netdev - [PATCH net-next v3 4/5] bridge: update vlan dev state when port added to or deleted from vlan

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Date:   Thu, 18 Apr 2019 18:35:34 +0100
From:   Mike Manning <mmanning@...tta.att-mail.com>
To:     netdev@...r.kernel.org, nikolay@...ulusnetworks.com,
        roopa@...ulusnetworks.com
Subject: [PATCH net-next v3 4/5] bridge: update vlan dev state when port added to or deleted from vlan

If vlan bridge binding is enabled, then the link state of a vlan device
that is an upper device of the bridge should track the state of bridge
ports that are members of that vlan. So if a bridge port becomes or
stops being a member of a vlan, then update the link state of the
vlan device if necessary.

Signed-off-by: Mike Manning <mmanning@...tta.att-mail.com>
---
 net/bridge/br_vlan.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c
index b903689a8fc5..89146a5f0c23 100644
--- a/net/bridge/br_vlan.c
+++ b/net/bridge/br_vlan.c
@@ -7,6 +7,8 @@
 #include "br_private.h"
 #include "br_private_tunnel.h"
 
+static void nbp_vlan_set_vlan_dev_state(struct net_bridge_port *p, u16 vid);
+
 static inline int br_vlan_cmp(struct rhashtable_compare_arg *arg,
 			      const void *ptr)
 {
@@ -293,6 +295,9 @@ static int __vlan_add(struct net_bridge_vlan *v, u16 flags,
 
 	__vlan_add_list(v);
 	__vlan_add_flags(v, flags);
+
+	if (p)
+		nbp_vlan_set_vlan_dev_state(p, v->vid);
 out:
 	return err;
 
@@ -357,6 +362,7 @@ static int __vlan_del(struct net_bridge_vlan *v)
 		rhashtable_remove_fast(&vg->vlan_hash, &v->vnode,
 				       br_vlan_rht_params);
 		__vlan_del_list(v);
+		nbp_vlan_set_vlan_dev_state(p, v->vid);
 		call_rcu(&v->rcu, nbp_vlan_rcu_free);
 	}
 
@@ -1388,6 +1394,19 @@ static void br_vlan_upper_change(struct net_device *dev,
 }
 
 /* Must be protected by RTNL. */
+static void nbp_vlan_set_vlan_dev_state(struct net_bridge_port *p, u16 vid)
+{
+	struct net_device *vlan_dev;
+
+	if (!br_opt_get(p->br, BROPT_VLAN_BRIDGE_BINDING))
+		return;
+
+	vlan_dev = br_vlan_get_upper_bind_vlan_dev(p->br->dev, vid);
+	if (vlan_dev)
+		br_vlan_set_vlan_dev_state(p->br, vlan_dev);
+}
+
+/* Must be protected by RTNL. */
 void br_vlan_bridge_event(struct net_device *dev, unsigned long event,
 			  void *ptr)
 {
-- 
2.11.0