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/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef _LINUX_TFRC_H_
#define _LINUX_TFRC_H_
/*
* TFRC - Data Structures for the TCP-Friendly Rate Control congestion
* control mechanism as specified in RFC 3448.
*
* Copyright (c) 2005 The University of Waikato, Hamilton, New Zealand.
* Copyright (c) 2005 Ian McDonald <iam4@cs.waikato.ac.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>
/** tfrc_rx_info - TFRC Receiver Data Structure
*
* @tfrcrx_x_recv: receiver estimate of sending rate (3.2.2)
* @tfrcrx_rtt: round-trip-time (communicated by sender)
* @tfrcrx_p: current estimate of loss event rate (3.2.2)
*/
struct tfrc_rx_info {
__u32 tfrcrx_x_recv;
__u32 tfrcrx_rtt;
__u32 tfrcrx_p;
};
/** tfrc_tx_info - TFRC Sender Data Structure
*
* @tfrctx_x: computed transmit rate (4.3 (4))
* @tfrctx_x_recv: receiver estimate of send rate (4.3)
* @tfrctx_x_calc: return value of throughput equation (3.1)
* @tfrctx_rtt: (moving average) estimate of RTT (4.3)
* @tfrctx_p: current loss event rate (5.4)
* @tfrctx_rto: estimate of RTO, equals 4*RTT (4.3)
* @tfrctx_ipi: inter-packet interval (4.6)
*
* Note: X and X_recv are both maintained in units of 64 * bytes/second. This
* enables a finer resolution of sending rates and avoids problems with
* integer arithmetic; u32 is not sufficient as scaling consumes 6 bits.
*/
struct tfrc_tx_info {
__u64 tfrctx_x;
__u64 tfrctx_x_recv;
__u32 tfrctx_x_calc;
__u32 tfrctx_rtt;
__u32 tfrctx_p;
__u32 tfrctx_rto;
__u32 tfrctx_ipi;
};
#endif /* _LINUX_TFRC_H_ */
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