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iscsi-target: Add iSCSI fabric support for target v4.1
[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>
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");
246 return NULL;
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);
301 if (se_cmd)
302 transport_free_se_cmd(se_cmd);
303 return NULL;
304}
305
306int iscsit_decide_list_to_build(
307 struct iscsi_cmd *cmd,
308 u32 immediate_data_length)
309{
310 struct iscsi_build_list bl;
311 struct iscsi_conn *conn = cmd->conn;
312 struct iscsi_session *sess = conn->sess;
313 struct iscsi_node_attrib *na;
314
315 if (sess->sess_ops->DataSequenceInOrder &&
316 sess->sess_ops->DataPDUInOrder)
317 return 0;
318
319 if (cmd->data_direction == DMA_NONE)
320 return 0;
321
322 na = iscsit_tpg_get_node_attrib(sess);
323 memset(&bl, 0, sizeof(struct iscsi_build_list));
324
325 if (cmd->data_direction == DMA_FROM_DEVICE) {
326 bl.data_direction = ISCSI_PDU_READ;
327 bl.type = PDULIST_NORMAL;
328 if (na->random_datain_pdu_offsets)
329 bl.randomize |= RANDOM_DATAIN_PDU_OFFSETS;
330 if (na->random_datain_seq_offsets)
331 bl.randomize |= RANDOM_DATAIN_SEQ_OFFSETS;
332 } else {
333 bl.data_direction = ISCSI_PDU_WRITE;
334 bl.immediate_data_length = immediate_data_length;
335 if (na->random_r2t_offsets)
336 bl.randomize |= RANDOM_R2T_OFFSETS;
337
338 if (!cmd->immediate_data && !cmd->unsolicited_data)
339 bl.type = PDULIST_NORMAL;
340 else if (cmd->immediate_data && !cmd->unsolicited_data)
341 bl.type = PDULIST_IMMEDIATE;
342 else if (!cmd->immediate_data && cmd->unsolicited_data)
343 bl.type = PDULIST_UNSOLICITED;
344 else if (cmd->immediate_data && cmd->unsolicited_data)
345 bl.type = PDULIST_IMMEDIATE_AND_UNSOLICITED;
346 }
347
348 return iscsit_do_build_list(cmd, &bl);
349}
350
351struct iscsi_seq *iscsit_get_seq_holder_for_datain(
352 struct iscsi_cmd *cmd,
353 u32 seq_send_order)
354{
355 u32 i;
356
357 for (i = 0; i < cmd->seq_count; i++)
358 if (cmd->seq_list[i].seq_send_order == seq_send_order)
359 return &cmd->seq_list[i];
360
361 return NULL;
362}
363
364struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsi_cmd *cmd)
365{
366 u32 i;
367
368 if (!cmd->seq_list) {
369 pr_err("struct iscsi_cmd->seq_list is NULL!\n");
370 return NULL;
371 }
372
373 for (i = 0; i < cmd->seq_count; i++) {
374 if (cmd->seq_list[i].type != SEQTYPE_NORMAL)
375 continue;
376 if (cmd->seq_list[i].seq_send_order == cmd->seq_send_order) {
377 cmd->seq_send_order++;
378 return &cmd->seq_list[i];
379 }
380 }
381
382 return NULL;
383}
384
385struct iscsi_r2t *iscsit_get_holder_for_r2tsn(
386 struct iscsi_cmd *cmd,
387 u32 r2t_sn)
388{
389 struct iscsi_r2t *r2t;
390
391 spin_lock_bh(&cmd->r2t_lock);
392 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
393 if (r2t->r2t_sn == r2t_sn) {
394 spin_unlock_bh(&cmd->r2t_lock);
395 return r2t;
396 }
397 }
398 spin_unlock_bh(&cmd->r2t_lock);
399
400 return NULL;
401}
402
403static inline int iscsit_check_received_cmdsn(struct iscsi_session *sess, u32 cmdsn)
404{
405 int ret;
406
407 /*
408 * This is the proper method of checking received CmdSN against
409 * ExpCmdSN and MaxCmdSN values, as well as accounting for out
410 * or order CmdSNs due to multiple connection sessions and/or
411 * CRC failures.
412 */
413 if (iscsi_sna_gt(cmdsn, sess->max_cmd_sn)) {
414 pr_err("Received CmdSN: 0x%08x is greater than"
415 " MaxCmdSN: 0x%08x, protocol error.\n", cmdsn,
416 sess->max_cmd_sn);
417 ret = CMDSN_ERROR_CANNOT_RECOVER;
418
419 } else if (cmdsn == sess->exp_cmd_sn) {
420 sess->exp_cmd_sn++;
421 pr_debug("Received CmdSN matches ExpCmdSN,"
422 " incremented ExpCmdSN to: 0x%08x\n",
423 sess->exp_cmd_sn);
424 ret = CMDSN_NORMAL_OPERATION;
425
426 } else if (iscsi_sna_gt(cmdsn, sess->exp_cmd_sn)) {
427 pr_debug("Received CmdSN: 0x%08x is greater"
428 " than ExpCmdSN: 0x%08x, not acknowledging.\n",
429 cmdsn, sess->exp_cmd_sn);
430 ret = CMDSN_HIGHER_THAN_EXP;
431
432 } else {
433 pr_err("Received CmdSN: 0x%08x is less than"
434 " ExpCmdSN: 0x%08x, ignoring.\n", cmdsn,
435 sess->exp_cmd_sn);
436 ret = CMDSN_LOWER_THAN_EXP;
437 }
438
439 return ret;
440}
441
442/*
443 * Commands may be received out of order if MC/S is in use.
444 * Ensure they are executed in CmdSN order.
