From: Ido Schimmel <idosch@mellanox.com>
Date: Wed, 17 Oct 2018 08:53:20 +0000
Subject: net: Add netif_is_vxlan()
Patch-mainline: v4.20-rc1
Git-commit: 5ff4ff4fe8c4e7d0de1d837e489056f0c470667b
References: bsc#1109837

Add the ability to determine whether a netdev is a VxLAN netdev by
calling the above mentioned function that checks the netdev's
rtnl_link_ops.

This will allow modules to identify netdev events involving a VxLAN
netdev and act accordingly. For example, drivers capable of VxLAN
offload will need to configure the underlying device when a VxLAN netdev
is being enslaved to an offloaded bridge.

Convert nfp to use the newly introduced helper.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Reviewed-by: Petr Machata <petrm@mellanox.com>
Acked-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/netronome/nfp/flower/tunnel_conf.c |    3 ++-
 include/net/vxlan.h                                     |    8 +++++++-
 2 files changed, 9 insertions(+), 2 deletions(-)

--- a/drivers/net/ethernet/netronome/nfp/flower/tunnel_conf.c
+++ b/drivers/net/ethernet/netronome/nfp/flower/tunnel_conf.c
@@ -4,6 +4,7 @@
 #include <linux/etherdevice.h>
 #include <linux/inetdevice.h>
 #include <net/netevent.h>
+#include <net/vxlan.h>
 #include <linux/idr.h>
 #include <net/dst_metadata.h>
 #include <net/arp.h>
@@ -187,7 +188,7 @@ static bool nfp_tun_is_netdev_to_offload
 		return false;
 	if (!strcmp(netdev->rtnl_link_ops->kind, "openvswitch"))
 		return true;
-	if (!strcmp(netdev->rtnl_link_ops->kind, "vxlan"))
+	if (netif_is_vxlan(netdev))
 		return true;
 
 	return false;
--- a/include/net/vxlan.h
+++ b/include/net/vxlan.h
@@ -4,7 +4,7 @@
 #include <linux/if_vlan.h>
 #include <net/udp_tunnel.h>
 #include <net/dst_metadata.h>
-#include <net/udp_tunnel.h>
+#include <net/rtnetlink.h>
 
 /* VXLAN protocol (RFC 7348) header:
  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
@@ -407,4 +407,10 @@ static inline bool vxlan_addr_multicast(
 
 #endif /* IS_ENABLED(CONFIG_IPV6) */
 
+static inline bool netif_is_vxlan(const struct net_device *dev)
+{
+	return dev->rtnl_link_ops &&
+	       !strcmp(dev->rtnl_link_ops->kind, "vxlan");
+}
+
 #endif