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/etherdevice.h>
13 #include <linux/netdevice.h>
14 #include <linux/types.h>
15 #include <linux/slab.h>
16 #include <linux/skbuff.h>
17 #include <linux/if_arp.h>
18 #include <linux/timer.h>
19 #include <linux/rtnetlink.h>
21 #include <net/mac80211.h>
22 #include "ieee80211_i.h"
23 #include "driver-ops.h"
26 #include "debugfs_sta.h"
31 * DOC: STA information lifetime rules
33 * STA info structures (&struct sta_info) are managed in a hash table
34 * for faster lookup and a list for iteration. They are managed using
35 * RCU, i.e. access to the list and hash table is protected by RCU.
37 * Upon allocating a STA info structure with sta_info_alloc(), the caller
38 * owns that structure. It must then insert it into the hash table using
39 * either sta_info_insert() or sta_info_insert_rcu(); only in the latter
40 * case (which acquires an rcu read section but must not be called from
41 * within one) will the pointer still be valid after the call. Note that
42 * the caller may not do much with the STA info before inserting it, in
43 * particular, it may not start any mesh peer link management or add
46 * When the insertion fails (sta_info_insert()) returns non-zero), the
47 * structure will have been freed by sta_info_insert()!
49 * Station entries are added by mac80211 when you establish a link with a
50 * peer. This means different things for the different type of interfaces
51 * we support. For a regular station this mean we add the AP sta when we
52 * receive an association response from the AP. For IBSS this occurs when
53 * get to know about a peer on the same IBSS. For WDS we add the sta for
54 * the peer immediately upon device open. When using AP mode we add stations
55 * for each respective station upon request from userspace through nl80211.
57 * In order to remove a STA info structure, various sta_info_destroy_*()
58 * calls are available.
60 * There is no concept of ownership on a STA entry, each structure is
61 * owned by the global hash table/list until it is removed. All users of
62 * the structure need to be RCU protected so that the structure won't be
63 * freed before they are done using it.
66 /* Caller must hold local->sta_mtx */
67 static int sta_info_hash_del(struct ieee80211_local *local,
72 s = rcu_dereference_protected(local->sta_hash[STA_HASH(sta->sta.addr)],
73 lockdep_is_held(&local->sta_mtx));
77 rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)],
82 while (rcu_access_pointer(s->hnext) &&
83 rcu_access_pointer(s->hnext) != sta)
84 s = rcu_dereference_protected(s->hnext,
85 lockdep_is_held(&local->sta_mtx));
86 if (rcu_access_pointer(s->hnext)) {
87 rcu_assign_pointer(s->hnext, sta->hnext);
94 static void cleanup_single_sta(struct sta_info *sta)
97 struct tid_ampdu_tx *tid_tx;
98 struct ieee80211_sub_if_data *sdata = sta->sdata;
99 struct ieee80211_local *local = sdata->local;
102 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
103 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
104 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
105 ps = &sdata->bss->ps;
106 else if (ieee80211_vif_is_mesh(&sdata->vif))
107 ps = &sdata->u.mesh.ps;
111 clear_sta_flag(sta, WLAN_STA_PS_STA);
113 atomic_dec(&ps->num_sta_ps);
114 sta_info_recalc_tim(sta);
117 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
118 local->total_ps_buffered -= skb_queue_len(&sta->ps_tx_buf[ac]);
119 ieee80211_purge_tx_queue(&local->hw, &sta->ps_tx_buf[ac]);
120 ieee80211_purge_tx_queue(&local->hw, &sta->tx_filtered[ac]);
123 if (ieee80211_vif_is_mesh(&sdata->vif))
124 mesh_sta_cleanup(sta);
126 cancel_work_sync(&sta->drv_unblock_wk);
129 * Destroy aggregation state here. It would be nice to wait for the
130 * driver to finish aggregation stop and then clean up, but for now
131 * drivers have to handle aggregation stop being requested, followed
132 * directly by station destruction.