445 */
446int iscsit_sequence_cmd(
447 struct iscsi_conn *conn,
448 struct iscsi_cmd *cmd,
449 u32 cmdsn)
450{
451 int ret;
452 int cmdsn_ret;
453
454 mutex_lock(&conn->sess->cmdsn_mutex);
455
456 cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, cmdsn);
457 switch (cmdsn_ret) {
458 case CMDSN_NORMAL_OPERATION:
459 ret = iscsit_execute_cmd(cmd, 0);
460 if ((ret >= 0) && !list_empty(&conn->sess->sess_ooo_cmdsn_list))
461 iscsit_execute_ooo_cmdsns(conn->sess);
462 break;
463 case CMDSN_HIGHER_THAN_EXP:
464 ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, cmdsn);
465 break;
466 case CMDSN_LOWER_THAN_EXP:
467 cmd->i_state = ISTATE_REMOVE;
468 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
469 ret = cmdsn_ret;
470 break;
471 default:
472 ret = cmdsn_ret;
473 break;
474 }
475 mutex_unlock(&conn->sess->cmdsn_mutex);
476
477 return ret;
478}
479
480int iscsit_check_unsolicited_dataout(struct iscsi_cmd *cmd, unsigned char *buf)
481{
482 struct iscsi_conn *conn = cmd->conn;
483 struct se_cmd *se_cmd = &cmd->se_cmd;
484 struct iscsi_data *hdr = (struct iscsi_data *) buf;
485 u32 payload_length = ntoh24(hdr->dlength);
486
487 if (conn->sess->sess_ops->InitialR2T) {
488 pr_err("Received unexpected unsolicited data"
489 " while InitialR2T=Yes, protocol error.\n");
490 transport_send_check_condition_and_sense(se_cmd,
491 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
492 return -1;
493 }
494
495 if ((cmd->first_burst_len + payload_length) >
496 conn->sess->sess_ops->FirstBurstLength) {
497 pr_err("Total %u bytes exceeds FirstBurstLength: %u"
498 " for this Unsolicited DataOut Burst.\n",
499 (cmd->first_burst_len + payload_length),
500 conn->sess->sess_ops->FirstBurstLength);
501 transport_send_check_condition_and_sense(se_cmd,
502 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
503 return -1;
504 }
505
506 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))
507 return 0;
508
509 if (((cmd->first_burst_len + payload_length) != cmd->data_length) &&
510 ((cmd->first_burst_len + payload_length) !=
511 conn->sess->sess_ops->FirstBurstLength)) {
512 pr_err("Unsolicited non-immediate data received %u"
513 " does not equal FirstBurstLength: %u, and does"
514 " not equal ExpXferLen %u.\n",
515 (cmd->first_burst_len + payload_length),
516 conn->sess->sess_ops->FirstBurstLength, cmd->data_length);
517 transport_send_check_condition_and_sense(se_cmd,
518 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
519 return -1;
520 }
521 return 0;
522}
523
524struct iscsi_cmd *iscsit_find_cmd_from_itt(
525 struct iscsi_conn *conn,
526 u32 init_task_tag)
527{
528 struct iscsi_cmd *cmd;
529
530 spin_lock_bh(&conn->cmd_lock);
531 list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
532 if (cmd->init_task_tag == init_task_tag) {
533 spin_unlock_bh(&conn->cmd_lock);
534 return cmd;
535 }
536 }
537 spin_unlock_bh(&conn->cmd_lock);
538
539 pr_err("Unable to locate ITT: 0x%08x on CID: %hu",
540 init_task_tag, conn->cid);
541 return NULL;
542}
543
544struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump(
545 struct iscsi_conn *conn,
546 u32 init_task_tag,
547 u32 length)
548{
549 struct iscsi_cmd *cmd;
550
551 spin_lock_bh(&conn->cmd_lock);
552 list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
553 if (cmd->init_task_tag == init_task_tag) {
554 spin_unlock_bh(&conn->cmd_lock);
555 return cmd;
556 }
557 }
558 spin_unlock_bh(&conn->cmd_lock);
559
560 pr_err("Unable to locate ITT: 0x%08x on CID: %hu,"
561 " dumping payload\n", init_task_tag, conn->cid);
562 if (length)
563 iscsit_dump_data_payload(conn, length, 1);
564
565 return NULL;
566}
567
568struct iscsi_cmd *iscsit_find_cmd_from_ttt(
569 struct iscsi_conn *conn,
570 u32 targ_xfer_tag)
571{
572 struct iscsi_cmd *cmd = NULL;
573
574 spin_lock_bh(&conn->cmd_lock);
575 list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
576 if (cmd->targ_xfer_tag == targ_xfer_tag) {
577 spin_unlock_bh(&conn->cmd_lock);
578 return cmd;
579 }
580 }
581 spin_unlock_bh(&conn->cmd_lock);
582
583 pr_err("Unable to locate TTT: 0x%08x on CID: %hu\n",
584 targ_xfer_tag, conn->cid);
585 return NULL;
586}
587
588int iscsit_find_cmd_for_recovery(
589 struct iscsi_session *sess,
590 struct iscsi_cmd **cmd_ptr,
591 struct iscsi_conn_recovery **cr_ptr,
592 u32 init_task_tag)
593{
594 struct iscsi_cmd *cmd = NULL;
595 struct iscsi_conn_recovery *cr;
596 /*
597 * Scan through the inactive connection recovery list's command list.
598 * If init_task_tag matches the command is still alligent.
599 */
600 spin_lock(&sess->cr_i_lock);
601 list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) {
602 spin_lock(&cr->conn_recovery_cmd_lock);
603 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_list) {
604 if (cmd->init_task_tag == init_task_tag) {
605 spin_unlock(&cr->conn_recovery_cmd_lock);
606 spin_unlock(&sess->cr_i_lock);
607
608 *cr_ptr = cr;
609 *cmd_ptr = cmd;
610 return -2;
611 }
612 }
613 spin_unlock(&cr->conn_recovery_cmd_lock);
614 }
615 spin_unlock(&sess->cr_i_lock);
616 /*
617 * Scan through the active connection recovery list's command list.
618 * If init_task_tag matches the command is ready to be reassigned.
