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