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[mirror_ubuntu-artful-kernel.git] / drivers / target / iscsi / iscsi_target_util.c
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e48354ce
NB		 1/*******************************************************************************
2 * This file contains the iSCSI Target specific utility functions.
3 *
4 * \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
5 *
6 * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
7 *
8 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 ******************************************************************************/
20
21#include <linux/list.h>
22#include <scsi/scsi_tcq.h>
23#include <scsi/iscsi_proto.h>
24#include <target/target_core_base.h>
25#include <target/target_core_transport.h>
26#include <target/target_core_tmr.h>
27#include <target/target_core_fabric_ops.h>
28#include <target/target_core_configfs.h>
29
30#include "iscsi_target_core.h"
31#include "iscsi_target_parameters.h"
32#include "iscsi_target_seq_pdu_list.h"
33#include "iscsi_target_datain_values.h"
34#include "iscsi_target_erl0.h"
35#include "iscsi_target_erl1.h"
36#include "iscsi_target_erl2.h"
37#include "iscsi_target_tpg.h"
38#include "iscsi_target_tq.h"
39#include "iscsi_target_util.h"
40#include "iscsi_target.h"
41
42#define PRINT_BUFF(buff, len) \
43{ \
44 int zzz; \
45 \
46 pr_debug("%d:\n", __LINE__); \
47 for (zzz = 0; zzz < len; zzz++) { \
48 if (zzz % 16 == 0) { \
49 if (zzz) \
50 pr_debug("\n"); \
51 pr_debug("%4i: ", zzz); \
52 } \
53 pr_debug("%02x ", (unsigned char) (buff)[zzz]); \
54 } \
55 if ((len + 1) % 16) \
56 pr_debug("\n"); \
57}
58
59extern struct list_head g_tiqn_list;
60extern spinlock_t tiqn_lock;
61
62/*
63 * Called with cmd->r2t_lock held.
64 */
65int iscsit_add_r2t_to_list(
66 struct iscsi_cmd *cmd,
67 u32 offset,
68 u32 xfer_len,
69 int recovery,
70 u32 r2t_sn)
71{
72 struct iscsi_r2t *r2t;
73
74 r2t = kmem_cache_zalloc(lio_r2t_cache, GFP_ATOMIC);
75 if (!r2t) {
76 pr_err("Unable to allocate memory for struct iscsi_r2t.\n");
77 return -1;
78 }
79 INIT_LIST_HEAD(&r2t->r2t_list);
80
81 r2t->recovery_r2t = recovery;
82 r2t->r2t_sn = (!r2t_sn) ? cmd->r2t_sn++ : r2t_sn;
83 r2t->offset = offset;
84 r2t->xfer_len = xfer_len;
85 list_add_tail(&r2t->r2t_list, &cmd->cmd_r2t_list);
86 spin_unlock_bh(&cmd->r2t_lock);
87
88 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, ISTATE_SEND_R2T);
89
90 spin_lock_bh(&cmd->r2t_lock);
91 return 0;
92}
93
94struct iscsi_r2t *iscsit_get_r2t_for_eos(
95 struct iscsi_cmd *cmd,
96 u32 offset,
97 u32 length)
98{
99 struct iscsi_r2t *r2t;
100
101 spin_lock_bh(&cmd->r2t_lock);
102 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
103 if ((r2t->offset <= offset) &&
104 (r2t->offset + r2t->xfer_len) >= (offset + length)) {
105 spin_unlock_bh(&cmd->r2t_lock);
106 return r2t;
107 }
108 }
109 spin_unlock_bh(&cmd->r2t_lock);
110
111 pr_err("Unable to locate R2T for Offset: %u, Length:"
112 " %u\n", offset, length);
113 return NULL;
114}
115
116struct iscsi_r2t *iscsit_get_r2t_from_list(struct iscsi_cmd *cmd)
117{
118 struct iscsi_r2t *r2t;
119
120 spin_lock_bh(&cmd->r2t_lock);
121 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
122 if (!r2t->sent_r2t) {
123 spin_unlock_bh(&cmd->r2t_lock);
124 return r2t;
125 }
126 }
127 spin_unlock_bh(&cmd->r2t_lock);
128
129 pr_err("Unable to locate next R2T to send for ITT:"
130 " 0x%08x.\n", cmd->init_task_tag);
131 return NULL;
132}
133
134/*
135 * Called with cmd->r2t_lock held.
136 */
137void iscsit_free_r2t(struct iscsi_r2t *r2t, struct iscsi_cmd *cmd)
138{
139 list_del(&r2t->r2t_list);
140 kmem_cache_free(lio_r2t_cache, r2t);
141}
142
143void iscsit_free_r2ts_from_list(struct iscsi_cmd *cmd)
144{
145 struct iscsi_r2t *r2t, *r2t_tmp;
146
147 spin_lock_bh(&cmd->r2t_lock);
148 list_for_each_entry_safe(r2t, r2t_tmp, &cmd->cmd_r2t_list, r2t_list)
149 iscsit_free_r2t(r2t, cmd);
150 spin_unlock_bh(&cmd->r2t_lock);
151}
152
153/*
154 * May be called from software interrupt (timer) context for allocating
155 * iSCSI NopINs.
156 */
157struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *conn, gfp_t gfp_mask)
158{
159 struct iscsi_cmd *cmd;
160
161 cmd = kmem_cache_zalloc(lio_cmd_cache, gfp_mask);
162 if (!cmd) {
163 pr_err("Unable to allocate memory for struct iscsi_cmd.\n");
164 return NULL;
165 }
166
167 cmd->conn = conn;
168 INIT_LIST_HEAD(&cmd->i_list);
169 INIT_LIST_HEAD(&cmd->datain_list);
170 INIT_LIST_HEAD(&cmd->cmd_r2t_list);
171 init_completion(&cmd->reject_comp);
172 spin_lock_init(&cmd->datain_lock);
173 spin_lock_init(&cmd->dataout_timeout_lock);
174 spin_lock_init(&cmd->istate_lock);
175 spin_lock_init(&cmd->error_lock);
176 spin_lock_init(&cmd->r2t_lock);
177
178 return cmd;
179}
180
181/*
182 * Called from iscsi_handle_scsi_cmd()
183 */
184struct iscsi_cmd *iscsit_allocate_se_cmd(
185 struct iscsi_conn *conn,
186 u32 data_length,
187 int data_direction,
188 int iscsi_task_attr)
189{
190 struct iscsi_cmd *cmd;
191 struct se_cmd *se_cmd;
192 int sam_task_attr;
193
194 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
195 if (!cmd)
196 return NULL;
197
198 cmd->data_direction = data_direction;
199 cmd->data_length = data_length;
200 /*
201 * Figure out the SAM Task Attribute for the incoming SCSI CDB
202 */
203 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
204 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
205 sam_task_attr = MSG_SIMPLE_TAG;
206 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
207 sam_task_attr = MSG_ORDERED_TAG;
208 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
209 sam_task_attr = MSG_HEAD_TAG;
210 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
211 sam_task_attr = MSG_ACA_TAG;
212 else {
213 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
214 " MSG_SIMPLE_TAG\n", iscsi_task_attr);
215 sam_task_attr = MSG_SIMPLE_TAG;
216 }
217
218 se_cmd = &cmd->se_cmd;
219 /*
220 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
221 */
222 transport_init_se_cmd(se_cmd, &lio_target_fabric_configfs->tf_ops,
