stupid tcp

tcp_stupid.c

/*
 * stupid congestion control
 *
 */

#include <linux/module.h>
#include <net/tcp.h>

static int fixed_cwnd __read_mostly = 1000;
module_param(fixed_cwnd, int, 0644);
MODULE_PARM_DESC(fixed_cwnd, "fixed cwnd");

static void hstcp_init(struct sock *sk)
{
        struct tcp_sock *tp = tcp_sk(sk);

        tp->snd_cwnd_clamp = fixed_cwnd;
        tp->snd_cwnd = fixed_cwnd;
}

static void hstcp_cong_avoid(struct sock *sk, u32 ack, u32 acked)
{
        struct tcp_sock *tp = tcp_sk(sk);

        tp->snd_cwnd = fixed_cwnd;
        tp->snd_cwnd_clamp = fixed_cwnd;
}

static u32 hstcp_ssthresh(struct sock *sk)
{
        return fixed_cwnd;
}

static void on_pkt_acked(struct sock *sk, u32 pkts_acked, s32 rtt)
{
        struct tcp_sock *tp = tcp_sk(sk);

        tp->snd_cwnd = fixed_cwnd;
        tp->snd_cwnd_clamp = fixed_cwnd;
}


static struct tcp_congestion_ops tcp_highspeed __read_mostly = {
        .init           = hstcp_init,
        .ssthresh       = hstcp_ssthresh,
        .cong_avoid     = hstcp_cong_avoid,
        .pkts_acked     = on_pkt_acked,
        .owner          = THIS_MODULE,
        .name           = "htcp"
};

static int __init hstcp_register(void)
{
        return tcp_register_congestion_control(&tcp_highspeed);
}

static void __exit hstcp_unregister(void)
{
        tcp_unregister_congestion_control(&tcp_highspeed);
}

module_init(hstcp_register);
module_exit(hstcp_unregister);

MODULE_AUTHOR("yanfeng lee");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Stupid htcp");