netdev - Re: [PATCH bpf-next v4] libbpf: Show supported ELF section names on when failed to guess a prog/attach type

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Date:   Mon, 21 Jan 2019 09:42:02 -0800
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Taeung Song <treeze.taeung@...il.com>
Cc:     Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>, netdev@...r.kernel.org,
        Quentin Monnet <quentin.monnet@...ronome.com>,
        Andrey Ignatov <rdna@...com>
Subject: Re: [PATCH bpf-next v4] libbpf: Show supported ELF section names on
 when failed to guess a prog/attach type

On Mon, 21 Jan 2019 22:06:38 +0900, Taeung Song wrote:
> We need to let users check their wrong ELF section name
> with proper ELF section names when failed to get a prog/attach type from it.
> Because users can't realize libbpf guess prog/attach types from
> given ELF section names.
> For example, when a 'cgroup' section name of a BPF program is used,
> show available ELF section names(types).
> 
> Before:
> 
>     $ bpftool prog load bpf-prog.o /sys/fs/bpf/prog1
>     Error: failed to guess program type based on ELF section name cgroup
> 
> After:
> 
>     libbpf: failed to guess program type based on ELF section name 'cgroup'
>     libbpf: supported section(type) names are: socket kprobe/ kretprobe/ classifier action tracepoint/ raw_tracepoint/ xdp perf_event lwt_in lwt_out lwt_xmit lwt_seg6local cgroup_skb/ingress cgroup_skb/egress cgroup/skb cgroup/sock cgroup/post_bind4 cgroup/post_bind6 cgroup/dev sockops sk_skb/stream_parser sk_skb/stream_verdict sk_skb sk_msg lirc_mode2 flow_dissector cgroup/bind4 cgroup/bind6 cgroup/connect4 cgroup/connect6 cgroup/sendmsg4 cgroup/sendmsg6
> 
> Cc: Quentin Monnet <quentin.monnet@...ronome.com>
> Cc: Jakub Kicinski <jakub.kicinski@...ronome.com>
> Cc: Andrey Ignatov <rdna@...com>
> Signed-off-by: Taeung Song <treeze.taeung@...il.com>

Acked-by: Jakub Kicinski <jakub.kicinski@...ronome.com>