netdev - R: [PATCH v2 4/4] dt-bindings: net: Document use of mac-address-increment

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Date:   Sun, 20 Sep 2020 02:39:39 +0200
From:   <ansuelsmth@...il.com>
To:     "'Andrew Lunn'" <andrew@...n.ch>
Cc:     "'Miquel Raynal'" <miquel.raynal@...tlin.com>,
        "'Richard Weinberger'" <richard@....at>,
        "'Vignesh Raghavendra'" <vigneshr@...com>,
        "'Rob Herring'" <robh+dt@...nel.org>,
        "'David S. Miller'" <davem@...emloft.net>,
        "'Jakub Kicinski'" <kuba@...nel.org>,
        "'Heiner Kallweit'" <hkallweit1@...il.com>,
        "'Russell King'" <linux@...linux.org.uk>,
        "'Frank Rowand'" <frowand.list@...il.com>,
        "'Boris Brezillon'" <bbrezillon@...nel.org>,
        <linux-mtd@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>
Subject: R: [PATCH v2 4/4] dt-bindings: net: Document use of mac-address-increment



> -----Messaggio originale-----
> Da: Andrew Lunn <andrew@...n.ch>
> Inviato: domenica 20 settembre 2020 02:31
> A: Ansuel Smith <ansuelsmth@...il.com>
> Cc: Miquel Raynal <miquel.raynal@...tlin.com>; Richard Weinberger
> <richard@....at>; Vignesh Raghavendra <vigneshr@...com>; Rob Herring
> <robh+dt@...nel.org>; David S. Miller <davem@...emloft.net>; Jakub
> Kicinski <kuba@...nel.org>; Heiner Kallweit <hkallweit1@...il.com>;
> Russell King <linux@...linux.org.uk>; Frank Rowand
> <frowand.list@...il.com>; Boris Brezillon <bbrezillon@...nel.org>; linux-
> mtd@...ts.infradead.org; devicetree@...r.kernel.org; linux-
> kernel@...r.kernel.org; netdev@...r.kernel.org
> Oggetto: Re: [PATCH v2 4/4] dt-bindings: net: Document use of mac-
> address-increment
> 
> > +  mac-address-increment:
> > +    description:
> > +      The MAC address can optionally be increased (or decreased using
> > +      negative values) from the original value readed (from a nvmem
cell
> 
> Read is irregular, there is no readed, just read.
> 
> > +      for example). This can be used if the mac is readed from a
dedicated
> > +      partition and must be increased based on the number of device
> > +      present in the system.
> 
> You should probably add there is no underflow/overflow to other bytes
> of the MAC address. 00:01:02:03:04:ff + 1 == 00:01:02:03:04:00.
> 
> > +    minimum: -255
> > +    maximum: 255
> > +
> > +  mac-address-increment-byte:
> > +    description:
> > +      If 'mac-address-increment' is defined, this will tell what byte
of
> > +      the mac-address will be increased. If 'mac-address-increment' is
> > +      not defined, this option will do nothing.
> > +    default: 5
> > +    minimum: 0
> > +    maximum: 5
> 
> Is there a real need for this? A value of 0 seems like a bad idea,
> since a unicast address could easily become a multicast address, which
> is not valid for an interface address. It also does not seem like a
> good idea to allow the OUI to be changed. So i think only bytes 3-5
> should be allowed, but even then, i don't think this is needed, unless
> you do have a clear use case.
> 
>     Andrew

Honestly the mac-address-increment-byte is added to give user some control
but I
don't really have a use case for it. Should I limit it to 3 or just remove
the function?
Will address the other 2 comment in v3.
Thx for review.