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f0706e82 JB |
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 | ||
1abbe498 MN |
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 */ | |
f0706e82 | 25 | struct ieee80211_rate *nonerp; |
1abbe498 MN |
26 | /* probe with this rate, or NULL for no probing */ |
27 | struct ieee80211_rate *probe; | |
f0706e82 JB |
28 | }; |
29 | ||
f0706e82 JB |
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); | |
1abbe498 MN |
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); | |
f0706e82 JB |
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); | |
e9f207f0 JB |
50 | void (*add_sta_debugfs)(void *priv, void *priv_sta, |
51 | struct dentry *dir); | |
52 | void (*remove_sta_debugfs)(void *priv, void *priv_sta); | |
f0706e82 JB |
53 | }; |
54 | ||
55 | struct rate_control_ref { | |
56 | struct rate_control_ops *ops; | |
57 | void *priv; | |
58 | struct kref kref; | |
59 | }; | |
60 | ||
ac71c691 JB |
61 | /* default 'simple' algorithm */ |
62 | extern struct rate_control_ops mac80211_rcsimple; | |
63 | ||
f0706e82 JB |
64 | int ieee80211_rate_control_register(struct rate_control_ops *ops); |
65 | void ieee80211_rate_control_unregister(struct rate_control_ops *ops); | |
66 | ||
67 | /* Get a reference to the rate control algorithm. If `name' is NULL, get the | |
68 | * first available algorithm. */ | |
69 | struct rate_control_ref *rate_control_alloc(const char *name, | |
70 | struct ieee80211_local *local); | |
1abbe498 MN |
71 | void rate_control_get_rate(struct net_device *dev, |
72 | struct ieee80211_hw_mode *mode, struct sk_buff *skb, | |
73 | struct rate_selection *sel); | |
f0706e82 JB |
74 | struct rate_control_ref *rate_control_get(struct rate_control_ref *ref); |
75 | void rate_control_put(struct rate_control_ref *ref); | |
76 | ||
1abbe498 | 77 | static inline void rate_control_tx_status(struct net_device *dev, |
f0706e82 JB |
78 | struct sk_buff *skb, |
79 | struct ieee80211_tx_status *status) | |
80 | { | |
1abbe498 | 81 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); |
f0706e82 | 82 | struct rate_control_ref *ref = local->rate_ctrl; |
f0706e82 | 83 | |
1abbe498 | 84 | ref->ops->tx_status(ref->priv, dev, skb, status); |
f0706e82 JB |
85 | } |
86 | ||
87 | ||
88 | static inline void rate_control_rate_init(struct sta_info *sta, | |
89 | struct ieee80211_local *local) | |
90 | { | |
91 | struct rate_control_ref *ref = sta->rate_ctrl; | |
92 | ref->ops->rate_init(ref->priv, sta->rate_ctrl_priv, local, sta); | |
93 | } | |
94 | ||
95 | ||
96 | static inline void rate_control_clear(struct ieee80211_local *local) | |
97 | { | |
98 | struct rate_control_ref *ref = local->rate_ctrl; | |
99 | ref->ops->clear(ref->priv); | |
100 | } | |
101 | ||
102 | static inline void *rate_control_alloc_sta(struct rate_control_ref *ref, | |
103 | gfp_t gfp) | |
104 | { | |
105 | return ref->ops->alloc_sta(ref->priv, gfp); | |
106 | } | |
107 | ||
108 | static inline void rate_control_free_sta(struct rate_control_ref *ref, | |
109 | void *priv) | |
110 | { | |
111 | ref->ops->free_sta(ref->priv, priv); | |
112 | } | |
113 | ||
e9f207f0 JB |
114 | static inline void rate_control_add_sta_debugfs(struct sta_info *sta) |
115 | { | |
116 | #ifdef CONFIG_MAC80211_DEBUGFS | |
117 | struct rate_control_ref *ref = sta->rate_ctrl; | |
118 | if (sta->debugfs.dir && ref->ops->add_sta_debugfs) | |
119 | ref->ops->add_sta_debugfs(ref->priv, sta->rate_ctrl_priv, | |
120 | sta->debugfs.dir); | |
121 | #endif | |
122 | } | |
123 | ||
124 | static inline void rate_control_remove_sta_debugfs(struct sta_info *sta) | |
125 | { | |
126 | #ifdef CONFIG_MAC80211_DEBUGFS | |
127 | struct rate_control_ref *ref = sta->rate_ctrl; | |
128 | if (ref->ops->remove_sta_debugfs) | |
129 | ref->ops->remove_sta_debugfs(ref->priv, sta->rate_ctrl_priv); | |
130 | #endif | |
131 | } | |
132 | ||
1abbe498 MN |
133 | static inline int |
134 | rate_supported(struct sta_info *sta, struct ieee80211_hw_mode *mode, int index) | |
135 | { | |
136 | return (sta == NULL || sta->supp_rates & BIT(index)) && | |
137 | (mode->rates[index].flags & IEEE80211_RATE_SUPPORTED); | |
138 | } | |
139 | ||
140 | static inline int | |
141 | rate_lowest_index(struct ieee80211_local *local, struct ieee80211_hw_mode *mode, | |
142 | struct sta_info *sta) | |
143 | { | |
144 | int i; | |
145 | ||
146 | for (i = 0; i < mode->num_rates; i++) { | |
147 | if (rate_supported(sta, mode, i)) | |
148 | return i; | |
149 | } | |
150 | ||
151 | /* warn when we cannot find a rate. */ | |
152 | WARN_ON(1); | |
153 | ||
154 | return 0; | |
155 | } | |
156 | ||
157 | static inline struct ieee80211_rate * | |
158 | rate_lowest(struct ieee80211_local *local, struct ieee80211_hw_mode *mode, | |
159 | struct sta_info *sta) | |
160 | { | |
161 | return &mode->rates[rate_lowest_index(local, mode, sta)]; | |
162 | } | |
163 | ||
ff688089 JB |
164 | |
165 | /* functions for rate control related to a device */ | |
166 | int ieee80211_init_rate_ctrl_alg(struct ieee80211_local *local, | |
167 | const char *name); | |
168 | void rate_control_deinitialize(struct ieee80211_local *local); | |
169 | ||
f0706e82 | 170 | #endif /* IEEE80211_RATE_H */ |