From: Yuchung Cheng <ycheng@google.com>
Date: Mon, 13 Jul 2015 19:10:20 +0000 (-0700)
Subject: tcp: don't use F-RTO on non-recurring timeouts
X-Git-Tag: omap-for-v4.3/fixes-merge-window~206^2~37
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f82b681a511f4d61069e9586a9cf97bdef371ef3;p=pandora-kernel.git

tcp: don't use F-RTO on non-recurring timeouts

Currently F-RTO may repeatedly send new data packets on non-recurring
timeouts in CA_Loss mode. This is a bug because F-RTO (RFC5682)
should only be used on either new recovery or recurring timeouts.

This exacerbates the recovery progress during frequent timeout &
repair, because we prioritize sending new data packets instead of
repairing the holes when the bandwidth is already scarce.

Fix it by correcting the test of a new recovery episode.

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