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1/*******************************************************************************
2 * This file contains the iSCSI Target specific utility functions.
3 *
4 * \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
5 *
6 * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
7 *
8 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 ******************************************************************************/
20
21#include <linux/list.h>
22#include <scsi/scsi_tcq.h>
23#include <scsi/iscsi_proto.h>
24#include <target/target_core_base.h>
25#include <target/target_core_transport.h>
26#include <target/target_core_tmr.h>
27#include <target/target_core_fabric_ops.h>
28#include <target/target_core_configfs.h>
29
30#include "iscsi_target_core.h"
31#include "iscsi_target_parameters.h"
32#include "iscsi_target_seq_pdu_list.h"
33#include "iscsi_target_datain_values.h"
34#include "iscsi_target_erl0.h"
35#include "iscsi_target_erl1.h"
36#include "iscsi_target_erl2.h"
37#include "iscsi_target_tpg.h"
38#include "iscsi_target_tq.h"
39#include "iscsi_target_util.h"
40#include "iscsi_target.h"
41
42#define PRINT_BUFF(buff, len) \
43{ \
44 int zzz; \
45 \
46 pr_debug("%d:\n", __LINE__); \
47 for (zzz = 0; zzz < len; zzz++) { \
48 if (zzz % 16 == 0) { \
49 if (zzz) \
50 pr_debug("\n"); \
51 pr_debug("%4i: ", zzz); \
52 } \
53 pr_debug("%02x ", (unsigned char) (buff)[zzz]); \
54 } \
55 if ((len + 1) % 16) \
56 pr_debug("\n"); \
57}
58
59extern struct list_head g_tiqn_list;
60extern spinlock_t tiqn_lock;
61
62/*
63 * Called with cmd->r2t_lock held.
64 */
65int iscsit_add_r2t_to_list(
66 struct iscsi_cmd *cmd,
67 u32 offset,
68 u32 xfer_len,
69 int recovery,
70 u32 r2t_sn)
71{
72 struct iscsi_r2t *r2t;
73
74 r2t = kmem_cache_zalloc(lio_r2t_cache, GFP_ATOMIC);
75 if (!r2t) {
76 pr_err("Unable to allocate memory for struct iscsi_r2t.\n");
77 return -1;
78 }
79 INIT_LIST_HEAD(&r2t->r2t_list);
80
81 r2t->recovery_r2t = recovery;
82 r2t->r2t_sn = (!r2t_sn) ? cmd->r2t_sn++ : r2t_sn;
83 r2t->offset = offset;
84 r2t->xfer_len = xfer_len;
85 list_add_tail(&r2t->r2t_list, &cmd->cmd_r2t_list);
86 spin_unlock_bh(&cmd->r2t_lock);
87
88 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, ISTATE_SEND_R2T);
89
90 spin_lock_bh(&cmd->r2t_lock);
91 return 0;
92}
93
94struct iscsi_r2t *iscsit_get_r2t_for_eos(
95 struct iscsi_cmd *cmd,
96 u32 offset,
97 u32 length)
98{
99 struct iscsi_r2t *r2t;
100
101 spin_lock_bh(&cmd->r2t_lock);
102 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
103 if ((r2t->offset <= offset) &&
104 (r2t->offset + r2t->xfer_len) >= (offset + length)) {
105 spin_unlock_bh(&cmd->r2t_lock);
106 return r2t;
107 }
108 }
109 spin_unlock_bh(&cmd->r2t_lock);
110
111 pr_err("Unable to locate R2T for Offset: %u, Length:"
112 " %u\n", offset, length);
113 return NULL;
114}
115
116struct iscsi_r2t *iscsit_get_r2t_from_list(struct iscsi_cmd *cmd)
117{
118 struct iscsi_r2t *r2t;
119
120 spin_lock_bh(&cmd->r2t_lock);
121 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
122 if (!r2t->sent_r2t) {
123 spin_unlock_bh(&cmd->r2t_lock);
124 return r2t;
125 }
126 }
127 spin_unlock_bh(&cmd->r2t_lock);
128
129 pr_err("Unable to locate next R2T to send for ITT:"
130 " 0x%08x.\n", cmd->init_task_tag);
131 return NULL;
132}
133
134/*
135 * Called with cmd->r2t_lock held.
136 */
137void iscsit_free_r2t(struct iscsi_r2t *r2t, struct iscsi_cmd *cmd)
138{
139 list_del(&r2t->r2t_list);
140 kmem_cache_free(lio_r2t_cache, r2t);
141}
142
143void iscsit_free_r2ts_from_list(struct iscsi_cmd *cmd)
144{
145 struct iscsi_r2t *r2t, *r2t_tmp;
146
147 spin_lock_bh(&cmd->r2t_lock);
148 list_for_each_entry_safe(r2t, r2t_tmp, &cmd->cmd_r2t_list, r2t_list)
149 iscsit_free_r2t(r2t, cmd);
150 spin_unlock_bh(&cmd->r2t_lock);
151}
152
153/*
154 * May be called from software interrupt (timer) context for allocating
155 * iSCSI NopINs.
156 */
157struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *conn, gfp_t gfp_mask)
158{
159 struct iscsi_cmd *cmd;
160
161 cmd = kmem_cache_zalloc(lio_cmd_cache, gfp_mask);
162 if (!cmd) {
163 pr_err("Unable to allocate memory for struct iscsi_cmd.\n");
164 return NULL;
165 }
166
167 cmd->conn = conn;
168 INIT_LIST_HEAD(&cmd->i_list);
169 INIT_LIST_HEAD(&cmd->datain_list);
170 INIT_LIST_HEAD(&cmd->cmd_r2t_list);
171 init_completion(&cmd->reject_comp);
172 spin_lock_init(&cmd->datain_lock);
173 spin_lock_init(&cmd->dataout_timeout_lock);
174 spin_lock_init(&cmd->istate_lock);
175 spin_lock_init(&cmd->error_lock);
176 spin_lock_init(&cmd->r2t_lock);
177
178 return cmd;
179}
180
181/*
182 * Called from iscsi_handle_scsi_cmd()
183 */
184struct iscsi_cmd *iscsit_allocate_se_cmd(
185 struct iscsi_conn *conn,
186 u32 data_length,
187 int data_direction,
188 int iscsi_task_attr)
189{
190 struct iscsi_cmd *cmd;
191 struct se_cmd *se_cmd;
192 int sam_task_attr;
193
194 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
195 if (!cmd)
196 return NULL;
197
198 cmd->data_direction = data_direction;
199 cmd->data_length = data_length;
200 /*
201 * Figure out the SAM Task Attribute for the incoming SCSI CDB
202 */
203 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
204 (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
205 sam_task_attr = MSG_SIMPLE_TAG;
206 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
207 sam_task_attr = MSG_ORDERED_TAG;
208 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
209 sam_task_attr = MSG_HEAD_TAG;
210 else if (iscsi_task_attr == ISCSI_ATTR_ACA)
211 sam_task_attr = MSG_ACA_TAG;
212 else {
213 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
214 " MSG_SIMPLE_TAG\n", iscsi_task_attr);
215 sam_task_attr = MSG_SIMPLE_TAG;
216 }
217
218 se_cmd = &cmd->se_cmd;
219 /*
220 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
221 */
222 transport_init_se_cmd(se_cmd, &lio_target_fabric_configfs->tf_ops,
223 conn->sess->se_sess, data_length, data_direction,
224 sam_task_attr, &cmd->sense_buffer[0]);
225 return cmd;
226}
227
228struct iscsi_cmd *iscsit_allocate_se_cmd_for_tmr(
229 struct iscsi_conn *conn,
230 u8 function)
231{
232 struct iscsi_cmd *cmd;
233 struct se_cmd *se_cmd;
234 u8 tcm_function;
235
236 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
237 if (!cmd)
238 return NULL;
239
240 cmd->data_direction = DMA_NONE;
241
242 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
243 if (!cmd->tmr_req) {
244 pr_err("Unable to allocate memory for"
245 " Task Management command!\n");
246 goto out;
247 }
248 /*
249 * TASK_REASSIGN for ERL=2 / connection stays inside of
250 * LIO-Target $FABRIC_MOD
251 */
252 if (function == ISCSI_TM_FUNC_TASK_REASSIGN)
253 return cmd;
254
255 se_cmd = &cmd->se_cmd;
256 /*
257 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
258 */
259 transport_init_se_cmd(se_cmd, &lio_target_fabric_configfs->tf_ops,
260 conn->sess->se_sess, 0, DMA_NONE,
261 MSG_SIMPLE_TAG, &cmd->sense_buffer[0]);
262
263 switch (function) {
264 case ISCSI_TM_FUNC_ABORT_TASK:
265 tcm_function = TMR_ABORT_TASK;
266 break;
267 case ISCSI_TM_FUNC_ABORT_TASK_SET:
268 tcm_function = TMR_ABORT_TASK_SET;
269 break;
270 case ISCSI_TM_FUNC_CLEAR_ACA:
271 tcm_function = TMR_CLEAR_ACA;
272 break;
273 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
274 tcm_function = TMR_CLEAR_TASK_SET;
275 break;
276 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
277 tcm_function = TMR_LUN_RESET;
278 break;
279 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
280 tcm_function = TMR_TARGET_WARM_RESET;
281 break;
282 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
283 tcm_function = TMR_TARGET_COLD_RESET;
284 break;
285 default:
286 pr_err("Unknown iSCSI TMR Function:"
287 " 0x%02x\n", function);
288 goto out;
289 }
290
291 se_cmd->se_tmr_req = core_tmr_alloc_req(se_cmd,
292 (void *)cmd->tmr_req, tcm_function);
293 if (!se_cmd->se_tmr_req)
294 goto out;
295
296 cmd->tmr_req->se_tmr_req = se_cmd->se_tmr_req;
297
298 return cmd;
299out:
300 iscsit_release_cmd(cmd);
301 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 * Setup conn->if_marker and conn->of_marker values based upon
879 * the initial marker-less interval. (see iSCSI v19 A.2)
880 */
881int iscsit_set_sync_and_steering_values(struct iscsi_conn *conn)
882{
883 int login_ifmarker_count = 0, login_ofmarker_count = 0, next_marker = 0;
884 /*
885 * IFMarkInt and OFMarkInt are negotiated as 32-bit words.
886 */
887 u32 IFMarkInt = (conn->conn_ops->IFMarkInt * 4);
888 u32 OFMarkInt = (conn->conn_ops->OFMarkInt * 4);
889
890 if (conn->conn_ops->OFMarker) {
891 /*
892 * Account for the first Login Command received not
893 * via iscsi_recv_msg().
