[PATCH net-next 2/9] net: dsa: add hook to determine whether EEE is supported

["Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>]

Add a hook to determine whether the switch supports EEE. This will
return false if the switch does not, or true if it does. If the
method is not implemented, we assume (currently) that the switch
supports EEE.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 include/net/dsa.h | 1 +
 net/dsa/user.c    | 8 ++++++++
 2 files changed, 9 insertions(+)

diff --git a/include/net/dsa.h b/include/net/dsa.h
index 72ae65e7246a..aaa75bbaa0ea 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -988,6 +988,7 @@ struct dsa_switch_ops {
 	/*
 	 * Port's MAC EEE settings
 	 */
+	bool	(*support_eee)(struct dsa_switch *ds, int port);
 	int	(*set_mac_eee)(struct dsa_switch *ds, int port,
 			       struct ethtool_keee *e);
 	int	(*get_mac_eee)(struct dsa_switch *ds, int port,
diff --git a/net/dsa/user.c b/net/dsa/user.c
index 0640247b8f0a..b54f61605a57 100644
--- a/net/dsa/user.c
+++ b/net/dsa/user.c
@@ -1228,6 +1228,10 @@ static int dsa_user_set_eee(struct net_device *dev, struct ethtool_keee *e)
 	struct dsa_switch *ds = dp->ds;
 	int ret;
 
+	/* Check whether the switch supports EEE */
+	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;
@@ -1248,6 +1252,10 @@ static int dsa_user_get_eee(struct net_device *dev, struct ethtool_keee *e)
 	struct dsa_switch *ds = dp->ds;
 	int ret;
 
+	/* Check whether the switch supports EEE */
+	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;
-- 
2.30.2