From patchwork Wed Feb 14 13:57:57 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Claudiu X-Patchwork-Id: 13556563 X-Patchwork-Delegate: geert@linux-m68k.org Received: from mail-wr1-f51.google.com (mail-wr1-f51.google.com [209.85.221.51]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7732E55C1A for ; Wed, 14 Feb 2024 13:58:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.221.51 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707919131; cv=none; b=VxIXEpSi5tq1frm4R8lOJY+OfOvvsIws+8Q0RUDU1DYhy+iXZIKzaZ81D/lJpVnPO5tYh/FBPWEBCNNqBTD8iGGT5wdDyxT109EVBvof5Lh1RP0cpNMn7UQWzAjJ+XYeyizZtp+Ciy6eyN48uooEnqR54A1+69eVXI/0o2bKFYk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707919131; c=relaxed/simple; bh=FjpT7HYwfIhvnqp4YHdZLJltiMOVfPS1cPTRRdMvPpA=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=UKC3zi4mBDz4FCfLDcUkZbqEO+P5aRmDQCzapNDdn5Yv/5EQxltDUWGXf/PEoCbj9EVJsgAahjlAYLRljxBFZUCunnl/qW/6eI4OyveWOxqCLK2s5C/5qMsXcUGD+8XLQQCqKMYEea6i9jyuOncwGDlG3fu3OjpdpVnkHY5/daQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=tuxon.dev; spf=pass smtp.mailfrom=tuxon.dev; dkim=pass (2048-bit key) header.d=tuxon.dev header.i=@tuxon.dev header.b=ZI2P9KWM; arc=none smtp.client-ip=209.85.221.51 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=tuxon.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=tuxon.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=tuxon.dev header.i=@tuxon.dev header.b="ZI2P9KWM" Received: by mail-wr1-f51.google.com with SMTP id ffacd0b85a97d-3394b892691so554262f8f.1 for ; Wed, 14 Feb 2024 05:58:49 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=tuxon.dev; s=google; t=1707919128; x=1708523928; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=LNOxk7ObMlNCb9z7bNPG/kiAHGWviZsSjwr9QNQkzTs=; b=ZI2P9KWM/nrONJ9toyahqSKqaKH3K3EHbiCBTl14drdBlIcdCbzfcZBs4l7LNcMp3L +0TZKoWidLpJaT1BBYgjgyXbFMVIVpzQLOjf5X+miC8z/TCOUGZyyAHF+zQFMjC5bgS6 khbCpdNTWKy/gstAPW6AakaV3/1tCRcZU1LzJgN0S+ljPYSFzMjixoJnKLH6EXAN0MsB 3B87yBQ1+5Uzq+CzjLkXcChqv4/sOHR711p9w0eboKMTVqkuA6i2pAbA1HcOk9Vs46oK Wbq6qaS295u9tOKL1cAfL7MFlgMqDnj7gvE6p6G+XAozNbeLcUAgthtojYUk6qk0c/Aw uksw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1707919128; x=1708523928; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=LNOxk7ObMlNCb9z7bNPG/kiAHGWviZsSjwr9QNQkzTs=; b=DnUY2fR/QmVeHAvCnr7Y860WV5jD7yPxJ3bsPl12eaUqXXuIycZEre4kkWAbbSRNT2 7KzyEpV9lTng1wTjDXNCgRhmLuXrv3/w3ftwFKUgiwZUuJZ6+32QTJSK/elk8RWBEC+s A6/PFU1XGD0uQ9F6dVrkwVszKZeQ8LFbsT5EuLdjtg4cXNFUZQmPdf4GM/Bp714xcICs EXym3/QKwUaEB2mxjEZHH6K8m5nfw9VUcLu8XWPgr2ii9OIIZ2f0umLmqGNyFmuuKG6m JaXt5koB2UEBkwPXSAj+aIBLscEm7s1AQ2b2Xf1ZuQ5pnqbSGQHJ1qOOaKBXcRVx+RDr piXg== X-Forwarded-Encrypted: i=1; AJvYcCVcuazgn+zKz+eBgVPaxOgeQyiQ9sdYBaEn/HAN6p94vly27gmxQEmzEQBxvdX6y6Z0QgD7n2qmuqmXCFx8fvjBubxfPvWhCMMHkHPFlRxJ5OY= X-Gm-Message-State: AOJu0YzAiauCUG2yndtOnDlx9k9fi9wrjW/tqEBej15AZKoKngHXDPAF nreS3WYcFQd6nowwcHs241BO+UmCh8qLZwMGdFUwJXZSPdX8b0fn0F2LprIfcBM= X-Google-Smtp-Source: AGHT+IHK7iuy1qy6aGSYk+qSKN6o73sTYMtUh76iYC0dJvzAJbqMyr2Rgb+brY7G3+I0wM1w/gzVVA== X-Received: by 2002:adf:ea8d:0:b0:33c:f29a:30ec with SMTP id s13-20020adfea8d000000b0033cf29a30ecmr911894wrm.25.1707919127685; Wed, 14 Feb 2024 05:58:47 -0800 (PST) X-Forwarded-Encrypted: i=1; AJvYcCXyOQ5GbcNIQ6rfjuLwMp8PqwHzicVvuuJ7S+f4wLP/0H/l8QubsaFrXRCoDnuP/8vwZAHZe0RD1Kvqm7bMILuvkso5XDDEL5Qf8B+OIYFuVakb3Yc426JUGj+ikTFZsmspp7WJKyZAnzdg5TmkXXxGkuctdedr6boDsaTxQAonlq6iUZNBs4ZCjnTuCz4kCsrXVXW3S56HM4aomL1329GtwZSwjLEx+8ICsAFIFpJXNNHb1vl60HT2EPRIL0s0GhzL2pt57YXzDXGBNECHF0pejcS45H46VUNocpeplHT65HrnXnvCbjjN2xljnuo5LfaYh7AuT5RaFsCcdkc5W+nXomvM5ljeD1U4tHAYPa/6xmVCSjhS Received: from claudiu-X670E-Pro-RS.. ([82.78.167.20]) by smtp.gmail.com with ESMTPSA id f15-20020adff58f000000b0033cdbebfda7sm4282140wro.14.2024.02.14.05.58.