linux-kernel - Re: [RFC 3/9] net: dsa: mv88e6xxx: add support for VTU ops

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Message-ID: <1561034247.953427.1433295590494.JavaMail.zimbra@savoirfairelinux.com>
Date:	Tue, 2 Jun 2015 21:39:50 -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 3/9] net: dsa: mv88e6xxx: add support for VTU ops

Guenter,

On Jun 2, 2015, at 2:50 AM, Guenter Roeck linux@...ck-us.net wrote:
> On 06/01/2015 06:27 PM, Vivien Didelot wrote:
>> +    /* Bringing an interface up adds it to the VLAN 0. Ignore this. */
>> +    if (!vid)
>> +        return 0;
>> +
> 
> Me puzzled ;-). I brought this and the fid question up before.
> No idea if my e-mail got lost or what happened.
> 
> Can you explain why we don't need a configuration for vlan 0 ?

Sorry for late reply. Initially, when issuing "ip link set up dev swp0",
ndo_vlan_rx_add_vid was called to add the interface in the VLAN 0.

2 things happen here:

  * this is inconsistent with the "bridge vlan" output which doesn't seem to
    know about a VID 0;
  * VID 0 seems special for this switch: if an ingressing frame has VID 0, the
    tagged port will override the VID bits with the port default VID at egress.

Thanks,
-v
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