i40e: Restrict VF poll mode to only single function mode devices

The VFs can request their queues to be set up into polling mode, rather
than interrupt mode, which works well for supporting things like DPDK,
but this should not be available when working in an multi-function
support device.

Change-ID: Id36792e4e7422db8f2033336507211f68f14ff6f
Signed-off-by: Shannon Nelson <shannon.nelson@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_pf.c b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
index b3539660f4f122cbba09e476676d53e982b0036c..30f8cbe6b54b00cf1d67b70fb3affccd5a213f92 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
@@ -1362,8 +1362,16 @@ static int i40e_vc_get_vf_resources_msg(struct i40e_vf *vf, u8 *msg)
                                I40E_VIRTCHNL_VF_OFFLOAD_RSS_PCTYPE_V2;
        }
 
-       if (vf->driver_caps & I40E_VIRTCHNL_VF_OFFLOAD_RX_POLLING)
+       if (vf->driver_caps & I40E_VIRTCHNL_VF_OFFLOAD_RX_POLLING) {
+               if (pf->flags & I40E_FLAG_MFP_ENABLED) {
+                       dev_err(&pf->pdev->dev,
+                               "VF %d requested polling mode: this feature is supported only when the device is running in single function per port (SFP) mode\n",
+                                vf->vf_id);
+                       ret = I40E_ERR_PARAM;
+                       goto err;
+               }
                vfres->vf_offload_flags |= I40E_VIRTCHNL_VF_OFFLOAD_RX_POLLING;
+       }
 
        if (pf->flags & I40E_FLAG_WB_ON_ITR_CAPABLE) {
                if (vf->driver_caps & I40E_VIRTCHNL_VF_OFFLOAD_WB_ON_ITR)