net/mlx5: DR, Fix error flow in creating matcher

The error code of nic matcher init functions wasn't checked.
This patch improves the matcher init function and fix error flow bug:
the handling of match parameter is moved into a separate function
and error flow is simplified.
Signed-off-by: Yevgeny Kliteynik <kliteyn@nvidia.com>

drivers/net/ethernet/mellanox/mlx5/core/steering/dr_matcher.c

@@ -872,13 +872,12 @@ static int dr_matcher_init_fdb(struct mlx5dr_matcher *matcher)
 	return ret;
 }
 
-static int dr_matcher_init(struct mlx5dr_matcher *matcher,
-			   struct mlx5dr_match_parameters *mask)
+static int dr_matcher_copy_param(struct mlx5dr_matcher *matcher,
+				 struct mlx5dr_match_parameters *mask)
 {
+	struct mlx5dr_domain *dmn = matcher->tbl->dmn;
 	struct mlx5dr_match_parameters consumed_mask;
-	struct mlx5dr_table *tbl = matcher->tbl;
-	struct mlx5dr_domain *dmn = tbl->dmn;
-	int i, ret;
+	int i, ret = 0;
 
 	if (matcher->match_criteria >= DR_MATCHER_CRITERIA_MAX) {
 		mlx5dr_err(dmn, "Invalid match criteria attribute\n");
@@ -898,10 +897,36 @@ static int dr_matcher_init(struct mlx5dr_matcher *matcher,
 		consumed_mask.match_sz = mask->match_sz;
 		memcpy(consumed_mask.match_buf, mask->match_buf, mask->match_sz);
 		mlx5dr_ste_copy_param(matcher->match_criteria,
-				      &matcher->mask, &consumed_mask,
-				      true);
+				      &matcher->mask, &consumed_mask, true);
+
+		/* Check that all mask data was consumed */
+		for (i = 0; i < consumed_mask.match_sz; i++) {
+			if (!((u8 *)consumed_mask.match_buf)[i])
+				continue;
+
+			mlx5dr_dbg(dmn,
+				   "Match param mask contains unsupported parameters\n");
+			ret = -EOPNOTSUPP;
+			break;
+		}
+
+		kfree(consumed_mask.match_buf);
 	}
 
+	return ret;
+}
+
+static int dr_matcher_init(struct mlx5dr_matcher *matcher,
+			   struct mlx5dr_match_parameters *mask)
+{
+	struct mlx5dr_table *tbl = matcher->tbl;
+	struct mlx5dr_domain *dmn = tbl->dmn;
+	int ret;
+
+	ret = dr_matcher_copy_param(matcher, mask);
+	if (ret)
+		return ret;
+
 	switch (dmn->type) {
 	case MLX5DR_DOMAIN_TYPE_NIC_RX:
 		matcher->rx.nic_tbl = &tbl->rx;
@@ -919,22 +944,8 @@ static int dr_matcher_init(struct mlx5dr_matcher *matcher,
 	default:
 		WARN_ON(true);
 		ret = -EINVAL;
-		goto free_consumed_mask;
-	}
-
-	/* Check that all mask data was consumed */
-	for (i = 0; i < consumed_mask.match_sz; i++) {
-		if (!((u8 *)consumed_mask.match_buf)[i])
-			continue;
-
-		mlx5dr_dbg(dmn, "Match param mask contains unsupported parameters\n");
-		ret = -EOPNOTSUPP;
-		goto free_consumed_mask;
 	}
 
-	ret =  0;
-free_consumed_mask:
-	kfree(consumed_mask.match_buf);
 	return ret;
 }