2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/netdevice.h>
13 #include <linux/types.h>
14 #include <linux/slab.h>
15 #include <linux/skbuff.h>
16 #include <linux/if_arp.h>
17 #include <linux/timer.h>
18 #include <linux/rtnetlink.h>
20 #include <net/mac80211.h>
21 #include "ieee80211_i.h"
22 #include "driver-ops.h"
25 #include "debugfs_sta.h"
29 * DOC: STA information lifetime rules
31 * STA info structures (&struct sta_info) are managed in a hash table
32 * for faster lookup and a list for iteration. They are managed using
33 * RCU, i.e. access to the list and hash table is protected by RCU.
35 * Upon allocating a STA info structure with sta_info_alloc(), the caller
36 * owns that structure. It must then insert it into the hash table using
37 * either sta_info_insert() or sta_info_insert_rcu(); only in the latter
38 * case (which acquires an rcu read section but must not be called from
39 * within one) will the pointer still be valid after the call. Note that
40 * the caller may not do much with the STA info before inserting it, in
41 * particular, it may not start any mesh peer link management or add
44 * When the insertion fails (sta_info_insert()) returns non-zero), the
45 * structure will have been freed by sta_info_insert()!
47 * Station entries are added by mac80211 when you establish a link with a
48 * peer. This means different things for the different type of interfaces
49 * we support. For a regular station this mean we add the AP sta when we
50 * receive an assocation response from the AP. For IBSS this occurs when
51 * get to know about a peer on the same IBSS. For WDS we add the sta for
52 * the peer imediately upon device open. When using AP mode we add stations
53 * for each respective station upon request from userspace through nl80211.
55 * In order to remove a STA info structure, various sta_info_destroy_*()
56 * calls are available.
58 * There is no concept of ownership on a STA entry, each structure is
59 * owned by the global hash table/list until it is removed. All users of
60 * the structure need to be RCU protected so that the structure won't be
61 * freed before they are done using it.
64 /* Caller must hold local->sta_lock */
65 static int sta_info_hash_del(struct ieee80211_local *local,
70 s = local->sta_hash[STA_HASH(sta->sta.addr)];
74 rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)],
79 while (s->hnext && s->hnext != sta)
82 rcu_assign_pointer(s->hnext, sta->hnext);
89 /* protected by RCU */
90 struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
93 struct ieee80211_local *local = sdata->local;
96 sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
97 rcu_read_lock_held() ||
98 lockdep_is_held(&local->sta_lock) ||
99 lockdep_is_held(&local->sta_mtx));
101 if (sta->sdata == sdata &&
102 memcmp(sta->sta.addr, addr, ETH_ALEN) == 0)
104 sta = rcu_dereference_check(sta->hnext,
105 rcu_read_lock_held() ||
106 lockdep_is_held(&local->sta_lock) ||
107 lockdep_is_held(&local->sta_mtx));
113 * Get sta info either from the specified interface
114 * or from one of its vlans
116 struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
119 struct ieee80211_local *local = sdata->local;
120 struct sta_info *sta;
122 sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
123 rcu_read_lock_held() ||
124 lockdep_is_held(&local->sta_lock) ||
125 lockdep_is_held(&local->sta_mtx));
127 if ((sta->sdata == sdata ||
128 sta->sdata->bss == sdata->bss) &&
129 memcmp(sta->sta.addr, addr, ETH_ALEN) == 0)
131 sta = rcu_dereference_check(sta->hnext,
132 rcu_read_lock_held() ||
133 lockdep_is_held(&local->sta_lock) ||
134 lockdep_is_held(&local->sta_mtx));
139 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
142 struct ieee80211_local *local = sdata->local;
143 struct sta_info *sta;
146 list_for_each_entry_rcu(sta, &local->sta_list, list) {
147 if (sdata != sta->sdata)
160 * __sta_info_free - internal STA free helper
162 * @local: pointer to the global information
163 * @sta: STA info to free
165 * This function must undo everything done by sta_info_alloc()
166 * that may happen before sta_info_insert().
