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