From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 01C1AC79FBF for ; Thu, 10 Sep 2026 18:33:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:Message-ID:References:In-Reply-To:Subject:Cc:To:From:Date: MIME-Version:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=N2jLRbdlPtNCfQqn4UIVQslnB8/tvN3bZyU9rPBE/A4=; b=mvhzyME5X5O9A+MsK+ST+NhqlL m9fO4rhu32rbtzddGe53yN3m38Cmco6JGyj44jmR6IRgSyYfTaJFCXY3zErfcNpaxTbePETC2ztqH SBBlqREizteodDriSqH5JjBCkckTFM0vBYhwTDr9RtIRly7ktkxEME2FjOGhtTvYTMhVPFWAfLGO/ xuOm3RzEyfxzZ7oX78nt2x5nunszCjIb2/qa6KmW9caa9iRifLMyx7I1ozC3VYZ5J/kzyPHdf2yjw FOpA14B9VkKk35wBEGckgs3LVrULIqVz/uaS31S/ynUxQFn9TPHdC7PslSkW6Uay39WfpRHfT3nLF qeXY19YQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1x4io2-0000000F5fb-22b6; Thu, 10 Sep 2026 17:43:26 +0000 Received: from mail.tipi-net.de ([194.13.80.246]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1x4inz-0000000F5ew-413z for linux-arm-kernel@lists.infradead.org; Thu, 10 Sep 2026 17:43:25 +0000 Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id 94DEFA02B3; Thu, 10 Sep 2026 19:43:08 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=tipi-net.de; s=dkim; t=1789062197; h=from:subject:date:message-id:to:cc:mime-version:content-type: content-transfer-encoding:in-reply-to:references; bh=N2jLRbdlPtNCfQqn4UIVQslnB8/tvN3bZyU9rPBE/A4=; b=s4kzlA9zD145la6gKnyU5JFxS6rad2qVPoa9Fh/Oo7+cQ/i6qxJ1SltCe2xkD2kmMQWWfP TIKm3wgIM5u8YjCQHLRX8k62rlp3XgU84l+dA/pE7JO637XjDqJhheeBu/zhQospkhhVW1 FwRW6PqkR6dVynGvxUVrGUfLLX+NBgi39ovhxDp/3EbdGuiqu2UWRox9JCJjPo9WcnCDhQ uz6OAJlPdkwGK0n0GI7bgkV549BmOwdVhJAbwRzb90kSLM9U2ydFQCIXc3N4knmFTyBWU7 YfygUV7IiQa58pjdKQEZuolRFXf+adQSaETUo6X4FSekpBSL3q0oL4FeauBYEw== MIME-Version: 1.0 Date: Thu, 10 Sep 2026 19:43:08 +0200 From: Nicolai Buchwitz To: Maxime Chevallier Cc: Andrew Lunn , davem@davemloft.net, Eric Dumazet , Jakub Kicinski , Paolo Abeni , Russell King , Heiner Kallweit , =?UTF-8?Q?Alexis_Lothor=C3=A9?= , Maxime Coquelin , Alexandre Torgue , Emil Renner Berthing , Minda Chen , Neil Armstrong , Kevin Hilman , Jerome Brunet , Martin Blumenstingl , Jan Petrous , Ovidiu Panait , Jose.Abreu@synopsys.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, thomas.petazzoni@bootlin.com, linux-arm-kernel@lists.infradead.org, linux-stm32@st-md-mailman.stormreply.com, PKneuper@dspace.de, David Laight Subject: Re: [PATCH net v2 2/6] net: stmmac: selftests: Validate EEE based on the actual LPI timer value In-Reply-To: <20260910151404.976753-3-maxime.chevallier@bootlin.com> References: <20260910151404.976753-1-maxime.chevallier@bootlin.com> <20260910151404.976753-3-maxime.chevallier@bootlin.com> Message-ID: <89e242e8ddc78db7531d17a8a8adb904@tipi-net.de> X-Sender: nb@tipi-net.de Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit X-Last-TLS-Session-Version: TLSv1.3 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260910_104324_303626_346D1773 X-CRM114-Status: GOOD ( 26.06 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Maxime, On 10.9.2026 17:13, Maxime Chevallier wrote: > The EEE selftest is a 2-step test : > - It validates that we enter in LPI mode with the > irq_tx_path_in_lpi_mode_n counter > - It then validates that we exit LPI when sending a frame, with the > irq_tx_path_exit_lpi_mode_n counter. > > The current state of the test lacks 2 main things : > > - We don't know exactly when was the previous frame sent (it's from > the > previous selftest) > > - The