+static int __ntb_netdev_maybe_stop_tx(struct net_device *netdev,
+ struct ntb_transport_qp *qp, int size)
+{
+ struct ntb_netdev *dev = netdev_priv(netdev);
+
+ netif_stop_queue(netdev);
+ /* Make sure to see the latest value of ntb_transport_tx_free_entry()
+ * since the queue was last started.
+ */
+ smp_mb();
+
+ if (likely(ntb_transport_tx_free_entry(qp) < size)) {
+ mod_timer(&dev->tx_timer, jiffies + usecs_to_jiffies(tx_time));
+ return -EBUSY;
+ }
+
+ netif_start_queue(netdev);
+ return 0;
+}
+
+static int ntb_netdev_maybe_stop_tx(struct net_device *ndev,
+ struct ntb_transport_qp *qp, int size)
+{
+ if (netif_queue_stopped(ndev) ||
+ (ntb_transport_tx_free_entry(qp) >= size))
+ return 0;
+
+ return __ntb_netdev_maybe_stop_tx(ndev, qp, size);
+}
+