net/mlx5e: Allow VLAN rewrite of prio field with the same match

Changing the prio field of the VLAN is not supported. With
commit 37410902874c ("net/mlx5e: Support VLAN modify action") zero
value indicated "no-change". Allow the vid rewrite if the prio match
is the same as the prio set value.

Fixes: 37410902874c ("net/mlx5e: Support VLAN modify action")
Signed-off-by: Eli Britstein <elibr@mellanox.com>
Reviewed-by: Roi Dayan <roid@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
index 3a0854f..611b636 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
@@ -2292,6 +2292,7 @@ static int add_vlan_rewrite_action(struct mlx5e_priv *priv, int namespace,
                .mangle.mask = ~(u32)be16_to_cpu(*(__be16 *)&mask16),
                .mangle.val = (u32)be16_to_cpu(*(__be16 *)&val16),
        };
+       u8 match_prio_mask, match_prio_val;
        void *headers_c, *headers_v;
        int err;
 
@@ -2305,8 +2306,11 @@ static int add_vlan_rewrite_action(struct mlx5e_priv *priv, int namespace,
                return -EOPNOTSUPP;
        }
 
-       if (act->vlan.prio) {
-               NL_SET_ERR_MSG_MOD(extack, "Setting VLAN prio is not supported");
+       match_prio_mask = MLX5_GET(fte_match_set_lyr_2_4, headers_c, first_prio);
+       match_prio_val = MLX5_GET(fte_match_set_lyr_2_4, headers_v, first_prio);
+       if (act->vlan.prio != (match_prio_val & match_prio_mask)) {
+               NL_SET_ERR_MSG_MOD(extack,
+                                  "Changing VLAN prio is not supported");
                return -EOPNOTSUPP;
        }