path: root/net/core/dev.c
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authorNeal Cardwell <ncardwell@google.com>2015-04-01 20:26:46 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-04-29 10:31:46 +0200
commite6250f868ccc8a609c88524a785a6e0d915ad3cb (patch)
treea2bce9e1b6981ae2b6406fe0981d2d9f46b0d065 /net/core/dev.c
parent01f69adac109867f892f12057660d891b34182f6 (diff)
tcp: fix FRTO undo on cumulative ACK of SACKed range
[ Upstream commit 666b805150efd62f05810ff0db08f44a2370c937 ] 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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/core/dev.c')
0 files changed, 0 insertions, 0 deletions