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-rw-r--r--net/ipv4/tcp_input.c62
1 files changed, 30 insertions, 32 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 3e98b57578dc..e43065654930 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -548,10 +548,9 @@ static void tcp_event_data_recv(struct sock *sk, struct tcp_sock *tp, struct sk_
* To save cycles in the RFC 1323 implementation it was better to break
* it up into three procedures. -- erics
*/
-static void tcp_rtt_estimator(struct sock *sk, const __u32 mrtt, u32 *usrtt)
+static void tcp_rtt_estimator(struct sock *sk, const __u32 mrtt)
{
struct tcp_sock *tp = tcp_sk(sk);
- const struct inet_connection_sock *icsk = inet_csk(sk);
long m = mrtt; /* RTT */
/* The following amusing code comes from Jacobson's
@@ -610,9 +609,6 @@ static void tcp_rtt_estimator(struct sock *sk, const __u32 mrtt, u32 *usrtt)
tp->mdev_max = tp->rttvar = max(tp->mdev, TCP_RTO_MIN);
tp->rtt_seq = tp->snd_nxt;
}
-
- if (icsk->icsk_ca_ops->rtt_sample)
- icsk->icsk_ca_ops->rtt_sample(sk, *usrtt);
}
/* Calculate rto without backoff. This is the second half of Van Jacobson's
@@ -1921,7 +1917,7 @@ tcp_fastretrans_alert(struct sock *sk, u32 prior_snd_una,
/* Read draft-ietf-tcplw-high-performance before mucking
* with this code. (Superceeds RFC1323)
*/
-static void tcp_ack_saw_tstamp(struct sock *sk, u32 *usrtt, int flag)
+static void tcp_ack_saw_tstamp(struct sock *sk, int flag)
{
/* RTTM Rule: A TSecr value received in a segment is used to
* update the averaged RTT measurement only if the segment
@@ -1940,13 +1936,13 @@ static void tcp_ack_saw_tstamp(struct sock *sk, u32 *usrtt, int flag)
*/
struct tcp_sock *tp = tcp_sk(sk);
const __u32 seq_rtt = tcp_time_stamp - tp->rx_opt.rcv_tsecr;
- tcp_rtt_estimator(sk, seq_rtt, usrtt);
+ tcp_rtt_estimator(sk, seq_rtt);
tcp_set_rto(sk);
inet_csk(sk)->icsk_backoff = 0;
tcp_bound_rto(sk);
}
-static void tcp_ack_no_tstamp(struct sock *sk, u32 seq_rtt, u32 *usrtt, int flag)
+static void tcp_ack_no_tstamp(struct sock *sk, u32 seq_rtt, int flag)
{
/* We don't have a timestamp. Can only use
* packets that are not retransmitted to determine
@@ -1960,21 +1956,21 @@ static void tcp_ack_no_tstamp(struct sock *sk, u32 seq_rtt, u32 *usrtt, int flag
if (flag & FLAG_RETRANS_DATA_ACKED)
return;
- tcp_rtt_estimator(sk, seq_rtt, usrtt);
+ tcp_rtt_estimator(sk, seq_rtt);
tcp_set_rto(sk);
inet_csk(sk)->icsk_backoff = 0;
tcp_bound_rto(sk);
}
static inline void tcp_ack_update_rtt(struct sock *sk, const int flag,
- const s32 seq_rtt, u32 *usrtt)
+ const s32 seq_rtt)
{
const struct tcp_sock *tp = tcp_sk(sk);
/* Note that peer MAY send zero echo. In this case it is ignored. (rfc1323) */
if (tp->rx_opt.saw_tstamp && tp->rx_opt.rcv_tsecr)
- tcp_ack_saw_tstamp(sk, usrtt, flag);
+ tcp_ack_saw_tstamp(sk, flag);
else if (seq_rtt >= 0)
- tcp_ack_no_tstamp(sk, seq_rtt, usrtt, flag);
+ tcp_ack_no_tstamp(sk, seq_rtt, flag);
}
static inline void tcp_cong_avoid(struct sock *sk, u32 ack, u32 rtt,
@@ -2054,20 +2050,27 @@ static int tcp_tso_acked(struct sock *sk, struct sk_buff *skb,
return acked;
}
+static inline u32 tcp_usrtt(const struct sk_buff *skb)
