Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
[sfrench/cifs-2.6.git] / 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                                 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->priv_flags & IFF_OVS_DATAPATH))
68                                         dp_detach_port_notify(vport);
69                         }
70                 }
71         }
72         ovs_unlock();
73 }
74
75 static int dp_device_event(struct notifier_block *unused, unsigned long event,
76                            void *ptr)
77 {
78         struct ovs_net *ovs_net;
79         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
80         struct vport *vport = NULL;
81
82         if (!ovs_is_internal_dev(dev))
83                 vport = ovs_netdev_get_vport(dev);
84
85         if (!vport)
86                 return NOTIFY_DONE;
87
88         if (event == NETDEV_UNREGISTER) {
89                 /* upper_dev_unlink and decrement promisc immediately */
90                 ovs_netdev_detach_dev(vport);
91
92                 /* schedule vport destroy, dev_put and genl notification */
93                 ovs_net = net_generic(dev_net(dev), ovs_net_id);
94                 queue_work(system_wq, &ovs_net->dp_notify_work);
95         }
96
97         return NOTIFY_DONE;
98 }
99
100 struct notifier_block ovs_dp_device_notifier = {
101         .notifier_call = dp_device_event
102 };