[PATCH 4/8] netdev: octeon_mgmt: Improve ethtool_ops.

[David Daney <ddaney.cavm@gmail.com>]

From: David Daney <david.daney@cavium.com>

Correctly show no link when the interface is down, and return
-EOPNOTSUPP for things that don't work.  This quiets the ethtool
program when run on down interfaces.

Signed-off-by: David Daney <david.daney@cavium.com>
---
 drivers/net/ethernet/octeon/octeon_mgmt.c | 22 ++++++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/octeon/octeon_mgmt.c 
b/drivers/net/ethernet/octeon/octeon_mgmt.c
index 687a6a0..cf06cf2 100644
--- a/drivers/net/ethernet/octeon/octeon_mgmt.c
+++ b/drivers/net/ethernet/octeon/octeon_mgmt.c
@@ -1379,7 +1379,7 @@ static int octeon_mgmt_get_settings(struct net_device 
*netdev,
        if (p->phydev)
                return phy_ethtool_gset(p->phydev, cmd);
 
-       return -EINVAL;
+       return -EOPNOTSUPP;
 }
 
 static int octeon_mgmt_set_settings(struct net_device *netdev,
@@ -1393,14 +1393,28 @@ static int octeon_mgmt_set_settings(struct net_device 
*netdev,
        if (p->phydev)
                return phy_ethtool_sset(p->phydev, cmd);
 
-       return -EINVAL;
+       return -EOPNOTSUPP;
+}
+
+static int octeon_mgmt_nway_reset(struct net_device *dev)
+{
+       struct octeon_mgmt *p = netdev_priv(dev);
+
+       if (!capable(CAP_NET_ADMIN))
+               return -EPERM;
+
+       if (p->phydev)
+               return phy_start_aneg(p->phydev);
+
+       return -EOPNOTSUPP;
 }
 
 static const struct ethtool_ops octeon_mgmt_ethtool_ops = {
        .get_drvinfo = octeon_mgmt_get_drvinfo,
-       .get_link = ethtool_op_get_link,
        .get_settings = octeon_mgmt_get_settings,
-       .set_settings = octeon_mgmt_set_settings
+       .set_settings = octeon_mgmt_set_settings,
+       .nway_reset = octeon_mgmt_nway_reset,
+       .get_link = ethtool_op_get_link,
 };
 
 static const struct net_device_ops octeon_mgmt_ops = {
-- 
1.7.11.4