tree e28001900a9bb89adc7de5cd4145157d3e7aafea
parent 6a63df46a7363833a0dc0c431027f522b3487972
author Yuchung Cheng <ycheng@google.com> 1369837213 +0000
committer David S. Miller <davem@davemloft.net> 1369962371 -0700

tcp: fix undo on partial ack in recovery

Upon detecting spurious fast retransmit via timestamps during recovery,
use PRR to clock out new data packet instead of retransmission. Once
all retransmission are proven spurious, the sender then reverts the
cwnd reduction and congestion state to open or disorder.

The current code does the opposite: it undoes cwnd as soon as any
retransmission is spurious and continues to retransmit until all
data are acked. This nullifies the point to undo the cwnd because
the sender is still retransmistting spuriously. This patch fixes
it. The undo_ssthresh argument of tcp_undo_cwnd_reductiuon() is no
longer needed and is removed.

Signed-off-by: Yuchung Cheng <ycheng@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>