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target: fix return code of core_tpg_.*_lun
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / target / iscsi / iscsi_target_util.c
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e48354ce
NB		 1/*******************************************************************************
2 * This file contains the iSCSI Target specific utility functions.
3 *
4 * \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
5 *
6 * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
7 *
8 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 ******************************************************************************/
20
21#include <linux/list.h>
22#include <scsi/scsi_tcq.h>
23#include <scsi/iscsi_proto.h>
24#include <target/target_core_base.h>
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;
232 u8 tcm_function;
233
234 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
235 if (!cmd)
236 return NULL;
237
238 cmd->data_direction = DMA_NONE;
239
240 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
241 if (!cmd->tmr_req) {
242 pr_err("Unable to allocate memory for"
243 " Task Management command!\n");
ba773669 244 goto out;
e48354ce
NB		 245 }
246 /*
247 * TASK_REASSIGN for ERL=2 / connection stays inside of
248 * LIO-Target $FABRIC_MOD
249 */
250 if (function == ISCSI_TM_FUNC_TASK_REASSIGN)
251 return cmd;
252
253 se_cmd = &cmd->se_cmd;
254 /*
255 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
256 */
257 transport_init_se_cmd(se_cmd, &lio_target_fabric_configfs->tf_ops,
258 conn->sess->se_sess, 0, DMA_NONE,
259 MSG_SIMPLE_TAG, &cmd->sense_buffer[0]);
260
261 switch (function) {
262 case ISCSI_TM_FUNC_ABORT_TASK:
263 tcm_function = TMR_ABORT_TASK;
264 break;
265 case ISCSI_TM_FUNC_ABORT_TASK_SET:
266 tcm_function = TMR_ABORT_TASK_SET;
267 break;
268 case ISCSI_TM_FUNC_CLEAR_ACA:
269 tcm_function = TMR_CLEAR_ACA;
270 break;
271 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
272 tcm_function = TMR_CLEAR_TASK_SET;
273 break;
274 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
275 tcm_function = TMR_LUN_RESET;
276 break;
277 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
278 tcm_function = TMR_TARGET_WARM_RESET;
279 break;
280 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
281 tcm_function = TMR_TARGET_COLD_RESET;
282 break;
283 default:
284 pr_err("Unknown iSCSI TMR Function:"
285 " 0x%02x\n", function);
286 goto out;
287 }
288
289 se_cmd->se_tmr_req = core_tmr_alloc_req(se_cmd,
8359cf43 290 cmd->tmr_req, tcm_function,
dd503a5f 291 GFP_KERNEL);
e48354ce
NB		 292 if (!se_cmd->se_tmr_req)
293 goto out;
294
295 cmd->tmr_req->se_tmr_req = se_cmd->se_tmr_req;
296
297 return cmd;
298out:
299 iscsit_release_cmd(cmd);
e48354ce
NB		 300 return NULL;
301}
302
303int iscsit_decide_list_to_build(
304 struct iscsi_cmd *cmd,
305 u32 immediate_data_length)
306{
307 struct iscsi_build_list bl;
308 struct iscsi_conn *conn = cmd->conn;
309 struct iscsi_session *sess = conn->sess;
310 struct iscsi_node_attrib *na;
311
312 if (sess->sess_ops->DataSequenceInOrder &&
313 sess->sess_ops->DataPDUInOrder)
314 return 0;
315
316 if (cmd->data_direction == DMA_NONE)
317 return 0;
318
319 na = iscsit_tpg_get_node_attrib(sess);
320 memset(&bl, 0, sizeof(struct iscsi_build_list));
321
322 if (cmd->data_direction == DMA_FROM_DEVICE) {
323 bl.data_direction = ISCSI_PDU_READ;
324 bl.type = PDULIST_NORMAL;
325 if (na->random_datain_pdu_offsets)
326 bl.randomize |= RANDOM_DATAIN_PDU_OFFSETS;
327 if (na->random_datain_seq_offsets)
328 bl.randomize |= RANDOM_DATAIN_SEQ_OFFSETS;
329 } else {
330 bl.data_direction = ISCSI_PDU_WRITE;
331 bl.immediate_data_length = immediate_data_length;
332 if (na->random_r2t_offsets)
333 bl.randomize |= RANDOM_R2T_OFFSETS;
334
335 if (!cmd->immediate_data && !cmd->unsolicited_data)
336 bl.type = PDULIST_NORMAL;
337 else if (cmd->immediate_data && !cmd->unsolicited_data)
338 bl.type = PDULIST_IMMEDIATE;
339 else if (!cmd->immediate_data && cmd->unsolicited_data)
340 bl.type = PDULIST_UNSOLICITED;
341 else if (cmd->immediate_data && cmd->unsolicited_data)
342 bl.type = PDULIST_IMMEDIATE_AND_UNSOLICITED;
343 }
344
345 return iscsit_do_build_list(cmd, &bl);
346}
347
348struct iscsi_seq *iscsit_get_seq_holder_for_datain(
349 struct iscsi_cmd *cmd,
350 u32 seq_send_order)
351{
352 u32 i;
353
354 for (i = 0; i < cmd->seq_count; i++)
355 if (cmd->seq_list[i].seq_send_order == seq_send_order)
356 return &cmd->seq_list[i];
357
358 return NULL;
359}
360
361struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsi_cmd *cmd)
362{
363 u32 i;
364
365 if (!cmd->seq_list) {
366 pr_err("struct iscsi_cmd->seq_list is NULL!\n");
367 return NULL;
368 }
369
370 for (i = 0; i < cmd->seq_count; i++) {
371 if (cmd->seq_list[i].type != SEQTYPE_NORMAL)
372 continue;
373 if (cmd->seq_list[i].seq_send_order == cmd->seq_send_order) {
374 cmd->seq_send_order++;
375 return &cmd->seq_list[i];
376 }
377 }
378
379 return NULL;
380}
381
382struct iscsi_r2t *iscsit_get_holder_for_r2tsn(
383 struct iscsi_cmd *cmd,
384 u32 r2t_sn)
385{
386 struct iscsi_r2t *r2t;
387
388 spin_lock_bh(&cmd->r2t_lock);
389 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
390 if (r2t->r2t_sn == r2t_sn) {
391 spin_unlock_bh(&cmd->r2t_lock);
392 return r2t;
393 }
394 }
395 spin_unlock_bh(&cmd->r2t_lock);
396
397 return NULL;
398}
399
400static inline int iscsit_check_received_cmdsn(struct iscsi_session *sess, u32 cmdsn)
401{
402 int ret;
403
404 /*
405 * This is the proper method of checking received CmdSN against
406 * ExpCmdSN and MaxCmdSN values, as well as accounting for out
407 * or order CmdSNs due to multiple connection sessions and/or
408 * CRC failures.
