netdev - Re: [PATCH net-next v3 5/5] xen-netback: enable IPv6 TCP GSO to the guest

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Date:	Fri, 11 Oct 2013 11:09:50 +0100
From:	Wei Liu <wei.liu2@...rix.com>
To:	Paul Durrant <paul.durrant@...rix.com>
CC:	<xen-devel@...ts.xen.org>, <netdev@...r.kernel.org>,
	Wei Liu <wei.liu2@...rix.com>,
	David Vrabel <david.vrabel@...rix.com>,
	Ian Campbell <ian.campbell@...rix.com>
Subject: Re: [PATCH net-next v3 5/5] xen-netback: enable IPv6 TCP GSO to the
 guest

On Thu, Oct 10, 2013 at 04:25:33PM +0100, Paul Durrant wrote:
[...]
>  	return max;
> @@ -312,6 +312,7 @@ static struct xenvif_rx_meta *get_next_rx_buffer(struct xenvif *vif,
>  	req = RING_GET_REQUEST(&vif->rx, vif->rx.req_cons++);
>  
>  	meta = npo->meta + npo->meta_prod++;
> +	meta->gso_type = 0;

Should use XEN_NETIF_GSO_TYPE_NONE here.

>  	meta->gso_size = 0;
>  	meta->size = 0;
[...]
> +	if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) {
> +		gso_type = XEN_NETIF_GSO_TYPE_TCPV4;
> +		gso_size = skb_shinfo(skb)->gso_size;
> +	} else if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) {
> +		gso_type = XEN_NETIF_GSO_TYPE_TCPV6;
> +		gso_size = skb_shinfo(skb)->gso_size;
> +	} else {
> +		gso_type = 0;

Ditto.

> +		gso_size = 0;
> +	}
> +
[...]
> @@ -438,10 +461,13 @@ static int xenvif_gop_skb(struct sk_buff *skb,
>  	req = RING_GET_REQUEST(&vif->rx, vif->rx.req_cons++);
>  	meta = npo->meta + npo->meta_prod++;
>  
> -	if (!vif->gso_prefix)
> -		meta->gso_size = skb_shinfo(skb)->gso_size;
> -	else
> +	if ((1 << gso_type) & vif->gso_mask) {
> +		meta->gso_type = gso_type;
> +		meta->gso_size = gso_size;
> +	} else {
> +		meta->gso_type = 0;

Ditto.

>  		meta->gso_size = 0;
> +	}
>  
>  	meta->size = 0;
>  	meta->id = req->id;
> @@ -587,7 +613,8 @@ void xenvif_rx_action(struct xenvif *vif)
>  
>  		vif = netdev_priv(skb->dev);
>  
> -		if (vif->meta[npo.meta_cons].gso_size && vif->gso_prefix) {
> +		if ((1 << vif->meta[npo.meta_cons].gso_type) &
> +		    vif->gso_prefix_mask) {

The logic is changed here. Why do you remove the test on gso_size?

>  			resp = RING_GET_RESPONSE(&vif->rx,
>  						 vif->rx.rsp_prod_pvt++);
>  
> @@ -624,7 +651,8 @@ void xenvif_rx_action(struct xenvif *vif)
>  					vif->meta[npo.meta_cons].size,
>  					flags);
>  
> -		if (vif->meta[npo.meta_cons].gso_size && !vif->gso_prefix) {
> +		if ((1 << vif->meta[npo.meta_cons].gso_type) &
> +		    vif->gso_mask) {

Ditto.

>  			struct xen_netif_extra_info *gso =
>  				(struct xen_netif_extra_info *)
>  				RING_GET_RESPONSE(&vif->rx,
> @@ -632,8 +660,8 @@ void xenvif_rx_action(struct xenvif *vif)
>  
[...]
>  	 * was turned on by a zero value in (or lack of)
> diff --git a/include/xen/interface/io/netif.h b/include/xen/interface/io/netif.h
> index d7dd8d7..41674bc 100644
> --- a/include/xen/interface/io/netif.h
> +++ b/include/xen/interface/io/netif.h
> @@ -113,6 +113,7 @@ struct xen_netif_tx_request {
>  #define  XEN_NETIF_EXTRA_FLAG_MORE	(1U<<_XEN_NETIF_EXTRA_FLAG_MORE)
>  
>  /* GSO types */
> +#define XEN_NETIF_GSO_TYPE_NONE         (0)

Indentation.

Wei.
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