From: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Date: Thu, 22 Feb 2007 07:11:57 +0000 (-0800)
Subject: [TCP] FRTO: Reverse RETRANS bit clearing logic
X-Git-Tag: v2.6.22-rc1~1128^2~434
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d1a54c6a0a3f9c2c4ef71982d89b8571bd9eaa51;p=pandora-kernel.git

[TCP] FRTO: Reverse RETRANS bit clearing logic

Previously RETRANS bits were cleared on the entry to FRTO. We
postpone that into tcp_enter_frto_loss, which is really the
place were the clearing should be done anyway. This allows
simplification of the logic from a clearing loop to the head skb
clearing only.

Besides, the other changes made in the previous patches to
tcp_use_frto made it impossible for the non-SACKed FRTO to be
entered if other than the head has been rexmitted.

With SACK-enhanced FRTO (and Appendix B), however, there can be
a number retransmissions in flight when RTO expires (same thing
could happen before this patchset also with non-SACK FRTO). To
not introduce any jumpiness into the packet counting during FRTO,
instead of clearing RETRANS bits from skbs during entry, do it
later on.

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

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