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

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Date:   Sun, 29 Nov 2020 09:33:03 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     Hangbin Liu <haliu@...hat.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        David Ahern <dsahern@...il.com>,
        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>,
        Network Development <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: [PATCH iproute2-next 0/5] iproute2: add libbpf support

On Sat, Nov 28, 2020 at 10:16 PM Stephen Hemminger
<stephen@...workplumber.org> wrote:
>
> On Fri, 23 Oct 2020 11:38:50 +0800
> Hangbin Liu <haliu@...hat.com> wrote:
>
> > This series converts iproute2 to use libbpf for loading and attaching
> > BPF programs when it is available. This means that iproute2 will
> > correctly process BTF information and support the new-style BTF-defined
> > maps, while keeping compatibility with the old internal map definition
> > syntax.
> >
> > This is achieved by checking for libbpf at './configure' time, and using
> > it if available. By default the system libbpf will be used, but static
> > linking against a custom libbpf version can be achieved by passing
> > LIBBPF_DIR to configure. FORCE_LIBBPF can be set to force configure to
> > abort if no suitable libbpf is found (useful for automatic packaging
> > that wants to enforce the dependency).
> >
> > The old iproute2 bpf code is kept and will be used if no suitable libbpf
> > is available. When using libbpf, wrapper code ensures that iproute2 will
> > still understand the old map definition format, including populating
> > map-in-map and tail call maps before load.
> >
> > The examples in bpf/examples are kept, and a separate set of examples
> > are added with BTF-based map definitions for those examples where this
> > is possible (libbpf doesn't currently support declaratively populating
> > tail call maps).
>
>
> Luca wants to put this in Debian 11 (good idea), but that means:
>
> 1. It has to work with 5.10 release and kernel.
> 2. Someone has to test it.
> 3. The 5.10 is a LTS kernel release which means BPF developers have
>    to agree to supporting LTS releases.

That must be a bad joke.
You did the opposite of what we asked.
You folks are on your own.
5.10, 5.11 whatever release. When angry users come with questions
about random behavior you'll be answering them. Not us.