tree e3c233a4a6ce5a2f77bad3365ea9bbaf739b3f36
parent 8a8a894ebbc23f52669b80c2ca5bf62d75267324
author Yuchung Cheng <ycheng@google.com> 1533832689 -0700
committer David S. Miller <davem@davemloft.net> 1534012295 -0700

tcp: mandate a one-time immediate ACK

Add a new flag to indicate a one-time immediate ACK. This flag is
occasionaly set under specific TCP protocol states in addition to
the more common quickack mechanism for interactive application.

In several cases in the TCP code we want to force an immediate ACK
but do not want to call tcp_enter_quickack_mode() because we do
not want to forget the icsk_ack.pingpong or icsk_ack.ato state.

Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Wei Wang <weiwan@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>