| ========================================= |
| 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 |
| |
| 1) 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 |
| 2) Generate basic infrastructure for loading/unloading LKMs and TCM/ConfigFS fabric module |
| using a skeleton struct target_core_fabric_ops API template. |
| 3) 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. |
| 4) 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 |
| ================= |
| |
| 1) Add more T10 proto_idents |
| 2) 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> |
