/* SPDX-License-Identifier: GPL-2.0-or-later */
|
#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 <ian.mcdonald@jandi.co.nz>
|
* Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
|
*/
|
#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)
|
|
/**
|
* tfrc_loss_interval - Loss history record for TFRC-based protocols
|
* @li_seqno: Highest received seqno before the start of loss
|
* @li_ccval: The CCVal belonging to @li_seqno
|
* @li_is_closed: Whether @li_seqno is older than 1 RTT
|
* @li_length: Loss interval sequence length
|
*/
|
struct tfrc_loss_interval {
|
u64 li_seqno:48,
|
li_ccval:4,
|
li_is_closed:1;
|
u32 li_length;
|
};
|
|
/**
|
* tfrc_loss_hist - Loss record database
|
* @ring: Circular queue managed in LIFO manner
|
* @counter: Current count of entries (can be more than %LIH_SIZE)
|
* @i_mean: Current Average Loss Interval [RFC 3448, 5.4]
|
*/
|
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;
|
|
int tfrc_lh_interval_add(struct tfrc_loss_hist *, struct tfrc_rx_hist *,
|
u32 (*first_li)(struct sock *), struct sock *);
|
u8 tfrc_lh_update_i_mean(struct tfrc_loss_hist *lh, struct sk_buff *);
|
void tfrc_lh_cleanup(struct tfrc_loss_hist *lh);
|
|
#endif /* _DCCP_LI_HIST_ */
|
