[PATCH 0/6] [Target_Core_Mod/ALUA]: Add Logical Unit and TargetPort Group infrastructure

From: Nicholas A. Bellinger
Date: Fri Feb 06 2009 - 02:56:42 EST

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Greetings all,

The princible functionality for SPC-3 compliant ALUA Logical Unit and Target Port
groups is now up and running with Target_Core_Mod/ConfigFS and LIO-Target/ConfigFS.
So far, you can create, change, associate ConfigFS objects and release ALUA Logical
Unit and Target Port group abstractions through /sys/kernel/config/target/core/alua.

Changing of alua_access_state via ConfigFS is not supported just yet, but the transition
between Active/Optimized and Active/Non-Optimized should be easy enough.

This patch is made against lio-core-2.6.git/master
and tested on v2.6.29-rc2 x86 32-bit HVM. The lio-core-2.6.git tree can be
found at:

http://git.kernel.org/?p=linux/kernel/git/nab/lio-core-2.6.git;a=summary

Here is what it looks like in action so far:

*) Target ConfigFS side:

# Create a ALUA Logical Unit Group
target:/sys/kernel/config/target/core# mkdir -p alua/lu_gps/lio_lun_group
# Create two ALUA Target Port Groups
target:/sys/kernel/config/target/core# mkdir -p alua/tg_pt_gps/lio_west_group
target:/sys/kernel/config/target/core# mkdir -p alua/tg_pt_gps/lio_east_group
target:/sys/kernel/config/target/core# tree alua/
alua/
|-- lu_gps
| |-- default_lu_gp
| | |-- alua_access_state
| | |-- lu_gp_id
| | `-- members
| `-- lio_lun_group
| |-- alua_access_state
| |-- lu_gp_id
| `-- members
`-- tg_pt_gps
|-- default_tg_pt_gp
| |-- alua_access_state
| |-- members
| `-- tg_pt_gp_id
|-- lio_east_group
| |-- alua_access_state
| |-- members
| `-- tg_pt_gp_id
`-- lio_west_group
|-- alua_access_state
|-- members
`-- tg_pt_gp_id

7 directories, 15 files

# Create an ALUA Logical Unit Group assocation for iblock_0/lvm_test0 to lio_lun_group
target:/sys/kernel/config/target/core# echo lio_lun_group > iblock_0/lvm_test0/alua_lu_gp

# Create an Target Port Group assocation for lio_west_group
target:/sys/kernel/config/target/iscsi/$TARGETNAME/$TPGT/lun/lun_0# echo lio_west_group > alua_tg_pt_gp

# Create an Target Port Group assocation for lio_east_group
target:/sys/kernel/config/target/iscsi/$ANOTHER_TARGETNAME/$TPGT/lun/lun_0# echo lio_east_group > alua_tg_pt_gp

*) From target side dmesg:

Target_Core_ConfigFS: Allocated ALUA Logical Unit Group: core/alua/lu_gps/lio_lun_group, ID: 1
Target_Core_ConfigFS: Allocated ALUA Target Port Group: core/alua/tg_pt_gps/lio_west_group, ID: 1
Target_Core_ConfigFS: Allocated ALUA Target Port Group: core/alua/tg_pt_gps/lio_east_group, ID: 2
Target_Core_ConfigFS: Moving iblock_0/lvm_test0 to ALUA LU Group: core/alua/lu_gps/lio_lun_group, ID: 1
Target_Core_ConfigFS: Moving iqn.2003-01.org.linux-iscsi.target.i686:sn.cff3eedbd2fd/tpgt_1/lun_0 to ALUA Target Port Group: core/alua/tg_pt_gps/lio_east_group, ID: 2
Target_Core_ConfigFS: Moving iqn.2003-01.org.linux-iscsi.target.i686:sn.e475ed6fcdd0/tpgt_1/lun_0 to ALUA Target Port Group: core/alua/tg_pt_gps/lio_west_group, ID: 1

*) From the iSCSI Initiator side connected to LIO-Target v3.0 iSCSI Target Ports using sg3_utils:

# First LIO-Target iSCSI Target port:
initiator# sg_inq -v -l 16384 -p 0x83 /dev/sde
VPD INQUIRY: Device Identification page
inquiry cdb: 12 01 83 00 fc 00
Designation descriptor number 1, descriptor length: 58
id_type: T10 vendor identification, code_set: ASCII
associated with the addressed logical unit
vendor id: LIO-ORG
vendor specific: IBLOCK:eEaqKo-gYF8-vnDA-jJhf-Xqzy-pjGF-G6Y50v
Designation descriptor number 2, descriptor length: 8
transport: Internet SCSI (iSCSI)
id_type: Relative target port, code_set: Binary
associated with the target port
Relative target port: 0x1
Designation descriptor number 3, descriptor length: 8
transport: Internet SCSI (iSCSI)
id_type: Target port group, code_set: Binary
associated with the target port
Target port group: 0x1
Designation descriptor number 4, descriptor length: 8
id_type: Logical unit group, code_set: Binary
associated with the addressed logical unit
Logical unit group: 0x1
Designation descriptor number 5, descriptor length: 72
transport: Internet SCSI (iSCSI)
id_type: SCSI name string, code_set: UTF-8
associated with the target port
SCSI name string:
iqn.2003-01.org.linux-iscsi.target.i686:sn.e475ed6fcdd0,t,0x0001

