netdev - Re: [PATCH bpf-next v3 1/3] bpftool: Add bpf

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Message-ID: <393b7e0e-2240-49c5-9ff7-8efa07a11d3b@linux.dev>
Date: Wed, 23 Jul 2025 18:55:07 +0800
From: Tao Chen <chen.dylane@...ux.dev>
To: Quentin Monnet <qmo@...nel.org>, ast@...nel.org, daniel@...earbox.net,
 andrii@...nel.org, martin.lau@...ux.dev, eddyz87@...il.com, song@...nel.org,
 yonghong.song@...ux.dev, john.fastabend@...il.com, kpsingh@...nel.org,
 sdf@...ichev.me, haoluo@...gle.com, jolsa@...nel.org, davem@...emloft.net,
 kuba@...nel.org, hawk@...nel.org
Cc: linux-kernel@...r.kernel.org, bpf@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH bpf-next v3 1/3] bpftool: Add bpf_token show

在 2025/7/23 18:40, Quentin Monnet 写道:
> 2025-07-23 11:31 UTC+0800 ~ Tao Chen <chen.dylane@...ux.dev>
>> Add `bpftool token show` command to get token info
>> from bpffs in /proc/mounts.
>>
>> Example plain output for `token show`:
>> token_info  /sys/fs/bpf/token
>> 	allowed_cmds:
>> 	  map_create          prog_load
>> 	allowed_maps:
>> 	allowed_progs:
>> 	  kprobe
>> 	allowed_attachs:
>> 	  xdp
>> token_info  /sys/fs/bpf/token2
>> 	allowed_cmds:
>> 	  map_create          prog_load
>> 	allowed_maps:
>> 	allowed_progs:
>> 	  kprobe
>> 	allowed_attachs:
>> 	  xdp
>>
>> Example json output for `token show`:
>> [{
>> 	"token_info": "/sys/fs/bpf/token",
>> 	"allowed_cmds": ["map_create", "prog_load"],
>> 	"allowed_maps": [],
>> 	"allowed_progs": ["kprobe"],
>> 	"allowed_attachs": ["xdp"]
>> }, {
>> 	"token_info": "/sys/fs/bpf/token2",
>> 	"allowed_cmds": ["map_create", "prog_load"],
>> 	"allowed_maps": [],
>> 	"allowed_progs": ["kprobe"],
>> 	"allowed_attachs": ["xdp"]
>> }]
>>
>> Signed-off-by: Tao Chen <chen.dylane@...ux.dev>
>> ---
> 
> [...]
> 
>> diff --git a/tools/bpf/bpftool/token.c b/tools/bpf/bpftool/token.c
>> new file mode 100644
>> index 00000000000..06b56ea40b8
>> --- /dev/null
>> +++ b/tools/bpf/bpftool/token.c
> 
> [...]
> 
>> +static int do_help(int argc, char **argv)
>> +{
>> +	if (json_output) {
>> +		jsonw_null(json_wtr);
>> +		return 0;
>> +	}
>> +
>> +	fprintf(stderr,
>> +		"Usage: %1$s %2$s { show | list }\n"
>> +		"	%1$s %2$s help\n"
> 
> 
> One more nit: applying and testing the help message locally, I noticed
> that the alignement is not correct:
> 
>      $ ./bpftool token help
>      Usage: bpftool token { show | list }
>              bpftool token help
> 
> The two "bpftool" should be aligned. This is because you use a tab for
> indent on the "help" line. Can you please replace it with spaces to fix
> indentation, and remain consistent with what other files do?
> 

Thanks for your testing, i will fix it, thanks again.

> After that change, you can add:
> 
>      Reviewed-by: Quentin Monnet <qmo@...nel.org>


-- 
Best Regards
Tao Chen