netdev - Re: xdp and fragments with virtio

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Message-ID: <5ed42a82-56f6-d8ea-57b8-8f2229857dd1@gmail.com>
Date:   Fri, 18 May 2018 10:42:51 -0600
From:   David Ahern <dsahern@...il.com>
To:     Jason Wang <jasowang@...hat.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: xdp and fragments with virtio

On 5/17/18 3:24 AM, Jason Wang wrote:
> It looks like we wrongly drop packets after linearizing the packets
> during XDP_REDIRECT.
> 
> Please try the patch (but I do spot some other issues, will post a series):
> 
> Thanks
> 
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index f34794a..59702f9 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -800,7 +800,7 @@ static struct sk_buff *receive_mergeable(struct
> net_device *dev,
>                         }
>                         *xdp_xmit = true;
>                         if (unlikely(xdp_page != page))
> -                               goto err_xdp;
> +                               put_page(page);
>                         rcu_read_unlock();
>                         goto xdp_xmit;
>                 default:

Yes, that does solve the problem of fragments getting lost.