RX_SGE_TOTAL_PER_PAGE
&fp->rx_sge_chain[RX_SGE_TOTAL_PER_PAGE * j - 2];
int idx = RX_SGE_TOTAL_PER_PAGE * i - 1;
#define RX_SGE_USABLE_PER_PAGE (RX_SGE_TOTAL_PER_PAGE - RX_SGE_NEXT_PAGE_DESC_CNT)
#define RX_SGE_PER_PAGE_MASK (RX_SGE_TOTAL_PER_PAGE - 1)
#define RX_SGE_TOTAL (RX_SGE_TOTAL_PER_PAGE * RX_SGE_NUM_PAGES)
((RX_SGE_NUM_PAGES * RX_SGE_TOTAL_PER_PAGE) / RX_SGE_MASK_ELEM_SZ)