409 */
410 if (iscsi_sna_gt(cmdsn, sess->max_cmd_sn)) {
411 pr_err("Received CmdSN: 0x%08x is greater than"
412 " MaxCmdSN: 0x%08x, protocol error.\n", cmdsn,
413 sess->max_cmd_sn);
414 ret = CMDSN_ERROR_CANNOT_RECOVER;
415
416 } else if (cmdsn == sess->exp_cmd_sn) {
417 sess->exp_cmd_sn++;
418 pr_debug("Received CmdSN matches ExpCmdSN,"
419 " incremented ExpCmdSN to: 0x%08x\n",
420 sess->exp_cmd_sn);
421 ret = CMDSN_NORMAL_OPERATION;
422
423 } else if (iscsi_sna_gt(cmdsn, sess->exp_cmd_sn)) {
424 pr_debug("Received CmdSN: 0x%08x is greater"
425 " than ExpCmdSN: 0x%08x, not acknowledging.\n",
426 cmdsn, sess->exp_cmd_sn);
427 ret = CMDSN_HIGHER_THAN_EXP;
428
429 } else {
430 pr_err("Received CmdSN: 0x%08x is less than"
431 " ExpCmdSN: 0x%08x, ignoring.\n", cmdsn,
432 sess->exp_cmd_sn);
433 ret = CMDSN_LOWER_THAN_EXP;
434 }
435
436 return ret;
437}
438
439/*
440 * Commands may be received out of order if MC/S is in use.
441 * Ensure they are executed in CmdSN order.
442 */
443int iscsit_sequence_cmd(
444 struct iscsi_conn *conn,
445 struct iscsi_cmd *cmd,
446 u32 cmdsn)
447{
448 int ret;
449 int cmdsn_ret;
450
451 mutex_lock(&conn->sess->cmdsn_mutex);
452
453 cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, cmdsn);
454 switch (cmdsn_ret) {
455 case CMDSN_NORMAL_OPERATION:
456 ret = iscsit_execute_cmd(cmd, 0);
457 if ((ret >= 0) && !list_empty(&conn->sess->sess_ooo_cmdsn_list))
458 iscsit_execute_ooo_cmdsns(conn->sess);
459 break;
460 case CMDSN_HIGHER_THAN_EXP:
461 ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, cmdsn);
462 break;
463 case CMDSN_LOWER_THAN_EXP:
464 cmd->i_state = ISTATE_REMOVE;
465 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
466 ret = cmdsn_ret;
467 break;
468 default:
469 ret = cmdsn_ret;
470 break;
471 }
472 mutex_unlock(&conn->sess->cmdsn_mutex);
473
474 return ret;
475}
476
477int iscsit_check_unsolicited_dataout(struct iscsi_cmd *cmd, unsigned char *buf)
478{
479 struct iscsi_conn *conn = cmd->conn;
480 struct se_cmd *se_cmd = &cmd->se_cmd;
481 struct iscsi_data *hdr = (struct iscsi_data *) buf;
482 u32 payload_length = ntoh24(hdr->dlength);
483
484 if (conn->sess->sess_ops->InitialR2T) {
485 pr_err("Received unexpected unsolicited data"
486 " while InitialR2T=Yes, protocol error.\n");
487 transport_send_check_condition_and_sense(se_cmd,
488 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
489 return -1;
490 }
491
492 if ((cmd->first_burst_len + payload_length) >
493 conn->sess->sess_ops->FirstBurstLength) {
494 pr_err("Total %u bytes exceeds FirstBurstLength: %u"
495 " for this Unsolicited DataOut Burst.\n",
496 (cmd->first_burst_len + payload_length),
497 conn->sess->sess_ops->FirstBurstLength);
498 transport_send_check_condition_and_sense(se_cmd,
499 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
500 return -1;
501 }
502
503 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))
504 return 0;
505
506 if (((cmd->first_burst_len + payload_length) != cmd->data_length) &&
507 ((cmd->first_burst_len + payload_length) !=
508 conn->sess->sess_ops->FirstBurstLength)) {
509 pr_err("Unsolicited non-immediate data received %u"
510 " does not equal FirstBurstLength: %u, and does"
511 " not equal ExpXferLen %u.\n",
512 (cmd->first_burst_len + payload_length),
513 conn->sess->sess_ops->FirstBurstLength, cmd->data_length);
514 transport_send_check_condition_and_sense(se_cmd,
515 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
516 return -1;
517 }
518 return 0;
519}
520
521struct iscsi_cmd *iscsit_find_cmd_from_itt(
522 struct iscsi_conn *conn,
523 u32 init_task_tag)
524{
525 struct iscsi_cmd *cmd;
526
527 spin_lock_bh(&conn->cmd_lock);
528 list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
529 if (cmd->init_task_tag == init_task_tag) {
530 spin_unlock_bh(&conn->cmd_lock);
531 return cmd;
532 }
533 }
534 spin_unlock_bh(&conn->cmd_lock);
535
536 pr_err("Unable to locate ITT: 0x%08x on CID: %hu",
537 init_task_tag, conn->cid);
538 return NULL;
539}
540
541struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump(
542 struct iscsi_conn *conn,
543 u32 init_task_tag,
544 u32 length)
545{
546 struct iscsi_cmd *cmd;
547
548 spin_lock_bh(&conn->cmd_lock);
549 list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
550 if (cmd->init_task_tag == init_task_tag) {
551 spin_unlock_bh(&conn->cmd_lock);
552 return cmd;
553 }
554 }
555 spin_unlock_bh(&conn->cmd_lock);
556
557 pr_err("Unable to locate ITT: 0x%08x on CID: %hu,"
558 " dumping payload\n", init_task_tag, conn->cid);
559 if (length)
560 iscsit_dump_data_payload(conn, length, 1);
561
562 return NULL;
563}
564
565struct iscsi_cmd *iscsit_find_cmd_from_ttt(
566 struct iscsi_conn *conn,
567 u32 targ_xfer_tag)
568{
569 struct iscsi_cmd *cmd = NULL;
570
571 spin_lock_bh(&conn->cmd_lock);
572 list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
573 if (cmd->targ_xfer_tag == targ_xfer_tag) {
574 spin_unlock_bh(&conn->cmd_lock);
575 return cmd;
576 }
577 }
578 spin_unlock_bh(&conn->cmd_lock);
579
580 pr_err("Unable to locate TTT: 0x%08x on CID: %hu\n",
581 targ_xfer_tag, conn->cid);
582 return NULL;
583}
584
585int iscsit_find_cmd_for_recovery(
586 struct iscsi_session *sess,
587 struct iscsi_cmd **cmd_ptr,
588 struct iscsi_conn_recovery **cr_ptr,
589 u32 init_task_tag)
590{
591 struct iscsi_cmd *cmd = NULL;
592 struct iscsi_conn_recovery *cr;
593 /*
594 * Scan through the inactive connection recovery list's command list.
