Commit 615741d8 authored by Stanislav Fomichev's avatar Stanislav Fomichev Committed by Alexei Starovoitov
Browse files

selftests: bpf: break up test_progs - stackmap 



Move stackmap prog tests into separate files.

Signed-off-by: default avatarStanislav Fomichev <sdf@google.com>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent eaf90740

tools/testing/selftests/bpf/prog_tests/stacktrace_build_id.c

0 → 100644
+165 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

#include <test_progs.h>



void test_stacktrace_build_id(void)

{

	int control_map_fd, stackid_hmap_fd, stackmap_fd, stack_amap_fd;

	const char *file = "./test_stacktrace_build_id.o";

	int bytes, efd, err, pmu_fd, prog_fd, stack_trace_len;

	struct perf_event_attr attr = {};

	__u32 key, previous_key, val, duration = 0;

	struct bpf_object *obj;

	char buf[256];

	int i, j;

	struct bpf_stack_build_id id_offs[PERF_MAX_STACK_DEPTH];

	int build_id_matches = 0;

	int retry = 1;



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;



	/* 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))

		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))

		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",

		  "err %d errno %d\n", err, errno))

		goto disable_pmu;



	stackid_hmap_fd = bpf_find_map(__func__, obj, "stackid_hmap");

	if (CHECK(stackid_hmap_fd < 0, "bpf_find_map stackid_hmap",

		  "err %d errno %d\n", err, errno))

		goto disable_pmu;



	stackmap_fd = bpf_find_map(__func__, obj, "stackmap");

	if (CHECK(stackmap_fd < 0, "bpf_find_map stackmap", "err %d errno %d\n",

		  err, errno))

		goto disable_pmu;



	stack_amap_fd = bpf_find_map(__func__, obj, "stack_amap");

	if (CHECK(stack_amap_fd < 0, "bpf_find_map stack_amap",

		  "err %d errno %d\n", err, errno))

		goto disable_pmu;



	assert(system("dd if=/dev/urandom of=/dev/zero count=4 2> /dev/null")

	       == 0);

	assert(system("./urandom_read") == 0);

	/* disable stack trace collection */

	key = 0;

	val = 1;

	bpf_map_update_elem(control_map_fd, &key, &val, 0);



	/* for every element in stackid_hmap, we can find a corresponding one

	 * in stackmap, and vise versa.

	 */

	err = compare_map_keys(stackid_hmap_fd, stackmap_fd);

	if (CHECK(err, "compare_map_keys stackid_hmap vs. stackmap",

		  "err %d errno %d\n", err, errno))

		goto disable_pmu;



	err = compare_map_keys(stackmap_fd, stackid_hmap_fd);

	if (CHECK(err, "compare_map_keys stackmap vs. stackid_hmap",

		  "err %d errno %d\n", err, errno))

		goto disable_pmu;



	err = extract_build_id(buf, 256);



	if (CHECK(err, "get build_id with readelf",

		  "err %d errno %d\n", err, errno))

		goto disable_pmu;



	err = bpf_map_get_next_key(stackmap_fd, NULL, &key);

	if (CHECK(err, "get_next_key from stackmap",

		  "err %d, errno %d\n", err, errno))

		goto disable_pmu;



	do {

		char build_id[64];



		err = bpf_map_lookup_elem(stackmap_fd, &key, id_offs);

		if (CHECK(err, "lookup_elem from stackmap",

			  "err %d, errno %d\n", err, errno))

			goto disable_pmu;

		for (i = 0; i < PERF_MAX_STACK_DEPTH; ++i)

			if (id_offs[i].status == BPF_STACK_BUILD_ID_VALID &&

			    id_offs[i].offset != 0) {

				for (j = 0; j < 20; ++j)

					sprintf(build_id + 2 * j, "%02x",

						id_offs[i].build_id[j] & 0xff);

				if (strstr(buf, build_id) != NULL)

					build_id_matches = 1;

			}

		previous_key = key;

	} while (bpf_map_get_next_key(stackmap_fd, &previous_key, &key) == 0);



	/* stack_map_get_build_id_offset() is racy and sometimes can return

	 * BPF_STACK_BUILD_ID_IP instead of BPF_STACK_BUILD_ID_VALID;

	 * try it one more time.

