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b203ffc3 JM |
1 | /* |
2 | * Off-channel operation helpers | |
3 | * | |
4 | * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> | |
5 | * Copyright 2004, Instant802 Networks, Inc. | |
6 | * Copyright 2005, Devicescape Software, Inc. | |
7 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
8 | * Copyright 2007, Michael Wu <flamingice@sourmilk.net> | |
9 | * Copyright 2009 Johannes Berg <johannes@sipsolutions.net> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License version 2 as | |
13 | * published by the Free Software Foundation. | |
14 | */ | |
15 | #include <net/mac80211.h> | |
16 | #include "ieee80211_i.h" | |
21f83589 | 17 | #include "driver-trace.h" |
b203ffc3 JM |
18 | |
19 | /* | |
b23b025f BG |
20 | * Tell our hardware to disable PS. |
21 | * Optionally inform AP that we will go to sleep so that it will buffer | |
22 | * the frames while we are doing off-channel work. This is optional | |
23 | * because we *may* be doing work on-operating channel, and want our | |
24 | * hardware unconditionally awake, but still let the AP send us normal frames. | |
b203ffc3 | 25 | */ |
b23b025f BG |
26 | static void ieee80211_offchannel_ps_enable(struct ieee80211_sub_if_data *sdata, |
27 | bool tell_ap) | |
b203ffc3 JM |
28 | { |
29 | struct ieee80211_local *local = sdata->local; | |
4730d597 | 30 | struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; |
b203ffc3 JM |
31 | |
32 | local->offchannel_ps_enabled = false; | |
33 | ||
34 | /* FIXME: what to do when local->pspolling is true? */ | |
35 | ||
36 | del_timer_sync(&local->dynamic_ps_timer); | |
3bc3c0d7 | 37 | del_timer_sync(&ifmgd->bcn_mon_timer); |
4730d597 LR |
38 | del_timer_sync(&ifmgd->conn_mon_timer); |
39 | ||
b203ffc3 JM |
40 | cancel_work_sync(&local->dynamic_ps_enable_work); |
41 | ||
42 | if (local->hw.conf.flags & IEEE80211_CONF_PS) { | |
43 | local->offchannel_ps_enabled = true; | |
44 | local->hw.conf.flags &= ~IEEE80211_CONF_PS; | |
45 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); | |
46 | } | |
47 | ||
b23b025f BG |
48 | if (tell_ap && (!local->offchannel_ps_enabled || |
49 | !(local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK))) | |
b203ffc3 JM |
50 | /* |
51 | * If power save was enabled, no need to send a nullfunc | |
52 | * frame because AP knows that we are sleeping. But if the | |
53 | * hardware is creating the nullfunc frame for power save | |
54 | * status (ie. IEEE80211_HW_PS_NULLFUNC_STACK is not | |
55 | * enabled) and power save was enabled, the firmware just | |
56 | * sent a null frame with power save disabled. So we need | |
57 | * to send a new nullfunc frame to inform the AP that we | |
58 | * are again sleeping. | |
59 | */ | |
60 | ieee80211_send_nullfunc(local, sdata, 1); | |
61 | } | |
62 | ||
63 | /* inform AP that we are awake again, unless power save is enabled */ | |
64 | static void ieee80211_offchannel_ps_disable(struct ieee80211_sub_if_data *sdata) | |
65 | { | |
66 | struct ieee80211_local *local = sdata->local; | |
67 | ||
68 | if (!local->ps_sdata) | |
69 | ieee80211_send_nullfunc(local, sdata, 0); | |
70 | else if (local->offchannel_ps_enabled) { | |
71 | /* | |
72 | * In !IEEE80211_HW_PS_NULLFUNC_STACK case the hardware | |
73 | * will send a nullfunc frame with the powersave bit set | |
74 | * even though the AP already knows that we are sleeping. | |
75 | * This could be avoided by sending a null frame with power | |
76 | * save bit disabled before enabling the power save, but | |
77 | * this doesn't gain anything. | |
78 | * | |
79 | * When IEEE80211_HW_PS_NULLFUNC_STACK is enabled, no need | |
80 | * to send a nullfunc frame because AP already knows that | |
81 | * we are sleeping, let's just enable power save mode in | |
82 | * hardware. | |
83 | */ | |