595 * If init_task_tag matches the command is still alligent.
596 */
597 spin_lock(&sess->cr_i_lock);
598 list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) {
599 spin_lock(&cr->conn_recovery_cmd_lock);
600 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_list) {
601 if (cmd->init_task_tag == init_task_tag) {
602 spin_unlock(&cr->conn_recovery_cmd_lock);
603 spin_unlock(&sess->cr_i_lock);
604
605 *cr_ptr = cr;
606 *cmd_ptr = cmd;
607 return -2;
608 }
609 }
610 spin_unlock(&cr->conn_recovery_cmd_lock);
611 }
612 spin_unlock(&sess->cr_i_lock);
613 /*
614 * Scan through the active connection recovery list's command list.
615 * If init_task_tag matches the command is ready to be reassigned.
616 */
617 spin_lock(&sess->cr_a_lock);
618 list_for_each_entry(cr, &sess->cr_active_list, cr_list) {
619 spin_lock(&cr->conn_recovery_cmd_lock);
620 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_list) {
621 if (cmd->init_task_tag == init_task_tag) {
622 spin_unlock(&cr->conn_recovery_cmd_lock);
623 spin_unlock(&sess->cr_a_lock);
624
625 *cr_ptr = cr;
626 *cmd_ptr = cmd;
627 return 0;
628 }
629 }
630 spin_unlock(&cr->conn_recovery_cmd_lock);
631 }
632 spin_unlock(&sess->cr_a_lock);
633
634 return -1;
635}
636
637void iscsit_add_cmd_to_immediate_queue(
638 struct iscsi_cmd *cmd,
639 struct iscsi_conn *conn,
640 u8 state)
641{
642 struct iscsi_queue_req *qr;
643
644 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
645 if (!qr) {
646 pr_err("Unable to allocate memory for"
647 " struct iscsi_queue_req\n");
648 return;
649 }
650 INIT_LIST_HEAD(&qr->qr_list);
651 qr->cmd = cmd;
652 qr->state = state;
653
654 spin_lock_bh(&conn->immed_queue_lock);
655 list_add_tail(&qr->qr_list, &conn->immed_queue_list);
656 atomic_inc(&cmd->immed_queue_count);
657 atomic_set(&conn->check_immediate_queue, 1);
658 spin_unlock_bh(&conn->immed_queue_lock);
659
660 wake_up_process(conn->thread_set->tx_thread);
661}
662
663struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *conn)
664{
665 struct iscsi_queue_req *qr;
666
667 spin_lock_bh(&conn->immed_queue_lock);
668 if (list_empty(&conn->immed_queue_list)) {
669 spin_unlock_bh(&conn->immed_queue_lock);
670 return NULL;
671 }
672 list_for_each_entry(qr, &conn->immed_queue_list, qr_list)
673 break;
674
675 list_del(&qr->qr_list);
676 if (qr->cmd)
677 atomic_dec(&qr->cmd->immed_queue_count);
678 spin_unlock_bh(&conn->immed_queue_lock);
679
680 return qr;
681}
682
683static void iscsit_remove_cmd_from_immediate_queue(
684 struct iscsi_cmd *cmd,
685 struct iscsi_conn *conn)
686{
687 struct iscsi_queue_req *qr, *qr_tmp;
688
689 spin_lock_bh(&conn->immed_queue_lock);
690 if (!atomic_read(&cmd->immed_queue_count)) {
691 spin_unlock_bh(&conn->immed_queue_lock);
692 return;
693 }
694
695 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
696 if (qr->cmd != cmd)
697 continue;
698
699 atomic_dec(&qr->cmd->immed_queue_count);
700 list_del(&qr->qr_list);
701 kmem_cache_free(lio_qr_cache, qr);
702 }
703 spin_unlock_bh(&conn->immed_queue_lock);
704
705 if (atomic_read(&cmd->immed_queue_count)) {
706 pr_err("ITT: 0x%08x immed_queue_count: %d\n",
707 cmd->init_task_tag,
708 atomic_read(&cmd->immed_queue_count));
709 }
710}
711
712void iscsit_add_cmd_to_response_queue(
713 struct iscsi_cmd *cmd,
714 struct iscsi_conn *conn,
715 u8 state)
716{
717 struct iscsi_queue_req *qr;
718
719 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
720 if (!qr) {
721 pr_err("Unable to allocate memory for"
722 " struct iscsi_queue_req\n");
723 return;
724 }
725 INIT_LIST_HEAD(&qr->qr_list);
726 qr->cmd = cmd;
727 qr->state = state;
728
729 spin_lock_bh(&conn->response_queue_lock);
730 list_add_tail(&qr->qr_list, &conn->response_queue_list);
731 atomic_inc(&cmd->response_queue_count);
732 spin_unlock_bh(&conn->response_queue_lock);
733
734 wake_up_process(conn->thread_set->tx_thread);
735}
736
737struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *conn)
738{
739 struct iscsi_queue_req *qr;
740
741 spin_lock_bh(&conn->response_queue_lock);
742 if (list_empty(&conn->response_queue_list)) {
743 spin_unlock_bh(&conn->response_queue_lock);
744 return NULL;
745 }
746
747 list_for_each_entry(qr, &conn->response_queue_list, qr_list)
748 break;
749
750 list_del(&qr->qr_list);
751 if (qr->cmd)
