![Stephen Hemminger](/assets/img/avatar_default.png)
Many of the TCP congestion methods all just use ssthresh as the minimum congestion window on decrease. Rather than duplicating the code, just have that be the default if that handle in the ops structure is not set. Minor behaviour change to TCP compound. It probably wants to use this (ssthresh) as lower bound, rather than ssthresh/2 because the latter causes undershoot on loss. Signed-off-by: Stephen Hemminger <shemminger@osdl.org> Signed-off-by: David S. Miller <davem@davemloft.net>
232 lines
5.7 KiB
C
232 lines
5.7 KiB
C
/*
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* TCP Veno congestion control
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*
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* This is based on the congestion detection/avoidance scheme described in
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* C. P. Fu, S. C. Liew.
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* "TCP Veno: TCP Enhancement for Transmission over Wireless Access Networks."
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* IEEE Journal on Selected Areas in Communication,
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* Feb. 2003.
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* See http://www.ntu.edu.sg/home5/ZHOU0022/papers/CPFu03a.pdf
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*/
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#include <linux/config.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/skbuff.h>
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#include <linux/inet_diag.h>
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#include <net/tcp.h>
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/* Default values of the Veno variables, in fixed-point representation
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* with V_PARAM_SHIFT bits to the right of the binary point.
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*/
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#define V_PARAM_SHIFT 1
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static const int beta = 3 << V_PARAM_SHIFT;
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/* Veno variables */
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struct veno {
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u8 doing_veno_now; /* if true, do veno for this rtt */
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u16 cntrtt; /* # of rtts measured within last rtt */
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u32 minrtt; /* min of rtts measured within last rtt (in usec) */
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u32 basertt; /* the min of all Veno rtt measurements seen (in usec) */
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u32 inc; /* decide whether to increase cwnd */
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u32 diff; /* calculate the diff rate */
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};
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/* There are several situations when we must "re-start" Veno:
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*
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* o when a connection is established
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* o after an RTO
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* o after fast recovery
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* o when we send a packet and there is no outstanding
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* unacknowledged data (restarting an idle connection)
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*
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*/
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static inline void veno_enable(struct sock *sk)
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{
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struct veno *veno = inet_csk_ca(sk);
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/* turn on Veno */
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veno->doing_veno_now = 1;
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veno->minrtt = 0x7fffffff;
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}
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static inline void veno_disable(struct sock *sk)
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{
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struct veno *veno = inet_csk_ca(sk);
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/* turn off Veno */
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veno->doing_veno_now = 0;
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}
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static void tcp_veno_init(struct sock *sk)
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{
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struct veno *veno = inet_csk_ca(sk);
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veno->basertt = 0x7fffffff;
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veno->inc = 1;
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veno_enable(sk);
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}
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/* Do rtt sampling needed for Veno. */
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static void tcp_veno_rtt_calc(struct sock *sk, u32 usrtt)
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{
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struct veno *veno = inet_csk_ca(sk);
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u32 vrtt = usrtt + 1; /* Never allow zero rtt or basertt */
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/* Filter to find propagation delay: */
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if (vrtt < veno->basertt)
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veno->basertt = vrtt;
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/* Find the min rtt during the last rtt to find
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* the current prop. delay + queuing delay:
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*/
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veno->minrtt = min(veno->minrtt, vrtt);
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veno->cntrtt++;
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}
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static void tcp_veno_state(struct sock *sk, u8 ca_state)
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{
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if (ca_state == TCP_CA_Open)
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veno_enable(sk);
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else
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veno_disable(sk);
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}
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/*
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* If the connection is idle and we are restarting,
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* then we don't want to do any Veno calculations
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* until we get fresh rtt samples. So when we
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* restart, we reset our Veno state to a clean
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* state. After we get acks for this flight of
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* packets, _then_ we can make Veno calculations
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* again.
