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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 | ||
27 | alg = kmalloc(sizeof(*alg), GFP_KERNEL); | |
28 | if (alg == NULL) { | |
29 | return -ENOMEM; | |
30 | } | |
31 | memset(alg, 0, sizeof(*alg)); | |
32 | alg->ops = ops; | |
33 | ||
34 | mutex_lock(&rate_ctrl_mutex); | |
35 | list_add_tail(&alg->list, &rate_ctrl_algs); | |
36 | mutex_unlock(&rate_ctrl_mutex); | |
37 | ||
38 | return 0; | |
39 | } | |
40 | EXPORT_SYMBOL(ieee80211_rate_control_register); | |
41 | ||
42 | void ieee80211_rate_control_unregister(struct rate_control_ops *ops) | |
43 | { | |
44 | struct rate_control_alg *alg; | |
45 | ||
46 | mutex_lock(&rate_ctrl_mutex); | |
47 | list_for_each_entry(alg, &rate_ctrl_algs, list) { | |
48 | if (alg->ops == ops) { | |
49 | list_del(&alg->list); | |
50 | break; | |
51 | } | |
52 | } | |
53 | mutex_unlock(&rate_ctrl_mutex); | |
54 | kfree(alg); | |
55 | } | |
56 | EXPORT_SYMBOL(ieee80211_rate_control_unregister); | |
57 | ||
58 | static struct rate_control_ops * | |
59 | ieee80211_try_rate_control_ops_get(const char *name) | |
60 | { | |
61 | struct rate_control_alg *alg; | |
62 | struct rate_control_ops *ops = NULL; | |
63 | ||
64 | mutex_lock(&rate_ctrl_mutex); | |
65 | list_for_each_entry(alg, &rate_ctrl_algs, list) { | |
66 | if (!name || !strcmp(alg->ops->name, name)) | |
67 | if (try_module_get(alg->ops->module)) { | |
68 | ops = alg->ops; | |
69 | break; | |
70 | } | |
71 | } | |
72 | mutex_unlock(&rate_ctrl_mutex); | |
73 | return ops; | |
74 | } | |
75 | ||
76 | /* Get the rate control algorithm. If `name' is NULL, get the first | |
77 | * available algorithm. */ | |
78 | static struct rate_control_ops * | |
79 | ieee80211_rate_control_ops_get(const char *name) | |
80 | { | |
81 | struct rate_control_ops *ops; | |
82 | ||
83 | ops = ieee80211_try_rate_control_ops_get(name); | |
84 | if (!ops) { | |
85 | request_module("rc80211_%s", name ? name : "default"); | |
86 | ops = ieee80211_try_rate_control_ops_get(name); | |
87 | } | |
88 | return ops; | |
89 | } | |
90 | ||
91 | static void ieee80211_rate_control_ops_put(struct rate_control_ops *ops) | |
92 | { | |
93 | module_put(ops->module); | |
94 | } | |
95 | ||
96 | struct rate_control_ref *rate_control_alloc(const char *name, | |
97 | struct ieee80211_local *local) | |
98 | { | |
99 | struct rate_control_ref *ref; | |
100 | ||
101 | ref = kmalloc(sizeof(struct rate_control_ref), GFP_KERNEL); | |
102 | if (!ref) | |
103 | goto fail_ref; | |
104 | kref_init(&ref->kref); | |
105 | ref->ops = ieee80211_rate_control_ops_get(name); | |
106 | if (!ref->ops) | |
107 | goto fail_ops; | |
108 | ref->priv = ref->ops->alloc(local); | |
109 | if (!ref->priv) | |
110 | goto fail_priv; | |
111 | return ref; | |
112 | ||
113 | fail_priv: | |
114 | ieee80211_rate_control_ops_put(ref->ops); | |
115 | fail_ops: | |
116 | kfree(ref); | |
117 | fail_ref: | |
118 | return NULL; | |
119 | } | |
120 | ||
121 | static void rate_control_release(struct kref *kref) | |
122 | { | |
123 | struct rate_control_ref *ctrl_ref; | |
124 | ||
125 | ctrl_ref = container_of(kref, struct rate_control_ref, kref); | |
126 | ctrl_ref->ops->free(ctrl_ref->priv); | |
127 | ieee80211_rate_control_ops_put(ctrl_ref->ops); | |
128 | kfree(ctrl_ref); | |
129 | } | |
130 | ||
131 | struct rate_control_ref *rate_control_get(struct rate_control_ref *ref) | |
132 | { | |
133 | kref_get(&ref->kref); | |
134 | return ref; | |
135 | } | |
136 | ||
137 | void rate_control_put(struct rate_control_ref *ref) | |
138 | { | |
139 | kref_put(&ref->kref, rate_control_release); | |
140 | } |