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target: Remove transport_do_task_sg_chain() and associated detritus
[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
NB		 26#include <target/target_core_configfs.h>
27
28#include "iscsi_target_core.h"
29#include "iscsi_target_parameters.h"
30#include "iscsi_target_seq_pdu_list.h"
31#include "iscsi_target_datain_values.h"
32#include "iscsi_target_erl0.h"
33#include "iscsi_target_erl1.h"
34#include "iscsi_target_erl2.h"
35#include "iscsi_target_tpg.h"
36#include "iscsi_target_tq.h"
37#include "iscsi_target_util.h"
38#include "iscsi_target.h"
39
40#define PRINT_BUFF(buff, len) \
41{ \
42 int zzz; \
43 \
44 pr_debug("%d:\n", __LINE__); \
45 for (zzz = 0; zzz < len; zzz++) { \
46 if (zzz % 16 == 0) { \
47 if (zzz) \
48 pr_debug("\n"); \
49 pr_debug("%4i: ", zzz); \
50 } \
51 pr_debug("%02x ", (unsigned char) (buff)[zzz]); \
52 } \
53 if ((len + 1) % 16) \
54 pr_debug("\n"); \
55}
56
57extern struct list_head g_tiqn_list;
58extern spinlock_t tiqn_lock;
59
60/*
61 * Called with cmd->r2t_lock held.
62 */
63int iscsit_add_r2t_to_list(
64 struct iscsi_cmd *cmd,
65 u32 offset,
66 u32 xfer_len,
67 int recovery,
68 u32 r2t_sn)
69{
70 struct iscsi_r2t *r2t;
71
72 r2t = kmem_cache_zalloc(lio_r2t_cache, GFP_ATOMIC);
73 if (!r2t) {
74 pr_err("Unable to allocate memory for struct iscsi_r2t.\n");
75 return -1;
76 }
77 INIT_LIST_HEAD(&r2t->r2t_list);
78
79 r2t->recovery_r2t = recovery;
80 r2t->r2t_sn = (!r2t_sn) ? cmd->r2t_sn++ : r2t_sn;
81 r2t->offset = offset;
82 r2t->xfer_len = xfer_len;
83 list_add_tail(&r2t->r2t_list, &cmd->cmd_r2t_list);
84 spin_unlock_bh(&cmd->r2t_lock);
85
86 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, ISTATE_SEND_R2T);
87
88 spin_lock_bh(&cmd->r2t_lock);
89 return 0;
90}
91
92struct iscsi_r2t *iscsit_get_r2t_for_eos(
93 struct iscsi_cmd *cmd,
94 u32 offset,
95 u32 length)
96{
97 struct iscsi_r2t *r2t;
98
99 spin_lock_bh(&cmd->r2t_lock);
100 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
101 if ((r2t->offset <= offset) &&
102 (r2t->offset + r2t->xfer_len) >= (offset + length)) {
103 spin_unlock_bh(&cmd->r2t_lock);
104 return r2t;
105 }
106 }
107 spin_unlock_bh(&cmd->r2t_lock);
108
109 pr_err("Unable to locate R2T for Offset: %u, Length:"
110 " %u\n", offset, length);
111 return NULL;
112}
113
114struct iscsi_r2t *iscsit_get_r2t_from_list(struct iscsi_cmd *cmd)
115{
116 struct iscsi_r2t *r2t;
117
118 spin_lock_bh(&cmd->r2t_lock);
119 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
120 if (!r2t->sent_r2t) {
121 spin_unlock_bh(&cmd->r2t_lock);
122 return r2t;
123 }
124 }
125 spin_unlock_bh(&cmd->r2t_lock);
126
127 pr_err("Unable to locate next R2T to send for ITT:"
128 " 0x%08x.\n", cmd->init_task_tag);
129 return NULL;
130}
131
132/*
133 * Called with cmd->r2t_lock held.
134 */
135void iscsit_free_r2t(struct iscsi_r2t *r2t, struct iscsi_cmd *cmd)
136{
137 list_del(&r2t->r2t_list);
138 kmem_cache_free(lio_r2t_cache, r2t);
139}
140
141void iscsit_free_r2ts_from_list(struct iscsi_cmd *cmd)
142{
143 struct iscsi_r2t *r2t, *r2t_tmp;
144
145 spin_lock_bh(&cmd->r2t_lock);
146 list_for_each_entry_safe(r2t, r2t_tmp, &cmd->cmd_r2t_list, r2t_list)
147 iscsit_free_r2t(r2t, cmd);
148 spin_unlock_bh(&cmd->r2t_lock);
149}
150
151/*
152 * May be called from software interrupt (timer) context for allocating
153 * iSCSI NopINs.
154 */
155struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *conn, gfp_t gfp_mask)
156{
157 struct iscsi_cmd *cmd;
158
159 cmd = kmem_cache_zalloc(lio_cmd_cache, gfp_mask);
160 if (!cmd) {
161 pr_err("Unable to allocate memory for struct iscsi_cmd.\n");
162 return NULL;
163 }
164
165 cmd->conn = conn;
166 INIT_LIST_HEAD(&cmd->i_list);
167 INIT_LIST_HEAD(&cmd->datain_list);
168 INIT_LIST_HEAD(&cmd->cmd_r2t_list);
169 init_completion(&cmd->reject_comp);
170 spin_lock_init(&cmd->datain_lock);
171 spin_lock_init(&cmd->dataout_timeout_lock);
172 spin_lock_init(&cmd->istate_lock);
173 spin_lock_init(&cmd->error_lock);
174 spin_lock_init(&cmd->r2t_lock);
175
176 return cmd;
177}
178
179/*
180 * Called from iscsi_handle_scsi_cmd()
181 */
182struct iscsi_cmd *iscsit_allocate_se_cmd(
183 struct iscsi_conn *conn,
184 u32 data_length,
185 int data_direction,
186 int iscsi_task_attr)
187{
188 struct iscsi_cmd *cmd;
189 struct se_cmd *se_cmd;
190 int sam_task_attr;
191
192 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
193 if (!cmd)
194 return NULL;
195
196 cmd->data_direction = data_direction;
197 cmd->data_length = data_length;
198 /*
199 * Figure out the SAM Task Attribute for the incoming SCSI CDB
200 */
201 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
202 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
203 sam_task_attr = MSG_SIMPLE_TAG;
204 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
205 sam_task_attr = MSG_ORDERED_TAG;
206 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
207 sam_task_attr = MSG_HEAD_TAG;
208 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
209 sam_task_attr = MSG_ACA_TAG;
210 else {
211 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
212 " MSG_SIMPLE_TAG\n", iscsi_task_attr);
213 sam_task_attr = MSG_SIMPLE_TAG;
214 }
215
216 se_cmd = &cmd->se_cmd;
217 /*