223 conn->sess->se_sess, data_length, data_direction,
224 sam_task_attr, &cmd->sense_buffer[0]);
225 return cmd;
226}
227
228struct iscsi_cmd *iscsit_allocate_se_cmd_for_tmr(
229 struct iscsi_conn *conn,
230 u8 function)
231{
232 struct iscsi_cmd *cmd;
233 struct se_cmd *se_cmd;
234 u8 tcm_function;
235
236 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
237 if (!cmd)
238 return NULL;
239
240 cmd->data_direction = DMA_NONE;
241
242 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
243 if (!cmd->tmr_req) {
244 pr_err("Unable to allocate memory for"
245 " Task Management command!\n");
ba773669 246 goto out;
e48354ce
NB		 247 }
248 /*
249 * TASK_REASSIGN for ERL=2 / connection stays inside of
250 * LIO-Target $FABRIC_MOD
251 */
252 if (function == ISCSI_TM_FUNC_TASK_REASSIGN)
253 return cmd;
254
255 se_cmd = &cmd->se_cmd;
256 /*
257 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
258 */
259 transport_init_se_cmd(se_cmd, &lio_target_fabric_configfs->tf_ops,
260 conn->sess->se_sess, 0, DMA_NONE,
261 MSG_SIMPLE_TAG, &cmd->sense_buffer[0]);
262
263 switch (function) {
264 case ISCSI_TM_FUNC_ABORT_TASK:
265 tcm_function = TMR_ABORT_TASK;
266 break;
267 case ISCSI_TM_FUNC_ABORT_TASK_SET:
268 tcm_function = TMR_ABORT_TASK_SET;
269 break;
270 case ISCSI_TM_FUNC_CLEAR_ACA:
271 tcm_function = TMR_CLEAR_ACA;
272 break;
273 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
274 tcm_function = TMR_CLEAR_TASK_SET;
275 break;
276 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
277 tcm_function = TMR_LUN_RESET;
278 break;
279 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
280 tcm_function = TMR_TARGET_WARM_RESET;
281 break;
282 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
283 tcm_function = TMR_TARGET_COLD_RESET;
284 break;
285 default:
286 pr_err("Unknown iSCSI TMR Function:"
287 " 0x%02x\n", function);
288 goto out;
289 }
290
291 se_cmd->se_tmr_req = core_tmr_alloc_req(se_cmd,
292 (void *)cmd->tmr_req, tcm_function);
293 if (!se_cmd->se_tmr_req)
294 goto out;
295
296 cmd->tmr_req->se_tmr_req = se_cmd->se_tmr_req;
297
298 return cmd;
299out:
300 iscsit_release_cmd(cmd);
e48354ce
NB		 301 return NULL;
302}
303
304int iscsit_decide_list_to_build(
305 struct iscsi_cmd *cmd,
306 u32 immediate_data_length)
307{
308 struct iscsi_build_list bl;
309 struct iscsi_conn *conn = cmd->conn;
310 struct iscsi_session *sess = conn->sess;
311 struct iscsi_node_attrib *na;
312
313 if (sess->sess_ops->DataSequenceInOrder &&
314 sess->sess_ops->DataPDUInOrder)
315 return 0;
316
317 if (cmd->data_direction == DMA_NONE)
318 return 0;
319
320 na = iscsit_tpg_get_node_attrib(sess);
321 memset(&bl, 0, sizeof(struct iscsi_build_list));
322
323 if (cmd->data_direction == DMA_FROM_DEVICE) {
324 bl.data_direction = ISCSI_PDU_READ;
325 bl.type = PDULIST_NORMAL;
326 if (na->random_datain_pdu_offsets)
327 bl.randomize |= RANDOM_DATAIN_PDU_OFFSETS;
328 if (na->random_datain_seq_offsets)
329 bl.randomize |= RANDOM_DATAIN_SEQ_OFFSETS;
330 } else {
331 bl.data_direction = ISCSI_PDU_WRITE;
332 bl.immediate_data_length = immediate_data_length;
333 if (na->random_r2t_offsets)
334 bl.randomize |= RANDOM_R2T_OFFSETS;
335
336 if (!cmd->immediate_data && !cmd->unsolicited_data)
337 bl.type = PDULIST_NORMAL;
338 else if (cmd->immediate_data && !cmd->unsolicited_data)
339 bl.type = PDULIST_IMMEDIATE;
340 else if (!cmd->immediate_data && cmd->unsolicited_data)
341 bl.type = PDULIST_UNSOLICITED;
342 else if (cmd->immediate_data && cmd->unsolicited_data)
343 bl.type = PDULIST_IMMEDIATE_AND_UNSOLICITED;
344 }
345
346 return iscsit_do_build_list(cmd, &bl);
347}
348
349struct iscsi_seq *iscsit_get_seq_holder_for_datain(
350 struct iscsi_cmd *cmd,
351 u32 seq_send_order)
352{
353 u32 i;
354
355 for (i = 0; i < cmd->seq_count; i++)
356 if (cmd->seq_list[i].seq_send_order == seq_send_order)
357 return &cmd->seq_list[i];
358
359 return NULL;
360}
361
362struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsi_cmd *cmd)
363{
364 u32 i;
365
366 if (!cmd->seq_list) {
367 pr_err("struct iscsi_cmd->seq_list is NULL!\n");
368 return NULL;
369 }
370
371 for (i = 0; i < cmd->seq_count; i++) {
372 if (cmd->seq_list[i].type != SEQTYPE_NORMAL)
373 continue;
374 if (cmd->seq_list[i].seq_send_order == cmd->seq_send_order) {
375 cmd->seq_send_order++;
376 return &cmd->seq_list[i];
377 }
378 }
379
380 return NULL;
381}
382
383struct iscsi_r2t *iscsit_get_holder_for_r2tsn(
384 struct iscsi_cmd *cmd,
385 u32 r2t_sn)
386{
387 struct iscsi_r2t *r2t;
388
389 spin_lock_bh(&cmd->r2t_lock);
390 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
391 if (r2t->r2t_sn == r2t_sn) {
392 spin_unlock_bh(&cmd->r2t_lock);
393 return r2t;
394 }
395 }
396 spin_unlock_bh(&cmd->r2t_lock);
397
398 return NULL;
399}
400
401static inline int iscsit_check_received_cmdsn(struct iscsi_session *sess, u32 cmdsn)
402{
403 int ret;
404
405 /*
406 * This is the proper method of checking received CmdSN against
407 * ExpCmdSN and MaxCmdSN values, as well as accounting for out
408 * or order CmdSNs due to multiple connection sessions and/or
409 * CRC failures.
410 */
411 if (iscsi_sna_gt(cmdsn, sess->max_cmd_sn)) {
412 pr_err("Received CmdSN: 0x%08x is greater than"
413 " MaxCmdSN: 0x%08x, protocol error.\n", cmdsn,
414 sess->max_cmd_sn);
415 ret = CMDSN_ERROR_CANNOT_RECOVER;
416
417 } else if (cmdsn == sess->exp_cmd_sn) {
418 sess->exp_cmd_sn++;
419 pr_debug("Received CmdSN matches ExpCmdSN,"
420 " incremented ExpCmdSN to: 0x%08x\n",
421 sess->exp_cmd_sn);
422 ret = CMDSN_NORMAL_OPERATION;
423
424 } else if (iscsi_sna_gt(cmdsn, sess->exp_cmd_sn)) {
425 pr_debug("Received CmdSN: 0x%08x is greater"
426 " than ExpCmdSN: 0x%08x, not acknowledging.\n",
427 cmdsn, sess->exp_cmd_sn);
428 ret = CMDSN_HIGHER_THAN_EXP;
429
430 } else {
431 pr_err("Received CmdSN: 0x%08x is less than"
432 " ExpCmdSN: 0x%08x, ignoring.\n", cmdsn,
433 sess->exp_cmd_sn);
434 ret = CMDSN_LOWER_THAN_EXP;
435 }
436
437 return ret;
438}
439
440/*
441 * Commands may be received out of order if MC/S is in use.
442 * Ensure they are executed in CmdSN order.
