From patchwork Mon Dec 20 05:42:46 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Feifei Wang X-Patchwork-Id: 105269 Return-Path: X-Original-To: patchwork@inbox.dpdk.org Delivered-To: patchwork@inbox.dpdk.org Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by inbox.dpdk.org (Postfix) with ESMTP id B2EEFA034C; Mon, 20 Dec 2021 06:42:57 +0100 (CET) Received: from [217.70.189.124] (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id 392EF40395; Mon, 20 Dec 2021 06:42:57 +0100 (CET) Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by mails.dpdk.org (Postfix) with ESMTP id C2D8F40141 for ; Mon, 20 Dec 2021 06:42:55 +0100 (CET) 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 1A22B1042; Sun, 19 Dec 2021 21:42:55 -0800 (PST) Received: from net-x86-dell-8268.shanghai.arm.com (net-x86-dell-8268.shanghai.arm.com [10.169.210.123]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 7D0483F5A1; Sun, 19 Dec 2021 21:42:52 -0800 (PST) From: Feifei Wang To: Ruifeng Wang , Beilei Xing , Bruce Richardson , Konstantin Ananyev Cc: dev@dpdk.org, nd@arm.com, Feifei Wang , Honnappa Nagarahalli Subject: [PATCH] net/i40e: remove redundant judgment for rearm Date: Mon, 20 Dec 2021 13:42:46 +0800 Message-Id: <20211220054246.4031616-1-feifei.wang2@arm.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Merged variable updates under the same condition. It reduces branch. In n1sdp, there is no performance improvement with this patch. In x86, there is also no performance improvement. Suggested-by: Honnappa Nagarahalli Signed-off-by: Feifei Wang Reviewed-by: Ruifeng Wang --- drivers/net/i40e/i40e_rxtx_vec_neon.c | 9 +++++---- drivers/net/i40e/i40e_rxtx_vec_sse.c | 9 +++++---- 2 files changed, 10 insertions(+), 8 deletions(-) diff --git a/drivers/net/i40e/i40e_rxtx_vec_neon.c b/drivers/net/i40e/i40e_rxtx_vec_neon.c index b951ea2dc3..c7e4222b61 100644 --- a/drivers/net/i40e/i40e_rxtx_vec_neon.c +++ b/drivers/net/i40e/i40e_rxtx_vec_neon.c @@ -64,14 +64,15 @@ i40e_rxq_rearm(struct i40e_rx_queue *rxq) } rxq->rxrearm_start += RTE_I40E_RXQ_REARM_THRESH; - if (rxq->rxrearm_start >= rxq->nb_rx_desc) + rx_id = rxq->rxrearm_start - 1; + + if (unlikely(rxq->rxrearm_start >= rxq->nb_rx_desc)) { rxq->rxrearm_start = 0; + rx_id = rxq->nb_rx_desc - 1; + } rxq->rxrearm_nb -= RTE_I40E_RXQ_REARM_THRESH; - rx_id = (uint16_t)((rxq->rxrearm_start == 0) ? - (rxq->nb_rx_desc - 1) : (rxq->rxrearm_start - 1)); - rte_io_wmb(); /* Update the tail pointer on the NIC */ I40E_PCI_REG_WRITE_RELAXED(rxq->qrx_tail, rx_id); diff --git a/drivers/net/i40e/i40e_rxtx_vec_sse.c b/drivers/net/i40e/i40e_rxtx_vec_sse.c index 497b2404c6..0910039d69 100644 --- a/drivers/net/i40e/i40e_rxtx_vec_sse.c +++ b/drivers/net/i40e/i40e_rxtx_vec_sse.c @@ -77,14 +77,15 @@ i40e_rxq_rearm(struct i40e_rx_queue *rxq) } rxq->rxrearm_start += RTE_I40E_RXQ_REARM_THRESH; - if (rxq->rxrearm_start >= rxq->nb_rx_desc) + rx_id = rxq->rxrearm_start - 1; + + if (unlikely(rxq->rxrearm_start >= rxq->nb_rx_desc)) { rxq->rxrearm_start = 0; + rx_id = rxq->nb_rx_desc - 1; + } rxq->rxrearm_nb -= RTE_I40E_RXQ_REARM_THRESH; - rx_id = (uint16_t)((rxq->rxrearm_start == 0) ? - (rxq->nb_rx_desc - 1) : (rxq->rxrearm_start - 1)); - /* Update the tail pointer on the NIC */ I40E_PCI_REG_WC_WRITE(rxq->qrx_tail, rx_id); }