 memset(&bl, 0, sizeof(struct iscsi_build_list));
322
323 if (cmd->data_direction == DMA_FROM_DEVICE) {
324 bl.data_direction = ISCSI_PDU_READ;
325 bl.type = PDULIST_NORMAL;
326 if (na->random_datain_pdu_offsets)
327 bl.randomize |= RANDOM_DATAIN_PDU_OFFSETS;
328 if (na->random_datain_seq_offsets)
329 bl.randomize |= RANDOM_DATAIN_SEQ_OFFSETS;
330 } else {
331 bl.data_direction = ISCSI_PDU_WRITE;
332 bl.immediate_data_length = immediate_data_length;
333 if (na->random_r2t_offsets)
334 bl.randomize |= RANDOM_R2T_OFFSETS;
335
336 if (!cmd->immediate_data && !cmd->unsolicited_data)
337 bl.type = PDULIST_NORMAL;
338 else if (cmd->immediate_data && !cmd->unsolicited_data)
339 bl.type = PDULIST_IMMEDIATE;
340 else if (!cmd->immediate_data && cmd->unsolicited_data)
341 bl.type = PDULIST_UNSOLICITED;
342 else if (cmd->immediate_data && cmd->unsolicited_data)
343 bl.type = PDULIST_IMMEDIATE_AND_UNSOLICITED;
344 }
345
346 return iscsit_do_build_list(cmd, &bl);
347}
348
349struct iscsi_seq *iscsit_get_seq_holder_for_datain(
350 struct iscsi_cmd *cmd,
351 u32 seq_send_order)
352{
353 u32 i;
354
355 for (i = 0; i < cmd->seq_count; i++)
356 if (cmd->seq_list[i].seq_send_order == seq_send_order)
357 return &cmd->seq_list[i];
358
359 return NULL;
360}
361
362struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsi_cmd *cmd)
363{
364 u32 i;
365
366 if (!cmd->seq_list) {
367 pr_err("struct iscsi_cmd->seq_list is NULL!\n");
368 return NULL;
369 }
370
371 for (i = 0; i < cmd->seq_count; i++) {
372 if (cmd->seq_list[i].type != SEQTYPE_NORMAL)
373 continue;
374 if (cmd->seq_list[i].seq_send_order == cmd->seq_send_order) {
375 cmd->seq_send_order++;
376 return &cmd->seq_list[i];
377 }
378 }
379
380 return NULL;
381}
382
383struct iscsi_r2t *iscsit_get_holder_for_r2tsn(
384 struct iscsi_cmd *cmd,
385 u32 r2t_sn)
386{
387 struct iscsi_r2t *r2t;
388
389 spin_lock_bh(&cmd->r2t_lock);
390 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
391 if (r2t->r2t_sn == r2t_sn) {
392 spin_unlock_bh(&cmd->r2t_lock);
393 return r2t;
394 }
395 }
396 spin_unlock_bh(&cmd->r2t_lock);
397
398 return NULL;
399}
400
401static inline int iscsit_check_received_cmdsn(struct iscsi_session *sess, u32 cmdsn)
402{
403 int ret;
404
405 /*
406 * This is the proper method of checking received CmdSN against
407 * ExpCmdSN and MaxCmdSN values, as well as accounting for out
408 * or order CmdSNs due to multiple connection sessions and/or
409 * CRC failures.
410 */
411 if (iscsi_sna_gt(cmdsn, sess->max_cmd_sn)) {
412 pr_err("Received CmdSN: 0x%08x is greater than"
413 " MaxCmdSN: 0x%08x, protocol error.\n", cmdsn,
414 sess->max_cmd_sn);
415 ret = CMDSN_ERROR_CANNOT_RECOVER;
416
417 } else if (cmdsn == sess->exp_cmd_sn) {
418 sess->exp_cmd_sn++;
419 pr_debug("Received CmdSN matches ExpCmdSN,"
420 " incremented ExpCmdSN to: 0x%08x\n",
421 sess->exp_cmd_sn);
422 ret = CMDSN_NORMAL_OPERATION;
423
424 } else if (iscsi_sna_gt(cmdsn, sess->exp_cmd_sn)) {
425 pr_debug("Received CmdSN: 0x%08x is greater"
426 " than ExpCmdSN: 0x%08x, not acknowledging.\n",
427 cmdsn, sess->exp_cmd_sn);
428 ret = CMDSN_HIGHER_THAN_EXP;
429
430 } else {
431 pr_err("Received CmdSN: 0x%08x is less than"
432 " ExpCmdSN: 0x%08x, ignoring.\n", cmdsn,
433 sess->exp_cmd_sn);
434 ret = CMDSN_LOWER_THAN_EXP;
435 }
436
437 return ret;
438}
439
440/*
441 * Commands may be received out of order if MC/S is in use.
442 * Ensure they are executed in CmdSN order.