752 atomic_dec(&qr->cmd->response_queue_count);
753 spin_unlock_bh(&conn->response_queue_lock);
754
755 return qr;
756}
757
758static void iscsit_remove_cmd_from_response_queue(
759 struct iscsi_cmd *cmd,
760 struct iscsi_conn *conn)
761{
762 struct iscsi_queue_req *qr, *qr_tmp;
763
764 spin_lock_bh(&conn->response_queue_lock);
765 if (!atomic_read(&cmd->response_queue_count)) {
766 spin_unlock_bh(&conn->response_queue_lock);
767 return;
768 }
769
770 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
771 qr_list) {
772 if (qr->cmd != cmd)
773 continue;
774
775 atomic_dec(&qr->cmd->response_queue_count);
776 list_del(&qr->qr_list);
777 kmem_cache_free(lio_qr_cache, qr);
778 }
779 spin_unlock_bh(&conn->response_queue_lock);
780
781 if (atomic_read(&cmd->response_queue_count)) {
782 pr_err("ITT: 0x%08x response_queue_count: %d\n",
783 cmd->init_task_tag,
784 atomic_read(&cmd->response_queue_count));
785 }
786}
787
788void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn)
789{
790 struct iscsi_queue_req *qr, *qr_tmp;
791
792 spin_lock_bh(&conn->immed_queue_lock);
793 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
794 list_del(&qr->qr_list);
795 if (qr->cmd)
796 atomic_dec(&qr->cmd->immed_queue_count);
797
798 kmem_cache_free(lio_qr_cache, qr);
799 }
800 spin_unlock_bh(&conn->immed_queue_lock);
801
802 spin_lock_bh(&conn->response_queue_lock);
803 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
804 qr_list) {
805 list_del(&qr->qr_list);
806 if (qr->cmd)
807 atomic_dec(&qr->cmd->response_queue_count);
808
809 kmem_cache_free(lio_qr_cache, qr);
810 }
811 spin_unlock_bh(&conn->response_queue_lock);
812}
813
814void iscsit_release_cmd(struct iscsi_cmd *cmd)
815{
816 struct iscsi_conn *conn = cmd->conn;
817 int i;
818
819 iscsit_free_r2ts_from_list(cmd);
820 iscsit_free_all_datain_reqs(cmd);
821
822 kfree(cmd->buf_ptr);
823 kfree(cmd->pdu_list);
824 kfree(cmd->seq_list);
825 kfree(cmd->tmr_req);
826 kfree(cmd->iov_data);
827
828 for (i = 0; i < cmd->t_mem_sg_nents; i++)
829 __free_page(sg_page(&cmd->t_mem_sg[i]));
830
831 kfree(cmd->t_mem_sg);
832
833 if (conn) {
834 iscsit_remove_cmd_from_immediate_queue(cmd, conn);
835 iscsit_remove_cmd_from_response_queue(cmd, conn);
836 }
837
838 kmem_cache_free(lio_cmd_cache, cmd);
839}
840
d270190a
NB		 841void iscsit_free_cmd(struct iscsi_cmd *cmd)
842{
843 /*
844 * Determine if a struct se_cmd is assoicated with
845 * this struct iscsi_cmd.
846 */
847 switch (cmd->iscsi_opcode) {
848 case ISCSI_OP_SCSI_CMD:
849 case ISCSI_OP_SCSI_TMFUNC:
850 transport_generic_free_cmd(&cmd->se_cmd, 1);
851 break;
852 default:
853 iscsit_release_cmd(cmd);
854 break;
855 }
856}
857
e48354ce
NB		 858int iscsit_check_session_usage_count(struct iscsi_session *sess)
859{
860 spin_lock_bh(&sess->session_usage_lock);
861 if (sess->session_usage_count != 0) {
862 sess->session_waiting_on_uc = 1;
863 spin_unlock_bh(&sess->session_usage_lock);
864 if (in_interrupt())
865 return 2;
866
867 wait_for_completion(&sess->session_waiting_on_uc_comp);
868 return 1;
869 }
870 spin_unlock_bh(&sess->session_usage_lock);
871
872 return 0;
873}
874
875void iscsit_dec_session_usage_count(struct iscsi_session *sess)
876{
877 spin_lock_bh(&sess->session_usage_lock);
878 sess->session_usage_count--;
879
880 if (!sess->session_usage_count && sess->session_waiting_on_uc)
881 complete(&sess->session_waiting_on_uc_comp);
882
883 spin_unlock_bh(&sess->session_usage_lock);
884}
885
886void iscsit_inc_session_usage_count(struct iscsi_session *sess)
887{
888 spin_lock_bh(&sess->session_usage_lock);
889 sess->session_usage_count++;
890 spin_unlock_bh(&sess->session_usage_lock);
891}
892
e48354ce
NB		 893/*
894 * Setup conn->if_marker and conn->of_marker values based upon
895 * the initial marker-less interval. (see iSCSI v19 A.2)
896 */
897int iscsit_set_sync_and_steering_values(struct iscsi_conn *conn)
898{
899 int login_ifmarker_count = 0, login_ofmarker_count = 0, next_marker = 0;
900 /*
901 * IFMarkInt and OFMarkInt are negotiated as 32-bit words.
902 */
903 u32 IFMarkInt = (conn->conn_ops->IFMarkInt * 4);
904 u32 OFMarkInt = (conn->conn_ops->OFMarkInt * 4);
905
906 if (conn->conn_ops->OFMarker) {
907 /*
908 * Account for the first Login Command received not
909 * via iscsi_recv_msg().
