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This patch changes the API for the callback that is done after an ACK is
received. It solves a couple of issues:
* Some congestion controls want higher resolution value of RTT
(controlled by TCP_CONG_RTT_SAMPLE flag). These don't really want a ktime, but
all compute a RTT in microseconds.
* Other congestion control could use RTT at jiffies resolution.
To keep API consistent the units should be the same for both cases, just the
resolution should change.
Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
25 lines
902 B
C
25 lines
902 B
C
/*
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* TCP Vegas congestion control interface
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*/
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#ifndef __TCP_VEGAS_H
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#define __TCP_VEGAS_H 1
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/* Vegas variables */
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struct vegas {
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u32 beg_snd_nxt; /* right edge during last RTT */
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u32 beg_snd_una; /* left edge during last RTT */
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u32 beg_snd_cwnd; /* saves the size of the cwnd */
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u8 doing_vegas_now;/* if true, do vegas for this RTT */
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u16 cntRTT; /* # of RTTs measured within last RTT */
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u32 minRTT; /* min of RTTs measured within last RTT (in usec) */
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u32 baseRTT; /* the min of all Vegas RTT measurements seen (in usec) */
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};
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extern void tcp_vegas_init(struct sock *sk);
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extern void tcp_vegas_state(struct sock *sk, u8 ca_state);
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extern void tcp_vegas_pkts_acked(struct sock *sk, u32 cnt, s32 rtt_us);
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extern void tcp_vegas_cwnd_event(struct sock *sk, enum tcp_ca_event event);
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extern void tcp_vegas_get_info(struct sock *sk, u32 ext, struct sk_buff *skb);
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#endif /* __TCP_VEGAS_H */
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