From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-189.mta0.migadu.com (out-189.mta0.migadu.com [91.218.175.189]) (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 6E82B331A56 for ; Tue, 2 Jun 2026 03:01:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.189 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780369297; cv=none; b=r6xG1WUfo/+Q2Cksn5WgTIWaaBY/UOO0+8xEMqSfG54qtBLbHDW8/3Q9Vk2UhU4DX7S1aC9UEjzcvU+T9cA4SbQAwSJcwcFQ5gHKysykYImD0GtLD0wOOrXV4W3nJUuYOL7BjxpqCMywlWak53ex/FER9ynCWlarqI/JSr3tdbY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780369297; c=relaxed/simple; bh=KD639c6qmMAwI9AcMi+WpXp9ZZpEKiKIKB5NVvDbzl4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=gewjoCNe5vZ/w9WElNBu0LMsPB/29vYUCb00F/XYvsKpC2uMoV8L5HT7bo/vw87GfM8BFqBkgXMGaJNTniP5iCe3g61u9+s8qHP+DnlToV++mIlC/SU1DjeCKR10VuNkST80pPpk13su8yW/cNksYOhZ7/hkBbCkallMNsNDPd4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=QMPW/RPK; arc=none smtp.client-ip=91.218.175.189 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="QMPW/RPK" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1780369284; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=KD639c6qmMAwI9AcMi+WpXp9ZZpEKiKIKB5NVvDbzl4=; b=QMPW/RPKGz+ozun+/dNRDKdCfPalp9eYP2dJ4dUjn/TNltp/Q6/Sbi8FW9NSYuQhOFpHic Jnthpp1wsa3fjYfpQXBQ33p2KnIcBn/yJtYLbLkbIH2bd2Q084c20hK4hqF7Sto3/FsbbW UgZ5jsixZsqWFlMCzcapOBjynn/vXZs= From: Qingfang Deng To: Selvamani Rajagopal Cc: Andrew Lunn , Piergiorgio Beruto , "parthiban.veerasooran@microchip.com" , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Jacob Keller , Richard Cochran , netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH net-next v3 08/14] net: ethernet: oa_tc6: Remove FCS size in RX frame Date: Tue, 2 Jun 2026 11:01:06 +0800 Message-ID: <20260602030108.560-1-qingfang.deng@linux.dev> In-Reply-To: References: Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT On Tue, 2 Jun 2026 at 02:40:13, Selvamani Rajagopal wrote: > But strangely ptp4l utility failed with invalid data size. Once we removed FCS, it worked fine. This is because ptp4l misinterprets the FCS as a TLV. There are already several discussions and patches about this issue, however the maintainer insists that the ethernet driver needs to be fixed instead: https://sourceforge.net/p/linuxptp/mailman/message/37858618/ https://sourceforge.net/p/linuxptp/mailman/linuxptp-devel/thread/20190205170652.476c9676%40redhat.com/#msg36579297 https://sourceforge.net/p/linuxptp/mailman/linuxptp-devel/thread/CA%2BDf%2BjcRN98GpUi%3DF_4Ls7miEPbUZYb8O-gpSw0TQoqczVqMfw%40mail.gmail.com/#msg37858491 https://sourceforge.net/p/linuxptp/mailman/linuxptp-devel/thread/8ed1dc74-bf4c-2f13-4ed0-a70d0c4512f6%40cisco.com/#msg37137818 Regards, Qingfang