Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 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> |
Johannes Berg | ff68808 | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 12 | #include <linux/rtnetlink.h> |
Johannes Berg | 2c8dccc | 2008-04-08 15:14:40 -0400 | [diff] [blame] | 13 | #include "rate.h" |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 14 | #include "ieee80211_i.h" |
Johannes Berg | 4b7679a | 2008-09-18 18:14:18 +0200 | [diff] [blame] | 15 | #include "debugfs.h" |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 16 | |
| 17 | struct rate_control_alg { |
| 18 | struct list_head list; |
| 19 | struct rate_control_ops *ops; |
| 20 | }; |
| 21 | |
| 22 | static LIST_HEAD(rate_ctrl_algs); |
| 23 | static DEFINE_MUTEX(rate_ctrl_mutex); |
| 24 | |
Stefano Brivio | c21b39a | 2007-12-19 01:26:16 +0100 | [diff] [blame] | 25 | static char *ieee80211_default_rc_algo = CONFIG_MAC80211_RC_DEFAULT; |
| 26 | module_param(ieee80211_default_rc_algo, charp, 0644); |
| 27 | MODULE_PARM_DESC(ieee80211_default_rc_algo, |
| 28 | "Default rate control algorithm for mac80211 to use"); |
| 29 | |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 30 | int ieee80211_rate_control_register(struct rate_control_ops *ops) |
| 31 | { |
| 32 | struct rate_control_alg *alg; |
| 33 | |
Johannes Berg | ac71c69 | 2007-10-28 14:17:44 +0100 | [diff] [blame] | 34 | if (!ops->name) |
| 35 | return -EINVAL; |
| 36 | |
Johannes Berg | 999acd9 | 2007-10-28 14:49:33 +0100 | [diff] [blame] | 37 | mutex_lock(&rate_ctrl_mutex); |
| 38 | list_for_each_entry(alg, &rate_ctrl_algs, list) { |
| 39 | if (!strcmp(alg->ops->name, ops->name)) { |
| 40 | /* don't register an algorithm twice */ |
| 41 | WARN_ON(1); |
Cyrill Gorcunov | b808ab1 | 2007-12-13 15:52:11 -0800 | [diff] [blame] | 42 | mutex_unlock(&rate_ctrl_mutex); |
Johannes Berg | 999acd9 | 2007-10-28 14:49:33 +0100 | [diff] [blame] | 43 | return -EALREADY; |
| 44 | } |
| 45 | } |
| 46 | |
Yoann Padioleau | dd00cc4 | 2007-07-19 01:49:03 -0700 | [diff] [blame] | 47 | alg = kzalloc(sizeof(*alg), GFP_KERNEL); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 48 | if (alg == NULL) { |
Johannes Berg | 999acd9 | 2007-10-28 14:49:33 +0100 | [diff] [blame] | 49 | mutex_unlock(&rate_ctrl_mutex); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 50 | return -ENOMEM; |
| 51 | } |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 52 | alg->ops = ops; |
| 53 | |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 54 | list_add_tail(&alg->list, &rate_ctrl_algs); |
| 55 | mutex_unlock(&rate_ctrl_mutex); |
| 56 | |
| 57 | return 0; |
| 58 | } |
| 59 | EXPORT_SYMBOL(ieee80211_rate_control_register); |
| 60 | |
| 61 | void ieee80211_rate_control_unregister(struct rate_control_ops *ops) |
| 62 | { |
| 63 | struct rate_control_alg *alg; |
| 64 | |
| 65 | mutex_lock(&rate_ctrl_mutex); |
| 66 | list_for_each_entry(alg, &rate_ctrl_algs, list) { |
| 67 | if (alg->ops == ops) { |
| 68 | list_del(&alg->list); |
Cyrill Gorcunov | 20880e8 | 2007-12-13 16:17:03 -0800 | [diff] [blame] | 69 | kfree(alg); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 70 | break; |
| 71 | } |
| 72 | } |
| 73 | mutex_unlock(&rate_ctrl_mutex); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 74 | } |
| 75 | EXPORT_SYMBOL(ieee80211_rate_control_unregister); |
| 76 | |
| 77 | static struct rate_control_ops * |
| 78 | ieee80211_try_rate_control_ops_get(const char *name) |
| 79 | { |
| 80 | struct rate_control_alg *alg; |
| 81 | struct rate_control_ops *ops = NULL; |
