Commit f7afef56 authored by Menglong Dong's avatar Menglong Dong Committed by Alexei Starovoitov
Browse files

selftests/bpf: add testcases for fsession 



Add testcases for BPF_TRACE_FSESSION. The function arguments and return
value are tested both in the entry and exit. And the kfunc
bpf_session_is_ret() is also tested.

Signed-off-by: default avatarMenglong Dong <dongml2@chinatelecom.cn>
Link: https://lore.kernel.org/r/20260124062008.8657-11-dongml2@chinatelecom.cn


Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent 85fc4be6

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

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+90 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/* Copyright (c) 2025 ChinaTelecom */

#include <test_progs.h>

#include "fsession_test.skel.h"



static int check_result(struct fsession_test *skel)

{

	LIBBPF_OPTS(bpf_test_run_opts, topts);

	int err, prog_fd;



	/* Trigger test function calls */

	prog_fd = bpf_program__fd(skel->progs.test1);

	err = bpf_prog_test_run_opts(prog_fd, &topts);

	if (!ASSERT_OK(err, "test_run_opts err"))

		return err;

	if (!ASSERT_OK(topts.retval, "test_run_opts retval"))

		return topts.retval;



	for (int i = 0; i < sizeof(*skel->bss) / sizeof(__u64); i++) {

		if (!ASSERT_EQ(((__u64 *)skel->bss)[i], 1, "test_result"))

			return -EINVAL;

	}



	return 0;

}



static void test_fsession_basic(void)

{

	struct fsession_test *skel = NULL;

	int err;



	skel = fsession_test__open_and_load();

	if (!ASSERT_OK_PTR(skel, "fsession_test__open_and_load"))

		goto cleanup;



	err = fsession_test__attach(skel);

	if (!ASSERT_OK(err, "fsession_attach"))

		goto cleanup;



	check_result(skel);

cleanup:

	fsession_test__destroy(skel);

}



static void test_fsession_reattach(void)

{

	struct fsession_test *skel = NULL;

	int err;



	skel = fsession_test__open_and_load();

	if (!ASSERT_OK_PTR(skel, "fsession_test__open_and_load"))

		goto cleanup;



	/* first attach */

	err = fsession_test__attach(skel);

	if (!ASSERT_OK(err, "fsession_first_attach"))

		goto cleanup;



	if (check_result(skel))

		goto cleanup;



	/* detach */

	fsession_test__detach(skel);



	/* reset counters */

	memset(skel->bss, 0, sizeof(*skel->bss));



	/* second attach */

	err = fsession_test__attach(skel);

	if (!ASSERT_OK(err, "fsession_second_attach"))

		goto cleanup;



	if (check_result(skel))

		goto cleanup;



cleanup:

	fsession_test__destroy(skel);

}



void test_fsession_test(void)

{

#if !defined(__x86_64__)

	test__skip();

	return;

#endif

	if (test__start_subtest("fsession_test"))

		test_fsession_basic();

	if (test__start_subtest("fsession_reattach"))

		test_fsession_reattach();

}

tools/testing/selftests/bpf/progs/fsession_test.c

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+97 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/* Copyright (c) 2025 ChinaTelecom */

#include <vmlinux.h>

#include <bpf/bpf_helpers.h>

#include <bpf/bpf_tracing.h>



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



__u64 test1_entry_result = 0;

__u64 test1_exit_result = 0;



SEC("fsession/bpf_fentry_test1")

int BPF_PROG(test1, int a, int ret)

{

	bool is_exit = bpf_session_is_return(ctx);



	if (!is_exit) {

		test1_entry_result = a == 1 && ret == 0;

		return 0;

	}



	test1_exit_result = a == 1 && ret == 2;

	return 0;

}



__u64 test2_entry_result = 0;

__u64 test2_exit_result = 0;



SEC("fsession/bpf_fentry_test3")

int BPF_PROG(test2, char a, int b, __u64 c, int ret)

{

	bool is_exit = bpf_session_is_return(ctx);



	if (!is_exit) {

		test2_entry_result = a == 4 && b == 5 && c == 6 && ret == 0;

		return 0;

	}



	test2_exit_result = a == 4 && b == 5 && c == 6 && ret == 15;

	return 0;

}



__u64 test3_entry_result = 0;

__u64 test3_exit_result = 0;



SEC("fsession/bpf_fentry_test4")

int BPF_PROG(test3, void *a, char b, int c, __u64 d, int ret)

{

	bool is_exit = bpf_session_is_return(ctx);



	if (!is_exit) {

		test3_entry_result = a == (void *)7 && b == 8 && c == 9 && d == 10 && ret == 0;

		return 0;

	}



	test3_exit_result = a == (void *)7 && b == 8 && c == 9 && d == 10 && ret == 34;

	return 0;

}



__u64 test4_entry_result = 0;

__u64 test4_exit_result = 0;



SEC("fsession/bpf_fentry_test5")

int BPF_PROG(test4, __u64 a, void *b, short c, int d, __u64 e, int ret)

{

	bool is_exit = bpf_session_is_return(ctx);



	if (!is_exit) {

		test4_entry_result = a == 11 && b == (void *)12 && c == 13 && d == 14 &&

			e == 15 && ret == 0;

		return 0;

	}



	test4_exit_result = a == 11 && b == (void *)12 && c == 13 && d == 14 &&

		e == 15 && ret == 65;

	return 0;

}



__u64 test5_entry_result = 0;

__u64 test5_exit_result = 0;



SEC("fsession/bpf_fentry_test7")

int BPF_PROG(test5, struct bpf_fentry_test_t *arg, int ret)

{

	bool is_exit = bpf_session_is_return(ctx);



	if (!is_exit) {

		if (!arg)

			test5_entry_result = ret == 0;

		return 0;

	}



	if (!arg)

		test5_exit_result = 1;

	return 0;

}