TOTAL_TX_BD_PER_PAGE
(u_int32_t)TOTAL_TX_BD_PER_PAGE, (u_int32_t)USABLE_TX_BD_PER_PAGE);
#define USABLE_TX_BD_PER_PAGE (TOTAL_TX_BD_PER_PAGE - 1)
#define TOTAL_TX_BD (TOTAL_TX_BD_PER_PAGE * TX_PAGES)