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

[zhudi (E)]

> 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@xxxxxxxxxx>
> > ---
> 
> 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.

 Thanks for your advice, I will add it in my patch.

> 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