datapath/dp_notify.c

   1 /*
   2  * Distributed under the terms of the GNU GPL version 2.
   3  * Copyright (c) 2007, 2008, 2009 Nicira Networks.
   4  *
   5  * Significant portions of this file may be copied from parts of the Linux
   6  * kernel, by Linus Torvalds and others.
   7  */
   8
   9 /* Handle changes to managed devices */
  10
  11 #include <linux/netdevice.h>
  12
  13 #include "datapath.h"
  14 #include "dp_dev.h"
  15
  16 static int dp_device_event(struct notifier_block *unused, unsigned long event,
  17                 void *ptr)
  18 {
  19         struct net_device *dev = ptr;
  20         struct net_bridge_port *p;
  21         struct datapath *dp;
  22
  23         if (is_dp_dev(dev)) {
  24                 struct dp_dev *dp_dev = dp_dev_priv(dev);
  25                 p = dp_dev->dp->ports[dp_dev->port_no];
  26         } else {
  27                 p = dev->br_port;
  28         }
  29         if (!p)
  30                 return NOTIFY_DONE;
  31         dp = p->dp;
  32
  33         switch (event) {
  34         case NETDEV_UNREGISTER:
  35                 mutex_lock(&dp->mutex);
  36                 dp_del_port(p);
  37                 mutex_unlock(&dp->mutex);
  38                 break;
  39
  40         case NETDEV_CHANGENAME:
  41                 if (p->port_no != ODPP_LOCAL) {
  42                         mutex_lock(&dp->mutex);
  43                         dp_sysfs_del_if(p);
  44                         dp_sysfs_add_if(p);
  45                         mutex_unlock(&dp->mutex);
  46                 }
  47                 break;
  48         }
  49         return NOTIFY_DONE;
  50 }
  51
  52 struct notifier_block dp_device_notifier = {
  53         .notifier_call = dp_device_event
  54 };