Jouni Malinen | b203ffc | 2009-12-23 13:15:40 +0100 | [diff] [blame] | 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 | */ |
Paul Gortmaker | bc3b2d7 | 2011-07-15 11:47:34 -0400 | [diff] [blame] | 15 | #include <linux/export.h> |
Jouni Malinen | b203ffc | 2009-12-23 13:15:40 +0100 | [diff] [blame] | 16 | #include <net/mac80211.h> |
| 17 | #include "ieee80211_i.h" |
Johannes Berg | 2eb278e | 2012-06-05 14:28:42 +0200 | [diff] [blame] | 18 | #include "driver-ops.h" |
Jouni Malinen | b203ffc | 2009-12-23 13:15:40 +0100 | [diff] [blame] | 19 | |
| 20 | /* |
Ben Greear | b23b025 | 2011-02-04 11:54:17 -0800 | [diff] [blame] | 21 | * Tell our hardware to disable PS. |
| 22 | * Optionally inform AP that we will go to sleep so that it will buffer |
| 23 | * the frames while we are doing off-channel work. This is optional |
| 24 | * because we *may* be doing work on-operating channel, and want our |
| 25 | * hardware unconditionally awake, but still let the AP send us normal frames. |
Jouni Malinen | b203ffc | 2009-12-23 13:15:40 +0100 | [diff] [blame] | 26 | */ |
Rajkumar Manoharan | 559cef9 | 2012-06-18 19:03:52 +0530 | [diff] [blame] | 27 | static void ieee80211_offchannel_ps_enable(struct ieee80211_sub_if_data *sdata) |
Jouni Malinen | b203ffc | 2009-12-23 13:15:40 +0100 | [diff] [blame] | 28 | { |
| 29 | struct ieee80211_local *local = sdata->local; |
Luis R. Rodriguez | 4730d59 | 2010-09-16 15:12:31 -0400 | [diff] [blame] | 30 | struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; |
Jouni Malinen | b203ffc | 2009-12-23 13:15:40 +0100 | [diff] [blame] | 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); |
Luis R. Rodriguez | 3bc3c0d | 2010-09-16 15:12:33 -0400 | [diff] [blame] | 37 | del_timer_sync(&ifmgd->bcn_mon_timer); |
Luis R. Rodriguez | 4730d59 | 2010-09-16 15:12:31 -0400 | [diff] [blame] | 38 | del_timer_sync(&ifmgd->conn_mon_timer); |
| 39 | |
Jouni Malinen | b203ffc | 2009-12-23 13:15:40 +0100 | [diff] [blame] | 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 | |
Rajkumar Manoharan | 559cef9 | 2012-06-18 19:03:52 +0530 | [diff] [blame] | 48 | if (!local->offchannel_ps_enabled || |
| 49 | !(local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) |
Jouni Malinen | b203ffc | 2009-12-23 13:15:40 +0100 | [diff] [blame] | 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 | */ |
Ben Greear | b23b025 | 2011-02-04 11:54:17 -0800 | [diff] [blame] | 84 | /* TODO: Only set hardware if CONF_PS changed? |
| 85 | * TODO: Should we set offchannel_ps_enabled to false? |
| 86 | */ |
Jouni Malinen | b203ffc | 2009-12-23 13:15:40 +0100 | [diff] [blame] | 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 | } |
Luis R. Rodriguez | 4730d59 | 2010-09-16 15:12:31 -0400 | [diff] [blame] | 100 | |
Luis R. Rodriguez | 3bc3c0d | 2010-09-16 15:12:33 -0400 | [diff] [blame] | 101 | ieee80211_sta_reset_beacon_monitor(sdata); |
Luis R. Rodriguez | 4730d59 | 2010-09-16 15:12:31 -0400 | [diff] [blame] | 102 | ieee80211_sta_reset_conn_monitor(sdata); |
Jouni Malinen | b203ffc | 2009-12-23 13:15:40 +0100 | [diff] [blame] | 103 | } |
| 104 | |
