inet: Move VRF table lookup to inlined function

Table lookup compiles out when VRF is not enabled.
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/vrf.h

@@ -81,6 +81,25 @@ static inline int vrf_dev_table(const struct net_device *dev)
 	return tb_id;
 }
 
+static inline int vrf_dev_table_ifindex(struct net *net, int ifindex)
+{
+	struct net_device *dev;
+	int tb_id = 0;
+
+	if (!ifindex)
+		return 0;
+
+	rcu_read_lock();
+
+	dev = dev_get_by_index_rcu(net, ifindex);
+	if (dev)
+		tb_id = vrf_dev_table_rcu(dev);
+
+	rcu_read_unlock();
+
+	return tb_id;
+}
+
 /* called with rtnl */
 static inline int vrf_dev_table_rtnl(const struct net_device *dev)
 {
@@ -125,6 +144,11 @@ static inline int vrf_dev_table(const struct net_device *dev)
 	return 0;
 }
 
+static inline int vrf_dev_table_ifindex(struct net *net, int ifindex)
+{
+	return 0;
+}
+
 static inline int vrf_dev_table_rtnl(const struct net_device *dev)
 {
 	return 0;

net/ipv4/af_inet.c

@@ -450,15 +450,7 @@ int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 			goto out;
 	}
 
-	if (sk->sk_bound_dev_if) {
-		struct net_device *dev;
-
-		rcu_read_lock();
-		dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
-		if (dev)
-			tb_id = vrf_dev_table_rcu(dev) ? : tb_id;
-		rcu_read_unlock();
-	}
+	tb_id = vrf_dev_table_ifindex(net, sk->sk_bound_dev_if) ? : tb_id;
 	chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id);
 
 	/* Not specified by any standard per-se, however it breaks too