894 */
895 conn->of_marker += ISCSI_HDR_LEN;
896 if (conn->of_marker <= OFMarkInt) {
897 conn->of_marker = (OFMarkInt - conn->of_marker);
898 } else {
899 login_ofmarker_count = (conn->of_marker / OFMarkInt);
900 next_marker = (OFMarkInt * (login_ofmarker_count + 1)) +
901 (login_ofmarker_count * MARKER_SIZE);
902 conn->of_marker = (next_marker - conn->of_marker);
903 }
904 conn->of_marker_offset = 0;
905 pr_debug("Setting OFMarker value to %u based on Initial"
906 " Markerless Interval.\n", conn->of_marker);
907 }
908
909 if (conn->conn_ops->IFMarker) {
910 if (conn->if_marker <= IFMarkInt) {
911 conn->if_marker = (IFMarkInt - conn->if_marker);
912 } else {
913 login_ifmarker_count = (conn->if_marker / IFMarkInt);
914 next_marker = (IFMarkInt * (login_ifmarker_count + 1)) +
915 (login_ifmarker_count * MARKER_SIZE);
916 conn->if_marker = (next_marker - conn->if_marker);
917 }
918 pr_debug("Setting IFMarker value to %u based on Initial"
919 " Markerless Interval.\n", conn->if_marker);
920 }
921
922 return 0;
923}
924
925struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid)
926{
927 struct iscsi_conn *conn;
928
929 spin_lock_bh(&sess->conn_lock);
930 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
931 if ((conn->cid == cid) &&
932 (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) {
933 iscsit_inc_conn_usage_count(conn);
934 spin_unlock_bh(&sess->conn_lock);
935 return conn;
936 }
937 }
938 spin_unlock_bh(&sess->conn_lock);
939
940 return NULL;
941}
942
943struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid)
944{
945 struct iscsi_conn *conn;
946
947 spin_lock_bh(&sess->conn_lock);
948 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
949 if (conn->cid == cid) {
950 iscsit_inc_conn_usage_count(conn);
951 spin_lock(&conn->state_lock);
952 atomic_set(&conn->connection_wait_rcfr, 1);
953 spin_unlock(&conn->state_lock);
954 spin_unlock_bh(&sess->conn_lock);
955 return conn;
956 }
957 }
958 spin_unlock_bh(&sess->conn_lock);
959
960 return NULL;
961}
962
963void iscsit_check_conn_usage_count(struct iscsi_conn *conn)
964{
965 spin_lock_bh(&conn->conn_usage_lock);
966 if (conn->conn_usage_count != 0) {
967 conn->conn_waiting_on_uc = 1;
968 spin_unlock_bh(&conn->conn_usage_lock);
969
970 wait_for_completion(&conn->conn_waiting_on_uc_comp);
971 return;
972 }
973 spin_unlock_bh(&conn->conn_usage_lock);
974}
975
976void iscsit_dec_conn_usage_count(struct iscsi_conn *conn)
977{
978 spin_lock_bh(&conn->conn_usage_lock);
979 conn->conn_usage_count--;
980
981 if (!conn->conn_usage_count && conn->conn_waiting_on_uc)
982 complete(&conn->conn_waiting_on_uc_comp);
983
984 spin_unlock_bh(&conn->conn_usage_lock);
985}
986
987void iscsit_inc_conn_usage_count(struct iscsi_conn *conn)
988{
989 spin_lock_bh(&conn->conn_usage_lock);
990 conn->conn_usage_count++;
991 spin_unlock_bh(&conn->conn_usage_lock);
992}
993
994static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response)
995{
996 u8 state;
997 struct iscsi_cmd *cmd;
998
999 cmd = iscsit_allocate_cmd(conn, GFP_ATOMIC);
1000 if (!cmd)
1001 return -1;
1002
1003 cmd->iscsi_opcode = ISCSI_OP_NOOP_IN;
1004 state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE :
1005 ISTATE_SEND_NOPIN_NO_RESPONSE;
1006 cmd->init_task_tag = 0xFFFFFFFF;
1007 spin_lock_bh(&conn->sess->ttt_lock);
1008 cmd->targ_xfer_tag = (want_response) ? conn->sess->targ_xfer_tag++ :
1009 0xFFFFFFFF;
1010 if (want_response && (cmd->targ_xfer_tag == 0xFFFFFFFF))
1011 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
1012 spin_unlock_bh(&conn->sess->ttt_lock);
1013
1014 spin_lock_bh(&conn->cmd_lock);
1015 list_add_tail(&cmd->i_list, &conn->conn_cmd_list);
1016 spin_unlock_bh(&conn->cmd_lock);
1017
1018 if (want_response)
1019 iscsit_start_nopin_response_timer(conn);
1020 iscsit_add_cmd_to_immediate_queue(cmd, conn, state);
1021
1022 return 0;
1023}
1024
1025static void iscsit_handle_nopin_response_timeout(unsigned long data)
1026{
1027 struct iscsi_conn *conn = (struct iscsi_conn *) data;
1028
1029 iscsit_inc_conn_usage_count(conn);
1030
1031 spin_lock_bh(&conn->nopin_timer_lock);
1032 if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) {
1033 spin_unlock_bh(&conn->nopin_timer_lock);
1034 iscsit_dec_conn_usage_count(conn);
1035 return;
1036 }
1037
1038 pr_debug("Did not receive response to NOPIN on CID: %hu on"
1039 " SID: %u, failing connection.\n", conn->cid,
1040 conn->sess->sid);
1041 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
1042 spin_unlock_bh(&conn->nopin_timer_lock);
1043
1044 {
1045 struct iscsi_portal_group *tpg = conn->sess->tpg;
1046 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
1047
1048 if (tiqn) {
1049 spin_lock_bh(&tiqn->sess_err_stats.lock);
1050 strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
1051 (void *)conn->sess->sess_ops->InitiatorName);
1052 tiqn->sess_err_stats.last_sess_failure_type =
1053 ISCSI_SESS_ERR_CXN_TIMEOUT;
1054 tiqn->sess_err_stats.cxn_timeout_errors++;
1055 conn->sess->conn_timeout_errors++;
1056 spin_unlock_bh(&tiqn->sess_err_stats.lock);
1057 }
1058 }
1059
1060 iscsit_cause_connection_reinstatement(conn, 0);
1061 iscsit_dec_conn_usage_count(conn);
1062}
1063
1064void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn)
1065{
1066 struct iscsi_session *sess = conn->sess;
1067 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1068
1069 spin_lock_bh(&conn->nopin_timer_lock);
1070 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
1071 spin_unlock_bh(&conn->nopin_timer_lock);
1072 return;
1073 }
1074
1075 mod_timer(&conn->nopin_response_timer,
1076 (get_jiffies_64() + na->nopin_response_timeout * HZ));
1077 spin_unlock_bh(&conn->nopin_timer_lock);
1078}
1079
1080/*
1081 * Called with conn->nopin_timer_lock held.
1082 */
1083void iscsit_start_nopin_response_timer(struct iscsi_conn *conn)
1084{
1085 struct iscsi_session *sess = conn->sess;
1086 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1087
1088 spin_lock_bh(&conn->nopin_timer_lock);
1089 if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) {
1090 spin_unlock_bh(&conn->nopin_timer_lock);
1091 return;
1092 }
1093
1094 init_timer(&conn->nopin_response_timer);
1095 conn->nopin_response_timer.expires =
1096 (get_jiffies_64() + na->nopin_response_timeout * HZ);
1097 conn->nopin_response_timer.data = (unsigned long)conn;
1098 conn->nopin_response_timer.function = iscsit_handle_nopin_response_timeout;
1099 conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP;
1100 conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING;
1101 add_timer(&conn->nopin_response_timer);
1102
1103 pr_debug("Started NOPIN Response Timer on CID: %d to %u"
1104 " seconds\n", conn->cid, na->nopin_response_timeout);
1105 spin_unlock_bh(&conn->nopin_timer_lock);
1106}
1107
1108void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn)
1109{
1110 spin_lock_bh(&conn->nopin_timer_lock);
1111 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
1112 spin_unlock_bh(&conn->nopin_timer_lock);
1113 return;
1114 }
1115 conn->nopin_response_timer_flags |= ISCSI_TF_STOP;
1116 spin_unlock_bh(&conn->nopin_timer_lock);
1117
1118 del_timer_sync(&conn->nopin_response_timer);
1119
1120 spin_lock_bh(&conn->nopin_timer_lock);
1121 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
1122 spin_unlock_bh(&conn->nopin_timer_lock);
1123}
1124
1125static void iscsit_handle_nopin_timeout(unsigned long data)
1126{
1127 struct iscsi_conn *conn = (struct iscsi_conn *) data;
1128
1129 iscsit_inc_conn_usage_count(conn);
1130
1131 spin_lock_bh(&conn->nopin_timer_lock);
1132 if (conn->nopin_timer_flags & ISCSI_TF_STOP) {
1133 spin_unlock_bh(&conn->nopin_timer_lock);
1134 iscsit_dec_conn_usage_count(conn);
1135 return;
1136 }
1137 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1138 spin_unlock_bh(&conn->nopin_timer_lock);
1139
1140 iscsit_add_nopin(conn, 1);
1141 iscsit_dec_conn_usage_count(conn);
1142}
1143
1144/*
1145 * Called with conn->nopin_timer_lock held.
1146 */
1147void __iscsit_start_nopin_timer(struct iscsi_conn *conn)
1148{
1149 struct iscsi_session *sess = conn->sess;
1150 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1151 /*
1152 * NOPIN timeout is disabled.
1153 */
1154 if (!na->nopin_timeout)
1155 return;
1156
1157 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING)
1158 return;
1159
1160 init_timer(&conn->nopin_timer);
1161 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1162 conn->nopin_timer.data = (unsigned long)conn;
1163 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1164 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1165 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1166 add_timer(&conn->nopin_timer);
1167
1168 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1169 " interval\n", conn->cid, na->nopin_timeout);
1170}
1171
1172void iscsit_start_nopin_timer(struct iscsi_conn *conn)
1173{
1174 struct iscsi_session *sess = conn->sess;
1175 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1176 /*
1177 * NOPIN timeout is disabled..