Stanislaw Gruszka | aacde9e | 2012-12-20 14:41:18 +0100 | [diff] [blame] | 105 | void ieee80211_offchannel_stop_vifs(struct ieee80211_local *local) |
Jouni Malinen | b203ffc | 2009-12-23 13:15:40 +0100 | [diff] [blame] | 106 | { |
| 107 | struct ieee80211_sub_if_data *sdata; |
| 108 | |
Johannes Berg | fe57d9f | 2012-07-26 14:55:08 +0200 | [diff] [blame] | 109 | if (WARN_ON(local->use_chanctx)) |
| 110 | return; |
| 111 | |
Jouni Malinen | b203ffc | 2009-12-23 13:15:40 +0100 | [diff] [blame] | 112 | /* |
Ben Greear | b23b025 | 2011-02-04 11:54:17 -0800 | [diff] [blame] | 113 | * notify the AP about us leaving the channel and stop all |
| 114 | * STA interfaces. |
Jouni Malinen | b203ffc | 2009-12-23 13:15:40 +0100 | [diff] [blame] | 115 | */ |
Seth Forshee | 6c17b77 | 2013-02-11 11:21:07 -0600 | [diff] [blame] | 116 | |
Seth Forshee | 9c35d7d | 2013-02-11 11:21:08 -0600 | [diff] [blame] | 117 | /* |
| 118 | * Stop queues and transmit all frames queued by the driver |
| 119 | * before sending nullfunc to enable powersave at the AP. |
| 120 | */ |
Seth Forshee | 6c17b77 | 2013-02-11 11:21:07 -0600 | [diff] [blame] | 121 | ieee80211_stop_queues_by_reason(&local->hw, |
| 122 | IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL); |
Seth Forshee | 9c35d7d | 2013-02-11 11:21:08 -0600 | [diff] [blame] | 123 | drv_flush(local, false); |
Seth Forshee | 6c17b77 | 2013-02-11 11:21:07 -0600 | [diff] [blame] | 124 | |
Jouni Malinen | b203ffc | 2009-12-23 13:15:40 +0100 | [diff] [blame] | 125 | mutex_lock(&local->iflist_mtx); |
| 126 | list_for_each_entry(sdata, &local->interfaces, list) { |
| 127 | if (!ieee80211_sdata_running(sdata)) |
| 128 | continue; |
| 129 | |
Johannes Berg | f142c6b | 2012-06-18 20:07:15 +0200 | [diff] [blame] | 130 | if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) |
| 131 | continue; |
| 132 | |
Ben Greear | b23b025 | 2011-02-04 11:54:17 -0800 | [diff] [blame] | 133 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) |
Johannes Berg | 5b714c6 | 2010-08-27 13:45:28 +0200 | [diff] [blame] | 134 | set_bit(SDATA_STATE_OFFCHANNEL, &sdata->state); |
Ben Greear | b23b025 | 2011-02-04 11:54:17 -0800 | [diff] [blame] | 135 | |
| 136 | /* Check to see if we should disable beaconing. */ |
Johannes Berg | d6a8322 | 2012-12-14 14:06:28 +0100 | [diff] [blame] | 137 | if (sdata->vif.bss_conf.enable_beacon) { |
| 138 | set_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, |
| 139 | &sdata->state); |
| 140 | sdata->vif.bss_conf.enable_beacon = false; |
Ben Greear | b23b025 | 2011-02-04 11:54:17 -0800 | [diff] [blame] | 141 | ieee80211_bss_info_change_notify( |
| 142 | sdata, BSS_CHANGED_BEACON_ENABLED); |
Johannes Berg | d6a8322 | 2012-12-14 14:06:28 +0100 | [diff] [blame] | 143 | } |
Ben Greear | b23b025 | 2011-02-04 11:54:17 -0800 | [diff] [blame] | 144 | |
Seth Forshee | 6c17b77 | 2013-02-11 11:21:07 -0600 | [diff] [blame] | 145 | if (sdata->vif.type == NL80211_IFTYPE_STATION && |
| 146 | sdata->u.mgd.associated) |
| 147 | ieee80211_offchannel_ps_enable(sdata); |
Jouni Malinen | b203ffc | 2009-12-23 13:15:40 +0100 | [diff] [blame] | 148 | } |
| 149 | mutex_unlock(&local->iflist_mtx); |
| 150 | } |
| 151 | |