218 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
219 */
220 transport_init_se_cmd(se_cmd, &lio_target_fabric_configfs->tf_ops,
221 conn->sess->se_sess, data_length, data_direction,
222 sam_task_attr, &cmd->sense_buffer[0]);
223 return cmd;
224}
225
226struct iscsi_cmd *iscsit_allocate_se_cmd_for_tmr(
227 struct iscsi_conn *conn,
228 u8 function)
229{
230 struct iscsi_cmd *cmd;
231 struct se_cmd *se_cmd;
c8e31f26 232 int rc;
e48354ce
NB		 233 u8 tcm_function;
234
235 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
236 if (!cmd)
237 return NULL;
238
239 cmd->data_direction = DMA_NONE;
240
241 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
242 if (!cmd->tmr_req) {
243 pr_err("Unable to allocate memory for"
244 " Task Management command!\n");
ba773669 245 goto out;
e48354ce
NB		 246 }
247 /*
248 * TASK_REASSIGN for ERL=2 / connection stays inside of
249 * LIO-Target $FABRIC_MOD
250 */
251 if (function == ISCSI_TM_FUNC_TASK_REASSIGN)
252 return cmd;
253
254 se_cmd = &cmd->se_cmd;
255 /*
256 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
257 */
258 transport_init_se_cmd(se_cmd, &lio_target_fabric_configfs->tf_ops,
259 conn->sess->se_sess, 0, DMA_NONE,
260 MSG_SIMPLE_TAG, &cmd->sense_buffer[0]);
261
262 switch (function) {
263 case ISCSI_TM_FUNC_ABORT_TASK:
264 tcm_function = TMR_ABORT_TASK;
265 break;
266 case ISCSI_TM_FUNC_ABORT_TASK_SET:
267 tcm_function = TMR_ABORT_TASK_SET;
268 break;
269 case ISCSI_TM_FUNC_CLEAR_ACA:
270 tcm_function = TMR_CLEAR_ACA;
271 break;
272 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
273 tcm_function = TMR_CLEAR_TASK_SET;
274 break;
275 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
276 tcm_function = TMR_LUN_RESET;
277 break;
278 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
279 tcm_function = TMR_TARGET_WARM_RESET;
280 break;
281 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
282 tcm_function = TMR_TARGET_COLD_RESET;
283 break;
284 default:
285 pr_err("Unknown iSCSI TMR Function:"
286 " 0x%02x\n", function);
287 goto out;
288 }
289
c8e31f26
AG		 290 rc = core_tmr_alloc_req(se_cmd, cmd->tmr_req, tcm_function, GFP_KERNEL);
291 if (rc < 0)
e48354ce
NB		 292 goto out;
293
294 cmd->tmr_req->se_tmr_req = se_cmd->se_tmr_req;
295
296 return cmd;
297out:
298 iscsit_release_cmd(cmd);
e48354ce
NB		 299 return NULL;
300}
301
302int iscsit_decide_list_to_build(
303 struct iscsi_cmd *cmd,
304 u32 immediate_data_length)
305{
306 struct iscsi_build_list bl;
307 struct iscsi_conn *conn = cmd->conn;
308 struct iscsi_session *sess = conn->sess;
309 struct iscsi_node_attrib *na;
310
311 if (sess->sess_ops->DataSequenceInOrder &&
312 sess->sess_ops->DataPDUInOrder)
313 return 0;
314
315 if (cmd->data_direction == DMA_NONE)
316 return 0;
317
318 na = iscsit_tpg_get_node_attrib(sess);
319 memset(&bl, 0, sizeof(struct iscsi_build_list));
320
321 if (cmd->data_direction == DMA_FROM_DEVICE) {
322 bl.data_direction = ISCSI_PDU_READ;
323 bl.type = PDULIST_NORMAL;
324 if (na->random_datain_pdu_offsets)
325 bl.randomize |= RANDOM_DATAIN_PDU_OFFSETS;
326 if (na->random_datain_seq_offsets)
327 bl.randomize |= RANDOM_DATAIN_SEQ_OFFSETS;
328 } else {
329 bl.data_direction = ISCSI_PDU_WRITE;
330 bl.immediate_data_length = immediate_data_length;
331 if (na->random_r2t_offsets)
332 bl.randomize |= RANDOM_R2T_OFFSETS;
333
334 if (!cmd->immediate_data && !cmd->unsolicited_data)
335 bl.type = PDULIST_NORMAL;
336 else if (cmd->immediate_data && !cmd->unsolicited_data)
337 bl.type = PDULIST_IMMEDIATE;
338 else if (!cmd->immediate_data && cmd->unsolicited_data)
339 bl.type = PDULIST_UNSOLICITED;
340 else if (cmd->immediate_data && cmd->unsolicited_data)
341 bl.type = PDULIST_IMMEDIATE_AND_UNSOLICITED;
342 }
343
344 return iscsit_do_build_list(cmd, &bl);
345}
346
347struct iscsi_seq *iscsit_get_seq_holder_for_datain(
348 struct iscsi_cmd *cmd,
349 u32 seq_send_order)
350{
351 u32 i;
352
353 for (i = 0; i < cmd->seq_count; i++)
354 if (cmd->seq_list[i].seq_send_order == seq_send_order)
355 return &cmd->seq_list[i];
356
357 return NULL;
358}
359
360struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsi_cmd *cmd)
361{
362 u32 i;
363
364 if (!cmd->seq_list) {
365 pr_err("struct iscsi_cmd->seq_list is NULL!\n");
366 return NULL;
367 }
368
369 for (i = 0; i < cmd->seq_count; i++) {
370 if (cmd->seq_list[i].type != SEQTYPE_NORMAL)
371 continue;
372 if (cmd->seq_list[i].seq_send_order == cmd->seq_send_order) {
373 cmd->seq_send_order++;
374 return &cmd->seq_list[i];
375 }
376 }
377
378 return NULL;
379}
380
381struct iscsi_r2t *iscsit_get_holder_for_r2tsn(
382 struct iscsi_cmd *cmd,
383 u32 r2t_sn)
384{
385 struct iscsi_r2t *r2t;
386
387 spin_lock_bh(&cmd->r2t_lock);
388 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
389 if (r2t->r2t_sn == r2t_sn) {
390 spin_unlock_bh(&cmd->r2t_lock);
391 return r2t;
392 }
393 }
394 spin_unlock_bh(&cmd->r2t_lock);
395
396 return NULL;
397}
398
399static inline int iscsit_check_received_cmdsn(struct iscsi_session *sess, u32 cmdsn)
400{
401 int ret;
402
403 /*
404 * This is the proper method of checking received CmdSN against
405 * ExpCmdSN and MaxCmdSN values, as well as accounting for out
406 * or order CmdSNs due to multiple connection sessions and/or
407 * CRC failures.
