MTK_MAX_RX_LENGTH_2K
if (mtu + MTK_RX_ETH_HLEN < MTK_MAX_RX_LENGTH_2K)
mtu = MTK_MAX_RX_LENGTH_2K - MTK_RX_ETH_HLEN;
WARN_ON(buf_size < MTK_MAX_RX_LENGTH_2K);
eth->netdev[id]->max_mtu = MTK_MAX_RX_LENGTH_2K - MTK_RX_ETH_HLEN;