r8169: add info for DASH being enabled

In case of problems it facilitates the bug analysis if we know whether
DASH is active. Therefore emit a message in probe if this is the case.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/realtek/r8169_main.c

@@ -5432,8 +5432,10 @@ static int rtl_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 			    jumbo_max, tp->mac_version <= RTL_GIGA_MAC_VER_06 ?
 			    "ok" : "ko");
 
-	if (r8168_check_dash(tp))
+	if (r8168_check_dash(tp)) {
+		netdev_info(dev, "DASH enabled\n");
 		rtl8168_driver_start(tp);
+	}
 
 	if (pci_dev_run_wake(pdev))
 		pm_runtime_put_sync(&pdev->dev);