net/mac80211/pm.c

   1 #include <net/mac80211.h>
   2 #include <net/rtnetlink.h>
   3
   4 #include "ieee80211_i.h"
   5 #include "mesh.h"
   6 #include "driver-ops.h"
   7 #include "led.h"
   8
   9 /* return value indicates whether the driver should be further notified */
  10 static void ieee80211_quiesce(struct ieee80211_sub_if_data *sdata)
  11 {
  12         switch (sdata->vif.type) {
  13         case NL80211_IFTYPE_STATION:
  14                 ieee80211_sta_quiesce(sdata);
  15                 break;
  16         case NL80211_IFTYPE_ADHOC:
  17                 ieee80211_ibss_quiesce(sdata);
  18                 break;
  19         case NL80211_IFTYPE_MESH_POINT:
  20                 ieee80211_mesh_quiesce(sdata);
  21                 break;
  22         default:
  23                 break;
  24         }
  25
  26         cancel_work_sync(&sdata->work);
  27 }
  28
  29 int __ieee80211_suspend(struct ieee80211_hw *hw, struct cfg80211_wowlan *wowlan)
  30 {
  31         struct ieee80211_local *local = hw_to_local(hw);
  32         struct ieee80211_sub_if_data *sdata;
  33         struct sta_info *sta;
  34         struct ieee80211_chanctx *ctx;
  35
  36         if (!local->open_count)
  37                 goto suspend;
  38
  39         ieee80211_scan_cancel(local);
  40
  41         ieee80211_dfs_cac_cancel(local);
  42
  43         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
  44                 mutex_lock(&local->sta_mtx);
  45                 list_for_each_entry(sta, &local->sta_list, list) {
  46                         set_sta_flag(sta, WLAN_STA_BLOCK_BA);
  47                         ieee80211_sta_tear_down_BA_sessions(
  48                                         sta, AGG_STOP_LOCAL_REQUEST);
  49                 }
  50                 mutex_unlock(&local->sta_mtx);
  51         }
  52
  53         ieee80211_stop_queues_by_reason(hw,
  54                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
  55
  56         /* flush out all packets */
  57         synchronize_net();
  58
  59         drv_flush(local, false);
  60
  61         local->quiescing = true;
  62         /* make quiescing visible to timers everywhere */
  63         mb();
  64
  65         flush_workqueue(local->workqueue);
  66
  67         /* Don't try to run timers while suspended. */
  68         del_timer_sync(&local->sta_cleanup);
  69
  70          /*
  71          * Note that this particular timer doesn't need to be
  72          * restarted at resume.
  73          */
  74         cancel_work_sync(&local->dynamic_ps_enable_work);
  75         del_timer_sync(&local->dynamic_ps_timer);
  76
  77         local->wowlan = wowlan && local->open_count;
  78         if (local->wowlan) {
  79                 int err = drv_suspend(local, wowlan);
  80                 if (err < 0) {
  81                         local->quiescing = false;
  82                         local->wowlan = false;
  83                         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
  84                                 mutex_lock(&local->sta_mtx);
  85                                 list_for_each_entry(sta,
  86                                                     &local->sta_list, list) {
  87                                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
  88                                 }
  89                                 mutex_unlock(&local->sta_mtx);
  90                         }
  91                         ieee80211_wake_queues_by_reason(hw,
  92                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
  93                         return err;
  94                 } else if (err > 0) {
  95                         WARN_ON(err != 1);
  96                         local->wowlan = false;
  97                 } else {
  98                         list_for_each_entry(sdata, &local->interfaces, list)
  99                                 if (ieee80211_sdata_running(sdata))
 100                                         ieee80211_quiesce(sdata);
 101                         goto suspend;
 102                 }
 103         }
 104
 105         /* disable keys */
 106         list_for_each_entry(sdata, &local->interfaces, list)
 107                 ieee80211_disable_keys(sdata);
 108
 109         /* tear down aggregation sessions and remove STAs */
 110         mutex_lock(&local->sta_mtx);
 111         list_for_each_entry(sta, &local->sta_list, list) {
 112                 if (sta->uploaded) {
 113                         enum ieee80211_sta_state state;
 114
 115                         state = sta->sta_state;
 116                         for (; state > IEEE80211_STA_NOTEXIST; state--)
 117                                 WARN_ON(drv_sta_state(local, sta->sdata, sta,
 118                                                       state, state - 1));
 119                 }
 120
 121                 mesh_plink_quiesce(sta);
 122         }
 123         mutex_unlock(&local->sta_mtx);
 124
 125         /* remove all interfaces */
 126         list_for_each_entry(sdata, &local->interfaces, list) {