443 */
444int iscsit_sequence_cmd(
445 struct iscsi_conn *conn,
446 struct iscsi_cmd *cmd,
447 u32 cmdsn)
448{
449 int ret;
450 int cmdsn_ret;
451
452 mutex_lock(&conn->sess->cmdsn_mutex);
453
454 cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, cmdsn);
455 switch (cmdsn_ret) {
456 case CMDSN_NORMAL_OPERATION:
457 ret = iscsit_execute_cmd(cmd, 0);
458 if ((ret >= 0) && !list_empty(&conn->sess->sess_ooo_cmdsn_list))
459 iscsit_execute_ooo_cmdsns(conn->sess);
460 break;
461 case CMDSN_HIGHER_THAN_EXP:
462 ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, cmdsn);
463 break;
464 case CMDSN_LOWER_THAN_EXP:
465 cmd->i_state = ISTATE_REMOVE;
466 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
467 ret = cmdsn_ret;
468 break;
469 default:
470 ret = cmdsn_ret;
471 break;
472 }
473 mutex_unlock(&conn->sess->cmdsn_mutex);
474
475 return ret;
476}
477
478int iscsit_check_unsolicited_dataout(struct iscsi_cmd *cmd, unsigned char *buf)
479{
480 struct iscsi_conn *conn = cmd->conn;
481 struct se_cmd *se_cmd = &cmd->se_cmd;
482 struct iscsi_data *hdr = (struct iscsi_data *) buf;
483 u32 payload_length = ntoh24(hdr->dlength);
484
485 if (conn->sess->sess_ops->InitialR2T) {
486 pr_err("Received unexpected unsolicited data"
487 " while InitialR2T=Yes, protocol error.\n");
488 transport_send_check_condition_and_sense(se_cmd,
489 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
490 return -1;
491 }
492
493 if ((cmd->first_burst_len + payload_length) >
494 conn->sess->sess_ops->FirstBurstLength) {
495 pr_err("Total %u bytes exceeds FirstBurstLength: %u"
496 " for this Unsolicited DataOut Burst.\n",
497 (cmd->first_burst_len + payload_length),
498 conn->sess->sess_ops->FirstBurstLength);
499 transport_send_check_condition_and_sense(se_cmd,
500 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
501 return -1;
502 }
503
504 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))
505 return 0;
506
507 if (((cmd->first_burst_len + payload_length) != cmd->data_length) &&
508 ((cmd->first_burst_len + payload_length) !=
509 conn->sess->sess_ops->FirstBurstLength)) {
510 pr_err("Unsolicited non-immediate data received %u"
511 " does not equal FirstBurstLength: %u, and does"
512 " not equal ExpXferLen %u.\n",
513 (cmd->first_burst_len + payload_length),
514 conn->sess->sess_ops->FirstBurstLength, cmd->data_length);
515 transport_send_check_condition_and_sense(se_cmd,
516 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
517 return -1;
518 }
519 return 0;
520}
521
522struct iscsi_cmd *iscsit_find_cmd_from_itt(
523 struct iscsi_conn *conn,
524 u32 init_task_tag)
525{
526 struct iscsi_cmd *cmd;
527
528 spin_lock_bh(&conn->cmd_lock);
529 list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
530 if (cmd->init_task_tag == init_task_tag) {
531 spin_unlock_bh(&conn->cmd_lock);
532 return cmd;
533 }
534 }
535 spin_unlock_bh(&conn->cmd_lock);
536
537 pr_err("Unable to locate ITT: 0x%08x on CID: %hu",
538 init_task_tag, conn->cid);
539 return NULL;
540}
541
542struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump(
543 struct iscsi_conn *conn,
544 u32 init_task_tag,
545 u32 length)
546{
547 struct iscsi_cmd *cmd;
548
549 spin_lock_bh(&conn->cmd_lock);
550 list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
551 if (cmd->init_task_tag == init_task_tag) {
552 spin_unlock_bh(&conn->cmd_lock);
553 return cmd;
554 }
555 }
556 spin_unlock_bh(&conn->cmd_lock);
557
558 pr_err("Unable to locate ITT: 0x%08x on CID: %hu,"
559 " dumping payload\n", init_task_tag, conn->cid);
560 if (length)
561 iscsit_dump_data_payload(conn, length, 1);
562
563 return NULL;
564}
565
566struct iscsi_cmd *iscsit_find_cmd_from_ttt(
567 struct iscsi_conn *conn,
568 u32 targ_xfer_tag)
569{
570 struct iscsi_cmd *cmd = NULL;
571
572 spin_lock_bh(&conn->cmd_lock);
573 list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
574 if (cmd->targ_xfer_tag == targ_xfer_tag) {
575 spin_unlock_bh(&conn->cmd_lock);
576 return cmd;
577 }
578 }
579 spin_unlock_bh(&conn->cmd_lock);
580
581 pr_err("Unable to locate TTT: 0x%08x on CID: %hu\n",
582 targ_xfer_tag, conn->cid);
583 return NULL;
584}
585
586int iscsit_find_cmd_for_recovery(
587 struct iscsi_session *sess,
588 struct iscsi_cmd **cmd_ptr,
589 struct iscsi_conn_recovery **cr_ptr,
590 u32 init_task_tag)
591{
592 struct iscsi_cmd *cmd = NULL;
593 struct iscsi_conn_recovery *cr;
594 /*
595 * Scan through the inactive connection recovery list's command list.
596 * If init_task_tag matches the command is still alligent.
597 */
598 spin_lock(&sess->cr_i_lock);
599 list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) {
600 spin_lock(&cr->conn_recovery_cmd_lock);
601 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_list) {
602 if (cmd->init_task_tag == init_task_tag) {
603 spin_unlock(&cr->conn_recovery_cmd_lock);
604 spin_unlock(&sess->cr_i_lock);
605
606 *cr_ptr = cr;
607 *cmd_ptr = cmd;
608 return -2;
609 }
610 }
611 spin_unlock(&cr->conn_recovery_cmd_lock);
612 }
613 spin_unlock(&sess->cr_i_lock);
614 /*
615 * Scan through the active connection recovery list's command list.
616 * If init_task_tag matches the command is ready to be reassigned.