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 14 Feb 2024 05:58:47 -0800 (PST) From: Claudiu X-Google-Original-From: Claudiu To: s.shtylyov@omp.ru, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, biju.das.jz@bp.renesas.com Cc: netdev@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-kernel@vger.kernel.org, claudiu.beznea@tuxon.dev, Claudiu Beznea Subject: [PATCH net-next v4 3/6] net: ravb: Return cached statistics if the interface is down Date: Wed, 14 Feb 2024 15:57:57 +0200 Message-Id: <20240214135800.2674435-4-claudiu.beznea.uj@bp.renesas.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240214135800.2674435-1-claudiu.beznea.uj@bp.renesas.com> References: <20240214135800.2674435-1-claudiu.beznea.uj@bp.renesas.com> Precedence: bulk X-Mailing-List: linux-renesas-soc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Claudiu Beznea Return the cached statistics in case the interface is down. There should be no drawback to this, as cached statistics are updated in ravb_close(). In order to avoid accessing the IP registers while the IP is runtime suspended pm_runtime_active() check was introduced. The device runtime PM usage counter has been incremented to avoid disabling the device clocks while the check is in progress (if any). The commit prepares the code for the addition of runtime PM support. Suggested-by: Sergey Shtylyov Signed-off-by: Claudiu Beznea Reviewed-by: Sergey Shtylyov --- Changes in v4: - none Changes in v3: - none Changes in v2: - collected tag Changes since [2]: - use pm_runtime_get_noresume() and pm_runtime_active() Changes in v3 of [2]: - this was patch 18/21 in v2 - use ndev->flags & IFF_UP instead of netif_running checks Changes in v2 of [2]: - none; this patch is new [2] https://lore.kernel.org/all/20240105082339.1468817-1-claudiu.beznea.uj@bp.renesas.com/ drivers/net/ethernet/renesas/ravb_main.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c index c81cbd81826e..7a7f743a1fef 100644 --- a/drivers/net/ethernet/renesas/ravb_main.c +++ b/drivers/net/ethernet/renesas/ravb_main.c @@ -2248,8 +2248,15 @@ static struct net_device_stats *ravb_get_stats(struct net_device *ndev) struct ravb_private *priv = netdev_priv(ndev); const struct ravb_hw_info *info = priv->info; struct net_device_stats *nstats, *stats0, *stats1; + struct device *dev = &priv->pdev->dev; nstats = &ndev->stats; + + pm_runtime_get_noresume(dev); + + if (!pm_runtime_active(dev)) + goto out_rpm_put; + stats0 = &priv->stats[RAVB_BE]; if (info->tx_counters) { @@ -2291,6 +2298,8 @@ static struct net_device_stats *ravb_get_stats(struct net_device *ndev) nstats->rx_over_errors += stats1->rx_over_errors; } +out_rpm_put: + pm_runtime_put_noidle(dev); return nstats; } @@ -2358,6 +2367,9 @@ static int ravb_close(struct net_device *ndev) if (info->nc_queues) ravb_ring_free(ndev, RAVB_NC); + /* Update statistics. */ + ravb_get_stats(ndev); + /* Set reset mode. */ return ravb_set_opmode(ndev, CCC_OPC_RESET); }