cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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tfrc.h (2011B)


      1/* SPDX-License-Identifier: GPL-2.0-or-later */
      2#ifndef _TFRC_H_
      3#define _TFRC_H_
      4/*
      5 *  Copyright (c) 2007   The University of Aberdeen, Scotland, UK
      6 *  Copyright (c) 2005-6 The University of Waikato, Hamilton, New Zealand.
      7 *  Copyright (c) 2005-6 Ian McDonald <ian.mcdonald@jandi.co.nz>
      8 *  Copyright (c) 2005   Arnaldo Carvalho de Melo <acme@conectiva.com.br>
      9 *  Copyright (c) 2003   Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon
     10 */
     11#include <linux/types.h>
     12#include <linux/math64.h>
     13#include "../../dccp.h"
     14
     15/* internal includes that this library exports: */
     16#include "loss_interval.h"
     17#include "packet_history.h"
     18
     19#ifdef CONFIG_IP_DCCP_TFRC_DEBUG
     20extern bool tfrc_debug;
     21#define tfrc_pr_debug(format, a...)	DCCP_PR_DEBUG(tfrc_debug, format, ##a)
     22#else
     23#define tfrc_pr_debug(format, a...)
     24#endif
     25
     26/* integer-arithmetic divisions of type (a * 1000000)/b */
     27static inline u64 scaled_div(u64 a, u64 b)
     28{
     29	BUG_ON(b == 0);
     30	return div64_u64(a * 1000000, b);
     31}
     32
     33static inline u32 scaled_div32(u64 a, u64 b)
     34{
     35	u64 result = scaled_div(a, b);
     36
     37	if (result > UINT_MAX) {
     38		DCCP_CRIT("Overflow: %llu/%llu > UINT_MAX",
     39			  (unsigned long long)a, (unsigned long long)b);
     40		return UINT_MAX;
     41	}
     42	return result;
     43}
     44
     45/**
     46 * tfrc_ewma  -  Exponentially weighted moving average
     47 * @weight: Weight to be used as damping factor, in units of 1/10
     48 */
     49static inline u32 tfrc_ewma(const u32 avg, const u32 newval, const u8 weight)
     50{
     51	return avg ? (weight * avg + (10 - weight) * newval) / 10 : newval;
     52}
     53
     54u32 tfrc_calc_x(u16 s, u32 R, u32 p);
     55u32 tfrc_calc_x_reverse_lookup(u32 fvalue);
     56u32 tfrc_invert_loss_event_rate(u32 loss_event_rate);
     57
     58int tfrc_tx_packet_history_init(void);
     59void tfrc_tx_packet_history_exit(void);
     60int tfrc_rx_packet_history_init(void);
     61void tfrc_rx_packet_history_exit(void);
     62
     63int tfrc_li_init(void);
     64void tfrc_li_exit(void);
     65
     66#ifdef CONFIG_IP_DCCP_TFRC_LIB
     67int tfrc_lib_init(void);
     68void tfrc_lib_exit(void);
     69#else
     70#define tfrc_lib_init() (0)
     71#define tfrc_lib_exit()
     72#endif
     73#endif /* _TFRC_H_ */