TAILQ_CONCAT
TAILQ_CONCAT(&dst->axq_q, &src->axq_q, bf_list);
TAILQ_CONCAT(&cabq->fifo.axq_q, &cabq->axq_q, bf_list);
TAILQ_CONCAT(&rxlist, &sc->sc_rx_rxlist[qtype], bf_list);
TAILQ_CONCAT(&txq->fifo.axq_q, &sq, bf_list);