diff options
author | Jiri Olsa <jolsa@kernel.org> | 2023-09-21 00:31:45 +0300 |
---|---|---|
committer | Andrii Nakryiko <andrii@kernel.org> | 2023-09-26 02:37:45 +0300 |
commit | 85981e0f9e9fc882578f0ad7488d6c59193dd187 (patch) | |
tree | c693b65caa5a8a700c04677fcce5e8db95a7a706 /tools | |
parent | 59e83c0187c5eed648c28aea637a5cf3e246921b (diff) | |
download | linux-85981e0f9e9fc882578f0ad7488d6c59193dd187.tar.xz |
selftests/bpf: Add test for recursion counts of perf event link tracepoint
Adding selftest that puts kprobe on bpf_fentry_test1 that calls bpf_printk
and invokes bpf_trace_printk tracepoint. The bpf_trace_printk tracepoint
has test[234] programs attached to it.
Because kprobe execution goes through bpf_prog_active check, programs
attached to the tracepoint will fail the recursion check and increment the
recursion_misses stats.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Tested-by: Song Liu <song@kernel.org>
Reviewed-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/bpf/20230920213145.1941596-10-jolsa@kernel.org
Diffstat (limited to 'tools')
-rw-r--r-- | tools/testing/selftests/bpf/prog_tests/missed.c | 40 | ||||
-rw-r--r-- | tools/testing/selftests/bpf/progs/missed_tp_recursion.c | 41 |
2 files changed, 81 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/prog_tests/missed.c b/tools/testing/selftests/bpf/prog_tests/missed.c index 54aaf2f8ad8c..24ade11f5c05 100644 --- a/tools/testing/selftests/bpf/prog_tests/missed.c +++ b/tools/testing/selftests/bpf/prog_tests/missed.c @@ -2,6 +2,7 @@ #include <test_progs.h> #include "missed_kprobe.skel.h" #include "missed_kprobe_recursion.skel.h" +#include "missed_tp_recursion.skel.h" /* * Putting kprobe on bpf_fentry_test1 that calls bpf_kfunc_common_test @@ -89,10 +90,49 @@ cleanup: missed_kprobe_recursion__destroy(skel); } +/* + * Putting kprobe on bpf_fentry_test1 that calls bpf_printk and invokes + * bpf_trace_printk tracepoint. The bpf_trace_printk tracepoint has test[234] + * programs attached to it. + * + * Because kprobe execution goes through bpf_prog_active check, programs + * attached to the tracepoint will fail the recursion check and increment + * the recursion_misses stats. + */ +static void test_missed_tp_recursion(void) +{ + LIBBPF_OPTS(bpf_test_run_opts, topts); + struct missed_tp_recursion *skel; + int err, prog_fd; + + skel = missed_tp_recursion__open_and_load(); + if (!ASSERT_OK_PTR(skel, "missed_tp_recursion__open_and_load")) + goto cleanup; + + err = missed_tp_recursion__attach(skel); + if (!ASSERT_OK(err, "missed_tp_recursion__attach")) + goto cleanup; + + prog_fd = bpf_program__fd(skel->progs.trigger); + err = bpf_prog_test_run_opts(prog_fd, &topts); + ASSERT_OK(err, "test_run"); + ASSERT_EQ(topts.retval, 0, "test_run"); + + ASSERT_EQ(get_missed_count(bpf_program__fd(skel->progs.test1)), 0, "test1_recursion_misses"); + ASSERT_EQ(get_missed_count(bpf_program__fd(skel->progs.test2)), 1, "test2_recursion_misses"); + ASSERT_EQ(get_missed_count(bpf_program__fd(skel->progs.test3)), 1, "test3_recursion_misses"); + ASSERT_EQ(get_missed_count(bpf_program__fd(skel->progs.test4)), 1, "test4_recursion_misses"); + +cleanup: + missed_tp_recursion__destroy(skel); +} + void test_missed(void) { if (test__start_subtest("perf_kprobe")) test_missed_perf_kprobe(); if (test__start_subtest("kprobe_recursion")) test_missed_kprobe_recursion(); + if (test__start_subtest("tp_recursion")) + test_missed_tp_recursion(); } diff --git a/tools/testing/selftests/bpf/progs/missed_tp_recursion.c b/tools/testing/selftests/bpf/progs/missed_tp_recursion.c new file mode 100644 index 000000000000..762385f827c5 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/missed_tp_recursion.c @@ -0,0 +1,41 @@ +// SPDX-License-Identifier: GPL-2.0 +#include "vmlinux.h" +#include <bpf/bpf_helpers.h> +#include <bpf/bpf_tracing.h> + +char _license[] SEC("license") = "GPL"; + +/* + * No tests in here, just to trigger 'bpf_fentry_test*' + * through tracing test_run + */ +SEC("fentry/bpf_modify_return_test") +int BPF_PROG(trigger) +{ + return 0; +} + +SEC("kprobe/bpf_fentry_test1") +int test1(struct pt_regs *ctx) +{ + bpf_printk("test"); + return 0; +} + +SEC("tp/bpf_trace/bpf_trace_printk") +int test2(struct pt_regs *ctx) +{ + return 0; +} + +SEC("tp/bpf_trace/bpf_trace_printk") +int test3(struct pt_regs *ctx) +{ + return 0; +} + +SEC("tp/bpf_trace/bpf_trace_printk") +int test4(struct pt_regs *ctx) +{ + return 0; +} |