netdev - Re: [PATCH bpf-next] tools/bpftool: show btf id in program information

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Date:   Thu, 11 Apr 2019 09:51:47 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Prashant Bhole <bhole_prashant_q7@....ntt.co.jp>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Quentin Monnet <quentin.monnet@...ronome.com>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        netdev@...r.kernel.org
Subject: Re: [PATCH bpf-next] tools/bpftool: show btf id in program
 information

On 04/10/2019 05:39 PM, Jakub Kicinski wrote:
> On Wed, 10 Apr 2019 13:56:42 +0900, Prashant Bhole wrote:
>> Let's add a way to know whether a program has btf context.
>> Patch adds 'btf_id' in the output of program listing.
>> When btf_id is present, it means program has btf context.
>>
>> Sample output:
>> user@...t# bpftool prog list
>> 25: xdp  name xdp_prog1  tag 539ec6ce11b52f98  gpl
>> 	loaded_at 2019-04-10T11:44:20+0900  uid 0
>> 	xlated 488B  not jited  memlock 4096B  map_ids 23
>> 	btf_id 1
>>
>> Signed-off-by: Prashant Bhole <bhole_prashant_q7@....ntt.co.jp>
> 
> Acked-by: Jakub Kicinski <jakub.kicinski@...ronome.com>

Applied, thanks!

What would be the plan for the maps listing?

I think what we could also potentially have is some way to dump
the BTF type info based on such above id. Perhaps it would make
sense to similarly share the verifier's printer with bpftool?