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[TCP] Westwood: fix first sample 

Need to update send sequence number tracking after first ack.
Rework of patch from Luca De Cicco.

Signed-off-by: Stephen Hemminger <shemminger@dxpl.pdx.osdl.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Hemminger 2006-06-11 23:01:02 -07:00 committed by David S. Miller
parent bdeb04c6d9
commit f61e29018a
1 changed files with 12 additions and 1 deletions
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13
net/ipv4/tcp_westwood.c
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@ -22,6 +22,7 @@ struct westwood {
u32 accounted;
u32 rtt;
u32 rtt_min; /* minimum observed RTT */
u8 first_ack; /* flag which infers that this is the first ack */
};
@ -52,6 +53,7 @@ static void tcp_westwood_init(struct sock *sk)
w->rtt_min = w->rtt = TCP_WESTWOOD_INIT_RTT;
w->rtt_win_sx = tcp_time_stamp;
w->snd_una = tcp_sk(sk)->snd_una;
w->first_ack = 1;
}
/*
@ -91,6 +93,15 @@ static void westwood_update_window(struct sock *sk)
struct westwood *w = inet_csk_ca(sk);
s32 delta = tcp_time_stamp - w->rtt_win_sx;
/* Initialise w->snd_una with the first acked sequence number in order
* to fix mismatch between tp->snd_una and w->snd_una for the first
* bandwidth sample
*/
if (w->first_ack) {
w->snd_una = tcp_sk(sk)->snd_una;
w->first_ack = 0;
}
/*
* See if a RTT-window has passed.
* Be careful since if RTT is less than
@ -180,7 +191,7 @@ static void tcp_westwood_event(struct sock *sk, enum tcp_ca_event event)
{
struct tcp_sock *tp = tcp_sk(sk);
struct westwood *w = inet_csk_ca(sk);
switch(event) {
case CA_EVENT_FAST_ACK:
westwood_fast_bw(sk);