From patchwork Mon Jan 11 18:07:42 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Loic Poulain X-Patchwork-Id: 12011353 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=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, 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 4EF6AC433E6 for ; Mon, 11 Jan 2021 18:01:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2103922B51 for ; Mon, 11 Jan 2021 18:01:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390095AbhAKSAu (ORCPT ); Mon, 11 Jan 2021 13:00:50 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54900 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389642AbhAKSAu (ORCPT ); Mon, 11 Jan 2021 13:00:50 -0500 Received: from mail-wr1-x430.google.com (mail-wr1-x430.google.com [IPv6:2a00:1450:4864:20::430]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B581CC0617A2 for ; Mon, 11 Jan 2021 10:00:09 -0800 (PST) Received: by mail-wr1-x430.google.com with SMTP id d26so658512wrb.12 for ; Mon, 11 Jan 2021 10:00:09 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=o6VGoAvdQqK2Elm/WglYXBR1TIROqoxTQR1mS7lNbWE=; b=aLk7IIrYOoT9OrCVSPE3z2FFJ1Xk5rl6flPGwWw+SVoHZR9jZCqnS3nY2Bez/LTD7n AJDxaBpmCuGzCaat+TV9ATjpIOyHfTNHXTMHCmeFJofwk3QqOcV9eTrMoSLp9cwggKIa 2Nts+5CNIgS+frKqiYBujR7DzUK7KjOJaF50LJFXzI//pb8eoFpPiT9fUD9C+ddjJ4nU /GWSqCicpYzywN1vYI+WgIw9L7WReZNmCgAIx94xjpZ29wmmww0PS+4l7hbLVAbbLnSP bxPEDhECF7QsbC8pmjCu4Ai7jwkV5ih5m8C4hQpVaBZzl8hEW1O/NyFB+lclPuiAhHMe LX0g== 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; bh=o6VGoAvdQqK2Elm/WglYXBR1TIROqoxTQR1mS7lNbWE=; b=a8gDBaFGqHgX+PDgZ0TSgTHkavExWieC7F8B78bJ++1qT59EC3cDlLoJ8rPcjM3r5q d6VMAgmbz317U9XAEUHv4zAZn/p3zm/hG4XnAjEWP3QCrj0Z0BT7IktkNCR+Fr8fBrOT F7+F9Jtj2pqFvtChdoMRALjfYNHcGrXwaX/qoS+CBxHYVG2LcWbOpQu3HkL7+nIyTfUy b4uWogf9qbqZBMFft2II7V5415hyQSyniZg9NE80cZcLf+wzQH5feIfSGehJFrExh/zZ 7Ao2i8kjhrswByks8SJxJTU5HoUuQU5aAuM6mW1CnE+q8blNtgP0N/J0/s9vtbsZjv0Y 2kJg== X-Gm-Message-State: AOAM530MvTpNUG9WiM9mnww2rvAhnLcocl6oUyNTo0psuQerCEwFEX3U isDRhV8TIcZJy/pISS5QpJxzkA== X-Google-Smtp-Source: ABdhPJzi2t0QSDqbMVVERhCWyviasFN3RzwpxZkNJ+UuNvy2xJa8gUxSK0qYABBBdRmrPdor0PMZ1w== X-Received: by 2002:adf:e406:: with SMTP id g6mr291971wrm.255.1610388008461; Mon, 11 Jan 2021 10:00:08 -0800 (PST) Received: from localhost.localdomain ([88.122.66.28]) by smtp.gmail.com with ESMTPSA id s12sm77662wmh.29.2021.01.11.10.00.07 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 11 Jan 2021 10:00:08 -0800 (PST) From: Loic Poulain To: kuba@kernel.org, davem@davemloft.net Cc: netdev@vger.kernel.org, linux-arm-msm@vger.kernel.org, manivannan.sadhasivam@linaro.org, Loic Poulain Subject: [PATCH net-next 3/3] net: mhi: Get rid of local rx queue count Date: Mon, 11 Jan 2021 19:07:42 +0100 Message-Id: <1610388462-16322-3-git-send-email-loic.poulain@linaro.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1610388462-16322-1-git-send-email-loic.poulain@linaro.org> References: <1610388462-16322-1-git-send-email-loic.poulain@linaro.org> Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org Use the new mhi_get_free_desc_count helper to track queue usage instead of relying on the locally maintained rx_queued count. Signed-off-by: Loic Poulain --- drivers/net/mhi_net.c | 13 +++++-------- 1 file changed, 5 insertions(+), 8 deletions(-) diff --git a/drivers/net/mhi_net.c b/drivers/net/mhi_net.c index 3da820b..f83562d 100644 --- a/drivers/net/mhi_net.c +++ b/drivers/net/mhi_net.c @@ -25,7 +25,6 @@ struct mhi_net_stats { u64_stats_t tx_bytes; u64_stats_t tx_errors; u64_stats_t tx_dropped; - atomic_t rx_queued; struct u64_stats_sync tx_syncp; struct u64_stats_sync rx_syncp; }; @@ -138,9 +137,9 @@ static void mhi_net_dl_callback(struct mhi_device *mhi_dev, { struct mhi_net_dev *mhi_netdev = dev_get_drvdata(&mhi_dev->dev); struct sk_buff *skb = mhi_res->buf_addr; - int remaining; + int free_desc_count; - remaining = atomic_dec_return(&mhi_netdev->stats.rx_queued); + free_desc_count = mhi_get_free_desc_count(mhi_dev, DMA_FROM_DEVICE); if (unlikely(mhi_res->transaction_status)) { dev_kfree_skb_any(skb); @@ -164,7 +163,7 @@ static void mhi_net_dl_callback(struct mhi_device *mhi_dev, } /* Refill if RX buffers queue becomes low */ - if (remaining <= mhi_netdev->rx_queue_sz / 2) + if (free_desc_count >= mhi_netdev->rx_queue_sz / 2) schedule_delayed_work(&mhi_netdev->rx_refill, 0); } @@ -211,7 +210,7 @@ static void mhi_net_rx_refill_work(struct work_struct *work) struct sk_buff *skb; int err; - while (atomic_read(&mhi_netdev->stats.rx_queued) < mhi_netdev->rx_queue_sz) { + while (!mhi_queue_is_full(mdev, DMA_FROM_DEVICE)) { skb = netdev_alloc_skb(ndev, size); if (unlikely(!skb)) break; @@ -224,8 +223,6 @@ static void mhi_net_rx_refill_work(struct work_struct *work) break; } - atomic_inc(&mhi_netdev->stats.rx_queued); - /* Do not hog the CPU if rx buffers are consumed faster than * queued (unlikely). */ @@ -233,7 +230,7 @@ static void mhi_net_rx_refill_work(struct work_struct *work) } /* If we're still starved of rx buffers, reschedule later */ - if (unlikely(!atomic_read(&mhi_netdev->stats.rx_queued))) + if (mhi_get_free_desc_count(mdev, DMA_FROM_DEVICE) == mhi_netdev->rx_queue_sz) schedule_delayed_work(&mhi_netdev->rx_refill, HZ / 2); }