On Tue, 23 Aug 2022 08:04:37 -0700 Jacob Keller wrote:

Add the netlink extended ACK structure pointer to the interface for
.set_fecparam. This allows reporting errors to the user appropriately when
using the netlink ethtool interface.

Could you wrap it into a structure perhaps?

Would be good if we didn't have to modify the signature of the callback
next time we need to extend it (especially since struct ethtool_fecparam
is ioctl uABI so we can't really add fields there).