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// SPDX-License-Identifier: GPL-2.0
#include "vmlinux.h"
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
char _license[] SEC("license") = "GPL";
#define USEC_PER_SEC 1000000UL
#define min(a, b) ((a) < (b) ? (a) : (b))
static inline struct tcp_sock *tcp_sk(const struct sock *sk)
{
return (struct tcp_sock *)sk;
}
static inline unsigned int tcp_left_out(const struct tcp_sock *tp)
{
return tp->sacked_out + tp->lost_out;
}
static inline unsigned int tcp_packets_in_flight(const struct tcp_sock *tp)
{
return tp->packets_out - tcp_left_out(tp) + tp->retrans_out;
}
SEC("struct_ops/write_sk_pacing_init")
void BPF_PROG(write_sk_pacing_init, struct sock *sk)
{
#ifdef ENABLE_ATOMICS_TESTS
__sync_bool_compare_and_swap(&sk->sk_pacing_status, SK_PACING_NONE,
SK_PACING_NEEDED);
#else
sk->sk_pacing_status = SK_PACING_NEEDED;
#endif
}
SEC("struct_ops/write_sk_pacing_cong_control")
void BPF_PROG(write_sk_pacing_cong_control, struct sock *sk,
const struct rate_sample *rs)
{
struct tcp_sock *tp = tcp_sk(sk);
unsigned long rate =
((tp->snd_cwnd * tp->mss_cache * USEC_PER_SEC) << 3) /
(tp->srtt_us ?: 1U << 3);
sk->sk_pacing_rate = min(rate, sk->sk_max_pacing_rate);
tp->app_limited = (tp->delivered + tcp_packets_in_flight(tp)) ?: 1;
}
SEC("struct_ops/write_sk_pacing_ssthresh")
__u32 BPF_PROG(write_sk_pacing_ssthresh, struct sock *sk)
{
return tcp_sk(sk)->snd_ssthresh;
}
SEC("struct_ops/write_sk_pacing_undo_cwnd")
__u32 BPF_PROG(write_sk_pacing_undo_cwnd, struct sock *sk)
{
return tcp_sk(sk)->snd_cwnd;
}
SEC(".struct_ops")
struct tcp_congestion_ops write_sk_pacing = {
.init = (void *)write_sk_pacing_init,
.cong_control = (void *)write_sk_pacing_cong_control,
.ssthresh = (void *)write_sk_pacing_ssthresh,
.undo_cwnd = (void *)write_sk_pacing_undo_cwnd,
.name = "bpf_w_sk_pacing",
};
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