1// SPDX-License-Identifier: GPL-2.0-or-later
2/*******************************************************************************
3 * This file contains the iSCSI Virtual Device and Disk Transport
4 * agnostic related functions.
5 *
6 * (c) Copyright 2007-2013 Datera, Inc.
7 *
8 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
9 *
10 ******************************************************************************/
11
12#include <target/target_core_base.h>
13#include <target/target_core_fabric.h>
14
15#include <target/iscsi/iscsi_target_core.h>
16#include "iscsi_target_device.h"
17#include "iscsi_target_tpg.h"
18#include "iscsi_target_util.h"
19
20void iscsit_determine_maxcmdsn(struct iscsit_session *sess)
21{
22	struct se_node_acl *se_nacl;
23
24	/*
25	 * This is a discovery session, the single queue slot was already
26	 * assigned in iscsi_login_zero_tsih().  Since only Logout and
27	 * Text Opcodes are allowed during discovery we do not have to worry
28	 * about the HBA's queue depth here.
29	 */
30	if (sess->sess_ops->SessionType)
31		return;
32
33	se_nacl = sess->se_sess->se_node_acl;
34
35	/*
36	 * This is a normal session, set the Session's CmdSN window to the
37	 * struct se_node_acl->queue_depth.  The value in struct se_node_acl->queue_depth
38	 * has already been validated as a legal value in
39	 * core_set_queue_depth_for_node().
40	 */
41	sess->cmdsn_window = se_nacl->queue_depth;
42	atomic_add(se_nacl->queue_depth - 1, &sess->max_cmd_sn);
43}
44
45void iscsit_increment_maxcmdsn(struct iscsit_cmd *cmd, struct iscsit_session *sess)
46{
47	u32 max_cmd_sn;
48
49	if (cmd->immediate_cmd || cmd->maxcmdsn_inc)
50		return;
51
52	cmd->maxcmdsn_inc = 1;
53
54	max_cmd_sn = atomic_inc_return(&sess->max_cmd_sn);
55	pr_debug("Updated MaxCmdSN to 0x%08x\n", max_cmd_sn);
56}
57EXPORT_SYMBOL(iscsit_increment_maxcmdsn);
58