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Date:   Wed, 28 Oct 2020 14:17:06 -0700
From:   Alexei Starovoitov <>
To:     Hangbin Liu <>
Cc:     Stephen Hemminger <>,
        Daniel Borkmann <>,
        David Ahern <>,
        Alexei Starovoitov <>,
        Martin KaFai Lau <>,
        Song Liu <>, Yonghong Song <>,
        David Miller <>,
        Jesper Dangaard Brouer <>,,,
        Jiri Benc <>,
        Andrii Nakryiko <>,
        Toke Høiland-Jørgensen <>
Subject: Re: [PATCHv2 iproute2-next 0/5] iproute2: add libbpf support

On Wed, Oct 28, 2020 at 09:25:24PM +0800, Hangbin Liu 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).

Awesome to see this work continue! Thank you.

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