net/openvswitch/dp_notify.c

   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
  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
  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
  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 };