408 */
409 if (iscsi_sna_gt(cmdsn, sess->max_cmd_sn)) {
410 pr_err("Received CmdSN: 0x%08x is greater than"
411 " MaxCmdSN: 0x%08x, protocol error.\n", cmdsn,
412 sess->max_cmd_sn);
413 ret = CMDSN_ERROR_CANNOT_RECOVER;
414
415 } else if (cmdsn == sess->exp_cmd_sn) {
416 sess->exp_cmd_sn++;
417 pr_debug("Received CmdSN matches ExpCmdSN,"
418 " incremented ExpCmdSN to: 0x%08x\n",
419 sess->exp_cmd_sn);
420 ret = CMDSN_NORMAL_OPERATION;
421
422 } else if (iscsi_sna_gt(cmdsn, sess->exp_cmd_sn)) {
423 pr_debug("Received CmdSN: 0x%08x is greater"
424 " than ExpCmdSN: 0x%08x, not acknowledging.\n",
425 cmdsn, sess->exp_cmd_sn);
426 ret = CMDSN_HIGHER_THAN_EXP;
427
428 } else {
429 pr_err("Received CmdSN: 0x%08x is less than"
430 " ExpCmdSN: 0x%08x, ignoring.\n", cmdsn,
431 sess->exp_cmd_sn);
432 ret = CMDSN_LOWER_THAN_EXP;
433 }
434
435 return ret;
436}
437
438/*
439 * Commands may be received out of order if MC/S is in use.
440 * Ensure they are executed in CmdSN order.
441 */
442int iscsit_sequence_cmd(
443 struct iscsi_conn *conn,
444 struct iscsi_cmd *cmd,
445 u32 cmdsn)
446{
447 int ret;
448 int cmdsn_ret;
449
450 mutex_lock(&conn->sess->cmdsn_mutex);
451
452 cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, cmdsn);
453 switch (cmdsn_ret) {
454 case CMDSN_NORMAL_OPERATION:
455 ret = iscsit_execute_cmd(cmd, 0);
456 if ((ret >= 0) && !list_empty(&conn->sess->sess_ooo_cmdsn_list))
457 iscsit_execute_ooo_cmdsns(conn->sess);
458 break;
459 case CMDSN_HIGHER_THAN_EXP:
460 ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, cmdsn);
461 break;
462 case CMDSN_LOWER_THAN_EXP:
463 cmd->i_state = ISTATE_REMOVE;
464 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
465 ret = cmdsn_ret;
466 break;
467 default:
468 ret = cmdsn_ret;
469 break;
470 }
471 mutex_unlock(&conn->sess->cmdsn_mutex);
472
473 return ret;
474}
475
476int iscsit_check_unsolicited_dataout(struct iscsi_cmd *cmd, unsigned char *buf)
477{
478 struct iscsi_conn *conn = cmd->conn;
479 struct se_cmd *se_cmd = &cmd->se_cmd;
480 struct iscsi_data *hdr = (struct iscsi_data *) buf;
481 u32 payload_length = ntoh24(hdr->dlength);
482
483 if (conn->sess->sess_ops->InitialR2T) {
484 pr_err("Received unexpected unsolicited data"
485 " while InitialR2T=Yes, protocol error.\n");
486 transport_send_check_condition_and_sense(se_cmd,
487 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
488 return -1;
489 }
490
491 if ((cmd->first_burst_len + payload_length) >
492 conn->sess->sess_ops->FirstBurstLength) {
493 pr_err("Total %u bytes exceeds FirstBurstLength: %u"
494 " for this Unsolicited DataOut Burst.\n",
495 (cmd->first_burst_len + payload_length),
496 conn->sess->sess_ops->FirstBurstLength);
497 transport_send_check_condition_and_sense(se_cmd,
498 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
499 return -1;
500 }
501
502 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))
503 return 0;
504
505 if (((cmd->first_burst_len + payload_length) != cmd->data_length) &&
506 ((cmd->first_burst_len + payload_length) !=
507 conn->sess->sess_ops->FirstBurstLength)) {
508 pr_err("Unsolicited non-immediate data received %u"
509 " does not equal FirstBurstLength: %u, and does"
510 " not equal ExpXferLen %u.\n",
511 (cmd->first_burst_len + payload_length),
512 conn->sess->sess_ops->FirstBurstLength, cmd->data_length);
513 transport_send_check_condition_and_sense(se_cmd,
514 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
515 return -1;
516 }
517 return 0;
518}
519
520struct iscsi_cmd *iscsit_find_cmd_from_itt(
521 struct iscsi_conn *conn,
522 u32 init_task_tag)
523{
524 struct iscsi_cmd *cmd;
525
526 spin_lock_bh(&conn->cmd_lock);
527 list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
528 if (cmd->init_task_tag == init_task_tag) {
529 spin_unlock_bh(&conn->cmd_lock);
530 return cmd;
531 }
532 }
533 spin_unlock_bh(&conn->cmd_lock);
534
535 pr_err("Unable to locate ITT: 0x%08x on CID: %hu",
536 init_task_tag, conn->cid);
537 return NULL;
538}
539
540struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump(
541 struct iscsi_conn *conn,
542 u32 init_task_tag,
543 u32 length)
544{
545 struct iscsi_cmd *cmd;
546
547 spin_lock_bh(&conn->cmd_lock);
548 list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
549 if (cmd->init_task_tag == init_task_tag) {
550 spin_unlock_bh(&conn->cmd_lock);
551 return cmd;
552 }
553 }
554 spin_unlock_bh(&conn->cmd_lock);
555
556 pr_err("Unable to locate ITT: 0x%08x on CID: %hu,"
557 " dumping payload\n", init_task_tag, conn->cid);
558 if (length)
559 iscsit_dump_data_payload(conn, length, 1);
560
561 return NULL;
562}
563
564struct iscsi_cmd *iscsit_find_cmd_from_ttt(
565 struct iscsi_conn *conn,
566 u32 targ_xfer_tag)
567{
568 struct iscsi_cmd *cmd = NULL;
569
570 spin_lock_bh(&conn->cmd_lock);
571 list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
572 if (cmd->targ_xfer_tag == targ_xfer_tag) {
573 spin_unlock_bh(&conn->cmd_lock);
574 return cmd;
575 }
576 }
577 spin_unlock_bh(&conn->cmd_lock);
578
579 pr_err("Unable to locate TTT: 0x%08x on CID: %hu\n",
580 targ_xfer_tag, conn->cid);
581 return NULL;
582}
583
584int iscsit_find_cmd_for_recovery(
585 struct iscsi_session *sess,
586 struct iscsi_cmd **cmd_ptr,
587 struct iscsi_conn_recovery **cr_ptr,
588 u32 init_task_tag)
589{
590 struct iscsi_cmd *cmd = NULL;
591 struct iscsi_conn_recovery *cr;
592 /*
593 * Scan through the inactive connection recovery list's command list.
594 * If init_task_tag matches the command is still alligent.
595 */
596 spin_lock(&sess->cr_i_lock);
597 list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) {
598 spin_lock(&cr->conn_recovery_cmd_lock);
599 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_list) {
600 if (cmd->init_task_tag == init_task_tag) {
601 spin_unlock(&cr->conn_recovery_cmd_lock);
602 spin_unlock(&sess->cr_i_lock);
603
604 *cr_ptr = cr;
605 *cmd_ptr = cmd;
606 return -2;
607 }
608 }
609 spin_unlock(&cr->conn_recovery_cmd_lock);
610 }
611 spin_unlock(&sess->cr_i_lock);
612 /*
613 * Scan through the active connection recovery list's command list.
