linux-kernel - Re: [PATCH net V2] virtio-net: re enable XDP

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Message-ID: <20180302170758.332600d6@redhat.com>
Date:   Fri, 2 Mar 2018 17:07:58 +0100
From:   Jesper Dangaard Brouer <brouer@...hat.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     mst@...hat.com, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        john.fastabend@...il.com, brouer@...hat.com
Subject: Re: [PATCH net V2] virtio-net: re enable XDP_REDIRECT for mergeable
 buffer

On Fri,  2 Mar 2018 17:29:14 +0800
Jason Wang <jasowang@...hat.com> wrote:

> XDP_REDIRECT support for mergeable buffer was removed since commit
> 7324f5399b06 ("virtio_net: disable XDP_REDIRECT in receive_mergeable()
> case"). This is because we don't reserve enough tailroom for struct
> skb_shared_info which breaks XDP assumption. So this patch fixes this
> by reserving enough tailroom and using fixed size of rx buffer.
> 
> Signed-off-by: Jason Wang <jasowang@...hat.com>
> ---
> Changes from V1:
> - do not add duplicated tracepoint when redirection fails

Acked-by: Jesper Dangaard Brouer <brouer@...hat.com>

I gave it a quick spin on my testlab, and cpumap seems to
work/not-crash now (if I managed to turn back config to
receive_mergeable() correctly ;-)).

-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Principal Kernel Engineer at Red Hat
  LinkedIn: http://www.linkedin.com/in/brouer