Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756513Ab0BJVLW (ORCPT ); Wed, 10 Feb 2010 16:11:22 -0500 Received: from mail-iw0-f185.google.com ([209.85.223.185]:52888 "EHLO mail-iw0-f185.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756365Ab0BJVLR (ORCPT ); Wed, 10 Feb 2010 16:11:17 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:user-agent:mime-version:to:cc:subject :references:in-reply-to:content-type; b=ZtHywmYewqqbnCtmNCCC66irVs08RlwrvvX1epoAo9dIS4F/iSGZYZXn4J0oq+kumO tiFBJBYMpmWxdjMJHAZu3PrevEhrNAnRyUz0QfEFPA9c5O+PMwHuicM/LudvNSlFggo5 wnLoe1E5tXun28HTOZ5qUXmb4wlG685KA6Dtw= Message-ID: <4B7320F2.7070104@gmail.com> Date: Wed, 10 Feb 2010 16:11:14 -0500 From: William Allen Simpson User-Agent: Thunderbird 2.0.0.23 (Macintosh/20090812) MIME-Version: 1.0 To: Linux Kernel Developers , Linux Kernel Network Developers CC: Andrew Morton , Andi Kleen Subject: [PATCH v5 3/6] tcp: harmonize tcp_vx_rcv header length assumptions References: <4B731D61.2080603@gmail.com> In-Reply-To: <4B731D61.2080603@gmail.com> Content-Type: multipart/mixed; boundary="------------020003050908000803020200" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 12396 Lines: 188 This is a multi-part message in MIME format. --------------020003050908000803020200 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit 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@gmail.com CC: Andi Kleen --- include/net/xfrm.h | 7 ++++++ net/ipv4/tcp_ipv4.c | 45 +++++++++++++++++++++----------------- net/ipv6/tcp_ipv6.c | 59 ++++++++++++++++++++++++++++---------------------- 3 files changed, 65 insertions(+), 46 deletions(-) --------------020003050908000803020200 Content-Type: text/plain; x-mac-type="54455854"; x-mac-creator="0"; name="len_th+2c5+2.6.33-rc7.patch" Content-Transfer-Encoding: base64 Content-Disposition: inline; filename="len_th+2c5+2.6.33-rc7.patch" ZGlmZiAtLWdpdCBhL2luY2x1ZGUvbmV0L3hmcm0uaCBiL2luY2x1ZGUvbmV0L3hmcm0uaApp bmRleCA2MGMyNzcwLi44MTQ5MmExIDEwMDY0NAotLS0gYS9pbmNsdWRlL25ldC94ZnJtLmgK KysrIGIvaW5jbHVkZS9uZXQveGZybS5oCkBAIC05NzUsNiArOTc1LDEzIEBAIHhmcm1fc3Rh dGVfYWRkcl9jbXAoc3RydWN0IHhmcm1fdG1wbCAqdG1wbCwgc3RydWN0IHhmcm1fc3RhdGUg KngsIHVuc2lnbmVkIHNob3J0CiB9CiAKICNpZmRlZiBDT05GSUdfWEZSTQorLyoKKyAqIEZv ciB0cmFuc3BvcnQsIHRoZSBwb2xpY3kgaXMgY2hlY2tlZCBiZWZvcmUgdGhlIHByZXN1bWVk 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