1*574ee209SMartin KaFai Lau // SPDX-License-Identifier: GPL-2.0
2*574ee209SMartin KaFai Lau /* Copyright (c) 2021 Facebook */
3*574ee209SMartin KaFai Lau 
4*574ee209SMartin KaFai Lau #include <stddef.h>
5*574ee209SMartin KaFai Lau #include <linux/bpf.h>
6*574ee209SMartin KaFai Lau #include <linux/types.h>
7*574ee209SMartin KaFai Lau #include <linux/stddef.h>
8*574ee209SMartin KaFai Lau #include <linux/tcp.h>
9*574ee209SMartin KaFai Lau #include <bpf/bpf_helpers.h>
10*574ee209SMartin KaFai Lau #include <bpf/bpf_tracing.h>
11*574ee209SMartin KaFai Lau #include "bpf_tcp_helpers.h"
12*574ee209SMartin KaFai Lau 
13*574ee209SMartin KaFai Lau char _license[] SEC("license") = "GPL";
14*574ee209SMartin KaFai Lau const char cubic[] = "cubic";
15*574ee209SMartin KaFai Lau 
BPF_STRUCT_OPS(dctcp_nouse_release,struct sock * sk)16*574ee209SMartin KaFai Lau void BPF_STRUCT_OPS(dctcp_nouse_release, struct sock *sk)
17*574ee209SMartin KaFai Lau {
18*574ee209SMartin KaFai Lau 	bpf_setsockopt(sk, SOL_TCP, TCP_CONGESTION,
19*574ee209SMartin KaFai Lau 		       (void *)cubic, sizeof(cubic));
20*574ee209SMartin KaFai Lau }
21*574ee209SMartin KaFai Lau 
22*574ee209SMartin KaFai Lau SEC(".struct_ops")
23*574ee209SMartin KaFai Lau struct tcp_congestion_ops dctcp_rel = {
24*574ee209SMartin KaFai Lau 	.release	= (void *)dctcp_nouse_release,
25*574ee209SMartin KaFai Lau 	.name		= "bpf_dctcp_rel",
26*574ee209SMartin KaFai Lau };
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