net: bridge: add support for backup port

[linux-2.6-microblaze.git] / net / bridge / br_sysfs_if.c

diff --git a/net/bridge/br_sysfs_if.c b/net/bridge/br_sysfs_if.c
index 4ac9400..7c87a2f 100644 (file)
--- a/net/bridge/br_sysfs_if.c
+++ b/net/bridge/br_sysfs_if.c
@@ -191,6 +191,38 @@ static int store_group_fwd_mask(struct net_bridge_port *p,
 static BRPORT_ATTR(group_fwd_mask, 0644, show_group_fwd_mask,
                   store_group_fwd_mask);
 
+static ssize_t show_backup_port(struct net_bridge_port *p, char *buf)
+{
+       struct net_bridge_port *backup_p;
+       int ret = 0;
+
+       rcu_read_lock();
+       backup_p = rcu_dereference(p->backup_port);
+       if (backup_p)
+               ret = sprintf(buf, "%s\n", backup_p->dev->name);
+       rcu_read_unlock();
+
+       return ret;
+}
+
+static int store_backup_port(struct net_bridge_port *p, char *buf)
+{
+       struct net_device *backup_dev = NULL;
+       char *nl = strchr(buf, '\n');
+
+       if (nl)
+               *nl = '\0';
+
+       if (strlen(buf) > 0) {
+               backup_dev = __dev_get_by_name(dev_net(p->dev), buf);
+               if (!backup_dev)
+                       return -ENOENT;
+       }
+
+       return nbp_backup_change(p, backup_dev);
+}
+static BRPORT_ATTR_RAW(backup_port, 0644, show_backup_port, store_backup_port);
+
 BRPORT_ATTR_FLAG(hairpin_mode, BR_HAIRPIN_MODE);
 BRPORT_ATTR_FLAG(bpdu_guard, BR_BPDU_GUARD);
 BRPORT_ATTR_FLAG(root_block, BR_ROOT_BLOCK);
@@ -254,6 +286,7 @@ static const struct brport_attribute *brport_attrs[] = {
        &brport_attr_group_fwd_mask,
        &brport_attr_neigh_suppress,
        &brport_attr_isolated,
+       &brport_attr_backup_port,
        NULL
 };