443 */
444int iscsit_sequence_cmd(
445 struct iscsi_conn *conn,
446 struct iscsi_cmd *cmd,
447 u32 cmdsn)
448{
449 int ret;
450 int cmdsn_ret;
451
452 mutex_lock(&conn->sess->cmdsn_mutex);
453
454 cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, cmdsn);
455 switch (cmdsn_ret) {
456 case CMDSN_NORMAL_OPERATION:
457 ret = iscsit_execute_cmd(cmd, 0);
458 if ((ret >= 0) && !list_empty(&conn->sess->sess_ooo_cmdsn_list))
459 iscsit_execute_ooo_cmdsns(conn->sess);
460 break;
461 case CMDSN_HIGHER_THAN_EXP:
462 ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, cmdsn);
463 break;
464 case CMDSN_LOWER_THAN_EXP:
465 cmd->i_state = ISTATE_REMOVE;
466 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
467 ret = cmdsn_ret;
468 break;
469 default:
470 ret = cmdsn_ret;
471 break;
472 }
473 mutex_unlock(&conn->sess->cmdsn_mutex);
474
475 return ret;
476}
477
478int iscsit_check_unsolicited_dataout(struct iscsi_cmd *cmd, unsigned char *buf)
479{
480 struct iscsi_conn *conn = cmd->conn;
481 struct se_cmd *se_cmd = &cmd->se_cmd;
482 struct iscsi_data *hdr = (struct iscsi_data *) buf;
483 u32 payload_length = ntoh24(hdr->dlength);
484
485 if (conn->sess->sess_ops->InitialR2T) {
486 pr_err("Received unexpected unsolicited data"
487 " while InitialR2T=Yes, protocol error.\n");
488 transport_send_check_condition_and_sense(se_cmd,
489 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
490 return -1;
491 }
492
493 if ((cmd->first_burst_len + payload_length) >
494 conn->sess->sess_ops->FirstBurstLength) {
495 pr_err("Total %u bytes exceeds FirstBurstLength: %u"
496 " for this Unsolicited DataOut Burst.\n",
497 (cmd->first_burst_len + payload_length),
498 conn->sess->sess_ops->FirstBurstLength);
499 transport_send_check_condition_and_sense(se_cmd,
500 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
501 return -1;
502 }
503
504 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))
505 return 0;
506
507 if (((cmd->first_burst_len + payload_length) != cmd->data_length) &&
508 ((cmd->first_burst_len + payload_length) !=
509 conn->sess->sess_ops->FirstBurstLength)) {
510 pr_err("Unsolicited non-immediate data received %u"
511 " does not equal FirstBurstLength: %u, and does"
512 " not equal ExpXferLen %u.\n",
513 (cmd->first_burst_len + payload_length),
514 conn->sess->sess_ops->FirstBurstLength, cmd->data_length);
515 transport_send_check_condition_and_sense(se_cmd,
516 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
517 return -1;
518 }
519 return 0;
520}
521
522struct iscsi_cmd *iscsit_find_cmd_from_itt(
523 struct iscsi_conn *conn,
524 u32 init_task_tag)
525{
526 struct iscsi_cmd *cmd;
527
528 spin_lock_bh(&conn->cmd_lock);
529 list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
530 if (cmd->init_task_tag == init_task_tag) {
531 spin_unlock_bh(&conn->cmd_lock);
532 return cmd;
533 }
534 }
535 spin_unlock_bh(&conn->cmd_lock);
536
537 pr_err("Unable to locate ITT: 0x%08x on CID: %hu",
538 init_task_tag, conn->cid);
539 return NULL;
540}
541
542struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump(
543 struct iscsi_conn *conn,
544 u32 init_task_tag,
545 u32 length)
546{
547 struct iscsi_cmd *cmd;
548
549 spin_lock_bh(&conn->cmd_lock);
550 list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
551 if (cmd->init_task_tag == init_task_tag) {
552 spin_unlock_bh(&conn->cmd_lock);
553 return cmd;
554 }
555 }
556 spin_unlock_bh(&conn->cmd_lock);
557
558 pr_err("Unable to locate ITT: 0x%08x on CID: %hu,"
559 " dumping payload\n", init_task_tag, conn->cid);
560 if (length)
561 iscsit_dump_data_payload(conn, length, 1);
562
563 return NULL;
564}
565
566struct iscsi_cmd *iscsit_find_cmd_from_ttt(
567 struct iscsi_conn *conn,
568 u32 targ_xfer_tag)
569{
570 struct iscsi_cmd *cmd = NULL;
571
572 spin_lock_bh(&conn->cmd_lock);
573 list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) {
574 if (cmd->targ_xfer_tag == targ_xfer_tag) {
575 spin_unlock_bh(&conn->cmd_lock);
576 return cmd;
577 }
578 }
579 spin_unlock_bh(&conn->cmd_lock);
580
581 pr_err("Unable to locate TTT: 0x%08x on CID: %hu\n",
582 targ_xfer_tag, conn->cid);
583 return NULL;
584}
585
586int iscsit_find_cmd_for_recovery(
587 struct iscsi_session *sess,
588 struct iscsi_cmd **cmd_ptr,
589 struct iscsi_conn_recovery **cr_ptr,
590 u32 init_task_tag)
591{
592 struct iscsi_cmd *cmd = NULL;
593 struct iscsi_conn_recovery *cr;
594 /*
595 * Scan through the inactive connection recovery list's command list.
596 * If init_task_tag matches the command is still alligent.
597 */
598 spin_lock(&sess->cr_i_lock);
599 list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) {
600 spin_lock(&cr->conn_recovery_cmd_lock);
601 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_list) {
602 if (cmd->init_task_tag == init_task_tag) {
603 spin_unlock(&cr->conn_recovery_cmd_lock);
604 spin_unlock(&sess->cr_i_lock);
605
606 *cr_ptr = cr;
607 *cmd_ptr = cmd;
608 return -2;
609 }
610 }
611 spin_unlock(&cr->conn_recovery_cmd_lock);
612 }
613 spin_unlock(&sess->cr_i_lock);
614 /*
615 * Scan through the active connection recovery list's command list.
616 * If init_task_tag matches the command is ready to be reassigned.
617 */
618 spin_lock(&sess->cr_a_lock);
619 list_for_each_entry(cr, &sess->cr_active_list, cr_list) {
620 spin_lock(&cr->conn_recovery_cmd_lock);
621 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_list) {
622 if (cmd->init_task_tag == init_task_tag) {
623 spin_unlock(&cr->conn_recovery_cmd_lock);
624 spin_unlock(&sess->cr_a_lock);
625
626 *cr_ptr = cr;
627 *cmd_ptr = cmd;
628 return 0;
629 }
630 }
631 spin_unlock(&cr->conn_recovery_cmd_lock);
632 }
633 spin_unlock(&sess->cr_a_lock);
634
635 return -1;
636}
637
638void iscsit_add_cmd_to_immediate_queue(
639 struct iscsi_cmd *cmd,
640 struct iscsi_conn *conn,
641 u8 state)
642{
643 struct iscsi_queue_req *qr;
644
645 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
646 if (!qr) {
647 pr_err("Unable to allocate memory for"
648 " struct iscsi_queue_req\n");
649 return;
650 }
651 INIT_LIST_HEAD(&qr->qr_list);
652 qr->cmd = cmd;
653 qr->state = state;
654
655 spin_lock_bh(&conn->immed_queue_lock);
656 list_add_tail(&qr->qr_list, &conn->immed_queue_list);
657 atomic_inc(&cmd->immed_queue_count);
658 atomic_set(&conn->check_immediate_queue, 1);
659 spin_unlock_bh(&conn->immed_queue_lock);
660
661 wake_up_process(conn->thread_set->tx_thread);
662}
663
664struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *conn)
665{
666 struct iscsi_queue_req *qr;
667
668 spin_lock_bh(&conn->immed_queue_lock);
669 if (list_empty(&conn->immed_queue_list)) {
670 spin_unlock_bh(&conn->immed_queue_lock);
671 return NULL;
672 }
673 list_for_each_entry(qr, &conn->immed_queue_list, qr_list)
