From: Frédéric Lécaille <flecaille@haproxy.com>
Date: Thu, 6 Apr 2023 11:13:08 +0000 (+0200)
Subject: BUG/MINOR: quic: Ignored less than 1ms RTTs
X-Git-Tag: v2.8-dev8~173
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=809bd9fed134ec278e3839638a303fd8b0249adf;p=thirdparty%2Fhaproxy.git

BUG/MINOR: quic: Ignored less than 1ms RTTs

Do not ignore very short RTTs (less than 1ms) before computing the smoothed
RTT initializing it to an "infinite" value (UINT_MAX).

Must be backported to 2.7 and 2.6.
---

diff --git a/src/quic_conn.c b/src/quic_conn.c
index d87bf05b69..9412b8900f 100644
--- a/src/quic_conn.c
+++ b/src/quic_conn.c
@@ -3117,13 +3117,13 @@ static int qc_parse_pkt_frms(struct quic_conn *qc, struct quic_rx_packet *pkt,
 		{
 			unsigned int rtt_sample;
 
-			rtt_sample = 0;
+			rtt_sample = UINT_MAX;
 			if (!qc_parse_ack_frm(qc, &frm, qel, &rtt_sample, &pos, end)) {
 				// trace already emitted by function above
 				goto leave;
 			}
 
-			if (rtt_sample) {
+			if (rtt_sample != UINT_MAX) {
 				unsigned int ack_delay;
 
 				ack_delay = !quic_application_pktns(qel->pktns, qc) ? 0 :