> -----Messaggio originale-----
> Da: Andrew Lunn <and...@lunn.ch>
> Inviato: domenica 20 settembre 2020 02:31
> A: Ansuel Smith <ansuels...@gmail.com>
> Cc: Miquel Raynal <miquel.ray...@bootlin.com>; Richard Weinberger
> <rich...@nod.at>; Vignesh Raghavendra <vigne...@ti.com>; Rob Herring
> <robh...@kernel.org>; David S. Miller <da...@davemloft.net>; Jakub
> Kicinski <k...@kernel.org>; Heiner Kallweit <hkallwe...@gmail.com>;
> Russell King <li...@armlinux.org.uk>; Frank Rowand
> <frowand.l...@gmail.com>; Boris Brezillon <bbrezil...@kernel.org>; linux-
> m...@lists.infradead.org; devicet...@vger.kernel.org; linux-
> ker...@vger.kernel.org; netdev@vger.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.