674 break;
675
676 list_del(&qr->qr_list);
677 if (qr->cmd)
678 atomic_dec(&qr->cmd->immed_queue_count);
679 spin_unlock_bh(&conn->immed_queue_lock);
680
681 return qr;
682}
683
684static void iscsit_remove_cmd_from_immediate_queue(
685 struct iscsi_cmd *cmd,
686 struct iscsi_conn *conn)
687{
688 struct iscsi_queue_req *qr, *qr_tmp;
689
690 spin_lock_bh(&conn->immed_queue_lock);
691 if (!atomic_read(&cmd->immed_queue_count)) {
692 spin_unlock_bh(&conn->immed_queue_lock);
693 return;
694 }
695
696 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
697 if (qr->cmd != cmd)
698 continue;
699
700 atomic_dec(&qr->cmd->immed_queue_count);
701 list_del(&qr->qr_list);
702 kmem_cache_free(lio_qr_cache, qr);
703 }
704 spin_unlock_bh(&conn->immed_queue_lock);
705
706 if (atomic_read(&cmd->immed_queue_count)) {
707 pr_err("ITT: 0x%08x immed_queue_count: %d\n",
708 cmd->init_task_tag,
709 atomic_read(&cmd->immed_queue_count));
710 }
711}
712
713void iscsit_add_cmd_to_response_queue(
714 struct iscsi_cmd *cmd,
715 struct iscsi_conn *conn,
716 u8 state)
717{
718 struct iscsi_queue_req *qr;
719
720 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
721 if (!qr) {
722 pr_err("Unable to allocate memory for"
723 " struct iscsi_queue_req\n");
724 return;
725 }
726 INIT_LIST_HEAD(&qr->qr_list);
727 qr->cmd = cmd;
728 qr->state = state;
729
730 spin_lock_bh(&conn->response_queue_lock);
731 list_add_tail(&qr->qr_list, &conn->response_queue_list);
732 atomic_inc(&cmd->response_queue_count);
733 spin_unlock_bh(&conn->response_queue_lock);
734
735 wake_up_process(conn->thread_set->tx_thread);
736}
737
738struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *conn)
739{
740 struct iscsi_queue_req *qr;
741
742 spin_lock_bh(&conn->response_queue_lock);
743 if (list_empty(&conn->response_queue_list)) {
744 spin_unlock_bh(&conn->response_queue_lock);
745 return NULL;
746 }
747
748 list_for_each_entry(qr, &conn->response_queue_list, qr_list)
749 break;
750
751 list_del(&qr->qr_list);
752 if (qr->cmd)
753 atomic_dec(&qr->cmd->response_queue_count);
754 spin_unlock_bh(&conn->response_queue_lock);
755
756 return qr;
757}
758
759static void iscsit_remove_cmd_from_response_queue(
760 struct iscsi_cmd *cmd,
761 struct iscsi_conn *conn)
762{
763 struct iscsi_queue_req *qr, *qr_tmp;
764
765 spin_lock_bh(&conn->response_queue_lock);
766 if (!atomic_read(&cmd->response_queue_count)) {
767 spin_unlock_bh(&conn->response_queue_lock);
768 return;
769 }
770
771 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
772 qr_list) {
773 if (qr->cmd != cmd)
774 continue;
775
776 atomic_dec(&qr->cmd->response_queue_count);
777 list_del(&qr->qr_list);
778 kmem_cache_free(lio_qr_cache, qr);
779 }
780 spin_unlock_bh(&conn->response_queue_lock);
781
782 if (atomic_read(&cmd->response_queue_count)) {
783 pr_err("ITT: 0x%08x response_queue_count: %d\n",
784 cmd->init_task_tag,
785 atomic_read(&cmd->response_queue_count));
786 }
787}
788
789void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn)
790{
791 struct iscsi_queue_req *qr, *qr_tmp;
792
793 spin_lock_bh(&conn->immed_queue_lock);
794 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
795 list_del(&qr->qr_list);
796 if (qr->cmd)
797 atomic_dec(&qr->cmd->immed_queue_count);
798
799 kmem_cache_free(lio_qr_cache, qr);
800 }
801 spin_unlock_bh(&conn->immed_queue_lock);
802
803 spin_lock_bh(&conn->response_queue_lock);
804 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
805 qr_list) {
806 list_del(&qr->qr_list);
807 if (qr->cmd)
808 atomic_dec(&qr->cmd->response_queue_count);
809
810 kmem_cache_free(lio_qr_cache, qr);
811 }
812 spin_unlock_bh(&conn->response_queue_lock);
813}
814
815void iscsit_release_cmd(struct iscsi_cmd *cmd)
816{
817 struct iscsi_conn *conn = cmd->conn;
818 int i;
819
820 iscsit_free_r2ts_from_list(cmd);
821 iscsit_free_all_datain_reqs(cmd);
822
823 kfree(cmd->buf_ptr);
824 kfree(cmd->pdu_list);
825 kfree(cmd->seq_list);
826 kfree(cmd->tmr_req);
827 kfree(cmd->iov_data);
828
829 for (i = 0; i < cmd->t_mem_sg_nents; i++)
830 __free_page(sg_page(&cmd->t_mem_sg[i]));
831
832 kfree(cmd->t_mem_sg);
833
834 if (conn) {
835 iscsit_remove_cmd_from_immediate_queue(cmd, conn);
836 iscsit_remove_cmd_from_response_queue(cmd, conn);
837 }
838
839 kmem_cache_free(lio_cmd_cache, cmd);
840}
841
842int iscsit_check_session_usage_count(struct iscsi_session *sess)
843{
844 spin_lock_bh(&sess->session_usage_lock);
845 if (sess->session_usage_count != 0) {
846 sess->session_waiting_on_uc = 1;
847 spin_unlock_bh(&sess->session_usage_lock);
848 if (in_interrupt())
849 return 2;
850
851 wait_for_completion(&sess->session_waiting_on_uc_comp);
852 return 1;
853 }
854 spin_unlock_bh(&sess->session_usage_lock);
855
856 return 0;
857}
858
859void iscsit_dec_session_usage_count(struct iscsi_session *sess)
860{
861 spin_lock_bh(&sess->session_usage_lock);
862 sess->session_usage_count--;
863
864 if (!sess->session_usage_count && sess->session_waiting_on_uc)
865 complete(&sess->session_waiting_on_uc_comp);
866
867 spin_unlock_bh(&sess->session_usage_lock);
868}
869
870void iscsit_inc_session_usage_count(struct iscsi_session *sess)
871{
872 spin_lock_bh(&sess->session_usage_lock);
873 sess->session_usage_count++;
874 spin_unlock_bh(&sess->session_usage_lock);
875}
876
877/*
878 * Used before iscsi_do[rx,tx]_data() to determine iov and [rx,tx]_marker
879 * array counts needed for sync and steering.
880 */
881static int iscsit_determine_sync_and_steering_counts(
882 struct iscsi_conn *conn,
883 struct iscsi_data_count *count)
884{
885 u32 length = count->data_length;
886 u32 marker, markint;
887
888 count->sync_and_steering = 1;
889
890 marker = (count->type == ISCSI_RX_DATA) ?
891 conn->of_marker : conn->if_marker;
892 markint = (count->type == ISCSI_RX_DATA) ?
893 (conn->conn_ops->OFMarkInt * 4) :
894 (conn->conn_ops->IFMarkInt * 4);
895 count->ss_iov_count = count->iov_count;
896
897 while (length > 0) {
898 if (length >= marker) {
899 count->ss_iov_count += 3;
900 count->ss_marker_count += 2;
901
902 length -= marker;
903 marker = markint;
904 } else
905 length = 0;
906 }
907
908 return 0;
909}
910
911/*
912 * Setup conn->if_marker and conn->of_marker values based upon
913 * the initial marker-less interval. (see iSCSI v19 A.2)
914 */
915int iscsit_set_sync_and_steering_values(struct iscsi_conn *conn)
916{
917 int login_ifmarker_count = 0, login_ofmarker_count = 0, next_marker = 0;
918 /*
919 * IFMarkInt and OFMarkInt are negotiated as 32-bit words.
920 */
921 u32 IFMarkInt = (conn->conn_ops->IFMarkInt * 4);
922 u32 OFMarkInt = (conn->conn_ops->OFMarkInt * 4);
923
924 if (conn->conn_ops->OFMarker) {
925 /*
926 * Account for the first Login Command received not
927 * via iscsi_recv_msg().
