Commit e48354ce authored by Nicholas Bellinger's avatar Nicholas Bellinger

iscsi-target: Add iSCSI fabric support for target v4.1

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: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarAndy Grover <agrover@redhat.com>
Acked-by: default avatarRoland Dreier <roland@kernel.org>
Signed-off-by: default avatarNicholas A. Bellinger <nab@linux-iscsi.org>
parent 8304bbce
......@@ -31,5 +31,6 @@ config TCM_PSCSI
source "drivers/target/loopback/Kconfig"
source "drivers/target/tcm_fc/Kconfig"
source "drivers/target/iscsi/Kconfig"
endif
......@@ -24,5 +24,5 @@ obj-$(CONFIG_TCM_PSCSI) += target_core_pscsi.o
# Fabric modules
obj-$(CONFIG_LOOPBACK_TARGET) += loopback/
obj-$(CONFIG_TCM_FC) += tcm_fc/
obj-$(CONFIG_ISCSI_TARGET) += iscsi/
config ISCSI_TARGET
tristate "Linux-iSCSI.org iSCSI Target Mode Stack"
select CRYPTO
select CRYPTO_CRC32C
select CRYPTO_CRC32C_INTEL if X86
help
Say M here to enable the ConfigFS enabled Linux-iSCSI.org iSCSI
Target Mode Stack.
iscsi_target_mod-y += iscsi_target_parameters.o \
iscsi_target_seq_pdu_list.o \
iscsi_target_tq.o \
iscsi_target_auth.o \
iscsi_target_datain_values.o \
iscsi_target_device.o \
iscsi_target_erl0.o \
iscsi_target_erl1.o \
iscsi_target_erl2.o \
iscsi_target_login.o \
iscsi_target_nego.o \
iscsi_target_nodeattrib.o \
iscsi_target_tmr.o \
iscsi_target_tpg.o \
iscsi_target_util.o \
iscsi_target.o \
iscsi_target_configfs.o \
iscsi_target_stat.o
obj-$(CONFIG_ISCSI_TARGET) += iscsi_target_mod.o
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#ifndef ISCSI_TARGET_H
#define ISCSI_TARGET_H
extern struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *);
extern struct iscsi_tiqn *iscsit_get_tiqn(unsigned char *, int);
extern void iscsit_put_tiqn_for_login(struct iscsi_tiqn *);
extern struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *);
extern void iscsit_del_tiqn(struct iscsi_tiqn *);
extern int iscsit_access_np(struct iscsi_np *, struct iscsi_portal_group *);
extern int iscsit_deaccess_np(struct iscsi_np *, struct iscsi_portal_group *);
extern struct iscsi_np *iscsit_add_np(struct __kernel_sockaddr_storage *,
char *, int);
extern int iscsit_reset_np_thread(struct iscsi_np *, struct iscsi_tpg_np *,
struct iscsi_portal_group *);
extern int iscsit_del_np(struct iscsi_np *);
extern int iscsit_add_reject_from_cmd(u8, int, int, unsigned char *, struct iscsi_cmd *);
extern int iscsit_logout_closesession(struct iscsi_cmd *, struct iscsi_conn *);
extern int iscsit_logout_closeconnection(struct iscsi_cmd *, struct iscsi_conn *);
extern int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *, struct iscsi_conn *);
extern int iscsit_send_async_msg(struct iscsi_conn *, u16, u8, u8);
extern int iscsit_send_r2t(struct iscsi_cmd *, struct iscsi_conn *);
extern int iscsit_build_r2ts_for_cmd(struct iscsi_cmd *, struct iscsi_conn *, int);
extern void iscsit_thread_get_cpumask(struct iscsi_conn *);
extern int iscsi_target_tx_thread(void *);
extern int iscsi_target_rx_thread(void *);
extern int iscsit_close_connection(struct iscsi_conn *);
extern int iscsit_close_session(struct iscsi_session *);
extern void iscsit_fail_session(struct iscsi_session *);
extern int iscsit_free_session(struct iscsi_session *);
extern void iscsit_stop_session(struct iscsi_session *, int, int);
extern int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *, int);
extern struct iscsit_global *iscsit_global;
extern struct target_fabric_configfs *lio_target_fabric_configfs;
extern struct kmem_cache *lio_dr_cache;
extern struct kmem_cache *lio_ooo_cache;
extern struct kmem_cache *lio_cmd_cache;
extern struct kmem_cache *lio_qr_cache;
extern struct kmem_cache *lio_r2t_cache;
#endif /*** ISCSI_TARGET_H ***/
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#ifndef _ISCSI_CHAP_H_
#define _ISCSI_CHAP_H_
#define CHAP_DIGEST_MD5 5
#define CHAP_DIGEST_SHA 6
#define CHAP_CHALLENGE_LENGTH 16
#define CHAP_CHALLENGE_STR_LEN 4096
#define MAX_RESPONSE_LENGTH 64 /* sufficient for MD5 */
#define MAX_CHAP_N_SIZE 512
