[dpdk-dev] [PATCH 11/11] net/mlx5: add runtime parameter to enable Direct Verbs

[Yongseok Koh <yskoh@mellanox.com>]

From: Ori Kam <orika@mellanox.com>

DV flow API is based on new kernel API and is
missing some functionality like counter but add other functionality
like encap.

In order not to affect current users even if the kernel supports
the new DV API it should be enabled only manually.

Signed-off-by: Ori Kam <orika@mellanox.com>
Acked-by: Yongseok Koh <yskoh@mellanox.com>
---
 doc/guides/nics/mlx5.rst     | 7 +++++++
 drivers/net/mlx5/mlx5.c      | 6 ++++++
 drivers/net/mlx5/mlx5.h      | 1 +
 drivers/net/mlx5/mlx5_flow.c | 9 +++++++--
 4 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/doc/guides/nics/mlx5.rst b/doc/guides/nics/mlx5.rst
index dbdb90b59..67696283e 100644
--- a/doc/guides/nics/mlx5.rst
+++ b/doc/guides/nics/mlx5.rst
@@ -397,6 +397,13 @@ Run-time configuration
 
   Disabled by default.
 
+- ``dv_flow_en`` parameter [int]
+
+  A nonzero value enables the DV flow steering assuming it is supported
+  by the driver.
+
+  Disabled by default.
+
 - ``representor`` parameter [list]
 
   This parameter can be used to instantiate DPDK Ethernet devices from
diff --git a/drivers/net/mlx5/mlx5.c b/drivers/net/mlx5/mlx5.c
index f65cedb08..d5936091b 100644
--- a/drivers/net/mlx5/mlx5.c
+++ b/drivers/net/mlx5/mlx5.c
@@ -90,6 +90,9 @@
 /* Allow L3 VXLAN flow creation. */
 #define MLX5_L3_VXLAN_EN "l3_vxlan_en"
 
+/* Activate DV flow steering. */
+#define MLX5_DV_FLOW_EN "dv_flow_en"
+
 /* Activate Netlink support in VF mode. */
 #define MLX5_VF_NL_EN "vf_nl_en"
 
@@ -491,6 +494,8 @@ mlx5_args_check(const char *key, const char *val, void *opaque)
 		config->l3_vxlan_en = !!tmp;
 	} else if (strcmp(MLX5_VF_NL_EN, key) == 0) {
 		config->vf_nl_en = !!tmp;
+	} else if (strcmp(MLX5_DV_FLOW_EN, key) == 0) {
+		config->dv_flow_en = !!tmp;
 	} else {
 		DRV_LOG(WARNING, "%s: unknown parameter", key);
 		rte_errno = EINVAL;
@@ -528,6 +533,7 @@ mlx5_args(struct mlx5_dev_config *config, struct rte_devargs *devargs)
 		MLX5_RX_VEC_EN,
 		MLX5_L3_VXLAN_EN,
 		MLX5_VF_NL_EN,
+		MLX5_DV_FLOW_EN,
 		MLX5_REPRESENTOR,
 		NULL,
 	};
diff --git a/drivers/net/mlx5/mlx5.h b/drivers/net/mlx5/mlx5.h
index 1207edf91..006cc8e06 100644
--- a/drivers/net/mlx5/mlx5.h
+++ b/drivers/net/mlx5/mlx5.h
@@ -110,6 +110,7 @@ struct mlx5_dev_config {
 	unsigned int mpw_hdr_dseg:1; /* Enable DSEGs in the title WQEBB. */
 	unsigned int l3_vxlan_en:1; /* Enable L3 VXLAN flow creation. */
 	unsigned int vf_nl_en:1; /* Enable Netlink requests in VF mode. */
+	unsigned int dv_flow_en:1; /* Enable DV flow. */
 	unsigned int swp:1; /* Tx generic tunnel checksum and TSO offload. */
 	struct {
 		unsigned int enabled:1; /* Whether MPRQ is enabled. */
diff --git a/drivers/net/mlx5/mlx5_flow.c b/drivers/net/mlx5/mlx5_flow.c
index 6aec6b1d8..677cc7a32 100644
--- a/drivers/net/mlx5/mlx5_flow.c
+++ b/drivers/net/mlx5/mlx5_flow.c
@@ -2472,10 +2472,15 @@ mlx5_dev_filter_ctrl(struct rte_eth_dev *dev,
  *   Pointer to Ethernet device structure.
  */
 void
-mlx5_flow_init_driver_ops(struct rte_eth_dev *dev __rte_unused)
+mlx5_flow_init_driver_ops(struct rte_eth_dev *dev)
 {
+	struct priv *priv __rte_unused = dev->data->dev_private;
+
 #ifdef HAVE_IBV_FLOW_DV_SUPPORT
-	mlx5_flow_dv_get_driver_ops(&nic_ops);
+	if (priv->config.dv_flow_en)
+		mlx5_flow_dv_get_driver_ops(&nic_ops);
+	else
+		mlx5_flow_verbs_get_driver_ops(&nic_ops);
 #else
 	mlx5_flow_verbs_get_driver_ops(&nic_ops);
 #endif
-- 
2.11.0