datapath/dp_notify.c

   1 /*
   2  * Distributed under the terms of the GNU GPL version 2.
   3  * Copyright (c) 2007, 2008 The Board of Trustees of The Leland
   4  * Stanford Junior University
   5  */
   6
   7 /* Handle changes to managed devices */
   8
   9 #include <linux/netdevice.h>
  10
  11 #include "datapath.h"
  12
  13
  14 static int dp_device_event(struct notifier_block *unused, unsigned long event,
  15                 void *ptr)
  16 {
  17         struct net_device *dev = ptr;
  18         struct net_bridge_port *p = dev->br_port;
  19         unsigned long int flags;
  20         uint32_t orig_status;
  21
  22
  23         /* Check if monitored port */
  24         if (!p)
  25                 return NOTIFY_DONE;
  26
  27         spin_lock_irqsave(&p->lock, flags);
  28         orig_status = p->status;
  29
  30         switch (event) {
  31                 case NETDEV_CHANGE:
  32                         if (netif_carrier_ok(p->dev))
  33                                 p->status &= ~OFPPFL_LINK_DOWN;
  34                         else
  35                                 p->status |= OFPPFL_LINK_DOWN;
  36                         break;
  37
  38                 case NETDEV_DOWN:
  39                         p->status |= OFPPFL_PORT_DOWN;
  40                         break;
  41
  42                 case NETDEV_UP:
  43                         p->status &= ~OFPPFL_PORT_DOWN;
  44                         break;
  45
  46                 case NETDEV_UNREGISTER:
  47                         /* xxx Make sure this is correct */
  48                         spin_unlock_irqrestore(&p->lock, flags);
  49                         dp_del_switch_port(p);
  50                         return NOTIFY_DONE;
  51                         break;
  52         }
  53         spin_unlock_irqrestore(&p->lock, flags);
  54
  55         if (orig_status != p->status)
  56                 dp_send_port_status(p, OFPPR_MOD);
  57
  58         return NOTIFY_DONE;
  59 }
  60
  61 struct notifier_block dp_device_notifier = {
  62         .notifier_call = dp_device_event
  63 };