Re: [PATCH bpf-next/net v6 3/3] selftests/bpf: Add mptcp subflow subtest

On 9/11/24 8:16 AM, Matthieu Baerts (NGI0) wrote:

+static void test_subflow(void)
+{
+	int cgroup_fd, prog_fd, err;
+	struct mptcp_subflow *skel;
+	struct nstoken *nstoken;
+	struct bpf_link *link;
+
+	cgroup_fd = test__join_cgroup("/mptcp_subflow");
+	if (!ASSERT_OK_FD(cgroup_fd, "join_cgroup: mptcp_subflow"))
+		return;
+
+	skel = mptcp_subflow__open_and_load();
+	if (!ASSERT_OK_PTR(skel, "skel_open_load: mptcp_subflow"))
+		goto close_cgroup;
+
+	skel->bss->pid = getpid();
+
+	err = mptcp_subflow__attach(skel);

This is not needed.

+	if (!ASSERT_OK(err, "skel_attach: mptcp_subflow"))
+		goto skel_destroy;
+
+	prog_fd = bpf_program__fd(skel->progs.mptcp_subflow);
+	err = bpf_prog_attach(prog_fd, cgroup_fd, BPF_CGROUP_SOCK_OPS, 0);

Use bpf_program__attach_cgroup here instead since ...

+	if (!ASSERT_OK(err, "prog_attach"))
+		goto skel_destroy;
+
+	nstoken = create_netns();
+	if (!ASSERT_OK_PTR(nstoken, "create_netns: mptcp_subflow"))
+		goto skel_destroy;
+
+	if (endpoint_init("subflow") < 0)
+		goto close_netns;
+
+	link = bpf_program__attach_cgroup(skel->progs._getsockopt_subflow,
+					  cgroup_fd);

... bpf_program__attach_cgroup is used here also.

Instead of declaring a local "link", use the skel->links.{mptcp_subflow, 
_getsockopt_subflow}. Then mptcp_subflow__destroy(skel) will take care of them 
also. e.g. "skel->links._getsockopt_subflow = bpf_program__attach_cgroup(...)"

pw-bot: cr