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f0706e82 JB |
1 | /* |
2 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
3 | * Copyright 2005-2006, 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 | #include <linux/kernel.h> | |
12 | #include "ieee80211_rate.h" | |
13 | #include "ieee80211_i.h" | |
14 | ||
15 | struct rate_control_alg { | |
16 | struct list_head list; | |
17 | struct rate_control_ops *ops; | |
18 | }; | |
19 | ||
20 | static LIST_HEAD(rate_ctrl_algs); | |
21 | static DEFINE_MUTEX(rate_ctrl_mutex); | |
22 | ||
23 | int ieee80211_rate_control_register(struct rate_control_ops *ops) | |
24 | { | |
25 | struct rate_control_alg *alg; | |
26 | ||
dd00cc48 | 27 | alg = kzalloc(sizeof(*alg), GFP_KERNEL); |
f0706e82 JB |
28 | if (alg == NULL) { |
29 | return -ENOMEM; | |
30 | } | |
f0706e82 JB |
31 | alg->ops = ops; |
32 | ||
33 | mutex_lock(&rate_ctrl_mutex); | |
34 | list_add_tail(&alg->list, &rate_ctrl_algs); | |
35 | mutex_unlock(&rate_ctrl_mutex); | |
36 | ||
37 | return 0; | |
38 | } | |
39 | EXPORT_SYMBOL(ieee80211_rate_control_register); | |
40 | ||
41 | void ieee80211_rate_control_unregister(struct rate_control_ops *ops) | |
42 | { | |
43 | struct rate_control_alg *alg; | |
44 | ||
45 | mutex_lock(&rate_ctrl_mutex); | |
46 | list_for_each_entry(alg, &rate_ctrl_algs, list) { | |
47 | if (alg->ops == ops) { | |
48 | list_del(&alg->list); | |
49 | break; | |
50 | } | |
51 | } | |
52 | mutex_unlock(&rate_ctrl_mutex); | |
53 | kfree(alg); | |
54 | } | |
55 | EXPORT_SYMBOL(ieee80211_rate_control_unregister); | |
56 | ||
57 | static struct rate_control_ops * | |
58 | ieee80211_try_rate_control_ops_get(const char *name) | |
59 | { | |
60 | struct rate_control_alg *alg; | |
61 | struct rate_control_ops *ops = NULL; | |
62 | ||
63 | mutex_lock(&rate_ctrl_mutex); | |
64 | list_for_each_entry(alg, &rate_ctrl_algs, list) { | |
65 | if (!name || !strcmp(alg->ops->name, name)) | |
66 | if (try_module_get(alg->ops->module)) { | |
67 | ops = alg->ops; | |
68 | break; | |
69 | } | |
70 | } | |
71 | mutex_unlock(&rate_ctrl_mutex); | |
72 | return ops; | |
73 | } | |
74 | ||
75 | /* Get the rate control algorithm. If `name' is NULL, get the first | |
76 | * available algorithm. */ | |
77 | static struct rate_control_ops * | |
78 | ieee80211_rate_control_ops_get(const char *name) | |
79 | { | |
80 | struct rate_control_ops *ops; | |
81 | ||
82 | ops = ieee80211_try_rate_control_ops_get(name); | |
83 | if (!ops) { | |
84 | request_module("rc80211_%s", name ? name : "default"); | |
85 | ops = ieee80211_try_rate_control_ops_get(name); | |
86 | } | |
87 | return ops; | |
88 | } | |
89 | ||
90 | static void ieee80211_rate_control_ops_put(struct rate_control_ops *ops) | |
91 | { | |
92 | module_put(ops->module); | |
93 | } | |
94 | ||
95 | struct rate_control_ref *rate_control_alloc(const char *name, | |
96 | struct ieee80211_local *local) | |
97 | { | |
98 | struct rate_control_ref *ref; | |
99 | ||
100 | ref = kmalloc(sizeof(struct rate_control_ref), GFP_KERNEL); | |
101 | if (!ref) | |
102 | goto fail_ref; | |
103 | kref_init(&ref->kref); | |
104 | ref->ops = ieee80211_rate_control_ops_get(name); | |
105 | if (!ref->ops) | |
106 | goto fail_ops; | |
107 | ref->priv = ref->ops->alloc(local); | |
108 | if (!ref->priv) | |
109 | goto fail_priv; | |
110 | return ref; | |
111 | ||
112 | fail_priv: | |
113 | ieee80211_rate_control_ops_put(ref->ops); | |
114 | fail_ops: | |
115 | kfree(ref); | |
116 | fail_ref: | |
117 | return NULL; | |
118 | } | |
119 | ||
120 | static void rate_control_release(struct kref *kref) | |
121 | { | |
122 | struct rate_control_ref *ctrl_ref; | |
123 | ||
124 | ctrl_ref = container_of(kref, struct rate_control_ref, kref); | |
125 | ctrl_ref->ops->free(ctrl_ref->priv); | |
126 | ieee80211_rate_control_ops_put(ctrl_ref->ops); | |
127 | kfree(ctrl_ref); | |
128 | } | |
129 | ||
130 | struct rate_control_ref *rate_control_get(struct rate_control_ref *ref) | |
131 | { | |
132 | kref_get(&ref->kref); | |
133 | return ref; | |
134 | } | |
135 | ||
136 | void rate_control_put(struct rate_control_ref *ref) | |
137 | { | |
138 | kref_put(&ref->kref, rate_control_release); | |
139 | } |