From patchwork Mon Feb 20 12:53:44 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jisheng Zhang X-Patchwork-Id: 9582723 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 41E816042F for ; Mon, 20 Feb 2017 13:03:47 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 30C31286A0 for ; Mon, 20 Feb 2017 13:03:47 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 240842886D; Mon, 20 Feb 2017 13:03:47 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id B39DC286A0 for ; Mon, 20 Feb 2017 13:03:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=PHQw3+cXp32KV+oCVj07LE3cTsUnpzUTOifA6dh/9Gs=; b=JX4C4UOjiUhm/K Al274ZoTRDZWyAOmlJbQZcAE9EcpvMvQ01OcHmvxWXHIsB78XwWk2EAWX8DdJwog8w0JaaKzRoQBt l69hPyUtVN/C7zNhluublT3hF+rsIRdkakPpnQfG4kHjUlP4n+3fm6wCPopubIw921YiOVigsl8Th EK7v3lhOB1OV8VaP7Z80p1rq5tzkIv/gV44qs5MDHlmasoEqVULkhNuceux7+mdkd5gEIv/QblbYy nGLqbZ4nDBVGEh/d1a6MJWAJsKwhvoez5pqn4ZYKt+lDQdI890FkeL46ScVUVMAWndVUA8OTqJqq8 nP3R1WrJOMUMf7yaU0rg==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1cfnd3-0003A2-HM; Mon, 20 Feb 2017 13:03:45 +0000 Received: from mx0a-0016f401.pphosted.com ([67.231.148.174] helo=mx0b-0016f401.pphosted.com) by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1cfnYN-0007ZV-PB for linux-arm-kernel@lists.infradead.org; Mon, 20 Feb 2017 12:58:58 +0000 Received: from pps.filterd (m0045849.ppops.net [127.0.0.1]) by mx0a-0016f401.pphosted.com (8.16.0.20/8.16.0.20) with SMTP id v1KCpTI6021639; Mon, 20 Feb 2017 04:58:31 -0800 Received: from sc-exch03.marvell.com ([199.233.58.183]) by mx0a-0016f401.pphosted.com with ESMTP id 28ppp1297f-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-SHA384 bits=256 verify=NOT); Mon, 20 Feb 2017 04:58:31 -0800 Received: from SC-EXCH02.marvell.com (10.93.176.82) by SC-EXCH03.marvell.com (10.93.176.83) with Microsoft SMTP Server (TLS) id 15.0.1210.3; Mon, 20 Feb 2017 04:58:30 -0800 Received: from maili.marvell.com (10.93.176.43) by SC-EXCH02.marvell.com (10.93.176.82) with Microsoft SMTP Server id 15.0.1210.3 via Frontend Transport; Mon, 20 Feb 2017 04:58:30 -0800 Received: from xhacker.marvell.com (unknown [10.37.130.223]) by maili.marvell.com (Postfix) with ESMTP id 8EE763F703F; Mon, 20 Feb 2017 04:58:28 -0800 (PST) From: Jisheng Zhang To: , , , , Subject: [PATCH net-next v3 4/4] net: mvneta: Use cacheable memory to store the rx buffer DMA address Date: Mon, 20 Feb 2017 20:53:44 +0800 Message-ID: <20170220125344.3555-5-jszhang@marvell.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20170220125344.3555-1-jszhang@marvell.com> References: <20170220125344.3555-1-jszhang@marvell.com> MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2017-02-20_11:, , signatures=0 X-Proofpoint-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=2 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 impostorscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1612050000 definitions=main-1702200127 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20170220_045855_907071_5F2DB6A4 X-CRM114-Status: GOOD ( 14.15 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Jisheng Zhang , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP In hot code path such as mvneta_rx_swbm(), the buf_phys_addr field of rx_dec is accessed. The rx_desc is allocated by dma_alloc_coherent, it's uncacheable if the device isn't cache coherent, reading from uncached memory is fairly slow. This patch uses cacheable memory to store the rx buffer DMA address. We get the following performance data on Marvell BG4CT Platforms (tested with iperf): before the patch: recving 1GB in mvneta_rx_swbm() costs 1492659600 ns after the patch: recving 1GB in mvneta_rx_swbm() costs 1421565640 ns We saved 4.76% time. Signed-off-by: Jisheng Zhang Suggested-by: Arnd Bergmann --- drivers/net/ethernet/marvell/mvneta.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c index b6cda4131c78..ccd3f2601446 100644 --- a/drivers/net/ethernet/marvell/mvneta.c +++ b/drivers/net/ethernet/marvell/mvneta.c @@ -580,6 +580,9 @@ struct mvneta_rx_queue { /* Virtual address of the RX buffer */ void **buf_virt_addr; + /* DMA address of the RX buffer */ + dma_addr_t *buf_dma_addr; + /* Virtual address of the RX DMA descriptors array */ struct mvneta_rx_desc *descs; @@ -1617,6 +1620,7 @@ static void mvneta_rx_desc_fill(struct mvneta_rx_desc *rx_desc, rx_desc->buf_phys_addr = phys_addr; i = rx_desc - rxq->descs; + rxq->buf_dma_addr[i] = phys_addr; rxq->buf_virt_addr[i] = virt_addr; } @@ -1912,10 +1916,9 @@ static void mvneta_rxq_drop_pkts(struct mvneta_port *pp, } for (i = 0; i < rxq->size; i++) { - struct mvneta_rx_desc *rx_desc = rxq->descs + i; void *data = rxq->buf_virt_addr[i]; - dma_unmap_single(pp->dev->dev.parent, rx_desc->buf_phys_addr, + dma_unmap_single(pp->dev->dev.parent, rxq->buf_dma_addr[i], MVNETA_RX_BUF_SIZE(pp->pkt_size), DMA_FROM_DEVICE); mvneta_frag_free(pp->frag_size, data); } @@ -1953,7 +1956,7 @@ static int mvneta_rx_swbm(struct mvneta_port *pp, int rx_todo, rx_bytes = rx_desc->data_size - (ETH_FCS_LEN + MVNETA_MH_SIZE); index = rx_desc - rxq->descs; data = rxq->buf_virt_addr[index]; - phys_addr = rx_desc->buf_phys_addr; + phys_addr = rxq->buf_dma_addr[index]; if (!mvneta_rxq_desc_is_first_last(rx_status) || (rx_status & MVNETA_RXD_ERR_SUMMARY)) { @@ -4019,7 +4022,10 @@ static int mvneta_init(struct device *dev, struct mvneta_port *pp) rxq->buf_virt_addr = devm_kmalloc(pp->dev->dev.parent, rxq->size * sizeof(void *), GFP_KERNEL); - if (!rxq->buf_virt_addr) + rxq->buf_dma_addr = devm_kmalloc(pp->dev->dev.parent, + rxq->size * sizeof(dma_addr_t), + GFP_KERNEL); + if (!rxq->buf_virt_addr || !rxq->buf_dma_addr) return -ENOMEM; }