Some applications (like selftests/net/tcp_mmap.c) call SO_RCVLOWAT
on their listener, before accept().
This has an unfortunate effect on wscale selection in
tcp_select_initial_window() during 3WHS.
For instance, tcp_mmap was negotiating wscale 4, regardless
of tcp_rmem[2] and sysctl_rmem_max.
Do not change tp->window_clamp if it is zero
or bigger than our computed value.
Zero value is special, it allows tcp_select_initial_window()
to enable autotuning.
Note that SO_RCVLOWAT use on listener is probably not wise,
because tp->scaling_ratio has a default value, possibly wrong.
Fixes: d1361840f8 ("tcp: fix SO_RCVLOWAT and RCVBUF autotuning")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>
Reviewed-by: Neal Cardwell <ncardwell@google.com>
Link: https://patch.msgid.link/20251003184119.2526655-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
21b29e74ff