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selftests/bpf: add test of __weak unknown virtual __kconfig extern

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Exercise libbpf's logic for unknown __weak virtual __kconfig externs.
USDT selftests are already excercising non-weak known virtual extern
already (LINUX_HAS_BPF_COOKIE), so no need to add explicit tests for it.

Tested-by: Alan Maguire <alan.maguire@oracle.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20220714070755.3235561-3-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Andrii Nakryiko 2022-07-14 00:07:52 -07:00 committed by Alexei Starovoitov
parent 55d00c37eb
commit ce6dc74a0a
2 changed files with 10 additions and 10 deletions
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17
tools/testing/selftests/bpf/prog_tests/core_extern.c
View File

@ -39,6 +39,7 @@ static struct test_case {
"CONFIG_STR=\"abracad\"\n"
"CONFIG_MISSING=0",
.data = {
.unkn_virt_val = 0,
.bpf_syscall = false,
.tristate_val = TRI_MODULE,
.bool_val = true,
@ -121,7 +122,7 @@ static struct test_case {
void test_core_extern(void)
{
const uint32_t kern_ver = get_kernel_version();
int err, duration = 0, i, j;
int err, i, j;
struct test_core_extern *skel = NULL;
uint64_t *got, *exp;
int n = sizeof(*skel->data) / sizeof(uint64_t);
@ -136,19 +137,17 @@ void test_core_extern(void)
continue;
skel = test_core_extern__open_opts(&opts);
if (CHECK(!skel, "skel_open", "skeleton open failed\n"))
if (!ASSERT_OK_PTR(skel, "skel_open"))
goto cleanup;
err = test_core_extern__load(skel);
if (t->fails) {
CHECK(!err, "skel_load",
"shouldn't succeed open/load of skeleton\n");
ASSERT_ERR(err, "skel_load_should_fail");
goto cleanup;
} else if (CHECK(err, "skel_load",
"failed to open/load skeleton\n")) {
} else if (!ASSERT_OK(err, "skel_load")) {
goto cleanup;
}
err = test_core_extern__attach(skel);
if (CHECK(err, "attach_raw_tp", "failed attach: %d\n", err))
if (!ASSERT_OK(err, "attach_raw_tp"))
goto cleanup;
usleep(1);
@ -158,9 +157,7 @@ void test_core_extern(void)
got = (uint64_t *)skel->data;
exp = (uint64_t *)&t->data;
for (j = 0; j < n; j++) {
CHECK(got[j] != exp[j], "check_res",
"result #%d: expected %llx, but got %llx\n",
j, (__u64)exp[j], (__u64)got[j]);
ASSERT_EQ(got[j], exp[j], "result");
}
cleanup:
test_core_extern__destroy(skel);

3
tools/testing/selftests/bpf/progs/test_core_extern.c
View File

@ -11,6 +11,7 @@
static int (*bpf_missing_helper)(const void *arg1, int arg2) = (void *) 999;
extern int LINUX_KERNEL_VERSION __kconfig;
extern int LINUX_UNKNOWN_VIRTUAL_EXTERN __kconfig __weak;
extern bool CONFIG_BPF_SYSCALL __kconfig; /* strong */
extern enum libbpf_tristate CONFIG_TRISTATE __kconfig __weak;
extern bool CONFIG_BOOL __kconfig __weak;
@ -22,6 +23,7 @@ extern const char CONFIG_STR[8] __kconfig __weak;
extern uint64_t CONFIG_MISSING __kconfig __weak;
uint64_t kern_ver = -1;
uint64_t unkn_virt_val = -1;
uint64_t bpf_syscall = -1;
uint64_t tristate_val = -1;
uint64_t bool_val = -1;
@ -38,6 +40,7 @@ int handle_sys_enter(struct pt_regs *ctx)
int i;
kern_ver = LINUX_KERNEL_VERSION;
unkn_virt_val = LINUX_UNKNOWN_VIRTUAL_EXTERN;
bpf_syscall = CONFIG_BPF_SYSCALL;
tristate_val = CONFIG_TRISTATE;
bool_val = CONFIG_BOOL;