From patchwork Thu Nov 18 03:20:10 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhang Chen X-Patchwork-Id: 12625963 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 19840C433F5 for ; Thu, 18 Nov 2021 03:31:13 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id A333E61AAA for ; Thu, 18 Nov 2021 03:31:12 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org A333E61AAA Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=nongnu.org Received: from localhost ([::1]:55308 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mnY8l-0003NI-Dy for qemu-devel@archiver.kernel.org; Wed, 17 Nov 2021 22:31:11 -0500 Received: from eggs.gnu.org ([209.51.188.92]:49158) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mnY86-0002iG-QQ for qemu-devel@nongnu.org; Wed, 17 Nov 2021 22:30:30 -0500 Received: from mga17.intel.com ([192.55.52.151]:40750) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mnY84-0005cc-Dp for qemu-devel@nongnu.org; Wed, 17 Nov 2021 22:30:30 -0500 X-IronPort-AV: E=McAfee;i="6200,9189,10171"; a="214823507" X-IronPort-AV: E=Sophos;i="5.87,243,1631602800"; d="scan'208";a="214823507" Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Nov 2021 19:30:22 -0800 X-IronPort-AV: E=Sophos;i="5.87,243,1631602800"; d="scan'208";a="646265250" Received: from unknown (HELO localhost.localdomain) ([10.239.13.19]) by fmsmga001-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Nov 2021 19:30:21 -0800 From: Zhang Chen To: Jason Wang , Li Zhijian Subject: [PATCH 1/2] net/colo-compare.c: Fix ACK track reverse issue Date: Thu, 18 Nov 2021 11:20:10 +0800 Message-Id: <20211118032011.249517-1-chen.zhang@intel.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Received-SPF: pass client-ip=192.55.52.151; envelope-from=chen.zhang@intel.com; helo=mga17.intel.com X-Spam_score_int: -41 X-Spam_score: -4.2 X-Spam_bar: ---- X-Spam_report: (-4.2 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Zhang Chen , qemu-dev Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" The TCP protocol ACK maybe bigger than uint32_t MAX. At this time, the ACK will reverse to 0. This patch fix the max_ack and min_ack track issue. Signed-off-by: Zhang Chen --- net/colo-compare.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/net/colo-compare.c b/net/colo-compare.c index b8876d7fd9..1225f40e41 100644 --- a/net/colo-compare.c +++ b/net/colo-compare.c @@ -209,7 +209,8 @@ static void fill_pkt_tcp_info(void *data, uint32_t *max_ack) pkt->tcp_seq = ntohl(tcphd->th_seq); pkt->tcp_ack = ntohl(tcphd->th_ack); - *max_ack = *max_ack > pkt->tcp_ack ? *max_ack : pkt->tcp_ack; + /* Need to consider ACK will bigger than uint32_t MAX */ + *max_ack = pkt->tcp_ack - *max_ack > 0 ? pkt->tcp_ack : *max_ack; pkt->header_size = pkt->transport_header - (uint8_t *)pkt->data + (tcphd->th_off << 2); pkt->payload_size = pkt->size - pkt->header_size; @@ -413,7 +414,8 @@ static void colo_compare_tcp(CompareState *s, Connection *conn) * can ensure that the packet's payload is acknowledged by * primary and secondary. */ - uint32_t min_ack = conn->pack > conn->sack ? conn->sack : conn->pack; + uint32_t min_ack = conn->pack - conn->sack > 0 ? + conn->sack : conn->pack; pri: if (g_queue_is_empty(&conn->primary_list)) {