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[SCSI] target: Add LIO target core v4.0.0-rc6

Browse Source 
LIO target is a full featured in-kernel target framework with the
following feature set:

High-performance, non-blocking, multithreaded architecture with SIMD
support.

Advanced SCSI feature set:

    * Persistent Reservations (PRs)
    * Asymmetric Logical Unit Assignment (ALUA)
    * Protocol and intra-nexus multiplexing, load-balancing and failover (MC/S)
    * Full Error Recovery (ERL=0,1,2)
    * Active/active task migration and session continuation (ERL=2)
    * Thin LUN provisioning (UNMAP and WRITE_SAMExx)

Multiprotocol target plugins

Storage media independence:

    * Virtualization of all storage media; transparent mapping of IO to LUNs
    * No hard limits on number of LUNs per Target; maximum LUN size ~750 TB
    * Backstores: SATA, SAS, SCSI, BluRay, DVD, FLASH, USB, ramdisk, etc.

Standards compliance:

    * Full compliance with IETF (RFC 3720)
    * Full implementation of SPC-4 PRs and ALUA

Significant code cleanups done by Christoph Hellwig.

[jejb: fix up for new block bdev exclusive interface. Minor fixes from
 Randy Dunlap and Dan Carpenter.]
Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Nicholas Bellinger
2010-12-17 11:11:26 -08:00
committed by James Bottomley
parent f4013c3879
commit c66ac9db8d
44 changed files with 30521 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1094
Documentation/target/tcm_mod_builder.py Executable file
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145
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>>>>>>>>>> The TCM v4 fabric module script generator <<<<<<<<<<
Greetings all,
This document is intended to be a mini-HOWTO for using the tcm_mod_builder.py
script to generate a brand new functional TCM v4 fabric .ko module of your very own,
that once built can be immediately be loaded to start access the new TCM/ConfigFS
fabric skeleton, by simply using:
modprobe $TCM_NEW_MOD
mkdir -p /sys/kernel/config/target/$TCM_NEW_MOD
This script will create a new drivers/target/$TCM_NEW_MOD/, and will do the following
*) Generate new API callers for drivers/target/target_core_fabric_configs.c logic
->make_nodeacl(), ->drop_nodeacl(), ->make_tpg(), ->drop_tpg()
->make_wwn(), ->drop_wwn(). These are created into $TCM_NEW_MOD/$TCM_NEW_MOD_configfs.c
*) Generate basic infrastructure for loading/unloading LKMs and TCM/ConfigFS fabric module
using a skeleton struct target_core_fabric_ops API template.
*) Based on user defined T10 Proto_Ident for the new fabric module being built,
the TransportID / Initiator and Target WWPN related handlers for
SPC-3 persistent reservation are automatically generated in $TCM_NEW_MOD/$TCM_NEW_MOD_fabric.c
using drivers/target/target_core_fabric_lib.c logic.
*) NOP API calls for all other Data I/O path and fabric dependent attribute logic
in $TCM_NEW_MOD/$TCM_NEW_MOD_fabric.c
tcm_mod_builder.py depends upon the mandatory '-p $PROTO_IDENT' and '-m
$FABRIC_MOD_name' parameters, and actually running the script looks like:
target:/mnt/sdb/lio-core-2.6.git/Documentation/target# python tcm_mod_builder.py -p iSCSI -m tcm_nab5000
tcm_dir: /mnt/sdb/lio-core-2.6.git/Documentation/target/../../
Set fabric_mod_name: tcm_nab5000
Set fabric_mod_dir:
/mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000
Using proto_ident: iSCSI
Creating fabric_mod_dir:
/mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000
Writing file:
/mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000/tcm_nab5000_base.h
Using tcm_mod_scan_fabric_ops:
/mnt/sdb/lio-core-2.6.git/Documentation/target/../../include/target/target_core_fabric_ops.h
Writing file:
/mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000/tcm_nab5000_fabric.c
Writing file:
/mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000/tcm_nab5000_fabric.h
Writing file:
/mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000/tcm_nab5000_configfs.c
Writing file:
/mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000/Kbuild
Writing file:
/mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000/Kconfig
Would you like to add tcm_nab5000to drivers/target/Kbuild..? [yes,no]: yes
Would you like to add tcm_nab5000to drivers/target/Kconfig..? [yes,no]: yes
At the end of tcm_mod_builder.py. the script will ask to add the following
line to drivers/target/Kbuild:
obj-$(CONFIG_TCM_NAB5000) += tcm_nab5000/
and the same for drivers/target/Kconfig:
source "drivers/target/tcm_nab5000/Kconfig"
*) Run 'make menuconfig' and select the new CONFIG_TCM_NAB5000 item:
<M> TCM_NAB5000 fabric module
*) Build using 'make modules', once completed you will have:
target:/mnt/sdb/lio-core-2.6.git# ls -la drivers/target/tcm_nab5000/
total 1348
drwxr-xr-x 2 root root 4096 2010-10-05 03:23 .
drwxr-xr-x 9 root root 4096 2010-10-05 03:22 ..
-rw-r--r-- 1 root root 282 2010-10-05 03:22 Kbuild
-rw-r--r-- 1 root root 171 2010-10-05 03:22 Kconfig
-rw-r--r-- 1 root root 49 2010-10-05 03:23 modules.order
-rw-r--r-- 1 root root 738 2010-10-05 03:22 tcm_nab5000_base.h
-rw-r--r-- 1 root root 9096 2010-10-05 03:22 tcm_nab5000_configfs.c
-rw-r--r-- 1 root root 191200 2010-10-05 03:23 tcm_nab5000_configfs.o
-rw-r--r-- 1 root root 40504 2010-10-05 03:23 .tcm_nab5000_configfs.o.cmd
-rw-r--r-- 1 root root 5414 2010-10-05 03:22 tcm_nab5000_fabric.c
-rw-r--r-- 1 root root 2016 2010-10-05 03:22 tcm_nab5000_fabric.h
-rw-r--r-- 1 root root 190932 2010-10-05 03:23 tcm_nab5000_fabric.o
-rw-r--r-- 1 root root 40713 2010-10-05 03:23 .tcm_nab5000_fabric.o.cmd
-rw-r--r-- 1 root root 401861 2010-10-05 03:23 tcm_nab5000.ko
-rw-r--r-- 1 root root 265 2010-10-05 03:23 .tcm_nab5000.ko.cmd
-rw-r--r-- 1 root root 459 2010-10-05 03:23 tcm_nab5000.mod.c
-rw-r--r-- 1 root root 23896 2010-10-05 03:23 tcm_nab5000.mod.o
-rw-r--r-- 1 root root 22655 2010-10-05 03:23 .tcm_nab5000.mod.o.cmd
-rw-r--r-- 1 root root 379022 2010-10-05 03:23 tcm_nab5000.o
-rw-r--r-- 1 root root 211 2010-10-05 03:23 .tcm_nab5000.o.cmd
*) Load the new module, create a lun_0 configfs group, and add new TCM Core
IBLOCK backstore symlink to port:
target:/mnt/sdb/lio-core-2.6.git# insmod drivers/target/tcm_nab5000.ko
target:/mnt/sdb/lio-core-2.6.git# mkdir -p /sys/kernel/config/target/nab5000/iqn.foo/tpgt_1/lun/lun_0
target:/mnt/sdb/lio-core-2.6.git# cd /sys/kernel/config/target/nab5000/iqn.foo/tpgt_1/lun/lun_0/
target:/sys/kernel/config/target/nab5000/iqn.foo/tpgt_1/lun/lun_0# ln -s /sys/kernel/config/target/core/iblock_0/lvm_test0 nab5000_port
target:/sys/kernel/config/target/nab5000/iqn.foo/tpgt_1/lun/lun_0# cd -
target:/mnt/sdb/lio-core-2.6.git# tree /sys/kernel/config/target/nab5000/
/sys/kernel/config/target/nab5000/
|-- discovery_auth
|-- iqn.foo
| `-- tpgt_1
| |-- acls
| |-- attrib
| |-- lun
| | `-- lun_0
| | |-- alua_tg_pt_gp
| | |-- alua_tg_pt_offline
| | |-- alua_tg_pt_status
| | |-- alua_tg_pt_write_md
| | `-- nab5000_port -> ../../../../../../target/core/iblock_0/lvm_test0
| |-- np
| `-- param
`-- version
target:/mnt/sdb/lio-core-2.6.git# lsmod
Module Size Used by
tcm_nab5000 3935 4
iscsi_target_mod 193211 0
target_core_stgt 8090 0
target_core_pscsi 11122 1
target_core_file 9172 2
target_core_iblock 9280 1
target_core_mod 228575 31
tcm_nab5000,iscsi_target_mod,target_core_stgt,target_core_pscsi,target_core_file,target_core_iblock
libfc 73681 0
scsi_debug 56265 0
scsi_tgt 8666 1 target_core_stgt
configfs 20644 2 target_core_mod
----------------------------------------------------------------------
Future TODO items:
*) Add more T10 proto_idents
*) Make tcm_mod_dump_fabric_ops() smarter and generate function pointer
defs directly from include/target/target_core_fabric_ops.h:struct target_core_fabric_ops
structure members.
October 5th, 2010
Nicholas A. Bellinger <nab@linux-iscsi.org>

