net: ethernet: ti: am65-cpsw-nuss: restore vlan configuration while down/up

The vlan configuration is not restored after interface down/up sequence.

Steps to check:
 # ip link add link eth0 name eth0.100 type vlan id 100
 # ifconfig eth0 down
 # ifconfig eth0 up

This patch fixes it, restoring vlan ALE entries on .ndo_open().

Fixes: 93a76530 ("net: ethernet: ti: introduce am65x/j721e gigabit eth subsystem driver")
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/ti/am65-cpsw-nuss.c

@@ -223,6 +223,9 @@ static int am65_cpsw_nuss_ndo_slave_add_vid(struct net_device *ndev,
 	u32 port_mask, unreg_mcast = 0;
 	int ret;
 
+	if (!netif_running(ndev) || !vid)
+		return 0;
+
 	ret = pm_runtime_get_sync(common->dev);
 	if (ret < 0) {
 		pm_runtime_put_noidle(common->dev);
@@ -246,6 +249,9 @@ static int am65_cpsw_nuss_ndo_slave_kill_vid(struct net_device *ndev,
 	struct am65_cpsw_common *common = am65_ndev_to_common(ndev);
 	int ret;
 
+	if (!netif_running(ndev) || !vid)
+		return 0;
+
 	ret = pm_runtime_get_sync(common->dev);
 	if (ret < 0) {
 		pm_runtime_put_noidle(common->dev);
@@ -571,6 +577,16 @@ static int am65_cpsw_nuss_ndo_slave_stop(struct net_device *ndev)
 	return 0;
 }
 
+static int cpsw_restore_vlans(struct net_device *vdev, int vid, void *arg)
+{
+	struct am65_cpsw_port *port = arg;
+
+	if (!vdev)
+		return 0;
+
+	return am65_cpsw_nuss_ndo_slave_add_vid(port->ndev, 0, vid);
+}
+
 static int am65_cpsw_nuss_ndo_slave_open(struct net_device *ndev)
 {
 	struct am65_cpsw_common *common = am65_ndev_to_common(ndev);
@@ -644,6 +660,9 @@ static int am65_cpsw_nuss_ndo_slave_open(struct net_device *ndev)
 		}
 	}
 
+	/* restore vlan configurations */
+	vlan_for_each(ndev, cpsw_restore_vlans, port);
+
 	phy_attached_info(port->slave.phy);
 	phy_start(port->slave.phy);