FROMGIT: tcp: Update window clamping condition

This patch is based on the discussions between Neal Cardwell and
Eric Dumazet in the link
https://lore.kernel.org/netdev/20240726204105.1466841-1-quic_subashab@quicinc.com/



It was correctly pointed out that tp->window_clamp would not be
updated in cases where net.ipv4.tcp_moderate_rcvbuf=0 or if
(copied <= tp->rcvq_space.space). While it is expected for most
setups to leave the sysctl enabled, the latter condition may
not end up hitting depending on the TCP receive queue size and
the pattern of arriving data.

The updated check should be hit only on initial MSS update from
TCP_MIN_MSS to measured MSS value and subsequently if there was
an update to a larger value.

Bug: 359923259
Fixes: 05f76b2d ("tcp: Adjust clamping window for applications specifying SO_RCVBUF")
Change-Id: Id61e93bdfc7bc3a60898551b63c4a751e899871e
Signed-off-by: Sean Tranchetti <quic_stranche@quicinc.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit a2cbb160
https: //git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git main)
Signed-off-by: Subash Abhinov Kasiviswanathan <quic_subashab@quicinc.com>