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LinuxKPI: extend kfifo to be usable

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Implement some basic kfifo pieces as needed by drivers.

MFC after:	2 weeks
Reviewed by:	wulf, hselasky
Differential Revision: https://reviews.freebsd.org/D35829
This commit is contained in:
Bjoern A. Zeeb 2022-07-16 00:36:55 +00:00
parent 97ecdc00ac
commit 4a7e8c7bd4
1 changed files with 89 additions and 0 deletions
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89
sys/compat/linuxkpi/common/include/linux/kfifo.h
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@ -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_*/