bridge: add sysfs hook to flush forwarding table

The RSTP daemon needs to be able to flush all dynamic forwarding
entries in the case of topology change.

This is a temporary interface. It will change to a netlink interface
before RSTP daemon is officially released.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>

1 files changed, 19 insertions, 0 deletions

diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c
index dd5a5d5fb280..22645e3edf23 100644
--- a/net/bridge/br_fdb.c
+++ b/net/bridge/br_fdb.c
@@ -135,7 +135,26 @@ void br_fdb_cleanup(unsigned long _data)
         mod_timer(&br->gc_timer, jiffies + HZ/10);
 }
 
+/* Completely flush all dynamic entries in forwarding database.*/
+void br_fdb_flush(struct net_bridge *br)
+{
+        int i;
 
+        spin_lock_bh(&br->hash_lock);
+        for (i = 0; i < BR_HASH_SIZE; i++) {
+                struct net_bridge_fdb_entry *f;
+                struct hlist_node *h, *n;
+                hlist_for_each_entry_safe(f, h, n, &br->hash[i], hlist) {
+                        if (!f->is_static)
+                                fdb_delete(f);
+                }
+        }
+        spin_unlock_bh(&br->hash_lock);
+}
+
+/* Flush all entries refering to a specific port.
+ * if do_all is set also flush static entries
+ */
 void br_fdb_delete_by_port(struct net_bridge *br,
                            const struct net_bridge_port *p,
                            int do_all)