tree 0e16b324a6030b65c539324b97f1da75d9d1e151
parent 242016d566a53fbf121205ffcb2fcb1633d514e7
author Junho Choi <junho@cloudflare.com> 1621296815 -0700
committer Junho Choi <junho.choi@gmail.com> 1654376012 -0700
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cc: BBR congestion control

Adding a new congestion control module `bbr`, implementing
BBR Congestion Control algorithm as specified in
draft-cardwell-iccrg-bbr-congestion-control-00 (bbr version 1).

Added files:
- `bbr/mod.rs`: congestion control modules hooks.
- `bbr/init.rs`: initialization functions.
- `bbr/pacing.rs`: pacing functions.
- `bbr/per_ack.rs`: ACK processing functions.
- `bbr/per_transmit.rs`: per-transmit functions.

Notable changes:
- In `on_packets_acked()` hook, run `bbr_update_model_and_state()`
  per ACK'ed packets for most of state changes and run
  `bbr_update_control_parameters()` at the end for updating control
  parameters (e.g. pacing rate, cwnd) for ACK received.
- `has_custom_pacing()` now returns true: pacing rate will be
  updated during ACK processing.
- No Hystart/PRR will be used even enabled.