614 * If init_task_tag matches the command is ready to be reassigned.
615 */
616 spin_lock(&sess->cr_a_lock);
617 list_for_each_entry(cr, &sess->cr_active_list, cr_list) {
618 spin_lock(&cr->conn_recovery_cmd_lock);
619 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_list) {
620 if (cmd->init_task_tag == init_task_tag) {
621 spin_unlock(&cr->conn_recovery_cmd_lock);
622 spin_unlock(&sess->cr_a_lock);
623
624 *cr_ptr = cr;
625 *cmd_ptr = cmd;
626 return 0;
627 }
628 }
629 spin_unlock(&cr->conn_recovery_cmd_lock);
630 }
631 spin_unlock(&sess->cr_a_lock);
632
633 return -1;
634}
635
636void iscsit_add_cmd_to_immediate_queue(
637 struct iscsi_cmd *cmd,
638 struct iscsi_conn *conn,
639 u8 state)
640{
641 struct iscsi_queue_req *qr;
642
643 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
644 if (!qr) {
645 pr_err("Unable to allocate memory for"
646 " struct iscsi_queue_req\n");
647 return;
648 }
649 INIT_LIST_HEAD(&qr->qr_list);
650 qr->cmd = cmd;
651 qr->state = state;
652
653 spin_lock_bh(&conn->immed_queue_lock);
654 list_add_tail(&qr->qr_list, &conn->immed_queue_list);
655 atomic_inc(&cmd->immed_queue_count);
656 atomic_set(&conn->check_immediate_queue, 1);
657 spin_unlock_bh(&conn->immed_queue_lock);
658
659 wake_up_process(conn->thread_set->tx_thread);
660}
661
662struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *conn)
663{
664 struct iscsi_queue_req *qr;
665
666 spin_lock_bh(&conn->immed_queue_lock);
667 if (list_empty(&conn->immed_queue_list)) {
668 spin_unlock_bh(&conn->immed_queue_lock);
669 return NULL;
670 }
671 list_for_each_entry(qr, &conn->immed_queue_list, qr_list)
672 break;
673
674 list_del(&qr->qr_list);
675 if (qr->cmd)
676 atomic_dec(&qr->cmd->immed_queue_count);
677 spin_unlock_bh(&conn->immed_queue_lock);
678
679 return qr;
680}
681
682static void iscsit_remove_cmd_from_immediate_queue(
683 struct iscsi_cmd *cmd,
684 struct iscsi_conn *conn)
685{
686 struct iscsi_queue_req *qr, *qr_tmp;
687
688 spin_lock_bh(&conn->immed_queue_lock);
689 if (!atomic_read(&cmd->immed_queue_count)) {
690 spin_unlock_bh(&conn->immed_queue_lock);
691 return;
692 }
693
694 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
695 if (qr->cmd != cmd)
696 continue;
697
698 atomic_dec(&qr->cmd->immed_queue_count);
699 list_del(&qr->qr_list);
700 kmem_cache_free(lio_qr_cache, qr);
701 }
702 spin_unlock_bh(&conn->immed_queue_lock);
703
704 if (atomic_read(&cmd->immed_queue_count)) {
705 pr_err("ITT: 0x%08x immed_queue_count: %d\n",
706 cmd->init_task_tag,
707 atomic_read(&cmd->immed_queue_count));
708 }
709}
710
711void iscsit_add_cmd_to_response_queue(
712 struct iscsi_cmd *cmd,
713 struct iscsi_conn *conn,
714 u8 state)
715{
716 struct iscsi_queue_req *qr;
717
718 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
719 if (!qr) {
720 pr_err("Unable to allocate memory for"
721 " struct iscsi_queue_req\n");
722 return;
723 }
724 INIT_LIST_HEAD(&qr->qr_list);
725 qr->cmd = cmd;
726 qr->state = state;
727
728 spin_lock_bh(&conn->response_queue_lock);
729 list_add_tail(&qr->qr_list, &conn->response_queue_list);
730 atomic_inc(&cmd->response_queue_count);
731 spin_unlock_bh(&conn->response_queue_lock);
732
733 wake_up_process(conn->thread_set->tx_thread);
734}
735
736struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *conn)
737{
738 struct iscsi_queue_req *qr;
739
740 spin_lock_bh(&conn->response_queue_lock);
741 if (list_empty(&conn->response_queue_list)) {
742 spin_unlock_bh(&conn->response_queue_lock);
743 return NULL;
744 }
745
746 list_for_each_entry(qr, &conn->response_queue_list, qr_list)
747 break;
748
749 list_del(&qr->qr_list);
750 if (qr->cmd)
751 atomic_dec(&qr->cmd->response_queue_count);
752 spin_unlock_bh(&conn->response_queue_lock);
753
754 return qr;
755}
756
757static void iscsit_remove_cmd_from_response_queue(
758 struct iscsi_cmd *cmd,
759 struct iscsi_conn *conn)
760{
761 struct iscsi_queue_req *qr, *qr_tmp;
762
763 spin_lock_bh(&conn->response_queue_lock);
764 if (!atomic_read(&cmd->response_queue_count)) {
765 spin_unlock_bh(&conn->response_queue_lock);
766 return;
767 }
768
769 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
770 qr_list) {
771 if (qr->cmd != cmd)
772 continue;
773
774 atomic_dec(&qr->cmd->response_queue_count);
775 list_del(&qr->qr_list);
776 kmem_cache_free(lio_qr_cache, qr);
777 }
778 spin_unlock_bh(&conn->response_queue_lock);
779
780 if (atomic_read(&cmd->response_queue_count)) {
781 pr_err("ITT: 0x%08x response_queue_count: %d\n",
782 cmd->init_task_tag,
783 atomic_read(&cmd->response_queue_count));
784 }
785}
786
787void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn)
788{
789 struct iscsi_queue_req *qr, *qr_tmp;
790
791 spin_lock_bh(&conn->immed_queue_lock);
792 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
793 list_del(&qr->qr_list);
794 if (qr->cmd)
795 atomic_dec(&qr->cmd->immed_queue_count);
796
797 kmem_cache_free(lio_qr_cache, qr);
798 }
799 spin_unlock_bh(&conn->immed_queue_lock);
800
801 spin_lock_bh(&conn->response_queue_lock);
802 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
803 qr_list) {
804 list_del(&qr->qr_list);
805 if (qr->cmd)
806 atomic_dec(&qr->cmd->response_queue_count);
807
808 kmem_cache_free(lio_qr_cache, qr);
809 }
810 spin_unlock_bh(&conn->response_queue_lock);
811}
812
813void iscsit_release_cmd(struct iscsi_cmd *cmd)
814{
815 struct iscsi_conn *conn = cmd->conn;
816 int i;
817
818 iscsit_free_r2ts_from_list(cmd);
819 iscsit_free_all_datain_reqs(cmd);
820
821 kfree(cmd->buf_ptr);
822 kfree(cmd->pdu_list);
823 kfree(cmd->seq_list);
824 kfree(cmd->tmr_req);
825 kfree(cmd->iov_data);
826
827 for (i = 0; i < cmd->t_mem_sg_nents; i++)
828 __free_page(sg_page(&cmd->t_mem_sg[i]));
829
830 kfree(cmd->t_mem_sg);
831
832 if (conn) {
833 iscsit_remove_cmd_from_immediate_queue(cmd, conn);
834 iscsit_remove_cmd_from_response_queue(cmd, conn);
835 }
836
837 kmem_cache_free(lio_cmd_cache, cmd);
838}
839
d270190a
NB		 840void iscsit_free_cmd(struct iscsi_cmd *cmd)
841{
842 /*
843 * Determine if a struct se_cmd is assoicated with
844 * this struct iscsi_cmd.