134 for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
135 kfree(sta->ampdu_mlme.tid_start_tx[i]);
136 tid_tx = rcu_dereference_raw(sta->ampdu_mlme.tid_tx[i]);
139 ieee80211_purge_tx_queue(&local->hw, &tid_tx->pending);
143 sta_info_free(local, sta);
146 /* protected by RCU */
147 struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
150 struct ieee80211_local *local = sdata->local;
151 struct sta_info *sta;
153 sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
154 lockdep_is_held(&local->sta_mtx));
156 if (sta->sdata == sdata &&
157 ether_addr_equal(sta->sta.addr, addr))
159 sta = rcu_dereference_check(sta->hnext,
160 lockdep_is_held(&local->sta_mtx));
166 * Get sta info either from the specified interface
167 * or from one of its vlans
169 struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
172 struct ieee80211_local *local = sdata->local;
173 struct sta_info *sta;
175 sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
176 lockdep_is_held(&local->sta_mtx));
178 if ((sta->sdata == sdata ||
179 (sta->sdata->bss && sta->sdata->bss == sdata->bss)) &&
180 ether_addr_equal(sta->sta.addr, addr))
182 sta = rcu_dereference_check(sta->hnext,
183 lockdep_is_held(&local->sta_mtx));
188 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
191 struct ieee80211_local *local = sdata->local;
192 struct sta_info *sta;
195 list_for_each_entry_rcu(sta, &local->sta_list, list) {
196 if (sdata != sta->sdata)
209 * sta_info_free - free STA
211 * @local: pointer to the global information
212 * @sta: STA info to free
214 * This function must undo everything done by sta_info_alloc()
215 * that may happen before sta_info_insert(). It may only be
216 * called when sta_info_insert() has not been attempted (and
217 * if that fails, the station is freed anyway.)
219 void sta_info_free(struct ieee80211_local *local, struct sta_info *sta)
224 rate_control_free_sta(sta);
227 for (i = 0; i < IEEE80211_NUM_TIDS; i++)
228 kfree(sta->tx_lat[i].bins);
232 sta_dbg(sta->sdata, "Destroyed STA %pM\n", sta->sta.addr);
237 /* Caller must hold local->sta_mtx */
238 static void sta_info_hash_add(struct ieee80211_local *local,
239 struct sta_info *sta)
241 lockdep_assert_held(&local->sta_mtx);
242 sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)];
243 rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta);
246 static void sta_unblock(struct work_struct *wk)
248 struct sta_info *sta;
250 sta = container_of(wk, struct sta_info, drv_unblock_wk);
255 if (!test_sta_flag(sta, WLAN_STA_PS_STA)) {
257 ieee80211_sta_ps_deliver_wakeup(sta);
259 } else if (test_and_clear_sta_flag(sta, WLAN_STA_PSPOLL)) {
260 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
263 ieee80211_sta_ps_deliver_poll_response(sta);
265 } else if (test_and_clear_sta_flag(sta, WLAN_STA_UAPSD)) {
266 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
269 ieee80211_sta_ps_deliver_uapsd(sta);
272 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
275 static int sta_prepare_rate_control(struct ieee80211_local *local,
276 struct sta_info *sta, gfp_t gfp)
278 if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)
281 sta->rate_ctrl = local->rate_ctrl;
282 sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
284 if (!sta->rate_ctrl_priv)
290 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
291 const u8 *addr, gfp_t gfp)
293 struct ieee80211_local *local = sdata->local;
294 struct sta_info *sta;
295 struct timespec uptime;
296 struct ieee80211_tx_latency_bin_ranges *tx_latency;
299 sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp);
304 tx_latency = rcu_dereference(local->tx_latency);
305 /* init stations Tx latency statistics && TID bins */
307 sta->tx_lat = kzalloc(IEEE80211_NUM_TIDS *
308 sizeof(struct ieee80211_tx_latency_stat),
315 if (tx_latency->n_ranges) {
316 for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
317 /* size of bins is size of the ranges +1 */
318 sta->tx_lat[i].bin_count =
319 tx_latency->n_ranges + 1;
320 sta->tx_lat[i].bins =
321 kcalloc(sta->tx_lat[i].bin_count,
322 sizeof(u32), GFP_ATOMIC);
323 if (!sta->tx_lat[i].bins) {
332 spin_lock_init(&sta->lock);
333 spin_lock_init(&sta->ps_lock);
334 INIT_WORK(&sta->drv_unblock_wk, sta_unblock);
335 INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work);
336 mutex_init(&sta->ampdu_mlme.mtx);
337 #ifdef CONFIG_MAC80211_MESH
338 if (ieee80211_vif_is_mesh(&sdata->vif) &&
339 !sdata->u.mesh.user_mpm)
340 init_timer(&sta->plink_timer);
341 sta->nonpeer_pm = NL80211_MESH_POWER_ACTIVE;
344 memcpy(sta->sta.addr, addr, ETH_ALEN);
347 sta->last_rx = jiffies;
349 sta->sta_state = IEEE80211_STA_NONE;
351 do_posix_clock_monotonic_gettime(&uptime);
352 sta->last_connected = uptime.tv_sec;
353 ewma_init(&sta->avg_signal, 1024, 8);
354 for (i = 0; i < ARRAY_SIZE(sta->chain_signal_avg); i++)
355 ewma_init(&sta->chain_signal_avg[i], 1024, 8);
357 if (sta_prepare_rate_control(local, sta, gfp))
360 for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
362 * timer_to_tid must be initialized with identity mapping
363 * to enable session_timer's data differentiation. See
364 * sta_rx_agg_session_timer_expired for usage.
