netdev - Re: [PATCH net 2/2] net: dsa: tag_8021q: Create a stable binary format

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Date:   Tue, 28 May 2019 18:08:19 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Vladimir Oltean <olteanv@...il.com>, vivien.didelot@...il.com,
        andrew@...n.ch, davem@...emloft.net
Cc:     ioana.ciornei@....com, netdev@...r.kernel.org
Subject: Re: [PATCH net 2/2] net: dsa: tag_8021q: Create a stable binary
 format



On 5/28/2019 3:50 PM, Vladimir Oltean wrote:
> Tools like tcpdump need to be able to decode the significance of fake
> VLAN headers that DSA uses to separate switch ports.
> 
> But currently these have no global significance - they are simply an
> ordered list of DSA_MAX_SWITCHES x DSA_MAX_PORTS numbers ending at 4095.
> 
> The reason why this is submitted as a fix is that the existing mapping
> of VIDs should not enter into a stable kernel, so we can pretend that
> only the new format exists. This way tcpdump won't need to try to make
> something out of the VLAN tags on 5.2 kernels.
> 
> Fixes: f9bbe4477c30 ("net: dsa: Optional VLAN-based port separation for switches without tagging")
> Signed-off-by: Vladimir Oltean <olteanv@...il.com>

Reviewed-by: Florian Fainelli <f.fainelli@...il.com>

This looks a lot nicer actually, and kudos for documenting the format.
-- 
Florian