[PATCH bpf-next v5 3/3] libbpf: add selftests for TC-BPF API

Kumar Kartikeya Dwivedi
2021-04-28T16:26:19Z

This adds some basic tests for the low level bpf_tc_* API.

Reviewed-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
---
.../testing/selftests/bpf/prog_tests/tc_bpf.c | 467 ++++++++++++++++++
.../testing/selftests/bpf/progs/test_tc_bpf.c | 12 +
2 files changed, 479 insertions(+)
create mode 100644 tools/testing/selftests/bpf/prog_tests/tc_bpf.c
create mode 100644 tools/testing/selftests/bpf/progs/test_tc_bpf.c

diff --git a/tools/testing/selftests/bpf/prog_tests/tc_bpf.c b/tools/testing/selftests/bpf/prog_tests/tc_bpf.c
new file mode 100644
index 000000000000..40441f4e23e2
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/tc_bpf.c
@@ -0,0 +1,467 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <test_progs.h>
+#include <linux/pkt_cls.h>
+
+#include "test_tc_bpf.skel.h"
+
+#define LO_IFINDEX 1
+
+static int test_tc_internal(const struct bpf_tc_hook *hook, int fd)
+{
+ DECLARE_LIBBPF_OPTS(bpf_tc_opts, opts, .handle = 1, .priority = 1,
+ .prog_fd = fd);
+ struct bpf_prog_info info = {};
+ int ret;
+
+ ret = bpf_obj_get_info_by_fd(fd, &info, &(__u32){sizeof(info)});
+ if (!ASSERT_OK(ret, "bpf_obj_get_info_by_fd"))
+ return ret;
+
+ ret = bpf_tc_attach(hook, &opts, 0);
+ if (!ASSERT_OK(ret, "bpf_tc_attach"))
+ return ret;
+
+ if (!ASSERT_EQ(opts.handle, 1, "handle set") ||
+ !ASSERT_EQ(opts.priority, 1, "priority set") ||
+ !ASSERT_EQ(opts.prog_id, info.id, "prog_id set"))
+ goto end;
+
+ DECLARE_LIBBPF_OPTS(bpf_tc_opts, info_opts, .prog_fd = fd);
+ ret = bpf_tc_query(hook, &info_opts);
+ if (!ASSERT_OK(ret, "bpf_tc_query"))
+ goto end;
+
+ DECLARE_LIBBPF_OPTS(bpf_tc_opts, info_opts2, .prog_id = info.id);
+ ret = bpf_tc_query(hook, &info_opts2);
+ if (!ASSERT_OK(ret, "bpf_tc_query"))
+ goto end;
+
+ if (!ASSERT_EQ(opts.handle, 1, "handle set") ||
+ !ASSERT_EQ(opts.priority, 1, "priority set") ||
+ !ASSERT_EQ(opts.prog_id, info.id, "prog_id set"))
+ goto end;
+
+ opts.prog_id = 0;
+ ret = bpf_tc_attach(hook, &opts, BPF_TC_F_REPLACE);
+ if (!ASSERT_OK(ret, "bpf_tc_attach replace mode"))
+ return ret;
+
+end:
+ opts.prog_fd = opts.prog_id = 0;
+ ret = bpf_tc_detach(hook, &opts);
+ ASSERT_OK(ret, "bpf_tc_detach");
+ return ret;
+}
+
+static int test_tc_bpf_api(struct bpf_tc_hook *hook, int fd)
+{
+ DECLARE_LIBBPF_OPTS(bpf_tc_opts, opts, .handle = 1, .priority = 1);
+ DECLARE_LIBBPF_OPTS(bpf_tc_opts, attach_opts, .handle = 1, .priority = 1,
+ .prog_fd = fd);
+ DECLARE_LIBBPF_OPTS(bpf_tc_hook, inv_hook, .attach_point = BPF_TC_INGRESS);
+ int ret;
+
+ ret = bpf_tc_hook_create(NULL, 0);
+ if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_hook_create invalid hook = NULL"))
+ return -EINVAL;
+
+ ret = bpf_tc_hook_create(hook, 42);
+ if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_hook_create invalid flags"))
+ return -EINVAL;
+ ret = bpf_tc_hook_destroy(NULL);
+ if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_hook_destroy invalid hook = NULL"))
+ return -EINVAL;
+
+ /* hook ifindex = 0 */
+ ret = bpf_tc_hook_create(&inv_hook, 0);
+ if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_hook_create invalid hook ifindex == 0"))
+ return -EINVAL;
+ ret = bpf_tc_hook_destroy(&inv_hook);
