netdev - Re: [PATCH bpf-next v9 09/10] bpftool: implement cgroup tree for BPF_LSM

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Date:   Fri, 17 Jun 2022 11:28:27 -0700
From:   Stanislav Fomichev <sdf@...gle.com>
To:     Martin KaFai Lau <kafai@...com>
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org, ast@...nel.org,
        daniel@...earbox.net, andrii@...nel.org
Subject: Re: [PATCH bpf-next v9 09/10] bpftool: implement cgroup tree for BPF_LSM_CGROUP

On Thu, Jun 16, 2022 at 10:58 PM Martin KaFai Lau <kafai@...com> wrote:
>
> On Fri, Jun 10, 2022 at 09:58:02AM -0700, Stanislav Fomichev wrote:
> > @@ -84,6 +87,19 @@ static int show_bpf_prog(int id, enum bpf_attach_type attach_type,
> >       }
> >
> >       attach_type_str = libbpf_bpf_attach_type_str(attach_type);
> > +
> > +     if (btf_vmlinux &&
> > +         info.attach_btf_id < btf__type_cnt(btf_vmlinux)) {
> > +             /* Note, we ignore info.attach_btf_obj_id for now. There
> > +              * is no good way to resolve btf_id to vmlinux
> > +              * or module btf.
> > +              */
> On usage could be using it to get the btf_info by bpf_obj_get_info_by_fd.
> Check for the kernel_btf == true and name is "vmlinux".
> To be future proof, it can print <unknown> func for anything
> other than "vmlinux" btf.

Thanks for the suggestion! I'll try to do it and cache btf_vmlinux_id
if it's "vmlinux". What we really need is a way to obtain vmlinux
btf_id and compare it against info.attach_btf_obj_id.