619 */
620 spin_lock(&sess->cr_a_lock);
621 list_for_each_entry(cr, &sess->cr_active_list, cr_list) {
622 spin_lock(&cr->conn_recovery_cmd_lock);
623 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_list) {
624 if (cmd->init_task_tag == init_task_tag) {
625 spin_unlock(&cr->conn_recovery_cmd_lock);
626 spin_unlock(&sess->cr_a_lock);
627
628 *cr_ptr = cr;
629 *cmd_ptr = cmd;
630 return 0;
631 }
632 }
633 spin_unlock(&cr->conn_recovery_cmd_lock);
634 }
635 spin_unlock(&sess->cr_a_lock);
636
637 return -1;
638}
639
640void iscsit_add_cmd_to_immediate_queue(
641 struct iscsi_cmd *cmd,
642 struct iscsi_conn *conn,
643 u8 state)
644{
645 struct iscsi_queue_req *qr;
646
647 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
648 if (!qr) {
649 pr_err("Unable to allocate memory for"
650 " struct iscsi_queue_req\n");
651 return;
652 }
653 INIT_LIST_HEAD(&qr->qr_list);
654 qr->cmd = cmd;
655 qr->state = state;
656
657 spin_lock_bh(&conn->immed_queue_lock);
658 list_add_tail(&qr->qr_list, &conn->immed_queue_list);
659 atomic_inc(&cmd->immed_queue_count);
660 atomic_set(&conn->check_immediate_queue, 1);
661 spin_unlock_bh(&conn->immed_queue_lock);
662
663 wake_up_process(conn->thread_set->tx_thread);
664}
665
666struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *conn)
667{
668 struct iscsi_queue_req *qr;
669
670 spin_lock_bh(&conn->immed_queue_lock);
671 if (list_empty(&conn->immed_queue_list)) {
672 spin_unlock_bh(&conn->immed_queue_lock);
673 return NULL;
674 }
675 list_for_each_entry(qr, &conn->immed_queue_list, qr_list)
676 break;
677
678 list_del(&qr->qr_list);
679 if (qr->cmd)
680 atomic_dec(&qr->cmd->immed_queue_count);
681 spin_unlock_bh(&conn->immed_queue_lock);
682
683 return qr;
684}
685
686static void iscsit_remove_cmd_from_immediate_queue(
687 struct iscsi_cmd *cmd,
688 struct iscsi_conn *conn)
689{
690 struct iscsi_queue_req *qr, *qr_tmp;
691
692 spin_lock_bh(&conn->immed_queue_lock);
693 if (!atomic_read(&cmd->immed_queue_count)) {
694 spin_unlock_bh(&conn->immed_queue_lock);
695 return;
696 }
697
698 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
699 if (qr->cmd != cmd)
700 continue;
701
702 atomic_dec(&qr->cmd->immed_queue_count);
703 list_del(&qr->qr_list);
704 kmem_cache_free(lio_qr_cache, qr);
705 }
706 spin_unlock_bh(&conn->immed_queue_lock);
707
708 if (atomic_read(&cmd->immed_queue_count)) {
709 pr_err("ITT: 0x%08x immed_queue_count: %d\n",
710 cmd->init_task_tag,
711 atomic_read(&cmd->immed_queue_count));
712 }
713}
714
715void iscsit_add_cmd_to_response_queue(
716 struct iscsi_cmd *cmd,
717 struct iscsi_conn *conn,
718 u8 state)
719{
720 struct iscsi_queue_req *qr;
721
722 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
723 if (!qr) {
724 pr_err("Unable to allocate memory for"
725 " struct iscsi_queue_req\n");
726 return;
727 }
728 INIT_LIST_HEAD(&qr->qr_list);
729 qr->cmd = cmd;
730 qr->state = state;
731
732 spin_lock_bh(&conn->response_queue_lock);
733 list_add_tail(&qr->qr_list, &conn->response_queue_list);
734 atomic_inc(&cmd->response_queue_count);
735 spin_unlock_bh(&conn->response_queue_lock);
736
737 wake_up_process(conn->thread_set->tx_thread);
738}
739
740struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *conn)
741{
742 struct iscsi_queue_req *qr;
743
744 spin_lock_bh(&conn->response_queue_lock);
745 if (list_empty(&conn->response_queue_list)) {
746 spin_unlock_bh(&conn->response_queue_lock);
747 return NULL;
748 }
749
750 list_for_each_entry(qr, &conn->response_queue_list, qr_list)
751 break;
752
753 list_del(&qr->qr_list);
754 if (qr->cmd)
755 atomic_dec(&qr->cmd->response_queue_count);
756 spin_unlock_bh(&conn->response_queue_lock);
757
758 return qr;
759}
760
761static void iscsit_remove_cmd_from_response_queue(
762 struct iscsi_cmd *cmd,
763 struct iscsi_conn *conn)
764{
765 struct iscsi_queue_req *qr, *qr_tmp;
766
767 spin_lock_bh(&conn->response_queue_lock);
768 if (!atomic_read(&cmd->response_queue_count)) {
769 spin_unlock_bh(&conn->response_queue_lock);
770 return;
771 }
772
773 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
774 qr_list) {
775 if (qr->cmd != cmd)
776 continue;
777
778 atomic_dec(&qr->cmd->response_queue_count);
779 list_del(&qr->qr_list);
780 kmem_cache_free(lio_qr_cache, qr);
781 }
782 spin_unlock_bh(&conn->response_queue_lock);
783
784 if (atomic_read(&cmd->response_queue_count)) {
785 pr_err("ITT: 0x%08x response_queue_count: %d\n",
786 cmd->init_task_tag,
787 atomic_read(&cmd->response_queue_count));
788 }
789}
790
791void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn)
792{
793 struct iscsi_queue_req *qr, *qr_tmp;
794
795 spin_lock_bh(&conn->immed_queue_lock);
796 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
797 list_del(&qr->qr_list);
798 if (qr->cmd)
799 atomic_dec(&qr->cmd->immed_queue_count);
800
801 kmem_cache_free(lio_qr_cache, qr);
802 }
803 spin_unlock_bh(&conn->immed_queue_lock);
804
805 spin_lock_bh(&conn->response_queue_lock);
806 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
807 qr_list) {
808 list_del(&qr->qr_list);
809 if (qr->cmd)
810 atomic_dec(&qr->cmd->response_queue_count);
811
812 kmem_cache_free(lio_qr_cache, qr);
813 }
814 spin_unlock_bh(&conn->response_queue_lock);
815}
816
817void iscsit_release_cmd(struct iscsi_cmd *cmd)
818{
819 struct iscsi_conn *conn = cmd->conn;
820 int i;
821
822 iscsit_free_r2ts_from_list(cmd);
823 iscsit_free_all_datain_reqs(cmd);
824
825 kfree(cmd->buf_ptr);
826 kfree(cmd->pdu_list);
827 kfree(cmd->seq_list);
828 kfree(cmd->tmr_req);
829 kfree(cmd->iov_data);
830
831 for (i = 0; i < cmd->t_mem_sg_nents; i++)
832 __free_page(sg_page(&cmd->t_mem_sg[i]));
833
834 kfree(cmd->t_mem_sg);
835
836 if (conn) {
837 iscsit_remove_cmd_from_immediate_queue(cmd, conn);
838 iscsit_remove_cmd_from_response_queue(cmd, conn);
839 }
840
841 kmem_cache_free(lio_cmd_cache, cmd);
842}
843
844int iscsit_check_session_usage_count(struct iscsi_session *sess)
845{
846 spin_lock_bh(&sess->session_usage_lock);
847 if (sess->session_usage_count != 0) {
848 sess->session_waiting_on_uc = 1;
849 spin_unlock_bh(&sess->session_usage_lock);
850 if (in_interrupt())
851 return 2;
852
853 wait_for_completion(&sess->session_waiting_on_uc_comp);
854 return 1;
855 }
856 spin_unlock_bh(&sess->session_usage_lock);
857
858 return 0;
859}
860
861void iscsit_dec_session_usage_count(struct iscsi_session *sess)
862{
863 spin_lock_bh(&sess->session_usage_lock);
864 sess->session_usage_count--;
865
866 if (!sess->session_usage_count && sess->session_waiting_on_uc)
867 complete(&sess->session_waiting_on_uc_comp);
868
869 spin_unlock_bh(&sess->session_usage_lock);
870}
871
872void iscsit_inc_session_usage_count(struct iscsi_session *sess)
873{
874 spin_lock_bh(&sess->session_usage_lock);
875 sess->session_usage_count++;
876 spin_unlock_bh(&sess->session_usage_lock);
877}
878
879/*
880 * Used before iscsi_do[rx,tx]_data() to determine iov and [rx,tx]_marker
881 * array counts needed for sync and steering.
