From patchwork Mon Sep 16 11:27:15 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gavin Hu X-Patchwork-Id: 59278 X-Patchwork-Delegate: ferruh.yigit@amd.com Return-Path: X-Original-To: patchwork@dpdk.org Delivered-To: patchwork@dpdk.org Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 2FB7C1C0B7; Mon, 16 Sep 2019 13:27:39 +0200 (CEST) Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by dpdk.org (Postfix) with ESMTP id 0D60E1C0AF for ; Mon, 16 Sep 2019 13:27:35 +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 12A591000; Mon, 16 Sep 2019 04:27:34 -0700 (PDT) Received: from net-arm-thunderx2-01.test.ast.arm.com (net-arm-thunderx2-01.shanghai.arm.com [10.169.40.40]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id DC8D03F59C; Mon, 16 Sep 2019 04:27:31 -0700 (PDT) From: Gavin Hu To: dev@dpdk.org Cc: nd@arm.com, thomas@monjalon.net, bruce.richardson@intel.com, yong.liu@intel.com, yinan.wang@intel.com, ajit.khaparde@broadcom.com, somnath.kotur@broadcom.com, Honnappa.Nagarahalli@arm.com, ruifeng.wang@arm.com, steve.capper@arm.com Date: Mon, 16 Sep 2019 19:27:15 +0800 Message-Id: <1568633238-47888-3-git-send-email-gavin.hu@arm.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1568633238-47888-1-git-send-email-gavin.hu@arm.com> References: <1568633238-47888-1-git-send-email-gavin.hu@arm.com> In-Reply-To: <1567751873-15964-1-git-send-email-gavin.hu@arm.com> References: <1567751873-15964-1-git-send-email-gavin.hu@arm.com> Subject: [dpdk-dev] [PATCH v2 2/5] net/ice: use relaxed and remove duplicate barrier X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" To guarantee the orderings of successive stores to CIO and MMIO memory, a lighter weight rte_io_wmb [1] can be used instead of rte_wmb, and since the ICE_PCI_REG_WRITE API already has an inclusive rte_io_wmb, this explicit call can even be saved. [1] http://git.dpdk.org/dpdk/tree/lib/librte_eal/common/include/generic/ rte_atomic.h#n98 Signed-off-by: Gavin Hu Acked-by: Qi Zhang --- drivers/net/ice/ice_rxtx.c | 6 ------ 1 file changed, 6 deletions(-) diff --git a/drivers/net/ice/ice_rxtx.c b/drivers/net/ice/ice_rxtx.c index 81af814..2366119 100644 --- a/drivers/net/ice/ice_rxtx.c +++ b/drivers/net/ice/ice_rxtx.c @@ -363,8 +363,6 @@ ice_rx_queue_start(struct rte_eth_dev *dev, uint16_t rx_queue_id) return -ENOMEM; } - rte_wmb(); - /* Init the RX tail register. */ ICE_PCI_REG_WRITE(rxq->qrx_tail, rxq->nb_rx_desc - 1); @@ -1212,7 +1210,6 @@ ice_rx_alloc_bufs(struct ice_rx_queue *rxq) } /* Update rx tail regsiter */ - rte_wmb(); ICE_PCI_REG_WRITE(rxq->qrx_tail, rxq->rx_free_trigger); rxq->rx_free_trigger = @@ -2132,8 +2129,6 @@ ice_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, uint16_t nb_pkts) ICE_TXD_QW1_CMD_S); } end_of_tx: - rte_wmb(); - /* update Tail register */ ICE_PCI_REG_WRITE(txq->qtx_tail, tx_id); txq->tx_tail = tx_id; @@ -2289,7 +2284,6 @@ tx_xmit_pkts(struct ice_tx_queue *txq, txq->tx_tail = 0; /* Update the tx tail register */ - rte_wmb(); ICE_PCI_REG_WRITE(txq->qtx_tail, txq->tx_tail); return nb_pkts;