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charset="utf-8" This patch implements a new helper bpf_mptcp_get_next_subflow() to get the next available subflow of msk. Register this helper in bpf_mptcp_sched_kfunc_init() to make sure it can be invoked from the BPF context. Signed-off-by: Geliang Tang --- net/mptcp/bpf.c | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) diff --git a/net/mptcp/bpf.c b/net/mptcp/bpf.c index a3c41c079fe4..94671d5e80d1 100644 --- a/net/mptcp/bpf.c +++ b/net/mptcp/bpf.c @@ -114,6 +114,22 @@ struct bpf_struct_ops bpf_mptcp_sched_ops =3D { .name =3D "mptcp_sched_ops", }; =20 +BTF_SET_START(bpf_mptcp_sched_kfunc_ids) +BTF_ID(func, bpf_mptcp_get_next_subflow) +BTF_SET_END(bpf_mptcp_sched_kfunc_ids) + +static const struct btf_kfunc_id_set bpf_mptcp_sched_kfunc_set =3D { + .owner =3D THIS_MODULE, + .check_set =3D &bpf_mptcp_sched_kfunc_ids, +}; + +static int __init bpf_mptcp_sched_kfunc_init(void) +{ + return register_btf_kfunc_id_set(BPF_PROG_TYPE_STRUCT_OPS, + &bpf_mptcp_sched_kfunc_set); +} +late_initcall(bpf_mptcp_sched_kfunc_init); + struct mptcp_sock *bpf_mptcp_sock_from_subflow(struct sock *sk) { if (sk && sk_fullsock(sk) && sk->sk_protocol =3D=3D IPPROTO_TCP && sk_is_= mptcp(sk)) @@ -122,3 +138,21 @@ struct mptcp_sock *bpf_mptcp_sock_from_subflow(struct = sock *sk) return NULL; } EXPORT_SYMBOL(bpf_mptcp_sock_from_subflow); + +struct mptcp_subflow_context *bpf_mptcp_get_next_subflow(struct mptcp_sock= *msk) +{ + struct mptcp_subflow_context *subflow, *next; + + next =3D list_first_entry_or_null(&msk->conn_list, typeof(*subflow), node= ); + mptcp_for_each_subflow(msk, subflow) { + if (msk->last_snd && subflow->tcp_sock =3D=3D msk->last_snd) { + if (!list_is_last(&subflow->node, &msk->conn_list)) { + next =3D list_next_entry(subflow, node); + break; + } + } + } + + return next; +} +EXPORT_SYMBOL(bpf_mptcp_get_next_subflow); --=20 2.34.1