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    Subject[PATCH 5.17 132/158] perf test bpf: Skip test if clang is not present
    Date
    From: Athira Rajeev <atrajeev@linux.vnet.ibm.com>

    [ Upstream commit 8994e97be3eb3c3a7b59d6223018ffab8c272e2d ]

    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: ba1fae431e74bb42 ("perf test: Add 'perf test BPF'")
    Reviewed-by: Kajol Jain <kjain@linux.ibm.com>
    Signed-off-by: Athira Jajeev <atrajeev@linux.vnet.ibm.com>
    Acked-by: Ian Rogers <irogers@google.com>
    Cc: Disha Goel <disgoel@linux.vnet.ibm.com>
    Cc: Jiri Olsa <jolsa@kernel.org>
    Cc: linuxppc-dev@lists.ozlabs.org
    Cc: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
    Cc: Michael Ellerman <mpe@ellerman.id.au>
    Cc: Nageswara R Sastry <rnsastry@linux.ibm.com>
    Cc: Wang Nan <wangnan0@huawei.com>
    Link: https://lore.kernel.org/r/20220511115438.84032-1-atrajeev@linux.vnet.ibm.com
    Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    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 573490530194..592ab02d5ba3 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;
    @@ -370,9 +370,11 @@ 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
    --
    2.35.1


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