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

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Date:   Thu, 16 Jun 2022 22:58:06 -0700
From:   Martin KaFai Lau <kafai@...com>
To:     Stanislav Fomichev <sdf@...gle.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 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.