[PATCH RFC net-next 10/10] net: dsa: allow use of phylink managed EEE support

[Russell King (Oracle)]

In order to allow DSA drivers to use phylink managed EEE, changes are
necessary to the DSA .set_eee() and .get_eee() methods. Where drivers
make use of phylink managed EEE, these should just pass the method on
to their phylink implementation without calling the DSA specific
operations.

Signed-off-by: Russell King (Oracle) <rmk+kernel at armlinux.org.uk>
---
 net/dsa/user.c | 25 ++++++++++++++++---------
 1 file changed, 16 insertions(+), 9 deletions(-)

diff --git a/net/dsa/user.c b/net/dsa/user.c
index c74f2b2b92de..6912d2d57486 100644
--- a/net/dsa/user.c
+++ b/net/dsa/user.c
@@ -1233,16 +1233,23 @@ static int dsa_user_set_eee(struct net_device *dev, struct ethtool_keee *e)
 	if (!ds->ops->support_eee || !ds->ops->support_eee(ds, dp->index))
 		return -EOPNOTSUPP;
 
-	/* Port's PHY and MAC both need to be EEE capable */
-	if (!dev->phydev)
-		return -ENODEV;
-
-	if (!ds->ops->set_mac_eee)
-		return -EOPNOTSUPP;
+	/* If the port is using phylink managed EEE, then get_mac_eee is
+	 * unnecessary.
+	 */
+	if (!ds->phylink_mac_ops ||
+	    !ds->phylink_mac_ops->mac_disable_tx_lpi ||
+	    !ds->phylink_mac_ops->mac_enable_tx_lpi) {
+		/* Port's PHY and MAC both need to be EEE capable */
+		if (!dev->phydev)
+			return -ENODEV;
+
+		if (!ds->ops->set_mac_eee)
+			return -EOPNOTSUPP;
 
-	ret = ds->ops->set_mac_eee(ds, dp->index, e);
-	if (ret)
-		return ret;
+		ret = ds->ops->set_mac_eee(ds, dp->index, e);
+		if (ret)
+			return ret;
+	}
 
 	return phylink_ethtool_set_eee(dp->pl, e);
 }
-- 
2.30.2