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

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Message-ID: <4B4C4962.8040207@gmail.com>
Date:	Tue, 12 Jan 2010 05:05:22 -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>,
	Andi Kleen <andi@...stfloor.org>
Subject: [PATCH] tcp: harmonize tcp_vx_rcv header length assumptions

Harmonize tcp_v4_rcv() and tcp_v6_rcv() -- better document tcp doff and
header length assumptions.

Reduces multiply/shifts, marginally improving speed.

Retains redundant tcp header length checks before checksumming.

Stand-alone patch, originally developed for TCPCT.

Requires:
   net: tcp_header_len_th and tcp_option_len_th

Signed-off-by: William.Allen.Simpson@...il.com
---
  net/ipv4/tcp_ipv4.c |   36 +++++++++++++++++++-------------
  net/ipv6/tcp_ipv6.c |   56 ++++++++++++++++++++++++++++----------------------
  2 files changed, 52 insertions(+), 40 deletions(-)

View attachment "len_th+3v3.patch" of type "text/plain" (6908 bytes)