https://github.com/torvalds/linux
Revision 666b805150efd62f05810ff0db08f44a2370c937 authored by Neal Cardwell on 02 April 2015, 00:26:46 UTC, committed by David S. Miller on 02 April 2015, 20:35:58 UTC
On processing cumulative ACKs, the FRTO code was not checking the
SACKed bit, meaning that there could be a spurious FRTO undo on a
cumulative ACK of a previously SACKed skb.

The FRTO code should only consider a cumulative ACK to indicate that
an original/unretransmitted skb is newly ACKed if the skb was not yet
SACKed.

The effect of the spurious FRTO undo would typically be to make the
connection think that all previously-sent packets were in flight when
they really weren't, leading to a stall and an RTO.

Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Yuchung Cheng <ycheng@google.com>
Fixes: e33099f96d99c ("tcp: implement RFC5682 F-RTO")
Signed-off-by: David S. Miller <davem@davemloft.net>
1 parent 0c36820
History
Tip revision: 666b805150efd62f05810ff0db08f44a2370c937 authored by Neal Cardwell on 02 April 2015, 00:26:46 UTC
tcp: fix FRTO undo on cumulative ACK of SACKed range
Tip revision: 666b805
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