617 */
618 spin_lock(&sess->cr_a_lock);
619 list_for_each_entry(cr, &sess->cr_active_list, cr_list) {
620 spin_lock(&cr->conn_recovery_cmd_lock);
621 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_list) {
622 if (cmd->init_task_tag == init_task_tag) {
623 spin_unlock(&cr->conn_recovery_cmd_lock);
624 spin_unlock(&sess->cr_a_lock);
625
626 *cr_ptr = cr;
627 *cmd_ptr = cmd;
628 return 0;
629 }
630 }
631 spin_unlock(&cr->conn_recovery_cmd_lock);
632 }
633 spin_unlock(&sess->cr_a_lock);
634
635 return -1;
636}
637
638void iscsit_add_cmd_to_immediate_queue(
639 struct iscsi_cmd *cmd,
640 struct iscsi_conn *conn,
641 u8 state)
642{
643 struct iscsi_queue_req *qr;
644
645 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
646 if (!qr) {
647 pr_err("Unable to allocate memory for"
648 " struct iscsi_queue_req\n");
649 return;
650 }
651 INIT_LIST_HEAD(&qr->qr_list);
652 qr->cmd = cmd;
653 qr->state = state;
654
655 spin_lock_bh(&conn->immed_queue_lock);
656 list_add_tail(&qr->qr_list, &conn->immed_queue_list);
657 atomic_inc(&cmd->immed_queue_count);
658 atomic_set(&conn->check_immediate_queue, 1);
659 spin_unlock_bh(&conn->immed_queue_lock);
660
661 wake_up_process(conn->thread_set->tx_thread);
662}
663
664struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *conn)
665{
666 struct iscsi_queue_req *qr;
667
668 spin_lock_bh(&conn->immed_queue_lock);
669 if (list_empty(&conn->immed_queue_list)) {
670 spin_unlock_bh(&conn->immed_queue_lock);
671 return NULL;
672 }
673 list_for_each_entry(qr, &conn->immed_queue_list, qr_list)
674 break;
675
676 list_del(&qr->qr_list);
677 if (qr->cmd)
678 atomic_dec(&qr->cmd->immed_queue_count);
679 spin_unlock_bh(&conn->immed_queue_lock);
680
681 return qr;
682}
683
684static void iscsit_remove_cmd_from_immediate_queue(
685 struct iscsi_cmd *cmd,
686 struct iscsi_conn *conn)
687{
688 struct iscsi_queue_req *qr, *qr_tmp;
689
690 spin_lock_bh(&conn->immed_queue_lock);
691 if (!atomic_read(&cmd->immed_queue_count)) {
692 spin_unlock_bh(&conn->immed_queue_lock);
693 return;
694 }
695
696 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
697 if (qr->cmd != cmd)
698 continue;
699
700 atomic_dec(&qr->cmd->immed_queue_count);
701 list_del(&qr->qr_list);
702 kmem_cache_free(lio_qr_cache, qr);
703 }
704 spin_unlock_bh(&conn->immed_queue_lock);
705
706 if (atomic_read(&cmd->immed_queue_count)) {
707 pr_err("ITT: 0x%08x immed_queue_count: %d\n",
708 cmd->init_task_tag,
709 atomic_read(&cmd->immed_queue_count));
710 }
711}
712
713void iscsit_add_cmd_to_response_queue(
714 struct iscsi_cmd *cmd,
715 struct iscsi_conn *conn,
716 u8 state)
717{
718 struct iscsi_queue_req *qr;
719
720 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
721 if (!qr) {
722 pr_err("Unable to allocate memory for"
723 " struct iscsi_queue_req\n");
724 return;
725 }
726 INIT_LIST_HEAD(&qr->qr_list);
727 qr->cmd = cmd;
728 qr->state = state;
729
730 spin_lock_bh(&conn->response_queue_lock);
731 list_add_tail(&qr->qr_list, &conn->response_queue_list);
732 atomic_inc(&cmd->response_queue_count);
733 spin_unlock_bh(&conn->response_queue_lock);
734
735 wake_up_process(conn->thread_set->tx_thread);
736}
737
738struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *conn)
739{
740 struct iscsi_queue_req *qr;
741
742 spin_lock_bh(&conn->response_queue_lock);
743 if (list_empty(&conn->response_queue_list)) {
744 spin_unlock_bh(&conn->response_queue_lock);
745 return NULL;
746 }
747
748 list_for_each_entry(qr, &conn->response_queue_list, qr_list)
749 break;
750
751 list_del(&qr->qr_list);
752 if (qr->cmd)
753 atomic_dec(&qr->cmd->response_queue_count);
754 spin_unlock_bh(&conn->response_queue_lock);
755
756 return qr;
757}
758
759static void iscsit_remove_cmd_from_response_queue(
760 struct iscsi_cmd *cmd,
761 struct iscsi_conn *conn)
762{
763 struct iscsi_queue_req *qr, *qr_tmp;
764
765 spin_lock_bh(&conn->response_queue_lock);
766 if (!atomic_read(&cmd->response_queue_count)) {
767 spin_unlock_bh(&conn->response_queue_lock);
768 return;
769 }
770
771 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
772 qr_list) {
773 if (qr->cmd != cmd)
774 continue;
775
776 atomic_dec(&qr->cmd->response_queue_count);
777 list_del(&qr->qr_list);
778 kmem_cache_free(lio_qr_cache, qr);
779 }
780 spin_unlock_bh(&conn->response_queue_lock);
781
782 if (atomic_read(&cmd->response_queue_count)) {
783 pr_err("ITT: 0x%08x response_queue_count: %d\n",
