Re: [PATCH 16/16] migration/multifd: Add integration tests for multifd with Intel DSA offloading.

[Fabiano Rosas <farosas@suse.de>]

Hao Xiang <hao.xiang@bytedance.com> writes:

> * Add test case to start and complete multifd live migration with DSA
> offloading enabled.
> * Add test case to start and cancel multifd live migration with DSA
> offloading enabled.
>
> Signed-off-by: Bryan Zhang <bryan.zhang@bytedance.com>
> Signed-off-by: Hao Xiang <hao.xiang@bytedance.com>
> ---
>  tests/qtest/migration-test.c | 66 +++++++++++++++++++++++++++++++++++-
>  1 file changed, 65 insertions(+), 1 deletion(-)
>
> diff --git a/tests/qtest/migration-test.c b/tests/qtest/migration-test.c
> index 8eb2053dbb..f22d39e72e 100644
> --- a/tests/qtest/migration-test.c
> +++ b/tests/qtest/migration-test.c
> @@ -631,6 +631,12 @@ typedef struct {
>      const char *opts_target;
>  } MigrateStart;
>  
> +/*
> + * It requires separate steps to configure and enable DSA device.
> + * This test assumes that the configuration is done already.
> + */
> +static const char* dsa_dev_path = "/dev/dsa/wq4.0";

Hmm, this is tricky. No developer is going to have this setup neither
will our CI. So it might be that this test just sits there and never
gets executed. I have to think more about this.

Nonetheless, you should check that the file exists and skip the test if
it doesn't.

> +
>  /*
>   * A hook that runs after the src and dst QEMUs have been
>   * created, but before the migration is started. This can
> @@ -2431,7 +2437,7 @@ static void test_multifd_tcp_tls_x509_reject_anon_client(void)
>   *
>   *  And see that it works
>   */
> -static void test_multifd_tcp_cancel(void)
> +static void test_multifd_tcp_cancel_common(bool use_dsa)
>  {
>      MigrateStart args = {
>          .hide_stderr = true,
> @@ -2452,6 +2458,10 @@ static void test_multifd_tcp_cancel(void)
>      migrate_set_capability(from, "multifd", true);
>      migrate_set_capability(to, "multifd", true);
>  
> +    if (use_dsa) {
> +        migrate_set_parameter_str(from, "multifd-dsa-accel", dsa_dev_path);
> +    }
> +
>      /* Start incoming migration from the 1st socket */
>      migrate_incoming_qmp(to, "tcp:127.0.0.1:0", "{}");
>  
> @@ -2508,6 +2518,48 @@ static void test_multifd_tcp_cancel(void)
>      test_migrate_end(from, to2, true);
>  }
>  
> +/*
> + * This test does:
> + *  source               target
> + *                       migrate_incoming
> + *     migrate
> + *     migrate_cancel
> + *                       launch another target
> + *     migrate
> + *
> + *  And see that it works
> + */
> +static void test_multifd_tcp_cancel(void)
> +{
> +    test_multifd_tcp_cancel_common(false);
> +}
> +
> +#ifdef CONFIG_DSA_OPT
> +
> +static void *test_migrate_precopy_tcp_multifd_start_dsa(QTestState *from,
> +                                                        QTestState *to)
> +{
> +    migrate_set_parameter_str(from, "multifd-dsa-accel", dsa_dev_path);
> +    return test_migrate_precopy_tcp_multifd_start_common(from, to, "none");
> +}
> +
> +static void test_multifd_tcp_none_dsa(void)
> +{
> +    MigrateCommon args = {
> +        .listen_uri = "defer",
> +        .start_hook = test_migrate_precopy_tcp_multifd_start_dsa,
> +    };
> +
> +    test_precopy_common(&args);
> +}
> +
> +static void test_multifd_tcp_cancel_dsa(void)
> +{
> +    test_multifd_tcp_cancel_common(true);
> +}
> +
> +#endif
> +
>  static void calc_dirty_rate(QTestState *who, uint64_t calc_time)
>  {
>      qtest_qmp_assert_success(who,
> @@ -2921,6 +2973,18 @@ int main(int argc, char **argv)
>      }
>      qtest_add_func("/migration/multifd/tcp/plain/none",
>                     test_multifd_tcp_none);
> +
> +#ifdef CONFIG_DSA_OPT
> +    if (g_str_equal(arch, "x86_64")) {
> +        qtest_add_func("/migration/multifd/tcp/plain/none/dsa",
> +                       test_multifd_tcp_none_dsa);
> +    }
> +    if (getenv("QEMU_TEST_FLAKY_TESTS")) {

It's safe to not use FLAKY here. This test already requires special
setup.

We have also fixed the cancel test a while back. We will remove the
flaky tag from it soon.