r8152: support pauseparam of ethtool_ops

Support get_pauseparam and set_pauseparam of ethtool_ops.

Signed-off-by: Hayes Wang <hayeswang@realtek.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/usb/r8152.c

@@ -8967,6 +8967,79 @@ static int rtl8152_set_ringparam(struct net_device *netdev,
 	return 0;
 }
 
+static void rtl8152_get_pauseparam(struct net_device *netdev, struct ethtool_pauseparam *pause)
+{
+	struct r8152 *tp = netdev_priv(netdev);
+	u16 bmcr, lcladv, rmtadv;
+	u8 cap;
+
+	if (usb_autopm_get_interface(tp->intf) < 0)
+		return;
+
+	mutex_lock(&tp->control);
+
+	bmcr = r8152_mdio_read(tp, MII_BMCR);
+	lcladv = r8152_mdio_read(tp, MII_ADVERTISE);
+	rmtadv = r8152_mdio_read(tp, MII_LPA);
+
+	mutex_unlock(&tp->control);
+
+	usb_autopm_put_interface(tp->intf);
+
+	if (!(bmcr & BMCR_ANENABLE)) {
+		pause->autoneg = 0;
+		pause->rx_pause = 0;
+		pause->tx_pause = 0;
+		return;
+	}
+
+	pause->autoneg = 1;
+
+	cap = mii_resolve_flowctrl_fdx(lcladv, rmtadv);
+
+	if (cap & FLOW_CTRL_RX)
+		pause->rx_pause = 1;
+
+	if (cap & FLOW_CTRL_TX)
+		pause->tx_pause = 1;
+}
+
+static int rtl8152_set_pauseparam(struct net_device *netdev, struct ethtool_pauseparam *pause)
+{
+	struct r8152 *tp = netdev_priv(netdev);
+	u16 old, new1;
+	u8 cap = 0;
+	int ret;
+
+	ret = usb_autopm_get_interface(tp->intf);
+	if (ret < 0)
+		return ret;
+
+	mutex_lock(&tp->control);
+
+	if (pause->autoneg && !(r8152_mdio_read(tp, MII_BMCR) & BMCR_ANENABLE)) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	if (pause->rx_pause)
+		cap |= FLOW_CTRL_RX;
+
+	if (pause->tx_pause)
+		cap |= FLOW_CTRL_TX;
+
+	old = r8152_mdio_read(tp, MII_ADVERTISE);
+	new1 = (old & ~(ADVERTISE_PAUSE_CAP | ADVERTISE_PAUSE_ASYM)) | mii_advertise_flowctrl(cap);
+	if (old != new1)
+		r8152_mdio_write(tp, MII_ADVERTISE, new1);
+
+out:
+	mutex_unlock(&tp->control);
+	usb_autopm_put_interface(tp->intf);
+
+	return ret;
+}
+
 static const struct ethtool_ops ops = {
 	.supported_coalesce_params = ETHTOOL_COALESCE_USECS,
 	.get_drvinfo = rtl8152_get_drvinfo,
@@ -8989,6 +9062,8 @@ static const struct ethtool_ops ops = {
 	.set_tunable = rtl8152_set_tunable,
 	.get_ringparam = rtl8152_get_ringparam,
 	.set_ringparam = rtl8152_set_ringparam,
+	.get_pauseparam = rtl8152_get_pauseparam,
+	.set_pauseparam = rtl8152_set_pauseparam,
 };
 
 static int rtl8152_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)