784 cmd->init_task_tag,
785 atomic_read(&cmd->response_queue_count));
786 }
787}
788
789void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn)
790{
791 struct iscsi_queue_req *qr, *qr_tmp;
792
793 spin_lock_bh(&conn->immed_queue_lock);
794 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
795 list_del(&qr->qr_list);
796 if (qr->cmd)
797 atomic_dec(&qr->cmd->immed_queue_count);
798
799 kmem_cache_free(lio_qr_cache, qr);
800 }
801 spin_unlock_bh(&conn->immed_queue_lock);
802
803 spin_lock_bh(&conn->response_queue_lock);
804 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
805 qr_list) {
806 list_del(&qr->qr_list);
807 if (qr->cmd)
808 atomic_dec(&qr->cmd->response_queue_count);
809
810 kmem_cache_free(lio_qr_cache, qr);
811 }
812 spin_unlock_bh(&conn->response_queue_lock);
813}
814
815void iscsit_release_cmd(struct iscsi_cmd *cmd)
816{
817 struct iscsi_conn *conn = cmd->conn;
818 int i;
819
820 iscsit_free_r2ts_from_list(cmd);
821 iscsit_free_all_datain_reqs(cmd);
822
823 kfree(cmd->buf_ptr);
824 kfree(cmd->pdu_list);
825 kfree(cmd->seq_list);
826 kfree(cmd->tmr_req);
827 kfree(cmd->iov_data);
828
829 for (i = 0; i < cmd->t_mem_sg_nents; i++)
830 __free_page(sg_page(&cmd->t_mem_sg[i]));
831
832 kfree(cmd->t_mem_sg);
833
834 if (conn) {
835 iscsit_remove_cmd_from_immediate_queue(cmd, conn);
836 iscsit_remove_cmd_from_response_queue(cmd, conn);
837 }
838
839 kmem_cache_free(lio_cmd_cache, cmd);
840}
841
842int iscsit_check_session_usage_count(struct iscsi_session *sess)
843{
844 spin_lock_bh(&sess->session_usage_lock);
845 if (sess->session_usage_count != 0) {
846 sess->session_waiting_on_uc = 1;
847 spin_unlock_bh(&sess->session_usage_lock);
848 if (in_interrupt())
849 return 2;
850
851 wait_for_completion(&sess->session_waiting_on_uc_comp);
852 return 1;
853 }
854 spin_unlock_bh(&sess->session_usage_lock);
855
856 return 0;
857}
858
859void iscsit_dec_session_usage_count(struct iscsi_session *sess)
860{
861 spin_lock_bh(&sess->session_usage_lock);
862 sess->session_usage_count--;
863
864 if (!sess->session_usage_count && sess->session_waiting_on_uc)
865 complete(&sess->session_waiting_on_uc_comp);
866
867 spin_unlock_bh(&sess->session_usage_lock);
868}
869
870void iscsit_inc_session_usage_count(struct iscsi_session *sess)
871{
872 spin_lock_bh(&sess->session_usage_lock);
873 sess->session_usage_count++;
874 spin_unlock_bh(&sess->session_usage_lock);
875}
876
e48354ce
NB		 877/*
878 * Setup conn->if_marker and conn->of_marker values based upon
879 * the initial marker-less interval. (see iSCSI v19 A.2)
880 */
881int iscsit_set_sync_and_steering_values(struct iscsi_conn *conn)
882{
883 int login_ifmarker_count = 0, login_ofmarker_count = 0, next_marker = 0;
884 /*
885 * IFMarkInt and OFMarkInt are negotiated as 32-bit words.
886 */
887 u32 IFMarkInt = (conn->conn_ops->IFMarkInt * 4);
888 u32 OFMarkInt = (conn->conn_ops->OFMarkInt * 4);
889
890 if (conn->conn_ops->OFMarker) {
891 /*
892 * Account for the first Login Command received not
893 * via iscsi_recv_msg().
894 */
895 conn->of_marker += ISCSI_HDR_LEN;
896 if (conn->of_marker <= OFMarkInt) {
897 conn->of_marker = (OFMarkInt - conn->of_marker);
898 } else {
899 login_ofmarker_count = (conn->of_marker / OFMarkInt);
900 next_marker = (OFMarkInt * (login_ofmarker_count + 1)) +
901 (login_ofmarker_count * MARKER_SIZE);
902 conn->of_marker = (next_marker - conn->of_marker);
903 }
904 conn->of_marker_offset = 0;
905 pr_debug("Setting OFMarker value to %u based on Initial"
906 " Markerless Interval.\n", conn->of_marker);
907 }
908
909 if (conn->conn_ops->IFMarker) {
910 if (conn->if_marker <= IFMarkInt) {
911 conn->if_marker = (IFMarkInt - conn->if_marker);
912 } else {
913 login_ifmarker_count = (conn->if_marker / IFMarkInt);
914 next_marker = (IFMarkInt * (login_ifmarker_count + 1)) +
915 (login_ifmarker_count * MARKER_SIZE);
916 conn->if_marker = (next_marker - conn->if_marker);
917 }
918 pr_debug("Setting IFMarker value to %u based on Initial"
919 " Markerless Interval.\n", conn->if_marker);
920 }
921
922 return 0;
923}
924
925struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid)
926{
927 struct iscsi_conn *conn;
928
929 spin_lock_bh(&sess->conn_lock);
930 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
931 if ((conn->cid == cid) &&
932 (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) {
933 iscsit_inc_conn_usage_count(conn);
