net/mlx5e: TC, reuse flow attribute post parser processing

After the tc action parsing phase the flow attribute is initialized with
relevant eswitch offload objects such as tunnel, vlan, header modify and
counter attributes. The post processing is done both for fdb and post-action
attributes.

Reuse the flow attribute post parsing logic by both fdb and post-action
offloads.
Signed-off-by: Oz Shlomo <ozsh@nvidia.com>
Reviewed-by: Roi Dayan <roid@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Link: https://lore.kernel.org/r/20221203221337.29267-4-saeed@kernel.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

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

@@ -606,6 +606,12 @@ int mlx5e_get_flow_namespace(struct mlx5e_tc_flow *flow)
 		MLX5_FLOW_NAMESPACE_FDB : MLX5_FLOW_NAMESPACE_KERNEL;
 }
 
+static struct mlx5_core_dev *
+get_flow_counter_dev(struct mlx5e_tc_flow *flow)
+{
+	return mlx5e_is_eswitch_flow(flow) ? flow->attr->esw_attr->counter_dev : flow->priv->mdev;
+}
+
 static struct mod_hdr_tbl *
 get_mod_hdr_table(struct mlx5e_priv *priv, struct mlx5e_tc_flow *flow)
 {
@@ -1718,6 +1724,48 @@ clean_encap_dests(struct mlx5e_priv *priv,
 	}
 }
 
+static int
+post_process_attr(struct mlx5e_tc_flow *flow,
+		  struct mlx5_flow_attr *attr,
+		  bool is_post_act_attr,
+		  struct netlink_ext_ack *extack)
+{
+	struct mlx5_eswitch *esw = flow->priv->mdev->priv.eswitch;
+	bool vf_tun;
+	int err = 0;
+
+	err = set_encap_dests(flow->priv, flow, attr, extack, &vf_tun);
+	if (err)
+		goto err_out;
+
+	if (mlx5e_is_eswitch_flow(flow)) {
+		err = mlx5_eswitch_add_vlan_action(esw, attr);
+		if (err)
+			goto err_out;
+	}
+
+	if (attr->action & MLX5_FLOW_CONTEXT_ACTION_MOD_HDR) {
+		if (vf_tun || is_post_act_attr) {
+			err = mlx5e_tc_add_flow_mod_hdr(flow->priv, flow, attr);
+			if (err)
+				goto err_out;
+		} else {
+			err = mlx5e_attach_mod_hdr(flow->priv, flow, attr->parse_attr);
+			if (err)
+				goto err_out;
+		}
+	}
+
+	if (attr->action & MLX5_FLOW_CONTEXT_ACTION_COUNT) {
+		err = alloc_flow_attr_counter(get_flow_counter_dev(flow), attr);
+		if (err)
+			goto err_out;
+	}
+
+err_out:
+	return err;
+}
+
 static int
 mlx5e_tc_add_fdb_flow(struct mlx5e_priv *priv,
 		      struct mlx5e_tc_flow *flow,
@@ -1728,7 +1776,6 @@ mlx5e_tc_add_fdb_flow(struct mlx5e_priv *priv,
 	struct mlx5_flow_attr *attr = flow->attr;
 	struct mlx5_esw_flow_attr *esw_attr;
 	u32 max_prio, max_chain;
-	bool vf_tun;
 	int err = 0;
 
 	parse_attr = attr->parse_attr;
@@ -1818,32 +1865,10 @@ mlx5e_tc_add_fdb_flow(struct mlx5e_priv *priv,
 		esw_attr->int_port = int_port;
 	}
 
-	err = set_encap_dests(priv, flow, attr, extack, &vf_tun);
-	if (err)
-		goto err_out;
-
-	err = mlx5_eswitch_add_vlan_action(esw, attr);
+	err = post_process_attr(flow, attr, false, extack);
 	if (err)
 		goto err_out;
 
-	if (attr->action & MLX5_FLOW_CONTEXT_ACTION_MOD_HDR) {
-		if (vf_tun) {
-			err = mlx5e_tc_add_flow_mod_hdr(priv, flow, attr);
-			if (err)
-				goto err_out;
-		} else {
-			err = mlx5e_attach_mod_hdr(priv, flow, parse_attr);
-			if (err)
-				goto err_out;
-		}
-	}
-
-	if (attr->action & MLX5_FLOW_CONTEXT_ACTION_COUNT) {
-		err = alloc_flow_attr_counter(esw_attr->counter_dev, attr);
-		if (err)
-			goto err_out;
-	}
-
 	/* we get here if one of the following takes place:
 	 * (1) there's no error
 	 * (2) there's an encap action and we don't have valid neigh
@@ -3639,12 +3664,6 @@ mlx5e_clone_flow_attr_for_post_act(struct mlx5_flow_attr *attr,
 	return attr2;
 }
 
-static struct mlx5_core_dev *
-get_flow_counter_dev(struct mlx5e_tc_flow *flow)
-{
-	return mlx5e_is_eswitch_flow(flow) ? flow->attr->esw_attr->counter_dev : flow->priv->mdev;
-}
-
 struct mlx5_flow_attr *
 mlx5e_tc_get_encap_attr(struct mlx5e_tc_flow *flow)
 {
@@ -3754,7 +3773,6 @@ alloc_flow_post_acts(struct mlx5e_tc_flow *flow, struct netlink_ext_ack *extack)
 	struct mlx5e_post_act *post_act = get_post_action(flow->priv);
 	struct mlx5_flow_attr *attr, *next_attr = NULL;
 	struct mlx5e_post_act_handle *handle;
-	bool vf_tun;
 	int err;
 
 	/* This is going in reverse order as needed.
@@ -3776,26 +3794,14 @@ alloc_flow_post_acts(struct mlx5e_tc_flow *flow, struct netlink_ext_ack *extack)
 		if (list_is_last(&attr->list, &flow->attrs))
 			break;
 
-		err = set_encap_dests(flow->priv, flow, attr, extack, &vf_tun);
+		err = actions_prepare_mod_hdr_actions(flow->priv, flow, attr, extack);
 		if (err)
 			goto out_free;
 
-		err = actions_prepare_mod_hdr_actions(flow->priv, flow, attr, extack);
+		err = post_process_attr(flow, attr, true, extack);
 		if (err)
 			goto out_free;
 
-		if (attr->action & MLX5_FLOW_CONTEXT_ACTION_MOD_HDR) {
-			err = mlx5e_tc_add_flow_mod_hdr(flow->priv, flow, attr);
-			if (err)
-				goto out_free;
-		}
-
-		if (attr->action & MLX5_FLOW_CONTEXT_ACTION_COUNT) {
-			err = alloc_flow_attr_counter(get_flow_counter_dev(flow), attr);
-			if (err)
-				goto out_free;
-		}
-
 		handle = mlx5e_tc_post_act_add(post_act, attr);
 		if (IS_ERR(handle)) {
 			err = PTR_ERR(handle);