netdev - Re: [PATCH net 1/4] virtio-net: correctly redirect linearized packet

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Date:   Mon, 21 May 2018 18:03:38 +0300
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net 1/4] virtio-net: correctly redirect linearized packet

On Mon, May 21, 2018 at 04:35:03PM +0800, Jason Wang wrote:
> After a linearized packet was redirected by XDP, we should not go for
> the err path which will try to pop buffers for the next packet and
> increase the drop counter. Fixing this by just drop the page refcnt
> for the original page.
> 
> Fixes: 186b3c998c50 ("virtio-net: support XDP_REDIRECT")
> Reported-by: David Ahern <dsahern@...il.com>
> Tested-by: David Ahern <dsahern@...il.com>
> Signed-off-by: Jason Wang <jasowang@...hat.com>

Acked-by: Michael S. Tsirkin <mst@...hat.com>

> ---
>  drivers/net/virtio_net.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 770422e..c15d240 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -787,7 +787,7 @@ 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:
> -- 
> 2.7.4