| 82 | |
Johannes Berg | ac71c69 | 2007-10-28 14:17:44 +0100 | [diff] [blame] | 83 | if (!name) |
| 84 | return NULL; |
| 85 | |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 86 | mutex_lock(&rate_ctrl_mutex); |
| 87 | list_for_each_entry(alg, &rate_ctrl_algs, list) { |
Johannes Berg | ac71c69 | 2007-10-28 14:17:44 +0100 | [diff] [blame] | 88 | if (!strcmp(alg->ops->name, name)) |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 89 | if (try_module_get(alg->ops->module)) { |
| 90 | ops = alg->ops; |
| 91 | break; |
| 92 | } |
| 93 | } |
| 94 | mutex_unlock(&rate_ctrl_mutex); |
| 95 | return ops; |
| 96 | } |
| 97 | |
Stefano Brivio | c21b39a | 2007-12-19 01:26:16 +0100 | [diff] [blame] | 98 | /* Get the rate control algorithm. */ |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 99 | static struct rate_control_ops * |
| 100 | ieee80211_rate_control_ops_get(const char *name) |
| 101 | { |
| 102 | struct rate_control_ops *ops; |
Stefano Brivio | c21b39a | 2007-12-19 01:26:16 +0100 | [diff] [blame] | 103 | const char *alg_name; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 104 | |
Johannes Berg | ac71c69 | 2007-10-28 14:17:44 +0100 | [diff] [blame] | 105 | if (!name) |
Stefano Brivio | c21b39a | 2007-12-19 01:26:16 +0100 | [diff] [blame] | 106 | alg_name = ieee80211_default_rc_algo; |
| 107 | else |
| 108 | alg_name = name; |
Johannes Berg | ac71c69 | 2007-10-28 14:17:44 +0100 | [diff] [blame] | 109 | |
Stefano Brivio | c21b39a | 2007-12-19 01:26:16 +0100 | [diff] [blame] | 110 | ops = ieee80211_try_rate_control_ops_get(alg_name); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 111 | if (!ops) { |
Stefano Brivio | c21b39a | 2007-12-19 01:26:16 +0100 | [diff] [blame] | 112 | request_module("rc80211_%s", alg_name); |
| 113 | ops = ieee80211_try_rate_control_ops_get(alg_name); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 114 | } |
Stefano Brivio | c21b39a | 2007-12-19 01:26:16 +0100 | [diff] [blame] | 115 | if (!ops && name) |
| 116 | /* try default if specific alg requested but not found */ |
| 117 | ops = ieee80211_try_rate_control_ops_get(ieee80211_default_rc_algo); |
| 118 | |
Johannes Berg | 4b47589 | 2008-01-02 15:17:03 +0100 | [diff] [blame] | 119 | /* try built-in one if specific alg requested but not found */ |
| 120 | if (!ops && strlen(CONFIG_MAC80211_RC_DEFAULT)) |
| 121 | ops = ieee80211_try_rate_control_ops_get(CONFIG_MAC80211_RC_DEFAULT); |
| 122 | |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 123 | return ops; |
| 124 | } |
| 125 | |
| 126 | static void ieee80211_rate_control_ops_put(struct rate_control_ops *ops) |
| 127 | { |
| 128 | module_put(ops->module); |
| 129 | } |
| 130 | |
Johannes Berg | 4b7679a | 2008-09-18 18:14:18 +0200 | [diff] [blame] | 131 | #ifdef CONFIG_MAC80211_DEBUGFS |
| 132 | static ssize_t rcname_read(struct file *file, char __user *userbuf, |
| 133 | size_t count, loff_t *ppos) |
| 134 | { |
| 135 | struct rate_control_ref *ref = file->private_data; |
| 136 | int len = strlen(ref->ops->name); |
| 137 | |
| 138 | return simple_read_from_buffer(userbuf, count, ppos, |
| 139 | ref->ops->name, len); |
| 140 | } |
| 141 | |
| 142 | static const struct file_operations rcname_ops = { |
| 143 | .read = rcname_read, |
| 144 | .open = mac80211_open_file_generic, |
| 145 | }; |
| 146 | #endif |
| 147 | |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 148 | struct rate_control_ref *rate_control_alloc(const char *name, |
| 149 | struct ieee80211_local *local) |
| 150 | { |