Stanislaw Gruszka | aacde9e | 2012-12-20 14:41:18 +0100 | [diff] [blame] | 152 | void ieee80211_offchannel_return(struct ieee80211_local *local) |
Jouni Malinen | b203ffc | 2009-12-23 13:15:40 +0100 | [diff] [blame] | 153 | { |
| 154 | struct ieee80211_sub_if_data *sdata; |
| 155 | |
Johannes Berg | fe57d9f | 2012-07-26 14:55:08 +0200 | [diff] [blame] | 156 | if (WARN_ON(local->use_chanctx)) |
| 157 | return; |
| 158 | |
Jouni Malinen | b203ffc | 2009-12-23 13:15:40 +0100 | [diff] [blame] | 159 | mutex_lock(&local->iflist_mtx); |
| 160 | list_for_each_entry(sdata, &local->interfaces, list) { |
Johannes Berg | f142c6b | 2012-06-18 20:07:15 +0200 | [diff] [blame] | 161 | if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) |
| 162 | continue; |
| 163 | |
Eliad Peller | f6e8cb7 | 2011-12-23 01:48:06 +0200 | [diff] [blame] | 164 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) |
| 165 | clear_bit(SDATA_STATE_OFFCHANNEL, &sdata->state); |
| 166 | |
Jouni Malinen | b203ffc | 2009-12-23 13:15:40 +0100 | [diff] [blame] | 167 | if (!ieee80211_sdata_running(sdata)) |
| 168 | continue; |
| 169 | |
| 170 | /* Tell AP we're back */ |
Stanislaw Gruszka | aacde9e | 2012-12-20 14:41:18 +0100 | [diff] [blame] | 171 | if (sdata->vif.type == NL80211_IFTYPE_STATION && |
| 172 | sdata->u.mgd.associated) |
| 173 | ieee80211_offchannel_ps_disable(sdata); |
Jouni Malinen | b203ffc | 2009-12-23 13:15:40 +0100 | [diff] [blame] | 174 | |
Johannes Berg | d6a8322 | 2012-12-14 14:06:28 +0100 | [diff] [blame] | 175 | if (test_and_clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, |
| 176 | &sdata->state)) { |
| 177 | sdata->vif.bss_conf.enable_beacon = true; |
Jouni Malinen | b203ffc | 2009-12-23 13:15:40 +0100 | [diff] [blame] | 178 | ieee80211_bss_info_change_notify( |
| 179 | sdata, BSS_CHANGED_BEACON_ENABLED); |
Johannes Berg | d6a8322 | 2012-12-14 14:06:28 +0100 | [diff] [blame] | 180 | } |
Jouni Malinen | b203ffc | 2009-12-23 13:15:40 +0100 | [diff] [blame] | 181 | } |
| 182 | mutex_unlock(&local->iflist_mtx); |
Seth Forshee | 6c17b77 | 2013-02-11 11:21:07 -0600 | [diff] [blame] | 183 | |
| 184 | ieee80211_wake_queues_by_reason(&local->hw, |
| 185 | IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL); |
Jouni Malinen | b203ffc | 2009-12-23 13:15:40 +0100 | [diff] [blame] | 186 | } |
Johannes Berg | 21f8358 | 2010-12-18 17:20:47 +0100 | [diff] [blame] | 187 | |
Johannes Berg | 2eb278e | 2012-06-05 14:28:42 +0200 | [diff] [blame] | 188 | void ieee80211_handle_roc_started(struct ieee80211_roc_work *roc) |
| 189 | { |
| 190 | if (roc->notified) |
| 191 | return; |
| 192 | |
| 193 | if (roc->mgmt_tx_cookie) { |
| 194 | if (!WARN_ON(!roc->frame)) { |
Johannes Berg | 55de908 | 2012-07-26 17:24:39 +0200 | [diff] [blame] | 195 | ieee80211_tx_skb_tid_band(roc->sdata, roc->frame, 7, |
| 196 | roc->chan->band); |
Johannes Berg | 2eb278e | 2012-06-05 14:28:42 +0200 | [diff] [blame] | 197 | roc->frame = NULL; |
| 198 | } |
| 199 | } else { |
Johannes Berg | 50febf6 | 2012-10-26 16:13:06 +0200 | [diff] [blame] | 200 | cfg80211_ready_on_channel(&roc->sdata->wdev, roc->cookie, |
Johannes Berg | 42d97a5 | 2012-11-08 18:31:02 +0100 | [diff] [blame] | 201 | roc->chan, roc->req_duration, |
