2 * Packet RX/TX history data structures and routines for TFRC-based protocols.
4 * Copyright (c) 2007 The University of Aberdeen, Scotland, UK
5 * Copyright (c) 2005-6 The University of Waikato, Hamilton, New Zealand.
7 * This code has been developed by the University of Waikato WAND
8 * research group. For further information please see http://www.wand.net.nz/
9 * or e-mail Ian McDonald - ian.mcdonald@jandi.co.nz
11 * This code also uses code from Lulea University, rereleased as GPL by its
13 * Copyright (c) 2003 Nils-Erik Mattsson, Joacim Haggmark, Magnus Erixzon
15 * Changes to meet Linux coding standards, to make it meet latest ccid3 draft
16 * and to make it work as a loadable module in the DCCP stack written by
17 * Arnaldo Carvalho de Melo <acme@conectiva.com.br>.
19 * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
21 * This program is free software; you can redistribute it and/or modify
22 * it under the terms of the GNU General Public License as published by
23 * the Free Software Foundation; either version 2 of the License, or
24 * (at your option) any later version.
26 * This program is distributed in the hope that it will be useful,
27 * but WITHOUT ANY WARRANTY; without even the implied warranty of
28 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
29 * GNU General Public License for more details.
31 * You should have received a copy of the GNU General Public License
32 * along with this program; if not, write to the Free Software
33 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
36 #ifndef _DCCP_PKT_HIST_
37 #define _DCCP_PKT_HIST_
39 #include <linux/ktime.h>
40 #include <linux/list.h>
41 #include <linux/slab.h>
43 #include "../../dccp.h"
45 /* Number of later packets received before one is considered lost */
46 #define TFRC_RECV_NUM_LATE_LOSS 3
48 #define TFRC_WIN_COUNT_PER_RTT 4
49 #define TFRC_WIN_COUNT_LIMIT 16
51 struct tfrc_tx_hist_entry;
53 extern int tfrc_tx_hist_add(struct tfrc_tx_hist_entry **headp, u64 seqno);
54 extern void tfrc_tx_hist_purge(struct tfrc_tx_hist_entry **headp);
55 extern u32 tfrc_tx_hist_rtt(struct tfrc_tx_hist_entry *head,
56 const u64 seqno, const ktime_t now);
59 * Receiver History data structures and declarations
61 struct dccp_rx_hist_entry {
62 struct list_head dccphrx_node;
66 u32 dccphrx_ndp; /* In fact it is from 8 to 24 bits */
67 ktime_t dccphrx_tstamp;
71 struct kmem_cache *dccprxh_slab;
74 extern struct dccp_rx_hist *dccp_rx_hist_new(const char *name);
75 extern void dccp_rx_hist_delete(struct dccp_rx_hist *hist);
77 static inline struct dccp_rx_hist_entry *
78 dccp_rx_hist_entry_new(struct dccp_rx_hist *hist,
80 const struct sk_buff *skb,
83 struct dccp_rx_hist_entry *entry = kmem_cache_alloc(hist->dccprxh_slab,
87 const struct dccp_hdr *dh = dccp_hdr(skb);
89 entry->dccphrx_seqno = DCCP_SKB_CB(skb)->dccpd_seq;
90 entry->dccphrx_ccval = dh->dccph_ccval;
91 entry->dccphrx_type = dh->dccph_type;
92 entry->dccphrx_ndp = ndp;
93 entry->dccphrx_tstamp = ktime_get_real();
99 static inline struct dccp_rx_hist_entry *
100 dccp_rx_hist_head(struct list_head *list)
102 struct dccp_rx_hist_entry *head = NULL;
104 if (!list_empty(list))
105 head = list_entry(list->next, struct dccp_rx_hist_entry,
110 extern int dccp_rx_hist_find_entry(const struct list_head *list, const u64 seq,
112 extern struct dccp_rx_hist_entry *
113 dccp_rx_hist_find_data_packet(const struct list_head *list);
115 extern void dccp_rx_hist_add_packet(struct dccp_rx_hist *hist,
116 struct list_head *rx_list,
117 struct list_head *li_list,
118 struct dccp_rx_hist_entry *packet,
121 static inline void dccp_rx_hist_entry_delete(struct dccp_rx_hist *hist,
122 struct dccp_rx_hist_entry *entry)
125 kmem_cache_free(hist->dccprxh_slab, entry);
128 extern void dccp_rx_hist_purge(struct dccp_rx_hist *hist,
129 struct list_head *list);
132 dccp_rx_hist_entry_data_packet(const struct dccp_rx_hist_entry *entry)
134 return entry->dccphrx_type == DCCP_PKT_DATA ||
135 entry->dccphrx_type == DCCP_PKT_DATAACK;
138 extern u64 dccp_rx_hist_detect_loss(struct list_head *rx_list,
139 struct list_head *li_list, u8 *win_loss);
141 #endif /* _DCCP_PKT_HIST_ */