+ TAP_API_FLAG_GSO = 1, /* enable gso on the interface */
+ TAP_API_FLAG_CSUM_OFFLOAD = 2, /* enable checksum offload without gso on the interface */
+ TAP_API_FLAG_PERSIST = 4, /* make the interface persistence to exist in linux even vpp crash/restart */
+ TAP_API_FLAG_ATTACH = 8, /* attach to the existing persistence interface after vpp crash/restart */
+ TAP_API_FLAG_TUN = 16, /* create TUN interface instead of tap */
+ TAP_API_FLAG_GRO_COALESCE = 32, /* enable packet coalescing on tx side, provided gso enabled */