TXDMA_RING_FULL
if (TXDMA_RING_FULL(head_index, head_wrap, tail_index, tail_wrap)) {
if (TXDMA_RING_FULL(head_index, head_wrap, tail_index,
if (TXDMA_RING_FULL(head_index, head_wrap, tail_index,
if (TXDMA_RING_FULL(head_index, head_wrap, tail_index,