From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from pandora.armlinux.org.uk (pandora.armlinux.org.uk [78.32.30.218]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E6983230D0F; Fri, 16 Jan 2026 18:08:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=78.32.30.218 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768586926; cv=none; b=Di0PgdZAjq9LGgmK+0z2b0MEedNyFD3ZqqHGrb1e16Obz2vjXH5POyjil0lbIJx4mXTtxkjeGdM9JB03Bf63sUb4/SP9hFh93+FSZ7tESdIMbjAVl/O7w0UoW100JxJf2FUP3zFoEoXdYEdixWwX/La0iVZLn81x3t5rH+ZUozU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768586926; c=relaxed/simple; bh=JbpAk7nm96q2ucJt6fQNL6+1nRmms1uHBJJcqphNN/E=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=dtckE7oMHaAbygq8iLxNJfaSKeSRV1YysRS1WZ7UmeW+/IEMFo8BxVHYKnNOpFxMSeJPKVHds4TaxWj+784lY41jPB2TscH3RTey0SnrXx8nKUHZX6xWhAE1pXXK4UwmRy84YTq04N4r01KGVVF4EDPQJcHrKWn5gbqQN125MuA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=armlinux.org.uk; spf=none smtp.mailfrom=armlinux.org.uk; dkim=pass (2048-bit key) header.d=armlinux.org.uk header.i=@armlinux.org.uk header.b=czOKsZ4p; arc=none smtp.client-ip=78.32.30.218 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=armlinux.org.uk Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=armlinux.org.uk Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=armlinux.org.uk header.i=@armlinux.org.uk header.b="czOKsZ4p" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=armlinux.org.uk; s=pandora-2019; h=Sender:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=rMSr8rpE6TXL8VId1UJJIMcjxvz+l9cVkHXKgGNXGQU=; b=czOKsZ4pEL+m12rvJSEQX3ENCY WGGDiIxep4Jy+Lux3W704sxZsTLeXQwBD+5bgVX7fXQIzvoR/lflnfA9DBwoSfH3B3+9UflPDxsNM GO7aLPgA3tIbC4bJPX5iybc/9DYkoE4ULTcSiXEIhc46LJnK26v3hU48AKiZMyoarTdC2+fGTUFRa 7woR02y45qo2jB0apChCV1XV4tiiX1uWf32nOEnEL6/egfiOHcMLPhbQZcAlPaEMlD/PUneDoM29i 9GjasNLKE8q4ela5NIstKa5Jvb8o/QbtUCt2oSayT6iL+qkatn0b0BmyTj+lRHK5Zizca7yLWoZ7b Cz9uNmhA==; Received: from shell.armlinux.org.uk ([fd8f:7570:feb6:1:5054:ff:fe00:4ec]:54658) by pandora.armlinux.org.uk with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.98.2) (envelope-from ) id 1vgoFF-000000002ZL-3znI; Fri, 16 Jan 2026 18:08:26 +0000 Received: from linux by shell.armlinux.org.uk with local (Exim 4.98.2) (envelope-from ) id 1vgoFA-000000003nO-1jaq; Fri, 16 Jan 2026 18:08:20 +0000 Date: Fri, 16 Jan 2026 18:08:20 +0000 From: "Russell King (Oracle)" To: Maxime Chevallier Cc: Tao Wang , alexandre.torgue@foss.st.com, andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, horms@kernel.org, kuba@kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, mcoquelin.stm32@gmail.com, netdev@vger.kernel.org, pabeni@redhat.com Subject: Re: [PATCH net v2] net: stmmac: fix transmit queue timed out after resume Message-ID: References: <20260115070853.116260-1-tao03.wang@horizon.auto> <6a946edc-297e-469a-8d91-80430d88f3e5@bootlin.com> <51859704-57fd-4913-b09d-9ac58a57f185@bootlin.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: Russell King (Oracle) On Fri, Jan 16, 2026 at 01:37:48PM +0000, Russell King (Oracle) wrote: > On Fri, Jan 16, 2026 at 12:50:35AM +0000, Russell King (Oracle) wrote: > > However, while this may explain the transmit slowdown because it's > > on the transmit side, it doesn't explain the receive problem. > > I'm bisecting to find the cause of the receive issue, but it's going to > take a long time (in the mean time, I can't do any mainline work.) > > So far, the range of good/bad has been narrowed down to 6.14 is good, > 1b98f357dadd ("Merge tag 'net-next-6.16' of > git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next") is bad. > > 14 more iterations to go. Might be complete by Sunday. (Slowness in > building the more fully featured net-next I use primarily for build > testing, the slowness of the platform to reboot, and the need to > manually test each build.) Well, that's been a waste of time today. While the next iteration was building, because it's been suspicious that each and every bisect point has failed so far, I decided to re-check 6.14, and that fails. So, it looks like this problem has existed for some considerable time. I don't have the compute power locally to bisect over a massive range of kernels, so I'm afraid stmmac receive is going to have to stay broken unless someone else can bisect (and find a "good" point in the git history.) -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!