Re: [PATCH bpf-next] bpf: allow CGROUP_SKB programs to use bpf_skb_cgroup_id() helper

[Martin Lau]

On Thu, Jun 06, 2019 at 01:30:12PM -0700, Roman Gushchin wrote:
> Currently bpf_skb_cgroup_id() is not supported for CGROUP_SKB
> programs. An attempt to load such a program generates an error
> like this:
> 
>     libbpf:
>     0: (b7) r6 = 0
>     ...
>     9: (85) call bpf_skb_cgroup_id#79
>     unknown func bpf_skb_cgroup_id#79
> 
> There are no particular reasons for denying it, and we have some
> use cases where it might be useful.
> 
> So let's add it to the list of allowed helpers.
Acked-by: Martin KaFai Lau <kafai@xxxxxx>