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Message-ID: <e784ab5356aa4b6e93765b54bdefea0a@sphcmbx02.sunplus.com.tw>
Date: Tue, 19 Apr 2022 10:07:55 +0000
From: Wells Lu 呂芳騰 <wells.lu@...plus.com>
To: Andrew Lunn <andrew@...n.ch>, Jakub Kicinski <kuba@...nel.org>
CC: Wells Lu <wellslutw@...il.com>,
"davem@...emloft.net" <davem@...emloft.net>,
"robh+dt@...nel.org" <robh+dt@...nel.org>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
"pabeni@...hat.com" <pabeni@...hat.com>,
"krzk+dt@...nel.org" <krzk+dt@...nel.org>,
"roopa@...dia.com" <roopa@...dia.com>,
"edumazet@...gle.com" <edumazet@...gle.com>
Subject: RE: [PATCH net-next v8 2/2] net: ethernet: Add driver for Sunplus
SP7021
> > > + /* Get mac-address from nvmem. */
> > > + ret = spl2sw_nvmem_get_mac_address(&pdev->dev, port_np, mac_addr);
> > > + if (ret) {
> > > + dev_info(&pdev->dev, "Generate a random mac address!\n");
> > > +
> > > + /* Generate a mac address using OUI of Sunplus Technology
> > > + * and random controller number.
> > > + */
> > > + mac_addr[0] = 0xfc; /* OUI of Sunplus: fc:4b:bc */
> > > + mac_addr[1] = 0x4b;
> > > + mac_addr[2] = 0xbc;
> > > + mac_addr[3] = get_random_int() % 256;
> > > + mac_addr[4] = get_random_int() % 256;
> > > + mac_addr[5] = get_random_int() % 256;
> >
> > I don't think you can do that. Either you use your OUI and assign the
> > address at manufacture or you must use a locally administered address.
> > And if locally administered address is used it better be completely
> > random to lower the probability of collision to absolute minimum.
>
> I commented about that in an earlier version of these patches. We probably need a quote
> from the 802.1 or 802.3 which says this is O.K.
>
> Andrew
Hi Andrew,
I plan to replace above statements with:
eth_random_addr(mac_addr);
eth_random_addr() generates locally administered (random) address.
Do you mean I can keep use the mac address: "OUI + random number"?
Only need to add comment for it.
What comment should I add? Which one do you recommend?
Thank you very much for your review.
Best regards,
Wells
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