366 sta->timer_to_tid[i] = i;
368 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
369 skb_queue_head_init(&sta->ps_tx_buf[i]);
370 skb_queue_head_init(&sta->tx_filtered[i]);
373 for (i = 0; i < IEEE80211_NUM_TIDS; i++)
374 sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX);
376 sta->sta.smps_mode = IEEE80211_SMPS_OFF;
377 if (sdata->vif.type == NL80211_IFTYPE_AP ||
378 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
379 struct ieee80211_supported_band *sband =
380 local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
381 u8 smps = (sband->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >>
382 IEEE80211_HT_CAP_SM_PS_SHIFT;
384 * Assume that hostapd advertises our caps in the beacon and
385 * this is the known_smps_mode for a station that just assciated
388 case WLAN_HT_SMPS_CONTROL_DISABLED:
389 sta->known_smps_mode = IEEE80211_SMPS_OFF;
391 case WLAN_HT_SMPS_CONTROL_STATIC:
392 sta->known_smps_mode = IEEE80211_SMPS_STATIC;
394 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
395 sta->known_smps_mode = IEEE80211_SMPS_DYNAMIC;
402 sta_dbg(sdata, "Allocated STA %pM\n", sta->sta.addr);
407 for (i = 0; i < IEEE80211_NUM_TIDS; i++)
408 kfree(sta->tx_lat[i].bins);
415 static int sta_info_insert_check(struct sta_info *sta)
417 struct ieee80211_sub_if_data *sdata = sta->sdata;
420 * Can't be a WARN_ON because it can be triggered through a race:
421 * something inserts a STA (on one CPU) without holding the RTNL
422 * and another CPU turns off the net device.
424 if (unlikely(!ieee80211_sdata_running(sdata)))
427 if (WARN_ON(ether_addr_equal(sta->sta.addr, sdata->vif.addr) ||
428 is_multicast_ether_addr(sta->sta.addr)))
434 static int sta_info_insert_drv_state(struct ieee80211_local *local,
435 struct ieee80211_sub_if_data *sdata,
436 struct sta_info *sta)
438 enum ieee80211_sta_state state;
441 for (state = IEEE80211_STA_NOTEXIST; state < sta->sta_state; state++) {
442 err = drv_sta_state(local, sdata, sta, state, state + 1);
449 * Drivers using legacy sta_add/sta_remove callbacks only
450 * get uploaded set to true after sta_add is called.
452 if (!local->ops->sta_add)
453 sta->uploaded = true;
457 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
459 "failed to move IBSS STA %pM to state %d (%d) - keeping it anyway\n",
460 sta->sta.addr, state + 1, err);
464 /* unwind on error */
465 for (; state > IEEE80211_STA_NOTEXIST; state--)
466 WARN_ON(drv_sta_state(local, sdata, sta, state, state - 1));
472 * should be called with sta_mtx locked
473 * this function replaces the mutex lock
476 static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU)
478 struct ieee80211_local *local = sta->local;
479 struct ieee80211_sub_if_data *sdata = sta->sdata;
480 struct station_info sinfo;
483 lockdep_assert_held(&local->sta_mtx);
485 /* check if STA exists already */
486 if (sta_info_get_bss(sdata, sta->sta.addr)) {
492 err = sta_info_insert_drv_state(local, sdata, sta);
497 local->sta_generation++;
500 /* make the station visible */
501 sta_info_hash_add(local, sta);
503 list_add_rcu(&sta->list, &local->sta_list);
505 set_sta_flag(sta, WLAN_STA_INSERTED);
507 ieee80211_recalc_min_chandef(sdata);
508 ieee80211_sta_debugfs_add(sta);
509 rate_control_add_sta_debugfs(sta);
511 memset(&sinfo, 0, sizeof(sinfo));
513 sinfo.generation = local->sta_generation;
514 cfg80211_new_sta(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL);
516 sta_dbg(sdata, "Inserted STA %pM\n", sta->sta.addr);
518 /* move reference to rcu-protected */
520 mutex_unlock(&local->sta_mtx);
522 if (ieee80211_vif_is_mesh(&sdata->vif))
523 mesh_accept_plinks_update(sdata);
527 mutex_unlock(&local->sta_mtx);
532 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU)
534 struct ieee80211_local *local = sta->local;
539 err = sta_info_insert_check(sta);
545 mutex_lock(&local->sta_mtx);
547 err = sta_info_insert_finish(sta);
554 sta_info_free(local, sta);
558 int sta_info_insert(struct sta_info *sta)
560 int err = sta_info_insert_rcu(sta);
567 static inline void __bss_tim_set(u8 *tim, u16 id)
570 * This format has been mandated by the IEEE specifications,
571 * so this line may not be changed to use the __set_bit() format.