Johannes Berg | 4b7679a | 2008-09-18 18:14:18 +0200 | [diff] [blame] | 151 | struct dentry *debugfsdir = NULL; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 152 | struct rate_control_ref *ref; |
| 153 | |
| 154 | ref = kmalloc(sizeof(struct rate_control_ref), GFP_KERNEL); |
| 155 | if (!ref) |
| 156 | goto fail_ref; |
| 157 | kref_init(&ref->kref); |
Johannes Berg | 4b7679a | 2008-09-18 18:14:18 +0200 | [diff] [blame] | 158 | ref->local = local; |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 159 | ref->ops = ieee80211_rate_control_ops_get(name); |
| 160 | if (!ref->ops) |
| 161 | goto fail_ops; |
Johannes Berg | 4b7679a | 2008-09-18 18:14:18 +0200 | [diff] [blame] | 162 | |
| 163 | #ifdef CONFIG_MAC80211_DEBUGFS |
| 164 | debugfsdir = debugfs_create_dir("rc", local->hw.wiphy->debugfsdir); |
| 165 | local->debugfs.rcdir = debugfsdir; |
| 166 | local->debugfs.rcname = debugfs_create_file("name", 0400, debugfsdir, |
| 167 | ref, &rcname_ops); |
| 168 | #endif |
| 169 | |
| 170 | ref->priv = ref->ops->alloc(&local->hw, debugfsdir); |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 171 | if (!ref->priv) |
| 172 | goto fail_priv; |
| 173 | return ref; |
| 174 | |
| 175 | fail_priv: |
| 176 | ieee80211_rate_control_ops_put(ref->ops); |
| 177 | fail_ops: |
| 178 | kfree(ref); |
| 179 | fail_ref: |
| 180 | return NULL; |
| 181 | } |
| 182 | |
| 183 | static void rate_control_release(struct kref *kref) |
| 184 | { |
| 185 | struct rate_control_ref *ctrl_ref; |
| 186 | |
| 187 | ctrl_ref = container_of(kref, struct rate_control_ref, kref); |
| 188 | ctrl_ref->ops->free(ctrl_ref->priv); |
Johannes Berg | 4b7679a | 2008-09-18 18:14:18 +0200 | [diff] [blame] | 189 | |
| 190 | #ifdef CONFIG_MAC80211_DEBUGFS |
| 191 | debugfs_remove(ctrl_ref->local->debugfs.rcname); |
| 192 | ctrl_ref->local->debugfs.rcname = NULL; |
| 193 | debugfs_remove(ctrl_ref->local->debugfs.rcdir); |
| 194 | ctrl_ref->local->debugfs.rcdir = NULL; |
| 195 | #endif |
| 196 | |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 197 | ieee80211_rate_control_ops_put(ctrl_ref->ops); |
| 198 | kfree(ctrl_ref); |
| 199 | } |
| 200 | |
Johannes Berg | 4b7679a | 2008-09-18 18:14:18 +0200 | [diff] [blame] | 201 | void rate_control_get_rate(struct ieee80211_sub_if_data *sdata, |
Johannes Berg | e6a9854 | 2008-10-21 12:40:02 +0200 | [diff] [blame] | 202 | struct sta_info *sta, |
| 203 | struct ieee80211_tx_rate_control *txrc) |
Mattias Nissler | 1abbe49 | 2007-12-20 13:50:07 +0100 | [diff] [blame] | 204 | { |
Johannes Berg | 4b7679a | 2008-09-18 18:14:18 +0200 | [diff] [blame] | 205 | struct rate_control_ref *ref = sdata->local->rate_ctrl; |
| 206 | void *priv_sta = NULL; |
| 207 | struct ieee80211_sta *ista = NULL; |
Johannes Berg | e6a9854 | 2008-10-21 12:40:02 +0200 | [diff] [blame] | 208 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb); |
Mattias Nissler | 1abbe49 | 2007-12-20 13:50:07 +0100 | [diff] [blame] | 209 | int i; |
Mattias Nissler | 1abbe49 | 2007-12-20 13:50:07 +0100 | [diff] [blame] | 210 | |
Johannes Berg | 4b7679a | 2008-09-18 18:14:18 +0200 | [diff] [blame] | 211 | if (sta) { |
| 212 | ista = &sta->sta; |
| 213 | priv_sta = sta->rate_ctrl_priv; |
| 214 | } |
| 215 | |
Johannes Berg | e6a9854 | 2008-10-21 12:40:02 +0200 | [diff] [blame] | 216 | for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { |
| 217 | info->control.rates[i].idx = -1; |
| 218 | info->control.rates[i].flags = 0; |
| 219 | info->control.rates[i].count = 1; |
Mattias Nissler | 1abbe49 | 2007-12-20 13:50:07 +0100 | [diff] [blame] | 220 | } |
