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1// SPDX-License-Identifier: GPL-2.0-or-later2/*******************************************************************************3 * This file contains the iSCSI Virtual Device and Disk Transport4 * 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 already26 * assigned in iscsi_login_zero_tsih(). Since only Logout and27 * Text Opcodes are allowed during discovery we do not have to worry28 * 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 the37 * struct se_node_acl->queue_depth. The value in struct se_node_acl->queue_depth38 * has already been validated as a legal value in39 * 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