macb_tx_desc
desc = macb_tx_desc(queue, tail);
desc = macb_tx_desc(queue, 0);
desc = macb_tx_desc(queue, tail);
if (macb_tx_desc(queue, queue->tx_tail)->ctrl & MACB_BIT(TX_USED))
desc = macb_tx_desc(queue, i);
desc = macb_tx_desc(queue, i);
desc = macb_tx_desc(queue, i);
desc = macb_tx_desc(&bp->queues[0], i);
memcpy(&desc, macb_tx_desc(queue, i), desc_size);
desc_curr = macb_tx_desc(queue, curr);
desc_next = macb_tx_desc(queue, next);
desc_curr = macb_tx_desc(queue, curr);