Documentation/target/tcm_mod_builder.txt

   1 >>>>>>>>>> The TCM v4 fabric module script generator <<<<<<<<<<
   2
   3 Greetings all,
   4
   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:
   9
  10         modprobe $TCM_NEW_MOD
  11         mkdir -p /sys/kernel/config/target/$TCM_NEW_MOD
  12
  13 This script will create a new drivers/target/$TCM_NEW_MOD/, and will do the following
  14
  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
  26
  27 tcm_mod_builder.py depends upon the mandatory '-p $PROTO_IDENT' and '-m
  28 $FABRIC_MOD_name' parameters, and actually running the script looks like:
  29
  30 target:/mnt/sdb/lio-core-2.6.git/Documentation/target# python tcm_mod_builder.py -p iSCSI -m tcm_nab5000
  31 tcm_dir: /mnt/sdb/lio-core-2.6.git/Documentation/target/../../
  32 Set fabric_mod_name: tcm_nab5000
  33 Set fabric_mod_dir:
  34 /mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000
  35 Using proto_ident: iSCSI
  36 Creating fabric_mod_dir:
  37 /mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000
  38 Writing file:
  39 /mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000/tcm_nab5000_base.h
  40 Using tcm_mod_scan_fabric_ops:
  41 /mnt/sdb/lio-core-2.6.git/Documentation/target/../../include/target/target_core_fabric_ops.h
  42 Writing file:
  43 /mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000/tcm_nab5000_fabric.c
  44 Writing file:
  45 /mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000/tcm_nab5000_fabric.h
  46 Writing file:
  47 /mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000/tcm_nab5000_configfs.c
  48 Writing file:
  49 /mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000/Kbuild
  50 Writing file:
  51 /mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000/Kconfig
  52 Would you like to add tcm_nab5000to drivers/target/Kbuild..? [yes,no]: yes
  53 Would you like to add tcm_nab5000to drivers/target/Kconfig..? [yes,no]: yes
  54
  55 At the end of tcm_mod_builder.py. the script will ask to add the following
  56 line to drivers/target/Kbuild:
  57
  58         obj-$(CONFIG_TCM_NAB5000)       += tcm_nab5000/
  59
  60 and the same for drivers/target/Kconfig:
  61
  62         source "drivers/target/tcm_nab5000/Kconfig"
  63
  64 *) Run 'make menuconfig' and select the new CONFIG_TCM_NAB5000 item:
  65
  66         <M>   TCM_NAB5000 fabric module
  67
  68 *) Build using 'make modules', once completed you will have:
  69
  70 target:/mnt/sdb/lio-core-2.6.git# ls -la drivers/target/tcm_nab5000/
  71 total 1348
  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
  92
  93 *) Load the new module, create a lun_0 configfs group, and add new TCM Core
  94    IBLOCK backstore symlink to port:
  95
  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
 100
 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/
 104 |-- discovery_auth
 105 |-- iqn.foo
 106 |   `-- tpgt_1
 107 |       |-- acls
 108 |       |-- attrib
 109 |       |-- lun
 110 |       |   `-- lun_0
 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
 116 |       |-- np
 117 |       `-- param
 118 `-- version
 119
 120 target:/mnt/sdb/lio-core-2.6.git# lsmod
 121 Module                  Size  Used by
 122 tcm_nab5000             3935  4
 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
 130 libfc                  73681  0
 131 scsi_debug             56265  0
 132 scsi_tgt                8666  1 target_core_stgt
 133 configfs               20644  2 target_core_mod
 134
 135 ----------------------------------------------------------------------
 136
 137 Future TODO items:
 138
 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
 142            structure members.
 143
 144 October 5th, 2010
 145 Nicholas A. Bellinger <nab@linux-iscsi.org>