1 /******************************************************************************* 2 * This file contains the iSCSI Virtual Device and Disk Transport 3 * agnostic related functions. 4 * 5 * (c) Copyright 2007-2013 Datera, Inc. 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 <target/target_core_base.h> 21 #include <target/target_core_fabric.h> 22 23 #include <target/iscsi/iscsi_target_core.h> 24 #include "iscsi_target_device.h" 25 #include "iscsi_target_tpg.h" 26 #include "iscsi_target_util.h" 27 28 void iscsit_determine_maxcmdsn(struct iscsi_session *sess) 29 { 30 struct se_node_acl *se_nacl; 31 32 /* 33 * This is a discovery session, the single queue slot was already 34 * assigned in iscsi_login_zero_tsih(). Since only Logout and 35 * Text Opcodes are allowed during discovery we do not have to worry 36 * about the HBA's queue depth here. 37 */ 38 if (sess->sess_ops->SessionType) 39 return; 40 41 se_nacl = sess->se_sess->se_node_acl; 42 43 /* 44 * This is a normal session, set the Session's CmdSN window to the 45 * struct se_node_acl->queue_depth. The value in struct se_node_acl->queue_depth 46 * has already been validated as a legal value in 47 * core_set_queue_depth_for_node(). 48 */ 49 sess->cmdsn_window = se_nacl->queue_depth; 50 atomic_add(se_nacl->queue_depth - 1, &sess->max_cmd_sn); 51 } 52 53 void iscsit_increment_maxcmdsn(struct iscsi_cmd *cmd, struct iscsi_session *sess) 54 { 55 u32 max_cmd_sn; 56 57 if (cmd->immediate_cmd || cmd->maxcmdsn_inc) 58 return; 59 60 cmd->maxcmdsn_inc = 1; 61 62 max_cmd_sn = atomic_inc_return(&sess->max_cmd_sn); 63 pr_debug("Updated MaxCmdSN to 0x%08x\n", max_cmd_sn); 64 } 65 EXPORT_SYMBOL(iscsit_increment_maxcmdsn); 66