_(TUNNEL_EXIST, -75, "Tunnel already exists") \
_(INVALID_DECAP_NEXT, -76, "Invalid decap-next") \
_(RESPONSE_NOT_READY, -77, "Response not ready") \
-_(NOT_CONNECTED, -78, "Not connected to the data plane")
+_(NOT_CONNECTED, -78, "Not connected to the data plane") \
+_(IF_ALREADY_EXISTS, -79, "Interface already exists")
typedef enum {
#define _(a,b,c) VNET_API_ERROR_##a = (b),