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/* Please avoid adding hacks here - instead add it to mac80211/backports.git */
#undef CONFIG_MODULE_STRIPPED
#include <linux/version.h> /* LINUX_VERSION_CODE */
#include <linux/types.h>
#if LINUX_VERSION_IS_LESS(6, 15, 0)
#include <linux/crc32c.h>
#endif /* LINUX_VERSION_IS_LESS(6, 15, 0) */
#if LINUX_VERSION_IS_LESS(6, 16, 0)
#define timer_container_of(var, callback_timer, timer_fieldname) \
from_timer(var, callback_timer, timer_fieldname)
#endif /* LINUX_VERSION_IS_LESS(6, 16, 0) */
#if LINUX_VERSION_IS_LESS(6, 16, 0) || !defined(CONFIG_NET_CRC32C)
#include <linux/skbuff.h>
#include <linux/crc32.h>
static inline u32 batadv_skb_crc32c(struct sk_buff *skb, int offset,
int len, u32 crc)
{
unsigned int to = offset + len;
unsigned int consumed = 0;
struct skb_seq_state st;
unsigned int l;
const u8 *data;
if (len <= 0)
return crc;
skb_prepare_seq_read(skb, offset, to, &st);
while ((l = skb_seq_read(consumed, &data, &st)) != 0) {
crc = crc32c(crc, data, l);
consumed += l;
}
return crc;
}
#define skb_crc32c batadv_skb_crc32c
#endif /* LINUX_VERSION_IS_LESS(6, 16, 0) || !defined(CONFIG_NET_CRC32C) */
/* <DECLARE_EWMA> */
#include <linux/version.h>
#include_next <linux/average.h>
#include <linux/bug.h>
#ifdef DECLARE_EWMA
#undef DECLARE_EWMA
#endif /* DECLARE_EWMA */
/*
* Exponentially weighted moving average (EWMA)
*
* This implements a fixed-precision EWMA algorithm, with both the
* precision and fall-off coefficient determined at compile-time
* and built into the generated helper funtions.
*
* The first argument to the macro is the name that will be used
* for the struct and helper functions.
*
* The second argument, the precision, expresses how many bits are
* used for the fractional part of the fixed-precision values.
*
* The third argument, the weight reciprocal, determines how the
* new values will be weighed vs. the old state, new values will
* get weight 1/weight_rcp and old values 1-1/weight_rcp. Note
* that this parameter must be a power of two for efficiency.
*/
#define DECLARE_EWMA(name, _precision, _weight_rcp) \
struct ewma_##name { \
unsigned long internal; \
}; \
static inline void ewma_##name##_init(struct ewma_##name *e) \
{ \
BUILD_BUG_ON(!__builtin_constant_p(_precision)); \
BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp)); \
/* \
* Even if you want to feed it just 0/1 you should have \
* some bits for the non-fractional part... \
*/ \
BUILD_BUG_ON((_precision) > 30); \
BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp); \
e->internal = 0; \
} \
static inline unsigned long \
ewma_##name##_read(struct ewma_##name *e) \
{ \
BUILD_BUG_ON(!__builtin_constant_p(_precision)); \
BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp)); \
BUILD_BUG_ON((_precision) > 30); \
BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp); \
return e->internal >> (_precision); \
} \
static inline void ewma_##name##_add(struct ewma_##name *e, \
unsigned long val) \
{ \
unsigned long internal = READ_ONCE(e->internal); \
unsigned long weight_rcp = ilog2(_weight_rcp); \
unsigned long precision = _precision; \
\
BUILD_BUG_ON(!__builtin_constant_p(_precision)); \
BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp)); \
BUILD_BUG_ON((_precision) > 30); \
BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp); \
\
WRITE_ONCE(e->internal, internal ? \
(((internal << weight_rcp) - internal) + \
(val << precision)) >> weight_rcp : \
(val << precision)); \
}
/* </DECLARE_EWMA> */
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