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e48354ce NB |
1 | /******************************************************************************* |
2 | * This file contains the iSCSI Virtual Device and Disk Transport | |
3 | * agnostic related functions. | |
4 | * | |
4c76251e | 5 | * (c) Copyright 2007-2013 Datera, Inc. |
e48354ce NB |
6 | * |
7 | * Author: Nicholas A. Bellinger <nab@linux-iscsi.org> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | ******************************************************************************/ | |
19 | ||
20 | #include <scsi/scsi_device.h> | |
21 | #include <target/target_core_base.h> | |
c4795fb2 | 22 | #include <target/target_core_fabric.h> |
e48354ce NB |
23 | |
24 | #include "iscsi_target_core.h" | |
25 | #include "iscsi_target_device.h" | |
26 | #include "iscsi_target_tpg.h" | |
27 | #include "iscsi_target_util.h" | |
28 | ||
e48354ce NB |
29 | void iscsit_determine_maxcmdsn(struct iscsi_session *sess) |
30 | { | |
31 | struct se_node_acl *se_nacl; | |
32 | ||
33 | /* | |
34 | * This is a discovery session, the single queue slot was already | |
35 | * assigned in iscsi_login_zero_tsih(). Since only Logout and | |
36 | * Text Opcodes are allowed during discovery we do not have to worry | |
37 | * about the HBA's queue depth here. | |
38 | */ | |
39 | if (sess->sess_ops->SessionType) | |
40 | return; | |
41 | ||
42 | se_nacl = sess->se_sess->se_node_acl; | |
43 | ||
44 | /* | |
45 | * This is a normal session, set the Session's CmdSN window to the | |
46 | * struct se_node_acl->queue_depth. The value in struct se_node_acl->queue_depth | |
47 | * has already been validated as a legal value in | |
48 | * core_set_queue_depth_for_node(). | |
49 | */ | |
50 | sess->cmdsn_window = se_nacl->queue_depth; | |
51 | sess->max_cmd_sn = (sess->max_cmd_sn + se_nacl->queue_depth) - 1; | |
52 | } | |
53 | ||
54 | void iscsit_increment_maxcmdsn(struct iscsi_cmd *cmd, struct iscsi_session *sess) | |
55 | { | |
56 | if (cmd->immediate_cmd || cmd->maxcmdsn_inc) | |
57 | return; | |
58 | ||
59 | cmd->maxcmdsn_inc = 1; | |
60 | ||
5e8e6b4b | 61 | mutex_lock(&sess->cmdsn_mutex); |
e48354ce NB |
62 | sess->max_cmd_sn += 1; |
63 | pr_debug("Updated MaxCmdSN to 0x%08x\n", sess->max_cmd_sn); | |
64 | mutex_unlock(&sess->cmdsn_mutex); | |
65 | } | |
2ec5a8c1 | 66 | EXPORT_SYMBOL(iscsit_increment_maxcmdsn); |