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_device.h> 25 #include <target/target_core_transport.h> 26 27 #include "iscsi_target_core.h" 28 #include "iscsi_target_device.h" 29 #include "iscsi_target_tpg.h" 30 #include "iscsi_target_util.h" 31 32 int iscsit_get_lun_for_tmr( 33 struct iscsi_cmd *cmd, 34 u64 lun) 35 { 36 u32 unpacked_lun = scsilun_to_int((struct scsi_lun *)&lun); 37 38 return transport_lookup_tmr_lun(&cmd->se_cmd, unpacked_lun); 39 } 40 41 int iscsit_get_lun_for_cmd( 42 struct iscsi_cmd *cmd, 43 unsigned char *cdb, 44 u64 lun) 45 { 46 u32 unpacked_lun = scsilun_to_int((struct scsi_lun *)&lun); 47 48 return transport_lookup_cmd_lun(&cmd->se_cmd, unpacked_lun); 49 } 50 51 void iscsit_determine_maxcmdsn(struct iscsi_session *sess) 52 { 53 struct se_node_acl *se_nacl; 54 55 /* 56 * This is a discovery session, the single queue slot was already 57 * assigned in iscsi_login_zero_tsih(). Since only Logout and 58 * Text Opcodes are allowed during discovery we do not have to worry 59 * about the HBA's queue depth here. 60 */ 61 if (sess->sess_ops->SessionType) 62 return; 63 64 se_nacl = sess->se_sess->se_node_acl; 65 66 /* 67 * This is a normal session, set the Session's CmdSN window to the 68 * struct se_node_acl->queue_depth. The value in struct se_node_acl->queue_depth 69 * has already been validated as a legal value in 70 * core_set_queue_depth_for_node(). 71 */ 72 sess->cmdsn_window = se_nacl->queue_depth; 73 sess->max_cmd_sn = (sess->max_cmd_sn + se_nacl->queue_depth) - 1; 74 } 75 76 void iscsit_increment_maxcmdsn(struct iscsi_cmd *cmd, struct iscsi_session *sess) 77 { 78 if (cmd->immediate_cmd || cmd->maxcmdsn_inc) 79 return; 80 81 cmd->maxcmdsn_inc = 1; 82 83 mutex_lock(&sess->cmdsn_mutex); 84 sess->max_cmd_sn += 1; 85 pr_debug("Updated MaxCmdSN to 0x%08x\n", sess->max_cmd_sn); 86 mutex_unlock(&sess->cmdsn_mutex); 87 } 88