TCM v4 fabric 模組指令碼生成器¶
大家好，
本文件旨在成為一個迷你 HOWTO，用於使用 tcm_mod_builder.py 指令碼生成一個全新的功能性 TCM v4 fabric .ko 模組，一旦構建完成，可以透過簡單地使用以下命令立即載入以開始訪問新的 TCM/ConfigFS fabric 框架：
modprobe $TCM_NEW_MOD
mkdir -p /sys/kernel/config/target/$TCM_NEW_MOD
該指令碼將建立一個新的 drivers/target/$TCM_NEW_MOD/，並將執行以下操作：
為 drivers/target/target_core_fabric_configs.c 邏輯生成新的 API 呼叫者 ->make_tpg(), ->drop_tpg(), ->make_wwn(), ->drop_wwn()。 這些在 $TCM_NEW_MOD/$TCM_NEW_MOD_configfs.c 中建立。
為載入/解除安裝 LKM 和 TCM/ConfigFS fabric 模組生成基本基礎設施，使用一個骨架 struct target_core_fabric_ops API 模板。
基於使用者為正在構建的新 fabric 模組定義的 T10 Proto_Ident，SPC-3 持久預留的 TransportID / Initiator 和 Target WWPN 相關處理程式將在 $TCM_NEW_MOD/$TCM_NEW_MOD_fabric.c 中自動生成，使用 drivers/target/target_core_fabric_lib.c 邏輯。
用於所有其他 Data I/O 路徑和 fabric 相關屬性邏輯的 NOP API 呼叫位於 $TCM_NEW_MOD/$TCM_NEW_MOD_fabric.c 中。
tcm_mod_builder.py 依賴於強制性的 '-p $PROTO_IDENT' 和 '-m $FABRIC_MOD_name' 引數，實際執行指令碼如下所示：
target:/mnt/sdb/lio-core-2.6.git/Documentation/target# python tcm_mod_builder.py -p iSCSI -m tcm_nab5000
tcm_dir: /mnt/sdb/lio-core-2.6.git/Documentation/target/../../
Set fabric_mod_name: tcm_nab5000
Set fabric_mod_dir:
/mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000
Using proto_ident: iSCSI
Creating fabric_mod_dir:
/mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000
Writing file:
/mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000/tcm_nab5000_base.h
Using tcm_mod_scan_fabric_ops:
/mnt/sdb/lio-core-2.6.git/Documentation/target/../../include/target/target_core_fabric_ops.h
Writing file:
/mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000/tcm_nab5000_fabric.c
Writing file:
/mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000/tcm_nab5000_fabric.h
Writing file:
/mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000/tcm_nab5000_configfs.c
Writing file:
/mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000/Kbuild
Writing file:
/mnt/sdb/lio-core-2.6.git/Documentation/target/../../drivers/target/tcm_nab5000/Kconfig
Would you like to add tcm_nab5000to drivers/target/Kbuild..? [yes,no]: yes
Would you like to add tcm_nab5000to drivers/target/Kconfig..? [yes,no]: yes
在 tcm_mod_builder.py 的末尾，指令碼將要求將以下行新增到 drivers/target/Kbuild 中：
obj-$(CONFIG_TCM_NAB5000) += tcm_nab5000/
以及 drivers/target/Kconfig 中：
source "drivers/target/tcm_nab5000/Kconfig"
執行“make menuconfig”並選擇新的 CONFIG_TCM_NAB5000 項
<M> TCM_NAB5000 fabric module
使用“make modules”進行構建，完成後您將擁有：
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
載入新模組，建立一個 lun_0 configfs 組，並將新的 TCM Core IBLOCK 後備儲存符號連結新增到埠
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
未來 TODO 專案¶
新增更多 T10 proto_idents
使 tcm_mod_dump_fabric_ops() 更智慧，並直接從 include/target/target_core_fabric_ops.h:struct target_core_fabric_ops 結構成員生成函式指標定義。
2010 年 10 月 5 日
Nicholas A. Bellinger <nab@linux-iscsi.org>