2
drivers/Kconfig
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@@ -26,6 +26,8 @@ source "drivers/ata/Kconfig"
source "drivers/md/Kconfig"
source "drivers/target/Kconfig"
source "drivers/message/fusion/Kconfig"
source "drivers/firewire/Kconfig"

1
drivers/Makefile
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@@ -46,6 +46,7 @@ obj-y += macintosh/
obj-$(CONFIG_IDE) += ide/
obj-$(CONFIG_SCSI) += scsi/
obj-$(CONFIG_ATA) += ata/
obj-$(CONFIG_TARGET_CORE) += target/
obj-$(CONFIG_MTD) += mtd/
obj-$(CONFIG_SPI) += spi/
obj-y += net/

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menuconfig TARGET_CORE
tristate "Generic Target Core Mod (TCM) and ConfigFS Infrastructure"
depends on SCSI && BLOCK
select CONFIGFS_FS
default n
help
Say Y or M here to enable the TCM Storage Engine and ConfigFS enabled
control path for target_core_mod. This includes built-in TCM RAMDISK
subsystem logic for virtual LUN 0 access
if TARGET_CORE
config TCM_IBLOCK
tristate "TCM/IBLOCK Subsystem Plugin for Linux/BLOCK"
help
Say Y here to enable the TCM/IBLOCK subsystem plugin for non-buffered
access to Linux/Block devices using BIO
config TCM_FILEIO
tristate "TCM/FILEIO Subsystem Plugin for Linux/VFS"
help
Say Y here to enable the TCM/FILEIO subsystem plugin for buffered
access to Linux/VFS struct file or struct block_device
config TCM_PSCSI
tristate "TCM/pSCSI Subsystem Plugin for Linux/SCSI"
help
Say Y here to enable the TCM/pSCSI subsystem plugin for non-buffered
passthrough access to Linux/SCSI device
endif

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EXTRA_CFLAGS += -I$(srctree)/drivers/target/ -I$(srctree)/drivers/scsi/
target_core_mod-y := target_core_configfs.o \
target_core_device.o \
target_core_fabric_configfs.o \
target_core_fabric_lib.o \
target_core_hba.o \
target_core_pr.o \
target_core_alua.o \
target_core_scdb.o \
target_core_tmr.o \
target_core_tpg.o \
target_core_transport.o \
target_core_cdb.o \
target_core_ua.o \
target_core_rd.o \
target_core_mib.o
obj-$(CONFIG_TARGET_CORE) += target_core_mod.o
# Subsystem modules
obj-$(CONFIG_TCM_IBLOCK) += target_core_iblock.o
obj-$(CONFIG_TCM_FILEIO) += target_core_file.o
obj-$(CONFIG_TCM_PSCSI) += target_core_pscsi.o

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drivers/target/target_core_alua.h Normal file
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#ifndef TARGET_CORE_ALUA_H
#define TARGET_CORE_ALUA_H
/*
* INQUIRY response data, TPGS Field
*
* from spc4r17 section 6.4.2 Table 135
*/
#define TPGS_NO_ALUA 0x00
#define TPGS_IMPLICT_ALUA 0x10
#define TPGS_EXPLICT_ALUA 0x20
/*
* ASYMMETRIC ACCESS STATE field
*
* from spc4r17 section 6.27 Table 245
*/
#define ALUA_ACCESS_STATE_ACTIVE_OPTMIZED 0x0
#define ALUA_ACCESS_STATE_ACTIVE_NON_OPTIMIZED 0x1
#define ALUA_ACCESS_STATE_STANDBY 0x2
#define ALUA_ACCESS_STATE_UNAVAILABLE 0x3
#define ALUA_ACCESS_STATE_OFFLINE 0xe
#define ALUA_ACCESS_STATE_TRANSITION 0xf
/*
* REPORT_TARGET_PORT_GROUP STATUS CODE
*
* from spc4r17 section 6.27 Table 246
*/
#define ALUA_STATUS_NONE 0x00
#define ALUA_STATUS_ALTERED_BY_EXPLICT_STPG 0x01
#define ALUA_STATUS_ALTERED_BY_IMPLICT_ALUA 0x02
/*
* From spc4r17, Table D.1: ASC and ASCQ Assignement
*/
#define ASCQ_04H_ALUA_STATE_TRANSITION 0x0a
#define ASCQ_04H_ALUA_TG_PT_STANDBY 0x0b
#define ASCQ_04H_ALUA_TG_PT_UNAVAILABLE 0x0c
#define ASCQ_04H_ALUA_OFFLINE 0x12
/*
* Used as the default for Active/NonOptimized delay (in milliseconds)
* This can also be changed via configfs on a per target port group basis..
*/
#define ALUA_DEFAULT_NONOP_DELAY_MSECS 100
#define ALUA_MAX_NONOP_DELAY_MSECS 10000 /* 10 seconds */
/*
* Used for implict and explict ALUA transitional delay, that is disabled