timeout is hardcoded, while the LPI is entered after a > user-configurable delay. On top of that, the timeout loop uses a > pre-decrement iterator (--retries) that actually only iterate nine > times, so 900ms while the default LPI value is 1 second. > > Let's therefore make it more deterministic : > > - Send a frame at the beginning of the test > - Wait for more than the lpi timer value, we timeout after about twice > the value, > - Then send another frame, and verify that we do go out of LPI, also > with a timeout. > > Note that the test's goal isn't to validate the LPI timer value itself, > only that we enter/leave LPI mode. > > Fixes: 091810dbded9 ("net: stmmac: Introduce selftests support") > Signed-off-by: Maxime Chevallier > --- > .../stmicro/stmmac/stmmac_selftests.c | 39 +++++++++++++++---- > 1 file changed, 32 insertions(+), 7 deletions(-) > > diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c > b/drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c > index 6503678b646e..a8280834185c 100644 > --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c > +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c > @@ -462,7 +462,7 @@ static int stmmac_test_mmc(struct stmmac_priv > *priv) > static int stmmac_test_eee(struct stmmac_priv *priv) > { > struct stmmac_extra_stats *initial, *final; > - int retries = 10; > + unsigned long timeout, max_duration; > int ret; > > if (!priv->dma_cap.eee || !priv->eee_active) > @@ -478,14 +478,21 @@ static int stmmac_test_eee(struct stmmac_priv > *priv) > goto out_free_initial; > } > > + /* Snapshot stats, we want to count the in_lpi events. We may enter > + * LPI just after the packet was sent. > + */ > memcpy(initial, &priv->xstats, sizeof(*initial)); > > + /* Send a frame, then wait to enter LPI */ > ret = stmmac_test_mac_loopback(priv); > if (ret) > goto out_free_final; > > + max_duration = usecs_to_jiffies(2 * priv->tx_lpi_timer); > + > /* We have no traffic in the line so, sooner or later it will go LPI > */ > - while (--retries) { > + timeout = jiffies + max_duration; > + while (!time_after(jiffies, timeout)) { > memcpy(final, &priv->xstats, sizeof(*final)); > > if (final->irq_tx_path_in_lpi_mode_n > > @@ -494,20 +501,38 @@ static int stmmac_test_eee(struct stmmac_priv > *priv) > msleep(100); > } > > - if (!retries) { > + memcpy(final, &priv->xstats, sizeof(*final)); > + if (final->irq_tx_path_in_lpi_mode_n <= > + initial->irq_tx_path_in_lpi_mode_n) { > ret = -ETIMEDOUT; > goto out_free_final; > } > > - if (final->irq_tx_path_in_lpi_mode_n <= > - initial->irq_tx_path_in_lpi_mode_n) { > - ret = -EINVAL; > + /* Re-snapshot, as we want to measure exit_lpi events. We should be > + * in LPI right now. > + */ > + memcpy(initial, &priv->xstats, sizeof(*initial)); > + > + /* TX something so we go out of LPI */ > + ret = stmmac_test_mac_loopback(priv); > + if (ret) > goto out_free_final; > + > + /* Wait for the exit LPI interrupt */ > + timeout = jiffies + max_duration; > + while (!time_after(jiffies, timeout)) { > + memcpy(final, &priv->xstats, sizeof(*final)); > + > + if (final->irq_tx_path_exit_lpi_mode_n > > + initial->irq_tx_path_exit_lpi_mode_n) > + break; > + msleep(100); > } > > + memcpy(final, &priv->xstats, sizeof(*final)); > if (final->irq_tx_path_exit_lpi_mode_n <= > initial->irq_tx_path_exit_lpi_mode_n) { > - ret = -EINVAL; > + ret = -ETIMEDOUT; > goto out_free_final; > } Reviewed-by: Nicolai Buchwitz