| 202 | GFP_KERNEL); |
Johannes Berg | 2eb278e | 2012-06-05 14:28:42 +0200 | [diff] [blame] | 203 | } |
| 204 | |
| 205 | roc->notified = true; |
| 206 | } |
| 207 | |
Johannes Berg | 21f8358 | 2010-12-18 17:20:47 +0100 | [diff] [blame] | 208 | static void ieee80211_hw_roc_start(struct work_struct *work) |
| 209 | { |
| 210 | struct ieee80211_local *local = |
| 211 | container_of(work, struct ieee80211_local, hw_roc_start); |
Johannes Berg | 2eb278e | 2012-06-05 14:28:42 +0200 | [diff] [blame] | 212 | struct ieee80211_roc_work *roc, *dep, *tmp; |
Johannes Berg | 21f8358 | 2010-12-18 17:20:47 +0100 | [diff] [blame] | 213 | |
| 214 | mutex_lock(&local->mtx); |
| 215 | |
Johannes Berg | 2eb278e | 2012-06-05 14:28:42 +0200 | [diff] [blame] | 216 | if (list_empty(&local->roc_list)) |
| 217 | goto out_unlock; |
Johannes Berg | 21f8358 | 2010-12-18 17:20:47 +0100 | [diff] [blame] | 218 | |
Johannes Berg | 2eb278e | 2012-06-05 14:28:42 +0200 | [diff] [blame] | 219 | roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work, |
| 220 | list); |
Johannes Berg | 90fc4b3 | 2010-12-18 17:20:48 +0100 | [diff] [blame] | 221 | |
Johannes Berg | 2eb278e | 2012-06-05 14:28:42 +0200 | [diff] [blame] | 222 | if (!roc->started) |
| 223 | goto out_unlock; |
| 224 | |
| 225 | roc->hw_begun = true; |
| 226 | roc->hw_start_time = local->hw_roc_start_time; |
| 227 | |
| 228 | ieee80211_handle_roc_started(roc); |
| 229 | list_for_each_entry_safe(dep, tmp, &roc->dependents, list) { |
| 230 | ieee80211_handle_roc_started(dep); |
| 231 | |
| 232 | if (dep->duration > roc->duration) { |
| 233 | u32 dur = dep->duration; |
| 234 | dep->duration = dur - roc->duration; |
| 235 | roc->duration = dur; |
Wei Yongjun | a4ed534 | 2012-09-06 13:20:53 +0800 | [diff] [blame] | 236 | list_move(&dep->list, &roc->list); |
Johannes Berg | 2eb278e | 2012-06-05 14:28:42 +0200 | [diff] [blame] | 237 | } |
| 238 | } |
| 239 | out_unlock: |
Johannes Berg | 21f8358 | 2010-12-18 17:20:47 +0100 | [diff] [blame] | 240 | mutex_unlock(&local->mtx); |
| 241 | } |
| 242 | |
| 243 | void ieee80211_ready_on_channel(struct ieee80211_hw *hw) |
| 244 | { |
| 245 | struct ieee80211_local *local = hw_to_local(hw); |
| 246 | |
Johannes Berg | 2eb278e | 2012-06-05 14:28:42 +0200 | [diff] [blame] | 247 | local->hw_roc_start_time = jiffies; |
| 248 | |
Johannes Berg | 21f8358 | 2010-12-18 17:20:47 +0100 | [diff] [blame] | 249 | trace_api_ready_on_channel(local); |
| 250 | |
| 251 | ieee80211_queue_work(hw, &local->hw_roc_start); |
| 252 | } |
| 253 | EXPORT_SYMBOL_GPL(ieee80211_ready_on_channel); |
| 254 | |
Johannes Berg | 2eb278e | 2012-06-05 14:28:42 +0200 | [diff] [blame] | 255 | void ieee80211_start_next_roc(struct ieee80211_local *local) |
| 256 | { |
| 257 | struct ieee80211_roc_work *roc; |
| 258 | |
| 259 | lockdep_assert_held(&local->mtx); |
| 260 | |
| 261 | if (list_empty(&local->roc_list)) { |
| 262 | ieee80211_run_deferred_scan(local); |
| 263 | return; |
| 264 | } |
| 265 | |
| 266 | roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work, |
| 267 | list); |
| 268 | |
