net/mlx5e: Move sample attr allocation to tc_action sample parse op

There is no reason to wait with the kmalloc to after parsing all
other actions. There could still be a failure later and before
offloading the rule. So alloc the mem when parsing.
The memory is being released on mlx5e_flow_put() which is called
also on error flow.

Signed-off-by: Roi Dayan <roid@nvidia.com>
Reviewed-by: Oz Shlomo <ozsh@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

drivers/net/ethernet/mellanox/mlx5/core/en/tc/act/act.h

@@ -25,7 +25,6 @@ struct mlx5e_tc_act_parse_state {
 	int ifindexes[MLX5_MAX_FLOW_FWD_VPORTS];
 	int if_count;
 	struct mlx5_tc_ct_priv *ct_priv;
-	struct mlx5e_sample_attr sample_attr;
 };
 
 struct mlx5e_tc_act {

drivers/net/ethernet/mellanox/mlx5/core/en/tc/act/sample.c

@@ -27,7 +27,11 @@ tc_act_parse_sample(struct mlx5e_tc_act_parse_state *parse_state,
 		    struct mlx5e_priv *priv,
 		    struct mlx5_flow_attr *attr)
 {
-	struct mlx5e_sample_attr *sample_attr = &parse_state->sample_attr;
+	struct mlx5e_sample_attr *sample_attr;
+
+	sample_attr = kzalloc(sizeof(*attr->sample_attr), GFP_KERNEL);
+	if (!sample_attr)
+		return -ENOMEM;
 
 	sample_attr->rate = act->sample.rate;
 	sample_attr->group_num = act->sample.psample_group->group_num;
@@ -35,6 +39,7 @@ tc_act_parse_sample(struct mlx5e_tc_act_parse_state *parse_state,
 	if (act->sample.truncate)
 		sample_attr->trunc_size = act->sample.trunc_size;
 
+	attr->sample_attr = sample_attr;
 	flow_flag_set(parse_state->flow, SAMPLE);
 
 	return 0;

drivers/net/ethernet/mellanox/mlx5/core/en_tc.c

@@ -3425,16 +3425,6 @@ parse_tc_fdb_actions(struct mlx5e_priv *priv,
 		return -EOPNOTSUPP;
 	}
 
-	/* Allocate sample attribute only when there is a sample action and
-	 * no errors after parsing.
-	 */
-	if (flow_flag_test(flow, SAMPLE)) {
-		attr->sample_attr = kzalloc(sizeof(*attr->sample_attr), GFP_KERNEL);
-		if (!attr->sample_attr)
-			return -ENOMEM;
-		*attr->sample_attr = parse_state->sample_attr;
-	}
-
 	return 0;
 }