From: Fuyun Liang <liangfuyun1@huawei.com>
Date: Fri, 3 Nov 2017 12:18:29 +0800
Subject: net: hns3: add support for nway_reset
Patch-mainline: v4.15-rc1
Git-commit: d63671d27cd1cc1f93f5fcb86eaeee57c8190d46
References: bsc#1104353 FATE#326415

This patch adds nway_reset support for ethtool cmd.

Signed-off-by: Fuyun Liang <liangfuyun1@huawei.com>
Signed-off-by: Lipeng <lipeng321@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/hisilicon/hns3/hns3pf/hns3_ethtool.c |   18 ++++++++++++++
 1 file changed, 18 insertions(+)

--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hns3_ethtool.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hns3_ethtool.c
@@ -832,6 +832,23 @@ static int hns3_set_rxnfc(struct net_dev
 	}
 }
 
+static int hns3_nway_reset(struct net_device *netdev)
+{
+	struct phy_device *phy = netdev->phydev;
+
+	if (!netif_running(netdev))
+		return 0;
+
+	/* Only support nway_reset for netdev with phy attached for now */
+	if (!phy)
+		return -EOPNOTSUPP;
+
+	if (phy->autoneg != AUTONEG_ENABLE)
+		return -EINVAL;
+
+	return genphy_restart_aneg(phy);
+}
+
 static const struct ethtool_ops hns3_ethtool_ops = {
 	.self_test = hns3_self_test,
 	.get_drvinfo = hns3_get_drvinfo,
@@ -850,6 +867,7 @@ static const struct ethtool_ops hns3_eth
 	.set_rxfh = hns3_set_rss,
 	.get_link_ksettings = hns3_get_link_ksettings,
 	.set_link_ksettings = hns3_set_link_ksettings,
+	.nway_reset = hns3_nway_reset,
 };
 
 void hns3_ethtool_set_ops(struct net_device *netdev)