1 >>>>>>>>>> The TCM v4 fabric module script generator <<<<<<<<<<
5 This document is intended to be a mini-HOWTO for using the tcm_mod_builder.py
6 script to generate a brand new functional TCM v4 fabric .ko module of your very own,
7 that once built can be immediately be loaded to start access the new TCM/ConfigFS
8 fabric skeleton, by simply using:
11 mkdir -p /sys/kernel/config/target/$TCM_NEW_MOD
13 This script will create a new drivers/target/$TCM_NEW_MOD/, and will do the following
15 *) Generate new API callers for drivers/target/target_core_fabric_configs.c logic
16 ->make_tpg(), ->drop_tpg(), ->make_wwn(), ->drop_wwn(). These are created
17 into $TCM_NEW_MOD/$TCM_NEW_MOD_configfs.c
18 *) Generate basic infrastructure for loading/unloading LKMs and TCM/ConfigFS fabric module
19 using a skeleton struct target_core_fabric_ops API template.
20 *) Based on user defined T10 Proto_Ident for the new fabric module being built,
21 the TransportID / Initiator and Target WWPN related handlers for
22 SPC-3 persistent reservation are automatically generated in $TCM_NEW_MOD/$TCM_NEW_MOD_fabric.c
23 using drivers/target/target_core_fabric_lib.c logic.
24 *) NOP API calls for all other Data I/O path and fabric dependent attribute logic
25 in $TCM_NEW_MOD/$TCM_NEW_MOD_fabric.c
27 tcm_mod_builder.py depends upon the mandatory '-p $PROTO_IDENT' and '-m
28 $FABRIC_MOD_name' parameters, and actually running the script looks like:
30 target:/mnt/sdb/lio-core-2.6.git/Documentation/target# python tcm_mod_builder.py -p iSCSI -m tcm_nab5000
31 tcm_dir: /mnt/sdb/lio-core-2.6.git/Documentation/target/../../
32 Set fabric_mod_name: tcm_nab5000
34 /mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000
35 Using proto_ident: iSCSI
36 Creating fabric_mod_dir:
37 /mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000
39 /mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000/tcm_nab5000_base.h
40 Using tcm_mod_scan_fabric_ops:
41 /mnt/sdb/lio-core-2.6.git/Documentation/target/../../include/target/target_core_fabric_ops.h
43 /mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000/tcm_nab5000_fabric.c
45 /mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000/tcm_nab5000_fabric.h
47 /mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000/tcm_nab5000_configfs.c
49 /mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000/Kbuild
51 /mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000/Kconfig
52 Would you like to add tcm_nab5000to drivers/target/Kbuild..? [yes,no]: yes
53 Would you like to add tcm_nab5000to drivers/target/Kconfig..? [yes,no]: yes
55 At the end of tcm_mod_builder.py. the script will ask to add the following
56 line to drivers/target/Kbuild:
58 obj-$(CONFIG_TCM_NAB5000) += tcm_nab5000/
60 and the same for drivers/target/Kconfig:
62 source "drivers/target/tcm_nab5000/Kconfig"
64 *) Run 'make menuconfig' and select the new CONFIG_TCM_NAB5000 item:
66 <M> TCM_NAB5000 fabric module
68 *) Build using 'make modules', once completed you will have:
70 target:/mnt/sdb/lio-core-2.6.git# ls -la drivers/target/tcm_nab5000/
72 drwxr-xr-x 2 root root 4096 2010-10-05 03:23 .
73 drwxr-xr-x 9 root root 4096 2010-10-05 03:22 ..
74 -rw-r--r-- 1 root root 282 2010-10-05 03:22 Kbuild
75 -rw-r--r-- 1 root root 171 2010-10-05 03:22 Kconfig
76 -rw-r--r-- 1 root root 49 2010-10-05 03:23 modules.order
77 -rw-r--r-- 1 root root 738 2010-10-05 03:22 tcm_nab5000_base.h
78 -rw-r--r-- 1 root root 9096 2010-10-05 03:22 tcm_nab5000_configfs.c
79 -rw-r--r-- 1 root root 191200 2010-10-05 03:23 tcm_nab5000_configfs.o
80 -rw-r--r-- 1 root root 40504 2010-10-05 03:23 .tcm_nab5000_configfs.o.cmd
81 -rw-r--r-- 1 root root 5414 2010-10-05 03:22 tcm_nab5000_fabric.c
82 -rw-r--r-- 1 root root 2016 2010-10-05 03:22 tcm_nab5000_fabric.h
83 -rw-r--r-- 1 root root 190932 2010-10-05 03:23 tcm_nab5000_fabric.o
84 -rw-r--r-- 1 root root 40713 2010-10-05 03:23 .tcm_nab5000_fabric.o.cmd
85 -rw-r--r-- 1 root root 401861 2010-10-05 03:23 tcm_nab5000.ko
86 -rw-r--r-- 1 root root 265 2010-10-05 03:23 .tcm_nab5000.ko.cmd
87 -rw-r--r-- 1 root root 459 2010-10-05 03:23 tcm_nab5000.mod.c
88 -rw-r--r-- 1 root root 23896 2010-10-05 03:23 tcm_nab5000.mod.o
89 -rw-r--r-- 1 root root 22655 2010-10-05 03:23 .tcm_nab5000.mod.o.cmd
90 -rw-r--r-- 1 root root 379022 2010-10-05 03:23 tcm_nab5000.o
91 -rw-r--r-- 1 root root 211 2010-10-05 03:23 .tcm_nab5000.o.cmd
93 *) Load the new module, create a lun_0 configfs group, and add new TCM Core
94 IBLOCK backstore symlink to port:
96 target:/mnt/sdb/lio-core-2.6.git# insmod drivers/target/tcm_nab5000.ko
97 target:/mnt/sdb/lio-core-2.6.git# mkdir -p /sys/kernel/config/target/nab5000/iqn.foo/tpgt_1/lun/lun_0
98 target:/mnt/sdb/lio-core-2.6.git# cd /sys/kernel/config/target/nab5000/iqn.foo/tpgt_1/lun/lun_0/
99 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
101 target:/sys/kernel/config/target/nab5000/iqn.foo/tpgt_1/lun/lun_0# cd -
102 target:/mnt/sdb/lio-core-2.6.git# tree /sys/kernel/config/target/nab5000/
103 /sys/kernel/config/target/nab5000/
111 | | |-- alua_tg_pt_gp
112 | | |-- alua_tg_pt_offline
113 | | |-- alua_tg_pt_status
114 | | |-- alua_tg_pt_write_md
115 | | `-- nab5000_port -> ../../../../../../target/core/iblock_0/lvm_test0
120 target:/mnt/sdb/lio-core-2.6.git# lsmod
123 iscsi_target_mod 193211 0
124 target_core_stgt 8090 0
125 target_core_pscsi 11122 1
126 target_core_file 9172 2
127 target_core_iblock 9280 1
128 target_core_mod 228575 31
129 tcm_nab5000,iscsi_target_mod,target_core_stgt,target_core_pscsi,target_core_file,target_core_iblock
132 scsi_tgt 8666 1 target_core_stgt
133 configfs 20644 2 target_core_mod
135 ----------------------------------------------------------------------
139 *) Add more T10 proto_idents
140 *) Make tcm_mod_dump_fabric_ops() smarter and generate function pointer
141 defs directly from include/target/target_core_fabric_ops.h:struct target_core_fabric_ops
145 Nicholas A. Bellinger <nab@linux-iscsi.org>