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

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Date:   Thu, 11 Apr 2019 15:37:13 +0000
From:   Yonghong Song <yhs@...com>
To:     Daniel Borkmann <daniel@...earbox.net>,
        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 Lau <kafai@...com>, Song Liu <songliubraving@...com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Andrii Nakryiko <andriin@...com>
Subject: Re: [PATCH bpf-next] tools/bpftool: show btf id in program
 information


cc Andrii

On 4/11/19 12:51 AM, Daniel Borkmann wrote:
> 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?

Agreed. It does make sense to print the detailed info for a btf id
through bpftool.

Andrii had a btf dumper to dump types as well as BTF elf file .btf.ext
contents in his private branch. Maybe Andrii can comment further
on this subject.