net/mlx5e: CT, Don't set flow flag CT for ct clear flow

ct clear action is a normal flow with a modify header for registers to
0. there is no need for any special handling in tc_ct.c.
Parsing of ct clear action still allocates mod acts to set 0 on the
registers and the driver continue to add a normal rule with modify hdr
context.
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/ct.c

@@ -43,13 +43,14 @@ tc_act_parse_ct(struct mlx5e_tc_act_parse_state *parse_state,
 	if (err)
 		return err;
 
-	flow_flag_set(parse_state->flow, CT);
 
 	if (mlx5e_is_eswitch_flow(parse_state->flow))
 		attr->esw_attr->split_count = attr->esw_attr->out_count;
 
-	if (!clear_action)
+	if (!clear_action) {
+		flow_flag_set(parse_state->flow, CT);
 		parse_state->ct = true;
+	}
 
 	return 0;
 }

drivers/net/ethernet/mellanox/mlx5/core/en/tc_ct.c

@@ -1926,68 +1926,6 @@ __mlx5_tc_ct_flow_offload(struct mlx5_tc_ct_priv *ct_priv,
 	return ERR_PTR(err);
 }
 
-static struct mlx5_flow_handle *
-__mlx5_tc_ct_flow_offload_clear(struct mlx5_tc_ct_priv *ct_priv,
-				struct mlx5_flow_spec *orig_spec,
-				struct mlx5_flow_attr *attr,
-				struct mlx5e_tc_mod_hdr_acts *mod_acts)
-{
-	struct mlx5e_priv *priv = netdev_priv(ct_priv->netdev);
-	u32 attr_sz = ns_to_attr_sz(ct_priv->ns_type);
-	struct mlx5_flow_attr *pre_ct_attr;
-	struct mlx5_modify_hdr *mod_hdr;
-	struct mlx5_flow_handle *rule;
-	struct mlx5_ct_flow *ct_flow;
-	int err;
-
-	ct_flow = kzalloc(sizeof(*ct_flow), GFP_KERNEL);
-	if (!ct_flow)
-		return ERR_PTR(-ENOMEM);
-
-	/* Base esw attributes on original rule attribute */
-	pre_ct_attr = mlx5_alloc_flow_attr(ct_priv->ns_type);
-	if (!pre_ct_attr) {
-		err = -ENOMEM;
-		goto err_attr;
-	}
-
-	memcpy(pre_ct_attr, attr, attr_sz);
-
-	mod_hdr = mlx5_modify_header_alloc(priv->mdev, ct_priv->ns_type,
-					   mod_acts->num_actions,
-					   mod_acts->actions);
-	if (IS_ERR(mod_hdr)) {
-		err = PTR_ERR(mod_hdr);
-		ct_dbg("Failed to add create ct clear mod hdr");
-		goto err_mod_hdr;
-	}
-
-	pre_ct_attr->modify_hdr = mod_hdr;
-
-	rule = mlx5_tc_rule_insert(priv, orig_spec, pre_ct_attr);
-	if (IS_ERR(rule)) {
-		err = PTR_ERR(rule);
-		ct_dbg("Failed to add ct clear rule");
-		goto err_insert;
-	}
-
-	attr->ct_attr.ct_flow = ct_flow;
-	ct_flow->pre_ct_attr = pre_ct_attr;
-	ct_flow->pre_ct_rule = rule;
-	return rule;
-
-err_insert:
-	mlx5_modify_header_dealloc(priv->mdev, mod_hdr);
-err_mod_hdr:
-	netdev_warn(priv->netdev,
-		    "Failed to offload ct clear flow, err %d\n", err);
-	kfree(pre_ct_attr);
-err_attr:
-	kfree(ct_flow);
-
-	return ERR_PTR(err);
-}
-
 struct mlx5_flow_handle *
 mlx5_tc_ct_flow_offload(struct mlx5_tc_ct_priv *priv,
 			struct mlx5e_tc_flow *flow,
@@ -1995,18 +1933,13 @@ mlx5_tc_ct_flow_offload(struct mlx5_tc_ct_priv *priv,
 			struct mlx5_flow_attr *attr,
 			struct mlx5e_tc_mod_hdr_acts *mod_hdr_acts)
 {
-	bool clear_action = attr->ct_attr.ct_action & TCA_CT_ACT_CLEAR;
 	struct mlx5_flow_handle *rule;
 
 	if (!priv)
 		return ERR_PTR(-EOPNOTSUPP);
 
 	mutex_lock(&priv->control_lock);
-
-	if (clear_action)
-		rule = __mlx5_tc_ct_flow_offload_clear(priv, spec, attr, mod_hdr_acts);
-	else
-		rule = __mlx5_tc_ct_flow_offload(priv, flow, spec, attr);
+	rule = __mlx5_tc_ct_flow_offload(priv, flow, spec, attr);
 	mutex_unlock(&priv->control_lock);
 
 	return rule;
@@ -2020,8 +1953,7 @@ __mlx5_tc_ct_delete_flow(struct mlx5_tc_ct_priv *ct_priv,
 	struct mlx5_flow_attr *pre_ct_attr = ct_flow->pre_ct_attr;
 	struct mlx5e_priv *priv = netdev_priv(ct_priv->netdev);
 
-	mlx5_tc_rule_delete(priv, ct_flow->pre_ct_rule,
-			    pre_ct_attr);
+	mlx5_tc_rule_delete(priv, ct_flow->pre_ct_rule, pre_ct_attr);
 	mlx5_modify_header_dealloc(priv->mdev, pre_ct_attr->modify_hdr);
 
 	if (ct_flow->post_act_handle) {

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

@@ -1574,8 +1574,7 @@ mlx5e_tc_add_fdb_flow(struct mlx5e_priv *priv,
 	if (err)
 		goto err_out;
 
-	if (attr->action & MLX5_FLOW_CONTEXT_ACTION_MOD_HDR &&
-	    !(attr->ct_attr.ct_action & TCA_CT_ACT_CLEAR)) {
+	if (attr->action & MLX5_FLOW_CONTEXT_ACTION_MOD_HDR) {
 		if (vf_tun) {
 			err = mlx5e_tc_add_flow_mod_hdr(priv, flow, attr);
 			if (err)