1178 */
1179 if (!na->nopin_timeout)
1180 return;
1181
1182 spin_lock_bh(&conn->nopin_timer_lock);
1183 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) {
1184 spin_unlock_bh(&conn->nopin_timer_lock);
1185 return;
1186 }
1187
1188 init_timer(&conn->nopin_timer);
1189 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1190 conn->nopin_timer.data = (unsigned long)conn;
1191 conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1192 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1193 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1194 add_timer(&conn->nopin_timer);
1195
1196 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1197 " interval\n", conn->cid, na->nopin_timeout);
1198 spin_unlock_bh(&conn->nopin_timer_lock);
1199}
1200
1201void iscsit_stop_nopin_timer(struct iscsi_conn *conn)
1202{
1203 spin_lock_bh(&conn->nopin_timer_lock);
1204 if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) {
1205 spin_unlock_bh(&conn->nopin_timer_lock);
1206 return;
1207 }
1208 conn->nopin_timer_flags |= ISCSI_TF_STOP;
1209 spin_unlock_bh(&conn->nopin_timer_lock);
1210
1211 del_timer_sync(&conn->nopin_timer);
1212
1213 spin_lock_bh(&conn->nopin_timer_lock);
1214 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1215 spin_unlock_bh(&conn->nopin_timer_lock);
1216}
1217
1218int iscsit_send_tx_data(
1219 struct iscsi_cmd *cmd,
1220 struct iscsi_conn *conn,
1221 int use_misc)
1222{
1223 int tx_sent, tx_size;
1224 u32 iov_count;
1225 struct kvec *iov;
1226
1227send_data:
1228 tx_size = cmd->tx_size;
1229
1230 if (!use_misc) {
1231 iov = &cmd->iov_data[0];
1232 iov_count = cmd->iov_data_count;
1233 } else {
1234 iov = &cmd->iov_misc[0];
1235 iov_count = cmd->iov_misc_count;
1236 }
1237
1238 tx_sent = tx_data(conn, &iov[0], iov_count, tx_size);
1239 if (tx_size != tx_sent) {
1240 if (tx_sent == -EAGAIN) {
1241 pr_err("tx_data() returned -EAGAIN\n");
1242 goto send_data;
1243 } else
1244 return -1;
1245 }
1246 cmd->tx_size = 0;
1247
1248 return 0;
1249}
1250
1251int iscsit_fe_sendpage_sg(
1252 struct iscsi_cmd *cmd,
1253 struct iscsi_conn *conn)
1254{
1255 struct scatterlist *sg = cmd->first_data_sg;
1256 struct kvec iov;
1257 u32 tx_hdr_size, data_len;
1258 u32 offset = cmd->first_data_sg_off;
1259 int tx_sent, iov_off;
1260
1261send_hdr:
1262 tx_hdr_size = ISCSI_HDR_LEN;
1263 if (conn->conn_ops->HeaderDigest)
1264 tx_hdr_size += ISCSI_CRC_LEN;
1265
1266 iov.iov_base = cmd->pdu;
1267 iov.iov_len = tx_hdr_size;
1268
1269 tx_sent = tx_data(conn, &iov, 1, tx_hdr_size);
1270 if (tx_hdr_size != tx_sent) {
1271 if (tx_sent == -EAGAIN) {
1272 pr_err("tx_data() returned -EAGAIN\n");
1273 goto send_hdr;
1274 }
1275 return -1;
1276 }
1277
1278 data_len = cmd->tx_size - tx_hdr_size - cmd->padding;
1279 /*
1280 * Set iov_off used by padding and data digest tx_data() calls below
1281 * in order to determine proper offset into cmd->iov_data[]
1282 */
1283 if (conn->conn_ops->DataDigest) {
1284 data_len -= ISCSI_CRC_LEN;
1285 if (cmd->padding)
1286 iov_off = (cmd->iov_data_count - 2);
1287 else
1288 iov_off = (cmd->iov_data_count - 1);
1289 } else {
1290 iov_off = (cmd->iov_data_count - 1);
1291 }
1292 /*
1293 * Perform sendpage() for each page in the scatterlist
1294 */
1295 while (data_len) {
1296 u32 space = (sg->length - offset);
1297 u32 sub_len = min_t(u32, data_len, space);
1298send_pg:
1299 tx_sent = conn->sock->ops->sendpage(conn->sock,
1300 sg_page(sg), sg->offset + offset, sub_len, 0);
1301 if (tx_sent != sub_len) {
1302 if (tx_sent == -EAGAIN) {
1303 pr_err("tcp_sendpage() returned"
1304 " -EAGAIN\n");
1305 goto send_pg;
1306 }
1307
1308 pr_err("tcp_sendpage() failure: %d\n",
1309 tx_sent);
1310 return -1;
1311 }
1312
1313 data_len -= sub_len;
1314 offset = 0;
1315 sg = sg_next(sg);
1316 }
1317
1318send_padding:
1319 if (cmd->padding) {
1320 struct kvec *iov_p = &cmd->iov_data[iov_off++];
1321
1322 tx_sent = tx_data(conn, iov_p, 1, cmd->padding);
1323 if (cmd->padding != tx_sent) {
1324 if (tx_sent == -EAGAIN) {
1325 pr_err("tx_data() returned -EAGAIN\n");
1326 goto send_padding;
1327 }
1328 return -1;
1329 }
1330 }
1331
1332send_datacrc:
1333 if (conn->conn_ops->DataDigest) {
1334 struct kvec *iov_d = &cmd->iov_data[iov_off];
1335
1336 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN);
1337 if (ISCSI_CRC_LEN != tx_sent) {
1338 if (tx_sent == -EAGAIN) {
1339 pr_err("tx_data() returned -EAGAIN\n");
1340 goto send_datacrc;
1341 }
1342 return -1;
1343 }
1344 }
1345
1346 return 0;
1347}
1348
1349/*
1350 * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU
1351 * back to the Initiator when an expection condition occurs with the
1352 * errors set in status_class and status_detail.
1353 *
1354 * Parameters: iSCSI Connection, Status Class, Status Detail.
1355 * Returns: 0 on success, -1 on error.
1356 */
1357int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail)
1358{
1359 u8 iscsi_hdr[ISCSI_HDR_LEN];
1360 int err;
1361 struct kvec iov;
1362 struct iscsi_login_rsp *hdr;
1363
1364 iscsit_collect_login_stats(conn, status_class, status_detail);
1365
1366 memset(&iov, 0, sizeof(struct kvec));
1367 memset(&iscsi_hdr, 0x0, ISCSI_HDR_LEN);
1368
1369 hdr = (struct iscsi_login_rsp *)&iscsi_hdr;
1370 hdr->opcode = ISCSI_OP_LOGIN_RSP;
1371 hdr->status_class = status_class;
1372 hdr->status_detail = status_detail;
1373 hdr->itt = cpu_to_be32(conn->login_itt);
1374
1375 iov.iov_base = &iscsi_hdr;
1376 iov.iov_len = ISCSI_HDR_LEN;
1377
1378 PRINT_BUFF(iscsi_hdr, ISCSI_HDR_LEN);
1379
1380 err = tx_data(conn, &iov, 1, ISCSI_HDR_LEN);
1381 if (err != ISCSI_HDR_LEN) {
1382 pr_err("tx_data returned less than expected\n");
1383 return -1;
1384 }
1385
1386 return 0;
1387}
1388
1389void iscsit_print_session_params(struct iscsi_session *sess)
1390{
1391 struct iscsi_conn *conn;
1392
1393 pr_debug("-----------------------------[Session Params for"
1394 " SID: %u]-----------------------------\n", sess->sid);
1395 spin_lock_bh(&sess->conn_lock);
1396 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
1397 iscsi_dump_conn_ops(conn->conn_ops);
1398 spin_unlock_bh(&sess->conn_lock);
1399
1400 iscsi_dump_sess_ops(sess->sess_ops);
1401}
1402
1403static int iscsit_do_rx_data(
1404 struct iscsi_conn *conn,
1405 struct iscsi_data_count *count)
1406{
1407 int data = count->data_length, rx_loop = 0, total_rx = 0, iov_len;
1408 struct kvec *iov_p;
1409 struct msghdr msg;
1410
1411 if (!conn || !conn->sock || !conn->conn_ops)
1412 return -1;
1413
1414 memset(&msg, 0, sizeof(struct msghdr));
1415
1416 iov_p = count->iov;
1417 iov_len = count->iov_count;
1418
1419 while (total_rx < data) {
1420 rx_loop = kernel_recvmsg(conn->sock, &msg, iov_p, iov_len,
1421 (data - total_rx), MSG_WAITALL);
1422 if (rx_loop <= 0) {
1423 pr_debug("rx_loop: %d total_rx: %d\n",
1424 rx_loop, total_rx);
1425 return rx_loop;
1426 }
1427 total_rx += rx_loop;
1428 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n",
1429 rx_loop, total_rx, data);
1430 }
1431
1432 return total_rx;
1433}
1434
1435static int iscsit_do_tx_data(
1436 struct iscsi_conn *conn,
1437 struct iscsi_data_count *count)
1438{
1439 int data = count->data_length, total_tx = 0, tx_loop = 0, iov_len;
1440 struct kvec *iov_p;
1441 struct msghdr msg;
1442
1443 if (!conn || !conn->sock || !conn->conn_ops)
1444 return -1;
1445
1446 if (data <= 0) {
1447 pr_err("Data length is: %d\n", data);
1448 return -1;
1449 }
1450
1451 memset(&msg, 0, sizeof(struct msghdr));
1452
1453 iov_p = count->iov;
1454 iov_len = count->iov_count;
1455
1456 while (total_tx < data) {
1457 tx_loop = kernel_sendmsg(conn->sock, &msg, iov_p, iov_len,
1458 (data - total_tx));
1459 if (tx_loop <= 0) {
1460 pr_debug("tx_loop: %d total_tx %d\n",
1461 tx_loop, total_tx);
1462 return tx_loop;
1463 }
1464 total_tx += tx_loop;
1465 pr_debug("tx_loop: %d, total_tx: %d, data: %d\n",
1466 tx_loop, total_tx, data);
1467 }
1468
1469 return total_tx;
1470}
1471
1472int rx_data(
1473 struct iscsi_conn *conn,
1474 struct kvec *iov,
1475 int iov_count,
1476 int data)
1477{
1478 struct iscsi_data_count c;
1479
1480 if (!conn || !conn->sock || !conn->conn_ops)
1481 return -1;
1482
1483 memset(&c, 0, sizeof(struct iscsi_data_count));
1484 c.iov = iov;
1485 c.iov_count = iov_count;
1486 c.data_length = data;
1487 c.type = ISCSI_RX_DATA;
1488
1489 return iscsit_do_rx_data(conn, &c);
1490}
1491
1492int tx_data(
1493 struct iscsi_conn *conn,
1494 struct kvec *iov,
1495 int iov_count,
1496 int data)
1497{
1498 struct iscsi_data_count c;
1499
1500 if (!conn || !conn->sock || !conn->conn_ops)
1501 return -1;
1502
1503 memset(&c, 0, sizeof(struct iscsi_data_count));
1504 c.iov = iov;
1505 c.iov_count = iov_count;
1506 c.data_length = data;
1507 c.type = ISCSI_TX_DATA;
1508
1509 return iscsit_do_tx_data(conn, &c);
1510}
1511
1512void iscsit_collect_login_stats(
1513 struct iscsi_conn *conn,
1514 u8 status_class,
1515 u8 status_detail)
1516{
1517 struct iscsi_param *intrname = NULL;
1518 struct iscsi_tiqn *tiqn;
1519 struct iscsi_login_stats *ls;
1520
1521 tiqn = iscsit_snmp_get_tiqn(conn);
1522 if (!tiqn)
1523 return;
1524
1525 ls = &tiqn->login_stats;
1526
1527 spin_lock(&ls->lock);
1528 if (!strcmp(conn->login_ip, ls->last_intr_fail_ip_addr) &&
1529 ((get_jiffies_64() - ls->last_fail_time) < 10)) {
1530 /* We already have the failure info for this login */
1531 spin_unlock(&ls->lock);
1532 return;
1533 }
1534
1535 if (status_class == ISCSI_STATUS_CLS_SUCCESS)
1536 ls->accepts++;
1537 else if (status_class == ISCSI_STATUS_CLS_REDIRECT) {
1538 ls->redirects++;
1539 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT;
1540 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1541 (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) {
1542 ls->authenticate_fails++;
1543 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE;
1544 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1545 (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) {
1546 ls->authorize_fails++;
1547 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE;
1548 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1549 (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) {
1550 ls->negotiate_fails++;
1551 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE;
1552 } else {
1553 ls->other_fails++;
1554 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER;
1555 }
1556
1557 /* Save initiator name, ip address and time, if it is a failed login */
1558 if (status_class != ISCSI_STATUS_CLS_SUCCESS) {
1559 if (conn->param_list)
1560 intrname = iscsi_find_param_from_key(INITIATORNAME,
1561 conn->param_list);
1562 strcpy(ls->last_intr_fail_name,
1563 (intrname ? intrname->value : "Unknown"));
1564
1565 ls->last_intr_fail_ip_family = conn->sock->sk->sk_family;
1566 snprintf(ls->last_intr_fail_ip_addr, IPV6_ADDRESS_SPACE,
1567 "%s", conn->login_ip);
1568 ls->last_fail_time = get_jiffies_64();
1569 }
1570
1571 spin_unlock(&ls->lock);
1572}
1573
1574struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn)
1575{
1576 struct iscsi_portal_group *tpg;
1577
1578 if (!conn || !conn->sess)
1579 return NULL;
1580
1581 tpg = conn->sess->tpg;
1582 if (!tpg)
1583 return NULL;
1584
1585 if (!tpg->tpg_tiqn)
1586 return NULL;
1587
1588 return tpg->tpg_tiqn;
1589}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*******************************************************************************
3 * This file contains the iSCSI Target specific utility functions.
