linux-kernel - Re: [PATCH v3 2/2] bpf: add selftest for rawir

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Message-ID: <86ffb16c-9b4e-c826-ecd2-82266e7b8c2e@netronome.com>
Date:   Fri, 18 May 2018 11:13:07 +0100
From:   Quentin Monnet <quentin.monnet@...ronome.com>
To:     Sean Young <sean@...s.org>, Y Song <ys114321@...il.com>
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        Alexei Starovoitov <ast@...nel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        netdev <netdev@...r.kernel.org>,
        Matthias Reichl <hias@...us.com>,
        Devin Heitmueller <dheitmueller@...nellabs.com>
Subject: Re: [PATCH v3 2/2] bpf: add selftest for rawir_event type program

2018-05-17 22:01 UTC+0100 ~ Sean Young <sean@...s.org>
> On Thu, May 17, 2018 at 10:17:59AM -0700, Y Song wrote:
>> On Wed, May 16, 2018 at 2:04 PM, Sean Young <sean@...s.org> wrote:
>>> This is simple test over rc-loopback.
>>>
>>> Signed-off-by: Sean Young <sean@...s.org>
>>> ---
>>>  tools/bpf/bpftool/prog.c                      |   1 +
>>>  tools/include/uapi/linux/bpf.h                |  57 +++++++-
>>>  tools/lib/bpf/libbpf.c                        |   1 +
>>>  tools/testing/selftests/bpf/Makefile          |   8 +-
>>>  tools/testing/selftests/bpf/bpf_helpers.h     |   6 +
>>>  tools/testing/selftests/bpf/test_rawir.sh     |  37 +++++
>>>  .../selftests/bpf/test_rawir_event_kern.c     |  26 ++++
>>>  .../selftests/bpf/test_rawir_event_user.c     | 130 ++++++++++++++++++
>>>  8 files changed, 261 insertions(+), 5 deletions(-)
>>>  create mode 100755 tools/testing/selftests/bpf/test_rawir.sh
>>>  create mode 100644 tools/testing/selftests/bpf/test_rawir_event_kern.c
>>>  create mode 100644 tools/testing/selftests/bpf/test_rawir_event_user.c

[...]

>> Most people probably not really familiar with lircN device. It would be
>> good to provide more information about how to enable this, e.g.,
>>   CONFIG_RC_CORE=y
>>   CONFIG_BPF_RAWIR_EVENT=y
>>   CONFIG_RC_LOOPBACK=y
>>   ......
> 
> Good point. I'll add some words explaining what is and how to make it work.
> 
> Thanks
> Sean


By the way, shouldn't the two eBPF helpers bpf_rc_keydown() and
bpf_rc_repeat() be compiled out in patch 1 if e.g.
CONFIG_BPF_RAWIR_EVENT is not set? There are some other helpers that are
compiled only if relevant config options are set (bpf_get_xfrm_state()
for example).

(If you were to change that, please also update helper documentations to
indicate what configuration options are required to be able to use the
helpers.)

Best regards,
Quentin