__mlxsw_item_set64
__mlxsw_item_set64(buf, &__ITEM_NAME(_type, _cname, _iname), 0, val); \
__mlxsw_item_set64(buf, &__ITEM_NAME(_type, _cname, _iname), \
__mlxsw_item_set64(output + block_layout->offset,