ixgbe: reset before SRIOV init to avoid mailbox issues

Enabling SRIOV while the ixgbevf driver is loaded will result in all
mailbox requests from ixgbevf_open() being rejected by ixgbe because
adapter->clear_to_send is set to false on reset.

Call ixgbe_sriov_reinit() before pci_enable_sriov() to make sure that
mailbox requests are handled from the time ixgbevf is loaded.

Reported-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Emil Tantilov <emil.s.tantilov@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c

@@ -329,13 +329,15 @@ static int ixgbe_pci_sriov_enable(struct pci_dev *dev, int num_vfs)
 	for (i = 0; i < adapter->num_vfs; i++)
 		ixgbe_vf_configuration(dev, (i | 0x10000000));
 
+	/* reset before enabling SRIOV to avoid mailbox issues */
+	ixgbe_sriov_reinit(adapter);
+
 	err = pci_enable_sriov(dev, num_vfs);
 	if (err) {
 		e_dev_warn("Failed to enable PCI sriov: %d\n", err);
 		return err;
 	}
 	ixgbe_get_vfs(adapter);
-	ixgbe_sriov_reinit(adapter);
 
 	return num_vfs;
 #else