b23b025f BG |
84 | /* TODO: Only set hardware if CONF_PS changed? |
85 | * TODO: Should we set offchannel_ps_enabled to false? | |
86 | */ | |
b203ffc3 JM |
87 | local->hw.conf.flags |= IEEE80211_CONF_PS; |
88 | ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS); | |
89 | } else if (local->hw.conf.dynamic_ps_timeout > 0) { | |
90 | /* | |
91 | * If IEEE80211_CONF_PS was not set and the dynamic_ps_timer | |
92 | * had been running before leaving the operating channel, | |
93 | * restart the timer now and send a nullfunc frame to inform | |
94 | * the AP that we are awake. | |
95 | */ | |
96 | ieee80211_send_nullfunc(local, sdata, 0); | |
97 | mod_timer(&local->dynamic_ps_timer, jiffies + | |
98 | msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); | |
99 | } | |
4730d597 | 100 | |
3bc3c0d7 | 101 | ieee80211_sta_reset_beacon_monitor(sdata); |
4730d597 | 102 | ieee80211_sta_reset_conn_monitor(sdata); |
b203ffc3 JM |
103 | } |
104 | ||
b23b025f BG |
105 | void ieee80211_offchannel_stop_vifs(struct ieee80211_local *local, |
106 | bool offchannel_ps_enable) | |
b203ffc3 JM |
107 | { |
108 | struct ieee80211_sub_if_data *sdata; | |
109 | ||
b23b025f BG |
110 | /* |
111 | * notify the AP about us leaving the channel and stop all | |
112 | * STA interfaces. | |
113 | */ | |
b203ffc3 JM |
114 | mutex_lock(&local->iflist_mtx); |
115 | list_for_each_entry(sdata, &local->interfaces, list) { | |
116 | if (!ieee80211_sdata_running(sdata)) | |
117 | continue; | |
118 | ||
b23b025f BG |
119 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) |
120 | set_bit(SDATA_STATE_OFFCHANNEL, &sdata->state); | |
121 | ||
122 | /* Check to see if we should disable beaconing. */ | |
b203ffc3 JM |
123 | if (sdata->vif.type == NL80211_IFTYPE_AP || |
124 | sdata->vif.type == NL80211_IFTYPE_ADHOC || | |
125 | sdata->vif.type == NL80211_IFTYPE_MESH_POINT) | |
126 | ieee80211_bss_info_change_notify( | |
127 | sdata, BSS_CHANGED_BEACON_ENABLED); | |
128 | ||
b23b025f | 129 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) { |
cfa6cb20 | 130 | netif_tx_stop_all_queues(sdata->dev); |
b23b025f BG |
131 | if (offchannel_ps_enable && |
132 | (sdata->vif.type == NL80211_IFTYPE_STATION) && | |
133 | sdata->u.mgd.associated) | |
134 | ieee80211_offchannel_ps_enable(sdata, true); | |
5b714c6a | 135 | } |
b203ffc3 JM |
136 | } |
137 | mutex_unlock(&local->iflist_mtx); | |
138 | } | |
139 | ||
b23b025f BG |
140 | void ieee80211_offchannel_enable_all_ps(struct ieee80211_local *local, |
141 | bool tell_ap) | |
b203ffc3 JM |
142 | { |
143 | struct ieee80211_sub_if_data *sdata; | |
144 | ||
b203ffc3 JM |
145 | mutex_lock(&local->iflist_mtx); |
146 | list_for_each_entry(sdata, &local->interfaces, list) { | |
147 | if (!ieee80211_sdata_running(sdata)) | |
148 | continue; | |
149 | ||
b23b025f BG |
150 | if (sdata->vif.type == NL80211_IFTYPE_STATION && |
151 | sdata->u.mgd.associated) | |
152 | ieee80211_offchannel_ps_enable(sdata, tell_ap); | |
b203ffc3 JM |
153 | } |
154 | mutex_unlock(&local->iflist_mtx); | |
155 | } | |
156 | ||
157 | void ieee80211_offchannel_return(struct ieee80211_local *local, | |
b23b025f BG |
158 | bool enable_beaconing, |
159 | bool offchannel_ps_disable) | |
b203ffc3 JM |
160 | { |
161 | struct ieee80211_sub_if_data *sdata; | |
162 | ||
163 | mutex_lock(&local->iflist_mtx); | |
164 | list_for_each_entry(sdata, &local->interfaces, list) { | |
165 | if (!ieee80211_sdata_running(sdata)) | |
166 | continue; | |
167 | ||
168 | /* Tell AP we're back */ | |
b23b025f BG |
169 | if (offchannel_ps_disable && |
170 | sdata->vif.type == NL80211_IFTYPE_STATION) { | |
b203ffc3 JM |
171 | if (sdata->u.mgd.associated) |
172 | ieee80211_offchannel_ps_disable(sdata); | |
b203ffc3 JM |
173 | } |
174 | ||
5b714c6a JB |
175 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) { |
