From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by inbox.dpdk.org (Postfix) with ESMTP id 7B9ECA0549; Thu, 16 Jul 2020 14:34:09 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 9D6551C43F; Thu, 16 Jul 2020 14:32:57 +0200 (CEST) Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) by dpdk.org (Postfix) with ESMTP id C53D11C2B8 for ; Thu, 16 Jul 2020 14:32:54 +0200 (CEST) IronPort-SDR: t3uaaKqquLtzsNu2KGkoU5hOIUK94u7ElZQb/wiydMyipL+lLb6kbytBZS4wFkPyXTPWPTOSNv hxQfl1fImQlg== X-IronPort-AV: E=McAfee;i="6000,8403,9683"; a="234224374" X-IronPort-AV: E=Sophos;i="5.75,359,1589266800"; d="scan'208";a="234224374" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga006.jf.intel.com ([10.7.209.51]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Jul 2020 05:32:53 -0700 IronPort-SDR: xk/ofNt7kwgkk5TZLYc1kaEsLohYGhCbbx2eU1iCFuTp7J60mfOKE5U03EpeyS1iFQ9M/okBNg 914DQuoPNrYg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.75,359,1589266800"; d="scan'208";a="286466709" Received: from silpixa00383879.ir.intel.com ([10.237.222.142]) by orsmga006.jf.intel.com with ESMTP; 16 Jul 2020 05:32:51 -0700 From: Radu Nicolau To: dev@dpdk.org Cc: beilei.xing@intel.com, jia.guo@intel.com, bruce.richardson@intel.com, konstantin.ananyev@intel.com, jerinjacobk@gmail.com, david.marchand@redhat.com, fiona.trahe@intel.com, wei.zhao1@intel.com, ruifeng.wang@arm.com, Radu Nicolau Date: Thu, 16 Jul 2020 13:29:16 +0100 Message-Id: <1594902556-19511-5-git-send-email-radu.nicolau@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1594902556-19511-1-git-send-email-radu.nicolau@intel.com> References: <1591870283-7776-1-git-send-email-radu.nicolau@intel.com> <1594902556-19511-1-git-send-email-radu.nicolau@intel.com> Subject: [dpdk-dev] [PATCH v7 4/4] net/ixgbe: use WC store to update doorbell register 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" Performance improvement: use a write combining store instead of a regular mmio write to update queue tail registers. Signed-off-by: Radu Nicolau --- drivers/net/ixgbe/base/ixgbe_osdep.h | 6 ++++++ drivers/net/ixgbe/ixgbe_rxtx.c | 4 ++-- drivers/net/ixgbe/ixgbe_rxtx_vec_sse.c | 4 ++-- 3 files changed, 10 insertions(+), 4 deletions(-) diff --git a/drivers/net/ixgbe/base/ixgbe_osdep.h b/drivers/net/ixgbe/base/ixgbe_osdep.h index dc712b7..cacf724 100644 --- a/drivers/net/ixgbe/base/ixgbe_osdep.h +++ b/drivers/net/ixgbe/base/ixgbe_osdep.h @@ -105,6 +105,12 @@ static inline uint32_t ixgbe_read_addr(volatile void* addr) #define IXGBE_PCI_REG_WRITE_RELAXED(reg, value) \ rte_write32_relaxed((rte_cpu_to_le_32(value)), reg) +#define IXGBE_PCI_REG_WC_WRITE(reg, value) \ + rte_write32_wc((rte_cpu_to_le_32(value)), reg) + +#define IXGBE_PCI_REG_WC_WRITE_RELAXED(reg, value) \ + rte_write32_wc_relaxed((rte_cpu_to_le_32(value)), reg) + #define IXGBE_PCI_REG_ADDR(hw, reg) \ ((volatile uint32_t *)((char *)(hw)->hw_addr + (reg))) diff --git a/drivers/net/ixgbe/ixgbe_rxtx.c b/drivers/net/ixgbe/ixgbe_rxtx.c index 2e20e18..06e8dd5 100644 --- a/drivers/net/ixgbe/ixgbe_rxtx.c +++ b/drivers/net/ixgbe/ixgbe_rxtx.c @@ -308,7 +308,7 @@ tx_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts, /* update tail pointer */ rte_wmb(); - IXGBE_PCI_REG_WRITE_RELAXED(txq->tdt_reg_addr, txq->tx_tail); + IXGBE_PCI_REG_WC_WRITE_RELAXED(txq->tdt_reg_addr, txq->tx_tail); return nb_pkts; } @@ -1918,7 +1918,7 @@ ixgbe_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, (unsigned) nb_rx); rx_id = (uint16_t) ((rx_id == 0) ? (rxq->nb_rx_desc - 1) : (rx_id - 1)); - IXGBE_PCI_REG_WRITE(rxq->rdt_reg_addr, rx_id); + IXGBE_PCI_REG_WC_WRITE(rxq->rdt_reg_addr, rx_id); nb_hold = 0; } rxq->nb_rx_hold = nb_hold; diff --git a/drivers/net/ixgbe/ixgbe_rxtx_vec_sse.c b/drivers/net/ixgbe/ixgbe_rxtx_vec_sse.c index 517ca31..e77a7f3 100644 --- a/drivers/net/ixgbe/ixgbe_rxtx_vec_sse.c +++ b/drivers/net/ixgbe/ixgbe_rxtx_vec_sse.c @@ -90,7 +90,7 @@ ixgbe_rxq_rearm(struct ixgbe_rx_queue *rxq) (rxq->nb_rx_desc - 1) : (rxq->rxrearm_start - 1)); /* Update the tail pointer on the NIC */ - IXGBE_PCI_REG_WRITE(rxq->rdt_reg_addr, rx_id); + IXGBE_PCI_REG_WC_WRITE(rxq->rdt_reg_addr, rx_id); } #ifdef RTE_LIBRTE_SECURITY @@ -697,7 +697,7 @@ ixgbe_xmit_fixed_burst_vec(void *tx_queue, struct rte_mbuf **tx_pkts, txq->tx_tail = tx_id; - IXGBE_PCI_REG_WRITE(txq->tdt_reg_addr, txq->tx_tail); + IXGBE_PCI_REG_WC_WRITE(txq->tdt_reg_addr, txq->tx_tail); return nb_pkts; } -- 2.7.4