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

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Date:   Thu, 26 Apr 2018 09:39:05 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Daniel Borkmann <daniel@...earbox.net>
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 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?

thanks,
jirka