/*
* @westwood_update_window
* It updates RTT evaluation window if it is the right moment to do
* it. If so it calls filter for evaluating bandwidth.
*/
static void westwood_update_window(struct sock *sk)
{
struct westwood *w = inet_csk_ca(sk);
s32 delta = tcp_time_stamp - w->rtt_win_sx;
/* Initialize 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
* 50ms we don't filter but we continue 'building the sample'.
* This minimum limit was chosen since an estimation on small
* time intervals is better to avoid...
* Obviously on a LAN we reasonably will always have
* right_bound = left_bound + WESTWOOD_RTT_MIN
*/
if (w->rtt && delta > max_t(u32, w->rtt, TCP_WESTWOOD_RTT_MIN)) {
westwood_filter(w, delta);
w->bk = 0;
w->rtt_win_sx = tcp_time_stamp;
}
}
static void westwood_update_window(struct sock *sk)
{
struct westwood *w = inet_csk_ca(sk);
s32 delta = tcp_time_stamp - w->rtt_win_sx;
if (w->first_ack) {
w->snd_una = tcp_sk(sk)->snd_una;
w->first_ack = 0;
}
if (w->rtt && delta > max_t(u32, w->rtt, TCP_WESTWOOD_RTT_MIN)) {
westwood_filter(w, delta);
w->bk = 0;
w->rtt_win_sx = tcp_time_stamp;
}
}
