linux-kernel - Re: [PATCH net-next 1/2] virtio-net: re enable XDP

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Message-ID: <8c57f936-8fea-e2b8-ef8e-1dda81e190a6@redhat.com>
Date:   Fri, 2 Mar 2018 12:20:50 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, brouer@...hat.com,
        john.fastabend@...il.com
Subject: Re: [PATCH net-next 1/2] virtio-net: re enable XDP_REDIRECT for
 mergeable buffer



On 2018年03月01日 21:36, Michael S. Tsirkin wrote:
> On Thu, Mar 01, 2018 at 11:19:04AM +0800, Jason Wang 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. Other complaints are, the
>> complex linearize logic and EWMA estimation may increase the
>> possibility of linearizing.
>>
>> Signed-off-by: Jason Wang<jasowang@...hat.com>
> How about reposting just this patch for net? It's pretty small
> and this way we don't have broken redirect there.
> Probably keeping the linearize in here to reduce the
> amount of changes.
>

Looks possible, let me post a version for net.

Thanks