+ if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_hook_destroy invalid hook ifindex == 0"))
+ return -EINVAL;
+ ret = bpf_tc_attach(&inv_hook, &attach_opts, 0);
+ if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_attach invalid hook ifindex == 0"))
+ return -EINVAL;
+ ret = bpf_tc_detach(&inv_hook, &opts);
+ if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_detach invalid hook ifindex == 0"))
+ return -EINVAL;
+ ret = bpf_tc_query(&inv_hook, &opts);
+ if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_query invalid hook ifindex == 0"))
+ return -EINVAL;
+
+ /* hook ifindex < 0 */
+ inv_hook.ifindex = -1;
+ ret = bpf_tc_hook_create(&inv_hook, 0);
+ if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_hook_create invalid hook ifindex < 0"))
+ return -EINVAL;
+ ret = bpf_tc_hook_destroy(&inv_hook);
+ if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_hook_destroy invalid hook ifindex < 0"))
+ return -EINVAL;
+ ret = bpf_tc_attach(&inv_hook, &attach_opts, 0);
+ if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_attach invalid hook ifindex < 0"))
+ return -EINVAL;
+ ret = bpf_tc_detach(&inv_hook, &opts);
+ if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_detach invalid hook ifindex < 0"))
+ return -EINVAL;
+ ret = bpf_tc_query(&inv_hook, &opts);
+ if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_query invalid hook ifindex < 0"))
+ return -EINVAL;
+ inv_hook.ifindex = LO_IFINDEX;
+
+ /* hook.attach_point invalid */
+ inv_hook.attach_point = 0xabcd;
+ ret = bpf_tc_hook_create(&inv_hook, 0);
+ if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_hook_create invalid hook.attach_point"))
+ return -EINVAL;
+ ret = bpf_tc_hook_destroy(&inv_hook);
+ if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_hook_destroy invalid hook.attach_point"))
+ return -EINVAL;
+ ret = bpf_tc_attach(&inv_hook, &attach_opts, 0);
+ if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_attach invalid hook.attach_point"))
+ return -EINVAL;
+ ret = bpf_tc_detach(&inv_hook, &opts);
+ if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_detach invalid hook.attach_point"))
+ return -EINVAL;
+ ret = bpf_tc_query(&inv_hook, &opts);
+ if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_query invalid hook.attach_point"))
+ return -EINVAL;
+ inv_hook.attach_point = BPF_TC_INGRESS;
+
+ /* hook.attach_point valid, but parent invalid */
+ inv_hook.parent = TC_H_MAKE(1UL << 16, 10);
+ ret = bpf_tc_hook_create(&inv_hook, 0);
+ if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_hook_create invalid hook parent"))
+ return -EINVAL;
+ ret = bpf_tc_hook_destroy(&inv_hook);
+ if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_hook_destroy invalid hook parent"))
+ return -EINVAL;
+ ret = bpf_tc_attach(&inv_hook, &attach_opts, 0);
+ if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_attach invalid hook parent"))
+ return -EINVAL;
+ ret = bpf_tc_detach(&inv_hook, &opts);
+ if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_detach invalid hook parent"))
+ return -EINVAL;
+ ret = bpf_tc_query(&inv_hook, &opts);
+ if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_query invalid hook parent"))
+ return -EINVAL;
+
+ inv_hook.attach_point = BPF_TC_CUSTOM;
+ inv_hook.parent = 0;
+ /* These return EOPNOTSUPP instead of EINVAL as parent is checked after
+ * attach_point of the hook.