934 spin_unlock_bh(&sess->conn_lock);
935 return conn;
936 }
937 }
938 spin_unlock_bh(&sess->conn_lock);
939
940 return NULL;
941}
942
943struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid)
944{
945 struct iscsi_conn *conn;
946
947 spin_lock_bh(&sess->conn_lock);
948 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
949 if (conn->cid == cid) {
950 iscsit_inc_conn_usage_count(conn);
951 spin_lock(&conn->state_lock);
952 atomic_set(&conn->connection_wait_rcfr, 1);
953 spin_unlock(&conn->state_lock);
954 spin_unlock_bh(&sess->conn_lock);
955 return conn;
956 }
957 }
958 spin_unlock_bh(&sess->conn_lock);
959
960 return NULL;
961}
962
963void iscsit_check_conn_usage_count(struct iscsi_conn *conn)
964{
965 spin_lock_bh(&conn->conn_usage_lock);
966 if (conn->conn_usage_count != 0) {
967 conn->conn_waiting_on_uc = 1;
968 spin_unlock_bh(&conn->conn_usage_lock);
969
970 wait_for_completion(&conn->conn_waiting_on_uc_comp);
971 return;
972 }
973 spin_unlock_bh(&conn->conn_usage_lock);
974}
975
976void iscsit_dec_conn_usage_count(struct iscsi_conn *conn)
977{
978 spin_lock_bh(&conn->conn_usage_lock);
979 conn->conn_usage_count--;
980
981 if (!conn->conn_usage_count && conn->conn_waiting_on_uc)
982 complete(&conn->conn_waiting_on_uc_comp);
983
984 spin_unlock_bh(&conn->conn_usage_lock);
985}
986
987void iscsit_inc_conn_usage_count(struct iscsi_conn *conn)
988{
989 spin_lock_bh(&conn->conn_usage_lock);
990 conn->conn_usage_count++;
991 spin_unlock_bh(&conn->conn_usage_lock);
992}
993
994static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response)
995{
996 u8 state;
997 struct iscsi_cmd *cmd;
998
999 cmd = iscsit_allocate_cmd(conn, GFP_ATOMIC);
1000 if (!cmd)
1001 return -1;
1002
1003 cmd->iscsi_opcode = ISCSI_OP_NOOP_IN;
1004 state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE :
1005 ISTATE_SEND_NOPIN_NO_RESPONSE;
1006 cmd->init_task_tag = 0xFFFFFFFF;
1007 spin_lock_bh(&conn->sess->ttt_lock);
1008 cmd->targ_xfer_tag = (want_response) ? conn->sess->targ_xfer_tag++ :
1009 0xFFFFFFFF;
1010 if (want_response && (cmd->targ_xfer_tag == 0xFFFFFFFF))
1011 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
1012 spin_unlock_bh(&conn->sess->ttt_lock);
1013
1014 spin_lock_bh(&conn->cmd_lock);
1015 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1016 spin_unlock_bh(&conn->cmd_lock);
1017
1018 if (want_response)
1019 iscsit_start_nopin_response_timer(conn);
1020 iscsit_add_cmd_to_immediate_queue(cmd, conn, state);
1021
1022 return 0;
1023}
1024
1025static void iscsit_handle_nopin_response_timeout(unsigned long data)
1026{
1027 struct iscsi_conn *conn = (struct iscsi_conn *) data;
1028
1029 iscsit_inc_conn_usage_count(conn);
1030
1031 spin_lock_bh(&conn->nopin_timer_lock);
1032 if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) {
1033 spin_unlock_bh(&conn->nopin_timer_lock);
1034 iscsit_dec_conn_usage_count(conn);
1035 return;
1036 }
1037
1038 pr_debug("Did not receive response to NOPIN on CID: %hu on"
1039 " SID: %u, failing connection.\n", conn->cid,
1040 conn->sess->sid);
1041 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
1042 spin_unlock_bh(&conn->nopin_timer_lock);
1043
1044 {
1045 struct iscsi_portal_group *tpg = conn->sess->tpg;
1046 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
1047
1048 if (tiqn) {
1049 spin_lock_bh(&tiqn->sess_err_stats.lock);
1050 strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
1051 (void *)conn->sess->sess_ops->InitiatorName);
1052 tiqn->sess_err_stats.last_sess_failure_type =
1053 ISCSI_SESS_ERR_CXN_TIMEOUT;
1054 tiqn->sess_err_stats.cxn_timeout_errors++;
1055 conn->sess->conn_timeout_errors++;
1056 spin_unlock_bh(&tiqn->sess_err_stats.lock);
1057 }
1058 }
1059
1060 iscsit_cause_connection_reinstatement(conn, 0);
1061 iscsit_dec_conn_usage_count(conn);
1062}
1063
1064void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn)
1065{
1066 struct iscsi_session *sess = conn->sess;
1067 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1068
1069 spin_lock_bh(&conn->nopin_timer_lock);
1070 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
1071 spin_unlock_bh(&conn->nopin_timer_lock);
1072 return;
1073 }
1074
1075 mod_timer(&conn->nopin_response_timer,
1076 (get_jiffies_64() + na->nopin_response_timeout * HZ));
1077 spin_unlock_bh(&conn->nopin_timer_lock);
1078}
1079
1080/*
1081 * Called with conn->nopin_timer_lock held.
