From patchwork Mon Oct 17 08:23:32 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Qi Zhang X-Patchwork-Id: 16657 X-Patchwork-Delegate: bruce.richardson@intel.com Return-Path: X-Original-To: patchwork@dpdk.org Delivered-To: patchwork@dpdk.org Received: from [92.243.14.124] (localhost [IPv6:::1]) by dpdk.org (Postfix) with ESMTP id 2CB136CC3; Mon, 17 Oct 2016 17:26:01 +0200 (CEST) Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by dpdk.org (Postfix) with ESMTP id 9E31C6CBC for ; Mon, 17 Oct 2016 17:25:58 +0200 (CEST) Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga103.fm.intel.com with ESMTP; 17 Oct 2016 08:25:58 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos; i="5.31,357,1473145200"; d="scan'208"; a="1055022043" Received: from unknown (HELO localhost.localdomain.sh.intel.com) ([10.239.129.103]) by fmsmga001.fm.intel.com with ESMTP; 17 Oct 2016 08:25:54 -0700 From: Qi Zhang To: jingjing.wu@intel.com, helin.zhang@intel.com Cc: dev@dpdk.org, Qi Zhang Date: Mon, 17 Oct 2016 16:23:32 +0800 Message-Id: <1476692614-35793-2-git-send-email-qi.z.zhang@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1476692614-35793-1-git-send-email-qi.z.zhang@intel.com> References: <1476692614-35793-1-git-send-email-qi.z.zhang@intel.com> Subject: [dpdk-dev] [PATCH 1/3] net/i40e: fix out of order rx read issue X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" Volatile point has been cast to non-volatile point when call _mm_loadu_si128, so add compile barrier to prevent compiler reorder. Fixes: 9ed94e5bb04e ("i40e: add vector Rx") Signed-off-by: Qi Zhang --- drivers/net/i40e/i40e_rxtx_vec.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/net/i40e/i40e_rxtx_vec.c b/drivers/net/i40e/i40e_rxtx_vec.c index 0ee0241..ab63501 100644 --- a/drivers/net/i40e/i40e_rxtx_vec.c +++ b/drivers/net/i40e/i40e_rxtx_vec.c @@ -305,6 +305,7 @@ _recv_raw_pkts_vec(struct i40e_rx_queue *rxq, struct rte_mbuf **rx_pkts, /* Read desc statuses backwards to avoid race condition */ /* A.1 load 4 pkts desc */ descs[3] = _mm_loadu_si128((__m128i *)(rxdp + 3)); + rte_compiler_barrier(); /* B.2 copy 2 mbuf point into rx_pkts */ _mm_storeu_si128((__m128i *)&rx_pkts[pos], mbp1); @@ -313,8 +314,10 @@ _recv_raw_pkts_vec(struct i40e_rx_queue *rxq, struct rte_mbuf **rx_pkts, mbp2 = _mm_loadu_si128((__m128i *)&sw_ring[pos+2]); descs[2] = _mm_loadu_si128((__m128i *)(rxdp + 2)); + rte_compiler_barrier(); /* B.1 load 2 mbuf point */ descs[1] = _mm_loadu_si128((__m128i *)(rxdp + 1)); + rte_compiler_barrier(); descs[0] = _mm_loadu_si128((__m128i *)(rxdp)); /* B.2 copy 2 mbuf point into rx_pkts */