From: Jiri Pirko <jpirko@redhat.com>
Date: Thu, 8 Dec 2011 04:11:19 +0000
Subject: [10/23] vlan: introduce functions to do mass addition/deletion of vids by
 another device

commit 348a1443cc4303c72cf1ee3b26e476fec8e7b5fa upstream.

Introduce functions handy to copy vlan ids from one driver's list to
another.

Signed-off-by: Jiri Pirko <jpirko@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
[bwh: Assume ndo_vlan_rx_add_id still returns void]
---
--- a/include/linux/if_vlan.h
+++ b/include/linux/if_vlan.h
@@ -112,6 +112,10 @@
 extern int vlan_vid_add(struct net_device *dev, unsigned short vid);
 extern void vlan_vid_del(struct net_device *dev, unsigned short vid);
 
+extern int vlan_vids_add_by_dev(struct net_device *dev,
+				const struct net_device *by_dev);
+extern void vlan_vids_del_by_dev(struct net_device *dev,
+				 const struct net_device *by_dev);
 #else
 static inline struct net_device *
 __vlan_find_dev_deep(struct net_device *real_dev, u16 vlan_id)
@@ -151,6 +155,16 @@
 static inline void vlan_vid_del(struct net_device *dev, unsigned short vid)
 {
 }
+
+static inline int vlan_vids_add_by_dev(struct net_device *dev,
+				       const struct net_device *by_dev)
+{
+}
+
+static inline void vlan_vids_del_by_dev(struct net_device *dev,
+					const struct net_device *by_dev)
+{
+}
 #endif
 
 /**
--- a/net/8021q/vlan_core.c
+++ b/net/8021q/vlan_core.c
@@ -202,3 +202,34 @@
 	}
 }
 EXPORT_SYMBOL(vlan_vid_del);
+
+int vlan_vids_add_by_dev(struct net_device *dev,
+			 const struct net_device *by_dev)
+{
+	struct vlan_vid_info *vid_info;
+
+	ASSERT_RTNL();
+
+	if (!by_dev->vlan_info)
+		return;
+
+	list_for_each_entry(vid_info, &by_dev->vlan_info->vid_list, list) {
+		vlan_vid_add(dev, vid_info->vid);
+	}
+	return 0;
+}
+EXPORT_SYMBOL(vlan_vids_add_by_dev);
+
+void vlan_vids_del_by_dev(struct net_device *dev,
+			  const struct net_device *by_dev)
+{
+	struct vlan_vid_info *vid_info;
+
+	ASSERT_RTNL();
+
+	if (!by_dev->vlan_info)
+		return;
+
+	list_for_each_entry(vid_info, &by_dev->vlan_info->vid_list, list)
+		vlan_vid_del(dev, vid_info->vid);
+}