845 */
846 switch (cmd->iscsi_opcode) {
847 case ISCSI_OP_SCSI_CMD:
848 case ISCSI_OP_SCSI_TMFUNC:
849 transport_generic_free_cmd(&cmd->se_cmd, 1);
850 break;
c1ce4bd5
NB		 851 case ISCSI_OP_REJECT:
852 /*
853 * Handle special case for REJECT when iscsi_add_reject*() has
854 * overwritten the original iscsi_opcode assignment, and the
855 * associated cmd->se_cmd needs to be released.
856 */
857 if (cmd->se_cmd.se_tfo != NULL) {
858 transport_generic_free_cmd(&cmd->se_cmd, 1);
859 break;
860 }
861 /* Fall-through */
d270190a
NB		 862 default:
863 iscsit_release_cmd(cmd);
864 break;
865 }
866}
867
e48354ce
NB		 868int iscsit_check_session_usage_count(struct iscsi_session *sess)
869{
870 spin_lock_bh(&sess->session_usage_lock);
871 if (sess->session_usage_count != 0) {
872 sess->session_waiting_on_uc = 1;
873 spin_unlock_bh(&sess->session_usage_lock);
874 if (in_interrupt())
875 return 2;
876
877 wait_for_completion(&sess->session_waiting_on_uc_comp);
878 return 1;
879 }
880 spin_unlock_bh(&sess->session_usage_lock);
881
882 return 0;
883}
884
885void iscsit_dec_session_usage_count(struct iscsi_session *sess)
886{
887 spin_lock_bh(&sess->session_usage_lock);
888 sess->session_usage_count--;
889
890 if (!sess->session_usage_count && sess->session_waiting_on_uc)
891 complete(&sess->session_waiting_on_uc_comp);
892
893 spin_unlock_bh(&sess->session_usage_lock);
894}
895
896void iscsit_inc_session_usage_count(struct iscsi_session *sess)
897{
898 spin_lock_bh(&sess->session_usage_lock);
899 sess->session_usage_count++;
900 spin_unlock_bh(&sess->session_usage_lock);
901}
902
e48354ce
NB		 903/*
904 * Setup conn->if_marker and conn->of_marker values based upon
905 * the initial marker-less interval. (see iSCSI v19 A.2)
906 */
907int iscsit_set_sync_and_steering_values(struct iscsi_conn *conn)
908{
909 int login_ifmarker_count = 0, login_ofmarker_count = 0, next_marker = 0;
910 /*
911 * IFMarkInt and OFMarkInt are negotiated as 32-bit words.
912 */
913 u32 IFMarkInt = (conn->conn_ops->IFMarkInt * 4);
914 u32 OFMarkInt = (conn->conn_ops->OFMarkInt * 4);
915
916 if (conn->conn_ops->OFMarker) {
917 /*
918 * Account for the first Login Command received not
919 * via iscsi_recv_msg().
920 */
921 conn->of_marker += ISCSI_HDR_LEN;
922 if (conn->of_marker <= OFMarkInt) {
923 conn->of_marker = (OFMarkInt - conn->of_marker);
924 } else {
925 login_ofmarker_count = (conn->of_marker / OFMarkInt);
926 next_marker = (OFMarkInt * (login_ofmarker_count + 1)) +
927 (login_ofmarker_count * MARKER_SIZE);
928 conn->of_marker = (next_marker - conn->of_marker);
929 }
930 conn->of_marker_offset = 0;
931 pr_debug("Setting OFMarker value to %u based on Initial"
932 " Markerless Interval.\n", conn->of_marker);
933 }
934
935 if (conn->conn_ops->IFMarker) {
936 if (conn->if_marker <= IFMarkInt) {
937 conn->if_marker = (IFMarkInt - conn->if_marker);
938 } else {
939 login_ifmarker_count = (conn->if_marker / IFMarkInt);
940 next_marker = (IFMarkInt * (login_ifmarker_count + 1)) +
941 (login_ifmarker_count * MARKER_SIZE);
942 conn->if_marker = (next_marker - conn->if_marker);
943 }
944 pr_debug("Setting IFMarker value to %u based on Initial"
945 " Markerless Interval.\n", conn->if_marker);
946 }
947
948 return 0;
949}
950
951struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid)
952{
953 struct iscsi_conn *conn;
954
955 spin_lock_bh(&sess->conn_lock);
956 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
957 if ((conn->cid == cid) &&
958 (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) {
959 iscsit_inc_conn_usage_count(conn);
960 spin_unlock_bh(&sess->conn_lock);
961 return conn;
962 }
963 }
964 spin_unlock_bh(&sess->conn_lock);
965
966 return NULL;
967}
968
969struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid)
970{
971 struct iscsi_conn *conn;
972
973 spin_lock_bh(&sess->conn_lock);
974 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
975 if (conn->cid == cid) {
976 iscsit_inc_conn_usage_count(conn);
977 spin_lock(&conn->state_lock);
978 atomic_set(&conn->connection_wait_rcfr, 1);
979 spin_unlock(&conn->state_lock);
980 spin_unlock_bh(&sess->conn_lock);
981 return conn;
982 }
983 }
984 spin_unlock_bh(&sess->conn_lock);
985
986 return NULL;
987}
988
989void iscsit_check_conn_usage_count(struct iscsi_conn *conn)
990{
991 spin_lock_bh(&conn->conn_usage_lock);
992 if (conn->conn_usage_count != 0) {
993 conn->conn_waiting_on_uc = 1;
994 spin_unlock_bh(&conn->conn_usage_lock);
995
996 wait_for_completion(&conn->conn_waiting_on_uc_comp);
997 return;
998 }
999 spin_unlock_bh(&conn->conn_usage_lock);
1000}
1001
1002void iscsit_dec_conn_usage_count(struct iscsi_conn *conn)
1003{
1004 spin_lock_bh(&conn->conn_usage_lock);
1005 conn->conn_usage_count--;
1006
1007 if (!conn->conn_usage_count && conn->conn_waiting_on_uc)
1008 complete(&conn->conn_waiting_on_uc_comp);
1009
1010 spin_unlock_bh(&conn->conn_usage_lock);
1011}
1012
1013void iscsit_inc_conn_usage_count(struct iscsi_conn *conn)
1014{
1015 spin_lock_bh(&conn->conn_usage_lock);
1016 conn->conn_usage_count++;
1017 spin_unlock_bh(&conn->conn_usage_lock);
1018}
1019
1020static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response)
1021{
1022 u8 state;
1023 struct iscsi_cmd *cmd;
1024
1025 cmd = iscsit_allocate_cmd(conn, GFP_ATOMIC);
1026 if (!cmd)
1027 return -1;
1028
1029 cmd->iscsi_opcode = ISCSI_OP_NOOP_IN;
1030 state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE :
1031 ISTATE_SEND_NOPIN_NO_RESPONSE;
1032 cmd->init_task_tag = 0xFFFFFFFF;
1033 spin_lock_bh(&conn->sess->ttt_lock);
