IB/ipoib: Let lower driver handle get_stats64 call

The driver checks if the lower level driver supports get_stats, and if
so calls it to get the updated statistics, otherwise takes from the
current netdevice stats object.
Signed-off-by: NErez Shitrit <erezsh@mellanox.com>
Reviewed-by: NAlex Vesker <valex@mellanox.com>
Signed-off-by: NLeon Romanovsky <leon@kernel.org>
Reviewed-by: NYuval Shaia <yuval.shaia@oracle.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>

drivers/infiniband/ulp/ipoib/ipoib_main.c

@@ -276,6 +276,17 @@ static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
 	return ret;
 }
 
+static void ipoib_get_stats(struct net_device *dev,
+			    struct rtnl_link_stats64 *stats)
+{
+	struct ipoib_dev_priv *priv = ipoib_priv(dev);
+
+	if (priv->rn_ops->ndo_get_stats64)
+		priv->rn_ops->ndo_get_stats64(dev, stats);
+	else
+		netdev_stats_to_stats64(stats, &dev->stats);
+}
+
 /* Called with an RCU read lock taken */
 static bool ipoib_is_dev_match_addr_rcu(const struct sockaddr *addr,
 					struct net_device *dev)
@@ -1823,6 +1834,7 @@ static const struct net_device_ops ipoib_netdev_ops_pf = {
 	.ndo_get_vf_stats	 = ipoib_get_vf_stats,
 	.ndo_set_vf_guid	 = ipoib_set_vf_guid,
 	.ndo_set_mac_address	 = ipoib_set_mac,
+	.ndo_get_stats64	 = ipoib_get_stats,
 };
 
 static const struct net_device_ops ipoib_netdev_ops_vf = {