TCM v4 fabric 模块脚本生成器¶

大家好，

本文档旨在成为一个迷你 HOWTO，用于使用 tcm_mod_builder.py 脚本生成一个全新的功能性 TCM v4 fabric .ko 模块，一旦构建完成，可以通过简单地使用以下命令立即加载以开始访问新的 TCM/ConfigFS fabric 框架：

modprobe $TCM_NEW_MOD
mkdir -p /sys/kernel/config/target/$TCM_NEW_MOD

该脚本将创建一个新的 drivers/target/$TCM_NEW_MOD/，并将执行以下操作：

为 drivers/target/target_core_fabric_configs.c 逻辑生成新的 API 调用者 ->make_tpg(), ->drop_tpg(), ->make_wwn(), ->drop_wwn()。这些在 $TCM_NEW_MOD/$TCM_NEW_MOD_configfs.c 中创建。

为加载/卸载 LKM 和 TCM/ConfigFS fabric 模块生成基本基础设施，使用一个骨架 struct target_core_fabric_ops API 模板。

基于用户为正在构建的新 fabric 模块定义的 T10 Proto_Ident，SPC-3 持久预留的 TransportID / Initiator 和 Target WWPN 相关处理程序将在 $TCM_NEW_MOD/$TCM_NEW_MOD_fabric.c 中自动生成，使用 drivers/target/target_core_fabric_lib.c 逻辑。

用于所有其他 Data I/O 路径和 fabric 相关属性逻辑的 NOP API 调用位于 $TCM_NEW_MOD/$TCM_NEW_MOD_fabric.c 中。

tcm_mod_builder.py 依赖于强制性的 '-p $PROTO_IDENT' 和 '-m $FABRIC_MOD_name' 参数，实际运行脚本如下所示：

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

在 tcm_mod_builder.py 的末尾，脚本将要求将以下行添加到 drivers/target/Kbuild 中：

obj-$(CONFIG_TCM_NAB5000)       += tcm_nab5000/

以及 drivers/target/Kconfig 中：

source "drivers/target/tcm_nab5000/Kconfig"

运行“make menuconfig”并选择新的 CONFIG_TCM_NAB5000 项
```
<M>   TCM_NAB5000 fabric module
```

使用“make modules”进行构建，完成后您将拥有：

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

加载新模块，创建一个 lun_0 configfs 组，并将新的 TCM Core IBLOCK 后备存储符号链接添加到端口

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

未来 TODO 项目¶

添加更多 T10 proto_idents

使 tcm_mod_dump_fabric_ops() 更智能，并直接从 include/target/target_core_fabric_ops.h:struct target_core_fabric_ops 结构成员生成函数指针定义。

2010 年 10 月 5 日

Nicholas A. Bellinger <nab@linux-iscsi.org>

Linux 内核

目录

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TCM v4 fabric 模块脚本生成器¶

未来 TODO 项目¶