0ae85f0340b28f58e3a0b3cfb7ef777d608ce298
[linux-3.10.git] / net / dccp / ccids / lib / loss_interval.h
1 #ifndef _DCCP_LI_HIST_
2 #define _DCCP_LI_HIST_
3 /*
4  *  net/dccp/ccids/lib/loss_interval.h
5  *
6  *  Copyright (c) 2005 The University of Waikato, Hamilton, New Zealand.
7  *  Copyright (c) 2005 Ian McDonald <ian.mcdonald@jandi.co.nz>
8  *  Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
9  *
10  *  This program is free software; you can redistribute it and/or modify it
11  *  under the terms of the GNU General Public License as published by the Free
12  *  Software Foundation; either version 2 of the License, or (at your option)
13  *  any later version.
14  */
15
16 #include <linux/list.h>
17 #include <linux/slab.h>
18 #include <linux/time.h>
19
20 #define DCCP_LI_HIST_IVAL_F_LENGTH  8
21
22 struct dccp_li_hist {
23         kmem_cache_t *dccplih_slab;
24 };
25
26 extern struct dccp_li_hist *dccp_li_hist_new(const char *name);
27 extern void dccp_li_hist_delete(struct dccp_li_hist *hist);
28
29 struct dccp_li_hist_entry {
30         struct list_head dccplih_node;
31         u64              dccplih_seqno:48,
32                          dccplih_win_count:4;
33         u32              dccplih_interval;
34 };
35
36 static inline struct dccp_li_hist_entry *
37                 dccp_li_hist_entry_new(struct dccp_li_hist *hist,
38                                        const gfp_t prio)
39 {
40         return kmem_cache_alloc(hist->dccplih_slab, prio);
41 }
42
43 static inline void dccp_li_hist_entry_delete(struct dccp_li_hist *hist,
44                                              struct dccp_li_hist_entry *entry)
45 {
46         if (entry != NULL)
47                 kmem_cache_free(hist->dccplih_slab, entry);
48 }
49
50 extern void dccp_li_hist_purge(struct dccp_li_hist *hist,
51                                struct list_head *list);
52
53 extern u32 dccp_li_hist_calc_i_mean(struct list_head *list);
54
55 extern int dccp_li_hist_interval_new(struct dccp_li_hist *hist,
56    struct list_head *list, const u64 seq_loss, const u8 win_loss);
57 #endif /* _DCCP_LI_HIST_ */