	 */

	if (build_id_matches < 1 && retry--) {

		ioctl(pmu_fd, PERF_EVENT_IOC_DISABLE);

		close(pmu_fd);

		bpf_object__close(obj);

		printf("%s:WARN:Didn't find expected build ID from the map, retrying\n",

		       __func__);

		goto retry;

	}



	if (CHECK(build_id_matches < 1, "build id match",

		  "Didn't find expected build ID from the map\n"))

		goto disable_pmu;



	stack_trace_len = PERF_MAX_STACK_DEPTH

		* sizeof(struct bpf_stack_build_id);

	err = compare_stack_ips(stackmap_fd, stack_amap_fd, stack_trace_len);

	CHECK(err, "compare_stack_ips stackmap vs. stack_amap",

	      "err %d errno %d\n", err, errno);



disable_pmu:

	ioctl(pmu_fd, PERF_EVENT_IOC_DISABLE);



close_pmu:

	close(pmu_fd);



close_prog:

	bpf_object__close(obj);



out:

	return;

}

tools/testing/selftests/bpf/prog_tests/stacktrace_build_id_nmi.c

0 → 100644
+150 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

#include <test_progs.h>



void test_stacktrace_build_id_nmi(void)

{

	int control_map_fd, stackid_hmap_fd, stackmap_fd, stack_amap_fd;

	const char *file = "./test_stacktrace_build_id.o";

	int err, pmu_fd, prog_fd;

	struct perf_event_attr attr = {

		.sample_freq = 5000,

		.freq = 1,

		.type = PERF_TYPE_HARDWARE,

		.config = PERF_COUNT_HW_CPU_CYCLES,

	};

	__u32 key, previous_key, val, duration = 0;

	struct bpf_object *obj;

	char buf[256];

	int i, j;

	struct bpf_stack_build_id id_offs[PERF_MAX_STACK_DEPTH];

	int build_id_matches = 0;

	int retry = 1;



retry:

	err = bpf_prog_load(file, BPF_PROG_TYPE_PERF_EVENT, &obj, &prog_fd);

	if (CHECK(err, "prog_load", "err %d errno %d\n", err, errno))

		return;



	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. Does the test host support PERF_COUNT_HW_CPU_CYCLES?\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",

		  "err %d errno %d\n", err, errno))

		goto disable_pmu;



	stackid_hmap_fd = bpf_find_map(__func__, obj, "stackid_hmap");

	if (CHECK(stackid_hmap_fd < 0, "bpf_find_map stackid_hmap",

		  "err %d errno %d\n", err, errno))

		goto disable_pmu;



	stackmap_fd = bpf_find_map(__func__, obj, "stackmap");

	if (CHECK(stackmap_fd < 0, "bpf_find_map stackmap", "err %d errno %d\n",

		  err, errno))

		goto disable_pmu;



	stack_amap_fd = bpf_find_map(__func__, obj, "stack_amap");

	if (CHECK(stack_amap_fd < 0, "bpf_find_map stack_amap",

		  "err %d errno %d\n", err, errno))

		goto disable_pmu;



	assert(system("dd if=/dev/urandom of=/dev/zero count=4 2> /dev/null")

	       == 0);

	assert(system("taskset 0x1 ./urandom_read 100000") == 0);

	/* disable stack trace collection */

	key = 0;

	val = 1;

	bpf_map_update_elem(control_map_fd, &key, &val, 0);



	/* for every element in stackid_hmap, we can find a corresponding one

	 * in stackmap, and vise versa.

	 */

	err = compare_map_keys(stackid_hmap_fd, stackmap_fd);

	if (CHECK(err, "compare_map_keys stackid_hmap vs. stackmap",

		  "err %d errno %d\n", err, errno))

		goto disable_pmu;



	err = compare_map_keys(stackmap_fd, stackid_hmap_fd);

	if (CHECK(err, "compare_map_keys stackmap vs. stackid_hmap",

		  "err %d errno %d\n", err, errno))

		goto disable_pmu;



	err = extract_build_id(buf, 256);



	if (CHECK(err, "get build_id with readelf",

		  "err %d errno %d\n", err, errno))

		goto disable_pmu;



	err = bpf_map_get_next_key(stackmap_fd, NULL, &key);

	if (CHECK(err, "get_next_key from stackmap",

		  "err %d, errno %d\n", err, errno))

		goto disable_pmu;



	do {

		char build_id[64];



		err = bpf_map_lookup_elem(stackmap_fd, &key, id_offs);

		if (CHECK(err, "lookup_elem from stackmap",

			  "err %d, errno %d\n", err, errno))

			goto disable_pmu;

		for (i = 0; i < PERF_MAX_STACK_DEPTH; ++i)

			if (id_offs[i].status == BPF_STACK_BUILD_ID_VALID &&

			    id_offs[i].offset != 0) {

				for (j = 0; j < 20; ++j)

					sprintf(build_id + 2 * j, "%02x",

						id_offs[i].build_id[j] & 0xff);

				if (strstr(buf, build_id) != NULL)

					build_id_matches = 1;

			}

		previous_key = key;

	} while (bpf_map_get_next_key(stackmap_fd, &previous_key, &key) == 0);



	/* stack_map_get_build_id_offset() is racy and sometimes can return

	 * BPF_STACK_BUILD_ID_IP instead of BPF_STACK_BUILD_ID_VALID;

	 * try it one more time.

