netdev - [PATCH v5] tcp: harmonize tcp_vx_rcv header length assumptions

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Message-ID: <4B4F33F3.3000509@gmail.com>
Date:	Thu, 14 Jan 2010 10:10:43 -0500
From:	William Allen Simpson <william.allen.simpson@...il.com>
To:	Linux Kernel Developers <linux-kernel@...r.kernel.org>
CC:	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>,
	Joe Perches <joe@...ches.com>, Andi Kleen <andi@...stfloor.org>
Subject: [PATCH v5] tcp: harmonize tcp_vx_rcv header length assumptions

Harmonize tcp_v4_rcv() and tcp_v6_rcv() -- better document tcp doff
and header length assumptions, and carefully compare implementations.

Reduces multiply/shifts, marginally improving speed.

Removes redundant tcp header length checks before checksumming.

Instead, assumes (and documents) that any backlog processing and
transform policies will carefully preserve the header, and will
ensure the socket buffer length remains >= the header size.

Stand-alone patch, originally developed for TCPCT.

Signed-off-by: William.Allen.Simpson@...il.com
---
  include/net/xfrm.h  |    7 ++++++
  net/ipv4/tcp_ipv4.c |   45 +++++++++++++++++++++-----------------
  net/ipv6/tcp_ipv6.c |   59 ++++++++++++++++++++++++++++----------------------
  3 files changed, 65 insertions(+), 46 deletions(-)

View attachment "len_th+3v5.patch" of type "text/plain" (8038 bytes)