net: hsr: Add support for MC filtering at the slave device

When MC (multicast) list is updated by the networking layer due to a
user command and as well as when allmulti flag is set, it needs to be
passed to the enslaved Ethernet devices. This patch allows this
to happen by implementing ndo_change_rx_flags() and ndo_set_rx_mode()
API calls that in turns pass it to the slave devices using
existing API calls.

Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
Signed-off-by: Ravi Gunasekaran <r-gunasekaran@ti.com>
Reviewed-by: Wojciech Drewek <wojciech.drewek@intel.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/hsr/hsr_device.c

@@ -173,7 +173,24 @@ static int hsr_dev_open(struct net_device *dev)
 
 static int hsr_dev_close(struct net_device *dev)
 {
-	/* Nothing to do here. */
+	struct hsr_port *port;
+	struct hsr_priv *hsr;
+
+	hsr = netdev_priv(dev);
+	hsr_for_each_port(hsr, port) {
+		if (port->type == HSR_PT_MASTER)
+			continue;
+		switch (port->type) {
+		case HSR_PT_SLAVE_A:
+		case HSR_PT_SLAVE_B:
+			dev_uc_unsync(port->dev, dev);
+			dev_mc_unsync(port->dev, dev);
+			break;
+		default:
+			break;
+		}
+	}
+
 	return 0;
 }
 
@@ -404,12 +421,60 @@ void hsr_del_ports(struct hsr_priv *hsr)
 		hsr_del_port(port);
 }
 
+static void hsr_set_rx_mode(struct net_device *dev)
+{
+	struct hsr_port *port;
+	struct hsr_priv *hsr;
+
+	hsr = netdev_priv(dev);
+
+	hsr_for_each_port(hsr, port) {
+		if (port->type == HSR_PT_MASTER)
+			continue;
+		switch (port->type) {
+		case HSR_PT_SLAVE_A:
+		case HSR_PT_SLAVE_B:
+			dev_mc_sync_multiple(port->dev, dev);
+			dev_uc_sync_multiple(port->dev, dev);
+			break;
+		default:
+			break;
+		}
+	}
+}
+
+static void hsr_change_rx_flags(struct net_device *dev, int change)
+{
+	struct hsr_port *port;
+	struct hsr_priv *hsr;
+
+	hsr = netdev_priv(dev);
+
+	hsr_for_each_port(hsr, port) {
+		if (port->type == HSR_PT_MASTER)
+			continue;
+		switch (port->type) {
+		case HSR_PT_SLAVE_A:
+		case HSR_PT_SLAVE_B:
+			if (change & IFF_ALLMULTI)
+				dev_set_allmulti(port->dev,
+						 dev->flags &
+						 IFF_ALLMULTI ? 1 : -1);
+			break;
+		default:
+			break;
+		}
+	}
+}
+
 static const struct net_device_ops hsr_device_ops = {
 	.ndo_change_mtu = hsr_dev_change_mtu,
 	.ndo_open = hsr_dev_open,
 	.ndo_stop = hsr_dev_close,
 	.ndo_start_xmit = hsr_dev_xmit,
+	.ndo_change_rx_flags = hsr_change_rx_flags,
 	.ndo_fix_features = hsr_fix_features,
+	.ndo_set_rx_mode = hsr_set_rx_mode,
 };
 
 static struct device_type hsr_type = {