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selftests/bpf: add pre bpf_prog_test_run_opts() callback for test_loader 

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@gmail.com>
Link: https://lore.kernel.org/r/20230420232317.2181776-4-eddyz87@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Eduard Zingerman 2023-04-21 02:23:16 +03:00 committed by Alexei Starovoitov
parent 7cdddb99e4
commit 5b22f4d143
2 changed files with 17 additions and 0 deletions
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8
tools/testing/selftests/bpf/test_loader.c
View File

@ -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);

9
tools/testing/selftests/bpf/test_progs.h
View File

@ -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,