+{
+ struct timeval tv, now;
+
+ do_gettimeofday(&now);
+ skb_get_timestamp(skb, &tv);
+ return (now.tv_sec - tv.tv_sec) * 1000000 + (now.tv_usec - tv.tv_usec);
+}
/* Remove acknowledged frames from the retransmission queue. */
-static int tcp_clean_rtx_queue(struct sock *sk, __s32 *seq_rtt_p, s32 *seq_usrtt)
+static int tcp_clean_rtx_queue(struct sock *sk, __s32 *seq_rtt_p)
{
struct tcp_sock *tp = tcp_sk(sk);
+ const struct inet_connection_sock *icsk = inet_csk(sk);
struct sk_buff *skb;
__u32 now = tcp_time_stamp;
int acked = 0;
__s32 seq_rtt = -1;
- struct timeval usnow;
u32 pkts_acked = 0;
-
- if (seq_usrtt)
- do_gettimeofday(&usnow);
+ void (*rtt_sample)(struct sock *sk, u32 usrtt)
+ = icsk->icsk_ca_ops->rtt_sample;
while ((skb = skb_peek(&sk->sk_write_queue)) &&
skb != sk->sk_send_head) {
@@ -2107,16 +2110,11 @@ static int tcp_clean_rtx_queue(struct sock *sk, __s32 *seq_rtt_p, s32 *seq_usrtt
tp->retrans_out -= tcp_skb_pcount(skb);
acked |= FLAG_RETRANS_DATA_ACKED;
seq_rtt = -1;
- } else if (seq_rtt < 0)
+ } else if (seq_rtt < 0) {
seq_rtt = now - scb->when;
- if (seq_usrtt) {
- struct timeval tv;
-
- skb_get_timestamp(skb, &tv);
- *seq_usrtt = (usnow.tv_sec - tv.tv_sec) * 1000000
- + (usnow.tv_usec - tv.tv_usec);
+ if (rtt_sample)
+ (*rtt_sample)(sk, tcp_usrtt(skb));
}
-
if (sacked & TCPCB_SACKED_ACKED)
tp->sacked_out -= tcp_skb_pcount(skb);
if (sacked & TCPCB_LOST)
@@ -2126,8 +2124,11 @@ static int tcp_clean_rtx_queue(struct sock *sk, __s32 *seq_rtt_p, s32 *seq_usrtt
!before(scb->end_seq, tp->snd_up))
tp->urg_mode = 0;
}
- } else if (seq_rtt < 0)
+ } else if (seq_rtt < 0) {
seq_rtt = now - scb->when;
+ if (rtt_sample)
+ (*rtt_sample)(sk, tcp_usrtt(skb));
+ }
tcp_dec_pcount_approx(&tp->fackets_out, skb);
tcp_packets_out_dec(tp, skb);
__skb_unlink(skb, &sk->sk_write_queue);
@@ -2135,8 +2136,7 @@ static int tcp_clean_rtx_queue(struct sock *sk, __s32 *seq_rtt_p, s32 *seq_usrtt
}
if (acked&FLAG_ACKED) {
- const struct inet_connection_sock *icsk = inet_csk(sk);
- tcp_ack_update_rtt(sk, acked, seq_rtt, seq_usrtt);
+ tcp_ack_update_rtt(sk, acked, seq_rtt);
tcp_ack_packets_out(sk, tp);
if (icsk->icsk_ca_ops->pkts_acked)
@@ -2299,7 +2299,6 @@ static int tcp_ack(struct sock *sk, struct sk_buff *skb, int flag)
u32 ack = TCP_SKB_CB(skb)->ack_seq;
u32 prior_in_flight;
s32 seq_rtt;
- s32 seq_usrtt = 0;
int prior_packets;
/* If the ack is newer than sent or older than previous acks
@@ -2352,8 +2351,7 @@ static int tcp_ack(struct sock *sk, struct sk_buff *skb, int flag)
prior_in_flight = tcp_packets_in_flight(tp);
/* See if we can take anything off of the retransmit queue. */
- flag |= tcp_clean_rtx_queue(sk, &seq_rtt,
- icsk->icsk_ca_ops->rtt_sample ? &seq_usrtt : NULL);
+ flag |= tcp_clean_rtx_queue(sk, &seq_rtt);
if (tp->frto_counter)
tcp_process_frto(sk, prior_snd_una);
@@ -4242,7 +4240,7 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
*/
if (tp->rx_opt.saw_tstamp && tp->rx_opt.rcv_tsecr &&
!tp->srtt)
- tcp_ack_saw_tstamp(sk, NULL, 0);
+ tcp_ack_saw_tstamp(sk, 0);
if (tp->rx_opt.tstamp_ok)
tp->advmss -= TCPOLEN_TSTAMP_ALIGNED;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.