USABLE_RX_BD_PER_PAGE
rxbd = &rxr->rx_bd_chain[i][USABLE_RX_BD_PER_PAGE];
if ((hw_cons & USABLE_RX_BD_PER_PAGE) == USABLE_RX_BD_PER_PAGE)
#define USABLE_RX_BD(rxr) (USABLE_RX_BD_PER_PAGE * (rxr)->rx_pages)
(((x) & USABLE_RX_BD_PER_PAGE) == (USABLE_RX_BD_PER_PAGE - 1)) ? \
(((x) & ~USABLE_RX_BD_PER_PAGE) >> BCE_RX_BD_PAGE_SHIFT)
#define RX_IDX(x) ((x) & USABLE_RX_BD_PER_PAGE)