[ovs-dev,1/2] gre: Remove dead ipgre code

Open vSwitch uses gretap, not ipgre for gre tunneling.  Remove dead
code for ipgre type tunnels.

Signed-off-by: Greg Rose <gvrose8192@gmail.com>
---
 datapath/linux/compat/ip_gre.c | 65 ++----------------------------------------
 1 file changed, 2 insertions(+), 63 deletions(-)

On Tue, Nov 6, 2018 at 2:24 PM Greg Rose <gvrose8192@gmail.com> wrote:
>
> Open vSwitch uses gretap, not ipgre for gre tunneling.  Remove dead
> code for ipgre type tunnels.
>
> Signed-off-by: Greg Rose <gvrose8192@gmail.com>
> ---

LGTM.
Acked-by: William Tu <u9012063@gmail.com>

>  datapath/linux/compat/ip_gre.c | 65 ++----------------------------------------
>  1 file changed, 2 insertions(+), 63 deletions(-)
>
> diff --git a/datapath/linux/compat/ip_gre.c b/datapath/linux/compat/ip_gre.c
> index 6ac2dd9..0faf8ab 100644
> --- a/datapath/linux/compat/ip_gre.c
> +++ b/datapath/linux/compat/ip_gre.c
> @@ -64,13 +64,11 @@
>  #include "vport-netdev.h"
>
>  static int gre_tap_net_id __read_mostly;
> -static int ipgre_net_id __read_mostly;
>  static unsigned int erspan_net_id __read_mostly;
>  static void erspan_build_header(struct sk_buff *skb,
>                                 __be32 id, u32 index,
>                                 bool truncate, bool is_ipv4);
>
> -static struct rtnl_link_ops ipgre_link_ops __read_mostly;
>  static bool ip_gre_loaded = false;
>
>  #define ip_gre_calc_hlen rpl_ip_gre_calc_hlen
> @@ -316,16 +314,10 @@ static int ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi,
>                  tpi->proto == htons(ETH_P_ERSPAN2))
>                 itn = net_generic(net, erspan_net_id);
>         else
> -               itn = net_generic(net, ipgre_net_id);
> +               return PACKET_RCVD;
>
>         res = __ipgre_rcv(skb, tpi, itn, hdr_len, false);
> -       if (res == PACKET_NEXT && tpi->proto == htons(ETH_P_TEB)) {
> -               /* ipgre tunnels in collect metadata mode should receive
> -                * also ETH_P_TEB traffic.
> -                */
> -               itn = net_generic(net, ipgre_net_id);
> -               res = __ipgre_rcv(skb, tpi, itn, hdr_len, true);
> -       }
> +
>         return res;
>  }
>
> @@ -727,25 +719,6 @@ static const struct gre_protocol ipgre_protocol = {
>         .err_handler = __gre_err,
>  };
>
> -static int __net_init ipgre_init_net(struct net *net)
> -{
> -       return ip_tunnel_init_net(net, ipgre_net_id, &ipgre_link_ops, NULL);
> -}
> -
> -static void __net_exit ipgre_exit_net(struct net *net)
> -{
> -       struct ip_tunnel_net *itn = net_generic(net, ipgre_net_id);
> -
> -       ip_tunnel_delete_net(itn, &ipgre_link_ops);
> -}
> -
> -static struct pernet_operations ipgre_net_ops = {
> -       .init = ipgre_init_net,
> -       .exit = ipgre_exit_net,
> -       .id   = &ipgre_net_id,
> -       .size = sizeof(struct ip_tunnel_net),
> -};
> -
>  #ifdef HAVE_EXT_ACK_IN_RTNL_LINKOPS
>  static int ipgre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
>                                  struct netlink_ext_ack *extack)
> @@ -1205,13 +1178,6 @@ static const struct net_device_ops erspan_netdev_ops = {
>  #endif
>  };
>
> -static void ipgre_tunnel_setup(struct net_device *dev)
> -{
> -       dev->netdev_ops         = &ipgre_netdev_ops;
> -       dev->type               = ARPHRD_IPGRE;
> -       ip_tunnel_setup(dev, ipgre_net_id);
> -}
> -
>  static void ipgre_tap_setup(struct net_device *dev)
>  {
>         ether_setup(dev);
> @@ -1352,22 +1318,6 @@ static const struct nla_policy ipgre_policy[RPL_IFLA_GRE_MAX + 1] = {
>         [IFLA_GRE_ERSPAN_HWID]  = { .type = NLA_U16 },
>  };
>
> -static struct rtnl_link_ops ipgre_link_ops __read_mostly = {
> -       .kind           = "gre",
> -       .maxtype        = RPL_IFLA_GRE_MAX,
> -       .policy         = ipgre_policy,
> -       .priv_size      = sizeof(struct ip_tunnel),
> -       .setup          = ipgre_tunnel_setup,
> -       .validate       = ipgre_tunnel_validate,
> -       .newlink        = ipgre_newlink,
> -       .dellink        = ip_tunnel_dellink,
> -       .get_size       = ipgre_get_size,
> -       .fill_info      = ipgre_fill_info,
> -#ifdef HAVE_GET_LINK_NET
> -       .get_link_net   = ip_tunnel_get_link_net,
> -#endif
> -};
> -
>  static struct rtnl_link_ops ipgre_tap_ops __read_mostly = {
>         .kind           = "ovs_gretap",
>         .maxtype        = RPL_IFLA_GRE_MAX,
> @@ -1655,14 +1605,6 @@ int rpl_ipgre_init(void)
>                         goto pnet_erspan_failed;
>         }
>
> -       err = register_pernet_device(&ipgre_net_ops);
> -       if (err < 0) {
> -               if (err == -EEXIST)
> -                       goto ip_gre_loaded;
> -               else
> -                       goto pnet_ipgre_failed;
> -       }
> -
>         err = gre_add_protocol(&ipgre_protocol, GREPROTO_CISCO);
>         if (err < 0) {
>                 pr_info("%s: can't add protocol\n", __func__);
> @@ -1696,8 +1638,6 @@ ip_gre_loaded:
>         return 0;
>
>  add_proto_failed:
> -       unregister_pernet_device(&ipgre_net_ops);
> -pnet_ipgre_failed:
>         unregister_pernet_device(&erspan_net_ops);
>  pnet_erspan_failed:
>         unregister_pernet_device(&ipgre_tap_net_ops);
> @@ -1713,7 +1653,6 @@ void rpl_ipgre_fini(void)
>
>         if (!ip_gre_loaded) {
>                 gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO);
> -               unregister_pernet_device(&ipgre_net_ops);
>                 unregister_pernet_device(&erspan_net_ops);
>                 unregister_pernet_device(&ipgre_tap_net_ops);
>         }
> --
> 1.8.3.1
>