From nobody Thu Nov 6 19:14:05 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zoho.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 148825417433298.96445271443633; Mon, 27 Feb 2017 19:56:14 -0800 (PST) Received: from localhost ([::1]:58384 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ciYtZ-0006Jo-2M for importer@patchew.org; Mon, 27 Feb 2017 22:56:13 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:43503) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ciYsI-0005ez-Ck for qemu-devel@nongnu.org; Mon, 27 Feb 2017 22:54:55 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ciYsF-0004D2-Kw for qemu-devel@nongnu.org; Mon, 27 Feb 2017 22:54:54 -0500 Received: from [45.249.212.188] (port=2946 helo=dggrg02-dlp.huawei.com) by eggs.gnu.org with esmtps (TLS1.0:RSA_ARCFOUR_SHA1:16) (Exim 4.71) (envelope-from ) id 1ciYsF-0004B8-1A for qemu-devel@nongnu.org; Mon, 27 Feb 2017 22:54:51 -0500 Received: from 172.30.72.54 (EHLO DGGEML403-HUB.china.huawei.com) ([172.30.72.54]) by dggrg02-dlp.huawei.com (MOS 4.4.6-GA FastPath queued) with ESMTP id AJC73636; Tue, 28 Feb 2017 11:54:43 +0800 (CST) Received: from localhost (10.177.24.212) by DGGEML403-HUB.china.huawei.com (10.3.17.33) with Microsoft SMTP Server id 14.3.301.0; Tue, 28 Feb 2017 11:54:30 +0800 From: zhanghailiang To: , Date: Tue, 28 Feb 2017 11:54:19 +0800 Message-ID: <1488254059-22716-3-git-send-email-zhang.zhanghailiang@huawei.com> X-Mailer: git-send-email 2.7.2.windows.1 In-Reply-To: <1488254059-22716-1-git-send-email-zhang.zhanghailiang@huawei.com> References: <1488254059-22716-1-git-send-email-zhang.zhanghailiang@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.177.24.212] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A020201.58B4F484.0262, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=0.0.0.0, so=2014-11-16 11:51:01, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: e75d05caea57dec65c4e7bf6dd701799 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.4.x-2.6.x [generic] [fuzzy] X-Received-From: 45.249.212.188 Subject: [Qemu-devel] [PATCH v3 2/2] filter-rewriter: skip net_checksum_calculate() while offset = 0 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-devel@nongnu.org, zhanghailiang Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" While the offset of packets's sequence for primary side and secondary side is zero, it is unnecessary to call net_checksum_calculate() to recalculate the checksume value of packets. Signed-off-by: zhanghailiang --- net/filter-rewriter.c | 17 +++++++++++------ 1 file changed, 11 insertions(+), 6 deletions(-) diff --git a/net/filter-rewriter.c b/net/filter-rewriter.c index c4ab91c..afa06e8 100644 --- a/net/filter-rewriter.c +++ b/net/filter-rewriter.c @@ -93,10 +93,12 @@ static int handle_primary_tcp_pkt(NetFilterState *nf, conn->offset -=3D (ntohl(tcp_pkt->th_ack) - 1); conn->syn_flag =3D 0; } - /* handle packets to the secondary from the primary */ - tcp_pkt->th_ack =3D htonl(ntohl(tcp_pkt->th_ack) + conn->offset); + if (conn->offset) { + /* handle packets to the secondary from the primary */ + tcp_pkt->th_ack =3D htonl(ntohl(tcp_pkt->th_ack) + conn->offse= t); =20 - net_checksum_calculate((uint8_t *)pkt->data, pkt->size); + net_checksum_calculate((uint8_t *)pkt->data, pkt->size); + } } =20 return 0; @@ -129,10 +131,13 @@ static int handle_secondary_tcp_pkt(NetFilterState *n= f, } =20 if ((tcp_pkt->th_flags & (TH_ACK | TH_SYN)) =3D=3D TH_ACK) { - /* handle packets to the primary from the secondary*/ - tcp_pkt->th_seq =3D htonl(ntohl(tcp_pkt->th_seq) - conn->offset); + /* Only need to adjust seq while offset is Non-zero */ + if (conn->offset) { + /* handle packets to the primary from the secondary*/ + tcp_pkt->th_seq =3D htonl(ntohl(tcp_pkt->th_seq) - conn->offse= t); =20 - net_checksum_calculate((uint8_t *)pkt->data, pkt->size); + net_checksum_calculate((uint8_t *)pkt->data, pkt->size); + } } =20 return 0; --=20 1.8.3.1