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selftests: bpf: Add a new test for bare tracepoints

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Reuse module_attach infrastructure to add a new bare tracepoint to check
we can attach to it as a raw tracepoint.

Signed-off-by: Qais Yousef <qais.yousef@arm.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20210119122237.2426878-3-qais.yousef@arm.com
This commit is contained in:
Qais Yousef
2021-01-19 12:22:37 +00:00
committed by Alexei Starovoitov
parent 6939f4ef16
commit 407be92206
5 changed files with 69 additions and 1 deletions
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27
tools/testing/selftests/bpf/prog_tests/module_attach.c
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@ -21,9 +21,34 @@ static int trigger_module_test_read(int read_sz)
return 0;
}
static int trigger_module_test_write(int write_sz)
{
int fd, err;
char *buf = malloc(write_sz);
if (!buf)
return -ENOMEM;
memset(buf, 'a', write_sz);
buf[write_sz-1] = '\0';
fd = open("/sys/kernel/bpf_testmod", O_WRONLY);
err = -errno;
if (CHECK(fd < 0, "testmod_file_open", "failed: %d\n", err)) {
free(buf);
return err;
}
write(fd, buf, write_sz);
close(fd);
free(buf);
return 0;
}
void test_module_attach(void)
{
const int READ_SZ = 456;
const int WRITE_SZ = 457;
struct test_module_attach* skel;
struct test_module_attach__bss *bss;
int err;
@ -48,8 +73,10 @@ void test_module_attach(void)
/* trigger tracepoint */
ASSERT_OK(trigger_module_test_read(READ_SZ), "trigger_read");
ASSERT_OK(trigger_module_test_write(WRITE_SZ), "trigger_write");
ASSERT_EQ(bss->raw_tp_read_sz, READ_SZ, "raw_tp");
ASSERT_EQ(bss->raw_tp_bare_write_sz, WRITE_SZ, "raw_tp_bare");
ASSERT_EQ(bss->tp_btf_read_sz, READ_SZ, "tp_btf");
ASSERT_EQ(bss->fentry_read_sz, READ_SZ, "fentry");
ASSERT_EQ(bss->fentry_manual_read_sz, READ_SZ, "fentry_manual");