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diff --git a/sys/compat/linuxkpi/common/include/linux/kfifo.h b/sys/compat/linuxkpi/common/include/linux/kfifo.h
--- a/sys/compat/linuxkpi/common/include/linux/kfifo.h
+++ b/sys/compat/linuxkpi/common/include/linux/kfifo.h
@@ -1,5 +1,6 @@
/*-
* Copyright (c) 2021 Beckhoff Automation GmbH & Co. KG
+ * Copyright (c) 2022 Bjoern A. Zeeb
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
@@ -27,7 +28,95 @@
#ifndef _LINUXKPI_LINUX_KFIFO_H_
#define _LINUXKPI_LINUX_KFIFO_H_
+#include <sys/types.h>
+
+#include <linux/slab.h>
+#include <linux/gfp.h>
+
#define INIT_KFIFO(x) 0
#define DECLARE_KFIFO(x, y, z)
+#define DECLARE_KFIFO_PTR(_name, _type) \
+ struct kfifo_ ## _name { \
+ size_t total; \
+ size_t count; \
+ size_t first; \
+ size_t last; \
+ _type *head; \
+ } _name
+
+#define kfifo_len(_kf) \
+({ \
+ (_kf)->count; \
+})
+
+#define kfifo_is_empty(_kf) \
+({ \
+ ((_kf)->count == 0) ? true : false; \
+})
+
+#define kfifo_is_full(_kf) \
+({ \
+ ((_kf)->count == (_kf)->total) ? true : false; \
+})
+
+#define kfifo_put(_kf, _e) \
+({ \
+ bool _rc; \
+ \
+ /* Would overflow. */ \
+ if (kfifo_is_full(_kf)) { \
+ _rc = false; \
+ } else { \
+ (_kf)->head[(_kf)->last] = (_e); \
+ (_kf)->count++; \
+ (_kf)->last++; \
+ if ((_kf)->last > (_kf)->total) \
+ (_kf)->last = 0; \
+ _rc = true; \
+ } \
+ \
+ _rc; \
+})
+
+#define kfifo_get(_kf, _e) \
+({ \
+ bool _rc; \
+ \
+ if (kfifo_is_empty(_kf)) { \
+ _rc = false; \
+ } else { \
+ *(_e) = (_kf)->head[(_kf)->first]; \
+ (_kf)->count--; \
+ (_kf)->first++; \
+ if ((_kf)->first > (_kf)->total) \
+ (_kf)->first = 0; \
+ _rc = true; \
+ } \
+ \
+ _rc; \
+})
+
+#define kfifo_alloc(_kf, _s, _gfp) \
+({ \
+ int _error; \
+ \
+ (_kf)->head = kmalloc(sizeof(__typeof(*(_kf)->head)) * (_s), _gfp); \
+ if ((_kf)->head == NULL) \
+ _error = ENOMEM; \
+ else { \
+ (_kf)->total = (_s); \
+ _error = 0; \
+ } \
+ \
+ _error; \
+})
+
+#define kfifo_free(_kf) \
+({ \
+ kfree((_kf)->head); \
+ (_kf)->head = NULL; \
+ (_kf)->total = (_kf)->count = (_kf)->first = (_kf)->last = 0; \
+})
+
#endif /* _LINUXKPI_LINUX_KFIFO_H_*/

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