Index: head/sys/net/iflib.h
===================================================================
--- head/sys/net/iflib.h
+++ head/sys/net/iflib.h
@@ -399,6 +399,13 @@
 int iflib_device_resume(device_t);
 int iflib_device_shutdown(device_t);
 
+/*
+ * Use this instead of iflib_device_probe if the driver should report
+ * BUS_PROBE_VENDOR instead of BUS_PROBE_DEFAULT. (For example, an out-of-tree
+ * driver based on iflib).
+ */
+int iflib_device_probe_vendor(device_t);
+
 
 int iflib_device_iov_init(device_t, uint16_t, const nvlist_t *);
 void iflib_device_iov_uninit(device_t);
Index: head/sys/net/iflib.c
===================================================================
--- head/sys/net/iflib.c
+++ head/sys/net/iflib.c
@@ -4377,6 +4377,18 @@
 	return (ENXIO);
 }
 
+int
+iflib_device_probe_vendor(device_t dev)
+{
+	int probe;
+
+	probe = iflib_device_probe(dev);
+	if (probe == BUS_PROBE_DEFAULT)
+		return (BUS_PROBE_VENDOR);
+	else
+		return (probe);
+}
+
 static void
 iflib_reset_qvalues(if_ctx_t ctx)
 {