linux-kernel - RE: [PATCH] bpf: support BPF_PROG_QUERY for progs attached to sockmap

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Date:   Fri, 22 Oct 2021 08:46:47 -0700
From:   John Fastabend <john.fastabend@...il.com>
To:     Di Zhu <zhudi2@...wei.com>, davem@...emloft.net, ast@...nel.org,
        daniel@...earbox.net, andrii@...nel.org, kafai@...com,
        songliubraving@...com, yhs@...com, john.fastabend@...il.com,
        kpsingh@...nel.org, jakub@...udflare.com
Cc:     bpf@...r.kernel.org, linux-kernel@...r.kernel.org,
        zhudi2@...wei.com
Subject: RE: [PATCH] bpf: support BPF_PROG_QUERY for progs attached to sockmap

Di Zhu wrote:
> Right now there is no way to query whether BPF programs are
> attached to a sockmap or not.
> 
> we can use the standard interface in libbpf to query, such as:
> bpf_prog_query(mapFd, BPF_SK_SKB_STREAM_PARSER, 0, NULL, ...);
> the mapFd is the fd of sockmap.
> 
> Signed-off-by: Di Zhu <zhudi2@...wei.com>
> ---

LGTM, lets add a small test here as well

  ./tools/testing/selftests/bpf/prog_tests/sockmap_basic.c

Looks like we can just copy the sk_lookup.c test case which does
the query tests for BPF_SK_LOOKUP.

Also I don't think its required for this series, but a bpftool
patch to query it would be useful as well if its doesn't just
work with above.

Thanks!
John