910 */
911 conn->of_marker += ISCSI_HDR_LEN;
912 if (conn->of_marker <= OFMarkInt) {
913 conn->of_marker = (OFMarkInt - conn->of_marker);
914 } else {
915 login_ofmarker_count = (conn->of_marker / OFMarkInt);
916 next_marker = (OFMarkInt * (login_ofmarker_count + 1)) +
917 (login_ofmarker_count * MARKER_SIZE);
918 conn->of_marker = (next_marker - conn->of_marker);
919 }
920 conn->of_marker_offset = 0;
921 pr_debug("Setting OFMarker value to %u based on Initial"
922 " Markerless Interval.\n", conn->of_marker);
923 }
924
925 if (conn->conn_ops->IFMarker) {
926 if (conn->if_marker <= IFMarkInt) {
927 conn->if_marker = (IFMarkInt - conn->if_marker);
928 } else {
929 login_ifmarker_count = (conn->if_marker / IFMarkInt);
930 next_marker = (IFMarkInt * (login_ifmarker_count + 1)) +
931 (login_ifmarker_count * MARKER_SIZE);
932 conn->if_marker = (next_marker - conn->if_marker);
933 }
934 pr_debug("Setting IFMarker value to %u based on Initial"
935 " Markerless Interval.\n", conn->if_marker);
936 }
937
938 return 0;
939}
940
941struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid)
942{
943 struct iscsi_conn *conn;
944
945 spin_lock_bh(&sess->conn_lock);
946 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
947 if ((conn->cid == cid) &&
948 (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) {
949 iscsit_inc_conn_usage_count(conn);
950 spin_unlock_bh(&sess->conn_lock);
951 return conn;
952 }
953 }
954 spin_unlock_bh(&sess->conn_lock);
955
956 return NULL;
957}
958
959struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid)
960{
961 struct iscsi_conn *conn;
962
963 spin_lock_bh(&sess->conn_lock);
964 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
965 if (conn->cid == cid) {
966 iscsit_inc_conn_usage_count(conn);
967 spin_lock(&conn->state_lock);
968 atomic_set(&conn->connection_wait_rcfr, 1);
969 spin_unlock(&conn->state_lock);
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
979void iscsit_check_conn_usage_count(struct iscsi_conn *conn)
980{
981 spin_lock_bh(&conn->conn_usage_lock);
982 if (conn->conn_usage_count != 0) {
983 conn->conn_waiting_on_uc = 1;
984 spin_unlock_bh(&conn->conn_usage_lock);
985
986 wait_for_completion(&conn->conn_waiting_on_uc_comp);
987 return;
988 }
989 spin_unlock_bh(&conn->conn_usage_lock);
990}
991
992void iscsit_dec_conn_usage_count(struct iscsi_conn *conn)
993{
994 spin_lock_bh(&conn->conn_usage_lock);
995 conn->conn_usage_count--;
996
997 if (!conn->conn_usage_count && conn->conn_waiting_on_uc)
998 complete(&conn->conn_waiting_on_uc_comp);
999
1000 spin_unlock_bh(&conn->conn_usage_lock);
1001}
1002
1003void iscsit_inc_conn_usage_count(struct iscsi_conn *conn)
1004{
1005 spin_lock_bh(&conn->conn_usage_lock);
1006 conn->conn_usage_count++;
1007 spin_unlock_bh(&conn->conn_usage_lock);
1008}
1009
1010static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response)
1011{
1012 u8 state;
1013 struct iscsi_cmd *cmd;
1014
1015 cmd = iscsit_allocate_cmd(conn, GFP_ATOMIC);
1016 if (!cmd)
1017 return -1;
1018
1019 cmd->iscsi_opcode = ISCSI_OP_NOOP_IN;
1020 state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE :
1021 ISTATE_SEND_NOPIN_NO_RESPONSE;
1022 cmd->init_task_tag = 0xFFFFFFFF;
1023 spin_lock_bh(&conn->sess->ttt_lock);
1024 cmd->targ_xfer_tag = (want_response) ? conn->sess->targ_xfer_tag++ :
1025 0xFFFFFFFF;
1026 if (want_response && (cmd->targ_xfer_tag == 0xFFFFFFFF))
1027 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
1028 spin_unlock_bh(&conn->sess->ttt_lock);
1029
1030 spin_lock_bh(&conn->cmd_lock);
1031 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1032 spin_unlock_bh(&conn->cmd_lock);
1033
1034 if (want_response)
1035 iscsit_start_nopin_response_timer(conn);
1036 iscsit_add_cmd_to_immediate_queue(cmd, conn, state);
1037
1038 return 0;
1039}
1040
1041static void iscsit_handle_nopin_response_timeout(unsigned long data)
1042{
1043 struct iscsi_conn *conn = (struct iscsi_conn *) data;
1044
1045 iscsit_inc_conn_usage_count(conn);
1046
1047 spin_lock_bh(&conn->nopin_timer_lock);
1048 if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) {
1049 spin_unlock_bh(&conn->nopin_timer_lock);
1050 iscsit_dec_conn_usage_count(conn);
1051 return;
1052 }
1053
1054 pr_debug("Did not receive response to NOPIN on CID: %hu on"
1055 " SID: %u, failing connection.\n", conn->cid,
1056 conn->sess->sid);
1057 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
1058 spin_unlock_bh(&conn->nopin_timer_lock);
1059
1060 {
1061 struct iscsi_portal_group *tpg = conn->sess->tpg;
1062 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
1063
1064 if (tiqn) {
1065 spin_lock_bh(&tiqn->sess_err_stats.lock);
1066 strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
8359cf43 1067 conn->sess->sess_ops->InitiatorName);
e48354ce
NB		 1068 tiqn->sess_err_stats.last_sess_failure_type =
1069 ISCSI_SESS_ERR_CXN_TIMEOUT;
1070 tiqn->sess_err_stats.cxn_timeout_errors++;
1071 conn->sess->conn_timeout_errors++;
1072 spin_unlock_bh(&tiqn->sess_err_stats.lock);
1073 }
1074 }
1075
1076 iscsit_cause_connection_reinstatement(conn, 0);
1077 iscsit_dec_conn_usage_count(conn);
1078}
1079
1080void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn)
1081{
1082 struct iscsi_session *sess = conn->sess;
1083 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1084
1085 spin_lock_bh(&conn->nopin_timer_lock);
1086 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
1087 spin_unlock_bh(&conn->nopin_timer_lock);
1088 return;
1089 }
1090
1091 mod_timer(&conn->nopin_response_timer,
1092 (get_jiffies_64() + na->nopin_response_timeout * HZ));
1093 spin_unlock_bh(&conn->nopin_timer_lock);
1094}
1095
1096/*
1097 * Called with conn->nopin_timer_lock held.