882 */
883static int iscsit_determine_sync_and_steering_counts(
884 struct iscsi_conn *conn,
885 struct iscsi_data_count *count)
886{
887 u32 length = count->data_length;
888 u32 marker, markint;
889
890 count->sync_and_steering = 1;
891
892 marker = (count->type == ISCSI_RX_DATA) ?
893 conn->of_marker : conn->if_marker;
894 markint = (count->type == ISCSI_RX_DATA) ?
895 (conn->conn_ops->OFMarkInt * 4) :
896 (conn->conn_ops->IFMarkInt * 4);
897 count->ss_iov_count = count->iov_count;
898
899 while (length > 0) {
900 if (length >= marker) {
901 count->ss_iov_count += 3;
902 count->ss_marker_count += 2;
903
904 length -= marker;
905 marker = markint;
906 } else
907 length = 0;
908 }
909
910 return 0;
911}
912
913/*
914 * Setup conn->if_marker and conn->of_marker values based upon
915 * the initial marker-less interval. (see iSCSI v19 A.2)
916 */
917int iscsit_set_sync_and_steering_values(struct iscsi_conn *conn)
918{
919 int login_ifmarker_count = 0, login_ofmarker_count = 0, next_marker = 0;
920 /*
921 * IFMarkInt and OFMarkInt are negotiated as 32-bit words.
922 */
923 u32 IFMarkInt = (conn->conn_ops->IFMarkInt * 4);
924 u32 OFMarkInt = (conn->conn_ops->OFMarkInt * 4);
925
926 if (conn->conn_ops->OFMarker) {
927 /*
928 * Account for the first Login Command received not
929 * via iscsi_recv_msg().
930 */
931 conn->of_marker += ISCSI_HDR_LEN;
932 if (conn->of_marker <= OFMarkInt) {
933 conn->of_marker = (OFMarkInt - conn->of_marker);
934 } else {
935 login_ofmarker_count = (conn->of_marker / OFMarkInt);
936 next_marker = (OFMarkInt * (login_ofmarker_count + 1)) +
937 (login_ofmarker_count * MARKER_SIZE);
938 conn->of_marker = (next_marker - conn->of_marker);
939 }
940 conn->of_marker_offset = 0;
941 pr_debug("Setting OFMarker value to %u based on Initial"
942 " Markerless Interval.\n", conn->of_marker);
943 }
944
945 if (conn->conn_ops->IFMarker) {
946 if (conn->if_marker <= IFMarkInt) {
947 conn->if_marker = (IFMarkInt - conn->if_marker);
948 } else {
949 login_ifmarker_count = (conn->if_marker / IFMarkInt);
950 next_marker = (IFMarkInt * (login_ifmarker_count + 1)) +
951 (login_ifmarker_count * MARKER_SIZE);
952 conn->if_marker = (next_marker - conn->if_marker);
953 }
954 pr_debug("Setting IFMarker value to %u based on Initial"
955 " Markerless Interval.\n", conn->if_marker);
956 }
957
958 return 0;
959}
960
961struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid)
962{
963 struct iscsi_conn *conn;
964
965 spin_lock_bh(&sess->conn_lock);
966 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
967 if ((conn->cid == cid) &&
968 (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) {
969 iscsit_inc_conn_usage_count(conn);
970 spin_unlock_bh(&sess->conn_lock);
971 return conn;
972 }
973 }
974 spin_unlock_bh(&sess->conn_lock);
975
976 return NULL;
977}
978
979struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid)
980{
981 struct iscsi_conn *conn;
982
983 spin_lock_bh(&sess->conn_lock);
984 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
985 if (conn->cid == cid) {
986 iscsit_inc_conn_usage_count(conn);
987 spin_lock(&conn->state_lock);
988 atomic_set(&conn->connection_wait_rcfr, 1);
989 spin_unlock(&conn->state_lock);
990 spin_unlock_bh(&sess->conn_lock);
991 return conn;
992 }
993 }
994 spin_unlock_bh(&sess->conn_lock);
995
996 return NULL;
997}
998
999void iscsit_check_conn_usage_count(struct iscsi_conn *conn)
1000{
1001 spin_lock_bh(&conn->conn_usage_lock);
1002 if (conn->conn_usage_count != 0) {
1003 conn->conn_waiting_on_uc = 1;
1004 spin_unlock_bh(&conn->conn_usage_lock);
1005
1006 wait_for_completion(&conn->conn_waiting_on_uc_comp);
1007 return;
1008 }
1009 spin_unlock_bh(&conn->conn_usage_lock);
1010}
1011
1012void iscsit_dec_conn_usage_count(struct iscsi_conn *conn)
1013{
1014 spin_lock_bh(&conn->conn_usage_lock);
1015 conn->conn_usage_count--;
1016
1017 if (!conn->conn_usage_count && conn->conn_waiting_on_uc)
1018 complete(&conn->conn_waiting_on_uc_comp);
1019
1020 spin_unlock_bh(&conn->conn_usage_lock);
1021}
1022
1023void iscsit_inc_conn_usage_count(struct iscsi_conn *conn)
1024{
1025 spin_lock_bh(&conn->conn_usage_lock);
1026 conn->conn_usage_count++;
1027 spin_unlock_bh(&conn->conn_usage_lock);
1028}
1029
1030static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response)
1031{
1032 u8 state;
1033 struct iscsi_cmd *cmd;
1034
1035 cmd = iscsit_allocate_cmd(conn, GFP_ATOMIC);
1036 if (!cmd)
1037 return -1;
1038
1039 cmd->iscsi_opcode = ISCSI_OP_NOOP_IN;
1040 state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE :
1041 ISTATE_SEND_NOPIN_NO_RESPONSE;
1042 cmd->init_task_tag = 0xFFFFFFFF;
1043 spin_lock_bh(&conn->sess->ttt_lock);
1044 cmd->targ_xfer_tag = (want_response) ? conn->sess->targ_xfer_tag++ :
1045 0xFFFFFFFF;
1046 if (want_response && (cmd->targ_xfer_tag == 0xFFFFFFFF))
1047 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
1048 spin_unlock_bh(&conn->sess->ttt_lock);
1049
1050 spin_lock_bh(&conn->cmd_lock);
1051 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1052 spin_unlock_bh(&conn->cmd_lock);
1053
1054 if (want_response)
1055 iscsit_start_nopin_response_timer(conn);
1056 iscsit_add_cmd_to_immediate_queue(cmd, conn, state);
