Re: [PATCH] ethernet: aquantia: Try MAC address from device tree

Andrew Lunn
2021-11-28T16:35:29Z

On Sat, Nov 27, 2021 at 08:37:33PM -0600, Tianhao Chai wrote:
> Apple M1 Mac minis (2020) with 10GE NICs do not have MAC address in the
> card, but instead need to obtain MAC addresses from the device tree. In
> this case the hardware will report an invalid MAC.
>
> Currently atlantic driver does not query the DT for MAC address and will
> randomly assign a MAC if the NIC doesn't have a permanent MAC burnt in.
> This patch causes the driver to perfer a valid MAC address from OF (if
> present) over HW self-reported MAC and only fall back to a random MAC
> address when neither of them is valid.

This is a change in behaviour, and could cause regressions. It would
be better to keep with the current flow. Call
aq_fw_ops->get_mac_permanent() first. If that does not give a valid
MAC address, then try DT, and lastly use a random MAC address.

Andrew