+ */
+ ret = bpf_tc_hook_create(&inv_hook, 0);
+ if (!ASSERT_EQ(ret, -EOPNOTSUPP, "bpf_tc_hook_create invalid hook parent"))
+ return -EINVAL;
+ ret = bpf_tc_hook_destroy(&inv_hook);
+ if (!ASSERT_EQ(ret, -EOPNOTSUPP, "bpf_tc_hook_destroy invalid hook parent"))
+ return -EINVAL;
+ ret = bpf_tc_attach(&inv_hook, &attach_opts, 0);
+ if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_attach invalid hook parent"))
+ return -EINVAL;
+ ret = bpf_tc_detach(&inv_hook, &opts);
+ if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_detach invalid hook parent"))
+ return -EINVAL;
+ ret = bpf_tc_query(&inv_hook, &opts);
+ if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_query invalid hook parent"))
+ return -EINVAL;
+ inv_hook.attach_point = BPF_TC_INGRESS;
+
+ /* detach */
+ ret = bpf_tc_detach(NULL, &opts);
+ if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_detach invalid hook = NULL"))
+ return -EINVAL;
+ opts.prog_fd = 42;
+ ret = bpf_tc_detach(hook, &opts);
+ if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_detach invalid prog_fd set"))
+ return -EINVAL;
+ opts.prog_fd = 0;
+ opts.prog_id = 42;
+ ret = bpf_tc_detach(hook, &opts);
+ if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_detach invalid prog_id set"))
+ return -EINVAL;
+ opts.prog_id = 0;
+ opts.handle = 0;
+ ret = bpf_tc_detach(hook, &opts);
+ if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_detach invalid handle unset"))
+ return -EINVAL;
+ opts.handle = 1;
+ opts.priority = 0;
+ ret = bpf_tc_detach(hook, &opts);
+ if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_detach invalid priority unset"))
+ return -EINVAL;
+ opts.priority = UINT16_MAX + 1;
+ ret = bpf_tc_detach(hook, &opts);
+ if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_detach invalid priority > UINT16_MAX"))
+ return -EINVAL;
+ opts.priority = 1;
+ ret = bpf_tc_detach(hook, NULL);
+ if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_detach invalid opts = NULL"))
+ return -EINVAL;
+
+ /* query */
+ ret = bpf_tc_query(NULL, &opts);
+ if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_query invalid hook = NULL"))
+ return -EINVAL;
+ opts.prog_fd = fd;
+ ret = bpf_tc_query(hook, &opts);
+ if (!ASSERT_EQ(ret, -ENOENT, "bpf_tc_query valid only prog_fd set"))
+ return -EINVAL;
+ opts.prog_fd = 0;
+ opts.prog_id = 42;
+ ret = bpf_tc_query(hook, &opts);
+ if (!ASSERT_EQ(ret, -ENOENT, "bpf_tc_query valid only prog_id set"))
+ return -EINVAL;
+ opts.prog_fd = opts.prog_id = 42;
+ ret = bpf_tc_query(hook, &opts);
+ if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_query invalid both prog_fd and prog_id set"))
+ return -EINVAL;
+ opts.prog_fd = opts.prog_id = 0;
