Tell upper layer protocols to allocate skb with additional headroom.
This avoids allocation and copy in local packet sends.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>

--- a/drivers/net/vxlan.c	2012-10-09 10:49:08.238763697 -0700
+++ b/drivers/net/vxlan.c	2012-10-09 10:49:19.830648777 -0700
@@ -977,6 +977,7 @@ static void vxlan_setup(struct net_devic
 
 	eth_hw_addr_random(dev);
 	ether_setup(dev);
+	dev->hard_header_len = ETH_HLEN + VXLAN_HEADROOM;
 
 	dev->netdev_ops = &vxlan_netdev_ops;
 	dev->destructor = vxlan_free;


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