[Differential] D7415: tcp/lro: If timestamps mismatch or it's a FIN, force flush.

[sepherosa_gmail.com (Sepherosa Ziehau)]

sepherosa_gmail.com created this revision.
sepherosa_gmail.com added reviewers: rrs, gallatin, hselasky, np, glebius.
sepherosa_gmail.com added a subscriber: freebsd-net-list.
Herald added a reviewer: transport.

REVISION SUMMARY
    This keeps the segments/ACK/FIN delivery order.
    
    Before this patch, it was observed: if A sent FIN immediately after
    an ACK, B would deliver FIN first to the TCP stack, then the ACK.
    This out-of-order delivery causes one unnecessary ACK sent from B.
    
    Obtained from:  gallatin, rrs

REVISION DETAIL
  https://reviews.freebsd.org/D7415

AFFECTED FILES
  sys/netinet/tcp_lro.c

EMAIL PREFERENCES
  https://reviews.freebsd.org/settings/panel/emailpreferences/

To: sepherosa_gmail.com, #transport, rrs, gallatin, hselasky, np, glebius
Cc: freebsd-net-list
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