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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
+
+ 1) Generate new API callers for drivers/target/target_core_fabric_configs.c logic
+ ->make_tpg(), ->drop_tpg(), ->make_wwn(), ->drop_wwn(). These are created
+ into $TCM_NEW_MOD/$TCM_NEW_MOD_configfs.c
+ 2) Generate basic infrastructure for loading/unloading LKMs and TCM/ConfigFS fabric module
+ using a skeleton struct target_core_fabric_ops API template.
+ 3) 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.
+ 4) 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
+=================
+
+ 1) Add more T10 proto_idents
+ 2) 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>
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.