[PATCH net-next v2] net/mlx5e: flower: check for unsupported control flags

[Asbjørn Sloth Tønnesen]

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.

Remove FLOW_DIS_FIRST_FRAG specific error message,
and treat it as any other unsupported control flag.

Only compile-tested.

Signed-off-by: Asbjørn Sloth Tønnesen <ast@xxxxxxxxxxx>
---

Changelog:

v2:
- remove existing FLOW_DIS_FIRST_FRAG "support" (requested by Jianbo)

v1: https://lore.kernel.org/netdev/20240417135110.99900-1-ast@xxxxxxxxxxx/

 drivers/net/ethernet/mellanox/mlx5/core/en_tc.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
index aeb32cb27182..30673292e15f 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
@@ -2801,12 +2801,6 @@ static int __parse_cls_flower(struct mlx5e_priv *priv,
 		flow_rule_match_control(rule, &match);
 		addr_type = match.key->addr_type;
 
-		/* the HW doesn't support frag first/later */
-		if (match.mask->flags & FLOW_DIS_FIRST_FRAG) {
-			NL_SET_ERR_MSG_MOD(extack, "Match on frag first/later is not supported");
-			return -EOPNOTSUPP;
-		}
-
 		if (match.mask->flags & FLOW_DIS_IS_FRAGMENT) {
 			MLX5_SET(fte_match_set_lyr_2_4, headers_c, frag, 1);
 			MLX5_SET(fte_match_set_lyr_2_4, headers_v, frag,
@@ -2819,6 +2813,10 @@ static int __parse_cls_flower(struct mlx5e_priv *priv,
 			else
 				*match_level = MLX5_MATCH_L3;
 		}
+
+		if (!flow_rule_is_supp_control_flags(FLOW_DIS_IS_FRAGMENT,
+						     match.mask->flags, extack))
+			return -EOPNOTSUPP;
 	}
 
 	if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_BASIC)) {
-- 
2.43.0