v4.19.13 snapshot.
diff --git a/net/openvswitch/vport-gre.c b/net/openvswitch/vport-gre.c
new file mode 100644
index 0000000..0e72d95
--- /dev/null
+++ b/net/openvswitch/vport-gre.c
@@ -0,0 +1,116 @@
+/*
+ * Copyright (c) 2007-2014 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
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/if.h>
+#include <linux/skbuff.h>
+#include <linux/ip.h>
+#include <linux/if_tunnel.h>
+#include <linux/if_vlan.h>
+#include <linux/in.h>
+#include <linux/in_route.h>
+#include <linux/inetdevice.h>
+#include <linux/jhash.h>
+#include <linux/list.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/workqueue.h>
+#include <linux/rculist.h>
+#include <net/route.h>
+#include <net/xfrm.h>
+
+#include <net/icmp.h>
+#include <net/ip.h>
+#include <net/ip_tunnels.h>
+#include <net/gre.h>
+#include <net/net_namespace.h>
+#include <net/netns/generic.h>
+#include <net/protocol.h>
+
+#include "datapath.h"
+#include "vport.h"
+#include "vport-netdev.h"
+
+static struct vport_ops ovs_gre_vport_ops;
+
+static struct vport *gre_tnl_create(const struct vport_parms *parms)
+{
+ struct net *net = ovs_dp_get_net(parms->dp);
+ struct net_device *dev;
+ struct vport *vport;
+ int err;
+
+ vport = ovs_vport_alloc(0, &ovs_gre_vport_ops, parms);
+ if (IS_ERR(vport))
+ return vport;
+
+ rtnl_lock();
+ dev = gretap_fb_dev_create(net, parms->name, NET_NAME_USER);
+ if (IS_ERR(dev)) {
+ rtnl_unlock();
+ ovs_vport_free(vport);
+ return ERR_CAST(dev);
+ }
+
+ err = dev_change_flags(dev, dev->flags | IFF_UP);
+ if (err < 0) {
+ rtnl_delete_link(dev);
+ rtnl_unlock();
+ ovs_vport_free(vport);
+ return ERR_PTR(err);
+ }
+
+ rtnl_unlock();
+ return vport;
+}
+
+static struct vport *gre_create(const struct vport_parms *parms)
+{
+ struct vport *vport;
+
+ vport = gre_tnl_create(parms);
+ if (IS_ERR(vport))
+ return vport;
+
+ return ovs_netdev_link(vport, parms->name);
+}
+
+static struct vport_ops ovs_gre_vport_ops = {
+ .type = OVS_VPORT_TYPE_GRE,
+ .create = gre_create,
+ .send = dev_queue_xmit,
+ .destroy = ovs_netdev_tunnel_destroy,
+};
+
+static int __init ovs_gre_tnl_init(void)
+{
+ return ovs_vport_ops_register(&ovs_gre_vport_ops);
+}
+
+static void __exit ovs_gre_tnl_exit(void)
+{
+ ovs_vport_ops_unregister(&ovs_gre_vport_ops);
+}
+
+module_init(ovs_gre_tnl_init);
+module_exit(ovs_gre_tnl_exit);
+
+MODULE_DESCRIPTION("OVS: GRE switching port");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("vport-type-3");