Johannes Berg | 0f6b3f5 | 2012-06-20 20:11:33 +0200 | [diff] [blame] | 269 | if (WARN_ON_ONCE(roc->started)) |
| 270 | return; |
| 271 | |
Johannes Berg | 2eb278e | 2012-06-05 14:28:42 +0200 | [diff] [blame] | 272 | if (local->ops->remain_on_channel) { |
| 273 | int ret, duration = roc->duration; |
| 274 | |
| 275 | /* XXX: duplicated, see ieee80211_start_roc_work() */ |
| 276 | if (!duration) |
| 277 | duration = 10; |
| 278 | |
Eliad Peller | 4988456 | 2012-11-19 17:05:09 +0200 | [diff] [blame] | 279 | ret = drv_remain_on_channel(local, roc->sdata, roc->chan, |
Ilan Peer | d339d5c | 2013-02-12 09:34:13 +0200 | [diff] [blame] | 280 | duration, roc->type); |
Johannes Berg | 2eb278e | 2012-06-05 14:28:42 +0200 | [diff] [blame] | 281 | |
| 282 | roc->started = true; |
| 283 | |
| 284 | if (ret) { |
| 285 | wiphy_warn(local->hw.wiphy, |
| 286 | "failed to start next HW ROC (%d)\n", ret); |
| 287 | /* |
| 288 | * queue the work struct again to avoid recursion |
| 289 | * when multiple failures occur |
| 290 | */ |
| 291 | ieee80211_remain_on_channel_expired(&local->hw); |
| 292 | } |
| 293 | } else { |
| 294 | /* delay it a bit */ |
| 295 | ieee80211_queue_delayed_work(&local->hw, &roc->work, |
| 296 | round_jiffies_relative(HZ/2)); |
| 297 | } |
| 298 | } |
| 299 | |
| 300 | void ieee80211_roc_notify_destroy(struct ieee80211_roc_work *roc) |
| 301 | { |
| 302 | struct ieee80211_roc_work *dep, *tmp; |
| 303 | |
| 304 | /* was never transmitted */ |
| 305 | if (roc->frame) { |
Johannes Berg | 71bbc99 | 2012-06-15 15:30:18 +0200 | [diff] [blame] | 306 | cfg80211_mgmt_tx_status(&roc->sdata->wdev, |
Johannes Berg | 2eb278e | 2012-06-05 14:28:42 +0200 | [diff] [blame] | 307 | (unsigned long)roc->frame, |
| 308 | roc->frame->data, roc->frame->len, |
| 309 | false, GFP_KERNEL); |
| 310 | kfree_skb(roc->frame); |
| 311 | } |
| 312 | |
| 313 | if (!roc->mgmt_tx_cookie) |
Johannes Berg | 71bbc99 | 2012-06-15 15:30:18 +0200 | [diff] [blame] | 314 | cfg80211_remain_on_channel_expired(&roc->sdata->wdev, |
Johannes Berg | 50febf6 | 2012-10-26 16:13:06 +0200 | [diff] [blame] | 315 | roc->cookie, roc->chan, |
Johannes Berg | 42d97a5 | 2012-11-08 18:31:02 +0100 | [diff] [blame] | 316 | GFP_KERNEL); |
Johannes Berg | 2eb278e | 2012-06-05 14:28:42 +0200 | [diff] [blame] | 317 | |
| 318 | list_for_each_entry_safe(dep, tmp, &roc->dependents, list) |
| 319 | ieee80211_roc_notify_destroy(dep); |
| 320 | |
| 321 | kfree(roc); |
| 322 | } |
| 323 | |
| 324 | void ieee80211_sw_roc_work(struct work_struct *work) |
| 325 | { |
| 326 | struct ieee80211_roc_work *roc = |
| 327 | container_of(work, struct ieee80211_roc_work, work.work); |
| 328 | struct ieee80211_sub_if_data *sdata = roc->sdata; |
| 329 | struct ieee80211_local *local = sdata->local; |
Alan Cox | 4b4b822 | 2012-07-13 16:14:45 +0200 | [diff] [blame] | 330 | bool started; |
Johannes Berg | 2eb278e | 2012-06-05 14:28:42 +0200 | [diff] [blame] | 331 | |
| 332 | mutex_lock(&local->mtx); |
| 333 | |
| 334 | if (roc->abort) |
| 335 | goto finish; |
| 336 | |
| 337 | if (WARN_ON(list_empty(&local->roc_list))) |
| 338 | goto out_unlock; |
| 339 | |
| 340 | if (WARN_ON(roc != list_first_entry(&local->roc_list, |