4 *
5 * (c) Copyright 2007-2013 Datera, Inc.
6 *
7 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
8 *
9 ******************************************************************************/
10
11#include <linux/list.h>
12#include <linux/sched/signal.h>
13#include <net/ipv6.h> /* ipv6_addr_equal() */
14#include <scsi/scsi_tcq.h>
15#include <scsi/iscsi_proto.h>
16#include <target/target_core_base.h>
17#include <target/target_core_fabric.h>
18#include <target/iscsi/iscsi_transport.h>
19
20#include <target/iscsi/iscsi_target_core.h>
21#include "iscsi_target_parameters.h"
22#include "iscsi_target_seq_pdu_list.h"
23#include "iscsi_target_datain_values.h"
24#include "iscsi_target_erl0.h"
25#include "iscsi_target_erl1.h"
26#include "iscsi_target_erl2.h"
27#include "iscsi_target_tpg.h"
28#include "iscsi_target_util.h"
29#include "iscsi_target.h"
30
31extern struct list_head g_tiqn_list;
32extern spinlock_t tiqn_lock;
33
34int iscsit_add_r2t_to_list(
35 struct iscsit_cmd *cmd,
36 u32 offset,
37 u32 xfer_len,
38 int recovery,
39 u32 r2t_sn)
40{
41 struct iscsi_r2t *r2t;
42
43 lockdep_assert_held(&cmd->r2t_lock);
44
45 WARN_ON_ONCE((s32)xfer_len < 0);
46
47 r2t = kmem_cache_zalloc(lio_r2t_cache, GFP_ATOMIC);
48 if (!r2t) {
49 pr_err("Unable to allocate memory for struct iscsi_r2t.\n");
50 return -1;
51 }
52 INIT_LIST_HEAD(&r2t->r2t_list);
53
54 r2t->recovery_r2t = recovery;
55 r2t->r2t_sn = (!r2t_sn) ? cmd->r2t_sn++ : r2t_sn;
56 r2t->offset = offset;
57 r2t->xfer_len = xfer_len;
58 list_add_tail(&r2t->r2t_list, &cmd->cmd_r2t_list);
59 spin_unlock_bh(&cmd->r2t_lock);
60
61 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, ISTATE_SEND_R2T);
62
63 spin_lock_bh(&cmd->r2t_lock);
64 return 0;
65}
66
67struct iscsi_r2t *iscsit_get_r2t_for_eos(
68 struct iscsit_cmd *cmd,
69 u32 offset,
70 u32 length)
71{
72 struct iscsi_r2t *r2t;
73
74 spin_lock_bh(&cmd->r2t_lock);
75 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
76 if ((r2t->offset <= offset) &&
77 (r2t->offset + r2t->xfer_len) >= (offset + length)) {
78 spin_unlock_bh(&cmd->r2t_lock);
79 return r2t;
80 }
81 }
82 spin_unlock_bh(&cmd->r2t_lock);
83
84 pr_err("Unable to locate R2T for Offset: %u, Length:"
85 " %u\n", offset, length);
86 return NULL;
87}
88
89struct iscsi_r2t *iscsit_get_r2t_from_list(struct iscsit_cmd *cmd)
90{
91 struct iscsi_r2t *r2t;
92
93 spin_lock_bh(&cmd->r2t_lock);
94 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
95 if (!r2t->sent_r2t) {
96 spin_unlock_bh(&cmd->r2t_lock);
97 return r2t;
98 }
99 }
100 spin_unlock_bh(&cmd->r2t_lock);
101
102 pr_err("Unable to locate next R2T to send for ITT:"
103 " 0x%08x.\n", cmd->init_task_tag);
104 return NULL;
105}
106
107void iscsit_free_r2t(struct iscsi_r2t *r2t, struct iscsit_cmd *cmd)
108{
109 lockdep_assert_held(&cmd->r2t_lock);
110
111 list_del(&r2t->r2t_list);
112 kmem_cache_free(lio_r2t_cache, r2t);
113}
114
115void iscsit_free_r2ts_from_list(struct iscsit_cmd *cmd)
116{
117 struct iscsi_r2t *r2t, *r2t_tmp;
118
119 spin_lock_bh(&cmd->r2t_lock);
120 list_for_each_entry_safe(r2t, r2t_tmp, &cmd->cmd_r2t_list, r2t_list)
121 iscsit_free_r2t(r2t, cmd);
122 spin_unlock_bh(&cmd->r2t_lock);
123}
124
125static int iscsit_wait_for_tag(struct se_session *se_sess, int state, int *cpup)
126{
127 int tag = -1;
128 DEFINE_SBQ_WAIT(wait);
129 struct sbq_wait_state *ws;
130 struct sbitmap_queue *sbq;
131
132 if (state == TASK_RUNNING)
133 return tag;
134
135 sbq = &se_sess->sess_tag_pool;
136 ws = &sbq->ws[0];
137 for (;;) {
138 sbitmap_prepare_to_wait(sbq, ws, &wait, state);
139 if (signal_pending_state(state, current))
140 break;
141 tag = sbitmap_queue_get(sbq, cpup);
142 if (tag >= 0)
143 break;
144 schedule();
145 }
146
147 sbitmap_finish_wait(sbq, ws, &wait);
148 return tag;
149}
150
151/*
152 * May be called from software interrupt (timer) context for allocating
153 * iSCSI NopINs.
154 */
155struct iscsit_cmd *iscsit_allocate_cmd(struct iscsit_conn *conn, int state)
156{
157 struct iscsit_cmd *cmd;
158 struct se_session *se_sess = conn->sess->se_sess;
159 int size, tag, cpu;
160
161 tag = sbitmap_queue_get(&se_sess->sess_tag_pool, &cpu);
162 if (tag < 0)
163 tag = iscsit_wait_for_tag(se_sess, state, &cpu);
164 if (tag < 0)
165 return NULL;
166
167 size = sizeof(struct iscsit_cmd) + conn->conn_transport->priv_size;
168 cmd = (struct iscsit_cmd *)(se_sess->sess_cmd_map + (tag * size));
169 memset(cmd, 0, size);
170
171 cmd->se_cmd.map_tag = tag;
172 cmd->se_cmd.map_cpu = cpu;
173 cmd->conn = conn;
174 cmd->data_direction = DMA_NONE;
175 INIT_LIST_HEAD(&cmd->i_conn_node);
176 INIT_LIST_HEAD(&cmd->datain_list);
177 INIT_LIST_HEAD(&cmd->cmd_r2t_list);
178 spin_lock_init(&cmd->datain_lock);
179 spin_lock_init(&cmd->dataout_timeout_lock);
180 spin_lock_init(&cmd->istate_lock);
181 spin_lock_init(&cmd->error_lock);
182 spin_lock_init(&cmd->r2t_lock);
183 timer_setup(&cmd->dataout_timer, iscsit_handle_dataout_timeout, 0);
184
185 return cmd;
186}
187EXPORT_SYMBOL(iscsit_allocate_cmd);
188
189struct iscsi_seq *iscsit_get_seq_holder_for_datain(
190 struct iscsit_cmd *cmd,
191 u32 seq_send_order)
192{
193 u32 i;
194
195 for (i = 0; i < cmd->seq_count; i++)
196 if (cmd->seq_list[i].seq_send_order == seq_send_order)
197 return &cmd->seq_list[i];
198
199 return NULL;
200}
201
202struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsit_cmd *cmd)
203{
204 u32 i;
205
206 if (!cmd->seq_list) {
207 pr_err("struct iscsit_cmd->seq_list is NULL!\n");
208 return NULL;
209 }
210
211 for (i = 0; i < cmd->seq_count; i++) {
212 if (cmd->seq_list[i].type != SEQTYPE_NORMAL)
213 continue;
214 if (cmd->seq_list[i].seq_send_order == cmd->seq_send_order) {
215 cmd->seq_send_order++;
216 return &cmd->seq_list[i];
217 }
218 }
219
220 return NULL;
221}
222
223struct iscsi_r2t *iscsit_get_holder_for_r2tsn(
224 struct iscsit_cmd *cmd,
225 u32 r2t_sn)
226{
227 struct iscsi_r2t *r2t;
228
229 spin_lock_bh(&cmd->r2t_lock);
230 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
231 if (r2t->r2t_sn == r2t_sn) {
232 spin_unlock_bh(&cmd->r2t_lock);
233 return r2t;
234 }
235 }
236 spin_unlock_bh(&cmd->r2t_lock);
237
238 return NULL;
239}
240
241static inline int iscsit_check_received_cmdsn(struct iscsit_session *sess, u32 cmdsn)
242{
243 u32 max_cmdsn;
244 int ret;
245
246 /*
247 * This is the proper method of checking received CmdSN against
248 * ExpCmdSN and MaxCmdSN values, as well as accounting for out
249 * or order CmdSNs due to multiple connection sessions and/or
250 * CRC failures.