1034 cmd->targ_xfer_tag = (want_response) ? conn->sess->targ_xfer_tag++ :
1035 0xFFFFFFFF;
1036 if (want_response && (cmd->targ_xfer_tag == 0xFFFFFFFF))
1037 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
1038 spin_unlock_bh(&conn->sess->ttt_lock);
1039
1040 spin_lock_bh(&conn->cmd_lock);
1041 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1042 spin_unlock_bh(&conn->cmd_lock);
1043
1044 if (want_response)
1045 iscsit_start_nopin_response_timer(conn);
1046 iscsit_add_cmd_to_immediate_queue(cmd, conn, state);
1047
1048 return 0;
1049}
1050
1051static void iscsit_handle_nopin_response_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_response_timer_flags & ISCSI_TF_STOP) {
1059 spin_unlock_bh(&conn->nopin_timer_lock);
1060 iscsit_dec_conn_usage_count(conn);
1061 return;
1062 }
1063
1064 pr_debug("Did not receive response to NOPIN on CID: %hu on"
1065 " SID: %u, failing connection.\n", conn->cid,
1066 conn->sess->sid);
1067 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
1068 spin_unlock_bh(&conn->nopin_timer_lock);
1069
1070 {
1071 struct iscsi_portal_group *tpg = conn->sess->tpg;
1072 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
1073
1074 if (tiqn) {
1075 spin_lock_bh(&tiqn->sess_err_stats.lock);
1076 strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
8359cf43 1077 conn->sess->sess_ops->InitiatorName);
e48354ce
NB		 1078 tiqn->sess_err_stats.last_sess_failure_type =
1079 ISCSI_SESS_ERR_CXN_TIMEOUT;
1080 tiqn->sess_err_stats.cxn_timeout_errors++;
1081 conn->sess->conn_timeout_errors++;
1082 spin_unlock_bh(&tiqn->sess_err_stats.lock);
1083 }
1084 }
1085
1086 iscsit_cause_connection_reinstatement(conn, 0);
1087 iscsit_dec_conn_usage_count(conn);
1088}
1089
1090void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn)
1091{
1092 struct iscsi_session *sess = conn->sess;
1093 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1094
1095 spin_lock_bh(&conn->nopin_timer_lock);
1096 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
1097 spin_unlock_bh(&conn->nopin_timer_lock);
1098 return;
1099 }
1100
1101 mod_timer(&conn->nopin_response_timer,
1102 (get_jiffies_64() + na->nopin_response_timeout * HZ));
1103 spin_unlock_bh(&conn->nopin_timer_lock);
1104}
1105
1106/*
1107 * Called with conn->nopin_timer_lock held.
1108 */
1109void iscsit_start_nopin_response_timer(struct iscsi_conn *conn)
1110{
1111 struct iscsi_session *sess = conn->sess;
1112 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1113
1114 spin_lock_bh(&conn->nopin_timer_lock);
1115 if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) {
1116 spin_unlock_bh(&conn->nopin_timer_lock);
1117 return;
1118 }
1119
1120 init_timer(&conn->nopin_response_timer);
1121 conn->nopin_response_timer.expires =
1122 (get_jiffies_64() + na->nopin_response_timeout * HZ);
1123 conn->nopin_response_timer.data = (unsigned long)conn;
1124 conn->nopin_response_timer.function = iscsit_handle_nopin_response_timeout;
1125 conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP;
1126 conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING;
1127 add_timer(&conn->nopin_response_timer);
1128
1129 pr_debug("Started NOPIN Response Timer on CID: %d to %u"
1130 " seconds\n", conn->cid, na->nopin_response_timeout);
1131 spin_unlock_bh(&conn->nopin_timer_lock);
1132}
1133
1134void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn)
1135{
1136 spin_lock_bh(&conn->nopin_timer_lock);
1137 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
1138 spin_unlock_bh(&conn->nopin_timer_lock);
1139 return;
1140 }
1141 conn->nopin_response_timer_flags |= ISCSI_TF_STOP;
1142 spin_unlock_bh(&conn->nopin_timer_lock);
1143
1144 del_timer_sync(&conn->nopin_response_timer);
1145
1146 spin_lock_bh(&conn->nopin_timer_lock);
1147 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
1148 spin_unlock_bh(&conn->nopin_timer_lock);
1149}
1150
1151static void iscsit_handle_nopin_timeout(unsigned long data)
1152{
1153 struct iscsi_conn *conn = (struct iscsi_conn *) data;
1154
1155 iscsit_inc_conn_usage_count(conn);
1156
1157 spin_lock_bh(&conn->nopin_timer_lock);
1158 if (conn->nopin_timer_flags & ISCSI_TF_STOP) {
1159 spin_unlock_bh(&conn->nopin_timer_lock);
1160 iscsit_dec_conn_usage_count(conn);
1161 return;
1162 }
1163 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1164 spin_unlock_bh(&conn->nopin_timer_lock);
1165
1166 iscsit_add_nopin(conn, 1);
1167 iscsit_dec_conn_usage_count(conn);
1168}
1169
1170/*
1171 * Called with conn->nopin_timer_lock held.
1172 */
1173void __iscsit_start_nopin_timer(struct iscsi_conn *conn)
1174{
1175 struct iscsi_session *sess = conn->sess;
1176 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1177 /*
1178 * NOPIN timeout is disabled.
1179 */
1180 if (!na->nopin_timeout)
1181 return;
1182
1183 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING)
1184 return;
1185
1186 init_timer(&conn->nopin_timer);
1187 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1188 conn->nopin_timer.data = (unsigned long)conn;
1189 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1190 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1191 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1192 add_timer(&conn->nopin_timer);
1193
1194 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1195 " interval\n", conn->cid, na->nopin_timeout);
1196}
1197
1198void iscsit_start_nopin_timer(struct iscsi_conn *conn)
1199{
1200 struct iscsi_session *sess = conn->sess;
1201 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1202 /*
1203 * NOPIN timeout is disabled..
