net/openvswitch/dp_notify.c

   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 #include <net/netns/generic.h>
  22
  23 #include "datapath.h"
  24 #include "vport-internal_dev.h"
  25 #include "vport-netdev.h"
  26
  27 static void dp_detach_port_notify(struct vport *vport)
  28 {
  29         struct sk_buff *notify;
  30         struct datapath *dp;
  31
  32         dp = vport->dp;
  33         notify = ovs_vport_cmd_build_info(vport, 0, 0,
  34                                           OVS_VPORT_CMD_DEL);
  35         ovs_dp_detach_port(vport);
  36         if (IS_ERR(notify)) {
  37                 netlink_set_err(ovs_dp_get_net(dp)->genl_sock, 0,
  38                                 ovs_dp_vport_multicast_group.id,
  39                                 PTR_ERR(notify));
  40                 return;
  41         }
  42
  43         genlmsg_multicast_netns(ovs_dp_get_net(dp), notify, 0,
  44                                 ovs_dp_vport_multicast_group.id,
  45                                 GFP_KERNEL);
  46 }
  47
  48 void ovs_dp_notify_wq(struct work_struct *work)
  49 {
  50         struct ovs_net *ovs_net = container_of(work, struct ovs_net, dp_notify_work);
  51         struct datapath *dp;
  52
  53         ovs_lock();
  54         list_for_each_entry(dp, &ovs_net->dps, list_node) {
  55                 int i;
  56
  57                 for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
  58                         struct vport *vport;
  59                         struct hlist_node *n;
  60
  61                         hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node) {
  62                                 struct netdev_vport *netdev_vport;
  63
  64                                 if (vport->ops->type != OVS_VPORT_TYPE_NETDEV)
  65                                         continue;
  66
  67                                 netdev_vport = netdev_vport_priv(vport);
  68                                 if (netdev_vport->dev->reg_state == NETREG_UNREGISTERED ||
  69                                     netdev_vport->dev->reg_state == NETREG_UNREGISTERING)
  70                                         dp_detach_port_notify(vport);
  71                         }
  72                 }
  73         }
  74         ovs_unlock();
  75 }
  76
  77 static int dp_device_event(struct notifier_block *unused, unsigned long event,
  78                            void *ptr)
  79 {
  80         struct ovs_net *ovs_net;
  81         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
  82         struct vport *vport = NULL;
  83
  84         if (!ovs_is_internal_dev(dev))
  85                 vport = ovs_netdev_get_vport(dev);
  86
  87         if (!vport)
  88                 return NOTIFY_DONE;
  89
  90         if (event == NETDEV_UNREGISTER) {
  91                 ovs_net = net_generic(dev_net(dev), ovs_net_id);
  92                 queue_work(system_wq, &ovs_net->dp_notify_work);
  93         }
  94
  95         return NOTIFY_DONE;
  96 }
  97
  98 struct notifier_block ovs_dp_device_notifier = {
  99         .notifier_call = dp_device_event
 100 };