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 <iam4@cs.waikato.ac.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/config.h>
  17 #include <linux/list.h>
  18 #include <linux/slab.h>
  19 #include <linux/time.h>
  20
  21 #define DCCP_LI_HIST_IVAL_F_LENGTH  8
  22
  23 struct dccp_li_hist {
  24         kmem_cache_t *dccplih_slab;
  25 };
  26
  27 extern struct dccp_li_hist *dccp_li_hist_new(const char *name);
  28 extern void dccp_li_hist_delete(struct dccp_li_hist *hist);
  29
  30 struct dccp_li_hist_entry {
  31         struct list_head dccplih_node;
  32         u64              dccplih_seqno:48,
  33                          dccplih_win_count:4;
  34         u32              dccplih_interval;
  35 };
  36
  37 static inline struct dccp_li_hist_entry *
  38                 dccp_li_hist_entry_new(struct dccp_li_hist *hist,
  39                                        const gfp_t prio)
  40 {
  41         return kmem_cache_alloc(hist->dccplih_slab, prio);
  42 }
  43
  44 static inline void dccp_li_hist_entry_delete(struct dccp_li_hist *hist,
  45                                              struct dccp_li_hist_entry *entry)
  46 {
  47         if (entry != NULL)
  48                 kmem_cache_free(hist->dccplih_slab, entry);
  49 }
  50
  51 extern void dccp_li_hist_purge(struct dccp_li_hist *hist,
  52                                struct list_head *list);
  53
  54 extern u32 dccp_li_hist_calc_i_mean(struct list_head *list);
  55
  56 extern struct dccp_li_hist_entry *
  57                         dccp_li_hist_interval_new(struct dccp_li_hist *hist,
  58                                                   struct list_head *list,
  59                                                   const u64 seq_loss,
  60                                                   const u8 win_loss);
  61 #endif /* _DCCP_LI_HIST_ */