diff --git a/sys/compat/linuxkpi/common/include/linux/math64.h b/sys/compat/linuxkpi/common/include/linux/math64.h
index da8b19d37efe..f708f1ae81fa 100644
--- a/sys/compat/linuxkpi/common/include/linux/math64.h
+++ b/sys/compat/linuxkpi/common/include/linux/math64.h
@@ -1,103 +1,122 @@
 /*-
  * Copyright (c) 2007 Cisco Systems, Inc.  All rights reserved.
  * Copyright (c) 2014-2015 Mellanox Technologies, Ltd. All rights reserved.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice unmodified, this list of conditions, and the following
  *    disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  * $FreeBSD$
  */
 
 #ifndef _LINUXKPI_LINUX_MATH64_H
 #define	_LINUXKPI_LINUX_MATH64_H
 
 #include <sys/stdint.h>
 
 #define	do_div(n, base) ({			\
 	uint32_t __base = (base);		\
 	uint32_t __rem;				\
 	__rem = ((uint64_t)(n)) % __base;	\
 	(n) = ((uint64_t)(n)) / __base;		\
 	__rem;					\
 })
 
 static inline uint64_t
 div64_u64_rem(uint64_t dividend, uint64_t divisor, uint64_t *remainder)
 {
 
 	*remainder = dividend % divisor;
 	return (dividend / divisor);
 }
 
 static inline int64_t
 div64_s64(int64_t dividend, int64_t divisor)
 {
 
 	return (dividend / divisor);
 }
 
 static inline uint64_t
 div64_u64(uint64_t dividend, uint64_t divisor)
 {
 
 	return (dividend / divisor);
 }
 
 static inline uint64_t
 div_u64_rem(uint64_t dividend, uint32_t divisor, uint32_t *remainder)
 {
 
 	*remainder = dividend % divisor;
 	return (dividend / divisor);
 }
 
 static inline int64_t
 div_s64(int64_t dividend, int32_t divisor)
 {
 
 	return (dividend / divisor);
 }
 
 static inline uint64_t
 div_u64(uint64_t dividend, uint32_t divisor)
 {
 
 	return (dividend / divisor);
 }
 
 static inline uint64_t
 mul_u32_u32(uint32_t a, uint32_t b)
 {
 
 	return ((uint64_t)a * b);
 }
 
 static inline uint64_t
 div64_u64_round_up(uint64_t dividend, uint64_t divisor)
 {
 	return ((dividend + divisor - 1) / divisor);
 }
 
 #define	DIV64_U64_ROUND_UP(...) \
 	div64_u64_round_up(__VA_ARGS__)
 
+static inline uint64_t
+mul_u64_u32_div(uint64_t x, uint32_t y, uint32_t div)
+{
+	const uint64_t rem = x % div;
+
+	return ((x / div) * y + (rem * y) / div);
+}
+
+static inline uint64_t
+mul_u64_u32_shr(uint64_t x, uint32_t y, unsigned int shift)
+{
+	uint32_t hi, lo;
+	hi = x >> 32;
+	lo = x & 0xffffffff;
+
+	return (mul_u32_u32(lo, y) >> shift) +
+		(mul_u32_u32(hi, y) << (32 - shift));
+}
+
 #endif /* _LINUXKPI_LINUX_MATH64_H */