VXLAN: Use IP Tunnels tunnel ENC encap API

Use common ecn_encap functions from ip_tunnel module.
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Acked-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/vxlan.c

@@ -864,28 +864,6 @@ static bool route_shortcircuit(struct net_device *dev, struct sk_buff *skb)
 	return false;
 }
 
-/* Extract dsfield from inner protocol */
-static inline u8 vxlan_get_dsfield(const struct iphdr *iph,
-				   const struct sk_buff *skb)
-{
-	if (skb->protocol == htons(ETH_P_IP))
-		return iph->tos;
-	else if (skb->protocol == htons(ETH_P_IPV6))
-		return ipv6_get_dsfield((const struct ipv6hdr *)iph);
-	else
-		return 0;
-}
-
-/* Propogate ECN bits out */
-static inline u8 vxlan_ecn_encap(u8 tos,
-				 const struct iphdr *iph,
-				 const struct sk_buff *skb)
-{
-	u8 inner = vxlan_get_dsfield(iph, skb);
-
-	return INET_ECN_encapsulate(tos, inner);
-}
-
 static void vxlan_sock_free(struct sk_buff *skb)
 {
 	sock_put(skb->sk);
@@ -996,7 +974,7 @@ static netdev_tx_t vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
 
 	tos = vxlan->tos;
 	if (tos == 1)
-		tos = vxlan_get_dsfield(old_iph, skb);
+		tos = ip_tunnel_get_dsfield(old_iph, skb);
 
 	src_port = vxlan_src_port(vxlan, skb);
 
@@ -1047,7 +1025,7 @@ static netdev_tx_t vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
 	iph->ihl	= sizeof(struct iphdr) >> 2;
 	iph->frag_off	= df;
 	iph->protocol	= IPPROTO_UDP;
-	iph->tos	= vxlan_ecn_encap(tos, old_iph, skb);
+	iph->tos	= ip_tunnel_ecn_encap(tos, old_iph, skb);
 	iph->daddr	= dst;
 	iph->saddr	= fl4.saddr;
 	iph->ttl	= ttl ? : ip4_dst_hoplimit(&rt->dst);