chcr_txq_advance
chcr_txq_advance(&q->q, ndesc);
chcr_txq_advance(&q->q, ndesc);
chcr_txq_advance(&q->q, ndesc);
chcr_txq_advance(&q->q, ndesc);
chcr_txq_advance(&q->q, ndesc);
chcr_txq_advance(&q->q, ndesc);