ch4/ofi: Convert CUDA device id to handle for fi_mr_regattr

Libfabric docs say that the value of the cuda field in the regattr
struct is the device handle gotten from cuDeviceGet, not the
ordinal. Fixes pmodels#7148.

src/mpid/ch4/netmod/ofi/ofi_impl.h

@@ -11,6 +11,9 @@
 #include "ofi_types.h"
 #include "mpidch4r.h"
 #include "ch4_impl.h"
+#ifdef MPL_HAVE_CUDA
+#include <cuda.h>       /* for cuDeviceGet */
+#endif
 
 extern unsigned long long PVAR_COUNTER_nic_sent_bytes_count[MPIDI_OFI_MAX_NICS] ATTRIBUTE((unused));
 extern unsigned long long PVAR_COUNTER_nic_recvd_bytes_count[MPIDI_OFI_MAX_NICS]
@@ -707,8 +710,15 @@ MPL_STATIC_INLINE_PREFIX int MPIDI_OFI_register_memory(char *send_buf, size_t da
     mr_attr.context = NULL;
     if (MPL_gpu_attr_is_strict_dev(attr)) {
 #ifdef MPL_HAVE_CUDA
+        CUdevice device;
+        int dev_id;
+
+        /* libfabric says to get the device handle from cuDeviceGet */
+        dev_id = MPL_gpu_get_dev_id_from_attr(attr);
+        cuDeviceGet(&device, dev_id);
+
         mr_attr.iface = FI_HMEM_CUDA;
-        mr_attr.device.cuda = MPL_gpu_get_dev_id_from_attr(attr);
+        mr_attr.device.cuda = device;
 #elif defined MPL_HAVE_ZE
         /* OFI does not support tiles yet, need to pass the root device. */
         mr_attr.iface = FI_HMEM_ZE;