tcp: improve KASSERT in limited retransmit

When doing a limited retransmit, allow up to 2 * MSS - 1 if the
Nagle algorithm has been disabled.

PR:			282605
Reviewed by:		cc, Peter Lei
MFC after:		3 days
Sponsored by:		Netflix, Inc.
Differential Revision:	https://reviews.freebsd.org/D49922

This commit is contained in:

Michael Tuexen

2025-05-01 18:11:03 +02:00

parent a592b5fd9d

commit 934caaec3a

1 changed files with 5 additions and 3 deletions

									
										sys/netinet/tcp_input.c
									
		+5
		-3
	
												View File
												
				@@ -2815,9 +2815,11 @@ tcp_do_segment(struct tcpcb *tp, struct mbuf *m, struct tcphdr *th,

										KASSERT((tp->t_dupacks == 2 &&

										    tp->snd_limited == 0) ||

										   (sent == maxseg + 1 &&

										    tp->t_flags & TF_SENTFIN),

										    ("%s: sent too much",

										    __func__));

										    tp->t_flags & TF_SENTFIN) ||

										   (sent < 2 * maxseg &&

										    tp->t_flags & TF_NODELAY),

										    ("%s: sent too much: %u>%u",

										    __func__, sent, maxseg));

										tp->snd_limited = 2;

									} else if (sent > 0) {

										++tp->snd_limited;