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/*
* ngtcp2
*
* Copyright (c) 2023 ngtcp2 contributors
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef NGTCP2_CONN_STAT_H
#define NGTCP2_CONN_STAT_H
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif /* defined(HAVE_CONFIG_H) */
#include <ngtcp2/ngtcp2.h>
/**
* @struct
*
* :type:`ngtcp2_conn_stat` holds various connection statistics, and
* computed data for recovery and congestion controller.
*/
typedef struct ngtcp2_conn_stat {
/**
* :member:`latest_rtt` is the latest RTT sample which is not
* adjusted by acknowledgement delay.
*/
ngtcp2_duration latest_rtt;
/**
* :member:`min_rtt` is the minimum RTT seen so far. It is not
* adjusted by acknowledgement delay.
*/
ngtcp2_duration min_rtt;
/**
* :member:`smoothed_rtt` is the smoothed RTT.
*/
ngtcp2_duration smoothed_rtt;
/**
* :member:`rttvar` is a mean deviation of observed RTT.
*/
ngtcp2_duration rttvar;
/**
* :member:`initial_rtt` is the initial RTT which is used when no
* RTT sample is available.
*/
ngtcp2_duration initial_rtt;
/**
* :member:`first_rtt_sample_ts` is the timestamp when the first RTT
* sample is obtained.
*/
ngtcp2_tstamp first_rtt_sample_ts;
/**
* :member:`pto_count` is the count of successive PTO timer
* expiration.
*/
size_t pto_count;
/**
* :member:`loss_detection_timer` is the deadline of the current
* loss detection timer.
*/
ngtcp2_tstamp loss_detection_timer;
/**
* :member:`last_tx_pkt_ts` corresponds to
* time_of_last_ack_eliciting_packet in :rfc:`9002`.
*/
ngtcp2_tstamp last_tx_pkt_ts[NGTCP2_PKTNS_ID_MAX];
/**
* :member:`loss_time` corresponds to loss_time in :rfc:`9002`.
*/
ngtcp2_tstamp loss_time[NGTCP2_PKTNS_ID_MAX];
/**
* :member:`cwnd` is the size of congestion window.
*/
uint64_t cwnd;
/**
* :member:`ssthresh` is slow start threshold.
*/
uint64_t ssthresh;
/**
* :member:`congestion_recovery_start_ts` is the timestamp when
* congestion recovery started.
*/
ngtcp2_tstamp congestion_recovery_start_ts;
/**
* :member:`bytes_in_flight` is the number in bytes of all sent
* packets which have not been acknowledged.
*/
uint64_t bytes_in_flight;
/**
* :member:`max_tx_udp_payload_size` is the maximum size of UDP
* datagram payload that this endpoint transmits to the current
* path. It is used by congestion controller to compute congestion
* window.
*/
size_t max_tx_udp_payload_size;
/**
* :member:`delivery_rate_sec` is the current sending rate measured
* in byte per second.
*/
uint64_t delivery_rate_sec;
/**
* :member:`pacing_interval` is the inverse of pacing rate, which is
* the current packet sending rate computed by a congestion
* controller. 0 if a congestion controller does not set pacing
* interval. Even if this value is set to 0, the library paces
* packets.
*/
ngtcp2_duration pacing_interval;
/**
* :member:`send_quantum` is the maximum size of a data aggregate
* scheduled and transmitted together.
*/
size_t send_quantum;
} ngtcp2_conn_stat;
#endif /* !defined(NGTCP2_CONN_STAT_H) */
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