linux-kernel - Re: [PATCH net-next v3 6/7] selftests: net: Use the provided dpctl rather than the vswitchd for tests.

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Message-ID: <f7t1q4izefy.fsf@redhat.com>
Date: Thu, 27 Jun 2024 09:46:09 -0400
From: Aaron Conole <aconole@...hat.com>
To: Simon Horman <horms@...nel.org>
Cc: netdev@...r.kernel.org,  dev@...nvswitch.org,
  linux-kselftest@...r.kernel.org,  linux-kernel@...r.kernel.org,  Pravin B
 Shelar <pshelar@....org>,  "David S. Miller" <davem@...emloft.net>,  Eric
 Dumazet <edumazet@...gle.com>,  Jakub Kicinski <kuba@...nel.org>,  Paolo
 Abeni <pabeni@...hat.com>,  Shuah Khan <shuah@...nel.org>,  Stefano Brivio
 <sbrivio@...hat.com>,  Adrián Moreno <amorenoz@...hat.com>
Subject: Re: [PATCH net-next v3 6/7] selftests: net: Use the provided dpctl
 rather than the vswitchd for tests.

Simon Horman <horms@...nel.org> writes:

> On Tue, Jun 25, 2024 at 01:22:44PM -0400, Aaron Conole wrote:
>> The current pmtu test infrastucture requires an installed copy of the
>> ovs-vswitchd userspace.  This means that any automated or constrained
>> environments may not have the requisite tools to run the tests.  However,
>> the pmtu tests don't require any special classifier processing.  Indeed
>> they are only using the vswitchd in the most basic mode - as a NORMAL
>> switch.
>> 
>> However, the ovs-dpctl kernel utility can now program all the needed basic
>> flows to allow traffic to traverse the tunnels and provide support for at
>> least testing some basic pmtu scenarios.  More complicated flow pipelines
>> can be added to the internal ovs test infrastructure, but that is work for
>> the future.  For now, enable the most common cases - wide mega flows with
>> no other prerequisites.
>> 
>> Enhance the pmtu testing to try testing using the internal utility, first.
>> As a fallback, if the internal utility isn't running, then try with the
>> ovs-vswitchd userspace tools.
>> 
>> Additionally, make sure that when the pyroute2 package is not available
>> the ovs-dpctl utility will error out to properly signal an error has
>> occurred and skip using the internal utility.
>
> Hi Aaron,
>
> I don't feel strongly about this, but it does feel like the
> change to ovs-dpctl.py could live in a separate patch.

I can do it if others feel like it should be a separate change.  I
debated it as a separate patch, but I felt that it wasn't really a bug
fix, more like a behavior change that would be associated with this pmtu
script.  I didn't (at the time, and still don't) see a reason to
separately backport them, but it could also be considered as a separate
orthogonal change, and I'm okay with it being a different patch.  Like
you, I don't feel strongly either way.

If I do separate it, I will also add your Reviewed and Tested tags to
that patch.

>> Reviewed-by: Stefano Brivio <sbrivio@...hat.com>
>> Signed-off-by: Aaron Conole <aconole@...hat.com>
>
> The above not withstanding,
>
>
> Reviewed-by: Simon Horman <horms@...nel.org>
>
> I have tested pmtu.sh with this change on Fedora 40 both
> with python3-pyroute2 installed, which uses ovs-dpctl,
> and without, which uses ovs-vswitchd userspace tools.
>
> Tested-by: Simon Horman <horms@...nel.org>

Thanks!

> ...