Merge pull request #11075 from wckzhang/fixoffset

mtl: Fix datatype offsetting

Author: wckzhang

ompi/mca/mtl/base/mtl_base_datatype.h

@@ -46,7 +46,7 @@ ompi_mtl_datatype_pack(struct opal_convertor_t *convertor,
 						  convertor->count) &&
         !(convertor->flags & CONVERTOR_ACCELERATOR)) {
 	    *free_after = false;
-	    *buffer = convertor->pBaseBuf;
+	    *buffer = convertor->pBaseBuf + convertor->bConverted + convertor->pDesc->true_lb;
 	    *buffer_len = convertor->local_size;
 	    return OPAL_SUCCESS;
     }

ompi/mca/pml/cm/pml_cm.h

@@ -374,7 +374,7 @@ mca_pml_cm_send(const void *buf,
                 MCA_PML_CM_SWITCH_ACCELERATOR_CONVERTOR_OFF(flags, datatype, count);
                 convertor.flags      |= flags;
                 /* Sets CONVERTOR_ACCELERATOR flag if device buffer */
-                opal_convertor_prepare_for_send(&convertor, &datatype->super, count, (unsigned char *)buf + datatype->super.true_lb);
+                opal_convertor_prepare_for_send(&convertor, &datatype->super, count, (unsigned char *)buf);
     } else
 #endif
 	{