OCTEON_MGMT_RX_HEADROOM
netdev->min_mtu = 64 - OCTEON_MGMT_RX_HEADROOM;
netdev->max_mtu = 16383 - OCTEON_MGMT_RX_HEADROOM - VLAN_HLEN;
size = netdev->mtu + OCTEON_MGMT_RX_HEADROOM + 8 + NET_IP_ALIGN;
ETH_FRAME_LEN + OCTEON_MGMT_RX_HEADROOM,