From patchwork Wed Jun 9 13:47:14 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Matteo Croce X-Patchwork-Id: 12310153 X-Patchwork-Delegate: kuba@kernel.org Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D240FC48BCF for ; Wed, 9 Jun 2021 13:48:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BDF7C61364 for ; Wed, 9 Jun 2021 13:48:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236624AbhFINuO (ORCPT ); Wed, 9 Jun 2021 09:50:14 -0400 Received: from mail-wr1-f51.google.com ([209.85.221.51]:45611 "EHLO mail-wr1-f51.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232911AbhFINuJ (ORCPT ); Wed, 9 Jun 2021 09:50:09 -0400 Received: by mail-wr1-f51.google.com with SMTP id z8so25531988wrp.12; Wed, 09 Jun 2021 06:48:14 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=ob6PnWhKav7jMFqFY+b+WTV4eaWghvwiq60OTVa4u2A=; b=GYHSeZPo34jeBLHh/sCUIdxO1hQZh36/JnIyZDl0LES2nd23mJwjBw3GSlGkBfOQJx sR8vGgFXr+jt+aMIR3dvvAzZep2RdTIGtGjLZvB3GlJvlqUzG+i/DqPfqKxVlRzKa1uk J36X2QQ6rlpPy7AplDQ2dosl9aMrEG09mPl7Q+XmVpFkqbKpo7wMxl92lPHZh8FtmEy4 dGp+t+CIoXh6d23izgxdotfQbERpnyTbftiFvEbGT2bMUlPmHghsM4A+/kpVvznSG+sN aF1TRHZbn0luDb5XzVQ8ZDLG4VdQLFrGjJR1DT/UBDcFLBwbpjMbu7kF/uwYtgJv8RC8 nZSA== X-Gm-Message-State: AOAM5301qvP4bTOAQxGu0WjirDJp039bqUg1hk8u7UdQPR/0JcdETMxT yGVYEChX2yKpqdLfGYCm8uRPsMBkht+EXg== X-Google-Smtp-Source: ABdhPJyaQfaop0D//baox/2aMwkJjAdH0+kRl4J2HwWcdWYJxkqS9EQfqvwqrw4W6zuMhvoxcFMRZw== X-Received: by 2002:adf:f78d:: with SMTP id q13mr27990870wrp.191.1623246493659; Wed, 09 Jun 2021 06:48:13 -0700 (PDT) Received: from msft-t490s.teknoraver.net (net-37-119-128-179.cust.vodafonedsl.it. [37.119.128.179]) by smtp.gmail.com with ESMTPSA id o5sm13882351wrw.65.2021.06.09.06.48.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 09 Jun 2021 06:48:13 -0700 (PDT) From: Matteo Croce To: netdev@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Marcin Wojtas , Russell King , "David S. Miller" , Jakub Kicinski , Sven Auhagen Subject: [PATCH net-next 2/2] mvpp2: prefetch page Date: Wed, 9 Jun 2021 15:47:14 +0200 Message-Id: <20210609134714.13715-3-mcroce@linux.microsoft.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210609134714.13715-1-mcroce@linux.microsoft.com> References: <20210609134714.13715-1-mcroce@linux.microsoft.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org From: Matteo Croce Most of the time during the RX is caused by the compound_head() call done at the end of the RX loop: │ build_skb(): [...] │ static inline struct page *compound_head(struct page *page) │ { │ unsigned long head = READ_ONCE(page->compound_head); 65.23 │ ldr x2, [x1, #8] Prefetch the page struct as soon as possible, to speedup the RX path noticeabily by a ~3-4% packet rate in a drop test. │ build_skb(): [...] │ static inline struct page *compound_head(struct page *page) │ { │ unsigned long head = READ_ONCE(page->compound_head); 17.92 │ ldr x2, [x1, #8] Signed-off-by: Matteo Croce --- drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c index 07d8f3e31b52..9bca8c8f9f8d 100644 --- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c +++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c @@ -3900,15 +3900,19 @@ static int mvpp2_rx(struct mvpp2_port *port, struct napi_struct *napi, phys_addr_t phys_addr; u32 rx_status, timestamp; int pool, rx_bytes, err, ret; + struct page *page; void *data; + phys_addr = mvpp2_rxdesc_cookie_get(port, rx_desc); + data = (void *)phys_to_virt(phys_addr); + page = virt_to_page(data); + prefetch(page); + rx_done++; rx_status = mvpp2_rxdesc_status_get(port, rx_desc); rx_bytes = mvpp2_rxdesc_size_get(port, rx_desc); rx_bytes -= MVPP2_MH_SIZE; dma_addr = mvpp2_rxdesc_dma_addr_get(port, rx_desc); - phys_addr = mvpp2_rxdesc_cookie_get(port, rx_desc); - data = (void *)phys_to_virt(phys_addr); pool = (rx_status & MVPP2_RXD_BM_POOL_ID_MASK) >> MVPP2_RXD_BM_POOL_ID_OFFS; @@ -3997,7 +4001,7 @@ static int mvpp2_rx(struct mvpp2_port *port, struct napi_struct *napi, } if (pp) - skb_mark_for_recycle(skb, virt_to_page(data), pp); + skb_mark_for_recycle(skb, page, pp); else dma_unmap_single_attrs(dev->dev.parent, dma_addr, bm_pool->buf_size, DMA_FROM_DEVICE,