r8169: hardware flow control

The datasheet suggests that the device handles the hardware flow
control almost automagically. User report a different story, so
let's try to twiddle the mii registers.
Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>

drivers/net/r8169.c

@@ -771,6 +771,8 @@ static int rtl8169_set_speed_xmii(struct net_device *dev,
 			auto_nego &= ~(PHY_Cap_10_Half | PHY_Cap_100_Half);
 	}
 
+	auto_nego |= ADVERTISE_PAUSE_CAP | ADVERTISE_PAUSE_ASYM;
+
 	tp->phy_auto_nego_reg = auto_nego;
 	tp->phy_1000_ctrl_reg = giga_ctrl;
 
@@ -962,6 +964,11 @@ static void rtl8169_gset_xmii(struct net_device *dev, struct ethtool_cmd *cmd)
 	else if (status & _10bps)
 		cmd->speed = SPEED_10;
 
+	if (status & TxFlowCtrl)
+		cmd->advertising |= ADVERTISED_Asym_Pause;
+	if (status & RxFlowCtrl)
+		cmd->advertising |= ADVERTISED_Pause;
+
 	cmd->duplex = ((status & _1000bpsF) || (status & FullDup)) ?
 		      DUPLEX_FULL : DUPLEX_HALF;
 }