* by default, and is intended to be used for debugging client side ALUA code.
*/
#define ALUA_DEFAULT_TRANS_DELAY_MSECS 0
#define ALUA_MAX_TRANS_DELAY_MSECS 30000 /* 30 seconds */
/*
* Used by core_alua_update_tpg_primary_metadata() and
* core_alua_update_tpg_secondary_metadata()
*/
#define ALUA_METADATA_PATH_LEN 512
/*
* Used by core_alua_update_tpg_secondary_metadata()
*/
#define ALUA_SECONDARY_METADATA_WWN_LEN 256
extern struct kmem_cache *t10_alua_lu_gp_cache;
extern struct kmem_cache *t10_alua_lu_gp_mem_cache;
extern struct kmem_cache *t10_alua_tg_pt_gp_cache;
extern struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
extern int core_emulate_report_target_port_groups(struct se_cmd *);
extern int core_emulate_set_target_port_groups(struct se_cmd *);
extern int core_alua_check_nonop_delay(struct se_cmd *);
extern int core_alua_do_port_transition(struct t10_alua_tg_pt_gp *,
struct se_device *, struct se_port *,
struct se_node_acl *, int, int);
extern char *core_alua_dump_status(int);
extern struct t10_alua_lu_gp *core_alua_allocate_lu_gp(const char *, int);
extern int core_alua_set_lu_gp_id(struct t10_alua_lu_gp *, u16);
extern void core_alua_free_lu_gp(struct t10_alua_lu_gp *);
extern void core_alua_free_lu_gp_mem(struct se_device *);
extern struct t10_alua_lu_gp *core_alua_get_lu_gp_by_name(const char *);
extern void core_alua_put_lu_gp_from_name(struct t10_alua_lu_gp *);
extern void __core_alua_attach_lu_gp_mem(struct t10_alua_lu_gp_member *,
struct t10_alua_lu_gp *);
extern void __core_alua_drop_lu_gp_mem(struct t10_alua_lu_gp_member *,
struct t10_alua_lu_gp *);
extern void core_alua_drop_lu_gp_dev(struct se_device *);
extern struct t10_alua_tg_pt_gp *core_alua_allocate_tg_pt_gp(
struct se_subsystem_dev *, const char *, int);
extern int core_alua_set_tg_pt_gp_id(struct t10_alua_tg_pt_gp *, u16);
extern struct t10_alua_tg_pt_gp_member *core_alua_allocate_tg_pt_gp_mem(
struct se_port *);
extern void core_alua_free_tg_pt_gp(struct t10_alua_tg_pt_gp *);
extern void core_alua_free_tg_pt_gp_mem(struct se_port *);
extern void __core_alua_attach_tg_pt_gp_mem(struct t10_alua_tg_pt_gp_member *,
struct t10_alua_tg_pt_gp *);
extern ssize_t core_alua_show_tg_pt_gp_info(struct se_port *, char *);
extern ssize_t core_alua_store_tg_pt_gp_info(struct se_port *, const char *,
size_t);
extern ssize_t core_alua_show_access_type(struct t10_alua_tg_pt_gp *, char *);
extern ssize_t core_alua_store_access_type(struct t10_alua_tg_pt_gp *,
const char *, size_t);
extern ssize_t core_alua_show_nonop_delay_msecs(struct t10_alua_tg_pt_gp *,
char *);
extern ssize_t core_alua_store_nonop_delay_msecs(struct t10_alua_tg_pt_gp *,
const char *, size_t);
extern ssize_t core_alua_show_trans_delay_msecs(struct t10_alua_tg_pt_gp *,
char *);
extern ssize_t core_alua_store_trans_delay_msecs(struct t10_alua_tg_pt_gp *,
const char *, size_t);
extern ssize_t core_alua_show_preferred_bit(struct t10_alua_tg_pt_gp *,
char *);
extern ssize_t core_alua_store_preferred_bit(struct t10_alua_tg_pt_gp *,
const char *, size_t);
extern ssize_t core_alua_show_offline_bit(struct se_lun *, char *);
extern ssize_t core_alua_store_offline_bit(struct se_lun *, const char *,
size_t);
extern ssize_t core_alua_show_secondary_status(struct se_lun *, char *);
extern ssize_t core_alua_store_secondary_status(struct se_lun *,
const char *, size_t);
extern ssize_t core_alua_show_secondary_write_metadata(struct se_lun *,
char *);
extern ssize_t core_alua_store_secondary_write_metadata(struct se_lun *,
const char *, size_t);
extern int core_setup_alua(struct se_device *, int);
#endif /* TARGET_CORE_ALUA_H */

