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Commit f61e2901 authored by Stephen Hemminger's avatar Stephen Hemminger Committed by David S. Miller
Browse files

[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: default avatarStephen Hemminger <shemminger@dxpl.pdx.osdl.net>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent bdeb04c6

net/ipv4/tcp_westwood.c

+12 −1
Original line number Diff line number Diff line
@@ -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