168 static void __sta_info_free(struct ieee80211_local *local,
169 struct sta_info *sta)
171 if (sta->rate_ctrl) {
172 rate_control_free_sta(sta);
173 rate_control_put(sta->rate_ctrl);
176 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
177 printk(KERN_DEBUG "%s: Destroyed STA %pM\n",
178 wiphy_name(local->hw.wiphy), sta->sta.addr);
179 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
184 /* Caller must hold local->sta_lock */
185 static void sta_info_hash_add(struct ieee80211_local *local,
186 struct sta_info *sta)
188 sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)];
189 rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta);
192 static void sta_unblock(struct work_struct *wk)
194 struct sta_info *sta;
196 sta = container_of(wk, struct sta_info, drv_unblock_wk);
201 if (!test_sta_flags(sta, WLAN_STA_PS_STA))
202 ieee80211_sta_ps_deliver_wakeup(sta);
203 else if (test_and_clear_sta_flags(sta, WLAN_STA_PSPOLL))
204 ieee80211_sta_ps_deliver_poll_response(sta);
207 static int sta_prepare_rate_control(struct ieee80211_local *local,
208 struct sta_info *sta, gfp_t gfp)
210 if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)
213 sta->rate_ctrl = rate_control_get(local->rate_ctrl);
214 sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
216 if (!sta->rate_ctrl_priv) {
217 rate_control_put(sta->rate_ctrl);
224 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
227 struct ieee80211_local *local = sdata->local;
228 struct sta_info *sta;
231 sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp);
235 spin_lock_init(&sta->lock);
236 spin_lock_init(&sta->flaglock);
237 INIT_WORK(&sta->drv_unblock_wk, sta_unblock);
238 INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work);
239 mutex_init(&sta->ampdu_mlme.mtx);
241 memcpy(sta->sta.addr, addr, ETH_ALEN);
245 if (sta_prepare_rate_control(local, sta, gfp)) {
250 for (i = 0; i < STA_TID_NUM; i++) {
252 * timer_to_tid must be initialized with identity mapping
253 * to enable session_timer's data differentiation. See
254 * sta_rx_agg_session_timer_expired for usage.
256 sta->timer_to_tid[i] = i;
258 skb_queue_head_init(&sta->ps_tx_buf);
259 skb_queue_head_init(&sta->tx_filtered);
261 for (i = 0; i < NUM_RX_DATA_QUEUES; i++)
262 sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX);
264 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
265 printk(KERN_DEBUG "%s: Allocated STA %pM\n",
266 wiphy_name(local->hw.wiphy), sta->sta.addr);
267 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
269 #ifdef CONFIG_MAC80211_MESH
270 sta->plink_state = PLINK_LISTEN;
271 init_timer(&sta->plink_timer);
277 static int sta_info_finish_insert(struct sta_info *sta, bool async)
279 struct ieee80211_local *local = sta->local;
280 struct ieee80211_sub_if_data *sdata = sta->sdata;
281 struct station_info sinfo;
285 WARN_ON(!mutex_is_locked(&local->sta_mtx));
288 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
289 sdata = container_of(sdata->bss,
290 struct ieee80211_sub_if_data,
292 err = drv_sta_add(local, sdata, &sta->sta);
296 printk(KERN_DEBUG "%s: failed to add IBSS STA %pM to driver (%d)"
297 " - keeping it anyway.\n",
298 sdata->name, sta->sta.addr, err);
300 sta->uploaded = true;
301 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
303 printk(KERN_DEBUG "%s: Finished adding IBSS STA %pM\n",
304 wiphy_name(local->hw.wiphy), sta->sta.addr);
312 local->sta_generation++;
315 /* make the station visible */
316 spin_lock_irqsave(&local->sta_lock, flags);
317 sta_info_hash_add(local, sta);
318 spin_unlock_irqrestore(&local->sta_lock, flags);
321 list_add(&sta->list, &local->sta_list);
323 ieee80211_sta_debugfs_add(sta);
324 rate_control_add_sta_debugfs(sta);
327 sinfo.generation = local->sta_generation;
328 cfg80211_new_sta(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL);
334 static void sta_info_finish_pending(struct ieee80211_local *local)
