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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.
*/
#include "ngtcp2_rst.h"
#include <assert.h>
#include "ngtcp2_rtb.h"
#include "ngtcp2_cc.h"
#include "ngtcp2_macro.h"
void ngtcp2_rs_init(ngtcp2_rs *rs) {
rs->interval = UINT64_MAX;
rs->delivered = 0;
rs->prior_delivered = 0;
rs->prior_ts = 0;
rs->tx_in_flight = 0;
rs->lost = 0;
rs->prior_lost = 0;
rs->send_elapsed = 0;
rs->ack_elapsed = 0;
rs->is_app_limited = 0;
}
void ngtcp2_rst_init(ngtcp2_rst *rst) {
ngtcp2_rs_init(&rst->rs);
ngtcp2_window_filter_init(&rst->wf, 12);
rst->delivered = 0;
rst->delivered_ts = 0;
rst->first_sent_ts = 0;
rst->app_limited = 0;
rst->next_round_delivered = 0;
rst->round_count = 0;
rst->is_cwnd_limited = 0;
rst->lost = 0;
}
void ngtcp2_rst_on_pkt_sent(ngtcp2_rst *rst, ngtcp2_rtb_entry *ent,
const ngtcp2_conn_stat *cstat) {
if (cstat->bytes_in_flight == 0) {
rst->first_sent_ts = rst->delivered_ts = ent->ts;
}
ent->rst.first_sent_ts = rst->first_sent_ts;
ent->rst.delivered_ts = rst->delivered_ts;
ent->rst.delivered = rst->delivered;
ent->rst.is_app_limited = rst->app_limited != 0;
ent->rst.tx_in_flight = cstat->bytes_in_flight + ent->pktlen;
ent->rst.lost = rst->lost;
}
int ngtcp2_rst_on_ack_recv(ngtcp2_rst *rst, ngtcp2_conn_stat *cstat,
uint64_t pkt_delivered) {
ngtcp2_rs *rs = &rst->rs;
uint64_t rate;
if (rst->app_limited && rst->delivered > rst->app_limited) {
rst->app_limited = 0;
}
if (pkt_delivered >= rst->next_round_delivered) {
rst->next_round_delivered = pkt_delivered;
++rst->round_count;
}
if (rs->prior_ts == 0) {
return 0;
}
rs->interval = ngtcp2_max(rs->send_elapsed, rs->ack_elapsed);
rs->delivered = rst->delivered - rs->prior_delivered;
rs->lost = rst->lost - rs->prior_lost;
if (rs->interval < cstat->min_rtt) {
rs->interval = UINT64_MAX;
return 0;
}
if (!rs->interval) {
return 0;
}
rate = rs->delivered * NGTCP2_SECONDS / rs->interval;
if (rate > ngtcp2_window_filter_get_best(&rst->wf) || !rst->app_limited) {
ngtcp2_window_filter_update(&rst->wf, rate, rst->round_count);
cstat->delivery_rate_sec = ngtcp2_window_filter_get_best(&rst->wf);
}
return 0;
}
void ngtcp2_rst_update_rate_sample(ngtcp2_rst *rst, const ngtcp2_rtb_entry *ent,
ngtcp2_tstamp ts) {
ngtcp2_rs *rs = &rst->rs;
rst->delivered += ent->pktlen;
rst->delivered_ts = ts;
if (ent->rst.delivered > rs->prior_delivered) {
rs->prior_delivered = ent->rst.delivered;
rs->prior_ts = ent->rst.delivered_ts;
rs->is_app_limited = ent->rst.is_app_limited;
rs->send_elapsed = ent->ts - ent->rst.first_sent_ts;
rs->ack_elapsed = rst->delivered_ts - ent->rst.delivered_ts;
rs->tx_in_flight = ent->rst.tx_in_flight;
rs->prior_lost = ent->rst.lost;
rst->first_sent_ts = ent->ts;
}
}
void ngtcp2_rst_update_app_limited(ngtcp2_rst *rst, ngtcp2_conn_stat *cstat) {
(void)rst;
(void)cstat;
/* TODO Not implemented */
}
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