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*/
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static void tcp_veno_cwnd_event(struct sock *sk, enum tcp_ca_event event)
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{
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if (event == CA_EVENT_CWND_RESTART || event == CA_EVENT_TX_START)
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tcp_veno_init(sk);
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}
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static void tcp_veno_cong_avoid(struct sock *sk, u32 ack,
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u32 seq_rtt, u32 in_flight, int flag)
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{
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struct tcp_sock *tp = tcp_sk(sk);
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struct veno *veno = inet_csk_ca(sk);
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if (!veno->doing_veno_now)
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return tcp_reno_cong_avoid(sk, ack, seq_rtt, in_flight, flag);
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/* limited by applications */
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if (!tcp_is_cwnd_limited(sk, in_flight))
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return;
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/* We do the Veno calculations only if we got enough rtt samples */
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if (veno->cntrtt <= 2) {
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/* We don't have enough rtt samples to do the Veno
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* calculation, so we'll behave like Reno.
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*/
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tcp_reno_cong_avoid(sk, ack, seq_rtt, in_flight, flag);
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} else {
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u32 rtt, target_cwnd;
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/* We have enough rtt samples, so, using the Veno
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* algorithm, we determine the state of the network.
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*/
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rtt = veno->minrtt;
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target_cwnd = ((tp->snd_cwnd * veno->basertt)
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<< V_PARAM_SHIFT) / rtt;
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veno->diff = (tp->snd_cwnd << V_PARAM_SHIFT) - target_cwnd;
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if (tp->snd_cwnd <= tp->snd_ssthresh) {
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/* Slow start. */
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tcp_slow_start(tp);
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} else {
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/* Congestion avoidance. */
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if (veno->diff < beta) {
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/* In the "non-congestive state", increase cwnd
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* every rtt.
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*/
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if (tp->snd_cwnd_cnt >= tp->snd_cwnd) {
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if (tp->snd_cwnd < tp->snd_cwnd_clamp)
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tp->snd_cwnd++;
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tp->snd_cwnd_cnt = 0;
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} else
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tp->snd_cwnd_cnt++;
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} else {
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/* In the "congestive state", increase cwnd
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* every other rtt.
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*/
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if (tp->snd_cwnd_cnt >= tp->snd_cwnd) {
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if (veno->inc
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&& tp->snd_cwnd <
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tp->snd_cwnd_clamp) {
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tp->snd_cwnd++;
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veno->inc = 0;
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} else
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veno->inc = 1;
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tp->snd_cwnd_cnt = 0;
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} else
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tp->snd_cwnd_cnt++;
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}
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}
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if (tp->snd_cwnd < 2)
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tp->snd_cwnd = 2;
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else if (tp->snd_cwnd > tp->snd_cwnd_clamp)
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tp->snd_cwnd = tp->snd_cwnd_clamp;
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}
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/* Wipe the slate clean for the next rtt. */
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/* veno->cntrtt = 0; */
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veno->minrtt = 0x7fffffff;
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}
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/* Veno MD phase */
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static u32 tcp_veno_ssthresh(struct sock *sk)
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{
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const struct tcp_sock *tp = tcp_sk(sk);
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struct veno *veno = inet_csk_ca(sk);
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if (veno->diff < beta)
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/* in "non-congestive state", cut cwnd by 1/5 */
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return max(tp->snd_cwnd * 4 / 5, 2U);
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else
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/* in "congestive state", cut cwnd by 1/2 */
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return max(tp->snd_cwnd >> 1U, 2U);
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}
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static struct tcp_congestion_ops tcp_veno = {
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.init = tcp_veno_init,
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.ssthresh = tcp_veno_ssthresh,
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.cong_avoid = tcp_veno_cong_avoid,
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.rtt_sample = tcp_veno_rtt_calc,
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.set_state = tcp_veno_state,
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.cwnd_event = tcp_veno_cwnd_event,
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.owner = THIS_MODULE,
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.name = "veno",
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};
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static int __init tcp_veno_register(void)
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{
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BUG_ON(sizeof(struct veno) > ICSK_CA_PRIV_SIZE);
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tcp_register_congestion_control(&tcp_veno);
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return 0;
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}
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static void __exit tcp_veno_unregister(void)
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{
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tcp_unregister_congestion_control(&tcp_veno);
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}
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module_init(tcp_veno_register);
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module_exit(tcp_veno_unregister);
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MODULE_AUTHOR("Bin Zhou, Cheng Peng Fu");
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("TCP Veno");
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