110 lines
3.5 KiB
C
110 lines
3.5 KiB
C
|
#include <linux/tcp.h>
|
||
|
|
#include <net/tcp.h>
|
||
|
|
|
||
|
|
int sysctl_tcp_recovery __read_mostly = TCP_RACK_LOST_RETRANS;
|
||
|
|
|
||
|
|
/* Marks a packet lost, if some packet sent later has been (s)acked.
|
||
|
|
* The underlying idea is similar to the traditional dupthresh and FACK
|
||
|
|
* but they look at different metrics:
|
||
|
|
*
|
||
|
|
* dupthresh: 3 OOO packets delivered (packet count)
|
||
|
|
* FACK: sequence delta to highest sacked sequence (sequence space)
|
||
|
|
* RACK: sent time delta to the latest delivered packet (time domain)
|
||
|
|
*
|
||
|
|
* The advantage of RACK is it applies to both original and retransmitted
|
||
|
|
* packet and therefore is robust against tail losses. Another advantage
|
||
|
|
* is being more resilient to reordering by simply allowing some
|
||
|
|
* "settling delay", instead of tweaking the dupthresh.
|
||
|
|
*
|
||
|
|
* The current version is only used after recovery starts but can be
|
||
|
|
* easily extended to detect the first loss.
|
||
|
|
*/
|
||
|
|
int tcp_rack_mark_lost(struct sock *sk)
|
||
|
|
{
|
||
|
|
struct tcp_sock *tp = tcp_sk(sk);
|
||
|
|
struct sk_buff *skb;
|
||
|
|
u32 reo_wnd, prior_retrans = tp->retrans_out;
|
||
|
|
|
||
|
|
if (inet_csk(sk)->icsk_ca_state < TCP_CA_Recovery || !tp->rack.advanced)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
/* Reset the advanced flag to avoid unnecessary queue scanning */
|
||
|
|
tp->rack.advanced = 0;
|
||
|
|
|
||
|
|
/* To be more reordering resilient, allow min_rtt/4 settling delay
|
||
|
|
* (lower-bounded to 1000uS). We use min_rtt instead of the smoothed
|
||
|
|
* RTT because reordering is often a path property and less related
|
||
|
|
* to queuing or delayed ACKs.
|
||
|
|
*
|
||
|
|
* TODO: measure and adapt to the observed reordering delay, and
|
||
|
|
* use a timer to retransmit like the delayed early retransmit.
|
||
|
|
*/
|
||
|
|
reo_wnd = 1000;
|
||
|
|
if (tp->rack.reord && tcp_min_rtt(tp) != ~0U)
|
||
|
|
reo_wnd = max(tcp_min_rtt(tp) >> 2, reo_wnd);
|
||
|
|
|
||
|
|
tcp_for_write_queue(skb, sk) {
|
||
|
|
struct tcp_skb_cb *scb = TCP_SKB_CB(skb);
|
||
|
|
|
||
|
|
if (skb == tcp_send_head(sk))
|
||
|
|
break;
|
||
|
|
|
||
|
|
/* Skip ones already (s)acked */
|
||
|
|
if (!after(scb->end_seq, tp->snd_una) ||
|
||
|
|
scb->sacked & TCPCB_SACKED_ACKED)
|
||
|
|
continue;
|
||
|
|
|
||
|
|
if (skb_mstamp_after(&tp->rack.mstamp, &skb->skb_mstamp)) {
|
||
|
|
|
||
|
|
if (skb_mstamp_us_delta(&tp->rack.mstamp,
|
||
|
|
&skb->skb_mstamp) <= reo_wnd)
|
||
|
|
continue;
|
||
|
|
|
||
|
|
/* skb is lost if packet sent later is sacked */
|
||
|
|
tcp_skb_mark_lost_uncond_verify(tp, skb);
|
||
|
|
if (scb->sacked & TCPCB_SACKED_RETRANS) {
|
||
|
|
scb->sacked &= ~TCPCB_SACKED_RETRANS;
|
||
|
|
tp->retrans_out -= tcp_skb_pcount(skb);
|
||
|
|
NET_INC_STATS(sock_net(sk),
|
||
|
|
LINUX_MIB_TCPLOSTRETRANSMIT);
|
||
|
|
}
|
||
|
|
} else if (!(scb->sacked & TCPCB_RETRANS)) {
|
||
|
|
/* Original data are sent sequentially so stop early
|
||
|
|
* b/c the rest are all sent after rack_sent
|
||
|
|
*/
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return prior_retrans - tp->retrans_out;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Record the most recently (re)sent time among the (s)acked packets */
|
||
|
|
void tcp_rack_advance(struct tcp_sock *tp,
|
||
|
|
const struct skb_mstamp *xmit_time, u8 sacked)
|
||
|
|
{
|
||
|
|
if (tp->rack.mstamp.v64 &&
|
||
|
|
!skb_mstamp_after(xmit_time, &tp->rack.mstamp))
|
||
|
|
return;
|
||
|
|
|
||
|
|
if (sacked & TCPCB_RETRANS) {
|
||
|
|
struct skb_mstamp now;
|
||
|
|
|
||
|
|
/* If the sacked packet was retransmitted, it's ambiguous
|
||
|
|
* whether the retransmission or the original (or the prior
|
||
|
|
* retransmission) was sacked.
|
||
|
|
*
|
||
|
|
* If the original is lost, there is no ambiguity. Otherwise
|
||
|
|
* we assume the original can be delayed up to aRTT + min_rtt.
|
||
|
|
* the aRTT term is bounded by the fast recovery or timeout,
|
||
|
|
* so it's at least one RTT (i.e., retransmission is at least
|
||
|
|
* an RTT later).
|
||
|
|
*/
|
||
|
|
skb_mstamp_get(&now);
|
||
|
|
if (skb_mstamp_us_delta(&now, xmit_time) < tcp_min_rtt(tp))
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
tp->rack.mstamp = *xmit_time;
|
||
|
|
tp->rack.advanced = 1;
|
||
|
|
}
|