eth_tx_bd_types
fp->tx_chain = (union eth_tx_bd_types *)fp->tx_dma.vaddr;
#define TX_BD_TOTAL_PER_PAGE (BCM_PAGE_SIZE / sizeof(union eth_tx_bd_types))
union eth_tx_bd_types *tx_chain;
union eth_tx_bd_types bds[13];
union eth_tx_bd_types *p_virt;