/* Tom Kelly's Scalable TCP * * See htt://www-lce.eng.cam.ac.uk/~ctk21/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 { tp->snd_cwnd_cnt++; if (tp->snd_cwnd_cnt > min(tp->snd_cwnd, TCP_SCALABLE_AI_CNT)){ if (tp->snd_cwnd < tp->snd_cwnd_clamp) tp->snd_cwnd++; tp->snd_cwnd_cnt = 0; } } } 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 = { .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");