[PATCH net-next 2/4] net: bridge: Handle changes in VLAN_FLAG_BRIDGE_BINDING

[Petr Machata]

When bridge binding is enabled on a VLAN netdevice, its link state should
track bridge ports that are members of the corresponding VLAN. This works
for newly-added netdevices. However toggling the option does not have the
effect of enabling or disabling the behavior as appropriate.

In this patch, react to bridge_binding toggles on VLAN uppers.

Signed-off-by: Petr Machata <pe...@nvidia.com>
Reviewed-by: Ido Schimmel <ido...@nvidia.com>
---
 net/bridge/br.c         |  7 +++++++
 net/bridge/br_private.h |  9 +++++++++
 net/bridge/br_vlan.c    | 24 ++++++++++++++++++++++++
 3 files changed, 40 insertions(+)

diff --git a/net/bridge/br.c b/net/bridge/br.c
index 2cab878e0a39..183fcb362f9e 100644
--- a/net/bridge/br.c
+++ b/net/bridge/br.c
@@ -51,6 +51,13 @@ static int br_device_event(struct notifier_block *unused, 
unsigned long event, v
                }
        }
 
+       if (is_vlan_dev(dev)) {
+               struct net_device *real_dev = vlan_dev_real_dev(dev);
+
+               if (netif_is_bridge_master(real_dev))
+                       br_vlan_vlan_upper_event(real_dev, dev, event);
+       }
+
        /* not a port of a bridge */
        p = br_port_get_rtnl(dev);
        if (!p)
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 9853cfbb9d14..29d6ec45cf41 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -1571,6 +1571,9 @@ void br_vlan_get_stats(const struct net_bridge_vlan *v,
 void br_vlan_port_event(struct net_bridge_port *p, unsigned long event);
 int br_vlan_bridge_event(struct net_device *dev, unsigned long event,
                         void *ptr);
+void br_vlan_vlan_upper_event(struct net_device *br_dev,
+                             struct net_device *vlan_dev,
+                             unsigned long event);
 int br_vlan_rtnl_init(void);
 void br_vlan_rtnl_uninit(void);
 void br_vlan_notify(const struct net_bridge *br,
@@ -1802,6 +1805,12 @@ static inline int br_vlan_bridge_event(struct net_device 
*dev,
        return 0;
 }
 
+static inline void br_vlan_vlan_upper_event(struct net_device *br_dev,
+                                           struct net_device *vlan_dev,
+                                           unsigned long event)
+{
+}
+
 static inline int br_vlan_rtnl_init(void)
 {
        return 0;
diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c
index b728b71e693f..d9a69ec9affe 100644
--- a/net/bridge/br_vlan.c
+++ b/net/bridge/br_vlan.c
@@ -1772,6 +1772,30 @@ int br_vlan_bridge_event(struct net_device *dev, 
unsigned long event, void *ptr)
        return ret;
 }
 
+void br_vlan_vlan_upper_event(struct net_device *br_dev,
+                             struct net_device *vlan_dev,
+                             unsigned long event)
+{
+       struct vlan_dev_priv *vlan = vlan_dev_priv(vlan_dev);
+       struct net_bridge *br = netdev_priv(br_dev);
+       bool bridge_binding;
+
+       switch (event) {
+       case NETDEV_CHANGE:
+       case NETDEV_UP:
+               break;
+       default:
+               return;
+       }
+
+       bridge_binding = vlan->flags & VLAN_FLAG_BRIDGE_BINDING;
+       br_vlan_toggle_bridge_binding(br_dev, bridge_binding);
+       if (bridge_binding)
+               br_vlan_set_vlan_dev_state(br, vlan_dev);
+       else if (!bridge_binding && netif_carrier_ok(br_dev))
+               netif_carrier_on(vlan_dev);
+}
+
 /* Must be protected by RTNL. */
 void br_vlan_port_event(struct net_bridge_port *p, unsigned long event)
 {
-- 
2.47.0