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Date:   Tue, 22 Sep 2020 21:49:10 -0700
From:   John Fastabend <john.fastabend@...il.com>
To:     Song Liu <songliubraving@...com>, netdev@...r.kernel.org,
        bpf@...r.kernel.org
Cc:     kernel-team@...com, ast@...nel.org, daniel@...earbox.net,
        john.fastabend@...il.com, kpsingh@...omium.org,
        Song Liu <songliubraving@...com>
Subject: RE: [PATCH bpf-next 3/3] selftests/bpf: add raw_tp_test_run

Song Liu wrote:
> This test runs test_run for raw_tracepoint program. The test covers ctx
> input, retval output, and proper handling of cpu_plus field.
> 
> Signed-off-by: Song Liu <songliubraving@...com>
> ---

[...]

> +
> +	test_attr.ctx_size_in = sizeof(args);
> +	err = bpf_prog_test_run_xattr(&test_attr);
> +	CHECK(err < 0, "test_run", "err %d\n", errno);
> +	CHECK(test_attr.retval != expected_retval, "check_retval",
> +	      "expect 0x%x, got 0x%x\n", expected_retval, test_attr.retval);
> +
> +	for (i = 0; i < nr_online; i++)
> +		if (online[i]) {
> +			DECLARE_LIBBPF_OPTS(bpf_prog_test_run_opts, opts,
> +				.cpu_plus = i + 1,
> +			);
> +			err = bpf_prog_test_run_xattr_opts(&test_attr, &opts);
> +			CHECK(err < 0, "test_run_with_opts", "err %d\n", errno);
> +			CHECK(skel->data->on_cpu != i, "check_on_cpu",
> +			      "got wrong value\n");

Should we also check retval here just to be thorough?

Thanks,
John

> +		}
> +cleanup:
> +	close(comm_fd);
> +	test_raw_tp_test_run__destroy(skel);
> +	free(online);
> +}
> diff --git a/tools/testing/selftests/bpf/progs/test_raw_tp_test_run.c b/tools/testing/selftests/bpf/progs/test_raw_tp_test_run.c

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