datapath/dp_notify.c

   1 /*
   2  * Copyright (c) 2007-2011 Nicira Networks.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of version 2 of the GNU General Public
   6  * License as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program; if not, write to the Free Software
  15  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  16  * 02110-1301, USA
  17  */
  18
  19 #include <linux/netdevice.h>
  20 #include <net/genetlink.h>
  21
  22 #include "datapath.h"
  23 #include "vport-internal_dev.h"
  24 #include "vport-netdev.h"
  25
  26 static int dp_device_event(struct notifier_block *unused, unsigned long event,
  27                 void *ptr)
  28 {
  29         struct net_device *dev = ptr;
  30         struct vport *vport;
  31         struct datapath *dp;
  32
  33         if (is_internal_dev(dev))
  34                 vport = internal_dev_get_vport(dev);
  35         else
  36                 vport = netdev_get_vport(dev);
  37
  38         if (!vport)
  39                 return NOTIFY_DONE;
  40
  41         dp = vport->dp;
  42
  43         switch (event) {
  44         case NETDEV_UNREGISTER:
  45                 if (!is_internal_dev(dev)) {
  46                         struct sk_buff *notify;
  47
  48                         notify = ovs_vport_cmd_build_info(vport, 0, 0,
  49                                                           OVS_VPORT_CMD_DEL);
  50                         dp_detach_port(vport);
  51                         if (IS_ERR(notify)) {
  52                                 netlink_set_err(INIT_NET_GENL_SOCK, 0,
  53                                                 dp_vport_multicast_group.id,
  54                                                 PTR_ERR(notify));
  55                                 break;
  56                         }
  57
  58                         genlmsg_multicast(notify, 0, dp_vport_multicast_group.id,
  59                                           GFP_KERNEL);
  60                 }
  61                 break;
  62
  63         case NETDEV_CHANGENAME:
  64                 if (vport->port_no != OVSP_LOCAL) {
  65                         dp_sysfs_del_if(vport);
  66                         dp_sysfs_add_if(vport);
  67                 }
  68                 break;
  69         }
  70         return NOTIFY_DONE;
  71 }
  72
  73 struct notifier_block dp_device_notifier = {
  74         .notifier_call = dp_device_event
  75 };