From: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Date: Fri, 16 Nov 2007 03:35:11 +0000 (-0800)
Subject: [TCP]: Extend reordering detection to cover CA_Loss partially
X-Git-Tag: v2.6.25-rc1~1162^2~1424
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f577111302677e6d1448475821cc19ba8835f60e;p=pandora-kernel.git

[TCP]: Extend reordering detection to cover CA_Loss partially

This implements more accurately what is stated in sacktag's
overall comment:

  "Both of these heuristics are not used in Loss state, when
   we cannot account for retransmits accurately."

When CA_Loss state is entered, the state changer ensures that
undo_marker is only set if no TCPCB_RETRANS skbs were found,
thus having non-zero undo_marker in CA_Loss basically tells
that the R-bits still accurately reflect the current state
of TCP.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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