projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| e48354ce NB |
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> | |
| c4795fb2 | 24 | #include <target/target_core_fabric.h> |
| e48354ce NB |
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 | ||
| e48354ce NB |
31 | void iscsit_determine_maxcmdsn(struct iscsi_session *sess) |
| 32 | { | |
| 33 | struct se_node_acl *se_nacl; | |
| 34 | ||
| 35 | /* | |
| 36 | * This is a discovery session, the single queue slot was already | |
| 37 | * assigned in iscsi_login_zero_tsih(). Since only Logout and | |
| 38 | * Text Opcodes are allowed during discovery we do not have to worry | |
| 39 | * about the HBA's queue depth here. | |
| 40 | */ | |
| 41 | if (sess->sess_ops->SessionType) | |
| 42 | return; | |
| 43 | ||
| 44 | se_nacl = sess->se_sess->se_node_acl; | |
| 45 | ||
| 46 | /* | |
| 47 | * This is a normal session, set the Session's CmdSN window to the | |
| 48 | * struct se_node_acl->queue_depth. The value in struct se_node_acl->queue_depth | |
| 49 | * has already been validated as a legal value in | |
| 50 | * core_set_queue_depth_for_node(). | |
| 51 | */ | |
| 52 | sess->cmdsn_window = se_nacl->queue_depth; | |
| 53 | sess->max_cmd_sn = (sess->max_cmd_sn + se_nacl->queue_depth) - 1; | |
| 54 | } | |
| 55 | ||
| 56 | void iscsit_increment_maxcmdsn(struct iscsi_cmd *cmd, struct iscsi_session *sess) | |
| 57 | { | |
| 58 | if (cmd->immediate_cmd || cmd->maxcmdsn_inc) | |
| 59 | return; | |
| 60 | ||
| 61 | cmd->maxcmdsn_inc = 1; | |
| 62 | ||
| 63 | mutex_lock(&sess->cmdsn_mutex); | |
| 64 | sess->max_cmd_sn += 1; | |
| 65 | pr_debug("Updated MaxCmdSN to 0x%08x\n", sess->max_cmd_sn); | |
| 66 | mutex_unlock(&sess->cmdsn_mutex); | |
| 67 | } |