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

From: Simon Horman <[email-masked]>
Date: Wed, 26 Jun 2024 17:54:55 +0100

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.

> Reviewed-by: Stefano Brivio <[email-masked]>
> Signed-off-by: Aaron Conole <[email-masked]>

The above not withstanding,

Reviewed-by: Simon Horman <[email-masked]>

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 <[email-masked]>

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