1057
1058 return 0;
1059}
1060
1061static void iscsit_handle_nopin_response_timeout(unsigned long data)
1062{
1063 struct iscsi_conn *conn = (struct iscsi_conn *) data;
1064
1065 iscsit_inc_conn_usage_count(conn);
1066
1067 spin_lock_bh(&conn->nopin_timer_lock);
1068 if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) {
1069 spin_unlock_bh(&conn->nopin_timer_lock);
1070 iscsit_dec_conn_usage_count(conn);
1071 return;
1072 }
1073
1074 pr_debug("Did not receive response to NOPIN on CID: %hu on"
1075 " SID: %u, failing connection.\n", conn->cid,
1076 conn->sess->sid);
1077 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
1078 spin_unlock_bh(&conn->nopin_timer_lock);
1079
1080 {
1081 struct iscsi_portal_group *tpg = conn->sess->tpg;
1082 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
1083
1084 if (tiqn) {
1085 spin_lock_bh(&tiqn->sess_err_stats.lock);
1086 strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
1087 (void *)conn->sess->sess_ops->InitiatorName);
1088 tiqn->sess_err_stats.last_sess_failure_type =
1089 ISCSI_SESS_ERR_CXN_TIMEOUT;
1090 tiqn->sess_err_stats.cxn_timeout_errors++;
1091 conn->sess->conn_timeout_errors++;
1092 spin_unlock_bh(&tiqn->sess_err_stats.lock);
1093 }
1094 }
1095
1096 iscsit_cause_connection_reinstatement(conn, 0);
1097 iscsit_dec_conn_usage_count(conn);
1098}
1099
1100void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn)
1101{
1102 struct iscsi_session *sess = conn->sess;
1103 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1104
1105 spin_lock_bh(&conn->nopin_timer_lock);
1106 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
1107 spin_unlock_bh(&conn->nopin_timer_lock);
1108 return;
1109 }
1110
1111 mod_timer(&conn->nopin_response_timer,
1112 (get_jiffies_64() + na->nopin_response_timeout * HZ));
1113 spin_unlock_bh(&conn->nopin_timer_lock);
1114}
1115
1116/*
1117 * Called with conn->nopin_timer_lock held.
1118 */
1119void iscsit_start_nopin_response_timer(struct iscsi_conn *conn)
1120{
1121 struct iscsi_session *sess = conn->sess;
1122 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1123
1124 spin_lock_bh(&conn->nopin_timer_lock);
1125 if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) {
1126 spin_unlock_bh(&conn->nopin_timer_lock);
1127 return;
1128 }
1129
1130 init_timer(&conn->nopin_response_timer);
1131 conn->nopin_response_timer.expires =
1132 (get_jiffies_64() + na->nopin_response_timeout * HZ);
1133 conn->nopin_response_timer.data = (unsigned long)conn;
1134 conn->nopin_response_timer.function = iscsit_handle_nopin_response_timeout;
1135 conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP;
1136 conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING;
1137 add_timer(&conn->nopin_response_timer);
1138
1139 pr_debug("Started NOPIN Response Timer on CID: %d to %u"
1140 " seconds\n", conn->cid, na->nopin_response_timeout);
1141 spin_unlock_bh(&conn->nopin_timer_lock);
1142}
1143
1144void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn)
1145{
1146 spin_lock_bh(&conn->nopin_timer_lock);
1147 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
1148 spin_unlock_bh(&conn->nopin_timer_lock);
1149 return;
1150 }
1151 conn->nopin_response_timer_flags |= ISCSI_TF_STOP;
1152 spin_unlock_bh(&conn->nopin_timer_lock);
1153
1154 del_timer_sync(&conn->nopin_response_timer);
1155
1156 spin_lock_bh(&conn->nopin_timer_lock);
1157 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
1158 spin_unlock_bh(&conn->nopin_timer_lock);
1159}
1160
1161static void iscsit_handle_nopin_timeout(unsigned long data)
1162{
1163 struct iscsi_conn *conn = (struct iscsi_conn *) data;
1164
1165 iscsit_inc_conn_usage_count(conn);
1166
1167 spin_lock_bh(&conn->nopin_timer_lock);
1168 if (conn->nopin_timer_flags & ISCSI_TF_STOP) {
1169 spin_unlock_bh(&conn->nopin_timer_lock);
1170 iscsit_dec_conn_usage_count(conn);
1171 return;
1172 }
1173 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1174 spin_unlock_bh(&conn->nopin_timer_lock);
1175
1176 iscsit_add_nopin(conn, 1);
1177 iscsit_dec_conn_usage_count(conn);
1178}
1179
1180/*
1181 * Called with conn->nopin_timer_lock held.
1182 */
1183void __iscsit_start_nopin_timer(struct iscsi_conn *conn)
1184{
1185 struct iscsi_session *sess = conn->sess;
1186 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1187 /*
1188 * NOPIN timeout is disabled.
1189 */
1190 if (!na->nopin_timeout)
1191 return;
1192
1193 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING)
1194 return;
1195
1196 init_timer(&conn->nopin_timer);
1197 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1198 conn->nopin_timer.data = (unsigned long)conn;
1199 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1200 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1201 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1202 add_timer(&conn->nopin_timer);
1203
1204 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1205 " interval\n", conn->cid, na->nopin_timeout);
1206}
1207
1208void iscsit_start_nopin_timer(struct iscsi_conn *conn)
1209{
1210 struct iscsi_session *sess = conn->sess;
1211 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1212 /*
1213 * NOPIN timeout is disabled..
