1 /*******************************************************************************
2 * This file contains the iSCSI Virtual Device and Disk Transport
3 * agnostic related functions.
4 *
5 \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
6 *
7 * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
8 *
9 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 ******************************************************************************/
21
22 #include <scsi/scsi_device.h>
23 #include <target/target_core_base.h>
24 #include <target/target_core_fabric.h>
25
26 #include "iscsi_target_core.h"
27 #include "iscsi_target_device.h"
28 #include "iscsi_target_tpg.h"
29 #include "iscsi_target_util.h"
30
iscsit_get_lun_for_tmr(struct iscsi_cmd * cmd,u64 lun)31 int iscsit_get_lun_for_tmr(
32 struct iscsi_cmd *cmd,
33 u64 lun)
34 {
35 u32 unpacked_lun = scsilun_to_int((struct scsi_lun *)&lun);
36
37 return transport_lookup_tmr_lun(&cmd->se_cmd, unpacked_lun);
38 }
39
iscsit_get_lun_for_cmd(struct iscsi_cmd * cmd,unsigned char * cdb,u64 lun)40 int iscsit_get_lun_for_cmd(
41 struct iscsi_cmd *cmd,
42 unsigned char *cdb,
43 u64 lun)
44 {
45 u32 unpacked_lun = scsilun_to_int((struct scsi_lun *)&lun);
46
47 return transport_lookup_cmd_lun(&cmd->se_cmd, unpacked_lun);
48 }
49
iscsit_determine_maxcmdsn(struct iscsi_session * sess)50 void iscsit_determine_maxcmdsn(struct iscsi_session *sess)
51 {
52 struct se_node_acl *se_nacl;
53
54 /*
55 * This is a discovery session, the single queue slot was already
56 * assigned in iscsi_login_zero_tsih(). Since only Logout and
57 * Text Opcodes are allowed during discovery we do not have to worry
58 * about the HBA's queue depth here.
59 */
60 if (sess->sess_ops->SessionType)
61 return;
62
63 se_nacl = sess->se_sess->se_node_acl;
64
65 /*
66 * This is a normal session, set the Session's CmdSN window to the
67 * struct se_node_acl->queue_depth. The value in struct se_node_acl->queue_depth
68 * has already been validated as a legal value in
69 * core_set_queue_depth_for_node().
70 */
71 sess->cmdsn_window = se_nacl->queue_depth;
72 sess->max_cmd_sn = (sess->max_cmd_sn + se_nacl->queue_depth) - 1;
73 }
74
iscsit_increment_maxcmdsn(struct iscsi_cmd * cmd,struct iscsi_session * sess)75 void iscsit_increment_maxcmdsn(struct iscsi_cmd *cmd, struct iscsi_session *sess)
76 {
77 if (cmd->immediate_cmd || cmd->maxcmdsn_inc)
78 return;
79
80 cmd->maxcmdsn_inc = 1;
81
82 mutex_lock(&sess->cmdsn_mutex);
83 sess->max_cmd_sn += 1;
84 pr_debug("Updated MaxCmdSN to 0x%08x\n", sess->max_cmd_sn);
85 mutex_unlock(&sess->cmdsn_mutex);
86 }
87