Subject: [PATCHv2 1/8] vxlan: minor output refactoring

From: Stephen Hemminger <[email-masked]>
Date: Tue, 09 Oct 2012 23:35:46 -0700

Move code to find destination to a small function.

Signed-off-by: Stephen Hemminger <[email-masked]>

---
v2 - breakup compound if()

--- a/drivers/net/vxlan.c	2012-10-09 18:08:28.594496129 -0700
+++ b/drivers/net/vxlan.c	2012-10-09 18:08:31.722465071 -0700
@@ -621,6 +621,22 @@ static inline u8 vxlan_ecn_encap(u8 tos,
 	return INET_ECN_encapsulate(tos, inner);
 }
 
+static __be32 vxlan_find_dst(struct vxlan_dev *vxlan, struct sk_buff *skb)
+{
+	const struct ethhdr *eth = (struct ethhdr *) skb->data;
+	const struct vxlan_fdb *f;
+
+	if (is_multicast_ether_addr(eth->h_dest))
+		return vxlan->gaddr;
+
+	f = vxlan_find_mac(vxlan, eth->h_dest);
+	if (f)
+		return f->remote_ip;
+	else
+		return vxlan->gaddr;
+
+}
+
 /* Transmit local packets over Vxlan
  *
  * Outer IP header inherits ECN and DF from inner header.
@@ -632,13 +648,11 @@ static netdev_tx_t vxlan_xmit(struct sk_
 {
 	struct vxlan_dev *vxlan = netdev_priv(dev);
 	struct rtable *rt;
-	const struct ethhdr *eth;
 	const struct iphdr *old_iph;
 	struct iphdr *iph;
 	struct vxlanhdr *vxh;
 	struct udphdr *uh;
 	struct flowi4 fl4;
-	struct vxlan_fdb *f;
 	unsigned int pkt_len = skb->len;
 	u32 hash;
 	__be32 dst;
@@ -646,21 +660,16 @@ static netdev_tx_t vxlan_xmit(struct sk_
 	__u8 tos, ttl;
 	int err;
 
+	dst = vxlan_find_dst(vxlan, skb);
+	if (!dst)
+		goto drop;
+
 	/* Need space for new headers (invalidates iph ptr) */
 	if (skb_cow_head(skb, VXLAN_HEADROOM))
 		goto drop;
 
-	eth = (void *)skb->data;
 	old_iph = ip_hdr(skb);
 
-	if (!is_multicast_ether_addr(eth->h_dest) &&
-	    (f = vxlan_find_mac(vxlan, eth->h_dest)))
-		dst = f->remote_ip;
-	else if (vxlan->gaddr) {
-		dst = vxlan->gaddr;
-	} else
-		goto drop;
-
 	ttl = vxlan->ttl;
 	if (!ttl && IN_MULTICAST(ntohl(dst)))
 		ttl = 1;