netdev.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Andrew Lunn <andrew@lunn.ch>
To: Tobias Waldekranz <tobias@waldekranz.com>
Cc: Rasmus Villemoes <rasmus.villemoes@prevas.dk>,
	Network Development <netdev@vger.kernel.org>,
	Vivien Didelot <vivien.didelot@gmail.com>,
	Horatiu Vultur <horatiu.vultur@microchip.com>,
	Vladimir Oltean <olteanv@gmail.com>
Subject: Re: commit 4c7ea3c0791e (net: dsa: mv88e6xxx: disable SA learning for DSA and CPU ports)
Date: Mon, 18 Jan 2021 20:01:12 +0100	[thread overview]
Message-ID: <YAXa+FkP3DHR9nlK@lunn.ch> (raw)
In-Reply-To: <87v9bujdwm.fsf@waldekranz.com>

On Mon, Jan 18, 2021 at 07:30:49PM +0100, Tobias Waldekranz wrote:
> On Mon, Jan 18, 2021 at 18:50, Andrew Lunn <andrew@lunn.ch> wrote:
> >> I suppose the real solution is having userspace do some "bridge mdb add"
> >> yoga, but since no code currently uses
> >> MV88E6XXX_G1_ATU_DATA_STATE_MC_STATIC_DA_MGMT, I don't think there's any
> >> way to actually achieve this. And I have no idea how to represent the
> >> requirement that "frames with this multicast DA are only to be directed
> >> at the CPU" in a hardware-agnostic way.
> >
> > The switchdev interface for this exists, because there can be
> > multicast listeners on the bridge. When they join a group, they ask
> > the switch to put in a HOST MDB, which should cause the traffic for
> 
> That is not quite the same thing as "management" though. Adding the
> group to the host MDB will not allow it to pass through blocked (in the
> STP sense) ports for example. With a management entry, the switch will
> trap the packet with a TO_CPU tag, which means no ingress policy can get
> in the way of it reaching the CPU.

Ah, yes. I don't suppose the DA is part of the special group which the
switch will recognise as management and pass it on?

01:80:c2:00:00:00 - 01:80:c2:00:00:07
01:80:c2:00:00:08 - 01:80:c2:00:00:0f
01:80:c2:00:00:20 - 01:80:c2:00:00:27
01:80:c2:00:00:28 - 01:80:c2:00:00:2f

	Andrew

  reply	other threads:[~2021-01-18 19:02 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-14 13:49 Rasmus Villemoes
2021-01-16  1:42 ` Tobias Waldekranz
2021-01-18 15:41   ` Rasmus Villemoes
2021-01-18 17:50     ` Andrew Lunn
2021-01-18 18:30       ` Tobias Waldekranz
2021-01-18 19:01         ` Andrew Lunn [this message]
2021-01-18 19:10           ` Tobias Waldekranz
2021-01-18 21:19   ` Vladimir Oltean
2021-01-18 22:07     ` Rasmus Villemoes
2021-01-18 23:08       ` Tobias Waldekranz
2021-01-19  9:15       ` Horatiu Vultur

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=YAXa+FkP3DHR9nlK@lunn.ch \
    --to=andrew@lunn.ch \
    --cc=horatiu.vultur@microchip.com \
    --cc=netdev@vger.kernel.org \
    --cc=olteanv@gmail.com \
    --cc=rasmus.villemoes@prevas.dk \
    --cc=tobias@waldekranz.com \
    --cc=vivien.didelot@gmail.com \
    --subject='Re: commit 4c7ea3c0791e (net: dsa: mv88e6xxx: disable SA learning for DSA and CPU ports)' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).