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selftests/bpf: Add tracing multi session test

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Adding tests for tracing multi link session.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/r/20260606123955.345967-26-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Jiri Olsa 2026-06-06 14:39:50 +02:00 committed by Alexei Starovoitov
parent 1b938f42f5
commit 69f25d4b0c
3 changed files with 113 additions and 1 deletions
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4
tools/testing/selftests/bpf/Makefile
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@ -514,7 +514,8 @@ LINKED_SKELS := test_static_linked.skel.h linked_funcs.skel.h \
test_subskeleton.skel.h test_subskeleton_lib.skel.h \
test_usdt.skel.h tracing_multi.skel.h \
tracing_multi_module.skel.h \
tracing_multi_intersect.skel.h
tracing_multi_intersect.skel.h \
tracing_multi_session.skel.h
LSKELS := fexit_sleep.c trace_printk.c trace_vprintk.c map_ptr_kern.c \
core_kern.c core_kern_overflow.c test_ringbuf.c \
@ -543,6 +544,7 @@ xdp_features.skel.h-deps := xdp_features.bpf.o
tracing_multi.skel.h-deps := tracing_multi_attach.bpf.o tracing_multi_check.bpf.o
tracing_multi_module.skel.h-deps := tracing_multi_attach_module.bpf.o tracing_multi_check.bpf.o
tracing_multi_intersect.skel.h-deps := tracing_multi_intersect_attach.bpf.o tracing_multi_check.bpf.o
tracing_multi_session.skel.h-deps := tracing_multi_session_attach.bpf.o tracing_multi_check.bpf.o
LINKED_BPF_OBJS := $(foreach skel,$(LINKED_SKELS),$($(skel)-deps))
LINKED_BPF_SRCS := $(patsubst %.bpf.o,%.c,$(LINKED_BPF_OBJS))

45
tools/testing/selftests/bpf/prog_tests/tracing_multi.c
View File

@ -7,6 +7,7 @@
#include "tracing_multi.skel.h"
#include "tracing_multi_module.skel.h"
#include "tracing_multi_intersect.skel.h"
#include "tracing_multi_session.skel.h"
#include "trace_helpers.h"
static __u64 bpf_fentry_test_cookies[] = {
@ -455,6 +456,48 @@ static void test_intersect(void)
tracing_multi_intersect__destroy(skel);
}
static void test_session(void)
{
LIBBPF_OPTS(bpf_test_run_opts, topts);
struct tracing_multi_session *skel;
int err, prog_fd;
skel = tracing_multi_session__open_and_load();
if (!ASSERT_OK_PTR(skel, "tracing_multi_session__open_and_load"))
return;
skel->bss->pid = getpid();
err = tracing_multi_session__attach(skel);
if (!ASSERT_OK(err, "tracing_multi_session__attach"))
goto cleanup;
/* execute kernel session */
prog_fd = bpf_program__fd(skel->progs.test_session_1);
err = bpf_prog_test_run_opts(prog_fd, &topts);
ASSERT_OK(err, "test_run");
/* 10 for test_session_1, 1 for test_fsession_s */
ASSERT_EQ(skel->bss->test_result_fentry, 11, "test_result_fentry");
/* extra count (+1 for each fexit execution) for test_result_fexit cookie check/inc */
ASSERT_EQ(skel->bss->test_result_fexit, 22, "test_result_fexit");
skel->bss->test_result_fentry = 0;
skel->bss->test_result_fexit = 0;
/* execute bpf_testmo.ko session */
ASSERT_OK(trigger_module_test_read(1), "trigger_read");
/* 5 for test_session_2 */
ASSERT_EQ(skel->bss->test_result_fentry, 5, "test_result_fentry");
/* extra count (+1 for each fexit execution) for test_result_fexit cookie */
ASSERT_EQ(skel->bss->test_result_fexit, 10, "test_result_fexit");
cleanup:
tracing_multi_session__destroy(skel);
}
void test_tracing_multi_test(void)
{
#ifndef __x86_64__
@ -478,4 +521,6 @@ void test_tracing_multi_test(void)
test_intersect();
if (test__start_subtest("cookies"))
test_link_api_ids(true);
if (test__start_subtest("session"))
test_session();
}

65
tools/testing/selftests/bpf/progs/tracing_multi_session_attach.c Normal file
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@ -0,0 +1,65 @@
// SPDX-License-Identifier: GPL-2.0
#include <vmlinux.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
char _license[] SEC("license") = "GPL";
__hidden extern int tracing_multi_arg_check(__u64 *ctx, __u64 *test_result, bool is_return);
__u64 test_result_fentry = 0;
__u64 test_result_fexit = 0;
SEC("fsession.multi/bpf_fentry_test*")
int BPF_PROG(test_session_1)
{
volatile __u64 *cookie = bpf_session_cookie(ctx);
if (bpf_session_is_return(ctx)) {
if (tracing_multi_arg_check(ctx, &test_result_fexit, true))
return 0;
/* extra count for test_result_fexit cookie */
test_result_fexit += *cookie == 0xbeafbeafbeafbeaf;
} else {
if (tracing_multi_arg_check(ctx, &test_result_fentry, false))
return 0;
*cookie = 0xbeafbeafbeafbeaf;
}
return 0;
}
SEC("fsession.multi.s/bpf_fentry_test1")
int BPF_PROG(test_fsession_s)
{
volatile __u64 *cookie = bpf_session_cookie(ctx);
if (bpf_session_is_return(ctx)) {
if (tracing_multi_arg_check(ctx, &test_result_fexit, true))
return 0;
/* extra count for test_result_fexit cookie */
test_result_fexit += *cookie == 0xbeafbeafbeafbeaf;
} else {
if (tracing_multi_arg_check(ctx, &test_result_fentry, false))
return 0;
*cookie = 0xbeafbeafbeafbeaf;
}
return 0;
}
SEC("fsession.multi/bpf_testmod:bpf_testmod_fentry_test*")
int BPF_PROG(test_session_2)
{
volatile __u64 *cookie = bpf_session_cookie(ctx);
if (bpf_session_is_return(ctx)) {
if (tracing_multi_arg_check(ctx, &test_result_fexit, true))
return 0;
/* extra count for test_result_fexit cookie */
test_result_fexit += *cookie == 0xbeafbeafbeafbeaf;
} else {
if (tracing_multi_arg_check(ctx, &test_result_fentry, false))
return 0;
*cookie = 0xbeafbeafbeafbeaf;
}
return 0;
}