validate_test_and_buf_vecs (&test_data, &data_buf, svm_fifo_size (f));
rv = svm_fifo_enqueue (f, svm_fifo_size (f), test_data);
validate_test_and_buf_vecs (&test_data, &data_buf, svm_fifo_size (f));
rv = svm_fifo_enqueue (f, svm_fifo_size (f), test_data);