e48354ce07
The Linux-iSCSI.org target module is a full featured in-kernel software implementation of iSCSI target mode (RFC-3720) for the current WIP mainline target v4.1 infrastructure code for the v3.1 kernel. More information can be found here: http://linux-iscsi.org/wiki/ISCSI This includes support for: * RFC-3720 defined request / response state machines and support for all defined iSCSI operation codes from Section 10.2.1.2 using libiscsi include/scsi/iscsi_proto.h PDU definitions * Target v4.1 compatible control plane using the generic layout in target_core_fabric_configfs.c and fabric dependent attributes within /sys/kernel/config/target/iscsi/ subdirectories. * Target v4.1 compatible iSCSI statistics based on RFC-4544 (iSCSI MIBS) * Support for IPv6 and IPv4 network portals in M:N mapping to TPGs * iSCSI Error Recovery Hierarchy support * Per iSCSI connection RX/TX thread pair scheduling affinity * crc32c + crc32c_intel SSEv4 instruction offload support using libcrypto * CHAP Authentication support using libcrypto * Conversion to use internal SGl allocation with iscsit_alloc_buffs() -> transport_generic_map_mem_to_cmd() (nab: Fix iscsi_proto.h struct scsi_lun usage from linux-next in commit: iscsi: Use struct scsi_lun in iscsi structs instead of u8[8]) (nab: Fix 32-bit compile warnings) Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Andy Grover <agrover@redhat.com> Acked-by: Roland Dreier <roland@kernel.org> Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org>
87 lines
2.7 KiB
C
87 lines
2.7 KiB
C
/*******************************************************************************
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* This file contains the iSCSI Virtual Device and Disk Transport
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* agnostic related functions.
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*
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\u00a9 Copyright 2007-2011 RisingTide Systems LLC.
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*
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* Licensed to the Linux Foundation under the General Public License (GPL) version 2.
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*
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* Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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******************************************************************************/
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#include <scsi/scsi_device.h>
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#include <target/target_core_base.h>
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#include <target/target_core_device.h>
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#include <target/target_core_transport.h>
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#include "iscsi_target_core.h"
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#include "iscsi_target_device.h"
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#include "iscsi_target_tpg.h"
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#include "iscsi_target_util.h"
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int iscsit_get_lun_for_tmr(
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struct iscsi_cmd *cmd,
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u64 lun)
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{
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u32 unpacked_lun = scsilun_to_int((struct scsi_lun *)&lun);
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return transport_lookup_tmr_lun(&cmd->se_cmd, unpacked_lun);
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}
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int iscsit_get_lun_for_cmd(
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struct iscsi_cmd *cmd,
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unsigned char *cdb,
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u64 lun)
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{
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u32 unpacked_lun = scsilun_to_int((struct scsi_lun *)&lun);
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return transport_lookup_cmd_lun(&cmd->se_cmd, unpacked_lun);
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}
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void iscsit_determine_maxcmdsn(struct iscsi_session *sess)
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{
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struct se_node_acl *se_nacl;
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/*
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* This is a discovery session, the single queue slot was already
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* assigned in iscsi_login_zero_tsih(). Since only Logout and
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* Text Opcodes are allowed during discovery we do not have to worry
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* about the HBA's queue depth here.
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*/
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if (sess->sess_ops->SessionType)
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return;
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se_nacl = sess->se_sess->se_node_acl;
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/*
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* This is a normal session, set the Session's CmdSN window to the
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* struct se_node_acl->queue_depth. The value in struct se_node_acl->queue_depth
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* has already been validated as a legal value in
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* core_set_queue_depth_for_node().
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*/
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sess->cmdsn_window = se_nacl->queue_depth;
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sess->max_cmd_sn = (sess->max_cmd_sn + se_nacl->queue_depth) - 1;
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}
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void iscsit_increment_maxcmdsn(struct iscsi_cmd *cmd, struct iscsi_session *sess)
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{
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if (cmd->immediate_cmd || cmd->maxcmdsn_inc)
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return;
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cmd->maxcmdsn_inc = 1;
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mutex_lock(&sess->cmdsn_mutex);
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sess->max_cmd_sn += 1;
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pr_debug("Updated MaxCmdSN to 0x%08x\n", sess->max_cmd_sn);
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mutex_unlock(&sess->cmdsn_mutex);
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}
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