1214 */
1215 if (!na->nopin_timeout)
1216 return;
1217
1218 spin_lock_bh(&conn->nopin_timer_lock);
1219 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) {
1220 spin_unlock_bh(&conn->nopin_timer_lock);
1221 return;
1222 }
1223
1224 init_timer(&conn->nopin_timer);
1225 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1226 conn->nopin_timer.data = (unsigned long)conn;
1227 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1228 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1229 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1230 add_timer(&conn->nopin_timer);
1231
1232 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1233 " interval\n", conn->cid, na->nopin_timeout);
1234 spin_unlock_bh(&conn->nopin_timer_lock);
1235}
1236
1237void iscsit_stop_nopin_timer(struct iscsi_conn *conn)
1238{
1239 spin_lock_bh(&conn->nopin_timer_lock);
1240 if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) {
1241 spin_unlock_bh(&conn->nopin_timer_lock);
1242 return;
1243 }
1244 conn->nopin_timer_flags |= ISCSI_TF_STOP;
1245 spin_unlock_bh(&conn->nopin_timer_lock);
1246
1247 del_timer_sync(&conn->nopin_timer);
1248
1249 spin_lock_bh(&conn->nopin_timer_lock);
1250 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1251 spin_unlock_bh(&conn->nopin_timer_lock);
1252}
1253
1254int iscsit_send_tx_data(
1255 struct iscsi_cmd *cmd,
1256 struct iscsi_conn *conn,
1257 int use_misc)
1258{
1259 int tx_sent, tx_size;
1260 u32 iov_count;
1261 struct kvec *iov;
1262
1263send_data:
1264 tx_size = cmd->tx_size;
1265
1266 if (!use_misc) {
1267 iov = &cmd->iov_data[0];
1268 iov_count = cmd->iov_data_count;
1269 } else {
1270 iov = &cmd->iov_misc[0];
1271 iov_count = cmd->iov_misc_count;
1272 }
1273
1274 tx_sent = tx_data(conn, &iov[0], iov_count, tx_size);
1275 if (tx_size != tx_sent) {
1276 if (tx_sent == -EAGAIN) {
1277 pr_err("tx_data() returned -EAGAIN\n");
1278 goto send_data;
1279 } else
1280 return -1;
1281 }
1282 cmd->tx_size = 0;
1283
1284 return 0;
1285}
1286
1287int iscsit_fe_sendpage_sg(
1288 struct iscsi_cmd *cmd,
1289 struct iscsi_conn *conn)
1290{
1291 struct scatterlist *sg = cmd->first_data_sg;
1292 struct kvec iov;
1293 u32 tx_hdr_size, data_len;
1294 u32 offset = cmd->first_data_sg_off;
1295 int tx_sent;
1296
1297send_hdr:
1298 tx_hdr_size = ISCSI_HDR_LEN;
1299 if (conn->conn_ops->HeaderDigest)
1300 tx_hdr_size += ISCSI_CRC_LEN;
1301
1302 iov.iov_base = cmd->pdu;
1303 iov.iov_len = tx_hdr_size;
1304
1305 tx_sent = tx_data(conn, &iov, 1, tx_hdr_size);
1306 if (tx_hdr_size != tx_sent) {
1307 if (tx_sent == -EAGAIN) {
1308 pr_err("tx_data() returned -EAGAIN\n");
1309 goto send_hdr;
1310 }
1311 return -1;
1312 }
1313
1314 data_len = cmd->tx_size - tx_hdr_size - cmd->padding;
1315 if (conn->conn_ops->DataDigest)
1316 data_len -= ISCSI_CRC_LEN;
1317
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) {
1346 struct kvec *iov_p =
1347 &cmd->iov_data[cmd->iov_data_count-1];
1348
1349 tx_sent = tx_data(conn, iov_p, 1, cmd->padding);
1350 if (cmd->padding != tx_sent) {
1351 if (tx_sent == -EAGAIN) {
1352 pr_err("tx_data() returned -EAGAIN\n");
1353 goto send_padding;
1354 }
1355 return -1;
1356 }
1357 }
1358
1359send_datacrc:
1360 if (conn->conn_ops->DataDigest) {
1361 struct kvec *iov_d =
1362 &cmd->iov_data[cmd->iov_data_count];
1363
1364 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN);
1365 if (ISCSI_CRC_LEN != tx_sent) {
1366 if (tx_sent == -EAGAIN) {
1367 pr_err("tx_data() returned -EAGAIN\n");
1368 goto send_datacrc;
1369 }
1370 return -1;
1371 }
1372 }
1373
1374 return 0;
1375}
1376
1377/*
1378 * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU
1379 * back to the Initiator when an expection condition occurs with the
1380 * errors set in status_class and status_detail.
1381 *
1382 * Parameters: iSCSI Connection, Status Class, Status Detail.
1383 * Returns: 0 on success, -1 on error.
1384 */
1385int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail)
1386{
1387 u8 iscsi_hdr[ISCSI_HDR_LEN];
1388 int err;
1389 struct kvec iov;
1390 struct iscsi_login_rsp *hdr;
1391
1392 iscsit_collect_login_stats(conn, status_class, status_detail);
1393
1394 memset(&iov, 0, sizeof(struct kvec));
1395 memset(&iscsi_hdr, 0x0, ISCSI_HDR_LEN);
1396
1397 hdr = (struct iscsi_login_rsp *)&iscsi_hdr;
1398 hdr->opcode = ISCSI_OP_LOGIN_RSP;
1399 hdr->status_class = status_class;
1400 hdr->status_detail = status_detail;
1401 hdr->itt = cpu_to_be32(conn->login_itt);
1402
1403 iov.iov_base = &iscsi_hdr;
1404 iov.iov_len = ISCSI_HDR_LEN;
1405
1406 PRINT_BUFF(iscsi_hdr, ISCSI_HDR_LEN);
1407
1408 err = tx_data(conn, &iov, 1, ISCSI_HDR_LEN);
1409 if (err != ISCSI_HDR_LEN) {
1410 pr_err("tx_data returned less than expected\n");
1411 return -1;
1412 }
1413
1414 return 0;
1415}
1416
1417void iscsit_print_session_params(struct iscsi_session *sess)
1418{
1419 struct iscsi_conn *conn;
1420
1421 pr_debug("-----------------------------[Session Params for"
1422 " SID: %u]-----------------------------\n", sess->sid);
1423 spin_lock_bh(&sess->conn_lock);
1424 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
1425 iscsi_dump_conn_ops(conn->conn_ops);
1426 spin_unlock_bh(&sess->conn_lock);
1427
1428 iscsi_dump_sess_ops(sess->sess_ops);
1429}
1430
1431static int iscsit_do_rx_data(
1432 struct iscsi_conn *conn,
1433 struct iscsi_data_count *count)
1434{
1435 int data = count->data_length, rx_loop = 0, total_rx = 0, iov_len;
1436 u32 rx_marker_val[count->ss_marker_count], rx_marker_iov = 0;
1437 struct kvec iov[count->ss_iov_count], *iov_p;
1438 struct msghdr msg;
1439
1440 if (!conn || !conn->sock || !conn->conn_ops)
1441 return -1;
1442
1443 memset(&msg, 0, sizeof(struct msghdr));
1444
1445 if (count->sync_and_steering) {
1446 int size = 0;
1447 u32 i, orig_iov_count = 0;
1448 u32 orig_iov_len = 0, orig_iov_loc = 0;
1449 u32 iov_count = 0, per_iov_bytes = 0;
1450 u32 *rx_marker, old_rx_marker = 0;
1451 struct kvec *iov_record;
1452
1453 memset(&rx_marker_val, 0,
1454 count->ss_marker_count * sizeof(u32));
1455 memset(&iov, 0, count->ss_iov_count * sizeof(struct kvec));
1456
1457 iov_record = count->iov;
1458 orig_iov_count = count->iov_count;
1459 rx_marker = &conn->of_marker;
1460
1461 i = 0;
1462 size = data;
1463 orig_iov_len = iov_record[orig_iov_loc].iov_len;
1464 while (size > 0) {
1465 pr_debug("rx_data: #1 orig_iov_len %u,"
1466 " orig_iov_loc %u\n", orig_iov_len, orig_iov_loc);
1467 pr_debug("rx_data: #2 rx_marker %u, size"
1468 " %u\n", *rx_marker, size);
1469
1470 if (orig_iov_len >= *rx_marker) {
1471 iov[iov_count].iov_len = *rx_marker;
1472 iov[iov_count++].iov_base =
1473 (iov_record[orig_iov_loc].iov_base +
1474 per_iov_bytes);
1475
1476 iov[iov_count].iov_len = (MARKER_SIZE / 2);
1477 iov[iov_count++].iov_base =
1478 &rx_marker_val[rx_marker_iov++];
1479 iov[iov_count].iov_len = (MARKER_SIZE / 2);
1480 iov[iov_count++].iov_base =
1481 &rx_marker_val[rx_marker_iov++];
1482 old_rx_marker = *rx_marker;
1483
1484 /*
1485 * OFMarkInt is in 32-bit words.