+ opts.handle = 0;
+ ret = bpf_tc_query(hook, &opts);
+ if (!ASSERT_EQ(ret, -ENOENT, "bpf_tc_query valid handle unset"))
+ return -EINVAL;
+ opts.handle = 1;
+ opts.priority = 0;
+ ret = bpf_tc_query(hook, &opts);
+ if (!ASSERT_EQ(ret, -ENOENT, "bpf_tc_query valid priority unset"))
+ return -EINVAL;
+ opts.priority = UINT16_MAX + 1;
+ ret = bpf_tc_query(hook, &opts);
+ if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_query invalid priority > UINT16_MAX"))
+ return -EINVAL;
+ opts.priority = 1;
+ ret = bpf_tc_query(hook, NULL);
+ if (!ASSERT_EQ(ret, -ENOENT, "bpf_tc_query valid opts = NULL"))
+ return -EINVAL;
+
+ /* attach */
+ ret = bpf_tc_attach(NULL, &attach_opts, 0);
+ if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_attach invalid hook = NULL"))
+ return -EINVAL;
+ ret = bpf_tc_attach(hook, &attach_opts, 42);
+ if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_attach invalid flags"))
+ return -EINVAL;
+ attach_opts.prog_fd = 0;
+ ret = bpf_tc_attach(hook, &attach_opts, 0);
+ if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_attach invalid prog_fd unset"))
+ return -EINVAL;
+ attach_opts.prog_fd = fd;
+ attach_opts.prog_id = 42;
+ ret = bpf_tc_attach(hook, &attach_opts, 0);
+ if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_attach invalid prog_id set"))
+ return -EINVAL;
+ attach_opts.prog_id = 0;
+ attach_opts.handle = 0;
+ ret = bpf_tc_attach(hook, &attach_opts, 0);
+ if (!ASSERT_OK(ret, "bpf_tc_attach valid handle unset"))
+ return -EINVAL;
+ attach_opts.prog_fd = attach_opts.prog_id = 0;
+ ASSERT_OK(bpf_tc_detach(hook, &attach_opts), "bpf_tc_detach");
+ attach_opts.prog_fd = fd;
+ attach_opts.handle = 1;
+ attach_opts.priority = 0;
+ ret = bpf_tc_attach(hook, &attach_opts, 0);
+ if (!ASSERT_OK(ret, "bpf_tc_attach valid priority unset"))
+ return -EINVAL;
+ attach_opts.prog_fd = attach_opts.prog_id = 0;
+ ASSERT_OK(bpf_tc_detach(hook, &attach_opts), "bpf_tc_detach");
+ attach_opts.prog_fd = fd;
+ attach_opts.priority = UINT16_MAX + 1;
+ ret = bpf_tc_attach(hook, &attach_opts, 0);
+ if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_attach invalid priority > UINT16_MAX"))
+ return -EINVAL;
+ attach_opts.priority = 0;
+ attach_opts.handle = attach_opts.priority = 0;
+ ret = bpf_tc_attach(hook, &attach_opts, 0);
+ if (!ASSERT_OK(ret, "bpf_tc_attach valid both handle and priority unset"))
+ return -EINVAL;
+ attach_opts.prog_fd = attach_opts.prog_id = 0;
+ ASSERT_OK(bpf_tc_detach(hook, &attach_opts), "bpf_tc_detach");
+ ret = bpf_tc_attach(hook, NULL, 0);
+ if (!ASSERT_EQ(ret, -EINVAL, "bpf_tc_attach invalid opts = NULL"))
+ return -EINVAL;
+
+ return 0;
+}
+
+static int test_tc_query(const struct bpf_tc_hook *hook, int fd)
