When a test case is annotated with __retval tag the test_loader engine
would use libbpf's bpf_prog_test_run_opts() to do a test run of the
program and compare retvals.
This commit allows to perform arbitrary actions on bpf object right
before test loader invokes bpf_prog_test_run_opts(). This could be
used to setup some state for program execution, e.g. fill some maps.
Signed-off-by: Eduard Zingerman <eddyz87@xxxxxxxxx>
---
tools/testing/selftests/bpf/test_loader.c | 8 ++++++++
tools/testing/selftests/bpf/test_progs.h | 9 +++++++++
2 files changed, 17 insertions(+)
diff --git a/tools/testing/selftests/bpf/test_loader.c b/tools/testing/selftests/bpf/test_loader.c
index e2a1bdc5a570..40c9b7d532c4 100644
--- a/tools/testing/selftests/bpf/test_loader.c
+++ b/tools/testing/selftests/bpf/test_loader.c
@@ -590,6 +590,14 @@ void run_subtest(struct test_loader *tester,
if (restore_capabilities(&caps))
goto tobj_cleanup;
+ if (tester->pre_execution_cb) {
+ err = tester->pre_execution_cb(tobj);
+ if (err) {
+ PRINT_FAIL("pre_execution_cb failed: %d\n", err);
+ goto tobj_cleanup;
+ }
+ }
+
do_prog_test_run(bpf_program__fd(tprog), &retval);
if (retval != subspec->retval && subspec->retval != POINTER_VALUE) {
PRINT_FAIL("Unexpected retval: %d != %d\n", retval, subspec->retval);
diff --git a/tools/testing/selftests/bpf/test_progs.h b/tools/testing/selftests/bpf/test_progs.h
index 10ba43250668..0ed3134333d4 100644
--- a/tools/testing/selftests/bpf/test_progs.h
+++ b/tools/testing/selftests/bpf/test_progs.h
@@ -424,14 +424,23 @@ int get_bpf_max_tramp_links(void);
#define BPF_TESTMOD_TEST_FILE "/sys/kernel/bpf_testmod"
+typedef int (*pre_execution_cb)(struct bpf_object *obj);
+
struct test_loader {
char *log_buf;
size_t log_buf_sz;
size_t next_match_pos;
+ pre_execution_cb pre_execution_cb;
struct bpf_object *obj;
};
+static inline void test_loader__set_pre_execution_cb(struct test_loader *tester,
+ pre_execution_cb cb)
+{
+ tester->pre_execution_cb = cb;
+}
+
typedef const void *(*skel_elf_bytes_fn)(size_t *sz);
extern void test_loader__run_subtests(struct test_loader *tester,
--
2.40.0
