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 ABAC3C79FB9 for ; Thu, 10 Sep 2026 15:10:31 +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:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=DAmpgL5dNVrNQnJh+yD//pzzGZfsNROOX3umq9ugYFc=; b=ndxzcYWFZjecENpJ3zIjsIbQQv nbBWT3kThxojI/fu4jOsX36YfZ1MZRgr2KlNy4FhueXkNxEP7djMBPsQU8xNpufDRUvn1pUNHSYvN +2KkgoDTO1zfdjOcYoJxP13b9mokgb1Lh/ckb6S6ETJ9E+5w9ZEiDyb54SORMJ5JxUK8i6JSL+IGf vUQ+OOttRT6RaAdaKNhMsHSRP5d72WMmKsCp7S3YAhdfkfocykq+cu56/mp50k+AROzNcDmx4shm5 a666RDHq6nNNyCWhJpcPZ4YPXhurTQUY6MZ1xGr5IAr+Vpr2B372NRF6gGFiZ0ru+CIjcy2itn0lr J7VA+5rg==; 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bh=DAmpgL5dNVrNQnJh+yD//pzzGZfsNROOX3umq9ugYFc=; b=wCBtnoRqIjXEwv87TBg6OzGvf4AYIGWYUwYDwRdo3W/063xJ94d+OSKsgMGIimBrTafcT9 7bBe8MvW0FcdG5b/Zat/CGay4ASlLq5dbaDpkz1FsUQmLU9g1ha+8K0R12FlyZBWPOU5Em 6yRHGT9vo/CH14PdQ/sBhKP+vh9Z2rYyHJTD/DMHu/drBC07oSHyxyDwLPxlH7nv9X9QwJ rDZygzKwDpm9TrjENagEJDo129nx96Aq7IsQc+052w2rtxVb50VuHrUy85q3NvXIdaw6Tl 730yhNgMdHGw3DHwokypk7Y2f+MIG63CJLaSBVqJbhZyIOIfMc0ix2BGKaXG0g== Message-ID: Date: Thu, 10 Sep 2026 17:09:55 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH net 2/6] net: stmmac: selftests: Validate EEE based on the actual LPI timer value To: Nicolai Buchwitz 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 References: <20260909074740.1247762-1-maxime.chevallier@bootlin.com> <20260909074740.1247762-3-maxime.chevallier@bootlin.com> <2f268c9ff187ba59f69d37dd4e4ba99b@tipi-net.de> Content-Language: en-US From: Maxime Chevallier In-Reply-To: <2f268c9ff187ba59f69d37dd4e4ba99b@tipi-net.de> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Last-TLS-Session-Version: TLSv1.3 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260910_081021_729307_877885AB X-CRM114-Status: GOOD ( 19.62 ) 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, On 9/9/26 13:32, Nicolai Buchwitz wrote: > Hi Maxime > > On 9.9.2026 09:47, 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         | 33 ++++++++++++++----- >>  1 file changed, 25 insertions(+), 8 deletions(-) >> >> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c >> index 6503678b646e..4564b9f29194 100644 >> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c >> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_selftests.c > >> [...] > >> -    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); >> + >> +    memcpy(initial, &priv->xstats, sizeof(*initial)); > > Is the LPI entry already counted here? AFAIU with tx-lpi-timer=0 on dwmac4 the > MAC goes directly into LPI after the frame, before stmmac_test_mac_loopback() > returns. The loop below would time out although LPI is working. > > Snapshot before the first frame, and take a second snapshot right before > the second loopback for the exit check? > >> [...] > >> +    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; > > nit: -ETIMEDOUT here as well, to match the entry check? I ended up changing my mind and following you call here, V2 is incoming, hopefully with all the patches this time :) Maxime > > Thanks > Nicolai