linux-kernel - Re: [PATCH net] virtio-net: unbreak cusmed packet for small buffer XDP

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Message-ID: <20170628050057-mutt-send-email-mst@kernel.org>
Date:   Wed, 28 Jun 2017 05:02:46 +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] virtio-net: unbreak cusmed packet for small buffer
 XDP

On Wed, Jun 28, 2017 at 09:54:03AM +0800, Jason Wang wrote:
> We should allow csumed packet for small buffer, otherwise XDP_PASS
> won't work correctly.
> 
> Fixes commit bb91accf2733 ("virtio-net: XDP support for small buffers")
> Signed-off-by: Jason Wang <jasowang@...hat.com>

The issue would be VIRTIO_NET_HDR_F_DATA_VALID might be set.
What do you think?

> ---
> The patch is needed for -stable.
> ---
>  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 143d8a9..499fcc9 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -413,7 +413,7 @@ static struct sk_buff *receive_small(struct net_device *dev,
>  		void *orig_data;
>  		u32 act;
>  
> -		if (unlikely(hdr->hdr.gso_type || hdr->hdr.flags))
> +		if (unlikely(hdr->hdr.gso_type))
>  			goto err_xdp;
>  
>  		xdp.data_hard_start = buf + VIRTNET_RX_PAD + vi->hdr_len;
> -- 
> 2.7.4