netdev - RE: [PATCH v2 bpf-next 2/3] libbpf: Add support for program extensions

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Message-ID: <5e27452af3157_74b42ad14ee465c075@john-XPS-13-9370.notmuch>
Date:   Tue, 21 Jan 2020 10:38:34 -0800
From:   John Fastabend <john.fastabend@...il.com>
To:     Alexei Starovoitov <ast@...nel.org>, davem@...emloft.net
Cc:     daniel@...earbox.net, netdev@...r.kernel.org, bpf@...r.kernel.org,
        kernel-team@...com
Subject: RE: [PATCH v2 bpf-next 2/3] libbpf: Add support for program
 extensions

Alexei Starovoitov wrote:
> Add minimal support for program extensions. bpf_object_open_opts() needs to be
> called with attach_prog_fd = target_prog_fd and BPF program extension needs to
> have in .c file section definition like SEC("freplace/func_to_be_replaced").
> libbpf will search for "func_to_be_replaced" in the target_prog_fd's BTF and
> will pass it in attach_btf_id to the kernel. This approach works for tests, but
> more compex use case may need to request function name (and attach_btf_id that
> kernel sees) to be more dynamic. Such API will be added in future patches.
> 
> Signed-off-by: Alexei Starovoitov <ast@...nel.org>
> ---

Acked-by: John Fastabend <john.fastabend@...il.com>