+{
+ struct test_tc_bpf *skel = NULL;
+ int new_fd, ret, i = 0;
+
+ skel = test_tc_bpf__open_and_load();
+ if (!ASSERT_OK_PTR(skel, "test_tc_bpf__open_and_load"))
+ return -EINVAL;
+
+ new_fd = bpf_program__fd(skel->progs.cls);
+
+ /* make sure no other filters are attached */
+ ret = bpf_tc_query(hook, NULL);
+ if (!ASSERT_EQ(ret, -ENOENT, "bpf_tc_query == -ENOENT"))
+ goto end_destroy;
+
+ for (i = 0; i < 5; i++) {
+ DECLARE_LIBBPF_OPTS(bpf_tc_opts, opts, .prog_fd = fd);
+ ret = bpf_tc_attach(hook, &opts, 0);
+ if (!ASSERT_OK(ret, "bpf_tc_attach"))
+ goto end;
+ }
+ DECLARE_LIBBPF_OPTS(bpf_tc_opts, opts, .handle = 1, .priority = 1,
+ .prog_fd = new_fd);
+ ret = bpf_tc_attach(hook, &opts, 0);
+ if (!ASSERT_OK(ret, "bpf_tc_attach"))
+ goto end;
+ i++;
+
+ ASSERT_EQ(opts.handle, 1, "handle match");
+ ASSERT_EQ(opts.priority, 1, "priority match");
+ ASSERT_NEQ(opts.prog_id, 0, "prog_id set");
+
+ opts.prog_fd = 0;
+ /* search with handle, priority, prog_id */
+ ret = bpf_tc_query(hook, &opts);
+ if (!ASSERT_OK(ret, "bpf_tc_query"))
+ goto end;
+
+ ASSERT_EQ(opts.handle, 1, "handle match");
+ ASSERT_EQ(opts.priority, 1, "priority match");
+ ASSERT_NEQ(opts.prog_id, 0, "prog_id set");
+
+ opts.priority = opts.prog_fd = 0;
+ /* search with handle, prog_id */
+ ret = bpf_tc_query(hook, &opts);
+ if (!ASSERT_OK(ret, "bpf_tc_query"))
+ goto end;
+
+ ASSERT_EQ(opts.handle, 1, "handle match");
+ ASSERT_EQ(opts.priority, 1, "priority match");
+ ASSERT_NEQ(opts.prog_id, 0, "prog_id set");
+
+ opts.handle = opts.prog_fd = 0;
+ /* search with priority, prog_id */
+ ret = bpf_tc_query(hook, &opts);
+ if (!ASSERT_OK(ret, "bpf_tc_query"))
+ goto end;
+
+ ASSERT_EQ(opts.handle, 1, "handle match");
+ ASSERT_EQ(opts.priority, 1, "priority match");
+ ASSERT_NEQ(opts.prog_id, 0, "prog_id set");
+
+ opts.handle = opts.priority = opts.prog_fd = 0;
+ /* search with prog_id */
+ ret = bpf_tc_query(hook, &opts);
+ if (!ASSERT_OK(ret, "bpf_tc_query"))
+ goto end;
+
+ ASSERT_EQ(opts.handle, 1, "handle match");
+ ASSERT_EQ(opts.priority, 1, "priority match");
+ ASSERT_NEQ(opts.prog_id, 0, "prog_id set");
+
+ while (i != 1) {
+ DECLARE_LIBBPF_OPTS(bpf_tc_opts, del_opts, .prog_fd = fd);
+ ret = bpf_tc_query(hook, &del_opts);
+ if (!ASSERT_OK(ret, "bpf_tc_query"))
+ goto end;
+ ASSERT_NEQ(del_opts.prog_id, opts.prog_id, "prog_id should not be same");
+ ASSERT_NEQ(del_opts.priority, 1, "priority should not be 1");
+ del_opts.prog_fd = del_opts.prog_id = 0;
+ ret = bpf_tc_detach(hook, &del_opts);
+ if (!ASSERT_OK(ret, "bpf_tc_detach"))
+ goto end;
+ i--;
+ }
+
+ opts.handle = opts.priority = opts.prog_id = 0;
+ opts.prog_fd = fd;
