/*
- * PtlNIFailNid
+ * PtlFailNid
*
* Not an official Portals 3 API call. It provides a way of simulating
* communications failures to all (nid == PTL_NID_ANY), or specific peers
*/
int PtlFailNid (ptl_handle_ni_t ni, ptl_nid_t nid, unsigned int threshold);
+/*
+ * PtlLoopback
+ *
+ * Not an official Portals 3 API call. It provides a way of enabling or
+ * disabling loopback optimisation, or getting its current state.
+ */
+int PtlLoopback (ptl_handle_ni_t ni, int set, int *enabled);
+
/*
* PtlSnprintHandle:
*