net/mlx5: fix flow META item validation

When flow is inserted with meta match item it requires a certain
register support.
As part of the flow validation of such flows, the validation
function is missing a check that the mlx5 driver is not in
legacy mode in terms of extended meta data support
(MLX5_XMETA_MODE_LEGACY flag).
If the driver is in legacy mode it will cause downstream
function that allocates needed register for meta data.

The fix checks explicitly the conditions for support of
meta data in FDB mode. If the conditions are not met
an error message will be issued.

Fixes: 9bf26e1318e3 ("ethdev: move egress metadata to dynamic field")
Cc: stable@dpdk.org
Signed-off-by: Shy Shyman <shys@mellanox.com>
Acked-by: Matan Azrad <matan@mellanox.com>

diff --git a/drivers/net/mlx5/mlx5_flow_dv.c b/drivers/net/mlx5/mlx5_flow_dv.c
index 0bd1c99..8b5b683 100644 (file)
--- a/drivers/net/mlx5/mlx5_flow_dv.c
+++ b/drivers/net/mlx5/mlx5_flow_dv.c
@@ -1483,6 +1483,13 @@ flow_dv_validate_item_meta(struct rte_eth_dev *dev __rte_unused,
                                          "isn't supported");
                if (reg != REG_A)
                        nic_mask.data = priv->sh->dv_meta_mask;
+       } else if (attr->transfer) {
+               return rte_flow_error_set(error, ENOTSUP,
+                                       RTE_FLOW_ERROR_TYPE_ITEM, item,
+                                       "extended metadata feature "
+                                       "should be enabled when "
+                                       "meta item is requested "
+                                       "with e-switch mode ");
        }
        if (!mask)
                mask = &rte_flow_item_meta_mask;