linux-kernel - Re: 'perf test BPF' failing, libbpf regression wrt "basic API for BPF obj name"

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Date:   Wed, 29 Nov 2017 13:07:34 -0800
From:   Martin KaFai Lau <kafai@...com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
CC:     Matthias Kaehlcke <mka@...omium.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Yonghong Song <yhs@...com>, Alexei Starovoitov <ast@...com>,
        "David S. Miller" <davem@...emloft.net>,
        Daniel Borkmann <daniel@...earbox.net>,
        Wang Nan <wangnan0@...wei.com>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        David Ahern <dsahern@...il.com>, Jiri Olsa <jolsa@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        "Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>
Subject: Re: 'perf test BPF' failing, libbpf regression wrt "basic API for
 BPF obj name"

On Tue, Nov 28, 2017 at 04:05:19PM -0300, Arnaldo Carvalho de Melo wrote:
> 
> [root@...et ~]# perf test -v bpf
> 39: BPF filter                                            :
> 39.1: Basic BPF filtering                                 :
> --- start ---
> test child forked, pid 12198
> Kernel build dir is set to /lib/modules/4.14.0+/build
> set env: KBUILD_DIR=/lib/modules/4.14.0+/build
[ ... ]
> libbpf: failed to create map (name: 'flip_table'): Invalid argument
> libbpf: failed to load object '[basic_bpf_test]'
> bpf: load objects failed
88cda1c9da02 ("bpf: libbpf: Provide basic API support to specify BPF obj name")
is introduced in 4.15.

I think the perf@...nel-4.15 broke on older kernels like 4.14 because
the new bpf prog/map name is only introduced since 4.15.

The newer perf needs to be compatible with an older kernel?