net/mac80211/ieee80211_rate.h

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005, Devicescape Software, Inc.
   4  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #ifndef IEEE80211_RATE_H
  12 #define IEEE80211_RATE_H
  13
  14 #include <linux/netdevice.h>
  15 #include <linux/skbuff.h>
  16 #include <linux/types.h>
  17 #include <net/mac80211.h>
  18 #include "ieee80211_i.h"
  19 #include "sta_info.h"
  20
  21 struct rate_selection {
  22         /* Selected transmission rate */
  23         struct ieee80211_rate *rate;
  24         /* Non-ERP rate to use if mac80211 decides it cannot use an ERP rate */
  25         struct ieee80211_rate *nonerp;
  26         /* probe with this rate, or NULL for no probing */
  27         struct ieee80211_rate *probe;
  28 };
  29
  30 struct rate_control_ops {
  31         struct module *module;
  32         const char *name;
  33         void (*tx_status)(void *priv, struct net_device *dev,
  34                           struct sk_buff *skb,
  35                           struct ieee80211_tx_status *status);
  36         void (*get_rate)(void *priv, struct net_device *dev,
  37                          struct ieee80211_hw_mode *mode, struct sk_buff *skb,
  38                          struct rate_selection *sel);
  39         void (*rate_init)(void *priv, void *priv_sta,
  40                           struct ieee80211_local *local, struct sta_info *sta);
  41         void (*clear)(void *priv);
  42
  43         void *(*alloc)(struct ieee80211_local *local);
  44         void (*free)(void *priv);
  45         void *(*alloc_sta)(void *priv, gfp_t gfp);
  46         void (*free_sta)(void *priv, void *priv_sta);
  47
  48         int (*add_attrs)(void *priv, struct kobject *kobj);
  49         void (*remove_attrs)(void *priv, struct kobject *kobj);
  50         void (*add_sta_debugfs)(void *priv, void *priv_sta,
  51                                 struct dentry *dir);
  52         void (*remove_sta_debugfs)(void *priv, void *priv_sta);
  53 };
  54
  55 struct rate_control_ref {
  56         struct rate_control_ops *ops;
  57         void *priv;
  58         struct kref kref;
  59 };
  60
  61 int ieee80211_rate_control_register(struct rate_control_ops *ops);
  62 void ieee80211_rate_control_unregister(struct rate_control_ops *ops);
  63
  64 /* Get a reference to the rate control algorithm. If `name' is NULL, get the
  65  * first available algorithm. */
  66 struct rate_control_ref *rate_control_alloc(const char *name,
  67                                             struct ieee80211_local *local);
  68 void rate_control_get_rate(struct net_device *dev,
  69                            struct ieee80211_hw_mode *mode, struct sk_buff *skb,
  70                            struct rate_selection *sel);
  71 struct rate_control_ref *rate_control_get(struct rate_control_ref *ref);
  72 void rate_control_put(struct rate_control_ref *ref);
  73
  74 static inline void rate_control_tx_status(struct net_device *dev,
  75                                           struct sk_buff *skb,
  76                                           struct ieee80211_tx_status *status)
  77 {
  78         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
  79         struct rate_control_ref *ref = local->rate_ctrl;
  80
  81         ref->ops->tx_status(ref->priv, dev, skb, status);
  82 }
  83
  84
  85 static inline void rate_control_rate_init(struct sta_info *sta,
  86                                           struct ieee80211_local *local)
  87 {
  88         struct rate_control_ref *ref = sta->rate_ctrl;
  89         ref->ops->rate_init(ref->priv, sta->rate_ctrl_priv, local, sta);
  90 }
  91
  92
  93 static inline void rate_control_clear(struct ieee80211_local *local)
  94 {
  95         struct rate_control_ref *ref = local->rate_ctrl;
  96         ref->ops->clear(ref->priv);
  97 }
  98
  99 static inline void *rate_control_alloc_sta(struct rate_control_ref *ref,
 100                                            gfp_t gfp)
 101 {
 102         return ref->ops->alloc_sta(ref->priv, gfp);
 103 }
 104
 105 static inline void rate_control_free_sta(struct rate_control_ref *ref,
 106                                          void *priv)
 107 {
 108         ref->ops->free_sta(ref->priv, priv);
 109 }
 110
 111 static inline void rate_control_add_sta_debugfs(struct sta_info *sta)
 112 {
 113 #ifdef CONFIG_MAC80211_DEBUGFS
 114         struct rate_control_ref *ref = sta->rate_ctrl;
 115         if (sta->debugfs.dir && ref->ops->add_sta_debugfs)
 116                 ref->ops->add_sta_debugfs(ref->priv, sta->rate_ctrl_priv,
 117                                           sta->debugfs.dir);
 118 #endif
 119 }
 120
 121 static inline void rate_control_remove_sta_debugfs(struct sta_info *sta)
 122 {
 123 #ifdef CONFIG_MAC80211_DEBUGFS
 124         struct rate_control_ref *ref = sta->rate_ctrl;
 125         if (ref->ops->remove_sta_debugfs)
 126                 ref->ops->remove_sta_debugfs(ref->priv, sta->rate_ctrl_priv);
 127 #endif
 128 }
 129
 130 static inline int
 131 rate_supported(struct sta_info *sta, struct ieee80211_hw_mode *mode, int index)
 132 {
 133         return (sta == NULL || sta->supp_rates & BIT(index)) &&
 134                (mode->rates[index].flags & IEEE80211_RATE_SUPPORTED);
 135 }
 136
 137 static inline int
 138 rate_lowest_index(struct ieee80211_local *local, struct ieee80211_hw_mode *mode,
 139                   struct sta_info *sta)
 140 {
 141         int i;
 142
 143         for (i = 0; i < mode->num_rates; i++) {
 144                 if (rate_supported(sta, mode, i))
 145                         return i;
 146         }
 147
 148         /* warn when we cannot find a rate. */
 149         WARN_ON(1);
 150
 151         return 0;
 152 }
 153
 154 static inline struct ieee80211_rate *
 155 rate_lowest(struct ieee80211_local *local, struct ieee80211_hw_mode *mode,
 156             struct sta_info *sta)
 157 {
 158         return &mode->rates[rate_lowest_index(local, mode, sta)];
 159 }
 160
 161
 162 /* functions for rate control related to a device */
 163 int ieee80211_init_rate_ctrl_alg(struct ieee80211_local *local,
 164                                  const char *name);
 165 void rate_control_deinitialize(struct ieee80211_local *local);
 166
 167
 168 /* Rate control algorithms */
 169 #if defined(RC80211_SIMPLE_COMPILE) || \
 170         (defined(CONFIG_MAC80211_RC_SIMPLE) && \
 171          !defined(CONFIG_MAC80211_RC_SIMPLE_MODULE))
 172 extern int rc80211_simple_init(void);
 173 extern void rc80211_simple_exit(void);
 174 #else
 175 static inline int rc80211_simple_init(void)
 176 {
 177         return 0;
 178 }
 179 static inline void rc80211_simple_exit(void)
 180 {
 181 }
 182 #endif
 183
 184 #if defined(RC80211_PID_COMPILE) || \
 185         (defined(CONFIG_MAC80211_RC_PID) && \
 186          !defined(CONFIG_MAC80211_RC_PID_MODULE))
 187 extern int rc80211_pid_init(void);
 188 extern void rc80211_pid_exit(void);
 189 #else
 190 static inline int rc80211_pid_init(void)
 191 {
 192         return 0;
 193 }
 194 static inline void rc80211_pid_exit(void)
 195 {
 196 }
 197 #endif
 198
 199 #endif /* IEEE80211_RATE_H */