aboutsummaryrefslogtreecommitdiff
path: root/Documentation/target/tcm_mod_builder.txt
blob: ae22f70055403d70425711e5fbda19eeea823a94 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
>>>>>>>>>> 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_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>