From: Wojciech Drewek <wojciech.drewek@intel.com>
Date: Fri, 4 Mar 2022 17:40:46 +0100
Subject: gtp: Add support for checking GTP device type
Patch-mainline: v5.18-rc1
Git-commit: 81dd9849fa4911f76a14f354a048865894b9751e
References: jsc#PED-376

Add a function that checks if a net device type is GTP.

Signed-off-by: Wojciech Drewek <wojciech.drewek@intel.com>
Reviewed-by: Harald Welte <laforge@gnumonks.org>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 include/net/gtp.h |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/include/net/gtp.h
+++ b/include/net/gtp.h
@@ -63,6 +63,12 @@ struct gtp_pdu_session_info {	/* Accordi
 	u8	qfi;
 };
 
+static inline bool netif_is_gtp(const struct net_device *dev)
+{
+	return dev->rtnl_link_ops &&
+		!strcmp(dev->rtnl_link_ops->kind, "gtp");
+}
+
 #define GTP1_F_NPDU	0x01
 #define GTP1_F_SEQ	0x02
 #define GTP1_F_EXTHDR	0x04