Johannes Berg | e6a9854 | 2008-10-21 12:40:02 +0200 | [diff] [blame] | 221 | |
Johannes Berg | 2b874e8 | 2009-03-23 14:10:22 +0100 | [diff] [blame] | 222 | if (sta && sdata->force_unicast_rateidx > -1) { |
Johannes Berg | e6a9854 | 2008-10-21 12:40:02 +0200 | [diff] [blame] | 223 | info->control.rates[0].idx = sdata->force_unicast_rateidx; |
Johannes Berg | 2b874e8 | 2009-03-23 14:10:22 +0100 | [diff] [blame] | 224 | } else { |
Johannes Berg | e6a9854 | 2008-10-21 12:40:02 +0200 | [diff] [blame] | 225 | ref->ops->get_rate(ref->priv, ista, priv_sta, txrc); |
Johannes Berg | 2b874e8 | 2009-03-23 14:10:22 +0100 | [diff] [blame] | 226 | info->flags |= IEEE80211_TX_INTFL_RCALGO; |
| 227 | } |
Johannes Berg | e6a9854 | 2008-10-21 12:40:02 +0200 | [diff] [blame] | 228 | |
| 229 | /* |
| 230 | * try to enforce the maximum rate the user wanted |
| 231 | */ |
| 232 | if (sdata->max_ratectrl_rateidx > -1) |
| 233 | for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { |
| 234 | if (info->control.rates[i].flags & IEEE80211_TX_RC_MCS) |
| 235 | continue; |
| 236 | info->control.rates[i].idx = |
| 237 | min_t(s8, info->control.rates[i].idx, |
| 238 | sdata->max_ratectrl_rateidx); |
| 239 | } |
| 240 | |
| 241 | BUG_ON(info->control.rates[0].idx < 0); |
Mattias Nissler | 1abbe49 | 2007-12-20 13:50:07 +0100 | [diff] [blame] | 242 | } |
| 243 | |
Jiri Benc | f0706e8 | 2007-05-05 11:45:53 -0700 | [diff] [blame] | 244 | struct rate_control_ref *rate_control_get(struct rate_control_ref *ref) |
| 245 | { |
| 246 | kref_get(&ref->kref); |
| 247 | return ref; |
| 248 | } |
| 249 | |
| 250 | void rate_control_put(struct rate_control_ref *ref) |
| 251 | { |
| 252 | kref_put(&ref->kref, rate_control_release); |
| 253 | } |
Johannes Berg | ff68808 | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 254 | |
| 255 | int ieee80211_init_rate_ctrl_alg(struct ieee80211_local *local, |
| 256 | const char *name) |
| 257 | { |
| 258 | struct rate_control_ref *ref, *old; |
| 259 | |
| 260 | ASSERT_RTNL(); |
Johannes Berg | f9d540e | 2007-09-28 14:02:09 +0200 | [diff] [blame] | 261 | if (local->open_count || netif_running(local->mdev)) |
Johannes Berg | ff68808 | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 262 | return -EBUSY; |
| 263 | |
| 264 | ref = rate_control_alloc(name, local); |
| 265 | if (!ref) { |
| 266 | printk(KERN_WARNING "%s: Failed to select rate control " |
Johannes Berg | dd1cd4c | 2007-09-18 17:29:20 -0400 | [diff] [blame] | 267 | "algorithm\n", wiphy_name(local->hw.wiphy)); |
Johannes Berg | ff68808 | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 268 | return -ENOENT; |
| 269 | } |
| 270 | |
| 271 | old = local->rate_ctrl; |
| 272 | local->rate_ctrl = ref; |
| 273 | if (old) { |
| 274 | rate_control_put(old); |
| 275 | sta_info_flush(local, NULL); |
| 276 | } |
| 277 | |
| 278 | printk(KERN_DEBUG "%s: Selected rate control " |
Johannes Berg | dd1cd4c | 2007-09-18 17:29:20 -0400 | [diff] [blame] | 279 | "algorithm '%s'\n", wiphy_name(local->hw.wiphy), |
Johannes Berg | ff68808 | 2007-07-27 15:43:23 +0200 | [diff] [blame] | 280 | ref->ops->name); |
| 281 | |
| 282 | |
| 283 | return 0; |
| 284 | } |
| 285 | |
| 286 | void rate_control_deinitialize(struct ieee80211_local *local) |
| 287 | { |
| 288 | struct rate_control_ref *ref; |
| 289 | |
| 290 | ref = local->rate_ctrl; |
| 291 | local->rate_ctrl = NULL; |
| 292 | rate_control_put(ref); |
| 293 | } |
Stefano Brivio | c21b39a | 2007-12-19 01:26:16 +0100 | [diff] [blame] | 294 | |