igb: Add SMBI semaphore to I210/I211

It was previously thought that, since I210/I211 are single port devices,
they did not need the SMBI semaphore. This is not the case. Add support for
the SMBI semaphore.

Signed-off-by: Matthew Vick <matthew.vick@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
diff --git a/drivers/net/ethernet/intel/igb/e1000_82575.c b/drivers/net/ethernet/intel/igb/e1000_82575.c
index c9bba39d5..6cb0ca2 100644
--- a/drivers/net/ethernet/intel/igb/e1000_82575.c
+++ b/drivers/net/ethernet/intel/igb/e1000_82575.c
@@ -389,6 +389,9 @@
 		dev_spec->eee_disable = false;
 	else
 		dev_spec->eee_disable = true;
+	/* Allow a single clear of the SW semaphore on I210 and newer */
+	if (mac->type >= e1000_i210)
+		dev_spec->clear_semaphore_once = true;
 	/* physical interface link setup */
 	mac->ops.setup_physical_interface =
 		(hw->phy.media_type == e1000_media_type_copper)