| 341 | struct ieee80211_roc_work, |
| 342 | list))) |
| 343 | goto out_unlock; |
| 344 | |
| 345 | if (!roc->started) { |
| 346 | struct ieee80211_roc_work *dep; |
| 347 | |
| 348 | /* start this ROC */ |
| 349 | |
| 350 | /* switch channel etc */ |
| 351 | ieee80211_recalc_idle(local); |
| 352 | |
| 353 | local->tmp_channel = roc->chan; |
Johannes Berg | 2eb278e | 2012-06-05 14:28:42 +0200 | [diff] [blame] | 354 | ieee80211_hw_config(local, 0); |
| 355 | |
| 356 | /* tell userspace or send frame */ |
| 357 | ieee80211_handle_roc_started(roc); |
| 358 | list_for_each_entry(dep, &roc->dependents, list) |
| 359 | ieee80211_handle_roc_started(dep); |
| 360 | |
| 361 | /* if it was pure TX, just finish right away */ |
| 362 | if (!roc->duration) |
| 363 | goto finish; |
| 364 | |
| 365 | roc->started = true; |
| 366 | ieee80211_queue_delayed_work(&local->hw, &roc->work, |
| 367 | msecs_to_jiffies(roc->duration)); |
| 368 | } else { |
| 369 | /* finish this ROC */ |
| 370 | finish: |
| 371 | list_del(&roc->list); |
Alan Cox | 4b4b822 | 2012-07-13 16:14:45 +0200 | [diff] [blame] | 372 | started = roc->started; |
Johannes Berg | 2eb278e | 2012-06-05 14:28:42 +0200 | [diff] [blame] | 373 | ieee80211_roc_notify_destroy(roc); |
| 374 | |
Alan Cox | 4b4b822 | 2012-07-13 16:14:45 +0200 | [diff] [blame] | 375 | if (started) { |
Johannes Berg | 2eb278e | 2012-06-05 14:28:42 +0200 | [diff] [blame] | 376 | drv_flush(local, false); |
| 377 | |
| 378 | local->tmp_channel = NULL; |
| 379 | ieee80211_hw_config(local, 0); |
| 380 | |
Stanislaw Gruszka | aacde9e | 2012-12-20 14:41:18 +0100 | [diff] [blame] | 381 | ieee80211_offchannel_return(local); |
Johannes Berg | 2eb278e | 2012-06-05 14:28:42 +0200 | [diff] [blame] | 382 | } |
| 383 | |
| 384 | ieee80211_recalc_idle(local); |
| 385 | |
Alan Cox | 4b4b822 | 2012-07-13 16:14:45 +0200 | [diff] [blame] | 386 | if (started) |
Johannes Berg | 0f6b3f5 | 2012-06-20 20:11:33 +0200 | [diff] [blame] | 387 | ieee80211_start_next_roc(local); |
Johannes Berg | 2eb278e | 2012-06-05 14:28:42 +0200 | [diff] [blame] | 388 | } |
| 389 | |
| 390 | out_unlock: |
| 391 | mutex_unlock(&local->mtx); |
| 392 | } |
| 393 | |
Johannes Berg | 21f8358 | 2010-12-18 17:20:47 +0100 | [diff] [blame] | 394 | static void ieee80211_hw_roc_done(struct work_struct *work) |
| 395 | { |
| 396 | struct ieee80211_local *local = |
| 397 | container_of(work, struct ieee80211_local, hw_roc_done); |
Johannes Berg | 2eb278e | 2012-06-05 14:28:42 +0200 | [diff] [blame] | 398 | struct ieee80211_roc_work *roc; |
Johannes Berg | 21f8358 | 2010-12-18 17:20:47 +0100 | [diff] [blame] | 399 | |
| 400 | mutex_lock(&local->mtx); |
| 401 | |
Johannes Berg | 2eb278e | 2012-06-05 14:28:42 +0200 | [diff] [blame] | 402 | if (list_empty(&local->roc_list)) |
| 403 | goto out_unlock; |
Johannes Berg | 21f8358 | 2010-12-18 17:20:47 +0100 | [diff] [blame] | 404 | |
Johannes Berg | 2eb278e | 2012-06-05 14:28:42 +0200 | [diff] [blame] | 405 | roc = list_first_entry(&local->roc_list, struct ieee80211_roc_work, |
| 406 | list); |
Johannes Berg | 71ecfa1 | 2012-05-31 15:09:27 +0200 | [diff] [blame] | 407 | |
