loss_interval.h

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#ifndef _DCCP_LI_HIST_
#define _DCCP_LI_HIST_
/*
 *  Copyright (c) 2007   The University of Aberdeen, Scotland, UK
 *  Copyright (c) 2005-7 The University of Waikato, Hamilton, New Zealand.
 *  Copyright (c) 2005-7 Ian McDonald <[email protected]>
 *  Copyright (c) 2005 Arnaldo Carvalho de Melo <[email protected]>
 *
 *  This program is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU General Public License as published by the Free
 *  Software Foundation; either version 2 of the License, or (at your option)
 *  any later version.
 */
#include <linux/ktime.h>
#include <linux/list.h>
#include <linux/slab.h>

/*
 * Number of loss intervals (RFC 4342, 8.6.1). The history size is one more than
 * NINTERVAL, since the `open' interval I_0 is always stored as the first entry.
 */
#define NINTERVAL   8
#define LIH_SIZE    (NINTERVAL + 1)

struct tfrc_loss_interval {
    u64      li_seqno:48,
             li_ccval:4,
             li_is_closed:1;
    u32      li_length;
};

struct tfrc_loss_hist {
    struct tfrc_loss_interval   *ring[LIH_SIZE];
    u8              counter;
    u32             i_mean;
};

static inline void tfrc_lh_init(struct tfrc_loss_hist *lh)
{
    memset(lh, 0, sizeof(struct tfrc_loss_hist));
}

static inline u8 tfrc_lh_is_initialised(struct tfrc_loss_hist *lh)
{
    return lh->counter > 0;
}

static inline u8 tfrc_lh_length(struct tfrc_loss_hist *lh)
{
    return min(lh->counter, (u8)LIH_SIZE);
}

struct tfrc_rx_hist;

extern int  tfrc_lh_interval_add(struct tfrc_loss_hist *, struct tfrc_rx_hist *,
                 u32 (*first_li)(struct sock *), struct sock *);
extern u8   tfrc_lh_update_i_mean(struct tfrc_loss_hist *lh, struct sk_buff *);
extern void tfrc_lh_cleanup(struct tfrc_loss_hist *lh);

#endif /* _DCCP_LI_HIST_ */