netdev - Re: [PATCHv3 iproute2-next 0/5] iproute2: add libbpf support

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Message-ID: <CAADnVQKu7usDXbwwcjKChcs0NU3oP0deBsGGEavR_RuPkht74g@mail.gmail.com>
Date:   Wed, 4 Nov 2020 14:10:25 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Edward Cree <ecree@...arflare.com>
Cc:     Hangbin Liu <haliu@...hat.com>, David Ahern <dsahern@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        David Miller <davem@...emloft.net>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Jiri Benc <jbenc@...hat.com>,
        Andrii Nakryiko <andrii@...nel.org>,
        Toke Høiland-Jørgensen <toke@...hat.com>
Subject: Re: [PATCHv3 iproute2-next 0/5] iproute2: add libbpf support

On Wed, Nov 4, 2020 at 1:16 PM Edward Cree <ecree@...arflare.com> wrote:
>
> On 04/11/2020 03:11, Alexei Starovoitov wrote:
> > The user will do 'tc -V'. Does version mean anything from bpf loading pov?
> > It's not. The user will do "ldd `which tc`" and then what?
> Is it beyond the wit of man for 'tc -V' to output somethingabout
>  libbpf version?
> Other libraries seem to solve these problems all the time, I
>  haven't seen anyone explain what makes libbpf so special that it
>  has to be different.

slow vger? Please see Daniel and Andrii detailed explanations.

libbpf is not your traditional library.
Looking through the installed libraries on my devserver in /lib64/ directory
I think the closest is libbfd.so
Then think why gdb always statically links it.