From: Eduard Zingerman <eddyz87@gmail.com>
To: Andrii Nakryiko <andrii@kernel.org>,
bpf@vger.kernel.org, ast@kernel.org, daniel@iogearbox.net,
martin.lau@kernel.org
Cc: kernel-team@meta.com, Quentin Monnet <qmo@kernel.org>,
Mykyta Yatsenko <yatsenko@meta.com>
Subject: Re: [PATCH v2 bpf-next 1/3] bpftool: improve skeleton backwards compat with old buggy libbpfs
Date: Mon, 08 Jul 2024 15:16:05 -0700 [thread overview]
Message-ID: <27f9c0ab24f06c4215f75fe12e05b26c24e43071.camel@gmail.com> (raw)
In-Reply-To: <20240708204540.4188946-2-andrii@kernel.org>
On Mon, 2024-07-08 at 13:45 -0700, Andrii Nakryiko wrote:
> Old versions of libbpf don't handle varying sizes of bpf_map_skeleton
> struct correctly. As such, BPF skeleton generated by newest bpftool
> might not be compatible with older libbpf (though only when libbpf is
> used as a shared library), even though it, by design, should.
>
> Going forward libbpf will be fixed, plus we'll release bug fixed
> versions of relevant old libbpfs, but meanwhile try to mitigate from
> bpftool side by conservatively assuming older and smaller definition of
> bpf_map_skeleton, if possible. Meaning, if there are no struct_ops maps.
>
> If there are struct_ops, then presumably user would like to have
> auto-attaching logic and struct_ops map link placeholders, so use the
> full bpf_map_skeleton definition in that case.
>
> Acked-by: Quentin Monnet <qmo@kernel.org>
> Co-developed-by: Mykyta Yatsenko <yatsenko@meta.com>
> Signed-off-by: Mykyta Yatsenko <yatsenko@meta.com>
> Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
> ---
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
next prev parent reply other threads:[~2024-07-08 22:16 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-07-08 20:45 [PATCH v2 bpf-next 0/3] Fix libbpf BPF skeleton forward/backward compat Andrii Nakryiko
2024-07-08 20:45 ` [PATCH v2 bpf-next 1/3] bpftool: improve skeleton backwards compat with old buggy libbpfs Andrii Nakryiko
2024-07-08 22:16 ` Eduard Zingerman [this message]
2024-07-08 22:54 ` Eduard Zingerman
2024-07-08 23:20 ` Andrii Nakryiko
2024-07-08 20:45 ` [PATCH v2 bpf-next 2/3] libbpf: fix BPF skeleton forward/backward compat handling Andrii Nakryiko
2024-07-08 20:45 ` [PATCH v2 bpf-next 3/3] libbpf: improve old BPF skeleton handling for map auto-attach Andrii Nakryiko
2024-07-08 23:09 ` Eduard Zingerman
2024-07-10 2:10 ` [PATCH v2 bpf-next 0/3] Fix libbpf BPF skeleton forward/backward compat patchwork-bot+netdevbpf
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