Johannes Berg | 2eb278e | 2012-06-05 14:28:42 +0200 | [diff] [blame] | 408 | if (!roc->started) |
| 409 | goto out_unlock; |
Johannes Berg | 71ecfa1 | 2012-05-31 15:09:27 +0200 | [diff] [blame] | 410 | |
Johannes Berg | 2eb278e | 2012-06-05 14:28:42 +0200 | [diff] [blame] | 411 | list_del(&roc->list); |
Johannes Berg | 71ecfa1 | 2012-05-31 15:09:27 +0200 | [diff] [blame] | 412 | |
Johannes Berg | 2eb278e | 2012-06-05 14:28:42 +0200 | [diff] [blame] | 413 | ieee80211_roc_notify_destroy(roc); |
Johannes Berg | 71ecfa1 | 2012-05-31 15:09:27 +0200 | [diff] [blame] | 414 | |
Johannes Berg | 2eb278e | 2012-06-05 14:28:42 +0200 | [diff] [blame] | 415 | /* if there's another roc, start it now */ |
| 416 | ieee80211_start_next_roc(local); |
Johannes Berg | 21f8358 | 2010-12-18 17:20:47 +0100 | [diff] [blame] | 417 | |
Johannes Berg | 2eb278e | 2012-06-05 14:28:42 +0200 | [diff] [blame] | 418 | out_unlock: |
Johannes Berg | 21f8358 | 2010-12-18 17:20:47 +0100 | [diff] [blame] | 419 | mutex_unlock(&local->mtx); |
| 420 | } |
| 421 | |
| 422 | void ieee80211_remain_on_channel_expired(struct ieee80211_hw *hw) |
| 423 | { |
| 424 | struct ieee80211_local *local = hw_to_local(hw); |
| 425 | |
| 426 | trace_api_remain_on_channel_expired(local); |
| 427 | |
| 428 | ieee80211_queue_work(hw, &local->hw_roc_done); |
| 429 | } |
| 430 | EXPORT_SYMBOL_GPL(ieee80211_remain_on_channel_expired); |
| 431 | |
Johannes Berg | 2eb278e | 2012-06-05 14:28:42 +0200 | [diff] [blame] | 432 | void ieee80211_roc_setup(struct ieee80211_local *local) |
Johannes Berg | 21f8358 | 2010-12-18 17:20:47 +0100 | [diff] [blame] | 433 | { |
| 434 | INIT_WORK(&local->hw_roc_start, ieee80211_hw_roc_start); |
| 435 | INIT_WORK(&local->hw_roc_done, ieee80211_hw_roc_done); |
Johannes Berg | 2eb278e | 2012-06-05 14:28:42 +0200 | [diff] [blame] | 436 | INIT_LIST_HEAD(&local->roc_list); |
| 437 | } |
| 438 | |
| 439 | void ieee80211_roc_purge(struct ieee80211_sub_if_data *sdata) |
| 440 | { |
| 441 | struct ieee80211_local *local = sdata->local; |
| 442 | struct ieee80211_roc_work *roc, *tmp; |
| 443 | LIST_HEAD(tmp_list); |
| 444 | |
| 445 | mutex_lock(&local->mtx); |
| 446 | list_for_each_entry_safe(roc, tmp, &local->roc_list, list) { |
| 447 | if (roc->sdata != sdata) |
| 448 | continue; |
| 449 | |
| 450 | if (roc->started && local->ops->remain_on_channel) { |
| 451 | /* can race, so ignore return value */ |
| 452 | drv_cancel_remain_on_channel(local); |
| 453 | } |
| 454 | |
| 455 | list_move_tail(&roc->list, &tmp_list); |
| 456 | roc->abort = true; |
| 457 | } |
Johannes Berg | 2eb278e | 2012-06-05 14:28:42 +0200 | [diff] [blame] | 458 | mutex_unlock(&local->mtx); |
| 459 | |
| 460 | list_for_each_entry_safe(roc, tmp, &tmp_list, list) { |
| 461 | if (local->ops->remain_on_channel) { |
| 462 | list_del(&roc->list); |
| 463 | ieee80211_roc_notify_destroy(roc); |
| 464 | } else { |
| 465 | ieee80211_queue_delayed_work(&local->hw, &roc->work, 0); |
| 466 | |
| 467 | /* work will clean up etc */ |
| 468 | flush_delayed_work(&roc->work); |
| 469 | } |
| 470 | } |
| 471 | |
| 472 | WARN_ON_ONCE(!list_empty(&tmp_list)); |
Johannes Berg | 21f8358 | 2010-12-18 17:20:47 +0100 | [diff] [blame] | 473 | } |