TXDMA_RING_EMPTY
if (TXDMA_RING_EMPTY(head_index, head_wrap, tail_index, tail_wrap) &&
if (TXDMA_RING_EMPTY(head_index, head_wrap, tail_index,
if (TXDMA_RING_EMPTY(head_index, head_wrap,
if (TXDMA_RING_EMPTY(head_index, head_wrap,