1 files changed, 46 insertions, 50 deletions

diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index 2ab82fe75ede..e955c5692986 100644
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -617,7 +617,9 @@ static int xennet_start_xmit(struct sk_buff *skb, struct net_device *dev)
 		tx->flags |= XEN_NETTXF_extra_info;
 
 		gso->u.gso.size = skb_shinfo(skb)->gso_size;
-		gso->u.gso.type = XEN_NETIF_GSO_TYPE_TCPV4;
+		gso->u.gso.type = (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) ?
+			XEN_NETIF_GSO_TYPE_TCPV6 :
+			XEN_NETIF_GSO_TYPE_TCPV4;
 		gso->u.gso.pad = 0;
 		gso->u.gso.features = 0;
 
@@ -809,15 +811,18 @@ static int xennet_set_skb_gso(struct sk_buff *skb,
 		return -EINVAL;
 	}
 
-	/* Currently only TCPv4 S.O. is supported. */
-	if (gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV4) {
+	if (gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV4 &&
+	    gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV6) {
 		if (net_ratelimit())
 			pr_warn("Bad GSO type %d\n", gso->u.gso.type);
 		return -EINVAL;
 	}
 
 	skb_shinfo(skb)->gso_size = gso->u.gso.size;
-	skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
+	skb_shinfo(skb)->gso_type =
+		(gso->u.gso.type == XEN_NETIF_GSO_TYPE_TCPV4) ?
+		SKB_GSO_TCPV4 :
+		SKB_GSO_TCPV6;
 
 	/* Header must be checked, and gso_segs computed. */
 	skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
@@ -859,9 +864,7 @@ static RING_IDX xennet_fill_frags(struct netfront_info *np,
 
 static int checksum_setup(struct net_device *dev, struct sk_buff *skb)
 {
-	struct iphdr *iph;
-	int err = -EPROTO;
-	int recalculate_partial_csum = 0;
+	bool recalculate_partial_csum = false;
 
 	/*
 	 * A GSO SKB must be CHECKSUM_PARTIAL. However some buggy
@@ -873,54 +876,14 @@ static int checksum_setup(struct net_device *dev, struct sk_buff *skb)
 		struct netfront_info *np = netdev_priv(dev);
 		np->rx_gso_checksum_fixup++;
 		skb->ip_summed = CHECKSUM_PARTIAL;
-		recalculate_partial_csum = 1;
+		recalculate_partial_csum = true;
 	}
 
 	/* A non-CHECKSUM_PARTIAL SKB does not require setup. */
 	if (skb->ip_summed != CHECKSUM_PARTIAL)
 		return 0;
 
-	if (skb->protocol != htons(ETH_P_IP))
-		goto out;
-
-	iph = (void *)skb->data;
-
-	switch (iph->protocol) {
-	case IPPROTO_TCP:
-		if (!skb_partial_csum_set(skb, 4 * iph->ihl,
-					  offsetof(struct tcphdr, check)))
-			goto out;
-
-		if (recalculate_partial_csum) {
-			struct tcphdr *tcph = tcp_hdr(skb);
-			tcph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr,
-							 skb->len - iph->ihl*4,
-							 IPPROTO_TCP, 0);
-		}
-		break;
-	case IPPROTO_UDP:
-		if (!skb_partial_csum_set(skb, 4 * iph->ihl,
-					  offsetof(struct udphdr, check)))
-			goto out;
-
-		if (recalculate_partial_csum) {
-			struct udphdr *udph = udp_hdr(skb);
-			udph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr,
-							 skb->len - iph->ihl*4,
-							 IPPROTO_UDP, 0);
-		}
-		break;
-	default:
-		if (net_ratelimit())
-			pr_err("Attempting to checksum a non-TCP/UDP packet, dropping a protocol %d packet\n",
-			       iph->protocol);
-		goto out;
-	}
-
-	err = 0;
-
-out:
-	return err;
+	return skb_checksum_setup(skb, recalculate_partial_csum);
 }
 
 static int handle_incoming_queue(struct net_device *dev,
@@ -1233,6 +1196,15 @@ static netdev_features_t xennet_fix_features(struct net_device *dev,
 			features &= ~NETIF_F_SG;
 	}
 
+	if (features & NETIF_F_IPV6_CSUM) {
+		if (xenbus_scanf(XBT_NIL, np->xbdev->otherend,
+				 "feature-ipv6-csum-offload", "%d", &val) < 0)
+			val = 0;
+
+		if (!val)
+			features &= ~NETIF_F_IPV6_CSUM;
+	}
+
 	if (features & NETIF_F_TSO) {
 		if (xenbus_scanf(XBT_NIL, np->xbdev->otherend,
 				 "feature-gso-tcpv4", "%d", &val) < 0)
@@ -1242,6 +1214,15 @@ static netdev_features_t xennet_fix_features(struct net_device *dev,
 			features &= ~NETIF_F_TSO;
 	}
 
+	if (features & NETIF_F_TSO6) {
+		if (xenbus_scanf(XBT_NIL, np->xbdev->otherend,
+				 "feature-gso-tcpv6", "%d", &val) < 0)
+			val = 0;
+
+		if (!val)
+			features &= ~NETIF_F_TSO6;
+	}
+
 	return features;
 }
 
@@ -1380,7 +1361,9 @@ static struct net_device *xennet_create_dev(struct xenbus_device *dev)
 	netif_napi_add(netdev, &np->napi, xennet_poll, 64);
 	netdev->features        = NETIF_F_IP_CSUM | NETIF_F_RXCSUM |
 				  NETIF_F_GSO_ROBUST;
-	netdev->hw_features	= NETIF_F_IP_CSUM | NETIF_F_SG | NETIF_F_TSO;
+	netdev->hw_features	= NETIF_F_SG |
+				  NETIF_F_IPV6_CSUM |
+				  NETIF_F_TSO | NETIF_F_TSO6;
 
 	/*
          * Assume that all hw features are available for now. This set
@@ -1758,6 +1741,19 @@ again:
 		goto abort_transaction;
 	}
 
+	err = xenbus_write(xbt, dev->nodename, "feature-gso-tcpv6", "1");
+	if (err) {
+		message = "writing feature-gso-tcpv6";
+		goto abort_transaction;
+	}
+
+	err = xenbus_write(xbt, dev->nodename, "feature-ipv6-csum-offload",
+			   "1");
+	if (err) {
+		message = "writing feature-ipv6-csum-offload";
+		goto abort_transaction;
+	}
+
 	err = xenbus_transaction_end(xbt, 0);
 	if (err) {
 		if (err == -EAGAIN)