1098 */
1099void iscsit_start_nopin_response_timer(struct iscsi_conn *conn)
1100{
1101 struct iscsi_session *sess = conn->sess;
1102 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1103
1104 spin_lock_bh(&conn->nopin_timer_lock);
1105 if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) {
1106 spin_unlock_bh(&conn->nopin_timer_lock);
1107 return;
1108 }
1109
1110 init_timer(&conn->nopin_response_timer);
1111 conn->nopin_response_timer.expires =
1112 (get_jiffies_64() + na->nopin_response_timeout * HZ);
1113 conn->nopin_response_timer.data = (unsigned long)conn;
1114 conn->nopin_response_timer.function = iscsit_handle_nopin_response_timeout;
1115 conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP;
1116 conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING;
1117 add_timer(&conn->nopin_response_timer);
1118
1119 pr_debug("Started NOPIN Response Timer on CID: %d to %u"
1120 " seconds\n", conn->cid, na->nopin_response_timeout);
1121 spin_unlock_bh(&conn->nopin_timer_lock);
1122}
1123
1124void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn)
1125{
1126 spin_lock_bh(&conn->nopin_timer_lock);
1127 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
1128 spin_unlock_bh(&conn->nopin_timer_lock);
1129 return;
1130 }
1131 conn->nopin_response_timer_flags |= ISCSI_TF_STOP;
1132 spin_unlock_bh(&conn->nopin_timer_lock);
1133
1134 del_timer_sync(&conn->nopin_response_timer);
1135
1136 spin_lock_bh(&conn->nopin_timer_lock);
1137 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
1138 spin_unlock_bh(&conn->nopin_timer_lock);
1139}
1140
1141static void iscsit_handle_nopin_timeout(unsigned long data)
1142{
1143 struct iscsi_conn *conn = (struct iscsi_conn *) data;
1144
1145 iscsit_inc_conn_usage_count(conn);
1146
1147 spin_lock_bh(&conn->nopin_timer_lock);
1148 if (conn->nopin_timer_flags & ISCSI_TF_STOP) {
1149 spin_unlock_bh(&conn->nopin_timer_lock);
1150 iscsit_dec_conn_usage_count(conn);
1151 return;
1152 }
1153 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1154 spin_unlock_bh(&conn->nopin_timer_lock);
1155
1156 iscsit_add_nopin(conn, 1);
1157 iscsit_dec_conn_usage_count(conn);
1158}
1159
1160/*
1161 * Called with conn->nopin_timer_lock held.
1162 */
1163void __iscsit_start_nopin_timer(struct iscsi_conn *conn)
1164{
1165 struct iscsi_session *sess = conn->sess;
1166 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1167 /*
1168 * NOPIN timeout is disabled.
1169 */
1170 if (!na->nopin_timeout)
1171 return;
1172
1173 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING)
1174 return;
1175
1176 init_timer(&conn->nopin_timer);
1177 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1178 conn->nopin_timer.data = (unsigned long)conn;
1179 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1180 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1181 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1182 add_timer(&conn->nopin_timer);
1183
1184 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1185 " interval\n", conn->cid, na->nopin_timeout);
1186}
1187
1188void iscsit_start_nopin_timer(struct iscsi_conn *conn)
1189{
1190 struct iscsi_session *sess = conn->sess;
1191 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1192 /*
1193 * NOPIN timeout is disabled..
1194 */
1195 if (!na->nopin_timeout)
1196 return;
1197
1198 spin_lock_bh(&conn->nopin_timer_lock);
1199 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) {
1200 spin_unlock_bh(&conn->nopin_timer_lock);
1201 return;
1202 }
1203
1204 init_timer(&conn->nopin_timer);
1205 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1206 conn->nopin_timer.data = (unsigned long)conn;
1207 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1208 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1209 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1210 add_timer(&conn->nopin_timer);
1211
1212 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1213 " interval\n", conn->cid, na->nopin_timeout);
1214 spin_unlock_bh(&conn->nopin_timer_lock);
1215}
1216
1217void iscsit_stop_nopin_timer(struct iscsi_conn *conn)
1218{
1219 spin_lock_bh(&conn->nopin_timer_lock);
1220 if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) {
1221 spin_unlock_bh(&conn->nopin_timer_lock);
1222 return;
1223 }
1224 conn->nopin_timer_flags |= ISCSI_TF_STOP;
1225 spin_unlock_bh(&conn->nopin_timer_lock);
1226
1227 del_timer_sync(&conn->nopin_timer);
1228
1229 spin_lock_bh(&conn->nopin_timer_lock);
1230 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1231 spin_unlock_bh(&conn->nopin_timer_lock);
1232}
1233
1234int iscsit_send_tx_data(
1235 struct iscsi_cmd *cmd,
1236 struct iscsi_conn *conn,
1237 int use_misc)
1238{
1239 int tx_sent, tx_size;
1240 u32 iov_count;
1241 struct kvec *iov;
1242
1243send_data:
1244 tx_size = cmd->tx_size;
1245
1246 if (!use_misc) {
1247 iov = &cmd->iov_data[0];
1248 iov_count = cmd->iov_data_count;
1249 } else {
1250 iov = &cmd->iov_misc[0];
