net/mlx5: Set SMFS as a default steering mode if device supports it

Set SMFS (SW-managed flow steering) as a default steering mode
instead of DMFS (device-managed flow steering)

In SMFS, the driver writes the STEs (Steering Table Entries) directly
to the device's ICM, which allows for a higher rule insertion rate
than through using FW command interface, as it is done in DMFS.

SMFS/DMFS steering modes can be configured through devlink param
'flow_steering_mode'. The possible values are 'smfs' or 'dmfs'.
The desired 'flow_steering_mode' param value should be set before
enabling switchdev mode.

Example:

  # devlink dev param set pci/0000:05:00.0 name flow_steering_mode smfs
  # devlink dev eswitch set pci/0000:05:00.0 mode switchdev
Signed-off-by: Yevgeny Kliteynik <kliteyn@nvidia.com>

drivers/net/ethernet/mellanox/mlx5/core/fs_core.c

@@ -3083,6 +3083,11 @@ int mlx5_init_fs(struct mlx5_core_dev *dev)
 	steering->dev = dev;
 	dev->priv.steering = steering;
 
+	if (mlx5_fs_dr_is_supported(dev))
+		steering->mode = MLX5_FLOW_STEERING_MODE_SMFS;
+	else
+		steering->mode = MLX5_FLOW_STEERING_MODE_DMFS;
+
 	steering->fgs_cache = kmem_cache_create("mlx5_fs_fgs",
 						sizeof(struct mlx5_flow_group), 0,
 						0, NULL);