This patch implements the simplest MPTCP scheduler, named bpf_first,
which always picks the first subflow to send data. It's a sample of
MPTCP BPF scheduler implementations.
Signed-off-by: Geliang Tang <geliang.tang@suse.com>
---
.../selftests/bpf/progs/mptcp_bpf_first.c | 32 +++++++++++++++++++
1 file changed, 32 insertions(+)
create mode 100644 tools/testing/selftests/bpf/progs/mptcp_bpf_first.c
diff --git a/tools/testing/selftests/bpf/progs/mptcp_bpf_first.c b/tools/testing/selftests/bpf/progs/mptcp_bpf_first.c
new file mode 100644
index 000000000000..0ca9754c078d
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/mptcp_bpf_first.c
@@ -0,0 +1,32 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2022, SUSE. */
+
+#include <linux/bpf.h>
+#include "bpf_mptcp_helpers.h"
+
+char _license[] SEC("license") = "GPL";
+
+SEC("struct_ops/mptcp_sched_first_init")
+void BPF_PROG(mptcp_sched_first_init, struct mptcp_sock *msk)
+{
+}
+
+SEC("struct_ops/mptcp_sched_first_release")
+void BPF_PROG(mptcp_sched_first_release, struct mptcp_sock *msk)
+{
+}
+
+void BPF_STRUCT_OPS(bpf_first_get_subflow, struct mptcp_sock *msk,
+ bool reinject, struct mptcp_sched_data *data)
+{
+ data->sock = msk->first;
+ data->call_again = 0;
+}
+
+SEC(".struct_ops")
+struct mptcp_sched_ops first = {
+ .init = (void *)mptcp_sched_first_init,
+ .release = (void *)mptcp_sched_first_release,
+ .get_subflow = (void *)bpf_first_get_subflow,
+ .name = "bpf_first",
+};
--
2.34.1