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

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Date:   Fri, 18 May 2018 14:48:04 +0100
From:   Quentin Monnet <quentin.monnet@...ronome.com>
To:     Sean Young <sean@...s.org>
Cc:     Y Song <ys114321@...il.com>, 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

2018-05-18 14:33 UTC+0100 ~ Sean Young <sean@...s.org>
> On Fri, May 18, 2018 at 11:13:07AM +0100, Quentin Monnet wrote:
>> 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).
> 
> So if CONFIG_BPF_RAWIR_EVENT is not set, then bpf-rawir-event.c is not
> compiled. Stubs are created in include/linux/bpf_rcdev.h, so this is
> already the case if I understand your correctly.

This is correct, sorry for the mistake.

>> (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.)
> 
> Ok, I'll add that.
Thanks a lot!

Quentin