1251 iov_count = cmd->iov_misc_count;
1252 }
1253
1254 tx_sent = tx_data(conn, &iov[0], iov_count, tx_size);
1255 if (tx_size != tx_sent) {
1256 if (tx_sent == -EAGAIN) {
1257 pr_err("tx_data() returned -EAGAIN\n");
1258 goto send_data;
1259 } else
1260 return -1;
1261 }
1262 cmd->tx_size = 0;
1263
1264 return 0;
1265}
1266
1267int iscsit_fe_sendpage_sg(
1268 struct iscsi_cmd *cmd,
1269 struct iscsi_conn *conn)
1270{
1271 struct scatterlist *sg = cmd->first_data_sg;
1272 struct kvec iov;
1273 u32 tx_hdr_size, data_len;
1274 u32 offset = cmd->first_data_sg_off;
40b05497 1275 int tx_sent, iov_off;
e48354ce
NB		 1276
1277send_hdr:
1278 tx_hdr_size = ISCSI_HDR_LEN;
1279 if (conn->conn_ops->HeaderDigest)
1280 tx_hdr_size += ISCSI_CRC_LEN;
1281
1282 iov.iov_base = cmd->pdu;
1283 iov.iov_len = tx_hdr_size;
1284
1285 tx_sent = tx_data(conn, &iov, 1, tx_hdr_size);
1286 if (tx_hdr_size != tx_sent) {
1287 if (tx_sent == -EAGAIN) {
1288 pr_err("tx_data() returned -EAGAIN\n");
1289 goto send_hdr;
1290 }
1291 return -1;
1292 }
1293
1294 data_len = cmd->tx_size - tx_hdr_size - cmd->padding;
40b05497
NB		 1295 /*
1296 * Set iov_off used by padding and data digest tx_data() calls below
1297 * in order to determine proper offset into cmd->iov_data[]
1298 */
1299 if (conn->conn_ops->DataDigest) {
e48354ce 1300 data_len -= ISCSI_CRC_LEN;
40b05497
NB		 1301 if (cmd->padding)
1302 iov_off = (cmd->iov_data_count - 2);
1303 else
1304 iov_off = (cmd->iov_data_count - 1);
1305 } else {
1306 iov_off = (cmd->iov_data_count - 1);
1307 }
e48354ce
NB		 1308 /*
1309 * Perform sendpage() for each page in the scatterlist
1310 */
1311 while (data_len) {
1312 u32 space = (sg->length - offset);
1313 u32 sub_len = min_t(u32, data_len, space);
1314send_pg:
1315 tx_sent = conn->sock->ops->sendpage(conn->sock,
1316 sg_page(sg), sg->offset + offset, sub_len, 0);
1317 if (tx_sent != sub_len) {
1318 if (tx_sent == -EAGAIN) {
1319 pr_err("tcp_sendpage() returned"
1320 " -EAGAIN\n");
1321 goto send_pg;
1322 }
1323
1324 pr_err("tcp_sendpage() failure: %d\n",
1325 tx_sent);
1326 return -1;
1327 }
1328
1329 data_len -= sub_len;
1330 offset = 0;
1331 sg = sg_next(sg);
1332 }
1333
1334send_padding:
1335 if (cmd->padding) {
40b05497 1336 struct kvec *iov_p = &cmd->iov_data[iov_off++];
e48354ce
NB		 1337
1338 tx_sent = tx_data(conn, iov_p, 1, cmd->padding);
1339 if (cmd->padding != tx_sent) {
1340 if (tx_sent == -EAGAIN) {
1341 pr_err("tx_data() returned -EAGAIN\n");
1342 goto send_padding;
1343 }
1344 return -1;
1345 }
1346 }
1347
1348send_datacrc:
1349 if (conn->conn_ops->DataDigest) {
40b05497 1350 struct kvec *iov_d = &cmd->iov_data[iov_off];
e48354ce
NB		 1351
1352 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN);
1353 if (ISCSI_CRC_LEN != tx_sent) {
1354 if (tx_sent == -EAGAIN) {
1355 pr_err("tx_data() returned -EAGAIN\n");
1356 goto send_datacrc;
1357 }
1358 return -1;
1359 }
1360 }
1361
1362 return 0;
1363}
1364
1365/*
1366 * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU
1367 * back to the Initiator when an expection condition occurs with the
1368 * errors set in status_class and status_detail.
1369 *
1370 * Parameters: iSCSI Connection, Status Class, Status Detail.
1371 * Returns: 0 on success, -1 on error.
1372 */
1373int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail)
1374{
1375 u8 iscsi_hdr[ISCSI_HDR_LEN];
1376 int err;
1377 struct kvec iov;
1378 struct iscsi_login_rsp *hdr;
1379
1380 iscsit_collect_login_stats(conn, status_class, status_detail);
1381
1382 memset(&iov, 0, sizeof(struct kvec));
1383 memset(&iscsi_hdr, 0x0, ISCSI_HDR_LEN);
1384
1385 hdr = (struct iscsi_login_rsp *)&iscsi_hdr;
1386 hdr->opcode = ISCSI_OP_LOGIN_RSP;
1387 hdr->status_class = status_class;
1388 hdr->status_detail = status_detail;
1389 hdr->itt = cpu_to_be32(conn->login_itt);
1390
1391 iov.iov_base = &iscsi_hdr;
1392 iov.iov_len = ISCSI_HDR_LEN;
1393
1394 PRINT_BUFF(iscsi_hdr, ISCSI_HDR_LEN);
1395
1396 err = tx_data(conn, &iov, 1, ISCSI_HDR_LEN);
1397 if (err != ISCSI_HDR_LEN) {
1398 pr_err("tx_data returned less than expected\n");
1399 return -1;
1400 }
1401
1402 return 0;
1403}
1404
1405void iscsit_print_session_params(struct iscsi_session *sess)
1406{
1407 struct iscsi_conn *conn;
1408
1409 pr_debug("-----------------------------[Session Params for"
1410 " SID: %u]-----------------------------\n", sess->sid);
1411 spin_lock_bh(&sess->conn_lock);
1412 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
1413 iscsi_dump_conn_ops(conn->conn_ops);
1414 spin_unlock_bh(&sess->conn_lock);
1415
1416 iscsi_dump_sess_ops(sess->sess_ops);
1417}
1418
1419static int iscsit_do_rx_data(
1420 struct iscsi_conn *conn,
1421 struct iscsi_data_count *count)
1422{
1423 int data = count->data_length, rx_loop = 0, total_rx = 0, iov_len;
2ff017f5 1424 struct kvec *iov_p;
e48354ce
NB		 1425 struct msghdr msg;
1426
1427 if (!conn || !conn->sock || !conn->conn_ops)
1428 return -1;
1429