573 tim[id / 8] |= (1 << (id % 8));
576 static inline void __bss_tim_clear(u8 *tim, u16 id)
579 * This format has been mandated by the IEEE specifications,
580 * so this line may not be changed to use the __clear_bit() format.
582 tim[id / 8] &= ~(1 << (id % 8));
585 static inline bool __bss_tim_get(u8 *tim, u16 id)
588 * This format has been mandated by the IEEE specifications,
589 * so this line may not be changed to use the test_bit() format.
591 return tim[id / 8] & (1 << (id % 8));
594 static unsigned long ieee80211_tids_for_ac(int ac)
596 /* If we ever support TIDs > 7, this obviously needs to be adjusted */
598 case IEEE80211_AC_VO:
599 return BIT(6) | BIT(7);
600 case IEEE80211_AC_VI:
601 return BIT(4) | BIT(5);
602 case IEEE80211_AC_BE:
603 return BIT(0) | BIT(3);
604 case IEEE80211_AC_BK:
605 return BIT(1) | BIT(2);
612 void sta_info_recalc_tim(struct sta_info *sta)
614 struct ieee80211_local *local = sta->local;
616 bool indicate_tim = false;
617 u8 ignore_for_tim = sta->sta.uapsd_queues;
621 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
622 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
623 if (WARN_ON_ONCE(!sta->sdata->bss))
626 ps = &sta->sdata->bss->ps;
628 #ifdef CONFIG_MAC80211_MESH
629 } else if (ieee80211_vif_is_mesh(&sta->sdata->vif)) {
630 ps = &sta->sdata->u.mesh.ps;
631 /* TIM map only for 1 <= PLID <= IEEE80211_MAX_AID */
632 id = sta->plid % (IEEE80211_MAX_AID + 1);
638 /* No need to do anything if the driver does all */
639 if (local->hw.flags & IEEE80211_HW_AP_LINK_PS)
646 * If all ACs are delivery-enabled then we should build
647 * the TIM bit for all ACs anyway; if only some are then
648 * we ignore those and build the TIM bit using only the
651 if (ignore_for_tim == BIT(IEEE80211_NUM_ACS) - 1)
654 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
657 if (ignore_for_tim & BIT(ac))
660 indicate_tim |= !skb_queue_empty(&sta->tx_filtered[ac]) ||
661 !skb_queue_empty(&sta->ps_tx_buf[ac]);
665 tids = ieee80211_tids_for_ac(ac);
668 sta->driver_buffered_tids & tids;
672 spin_lock_bh(&local->tim_lock);
674 if (indicate_tim == __bss_tim_get(ps->tim, id))
678 __bss_tim_set(ps->tim, id);
680 __bss_tim_clear(ps->tim, id);
682 if (local->ops->set_tim) {
683 local->tim_in_locked_section = true;
684 drv_set_tim(local, &sta->sta, indicate_tim);
685 local->tim_in_locked_section = false;
689 spin_unlock_bh(&local->tim_lock);
692 static bool sta_info_buffer_expired(struct sta_info *sta, struct sk_buff *skb)
694 struct ieee80211_tx_info *info;
700 info = IEEE80211_SKB_CB(skb);
702 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
703 timeout = (sta->listen_interval *
704 sta->sdata->vif.bss_conf.beacon_int *
706 if (timeout < STA_TX_BUFFER_EXPIRE)
707 timeout = STA_TX_BUFFER_EXPIRE;
708 return time_after(jiffies, info->control.jiffies + timeout);
712 static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local *local,
713 struct sta_info *sta, int ac)
719 * First check for frames that should expire on the filtered
720 * queue. Frames here were rejected by the driver and are on
721 * a separate queue to avoid reordering with normal PS-buffered
722 * frames. They also aren't accounted for right now in the
723 * total_ps_buffered counter.
