From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: <stable-bounces@dpdk.org> Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by inbox.dpdk.org (Postfix) with ESMTP id 0177FA0C4E for <public@inbox.dpdk.org>; Mon, 6 Sep 2021 05:32:20 +0200 (CEST) Received: from [217.70.189.124] (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id E6B98410ED; Mon, 6 Sep 2021 05:32:19 +0200 (CEST) Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by mails.dpdk.org (Postfix) with ESMTP id 6FD4140C35; Mon, 6 Sep 2021 05:32:17 +0200 (CEST) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id C7A04D6E; Sun, 5 Sep 2021 20:32:16 -0700 (PDT) Received: from net-arm-n1amp-02.shanghai.arm.com (net-arm-n1amp-02.shanghai.arm.com [10.169.210.110]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 62F293F5A1; Sun, 5 Sep 2021 20:32:13 -0700 (PDT) From: Ruifeng Wang <ruifeng.wang@arm.com> To: dev@dpdk.org Cc: beilei.xing@intel.com, qi.z.zhang@intel.com, bruce.richardson@intel.com, jerinj@marvell.com, hemant.agrawal@nxp.com, drc@linux.vnet.ibm.com, honnappa.nagarahalli@arm.com, stable@dpdk.org, nd@arm.com, Ruifeng Wang <ruifeng.wang@arm.com> Date: Mon, 6 Sep 2021 11:31:59 +0800 Message-Id: <20210906033201.1789796-1-ruifeng.wang@arm.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Subject: [dpdk-stable] [PATCH 0/2] i40e Rx descriptor loads ordering X-BeenThere: stable@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: patches for DPDK stable branches <stable.dpdk.org> List-Unsubscribe: <https://mails.dpdk.org/options/stable>, <mailto:stable-request@dpdk.org?subject=unsubscribe> List-Archive: <http://mails.dpdk.org/archives/stable/> List-Post: <mailto:stable@dpdk.org> List-Help: <mailto:stable-request@dpdk.org?subject=help> List-Subscribe: <https://mails.dpdk.org/listinfo/stable>, <mailto:stable-request@dpdk.org?subject=subscribe> Errors-To: stable-bounces@dpdk.org Sender: "stable" <stable-bounces@dpdk.org> On Rx path, NIC fills Rx descriptor with data pertains to received packet. A single descriptor consists of multiple words. Word1 has the bit that indicates readiness of descriptor for software to use. So word1 should be loaded before other words. On architectures with weaker memory ordering, barrier is needed to ensure the ordering of loads. This patch set fixed the risk on both scalar path and aarch64 vector path. Ruifeng Wang (2): net/i40e: fix risk in Rx descriptor read in NEON vector path net/i40e: fix risk in Rx descriptor read in scalar path drivers/net/i40e/i40e_rxtx.c | 12 ++++++++++++ drivers/net/i40e/i40e_rxtx_vec_neon.c | 8 ++++++++ 2 files changed, 20 insertions(+) -- 2.25.1