[dpdk-dev] [PATCH 3/8] net/mlx5: improve Verbs flow priority discover for scalable

[Xueming Li]

To detect number flow Verbs flow priorities, PMD try to create Verbs
flows in different priority. While Verbs is not designed to support
ports larger than 255.

When DevX supported by kernel driver, 16 Verbs priorities must be
supported, no need to create Verbs flows.

Signed-off-by: Xueming Li <xuemingl at nvidia.com>
---
 drivers/net/mlx5/mlx5_flow_verbs.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/net/mlx5/mlx5_flow_verbs.c b/drivers/net/mlx5/mlx5_flow_verbs.c
index b93fd4d2c96..93bffa4a0b9 100644
--- a/drivers/net/mlx5/mlx5_flow_verbs.c
+++ b/drivers/net/mlx5/mlx5_flow_verbs.c
@@ -83,6 +83,11 @@ mlx5_flow_discover_priorities(struct rte_eth_dev *dev)
 	int i;
 	int priority = 0;
 
+#ifdef HAVE_MLX5DV_DR_DEVX_PORT
+	/* If DevX supported, driver must support 16 verbs flow priorities. */
+	priority = RTE_DIM(priority_map_5);
+	goto out;
+#endif
 	if (!drop->qp) {
 		rte_errno = ENOTSUP;
 		return -rte_errno;
@@ -109,6 +114,9 @@ mlx5_flow_discover_priorities(struct rte_eth_dev *dev)
 			dev->data->port_id, priority);
 		return -rte_errno;
 	}
+#ifdef HAVE_MLX5DV_DR_DEVX_PORT
+out:
+#endif
 	DRV_LOG(INFO, "port %u supported flow priorities:"
 		" 0-%d for ingress or egress root table,"
 		" 0-%d for non-root table or transfer root table.",
-- 
2.33.0