Add check for unsupported control flags.

Only compile-tested, no access to HW.

Signed-off-by: Asbjørn Sloth Tønnesen <ast@fiberby.net>
---
 drivers/net/dsa/microchip/ksz9477_tc_flower.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/dsa/microchip/ksz9477_tc_flower.c b/drivers/net/dsa/microchip/ksz9477_tc_flower.c
index 8b2f5be667e01..ca7830ab168ac 100644
--- a/drivers/net/dsa/microchip/ksz9477_tc_flower.c
+++ b/drivers/net/dsa/microchip/ksz9477_tc_flower.c
@@ -124,6 +124,9 @@ static int ksz9477_flower_parse_key(struct ksz_device *dev, int port,
 		return -EOPNOTSUPP;
 	}
 
+	if (flow_rule_match_has_control_flags(rule, extack))
+		return -EOPNOTSUPP;
+
 	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_BASIC) ||
 	    flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ETH_ADDRS)) {
 		ret = ksz9477_flower_parse_key_l2(dev, port, extack, rule,
-- 
2.43.0