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charset="utf-8" This patch implements the setting of stale flag in BPF MPTCP scheduler, named bpf_stale. The stale flag will be set in bpf_stale_data_init() and will be checked in bpf_stale_get_subflow(). Signed-off-by: Geliang Tang --- tools/testing/selftests/bpf/bpf_tcp_helpers.h | 3 +- .../selftests/bpf/progs/mptcp_bpf_stale.c | 63 +++++++++++++++++++ 2 files changed, 65 insertions(+), 1 deletion(-) create mode 100644 tools/testing/selftests/bpf/progs/mptcp_bpf_stale.c diff --git a/tools/testing/selftests/bpf/bpf_tcp_helpers.h b/tools/testing/= selftests/bpf/bpf_tcp_helpers.h index 945dd46c98c0..c749940c9103 100644 --- a/tools/testing/selftests/bpf/bpf_tcp_helpers.h +++ b/tools/testing/selftests/bpf/bpf_tcp_helpers.h @@ -234,7 +234,8 @@ extern void tcp_cong_avoid_ai(struct tcp_sock *tp, __u3= 2 w, __u32 acked) __ksym; #define MPTCP_SUBFLOWS_MAX 8 =20 struct mptcp_subflow_context { - __u32 backup : 1; + __u32 backup : 1, + stale : 1; struct sock *tcp_sock; /* tcp sk backpointer */ } __attribute__((preserve_access_index)); =20 diff --git a/tools/testing/selftests/bpf/progs/mptcp_bpf_stale.c b/tools/te= sting/selftests/bpf/progs/mptcp_bpf_stale.c new file mode 100644 index 000000000000..e8cc2e0c24b9 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/mptcp_bpf_stale.c @@ -0,0 +1,63 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2023, SUSE. */ + +#include +#include "bpf_tcp_helpers.h" + +char _license[] SEC("license") =3D "GPL"; + +extern void mptcp_subflow_set_stale(struct mptcp_subflow_context *subflow, + int stale) __ksym; + +SEC("struct_ops/mptcp_sched_stale_init") +void BPF_PROG(mptcp_sched_stale_init, struct mptcp_sock *msk) +{ +} + +SEC("struct_ops/mptcp_sched_stale_release") +void BPF_PROG(mptcp_sched_stale_release, struct mptcp_sock *msk) +{ +} + +void BPF_STRUCT_OPS(bpf_stale_data_init, struct mptcp_sock *msk, + struct mptcp_sched_data *data) +{ + struct mptcp_subflow_context *subflow; + + mptcp_sched_data_set_contexts(msk, data); + subflow =3D mptcp_subflow_ctx_by_pos(data, 1); + if (subflow) + mptcp_subflow_set_stale(subflow, 1); +} + +int BPF_STRUCT_OPS(bpf_stale_get_subflow, struct mptcp_sock *msk, + const struct mptcp_sched_data *data) +{ + int nr =3D -1; + + for (int i =3D 0; i < data->subflows && i < MPTCP_SUBFLOWS_MAX; i++) { + struct mptcp_subflow_context *subflow; + + subflow =3D mptcp_subflow_ctx_by_pos(data, i); + if (!subflow) + break; + + if (BPF_CORE_READ_BITFIELD_PROBED(subflow, stale)) + continue; + + nr =3D i; + } + + if (nr !=3D -1) + mptcp_subflow_set_scheduled(mptcp_subflow_ctx_by_pos(data, nr), true); + return 0; +} + +SEC(".struct_ops") +struct mptcp_sched_ops stale =3D { + .init =3D (void *)mptcp_sched_stale_init, + .release =3D (void *)mptcp_sched_stale_release, + .data_init =3D (void *)bpf_stale_data_init, + .get_subflow =3D (void *)bpf_stale_get_subflow, + .name =3D "bpf_stale", +}; --=20 2.35.3