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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> | |
ff688089 | 12 | #include <linux/rtnetlink.h> |
f0706e82 JB |
13 | #include "ieee80211_rate.h" |
14 | #include "ieee80211_i.h" | |
15 | ||
16 | struct rate_control_alg { | |
17 | struct list_head list; | |
18 | struct rate_control_ops *ops; | |
19 | }; | |
20 | ||
21 | static LIST_HEAD(rate_ctrl_algs); | |
22 | static DEFINE_MUTEX(rate_ctrl_mutex); | |
23 | ||
24 | int ieee80211_rate_control_register(struct rate_control_ops *ops) | |
25 | { | |
26 | struct rate_control_alg *alg; | |
27 | ||
ac71c691 JB |
28 | if (!ops->name) |
29 | return -EINVAL; | |
30 | ||
dd00cc48 | 31 | alg = kzalloc(sizeof(*alg), GFP_KERNEL); |
f0706e82 JB |
32 | if (alg == NULL) { |
33 | return -ENOMEM; | |
34 | } | |
f0706e82 JB |
35 | alg->ops = ops; |
36 | ||
37 | mutex_lock(&rate_ctrl_mutex); | |
38 | list_add_tail(&alg->list, &rate_ctrl_algs); | |
39 | mutex_unlock(&rate_ctrl_mutex); | |
40 | ||
41 | return 0; | |
42 | } | |
43 | EXPORT_SYMBOL(ieee80211_rate_control_register); | |
44 | ||
45 | void ieee80211_rate_control_unregister(struct rate_control_ops *ops) | |
46 | { | |
47 | struct rate_control_alg *alg; | |
48 | ||
49 | mutex_lock(&rate_ctrl_mutex); | |
50 | list_for_each_entry(alg, &rate_ctrl_algs, list) { | |
51 | if (alg->ops == ops) { | |
52 | list_del(&alg->list); | |
53 | break; | |
54 | } | |
55 | } | |
56 | mutex_unlock(&rate_ctrl_mutex); | |
57 | kfree(alg); | |
58 | } | |
59 | EXPORT_SYMBOL(ieee80211_rate_control_unregister); | |
60 | ||
61 | static struct rate_control_ops * | |
62 | ieee80211_try_rate_control_ops_get(const char *name) | |
63 | { | |
64 | struct rate_control_alg *alg; | |
65 | struct rate_control_ops *ops = NULL; | |
66 | ||
ac71c691 JB |
67 | if (!name) |
68 | return NULL; | |
69 | ||
f0706e82 JB |
70 | mutex_lock(&rate_ctrl_mutex); |
71 | list_for_each_entry(alg, &rate_ctrl_algs, list) { | |
ac71c691 | 72 | if (!strcmp(alg->ops->name, name)) |
f0706e82 JB |
73 | if (try_module_get(alg->ops->module)) { |
74 | ops = alg->ops; | |
75 | break; | |
76 | } | |
77 | } | |
78 | mutex_unlock(&rate_ctrl_mutex); | |
79 | return ops; | |
80 | } | |
81 | ||
82 | /* Get the rate control algorithm. If `name' is NULL, get the first | |
83 | * available algorithm. */ | |
84 | static struct rate_control_ops * | |
85 | ieee80211_rate_control_ops_get(const char *name) | |
86 | { | |
87 | struct rate_control_ops *ops; | |
88 | ||
ac71c691 JB |
89 | if (!name) |
90 | name = "simple"; | |
91 | ||
f0706e82 JB |
92 | ops = ieee80211_try_rate_control_ops_get(name); |
93 | if (!ops) { | |
ac71c691 | 94 | request_module("rc80211_%s", name); |
f0706e82 JB |
95 | ops = ieee80211_try_rate_control_ops_get(name); |
96 | } | |
97 | return ops; | |
98 | } | |
99 | ||
100 | static void ieee80211_rate_control_ops_put(struct rate_control_ops *ops) | |
101 | { | |
102 | module_put(ops->module); | |
103 | } | |
104 | ||
105 | struct rate_control_ref *rate_control_alloc(const char *name, | |
106 | struct ieee80211_local *local) | |
107 | { | |
108 | struct rate_control_ref *ref; | |
109 | ||
110 | ref = kmalloc(sizeof(struct rate_control_ref), GFP_KERNEL); | |
111 | if (!ref) | |
112 | goto fail_ref; | |
113 | kref_init(&ref->kref); | |
114 | ref->ops = ieee80211_rate_control_ops_get(name); | |
115 | if (!ref->ops) | |
116 | goto fail_ops; | |
117 | ref->priv = ref->ops->alloc(local); | |
118 | if (!ref->priv) | |
119 | goto fail_priv; | |
120 | return ref; | |
121 | ||
122 | fail_priv: | |
123 | ieee80211_rate_control_ops_put(ref->ops); | |
124 | fail_ops: | |
125 | kfree(ref); | |
126 | fail_ref: | |
127 | return NULL; | |
128 | } | |
129 | ||
130 | static void rate_control_release(struct kref *kref) | |
131 | { | |
132 | struct rate_control_ref *ctrl_ref; | |
133 | ||
134 | ctrl_ref = container_of(kref, struct rate_control_ref, kref); | |
135 | ctrl_ref->ops->free(ctrl_ref->priv); | |
136 | ieee80211_rate_control_ops_put(ctrl_ref->ops); | |
137 | kfree(ctrl_ref); | |
138 | } | |
139 | ||
140 | struct rate_control_ref *rate_control_get(struct rate_control_ref *ref) | |
141 | { | |
142 | kref_get(&ref->kref); | |
143 | return ref; | |
144 | } | |
145 | ||
146 | void rate_control_put(struct rate_control_ref *ref) | |
147 | { | |
148 | kref_put(&ref->kref, rate_control_release); | |
149 | } | |
ff688089 JB |
150 | |
151 | int ieee80211_init_rate_ctrl_alg(struct ieee80211_local *local, | |
152 | const char *name) | |
153 | { | |
154 | struct rate_control_ref *ref, *old; | |
155 | ||
156 | ASSERT_RTNL(); | |
f9d540ee | 157 | if (local->open_count || netif_running(local->mdev)) |
ff688089 JB |
158 | return -EBUSY; |
159 | ||
160 | ref = rate_control_alloc(name, local); | |
161 | if (!ref) { | |
162 | printk(KERN_WARNING "%s: Failed to select rate control " | |
dd1cd4c6 | 163 | "algorithm\n", wiphy_name(local->hw.wiphy)); |
ff688089 JB |
164 | return -ENOENT; |
165 | } | |
166 | ||
167 | old = local->rate_ctrl; | |
168 | local->rate_ctrl = ref; | |
169 | if (old) { | |
170 | rate_control_put(old); | |
171 | sta_info_flush(local, NULL); | |
172 | } | |
173 | ||
174 | printk(KERN_DEBUG "%s: Selected rate control " | |
dd1cd4c6 | 175 | "algorithm '%s'\n", wiphy_name(local->hw.wiphy), |
ff688089 JB |
176 | ref->ops->name); |
177 | ||
178 | ||
179 | return 0; | |
180 | } | |
181 | ||
182 | void rate_control_deinitialize(struct ieee80211_local *local) | |
183 | { | |
184 | struct rate_control_ref *ref; | |
185 | ||
186 | ref = local->rate_ctrl; | |
187 | local->rate_ctrl = NULL; | |
188 | rate_control_put(ref); | |
189 | } |