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From: George McCollister <>
To: Andrew Lunn <>
Cc: Richard Cochran <>,
	netdev <>
Subject: Re: net: dsa: mv88e6xxx: no multicasts rx'd after enabling hw time stamping
Date: Wed, 11 Aug 2021 10:49:15 -0500	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On Thu, Jul 29, 2021 at 8:42 AM Andrew Lunn <> wrote:
> > Thanks for the feedback. The datasheet covers the 88E6390X, 88E6390,
> > 88E6290, 88E6190X, 88E6190 so I expect those work similarly but if
> > only the 6352 has been tested that could explain it. It certainly
> > helps to know that I'm working with something that may have never
> > worked rather than I'm just doing something dumb.
> I don't think you are doing something dumb.
> What i find interesting is that multicast works, until it does not
> work. I would try to find out what call into the driver causes that
> change.
> Also, general multicast traffic should not really be involved
> here. The switch should be identifying PTP packets as management, and
> sending them to the CPU port, independent of whatever multicast rules
> are set, flooding of unknown multicast etc. This is needed so that PTP
> frames get through a bridge which is in STP blocking mode. Do you see
> any other problems with management traffic? Do bridge PDUs also not
> work?

Sorry for the huge delay, I had to deal with some other things before
I could get back to this.
When the hardware timestamping is on I don't see packets of type
0x88f7 regardless of multicast destination address. If I change the
packet to 0x88f8 I see it. So, it looks like you are right. Before I
had just tried changing the multicast destination address. I'm still
following up on the other suggestions you've made and hopefully that
will lead to something.


>         Andrew

  reply	other threads:[~2021-08-11 15:49 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-28 20:44 George McCollister
2021-07-28 21:04 ` Andrew Lunn
2021-07-28 22:24   ` Richard Cochran
2021-07-29 13:22     ` George McCollister
2021-07-29 13:42       ` Andrew Lunn
2021-08-11 15:49         ` George McCollister [this message]
2021-07-29 13:09   ` George McCollister

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