1082 */
1083void iscsit_start_nopin_response_timer(struct iscsi_conn *conn)
1084{
1085 struct iscsi_session *sess = conn->sess;
1086 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1087
1088 spin_lock_bh(&conn->nopin_timer_lock);
1089 if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) {
1090 spin_unlock_bh(&conn->nopin_timer_lock);
1091 return;
1092 }
1093
1094 init_timer(&conn->nopin_response_timer);
1095 conn->nopin_response_timer.expires =
1096 (get_jiffies_64() + na->nopin_response_timeout * HZ);
1097 conn->nopin_response_timer.data = (unsigned long)conn;
1098 conn->nopin_response_timer.function = iscsit_handle_nopin_response_timeout;
1099 conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP;
1100 conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING;
1101 add_timer(&conn->nopin_response_timer);
1102
1103 pr_debug("Started NOPIN Response Timer on CID: %d to %u"
1104 " seconds\n", conn->cid, na->nopin_response_timeout);
1105 spin_unlock_bh(&conn->nopin_timer_lock);
1106}
1107
1108void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn)
1109{
1110 spin_lock_bh(&conn->nopin_timer_lock);
1111 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
1112 spin_unlock_bh(&conn->nopin_timer_lock);
1113 return;
1114 }
1115 conn->nopin_response_timer_flags |= ISCSI_TF_STOP;
1116 spin_unlock_bh(&conn->nopin_timer_lock);
1117
1118 del_timer_sync(&conn->nopin_response_timer);
1119
1120 spin_lock_bh(&conn->nopin_timer_lock);
1121 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
1122 spin_unlock_bh(&conn->nopin_timer_lock);
1123}
1124
1125static void iscsit_handle_nopin_timeout(unsigned long data)
1126{
1127 struct iscsi_conn *conn = (struct iscsi_conn *) data;
1128
1129 iscsit_inc_conn_usage_count(conn);
1130
1131 spin_lock_bh(&conn->nopin_timer_lock);
1132 if (conn->nopin_timer_flags & ISCSI_TF_STOP) {
1133 spin_unlock_bh(&conn->nopin_timer_lock);
1134 iscsit_dec_conn_usage_count(conn);
1135 return;
1136 }
1137 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1138 spin_unlock_bh(&conn->nopin_timer_lock);
1139
1140 iscsit_add_nopin(conn, 1);
1141 iscsit_dec_conn_usage_count(conn);
1142}
1143
1144/*
1145 * Called with conn->nopin_timer_lock held.
1146 */
1147void __iscsit_start_nopin_timer(struct iscsi_conn *conn)
1148{
1149 struct iscsi_session *sess = conn->sess;
1150 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1151 /*
1152 * NOPIN timeout is disabled.
1153 */
1154 if (!na->nopin_timeout)
1155 return;
1156
1157 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING)
1158 return;
1159
1160 init_timer(&conn->nopin_timer);
1161 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1162 conn->nopin_timer.data = (unsigned long)conn;
1163 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1164 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1165 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1166 add_timer(&conn->nopin_timer);
1167
1168 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1169 " interval\n", conn->cid, na->nopin_timeout);
1170}
1171
1172void iscsit_start_nopin_timer(struct iscsi_conn *conn)
1173{
1174 struct iscsi_session *sess = conn->sess;
1175 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1176 /*
1177 * NOPIN timeout is disabled..
1178 */
1179 if (!na->nopin_timeout)
1180 return;
1181
1182 spin_lock_bh(&conn->nopin_timer_lock);
1183 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) {
1184 spin_unlock_bh(&conn->nopin_timer_lock);
1185 return;
1186 }
1187
1188 init_timer(&conn->nopin_timer);
1189 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1190 conn->nopin_timer.data = (unsigned long)conn;
1191 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1192 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1193 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1194 add_timer(&conn->nopin_timer);
1195
1196 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1197 " interval\n", conn->cid, na->nopin_timeout);
1198 spin_unlock_bh(&conn->nopin_timer_lock);
1199}
1200
1201void iscsit_stop_nopin_timer(struct iscsi_conn *conn)
1202{
1203 spin_lock_bh(&conn->nopin_timer_lock);
1204 if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) {
1205 spin_unlock_bh(&conn->nopin_timer_lock);
1206 return;
1207 }
1208 conn->nopin_timer_flags |= ISCSI_TF_STOP;
1209 spin_unlock_bh(&conn->nopin_timer_lock);
1210
1211 del_timer_sync(&conn->nopin_timer);
1212
1213 spin_lock_bh(&conn->nopin_timer_lock);
1214 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1215 spin_unlock_bh(&conn->nopin_timer_lock);
1216}
1217
1218int iscsit_send_tx_data(
1219 struct iscsi_cmd *cmd,
1220 struct iscsi_conn *conn,
1221 int use_misc)
1222{
1223 int tx_sent, tx_size;
1224 u32 iov_count;
1225 struct kvec *iov;
1226
1227send_data:
1228 tx_size = cmd->tx_size;
