vlan: introduce functions to do mass addition/deletion of vids by another device

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>

1 files changed, 44 insertions, 0 deletions

diff --git a/net/8021q/vlan_core.c b/net/8021q/vlan_core.c
index 329e0313e01..1414c931bd3 100644
--- a/net/8021q/vlan_core.c
+++ b/net/8021q/vlan_core.c
@@ -321,3 +321,47 @@ void vlan_vid_del(struct net_device *dev, unsigned short vid)
         }
 }
 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;
+        int err;
+
+        ASSERT_RTNL();
+
+        if (!by_dev->vlan_info)
+                return 0;
+
+        list_for_each_entry(vid_info, &by_dev->vlan_info->vid_list, list) {
+                err = vlan_vid_add(dev, vid_info->vid);
+                if (err)
+                        goto unwind;
+        }
+        return 0;
+
+unwind:
+        list_for_each_entry_continue_reverse(vid_info,
+                                             &by_dev->vlan_info->vid_list,
+                                             list) {
+                vlan_vid_del(dev, vid_info->vid);
+        }
+
+        return err;
+}
+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);
+}
+EXPORT_SYMBOL(vlan_vids_del_by_dev);