[RFC 8/9] net/mlx5: return error for sws modify field

[Rongwei Liu]

Return unsupported error message when application tries to
modify flex item field.

Signed-off-by: Rongwei Liu <rongw...@nvidia.com>
---
 drivers/net/mlx5/mlx5_flow_dv.c | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/drivers/net/mlx5/mlx5_flow_dv.c b/drivers/net/mlx5/mlx5_flow_dv.c
index 110d08b271..f9419463eb 100644
--- a/drivers/net/mlx5/mlx5_flow_dv.c
+++ b/drivers/net/mlx5/mlx5_flow_dv.c
@@ -4824,10 +4824,18 @@ flow_dv_validate_action_modify_hdr(const uint64_t 
action_flags,
                                   const struct rte_flow_action *action,
                                   struct rte_flow_error *error)
 {
+       const struct rte_flow_action_modify_field *action_modify_field = 
action->conf;
+
        if (action->type != RTE_FLOW_ACTION_TYPE_DEC_TTL && !action->conf)
                return rte_flow_error_set(error, EINVAL,
                                          RTE_FLOW_ERROR_TYPE_ACTION_CONF,
                                          NULL, "action configuration not set");
+       if (action_modify_field->src.field == RTE_FLOW_FIELD_FLEX_ITEM ||
+           action_modify_field->dst.field == RTE_FLOW_FIELD_FLEX_ITEM)
+               return rte_flow_error_set(error, ENOTSUP,
+                               RTE_FLOW_ERROR_TYPE_ACTION, action,
+                               "flex item fields modification"
+                               " is not supported");
        if (action_flags & MLX5_FLOW_ACTION_ENCAP)
                return rte_flow_error_set(error, EINVAL,
                                          RTE_FLOW_ERROR_TYPE_ACTION, NULL,
@@ -5153,17 +5161,16 @@ flow_dv_validate_action_modify_field(struct rte_eth_dev 
*dev,
        struct mlx5_hca_attr *hca_attr = &priv->sh->cdev->config.hca_attr;
        const struct rte_flow_action_modify_field *action_modify_field =
                action->conf;
-       uint32_t dst_width = mlx5_flow_item_field_width(dev,
-                               action_modify_field->dst.field,
-                               -1, attr, error);
-       uint32_t src_width = mlx5_flow_item_field_width(dev,
-                               action_modify_field->src.field,
-                               dst_width, attr, error);
+       uint32_t dst_width, src_width;
 
        ret = flow_dv_validate_action_modify_hdr(action_flags, action, error);
        if (ret)
                return ret;
 
+       dst_width = mlx5_flow_item_field_width(dev, 
action_modify_field->dst.field,
+                                              -1, attr, error);
+       src_width = mlx5_flow_item_field_width(dev, 
action_modify_field->src.field,
+                                              dst_width, attr, error);
        if (action_modify_field->width == 0)
                return rte_flow_error_set(error, EINVAL,
                                RTE_FLOW_ERROR_TYPE_ACTION, action,
-- 
2.27.0