mirror of https://gitee.com/openkylin/linux.git
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>
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@ -70,7 +70,7 @@ static struct {
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.tcp.urg_ptr = 123,
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};
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#define CHECK(condition, tag, format...) ({ \
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#define _CHECK(condition, tag, duration, format...) ({ \
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int __ret = !!(condition); \
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if (__ret) { \
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error_cnt++; \
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@ -83,6 +83,11 @@ static struct {
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__ret; \
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})
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#define CHECK(condition, tag, format...) \
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_CHECK(condition, tag, duration, format)
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#define CHECK_ATTR(condition, tag, format...) \
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_CHECK(condition, tag, tattr.duration, format)
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static int bpf_find_map(const char *test, struct bpf_object *obj,
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const char *name)
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{
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@ -124,6 +129,53 @@ static void test_pkt_access(void)
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bpf_object__close(obj);
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}
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static void test_prog_run_xattr(void)
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{
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const char *file = "./test_pkt_access.o";
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struct bpf_object *obj;
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char buf[10];
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int err;
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struct bpf_prog_test_run_attr tattr = {
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.repeat = 1,
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.data_in = &pkt_v4,
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.data_size_in = sizeof(pkt_v4),
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.data_out = buf,
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.data_size_out = 5,
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};
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err = bpf_prog_load(file, BPF_PROG_TYPE_SCHED_CLS, &obj,
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&tattr.prog_fd);
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if (CHECK_ATTR(err, "load", "err %d errno %d\n", err, errno))
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return;
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memset(buf, 0, sizeof(buf));
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err = bpf_prog_test_run_xattr(&tattr);
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CHECK_ATTR(err != -1 || errno != ENOSPC || tattr.retval, "run",
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"err %d errno %d retval %d\n", err, errno, tattr.retval);
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CHECK_ATTR(tattr.data_size_out != sizeof(pkt_v4), "data_size_out",
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"incorrect output size, want %lu have %u\n",
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sizeof(pkt_v4), tattr.data_size_out);
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CHECK_ATTR(buf[5] != 0, "overflow",
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"BPF_PROG_TEST_RUN ignored size hint\n");
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tattr.data_out = NULL;
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tattr.data_size_out = 0;
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errno = 0;
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err = bpf_prog_test_run_xattr(&tattr);
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CHECK_ATTR(err || errno || tattr.retval, "run_no_output",
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"err %d errno %d retval %d\n", err, errno, tattr.retval);
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tattr.data_size_out = 1;
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err = bpf_prog_test_run_xattr(&tattr);
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CHECK_ATTR(err != -EINVAL, "run_wrong_size_out", "err %d\n", err);
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bpf_object__close(obj);
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}
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static void test_xdp(void)
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{
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struct vip key4 = {.protocol = 6, .family = AF_INET};
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@ -1837,6 +1889,7 @@ int main(void)
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jit_enabled = is_jit_enabled();
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test_pkt_access();
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test_prog_run_xattr();
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test_xdp();
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test_xdp_adjust_tail();
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test_l4lb_all();
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