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selftests/bpf: convert existing tracepoint tests to new APIs 

Convert some existing tests that attach to tracepoints to use
bpf_program__attach_tracepoint API instead.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Reviewed-by: Stanislav Fomichev <sdf@google.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Andrii Nakryiko 2019-07-01 16:59:03 -07:00 committed by Daniel Borkmann
parent 1e8611bbdf
commit 1bdb34274a
3 changed files with 32 additions and 81 deletions
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55
tools/testing/selftests/bpf/prog_tests/stacktrace_build_id.c
View File

@ -4,11 +4,13 @@
void test_stacktrace_build_id(void)
{
int control_map_fd, stackid_hmap_fd, stackmap_fd, stack_amap_fd;
const char *prog_name = "tracepoint/random/urandom_read";
const char *file = "./test_stacktrace_build_id.o";
int bytes, efd, err, pmu_fd, prog_fd, stack_trace_len;
struct perf_event_attr attr = {};
int err, prog_fd, stack_trace_len;
__u32 key, previous_key, val, duration = 0;
struct bpf_program *prog;
struct bpf_object *obj;
struct bpf_link *link = NULL;
char buf[256];
int i, j;
struct bpf_stack_build_id id_offs[PERF_MAX_STACK_DEPTH];
@ -18,44 +20,16 @@ void test_stacktrace_build_id(void)
retry:
err = bpf_prog_load(file, BPF_PROG_TYPE_TRACEPOINT, &obj, &prog_fd);
if (CHECK(err, "prog_load", "err %d errno %d\n", err, errno))
goto out;
return;
/* Get the ID for the sched/sched_switch tracepoint */
snprintf(buf, sizeof(buf),
"/sys/kernel/debug/tracing/events/random/urandom_read/id");
efd = open(buf, O_RDONLY, 0);
if (CHECK(efd < 0, "open", "err %d errno %d\n", efd, errno))
prog = bpf_object__find_program_by_title(obj, prog_name);
if (CHECK(!prog, "find_prog", "prog '%s' not found\n", prog_name))
goto close_prog;
bytes = read(efd, buf, sizeof(buf));
close(efd);
if (CHECK(bytes <= 0 || bytes >= sizeof(buf),
"read", "bytes %d errno %d\n", bytes, errno))
link = bpf_program__attach_tracepoint(prog, "random", "urandom_read");
if (CHECK(IS_ERR(link), "attach_tp", "err %ld\n", PTR_ERR(link)))
goto close_prog;
/* Open the perf event and attach bpf progrram */
attr.config = strtol(buf, NULL, 0);
attr.type = PERF_TYPE_TRACEPOINT;
attr.sample_type = PERF_SAMPLE_RAW | PERF_SAMPLE_CALLCHAIN;
attr.sample_period = 1;
attr.wakeup_events = 1;
pmu_fd = syscall(__NR_perf_event_open, &attr, -1 /* pid */,
0 /* cpu 0 */, -1 /* group id */,
0 /* flags */);
if (CHECK(pmu_fd < 0, "perf_event_open", "err %d errno %d\n",
pmu_fd, errno))
goto close_prog;
err = ioctl(pmu_fd, PERF_EVENT_IOC_ENABLE, 0);
if (CHECK(err, "perf_event_ioc_enable", "err %d errno %d\n",
err, errno))
goto close_pmu;
err = ioctl(pmu_fd, PERF_EVENT_IOC_SET_BPF, prog_fd);
if (CHECK(err, "perf_event_ioc_set_bpf", "err %d errno %d\n",
err, errno))
goto disable_pmu;
/* find map fds */
control_map_fd = bpf_find_map(__func__, obj, "control_map");
if (CHECK(control_map_fd < 0, "bpf_find_map control_map",
@ -133,8 +107,7 @@ retry:
* try it one more time.
*/
if (build_id_matches < 1 && retry--) {
ioctl(pmu_fd, PERF_EVENT_IOC_DISABLE);
close(pmu_fd);
bpf_link__destroy(link);
bpf_object__close(obj);
printf("%s:WARN:Didn't find expected build ID from the map, retrying\n",
__func__);
@ -152,14 +125,8 @@ retry:
"err %d errno %d\n", err, errno);
disable_pmu:
ioctl(pmu_fd, PERF_EVENT_IOC_DISABLE);
close_pmu:
close(pmu_fd);
bpf_link__destroy(link);
close_prog:
bpf_object__close(obj);
out:
return;
}

