[Bug 235256] [net] IW10 without ABC leads to initial window of 11 Segments

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235256

--- Comment #9 from commit-hook at freebsd.org ---
A commit references this bug:

Author: rscheff
Date: Thu May 21 19:46:12 UTC 2020
New revision: 361342
URL: https://svnweb.freebsd.org/changeset/base/361342

Log:
  MFC r360477: Correctly set up the initial TCP congestion window in all cases

  by not including the SYN bit sequence space in cwnd related calculations.
  Snd_und is adjusted explicitly in all cases, outside the cwnd update,
instead.

  This fixes an off-by-one conformance issue with regular TCP sessions
  not  using Appropriate Byte Counting (RFC3465), sending one more
  packet during  the initial window than expected.

  PR:           235256
  Reviewed by:  tuexen (mentor), rgrimes (mentor, blanket)
  Approved by:  tuexen (mentor), rgrimes (mentor, blanket)
  MFC after:    3 weeks
  Sponsored by: NetApp, Inc.
  Differential Revision:        https://reviews.freebsd.org/D19000

Changes:
_U  stable/12/
  stable/12/sys/netinet/tcp_input.c
  stable/12/sys/netinet/tcp_stacks/rack.c

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