726 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
727 skb = skb_peek(&sta->tx_filtered[ac]);
728 if (sta_info_buffer_expired(sta, skb))
729 skb = __skb_dequeue(&sta->tx_filtered[ac]);
732 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
735 * Frames are queued in order, so if this one
736 * hasn't expired yet we can stop testing. If
737 * we actually reached the end of the queue we
738 * also need to stop, of course.
742 ieee80211_free_txskb(&local->hw, skb);
746 * Now also check the normal PS-buffered queue, this will
747 * only find something if the filtered queue was emptied
748 * since the filtered frames are all before the normal PS
752 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
753 skb = skb_peek(&sta->ps_tx_buf[ac]);
754 if (sta_info_buffer_expired(sta, skb))
755 skb = __skb_dequeue(&sta->ps_tx_buf[ac]);
758 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
761 * frames are queued in order, so if this one
762 * hasn't expired yet (or we reached the end of
763 * the queue) we can stop testing
768 local->total_ps_buffered--;
769 ps_dbg(sta->sdata, "Buffered frame expired (STA %pM)\n",
771 ieee80211_free_txskb(&local->hw, skb);
775 * Finally, recalculate the TIM bit for this station -- it might
776 * now be clear because the station was too slow to retrieve its
779 sta_info_recalc_tim(sta);
782 * Return whether there are any frames still buffered, this is
783 * used to check whether the cleanup timer still needs to run,
784 * if there are no frames we don't need to rearm the timer.
786 return !(skb_queue_empty(&sta->ps_tx_buf[ac]) &&
787 skb_queue_empty(&sta->tx_filtered[ac]));
790 static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
791 struct sta_info *sta)
793 bool have_buffered = false;
796 /* This is only necessary for stations on BSS/MBSS interfaces */
797 if (!sta->sdata->bss &&
798 !ieee80211_vif_is_mesh(&sta->sdata->vif))
801 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
803 sta_info_cleanup_expire_buffered_ac(local, sta, ac);
805 return have_buffered;
808 static int __must_check __sta_info_destroy_part1(struct sta_info *sta)
810 struct ieee80211_local *local;
811 struct ieee80211_sub_if_data *sdata;
822 lockdep_assert_held(&local->sta_mtx);
825 * Before removing the station from the driver and
826 * rate control, it might still start new aggregation
827 * sessions -- block that to make sure the tear-down
828 * will be sufficient.
830 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
831 ieee80211_sta_tear_down_BA_sessions(sta, AGG_STOP_DESTROY_STA);
833 ret = sta_info_hash_del(local, sta);
837 list_del_rcu(&sta->list);
839 drv_sta_pre_rcu_remove(local, sta->sdata, sta);
841 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
842 rcu_access_pointer(sdata->u.vlan.sta) == sta)
843 RCU_INIT_POINTER(sdata->u.vlan.sta, NULL);
848 static void __sta_info_destroy_part2(struct sta_info *sta)
850 struct ieee80211_local *local = sta->local;
851 struct ieee80211_sub_if_data *sdata = sta->sdata;
855 * NOTE: This assumes at least synchronize_net() was done
856 * after _part1 and before _part2!
