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 C9A91C19F2E for ; Thu, 27 Feb 2025 11:39:07 +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=nYOi8Pn86GLJLRg1NK8G+xbOZu8C3DTaYMw9S8/4958=; b=KifYU2SFOnactVQ89dcY5f9jES sX+7znRlIWAVxKlofbRPCArTQ7H55sxnSlwzBuQPcl9Um4dO8FZVItEucIuuVISWVyuCTFgU4JeIL /WV9uT1qxPcYUS5oUUls4bBUgeXdWaPjQMoNxVMVO1dV5K2qQRpzE/FaGcWw4oaxZs1Yiw+EOpyFr eZ4Buicx6VyboKB6Bn3YvERJA8ASXXxd41noqFQyyGtsZwY8/mZ+HmKDhM79/lzDT26n+uSVv3QmO edP5xHYUc1UBr+yY2ljaZn1FcP4PFFIsz0h/dsHGBj3+UO4mcr9968aRYdubhkmR8UfGsUp81+Z2R gN1PobRQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tncEE-00000007DKf-09PV; Thu, 27 Feb 2025 11:38:58 +0000 Received: from mgamail.intel.com ([198.175.65.10]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tnbu8-000000078st-2uV5 for linux-arm-kernel@lists.infradead.org; Thu, 27 Feb 2025 11:18:13 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1740655093; x=1772191093; h=message-id:date:mime-version:subject:to:cc:references: from:in-reply-to:content-transfer-encoding; bh=K9BvBv3hLYw0IGq8eJuii6hDq4mM87UTjkwNlZVz44I=; b=P0GodFDMBoFSHwz64pmcR4XSAZAWAyn1z8UM4Z4Kyz+Q37iAnXhhRpPx ySANvXdGi63KdLMqnPNwDYFNhoNabHj4jAzX0yVCCdQniiCnmAvhZLTxi zpbHaol7t+MCM/9JKOSHPC9RmW79+BQRnOrZvQSwGJAxBvd2DOnhfQS2W 1hu7e7FadgT8vTDwh8MPbRaB0Sx8gvObMEkdIFSJ067I8j3nwgA1LE3W5 1Z9bp2otGB1+f7wLT13XT/NX5WkJ+Lc2Nyr8knWvXHd8Unw4oaaKUF91x BaBb7SRGblN3/tBZZqSEizuWKbhqI+C5pJlutaznhlLWooWO/WR4uqSSa Q==; X-CSE-ConnectionGUID: k2I6Jp/9QP+4de8CTHkz0A== X-CSE-MsgGUID: WHUHFKLxTUKiWWdOdmPehg== X-IronPort-AV: E=McAfee;i="6700,10204,11357"; a="58955539" X-IronPort-AV: E=Sophos;i="6.13,319,1732608000"; d="scan'208";a="58955539" Received: from fmviesa008.fm.intel.com ([10.60.135.148]) by orvoesa102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Feb 2025 03:18:12 -0800 X-CSE-ConnectionGUID: PDI93uncReGm6znVKxCg+w== X-CSE-MsgGUID: 4PYYlND1R6+gWOxBvTmk5A== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.13,319,1732608000"; d="scan'208";a="117172348" Received: from choongyo-mobl.gar.corp.intel.com (HELO [10.247.81.210]) ([10.247.81.210]) by fmviesa008-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Feb 2025 03:18:04 -0800 Message-ID: <55ddacb9-dc00-4477-aeab-9b8861563194@linux.intel.com> Date: Thu, 27 Feb 2025 19:18:02 +0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH net-next v8 2/6] net: pcs: xpcs: re-initiate clause 37 Auto-negotiation To: "Russell King (Oracle)" Cc: Simon Horman , Jose Abreu , Jose Abreu , David E Box , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H . Peter Anvin" , Rajneesh Bhardwaj , David E Box , Andrew Lunn , "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Maxime Coquelin , Alexandre Torgue , Jiawen Wu , Mengyuan Lou , Heiner Kallweit , Hans de Goede , =?UTF-8?Q?Ilpo_J=C3=A4rvinen?= , Richard Cochran , Serge Semin , x86@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, platform-driver-x86@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org References: <20250226074837.1679988-1-yong.liang.choong@linux.intel.com> <20250226074837.1679988-3-yong.liang.choong@linux.intel.com> Content-Language: en-US From: Choong Yong Liang In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250227_031812_779492_ECD986EC X-CRM114-Status: GOOD ( 20.91 ) 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 On 26/2/2025 11:40 pm, Russell King (Oracle) wrote: > On Wed, Feb 26, 2025 at 03:48:33PM +0800, Choong Yong Liang wrote: >> diff --git a/drivers/net/pcs/pcs-xpcs-wx.c b/drivers/net/pcs/pcs-xpcs-wx.c >> index fc52f7aa5f59..f73ab04d09f0 100644 >> --- a/drivers/net/pcs/pcs-xpcs-wx.c >> +++ b/drivers/net/pcs/pcs-xpcs-wx.c >> @@ -172,11 +172,9 @@ int txgbe_xpcs_switch_mode(struct dw_xpcs *xpcs, phy_interface_t interface) >> return 0; >> } >> >> - if (xpcs->interface == interface && !txgbe_xpcs_mode_quirk(xpcs)) >> + if (!txgbe_xpcs_mode_quirk(xpcs)) >> return 0; >> >> - xpcs->interface = interface; >> - > > ... > >> --- a/drivers/net/pcs/pcs-xpcs.c >> +++ b/drivers/net/pcs/pcs-xpcs.c >> @@ -602,12 +602,37 @@ static void xpcs_get_interfaces(struct dw_xpcs *xpcs, unsigned long *interfaces) >> __set_bit(compat->interface, interfaces); >> } >> >> +static int xpcs_switch_interface_mode(struct dw_xpcs *xpcs, >> + phy_interface_t interface) >> +{ >> + int ret = 0; >> + >> + if (xpcs->interface != interface) { >> + if (xpcs->info.pma == WX_TXGBE_XPCS_PMA_10G_ID) { >> + ret = txgbe_xpcs_switch_mode(xpcs, interface); >> + if (ret) >> + return ret; > > The above modification changes the functionality. > > In the old code, txgbe_xpcs_switch_mode() does its work when > xpcs->interface is not the same as interface OR txgbe_xpcs_mode_quirk() > is true. > > Your replacement code calls txgbe_xpcs_switch_mode() when > xpcs->interface is not the same as interface, *and* it can do its > work when txgbe_xpcs_mode_quirk() returns true. > > So, e.g. when txgbe_xpcs_mode_quirk() returns false, but the interface > changes, txgbe_xpcs_mode_quirk() used to do its work, but as a result > if your changes, it becomes a no-op. > > The point of txgbe_xpcs_mode_quirk() is to always do the work if it > returns true, even if the interface mode doesn't change. > > Therefore, this patch is logically incorrect, and likely breaks TXGBE. > Thank you for pointing out the oversight. I will review the logic and make the necessary corrections to ensure the patch does not disrupt the expected behavior.