928 */
929 conn->of_marker += ISCSI_HDR_LEN;
930 if (conn->of_marker <= OFMarkInt) {
931 conn->of_marker = (OFMarkInt - conn->of_marker);
932 } else {
933 login_ofmarker_count = (conn->of_marker / OFMarkInt);
934 next_marker = (OFMarkInt * (login_ofmarker_count + 1)) +
935 (login_ofmarker_count * MARKER_SIZE);
936 conn->of_marker = (next_marker - conn->of_marker);
937 }
938 conn->of_marker_offset = 0;
939 pr_debug("Setting OFMarker value to %u based on Initial"
940 " Markerless Interval.\n", conn->of_marker);
941 }
942
943 if (conn->conn_ops->IFMarker) {
944 if (conn->if_marker <= IFMarkInt) {
945 conn->if_marker = (IFMarkInt - conn->if_marker);
946 } else {
947 login_ifmarker_count = (conn->if_marker / IFMarkInt);
948 next_marker = (IFMarkInt * (login_ifmarker_count + 1)) +
949 (login_ifmarker_count * MARKER_SIZE);
950 conn->if_marker = (next_marker - conn->if_marker);
951 }
952 pr_debug("Setting IFMarker value to %u based on Initial"
953 " Markerless Interval.\n", conn->if_marker);
954 }
955
956 return 0;
957}
958
959struct iscsi_conn *iscsit_get_conn_from_cid(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 (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) {
967 iscsit_inc_conn_usage_count(conn);
968 spin_unlock_bh(&sess->conn_lock);
969 return conn;
970 }
971 }
972 spin_unlock_bh(&sess->conn_lock);
973
974 return NULL;
975}
976
977struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid)
978{
979 struct iscsi_conn *conn;
980
981 spin_lock_bh(&sess->conn_lock);
982 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
983 if (conn->cid == cid) {
984 iscsit_inc_conn_usage_count(conn);
985 spin_lock(&conn->state_lock);
986 atomic_set(&conn->connection_wait_rcfr, 1);
987 spin_unlock(&conn->state_lock);
988 spin_unlock_bh(&sess->conn_lock);
989 return conn;
990 }
991 }
992 spin_unlock_bh(&sess->conn_lock);
993
994 return NULL;
995}
996
997void iscsit_check_conn_usage_count(struct iscsi_conn *conn)
998{
999 spin_lock_bh(&conn->conn_usage_lock);
1000 if (conn->conn_usage_count != 0) {
1001 conn->conn_waiting_on_uc = 1;
1002 spin_unlock_bh(&conn->conn_usage_lock);
1003
1004 wait_for_completion(&conn->conn_waiting_on_uc_comp);
1005 return;
1006 }
1007 spin_unlock_bh(&conn->conn_usage_lock);
1008}
1009
1010void iscsit_dec_conn_usage_count(struct iscsi_conn *conn)
1011{
1012 spin_lock_bh(&conn->conn_usage_lock);
1013 conn->conn_usage_count--;
1014
1015 if (!conn->conn_usage_count && conn->conn_waiting_on_uc)
1016 complete(&conn->conn_waiting_on_uc_comp);
1017
1018 spin_unlock_bh(&conn->conn_usage_lock);
1019}
1020
1021void iscsit_inc_conn_usage_count(struct iscsi_conn *conn)
1022{
1023 spin_lock_bh(&conn->conn_usage_lock);
1024 conn->conn_usage_count++;
1025 spin_unlock_bh(&conn->conn_usage_lock);
1026}
1027
1028static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response)
1029{
1030 u8 state;
1031 struct iscsi_cmd *cmd;
1032
1033 cmd = iscsit_allocate_cmd(conn, GFP_ATOMIC);
1034 if (!cmd)
1035 return -1;
1036
1037 cmd->iscsi_opcode = ISCSI_OP_NOOP_IN;
1038 state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE :
1039 ISTATE_SEND_NOPIN_NO_RESPONSE;
1040 cmd->init_task_tag = 0xFFFFFFFF;
1041 spin_lock_bh(&conn->sess->ttt_lock);
1042 cmd->targ_xfer_tag = (want_response) ? conn->sess->targ_xfer_tag++ :
1043 0xFFFFFFFF;
1044 if (want_response && (cmd->targ_xfer_tag == 0xFFFFFFFF))
1045 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
1046 spin_unlock_bh(&conn->sess->ttt_lock);
1047
1048 spin_lock_bh(&conn->cmd_lock);
1049 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1050 spin_unlock_bh(&conn->cmd_lock);
1051
1052 if (want_response)
1053 iscsit_start_nopin_response_timer(conn);
1054 iscsit_add_cmd_to_immediate_queue(cmd, conn, state);
1055
1056 return 0;
1057}
1058
1059static void iscsit_handle_nopin_response_timeout(unsigned long data)
1060{
1061 struct iscsi_conn *conn = (struct iscsi_conn *) data;
1062
1063 iscsit_inc_conn_usage_count(conn);
1064
1065 spin_lock_bh(&conn->nopin_timer_lock);
1066 if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) {
1067 spin_unlock_bh(&conn->nopin_timer_lock);
1068 iscsit_dec_conn_usage_count(conn);
1069 return;
1070 }
1071
1072 pr_debug("Did not receive response to NOPIN on CID: %hu on"
1073 " SID: %u, failing connection.\n", conn->cid,
1074 conn->sess->sid);
1075 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
1076 spin_unlock_bh(&conn->nopin_timer_lock);
1077
1078 {
1079 struct iscsi_portal_group *tpg = conn->sess->tpg;
1080 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
1081
1082 if (tiqn) {
1083 spin_lock_bh(&tiqn->sess_err_stats.lock);
1084 strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
1085 (void *)conn->sess->sess_ops->InitiatorName);
1086 tiqn->sess_err_stats.last_sess_failure_type =
1087 ISCSI_SESS_ERR_CXN_TIMEOUT;
1088 tiqn->sess_err_stats.cxn_timeout_errors++;
1089 conn->sess->conn_timeout_errors++;
1090 spin_unlock_bh(&tiqn->sess_err_stats.lock);
1091 }
1092 }
1093
1094 iscsit_cause_connection_reinstatement(conn, 0);
1095 iscsit_dec_conn_usage_count(conn);
1096}
1097
1098void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn)
1099{
1100 struct iscsi_session *sess = conn->sess;
1101 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1102
1103 spin_lock_bh(&conn->nopin_timer_lock);
1104 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
1105 spin_unlock_bh(&conn->nopin_timer_lock);
1106 return;
1107 }
1108
1109 mod_timer(&conn->nopin_response_timer,
1110 (get_jiffies_64() + na->nopin_response_timeout * HZ));
1111 spin_unlock_bh(&conn->nopin_timer_lock);
1112}
1113
1114/*
1115 * Called with conn->nopin_timer_lock held.
1116 */
1117void iscsit_start_nopin_response_timer(struct iscsi_conn *conn)
1118{
1119 struct iscsi_session *sess = conn->sess;
1120 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1121
1122 spin_lock_bh(&conn->nopin_timer_lock);
1123 if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) {
1124 spin_unlock_bh(&conn->nopin_timer_lock);
1125 return;
1126 }
1127
1128 init_timer(&conn->nopin_response_timer);
1129 conn->nopin_response_timer.expires =
1130 (get_jiffies_64() + na->nopin_response_timeout * HZ);
1131 conn->nopin_response_timer.data = (unsigned long)conn;
1132 conn->nopin_response_timer.function = iscsit_handle_nopin_response_timeout;
1133 conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP;
1134 conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING;
1135 add_timer(&conn->nopin_response_timer);
1136
1137 pr_debug("Started NOPIN Response Timer on CID: %d to %u"
1138 " seconds\n", conn->cid, na->nopin_response_timeout);
1139 spin_unlock_bh(&conn->nopin_timer_lock);
1140}
1141
1142void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn)
1143{
1144 spin_lock_bh(&conn->nopin_timer_lock);
1145 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
1146 spin_unlock_bh(&conn->nopin_timer_lock);
1147 return;
1148 }
1149 conn->nopin_response_timer_flags |= ISCSI_TF_STOP;
1150 spin_unlock_bh(&conn->nopin_timer_lock);
1151
1152 del_timer_sync(&conn->nopin_response_timer);
1153
1154 spin_lock_bh(&conn->nopin_timer_lock);
1155 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
1156 spin_unlock_bh(&conn->nopin_timer_lock);
1157}
1158
1159static void iscsit_handle_nopin_timeout(unsigned long data)
1160{
1161 struct iscsi_conn *conn = (struct iscsi_conn *) data;
1162
1163 iscsit_inc_conn_usage_count(conn);
1164
1165 spin_lock_bh(&conn->nopin_timer_lock);
1166 if (conn->nopin_timer_flags & ISCSI_TF_STOP) {
1167 spin_unlock_bh(&conn->nopin_timer_lock);
1168 iscsit_dec_conn_usage_count(conn);
1169 return;
1170 }
1171 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1172 spin_unlock_bh(&conn->nopin_timer_lock);
1173
1174 iscsit_add_nopin(conn, 1);
1175 iscsit_dec_conn_usage_count(conn);
1176}
1177
1178/*
1179 * Called with conn->nopin_timer_lock held.