+ ret = bpf_tc_query(hook, &opts);
+ ASSERT_EQ(ret, -ENOENT, "bpf_tc_query == -ENOENT");
+
+end:
+ while (i--) {
+ DECLARE_LIBBPF_OPTS(bpf_tc_opts, del_opts, 0);
+ ret = bpf_tc_query(hook, &del_opts);
+ if (!ASSERT_OK(ret, "bpf_tc_query"))
+ break;
+ del_opts.prog_id = 0;
+ ret = bpf_tc_detach(hook, &del_opts);
+ if (!ASSERT_OK(ret, "bpf_tc_detach"))
+ break;
+ }
+ ASSERT_EQ(bpf_tc_query(hook, NULL), -ENOENT, "bpf_tc_query == -ENOENT");
+end_destroy:
+ test_tc_bpf__destroy(skel);
+ return ret;
+}
+
+void test_tc_bpf(void)
+{
+ struct test_tc_bpf *skel = NULL;
+ bool hook_created = true;
+ int cls_fd, ret;
+
+ skel = test_tc_bpf__open_and_load();
+ if (!ASSERT_OK_PTR(skel, "test_tc_bpf__open_and_load"))
+ return;
+
+ cls_fd = bpf_program__fd(skel->progs.cls);
+
+ DECLARE_LIBBPF_OPTS(bpf_tc_hook, hook, .ifindex = LO_IFINDEX,
+ .attach_point = BPF_TC_INGRESS);
+ ret = bpf_tc_hook_create(&hook, 0);
+ if (ret < 0 && ret == -EEXIST) {
+ hook_created = false;
+ ret = 0;
+ }
+ if (!ASSERT_OK(ret, "bpf_tc_hook_create(BPF_TC_INGRESS)"))
+ goto end;
+
+ hook.attach_point = BPF_TC_CUSTOM;
+ hook.parent = TC_H_MAKE(TC_H_CLSACT, TC_H_MIN_INGRESS);
+ ret = bpf_tc_hook_create(&hook, 0);
+ if (!ASSERT_EQ(ret, -EOPNOTSUPP, "bpf_tc_hook_create invalid hook.attach_point"))
+ goto end;
+
+ ret = test_tc_internal(&hook, cls_fd);
+ if (!ASSERT_OK(ret, "test_tc_internal ingress"))
+ goto end;
+
+ ret = bpf_tc_hook_destroy(&hook);
+ if (!ASSERT_EQ(ret, -EOPNOTSUPP, "bpf_tc_hook_destroy invalid hook.attach_point"))
+ goto end;
+
+ hook.attach_point = BPF_TC_INGRESS;
+ hook.parent = 0;
+ bpf_tc_hook_destroy(&hook);
+
+ ret = test_tc_internal(&hook, cls_fd);
+ if (!ASSERT_OK(ret, "test_tc_internal ingress"))
+ goto end;
+
+ bpf_tc_hook_destroy(&hook);
+
+ hook.attach_point = BPF_TC_EGRESS;
+ ret = test_tc_internal(&hook, cls_fd);
+ if (!ASSERT_OK(ret, "test_tc_internal egress"))
+ goto end;
+
+ bpf_tc_hook_destroy(&hook);
+
+ ret = test_tc_bpf_api(&hook, cls_fd);
+ if (!ASSERT_OK(ret, "test_tc_bpf_api"))
+ goto end;
+
+ bpf_tc_hook_destroy(&hook);
+
+ ret = test_tc_query(&hook, cls_fd);
+ if (!ASSERT_OK(ret, "test_tc_query"))
+ goto end;
+
+end:
+ if (hook_created) {
+ hook.attach_point = BPF_TC_INGRESS|BPF_TC_EGRESS;
+ bpf_tc_hook_destroy(&hook);
+ }
+ test_tc_bpf__destroy(skel);
+}
diff --git a/tools/testing/selftests/bpf/progs/test_tc_bpf.c b/tools/testing/selftests/bpf/progs/test_tc_bpf.c
new file mode 100644
index 000000000000..18a3a7ed924a
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/test_tc_bpf.c
@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+
+/* Dummy prog to test TC-BPF API */
+
+SEC("classifier")
+int cls(struct __sk_buff *skb)
+{
+ return 0;
+}
--
2.30.2