251 */
252 max_cmdsn = atomic_read(&sess->max_cmd_sn);
253 if (iscsi_sna_gt(cmdsn, max_cmdsn)) {
254 pr_err("Received CmdSN: 0x%08x is greater than"
255 " MaxCmdSN: 0x%08x, ignoring.\n", cmdsn, max_cmdsn);
256 ret = CMDSN_MAXCMDSN_OVERRUN;
257
258 } else if (cmdsn == sess->exp_cmd_sn) {
259 sess->exp_cmd_sn++;
260 pr_debug("Received CmdSN matches ExpCmdSN,"
261 " incremented ExpCmdSN to: 0x%08x\n",
262 sess->exp_cmd_sn);
263 ret = CMDSN_NORMAL_OPERATION;
264
265 } else if (iscsi_sna_gt(cmdsn, sess->exp_cmd_sn)) {
266 pr_debug("Received CmdSN: 0x%08x is greater"
267 " than ExpCmdSN: 0x%08x, not acknowledging.\n",
268 cmdsn, sess->exp_cmd_sn);
269 ret = CMDSN_HIGHER_THAN_EXP;
270
271 } else {
272 pr_err("Received CmdSN: 0x%08x is less than"
273 " ExpCmdSN: 0x%08x, ignoring.\n", cmdsn,
274 sess->exp_cmd_sn);
275 ret = CMDSN_LOWER_THAN_EXP;
276 }
277
278 return ret;
279}
280
281/*
282 * Commands may be received out of order if MC/S is in use.
283 * Ensure they are executed in CmdSN order.
284 */
285int iscsit_sequence_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
286 unsigned char *buf, __be32 cmdsn)
287{
288 int ret, cmdsn_ret;
289 bool reject = false;
290 u8 reason = ISCSI_REASON_BOOKMARK_NO_RESOURCES;
291
292 mutex_lock(&conn->sess->cmdsn_mutex);
293
294 cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, be32_to_cpu(cmdsn));
295 switch (cmdsn_ret) {
296 case CMDSN_NORMAL_OPERATION:
297 ret = iscsit_execute_cmd(cmd, 0);
298 if ((ret >= 0) && !list_empty(&conn->sess->sess_ooo_cmdsn_list))
299 iscsit_execute_ooo_cmdsns(conn->sess);
300 else if (ret < 0) {
301 reject = true;
302 ret = CMDSN_ERROR_CANNOT_RECOVER;
303 }
304 break;
305 case CMDSN_HIGHER_THAN_EXP:
306 ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, be32_to_cpu(cmdsn));
307 if (ret < 0) {
308 reject = true;
309 ret = CMDSN_ERROR_CANNOT_RECOVER;
310 break;
311 }
312 ret = CMDSN_HIGHER_THAN_EXP;
313 break;
314 case CMDSN_LOWER_THAN_EXP:
315 case CMDSN_MAXCMDSN_OVERRUN:
316 default:
317 cmd->i_state = ISTATE_REMOVE;
318 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
319 /*
320 * Existing callers for iscsit_sequence_cmd() will silently
321 * ignore commands with CMDSN_LOWER_THAN_EXP, so force this
322 * return for CMDSN_MAXCMDSN_OVERRUN as well..
323 */
324 ret = CMDSN_LOWER_THAN_EXP;
325 break;
326 }
327 mutex_unlock(&conn->sess->cmdsn_mutex);
328
329 if (reject)
330 iscsit_reject_cmd(cmd, reason, buf);
331
332 return ret;
333}
334EXPORT_SYMBOL(iscsit_sequence_cmd);
335
336int iscsit_check_unsolicited_dataout(struct iscsit_cmd *cmd, unsigned char *buf)
337{
338 struct iscsit_conn *conn = cmd->conn;
339 struct se_cmd *se_cmd = &cmd->se_cmd;
340 struct iscsi_data *hdr = (struct iscsi_data *) buf;
341 u32 payload_length = ntoh24(hdr->dlength);
342
343 if (conn->sess->sess_ops->InitialR2T) {
344 pr_err("Received unexpected unsolicited data"
345 " while InitialR2T=Yes, protocol error.\n");
346 transport_send_check_condition_and_sense(se_cmd,
347 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
348 return -1;
349 }
350
351 if ((cmd->first_burst_len + payload_length) >
352 conn->sess->sess_ops->FirstBurstLength) {
353 pr_err("Total %u bytes exceeds FirstBurstLength: %u"
354 " for this Unsolicited DataOut Burst.\n",
355 (cmd->first_burst_len + payload_length),
356 conn->sess->sess_ops->FirstBurstLength);
357 transport_send_check_condition_and_sense(se_cmd,
358 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
359 return -1;
360 }
361
362 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))
363 return 0;
364
365 if (((cmd->first_burst_len + payload_length) != cmd->se_cmd.data_length) &&
366 ((cmd->first_burst_len + payload_length) !=
367 conn->sess->sess_ops->FirstBurstLength)) {
368 pr_err("Unsolicited non-immediate data received %u"
369 " does not equal FirstBurstLength: %u, and does"
370 " not equal ExpXferLen %u.\n",
371 (cmd->first_burst_len + payload_length),
372 conn->sess->sess_ops->FirstBurstLength, cmd->se_cmd.data_length);
373 transport_send_check_condition_and_sense(se_cmd,
374 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
375 return -1;
376 }
377 return 0;
378}
379
380struct iscsit_cmd *iscsit_find_cmd_from_itt(
381 struct iscsit_conn *conn,
382 itt_t init_task_tag)
383{
384 struct iscsit_cmd *cmd;
385
386 spin_lock_bh(&conn->cmd_lock);
387 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
388 if (cmd->init_task_tag == init_task_tag) {
389 spin_unlock_bh(&conn->cmd_lock);
390 return cmd;
391 }
392 }
393 spin_unlock_bh(&conn->cmd_lock);
394
395 pr_err("Unable to locate ITT: 0x%08x on CID: %hu",
396 init_task_tag, conn->cid);
397 return NULL;
398}
399EXPORT_SYMBOL(iscsit_find_cmd_from_itt);
400
401struct iscsit_cmd *iscsit_find_cmd_from_itt_or_dump(
402 struct iscsit_conn *conn,
403 itt_t init_task_tag,
404 u32 length)
405{
406 struct iscsit_cmd *cmd;
407
408 spin_lock_bh(&conn->cmd_lock);
409 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
410 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT)
411 continue;
412 if (cmd->init_task_tag == init_task_tag) {
413 spin_unlock_bh(&conn->cmd_lock);
414 return cmd;
415 }
416 }
417 spin_unlock_bh(&conn->cmd_lock);
418
419 pr_err("Unable to locate ITT: 0x%08x on CID: %hu,"
420 " dumping payload\n", init_task_tag, conn->cid);
421 if (length)
422 iscsit_dump_data_payload(conn, length, 1);
423
424 return NULL;
425}
426EXPORT_SYMBOL(iscsit_find_cmd_from_itt_or_dump);
427
428struct iscsit_cmd *iscsit_find_cmd_from_ttt(
429 struct iscsit_conn *conn,
430 u32 targ_xfer_tag)
431{
432 struct iscsit_cmd *cmd = NULL;
433
434 spin_lock_bh(&conn->cmd_lock);
435 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
436 if (cmd->targ_xfer_tag == targ_xfer_tag) {
437 spin_unlock_bh(&conn->cmd_lock);
438 return cmd;
439 }
440 }
441 spin_unlock_bh(&conn->cmd_lock);
442
443 pr_err("Unable to locate TTT: 0x%08x on CID: %hu\n",
444 targ_xfer_tag, conn->cid);
445 return NULL;
446}
447
448int iscsit_find_cmd_for_recovery(
449 struct iscsit_session *sess,
450 struct iscsit_cmd **cmd_ptr,
451 struct iscsi_conn_recovery **cr_ptr,
452 itt_t init_task_tag)
453{
454 struct iscsit_cmd *cmd = NULL;
455 struct iscsi_conn_recovery *cr;
456 /*
457 * Scan through the inactive connection recovery list's command list.
458 * If init_task_tag matches the command is still alligent.
459 */
460 spin_lock(&sess->cr_i_lock);
461 list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) {
462 spin_lock(&cr->conn_recovery_cmd_lock);
463 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
464 if (cmd->init_task_tag == init_task_tag) {
465 spin_unlock(&cr->conn_recovery_cmd_lock);
466 spin_unlock(&sess->cr_i_lock);
467
468 *cr_ptr = cr;
469 *cmd_ptr = cmd;
470 return -2;
471 }
472 }
473 spin_unlock(&cr->conn_recovery_cmd_lock);
474 }
475 spin_unlock(&sess->cr_i_lock);
476 /*
477 * Scan through the active connection recovery list's command list.
478 * If init_task_tag matches the command is ready to be reassigned.
