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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// option. This file may not be copied, modified, or distributed
// except according to those terms.
// Congestion control
use std::{
fmt::{Debug, Display},
str::FromStr,
time::{Duration, Instant},
};
use neqo_common::qlog::NeqoQlog;
use crate::{recovery::SentPacket, rtt::RttEstimate, Error, Pmtud};
mod classic_cc;
mod cubic;
mod new_reno;
pub use classic_cc::ClassicCongestionControl;
#[cfg(test)]
pub use classic_cc::CWND_INITIAL_PKTS;
pub use cubic::Cubic;
pub use new_reno::NewReno;
pub trait CongestionControl: Display + Debug {
fn set_qlog(&mut self, qlog: NeqoQlog);
#[must_use]
fn cwnd(&self) -> usize;
#[must_use]
fn bytes_in_flight(&self) -> usize;
#[must_use]
fn cwnd_avail(&self) -> usize;
#[must_use]
fn cwnd_min(&self) -> usize;
#[cfg(test)]
#[must_use]
fn cwnd_initial(&self) -> usize;
#[must_use]
fn pmtud(&self) -> &Pmtud;
#[must_use]
fn pmtud_mut(&mut self) -> &mut Pmtud;
fn on_packets_acked(&mut self, acked_pkts: &[SentPacket], rtt_est: &RttEstimate, now: Instant);
/// Returns true if the congestion window was reduced.
fn on_packets_lost(
&mut self,
first_rtt_sample_time: Option<Instant>,
prev_largest_acked_sent: Option<Instant>,
pto: Duration,
lost_packets: &[SentPacket],
) -> bool;
/// Returns true if the congestion window was reduced.
fn on_ecn_ce_received(&mut self, largest_acked_pkt: &SentPacket) -> bool;
#[must_use]
fn recovery_packet(&self) -> bool;
fn discard(&mut self, pkt: &SentPacket);
fn on_packet_sent(&mut self, pkt: &SentPacket);
fn discard_in_flight(&mut self);
}
#[derive(Debug, Copy, Clone)]
pub enum CongestionControlAlgorithm {
NewReno,
Cubic,
}
// A `FromStr` implementation so that this can be used in command-line interfaces.
impl FromStr for CongestionControlAlgorithm {
type Err = Error;
fn from_str(s: &str) -> Result<Self, Self::Err> {
match s.trim().to_ascii_lowercase().as_str() {
"newreno" | "reno" => Ok(Self::NewReno),
"cubic" => Ok(Self::Cubic),
_ => Err(Error::InvalidInput),
}
}
}
#[cfg(test)]
mod tests;