TX_DESC_OFFSET
TX_DESC_OFFSET(0), AWGE_TX_RING_COUNT * descsz,
TX_DESC_OFFSET(0),
TX_DESC_OFFSET(0),
TX_DESC_OFFSET(start),
TX_DESC_OFFSET(end) - TX_DESC_OFFSET(start),
TX_DESC_OFFSET(start),
TX_DESC_OFFSET(AWGE_TX_RING_COUNT) - TX_DESC_OFFSET(start),
if (TX_DESC_OFFSET(end) - TX_DESC_OFFSET(0) > 0) {
TX_DESC_OFFSET(0),
TX_DESC_OFFSET(end) - TX_DESC_OFFSET(0),
TX_DESC_OFFSET(0),