netdev - Re: [ovs-dev] selftests: openvswitch: Questions about possible enhancements

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Message-ID: <f7th6fqaar1.fsf@redhat.com>
Date: Wed, 24 Apr 2024 14:14:42 -0400
From: Aaron Conole <aconole@...hat.com>
To: Benjamin Poirier <benjamin.poirier@...il.com>
Cc: Simon Horman <horms@...nel.org>,  Jakub Kicinski <kuba@...nel.org>,
  dev@...nvswitch.org,  netdev@...r.kernel.org,
  linux-kselftest@...r.kernel.org,  Jiri Pirko <jiri@...nulli.us>
Subject: Re: [ovs-dev] selftests: openvswitch: Questions about possible
 enhancements

Benjamin Poirier <benjamin.poirier@...il.com> writes:

> On 2024-04-24 18:37 +0100, Simon Horman wrote:
>> On Wed, Apr 24, 2024 at 05:44:05PM +0100, Simon Horman wrote:
>> > Hi Aaron, Jakub, all,
>> > 
>> > I have recently been exercising the Open vSwitch kernel selftests,
>> > using vng, something like this:
>> > 
>> > 	TESTDIR="tools/testing/selftests/net/openvswitch"
>> > 
>> >         vng -v --run . --user root --cpus 2 \
>> >                 --overlay-rwdir "$PWD" -- \
>> >                 "modprobe openvswitch && \
>> > 		 echo \"timeout=90\" >> \"${TESTDIR}/settings\" && \
>> >                  make -C \"$TESTDIR\" run_tests"
>> > 
>> > And I have some observations that I'd like to ask about.
>> > 
>> > 1. Building the kernel using the following command does not
>> >    build the openvswitch kernel module.
>> > 
>> > 	vng -v --build \
>> > 		--config tools/testing/selftests/net/config
>> > 
>> >    All that seems to be missing is CONFIG_OPENVSWITCH=m
>> >    and I am wondering what the best way of resolving this is.
>> > 
>> >    Perhaps I am doing something wrong.
>> >    Or perhaps tools/testing/selftests/net/openvswitch/config
>> >    should be created? If so, should it include (most of?) what is in
>> >    tools/testing/selftests/net/config, or just CONFIG_OPENVSWITCH=m?
>
> I noticed something similar when testing Jiri's virtio_net selftests
> patchset [1].
>
> drivers/net/virtio_net/config includes virtio options but the
> test also needs at least CONFIG_NET_VRF=y which is part of net/config.
>
> Whatever the answer to your question, all config files should be
> coherent on this matter.
>
> [1] https://lore.kernel.org/netdev/20240424104049.3935572-1-jiri@resnulli.us/
>
> [...]
>> 
>>   5. openvswitch.sh starts with "#!/bin/sh".
>>      But substitutions such as "${ns:0:1}0"  fail if /bin/sh is dash.
>>      Perhaps we should change openvswitch.sh to use bash?
>
> I think so. A similar change was done in
> c2518da8e6b0 selftests: bonding: Change script interpreter (v6.8-rc1)

+1 - I'm okay with it.