1229
1230 if (!use_misc) {
1231 iov = &cmd->iov_data[0];
1232 iov_count = cmd->iov_data_count;
1233 } else {
1234 iov = &cmd->iov_misc[0];
1235 iov_count = cmd->iov_misc_count;
1236 }
1237
1238 tx_sent = tx_data(conn, &iov[0], iov_count, tx_size);
1239 if (tx_size != tx_sent) {
1240 if (tx_sent == -EAGAIN) {
1241 pr_err("tx_data() returned -EAGAIN\n");
1242 goto send_data;
1243 } else
1244 return -1;
1245 }
1246 cmd->tx_size = 0;
1247
1248 return 0;
1249}
1250
1251int iscsit_fe_sendpage_sg(
1252 struct iscsi_cmd *cmd,
1253 struct iscsi_conn *conn)
1254{
1255 struct scatterlist *sg = cmd->first_data_sg;
1256 struct kvec iov;
1257 u32 tx_hdr_size, data_len;
1258 u32 offset = cmd->first_data_sg_off;
1259 int tx_sent;
1260
1261send_hdr:
1262 tx_hdr_size = ISCSI_HDR_LEN;
1263 if (conn->conn_ops->HeaderDigest)
1264 tx_hdr_size += ISCSI_CRC_LEN;
1265
1266 iov.iov_base = cmd->pdu;
1267 iov.iov_len = tx_hdr_size;
1268
1269 tx_sent = tx_data(conn, &iov, 1, tx_hdr_size);
1270 if (tx_hdr_size != tx_sent) {
1271 if (tx_sent == -EAGAIN) {
1272 pr_err("tx_data() returned -EAGAIN\n");
1273 goto send_hdr;
1274 }
1275 return -1;
1276 }
1277
1278 data_len = cmd->tx_size - tx_hdr_size - cmd->padding;
1279 if (conn->conn_ops->DataDigest)
1280 data_len -= ISCSI_CRC_LEN;
1281
1282 /*
1283 * Perform sendpage() for each page in the scatterlist
1284 */
1285 while (data_len) {
1286 u32 space = (sg->length - offset);
1287 u32 sub_len = min_t(u32, data_len, space);
1288send_pg:
1289 tx_sent = conn->sock->ops->sendpage(conn->sock,
1290 sg_page(sg), sg->offset + offset, sub_len, 0);
1291 if (tx_sent != sub_len) {
1292 if (tx_sent == -EAGAIN) {
1293 pr_err("tcp_sendpage() returned"
1294 " -EAGAIN\n");
1295 goto send_pg;
1296 }
1297
1298 pr_err("tcp_sendpage() failure: %d\n",
1299 tx_sent);
1300 return -1;
1301 }
1302
1303 data_len -= sub_len;
1304 offset = 0;
1305 sg = sg_next(sg);
1306 }
1307
1308send_padding:
1309 if (cmd->padding) {
1310 struct kvec *iov_p =
1311 &cmd->iov_data[cmd->iov_data_count-1];
1312
1313 tx_sent = tx_data(conn, iov_p, 1, cmd->padding);
1314 if (cmd->padding != tx_sent) {
1315 if (tx_sent == -EAGAIN) {
1316 pr_err("tx_data() returned -EAGAIN\n");
1317 goto send_padding;
1318 }
1319 return -1;
1320 }
1321 }
1322
1323send_datacrc:
1324 if (conn->conn_ops->DataDigest) {
1325 struct kvec *iov_d =
1326 &cmd->iov_data[cmd->iov_data_count];
1327
1328 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN);
1329 if (ISCSI_CRC_LEN != tx_sent) {
1330 if (tx_sent == -EAGAIN) {
1331 pr_err("tx_data() returned -EAGAIN\n");
1332 goto send_datacrc;
1333 }
1334 return -1;
1335 }
1336 }
1337
1338 return 0;
1339}
1340
1341/*
1342 * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU
1343 * back to the Initiator when an expection condition occurs with the
1344 * errors set in status_class and status_detail.
1345 *
1346 * Parameters: iSCSI Connection, Status Class, Status Detail.
1347 * Returns: 0 on success, -1 on error.
1348 */
1349int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail)
1350{
1351 u8 iscsi_hdr[ISCSI_HDR_LEN];
1352 int err;
1353 struct kvec iov;
1354 struct iscsi_login_rsp *hdr;
1355
1356 iscsit_collect_login_stats(conn, status_class, status_detail);
1357
1358 memset(&iov, 0, sizeof(struct kvec));
1359 memset(&iscsi_hdr, 0x0, ISCSI_HDR_LEN);
1360
1361 hdr = (struct iscsi_login_rsp *)&iscsi_hdr;
1362 hdr->opcode = ISCSI_OP_LOGIN_RSP;
1363 hdr->status_class = status_class;
1364 hdr->status_detail = status_detail;
1365 hdr->itt = cpu_to_be32(conn->login_itt);
1366
1367 iov.iov_base = &iscsi_hdr;
1368 iov.iov_len = ISCSI_HDR_LEN;
1369
1370 PRINT_BUFF(iscsi_hdr, ISCSI_HDR_LEN);
1371
1372 err = tx_data(conn, &iov, 1, ISCSI_HDR_LEN);
1373 if (err != ISCSI_HDR_LEN) {
1374 pr_err("tx_data returned less than expected\n");
1375 return -1;
1376 }
1377
1378 return 0;
1379}
1380
1381void iscsit_print_session_params(struct iscsi_session *sess)
1382{
1383 struct iscsi_conn *conn;
1384
1385 pr_debug("-----------------------------[Session Params for"
1386 " SID: %u]-----------------------------\n", sess->sid);
1387 spin_lock_bh(&sess->conn_lock);
1388 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
1389 iscsi_dump_conn_ops(conn->conn_ops);
1390 spin_unlock_bh(&sess->conn_lock);
1391
1392 iscsi_dump_sess_ops(sess->sess_ops);
1393}
1394
1395static int iscsit_do_rx_data(
1396 struct iscsi_conn *conn,
1397 struct iscsi_data_count *count)
1398{
1399 int data = count->data_length, rx_loop = 0, total_rx = 0, iov_len;
2ff017f5 1400 struct kvec *iov_p;
e48354ce
NB		 1401 struct msghdr msg;
1402
1403 if (!conn || !conn->sock || !conn->conn_ops)
1404 return -1;
1405
1406 memset(&msg, 0, sizeof(struct msghdr));
1407
2ff017f5
NB		 1408 iov_p = count->iov;
1409 iov_len = count->iov_count;
e48354ce
NB		 1410