479 */
480 spin_lock(&sess->cr_a_lock);
481 list_for_each_entry(cr, &sess->cr_active_list, cr_list) {
482 spin_lock(&cr->conn_recovery_cmd_lock);
483 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
484 if (cmd->init_task_tag == init_task_tag) {
485 spin_unlock(&cr->conn_recovery_cmd_lock);
486 spin_unlock(&sess->cr_a_lock);
487
488 *cr_ptr = cr;
489 *cmd_ptr = cmd;
490 return 0;
491 }
492 }
493 spin_unlock(&cr->conn_recovery_cmd_lock);
494 }
495 spin_unlock(&sess->cr_a_lock);
496
497 return -1;
498}
499
500void iscsit_add_cmd_to_immediate_queue(
501 struct iscsit_cmd *cmd,
502 struct iscsit_conn *conn,
503 u8 state)
504{
505 struct iscsi_queue_req *qr;
506
507 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
508 if (!qr) {
509 pr_err("Unable to allocate memory for"
510 " struct iscsi_queue_req\n");
511 return;
512 }
513 INIT_LIST_HEAD(&qr->qr_list);
514 qr->cmd = cmd;
515 qr->state = state;
516
517 spin_lock_bh(&conn->immed_queue_lock);
518 list_add_tail(&qr->qr_list, &conn->immed_queue_list);
519 atomic_inc(&cmd->immed_queue_count);
520 atomic_set(&conn->check_immediate_queue, 1);
521 spin_unlock_bh(&conn->immed_queue_lock);
522
523 wake_up(&conn->queues_wq);
524}
525EXPORT_SYMBOL(iscsit_add_cmd_to_immediate_queue);
526
527struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsit_conn *conn)
528{
529 struct iscsi_queue_req *qr;
530
531 spin_lock_bh(&conn->immed_queue_lock);
532 if (list_empty(&conn->immed_queue_list)) {
533 spin_unlock_bh(&conn->immed_queue_lock);
534 return NULL;
535 }
536 qr = list_first_entry(&conn->immed_queue_list,
537 struct iscsi_queue_req, qr_list);
538
539 list_del(&qr->qr_list);
540 if (qr->cmd)
541 atomic_dec(&qr->cmd->immed_queue_count);
542 spin_unlock_bh(&conn->immed_queue_lock);
543
544 return qr;
545}
546
547static void iscsit_remove_cmd_from_immediate_queue(
548 struct iscsit_cmd *cmd,
549 struct iscsit_conn *conn)
550{
551 struct iscsi_queue_req *qr, *qr_tmp;
552
553 spin_lock_bh(&conn->immed_queue_lock);
554 if (!atomic_read(&cmd->immed_queue_count)) {
555 spin_unlock_bh(&conn->immed_queue_lock);
556 return;
557 }
558
559 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
560 if (qr->cmd != cmd)
561 continue;
562
563 atomic_dec(&qr->cmd->immed_queue_count);
564 list_del(&qr->qr_list);
565 kmem_cache_free(lio_qr_cache, qr);
566 }
567 spin_unlock_bh(&conn->immed_queue_lock);
568
569 if (atomic_read(&cmd->immed_queue_count)) {
570 pr_err("ITT: 0x%08x immed_queue_count: %d\n",
571 cmd->init_task_tag,
572 atomic_read(&cmd->immed_queue_count));
573 }
574}
575
576int iscsit_add_cmd_to_response_queue(
577 struct iscsit_cmd *cmd,
578 struct iscsit_conn *conn,
579 u8 state)
580{
581 struct iscsi_queue_req *qr;
582
583 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
584 if (!qr) {
585 pr_err("Unable to allocate memory for"
586 " struct iscsi_queue_req\n");
587 return -ENOMEM;
588 }
589 INIT_LIST_HEAD(&qr->qr_list);
590 qr->cmd = cmd;
591 qr->state = state;
592
593 spin_lock_bh(&conn->response_queue_lock);
594 list_add_tail(&qr->qr_list, &conn->response_queue_list);
595 atomic_inc(&cmd->response_queue_count);
596 spin_unlock_bh(&conn->response_queue_lock);
597
598 wake_up(&conn->queues_wq);
599 return 0;
600}
601
602struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsit_conn *conn)
603{
604 struct iscsi_queue_req *qr;
605
606 spin_lock_bh(&conn->response_queue_lock);
607 if (list_empty(&conn->response_queue_list)) {
608 spin_unlock_bh(&conn->response_queue_lock);
609 return NULL;
610 }
611
612 qr = list_first_entry(&conn->response_queue_list,
613 struct iscsi_queue_req, qr_list);
614
615 list_del(&qr->qr_list);
616 if (qr->cmd)
617 atomic_dec(&qr->cmd->response_queue_count);
618 spin_unlock_bh(&conn->response_queue_lock);
619
620 return qr;
621}
622
623static void iscsit_remove_cmd_from_response_queue(
624 struct iscsit_cmd *cmd,
625 struct iscsit_conn *conn)
626{
627 struct iscsi_queue_req *qr, *qr_tmp;
628
629 spin_lock_bh(&conn->response_queue_lock);
630 if (!atomic_read(&cmd->response_queue_count)) {
631 spin_unlock_bh(&conn->response_queue_lock);
632 return;
633 }
634
635 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
636 qr_list) {
637 if (qr->cmd != cmd)
638 continue;
639
640 atomic_dec(&qr->cmd->response_queue_count);
641 list_del(&qr->qr_list);
642 kmem_cache_free(lio_qr_cache, qr);
643 }
644 spin_unlock_bh(&conn->response_queue_lock);
645
646 if (atomic_read(&cmd->response_queue_count)) {
647 pr_err("ITT: 0x%08x response_queue_count: %d\n",
648 cmd->init_task_tag,
649 atomic_read(&cmd->response_queue_count));
650 }
651}
652
653bool iscsit_conn_all_queues_empty(struct iscsit_conn *conn)
654{
655 bool empty;
656
657 spin_lock_bh(&conn->immed_queue_lock);
658 empty = list_empty(&conn->immed_queue_list);
659 spin_unlock_bh(&conn->immed_queue_lock);
660
661 if (!empty)
662 return empty;
663
664 spin_lock_bh(&conn->response_queue_lock);
665 empty = list_empty(&conn->response_queue_list);
666 spin_unlock_bh(&conn->response_queue_lock);
667
668 return empty;
669}
670
671void iscsit_free_queue_reqs_for_conn(struct iscsit_conn *conn)
672{
673 struct iscsi_queue_req *qr, *qr_tmp;
674
675 spin_lock_bh(&conn->immed_queue_lock);
676 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
677 list_del(&qr->qr_list);
678 if (qr->cmd)
679 atomic_dec(&qr->cmd->immed_queue_count);
680
681 kmem_cache_free(lio_qr_cache, qr);
682 }
683 spin_unlock_bh(&conn->immed_queue_lock);
684
685 spin_lock_bh(&conn->response_queue_lock);
686 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
687 qr_list) {
688 list_del(&qr->qr_list);
689 if (qr->cmd)
690 atomic_dec(&qr->cmd->response_queue_count);
691
692 kmem_cache_free(lio_qr_cache, qr);
693 }
694 spin_unlock_bh(&conn->response_queue_lock);
695}
696
697void iscsit_release_cmd(struct iscsit_cmd *cmd)
698{
699 struct iscsit_session *sess;
700 struct se_cmd *se_cmd = &cmd->se_cmd;
701
702 WARN_ON(!list_empty(&cmd->i_conn_node));
703
704 if (cmd->conn)
705 sess = cmd->conn->sess;
706 else
707 sess = cmd->sess;
708
709 BUG_ON(!sess || !sess->se_sess);
710
711 kfree(cmd->buf_ptr);
712 kfree(cmd->pdu_list);
713 kfree(cmd->seq_list);
714 kfree(cmd->tmr_req);
715 kfree(cmd->overflow_buf);
716 kfree(cmd->iov_data);
717 kfree(cmd->text_in_ptr);
718
719 target_free_tag(sess->se_sess, se_cmd);
720}
721EXPORT_SYMBOL(iscsit_release_cmd);
722
723void __iscsit_free_cmd(struct iscsit_cmd *cmd, bool check_queues)
724{
725 struct iscsit_conn *conn = cmd->conn;
726
727 WARN_ON(!list_empty(&cmd->i_conn_node));
728
729 if (cmd->data_direction == DMA_TO_DEVICE) {
730 iscsit_stop_dataout_timer(cmd);
731 iscsit_free_r2ts_from_list(cmd);
732 }
733 if (cmd->data_direction == DMA_FROM_DEVICE)
734 iscsit_free_all_datain_reqs(cmd);
735
736 if (conn && check_queues) {
737 iscsit_remove_cmd_from_immediate_queue(cmd, conn);
738 iscsit_remove_cmd_from_response_queue(cmd, conn);
739 }
740
741 if (conn && conn->conn_transport->iscsit_unmap_cmd)
742 conn->conn_transport->iscsit_unmap_cmd(conn, cmd);
743}
744
745void iscsit_free_cmd(struct iscsit_cmd *cmd, bool shutdown)
746{
747 struct se_cmd *se_cmd = cmd->se_cmd.se_tfo ? &cmd->se_cmd : NULL;
748 int rc;
749
750 WARN_ON(!list_empty(&cmd->i_conn_node));
751
752 __iscsit_free_cmd(cmd, shutdown);
753 if (se_cmd) {
754 rc = transport_generic_free_cmd(se_cmd, shutdown);
755 if (!rc && shutdown && se_cmd->se_sess) {
756 __iscsit_free_cmd(cmd, shutdown);
757 target_put_sess_cmd(se_cmd);
758 }
759 } else {
760 iscsit_release_cmd(cmd);
761 }
762}
763EXPORT_SYMBOL(iscsit_free_cmd);
764
765bool iscsit_check_session_usage_count(struct iscsit_session *sess,
766 bool can_sleep)
767{
768 spin_lock_bh(&sess->session_usage_lock);
769 if (sess->session_usage_count != 0) {
770 sess->session_waiting_on_uc = 1;
771 spin_unlock_bh(&sess->session_usage_lock);
772 if (!can_sleep)
773 return true;
774
775 wait_for_completion(&sess->session_waiting_on_uc_comp);
776 return false;
777 }
778 spin_unlock_bh(&sess->session_usage_lock);
779
780 return false;
781}
782
783void iscsit_dec_session_usage_count(struct iscsit_session *sess)
784{
785 spin_lock_bh(&sess->session_usage_lock);
786 sess->session_usage_count--;
787
788 if (!sess->session_usage_count && sess->session_waiting_on_uc)
789 complete(&sess->session_waiting_on_uc_comp);
790
791 spin_unlock_bh(&sess->session_usage_lock);
792}
793
794void iscsit_inc_session_usage_count(struct iscsit_session *sess)
795{
796 spin_lock_bh(&sess->session_usage_lock);
797 sess->session_usage_count++;
798 spin_unlock_bh(&sess->session_usage_lock);
799}
800
801struct iscsit_conn *iscsit_get_conn_from_cid(struct iscsit_session *sess, u16 cid)
802{
803 struct iscsit_conn *conn;
804
805 spin_lock_bh(&sess->conn_lock);
806 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
807 if ((conn->cid == cid) &&
808 (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) {
809 iscsit_inc_conn_usage_count(conn);
810 spin_unlock_bh(&sess->conn_lock);
811 return conn;
812 }
813 }
814 spin_unlock_bh(&sess->conn_lock);
815
816 return NULL;
817}
818
819struct iscsit_conn *iscsit_get_conn_from_cid_rcfr(struct iscsit_session *sess, u16 cid)
820{
821 struct iscsit_conn *conn;
822
823 spin_lock_bh(&sess->conn_lock);
824 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
825 if (conn->cid == cid) {
826 iscsit_inc_conn_usage_count(conn);
827 spin_lock(&conn->state_lock);
828 atomic_set(&conn->connection_wait_rcfr, 1);
829 spin_unlock(&conn->state_lock);
830 spin_unlock_bh(&sess->conn_lock);
831 return conn;
832 }
833 }
834 spin_unlock_bh(&sess->conn_lock);
835
836 return NULL;
837}
838
839void iscsit_check_conn_usage_count(struct iscsit_conn *conn)
840{
841 spin_lock_bh(&conn->conn_usage_lock);
842 if (conn->conn_usage_count != 0) {
843 conn->conn_waiting_on_uc = 1;
844 spin_unlock_bh(&conn->conn_usage_lock);
845
846 wait_for_completion(&conn->conn_waiting_on_uc_comp);
847 return;
848 }
849 spin_unlock_bh(&conn->conn_usage_lock);
850}
851
852void iscsit_dec_conn_usage_count(struct iscsit_conn *conn)
853{
854 spin_lock_bh(&conn->conn_usage_lock);
855 conn->conn_usage_count--;
856
857 if (!conn->conn_usage_count && conn->conn_waiting_on_uc)
858 complete(&conn->conn_waiting_on_uc_comp);
859
860 spin_unlock_bh(&conn->conn_usage_lock);
861}
862
863void iscsit_inc_conn_usage_count(struct iscsit_conn *conn)
864{
865 spin_lock_bh(&conn->conn_usage_lock);
866 conn->conn_usage_count++;
867 spin_unlock_bh(&conn->conn_usage_lock);
868}
869
870static int iscsit_add_nopin(struct iscsit_conn *conn, int want_response)
871{
872 u8 state;
873 struct iscsit_cmd *cmd;
874
875 cmd = iscsit_allocate_cmd(conn, TASK_RUNNING);
876 if (!cmd)
877 return -1;
878
879 cmd->iscsi_opcode = ISCSI_OP_NOOP_IN;
880 state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE :
881 ISTATE_SEND_NOPIN_NO_RESPONSE;
882 cmd->init_task_tag = RESERVED_ITT;
883 cmd->targ_xfer_tag = (want_response) ?
