linux-kernel - Re: [PATCH RFT] net: dsa: Allow configuring CPU port VLANs

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Date:   Mon, 25 Jun 2018 12:17:13 +0300
From:   Ilias Apalodimas <ilias.apalodimas@...aro.org>
To:     Petr Machata <petrm@...lanox.com>
Cc:     Florian Fainelli <f.fainelli@...il.com>, netdev@...r.kernel.org,
        jiri@...lanox.com, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...oirfairelinux.com>,
        "David S. Miller" <davem@...emloft.net>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RFT] net: dsa: Allow configuring CPU port VLANs

On Mon, Jun 25, 2018 at 12:13:10PM +0300, Petr Machata wrote:
> Florian Fainelli <f.fainelli@...il.com> writes:
> 
> >  	if (netif_is_bridge_master(vlan->obj.orig_dev))
> > -		return -EOPNOTSUPP;
> > +		info.port = dp->cpu_dp->index;
> 
> The condition above will trigger also when a VLAN is added on a member
> port, and there's no other port with that VLAN. In that case the VLAN
> comes without the BRIDGE_VLAN_INFO_BRENTRY flag. In mlxsw we have this
> to get the bridge VLANs:
> 
> 	if (netif_is_bridge_master(orig_dev)) {
> 		[...]
> 		if ((vlan->flags & BRIDGE_VLAN_INFO_BRENTRY) &&
> 		[...]
> 
> This doesn't appear to be done in DSA unless I'm missing something.
Petr's right. This will trigger for VLANs added on 'not cpu ports' if the VLAN
is not already a member. 

This command has BRIDGE_VLAN_INFO_BRENTRY set:
bridge vlan add dev br0 vid 100 pvid untagged self 
I had the same issue on my CPSW RFC and solved it
exactly the same was as Petr suggested.

> 
> Thanks,
> Petr

Regards
Ilias