buffer = ofpbuf_new_with_headroom(VLAN_ETH_HEADER_LEN + ETH_PAYLOAD_MAX,
DP_NETDEV_HEADROOM);
size = ofpbuf_tailroom(buffer);
buffer = ofpbuf_new_with_headroom(VLAN_ETH_HEADER_LEN + ETH_PAYLOAD_MAX,
DP_NETDEV_HEADROOM);
size = ofpbuf_tailroom(buffer);