openvswitch: fix a compilation error when CONFIG_INET is not setW!

Fix a openvswitch compilation error when CONFIG_INET is not set:

=====================================================
   In file included from include/net/geneve.h:4:0,
                       from net/openvswitch/flow_netlink.c:45:
		          include/net/udp_tunnel.h: In function 'udp_tunnel_handle_offloads':
			  >> include/net/udp_tunnel.h:100:2: error: implicit declaration of function 'iptunnel_handle_offloads' [-Werror=implicit-function-declaration]
			  >>      return iptunnel_handle_offloads(skb, udp_csum, type);
			  >>           ^
			  >>           >> include/net/udp_tunnel.h:100:2: warning: return makes pointer from integer without a cast
			  >>           >>    cc1: some warnings being treated as errors

=====================================================

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Andy Zhou <azhou@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 36 insertions, 30 deletions

diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index c6f6f69f8961..4706386b7d34 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -147,7 +147,6 @@ config MACVTAP
 config VXLAN
        tristate "Virtual eXtensible Local Area Network (VXLAN)"
        depends on INET
-       select NET_IP_TUNNEL
        select NET_UDP_TUNNEL
        ---help---
           This allows one to create vxlan virtual interfaces that provide
diff --git a/include/net/geneve.h b/include/net/geneve.h
index ce98865318bf..112132cf8e2e 100644
--- a/include/net/geneve.h
+++ b/include/net/geneve.h
@@ -1,22 +1,10 @@
 #ifndef __NET_GENEVE_H
 #define __NET_GENEVE_H  1
 
+#ifdef CONFIG_INET
 #include <net/udp_tunnel.h>
+#endif
 
-struct geneve_sock;
-
-typedef void (geneve_rcv_t)(struct geneve_sock *gs, struct sk_buff *skb);
-
-struct geneve_sock {
-        struct hlist_node       hlist;
-        geneve_rcv_t            *rcv;
-        void                    *rcv_data;
-        struct work_struct      del_work;
-        struct socket           *sock;
-        struct rcu_head         rcu;
-        atomic_t                refcnt;
-        struct udp_offload      udp_offloads;
-};
 
 /* Geneve Header:
  *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
@@ -74,6 +62,22 @@ struct genevehdr {
         struct geneve_opt options[];
 };
 
+#ifdef CONFIG_INET
+struct geneve_sock;
+
+typedef void (geneve_rcv_t)(struct geneve_sock *gs, struct sk_buff *skb);
+
+struct geneve_sock {
+        struct hlist_node       hlist;
+        geneve_rcv_t            *rcv;
+        void                    *rcv_data;
+        struct work_struct      del_work;
+        struct socket           *sock;
+        struct rcu_head         rcu;
+        atomic_t                refcnt;
+        struct udp_offload      udp_offloads;
+};
+
 #define GENEVE_VER 0
 #define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr))
 
@@ -88,4 +92,6 @@ int geneve_xmit_skb(struct geneve_sock *gs, struct rtable *rt,
                     __u8 ttl, __be16 df, __be16 src_port, __be16 dst_port,
                     __be16 tun_flags, u8 vni[3], u8 opt_len, u8 *opt,
                     bool xnet);
-#endif
+#endif /*ifdef CONFIG_INET */
+
+#endif /*ifdef__NET_GENEVE_H */
diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig
index c2035447e649..e682b48e0709 100644
--- a/net/ipv4/Kconfig
+++ b/net/ipv4/Kconfig
@@ -309,6 +309,7 @@ config NET_IPVTI
 
 config NET_UDP_TUNNEL
         tristate
+        select NET_IP_TUNNEL
         default n
 
 config NET_FOU
@@ -321,6 +322,20 @@ config NET_FOU
           network mechanisms and optimizations for UDP (such as ECMP
           and RSS) can be leveraged to provide better service.
 
+config GENEVE
+        tristate "Generic Network Virtualization Encapsulation (Geneve)"
+        depends on INET
+        select NET_UDP_TUNNEL
+        ---help---
+        This allows one to create Geneve virtual interfaces that provide
+        Layer 2 Networks over Layer 3 Networks. Geneve is often used
+        to tunnel virtual network infrastructure in virtualized environments.
+        For more information see:
+          http://tools.ietf.org/html/draft-gross-geneve-01
+
+          To compile this driver as a module, choose M here: the module
+
+
 config INET_AH
         tristate "IP: AH transformation"
         select XFRM_ALGO
@@ -453,20 +468,6 @@ config TCP_CONG_BIC
         increase provides TCP friendliness.
         See http://www.csc.ncsu.edu/faculty/rhee/export/bitcp/
 
-config GENEVE
-        tristate "Generic Network Virtualization Encapsulation (Geneve)"
-        depends on INET
-        select NET_IP_TUNNEL
-        select NET_UDP_TUNNEL
-        ---help---
-        This allows one to create Geneve virtual interfaces that provide
-        Layer 2 Networks over Layer 3 Networks. Geneve is often used
-        to tunnel virtual network infrastructure in virtualized environments.
-        For more information see:
-          http://tools.ietf.org/html/draft-gross-geneve-01
-
-          To compile this driver as a module, choose M here: the module
-
 config TCP_CONG_CUBIC
         tristate "CUBIC TCP"
         default y