MAX_ETH_FRAME_SIZE
#define MAX_ETH_DATA_SIZE (MAX_ETH_FRAME_SIZE - VLAN_ETH_HLEN - ETH_FCS_LEN)
#define TX_BUF_SIZE MAX_ETH_FRAME_SIZE
if (unlikely((rx_size > (MAX_ETH_FRAME_SIZE+4)) ||
(rx_size <= (MAX_ETH_FRAME_SIZE + 4)) &&
#define TX_BUF_SIZE MAX_ETH_FRAME_SIZE
if(rx_size > (MAX_ETH_FRAME_SIZE + 4) || rx_size < 16) {
rx_size > (MAX_ETH_FRAME_SIZE + 4) ||