On Fri, Dec 08, 2023 at 02:33:00PM +0200, Roger Quadros wrote:

But,

bool __ethtool_dev_mm_supported(struct net_device *dev)
{
	const struct ethtool_ops *ops = dev->ethtool_ops;
	struct ethtool_mm_state state = {};
	int ret = -EOPNOTSUPP;

	if (ops && ops->get_mm)
		ret = ops->get_mm(dev, &state);

	return !ret;
}

So looks like it is better to not define get_mm/set_mm if CONFIG_TI_AM65_CPSW_TAS is disabled.

Why not? __ethtool_dev_mm_supported() returns true if os->get_mm() is
implemented and returns 0. You return -EOPNOTSUPP, and that's different
from 0.