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/*
* ngtcp2
*
* Copyright (c) 2019 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_RST_H
#define NGTCP2_RST_H
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif /* defined(HAVE_CONFIG_H) */
#include <ngtcp2/ngtcp2.h>
#include "ngtcp2_window_filter.h"
typedef struct ngtcp2_rtb_entry ngtcp2_rtb_entry;
typedef struct ngtcp2_conn_stat ngtcp2_conn_stat;
/**
* @struct
*
* ngtcp2_rs contains connection state for delivery rate estimation.
*/
typedef struct ngtcp2_rs {
ngtcp2_duration interval;
uint64_t delivered;
uint64_t prior_delivered;
ngtcp2_tstamp prior_ts;
uint64_t tx_in_flight;
uint64_t lost;
uint64_t prior_lost;
ngtcp2_duration send_elapsed;
ngtcp2_duration ack_elapsed;
int64_t last_end_seq;
int is_app_limited;
} ngtcp2_rs;
void ngtcp2_rs_init(ngtcp2_rs *rs);
/*
* ngtcp2_rst implements delivery rate estimation described in
* https://ietf-wg-ccwg.github.io/draft-cardwell-ccwg-bbr/draft-cardwell-ccwg-bbr.html
*/
typedef struct ngtcp2_rst {
ngtcp2_rs rs;
uint64_t delivered;
ngtcp2_tstamp delivered_ts;
ngtcp2_tstamp first_sent_ts;
uint64_t app_limited;
uint64_t lost;
/* last_seq is the sequence number of packets across all packet
number spaces. If we would adopt single packet number sequence
across all packet number spaces, we can replace this with a
packet number. */
int64_t last_seq;
int is_cwnd_limited;
} ngtcp2_rst;
void ngtcp2_rst_init(ngtcp2_rst *rst);
void ngtcp2_rst_on_pkt_sent(ngtcp2_rst *rst, ngtcp2_rtb_entry *ent,
const ngtcp2_conn_stat *cstat);
void ngtcp2_rst_on_ack_recv(ngtcp2_rst *rst, ngtcp2_conn_stat *cstat);
void ngtcp2_rst_update_rate_sample(ngtcp2_rst *rst, const ngtcp2_rtb_entry *ent,
ngtcp2_tstamp ts);
void ngtcp2_rst_update_app_limited(ngtcp2_rst *rst, ngtcp2_conn_stat *cstat);
#endif /* !defined(NGTCP2_RST_H) */
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