1204 */
1205 if (!na->nopin_timeout)
1206 return;
1207
1208 spin_lock_bh(&conn->nopin_timer_lock);
1209 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) {
1210 spin_unlock_bh(&conn->nopin_timer_lock);
1211 return;
1212 }
1213
1214 init_timer(&conn->nopin_timer);
1215 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1216 conn->nopin_timer.data = (unsigned long)conn;
1217 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1218 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1219 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1220 add_timer(&conn->nopin_timer);
1221
1222 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1223 " interval\n", conn->cid, na->nopin_timeout);
1224 spin_unlock_bh(&conn->nopin_timer_lock);
1225}
1226
1227void iscsit_stop_nopin_timer(struct iscsi_conn *conn)
1228{
1229 spin_lock_bh(&conn->nopin_timer_lock);
1230 if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) {
1231 spin_unlock_bh(&conn->nopin_timer_lock);
1232 return;
1233 }
1234 conn->nopin_timer_flags |= ISCSI_TF_STOP;
1235 spin_unlock_bh(&conn->nopin_timer_lock);
1236
1237 del_timer_sync(&conn->nopin_timer);
1238
1239 spin_lock_bh(&conn->nopin_timer_lock);
1240 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1241 spin_unlock_bh(&conn->nopin_timer_lock);
1242}
1243
1244int iscsit_send_tx_data(
1245 struct iscsi_cmd *cmd,
1246 struct iscsi_conn *conn,
1247 int use_misc)
1248{
1249 int tx_sent, tx_size;
1250 u32 iov_count;
1251 struct kvec *iov;
1252
1253send_data:
1254 tx_size = cmd->tx_size;
1255
1256 if (!use_misc) {
1257 iov = &cmd->iov_data[0];
1258 iov_count = cmd->iov_data_count;
1259 } else {
1260 iov = &cmd->iov_misc[0];
1261 iov_count = cmd->iov_misc_count;
1262 }
1263
1264 tx_sent = tx_data(conn, &iov[0], iov_count, tx_size);
1265 if (tx_size != tx_sent) {
1266 if (tx_sent == -EAGAIN) {
1267 pr_err("tx_data() returned -EAGAIN\n");
1268 goto send_data;
1269 } else
1270 return -1;
1271 }
1272 cmd->tx_size = 0;
1273
1274 return 0;
1275}
1276
1277int iscsit_fe_sendpage_sg(
1278 struct iscsi_cmd *cmd,
1279 struct iscsi_conn *conn)
1280{
1281 struct scatterlist *sg = cmd->first_data_sg;
1282 struct kvec iov;
1283 u32 tx_hdr_size, data_len;
1284 u32 offset = cmd->first_data_sg_off;
40b05497 1285 int tx_sent, iov_off;
e48354ce
NB		 1286
1287send_hdr:
1288 tx_hdr_size = ISCSI_HDR_LEN;
1289 if (conn->conn_ops->HeaderDigest)
1290 tx_hdr_size += ISCSI_CRC_LEN;
1291
1292 iov.iov_base = cmd->pdu;
1293 iov.iov_len = tx_hdr_size;
1294
1295 tx_sent = tx_data(conn, &iov, 1, tx_hdr_size);
1296 if (tx_hdr_size != tx_sent) {
1297 if (tx_sent == -EAGAIN) {
1298 pr_err("tx_data() returned -EAGAIN\n");
1299 goto send_hdr;
1300 }
1301 return -1;
1302 }
1303
1304 data_len = cmd->tx_size - tx_hdr_size - cmd->padding;
40b05497
NB		 1305 /*
1306 * Set iov_off used by padding and data digest tx_data() calls below
1307 * in order to determine proper offset into cmd->iov_data[]
1308 */
1309 if (conn->conn_ops->DataDigest) {
e48354ce 1310 data_len -= ISCSI_CRC_LEN;
40b05497
NB		 1311 if (cmd->padding)
1312 iov_off = (cmd->iov_data_count - 2);
1313 else
1314 iov_off = (cmd->iov_data_count - 1);
1315 } else {
1316 iov_off = (cmd->iov_data_count - 1);
1317 }
e48354ce
NB		 1318 /*
1319 * Perform sendpage() for each page in the scatterlist
1320 */
1321 while (data_len) {
1322 u32 space = (sg->length - offset);
1323 u32 sub_len = min_t(u32, data_len, space);
1324send_pg:
1325 tx_sent = conn->sock->ops->sendpage(conn->sock,
1326 sg_page(sg), sg->offset + offset, sub_len, 0);
1327 if (tx_sent != sub_len) {
1328 if (tx_sent == -EAGAIN) {
1329 pr_err("tcp_sendpage() returned"
1330 " -EAGAIN\n");
1331 goto send_pg;
1332 }
1333
1334 pr_err("tcp_sendpage() failure: %d\n",
1335 tx_sent);
1336 return -1;
1337 }
1338
1339 data_len -= sub_len;
1340 offset = 0;
1341 sg = sg_next(sg);
1342 }
1343
1344send_padding:
1345 if (cmd->padding) {
40b05497 1346 struct kvec *iov_p = &cmd->iov_data[iov_off++];
e48354ce
NB		 1347
1348 tx_sent = tx_data(conn, iov_p, 1, cmd->padding);
1349 if (cmd->padding != tx_sent) {
1350 if (tx_sent == -EAGAIN) {
1351 pr_err("tx_data() returned -EAGAIN\n");
1352 goto send_padding;
1353 }
1354 return -1;
1355 }
1356 }
1357
1358send_datacrc:
1359 if (conn->conn_ops->DataDigest) {
40b05497 1360 struct kvec *iov_d = &cmd->iov_data[iov_off];
e48354ce
NB		 1361
1362 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN);
1363 if (ISCSI_CRC_LEN != tx_sent) {
1364 if (tx_sent == -EAGAIN) {
1365 pr_err("tx_data() returned -EAGAIN\n");
1366 goto send_datacrc;
1367 }
1368 return -1;
1369 }
1370 }
1371
1372 return 0;
1373}
1374
1375/*
1376 * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU
1377 * back to the Initiator when an expection condition occurs with the
1378 * errors set in status_class and status_detail.
1379 *
1380 * Parameters: iSCSI Connection, Status Class, Status Detail.
1381 * Returns: 0 on success, -1 on error.
