[PATCH] tests/bpf: Fix the bpf test to check for libtraceevent support

[Disha Goel]

On 1/31/23 7:20 PM, Athira Rajeev wrote:

> "bpf" tests fails in environment with missing libtraceevent
> support as below:
>
>   # ./perf test 36
>   36: BPF filter                                                      :
>   36.1: Basic BPF filtering                                           : FAILED!
>   36.2: BPF pinning                                                   : FAILED!
>   36.3: BPF prologue generation                                       : FAILED!
>
> The environment has clang but missing the libtraceevent
> devel. Hence perf is compiled without libtraceevent support.
>
> Detailed logs:
> 	./perf test -v "Basic BPF filtering"
>
> 	Failed to add BPF event syscalls:sys_enter_epoll_pwait
> 	bpf: tracepoint call back failed, stop iterate
> 	Failed to add events selected by BPF
>
> The bpf tests tris to add probe event which fails
> at "parse_events_add_tracepoint" function due to missing
> libtraceevent. Add check for "HAVE_LIBTRACEEVENT" in the
> "tests/bpf.c" before proceeding with the test.
>
> With the change,
>
> 	# ./perf test 36
>   	36: BPF filter                                                      :
>   	36.1: Basic BPF filtering                                           : Skip (not compiled in or missing libtraceevent support)
>   	36.2: BPF pinning                                                   : Skip (not compiled in or missing libtraceevent support)
>   	36.3: BPF prologue generation                                       : Skip (not compiled in or missing libtraceevent support)
>
> Signed-off-by: Athira Rajeev<atrajeev at linux.vnet.ibm.com>

Tested the patch on powerpc, perf bpf test skips when libtraceevent-devel package is not installed.

  36: BPF filter                                                      :
  36.1: Basic BPF filtering                                           : Skip (not compiled in or missing libtraceevent support)
  36.2: BPF pinning                                                   : Skip (not compiled in or missing libtraceevent support)
  36.3: BPF prologue generation                                       : Skip (not compiled in or missing libtraceevent support)

Tested-by: Disha Goel<disgoel at linux.ibm.com>

> ---
>   tools/perf/tests/bpf.c | 22 +++++++++++-----------
>   1 file changed, 11 insertions(+), 11 deletions(-)
>
> diff --git a/tools/perf/tests/bpf.c b/tools/perf/tests/bpf.c
> index 17c023823713..4af39528f611 100644
> --- a/tools/perf/tests/bpf.c
> +++ b/tools/perf/tests/bpf.c
> @@ -23,7 +23,7 @@
>   #define NR_ITERS       111
>   #define PERF_TEST_BPF_PATH "/sys/fs/bpf/perf_test"
>   
> -#ifdef HAVE_LIBBPF_SUPPORT
> +#if defined(HAVE_LIBBPF_SUPPORT) && defined(HAVE_LIBTRACEEVENT)
>   #include <linux/bpf.h>
>   #include <bpf/bpf.h>
>   
> @@ -330,10 +330,10 @@ static int test__bpf(int i)
>   static int test__basic_bpf_test(struct test_suite *test __maybe_unused,
>   				int subtest __maybe_unused)
>   {
> -#ifdef HAVE_LIBBPF_SUPPORT
> +#if defined(HAVE_LIBBPF_SUPPORT) && defined(HAVE_LIBTRACEEVENT)
>   	return test__bpf(0);
>   #else
> -	pr_debug("Skip BPF test because BPF support is not compiled\n");
> +	pr_debug("Skip BPF test because BPF or libtraceevent support is not compiled\n");
>   	return TEST_SKIP;
>   #endif
>   }
> @@ -341,10 +341,10 @@ static int test__basic_bpf_test(struct test_suite *test __maybe_unused,
>   static int test__bpf_pinning(struct test_suite *test __maybe_unused,
>   			     int subtest __maybe_unused)
>   {
> -#ifdef HAVE_LIBBPF_SUPPORT
> +#if defined(HAVE_LIBBPF_SUPPORT) && defined(HAVE_LIBTRACEEVENT)
>   	return test__bpf(1);
>   #else
> -	pr_debug("Skip BPF test because BPF support is not compiled\n");
> +	pr_debug("Skip BPF test because BPF or libtraceevent support is not compiled\n");
>   	return TEST_SKIP;
>   #endif
>   }
> @@ -352,17 +352,17 @@ static int test__bpf_pinning(struct test_suite *test __maybe_unused,
>   static int test__bpf_prologue_test(struct test_suite *test __maybe_unused,
>   				   int subtest __maybe_unused)
>   {
> -#if defined(HAVE_LIBBPF_SUPPORT) && defined(HAVE_BPF_PROLOGUE)
> +#if defined(HAVE_LIBBPF_SUPPORT) && defined(HAVE_BPF_PROLOGUE) && defined(HAVE_LIBTRACEEVENT)
>   	return test__bpf(2);
>   #else
> -	pr_debug("Skip BPF test because BPF support is not compiled\n");
> +	pr_debug("Skip BPF test because BPF or libtraceevent support is not compiled\n");
>   	return TEST_SKIP;
>   #endif
>   }
>   
>   
>   static struct test_case bpf_tests[] = {
> -#ifdef HAVE_LIBBPF_SUPPORT
> +#if defined(HAVE_LIBBPF_SUPPORT) && defined(HAVE_LIBTRACEEVENT)
>   	TEST_CASE("Basic BPF filtering", basic_bpf_test),
>   	TEST_CASE_REASON("BPF pinning", bpf_pinning,
>   			"clang isn't installed or environment missing BPF support"),
> @@ -373,9 +373,9 @@ static struct test_case bpf_tests[] = {
>   	TEST_CASE_REASON("BPF prologue generation", bpf_prologue_test, "not compiled in"),
>   #endif
>   #else
> -	TEST_CASE_REASON("Basic BPF filtering", basic_bpf_test, "not compiled in"),
> -	TEST_CASE_REASON("BPF pinning", bpf_pinning, "not compiled in"),
> -	TEST_CASE_REASON("BPF prologue generation", bpf_prologue_test, "not compiled in"),
> +	TEST_CASE_REASON("Basic BPF filtering", basic_bpf_test, "not compiled in or missing libtraceevent support"),
> +	TEST_CASE_REASON("BPF pinning", bpf_pinning, "not compiled in or missing libtraceevent support"),
> +	TEST_CASE_REASON("BPF prologue generation", bpf_prologue_test, "not compiled in or missing libtraceevent support"),
>   #endif
>   	{ .name = NULL, }
>   };
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