[PATCH bpf-next v2 2/2] selftests/bpf: add tcx netns cookie tests

[Mahe Tardy <mahe.tardy@xxxxxxxxx>]

Add netns cookie test that verifies the helper is now supported and work
in the context of tc programs.

Signed-off-by: Mahe Tardy <mahe.tardy@xxxxxxxxx>
---
 .../selftests/bpf/prog_tests/netns_cookie.c   | 28 ++++++++++++++-----
 .../selftests/bpf/progs/netns_cookie_prog.c   |  9 ++++++
 2 files changed, 30 insertions(+), 7 deletions(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/netns_cookie.c b/tools/testing/selftests/bpf/prog_tests/netns_cookie.c
index 71d8f3ba7d6b..a014082d1e09 100644
--- a/tools/testing/selftests/bpf/prog_tests/netns_cookie.c
+++ b/tools/testing/selftests/bpf/prog_tests/netns_cookie.c
@@ -8,12 +8,16 @@
 #define SO_NETNS_COOKIE 71
 #endif

+#define loopback 1
+
 static int duration;

 void test_netns_cookie(void)
 {
+	LIBBPF_OPTS(bpf_prog_attach_opts, opta);
+	LIBBPF_OPTS(bpf_prog_detach_opts, optd);
 	int server_fd = -1, client_fd = -1, cgroup_fd = -1;
-	int err, val, ret, map, verdict;
+	int err, val, ret, map, verdict, tc_fd;
 	struct netns_cookie_prog *skel;
 	uint64_t cookie_expected_value;
 	socklen_t vallen = sizeof(cookie_expected_value);
@@ -38,36 +42,46 @@ void test_netns_cookie(void)
 	if (!ASSERT_OK(err, "prog_attach"))
 		goto done;

+	tc_fd = bpf_program__fd(skel->progs.get_netns_cookie_tcx);
+	err = bpf_prog_attach_opts(tc_fd, loopback, BPF_TCX_INGRESS, &opta);
+	if (!ASSERT_OK(err, "prog_attach"))
+		goto done;
+
 	server_fd = start_server(AF_INET6, SOCK_STREAM, "::1", 0, 0);
 	if (CHECK(server_fd < 0, "start_server", "errno %d\n", errno))
-		goto done;
+		goto cleanup_tc;

 	client_fd = connect_to_fd(server_fd, 0);
 	if (CHECK(client_fd < 0, "connect_to_fd", "errno %d\n", errno))
-		goto done;
+		goto cleanup_tc;

 	ret = send(client_fd, send_msg, sizeof(send_msg), 0);
 	if (CHECK(ret != sizeof(send_msg), "send(msg)", "ret:%d\n", ret))
-		goto done;
+		goto cleanup_tc;

 	err = bpf_map_lookup_elem(bpf_map__fd(skel->maps.sockops_netns_cookies),
 				  &client_fd, &val);
 	if (!ASSERT_OK(err, "map_lookup(sockops_netns_cookies)"))
-		goto done;
+		goto cleanup_tc;

 	err = getsockopt(client_fd, SOL_SOCKET, SO_NETNS_COOKIE,
 			 &cookie_expected_value, &vallen);
 	if (!ASSERT_OK(err, "getsockopt"))
-		goto done;
+		goto cleanup_tc;

 	ASSERT_EQ(val, cookie_expected_value, "cookie_value");

 	err = bpf_map_lookup_elem(bpf_map__fd(skel->maps.sk_msg_netns_cookies),
 				  &client_fd, &val);
 	if (!ASSERT_OK(err, "map_lookup(sk_msg_netns_cookies)"))
-		goto done;
+		goto cleanup_tc;

 	ASSERT_EQ(val, cookie_expected_value, "cookie_value");
+	ASSERT_EQ(skel->bss->tcx_netns_cookie, cookie_expected_value, "cookie_value");
+
+cleanup_tc:
+	err = bpf_prog_detach_opts(tc_fd, loopback, BPF_TCX_INGRESS, &optd);
+	ASSERT_OK(err, "prog_detach");

 done:
 	if (server_fd != -1)
diff --git a/tools/testing/selftests/bpf/progs/netns_cookie_prog.c b/tools/testing/selftests/bpf/progs/netns_cookie_prog.c
index aeff3a4f9287..207f0e6c20b7 100644
--- a/tools/testing/selftests/bpf/progs/netns_cookie_prog.c
+++ b/tools/testing/selftests/bpf/progs/netns_cookie_prog.c
@@ -27,6 +27,8 @@ struct {
 	__type(value, __u64);
 } sock_map SEC(".maps");

+int tcx_netns_cookie;
+
 SEC("sockops")
 int get_netns_cookie_sockops(struct bpf_sock_ops *ctx)
 {
@@ -81,4 +83,11 @@ int get_netns_cookie_sk_msg(struct sk_msg_md *msg)
 	return 1;
 }

+SEC("tcx/ingress")
+int get_netns_cookie_tcx(struct __sk_buff *skb)
+{
+	tcx_netns_cookie = bpf_get_netns_cookie(skb);
+	return TCX_PASS;
+}
+
 char _license[] SEC("license") = "GPL";
--
2.34.1