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451
drivers/target/target_core_fabric_lib.c Normal file
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@@ -0,0 +1,451 @@
/*******************************************************************************
* Filename: target_core_fabric_lib.c
*
* This file contains generic high level protocol identifier and PR
* handlers for TCM fabric modules
*
* Copyright (c) 2010 Rising Tide Systems, Inc.
* Copyright (c) 2010 Linux-iSCSI.org
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
******************************************************************************/
#include <linux/string.h>
#include <linux/ctype.h>
#include <linux/spinlock.h>
#include <linux/smp_lock.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <target/target_core_base.h>
#include <target/target_core_device.h>
#include <target/target_core_transport.h>
#include <target/target_core_fabric_ops.h>
#include <target/target_core_configfs.h>
#include "target_core_hba.h"
#include "target_core_pr.h"
/*
* Handlers for Serial Attached SCSI (SAS)
*/
u8 sas_get_fabric_proto_ident(struct se_portal_group *se_tpg)
{
/*
* Return a SAS Serial SCSI Protocol identifier for loopback operations
* This is defined in section 7.5.1 Table 362 in spc4r17
*/
return 0x6;
}
EXPORT_SYMBOL(sas_get_fabric_proto_ident);
u32 sas_get_pr_transport_id(
struct se_portal_group *se_tpg,
struct se_node_acl *se_nacl,
struct t10_pr_registration *pr_reg,
int *format_code,
unsigned char *buf)
{
unsigned char binary, *ptr;
int i;
u32 off = 4;
/*
* Set PROTOCOL IDENTIFIER to 6h for SAS
*/
buf[0] = 0x06;
/*
* From spc4r17, 7.5.4.7 TransportID for initiator ports using SCSI
* over SAS Serial SCSI Protocol
*/
ptr = &se_nacl->initiatorname[4]; /* Skip over 'naa. prefix */
for (i = 0; i < 16; i += 2) {
binary = transport_asciihex_to_binaryhex(&ptr[i]);
buf[off++] = binary;
}
/*
* The SAS Transport ID is a hardcoded 24-byte length
*/
return 24;
}
EXPORT_SYMBOL(sas_get_pr_transport_id);
u32 sas_get_pr_transport_id_len(
struct se_portal_group *se_tpg,
struct se_node_acl *se_nacl,
struct t10_pr_registration *pr_reg,
int *format_code)
{
*format_code = 0;
/*
* From spc4r17, 7.5.4.7 TransportID for initiator ports using SCSI
* over SAS Serial SCSI Protocol
*
* The SAS Transport ID is a hardcoded 24-byte length
*/
return 24;
}
EXPORT_SYMBOL(sas_get_pr_transport_id_len);
/*
* Used for handling SCSI fabric dependent TransportIDs in SPC-3 and above
* Persistent Reservation SPEC_I_PT=1 and PROUT REGISTER_AND_MOVE operations.
*/
char *sas_parse_pr_out_transport_id(
struct se_portal_group *se_tpg,
const char *buf,
u32 *out_tid_len,
char **port_nexus_ptr)
{
/*
* Assume the FORMAT CODE 00b from spc4r17, 7.5.4.7 TransportID
* for initiator ports using SCSI over SAS Serial SCSI Protocol
*
* The TransportID for a SAS Initiator Port is of fixed size of
* 24 bytes, and SAS does not contain a I_T nexus identifier,
* so we return the **port_nexus_ptr set to NULL.
*/
*port_nexus_ptr = NULL;
*out_tid_len = 24;
return (char *)&buf[4];
}
EXPORT_SYMBOL(sas_parse_pr_out_transport_id);
/*
* Handlers for Fibre Channel Protocol (FCP)
*/
u8 fc_get_fabric_proto_ident(struct se_portal_group *se_tpg)
{
return 0x0; /* 0 = fcp-2 per SPC4 section 7.5.1 */
}
EXPORT_SYMBOL(fc_get_fabric_proto_ident);
u32 fc_get_pr_transport_id_len(
struct se_portal_group *se_tpg,
struct se_node_acl *se_nacl,
struct t10_pr_registration *pr_reg,
int *format_code)
{
*format_code = 0;
/*
* The FC Transport ID is a hardcoded 24-byte length
*/
return 24;
}
EXPORT_SYMBOL(fc_get_pr_transport_id_len);
u32 fc_get_pr_transport_id(
struct se_portal_group *se_tpg,
struct se_node_acl *se_nacl,
struct t10_pr_registration *pr_reg,
int *format_code,
unsigned char *buf)
{
unsigned char binary, *ptr;
int i;
u32 off = 8;
/*
* PROTOCOL IDENTIFIER is 0h for FCP-2
*
* From spc4r17, 7.5.4.2 TransportID for initiator ports using
* SCSI over Fibre Channel
*
* We convert the ASCII formatted N Port name into a binary
* encoded TransportID.
*/
ptr = &se_nacl->initiatorname[0];
for (i = 0; i < 24; ) {
if (!(strncmp(&ptr[i], ":", 1))) {
i++;
continue;
}
binary = transport_asciihex_to_binaryhex(&ptr[i]);
buf[off++] = binary;
i += 2;
}
/*
* The FC Transport ID is a hardcoded 24-byte length
*/
return 24;
}
EXPORT_SYMBOL(fc_get_pr_transport_id);
char *fc_parse_pr_out_transport_id(
struct se_portal_group *se_tpg,
const char *buf,
u32 *out_tid_len,
char **port_nexus_ptr)
{
/*
* The TransportID for a FC N Port is of fixed size of
* 24 bytes, and FC does not contain a I_T nexus identifier,
* so we return the **port_nexus_ptr set to NULL.
*/
*port_nexus_ptr = NULL;
*out_tid_len = 24;
return (char *)&buf[8];
}
EXPORT_SYMBOL(fc_parse_pr_out_transport_id);
/*
* Handlers for Internet Small Computer Systems Interface (iSCSI)
*/
u8 iscsi_get_fabric_proto_ident(struct se_portal_group *se_tpg)
{
/*
* This value is defined for "Internet SCSI (iSCSI)"
* in spc4r17 section 7.5.1 Table 362
*/
return 0x5;
}
EXPORT_SYMBOL(iscsi_get_fabric_proto_ident);
u32 iscsi_get_pr_transport_id(
struct se_portal_group *se_tpg,
struct se_node_acl *se_nacl,
struct t10_pr_registration *pr_reg,
int *format_code,
unsigned char *buf)
{
u32 off = 4, padding = 0;
u16 len = 0;
spin_lock_irq(&se_nacl->nacl_sess_lock);
/*
* Set PROTOCOL IDENTIFIER to 5h for iSCSI
*/
buf[0] = 0x05;
/*
* From spc4r17 Section 7.5.4.6: TransportID for initiator
* ports using SCSI over iSCSI.
*
* The null-terminated, null-padded (see 4.4.2) ISCSI NAME field
* shall contain the iSCSI name of an iSCSI initiator node (see
* RFC 3720). The first ISCSI NAME field byte containing an ASCII
* null character terminates the ISCSI NAME field without regard for
* the specified length of the iSCSI TransportID or the contents of
* the ADDITIONAL LENGTH field.
