xref: /openbmc/linux/net/openvswitch/dp_notify.c (revision 44e37259)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (c) 2007-2012 Nicira, Inc.
4  */
5 
6 #include <linux/netdevice.h>
7 #include <net/genetlink.h>
8 #include <net/netns/generic.h>
9 
10 #include "datapath.h"
11 #include "vport-internal_dev.h"
12 #include "vport-netdev.h"
13 
dp_detach_port_notify(struct vport * vport)14 static void dp_detach_port_notify(struct vport *vport)
15 {
16 	struct sk_buff *notify;
17 	struct datapath *dp;
18 
19 	dp = vport->dp;
20 	notify = ovs_vport_cmd_build_info(vport, ovs_dp_get_net(dp),
21 					  0, 0, OVS_VPORT_CMD_DEL);
22 	ovs_dp_detach_port(vport);
23 	if (IS_ERR(notify)) {
24 		genl_set_err(&dp_vport_genl_family, ovs_dp_get_net(dp), 0,
25 			     0, PTR_ERR(notify));
26 		return;
27 	}
28 
29 	genlmsg_multicast_netns(&dp_vport_genl_family,
30 				ovs_dp_get_net(dp), notify, 0,
31 				0, GFP_KERNEL);
32 }
33 
ovs_dp_notify_wq(struct work_struct * work)34 void ovs_dp_notify_wq(struct work_struct *work)
35 {
36 	struct ovs_net *ovs_net = container_of(work, struct ovs_net, dp_notify_work);
37 	struct datapath *dp;
38 
39 	ovs_lock();
40 	list_for_each_entry(dp, &ovs_net->dps, list_node) {
41 		int i;
42 
43 		for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
44 			struct vport *vport;
45 			struct hlist_node *n;
46 
47 			hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node) {
48 				if (vport->ops->type == OVS_VPORT_TYPE_INTERNAL)
49 					continue;
50 
51 				if (!(netif_is_ovs_port(vport->dev)))
52 					dp_detach_port_notify(vport);
53 			}
54 		}
55 	}
56 	ovs_unlock();
57 }
58 
dp_device_event(struct notifier_block * unused,unsigned long event,void * ptr)59 static int dp_device_event(struct notifier_block *unused, unsigned long event,
60 			   void *ptr)
61 {
62 	struct ovs_net *ovs_net;
63 	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
64 	struct vport *vport = NULL;
65 
66 	if (!ovs_is_internal_dev(dev))
67 		vport = ovs_netdev_get_vport(dev);
68 
69 	if (!vport)
70 		return NOTIFY_DONE;
71 
72 	if (event == NETDEV_UNREGISTER) {
73 		/* upper_dev_unlink and decrement promisc immediately */
74 		ovs_netdev_detach_dev(vport);
75 
76 		/* schedule vport destroy, dev_put and genl notification */
77 		ovs_net = net_generic(dev_net(dev), ovs_net_id);
78 		queue_work(system_wq, &ovs_net->dp_notify_work);
79 	}
80 
81 	return NOTIFY_DONE;
82 }
83 
84 struct notifier_block ovs_dp_device_notifier = {
85 	.notifier_call = dp_device_event
86 };
87