76 строки
2.2 KiB
C
76 строки
2.2 KiB
C
#ifndef _DCCP_LI_HIST_
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#define _DCCP_LI_HIST_
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/*
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* net/dccp/ccids/lib/loss_interval.h
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*
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* Copyright (c) 2007 The University of Aberdeen, Scotland, UK
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* Copyright (c) 2005-7 The University of Waikato, Hamilton, New Zealand.
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* Copyright (c) 2005-7 Ian McDonald <ian.mcdonald@jandi.co.nz>
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* Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*/
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#include <linux/ktime.h>
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#include <linux/list.h>
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#include <linux/slab.h>
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/*
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* Number of loss intervals (RFC 4342, 8.6.1). The history size is one more than
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* NINTERVAL, since the `open' interval I_0 is always stored as the first entry.
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*/
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#define NINTERVAL 8
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#define LIH_SIZE (NINTERVAL + 1)
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/**
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* tfrc_loss_interval - Loss history record for TFRC-based protocols
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* @li_seqno: Highest received seqno before the start of loss
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* @li_ccval: The CCVal belonging to @li_seqno
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* @li_is_closed: Whether @li_seqno is older than 1 RTT
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* @li_length: Loss interval sequence length
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*/
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struct tfrc_loss_interval {
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u64 li_seqno:48,
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li_ccval:4,
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li_is_closed:1;
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u32 li_length;
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};
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/**
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* tfrc_loss_hist - Loss record database
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* @ring: Circular queue managed in LIFO manner
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* @counter: Current count of entries (can be more than %LIH_SIZE)
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* @i_mean: Current Average Loss Interval [RFC 3448, 5.4]
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*/
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struct tfrc_loss_hist {
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struct tfrc_loss_interval *ring[LIH_SIZE];
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u8 counter;
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u32 i_mean;
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};
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static inline void tfrc_lh_init(struct tfrc_loss_hist *lh)
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{
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memset(lh, 0, sizeof(struct tfrc_loss_hist));
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}
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static inline u8 tfrc_lh_is_initialised(struct tfrc_loss_hist *lh)
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{
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return lh->counter > 0;
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}
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static inline u8 tfrc_lh_length(struct tfrc_loss_hist *lh)
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{
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return min(lh->counter, (u8)LIH_SIZE);
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}
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struct tfrc_rx_hist;
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extern int tfrc_lh_interval_add(struct tfrc_loss_hist *, struct tfrc_rx_hist *,
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u32 (*first_li)(struct sock *), struct sock *);
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extern u8 tfrc_lh_update_i_mean(struct tfrc_loss_hist *lh, struct sk_buff *);
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extern void tfrc_lh_cleanup(struct tfrc_loss_hist *lh);
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#endif /* _DCCP_LI_HIST_ */
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