quoted

struct ethtool_kringparam {
	__u32	cmd;
	__u32   mode;
	__u32	rx_max_pending;
	__u32	rx_mini_max_pending;
	__u32	rx_jumbo_max_pending;
	__u32	tx_max_pending;
	__u32	rx_pending;
	__u32	rx_mini_pending;
	__u32	rx_jumbo_pending;
	__u32	tx_pending;
};

and use this structure between the ethtool core and the drivers. This
has already been done at least once to allow extending the
API. Semantic patches are good for making the needed changes to all
the drivers.

What about the proposed "two new parameters ringparam_ext and extack for
.get_ringparam and .set_ringparam to extend more ring params through
netlink." by Hao Chen/Guangbin Huang in:

https://lore.kernel.org/all/20211014113943.16231-5-huangguangbin2@huawei.com/ (local)

I personally like the conversion of the in in-kernel API to struct
ethtool_kringparam better than adding ringparam_ext.

Ah, i missed that development. I don't like it.

You should probably jump into that discussion and explain your
requirements. Make sure it is heading in a direction you can extend
for your needs.

    Andrew