From ed862c33553393b972e9944ffec5292fde723ed3 Mon Sep 17 00:00:00 2001
From: "Jingliang(Dan) Jiang" <jjingliang@fortinet.com>
Date: Wed, 19 Mar 2025 15:25:46 -0700
Subject: [PATCH] Fix build error on kernel 4.19.x

---
 src/ixgbe_ethtool.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/ixgbe_ethtool.c b/src/ixgbe_ethtool.c
index e983035..a506e33 100644
--- a/src/ixgbe_ethtool.c
+++ b/src/ixgbe_ethtool.c
@@ -10,7 +10,15 @@
 #include <linux/ethtool.h>
 #include <linux/vmalloc.h>
 #include <linux/highmem.h>
+#include <linux/version.h>
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(5,0,0)
+static inline void linkmode_and(unsigned long *dst, const unsigned long *a,
+	const unsigned long *b)
+{
+    bitmap_and(dst, a, b, __ETHTOOL_LINK_MODE_MASK_NBITS);
+}
+#endif
 
 #ifdef SIOCETHTOOL
 #include <asm/uaccess.h>