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- /* Tom Kelly's Scalable TCP
- *
- * See http://www.deneholme.net/tom/scalable/
- *
- * John Heffner <jheffner@sc.edu>
- */
- #include <linux/module.h>
- #include <net/tcp.h>
- /* These factors derived from the recommended values in the aer:
- * .01 and and 7/8. We use 50 instead of 100 to account for
- * delayed ack.
- */
- #define TCP_SCALABLE_AI_CNT 50U
- #define TCP_SCALABLE_MD_SCALE 3
- static void tcp_scalable_cong_avoid(struct sock *sk, u32 ack, u32 in_flight)
- {
- struct tcp_sock *tp = tcp_sk(sk);
- if (!tcp_is_cwnd_limited(sk, in_flight))
- return;
- if (tp->snd_cwnd <= tp->snd_ssthresh)
- tcp_slow_start(tp);
- else
- tcp_cong_avoid_ai(tp, min(tp->snd_cwnd, TCP_SCALABLE_AI_CNT));
- }
- static u32 tcp_scalable_ssthresh(struct sock *sk)
- {
- const struct tcp_sock *tp = tcp_sk(sk);
- return max(tp->snd_cwnd - (tp->snd_cwnd>>TCP_SCALABLE_MD_SCALE), 2U);
- }
- static struct tcp_congestion_ops tcp_scalable __read_mostly = {
- .ssthresh = tcp_scalable_ssthresh,
- .cong_avoid = tcp_scalable_cong_avoid,
- .min_cwnd = tcp_reno_min_cwnd,
- .owner = THIS_MODULE,
- .name = "scalable",
- };
- static int __init tcp_scalable_register(void)
- {
- return tcp_register_congestion_control(&tcp_scalable);
- }
- static void __exit tcp_scalable_unregister(void)
- {
- tcp_unregister_congestion_control(&tcp_scalable);
- }
- module_init(tcp_scalable_register);
- module_exit(tcp_scalable_unregister);
- MODULE_AUTHOR("John Heffner");
- MODULE_LICENSE("GPL");
- MODULE_DESCRIPTION("Scalable TCP");
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