TX_DESC_COUNT
__SHIFTIN(TX_DESC_COUNT, GENET_TX_DMA_RING_BUF_SIZE_DESC_COUNT) |
TX_DESC_COUNT * GENET_DMA_DESC_SIZE / 4 - 1);
for (i = 0; i < TX_DESC_COUNT; i++) {
index = sc->sc_tx.pidx & (TX_DESC_COUNT - 1);
if (queued >= TX_DESC_COUNT - TX_MAX_SEGS)
for (i = 0; i < TX_DESC_COUNT; i++) {