Commit | Line | Data |
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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 | ||
c21b39ac SB |
24 | static char *ieee80211_default_rc_algo = CONFIG_MAC80211_RC_DEFAULT; |
25 | module_param(ieee80211_default_rc_algo, charp, 0644); | |
26 | MODULE_PARM_DESC(ieee80211_default_rc_algo, | |
27 | "Default rate control algorithm for mac80211 to use"); | |
28 | ||
f0706e82 JB |
29 | int ieee80211_rate_control_register(struct rate_control_ops *ops) |
30 | { | |
31 | struct rate_control_alg *alg; | |
32 | ||
ac71c691 JB |
33 | if (!ops->name) |
34 | return -EINVAL; | |
35 | ||
999acd9c JB |
36 | mutex_lock(&rate_ctrl_mutex); |
37 | list_for_each_entry(alg, &rate_ctrl_algs, list) { | |
38 | if (!strcmp(alg->ops->name, ops->name)) { | |
39 | /* don't register an algorithm twice */ | |
40 | WARN_ON(1); | |
b808ab16 | 41 | mutex_unlock(&rate_ctrl_mutex); |
999acd9c JB |
42 | return -EALREADY; |
43 | } | |
44 | } | |
45 | ||
dd00cc48 | 46 | alg = kzalloc(sizeof(*alg), GFP_KERNEL); |
f0706e82 | 47 | if (alg == NULL) { |
999acd9c | 48 | mutex_unlock(&rate_ctrl_mutex); |
f0706e82 JB |
49 | return -ENOMEM; |
50 | } | |
f0706e82 JB |
51 | alg->ops = ops; |
52 | ||
f0706e82 JB |
53 | list_add_tail(&alg->list, &rate_ctrl_algs); |
54 | mutex_unlock(&rate_ctrl_mutex); | |
55 | ||
56 | return 0; | |
57 | } | |
58 | EXPORT_SYMBOL(ieee80211_rate_control_register); | |
59 | ||
60 | void ieee80211_rate_control_unregister(struct rate_control_ops *ops) | |
61 | { | |
62 | struct rate_control_alg *alg; | |
63 | ||
64 | mutex_lock(&rate_ctrl_mutex); | |
65 | list_for_each_entry(alg, &rate_ctrl_algs, list) { | |
66 | if (alg->ops == ops) { | |
67 | list_del(&alg->list); | |
20880e89 | 68 | kfree(alg); |
f0706e82 JB |
69 | break; |
70 | } | |
71 | } | |
72 | mutex_unlock(&rate_ctrl_mutex); | |
f0706e82 JB |
73 | } |
74 | EXPORT_SYMBOL(ieee80211_rate_control_unregister); | |
75 | ||
76 | static struct rate_control_ops * | |
77 | ieee80211_try_rate_control_ops_get(const char *name) | |
78 | { | |
79 | struct rate_control_alg *alg; | |
80 | struct rate_control_ops *ops = NULL; | |
81 | ||
ac71c691 JB |
82 | if (!name) |
83 | return NULL; | |
84 | ||
f0706e82 JB |
85 | mutex_lock(&rate_ctrl_mutex); |
86 | list_for_each_entry(alg, &rate_ctrl_algs, list) { | |
ac71c691 | 87 | if (!strcmp(alg->ops->name, name)) |
f0706e82 JB |
88 | if (try_module_get(alg->ops->module)) { |
89 | ops = alg->ops; | |
90 | break; | |
91 | } | |
92 | } | |
93 | mutex_unlock(&rate_ctrl_mutex); | |
94 | return ops; | |
95 | } | |
96 | ||
c21b39ac | 97 | /* Get the rate control algorithm. */ |
f0706e82 JB |
98 | static struct rate_control_ops * |
99 | ieee80211_rate_control_ops_get(const char *name) | |
100 | { | |
101 | struct rate_control_ops *ops; | |
c21b39ac | 102 | const char *alg_name; |
f0706e82 | 103 | |
ac71c691 | 104 | if (!name) |
c21b39ac SB |
105 | alg_name = ieee80211_default_rc_algo; |
106 | else | |
107 | alg_name = name; | |
ac71c691 | 108 | |
c21b39ac | 109 | ops = ieee80211_try_rate_control_ops_get(alg_name); |
f0706e82 | 110 | if (!ops) { |
c21b39ac SB |
111 | request_module("rc80211_%s", alg_name); |
112 | ops = ieee80211_try_rate_control_ops_get(alg_name); | |
f0706e82 | 113 | } |
c21b39ac SB |
114 | if (!ops && name) |
115 | /* try default if specific alg requested but not found */ | |
116 | ops = ieee80211_try_rate_control_ops_get(ieee80211_default_rc_algo); | |
117 | ||
4b475898 JB |
118 | /* try built-in one if specific alg requested but not found */ |
119 | if (!ops && strlen(CONFIG_MAC80211_RC_DEFAULT)) | |
120 | ops = ieee80211_try_rate_control_ops_get(CONFIG_MAC80211_RC_DEFAULT); | |
121 | ||
f0706e82 JB |
122 | return ops; |
123 | } | |
124 | ||
125 | static void ieee80211_rate_control_ops_put(struct rate_control_ops *ops) | |
126 | { | |
127 | module_put(ops->module); | |
128 | } | |
129 | ||
