linux-kernel - Re: [PATCH net v6 1/6] net: marvell: prestera: Add driver for Prestera family ASIC devices

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Date:   Fri, 4 Sep 2020 15:32:17 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Vadym Kochan <vadym.kochan@...ision.eu>
Cc:     Willem de Bruijn <willemdebruijn.kernel@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jiri Pirko <jiri@...lanox.com>,
        Ido Schimmel <idosch@...lanox.com>,
        Oleksandr Mazur <oleksandr.mazur@...ision.eu>,
        Serhiy Boiko <serhiy.boiko@...ision.eu>,
        Serhiy Pshyk <serhiy.pshyk@...ision.eu>,
        Volodymyr Mytnyk <volodymyr.mytnyk@...ision.eu>,
        Taras Chornyi <taras.chornyi@...ision.eu>,
        Andrii Savka <andrii.savka@...ision.eu>,
        Network Development <netdev@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Mickey Rachamim <mickeyr@...vell.com>
Subject: Re: [PATCH net v6 1/6] net: marvell: prestera: Add driver for
 Prestera family ASIC devices

> > > +static int prestera_is_valid_mac_addr(struct prestera_port *port, u8 *addr)
> > > +{
> > > +       if (!is_valid_ether_addr(addr))
> > > +               return -EADDRNOTAVAIL;
> > > +
> > > +       if (memcmp(port->sw->base_mac, addr, ETH_ALEN - 1))
> > 
> > Why ETH_ALEN - 1?
> > 
> This is the restriction of the port mac address, it must have base mac
> address part at first 5 bytes.

You probably want to put a comment here about that.

And this is particularly user unfriendly. Is this a hardware issue? Or
firmware? Is this likely to change in the future?

	  Andrew