netdev - Re: [RFC net-next 1/3] net: bridge: Allow bridge master device to configure switch CPU port

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Date:   Thu, 24 Nov 2016 10:49:08 +0900
From:   Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
To:     Vivien Didelot <vivien.didelot@...oirfairelinux.com>,
        Florian Fainelli <f.fainelli@...il.com>, netdev@...r.kernel.org
Cc:     davem@...emloft.net, bridge@...ts.linux-foundation.org,
        stephen@...workplumber.org, andrew@...n.ch, jiri@...lanox.com,
        idosch@...lanox.com
Subject: Re: [RFC net-next 1/3] net: bridge: Allow bridge master device to
 configure switch CPU port

On 2016/11/23 0:46, Vivien Didelot wrote:
> Hi Florian,
> 
> Florian Fainelli <f.fainelli@...il.com> writes:
> 
>> bridge vlan add vid 2 dev br0 self
>> 	-> CPU port gets programmed
>> bridge vlan add vid 2 dev port0
>> 	-> port0 (switch port 0) gets programmed
> 
> Although this is not specific to this patch, I'd like to point out that
> this seems not to be the behavior bridge expects.
> 
> The bridge manpage says:
> 
>     bridge vlan add - add a new vlan filter entry
>     ...
> 
>        self   the vlan is configured on the specified physical device.
>               Required if the device is the bridge device.
> 
>        master the vlan is configured on the software bridge (default).
> 
> So if I'm not mistaken, the switch chip must be programmed only when the
> bridge command is called with the "self" attribute. Without it, only
> software configuration must be made, like what happens when the driver
> returns -EOPNOTSUPP.
> 
> Currently, both commands below program the hardware:
> 
>     # bridge vlan add vid 2 dev port0 [master]
>     # bridge vlan add vid 2 dev port0 [master] self

Actually this is intended behavior, which keeps backward compatibility.
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=7f1095394918c7058ff81c96c3bab3a897e97a9d

Thanks,
Toshiaki Makita