860 lockdep_assert_held(&local->sta_mtx);
862 /* now keys can no longer be reached */
863 ieee80211_free_sta_keys(local, sta);
868 local->sta_generation++;
870 while (sta->sta_state > IEEE80211_STA_NONE) {
871 ret = sta_info_move_state(sta, sta->sta_state - 1);
879 ret = drv_sta_state(local, sdata, sta, IEEE80211_STA_NONE,
880 IEEE80211_STA_NOTEXIST);
881 WARN_ON_ONCE(ret != 0);
884 sta_dbg(sdata, "Removed STA %pM\n", sta->sta.addr);
886 cfg80211_del_sta(sdata->dev, sta->sta.addr, GFP_KERNEL);
888 rate_control_remove_sta_debugfs(sta);
889 ieee80211_sta_debugfs_remove(sta);
890 ieee80211_recalc_min_chandef(sdata);
892 cleanup_single_sta(sta);
895 int __must_check __sta_info_destroy(struct sta_info *sta)
897 int err = __sta_info_destroy_part1(sta);
904 __sta_info_destroy_part2(sta);
909 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr)
911 struct sta_info *sta;
914 mutex_lock(&sdata->local->sta_mtx);
915 sta = sta_info_get(sdata, addr);
916 ret = __sta_info_destroy(sta);
917 mutex_unlock(&sdata->local->sta_mtx);
922 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
925 struct sta_info *sta;
928 mutex_lock(&sdata->local->sta_mtx);
929 sta = sta_info_get_bss(sdata, addr);
930 ret = __sta_info_destroy(sta);
931 mutex_unlock(&sdata->local->sta_mtx);
936 static void sta_info_cleanup(unsigned long data)
938 struct ieee80211_local *local = (struct ieee80211_local *) data;
939 struct sta_info *sta;
940 bool timer_needed = false;
943 list_for_each_entry_rcu(sta, &local->sta_list, list)
944 if (sta_info_cleanup_expire_buffered(local, sta))
948 if (local->quiescing)
954 mod_timer(&local->sta_cleanup,
955 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL));
958 void sta_info_init(struct ieee80211_local *local)
960 spin_lock_init(&local->tim_lock);
961 mutex_init(&local->sta_mtx);
962 INIT_LIST_HEAD(&local->sta_list);
964 setup_timer(&local->sta_cleanup, sta_info_cleanup,
965 (unsigned long)local);
968 void sta_info_stop(struct ieee80211_local *local)
970 del_timer_sync(&local->sta_cleanup);
974 int __sta_info_flush(struct ieee80211_sub_if_data *sdata, bool vlans)
976 struct ieee80211_local *local = sdata->local;
977 struct sta_info *sta, *tmp;
978 LIST_HEAD(free_list);
983 WARN_ON(vlans && sdata->vif.type != NL80211_IFTYPE_AP);
984 WARN_ON(vlans && !sdata->bss);
986 mutex_lock(&local->sta_mtx);
987 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
988 if (sdata == sta->sdata ||
989 (vlans && sdata->bss == sta->sdata->bss)) {
990 if (!WARN_ON(__sta_info_destroy_part1(sta)))
991 list_add(&sta->free_list, &free_list);
996 if (!list_empty(&free_list)) {
998 list_for_each_entry_safe(sta, tmp, &free_list, free_list)
999 __sta_info_destroy_part2(sta);
1001 mutex_unlock(&local->sta_mtx);
1006 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
1007 unsigned long exp_time)
1009 struct ieee80211_local *local = sdata->local;
1010 struct sta_info *sta, *tmp;
1012 mutex_lock(&local->sta_mtx);
1014 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1015 if (sdata != sta->sdata)
1018 if (time_after(jiffies, sta->last_rx + exp_time)) {
1019 sta_dbg(sta->sdata, "expiring inactive STA %pM\n",
1022 if (ieee80211_vif_is_mesh(&sdata->vif) &&
1023 test_sta_flag(sta, WLAN_STA_PS_STA))
1024 atomic_dec(&sdata->u.mesh.ps.num_sta_ps);
1026 WARN_ON(__sta_info_destroy(sta));
1030 mutex_unlock(&local->sta_mtx);
1033 struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw,
1035 const u8 *localaddr)
1037 struct sta_info *sta, *nxt;
1040 * Just return a random station if localaddr is NULL
1041 * ... first in list.
