Differential D26446 Diff 78051 head/sys/netinet/tcp_sack.c

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head/sys/netinet/tcp_sack.c

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	* necessary, a better scheme can be adopted at a later point, but for now,			* necessary, a better scheme can be adopted at a later point, but for now,
	* the goal is to prevent the sender from bursting a large amount of data in			* the goal is to prevent the sender from bursting a large amount of data in
	* the midst of sack recovery.			* the midst of sack recovery.
	*/			*/
	void			void
	tcp_sack_partialack(struct tcpcb tp, struct tcphdr th)			tcp_sack_partialack(struct tcpcb tp, struct tcphdr th)
	{			{
	int num_segs = 1;			int num_segs = 1;
				u_int maxseg = tcp_maxseg(tp);

	INP_WLOCK_ASSERT(tp->t_inpcb);			INP_WLOCK_ASSERT(tp->t_inpcb);
	tcp_timer_activate(tp, TT_REXMT, 0);			tcp_timer_activate(tp, TT_REXMT, 0);
	tp->t_rtttime = 0;			tp->t_rtttime = 0;
	/* Send one or 2 segments based on how much new data was acked. */			/* Send one or 2 segments based on how much new data was acked. */
	if ((BYTES_THIS_ACK(tp, th) / tp->t_maxseg) >= 2)			if ((BYTES_THIS_ACK(tp, th) / maxseg) >= 2)
	num_segs = 2;			num_segs = 2;
	tp->snd_cwnd = (tp->sackhint.sack_bytes_rexmit +			tp->snd_cwnd = (tp->sackhint.sack_bytes_rexmit +
	(tp->snd_nxt - tp->snd_recover) + num_segs * tp->t_maxseg);			(tp->snd_nxt - tp->snd_recover) + num_segs * maxseg);
	if (tp->snd_cwnd > tp->snd_ssthresh)			if (tp->snd_cwnd > tp->snd_ssthresh)
	tp->snd_cwnd = tp->snd_ssthresh;			tp->snd_cwnd = tp->snd_ssthresh;
	tp->t_flags \|= TF_ACKNOW;			tp->t_flags \|= TF_ACKNOW;
	(void) tp->t_fb->tfb_tcp_output(tp);			(void) tp->t_fb->tfb_tcp_output(tp);
	}			}

	#if 0			#if 0
	/*			/*
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