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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.
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