Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) /* SPDX-License-Identifier: GPL-2.0-or-later */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) #ifndef _TFRC_H_
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) #define _TFRC_H_
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  *  Copyright (c) 2007   The University of Aberdeen, Scotland, UK
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  *  Copyright (c) 2005-6 The University of Waikato, Hamilton, New Zealand.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  *  Copyright (c) 2005-6 Ian McDonald <ian.mcdonald@jandi.co.nz>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  *  Copyright (c) 2005   Arnaldo Carvalho de Melo <acme@conectiva.com.br>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  *  Copyright (c) 2003   Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/math64.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include "../../dccp.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) /* internal includes that this library exports: */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include "loss_interval.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include "packet_history.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #ifdef CONFIG_IP_DCCP_TFRC_DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) extern bool tfrc_debug;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #define tfrc_pr_debug(format, a...)	DCCP_PR_DEBUG(tfrc_debug, format, ##a)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #define tfrc_pr_debug(format, a...)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) /* integer-arithmetic divisions of type (a * 1000000)/b */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) static inline u64 scaled_div(u64 a, u64 b)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	BUG_ON(b == 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	return div64_u64(a * 1000000, b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) static inline u32 scaled_div32(u64 a, u64 b)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	u64 result = scaled_div(a, b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	if (result > UINT_MAX) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 		DCCP_CRIT("Overflow: %llu/%llu > UINT_MAX",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 			  (unsigned long long)a, (unsigned long long)b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 		return UINT_MAX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	return result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)  * tfrc_ewma  -  Exponentially weighted moving average
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)  * @weight: Weight to be used as damping factor, in units of 1/10
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) static inline u32 tfrc_ewma(const u32 avg, const u32 newval, const u8 weight)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 	return avg ? (weight * avg + (10 - weight) * newval) / 10 : newval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) u32 tfrc_calc_x(u16 s, u32 R, u32 p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) u32 tfrc_calc_x_reverse_lookup(u32 fvalue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) u32 tfrc_invert_loss_event_rate(u32 loss_event_rate);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) int tfrc_tx_packet_history_init(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) void tfrc_tx_packet_history_exit(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) int tfrc_rx_packet_history_init(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) void tfrc_rx_packet_history_exit(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) int tfrc_li_init(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) void tfrc_li_exit(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) #ifdef CONFIG_IP_DCCP_TFRC_LIB
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) int tfrc_lib_init(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) void tfrc_lib_exit(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) #define tfrc_lib_init() (0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) #define tfrc_lib_exit()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) #endif /* _TFRC_H_ */