tools/testing/selftests/bpf/progs/tcp_ca_update.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/bpf/progs/tcp_ca_update.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/bpf/progs/tcp_ca_update.c
Extension
.c
Size
1675 bytes
Lines
75
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0

#include "bpf_tracing_net.h"
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>

char _license[] SEC("license") = "GPL";

int ca1_cnt = 0;
int ca2_cnt = 0;

SEC("struct_ops")
void BPF_PROG(ca_update_1_init, struct sock *sk)
{
	ca1_cnt++;
}

SEC("struct_ops")
void BPF_PROG(ca_update_2_init, struct sock *sk)
{
	ca2_cnt++;
}

SEC("struct_ops")
void BPF_PROG(ca_update_cong_control, struct sock *sk,
	      const struct rate_sample *rs)
{
}

SEC("struct_ops")
__u32 BPF_PROG(ca_update_ssthresh, struct sock *sk)
{
	return tcp_sk(sk)->snd_ssthresh;
}

SEC("struct_ops")
__u32 BPF_PROG(ca_update_undo_cwnd, struct sock *sk)
{
	return tcp_sk(sk)->snd_cwnd;
}

SEC(".struct_ops.link")
struct tcp_congestion_ops ca_update_1 = {
	.init = (void *)ca_update_1_init,
	.cong_control = (void *)ca_update_cong_control,
	.ssthresh = (void *)ca_update_ssthresh,
	.undo_cwnd = (void *)ca_update_undo_cwnd,
	.name = "tcp_ca_update",
};

SEC(".struct_ops.link")
struct tcp_congestion_ops ca_update_2 = {
	.init = (void *)ca_update_2_init,
	.cong_control = (void *)ca_update_cong_control,
	.ssthresh = (void *)ca_update_ssthresh,
	.undo_cwnd = (void *)ca_update_undo_cwnd,
	.name = "tcp_ca_update",
};

SEC(".struct_ops.link")
struct tcp_congestion_ops ca_wrong = {
	.cong_control = (void *)ca_update_cong_control,
	.ssthresh = (void *)ca_update_ssthresh,
	.undo_cwnd = (void *)ca_update_undo_cwnd,
	.name = "tcp_ca_wrong",
};

SEC(".struct_ops")
struct tcp_congestion_ops ca_no_link = {
	.cong_control = (void *)ca_update_cong_control,
	.ssthresh = (void *)ca_update_ssthresh,
	.undo_cwnd = (void *)ca_update_undo_cwnd,
	.name = "tcp_ca_no_link",
};

Annotation

Implementation Notes