[RFC net-next 5/6] net: gre: remove unused gretap_fb_dev_create

[Ilya Maximets]

The only user was vport-gre in openvswitch and now it is gone.

Note: since it's an exported symbol, there is a possibility that some
out-of-tree module is using it.  So, alternative is to deprecate it
instead by adding a warning if it is ever called.

Signed-off-by: Ilya Maximets <i.maxim...@ovn.org>
---
 include/net/gre.h |  2 --
 net/ipv4/ip_gre.c | 47 -----------------------------------------------
 2 files changed, 49 deletions(-)

diff --git a/include/net/gre.h b/include/net/gre.h
index ccd2932032844..b55f67ecd2fc4 100644
--- a/include/net/gre.h
+++ b/include/net/gre.h
@@ -32,8 +32,6 @@ struct gre_protocol {
 int gre_add_protocol(const struct gre_protocol *proto, u8 version);
 int gre_del_protocol(const struct gre_protocol *proto, u8 version);
 
-struct net_device *gretap_fb_dev_create(struct net *net, const char *name,
-                                      u8 name_assign_type);
 int gre_parse_header(struct sk_buff *skb, struct tnl_ptk_info *tpi,
                     bool *csum_err, __be16 proto, int nhs);
 
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 169e2921a851d..a1dd833ea1cad 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -1710,53 +1710,6 @@ static struct rtnl_link_ops erspan_link_ops 
__read_mostly = {
        .get_link_net   = ip_tunnel_get_link_net,
 };
 
-struct net_device *gretap_fb_dev_create(struct net *net, const char *name,
-                                       u8 name_assign_type)
-{
-       struct rtnl_newlink_params params = { .src_net = net };
-       struct nlattr *tb[IFLA_MAX + 1];
-       struct net_device *dev;
-       LIST_HEAD(list_kill);
-       struct ip_tunnel *t;
-       int err;
-
-       memset(&tb, 0, sizeof(tb));
-       params.tb = tb;
-
-       dev = rtnl_create_link(net, name, name_assign_type,
-                              &ipgre_tap_ops, tb, NULL);
-       if (IS_ERR(dev))
-               return dev;
-
-       /* Configure flow based GRE device. */
-       t = netdev_priv(dev);
-       t->collect_md = true;
-
-       err = ipgre_newlink(dev, &params, NULL);
-       if (err < 0) {
-               free_netdev(dev);
-               return ERR_PTR(err);
-       }
-
-       /* openvswitch users expect packet sizes to be unrestricted,
-        * so set the largest MTU we can.
-        */
-       err = __ip_tunnel_change_mtu(dev, IP_MAX_MTU, false);
-       if (err)
-               goto out;
-
-       err = rtnl_configure_link(dev, NULL, 0, NULL);
-       if (err < 0)
-               goto out;
-
-       return dev;
-out:
-       ip_tunnel_dellink(dev, &list_kill);
-       unregister_netdevice_many(&list_kill);
-       return ERR_PTR(err);
-}
-EXPORT_SYMBOL_GPL(gretap_fb_dev_create);
-
 static int __net_init ipgre_tap_init_net(struct net *net)
 {
        return ip_tunnel_init_net(net, gre_tap_net_id, &ipgre_tap_ops, 
"gretap0");
-- 
2.53.0