Commit 3f2d1d4c998c "[netdrv] replace dev->trans_start update with helper"
(upstream commit 860e9538a94) replaces all instances of d->trans_start =
jiffies with netif_trans_update(d). The function netif_trans_update() itself
introduced in previous commit, e1dc753ce4cd "[net] netdevice: add helper to
update trans_start" (upstream commit ba162f8eed61).

Backport change: introduce ixgbe_backport_compat.h, which includes
implementation of netif_trans_update() from "[net] netdevice: add helper to
update trans_start".
Index: src/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
===================================================================
--- src.orig/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c	2017-03-10 18:25:48.779989021 +0100
+++ src/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c	2017-03-13 01:57:10.544940341 +0100
@@ -58,6 +58,8 @@
 #include "ixgbe_dcb_82599.h"
 #include "ixgbe_sriov.h"
 
+#include "ixgbe_backport_compat.h"
+
 char ixgbe_driver_name[] = "ixgbe";
 static const char ixgbe_driver_string[] =
 			      "Intel(R) 10 Gigabit PCI Express Network Driver";
Index: src/drivers/net/ethernet/intel/ixgbe/ixgbe_backport_compat.h
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ src/drivers/net/ethernet/intel/ixgbe/ixgbe_backport_compat.h	2017-03-13 01:42:54.427092313 +0100
@@ -0,0 +1,12 @@
+#ifndef _RH_IXGBE_BACKPORT_COMPAT_H_
+#define _RH_IXGBE_BACKPORT_COMPAT_H_
+
+#include <linux/netdevice.h>
+
+/* legacy drivers only, netdev_start_xmit() sets txq->trans_start */
+static inline void netif_trans_update(struct net_device *dev)
+{
+	dev->trans_start = jiffies;
+}
+
+#endif /* #ifndef _RH_IXGBE_BACKPORT_COMPAT_H_ */