i40e/i40evf: Add WB_ON_ITR offload support

X722 has a way to work around the descriptor WB issue,
this offload helps turn that feature on.

Change-ID: I7ffa67622426bfca5a651417b63e3afcfeb60412
Signed-off-by: Anjali Singhai Jain <anjali.singhai@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
diff --git a/drivers/net/ethernet/intel/i40e/i40e_virtchnl.h b/drivers/net/ethernet/intel/i40e/i40e_virtchnl.h
index 95d0f8c..ae87982 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_virtchnl.h
+++ b/drivers/net/ethernet/intel/i40e/i40e_virtchnl.h
@@ -150,6 +150,7 @@
 #define I40E_VIRTCHNL_VF_OFFLOAD_FCOE		0x00000004
 #define I40E_VIRTCHNL_VF_OFFLOAD_RSS_AQ		0x00000008
 #define I40E_VIRTCHNL_VF_OFFLOAD_RSS_REG	0x00000010
+#define I40E_VIRTCHNL_VF_OFFLOAD_WB_ON_ITR	0x00000020
 #define I40E_VIRTCHNL_VF_OFFLOAD_VLAN		0x00010000
 #define I40E_VIRTCHNL_VF_OFFLOAD_RX_POLLING	0x00020000