119 lines
3.5 KiB
C
119 lines
3.5 KiB
C
/* Please avoid adding hacks here - instead add it to mac80211/backports.git */
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#undef CONFIG_MODULE_STRIPPED
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#include <linux/version.h> /* LINUX_VERSION_CODE */
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#include <linux/types.h>
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#if LINUX_VERSION_IS_LESS(6, 0, 0)
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#define __vstring(item, fmt, ap) __dynamic_array(char, item, 256)
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#define __assign_vstr(dst, fmt, va) \
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WARN_ON_ONCE(vsnprintf(__get_dynamic_array(dst), 256, fmt, *va) >= 256)
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#endif /* LINUX_VERSION_IS_LESS(6, 0, 0) */
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#if LINUX_VERSION_IS_LESS(6, 2, 0)
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#include <linux/random.h>
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#define genl_split_ops genl_ops
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static inline u32 batadv_get_random_u32_below(u32 ep_ro)
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{
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return prandom_u32_max(ep_ro);
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}
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#define get_random_u32_below batadv_get_random_u32_below
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#endif /* LINUX_VERSION_IS_LESS(6, 2, 0) */
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#if LINUX_VERSION_IS_LESS(6, 4, 0)
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#include <linux/if_vlan.h>
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/* Prefer this version in TX path, instead of
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* skb_reset_mac_header() + vlan_eth_hdr()
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*/
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static inline struct vlan_ethhdr *skb_vlan_eth_hdr(const struct sk_buff *skb)
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{
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return (struct vlan_ethhdr *)skb->data;
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}
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#endif /* LINUX_VERSION_IS_LESS(6, 4, 0) */
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/* <DECLARE_EWMA> */
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#include <linux/version.h>
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#include_next <linux/average.h>
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#include <linux/bug.h>
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#ifdef DECLARE_EWMA
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#undef DECLARE_EWMA
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#endif /* DECLARE_EWMA */
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/*
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* Exponentially weighted moving average (EWMA)
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*
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* This implements a fixed-precision EWMA algorithm, with both the
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* precision and fall-off coefficient determined at compile-time
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* and built into the generated helper funtions.
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*
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* The first argument to the macro is the name that will be used
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* for the struct and helper functions.
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*
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* The second argument, the precision, expresses how many bits are
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* used for the fractional part of the fixed-precision values.
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*
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* The third argument, the weight reciprocal, determines how the
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* new values will be weighed vs. the old state, new values will
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* get weight 1/weight_rcp and old values 1-1/weight_rcp. Note
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* that this parameter must be a power of two for efficiency.
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*/
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#define DECLARE_EWMA(name, _precision, _weight_rcp) \
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struct ewma_##name { \
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unsigned long internal; \
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}; \
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static inline void ewma_##name##_init(struct ewma_##name *e) \
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{ \
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BUILD_BUG_ON(!__builtin_constant_p(_precision)); \
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BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp)); \
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/* \
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* Even if you want to feed it just 0/1 you should have \
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* some bits for the non-fractional part... \
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*/ \
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BUILD_BUG_ON((_precision) > 30); \
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BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp); \
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e->internal = 0; \
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} \
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static inline unsigned long \
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ewma_##name##_read(struct ewma_##name *e) \
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{ \
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BUILD_BUG_ON(!__builtin_constant_p(_precision)); \
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BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp)); \
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BUILD_BUG_ON((_precision) > 30); \
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BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp); \
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return e->internal >> (_precision); \
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} \
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static inline void ewma_##name##_add(struct ewma_##name *e, \
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unsigned long val) \
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{ \
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unsigned long internal = READ_ONCE(e->internal); \
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unsigned long weight_rcp = ilog2(_weight_rcp); \
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unsigned long precision = _precision; \
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\
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BUILD_BUG_ON(!__builtin_constant_p(_precision)); \
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BUILD_BUG_ON(!__builtin_constant_p(_weight_rcp)); \
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BUILD_BUG_ON((_precision) > 30); \
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BUILD_BUG_ON_NOT_POWER_OF_2(_weight_rcp); \
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\
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WRITE_ONCE(e->internal, internal ? \
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(((internal << weight_rcp) - internal) + \
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(val << precision)) >> weight_rcp : \
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(val << precision)); \
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}
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/* </DECLARE_EWMA> */
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