bridge: vlan: flush the dynamically learned entries on port vlan delete

Add a new argument to br_fdb_delete_by_port which allows to specify a
vid to match when flushing entries and use it in nbp_vlan_delete() to
flush the dynamically learned entries of the vlan/port pair when removing
a vlan from a port. Before this patch only the local mac was being
removed and the dynamically learned ones were left to expire.
Note that the do_all argument is still respected and if specified, the
vid will be ignored.
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/bridge/br_fdb.c

@@ -330,9 +330,11 @@ void br_fdb_flush(struct net_bridge *br)
 
 /* Flush all entries referring to a specific port.
  * if do_all is set also flush static entries
+ * if vid is set delete all entries that match the vlan_id
  */
 void br_fdb_delete_by_port(struct net_bridge *br,
 			   const struct net_bridge_port *p,
+			   u16 vid,
 			   int do_all)
 {
 	int i;
@@ -347,8 +349,9 @@ void br_fdb_delete_by_port(struct net_bridge *br,
 			if (f->dst != p)
 				continue;
 
-			if (f->is_static && !do_all)
-				continue;
+			if (!do_all)
+				if (f->is_static || (vid && f->vlan_id != vid))
+					continue;
 
 			if (f->is_local)
 				fdb_delete_local(br, p, f);

net/bridge/br_if.c

@@ -249,7 +249,7 @@ static void del_nbp(struct net_bridge_port *p)
 	list_del_rcu(&p->list);
 
 	nbp_vlan_flush(p);
-	br_fdb_delete_by_port(br, p, 1);
+	br_fdb_delete_by_port(br, p, 0, 1);
 	nbp_update_port_count(br);
 
 	netdev_upper_dev_unlink(dev, br->dev);
@@ -278,7 +278,7 @@ void br_dev_delete(struct net_device *dev, struct list_head *head)
 		del_nbp(p);
 	}
 
-	br_fdb_delete_by_port(br, NULL, 1);
+	br_fdb_delete_by_port(br, NULL, 0, 1);
 
 	br_vlan_flush(br);
 	del_timer_sync(&br->gc_timer);

net/bridge/br_private.h

@@ -387,7 +387,7 @@ void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr);
 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
 void br_fdb_cleanup(unsigned long arg);
 void br_fdb_delete_by_port(struct net_bridge *br,
-			   const struct net_bridge_port *p, int do_all);
+			   const struct net_bridge_port *p, u16 vid, int do_all);
 struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
 					  const unsigned char *addr, __u16 vid);
 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);

net/bridge/br_stp_if.c

@@ -111,7 +111,7 @@ void br_stp_disable_port(struct net_bridge_port *p)
 	del_timer(&p->forward_delay_timer);
 	del_timer(&p->hold_timer);
 
-	br_fdb_delete_by_port(br, p, 0);
+	br_fdb_delete_by_port(br, p, 0, 0);
 	br_multicast_disable_port(p);
 
 	br_configuration_update(br);

net/bridge/br_sysfs_if.c

@@ -160,7 +160,7 @@ static BRPORT_ATTR(hold_timer, S_IRUGO, show_hold_timer, NULL);
 
 static int store_flush(struct net_bridge_port *p, unsigned long v)
 {
-	br_fdb_delete_by_port(p->br, p, 0); // Don't delete local entry
+	br_fdb_delete_by_port(p->br, p, 0, 0); // Don't delete local entry
 	return 0;
 }
 static BRPORT_ATTR(flush, S_IWUSR, NULL, store_flush);

net/bridge/br_vlan.c

@@ -741,6 +741,7 @@ int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
 		return -EINVAL;
 
 	br_fdb_find_delete_local(port->br, port, port->dev->dev_addr, vid);
+	br_fdb_delete_by_port(port->br, port, vid, 0);
 
 	return __vlan_del(pv, vid);
 }