tuntap: introduce multiqueue flags

Add flags to be used by creating multiqueue tuntap device.
Signed-off-by: NJason Wang <jasowang@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/uapi/linux/if_tun.h

@@ -34,6 +34,7 @@
 #define TUN_ONE_QUEUE	0x0080
 #define TUN_PERSIST 	0x0100	
 #define TUN_VNET_HDR 	0x0200
+#define TUN_TAP_MQ      0x0400
 
 /* Ioctl defines */
 #define TUNSETNOCSUM  _IOW('T', 200, int) 
@@ -61,6 +62,7 @@
 #define IFF_ONE_QUEUE	0x2000
 #define IFF_VNET_HDR	0x4000
 #define IFF_TUN_EXCL	0x8000
+#define IFF_MULTI_QUEUE 0x0100
 
 /* Features for GSO (TUNSETOFFLOAD). */
 #define TUN_F_CSUM	0x01	/* You can hand me unchecksummed packets. */