TOTAL_RX_BD_PER_PAGE
(u_int32_t)TOTAL_RX_BD_PER_PAGE, (u_int32_t)USABLE_RX_BD_PER_PAGE);
#define USABLE_RX_BD_PER_PAGE (TOTAL_RX_BD_PER_PAGE - 1)
#define TOTAL_RX_BD (TOTAL_RX_BD_PER_PAGE * RX_PAGES)