tx_rings_t
tx_rings = (p_tx_rings_t)KMEM_ZALLOC(sizeof (tx_rings_t), KM_SLEEP);
KMEM_FREE(tx_rings, sizeof (tx_rings_t));
KMEM_FREE(tx_rings, sizeof (tx_rings_t));
KMEM_ZALLOC(sizeof (tx_rings_t), KM_SLEEP);
KMEM_FREE(nxgep->tx_rings, sizeof (tx_rings_t));