v4.19.13 snapshot.
diff --git a/net/openvswitch/dp_notify.c b/net/openvswitch/dp_notify.c
new file mode 100644
index 0000000..f3ee2f2
--- /dev/null
+++ b/net/openvswitch/dp_notify.c
@@ -0,0 +1,99 @@
+/*
+ * Copyright (c) 2007-2012 Nicira, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ */
+
+#include <linux/netdevice.h>
+#include <net/genetlink.h>
+#include <net/netns/generic.h>
+
+#include "datapath.h"
+#include "vport-internal_dev.h"
+#include "vport-netdev.h"
+
+static void dp_detach_port_notify(struct vport *vport)
+{
+ struct sk_buff *notify;
+ struct datapath *dp;
+
+ dp = vport->dp;
+ notify = ovs_vport_cmd_build_info(vport, ovs_dp_get_net(dp),
+ 0, 0, OVS_VPORT_CMD_DEL);
+ ovs_dp_detach_port(vport);
+ if (IS_ERR(notify)) {
+ genl_set_err(&dp_vport_genl_family, ovs_dp_get_net(dp), 0,
+ 0, PTR_ERR(notify));
+ return;
+ }
+
+ genlmsg_multicast_netns(&dp_vport_genl_family,
+ ovs_dp_get_net(dp), notify, 0,
+ 0, GFP_KERNEL);
+}
+
+void ovs_dp_notify_wq(struct work_struct *work)
+{
+ struct ovs_net *ovs_net = container_of(work, struct ovs_net, dp_notify_work);
+ struct datapath *dp;
+
+ ovs_lock();
+ list_for_each_entry(dp, &ovs_net->dps, list_node) {
+ int i;
+
+ for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
+ struct vport *vport;
+ struct hlist_node *n;
+
+ hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node) {
+ if (vport->ops->type == OVS_VPORT_TYPE_INTERNAL)
+ continue;
+
+ if (!(vport->dev->priv_flags & IFF_OVS_DATAPATH))
+ dp_detach_port_notify(vport);
+ }
+ }
+ }
+ ovs_unlock();
+}
+
+static int dp_device_event(struct notifier_block *unused, unsigned long event,
+ void *ptr)
+{
+ struct ovs_net *ovs_net;
+ struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+ struct vport *vport = NULL;
+
+ if (!ovs_is_internal_dev(dev))
+ vport = ovs_netdev_get_vport(dev);
+
+ if (!vport)
+ return NOTIFY_DONE;
+
+ if (event == NETDEV_UNREGISTER) {
+ /* upper_dev_unlink and decrement promisc immediately */
+ ovs_netdev_detach_dev(vport);
+
+ /* schedule vport destroy, dev_put and genl notification */
+ ovs_net = net_generic(dev_net(dev), ovs_net_id);
+ queue_work(system_wq, &ovs_net->dp_notify_work);
+ }
+
+ return NOTIFY_DONE;
+}
+
+struct notifier_block ovs_dp_device_notifier = {
+ .notifier_call = dp_device_event
+};