From: Yufeng Mo <moyufeng@huawei.com>
Date: Sat, 9 May 2020 17:27:41 +0800
Subject: net: hns3: disable auto-negotiation off with 1000M setting in ethtool
Patch-mainline: v5.8-rc1
Git-commit: 81c287e3dda20441c1469426fc9f44c9b2374fa9
References: jsc#SLE-14777

The 802.3 specification does not specify the behavior of
auto-negotiation off with 1000M in PHY. Therefore, some PHY
compatibility issues occur. This patch forbids the setting of
this unreasonable mode by ethtool in driver.

Signed-off-by: Yufeng Mo <moyufeng@huawei.com>
Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c
@@ -777,8 +777,13 @@ static int hns3_set_link_ksettings(struc
 		  cmd->base.autoneg, cmd->base.speed, cmd->base.duplex);
 
 	/* Only support ksettings_set for netdev with phy attached for now */
-	if (netdev->phydev)
+	if (netdev->phydev) {
+		if (cmd->base.speed == SPEED_1000 &&
+		    cmd->base.autoneg == AUTONEG_DISABLE)
+			return -EINVAL;
+
 		return phy_ethtool_ksettings_set(netdev->phydev, cmd);
+	}
 
 	if (handle->pdev->revision == 0x20)
 		return -EOPNOTSUPP;