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selftests: add a test for bpf_prog_test_run_xattr 

Make sure that bpf_prog_test_run_xattr returns the correct length
and that the kernel respects the output size hint. Also check
that errno indicates ENOSPC if there is a short output buffer given.

Signed-off-by: Lorenz Bauer <lmb@cloudflare.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Lorenz Bauer 2018-12-03 11:31:26 +00:00 committed by Alexei Starovoitov
parent 64a975913b
commit df47fc376d
1 changed files with 54 additions and 1 deletions
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55
tools/testing/selftests/bpf/test_progs.c
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@ -70,7 +70,7 @@ static struct {
.tcp.urg_ptr = 123, .tcp.urg_ptr = 123,
}; };
#define CHECK(condition, tag, format...) ({ \ #define _CHECK(condition, tag, duration, format...) ({ \
int __ret = !!(condition); \ int __ret = !!(condition); \
if (__ret) { \ if (__ret) { \
error_cnt++; \ error_cnt++; \
@ -83,6 +83,11 @@ static struct {
__ret; \ __ret; \
}) })
#define CHECK(condition, tag, format...) \
_CHECK(condition, tag, duration, format)
#define CHECK_ATTR(condition, tag, format...) \
_CHECK(condition, tag, tattr.duration, format)
static int bpf_find_map(const char *test, struct bpf_object *obj, static int bpf_find_map(const char *test, struct bpf_object *obj,
const char *name) const char *name)
{ {
@ -124,6 +129,53 @@ static void test_pkt_access(void)
bpf_object__close(obj); bpf_object__close(obj);
} }
static void test_prog_run_xattr(void)
{
const char *file = "./test_pkt_access.o";
struct bpf_object *obj;
char buf[10];
int err;
struct bpf_prog_test_run_attr tattr = {
.repeat = 1,
.data_in = &pkt_v4,
.data_size_in = sizeof(pkt_v4),
.data_out = buf,
.data_size_out = 5,
};
err = bpf_prog_load(file, BPF_PROG_TYPE_SCHED_CLS, &obj,
&tattr.prog_fd);
if (CHECK_ATTR(err, "load", "err %d errno %d\n", err, errno))
return;
memset(buf, 0, sizeof(buf));
err = bpf_prog_test_run_xattr(&tattr);
CHECK_ATTR(err != -1 || errno != ENOSPC || tattr.retval, "run",
"err %d errno %d retval %d\n", err, errno, tattr.retval);
CHECK_ATTR(tattr.data_size_out != sizeof(pkt_v4), "data_size_out",
"incorrect output size, want %lu have %u\n",
sizeof(pkt_v4), tattr.data_size_out);
CHECK_ATTR(buf[5] != 0, "overflow",
"BPF_PROG_TEST_RUN ignored size hint\n");
tattr.data_out = NULL;
tattr.data_size_out = 0;
errno = 0;
err = bpf_prog_test_run_xattr(&tattr);
CHECK_ATTR(err || errno || tattr.retval, "run_no_output",
"err %d errno %d retval %d\n", err, errno, tattr.retval);
tattr.data_size_out = 1;
err = bpf_prog_test_run_xattr(&tattr);
CHECK_ATTR(err != -EINVAL, "run_wrong_size_out", "err %d\n", err);
bpf_object__close(obj);
}
static void test_xdp(void) static void test_xdp(void)
{ {
struct vip key4 = {.protocol = 6, .family = AF_INET}; struct vip key4 = {.protocol = 6, .family = AF_INET};
@ -1837,6 +1889,7 @@ int main(void)
jit_enabled = is_jit_enabled(); jit_enabled = is_jit_enabled();
test_pkt_access(); test_pkt_access();
test_prog_run_xattr();
test_xdp(); test_xdp();
test_xdp_adjust_tail(); test_xdp_adjust_tail();
test_l4lb_all(); test_l4lb_all();