*/
len = sprintf(&buf[off], "%s", se_nacl->initiatorname);
/*
* Add Extra byte for NULL terminator
*/
len++;
/*
* If there is ISID present with the registration and *format code == 1
* 1, use iSCSI Initiator port TransportID format.
*
* Otherwise use iSCSI Initiator device TransportID format that
* does not contain the ASCII encoded iSCSI Initiator iSID value
* provied by the iSCSi Initiator during the iSCSI login process.
*/
if ((*format_code == 1) && (pr_reg->isid_present_at_reg)) {
/*
* Set FORMAT CODE 01b for iSCSI Initiator port TransportID
* format.
*/
buf[0] |= 0x40;
/*
* From spc4r17 Section 7.5.4.6: TransportID for initiator
* ports using SCSI over iSCSI. Table 390
*
* The SEPARATOR field shall contain the five ASCII
* characters ",i,0x".
*
* The null-terminated, null-padded ISCSI INITIATOR SESSION ID
* field shall contain the iSCSI initiator session identifier
* (see RFC 3720) in the form of ASCII characters that are the
* hexadecimal digits converted from the binary iSCSI initiator
* session identifier value. The first ISCSI INITIATOR SESSION
* ID field byte containing an ASCII null character
*/
buf[off+len] = 0x2c; off++; /* ASCII Character: "," */
buf[off+len] = 0x69; off++; /* ASCII Character: "i" */
buf[off+len] = 0x2c; off++; /* ASCII Character: "," */
buf[off+len] = 0x30; off++; /* ASCII Character: "0" */
buf[off+len] = 0x78; off++; /* ASCII Character: "x" */
len += 5;
buf[off+len] = pr_reg->pr_reg_isid[0]; off++;
buf[off+len] = pr_reg->pr_reg_isid[1]; off++;
buf[off+len] = pr_reg->pr_reg_isid[2]; off++;
buf[off+len] = pr_reg->pr_reg_isid[3]; off++;
buf[off+len] = pr_reg->pr_reg_isid[4]; off++;
buf[off+len] = pr_reg->pr_reg_isid[5]; off++;
buf[off+len] = '\0'; off++;
len += 7;
}
spin_unlock_irq(&se_nacl->nacl_sess_lock);
/*
* The ADDITIONAL LENGTH field specifies the number of bytes that follow
* in the TransportID. The additional length shall be at least 20 and
* shall be a multiple of four.
*/
padding = ((-len) & 3);
if (padding != 0)
len += padding;
buf[2] = ((len >> 8) & 0xff);
buf[3] = (len & 0xff);
/*
* Increment value for total payload + header length for
* full status descriptor
*/
len += 4;
return len;
}
EXPORT_SYMBOL(iscsi_get_pr_transport_id);
u32 iscsi_get_pr_transport_id_len(
struct se_portal_group *se_tpg,
struct se_node_acl *se_nacl,
struct t10_pr_registration *pr_reg,
int *format_code)
{
u32 len = 0, padding = 0;
spin_lock_irq(&se_nacl->nacl_sess_lock);
len = strlen(se_nacl->initiatorname);
/*
* Add extra byte for NULL terminator
*/
len++;
/*
* If there is ISID present with the registration, use format code:
* 01b: iSCSI Initiator port TransportID format
*
* If there is not an active iSCSI session, use format code:
* 00b: iSCSI Initiator device TransportID format
*/
if (pr_reg->isid_present_at_reg) {
len += 5; /* For ",i,0x" ASCII seperator */
len += 7; /* For iSCSI Initiator Session ID + Null terminator */
*format_code = 1;
} else
*format_code = 0;
spin_unlock_irq(&se_nacl->nacl_sess_lock);
/*
* The ADDITIONAL LENGTH field specifies the number of bytes that follow
* in the TransportID. The additional length shall be at least 20 and
* shall be a multiple of four.
*/
padding = ((-len) & 3);
if (padding != 0)
len += padding;
/*
* Increment value for total payload + header length for
* full status descriptor
*/
len += 4;
return len;
}
EXPORT_SYMBOL(iscsi_get_pr_transport_id_len);
char *iscsi_parse_pr_out_transport_id(
struct se_portal_group *se_tpg,
const char *buf,
u32 *out_tid_len,
char **port_nexus_ptr)
{
char *p;
u32 tid_len, padding;
int i;
u16 add_len;
u8 format_code = (buf[0] & 0xc0);
/*
* Check for FORMAT CODE 00b or 01b from spc4r17, section 7.5.4.6:
*
* TransportID for initiator ports using SCSI over iSCSI,
* from Table 388 -- iSCSI TransportID formats.
*
* 00b Initiator port is identified using the world wide unique
* SCSI device name of the iSCSI initiator
* device containing the initiator port (see table 389).
* 01b Initiator port is identified using the world wide unique
* initiator port identifier (see table 390).10b to 11b
* Reserved
*/
if ((format_code != 0x00) && (format_code != 0x40)) {
printk(KERN_ERR "Illegal format code: 0x%02x for iSCSI"
" Initiator Transport ID\n", format_code);
return NULL;
}
/*
* If the caller wants the TransportID Length, we set that value for the
* entire iSCSI Tarnsport ID now.
*/
if (out_tid_len != NULL) {
add_len = ((buf[2] >> 8) & 0xff);
add_len |= (buf[3] & 0xff);
tid_len = strlen((char *)&buf[4]);
tid_len += 4; /* Add four bytes for iSCSI Transport ID header */
tid_len += 1; /* Add one byte for NULL terminator */
padding = ((-tid_len) & 3);
if (padding != 0)
tid_len += padding;
if ((add_len + 4) != tid_len) {
printk(KERN_INFO "LIO-Target Extracted add_len: %hu "
"does not match calculated tid_len: %u,"
" using tid_len instead\n", add_len+4, tid_len);
*out_tid_len = tid_len;
} else
*out_tid_len = (add_len + 4);
}
/*
* Check for ',i,0x' seperator between iSCSI Name and iSCSI Initiator
* Session ID as defined in Table 390 - iSCSI initiator port TransportID
* format.
*/
if (format_code == 0x40) {
p = strstr((char *)&buf[4], ",i,0x");
if (!(p)) {
printk(KERN_ERR "Unable to locate \",i,0x\" seperator"
" for Initiator port identifier: %s\n",
(char *)&buf[4]);
return NULL;
}
*p = '\0'; /* Terminate iSCSI Name */
p += 5; /* Skip over ",i,0x" seperator */
*port_nexus_ptr = p;
/*
* Go ahead and do the lower case conversion of the received
* 12 ASCII characters representing the ISID in the TransportID
* for comparision against the running iSCSI session's ISID from
* iscsi_target.c:lio_sess_get_initiator_sid()
*/
for (i = 0; i < 12; i++) {
if (isdigit(*p)) {
p++;
continue;
}
*p = tolower(*p);
p++;
}
}
return (char *)&buf[4];
}
EXPORT_SYMBOL(iscsi_parse_pr_out_transport_id);