336 struct sta_info *sta;
339 spin_lock_irqsave(&local->sta_lock, flags);
340 while (!list_empty(&local->sta_pending_list)) {
341 sta = list_first_entry(&local->sta_pending_list,
342 struct sta_info, list);
343 list_del(&sta->list);
344 spin_unlock_irqrestore(&local->sta_lock, flags);
346 sta_info_finish_insert(sta, true);
348 spin_lock_irqsave(&local->sta_lock, flags);
350 spin_unlock_irqrestore(&local->sta_lock, flags);
353 static void sta_info_finish_work(struct work_struct *work)
355 struct ieee80211_local *local =
356 container_of(work, struct ieee80211_local, sta_finish_work);
358 mutex_lock(&local->sta_mtx);
359 sta_info_finish_pending(local);
360 mutex_unlock(&local->sta_mtx);
363 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU)
365 struct ieee80211_local *local = sta->local;
366 struct ieee80211_sub_if_data *sdata = sta->sdata;
371 * Can't be a WARN_ON because it can be triggered through a race:
372 * something inserts a STA (on one CPU) without holding the RTNL
373 * and another CPU turns off the net device.
375 if (unlikely(!ieee80211_sdata_running(sdata))) {
381 if (WARN_ON(compare_ether_addr(sta->sta.addr, sdata->vif.addr) == 0 ||
382 is_multicast_ether_addr(sta->sta.addr))) {
389 * In ad-hoc mode, we sometimes need to insert stations
390 * from tasklet context from the RX path. To avoid races,
391 * always do so in that case -- see the comment below.
393 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
394 spin_lock_irqsave(&local->sta_lock, flags);
395 /* check if STA exists already */
396 if (sta_info_get_bss(sdata, sta->sta.addr)) {
397 spin_unlock_irqrestore(&local->sta_lock, flags);
404 local->sta_generation++;
406 sta_info_hash_add(local, sta);
408 list_add_tail(&sta->list, &local->sta_pending_list);
411 spin_unlock_irqrestore(&local->sta_lock, flags);
413 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
414 printk(KERN_DEBUG "%s: Added IBSS STA %pM\n",
415 wiphy_name(local->hw.wiphy), sta->sta.addr);
416 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
418 ieee80211_queue_work(&local->hw, &local->sta_finish_work);
424 * On first glance, this will look racy, because the code
425 * below this point, which inserts a station with sleeping,
426 * unlocks the sta_lock between checking existence in the
427 * hash table and inserting into it.
429 * However, it is not racy against itself because it keeps
430 * the mutex locked. It still seems to race against the
431 * above code that atomically inserts the station... That,
432 * however, is not true because the above code can only
433 * be invoked for IBSS interfaces, and the below code will
434 * not be -- and the two do not race against each other as
435 * the hash table also keys off the interface.
440 mutex_lock(&local->sta_mtx);
442 spin_lock_irqsave(&local->sta_lock, flags);
443 /* check if STA exists already */
444 if (sta_info_get_bss(sdata, sta->sta.addr)) {
445 spin_unlock_irqrestore(&local->sta_lock, flags);
446 mutex_unlock(&local->sta_mtx);
452 spin_unlock_irqrestore(&local->sta_lock, flags);
454 err = sta_info_finish_insert(sta, false);
456 mutex_unlock(&local->sta_mtx);
461 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
462 printk(KERN_DEBUG "%s: Inserted STA %pM\n",
463 wiphy_name(local->hw.wiphy), sta->sta.addr);
464 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
466 /* move reference to rcu-protected */
468 mutex_unlock(&local->sta_mtx);
470 if (ieee80211_vif_is_mesh(&sdata->vif))
471 mesh_accept_plinks_update(sdata);
476 __sta_info_free(local, sta);
480 int sta_info_insert(struct sta_info *sta)
482 int err = sta_info_insert_rcu(sta);
489 static inline void __bss_tim_set(struct ieee80211_if_ap *bss, u16 aid)
492 * This format has been mandated by the IEEE specifications,
493 * so this line may not be changed to use the __set_bit() format.
