sfc: remove efx_ethtool_nway_reset()

An MDIO-based n-way restart does not make sense for any of the NICs
 supported by this driver, nor for the coming EF100.
Unlike on Falcon (which was already split off into a separate driver),
 the PHY on all of Siena, EF10 and EF100 is managed by MC firmware.
While Siena can talk to the PHY over MDIO, doing so for anything other
 than debugging purposes (mdio_mii_ioctl) is likely to confuse the
 firmware.
(According to the SFC firmware team, this support was originally added
 to the Siena driver early in the development of that product, before
 it was decided to have firmware manage the PHY.)
Signed-off-by: Edward Cree <ecree@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/sfc/ethtool.c

@@ -232,7 +232,6 @@ const struct ethtool_ops efx_ethtool_ops = {
 	.get_regs		= efx_ethtool_get_regs,
 	.get_msglevel		= efx_ethtool_get_msglevel,
 	.set_msglevel		= efx_ethtool_set_msglevel,
-	.nway_reset		= efx_ethtool_nway_reset,
 	.get_link		= ethtool_op_get_link,
 	.get_coalesce		= efx_ethtool_get_coalesce,
 	.set_coalesce		= efx_ethtool_set_coalesce,

drivers/net/ethernet/sfc/ethtool_common.c

@@ -173,14 +173,6 @@ void efx_ethtool_self_test(struct net_device *net_dev,
 		test->flags |= ETH_TEST_FL_FAILED;
 }
 
-/* Restart autonegotiation */
-int efx_ethtool_nway_reset(struct net_device *net_dev)
-{
-	struct efx_nic *efx = netdev_priv(net_dev);
-
-	return mdio45_nway_restart(&efx->mdio);
-}
-
 void efx_ethtool_get_pauseparam(struct net_device *net_dev,
 				struct ethtool_pauseparam *pause)
 {

drivers/net/ethernet/sfc/ethtool_common.h

@@ -19,7 +19,6 @@ u32 efx_ethtool_get_msglevel(struct net_device *net_dev);
 void efx_ethtool_set_msglevel(struct net_device *net_dev, u32 msg_enable);
 void efx_ethtool_self_test(struct net_device *net_dev,
 			   struct ethtool_test *test, u64 *data);
-int efx_ethtool_nway_reset(struct net_device *net_dev);
 void efx_ethtool_get_pauseparam(struct net_device *net_dev,
 				struct ethtool_pauseparam *pause);
 int efx_ethtool_set_pauseparam(struct net_device *net_dev,