commit 146c8a77d27bcbd7722120f70f51e3b287205d0a
author Paul Durrant <Paul.Durrant@citrix.com> Wed Oct 16 17:50:28 2013 +0100
committer David S. Miller <davem@davemloft.net> Thu Oct 17 15:35:14 2013 -0400
tree b7ce7bf02f0967015366284281e31468a45508cf
parent c0f4ace79e7e5bec0ff065c4afa3eb3329c9384c

xen-netback: add support for IPv6 checksum offload to guest

Check xenstore flag feature-ipv6-csum-offload to determine if a
guest is happy to accept IPv6 packets with only partial checksum.

Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Cc: Wei Liu <wei.liu2@citrix.com>
Cc: David Vrabel <david.vrabel@citrix.com>
Cc: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/xen-netback/interface.c

diff --git a/drivers/net/xen-netback/interface.c b/drivers/net/xen-netback/interface.c
index 01bb854..8e92783 100644
--- a/drivers/net/xen-netback/interface.c
+++ b/drivers/net/xen-netback/interface.c
@@ -216,8 +216,10 @@
 		features &= ~NETIF_F_SG;
 	if (!vif->gso && !vif->gso_prefix)
 		features &= ~NETIF_F_TSO;
-	if (!vif->csum)
+	if (!vif->ip_csum)
 		features &= ~NETIF_F_IP_CSUM;
+	if (!vif->ipv6_csum)
+		features &= ~NETIF_F_IPV6_CSUM;
 
 	return features;
 }
@@ -306,7 +308,7 @@
 	vif->domid  = domid;
 	vif->handle = handle;
 	vif->can_sg = 1;
-	vif->csum = 1;
+	vif->ip_csum = 1;
 	vif->dev = dev;
 
 	vif->credit_bytes = vif->remaining_credit = ~0UL;
@@ -316,7 +318,9 @@
 	vif->credit_timeout.expires = jiffies;
 
 	dev->netdev_ops	= &xenvif_netdev_ops;
-	dev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_TSO;
+	dev->hw_features = NETIF_F_SG |
+		NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
+		NETIF_F_TSO;
 	dev->features = dev->hw_features;
 	SET_ETHTOOL_OPS(dev, &xenvif_ethtool_ops);