495 bss->tim[aid / 8] |= (1 << (aid % 8));
498 static inline void __bss_tim_clear(struct ieee80211_if_ap *bss, u16 aid)
501 * This format has been mandated by the IEEE specifications,
502 * so this line may not be changed to use the __clear_bit() format.
504 bss->tim[aid / 8] &= ~(1 << (aid % 8));
507 static void __sta_info_set_tim_bit(struct ieee80211_if_ap *bss,
508 struct sta_info *sta)
512 __bss_tim_set(bss, sta->sta.aid);
514 if (sta->local->ops->set_tim) {
515 sta->local->tim_in_locked_section = true;
516 drv_set_tim(sta->local, &sta->sta, true);
517 sta->local->tim_in_locked_section = false;
521 void sta_info_set_tim_bit(struct sta_info *sta)
525 BUG_ON(!sta->sdata->bss);
527 spin_lock_irqsave(&sta->local->sta_lock, flags);
528 __sta_info_set_tim_bit(sta->sdata->bss, sta);
529 spin_unlock_irqrestore(&sta->local->sta_lock, flags);
532 static void __sta_info_clear_tim_bit(struct ieee80211_if_ap *bss,
533 struct sta_info *sta)
537 __bss_tim_clear(bss, sta->sta.aid);
539 if (sta->local->ops->set_tim) {
540 sta->local->tim_in_locked_section = true;
541 drv_set_tim(sta->local, &sta->sta, false);
542 sta->local->tim_in_locked_section = false;
546 void sta_info_clear_tim_bit(struct sta_info *sta)
550 BUG_ON(!sta->sdata->bss);
552 spin_lock_irqsave(&sta->local->sta_lock, flags);
553 __sta_info_clear_tim_bit(sta->sdata->bss, sta);
554 spin_unlock_irqrestore(&sta->local->sta_lock, flags);
557 static int sta_info_buffer_expired(struct sta_info *sta,
560 struct ieee80211_tx_info *info;
566 info = IEEE80211_SKB_CB(skb);
568 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
569 timeout = (sta->listen_interval *
570 sta->sdata->vif.bss_conf.beacon_int *
572 if (timeout < STA_TX_BUFFER_EXPIRE)
573 timeout = STA_TX_BUFFER_EXPIRE;
574 return time_after(jiffies, info->control.jiffies + timeout);
578 static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
579 struct sta_info *sta)
583 struct ieee80211_sub_if_data *sdata;
585 if (skb_queue_empty(&sta->ps_tx_buf))
589 spin_lock_irqsave(&sta->ps_tx_buf.lock, flags);
590 skb = skb_peek(&sta->ps_tx_buf);
591 if (sta_info_buffer_expired(sta, skb))
592 skb = __skb_dequeue(&sta->ps_tx_buf);
595 spin_unlock_irqrestore(&sta->ps_tx_buf.lock, flags);
601 local->total_ps_buffered--;
602 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
603 printk(KERN_DEBUG "Buffered frame expired (STA %pM)\n",
608 if (skb_queue_empty(&sta->ps_tx_buf))
609 sta_info_clear_tim_bit(sta);
615 static int __must_check __sta_info_destroy(struct sta_info *sta)
617 struct ieee80211_local *local;
618 struct ieee80211_sub_if_data *sdata;
632 * Before removing the station from the driver and
633 * rate control, it might still start new aggregation
634 * sessions -- block that to make sure the tear-down
635 * will be sufficient.