688
drivers/target/target_core_file.c Normal file
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50
drivers/target/target_core_file.h Normal file
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@@ -0,0 +1,50 @@
#ifndef TARGET_CORE_FILE_H
#define TARGET_CORE_FILE_H
#define FD_VERSION "4.0"
#define FD_MAX_DEV_NAME 256
/* Maximum queuedepth for the FILEIO HBA */
#define FD_HBA_QUEUE_DEPTH 256
#define FD_DEVICE_QUEUE_DEPTH 32
#define FD_MAX_DEVICE_QUEUE_DEPTH 128
#define FD_BLOCKSIZE 512
#define FD_MAX_SECTORS 1024
#define RRF_EMULATE_CDB 0x01
#define RRF_GOT_LBA 0x02
struct fd_request {
struct se_task fd_task;
/* SCSI CDB from iSCSI Command PDU */
unsigned char fd_scsi_cdb[TCM_MAX_COMMAND_SIZE];
/* FILEIO device */
struct fd_dev *fd_dev;
} ____cacheline_aligned;
#define FBDF_HAS_PATH 0x01
#define FBDF_HAS_SIZE 0x02
#define FDBD_USE_BUFFERED_IO 0x04
struct fd_dev {
u32 fbd_flags;
unsigned char fd_dev_name[FD_MAX_DEV_NAME];
/* Unique Ramdisk Device ID in Ramdisk HBA */
u32 fd_dev_id;
/* Number of SG tables in sg_table_array */
u32 fd_table_count;
u32 fd_queue_depth;
u32 fd_block_size;
unsigned long long fd_dev_size;
struct file *fd_file;
/* FILEIO HBA device is connected to */
struct fd_host *fd_host;
} ____cacheline_aligned;
struct fd_host {
u32 fd_host_dev_id_count;
/* Unique FILEIO Host ID */
u32 fd_host_id;
} ____cacheline_aligned;
#endif /* TARGET_CORE_FILE_H */

