netdev - Re: [PATCH iproute2-next 3/5] lib: add libbpf support

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Message-ID: <87eelm5ofg.fsf@toke.dk>
Date:   Sun, 25 Oct 2020 16:13:23 +0100
From:   Toke Høiland-Jørgensen <toke@...hat.com>
To:     David Ahern <dsahern@...il.com>, Hangbin Liu <haliu@...hat.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>
Cc:     Martin KaFai Lau <kafai@...com>, Song Liu <songliubraving@...com>,
        Yonghong Song <yhs@...com>, David Miller <davem@...emloft.net>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        netdev@...r.kernel.org, bpf@...r.kernel.org,
        Jiri Benc <jbenc@...hat.com>,
        Andrii Nakryiko <andrii@...nel.org>
Subject: Re: [PATCH iproute2-next 3/5] lib: add libbpf support

David Ahern <dsahern@...il.com> writes:

> On 10/22/20 9:38 PM, Hangbin Liu wrote:
>> Note: ip/ipvrf.c is not convert to use libbpf as it only encodes a few
>> instructions and load directly.
>
> for completeness, libbpf should be able to load a program from a buffer
> as well.

It can, but the particular use in ipvrf is just loading half a dozen
instructions defined inline in C - there's no object files, BTF or
anything. So why bother with going through libbpf in this case? The
actual attachment is using the existing code anyway...

-Toke