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/*
* include/types/quic_loss.h
* This file contains definitions for QUIC loss detection.
*
* Copyright 2019 HAProxy Technologies, Frederic Lecaille <flecaille@haproxy.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation, version 2.1
* exclusively.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _TYPES_QUIC_LOSS_H
#define _TYPES_QUIC_LOSS_H
#ifdef USE_QUIC
#ifndef USE_OPENSSL
#error "Must define USE_OPENSSL"
#endif
#include <inttypes.h>
/* Maximum reordering in packets. */
#define QUIC_LOSS_PACKET_THRESHOLD 3
#define QUIC_TIMER_GRANULARITY 1U /* 1ms */
#define QUIC_LOSS_INITIAL_RTT 333U /* 333ms */
/* QUIC loss time threshold expressed an RTT multiplier
* (QUIC_LOSS_TIME_THRESHOLD_MULTIPLICAND / QUIC_LOSS_TIME_THRESHOLD_DIVISOR)
*/
#define QUIC_LOSS_TIME_THRESHOLD_MULTIPLICAND 9
#define QUIC_LOSS_TIME_THRESHOLD_DIVISOR 8
/* Note that all the unit of variables for QUIC LOSS dectections
* is the tick.
*/
struct quic_loss {
/* The most recent RTT measurement. */
unsigned int latest_rtt;
/* Smoothed RTT << 3 */
unsigned int srtt;
/* RTT variation << 2 */
unsigned int rtt_var;
/* Minimum RTT. */
unsigned int rtt_min;
/* Number of NACKed sent PTO. */
unsigned int pto_count;
};
#endif /* USE_QUIC */
#endif /* _TYPES_QUIC_LOSS_H */
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