linux-kernel - Re: [PATCH 3/3] tools bpftool: Display license GPL compatible in prog show/list

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Date:   Thu, 26 Apr 2018 09:53:26 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Jakub Kicinski <kubakici@...pl>, Jiri Olsa <jolsa@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org,
        Quentin Monnet <quentin.monnet@...ronome.com>
Subject: Re: [PATCH 3/3] tools bpftool: Display license GPL compatible in prog
 show/list

On 04/26/2018 09:39 AM, Jiri Olsa wrote:
> On Wed, Apr 25, 2018 at 11:14:30PM +0200, Daniel Borkmann wrote:
>> On 04/25/2018 11:03 PM, Jakub Kicinski wrote:
>>> On Wed, 25 Apr 2018 19:41:08 +0200, Jiri Olsa wrote:
>>>> @@ -295,6 +297,7 @@ static void print_prog_plain(struct bpf_prog_info *info, int fd)
>>>>  	printf("tag ");
>>>>  	fprint_hex(stdout, info->tag, BPF_TAG_SIZE, "");
>>>>  	print_dev_plain(info->ifindex, info->netns_dev, info->netns_ino);
>>>> +	printf(" license GPL %scompatible", info->gpl_compatible ? "" : "NON ");
>>>
>>> 3 nit picks:
>>>
>>> Other "fields" are separated by two spaces between each other:
>>>
>>>   4: kprobe  name func_begin  tag 57cd311f2e27366b license GPL compatible
>>>            ^^               ^^                    X
>>>           loaded_at Apr 25/11:20  uid 0
>>>                                 ^^
>>>           xlated 16B  not jited  memlock 4096B
>>>                     ^^         ^^
>>>
>>> Could you also update the example outputs in the man page:
>>>
>>> tools/bpf/bpftool/Documentation/bpftool-prog.rst
>>>
>>> Sorry about the bike shedding but I would also vote for:
>>>
>>> "[not] GPL compatible"
>>>
>>> rather than
>>>
>>> "license GPL [NON] compatible"
>>>
>>> for brevity..
>>
>> While we're at it, can we also squeeze this whole thing a bit? Feels like
>> huge string wasted for very little information compared to the rest of the
>> dump. Just append the string "gpl" at the end of the line if info->gpl_compatible
>> is set, otherwise just add nothing. This also allows to naturally grep
>> for it e.g. `bpftool p | grep gpl` if you need a quick summary.
> 
> that's fine with me.. so 'gpl' in here:
> 
> 5: tracepoint  name func  tag 57cd311f2e27366b  gpl
>         loaded_at Apr 26/09:37  uid 0
>         xlated 16B  not jited  memlock 4096B
> 
> and keeping tyhe whole name in json output:
> 
> [{
>         "id": 5,
>         "type": "tracepoint",
>         "name": "func",
>         "tag": "57cd311f2e27366b",
>         "gpl_compatible": true,
>         "loaded_at": "Apr 26/09:37",
>         "uid": 0,
>         "bytes_xlated": 16,
>         "jited": false,
>         "bytes_memlock": 4096
>     }
> ]
> 
> how about that?

Sounds good, thanks Jiri!