/* SPDX-License-Identifier: GPL-2.0-or-later */ #ifndef _TFRC_H_ #define _TFRC_H_ /* * Copyright (c) 2007 The University of Aberdeen, Scotland, UK * Copyright (c) 2005-6 The University of Waikato, Hamilton, New Zealand. * Copyright (c) 2005-6 Ian McDonald <ian.mcdonald@jandi.co.nz> * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br> * Copyright (c) 2003 Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon */ #include <linux/types.h> #include <linux/math64.h> #include "../../dccp.h" /* internal includes that this library exports: */ #include "loss_interval.h" #include "packet_history.h" #ifdef CONFIG_IP_DCCP_TFRC_DEBUG extern bool tfrc_debug; #define tfrc_pr_debug(format, a...) DCCP_PR_DEBUG(tfrc_debug, format, ##a) #else #define tfrc_pr_debug(format, a...) #endif /* integer-arithmetic divisions of type (a * 1000000)/b */ static inline u64 scaled_div(u64 a, u64 b) { BUG_ON(b == 0); return div64_u64(a * 1000000, b); } static inline u32 scaled_div32(u64 a, u64 b) { u64 result = scaled_div(a, b); if (result > UINT_MAX) { DCCP_CRIT("Overflow: %llu/%llu > UINT_MAX", (unsigned long long)a, (unsigned long long)b); return UINT_MAX; } return result; } /** * tfrc_ewma - Exponentially weighted moving average * @weight: Weight to be used as damping factor, in units of 1/10 */ static inline u32 tfrc_ewma(const u32 avg, const u32 newval, const u8 weight) { return avg ? (weight * avg + (10 - weight) * newval) / 10 : newval; } u32 tfrc_calc_x(u16 s, u32 R, u32 p); u32 tfrc_calc_x_reverse_lookup(u32 fvalue); u32 tfrc_invert_loss_event_rate(u32 loss_event_rate); int tfrc_tx_packet_history_init(void); void tfrc_tx_packet_history_exit(void); int tfrc_rx_packet_history_init(void); void tfrc_rx_packet_history_exit(void); int tfrc_li_init(void); void tfrc_li_exit(void); #ifdef CONFIG_IP_DCCP_TFRC_LIB int tfrc_lib_init(void); void tfrc_lib_exit(void); #else #define tfrc_lib_init() (0) #define tfrc_lib_exit() #endif #endif /* _TFRC_H_ */