datapath/dp_notify.c

   1 /*
   2  * Distributed under the terms of the GNU GPL version 2.
   3  * Copyright (c) 2007, 2008, 2009, 2010, 2011 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 #include <net/genetlink.h>
  13
  14 #include "datapath.h"
  15 #include "vport-internal_dev.h"
  16 #include "vport-netdev.h"
  17
  18 static int dp_device_event(struct notifier_block *unused, unsigned long event,
  19                 void *ptr)
  20 {
  21         struct net_device *dev = ptr;
  22         struct vport *vport;
  23         struct datapath *dp;
  24
  25         if (is_internal_dev(dev))
  26                 vport = internal_dev_get_vport(dev);
  27         else
  28                 vport = netdev_get_vport(dev);
  29
  30         if (!vport)
  31                 return NOTIFY_DONE;
  32
  33         dp = vport->dp;
  34
  35         switch (event) {
  36         case NETDEV_UNREGISTER:
  37                 if (!is_internal_dev(dev)) {
  38                         struct sk_buff *reply;
  39
  40                         dp_detach_port(vport);
  41                         reply = ovs_vport_cmd_build_info(vport, 0, 0,
  42                                                          OVS_VPORT_CMD_DEL);
  43                         if (IS_ERR(reply)) {
  44                                 netlink_set_err(INIT_NET_GENL_SOCK, 0,
  45                                                 dp_vport_multicast_group.id,
  46                                                 PTR_ERR(reply));
  47                                 break;
  48                         }
  49
  50                         genl_notify(reply, dev_net(dev), 0,
  51                                     dp_vport_multicast_group.id, NULL,
  52                                     GFP_KERNEL);
  53                 }
  54                 break;
  55
  56         case NETDEV_CHANGENAME:
  57                 if (vport->port_no != OVSP_LOCAL) {
  58                         dp_sysfs_del_if(vport);
  59                         dp_sysfs_add_if(vport);
  60                 }
  61                 break;
  62         }
  63         return NOTIFY_DONE;
  64 }
  65
  66 struct notifier_block dp_device_notifier = {
  67         .notifier_call = dp_device_event
  68 };