1180 */
1181void __iscsit_start_nopin_timer(struct iscsi_conn *conn)
1182{
1183 struct iscsi_session *sess = conn->sess;
1184 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1185 /*
1186 * NOPIN timeout is disabled.
1187 */
1188 if (!na->nopin_timeout)
1189 return;
1190
1191 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING)
1192 return;
1193
1194 init_timer(&conn->nopin_timer);
1195 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1196 conn->nopin_timer.data = (unsigned long)conn;
1197 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1198 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1199 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1200 add_timer(&conn->nopin_timer);
1201
1202 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1203 " interval\n", conn->cid, na->nopin_timeout);
1204}
1205
1206void iscsit_start_nopin_timer(struct iscsi_conn *conn)
1207{
1208 struct iscsi_session *sess = conn->sess;
1209 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1210 /*
1211 * NOPIN timeout is disabled..
1212 */
1213 if (!na->nopin_timeout)
1214 return;
1215
1216 spin_lock_bh(&conn->nopin_timer_lock);
1217 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) {
1218 spin_unlock_bh(&conn->nopin_timer_lock);
1219 return;
1220 }
1221
1222 init_timer(&conn->nopin_timer);
1223 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1224 conn->nopin_timer.data = (unsigned long)conn;
1225 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1226 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1227 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1228 add_timer(&conn->nopin_timer);
1229
1230 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1231 " interval\n", conn->cid, na->nopin_timeout);
1232 spin_unlock_bh(&conn->nopin_timer_lock);
1233}
1234
1235void iscsit_stop_nopin_timer(struct iscsi_conn *conn)
1236{
1237 spin_lock_bh(&conn->nopin_timer_lock);
1238 if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) {
1239 spin_unlock_bh(&conn->nopin_timer_lock);
1240 return;
1241 }
1242 conn->nopin_timer_flags |= ISCSI_TF_STOP;
1243 spin_unlock_bh(&conn->nopin_timer_lock);
1244
1245 del_timer_sync(&conn->nopin_timer);
1246
1247 spin_lock_bh(&conn->nopin_timer_lock);
1248 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1249 spin_unlock_bh(&conn->nopin_timer_lock);
1250}
1251
1252int iscsit_send_tx_data(
1253 struct iscsi_cmd *cmd,
1254 struct iscsi_conn *conn,
1255 int use_misc)
1256{
1257 int tx_sent, tx_size;
1258 u32 iov_count;
1259 struct kvec *iov;
1260
1261send_data:
1262 tx_size = cmd->tx_size;
1263
1264 if (!use_misc) {
1265 iov = &cmd->iov_data[0];
1266 iov_count = cmd->iov_data_count;
1267 } else {
1268 iov = &cmd->iov_misc[0];
1269 iov_count = cmd->iov_misc_count;
1270 }
1271
1272 tx_sent = tx_data(conn, &iov[0], iov_count, tx_size);
1273 if (tx_size != tx_sent) {
1274 if (tx_sent == -EAGAIN) {
1275 pr_err("tx_data() returned -EAGAIN\n");
1276 goto send_data;
1277 } else
1278 return -1;
1279 }
1280 cmd->tx_size = 0;
1281
1282 return 0;
1283}
1284
1285int iscsit_fe_sendpage_sg(
1286 struct iscsi_cmd *cmd,
1287 struct iscsi_conn *conn)
1288{
1289 struct scatterlist *sg = cmd->first_data_sg;
1290 struct kvec iov;
1291 u32 tx_hdr_size, data_len;
1292 u32 offset = cmd->first_data_sg_off;
1293 int tx_sent;
1294
1295send_hdr:
1296 tx_hdr_size = ISCSI_HDR_LEN;
1297 if (conn->conn_ops->HeaderDigest)
1298 tx_hdr_size += ISCSI_CRC_LEN;
1299
1300 iov.iov_base = cmd->pdu;
1301 iov.iov_len = tx_hdr_size;
1302
1303 tx_sent = tx_data(conn, &iov, 1, tx_hdr_size);
1304 if (tx_hdr_size != tx_sent) {
1305 if (tx_sent == -EAGAIN) {
1306 pr_err("tx_data() returned -EAGAIN\n");
1307 goto send_hdr;
1308 }
1309 return -1;
1310 }
1311
1312 data_len = cmd->tx_size - tx_hdr_size - cmd->padding;
1313 if (conn->conn_ops->DataDigest)
1314 data_len -= ISCSI_CRC_LEN;
1315
1316 /*
1317 * Perform sendpage() for each page in the scatterlist
1318 */
1319 while (data_len) {
1320 u32 space = (sg->length - offset);
1321 u32 sub_len = min_t(u32, data_len, space);
1322send_pg:
1323 tx_sent = conn->sock->ops->sendpage(conn->sock,
1324 sg_page(sg), sg->offset + offset, sub_len, 0);
1325 if (tx_sent != sub_len) {
1326 if (tx_sent == -EAGAIN) {
1327 pr_err("tcp_sendpage() returned"
1328 " -EAGAIN\n");
1329 goto send_pg;
1330 }
1331
1332 pr_err("tcp_sendpage() failure: %d\n",
1333 tx_sent);
1334 return -1;
1335 }
1336
1337 data_len -= sub_len;
1338 offset = 0;
1339 sg = sg_next(sg);
1340 }
1341
1342send_padding:
1343 if (cmd->padding) {
1344 struct kvec *iov_p =
1345 &cmd->iov_data[cmd->iov_data_count-1];
1346
1347 tx_sent = tx_data(conn, iov_p, 1, cmd->padding);
1348 if (cmd->padding != tx_sent) {
1349 if (tx_sent == -EAGAIN) {
1350 pr_err("tx_data() returned -EAGAIN\n");
1351 goto send_padding;
1352 }
1353 return -1;
1354 }
1355 }
1356
1357send_datacrc:
1358 if (conn->conn_ops->DataDigest) {
1359 struct kvec *iov_d =
1360 &cmd->iov_data[cmd->iov_data_count];
1361
1362 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN);
1363 if (ISCSI_CRC_LEN != tx_sent) {
1364 if (tx_sent == -EAGAIN) {
1365 pr_err("tx_data() returned -EAGAIN\n");
1366 goto send_datacrc;
1367 }
1368 return -1;
1369 }
1370 }
1371
1372 return 0;
1373}
1374
1375/*
1376 * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU
1377 * back to the Initiator when an expection condition occurs with the
1378 * errors set in status_class and status_detail.
1379 *
1380 * Parameters: iSCSI Connection, Status Class, Status Detail.
1381 * Returns: 0 on success, -1 on error.
