Re: [dpdk-dev] [PATCH v3] usertools/devbind: fix binding for built-in kernel drivers

["Burakov, Anatoly" <anatoly.burakov@intel.com>]

On 19-Nov-20 7:16 AM, Yongxin Liu wrote:
> A driver can be loaded as a dynamic module or a built-in module.
> In commit 681a67288655 ("usertools: check if module is loaded
> before binding"), script only checks modules in /sys/module/.
> 
> However, for built-in kernel driver, it only shows up in /sys/module/,
> if it has a version or at least one parameter. So add check for
> modules in /lib/modules/$(uname -r)/modules.builtin.
> 
> Thanks for Anatoly Burakov's advice.
> 
> Signed-off-by: Yongxin Liu <yongxin.liu@windriver.com>
> ---
> 
> v3:
>   - Add built-in module list in loaded_modules for checking
>     instead of removing error check.
> 
> v2:
>   - fix git commit description style in commit log
>   - fix typo spelling
> 
> ---
>   usertools/dpdk-devbind.py | 8 +++++++-
>   1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/usertools/dpdk-devbind.py b/usertools/dpdk-devbind.py
> index 99112b7ab..5b34ccd2a 100755
> --- a/usertools/dpdk-devbind.py
> +++ b/usertools/dpdk-devbind.py
> @@ -181,7 +181,13 @@ def module_is_loaded(module):
>   
>       loaded_modules = sysfs_mods
>   
> -    return module in sysfs_mods
> +    # add built-in modules as loaded
> +    builtin_mods = subprocess.check_output(["cat /lib/modules/$(uname -r)/modules.builtin"], shell=True).splitlines()

I'd rather not call shell directly, it's bad practice and is potentially 
unsafe. The $(uname -r) can be replaced with:

	import platform
	release = platform.uname().release  # equivalent to $(uname -r)

The rest can follow:

	filename = os.path.join("/lib/modules/", release, "modules.builtin")
	# read the file contents, split lines, etc.

Also, please check if file exists to ensure we don't crash the script.

> +    for mod in builtin_mods:
> +        mod_name = os.path.basename(mod.decode("utf8")).split(".ko", 1)

os.path.splitext(os.path.basename(...))?

> +        loaded_modules.append(mod_name[0])
> +
> +    return module in loaded_modules
>   
>   
>   def check_modules():
> 


-- 
Thanks,
Anatoly