185
drivers/target/target_core_hba.c Normal file
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@@ -0,0 +1,185 @@
/*******************************************************************************
* Filename: target_core_hba.c
*
* This file copntains the iSCSI HBA Transport related functions.
*
* Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc.
* Copyright (c) 2005, 2006, 2007 SBE, Inc.
* Copyright (c) 2007-2010 Rising Tide Systems
* Copyright (c) 2008-2010 Linux-iSCSI.org
*
* Nicholas A. Bellinger <nab@kernel.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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
******************************************************************************/
#include <linux/net.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/smp_lock.h>
#include <linux/in.h>
#include <net/sock.h>
#include <net/tcp.h>
#include <target/target_core_base.h>
#include <target/target_core_device.h>
#include <target/target_core_device.h>
#include <target/target_core_tpg.h>
#include <target/target_core_transport.h>
#include "target_core_hba.h"
static LIST_HEAD(subsystem_list);
static DEFINE_MUTEX(subsystem_mutex);
int transport_subsystem_register(struct se_subsystem_api *sub_api)
{
struct se_subsystem_api *s;
INIT_LIST_HEAD(&sub_api->sub_api_list);
mutex_lock(&subsystem_mutex);
list_for_each_entry(s, &subsystem_list, sub_api_list) {
if (!(strcmp(s->name, sub_api->name))) {
printk(KERN_ERR "%p is already registered with"
" duplicate name %s, unable to process"
" request\n", s, s->name);
mutex_unlock(&subsystem_mutex);
return -EEXIST;
}
}
list_add_tail(&sub_api->sub_api_list, &subsystem_list);
mutex_unlock(&subsystem_mutex);
printk(KERN_INFO "TCM: Registered subsystem plugin: %s struct module:"
" %p\n", sub_api->name, sub_api->owner);
return 0;
}
EXPORT_SYMBOL(transport_subsystem_register);
void transport_subsystem_release(struct se_subsystem_api *sub_api)
{
mutex_lock(&subsystem_mutex);
list_del(&sub_api->sub_api_list);
mutex_unlock(&subsystem_mutex);
}
EXPORT_SYMBOL(transport_subsystem_release);
static struct se_subsystem_api *core_get_backend(const char *sub_name)
{
struct se_subsystem_api *s;
mutex_lock(&subsystem_mutex);
list_for_each_entry(s, &subsystem_list, sub_api_list) {
if (!strcmp(s->name, sub_name))
goto found;
}
mutex_unlock(&subsystem_mutex);
return NULL;
found:
if (s->owner && !try_module_get(s->owner))
s = NULL;
mutex_unlock(&subsystem_mutex);
return s;
}
struct se_hba *
core_alloc_hba(const char *plugin_name, u32 plugin_dep_id, u32 hba_flags)
{
struct se_hba *hba;
int ret = 0;
hba = kzalloc(sizeof(*hba), GFP_KERNEL);
if (!hba) {
printk(KERN_ERR "Unable to allocate struct se_hba\n");
return ERR_PTR(-ENOMEM);
}
INIT_LIST_HEAD(&hba->hba_dev_list);
spin_lock_init(&hba->device_lock);
spin_lock_init(&hba->hba_queue_lock);
mutex_init(&hba->hba_access_mutex);
hba->hba_index = scsi_get_new_index(SCSI_INST_INDEX);
hba->hba_flags |= hba_flags;
atomic_set(&hba->max_queue_depth, 0);
atomic_set(&hba->left_queue_depth, 0);
hba->transport = core_get_backend(plugin_name);
if (!hba->transport) {
ret = -EINVAL;
goto out_free_hba;
}
ret = hba->transport->attach_hba(hba, plugin_dep_id);
if (ret < 0)
goto out_module_put;
spin_lock(&se_global->hba_lock);
hba->hba_id = se_global->g_hba_id_counter++;
list_add_tail(&hba->hba_list, &se_global->g_hba_list);
spin_unlock(&se_global->hba_lock);
printk(KERN_INFO "CORE_HBA[%d] - Attached HBA to Generic Target"
" Core\n", hba->hba_id);
return hba;
out_module_put:
if (hba->transport->owner)
module_put(hba->transport->owner);
hba->transport = NULL;
out_free_hba:
kfree(hba);
return ERR_PTR(ret);
}
int
core_delete_hba(struct se_hba *hba)
{
struct se_device *dev, *dev_tmp;
spin_lock(&hba->device_lock);
list_for_each_entry_safe(dev, dev_tmp, &hba->hba_dev_list, dev_list) {
se_clear_dev_ports(dev);
spin_unlock(&hba->device_lock);
se_release_device_for_hba(dev);
spin_lock(&hba->device_lock);
}
spin_unlock(&hba->device_lock);
hba->transport->detach_hba(hba);
spin_lock(&se_global->hba_lock);
list_del(&hba->hba_list);
spin_unlock(&se_global->hba_lock);
printk(KERN_INFO "CORE_HBA[%d] - Detached HBA from Generic Target"
" Core\n", hba->hba_id);
if (hba->transport->owner)
module_put(hba->transport->owner);
hba->transport = NULL;
kfree(hba);
return 0;
}

