From: Geliang Tang <tanggeliang@kylinos.cn>

Since the kfuncs mptcp_subflow_active() and mptcp_subflow_set_scheduled()
are invoked in the mptcp_subflow bpf_iter test in a trace for
mptcp_subflow_get_send(), it's necessary to register them into a
BPF_PROG_TYPE_TRACING type kfunc set.

Note:

 BTF_KFUNCS_START(bpf_mptcp_sched_kfunc_ids)
 BTF_ID_FLAGS(func, mptcp_subflow_set_scheduled)
 BTF_ID_FLAGS(func, mptcp_subflow_active)
 BTF_KFUNCS_END(bpf_mptcp_sched_kfunc_ids)

Signed-off-by: Geliang Tang <tanggeliang@kylinos.cn>
---
 net/mptcp/bpf.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/mptcp/bpf.c b/net/mptcp/bpf.c
index cda09bbfd617..01aedaff66ed 100644
--- a/net/mptcp/bpf.c
+++ b/net/mptcp/bpf.c
@@ -301,6 +301,8 @@ static int __init bpf_mptcp_kfunc_init(void)
 	int ret;
 
 	ret = register_btf_fmodret_id_set(&bpf_mptcp_fmodret_set);
+	ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING,
+					       &bpf_mptcp_sched_kfunc_set);
 	ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_STRUCT_OPS,
 					       &bpf_mptcp_sched_kfunc_set);
 #ifdef CONFIG_BPF_JIT
-- 
2.43.0