On Thu,  7 Sep 2023 11:24:04 +0200 Maxime Chevallier wrote:

 	ETHTOOL_MSG_PHY_LIST_GET,
+	ETHTOOL_MSG_PHY_GET,

The distinction between LIST_GET and GET is a bit odd for netlink.
GET has a do and a dump. The dump is effectively LIST_GET.

The dump can accept filtering arguments, like ifindex, if you want 
to narrow down the results, that's perfectly fine (you may need to
give up some of the built-in ethtool scaffolding, but it shouldn't 
be all that bad).