RX_DESC_COUNT
KASSERT(total <= RX_DESC_COUNT);
index = sc->sc_rx.cidx & (RX_DESC_COUNT - 1);
sc->sc_rx.pidx = RX_DESC_COUNT;
__SHIFTIN(RX_DESC_COUNT, GENET_RX_DMA_RING_BUF_SIZE_DESC_COUNT) |
RX_DESC_COUNT * GENET_DMA_DESC_SIZE / 4 - 1);
__SHIFTIN(RX_DESC_COUNT >> 4, GENET_RX_DMA_XON_XOFF_THRES_HI));
if_rxr_init(&sc->sc_rx_ring, 2, RX_DESC_COUNT);
for (i = 0; i < RX_DESC_COUNT; i++) {
for (i = 0; i < RX_DESC_COUNT; i++) {