[PATCH net-next v2 3/3] net: lan966x: flower: check for unsupported control flags

["Asbjørn Sloth Tønnesen" <ast@fiberby.net>]

Use flow_rule_is_supp_control_flags() to reject filters with
unsupported control flags.

In case any unsupported control flags are masked,
flow_rule_is_supp_control_flags() sets a NL extended
error message, and we return -EOPNOTSUPP.

Only compile-tested.

Signed-off-by: Asbjørn Sloth Tønnesen <ast@fiberby.net>
---
 drivers/net/ethernet/microchip/lan966x/lan966x_tc_flower.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_tc_flower.c b/drivers/net/ethernet/microchip/lan966x/lan966x_tc_flower.c
index 8baec0cd8d95..43913d6204e1 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_tc_flower.c
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_tc_flower.c
@@ -76,6 +76,11 @@ lan966x_tc_flower_handler_control_usage(struct vcap_tc_flower_parse_usage *st)
 			goto bad_frag_out;
 	}
 
+	if (!flow_rule_is_supp_control_flags(FLOW_DIS_IS_FRAGMENT |
+					     FLOW_DIS_FIRST_FRAG,
+					     match.mask->flags, extack))
+		return -EOPNOTSUPP;
+
 	st->used_keys |= BIT_ULL(FLOW_DISSECTOR_KEY_CONTROL);
 
 	return err;
-- 
2.43.0