linux-kernel - Re: [PATCH v3 net-next 18/24] net: dsa: sja1105: Add support for traffic through standalone ports

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Message-ID: <20190414161757.GB10323@lunn.ch>
Date:   Sun, 14 Apr 2019 18:17:57 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Florian Fainelli <f.fainelli@...il.com>, vivien.didelot@...il.com,
        davem@...emloft.net, netdev <netdev@...r.kernel.org>,
        linux-kernel@...r.kernel.org,
        Georg Waibel <georg.waibel@...sor-technik.de>
Subject: Re: [PATCH v3 net-next 18/24] net: dsa: sja1105: Add support for
 traffic through standalone ports

> > > > > +             return dsa_8021q_xmit(skb, netdev, ETH_P_EDSA,
> > > > > +                                  ((pcp << VLAN_PRIO_SHIFT) | tx_vid));
> > > >
> > > > Please don't reuse ETH_P_EDSA. Define an ETH_P_SJA1105.
> > > >
> 
> I'm receiving contradictory advice on this. Why should I define a new
> ethertype, and if I do, what scope should the definition have (local
> to the driver and the tagger, local to DSA, UAPI)?

ETH_P_EDSA has a well defined meaning. It is a true global EtherType,
and means a Marvell EtherType DSA header follows.

You are polluting this meaning of ETH_P_EDSA. Would you put ETH_P_IP
or ETH_P_8021AD here?

   Andrew