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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 | ||
999acd9c JB |
31 | mutex_lock(&rate_ctrl_mutex); |
32 | list_for_each_entry(alg, &rate_ctrl_algs, list) { | |
33 | if (!strcmp(alg->ops->name, ops->name)) { | |
34 | /* don't register an algorithm twice */ | |
35 | WARN_ON(1); | |
b808ab16 | 36 | mutex_unlock(&rate_ctrl_mutex); |
999acd9c JB |
37 | return -EALREADY; |
38 | } | |
39 | } | |
40 | ||
dd00cc48 | 41 | alg = kzalloc(sizeof(*alg), GFP_KERNEL); |
f0706e82 | 42 | if (alg == NULL) { |
999acd9c | 43 | mutex_unlock(&rate_ctrl_mutex); |
f0706e82 JB |
44 | return -ENOMEM; |
45 | } | |
f0706e82 JB |
46 | alg->ops = ops; |
47 | ||
f0706e82 JB |
48 | list_add_tail(&alg->list, &rate_ctrl_algs); |
49 | mutex_unlock(&rate_ctrl_mutex); | |
50 | ||
51 | return 0; | |
52 | } | |
53 | EXPORT_SYMBOL(ieee80211_rate_control_register); | |
54 | ||
55 | void ieee80211_rate_control_unregister(struct rate_control_ops *ops) | |
56 | { | |
57 | struct rate_control_alg *alg; | |
58 | ||
59 | mutex_lock(&rate_ctrl_mutex); | |
60 | list_for_each_entry(alg, &rate_ctrl_algs, list) { | |
61 | if (alg->ops == ops) { | |
62 | list_del(&alg->list); | |
20880e89 | 63 | kfree(alg); |
f0706e82 JB |
64 | break; |
65 | } | |
66 | } | |
67 | mutex_unlock(&rate_ctrl_mutex); | |
f0706e82 JB |
68 | } |
69 | EXPORT_SYMBOL(ieee80211_rate_control_unregister); | |
70 | ||
71 | static struct rate_control_ops * | |
72 | ieee80211_try_rate_control_ops_get(const char *name) | |
73 | { | |
74 | struct rate_control_alg *alg; | |
75 | struct rate_control_ops *ops = NULL; | |
76 | ||
ac71c691 JB |
77 | if (!name) |
78 | return NULL; | |
79 | ||
f0706e82 JB |
80 | mutex_lock(&rate_ctrl_mutex); |
81 | list_for_each_entry(alg, &rate_ctrl_algs, list) { | |
ac71c691 | 82 | if (!strcmp(alg->ops->name, name)) |
f0706e82 JB |
83 | if (try_module_get(alg->ops->module)) { |
84 | ops = alg->ops; | |
85 | break; | |
86 | } | |
87 | } | |
88 | mutex_unlock(&rate_ctrl_mutex); | |
89 | return ops; | |
90 | } | |
91 | ||
92 | /* Get the rate control algorithm. If `name' is NULL, get the first | |
93 | * available algorithm. */ | |
94 | static struct rate_control_ops * | |
95 | ieee80211_rate_control_ops_get(const char *name) | |
96 | { | |
97 | struct rate_control_ops *ops; | |
98 | ||
ac71c691 JB |
99 | if (!name) |
100 | name = "simple"; | |
101 | ||
f0706e82 JB |
102 | ops = ieee80211_try_rate_control_ops_get(name); |
103 | if (!ops) { | |
ac71c691 | 104 | request_module("rc80211_%s", name); |
f0706e82 JB |
105 | ops = ieee80211_try_rate_control_ops_get(name); |
106 | } | |
107 | return ops; | |
108 | } | |
109 | ||
110 | static void ieee80211_rate_control_ops_put(struct rate_control_ops *ops) | |
111 | { | |
112 | module_put(ops->module); | |
113 | } | |
114 | ||
115 | struct rate_control_ref *rate_control_alloc(const char *name, | |
116 | struct ieee80211_local *local) | |
117 | { | |
118 | struct rate_control_ref *ref; | |
119 | ||
120 | ref = kmalloc(sizeof(struct rate_control_ref), GFP_KERNEL); | |
121 | if (!ref) | |
122 | goto fail_ref; | |
123 | kref_init(&ref->kref); | |
124 | ref->ops = ieee80211_rate_control_ops_get(name); | |
125 | if (!ref->ops) | |
126 | goto fail_ops; | |
127 | ref->priv = ref->ops->alloc(local); | |
128 | if (!ref->priv) | |
129 | goto fail_priv; | |
130 | return ref; | |
131 | ||
132 | fail_priv: | |
133 | ieee80211_rate_control_ops_put(ref->ops); | |
134 | fail_ops: | |
135 | kfree(ref); | |
136 | fail_ref: | |
137 | return NULL; | |
138 | } | |
139 | ||
140 | static void rate_control_release(struct kref *kref) | |
141 | { | |
142 | struct rate_control_ref *ctrl_ref; | |
143 | ||
144 | ctrl_ref = container_of(kref, struct rate_control_ref, kref); | |
145 | ctrl_ref->ops->free(ctrl_ref->priv); | |
146 | ieee80211_rate_control_ops_put(ctrl_ref->ops); | |
147 | kfree(ctrl_ref); | |
148 | } | |
149 | ||
150 | struct rate_control_ref *rate_control_get(struct rate_control_ref *ref) | |
151 | { | |
152 | kref_get(&ref->kref); | |
153 | return ref; | |
154 | } | |
155 | ||
156 | void rate_control_put(struct rate_control_ref *ref) | |
157 | { | |
158 | kref_put(&ref->kref, rate_control_release); | |
159 | } | |
ff688089 JB |
160 | |
161 | int ieee80211_init_rate_ctrl_alg(struct ieee80211_local *local, | |
162 | const char *name) | |
163 | { | |
164 | struct rate_control_ref *ref, *old; | |
165 | ||
166 | ASSERT_RTNL(); | |
f9d540ee | 167 | if (local->open_count || netif_running(local->mdev)) |
ff688089 JB |
168 | return -EBUSY; |
169 | ||
170 | ref = rate_control_alloc(name, local); | |
171 | if (!ref) { | |
172 | printk(KERN_WARNING "%s: Failed to select rate control " | |
dd1cd4c6 | 173 | "algorithm\n", wiphy_name(local->hw.wiphy)); |
ff688089 JB |
174 | return -ENOENT; |
175 | } | |
176 | ||
177 | old = local->rate_ctrl; | |
178 | local->rate_ctrl = ref; | |
179 | if (old) { | |
180 | rate_control_put(old); | |
181 | sta_info_flush(local, NULL); | |
182 | } | |
183 | ||
184 | printk(KERN_DEBUG "%s: Selected rate control " | |
dd1cd4c6 | 185 | "algorithm '%s'\n", wiphy_name(local->hw.wiphy), |
ff688089 JB |
186 | ref->ops->name); |
187 | ||
188 | ||
189 | return 0; | |
190 | } | |
191 | ||
192 | void rate_control_deinitialize(struct ieee80211_local *local) | |
193 | { | |
194 | struct rate_control_ref *ref; | |
195 | ||
196 | ref = local->rate_ctrl; | |
197 | local->rate_ctrl = NULL; | |
198 | rate_control_put(ref); | |
199 | } |