[dpdk-dev] [PATCH v4 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>
Acked-by: Viacheslav Ovsiienko <viacheslavo 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 60029f71178..3f5aaa885fb 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;
 
+#if defined(HAVE_MLX5DV_DR_DEVX_PORT) || defined(HAVE_MLX5DV_DR_DEVX_PORT_V35)
+	/* 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;
 	}
+#if defined(HAVE_MLX5DV_DR_DEVX_PORT) || defined(HAVE_MLX5DV_DR_DEVX_PORT_V35)
+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