1382 */
1383int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail)
1384{
1385 u8 iscsi_hdr[ISCSI_HDR_LEN];
1386 int err;
1387 struct kvec iov;
1388 struct iscsi_login_rsp *hdr;
1389
1390 iscsit_collect_login_stats(conn, status_class, status_detail);
1391
1392 memset(&iov, 0, sizeof(struct kvec));
1393 memset(&iscsi_hdr, 0x0, ISCSI_HDR_LEN);
1394
1395 hdr = (struct iscsi_login_rsp *)&iscsi_hdr;
1396 hdr->opcode = ISCSI_OP_LOGIN_RSP;
1397 hdr->status_class = status_class;
1398 hdr->status_detail = status_detail;
1399 hdr->itt = cpu_to_be32(conn->login_itt);
1400
1401 iov.iov_base = &iscsi_hdr;
1402 iov.iov_len = ISCSI_HDR_LEN;
1403
1404 PRINT_BUFF(iscsi_hdr, ISCSI_HDR_LEN);
1405
1406 err = tx_data(conn, &iov, 1, ISCSI_HDR_LEN);
1407 if (err != ISCSI_HDR_LEN) {
1408 pr_err("tx_data returned less than expected\n");
1409 return -1;
1410 }
1411
1412 return 0;
1413}
1414
1415void iscsit_print_session_params(struct iscsi_session *sess)
1416{
1417 struct iscsi_conn *conn;
1418
1419 pr_debug("-----------------------------[Session Params for"
1420 " SID: %u]-----------------------------\n", sess->sid);
1421 spin_lock_bh(&sess->conn_lock);
1422 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
1423 iscsi_dump_conn_ops(conn->conn_ops);
1424 spin_unlock_bh(&sess->conn_lock);
1425
1426 iscsi_dump_sess_ops(sess->sess_ops);
1427}
1428
1429static int iscsit_do_rx_data(
1430 struct iscsi_conn *conn,
1431 struct iscsi_data_count *count)
1432{
1433 int data = count->data_length, rx_loop = 0, total_rx = 0, iov_len;
1434 u32 rx_marker_val[count->ss_marker_count], rx_marker_iov = 0;
1435 struct kvec iov[count->ss_iov_count], *iov_p;
1436 struct msghdr msg;
1437
1438 if (!conn || !conn->sock || !conn->conn_ops)
1439 return -1;
1440
1441 memset(&msg, 0, sizeof(struct msghdr));
1442
1443 if (count->sync_and_steering) {
1444 int size = 0;
1445 u32 i, orig_iov_count = 0;
1446 u32 orig_iov_len = 0, orig_iov_loc = 0;
1447 u32 iov_count = 0, per_iov_bytes = 0;
1448 u32 *rx_marker, old_rx_marker = 0;
1449 struct kvec *iov_record;
1450
1451 memset(&rx_marker_val, 0,
1452 count->ss_marker_count * sizeof(u32));
1453 memset(&iov, 0, count->ss_iov_count * sizeof(struct kvec));
1454
1455 iov_record = count->iov;
1456 orig_iov_count = count->iov_count;
1457 rx_marker = &conn->of_marker;
1458
1459 i = 0;
1460 size = data;
1461 orig_iov_len = iov_record[orig_iov_loc].iov_len;
1462 while (size > 0) {
1463 pr_debug("rx_data: #1 orig_iov_len %u,"
1464 " orig_iov_loc %u\n", orig_iov_len, orig_iov_loc);
1465 pr_debug("rx_data: #2 rx_marker %u, size"
1466 " %u\n", *rx_marker, size);
1467
1468 if (orig_iov_len >= *rx_marker) {
1469 iov[iov_count].iov_len = *rx_marker;
1470 iov[iov_count++].iov_base =
1471 (iov_record[orig_iov_loc].iov_base +
1472 per_iov_bytes);
1473
1474 iov[iov_count].iov_len = (MARKER_SIZE / 2);
1475 iov[iov_count++].iov_base =
1476 &rx_marker_val[rx_marker_iov++];
1477 iov[iov_count].iov_len = (MARKER_SIZE / 2);
1478 iov[iov_count++].iov_base =
1479 &rx_marker_val[rx_marker_iov++];
1480 old_rx_marker = *rx_marker;
1481
1482 /*
1483 * OFMarkInt is in 32-bit words.
1484 */
1485 *rx_marker = (conn->conn_ops->OFMarkInt * 4);
1486 size -= old_rx_marker;
1487 orig_iov_len -= old_rx_marker;
1488 per_iov_bytes += old_rx_marker;
1489
1490 pr_debug("rx_data: #3 new_rx_marker"
1491 " %u, size %u\n", *rx_marker, size);
1492 } else {
1493 iov[iov_count].iov_len = orig_iov_len;
1494 iov[iov_count++].iov_base =
1495 (iov_record[orig_iov_loc].iov_base +
1496 per_iov_bytes);
1497
1498 per_iov_bytes = 0;
1499 *rx_marker -= orig_iov_len;
1500 size -= orig_iov_len;
1501
1502 if (size)
1503 orig_iov_len =
1504 iov_record[++orig_iov_loc].iov_len;
1505
1506 pr_debug("rx_data: #4 new_rx_marker"
1507 " %u, size %u\n", *rx_marker, size);
1508 }
1509 }
1510 data += (rx_marker_iov * (MARKER_SIZE / 2));
1511
1512 iov_p = &iov[0];
1513 iov_len = iov_count;
1514
1515 if (iov_count > count->ss_iov_count) {
1516 pr_err("iov_count: %d, count->ss_iov_count:"
1517 " %d\n", iov_count, count->ss_iov_count);
1518 return -1;
1519 }
1520 if (rx_marker_iov > count->ss_marker_count) {
1521 pr_err("rx_marker_iov: %d, count->ss_marker"
1522 "_count: %d\n", rx_marker_iov,
1523 count->ss_marker_count);
1524 return -1;
1525 }
1526 } else {
1527 iov_p = count->iov;
1528 iov_len = count->iov_count;
1529 }
1530
1531 while (total_rx < data) {
1532 rx_loop = kernel_recvmsg(conn->sock, &msg, iov_p, iov_len,
1533 (data - total_rx), MSG_WAITALL);
1534 if (rx_loop <= 0) {
1535 pr_debug("rx_loop: %d total_rx: %d\n",
1536 rx_loop, total_rx);
1537 return rx_loop;
1538 }
1539 total_rx += rx_loop;
1540 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n",
1541 rx_loop, total_rx, data);
1542 }
1543
1544 if (count->sync_and_steering) {
1545 int j;
1546 for (j = 0; j < rx_marker_iov; j++) {
1547 pr_debug("rx_data: #5 j: %d, offset: %d\n",
1548 j, rx_marker_val[j]);
1549 conn->of_marker_offset = rx_marker_val[j];
1550 }
1551 total_rx -= (rx_marker_iov * (MARKER_SIZE / 2));
1552 }
1553
1554 return total_rx;
1555}
1556
1557static int iscsit_do_tx_data(
1558 struct iscsi_conn *conn,
1559 struct iscsi_data_count *count)
1560{
1561 int data = count->data_length, total_tx = 0, tx_loop = 0, iov_len;
1562 u32 tx_marker_val[count->ss_marker_count], tx_marker_iov = 0;
1563 struct kvec iov[count->ss_iov_count], *iov_p;
1564 struct msghdr msg;
1565
1566 if (!conn || !conn->sock || !conn->conn_ops)
1567 return -1;
1568
1569 if (data <= 0) {
1570 pr_err("Data length is: %d\n", data);
1571 return -1;
1572 }
1573
1574 memset(&msg, 0, sizeof(struct msghdr));
1575
1576 if (count->sync_and_steering) {
1577 int size = 0;
1578 u32 i, orig_iov_count = 0;
1579 u32 orig_iov_len = 0, orig_iov_loc = 0;
1580 u32 iov_count = 0, per_iov_bytes = 0;
1581 u32 *tx_marker, old_tx_marker = 0;
1582 struct kvec *iov_record;
1583
1584 memset(&tx_marker_val, 0,
1585 count->ss_marker_count * sizeof(u32));
1586 memset(&iov, 0, count->ss_iov_count * sizeof(struct kvec));
1587
1588 iov_record = count->iov;
1589 orig_iov_count = count->iov_count;
1590 tx_marker = &conn->if_marker;
1591
1592 i = 0;
1593 size = data;
1594 orig_iov_len = iov_record[orig_iov_loc].iov_len;
1595 while (size > 0) {
1596 pr_debug("tx_data: #1 orig_iov_len %u,"
1597 " orig_iov_loc %u\n", orig_iov_len, orig_iov_loc);
1598 pr_debug("tx_data: #2 tx_marker %u, size"
1599 " %u\n", *tx_marker, size);
1600
1601 if (orig_iov_len >= *tx_marker) {
1602 iov[iov_count].iov_len = *tx_marker;
1603 iov[iov_count++].iov_base =
1604 (iov_record[orig_iov_loc].iov_base +
1605 per_iov_bytes);
1606
1607 tx_marker_val[tx_marker_iov] =
1608 (size - *tx_marker);
1609 iov[iov_count].iov_len = (MARKER_SIZE / 2);
1610 iov[iov_count++].iov_base =
1611 &tx_marker_val[tx_marker_iov++];
1612 iov[iov_count].iov_len = (MARKER_SIZE / 2);
1613 iov[iov_count++].iov_base =
1614 &tx_marker_val[tx_marker_iov++];
1615 old_tx_marker = *tx_marker;
1616
1617 /*
1618 * IFMarkInt is in 32-bit words.