1382 */
1383int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail)
1384{
1385 u8 iscsi_hdr[ISCSI_HDR_LEN];
1386 int err;
1387 struct kvec iov;
1388 struct iscsi_login_rsp *hdr;
1389
1390 iscsit_collect_login_stats(conn, status_class, status_detail);
1391
1392 memset(&iov, 0, sizeof(struct kvec));
1393 memset(&iscsi_hdr, 0x0, ISCSI_HDR_LEN);
1394
1395 hdr = (struct iscsi_login_rsp *)&iscsi_hdr;
1396 hdr->opcode = ISCSI_OP_LOGIN_RSP;
1397 hdr->status_class = status_class;
1398 hdr->status_detail = status_detail;
1399 hdr->itt = cpu_to_be32(conn->login_itt);
1400
1401 iov.iov_base = &iscsi_hdr;
1402 iov.iov_len = ISCSI_HDR_LEN;
1403
1404 PRINT_BUFF(iscsi_hdr, ISCSI_HDR_LEN);
1405
1406 err = tx_data(conn, &iov, 1, ISCSI_HDR_LEN);
1407 if (err != ISCSI_HDR_LEN) {
1408 pr_err("tx_data returned less than expected\n");
1409 return -1;
1410 }
1411
1412 return 0;
1413}
1414
1415void iscsit_print_session_params(struct iscsi_session *sess)
1416{
1417 struct iscsi_conn *conn;
1418
1419 pr_debug("-----------------------------[Session Params for"
1420 " SID: %u]-----------------------------\n", sess->sid);
1421 spin_lock_bh(&sess->conn_lock);
1422 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
1423 iscsi_dump_conn_ops(conn->conn_ops);
1424 spin_unlock_bh(&sess->conn_lock);
1425
1426 iscsi_dump_sess_ops(sess->sess_ops);
1427}
1428
1429static int iscsit_do_rx_data(
1430 struct iscsi_conn *conn,
1431 struct iscsi_data_count *count)
1432{
1433 int data = count->data_length, rx_loop = 0, total_rx = 0, iov_len;
2ff017f5 1434 struct kvec *iov_p;
e48354ce
NB		 1435 struct msghdr msg;
1436
1437 if (!conn || !conn->sock || !conn->conn_ops)
1438 return -1;
1439
1440 memset(&msg, 0, sizeof(struct msghdr));
1441
2ff017f5
NB		 1442 iov_p = count->iov;
1443 iov_len = count->iov_count;
e48354ce
NB		 1444
1445 while (total_rx < data) {
1446 rx_loop = kernel_recvmsg(conn->sock, &msg, iov_p, iov_len,
1447 (data - total_rx), MSG_WAITALL);
1448 if (rx_loop <= 0) {
1449 pr_debug("rx_loop: %d total_rx: %d\n",
1450 rx_loop, total_rx);
1451 return rx_loop;
1452 }
1453 total_rx += rx_loop;
1454 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n",
1455 rx_loop, total_rx, data);
1456 }
1457
e48354ce
NB		 1458 return total_rx;
1459}
1460
1461static int iscsit_do_tx_data(
1462 struct iscsi_conn *conn,
1463 struct iscsi_data_count *count)
1464{
1465 int data = count->data_length, total_tx = 0, tx_loop = 0, iov_len;
2ff017f5 1466 struct kvec *iov_p;
e48354ce
NB		 1467 struct msghdr msg;
1468
1469 if (!conn || !conn->sock || !conn->conn_ops)
1470 return -1;
1471
1472 if (data <= 0) {
1473 pr_err("Data length is: %d\n", data);
1474 return -1;
1475 }
1476
1477 memset(&msg, 0, sizeof(struct msghdr));
1478
2ff017f5
NB		 1479 iov_p = count->iov;
1480 iov_len = count->iov_count;
e48354ce
NB		 1481
1482 while (total_tx < data) {
1483 tx_loop = kernel_sendmsg(conn->sock, &msg, iov_p, iov_len,
1484 (data - total_tx));
1485 if (tx_loop <= 0) {
1486 pr_debug("tx_loop: %d total_tx %d\n",
1487 tx_loop, total_tx);
1488 return tx_loop;
1489 }
1490 total_tx += tx_loop;
1491 pr_debug("tx_loop: %d, total_tx: %d, data: %d\n",
1492 tx_loop, total_tx, data);
1493 }
1494
e48354ce
NB		 1495 return total_tx;
1496}
1497
1498int rx_data(
1499 struct iscsi_conn *conn,
1500 struct kvec *iov,
1501 int iov_count,
1502 int data)
1503{
1504 struct iscsi_data_count c;
1505
1506 if (!conn || !conn->sock || !conn->conn_ops)
1507 return -1;
1508
1509 memset(&c, 0, sizeof(struct iscsi_data_count));
1510 c.iov = iov;
1511 c.iov_count = iov_count;
1512 c.data_length = data;
1513 c.type = ISCSI_RX_DATA;
1514
e48354ce
NB		 1515 return iscsit_do_rx_data(conn, &c);
1516}
1517
1518int tx_data(
1519 struct iscsi_conn *conn,
1520 struct kvec *iov,
1521 int iov_count,
1522 int data)
1523{
1524 struct iscsi_data_count c;
1525
1526 if (!conn || !conn->sock || !conn->conn_ops)
1527 return -1;
1528
1529 memset(&c, 0, sizeof(struct iscsi_data_count));
1530 c.iov = iov;
1531 c.iov_count = iov_count;
1532 c.data_length = data;
1533 c.type = ISCSI_TX_DATA;
1534
e48354ce
NB		 1535 return iscsit_do_tx_data(conn, &c);
1536}
1537
1538void iscsit_collect_login_stats(
1539 struct iscsi_conn *conn,
1540 u8 status_class,
1541 u8 status_detail)
1542{
1543 struct iscsi_param *intrname = NULL;
1544 struct iscsi_tiqn *tiqn;
1545 struct iscsi_login_stats *ls;
1546
1547 tiqn = iscsit_snmp_get_tiqn(conn);
1548 if (!tiqn)
1549 return;
1550
1551 ls = &tiqn->login_stats;
1552
1553 spin_lock(&ls->lock);
1554 if (!strcmp(conn->login_ip, ls->last_intr_fail_ip_addr) &&
1555 ((get_jiffies_64() - ls->last_fail_time) < 10)) {
1556 /* We already have the failure info for this login */
1557 spin_unlock(&ls->lock);
1558 return;
1559 }
1560
1561 if (status_class == ISCSI_STATUS_CLS_SUCCESS)
1562 ls->accepts++;
1563 else if (status_class == ISCSI_STATUS_CLS_REDIRECT) {
1564 ls->redirects++;
1565 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT;
1566 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1567 (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) {
1568 ls->authenticate_fails++;
1569 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE;
1570 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1571 (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) {
1572 ls->authorize_fails++;
1573 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE;
1574 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1575 (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) {
1576 ls->negotiate_fails++;
1577 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE;
1578 } else {
1579 ls->other_fails++;
1580 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER;
1581 }
1582
1583 /* Save initiator name, ip address and time, if it is a failed login */
1584 if (status_class != ISCSI_STATUS_CLS_SUCCESS) {
1585 if (conn->param_list)
1586 intrname = iscsi_find_param_from_key(INITIATORNAME,
1587 conn->param_list);
1588 strcpy(ls->last_intr_fail_name,
1589 (intrname ? intrname->value : "Unknown"));
1590
1591 ls->last_intr_fail_ip_family = conn->sock->sk->sk_family;
1592 snprintf(ls->last_intr_fail_ip_addr, IPV6_ADDRESS_SPACE,
1593 "%s", conn->login_ip);
1594 ls->last_fail_time = get_jiffies_64();
1595 }
1596
1597 spin_unlock(&ls->lock);
1598}
1599
1600struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn)
1601{
1602 struct iscsi_portal_group *tpg;
1603
1604 if (!conn || !conn->sess)
1605 return NULL;
1606
1607 tpg = conn->sess->tpg;
1608 if (!tpg)
1609 return NULL;
1610
1611 if (!tpg->tpg_tiqn)
1612 return NULL;
1613
1614 return tpg->tpg_tiqn;
1615}
kernel source for telekom puls (alcatel/mediatek)