yge_alloc_ring
rv = yge_alloc_ring(NULL, dev, &dev->d_status_ring, YGE_STAT_RING_CNT);
rv = yge_alloc_ring(port, NULL, &port->p_tx_ring, YGE_TX_RING_CNT);
rv = yge_alloc_ring(port, NULL, &port->p_rx_ring, YGE_RX_RING_CNT);
static int yge_alloc_ring(yge_port_t *, yge_dev_t *, yge_ring_t *, uint32_t);