netdev - Re: [PATCH net] selftests: fixes for UDP GRO

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Date:   Wed, 27 Feb 2019 10:26:04 +0100
From:   Paolo Abeni <pabeni@...hat.com>
To:     Willem de Bruijn <willemdebruijn.kernel@...il.com>
Cc:     Network Development <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Willem de Bruijn <willemb@...gle.com>
Subject: Re: [PATCH net] selftests: fixes for UDP GRO

Hi,

On Tue, 2019-02-26 at 13:38 -0500, Willem de Bruijn wrote:
> On Tue, Feb 26, 2019 at 9:28 AM Paolo Abeni <pabeni@...hat.com> wrote:
> > The current implementation for UDP GRO tests is racy: the receiver
> > may flush the RX queue while the sending is still transmitting and
> > incorrectly report RX errors, with a wrong number of packet received.
> > 
> > Add explicit timeouts to the receiver for both connection activation
> > (first packet received for UDP) and reception completion, so that
> > in the above critical scenario the receiver will wait for the
> > transfer completion.
> > 
> > Fixes: 3327a9c46352 ("selftests: add functionals test for UDP GRO")
> > Signed-off-by: Paolo Abeni <pabeni@...hat.com>
> 
> Acked-by: Willem de Bruijn <willemb@...gle.com>

Thanks for reviewing.

> ---
> 
> This is because of that "force termination after the second poll()"?

Yes, exactly.

> Could perhaps also just extend do_recv to wait while (!interrupted &&
> tnow < tstart + 2000) and avoid the explicit arguments.

I thought about that, but then UDP GRO self-tests would take a bit more
and the binary helper would be less re-usable for future test cases.

Cheers,

Paolo