netdev - Re: [RFC 5/9] net: dsa: mv88e6352: disable mirroring

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Message-ID: <20150603022742.GC932@roeck-us.net>
Date:	Tue, 2 Jun 2015 19:27:42 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Vivien Didelot <vivien.didelot@...oirfairelinux.com>
Cc:	Andrew Lunn <andrew@...n.ch>, netdev <netdev@...r.kernel.org>,
	David <davem@...emloft.net>,
	Florian Fainelli <f.fainelli@...il.com>,
	Scott Feldman <sfeldma@...il.com>,
	Jiri Pirko <jiri@...nulli.us>,
	Jérome Oufella 
	<jerome.oufella@...oirfairelinux.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	kernel <kernel@...oirfairelinux.com>,
	Chris Healy <cphealy@...il.com>
Subject: Re: [RFC 5/9] net: dsa: mv88e6352: disable mirroring

On Tue, Jun 02, 2015 at 09:12:30PM -0400, Vivien Didelot wrote:
> Hi Guenter, Andrew,
> 
> On Jun 2, 2015, at 10:53 AM, Andrew Lunn andrew@...n.ch wrote:
> On Tue, Jun 02, 2015 at 07:16:10AM -0700, Guenter Roeck wrote:
> >> On 06/01/2015 06:27 PM, Vivien Didelot wrote:
> >> >Disable the mirroring policy in the monitor control register, since this
> >> >feature is not needed.
> >> >
> >> >Signed-off-by: Vivien Didelot <vivien.didelot@...oirfairelinux.com>
> >> 
> >> Should this be a separate patch, unrelated to the patch set ?
> 
> Indeed, this one is an unrelated patch, sorry.
> 
> >> If I understand correctly, this effectively disables IGMP/MLD snooping.
> >> I think this warrants an explanation why that it not needed, not just
> >> a statement that it is not needed.
> > 
> > +1
> > 
> > Especially since we might want to revisit this to implement IGMP/MLD
> > snooping in the bridge. The hardware should be capable of it.
> 
> This is something I want to disable because I can have several times
> gigabit traffic on my ports. This would end up in a bottleneck on the
> CPU port. Am I right?
> 
Not really. That should not be that much traffic. Besides, IGMP/MLD snooping
still needs to be enabled separately, as well as egress monitoring.

I don't think this has any impact on the traffic to the CPU port unless other
configuration bits are set as well.

Guenter
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