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Date:   Mon, 5 Mar 2018 10:39:14 +0800
From:   Jason Wang <>
To:     Jesper Dangaard Brouer <>
Subject: Re: [PATCH net V2] virtio-net: re enable XDP_REDIRECT for mergeable

On 2018年03月03日 00:07, Jesper Dangaard Brouer wrote:
> On Fri,  2 Mar 2018 17:29:14 +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. So this patch fixes this
>> by reserving enough tailroom and using fixed size of rx buffer.
>> Signed-off-by: Jason Wang <>
>> ---
>> Changes from V1:
>> - do not add duplicated tracepoint when redirection fails
> Acked-by: Jesper Dangaard Brouer <>
> 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 ;-)).

Thanks for the testing and reviewing.

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