176 | clear_bit(SDATA_STATE_OFFCHANNEL, &sdata->state); | |
177 | /* | |
178 | * This may wake up queues even though the driver | |
179 | * currently has them stopped. This is not very | |
180 | * likely, since the driver won't have gotten any | |
181 | * (or hardly any) new packets while we weren't | |
182 | * on the right channel, and even if it happens | |
183 | * it will at most lead to queueing up one more | |
184 | * packet per queue in mac80211 rather than on | |
185 | * the interface qdisc. | |
186 | */ | |
93895757 | 187 | netif_tx_wake_all_queues(sdata->dev); |
5b714c6a | 188 | } |
93895757 | 189 | |
b23b025f | 190 | /* Check to see if we should re-enable beaconing */ |
b203ffc3 JM |
191 | if (enable_beaconing && |
192 | (sdata->vif.type == NL80211_IFTYPE_AP || | |
193 | sdata->vif.type == NL80211_IFTYPE_ADHOC || | |
194 | sdata->vif.type == NL80211_IFTYPE_MESH_POINT)) | |
195 | ieee80211_bss_info_change_notify( | |
196 | sdata, BSS_CHANGED_BEACON_ENABLED); | |
197 | } | |
198 | mutex_unlock(&local->iflist_mtx); | |
199 | } | |
21f83589 JB |
200 | |
201 | static void ieee80211_hw_roc_start(struct work_struct *work) | |
202 | { | |
203 | struct ieee80211_local *local = | |
204 | container_of(work, struct ieee80211_local, hw_roc_start); | |
90fc4b3a | 205 | struct ieee80211_sub_if_data *sdata; |
21f83589 JB |
206 | |
207 | mutex_lock(&local->mtx); | |
208 | ||
209 | if (!local->hw_roc_channel) { | |
210 | mutex_unlock(&local->mtx); | |
211 | return; | |
212 | } | |
213 | ||
214 | ieee80211_recalc_idle(local); | |
215 | ||
90fc4b3a JB |
216 | if (local->hw_roc_skb) { |
217 | sdata = IEEE80211_DEV_TO_SUB_IF(local->hw_roc_dev); | |
218 | ieee80211_tx_skb(sdata, local->hw_roc_skb); | |
219 | local->hw_roc_skb = NULL; | |
220 | } else { | |
221 | cfg80211_ready_on_channel(local->hw_roc_dev, | |
222 | local->hw_roc_cookie, | |
223 | local->hw_roc_channel, | |
224 | local->hw_roc_channel_type, | |
225 | local->hw_roc_duration, | |
226 | GFP_KERNEL); | |
227 | } | |
228 | ||
21f83589 JB |
229 | mutex_unlock(&local->mtx); |
230 | } | |
231 | ||
232 | void ieee80211_ready_on_channel(struct ieee80211_hw *hw) | |
233 | { | |
234 | struct ieee80211_local *local = hw_to_local(hw); | |
235 | ||
236 | trace_api_ready_on_channel(local); | |
237 | ||
238 | ieee80211_queue_work(hw, &local->hw_roc_start); | |
239 | } | |
240 | EXPORT_SYMBOL_GPL(ieee80211_ready_on_channel); | |
241 | ||
242 | static void ieee80211_hw_roc_done(struct work_struct *work) | |
243 | { | |
244 | struct ieee80211_local *local = | |
245 | container_of(work, struct ieee80211_local, hw_roc_done); | |
246 | ||
247 | mutex_lock(&local->mtx); | |
248 | ||
249 | if (!local->hw_roc_channel) { | |
250 | mutex_unlock(&local->mtx); | |
251 | return; | |
252 | } | |
253 | ||
90fc4b3a JB |
254 | if (!local->hw_roc_for_tx) |
255 | cfg80211_remain_on_channel_expired(local->hw_roc_dev, | |
256 | local->hw_roc_cookie, | |
257 | local->hw_roc_channel, | |
258 | local->hw_roc_channel_type, | |
259 | GFP_KERNEL); | |
21f83589 JB |
260 | |
261 | local->hw_roc_channel = NULL; | |
262 | local->hw_roc_cookie = 0; | |
263 | ||
264 | ieee80211_recalc_idle(local); | |
265 | ||
266 | mutex_unlock(&local->mtx); | |
267 | } | |
268 | ||
269 | void ieee80211_remain_on_channel_expired(struct ieee80211_hw *hw) | |
270 | { | |
271 | struct ieee80211_local *local = hw_to_local(hw); | |
272 | ||
273 | trace_api_remain_on_channel_expired(local); | |
274 | ||
275 | ieee80211_queue_work(hw, &local->hw_roc_done); | |
276 | } | |
277 | EXPORT_SYMBOL_GPL(ieee80211_remain_on_channel_expired); | |
278 | ||
279 | void ieee80211_hw_roc_setup(struct ieee80211_local *local) | |
280 | { | |
281 | INIT_WORK(&local->hw_roc_start, ieee80211_hw_roc_start); | |
282 | INIT_WORK(&local->hw_roc_done, ieee80211_hw_roc_done); | |
283 | } |