diff --git a/tools/testing/selftests/bpf/bpf_experimental.h b/tools/testing/selftests/bpf/bpf_experimental.h
index cd8ecd39c3f3c68d40c6e3e1465b42ed66537027..6a96c56f0725a86ab6e83675ca0e474c3d668b10 100644
--- a/tools/testing/selftests/bpf/bpf_experimental.h
+++ b/tools/testing/selftests/bpf/bpf_experimental.h
@@ -575,6 +575,14 @@ extern int bpf_iter_css_new(struct bpf_iter_css *it,
 extern struct cgroup_subsys_state *bpf_iter_css_next(struct bpf_iter_css *it) __weak __ksym;
 extern void bpf_iter_css_destroy(struct bpf_iter_css *it) __weak __ksym;
 
+struct bpf_iter_mptcp_subflow;
+extern int bpf_iter_mptcp_subflow_new(struct bpf_iter_mptcp_subflow *it,
+				      struct sock *sk) __weak __ksym;
+extern struct mptcp_subflow_context *
+bpf_iter_mptcp_subflow_next(struct bpf_iter_mptcp_subflow *it) __weak __ksym;
+extern void
+bpf_iter_mptcp_subflow_destroy(struct bpf_iter_mptcp_subflow *it) __weak __ksym;
+
 extern int bpf_wq_init(struct bpf_wq *wq, void *p__map, unsigned int flags) __weak __ksym;
 extern int bpf_wq_start(struct bpf_wq *wq, unsigned int flags) __weak __ksym;
 extern int bpf_wq_set_callback_impl(struct bpf_wq *wq,
diff --git a/tools/testing/selftests/bpf/prog_tests/mptcp.c b/tools/testing/selftests/bpf/prog_tests/mptcp.c
index 85f3d4119802a85c86cde7b74a0b857252bad8b8..f37574b5ef68d8f32f8002df317869dfdf1d4b2d 100644
--- a/tools/testing/selftests/bpf/prog_tests/mptcp.c
+++ b/tools/testing/selftests/bpf/prog_tests/mptcp.c
@@ -11,6 +11,7 @@
 #include "mptcp_sock.skel.h"
 #include "mptcpify.skel.h"
 #include "mptcp_subflow.skel.h"
+#include "mptcp_bpf_iters.skel.h"
 
 #define NS_TEST "mptcp_ns"
 #define ADDR_1	"10.0.1.1"
@@ -33,6 +34,9 @@
 #ifndef MPTCP_INFO
 #define MPTCP_INFO		1
 #endif
+#ifndef TCP_IS_MPTCP
+#define TCP_IS_MPTCP		43	/* Is MPTCP being used? */
+#endif
 #ifndef MPTCP_INFO_FLAG_FALLBACK
 #define MPTCP_INFO_FLAG_FALLBACK		_BITUL(0)
 #endif
@@ -480,6 +484,73 @@ static void test_subflow(void)
 	close(cgroup_fd);
 }
 