1411 while (total_rx < data) {
1412 rx_loop = kernel_recvmsg(conn->sock, &msg, iov_p, iov_len,
1413 (data - total_rx), MSG_WAITALL);
1414 if (rx_loop <= 0) {
1415 pr_debug("rx_loop: %d total_rx: %d\n",
1416 rx_loop, total_rx);
1417 return rx_loop;
1418 }
1419 total_rx += rx_loop;
1420 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n",
1421 rx_loop, total_rx, data);
1422 }
1423
e48354ce
NB		 1424 return total_rx;
1425}
1426
1427static int iscsit_do_tx_data(
1428 struct iscsi_conn *conn,
1429 struct iscsi_data_count *count)
1430{
1431 int data = count->data_length, total_tx = 0, tx_loop = 0, iov_len;
2ff017f5 1432 struct kvec *iov_p;
e48354ce
NB		 1433 struct msghdr msg;
1434
1435 if (!conn || !conn->sock || !conn->conn_ops)
1436 return -1;
1437
1438 if (data <= 0) {
1439 pr_err("Data length is: %d\n", data);
1440 return -1;
1441 }
1442
1443 memset(&msg, 0, sizeof(struct msghdr));
1444
2ff017f5
NB		 1445 iov_p = count->iov;
1446 iov_len = count->iov_count;
e48354ce
NB		 1447
1448 while (total_tx < data) {
1449 tx_loop = kernel_sendmsg(conn->sock, &msg, iov_p, iov_len,
1450 (data - total_tx));
1451 if (tx_loop <= 0) {
1452 pr_debug("tx_loop: %d total_tx %d\n",
1453 tx_loop, total_tx);
1454 return tx_loop;
1455 }
1456 total_tx += tx_loop;
1457 pr_debug("tx_loop: %d, total_tx: %d, data: %d\n",
1458 tx_loop, total_tx, data);
1459 }
1460
e48354ce
NB		 1461 return total_tx;
1462}
1463
1464int rx_data(
1465 struct iscsi_conn *conn,
1466 struct kvec *iov,
1467 int iov_count,
1468 int data)
1469{
1470 struct iscsi_data_count c;
1471
1472 if (!conn || !conn->sock || !conn->conn_ops)
1473 return -1;
1474
1475 memset(&c, 0, sizeof(struct iscsi_data_count));
1476 c.iov = iov;
1477 c.iov_count = iov_count;
1478 c.data_length = data;
1479 c.type = ISCSI_RX_DATA;
1480
e48354ce
NB		 1481 return iscsit_do_rx_data(conn, &c);
1482}
1483
1484int tx_data(
1485 struct iscsi_conn *conn,
1486 struct kvec *iov,
1487 int iov_count,
1488 int data)
1489{
1490 struct iscsi_data_count c;
1491
1492 if (!conn || !conn->sock || !conn->conn_ops)
1493 return -1;
1494
1495 memset(&c, 0, sizeof(struct iscsi_data_count));
1496 c.iov = iov;
1497 c.iov_count = iov_count;
1498 c.data_length = data;
1499 c.type = ISCSI_TX_DATA;
1500
e48354ce
NB		 1501 return iscsit_do_tx_data(conn, &c);
1502}
1503
1504void iscsit_collect_login_stats(
1505 struct iscsi_conn *conn,
1506 u8 status_class,
1507 u8 status_detail)
1508{
1509 struct iscsi_param *intrname = NULL;
1510 struct iscsi_tiqn *tiqn;
1511 struct iscsi_login_stats *ls;
1512
1513 tiqn = iscsit_snmp_get_tiqn(conn);
1514 if (!tiqn)
1515 return;
1516
1517 ls = &tiqn->login_stats;
1518
1519 spin_lock(&ls->lock);
1520 if (!strcmp(conn->login_ip, ls->last_intr_fail_ip_addr) &&
1521 ((get_jiffies_64() - ls->last_fail_time) < 10)) {
1522 /* We already have the failure info for this login */
1523 spin_unlock(&ls->lock);
1524 return;
1525 }
1526
1527 if (status_class == ISCSI_STATUS_CLS_SUCCESS)
1528 ls->accepts++;
1529 else if (status_class == ISCSI_STATUS_CLS_REDIRECT) {
1530 ls->redirects++;
1531 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT;
1532 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1533 (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) {
1534 ls->authenticate_fails++;
1535 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE;
1536 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1537 (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) {
1538 ls->authorize_fails++;
1539 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE;
1540 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1541 (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) {
1542 ls->negotiate_fails++;
1543 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE;
1544 } else {
1545 ls->other_fails++;
1546 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER;
1547 }
1548
1549 /* Save initiator name, ip address and time, if it is a failed login */
1550 if (status_class != ISCSI_STATUS_CLS_SUCCESS) {
1551 if (conn->param_list)
1552 intrname = iscsi_find_param_from_key(INITIATORNAME,
1553 conn->param_list);
1554 strcpy(ls->last_intr_fail_name,
1555 (intrname ? intrname->value : "Unknown"));
1556
1557 ls->last_intr_fail_ip_family = conn->sock->sk->sk_family;
1558 snprintf(ls->last_intr_fail_ip_addr, IPV6_ADDRESS_SPACE,
1559 "%s", conn->login_ip);
1560 ls->last_fail_time = get_jiffies_64();
1561 }
1562
1563 spin_unlock(&ls->lock);
1564}
1565
1566struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn)
1567{
1568 struct iscsi_portal_group *tpg;
1569
1570 if (!conn || !conn->sess)
1571 return NULL;
1572
1573 tpg = conn->sess->tpg;
1574 if (!tpg)
1575 return NULL;
1576
1577 if (!tpg->tpg_tiqn)
1578 return NULL;
1579
1580 return tpg->tpg_tiqn;
1581}
kernel source for telekom puls (alcatel/mediatek)