# Second LIO-Target iSCSI Target Port
initiator# sg_inq -v -l 16384 -p 0x83 /dev/sdf
VPD INQUIRY: Device Identification page
inquiry cdb: 12 01 83 00 fc 00
Designation descriptor number 1, descriptor length: 58
id_type: T10 vendor identification, code_set: ASCII
associated with the addressed logical unit
vendor id: LIO-ORG
vendor specific: IBLOCK:eEaqKo-gYF8-vnDA-jJhf-Xqzy-pjGF-G6Y50v
Designation descriptor number 2, descriptor length: 8
transport: Internet SCSI (iSCSI)
id_type: Relative target port, code_set: Binary
associated with the target port
Relative target port: 0x2
Designation descriptor number 3, descriptor length: 8
transport: Internet SCSI (iSCSI)
id_type: Target port group, code_set: Binary
associated with the target port
Target port group: 0x2
Designation descriptor number 4, descriptor length: 8
id_type: Logical unit group, code_set: Binary
associated with the addressed logical unit
Logical unit group: 0x1
Designation descriptor number 5, descriptor length: 72
transport: Internet SCSI (iSCSI)
id_type: SCSI name string, code_set: UTF-8
associated with the target port
SCSI name string:
iqn.2003-01.org.linux-iscsi.target.i686:sn.cff3eedbd2fd,t,0x0001

# REPORT_TARGET_PORT_GROUPS response data:
initiator# sg_rtpg -v /dev/sde
report target port groups cdb: a3 0a 00 00 00 00 00 00 04 00 00 00
Report list length = 36
Report target port groups:
target port group id : 0x0 , Pref=0
target port group asymmetric access state : 0x00
T_SUP : 0, O_SUP : 0, U_SUP : 0, S_SUP : 0, AN_SUP : 1, AO_SUP : 1
status code : 0x02
vendor unique status : 0x00
target port count : 00
target port group id : 0x1 , Pref=0
target port group asymmetric access state : 0x00
T_SUP : 0, O_SUP : 0, U_SUP : 0, S_SUP : 0, AN_SUP : 1, AO_SUP : 1
status code : 0x02
vendor unique status : 0x00
target port count : 01
Relative target port ids:
0x01
target port group id : 0x2 , Pref=0
target port group asymmetric access state : 0x00
T_SUP : 0, O_SUP : 0, U_SUP : 0, S_SUP : 0, AN_SUP : 1, AO_SUP : 1
status code : 0x02
vendor unique status : 0x00
target port count : 01
Relative target port ids:
0x02

Comments folks..?

--nab

[PATCH 1/6] [Target_Core_Mod/ALUA]: Add support for SPC-3 Target Port and Logical Unit Groups
[PATCH 2/6] [Target_Core_Mod/ALUA]: Add setup for target_core_device.c code
[PATCH 3/6] [Target_Core_Mod]: Update FILEIO and RAMDISK subsystem plugins to SPC-3 revision identifer
[PATCH 4/6] [Target_Core_Mod/ALUA]: Add ALUA struct kmem_caches and update EVPD 0x83 information
[PATCH 5/6] [Target_Core_Mod/ConfigFS]: Add ALUA infrastructure
[PATCH 6/6] [LIO-Target/ConfigFS]: Add ALUA wrapper functions to Target_Core_Mod/ALUA code

>From /pub/scm/linux/kernel/git/nab/lio-core-2.6
* branch master -> FETCH_HEAD
Updating 3466517..07c4589
Fast forward
drivers/lio-core/iscsi_target_configfs.c | 42 +--
drivers/lio-core/target_core_alua.c | 496 +++++++++++++++++++++++----
drivers/lio-core/target_core_alua.h | 14 +
drivers/lio-core/target_core_base.h | 42 +++
drivers/lio-core/target_core_configfs.c | 564 +++++++++++++++++++++++++++++-
drivers/lio-core/target_core_device.c | 16 +
drivers/lio-core/target_core_file.c | 2 +-
drivers/lio-core/target_core_rd.c | 2 +-
drivers/lio-core/target_core_transport.c | 56 +++-
9 files changed, 1113 insertions(+), 121 deletions(-)

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Next message: David Woodhouse: "Re: [PATCH 0/16] DMA-API debugging facility v2"
Previous message: David Miller: "Re: [PATCH v2] tcp: splice as many packets as possible at once"
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