Set ethtool_ops->supported_coalesce_params to let
the core reject unsupported coalescing parameters.
This driver did not previously reject unsupported parameters.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
 };
 
 static const struct ethtool_ops gmac_351x_ethtool_ops = {
+       .supported_coalesce_params = ETHTOOL_COALESCE_RX_USECS |
+                                    ETHTOOL_COALESCE_MAX_FRAMES,
        .get_sset_count = gmac_get_sset_count,
        .get_strings    = gmac_get_strings,
        .get_ethtool_stats = gmac_get_ethtool_stats,