130 | struct rate_control_ref *rate_control_alloc(const char *name, | |
131 | struct ieee80211_local *local) | |
132 | { | |
133 | struct rate_control_ref *ref; | |
134 | ||
135 | ref = kmalloc(sizeof(struct rate_control_ref), GFP_KERNEL); | |
136 | if (!ref) | |
137 | goto fail_ref; | |
138 | kref_init(&ref->kref); | |
139 | ref->ops = ieee80211_rate_control_ops_get(name); | |
140 | if (!ref->ops) | |
141 | goto fail_ops; | |
142 | ref->priv = ref->ops->alloc(local); | |
143 | if (!ref->priv) | |
144 | goto fail_priv; | |
145 | return ref; | |
146 | ||
147 | fail_priv: | |
148 | ieee80211_rate_control_ops_put(ref->ops); | |
149 | fail_ops: | |
150 | kfree(ref); | |
151 | fail_ref: | |
152 | return NULL; | |
153 | } | |
154 | ||
155 | static void rate_control_release(struct kref *kref) | |
156 | { | |
157 | struct rate_control_ref *ctrl_ref; | |
158 | ||
159 | ctrl_ref = container_of(kref, struct rate_control_ref, kref); | |
160 | ctrl_ref->ops->free(ctrl_ref->priv); | |
161 | ieee80211_rate_control_ops_put(ctrl_ref->ops); | |
162 | kfree(ctrl_ref); | |
163 | } | |
164 | ||
1abbe498 | 165 | void rate_control_get_rate(struct net_device *dev, |
8318d78a JB |
166 | struct ieee80211_supported_band *sband, |
167 | struct sk_buff *skb, | |
1abbe498 MN |
168 | struct rate_selection *sel) |
169 | { | |
170 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
171 | struct rate_control_ref *ref = local->rate_ctrl; | |
1abbe498 MN |
172 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
173 | struct sta_info *sta = sta_info_get(local, hdr->addr1); | |
174 | int i; | |
1abbe498 MN |
175 | |
176 | memset(sel, 0, sizeof(struct rate_selection)); | |
177 | ||
8318d78a | 178 | ref->ops->get_rate(ref->priv, dev, sband, skb, sel); |
1abbe498 MN |
179 | |
180 | /* Select a non-ERP backup rate. */ | |
181 | if (!sel->nonerp) { | |
8318d78a JB |
182 | for (i = 0; i < sband->n_bitrates; i++) { |
183 | struct ieee80211_rate *rate = &sband->bitrates[i]; | |
184 | if (sel->rate->bitrate < rate->bitrate) | |
1abbe498 MN |
185 | break; |
186 | ||
8318d78a JB |
187 | if (rate_supported(sta, sband->band, i) && |
188 | !(rate->flags & IEEE80211_RATE_ERP_G)) | |
1abbe498 MN |
189 | sel->nonerp = rate; |
190 | } | |
191 | } | |
192 | ||
193 | if (sta) | |
194 | sta_info_put(sta); | |
195 | } | |
196 | ||
f0706e82 JB |
197 | struct rate_control_ref *rate_control_get(struct rate_control_ref *ref) |
198 | { | |
199 | kref_get(&ref->kref); | |
200 | return ref; | |
201 | } | |
202 | ||
203 | void rate_control_put(struct rate_control_ref *ref) | |
204 | { | |
205 | kref_put(&ref->kref, rate_control_release); | |
206 | } | |
ff688089 JB |
207 | |
208 | int ieee80211_init_rate_ctrl_alg(struct ieee80211_local *local, | |
209 | const char *name) | |
210 | { | |
211 | struct rate_control_ref *ref, *old; | |
212 | ||
213 | ASSERT_RTNL(); | |
f9d540ee | 214 | if (local->open_count || netif_running(local->mdev)) |
ff688089 JB |
215 | return -EBUSY; |
216 | ||
217 | ref = rate_control_alloc(name, local); | |
218 | if (!ref) { | |
219 | printk(KERN_WARNING "%s: Failed to select rate control " | |
dd1cd4c6 | 220 | "algorithm\n", wiphy_name(local->hw.wiphy)); |
ff688089 JB |
221 | return -ENOENT; |
222 | } | |
223 | ||
224 | old = local->rate_ctrl; | |
225 | local->rate_ctrl = ref; | |
226 | if (old) { | |
227 | rate_control_put(old); | |
228 | sta_info_flush(local, NULL); | |
229 | } | |
230 | ||
231 | printk(KERN_DEBUG "%s: Selected rate control " | |
dd1cd4c6 | 232 | "algorithm '%s'\n", wiphy_name(local->hw.wiphy), |
ff688089 JB |
233 | ref->ops->name); |
234 | ||
235 | ||
236 | return 0; | |
237 | } | |
238 | ||
239 | void rate_control_deinitialize(struct ieee80211_local *local) | |
240 | { | |
241 | struct rate_control_ref *ref; | |
242 | ||
243 | ref = local->rate_ctrl; | |
244 | local->rate_ctrl = NULL; | |
245 | rate_control_put(ref); | |
246 | } | |
c21b39ac | 247 |