netdev - Re: [PATCH net 5/9] virtio-net: unbreak csumed packets for XDP

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Date:   Fri, 23 Dec 2016 07:58:06 -0800
From:   John Fastabend <john.fastabend@...il.com>
To:     Jason Wang <jasowang@...hat.com>, mst@...hat.com,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     john.r.fastabend@...el.com
Subject: Re: [PATCH net 5/9] virtio-net: unbreak csumed packets for XDP_PASS

On 16-12-23 06:37 AM, Jason Wang wrote:
> We drop csumed packet when do XDP for packets. This breaks
> XDP_PASS when GUEST_CSUM is supported. Fix this by allowing csum flag
> to be set. With this patch, simple TCP works for XDP_PASS.
> 
> Cc: John Fastabend <john.r.fastabend@...el.com>
> Signed-off-by: Jason Wang <jasowang@...hat.com>
> ---
>  drivers/net/virtio_net.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 470293e..0778dc8 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -440,7 +440,7 @@ static struct sk_buff *receive_big(struct net_device *dev,
>  		struct virtio_net_hdr_mrg_rxbuf *hdr = buf;
>  		u32 act;
>  
> -		if (unlikely(hdr->hdr.gso_type || hdr->hdr.flags))
> +		if (unlikely(hdr->hdr.gso_type))
>  			goto err_xdp;
>  		act = do_xdp_prog(vi, rq, xdp_prog, page, 0, len);
>  		switch (act) {
> @@ -572,7 +572,7 @@ static struct sk_buff *receive_mergeable(struct net_device *dev,
>  		 * the receive path after XDP is loaded. In practice I
>  		 * was not able to create this condition.
>  		 */
> -		if (unlikely(hdr->hdr.gso_type || hdr->hdr.flags))
> +		if (unlikely(hdr->hdr.gso_type))
>  			goto err_xdp;
>  
>  		act = do_xdp_prog(vi, rq, xdp_prog, xdp_page, offset, len);
> 

Acked-by: John Fastabend <john.r.fastabend@...el.com>