openvswitch: make skb->csum consistent with rest of networking stack.

Following patch keeps skb->csum correct across ovs.

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: Jesse Gross <jesse@nicira.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/net/openvswitch/vport.h b/net/openvswitch/vport.h
index 1cef5cd3be47..293278c4c2df 100644
--- a/net/openvswitch/vport.h
+++ b/net/openvswitch/vport.h
@@ -192,4 +192,11 @@ void ovs_vport_record_error(struct vport *, enum vport_err_type err_type);
 extern const struct vport_ops ovs_netdev_vport_ops;
 extern const struct vport_ops ovs_internal_vport_ops;
 
+static inline void ovs_skb_postpush_rcsum(struct sk_buff *skb,
+                                      const void *start, unsigned int len)
+{
+        if (skb->ip_summed == CHECKSUM_COMPLETE)
+                skb->csum = csum_add(skb->csum, csum_partial(start, len, 0));
+}
+
 #endif /* vport.h */