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selftests/bpf: Test a BPF CC implementing the unsupported get_info()

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Test whether a TCP CC implemented in BPF providing get_info() is
rejected correctly. get_info() is unsupported in a BPF CC. The check for
required functions in a BPF CC has moved, this test ensures unsupported
functions are still rejected correctly.

Signed-off-by: Jörn-Thorben Hinz <jthinz@mailbox.tu-berlin.de>
Reviewed-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/r/20220622191227.898118-6-jthinz@mailbox.tu-berlin.de
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Jörn-Thorben Hinz 2022-06-22 21:12:27 +02:00 committed by Alexei Starovoitov
parent 0735627d78
commit f14a3f644a
2 changed files with 41 additions and 0 deletions
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20
tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c
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@ -11,6 +11,7 @@
#include "bpf_dctcp_release.skel.h"
#include "tcp_ca_write_sk_pacing.skel.h"
#include "tcp_ca_incompl_cong_ops.skel.h"
#include "tcp_ca_unsupp_cong_op.skel.h"
#ifndef ENOTSUPP
#define ENOTSUPP 524
@ -359,6 +360,23 @@ static void test_incompl_cong_ops(void)
tcp_ca_incompl_cong_ops__destroy(skel);
}
static void test_unsupp_cong_op(void)
{
libbpf_print_fn_t old_print_fn;
struct tcp_ca_unsupp_cong_op *skel;
err_str = "attach to unsupported member get_info";
found = false;
old_print_fn = libbpf_set_print(libbpf_debug_print);
skel = tcp_ca_unsupp_cong_op__open_and_load();
ASSERT_NULL(skel, "open_and_load");
ASSERT_EQ(found, true, "expected_err_msg");
tcp_ca_unsupp_cong_op__destroy(skel);
libbpf_set_print(old_print_fn);
}
void test_bpf_tcp_ca(void)
{
if (test__start_subtest("dctcp"))
@ -375,4 +393,6 @@ void test_bpf_tcp_ca(void)
test_write_sk_pacing();
if (test__start_subtest("incompl_cong_ops"))
test_incompl_cong_ops();
if (test__start_subtest("unsupp_cong_op"))
test_unsupp_cong_op();
}

21
tools/testing/selftests/bpf/progs/tcp_ca_unsupp_cong_op.c Normal file
View File

@ -0,0 +1,21 @@
// SPDX-License-Identifier: GPL-2.0
#include "vmlinux.h"
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
char _license[] SEC("license") = "GPL";
SEC("struct_ops/unsupp_cong_op_get_info")
size_t BPF_PROG(unsupp_cong_op_get_info, struct sock *sk, u32 ext, int *attr,
union tcp_cc_info *info)
{
return 0;
}
SEC(".struct_ops")
struct tcp_congestion_ops unsupp_cong_op = {
.get_info = (void *)unsupp_cong_op_get_info,
.name = "bpf_unsupp_op",
};