diff --git a/sys/ofed/include/linux/delay.h b/sys/ofed/include/linux/delay.h
index ac9e46de3419..418188d12f9b 100644
--- a/sys/ofed/include/linux/delay.h
+++ b/sys/ofed/include/linux/delay.h
@@ -2,7 +2,8 @@
  * Copyright (c) 2010 Isilon Systems, Inc.
  * Copyright (c) 2010 iX Systems, Inc.
  * Copyright (c) 2010 Panasas, Inc.
- * Copyright (c) 2013, 2014 Mellanox Technologies, Ltd.
+ * Copyright (c) 2013-2015 Mellanox Technologies, Ltd.
+ * Copyright (c) 2014 François Tigeot
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -31,6 +32,7 @@
 #define	_LINUX_DELAY_H_
 
 #include <linux/jiffies.h>
+#include <sys/systm.h>
 
 static inline void
 linux_msleep(int ms)
@@ -41,4 +43,25 @@ linux_msleep(int ms)
 #undef msleep
 #define	msleep	linux_msleep
 
+#define	udelay(t)	DELAY(t)
+
+static inline void
+mdelay(unsigned long msecs)
+{
+	while (msecs--)
+		DELAY(1000);
+}
+
+static inline void
+ndelay(unsigned long x)
+{
+	DELAY(howmany(x, 1000));
+}
+
+static inline void
+usleep_range(unsigned long min, unsigned long max)
+{
+	DELAY(min);
+}
+
 #endif	/* _LINUX_DELAY_H_ */
diff --git a/sys/ofed/include/linux/kernel.h b/sys/ofed/include/linux/kernel.h
index f205e20f8bed..d8608b286330 100644
--- a/sys/ofed/include/linux/kernel.h
+++ b/sys/ofed/include/linux/kernel.h
@@ -2,7 +2,8 @@
  * Copyright (c) 2010 Isilon Systems, Inc.
  * Copyright (c) 2010 iX Systems, Inc.
  * Copyright (c) 2010 Panasas, Inc.
- * Copyright (c) 2013, 2014 Mellanox Technologies, Ltd.
+ * Copyright (c) 2013-2015 Mellanox Technologies, Ltd.
+ * Copyright (c) 2014-2015 François Tigeot
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -69,7 +70,8 @@
 #define	ALIGN(x, y)		roundup2((x), (y))
 #undef PTR_ALIGN
 #define	PTR_ALIGN(p, a)		((__typeof(p))ALIGN((uintptr_t)(p), (a)))
-#define	DIV_ROUND_UP		howmany
+#define	DIV_ROUND_UP(x, n)	howmany(x, n)
+#define	DIV_ROUND_UP_ULL(x, n)	DIV_ROUND_UP((unsigned long long)(x), (n))
 #define	FIELD_SIZEOF(t, f)	sizeof(((t *)0)->f)
 
 #define	printk(X...)		printf(X)
@@ -90,9 +92,6 @@
 	({ if (0) log(LOG_DEBUG, pr_fmt(fmt), ##__VA_ARGS__); 0; })
 #endif
 
-#define udelay(t)       	DELAY(t)
-#define usleep_range(min,max)	DELAY(min)
-
 #ifndef pr_fmt
 #define pr_fmt(fmt) fmt
 #endif
@@ -164,9 +163,16 @@
 
 #define min(x, y)	((x) < (y) ? (x) : (y))
 #define max(x, y)	((x) > (y) ? (x) : (y))
+
+#define min3(a, b, c)	min(a, min(b,c))
+#define max3(a, b, c)	max(a, max(b,c))
+
 #define min_t(type, _x, _y)	((type)(_x) < (type)(_y) ? (type)(_x) : (type)(_y))
 #define max_t(type, _x, _y)	((type)(_x) > (type)(_y) ? (type)(_x) : (type)(_y))
 
+#define clamp_t(type, _x, min, max)	min_t(type, max_t(type, _x, min), max)
+#define clamp(x, lo, hi)		min( max(x,lo), hi)
+
 /*
  * This looks more complex than it should be. But we need to
  * get the type for the ~ right in round_down (it needs to be
@@ -184,4 +190,28 @@ typedef struct pm_message {
         int event;
 } pm_message_t;
 
+/* Swap values of a and b */
+#define swap(a, b) do {			\
+	typeof(a) _swap_tmp = a;	\
+	a = b;				\
+	b = _swap_tmp;			\
+} while (0)
+
+#define	DIV_ROUND_CLOSEST(x, divisor)	(((x) + ((divisor) / 2)) / (divisor))
+
+static inline uintmax_t
+mult_frac(uintmax_t x, uintmax_t multiplier, uintmax_t divisor)
+{
+	uintmax_t q = (x / divisor);
+	uintmax_t r = (x % divisor);
+
+	return ((q * multiplier) + ((r * multiplier) / divisor));
+}
+
+static inline int64_t
+abs64(int64_t x)
+{
+	return (x < 0 ? -x : x);
+}
+
 #endif	/* _LINUX_KERNEL_H_ */