netdev - Re: [PATCH v2 rfc 0/8] IGMP snooping for local traffic

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Message-ID: <20170906082755.58ff6c8f@xeon-e3>
Date:   Wed, 6 Sep 2017 08:27:55 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     netdev <netdev@...r.kernel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...oirfairelinux.com>,
        Woojung.Huh@...rochip.com, jbe@...gutronix.de,
        sean.wang@...iatek.com, john@...ozen.org
Subject: Re: [PATCH v2 rfc 0/8] IGMP snooping for local traffic

On Wed, 6 Sep 2017 02:47:03 +0200
Andrew Lunn <andrew@...n.ch> wrote:

> > The third and last issue will be explained in a followup email.  
> 
> Hi DSA hackers
> 
> So there is the third issue. It affects just DSA, but it possible
> affects all DSA drivers.
> 
> This patchset broken broadcast with the Marvell drivers. It could
> break broadcast on others drivers as well.
> 
> What i found is that the Marvell chips don't flood broadcast frames
> between bridged ports. What appears to happen is there is a fdb miss,
> so it gets forwarded to the CPU port for the host to deal with. The
> software bridge when floods it out all ports of the bridge.
> 

That sounds like a good feature. There environments where you want
to disable broadcast between certain ports. It lets the bridge get
at the traffic for firewall filtering.