7
drivers/target/target_core_hba.h Normal file
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@@ -0,0 +1,7 @@
#ifndef TARGET_CORE_HBA_H
#define TARGET_CORE_HBA_H
extern struct se_hba *core_alloc_hba(const char *, u32, u32);
extern int core_delete_hba(struct se_hba *);
#endif /* TARGET_CORE_HBA_H */

808
drivers/target/target_core_iblock.c Normal file
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40
drivers/target/target_core_iblock.h Normal file
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#ifndef TARGET_CORE_IBLOCK_H
#define TARGET_CORE_IBLOCK_H
#define IBLOCK_VERSION "4.0"
#define IBLOCK_HBA_QUEUE_DEPTH 512
#define IBLOCK_DEVICE_QUEUE_DEPTH 32
#define IBLOCK_MAX_DEVICE_QUEUE_DEPTH 128
#define IBLOCK_MAX_CDBS 16
#define IBLOCK_LBA_SHIFT 9
struct iblock_req {
struct se_task ib_task;
unsigned char ib_scsi_cdb[TCM_MAX_COMMAND_SIZE];
atomic_t ib_bio_cnt;
atomic_t ib_bio_err_cnt;
struct bio *ib_bio;
struct iblock_dev *ib_dev;
} ____cacheline_aligned;
#define IBDF_HAS_UDEV_PATH 0x01
#define IBDF_HAS_FORCE 0x02
struct iblock_dev {
unsigned char ibd_udev_path[SE_UDEV_PATH_LEN];
int ibd_force;
int ibd_major;
int ibd_minor;
u32 ibd_depth;
u32 ibd_flags;
struct bio_set *ibd_bio_set;
struct block_device *ibd_bd;
struct iblock_hba *ibd_host;
} ____cacheline_aligned;
struct iblock_hba {
int iblock_host_id;
} ____cacheline_aligned;
#endif /* TARGET_CORE_IBLOCK_H */

1078
drivers/target/target_core_mib.c Normal file
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