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                 genl_set_err(&dp_vport_genl_family, ovs_dp_get_net(dp), 0,
  38                              0, PTR_ERR(notify));
  39                 return;
  40         }
  41
  42         genlmsg_multicast_netns(&dp_vport_genl_family,
  43                                 ovs_dp_get_net(dp), notify, 0,
  44                                 0, 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                                 if (vport->ops->type == OVS_VPORT_TYPE_INTERNAL)
  62                                         continue;
  63
  64                                 if (!(vport->dev->priv_flags & IFF_OVS_DATAPATH))
  65                                         dp_detach_port_notify(vport);
  66                         }
  67                 }
  68         }
  69         ovs_unlock();
  70 }
  71
  72 static int dp_device_event(struct notifier_block *unused, unsigned long event,
  73                            void *ptr)
  74 {
  75         struct ovs_net *ovs_net;
  76         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
  77         struct vport *vport = NULL;
  78
  79         if (!ovs_is_internal_dev(dev))
  80                 vport = ovs_netdev_get_vport(dev);
  81
  82         if (!vport)
  83                 return NOTIFY_DONE;
  84
  85         if (event == NETDEV_UNREGISTER) {
  86                 /* upper_dev_unlink and decrement promisc immediately */
  87                 ovs_netdev_detach_dev(vport);
  88
  89                 /* schedule vport destroy, dev_put and genl notification */
  90                 ovs_net = net_generic(dev_net(dev), ovs_net_id);
  91                 queue_work(system_wq, &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 };