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

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Message-ID: <CAADnVQJV7mFLE7_vPH8wcZqDsLhuZGqLk9sbrxWOeELL4X=NVg@mail.gmail.com>
Date:   Fri, 22 Oct 2021 08:25:16 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Di Zhu <zhudi2@...wei.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Jakub Sitnicki <jakub@...udflare.com>,
        bpf <bpf@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] bpf: support BPF_PROG_QUERY for progs attached to sockmap

On Fri, Oct 22, 2021 at 3:34 AM Di Zhu <zhudi2@...wei.com> 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>

The feature looks fine, but it needs a selftest.