2 files changed, 30 insertions, 2 deletions
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_mac.c b/drivers/net/ethernet/microchip/lan966x/lan966x_mac.c
index 2679111ef669..005e56ea5da1 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_mac.c
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_mac.c
@@ -346,7 +346,7 @@ static void lan966x_mac_irq_process(struct lan966x *lan966x, u32 row,
 
 			lan966x_mac_process_raw_entry(&raw_entries[column],
 						      mac, &vid, &dest_idx);
-			if (WARN_ON(dest_idx > lan966x->num_phys_ports))
+			if (WARN_ON(dest_idx >= lan966x->num_phys_ports))
 				continue;
 
 			/* If the entry in SW is found, then there is nothing
@@ -393,7 +393,7 @@ static void lan966x_mac_irq_process(struct lan966x *lan966x, u32 row,
 
 		lan966x_mac_process_raw_entry(&raw_entries[column],
 					      mac, &vid, &dest_idx);
-		if (WARN_ON(dest_idx > lan966x->num_phys_ports))
+		if (WARN_ON(dest_idx >= lan966x->num_phys_ports))
 			continue;
 
 		mac_entry = lan966x_mac_alloc_entry(mac, vid, dest_idx);
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_main.c b/drivers/net/ethernet/microchip/lan966x/lan966x_main.c
index 95830e3e2b1f..05f6dcc9dfd5 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_main.c
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_main.c
@@ -103,6 +103,24 @@ static int lan966x_create_targets(struct platform_device *pdev,
 	return 0;
 }
 
+static bool lan966x_port_unique_address(struct net_device *dev)
+{
+	struct lan966x_port *port = netdev_priv(dev);
+	struct lan966x *lan966x = port->lan966x;
+	int p;
+
+	for (p = 0; p < lan966x->num_phys_ports; ++p) {
+		port = lan966x->ports[p];
+		if (!port || port->dev == dev)
+			continue;
+
+		if (ether_addr_equal(dev->dev_addr, port->dev->dev_addr))
+			return false;
+	}
+
+	return true;
+}
+
 static int lan966x_port_set_mac_address(struct net_device *dev, void *p)
 {
 	struct lan966x_port *port = netdev_priv(dev);
@@ -110,16 +128,26 @@ static int lan966x_port_set_mac_address(struct net_device *dev, void *p)
 	const struct sockaddr *addr = p;
 	int ret;
 
+	if (ether_addr_equal(addr->sa_data, dev->dev_addr))
+		return 0;
+
 	/* Learn the new net device MAC address in the mac table. */
 	ret = lan966x_mac_cpu_learn(lan966x, addr->sa_data, HOST_PVID);
 	if (ret)
 		return ret;
 
+	/* If there is another port with the same address as the dev, then don't
+	 * delete it from the MAC table
+	 */
+	if (!lan966x_port_unique_address(dev))
+		goto out;
+
 	/* Then forget the previous one. */
 	ret = lan966x_mac_cpu_forget(lan966x, dev->dev_addr, HOST_PVID);
 	if (ret)
 		return ret;
 
+out:
 	eth_hw_addr_set(dev, addr->sa_data);
 	return ret;
 }