bridge: uapi: add per vlan tunnel info

New nested netlink attribute to associate tunnel info per vlan.
This is used by bridge driver to send tunnel metadata to
bridge ports in vlan tunnel mode. This patch also adds new per
port flag IFLA_BRPORT_VLAN_TUNNEL to enable vlan tunnel mode.
off by default.

One example use for this is a vxlan bridging gateway or vtep
which maps vlans to vn-segments (or vnis). User can configure
per-vlan tunnel information which the bridge driver can use
to bridge vlan into the corresponding vn-segment.

Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/if_bridge.h

@@ -47,6 +47,7 @@ struct br_ip_list {
 #define BR_PROXYARP_WIFI BIT(10)
 #define BR_MCAST_FLOOD BIT(11)
 #define BR_MULTICAST_TO_UNICAST BIT(12)
+#define BR_VLAN_TUNNEL BIT(13)
 
 #define BR_DEFAULT_AGEING_TIME (300 * HZ)
 

include/uapi/linux/if_bridge.h

@@ -118,6 +118,7 @@ enum {
  IFLA_BRIDGE_FLAGS,
  IFLA_BRIDGE_MODE,
  IFLA_BRIDGE_VLAN_INFO,
+ IFLA_BRIDGE_VLAN_TUNNEL_INFO,
  __IFLA_BRIDGE_MAX,
 };
 #define IFLA_BRIDGE_MAX (__IFLA_BRIDGE_MAX - 1)
@@ -134,6 +135,16 @@ struct bridge_vlan_info {
  __u16 vid;
 };
 
+enum {
+ IFLA_BRIDGE_VLAN_TUNNEL_UNSPEC,
+ IFLA_BRIDGE_VLAN_TUNNEL_ID,
+ IFLA_BRIDGE_VLAN_TUNNEL_VID,
+ IFLA_BRIDGE_VLAN_TUNNEL_FLAGS,
+ __IFLA_BRIDGE_VLAN_TUNNEL_MAX,
+};
+
+#define IFLA_BRIDGE_VLAN_TUNNEL_MAX (__IFLA_BRIDGE_VLAN_TUNNEL_MAX - 1)
+
 struct bridge_vlan_xstats {
  __u64 rx_bytes;
  __u64 rx_packets;

include/uapi/linux/if_link.h

@@ -322,6 +322,7 @@ enum {
  IFLA_BRPORT_PAD,
  IFLA_BRPORT_MCAST_FLOOD,
  IFLA_BRPORT_MCAST_TO_UCAST,
+ IFLA_BRPORT_VLAN_TUNNEL,
  __IFLA_BRPORT_MAX
 };
 #define IFLA_BRPORT_MAX (__IFLA_BRPORT_MAX - 1)