 127                 static u8 zero_addr[ETH_ALEN] = {};
 128                 u32 changed = 0;
 129
 130                 if (!ieee80211_sdata_running(sdata))
 131                         continue;
 132
 133                 switch (sdata->vif.type) {
 134                 case NL80211_IFTYPE_AP_VLAN:
 135                 case NL80211_IFTYPE_MONITOR:
 136                         /* skip these */
 137                         continue;
 138                 case NL80211_IFTYPE_STATION:
 139                         if (sdata->vif.bss_conf.assoc)
 140                                 changed = BSS_CHANGED_ASSOC |
 141                                           BSS_CHANGED_BSSID |
 142                                           BSS_CHANGED_IDLE;
 143                         break;
 144                 case NL80211_IFTYPE_AP:
 145                 case NL80211_IFTYPE_ADHOC:
 146                 case NL80211_IFTYPE_MESH_POINT:
 147                         if (sdata->vif.bss_conf.enable_beacon)
 148                                 changed = BSS_CHANGED_BEACON_ENABLED;
 149                         break;
 150                 default:
 151                         break;
 152                 }
 153
 154                 ieee80211_quiesce(sdata);
 155
 156                 sdata->suspend_bss_conf = sdata->vif.bss_conf;
 157                 memset(&sdata->vif.bss_conf, 0, sizeof(sdata->vif.bss_conf));
 158                 sdata->vif.bss_conf.idle = true;
 159                 if (sdata->suspend_bss_conf.bssid)
 160                         sdata->vif.bss_conf.bssid = zero_addr;
 161
 162                 /* disable beaconing or remove association */
 163                 ieee80211_bss_info_change_notify(sdata, changed);
 164
 165                 if (sdata->vif.type == NL80211_IFTYPE_AP &&
 166                     rcu_access_pointer(sdata->u.ap.beacon))
 167                         drv_stop_ap(local, sdata);
 168
 169                 if (local->use_chanctx) {
 170                         struct ieee80211_chanctx_conf *conf;
 171
 172                         mutex_lock(&local->chanctx_mtx);
 173                         conf = rcu_dereference_protected(
 174                                         sdata->vif.chanctx_conf,
 175                                         lockdep_is_held(&local->chanctx_mtx));
 176                         if (conf) {
 177                                 ctx = container_of(conf,
 178                                                    struct ieee80211_chanctx,
 179                                                    conf);
 180                                 drv_unassign_vif_chanctx(local, sdata, ctx);
 181                         }
 182
 183                         mutex_unlock(&local->chanctx_mtx);
 184                 }
 185                 drv_remove_interface(local, sdata);
 186         }
 187
 188         sdata = rtnl_dereference(local->monitor_sdata);
 189         if (sdata) {
 190                 if (local->use_chanctx) {
 191                         struct ieee80211_chanctx_conf *conf;
 192
 193                         mutex_lock(&local->chanctx_mtx);
 194                         conf = rcu_dereference_protected(
 195                                         sdata->vif.chanctx_conf,
 196                                         lockdep_is_held(&local->chanctx_mtx));
 197                         if (conf) {
 198                                 ctx = container_of(conf,
 199                                                    struct ieee80211_chanctx,
 200                                                    conf);
 201                                 drv_unassign_vif_chanctx(local, sdata, ctx);
 202                         }
 203
 204                         mutex_unlock(&local->chanctx_mtx);
 205                 }
 206
 207                 drv_remove_interface(local, sdata);
 208         }
 209
 210         mutex_lock(&local->chanctx_mtx);
 211         list_for_each_entry(ctx, &local->chanctx_list, list)
 212                 drv_remove_chanctx(local, ctx);
 213         mutex_unlock(&local->chanctx_mtx);
 214
 215         /* stop hardware - this must stop RX */
 216         if (local->open_count)
 217                 ieee80211_stop_device(local);
 218
 219  suspend:
 220         local->suspended = true;
 221         /* need suspended to be visible before quiescing is false */
 222         barrier();
 223         local->quiescing = false;
 224
 225         return 0;
 226 }
 227
 228 /*
 229  * __ieee80211_resume() is a static inline which just calls
 230  * ieee80211_reconfig(), which is also needed for hardware
 231  * hang/firmware failure/etc. recovery.
 232  */
 233
 234 void ieee80211_report_wowlan_wakeup(struct ieee80211_vif *vif,
 235                                     struct cfg80211_wowlan_wakeup *wakeup,
 236                                     gfp_t gfp)
 237 {
 238         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 239
 240         cfg80211_report_wowlan_wakeup(&sdata->wdev, wakeup, gfp);
 241 }
 242 EXPORT_SYMBOL(ieee80211_report_wowlan_wakeup);