1043 for_each_sta_info(hw_to_local(hw), addr, sta, nxt) {
1045 !ether_addr_equal(sta->sdata->vif.addr, localaddr))
1054 EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr);
1056 struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif,
1059 struct sta_info *sta;
1064 sta = sta_info_get_bss(vif_to_sdata(vif), addr);
1073 EXPORT_SYMBOL(ieee80211_find_sta);
1075 static void clear_sta_ps_flags(void *_sta)
1077 struct sta_info *sta = _sta;
1078 struct ieee80211_sub_if_data *sdata = sta->sdata;
1081 if (sdata->vif.type == NL80211_IFTYPE_AP ||
1082 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1083 ps = &sdata->bss->ps;
1084 else if (ieee80211_vif_is_mesh(&sdata->vif))
1085 ps = &sdata->u.mesh.ps;
1089 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
1090 if (test_and_clear_sta_flag(sta, WLAN_STA_PS_STA))
1091 atomic_dec(&ps->num_sta_ps);
1094 /* powersave support code */
1095 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
1097 struct ieee80211_sub_if_data *sdata = sta->sdata;
1098 struct ieee80211_local *local = sdata->local;
1099 struct sk_buff_head pending;
1100 int filtered = 0, buffered = 0, ac;
1101 unsigned long flags;
1103 clear_sta_flag(sta, WLAN_STA_SP);
1105 BUILD_BUG_ON(BITS_TO_LONGS(IEEE80211_NUM_TIDS) > 1);
1106 sta->driver_buffered_tids = 0;
1108 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1109 drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta);
1111 skb_queue_head_init(&pending);
1113 /* sync with ieee80211_tx_h_unicast_ps_buf */
1114 spin_lock(&sta->ps_lock);
1115 /* Send all buffered frames to the station */
1116 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1117 int count = skb_queue_len(&pending), tmp;
1119 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
1120 skb_queue_splice_tail_init(&sta->tx_filtered[ac], &pending);
1121 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
1122 tmp = skb_queue_len(&pending);
1123 filtered += tmp - count;
1126 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
1127 skb_queue_splice_tail_init(&sta->ps_tx_buf[ac], &pending);
1128 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
1129 tmp = skb_queue_len(&pending);
1130 buffered += tmp - count;
1133 ieee80211_add_pending_skbs_fn(local, &pending, clear_sta_ps_flags, sta);
1134 spin_unlock(&sta->ps_lock);
1136 /* This station just woke up and isn't aware of our SMPS state */
1137 if (!ieee80211_smps_is_restrictive(sta->known_smps_mode,
1138 sdata->smps_mode) &&
1139 sta->known_smps_mode != sdata->bss->req_smps &&
1140 sta_info_tx_streams(sta) != 1) {
1142 "%pM just woke up and MIMO capable - update SMPS\n",
1144 ieee80211_send_smps_action(sdata, sdata->bss->req_smps,
1146 sdata->vif.bss_conf.bssid);
1149 local->total_ps_buffered -= buffered;
1151 sta_info_recalc_tim(sta);
1154 "STA %pM aid %d sending %d filtered/%d PS frames since STA not sleeping anymore\n",
1155 sta->sta.addr, sta->sta.aid, filtered, buffered);
1158 static void ieee80211_send_null_response(struct ieee80211_sub_if_data *sdata,
1159 struct sta_info *sta, int tid,
1160 enum ieee80211_frame_release_type reason,
1163 struct ieee80211_local *local = sdata->local;
1164 struct ieee80211_qos_hdr *nullfunc;
1165 struct sk_buff *skb;
1166 int size = sizeof(*nullfunc);
1168 bool qos = test_sta_flag(sta, WLAN_STA_WME);
1169 struct ieee80211_tx_info *info;
1170 struct ieee80211_chanctx_conf *chanctx_conf;
1173 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1174 IEEE80211_STYPE_QOS_NULLFUNC |
1175 IEEE80211_FCTL_FROMDS);
1178 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1179 IEEE80211_STYPE_NULLFUNC |
1180 IEEE80211_FCTL_FROMDS);
1183 skb = dev_alloc_skb(local->hw.extra_tx_headroom + size);
1187 skb_reserve(skb, local->hw.extra_tx_headroom);
1189 nullfunc = (void *) skb_put(skb, size);
1190 nullfunc->frame_control = fc;
1191 nullfunc->duration_id = 0;
1192 memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN);
1193 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
1194 memcpy(nullfunc->addr3, sdata->vif.addr, ETH_ALEN);
1196 skb->priority = tid;
1197 skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]);
1199 nullfunc->qos_ctrl = cpu_to_le16(tid);
1201 if (reason == IEEE80211_FRAME_RELEASE_UAPSD)
1202 nullfunc->qos_ctrl |=
1203 cpu_to_le16(IEEE80211_QOS_CTL_EOSP);
1206 info = IEEE80211_SKB_CB(skb);
1209 * Tell TX path to send this frame even though the
1210 * STA may still remain is PS mode after this frame
1211 * exchange. Also set EOSP to indicate this packet
1212 * ends the poll/service period.
