Merge pull request #8027 from hppritcha/topic/patch_ofi_mtl_for_gni_prov_v41x

OFI: patch OFI MTL for GNI provider

ompi/mca/mtl/ofi/mtl_ofi_component.c

@@ -920,6 +920,17 @@ select_prov:
         goto error;
     }
 
+    /**
+     * Unfortunately the attempt to implement FI_MR_SCALABLE in the GNI provider
+     * doesn't work, at least not well.  Since we're asking for the 1.5 libfabric
+     * API now, we have to tell GNI we want to use Mr. Basic.  Using FI_MR_BASIC
+     * rather than FI_MR_VIRT_ADDR | FI_MR_ALLOCATED | FI_MR_PROV_KEY to stay
+     * compatible with older libfabrics.
+     */
+    if (!strncmp(prov->fabric_attr->prov_name,"gni",3)) {
+         prov->domain_attr->mr_mode = FI_MR_BASIC;
+    }
+
     /**
      * Create the access domain, which is the physical or virtual network or
      * hardware port/collection of ports.  Returns a domain object that can be