linux-kernel - Re: [PATCH net-next 2/5] net: dsa: check VLAN capability of every switch

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Date:   Wed, 07 Jun 2017 16:03:31 -0400
From:   Vivien Didelot <vivien.didelot@...oirfairelinux.com>
To:     Florian Fainelli <f.fainelli@...il.com>, netdev@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kernel@...oirfairelinux.com,
        "David S. Miller" <davem@...emloft.net>,
        Andrew Lunn <andrew@...n.ch>
Subject: Re: [PATCH net-next 2/5] net: dsa: check VLAN capability of every switch

Hi Florian,

Florian Fainelli <f.fainelli@...il.com> writes:

> On 06/06/2017 01:56 PM, Vivien Didelot wrote:
>> Now that the VLAN object is propagated to every switch chip of the
>> switch fabric, we can easily ensure that they all support the required
>> VLAN operations before modifying an entry on a single switch.
>> 
>> To achieve that, remove the condition skipping other target switches,
>> and add a bitmap of VLAN members, eventually containing the target port,
>> if we are programming the switch target.
>
> You could add in the commit message that with this commit, there is not
> actually a functional change yet because we have one (and only one) bit
> set in the members bitmap.

Hum there is a small functional change though: if one interconnected
switch of the fabric does not support the VLAN operations, -EOPNOTSUPP
is returned (even though the target switch is VLAN capable.)

Thanks,

        Vivien