ifmp_ring_enqueue
int ifmp_ring_enqueue(struct ifmp_ring *, void **, int, int, int);
ifmp_ring_enqueue(txq->ift_br, (void **)&txq, 1, TX_BATCH_SIZE, abdicate);
err = ifmp_ring_enqueue(txq->ift_br, (void **)&m, 1, TX_BATCH_SIZE, abdicate);