[PATCH V2] tools/perf/tests: Skip perf BPF test if clang is not present

[Athira Rajeev <atrajeev@linux.vnet.ibm.com>]

Perf BPF filter test fails in environment where "clang"
is not installed.

Test failure logs:

<<>>
 42: BPF filter                    :
 42.1: Basic BPF filtering         : Skip
 42.2: BPF pinning                 : FAILED!
 42.3: BPF prologue generation     : FAILED!
<<>>

Enabling verbose option provided debug logs which says
clang/llvm needs to be installed. Snippet of verbose logs:

<<>>
 42.2: BPF pinning                  :
 --- start ---
test child forked, pid 61423
ERROR:	unable to find clang.
Hint:	Try to install latest clang/llvm to support BPF.
        Check your $PATH

<<logs_here>>

Failed to compile test case: 'Basic BPF llvm compile'
Unable to get BPF object, fix kbuild first
test child finished with -1
 ---- end ----
BPF filter subtest 2: FAILED!
<<>>

Here subtests, "BPF pinning" and "BPF prologue generation"
failed and logs shows clang/llvm is needed. After installing
clang, testcase passes.

Reason on why subtest failure happens though logs has proper
debug information:
Main function __test__bpf calls test_llvm__fetch_bpf_obj by
passing 4th argument as true ( 4th arguments maps to parameter
"force" in test_llvm__fetch_bpf_obj ). But this will cause
test_llvm__fetch_bpf_obj to skip the check for clang/llvm.

Snippet of code part which checks for clang based on
parameter "force" in test_llvm__fetch_bpf_obj:

<<>>
if (!force && (!llvm_param.user_set_param &&
<<>>

Since force is set to "false", test won't get skipped and
fails to compile test case. The BPF code compilation needs
clang, So pass the fourth argument as "false" and also skip
the test if reason for return is "TEST_SKIP"

After the patch:

<<>>
 42: BPF filter                    :
 42.1: Basic BPF filtering         : Skip
 42.2: BPF pinning                 : Skip
 42.3: BPF prologue generation     : Skip
<<>>

Fixes: ba1fae431e74 ("perf test: Add 'perf test BPF'")
Signed-off-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
---
Changelog:
 Addressed review comments from Arnaldo by adding
 reason for skipping of testcase.

 tools/perf/tests/bpf.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/tools/perf/tests/bpf.c b/tools/perf/tests/bpf.c
index 57b9591f7cbb..17c023823713 100644
--- a/tools/perf/tests/bpf.c
+++ b/tools/perf/tests/bpf.c
@@ -222,11 +222,11 @@ static int __test__bpf(int idx)
 
 	ret = test_llvm__fetch_bpf_obj(&obj_buf, &obj_buf_sz,
 				       bpf_testcase_table[idx].prog_id,
-				       true, NULL);
+				       false, NULL);
 	if (ret != TEST_OK || !obj_buf || !obj_buf_sz) {
 		pr_debug("Unable to get BPF object, %s\n",
 			 bpf_testcase_table[idx].msg_compile_fail);
-		if (idx == 0)
+		if ((idx == 0) || (ret == TEST_SKIP))
 			return TEST_SKIP;
 		else
 			return TEST_FAIL;
@@ -364,9 +364,11 @@ static int test__bpf_prologue_test(struct test_suite *test __maybe_unused,
 static struct test_case bpf_tests[] = {
 #ifdef HAVE_LIBBPF_SUPPORT
 	TEST_CASE("Basic BPF filtering", basic_bpf_test),
-	TEST_CASE("BPF pinning", bpf_pinning),
+	TEST_CASE_REASON("BPF pinning", bpf_pinning,
+			"clang isn't installed or environment missing BPF support"),
 #ifdef HAVE_BPF_PROLOGUE
-	TEST_CASE("BPF prologue generation", bpf_prologue_test),
+	TEST_CASE_REASON("BPF prologue generation", bpf_prologue_test,
+			"clang isn't installed or environment missing BPF support"),
 #else
 	TEST_CASE_REASON("BPF prologue generation", bpf_prologue_test, "not compiled in"),
 #endif
-- 
2.31.1