CVS commit: [netbsd-9] src/sys/netinet

["Martin Husemann" <martin%netbsd.org@localhost>]

Module Name:    src
Committed By:   martin
Date:           Thu Sep  3 13:38:29 UTC 2020

Modified Files:
        src/sys/netinet [netbsd-9]: tcp_input.c

Log Message:
Pull up following revision(s) (requested by kardel in ticket #1074):

        sys/netinet/tcp_input.c: revision 1.419

Fix fast path for uni directional transfers

pure ACK case:
drag snd_wl2 along so only newer
ACKs can update the window size.

also avoids the state where snd_wl2
is eventually larger than th_ack and thus
blocking the window update mechanism and
the connection gets stuck for a loooong
time in the zero sized send window state.

see PR/kern 55567

ok thorpej@, also found in FreeBSD


To generate a diff of this commit:
cvs rdiff -u -r1.414.2.2 -r1.414.2.3 src/sys/netinet/tcp_input.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.