+static void run_iters_subflow(void)
+{
+	int server_fd, client_fd;
+	int is_mptcp, err;
+	socklen_t len;
+
+	server_fd = start_mptcp_server(AF_INET, ADDR_1, PORT_1, 0);
+	if (!ASSERT_OK_FD(server_fd, "start_mptcp_server"))
+		return;
+
+	client_fd = connect_to_fd(server_fd, 0);
+	if (!ASSERT_OK_FD(client_fd, "connect_to_fd"))
+		goto close_server;
+
+	send_byte(client_fd);
+	wait_for_new_subflows(client_fd);
+
+	len = sizeof(is_mptcp);
+	/* mainly to trigger the BPF program */
+	err = getsockopt(client_fd, SOL_TCP, TCP_IS_MPTCP, &is_mptcp, &len);
+	if (ASSERT_OK(err, "getsockopt(client_fd, TCP_IS_MPTCP)"))
+		ASSERT_EQ(is_mptcp, 1, "is_mptcp");
+
+	close(client_fd);
+close_server:
+	close(server_fd);
+}
+
+static void test_iters_subflow(void)
+{
+	struct mptcp_bpf_iters *skel;
+	struct netns_obj *netns;
+	int cgroup_fd;
+
+	cgroup_fd = test__join_cgroup("/iters_subflow");
+	if (!ASSERT_OK_FD(cgroup_fd, "join_cgroup: iters_subflow"))
+		return;
+
+	skel = mptcp_bpf_iters__open_and_load();
+	if (!ASSERT_OK_PTR(skel, "skel_open_load: iters_subflow"))
+		goto close_cgroup;
+
+	skel->links.iters_subflow = bpf_program__attach_cgroup(skel->progs.iters_subflow,
+							       cgroup_fd);
+	if (!ASSERT_OK_PTR(skel->links.iters_subflow, "attach getsockopt"))
+		goto skel_destroy;
+
+	netns = netns_new(NS_TEST, true);
+	if (!ASSERT_OK_PTR(netns, "netns_new: iters_subflow"))
+		goto skel_destroy;
+
+	if (endpoint_init("subflow", 4) < 0)
+		goto close_netns;
+
+	run_iters_subflow();
+
+	/* 1 + 2 + 3 + 4 = 10 */
+	ASSERT_EQ(skel->bss->ids, 10, "subflow ids");
+
+close_netns:
+	netns_free(netns);
+skel_destroy:
+	mptcp_bpf_iters__destroy(skel);
+close_cgroup:
+	close(cgroup_fd);
+}
+
 void test_mptcp(void)
 {
 	if (test__start_subtest("base"))
@@ -488,4 +559,6 @@ void test_mptcp(void)
 		test_mptcpify();
 	if (test__start_subtest("subflow"))
 		test_subflow();
+	if (test__start_subtest("iters_subflow"))
+		test_iters_subflow();
 }
diff --git a/tools/testing/selftests/bpf/progs/mptcp_bpf.h b/tools/testing/selftests/bpf/progs/mptcp_bpf.h
index 3b188ccdcc4041acb4f7ed38ae8ddf5a7305466a..aa897074de6f377e8cddc859c3b2dc3751f14381 100644
--- a/tools/testing/selftests/bpf/progs/mptcp_bpf.h
+++ b/tools/testing/selftests/bpf/progs/mptcp_bpf.h
@@ -39,4 +39,8 @@ mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow)
 	return subflow->tcp_sock;
 }
 
+/* ksym */
+extern struct mptcp_subflow_context *
+bpf_mptcp_subflow_ctx(const struct sock *sk) __ksym;
+
 #endif
diff --git a/tools/testing/selftests/bpf/progs/mptcp_bpf_iters.c b/tools/testing/selftests/bpf/progs/mptcp_bpf_iters.c
new file mode 100644
index 0000000000000000000000000000000000000000..a1d8f9b20259a9cbdc46d58e0d18157564fa5acd
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/mptcp_bpf_iters.c
@@ -0,0 +1,59 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2024, Kylin Software */
+
+/* vmlinux.h, bpf_helpers.h and other 'define' */
+#include "bpf_tracing_net.h"
+#include "mptcp_bpf.h"
+
+char _license[] SEC("license") = "GPL";
+int ids;
+
+#ifndef TCP_IS_MPTCP
+#define TCP_IS_MPTCP		43	/* Is MPTCP being used? */
+#endif
+
+SEC("cgroup/getsockopt")
+int iters_subflow(struct bpf_sockopt *ctx)
+{
+	struct mptcp_subflow_context *subflow;
+	struct bpf_sock *sk = ctx->sk;
+	struct sock *ssk = NULL;
+	struct mptcp_sock *msk;
+	int local_ids = 0;
+
+	if (ctx->level != SOL_TCP || ctx->optname != TCP_IS_MPTCP)
+		return 1;
+
+	msk = bpf_core_cast(sk, struct mptcp_sock);
+	if (!msk || msk->pm.server_side || !msk->pm.subflows)
+		return 1;
+
+	bpf_for_each(mptcp_subflow, subflow, (struct sock *)sk) {
+		/* Here MPTCP-specific packet scheduler kfunc can be called:
+		 * this test is not doing anything really useful, only to
+		 * verify the iteration works.
+		 */
+
+		local_ids += subflow->subflow_id;
+
+		/* only to check the following helper works */
+		ssk = mptcp_subflow_tcp_sock(subflow);
+	}
+
+	if (!ssk)
+		goto out;
+
+	/* assert: if not OK, something wrong on the kernel side */
+	if (ssk->sk_dport != ((struct sock *)msk)->sk_dport)
+		goto out;
+
+	/* only to check the following kfunc works */
+	subflow = bpf_mptcp_subflow_ctx(ssk);
+	if (!subflow || subflow->token != msk->token)
+		goto out;
+
+	ids = local_ids;
+
+out:
+	return 1;
+}
