From mboxrd@z Thu Jan 1 00:00:00 1970 From: Richard Cochran Subject: Re: [PATCH net-next RFC 0/9] net: dsa: PTP timestamping for mv88e6xxx Date: Sun, 3 Dec 2017 17:13:19 -0800 Message-ID: <20171204011319.lkib6hor3ln5gtuc@localhost> References: <1506612341-18061-1-git-send-email-brandon.streiff@ni.com> <20170929094323.cwh2ubv4odknlyot@localhost> <20171008153821.w4pm6j43lpdvnpph@localhost> <20171106145546.atfjkqf3xdxu4wyg@localhost> <20171107181344.b4itrmd7atxkwc5x@localhost> <20171108030226.GH7601@lunn.ch> <20171108032327.7waxpd3thrudcxa6@localhost> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Brandon Streiff , "netdev@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "David S. Miller" , Florian Fainelli , Vivien Didelot , Erik Hons To: Andrew Lunn Return-path: Received: from mail-pg0-f53.google.com ([74.125.83.53]:47057 "EHLO mail-pg0-f53.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751386AbdLDBNX (ORCPT ); Sun, 3 Dec 2017 20:13:23 -0500 Content-Disposition: inline In-Reply-To: <20171108032327.7waxpd3thrudcxa6@localhost> Sender: netdev-owner@vger.kernel.org List-ID: On Tue, Nov 07, 2017 at 07:23:27PM -0800, Richard Cochran wrote: > The application does join that group on the external (slave) > interface. I'll find out why the delay request mechanism isn't > working... Looking back, I now recall that the series lets the HW embed the time stamps into the protocol buffers. In the case of UDP, this invalidates the checksum unless the HW corrects it. I'll bet that is what is happening... Thanks, Richard