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QUIC: do not shrink congestion window after losing an MTU probe.

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As per RFC 9000, Section 14.4:

    Loss of a QUIC packet that is carried in a PMTU probe is therefore
    not a reliable indication of congestion and SHOULD NOT trigger a
    congestion control reaction.
This commit is contained in:
Roman Arutyunyan 2025-01-06 16:27:03 +04:00
parent cab22e246c
commit c0aec46b6e
3 changed files with 10 additions and 0 deletions
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8
src/event/quic/ngx_event_quic_ack.c
View File

@ -755,6 +755,14 @@ ngx_quic_congestion_lost(ngx_connection_t *c, ngx_quic_frame_t *f)
goto done;
}
if (f->ignore_loss) {
ngx_log_debug3(NGX_LOG_DEBUG_EVENT, c->log, 0,
"quic congestion lost ignore t:%M win:%uz if:%uz",
now, cg->window, cg->in_flight);
goto done;
}
cg->recovery_start = now;
cg->window /= 2;

1
src/event/quic/ngx_event_quic_migration.c
View File

@ -923,6 +923,7 @@ ngx_quic_send_path_mtu_probe(ngx_connection_t *c, ngx_quic_path_t *path)
frame->level = ssl_encryption_application;
frame->type = NGX_QUIC_FT_PING;
frame->ignore_loss = 1;
qc = ngx_quic_get_connection(c);
ctx = ngx_quic_get_send_ctx(qc, ssl_encryption_application);

1
src/event/quic/ngx_event_quic_transport.h
View File

@ -271,6 +271,7 @@ struct ngx_quic_frame_s {
unsigned need_ack:1;
unsigned pkt_need_ack:1;
unsigned ignore_congestion:1;
unsigned ignore_loss:1;
ngx_chain_t *data;
union {