[PATCH net-next 2/3] ethtool: Core impl for ETHTOOL_PHY_LOOPBACK tunable.

["Allan W. Nielsen" <allan.nielsen@microsemi.com>]

From: Raju Lakkaraju <Raju.Lakkaraju@microsemi.com>

Adding validation support for the ETHTOOL_PHY_LOOPBACK. Functional
implementation needs to be done in the individual PHY drivers.

Signed-off-by: Raju Lakkaraju <Raju.Lakkaraju@microsemi.com>
Signed-off-by: Allan W. Nielsen <allan.nielsen@microsemi.com>
---
 net/core/ethtool.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index e23766c..0542467 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -123,6 +123,7 @@ static const char
 phy_tunable_strings[__ETHTOOL_PHY_TUNABLE_COUNT][ETH_GSTRING_LEN] = {
 	[ETHTOOL_ID_UNSPEC]     = "Unspec",
 	[ETHTOOL_PHY_DOWNSHIFT]	= "phy-downshift",
+	[ETHTOOL_PHY_LOOPBACK]	= "phy-loopback",
 };
 
 static int ethtool_get_features(struct net_device *dev, void __user *useraddr)
@@ -2437,6 +2438,7 @@ static int ethtool_phy_tunable_valid(const struct ethtool_tunable *tuna)
 {
 	switch (tuna->id) {
 	case ETHTOOL_PHY_DOWNSHIFT:
+	case ETHTOOL_PHY_LOOPBACK:
 		if (tuna->len != sizeof(u8) ||
 		    tuna->type_id != ETHTOOL_TUNABLE_U8)
 			return -EINVAL;
-- 
2.7.3