1430 memset(&msg, 0, sizeof(struct msghdr));
1431
2ff017f5
NB		 1432 iov_p = count->iov;
1433 iov_len = count->iov_count;
e48354ce
NB		 1434
1435 while (total_rx < data) {
1436 rx_loop = kernel_recvmsg(conn->sock, &msg, iov_p, iov_len,
1437 (data - total_rx), MSG_WAITALL);
1438 if (rx_loop <= 0) {
1439 pr_debug("rx_loop: %d total_rx: %d\n",
1440 rx_loop, total_rx);
1441 return rx_loop;
1442 }
1443 total_rx += rx_loop;
1444 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n",
1445 rx_loop, total_rx, data);
1446 }
1447
e48354ce
NB		 1448 return total_rx;
1449}
1450
1451static int iscsit_do_tx_data(
1452 struct iscsi_conn *conn,
1453 struct iscsi_data_count *count)
1454{
1455 int data = count->data_length, total_tx = 0, tx_loop = 0, iov_len;
2ff017f5 1456 struct kvec *iov_p;
e48354ce
NB		 1457 struct msghdr msg;
1458
1459 if (!conn || !conn->sock || !conn->conn_ops)
1460 return -1;
1461
1462 if (data <= 0) {
1463 pr_err("Data length is: %d\n", data);
1464 return -1;
1465 }
1466
1467 memset(&msg, 0, sizeof(struct msghdr));
1468
2ff017f5
NB		 1469 iov_p = count->iov;
1470 iov_len = count->iov_count;
e48354ce
NB		 1471
1472 while (total_tx < data) {
1473 tx_loop = kernel_sendmsg(conn->sock, &msg, iov_p, iov_len,
1474 (data - total_tx));
1475 if (tx_loop <= 0) {
1476 pr_debug("tx_loop: %d total_tx %d\n",
1477 tx_loop, total_tx);
1478 return tx_loop;
1479 }
1480 total_tx += tx_loop;
1481 pr_debug("tx_loop: %d, total_tx: %d, data: %d\n",
1482 tx_loop, total_tx, data);
1483 }
1484
e48354ce
NB		 1485 return total_tx;
1486}
1487
1488int rx_data(
1489 struct iscsi_conn *conn,
1490 struct kvec *iov,
1491 int iov_count,
1492 int data)
1493{
1494 struct iscsi_data_count c;
1495
1496 if (!conn || !conn->sock || !conn->conn_ops)
1497 return -1;
1498
1499 memset(&c, 0, sizeof(struct iscsi_data_count));
1500 c.iov = iov;
1501 c.iov_count = iov_count;
1502 c.data_length = data;
1503 c.type = ISCSI_RX_DATA;
1504
e48354ce
NB		 1505 return iscsit_do_rx_data(conn, &c);
1506}
1507
1508int tx_data(
1509 struct iscsi_conn *conn,
1510 struct kvec *iov,
1511 int iov_count,
1512 int data)
1513{
1514 struct iscsi_data_count c;
1515
1516 if (!conn || !conn->sock || !conn->conn_ops)
1517 return -1;
1518
1519 memset(&c, 0, sizeof(struct iscsi_data_count));
1520 c.iov = iov;
1521 c.iov_count = iov_count;
1522 c.data_length = data;
1523 c.type = ISCSI_TX_DATA;
1524
e48354ce
NB		 1525 return iscsit_do_tx_data(conn, &c);
1526}
1527
1528void iscsit_collect_login_stats(
1529 struct iscsi_conn *conn,
1530 u8 status_class,
1531 u8 status_detail)
1532{
1533 struct iscsi_param *intrname = NULL;
1534 struct iscsi_tiqn *tiqn;
1535 struct iscsi_login_stats *ls;
1536
1537 tiqn = iscsit_snmp_get_tiqn(conn);
1538 if (!tiqn)
1539 return;
1540
1541 ls = &tiqn->login_stats;
1542
1543 spin_lock(&ls->lock);
1544 if (!strcmp(conn->login_ip, ls->last_intr_fail_ip_addr) &&
1545 ((get_jiffies_64() - ls->last_fail_time) < 10)) {
1546 /* We already have the failure info for this login */
1547 spin_unlock(&ls->lock);
1548 return;
1549 }
1550
1551 if (status_class == ISCSI_STATUS_CLS_SUCCESS)
1552 ls->accepts++;
1553 else if (status_class == ISCSI_STATUS_CLS_REDIRECT) {
1554 ls->redirects++;
1555 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT;
1556 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1557 (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) {
1558 ls->authenticate_fails++;
1559 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE;
1560 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1561 (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) {
1562 ls->authorize_fails++;
1563 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE;
1564 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1565 (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) {
1566 ls->negotiate_fails++;
1567 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE;
1568 } else {
1569 ls->other_fails++;
1570 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER;
1571 }
1572
1573 /* Save initiator name, ip address and time, if it is a failed login */
1574 if (status_class != ISCSI_STATUS_CLS_SUCCESS) {
1575 if (conn->param_list)
1576 intrname = iscsi_find_param_from_key(INITIATORNAME,
1577 conn->param_list);
1578 strcpy(ls->last_intr_fail_name,
1579 (intrname ? intrname->value : "Unknown"));
1580
1581 ls->last_intr_fail_ip_family = conn->sock->sk->sk_family;
1582 snprintf(ls->last_intr_fail_ip_addr, IPV6_ADDRESS_SPACE,
1583 "%s", conn->login_ip);
1584 ls->last_fail_time = get_jiffies_64();
1585 }
1586
1587 spin_unlock(&ls->lock);
1588}
1589
1590struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn)
1591{
1592 struct iscsi_portal_group *tpg;
1593
1594 if (!conn || !conn->sess)
1595 return NULL;
1596
1597 tpg = conn->sess->tpg;
1598 if (!tpg)
1599 return NULL;
1600
1601 if (!tpg->tpg_tiqn)
1602 return NULL;
1603
1604 return tpg->tpg_tiqn;
1605}
kernel source for telekom puls (alcatel/mediatek)