This patch implemented the simplest MPTCP scheduler, named bpf_first,
which always picks the first subflow to send data.
Signed-off-by: Geliang Tang <geliang.tang@suse.com>
---
tools/testing/selftests/bpf/bpf_tcp_helpers.h | 12 ++++++++++
tools/testing/selftests/bpf/progs/bpf_first.c | 24 +++++++++++++++++++
2 files changed, 36 insertions(+)
create mode 100644 tools/testing/selftests/bpf/progs/bpf_first.c
diff --git a/tools/testing/selftests/bpf/bpf_tcp_helpers.h b/tools/testing/selftests/bpf/bpf_tcp_helpers.h
index f92357597e63..5bb21b24231f 100644
--- a/tools/testing/selftests/bpf/bpf_tcp_helpers.h
+++ b/tools/testing/selftests/bpf/bpf_tcp_helpers.h
@@ -197,6 +197,18 @@ struct tcp_congestion_ops {
void *owner;
};
+#define MPTCP_SCHED_NAME_MAX 16
+
+struct mptcp_sched_ops {
+ char name[MPTCP_SCHED_NAME_MAX];
+
+ void (*init)(struct mptcp_sock *msk);
+ void (*release)(struct mptcp_sock *msk);
+
+ struct sock * (*get_subflow)(struct mptcp_sock *msk);
+ void *owner;
+};
+
#define min(a, b) ((a) < (b) ? (a) : (b))
#define max(a, b) ((a) > (b) ? (a) : (b))
#define min_not_zero(x, y) ({ \
diff --git a/tools/testing/selftests/bpf/progs/bpf_first.c b/tools/testing/selftests/bpf/progs/bpf_first.c
new file mode 100644
index 000000000000..ad6822d61741
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/bpf_first.c
@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright (c) 2022, SUSE. */
+
+#include <linux/bpf.h>
+#include "bpf_tcp_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)
+{
+}
+
+struct sock *BPF_STRUCT_OPS(bpf_first_get_subflow, struct mptcp_sock *msk)
+{
+ return msk->first;
+}
+
+SEC(".struct_ops")
+struct mptcp_sched_ops first = {
+ .init = (void *)mptcp_sched_first_init,
+ .get_subflow = (void *)bpf_first_get_subflow,
+ .name = "bpf_first",
+};
--
2.34.1