[PATCH net-next 1/6] net: ethernet: ti: am65-cpsw-nuss: restore vlan configuration while down/up

[Grygorii Strashko]

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: 93a76530316a ("net: ethernet: ti: introduce am65x/j721e gigabit eth 
subsystem driver")
Signed-off-by: Grygorii Strashko <grygorii.stras...@ti.com>
---
 drivers/net/ethernet/ti/am65-cpsw-nuss.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c 
b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
index 1492648247d9..82d3b1f20890 100644
--- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c
+++ b/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);
 
-- 
2.17.1