netdev - Re: [PATCH net-next 4/4] net: mscc: ocelot: set up traps for PTP packets

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Message-ID: <20211126171135.uvmlfmtf73zncpap@skbuf>
Date:   Fri, 26 Nov 2021 17:11:36 +0000
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     Richard Cochran <richardcochran@...il.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Po Liu <po.liu@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Antoine Tenart <atenart@...nel.org>,
        "UNGLinuxDriver@...rochip.com" <UNGLinuxDriver@...rochip.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Xiaoliang Yang <xiaoliang.yang_1@....com>,
        "Y.B. Lu" <yangbo.lu@....com>, Rui Sousa <rui.sousa@....com>,
        "Allan W . Nielsen" <allan.nielsen@...rochip.com>
Subject: Re: [PATCH net-next 4/4] net: mscc: ocelot: set up traps for PTP
 packets

On Fri, Nov 26, 2021 at 09:08:01AM -0800, Richard Cochran wrote:
> On Fri, Nov 26, 2021 at 05:01:13PM +0000, Vladimir Oltean wrote:
> 
> > This, to me, sounds more like the bridge trapping the packets on br0
> > instead of letting them flow on the port netdevices, which is solved by
> > some netfilter rules? Or is it really a driver/hardware issue?
> > 
> > https://lore.kernel.org/netdev/20211116102138.26vkpeh23el6akya@skbuf/
> 
> Yeah, thanks for the link.  I had seen it, but alas it came too late
> for me to try on actual working HW.  Maybe it fixes the issue.
> 
> If someone out there has a Marvell switch, please try it and let us
> know...

On the NXP LS1028A, PTP over IP, under a bridge, works with netfilter rules.
I have a Marvell 6390 switch which supposedly supports timestamping, but
I never got that to work, not even L2, and never had the time to sit
down with it and figure out what's wrong. I think I saw a discussion
initiated by George McCollister saying the same thing.