ip_tunnels: convert the mode field of ip_tunnel_info to flags

The mode field holds a single bit of information only (whether the
ip_tunnel_info struct is for rx or tx). Change the mode field to bit flags.
This allows more mode flags to be added.
Signed-off-by: Jiri Benc <jbenc@redhat.com>
Acked-by: Alexei Starovoitov <ast@plumgrid.com>
Acked-by: Thomas Graf <tgraf@suug.ch>
Acked-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/geneve.c

@@ -623,7 +623,7 @@ static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
 
 	if (geneve->collect_md) {
 		info = skb_tunnel_info(skb);
-		if (unlikely(info && info->mode != IP_TUNNEL_INFO_TX)) {
+		if (unlikely(info && !(info->mode & IP_TUNNEL_INFO_TX))) {
 			netdev_dbg(dev, "no tunnel metadata\n");
 			goto tx_error;
 		}

drivers/net/vxlan.c

@@ -2113,7 +2113,7 @@ static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
 	}
 
 	if (vxlan->flags & VXLAN_F_COLLECT_METADATA &&
-	    info && info->mode == IP_TUNNEL_INFO_TX) {
+	    info && info->mode & IP_TUNNEL_INFO_TX) {
 		vxlan_xmit_one(skb, dev, NULL, false);
 		return NETDEV_TX_OK;
 	}

include/net/dst_metadata.h

@@ -59,7 +59,6 @@ static inline struct metadata_dst *tun_rx_dst(__be16 flags,
 		return NULL;
 
 	info = &tun_dst->u.tun_info;
-	info->mode = IP_TUNNEL_INFO_RX;
 	info->key.tun_flags = flags;
 	info->key.tun_id = tunnel_id;
 	info->key.tp_src = 0;

include/net/ip_tunnels.h

@@ -50,13 +50,8 @@ struct ip_tunnel_key {
 	__be16			tp_dst;
 };
 
-/* Indicates whether the tunnel info structure represents receive
- * or transmit tunnel parameters.
- */
-enum {
-	IP_TUNNEL_INFO_RX,
-	IP_TUNNEL_INFO_TX,
-};
+/* Flags for ip_tunnel_info mode. */
+#define IP_TUNNEL_INFO_TX	0x01	/* represents tx tunnel parameters */
 
 struct ip_tunnel_info {
 	struct ip_tunnel_key	key;

net/ipv4/ip_gre.c

@@ -511,7 +511,7 @@ static void gre_fb_xmit(struct sk_buff *skb, struct net_device *dev)
 	int err;
 
 	tun_info = skb_tunnel_info(skb);
-	if (unlikely(!tun_info || tun_info->mode != IP_TUNNEL_INFO_TX))
+	if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX)))
 		goto err_free_skb;
 
 	key = &tun_info->key;

net/ipv4/route.c

@@ -1696,7 +1696,7 @@ static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr,
 	 */
 
 	tun_info = skb_tunnel_info(skb);
-	if (tun_info && tun_info->mode == IP_TUNNEL_INFO_RX)
+	if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX))
 		fl4.flowi4_tun_key.tun_id = tun_info->key.tun_id;
 	else
 		fl4.flowi4_tun_key.tun_id = 0;

net/ipv6/route.c

@@ -1174,7 +1174,7 @@ void ip6_route_input(struct sk_buff *skb)
 	};
 
 	tun_info = skb_tunnel_info(skb);
-	if (tun_info && tun_info->mode == IP_TUNNEL_INFO_RX)
+	if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX))
 		fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id;
 	skb_dst_drop(skb);
 	skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));