637 set_sta_flags(sta, WLAN_STA_BLOCK_BA);
638 ieee80211_sta_tear_down_BA_sessions(sta);
640 spin_lock_irqsave(&local->sta_lock, flags);
641 ret = sta_info_hash_del(local, sta);
642 /* this might still be the pending list ... which is fine */
644 list_del(&sta->list);
645 spin_unlock_irqrestore(&local->sta_lock, flags);
650 ieee80211_key_free(local, sta->key);
656 if (test_and_clear_sta_flags(sta,
657 WLAN_STA_PS_STA | WLAN_STA_PS_DRIVER)) {
660 atomic_dec(&sdata->bss->num_sta_ps);
661 __sta_info_clear_tim_bit(sdata->bss, sta);
665 local->sta_generation++;
667 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
668 rcu_assign_pointer(sdata->u.vlan.sta, NULL);
671 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
672 sdata = container_of(sdata->bss,
673 struct ieee80211_sub_if_data,
675 drv_sta_remove(local, sdata, &sta->sta);
680 * At this point, after we wait for an RCU grace period,
681 * neither mac80211 nor the driver can reference this
682 * sta struct any more except by still existing timers
683 * associated with this station that we clean up below.
687 #ifdef CONFIG_MAC80211_MESH
688 if (ieee80211_vif_is_mesh(&sdata->vif))
689 mesh_accept_plinks_update(sdata);
692 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
693 printk(KERN_DEBUG "%s: Removed STA %pM\n",
694 wiphy_name(local->hw.wiphy), sta->sta.addr);
695 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
696 cancel_work_sync(&sta->drv_unblock_wk);
698 rate_control_remove_sta_debugfs(sta);
699 ieee80211_sta_debugfs_remove(sta);
701 #ifdef CONFIG_MAC80211_MESH
702 if (ieee80211_vif_is_mesh(&sta->sdata->vif)) {
703 mesh_plink_deactivate(sta);
704 del_timer_sync(&sta->plink_timer);
708 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
709 local->total_ps_buffered--;
710 dev_kfree_skb_any(skb);
713 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL)
714 dev_kfree_skb_any(skb);
716 __sta_info_free(local, sta);
721 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr)
723 struct sta_info *sta;
726 mutex_lock(&sdata->local->sta_mtx);
727 sta = sta_info_get(sdata, addr);
728 ret = __sta_info_destroy(sta);
729 mutex_unlock(&sdata->local->sta_mtx);
734 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
737 struct sta_info *sta;
740 mutex_lock(&sdata->local->sta_mtx);
741 sta = sta_info_get_bss(sdata, addr);
742 ret = __sta_info_destroy(sta);
743 mutex_unlock(&sdata->local->sta_mtx);
748 static void sta_info_cleanup(unsigned long data)
750 struct ieee80211_local *local = (struct ieee80211_local *) data;
751 struct sta_info *sta;
752 bool timer_needed = false;
755 list_for_each_entry_rcu(sta, &local->sta_list, list)
756 if (sta_info_cleanup_expire_buffered(local, sta))
760 if (local->quiescing)
766 local->sta_cleanup.expires =
767 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL);
768 add_timer(&local->sta_cleanup);
771 void sta_info_init(struct ieee80211_local *local)
773 spin_lock_init(&local->sta_lock);
774 mutex_init(&local->sta_mtx);
775 INIT_LIST_HEAD(&local->sta_list);
776 INIT_LIST_HEAD(&local->sta_pending_list);
777 INIT_WORK(&local->sta_finish_work, sta_info_finish_work);
779 setup_timer(&local->sta_cleanup, sta_info_cleanup,
780 (unsigned long)local);
781 local->sta_cleanup.expires =
782 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL);
785 int sta_info_start(struct ieee80211_local *local)
787 add_timer(&local->sta_cleanup);
791 void sta_info_stop(struct ieee80211_local *local)
793 del_timer(&local->sta_cleanup);
794 sta_info_flush(local, NULL);
798 * sta_info_flush - flush matching STA entries from the STA table
800 * Returns the number of removed STA entries.