#define MD5_SIGNATURE_SIZE 16 /* 16 bytes in a MD5 message digest */
#define CHAP_STAGE_CLIENT_A 1
#define CHAP_STAGE_SERVER_AIC 2
#define CHAP_STAGE_CLIENT_NR 3
#define CHAP_STAGE_CLIENT_NRIC 4
#define CHAP_STAGE_SERVER_NR 5
extern u32 chap_main_loop(struct iscsi_conn *, struct iscsi_node_auth *, char *, char *,
int *, int *);
struct iscsi_chap {
unsigned char digest_type;
unsigned char id;
unsigned char challenge[CHAP_CHALLENGE_LENGTH];
unsigned int authenticate_target;
unsigned int chap_state;
} ____cacheline_aligned;
#endif /*** _ISCSI_CHAP_H_ ***/
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#ifndef ISCSI_TARGET_CONFIGFS_H
#define ISCSI_TARGET_CONFIGFS_H
extern int iscsi_target_register_configfs(void);
extern void iscsi_target_deregister_configfs(void);
#endif /* ISCSI_TARGET_CONFIGFS_H */
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#ifndef ISCSI_TARGET_DATAIN_VALUES_H
#define ISCSI_TARGET_DATAIN_VALUES_H
extern struct iscsi_datain_req *iscsit_allocate_datain_req(void);
extern void iscsit_attach_datain_req(struct iscsi_cmd *, struct iscsi_datain_req *);
extern void iscsit_free_datain_req(struct iscsi_cmd *, struct iscsi_datain_req *);
extern void iscsit_free_all_datain_reqs(struct iscsi_cmd *);
extern struct iscsi_datain_req *iscsit_get_datain_req(struct iscsi_cmd *);
extern struct iscsi_datain_req *iscsit_get_datain_values(struct iscsi_cmd *,
struct iscsi_datain *);
#endif /*** ISCSI_TARGET_DATAIN_VALUES_H ***/
/*******************************************************************************
* This file contains the iSCSI Virtual Device and Disk Transport
* agnostic related functions.
*
\u00a9 Copyright 2007-2011 RisingTide Systems LLC.
*
* Licensed to the Linux Foundation under the General Public License (GPL) version 2.
*
* Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
******************************************************************************/
#include <scsi/scsi_device.h>
#include <target/target_core_base.h>
#include <target/target_core_device.h>
#include <target/target_core_transport.h>
#include "iscsi_target_core.h"
#include "iscsi_target_device.h"
#include "iscsi_target_tpg.h"
#include "iscsi_target_util.h"
int iscsit_get_lun_for_tmr(
struct iscsi_cmd *cmd,
u64 lun)
{
u32 unpacked_lun = scsilun_to_int((struct scsi_lun *)&lun);
return transport_lookup_tmr_lun(&cmd->se_cmd, unpacked_lun);
}
int iscsit_get_lun_for_cmd(
struct iscsi_cmd *cmd,
unsigned char *cdb,
u64 lun)
{
u32 unpacked_lun = scsilun_to_int((struct scsi_lun *)&lun);
return transport_lookup_cmd_lun(&cmd->se_cmd, unpacked_lun);
}
void iscsit_determine_maxcmdsn(struct iscsi_session *sess)
{
struct se_node_acl *se_nacl;
/*
* This is a discovery session, the single queue slot was already
* assigned in iscsi_login_zero_tsih(). Since only Logout and
* Text Opcodes are allowed during discovery we do not have to worry
* about the HBA's queue depth here.
*/
if (sess->sess_ops->SessionType)
return;
se_nacl = sess->se_sess->se_node_acl;
/*
* This is a normal session, set the Session's CmdSN window to the
* struct se_node_acl->queue_depth. The value in struct se_node_acl->queue_depth
* has already been validated as a legal value in
* core_set_queue_depth_for_node().
*/
sess->cmdsn_window = se_nacl->queue_depth;
sess->max_cmd_sn = (sess->max_cmd_sn + se_nacl->queue_depth) - 1;
}
void iscsit_increment_maxcmdsn(struct iscsi_cmd *cmd, struct iscsi_session *sess)
{
if (cmd->immediate_cmd || cmd->maxcmdsn_inc)
return;
cmd->maxcmdsn_inc = 1;
mutex_lock(&sess->cmdsn_mutex);
sess->max_cmd_sn += 1;
pr_debug("Updated MaxCmdSN to 0x%08x\n", sess->max_cmd_sn);
mutex_unlock(&sess->cmdsn_mutex);
}
#ifndef ISCSI_TARGET_DEVICE_H
#define ISCSI_TARGET_DEVICE_H
extern int iscsit_get_lun_for_tmr(struct iscsi_cmd *, u64);
extern int iscsit_get_lun_for_cmd(struct iscsi_cmd *, unsigned char *, u64);
extern void iscsit_determine_maxcmdsn(struct iscsi_session *);
extern void iscsit_increment_maxcmdsn(struct iscsi_cmd *, struct iscsi_session *);
#endif /* ISCSI_TARGET_DEVICE_H */
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