	 */

	if (build_id_matches < 1 && retry--) {

		ioctl(pmu_fd, PERF_EVENT_IOC_DISABLE);

		close(pmu_fd);

		bpf_object__close(obj);

		printf("%s:WARN:Didn't find expected build ID from the map, retrying\n",

		       __func__);

		goto retry;

	}



	if (CHECK(build_id_matches < 1, "build id match",

		  "Didn't find expected build ID from the map\n"))

		goto disable_pmu;



	/*

	 * We intentionally skip compare_stack_ips(). This is because we

	 * only support one in_nmi() ips-to-build_id translation per cpu

	 * at any time, thus stack_amap here will always fallback to

	 * BPF_STACK_BUILD_ID_IP;

	 */



disable_pmu:

	ioctl(pmu_fd, PERF_EVENT_IOC_DISABLE);



close_pmu:

	close(pmu_fd);



close_prog:

	bpf_object__close(obj);

}

tools/testing/selftests/bpf/prog_tests/stacktrace_map.c

0 → 100644
+103 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

#include <test_progs.h>



void test_stacktrace_map(void)

{

	int control_map_fd, stackid_hmap_fd, stackmap_fd, stack_amap_fd;

	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_object *obj;

	char buf[256];



	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))

		goto close_prog;



	bytes = read(efd, buf, sizeof(buf));

	close(efd);

	if (bytes <= 0 || bytes >= sizeof(buf))

		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)

		goto disable_pmu;



	stackid_hmap_fd = bpf_find_map(__func__, obj, "stackid_hmap");

	if (stackid_hmap_fd < 0)

		goto disable_pmu;



	stackmap_fd = bpf_find_map(__func__, obj, "stackmap");

	if (stackmap_fd < 0)

		goto disable_pmu;



	stack_amap_fd = bpf_find_map(__func__, obj, "stack_amap");

	if (stack_amap_fd < 0)

		goto disable_pmu;



	/* give some time for bpf program run */

	sleep(1);



	/* disable stack trace collection */

	key = 0;

	val = 1;

	bpf_map_update_elem(control_map_fd, &key, &val, 0);



	/* for every element in stackid_hmap, we can find a corresponding one

	 * in stackmap, and vise versa.

	 */

	err = compare_map_keys(stackid_hmap_fd, stackmap_fd);

	if (CHECK(err, "compare_map_keys stackid_hmap vs. stackmap",

		  "err %d errno %d\n", err, errno))

		goto disable_pmu_noerr;



	err = compare_map_keys(stackmap_fd, stackid_hmap_fd);

	if (CHECK(err, "compare_map_keys stackmap vs. stackid_hmap",

		  "err %d errno %d\n", err, errno))

		goto disable_pmu_noerr;



	stack_trace_len = PERF_MAX_STACK_DEPTH * sizeof(__u64);

	err = compare_stack_ips(stackmap_fd, stack_amap_fd, stack_trace_len);

	if (CHECK(err, "compare_stack_ips stackmap vs. stack_amap",

		  "err %d errno %d\n", err, errno))

		goto disable_pmu_noerr;



	goto disable_pmu_noerr;

disable_pmu:

	error_cnt++;

disable_pmu_noerr:

	ioctl(pmu_fd, PERF_EVENT_IOC_DISABLE);

	close(pmu_fd);

close_prog:

	bpf_object__close(obj);

}

tools/testing/selftests/bpf/prog_tests/stacktrace_map_raw_tp.c

0 → 100644
+59 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

#include <test_progs.h>



void test_stacktrace_map_raw_tp(void)

{

	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;

	struct bpf_object *obj;



	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))

		goto close_prog;



	/* find map fds */

	control_map_fd = bpf_find_map(__func__, obj, "control_map");

	if (control_map_fd < 0)

		goto close_prog;



	stackid_hmap_fd = bpf_find_map(__func__, obj, "stackid_hmap");

	if (stackid_hmap_fd < 0)

		goto close_prog;



	stackmap_fd = bpf_find_map(__func__, obj, "stackmap");

	if (stackmap_fd < 0)

		goto close_prog;



	/* give some time for bpf program run */

	sleep(1);



	/* disable stack trace collection */

	key = 0;

	val = 1;

	bpf_map_update_elem(control_map_fd, &key, &val, 0);



	/* for every element in stackid_hmap, we can find a corresponding one

	 * in stackmap, and vise versa.

	 */

	err = compare_map_keys(stackid_hmap_fd, stackmap_fd);

	if (CHECK(err, "compare_map_keys stackid_hmap vs. stackmap",

		  "err %d errno %d\n", err, errno))

		goto close_prog;



	err = compare_map_keys(stackmap_fd, stackid_hmap_fd);

	if (CHECK(err, "compare_map_keys stackmap vs. stackid_hmap",

		  "err %d errno %d\n", err, errno))

		goto close_prog;



	goto close_prog_noerr;

close_prog:

	error_cnt++;

close_prog_noerr:

	bpf_object__close(obj);

}

tools/testing/selftests/bpf/test_progs.c

+3 −476

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