linux-kernel - Re: [RFC 7/9] net: dsa: mv88e6352: lock CPU port from learning addresses

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Date:	Tue, 2 Jun 2015 21:06:15 -0400 (EDT)
From:	Vivien Didelot <vivien.didelot@...oirfairelinux.com>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	netdev <netdev@...r.kernel.org>, David <davem@...emloft.net>,
	Florian Fainelli <f.fainelli@...il.com>,
	Andrew Lunn <andrew@...n.ch>,
	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 7/9] net: dsa: mv88e6352: lock CPU port from learning
 addresses

Hi Guenter,

On Jun 2, 2015, at 10:24 AM, Guenter Roeck linux@...ck-us.net wrote:
On 06/01/2015 06:27 PM, Vivien Didelot wrote:
>> This commit disables SA learning and refreshing for the CPU port.
>>
> 
> Hi Vivien,
> 
> This patch also seems to be unrelated to the rest of the series.
> 
> Can you add an explanation why it is needed ?
> 
> With this in place, how does the CPU port SA find its way into the fdb ?
> Do we assume that it will be configured statically ?
> An explanation might be useful.

Without this patch, I noticed the CPU port was stealing the SA of a PC
behind a switch port. this happened when the port was a bridge member,
as the bridge was relaying broadcast coming from one switch port to the
other switch ports in the same vlan.

Thanks,
-v
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