linux/net/openvswitch/dp_notify.c
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   1/*
   2 * Copyright (c) 2007-2012 Nicira, Inc.
   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
  26static 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
  32        if (ovs_is_internal_dev(dev))
  33                vport = ovs_internal_dev_get_vport(dev);
  34        else
  35                vport = ovs_netdev_get_vport(dev);
  36
  37        if (!vport)
  38                return NOTIFY_DONE;
  39
  40        switch (event) {
  41        case NETDEV_UNREGISTER:
  42                if (!ovs_is_internal_dev(dev)) {
  43                        struct sk_buff *notify;
  44
  45                        notify = ovs_vport_cmd_build_info(vport, 0, 0,
  46                                                          OVS_VPORT_CMD_DEL);
  47                        ovs_dp_detach_port(vport);
  48                        if (IS_ERR(notify)) {
  49                                netlink_set_err(init_net.genl_sock, 0,
  50                                                ovs_dp_vport_multicast_group.id,
  51                                                PTR_ERR(notify));
  52                                break;
  53                        }
  54
  55                        genlmsg_multicast(notify, 0, ovs_dp_vport_multicast_group.id,
  56                                          GFP_KERNEL);
  57                }
  58                break;
  59        }
  60
  61        return NOTIFY_DONE;
  62}
  63
  64struct notifier_block ovs_dp_device_notifier = {
  65        .notifier_call = dp_device_event
  66};
  67
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