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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 | ||
1abbe498 MN |
150 | void rate_control_get_rate(struct net_device *dev, |
151 | struct ieee80211_hw_mode *mode, struct sk_buff *skb, | |
152 | struct rate_selection *sel) | |
153 | { | |
154 | struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); | |
155 | struct rate_control_ref *ref = local->rate_ctrl; | |
156 | struct ieee80211_sub_if_data *sdata; | |
157 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
158 | struct sta_info *sta = sta_info_get(local, hdr->addr1); | |
159 | int i; | |
160 | u16 fc; | |
161 | ||
162 | memset(sel, 0, sizeof(struct rate_selection)); | |
163 | ||
164 | /* Send management frames and broadcast/multicast data using lowest | |
165 | * rate. */ | |
166 | fc = le16_to_cpu(hdr->frame_control); | |
167 | if ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA || | |
168 | is_multicast_ether_addr(hdr->addr1)) | |
169 | sel->rate = rate_lowest(local, mode, sta); | |
170 | ||
171 | /* If a forced rate is in effect, select it. */ | |
172 | sdata = IEEE80211_DEV_TO_SUB_IF(dev); | |
173 | if (sdata->bss && sdata->bss->force_unicast_rateidx > -1) | |
174 | sel->rate = &mode->rates[sdata->bss->force_unicast_rateidx]; | |
175 | ||
176 | /* If we haven't found the rate yet, ask the rate control algo. */ | |
177 | if (!sel->rate) | |
178 | ref->ops->get_rate(ref->priv, dev, mode, skb, sel); | |
179 | ||
180 | /* Select a non-ERP backup rate. */ | |
181 | if (!sel->nonerp) { | |
182 | for (i = 0; i < mode->num_rates - 1; i++) { | |
183 | struct ieee80211_rate *rate = &mode->rates[i]; | |
184 | if (sel->rate->rate < rate->rate) | |
185 | break; | |
186 | ||
187 | if (rate_supported(sta, mode, i) && | |
188 | !(rate->flags & IEEE80211_RATE_ERP)) | |
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 | } |