1486 */
1487 *rx_marker = (conn->conn_ops->OFMarkInt * 4);
1488 size -= old_rx_marker;
1489 orig_iov_len -= old_rx_marker;
1490 per_iov_bytes += old_rx_marker;
1491
1492 pr_debug("rx_data: #3 new_rx_marker"
1493 " %u, size %u\n", *rx_marker, size);
1494 } else {
1495 iov[iov_count].iov_len = orig_iov_len;
1496 iov[iov_count++].iov_base =
1497 (iov_record[orig_iov_loc].iov_base +
1498 per_iov_bytes);
1499
1500 per_iov_bytes = 0;
1501 *rx_marker -= orig_iov_len;
1502 size -= orig_iov_len;
1503
1504 if (size)
1505 orig_iov_len =
1506 iov_record[++orig_iov_loc].iov_len;
1507
1508 pr_debug("rx_data: #4 new_rx_marker"
1509 " %u, size %u\n", *rx_marker, size);
1510 }
1511 }
1512 data += (rx_marker_iov * (MARKER_SIZE / 2));
1513
1514 iov_p = &iov[0];
1515 iov_len = iov_count;
1516
1517 if (iov_count > count->ss_iov_count) {
1518 pr_err("iov_count: %d, count->ss_iov_count:"
1519 " %d\n", iov_count, count->ss_iov_count);
1520 return -1;
1521 }
1522 if (rx_marker_iov > count->ss_marker_count) {
1523 pr_err("rx_marker_iov: %d, count->ss_marker"
1524 "_count: %d\n", rx_marker_iov,
1525 count->ss_marker_count);
1526 return -1;
1527 }
1528 } else {
1529 iov_p = count->iov;
1530 iov_len = count->iov_count;
1531 }
1532
1533 while (total_rx < data) {
1534 rx_loop = kernel_recvmsg(conn->sock, &msg, iov_p, iov_len,
1535 (data - total_rx), MSG_WAITALL);
1536 if (rx_loop <= 0) {
1537 pr_debug("rx_loop: %d total_rx: %d\n",
1538 rx_loop, total_rx);
1539 return rx_loop;
1540 }
1541 total_rx += rx_loop;
1542 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n",
1543 rx_loop, total_rx, data);
1544 }
1545
1546 if (count->sync_and_steering) {
1547 int j;
1548 for (j = 0; j < rx_marker_iov; j++) {
1549 pr_debug("rx_data: #5 j: %d, offset: %d\n",
1550 j, rx_marker_val[j]);
1551 conn->of_marker_offset = rx_marker_val[j];
1552 }
1553 total_rx -= (rx_marker_iov * (MARKER_SIZE / 2));
1554 }
1555
1556 return total_rx;
1557}
1558
1559static int iscsit_do_tx_data(
1560 struct iscsi_conn *conn,
1561 struct iscsi_data_count *count)
1562{
1563 int data = count->data_length, total_tx = 0, tx_loop = 0, iov_len;
1564 u32 tx_marker_val[count->ss_marker_count], tx_marker_iov = 0;
1565 struct kvec iov[count->ss_iov_count], *iov_p;
1566 struct msghdr msg;
1567
1568 if (!conn || !conn->sock || !conn->conn_ops)
1569 return -1;
1570
1571 if (data <= 0) {
1572 pr_err("Data length is: %d\n", data);
1573 return -1;
1574 }
1575
1576 memset(&msg, 0, sizeof(struct msghdr));
1577
1578 if (count->sync_and_steering) {
1579 int size = 0;
1580 u32 i, orig_iov_count = 0;
1581 u32 orig_iov_len = 0, orig_iov_loc = 0;
1582 u32 iov_count = 0, per_iov_bytes = 0;
1583 u32 *tx_marker, old_tx_marker = 0;
1584 struct kvec *iov_record;
1585
1586 memset(&tx_marker_val, 0,
1587 count->ss_marker_count * sizeof(u32));
1588 memset(&iov, 0, count->ss_iov_count * sizeof(struct kvec));
1589
1590 iov_record = count->iov;
1591 orig_iov_count = count->iov_count;
1592 tx_marker = &conn->if_marker;
1593
1594 i = 0;
1595 size = data;
1596 orig_iov_len = iov_record[orig_iov_loc].iov_len;
1597 while (size > 0) {
1598 pr_debug("tx_data: #1 orig_iov_len %u,"
1599 " orig_iov_loc %u\n", orig_iov_len, orig_iov_loc);
1600 pr_debug("tx_data: #2 tx_marker %u, size"
1601 " %u\n", *tx_marker, size);
1602
1603 if (orig_iov_len >= *tx_marker) {
1604 iov[iov_count].iov_len = *tx_marker;
1605 iov[iov_count++].iov_base =
1606 (iov_record[orig_iov_loc].iov_base +
1607 per_iov_bytes);
1608
1609 tx_marker_val[tx_marker_iov] =
1610 (size - *tx_marker);
1611 iov[iov_count].iov_len = (MARKER_SIZE / 2);
1612 iov[iov_count++].iov_base =
1613 &tx_marker_val[tx_marker_iov++];
1614 iov[iov_count].iov_len = (MARKER_SIZE / 2);
1615 iov[iov_count++].iov_base =
1616 &tx_marker_val[tx_marker_iov++];
1617 old_tx_marker = *tx_marker;
1618
1619 /*
1620 * IFMarkInt is in 32-bit words.
