txrx_desc_t
struct txrx_desc_t *ptxrxdesc;
sizeof(struct txrx_desc_t) + sizeof(struct rx_status_t));
struct txrx_desc_t *tx_desc_v;
struct txrx_desc_t *rx_desc_v;
struct txrx_desc_t *ptxrxdesc;
tbuff += sizeof(struct txrx_desc_t) * ENET_TX_DESC;
tbuff += sizeof(struct txrx_desc_t) * ENET_RX_DESC;