netdev - Re: [PATCH net] net: dsa: tag_8021q: Future-proof the reserved fields in the custom VID

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Message-Id: <20190827.203212.515116185322653581.davem@davemloft.net>
Date:   Tue, 27 Aug 2019 20:32:12 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     olteanv@...il.com
Cc:     f.fainelli@...il.com, vivien.didelot@...il.com, andrew@...n.ch,
        netdev@...r.kernel.org
Subject: Re: [PATCH net] net: dsa: tag_8021q: Future-proof the reserved
 fields in the custom VID

From: Vladimir Oltean <olteanv@...il.com>
Date: Sun, 25 Aug 2019 21:32:12 +0300

> After witnessing the discussion in https://lkml.org/lkml/2019/8/14/151
> w.r.t. ioctl extensibility, it became clear that such an issue might
> prevent that the 3 RSV bits inside the DSA 802.1Q tag might also suffer
> the same fate and be useless for further extension.
> 
> So clearly specify that the reserved bits should currently be
> transmitted as zero and ignored on receive. The DSA tagger already does
> this (and has always did), and is the only known user so far (no
> Wireshark dissection plugin, etc). So there should be no incompatibility
> to speak of.
> 
> Fixes: 0471dd429cea ("net: dsa: tag_8021q: Create a stable binary format")
> Signed-off-by: Vladimir Oltean <olteanv@...il.com>

Applied and queued up for v5.2 -stable.