1621 */
1622 *tx_marker = (conn->conn_ops->IFMarkInt * 4);
1623 size -= old_tx_marker;
1624 orig_iov_len -= old_tx_marker;
1625 per_iov_bytes += old_tx_marker;
1626
1627 pr_debug("tx_data: #3 new_tx_marker"
1628 " %u, size %u\n", *tx_marker, size);
1629 pr_debug("tx_data: #4 offset %u\n",
1630 tx_marker_val[tx_marker_iov-1]);
1631 } else {
1632 iov[iov_count].iov_len = orig_iov_len;
1633 iov[iov_count++].iov_base
1634 = (iov_record[orig_iov_loc].iov_base +
1635 per_iov_bytes);
1636
1637 per_iov_bytes = 0;
1638 *tx_marker -= orig_iov_len;
1639 size -= orig_iov_len;
1640
1641 if (size)
1642 orig_iov_len =
1643 iov_record[++orig_iov_loc].iov_len;
1644
1645 pr_debug("tx_data: #5 new_tx_marker"
1646 " %u, size %u\n", *tx_marker, size);
1647 }
1648 }
1649
1650 data += (tx_marker_iov * (MARKER_SIZE / 2));
1651
1652 iov_p = &iov[0];
1653 iov_len = iov_count;
1654
1655 if (iov_count > count->ss_iov_count) {
1656 pr_err("iov_count: %d, count->ss_iov_count:"
1657 " %d\n", iov_count, count->ss_iov_count);
1658 return -1;
1659 }
1660 if (tx_marker_iov > count->ss_marker_count) {
1661 pr_err("tx_marker_iov: %d, count->ss_marker"
1662 "_count: %d\n", tx_marker_iov,
1663 count->ss_marker_count);
1664 return -1;
1665 }
1666 } else {
1667 iov_p = count->iov;
1668 iov_len = count->iov_count;
1669 }
1670
1671 while (total_tx < data) {
1672 tx_loop = kernel_sendmsg(conn->sock, &msg, iov_p, iov_len,
1673 (data - total_tx));
1674 if (tx_loop <= 0) {
1675 pr_debug("tx_loop: %d total_tx %d\n",
1676 tx_loop, total_tx);
1677 return tx_loop;
1678 }
1679 total_tx += tx_loop;
1680 pr_debug("tx_loop: %d, total_tx: %d, data: %d\n",
1681 tx_loop, total_tx, data);
1682 }
1683
1684 if (count->sync_and_steering)
1685 total_tx -= (tx_marker_iov * (MARKER_SIZE / 2));
1686
1687 return total_tx;
1688}
1689
1690int rx_data(
1691 struct iscsi_conn *conn,
1692 struct kvec *iov,
1693 int iov_count,
1694 int data)
1695{
1696 struct iscsi_data_count c;
1697
1698 if (!conn || !conn->sock || !conn->conn_ops)
1699 return -1;
1700
1701 memset(&c, 0, sizeof(struct iscsi_data_count));
1702 c.iov = iov;
1703 c.iov_count = iov_count;
1704 c.data_length = data;
1705 c.type = ISCSI_RX_DATA;
1706
1707 if (conn->conn_ops->OFMarker &&
1708 (conn->conn_state >= TARG_CONN_STATE_LOGGED_IN)) {
1709 if (iscsit_determine_sync_and_steering_counts(conn, &c) < 0)
1710 return -1;
1711 }
1712
1713 return iscsit_do_rx_data(conn, &c);
1714}
1715
1716int tx_data(
1717 struct iscsi_conn *conn,
1718 struct kvec *iov,
1719 int iov_count,
1720 int data)
1721{
1722 struct iscsi_data_count c;
1723
1724 if (!conn || !conn->sock || !conn->conn_ops)
1725 return -1;
1726
1727 memset(&c, 0, sizeof(struct iscsi_data_count));
1728 c.iov = iov;
1729 c.iov_count = iov_count;
1730 c.data_length = data;
1731 c.type = ISCSI_TX_DATA;
1732
1733 if (conn->conn_ops->IFMarker &&
1734 (conn->conn_state >= TARG_CONN_STATE_LOGGED_IN)) {
1735 if (iscsit_determine_sync_and_steering_counts(conn, &c) < 0)
1736 return -1;
1737 }
1738
1739 return iscsit_do_tx_data(conn, &c);
1740}
1741
1742void iscsit_collect_login_stats(
1743 struct iscsi_conn *conn,
1744 u8 status_class,
1745 u8 status_detail)
1746{
1747 struct iscsi_param *intrname = NULL;
1748 struct iscsi_tiqn *tiqn;
1749 struct iscsi_login_stats *ls;
1750
1751 tiqn = iscsit_snmp_get_tiqn(conn);
1752 if (!tiqn)
1753 return;
1754
1755 ls = &tiqn->login_stats;
1756
1757 spin_lock(&ls->lock);
1758 if (!strcmp(conn->login_ip, ls->last_intr_fail_ip_addr) &&
1759 ((get_jiffies_64() - ls->last_fail_time) < 10)) {
1760 /* We already have the failure info for this login */
1761 spin_unlock(&ls->lock);
1762 return;
1763 }
1764
1765 if (status_class == ISCSI_STATUS_CLS_SUCCESS)
1766 ls->accepts++;
1767 else if (status_class == ISCSI_STATUS_CLS_REDIRECT) {
1768 ls->redirects++;
1769 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT;
1770 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1771 (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) {
1772 ls->authenticate_fails++;
1773 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE;
1774 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1775 (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) {
1776 ls->authorize_fails++;
1777 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE;
1778 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1779 (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) {
1780 ls->negotiate_fails++;
1781 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE;
1782 } else {
1783 ls->other_fails++;
1784 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER;
1785 }
1786
1787 /* Save initiator name, ip address and time, if it is a failed login */
1788 if (status_class != ISCSI_STATUS_CLS_SUCCESS) {
1789 if (conn->param_list)
1790 intrname = iscsi_find_param_from_key(INITIATORNAME,
1791 conn->param_list);
1792 strcpy(ls->last_intr_fail_name,
1793 (intrname ? intrname->value : "Unknown"));
1794
1795 ls->last_intr_fail_ip_family = conn->sock->sk->sk_family;
1796 snprintf(ls->last_intr_fail_ip_addr, IPV6_ADDRESS_SPACE,
1797 "%s", conn->login_ip);
1798 ls->last_fail_time = get_jiffies_64();
1799 }
1800
1801 spin_unlock(&ls->lock);
1802}
1803
1804struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn)
1805{
1806 struct iscsi_portal_group *tpg;
1807
1808 if (!conn || !conn->sess)
1809 return NULL;
1810
1811 tpg = conn->sess->tpg;
1812 if (!tpg)
1813 return NULL;
1814
1815 if (!tpg->tpg_tiqn)
1816 return NULL;
1817
1818 return tpg->tpg_tiqn;
1819}
kernel source for telekom puls (alcatel/mediatek)