884 session_get_next_ttt(conn->sess) : 0xFFFFFFFF;
885 spin_lock_bh(&conn->cmd_lock);
886 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
887 spin_unlock_bh(&conn->cmd_lock);
888
889 if (want_response)
890 iscsit_start_nopin_response_timer(conn);
891 iscsit_add_cmd_to_immediate_queue(cmd, conn, state);
892
893 return 0;
894}
895
896void iscsit_handle_nopin_response_timeout(struct timer_list *t)
897{
898 struct iscsit_conn *conn = from_timer(conn, t, nopin_response_timer);
899 struct iscsit_session *sess = conn->sess;
900
901 iscsit_inc_conn_usage_count(conn);
902
903 spin_lock_bh(&conn->nopin_timer_lock);
904 if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) {
905 spin_unlock_bh(&conn->nopin_timer_lock);
906 iscsit_dec_conn_usage_count(conn);
907 return;
908 }
909
910 pr_err("Did not receive response to NOPIN on CID: %hu, failing"
911 " connection for I_T Nexus %s,i,0x%6phN,%s,t,0x%02x\n",
912 conn->cid, sess->sess_ops->InitiatorName, sess->isid,
913 sess->tpg->tpg_tiqn->tiqn, (u32)sess->tpg->tpgt);
914 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
915 spin_unlock_bh(&conn->nopin_timer_lock);
916
917 iscsit_fill_cxn_timeout_err_stats(sess);
918 iscsit_cause_connection_reinstatement(conn, 0);
919 iscsit_dec_conn_usage_count(conn);
920}
921
922void iscsit_mod_nopin_response_timer(struct iscsit_conn *conn)
923{
924 struct iscsit_session *sess = conn->sess;
925 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
926
927 spin_lock_bh(&conn->nopin_timer_lock);
928 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
929 spin_unlock_bh(&conn->nopin_timer_lock);
930 return;
931 }
932
933 mod_timer(&conn->nopin_response_timer,
934 (get_jiffies_64() + na->nopin_response_timeout * HZ));
935 spin_unlock_bh(&conn->nopin_timer_lock);
936}
937
938void iscsit_start_nopin_response_timer(struct iscsit_conn *conn)
939{
940 struct iscsit_session *sess = conn->sess;
941 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
942
943 spin_lock_bh(&conn->nopin_timer_lock);
944 if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) {
945 spin_unlock_bh(&conn->nopin_timer_lock);
946 return;
947 }
948
949 conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP;
950 conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING;
951 mod_timer(&conn->nopin_response_timer,
952 jiffies + na->nopin_response_timeout * HZ);
953
954 pr_debug("Started NOPIN Response Timer on CID: %d to %u"
955 " seconds\n", conn->cid, na->nopin_response_timeout);
956 spin_unlock_bh(&conn->nopin_timer_lock);
957}
958
959void iscsit_stop_nopin_response_timer(struct iscsit_conn *conn)
960{
961 spin_lock_bh(&conn->nopin_timer_lock);
962 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
963 spin_unlock_bh(&conn->nopin_timer_lock);
964 return;
965 }
966 conn->nopin_response_timer_flags |= ISCSI_TF_STOP;
967 spin_unlock_bh(&conn->nopin_timer_lock);
968
969 del_timer_sync(&conn->nopin_response_timer);
970
971 spin_lock_bh(&conn->nopin_timer_lock);
972 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
973 spin_unlock_bh(&conn->nopin_timer_lock);
974}
975
976void iscsit_handle_nopin_timeout(struct timer_list *t)
977{
978 struct iscsit_conn *conn = from_timer(conn, t, nopin_timer);
979
980 iscsit_inc_conn_usage_count(conn);
981
982 spin_lock_bh(&conn->nopin_timer_lock);
983 if (conn->nopin_timer_flags & ISCSI_TF_STOP) {
984 spin_unlock_bh(&conn->nopin_timer_lock);
985 iscsit_dec_conn_usage_count(conn);
986 return;
987 }
988 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
989 spin_unlock_bh(&conn->nopin_timer_lock);
990
991 iscsit_add_nopin(conn, 1);
992 iscsit_dec_conn_usage_count(conn);
993}
994
995void __iscsit_start_nopin_timer(struct iscsit_conn *conn)
996{
997 struct iscsit_session *sess = conn->sess;
998 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
999
1000 lockdep_assert_held(&conn->nopin_timer_lock);
1001
1002 /*
1003 * NOPIN timeout is disabled.
1004 */
1005 if (!na->nopin_timeout)
1006 return;
1007
1008 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING)
1009 return;
1010
1011 conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1012 conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1013 mod_timer(&conn->nopin_timer, jiffies + na->nopin_timeout * HZ);
1014
1015 pr_debug("Started NOPIN Timer on CID: %d at %u second"
1016 " interval\n", conn->cid, na->nopin_timeout);
1017}
1018
1019void iscsit_start_nopin_timer(struct iscsit_conn *conn)
1020{
1021 spin_lock_bh(&conn->nopin_timer_lock);
1022 __iscsit_start_nopin_timer(conn);
1023 spin_unlock_bh(&conn->nopin_timer_lock);
1024}
1025
1026void iscsit_stop_nopin_timer(struct iscsit_conn *conn)
1027{
1028 spin_lock_bh(&conn->nopin_timer_lock);
1029 if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) {
1030 spin_unlock_bh(&conn->nopin_timer_lock);
1031 return;
1032 }
1033 conn->nopin_timer_flags |= ISCSI_TF_STOP;
1034 spin_unlock_bh(&conn->nopin_timer_lock);
1035
1036 del_timer_sync(&conn->nopin_timer);
1037
1038 spin_lock_bh(&conn->nopin_timer_lock);
1039 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1040 spin_unlock_bh(&conn->nopin_timer_lock);
1041}
1042
1043void iscsit_login_timeout(struct timer_list *t)
1044{
1045 struct iscsit_conn *conn = from_timer(conn, t, login_timer);
1046 struct iscsi_login *login = conn->login;
1047
1048 pr_debug("Entering iscsi_target_login_timeout >>>>>>>>>>>>>>>>>>>\n");
1049
1050 spin_lock_bh(&conn->login_timer_lock);
1051 login->login_failed = 1;
1052
1053 if (conn->login_kworker) {
1054 pr_debug("Sending SIGINT to conn->login_kworker %s/%d\n",
1055 conn->login_kworker->comm, conn->login_kworker->pid);
1056 send_sig(SIGINT, conn->login_kworker, 1);
1057 } else {
1058 schedule_delayed_work(&conn->login_work, 0);
1059 }
1060 spin_unlock_bh(&conn->login_timer_lock);
1061}
1062
1063void iscsit_start_login_timer(struct iscsit_conn *conn, struct task_struct *kthr)
1064{
1065 pr_debug("Login timer started\n");
1066
1067 conn->login_kworker = kthr;
1068 mod_timer(&conn->login_timer, jiffies + TA_LOGIN_TIMEOUT * HZ);
1069}
1070
1071int iscsit_set_login_timer_kworker(struct iscsit_conn *conn, struct task_struct *kthr)
1072{
1073 struct iscsi_login *login = conn->login;
1074 int ret = 0;
1075
1076 spin_lock_bh(&conn->login_timer_lock);
1077 if (login->login_failed) {
1078 /* The timer has already expired */
1079 ret = -1;
1080 } else {
1081 conn->login_kworker = kthr;
1082 }
1083 spin_unlock_bh(&conn->login_timer_lock);
1084
1085 return ret;
1086}
1087
1088void iscsit_stop_login_timer(struct iscsit_conn *conn)
1089{
1090 pr_debug("Login timer stopped\n");
1091 timer_delete_sync(&conn->login_timer);
1092}
1093
1094int iscsit_send_tx_data(
1095 struct iscsit_cmd *cmd,
1096 struct iscsit_conn *conn,
1097 int use_misc)
1098{
1099 int tx_sent, tx_size;
1100 u32 iov_count;
1101 struct kvec *iov;
1102
1103send_data:
1104 tx_size = cmd->tx_size;
1105
1106 if (!use_misc) {
1107 iov = &cmd->iov_data[0];
1108 iov_count = cmd->iov_data_count;
1109 } else {
1110 iov = &cmd->iov_misc[0];
1111 iov_count = cmd->iov_misc_count;
1112 }
1113
1114 tx_sent = tx_data(conn, &iov[0], iov_count, tx_size);
1115 if (tx_size != tx_sent) {
1116 if (tx_sent == -EAGAIN) {
1117 pr_err("tx_data() returned -EAGAIN\n");
1118 goto send_data;
1119 } else
1120 return -1;
1121 }
1122 cmd->tx_size = 0;
1123
1124 return 0;
1125}
1126
1127int iscsit_fe_sendpage_sg(
1128 struct iscsit_cmd *cmd,
1129 struct iscsit_conn *conn)
1130{
1131 struct scatterlist *sg = cmd->first_data_sg;
1132 struct bio_vec bvec;
1133 struct msghdr msghdr = { .msg_flags = MSG_SPLICE_PAGES, };
1134 struct kvec iov;
1135 u32 tx_hdr_size, data_len;
1136 u32 offset = cmd->first_data_sg_off;
1137 int tx_sent, iov_off;
1138
1139send_hdr:
1140 tx_hdr_size = ISCSI_HDR_LEN;
1141 if (conn->conn_ops->HeaderDigest)
1142 tx_hdr_size += ISCSI_CRC_LEN;
1143
1144 iov.iov_base = cmd->pdu;
1145 iov.iov_len = tx_hdr_size;
1146
1147 tx_sent = tx_data(conn, &iov, 1, tx_hdr_size);
