r8169: fix performance issue on RTL8168evl

Disabling TSO but leaving SG active results is a significant
performance drop. Therefore disable also SG on RTL8168evl.
This restores the original performance.

Fixes: 93681cd7 ("r8169: enable HW csum and TSO")
Signed-off-by: Holger Hoffstätte <holger@applied-asynchrony.com>
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/realtek/r8169_main.c

@@ -6898,9 +6898,9 @@ static int rtl_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 
 	/* RTL8168e-vl has a HW issue with TSO */
 	if (tp->mac_version == RTL_GIGA_MAC_VER_34) {
-		dev->vlan_features &= ~NETIF_F_ALL_TSO;
-		dev->hw_features &= ~NETIF_F_ALL_TSO;
-		dev->features &= ~NETIF_F_ALL_TSO;
+		dev->vlan_features &= ~(NETIF_F_ALL_TSO | NETIF_F_SG);
+		dev->hw_features &= ~(NETIF_F_ALL_TSO | NETIF_F_SG);
+		dev->features &= ~(NETIF_F_ALL_TSO | NETIF_F_SG);
 	}
 
 	dev->hw_features |= NETIF_F_RXALL;