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

[Alexei Starovoitov <alexei.starovoitov@xxxxxxxxx>]

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

The feature looks fine, but it needs a selftest.