dpaa2-eth: Use stored link settings

Whenever a link state change occurs, we get notified and save
the new link settings in the device's private data. In ethtool
get_link_ksettings, use the stored state instead of interrogating
the firmware each time.
Signed-off-by: Ioana Radulescu <ruxandra.radulescu@nxp.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c

@@ -1222,9 +1222,8 @@ static int link_state_update(struct dpaa2_eth_priv *priv)
 
 	/* Chech link state; speed / duplex changes are not treated yet */
 	if (priv->link_state.up == state.up)
-		return 0;
+		goto out;
 
-	priv->link_state = state;
 	if (state.up) {
 		netif_carrier_on(priv->net_dev);
 		netif_tx_start_all_queues(priv->net_dev);
@@ -1236,6 +1235,9 @@ static int link_state_update(struct dpaa2_eth_priv *priv)
 	netdev_info(priv->net_dev, "Link Event: state %s\n",
 		    state.up ? "up" : "down");
 
+out:
+	priv->link_state = state;
+
 	return 0;
 }
 

drivers/net/ethernet/freescale/dpaa2/dpaa2-ethtool.c

@@ -78,23 +78,14 @@ static int
 dpaa2_eth_get_link_ksettings(struct net_device *net_dev,
 			     struct ethtool_link_ksettings *link_settings)
 {
-	struct dpni_link_state state = {0};
-	int err = 0;
 	struct dpaa2_eth_priv *priv = netdev_priv(net_dev);
 
-	err = dpni_get_link_state(priv->mc_io, 0, priv->mc_token, &state);
-	if (err) {
-		netdev_err(net_dev, "ERROR %d getting link state\n", err);
-		goto out;
-	}
-
 	link_settings->base.autoneg = AUTONEG_DISABLE;
-	if (!(state.options & DPNI_LINK_OPT_HALF_DUPLEX))
+	if (!(priv->link_state.options & DPNI_LINK_OPT_HALF_DUPLEX))
 		link_settings->base.duplex = DUPLEX_FULL;
-	link_settings->base.speed = state.rate;
+	link_settings->base.speed = priv->link_state.rate;
 
-out:
-	return err;
+	return 0;
 }
 
 static void dpaa2_eth_get_strings(struct net_device *netdev, u32 stringset,