802 * @local: local interface data
803 * @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs
805 int sta_info_flush(struct ieee80211_local *local,
806 struct ieee80211_sub_if_data *sdata)
808 struct sta_info *sta, *tmp;
813 mutex_lock(&local->sta_mtx);
815 sta_info_finish_pending(local);
817 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
818 if (!sdata || sdata == sta->sdata)
819 WARN_ON(__sta_info_destroy(sta));
821 mutex_unlock(&local->sta_mtx);
826 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
827 unsigned long exp_time)
829 struct ieee80211_local *local = sdata->local;
830 struct sta_info *sta, *tmp;
832 mutex_lock(&local->sta_mtx);
833 list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
834 if (time_after(jiffies, sta->last_rx + exp_time)) {
835 #ifdef CONFIG_MAC80211_IBSS_DEBUG
836 printk(KERN_DEBUG "%s: expiring inactive STA %pM\n",
837 sdata->name, sta->sta.addr);
839 WARN_ON(__sta_info_destroy(sta));
841 mutex_unlock(&local->sta_mtx);
844 struct ieee80211_sta *ieee80211_find_sta_by_hw(struct ieee80211_hw *hw,
847 struct sta_info *sta, *nxt;
849 /* Just return a random station ... first in list ... */
850 for_each_sta_info(hw_to_local(hw), addr, sta, nxt) {
858 EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_hw);
860 struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif,
863 struct sta_info *sta;
868 sta = sta_info_get_bss(vif_to_sdata(vif), addr);
877 EXPORT_SYMBOL(ieee80211_find_sta);
879 /* powersave support code */
880 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
882 struct ieee80211_sub_if_data *sdata = sta->sdata;
883 struct ieee80211_local *local = sdata->local;
886 drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta);
888 if (!skb_queue_empty(&sta->ps_tx_buf))
889 sta_info_clear_tim_bit(sta);
891 /* Send all buffered frames to the station */
892 sent = ieee80211_add_pending_skbs(local, &sta->tx_filtered);
893 buffered = ieee80211_add_pending_skbs(local, &sta->ps_tx_buf);
895 local->total_ps_buffered -= buffered;
897 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
898 printk(KERN_DEBUG "%s: STA %pM aid %d sending %d filtered/%d PS frames "
899 "since STA not sleeping anymore\n", sdata->name,
900 sta->sta.addr, sta->sta.aid, sent - buffered, buffered);
901 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
904 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
906 struct ieee80211_sub_if_data *sdata = sta->sdata;
907 struct ieee80211_local *local = sdata->local;
911 skb = skb_dequeue(&sta->tx_filtered);
913 skb = skb_dequeue(&sta->ps_tx_buf);
915 local->total_ps_buffered--;
917 no_pending_pkts = skb_queue_empty(&sta->tx_filtered) &&
918 skb_queue_empty(&sta->ps_tx_buf);
921 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
922 struct ieee80211_hdr *hdr =
923 (struct ieee80211_hdr *) skb->data;
926 * Tell TX path to send this frame even though the STA may
927 * still remain is PS mode after this frame exchange.
929 info->flags |= IEEE80211_TX_CTL_PSPOLL_RESPONSE;
931 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
932 printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n",
933 sta->sta.addr, sta->sta.aid,
934 skb_queue_len(&sta->ps_tx_buf));
935 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
937 /* Use MoreData flag to indicate whether there are more
938 * buffered frames for this STA */
940 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
942 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
944 ieee80211_add_pending_skb(local, skb);
947 sta_info_clear_tim_bit(sta);
948 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
951 * FIXME: This can be the result of a race condition between
952 * us expiring a frame and the station polling for it.
953 * Should we send it a null-func frame indicating we
954 * have nothing buffered for it?
956 printk(KERN_DEBUG "%s: STA %pM sent PS Poll even "
957 "though there are no buffered frames for it\n",
958 sdata->name, sta->sta.addr);
959 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
963 void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
964 struct ieee80211_sta *pubsta, bool block)
966 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
968 trace_api_sta_block_awake(sta->local, pubsta, block);
971 set_sta_flags(sta, WLAN_STA_PS_DRIVER);
973 ieee80211_queue_work(hw, &sta->drv_unblock_wk);
975 EXPORT_SYMBOL(ieee80211_sta_block_awake);