1148 if (tx_hdr_size != tx_sent) {
1149 if (tx_sent == -EAGAIN) {
1150 pr_err("tx_data() returned -EAGAIN\n");
1151 goto send_hdr;
1152 }
1153 return -1;
1154 }
1155
1156 data_len = cmd->tx_size - tx_hdr_size - cmd->padding;
1157 /*
1158 * Set iov_off used by padding and data digest tx_data() calls below
1159 * in order to determine proper offset into cmd->iov_data[]
1160 */
1161 if (conn->conn_ops->DataDigest) {
1162 data_len -= ISCSI_CRC_LEN;
1163 if (cmd->padding)
1164 iov_off = (cmd->iov_data_count - 2);
1165 else
1166 iov_off = (cmd->iov_data_count - 1);
1167 } else {
1168 iov_off = (cmd->iov_data_count - 1);
1169 }
1170 /*
1171 * Perform sendpage() for each page in the scatterlist
1172 */
1173 while (data_len) {
1174 u32 space = (sg->length - offset);
1175 u32 sub_len = min_t(u32, data_len, space);
1176send_pg:
1177 bvec_set_page(&bvec, sg_page(sg), sub_len, sg->offset + offset);
1178 iov_iter_bvec(&msghdr.msg_iter, ITER_SOURCE, &bvec, 1, sub_len);
1179
1180 tx_sent = conn->sock->ops->sendmsg(conn->sock, &msghdr,
1181 sub_len);
1182 if (tx_sent != sub_len) {
1183 if (tx_sent == -EAGAIN) {
1184 pr_err("sendmsg/splice returned -EAGAIN\n");
1185 goto send_pg;
1186 }
1187
1188 pr_err("sendmsg/splice failure: %d\n", tx_sent);
1189 return -1;
1190 }
1191
1192 data_len -= sub_len;
1193 offset = 0;
1194 sg = sg_next(sg);
1195 }
1196
1197send_padding:
1198 if (cmd->padding) {
1199 struct kvec *iov_p = &cmd->iov_data[iov_off++];
1200
1201 tx_sent = tx_data(conn, iov_p, 1, cmd->padding);
1202 if (cmd->padding != tx_sent) {
1203 if (tx_sent == -EAGAIN) {
1204 pr_err("tx_data() returned -EAGAIN\n");
1205 goto send_padding;
1206 }
1207 return -1;
1208 }
1209 }
1210
1211send_datacrc:
1212 if (conn->conn_ops->DataDigest) {
1213 struct kvec *iov_d = &cmd->iov_data[iov_off];
1214
1215 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN);
1216 if (ISCSI_CRC_LEN != tx_sent) {
1217 if (tx_sent == -EAGAIN) {
1218 pr_err("tx_data() returned -EAGAIN\n");
1219 goto send_datacrc;
1220 }
1221 return -1;
1222 }
1223 }
1224
1225 return 0;
1226}
1227
1228/*
1229 * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU
1230 * back to the Initiator when an expection condition occurs with the
1231 * errors set in status_class and status_detail.
1232 *
1233 * Parameters: iSCSI Connection, Status Class, Status Detail.
1234 * Returns: 0 on success, -1 on error.
1235 */
1236int iscsit_tx_login_rsp(struct iscsit_conn *conn, u8 status_class, u8 status_detail)
1237{
1238 struct iscsi_login_rsp *hdr;
1239 struct iscsi_login *login = conn->conn_login;
1240
1241 login->login_failed = 1;
1242 iscsit_collect_login_stats(conn, status_class, status_detail);
1243
1244 memset(&login->rsp[0], 0, ISCSI_HDR_LEN);
1245
1246 hdr = (struct iscsi_login_rsp *)&login->rsp[0];
1247 hdr->opcode = ISCSI_OP_LOGIN_RSP;
1248 hdr->status_class = status_class;
1249 hdr->status_detail = status_detail;
1250 hdr->itt = conn->login_itt;
1251
1252 return conn->conn_transport->iscsit_put_login_tx(conn, login, 0);
1253}
1254
1255void iscsit_print_session_params(struct iscsit_session *sess)
1256{
1257 struct iscsit_conn *conn;
1258
1259 pr_debug("-----------------------------[Session Params for"
1260 " SID: %u]-----------------------------\n", sess->sid);
1261 spin_lock_bh(&sess->conn_lock);
1262 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
1263 iscsi_dump_conn_ops(conn->conn_ops);
1264 spin_unlock_bh(&sess->conn_lock);
1265
1266 iscsi_dump_sess_ops(sess->sess_ops);
1267}
1268
1269int rx_data(
1270 struct iscsit_conn *conn,
1271 struct kvec *iov,
1272 int iov_count,
1273 int data)
1274{
1275 int rx_loop = 0, total_rx = 0;
1276 struct msghdr msg;
1277
1278 if (!conn || !conn->sock || !conn->conn_ops)
1279 return -1;
1280
1281 memset(&msg, 0, sizeof(struct msghdr));
1282 iov_iter_kvec(&msg.msg_iter, ITER_DEST, iov, iov_count, data);
1283
1284 while (msg_data_left(&msg)) {
1285 rx_loop = sock_recvmsg(conn->sock, &msg, MSG_WAITALL);
1286 if (rx_loop <= 0) {
1287 pr_debug("rx_loop: %d total_rx: %d\n",
1288 rx_loop, total_rx);
1289 return rx_loop;
1290 }
1291 total_rx += rx_loop;
1292 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n",
1293 rx_loop, total_rx, data);
1294 }
1295
1296 return total_rx;
1297}
1298
1299int tx_data(
1300 struct iscsit_conn *conn,
1301 struct kvec *iov,
1302 int iov_count,
1303 int data)
1304{
1305 struct msghdr msg;
1306 int total_tx = 0;
1307
1308 if (!conn || !conn->sock || !conn->conn_ops)
1309 return -1;
1310
1311 if (data <= 0) {
1312 pr_err("Data length is: %d\n", data);
1313 return -1;
1314 }
1315
1316 memset(&msg, 0, sizeof(struct msghdr));
1317
1318 iov_iter_kvec(&msg.msg_iter, ITER_SOURCE, iov, iov_count, data);
1319
1320 while (msg_data_left(&msg)) {
1321 int tx_loop = sock_sendmsg(conn->sock, &msg);
1322 if (tx_loop <= 0) {
1323 pr_debug("tx_loop: %d total_tx %d\n",
1324 tx_loop, total_tx);
1325 return tx_loop;
1326 }
1327 total_tx += tx_loop;
1328 pr_debug("tx_loop: %d, total_tx: %d, data: %d\n",
1329 tx_loop, total_tx, data);
1330 }
1331
1332 return total_tx;
1333}
1334
1335void iscsit_collect_login_stats(
1336 struct iscsit_conn *conn,
1337 u8 status_class,
1338 u8 status_detail)
1339{
1340 struct iscsi_param *intrname = NULL;
1341 struct iscsi_tiqn *tiqn;
1342 struct iscsi_login_stats *ls;
1343
1344 tiqn = iscsit_snmp_get_tiqn(conn);
1345 if (!tiqn)
1346 return;
1347
1348 ls = &tiqn->login_stats;
1349
1350 spin_lock(&ls->lock);
1351 if (status_class == ISCSI_STATUS_CLS_SUCCESS)
1352 ls->accepts++;
1353 else if (status_class == ISCSI_STATUS_CLS_REDIRECT) {
1354 ls->redirects++;
1355 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT;
1356 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1357 (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) {
1358 ls->authenticate_fails++;
1359 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE;
1360 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1361 (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) {
1362 ls->authorize_fails++;
1363 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE;
1364 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1365 (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) {
1366 ls->negotiate_fails++;
1367 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE;
1368 } else {
1369 ls->other_fails++;
1370 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER;
1371 }
1372
1373 /* Save initiator name, ip address and time, if it is a failed login */
1374 if (status_class != ISCSI_STATUS_CLS_SUCCESS) {
1375 if (conn->param_list)
1376 intrname = iscsi_find_param_from_key(INITIATORNAME,
1377 conn->param_list);
1378 strscpy(ls->last_intr_fail_name,
1379 (intrname ? intrname->value : "Unknown"),
1380 sizeof(ls->last_intr_fail_name));
1381
1382 ls->last_intr_fail_ip_family = conn->login_family;
1383
1384 ls->last_intr_fail_sockaddr = conn->login_sockaddr;
1385 ls->last_fail_time = get_jiffies_64();
1386 }
1387
1388 spin_unlock(&ls->lock);
1389}
1390
1391struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsit_conn *conn)
1392{
1393 struct iscsi_portal_group *tpg;
1394
1395 if (!conn)
1396 return NULL;
1397
1398 tpg = conn->tpg;
1399 if (!tpg)
1400 return NULL;
1401
1402 if (!tpg->tpg_tiqn)
1403 return NULL;
1404
1405 return tpg->tpg_tiqn;
1406}
1407
1408void iscsit_fill_cxn_timeout_err_stats(struct iscsit_session *sess)
1409{
1410 struct iscsi_portal_group *tpg = sess->tpg;
1411 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
1412
1413 if (!tiqn)
1414 return;
1415
1416 spin_lock_bh(&tiqn->sess_err_stats.lock);
1417 strscpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
1418 sess->sess_ops->InitiatorName,
1419 sizeof(tiqn->sess_err_stats.last_sess_fail_rem_name));
1420 tiqn->sess_err_stats.last_sess_failure_type =
1421 ISCSI_SESS_ERR_CXN_TIMEOUT;
1422 tiqn->sess_err_stats.cxn_timeout_errors++;
1423 atomic_long_inc(&sess->conn_timeout_errors);
1424 spin_unlock_bh(&tiqn->sess_err_stats.lock);
1425}