K 10
svn:author
V 7
rscheff
K 8
svn:date
V 27
2022-09-25T10:05:51.057167Z
K 7
svn:log
V 659
tcp: fix cwnd restricted SACK retransmission loop

While doing the initial SACK retransmission segment while heavily cwnd
constrained, tcp_ouput can erroneously send out the entire sendbuffer
again. This may happen after an retransmission timeout, which resets
snd_nxt to snd_una while the SACK scoreboard is still populated.

Reviewed By:		tuexen, #transport
PR:			264257
PR:			263445
PR:			260393
MFC after:		3 days
Sponsored by:		NetApp, Inc.
Differential Revision:	https://reviews.freebsd.org/D36637

(cherry picked from commit a743fc8826fa348b09d219632594c537f8e5690e)

Git Hash:   3651c4f42285644938e2f5bc924ab8c7ed857f83
Git Author: rscheff@FreeBSD.org
END