43
tools/testing/selftests/bpf/prog_tests/stacktrace_map.c
View File

@ -4,50 +4,26 @@
void test_stacktrace_map(void)
{
int control_map_fd, stackid_hmap_fd, stackmap_fd, stack_amap_fd;
const char *prog_name = "tracepoint/sched/sched_switch";
int err, prog_fd, stack_trace_len;
const char *file = "./test_stacktrace_map.o";
int bytes, efd, err, pmu_fd, prog_fd, stack_trace_len;
struct perf_event_attr attr = {};
__u32 key, val, duration = 0;
struct bpf_program *prog;
struct bpf_object *obj;
char buf[256];
struct bpf_link *link;
err = bpf_prog_load(file, BPF_PROG_TYPE_TRACEPOINT, &obj, &prog_fd);
if (CHECK(err, "prog_load", "err %d errno %d\n", err, errno))
return;
/* Get the ID for the sched/sched_switch tracepoint */
snprintf(buf, sizeof(buf),
"/sys/kernel/debug/tracing/events/sched/sched_switch/id");
efd = open(buf, O_RDONLY, 0);
if (CHECK(efd < 0, "open", "err %d errno %d\n", efd, errno))
prog = bpf_object__find_program_by_title(obj, prog_name);
if (CHECK(!prog, "find_prog", "prog '%s' not found\n", prog_name))
goto close_prog;
bytes = read(efd, buf, sizeof(buf));
close(efd);
if (bytes <= 0 || bytes >= sizeof(buf))
link = bpf_program__attach_tracepoint(prog, "sched", "sched_switch");
if (CHECK(IS_ERR(link), "attach_tp", "err %ld\n", PTR_ERR(link)))
goto close_prog;
/* Open the perf event and attach bpf progrram */
attr.config = strtol(buf, NULL, 0);
attr.type = PERF_TYPE_TRACEPOINT;
attr.sample_type = PERF_SAMPLE_RAW | PERF_SAMPLE_CALLCHAIN;
attr.sample_period = 1;
attr.wakeup_events = 1;
pmu_fd = syscall(__NR_perf_event_open, &attr, -1 /* pid */,
0 /* cpu 0 */, -1 /* group id */,
0 /* flags */);
if (CHECK(pmu_fd < 0, "perf_event_open", "err %d errno %d\n",
pmu_fd, errno))
goto close_prog;
err = ioctl(pmu_fd, PERF_EVENT_IOC_ENABLE, 0);
if (err)
goto disable_pmu;
err = ioctl(pmu_fd, PERF_EVENT_IOC_SET_BPF, prog_fd);
if (err)
goto disable_pmu;
/* find map fds */
control_map_fd = bpf_find_map(__func__, obj, "control_map");
if (control_map_fd < 0)
@ -96,8 +72,7 @@ void test_stacktrace_map(void)
disable_pmu:
error_cnt++;
disable_pmu_noerr:
ioctl(pmu_fd, PERF_EVENT_IOC_DISABLE);
close(pmu_fd);
bpf_link__destroy(link);
close_prog:
bpf_object__close(obj);
}

15
tools/testing/selftests/bpf/prog_tests/stacktrace_map_raw_tp.c
View File

@ -3,18 +3,25 @@
void test_stacktrace_map_raw_tp(void)
{
const char *prog_name = "tracepoint/sched/sched_switch";
int control_map_fd, stackid_hmap_fd, stackmap_fd;
const char *file = "./test_stacktrace_map.o";
int efd, err, prog_fd;
__u32 key, val, duration = 0;
int err, prog_fd;
struct bpf_program *prog;
struct bpf_object *obj;
struct bpf_link *link = NULL;
err = bpf_prog_load(file, BPF_PROG_TYPE_RAW_TRACEPOINT, &obj, &prog_fd);
if (CHECK(err, "prog_load raw tp", "err %d errno %d\n", err, errno))
return;
efd = bpf_raw_tracepoint_open("sched_switch", prog_fd);
if (CHECK(efd < 0, "raw_tp_open", "err %d errno %d\n", efd, errno))
prog = bpf_object__find_program_by_title(obj, prog_name);
if (CHECK(!prog, "find_prog", "prog '%s' not found\n", prog_name))
goto close_prog;
link = bpf_program__attach_raw_tracepoint(prog, "sched_switch");
if (CHECK(IS_ERR(link), "attach_raw_tp", "err %ld\n", PTR_ERR(link)))
goto close_prog;
/* find map fds */
@ -55,5 +62,7 @@ void test_stacktrace_map_raw_tp(void)
close_prog:
error_cnt++;
close_prog_noerr:
if (!IS_ERR_OR_NULL(link))
bpf_link__destroy(link);
bpf_object__close(obj);
}