netdev - Re: [PATCH v2 net-next 0/7] selftests: net: Switch pmtu.sh to use the internal ovs script.

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Date: Tue, 25 Jun 2024 17:41:49 +0200
From: Stefano Brivio <sbrivio@...hat.com>
To: Jakub Kicinski <kuba@...nel.org>
Cc: Aaron Conole <aconole@...hat.com>, Paolo Abeni <pabeni@...hat.com>,
 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>, Shuah Khan <shuah@...nel.org>,
 Adrián Moreno <amorenoz@...hat.com>, Simon Horman
 <horms@...nel.org>, David Ahern <dsahern@...il.com>
Subject: Re: [PATCH v2 net-next 0/7] selftests: net: Switch pmtu.sh to use
 the internal ovs script.

On Tue, 25 Jun 2024 07:06:54 -0700
Jakub Kicinski <kuba@...nel.org> wrote:

> On Tue, 25 Jun 2024 09:20:29 -0400 Aaron Conole wrote:
> > > I'm still wondering if the issue is Kconfig-related (plus possibly bad
> > > interaction with vng). I don't see the OVS knob enabled in the self-
> > > tests config. If it's implied by some other knob, and ends-up being
> > > selected as a module, vng could stumble upon loading the module at
> > > runtime, especially on incremental build (at least I experience that
> > > problem locally). I'm not even sure if the KCI is building
> > > incrementally or not, so all the above could is quite a wild guess.
> > >
> > > In any case I think adding the explicit CONFIG_OPENVSWITCH=y the
> > > selftest config would make the scenario more well defined.    
> > 
> > That is in 7/7 - but there was a collision with a netfilter knob getting
> > turned on.  I can repost it as-is (just after rebasing) if you think
> > that is the only issue.  
> 
> Sorry for not checking it earlier, looks like the runner was missing
> pyroute:
> 
> # python3 ./tools/testing/selftests/net/openvswitch/ovs-dpctl.py
> Need to install the python pyroute2 package >= 0.6.
> 
> I guess run_cmd counter-productively eats the stderr output ? :(

Yes, otherwise it's rather noisy, but you can run the thing with
VERBOSE=1, see also 56490b623aa0 ("selftests: Add debugging options to
pmtu.sh").

Before that change, we didn't eat standard error, but in the general
case I guess it's quite an improvement.

-- 
Stefano