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/*
* Packet RX/TX history data structures and routines for TFRC-based protocols.
*
* Copyright (c) 2007 The University of Aberdeen, Scotland, UK
* Copyright (c) 2005-6 The University of Waikato, Hamilton, New Zealand.
*
* This code has been developed by the University of Waikato WAND
* research group. For further information please see http://www.wand.net.nz/
* or e-mail Ian McDonald - ian.mcdonald@jandi.co.nz
*
* This code also uses code from Lulea University, rereleased as GPL by its
* authors:
* Copyright (c) 2003 Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon
*
* Changes to meet Linux coding standards, to make it meet latest ccid3 draft
* and to make it work as a loadable module in the DCCP stack written by
* Arnaldo Carvalho de Melo <acme@conectiva.com.br>.
*
* Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef _DCCP_PKT_HIST_
#define _DCCP_PKT_HIST_
#include <linux/ktime.h>
#include <linux/list.h>
#include <linux/slab.h>
#include "../../dccp.h"
/* Number of later packets received before one is considered lost */
#define TFRC_RECV_NUM_LATE_LOSS 3
#define TFRC_WIN_COUNT_PER_RTT 4
#define TFRC_WIN_COUNT_LIMIT 16
/**
* tfrc_tx_hist_entry - Simple singly-linked TX history list
* @next: next oldest entry (LIFO order)
* @seqno: sequence number of this entry
* @stamp: send time of packet with sequence number @seqno
*/
struct tfrc_tx_hist_entry {
struct tfrc_tx_hist_entry *next;
u64 seqno;
ktime_t stamp;
};
extern int tfrc_tx_hist_add(struct tfrc_tx_hist_entry **headp, u64 seqno);
extern void tfrc_tx_hist_purge(struct tfrc_tx_hist_entry **headp);
extern struct tfrc_tx_hist_entry *
tfrc_tx_hist_find_entry(struct tfrc_tx_hist_entry *head, u64 ackno);
/*
* Receiver History data structures and declarations
*/
struct dccp_rx_hist_entry {
struct list_head dccphrx_node;
u64 dccphrx_seqno:48,
dccphrx_ccval:4,
dccphrx_type:4;
u32 dccphrx_ndp; /* In fact it is from 8 to 24 bits */
ktime_t dccphrx_tstamp;
};
struct dccp_rx_hist {
struct kmem_cache *dccprxh_slab;
};
extern struct dccp_rx_hist *dccp_rx_hist_new(const char *name);
extern void dccp_rx_hist_delete(struct dccp_rx_hist *hist);
static inline struct dccp_rx_hist_entry *
dccp_rx_hist_entry_new(struct dccp_rx_hist *hist,
const u32 ndp,
const struct sk_buff *skb,
const gfp_t prio)
{
struct dccp_rx_hist_entry *entry = kmem_cache_alloc(hist->dccprxh_slab,
prio);
if (entry != NULL) {
const struct dccp_hdr *dh = dccp_hdr(skb);
entry->dccphrx_seqno = DCCP_SKB_CB(skb)->dccpd_seq;
entry->dccphrx_ccval = dh->dccph_ccval;
entry->dccphrx_type = dh->dccph_type;
entry->dccphrx_ndp = ndp;
entry->dccphrx_tstamp = ktime_get_real();
}
return entry;
}
static inline struct dccp_rx_hist_entry *
dccp_rx_hist_head(struct list_head *list)
{
struct dccp_rx_hist_entry *head = NULL;
if (!list_empty(list))
head = list_entry(list->next, struct dccp_rx_hist_entry,
dccphrx_node);
return head;
}
extern int dccp_rx_hist_find_entry(const struct list_head *list, const u64 seq,
u8 *ccval);
extern struct dccp_rx_hist_entry *
dccp_rx_hist_find_data_packet(const struct list_head *list);
extern void dccp_rx_hist_add_packet(struct dccp_rx_hist *hist,
struct list_head *rx_list,
struct list_head *li_list,
struct dccp_rx_hist_entry *packet,
u64 nonloss_seqno);
static inline void dccp_rx_hist_entry_delete(struct dccp_rx_hist *hist,
struct dccp_rx_hist_entry *entry)
{
if (entry != NULL)
kmem_cache_free(hist->dccprxh_slab, entry);
}
extern void dccp_rx_hist_purge(struct dccp_rx_hist *hist,
struct list_head *list);
static inline int
dccp_rx_hist_entry_data_packet(const struct dccp_rx_hist_entry *entry)
{
return entry->dccphrx_type == DCCP_PKT_DATA ||
entry->dccphrx_type == DCCP_PKT_DATAACK;
}
extern u64 dccp_rx_hist_detect_loss(struct list_head *rx_list,
struct list_head *li_list, u8 *win_loss);
#endif /* _DCCP_PKT_HIST_ */
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