bpf: Add selftest for BPF_ENABLE_STATS

// SPDX-License-Identifier: GPL-2.0

#include <test_progs.h>

#include "test_enable_stats.skel.h"

void test_enable_stats(void)

{

	struct test_enable_stats *skel;

	int stats_fd, err, prog_fd;

	struct bpf_prog_info info;

	__u32 info_len = sizeof(info);

	int duration = 0;

	skel = test_enable_stats__open_and_load();

	if (CHECK(!skel, "skel_open_and_load", "skeleton open/load failed\n"))

		return;

	stats_fd = bpf_enable_stats(BPF_STATS_RUN_TIME);

	if (CHECK(stats_fd < 0, "get_stats_fd", "failed %d\n", errno)) {

		test_enable_stats__destroy(skel);

		return;

	}

	err = test_enable_stats__attach(skel);

	if (CHECK(err, "attach_raw_tp", "err %d\n", err))

		goto cleanup;

	test_enable_stats__detach(skel);

	prog_fd = bpf_program__fd(skel->progs.test_enable_stats);

	memset(&info, 0, info_len);

	err = bpf_obj_get_info_by_fd(prog_fd, &info, &info_len);

	if (CHECK(err, "get_prog_info",

		  "failed to get bpf_prog_info for fd %d\n", prog_fd))

		goto cleanup;

	if (CHECK(info.run_time_ns == 0, "check_stats_enabled",

		  "failed to enable run_time_ns stats\n"))

		goto cleanup;

	CHECK(info.run_cnt != skel->bss->count, "check_run_cnt_valid",

	      "invalid run_cnt stats\n");

cleanup:

	test_enable_stats__destroy(skel);

	close(stats_fd);

}

// SPDX-License-Identifier: GPL-2.0

// Copyright (c) 2020 Facebook

#include <linux/bpf.h>

#include <stdint.h>

#include <linux/types.h>

#include <bpf/bpf_helpers.h>

char _license[] SEC("license") = "GPL";

__u64 count = 0;

SEC("raw_tracepoint/sys_enter")

int test_enable_stats(void *ctx)

{

	count += 1;

	return 0;

}