1619 */
1620 *tx_marker = (conn->conn_ops->IFMarkInt * 4);
1621 size -= old_tx_marker;
1622 orig_iov_len -= old_tx_marker;
1623 per_iov_bytes += old_tx_marker;
1624
1625 pr_debug("tx_data: #3 new_tx_marker"
1626 " %u, size %u\n", *tx_marker, size);
1627 pr_debug("tx_data: #4 offset %u\n",
1628 tx_marker_val[tx_marker_iov-1]);
1629 } else {
1630 iov[iov_count].iov_len = orig_iov_len;
1631 iov[iov_count++].iov_base
1632 = (iov_record[orig_iov_loc].iov_base +
1633 per_iov_bytes);
1634
1635 per_iov_bytes = 0;
1636 *tx_marker -= orig_iov_len;
1637 size -= orig_iov_len;
1638
1639 if (size)
1640 orig_iov_len =
1641 iov_record[++orig_iov_loc].iov_len;
1642
1643 pr_debug("tx_data: #5 new_tx_marker"
1644 " %u, size %u\n", *tx_marker, size);
1645 }
1646 }
1647
1648 data += (tx_marker_iov * (MARKER_SIZE / 2));
1649
1650 iov_p = &iov[0];
1651 iov_len = iov_count;
1652
1653 if (iov_count > count->ss_iov_count) {
1654 pr_err("iov_count: %d, count->ss_iov_count:"
1655 " %d\n", iov_count, count->ss_iov_count);
1656 return -1;
1657 }
1658 if (tx_marker_iov > count->ss_marker_count) {
1659 pr_err("tx_marker_iov: %d, count->ss_marker"
1660 "_count: %d\n", tx_marker_iov,
1661 count->ss_marker_count);
1662 return -1;
1663 }
1664 } else {
1665 iov_p = count->iov;
1666 iov_len = count->iov_count;
1667 }
1668
1669 while (total_tx < data) {
1670 tx_loop = kernel_sendmsg(conn->sock, &msg, iov_p, iov_len,
1671 (data - total_tx));
1672 if (tx_loop <= 0) {
1673 pr_debug("tx_loop: %d total_tx %d\n",
1674 tx_loop, total_tx);
1675 return tx_loop;
1676 }
1677 total_tx += tx_loop;
1678 pr_debug("tx_loop: %d, total_tx: %d, data: %d\n",
1679 tx_loop, total_tx, data);
1680 }
1681
1682 if (count->sync_and_steering)
1683 total_tx -= (tx_marker_iov * (MARKER_SIZE / 2));
1684
1685 return total_tx;
1686}
1687
1688int rx_data(
1689 struct iscsi_conn *conn,
1690 struct kvec *iov,
1691 int iov_count,
1692 int data)
1693{
1694 struct iscsi_data_count c;
1695
1696 if (!conn || !conn->sock || !conn->conn_ops)
1697 return -1;
1698
1699 memset(&c, 0, sizeof(struct iscsi_data_count));
1700 c.iov = iov;
1701 c.iov_count = iov_count;
1702 c.data_length = data;
1703 c.type = ISCSI_RX_DATA;
1704
1705 if (conn->conn_ops->OFMarker &&
1706 (conn->conn_state >= TARG_CONN_STATE_LOGGED_IN)) {
1707 if (iscsit_determine_sync_and_steering_counts(conn, &c) < 0)
1708 return -1;
1709 }
1710
1711 return iscsit_do_rx_data(conn, &c);
1712}
1713
1714int tx_data(
1715 struct iscsi_conn *conn,
1716 struct kvec *iov,
1717 int iov_count,
1718 int data)
1719{
1720 struct iscsi_data_count c;
1721
1722 if (!conn || !conn->sock || !conn->conn_ops)
1723 return -1;
1724
1725 memset(&c, 0, sizeof(struct iscsi_data_count));
1726 c.iov = iov;
1727 c.iov_count = iov_count;
1728 c.data_length = data;
1729 c.type = ISCSI_TX_DATA;
1730
1731 if (conn->conn_ops->IFMarker &&
1732 (conn->conn_state >= TARG_CONN_STATE_LOGGED_IN)) {
1733 if (iscsit_determine_sync_and_steering_counts(conn, &c) < 0)
1734 return -1;
1735 }
1736
1737 return iscsit_do_tx_data(conn, &c);
1738}
1739
1740void iscsit_collect_login_stats(
1741 struct iscsi_conn *conn,
1742 u8 status_class,
1743 u8 status_detail)
1744{
1745 struct iscsi_param *intrname = NULL;
1746 struct iscsi_tiqn *tiqn;
1747 struct iscsi_login_stats *ls;
1748
1749 tiqn = iscsit_snmp_get_tiqn(conn);
1750 if (!tiqn)
1751 return;
1752
1753 ls = &tiqn->login_stats;
1754
1755 spin_lock(&ls->lock);
1756 if (!strcmp(conn->login_ip, ls->last_intr_fail_ip_addr) &&
1757 ((get_jiffies_64() - ls->last_fail_time) < 10)) {
1758 /* We already have the failure info for this login */
1759 spin_unlock(&ls->lock);
1760 return;
1761 }
1762
1763 if (status_class == ISCSI_STATUS_CLS_SUCCESS)
1764 ls->accepts++;
1765 else if (status_class == ISCSI_STATUS_CLS_REDIRECT) {
1766 ls->redirects++;
1767 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT;
1768 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1769 (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) {
1770 ls->authenticate_fails++;
1771 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE;
1772 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1773 (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) {
1774 ls->authorize_fails++;
1775 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE;
1776 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1777 (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) {
1778 ls->negotiate_fails++;
1779 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE;
1780 } else {
1781 ls->other_fails++;
1782 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER;
1783 }
1784
1785 /* Save initiator name, ip address and time, if it is a failed login */
1786 if (status_class != ISCSI_STATUS_CLS_SUCCESS) {
1787 if (conn->param_list)
1788 intrname = iscsi_find_param_from_key(INITIATORNAME,
1789 conn->param_list);
1790 strcpy(ls->last_intr_fail_name,
1791 (intrname ? intrname->value : "Unknown"));
1792
1793 ls->last_intr_fail_ip_family = conn->sock->sk->sk_family;
1794 snprintf(ls->last_intr_fail_ip_addr, IPV6_ADDRESS_SPACE,
1795 "%s", conn->login_ip);
1796 ls->last_fail_time = get_jiffies_64();
1797 }
1798
1799 spin_unlock(&ls->lock);
1800}
1801
1802struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn)
1803{
1804 struct iscsi_portal_group *tpg;
1805
1806 if (!conn || !conn->sess)
1807 return NULL;
1808
1809 tpg = conn->sess->tpg;
1810 if (!tpg)
1811 return NULL;
1812
1813 if (!tpg->tpg_tiqn)
1814 return NULL;
1815
1816 return tpg->tpg_tiqn;
1817}
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