1214 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
1215 IEEE80211_TX_CTL_PS_RESPONSE |
1216 IEEE80211_TX_STATUS_EOSP |
1217 IEEE80211_TX_CTL_REQ_TX_STATUS;
1220 drv_allow_buffered_frames(local, sta, BIT(tid), 1,
1223 skb->dev = sdata->dev;
1226 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1227 if (WARN_ON(!chanctx_conf)) {
1233 ieee80211_xmit(sdata, skb, chanctx_conf->def.chan->band);
1237 static int find_highest_prio_tid(unsigned long tids)
1239 /* lower 3 TIDs aren't ordered perfectly */
1241 return fls(tids) - 1;
1242 /* TID 0 is BE just like TID 3 */
1245 return fls(tids) - 1;
1249 ieee80211_sta_ps_deliver_response(struct sta_info *sta,
1250 int n_frames, u8 ignored_acs,
1251 enum ieee80211_frame_release_type reason)
1253 struct ieee80211_sub_if_data *sdata = sta->sdata;
1254 struct ieee80211_local *local = sdata->local;
1255 bool more_data = false;
1257 unsigned long driver_release_tids = 0;
1258 struct sk_buff_head frames;
1260 /* Service or PS-Poll period starts */
1261 set_sta_flag(sta, WLAN_STA_SP);
1263 __skb_queue_head_init(&frames);
1265 /* Get response frame(s) and more data bit for the last one. */
1266 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1269 if (ignored_acs & BIT(ac))
1272 tids = ieee80211_tids_for_ac(ac);
1274 /* if we already have frames from software, then we can't also
1275 * release from hardware queues
1277 if (skb_queue_empty(&frames))
1278 driver_release_tids |= sta->driver_buffered_tids & tids;
1280 if (driver_release_tids) {
1281 /* If the driver has data on more than one TID then
1282 * certainly there's more data if we release just a
1283 * single frame now (from a single TID). This will
1284 * only happen for PS-Poll.
1286 if (reason == IEEE80211_FRAME_RELEASE_PSPOLL &&
1287 hweight16(driver_release_tids) > 1) {
1289 driver_release_tids =
1290 BIT(find_highest_prio_tid(
1291 driver_release_tids));
1295 struct sk_buff *skb;
1297 while (n_frames > 0) {
1298 skb = skb_dequeue(&sta->tx_filtered[ac]);
1301 &sta->ps_tx_buf[ac]);
1303 local->total_ps_buffered--;
1308 __skb_queue_tail(&frames, skb);
1312 /* If we have more frames buffered on this AC, then set the
1313 * more-data bit and abort the loop since we can't send more
1314 * data from other ACs before the buffered frames from this.
1316 if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
1317 !skb_queue_empty(&sta->ps_tx_buf[ac])) {
1323 if (skb_queue_empty(&frames) && !driver_release_tids) {
1327 * For PS-Poll, this can only happen due to a race condition
1328 * when we set the TIM bit and the station notices it, but
1329 * before it can poll for the frame we expire it.
1331 * For uAPSD, this is said in the standard (11.2.1.5 h):
1332 * At each unscheduled SP for a non-AP STA, the AP shall
1333 * attempt to transmit at least one MSDU or MMPDU, but no
1334 * more than the value specified in the Max SP Length field
1335 * in the QoS Capability element from delivery-enabled ACs,
1336 * that are destined for the non-AP STA.
1338 * Since we have no other MSDU/MMPDU, transmit a QoS null frame.
1341 /* This will evaluate to 1, 3, 5 or 7. */
1342 tid = 7 - ((ffs(~ignored_acs) - 1) << 1);
1344 ieee80211_send_null_response(sdata, sta, tid, reason, true);
1345 } else if (!driver_release_tids) {
1346 struct sk_buff_head pending;
1347 struct sk_buff *skb;
1350 bool need_null = false;
1352 skb_queue_head_init(&pending);
1354 while ((skb = __skb_dequeue(&frames))) {
1355 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1356 struct ieee80211_hdr *hdr = (void *) skb->data;
1362 * Tell TX path to send this frame even though the
1363 * STA may still remain is PS mode after this frame
1366 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
1367 IEEE80211_TX_CTL_PS_RESPONSE;
1370 * Use MoreData flag to indicate whether there are
1371 * more buffered frames for this STA
1373 if (more_data || !skb_queue_empty(&frames))
1374 hdr->frame_control |=
1375 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1377 hdr->frame_control &=
1378 cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1380 if (ieee80211_is_data_qos(hdr->frame_control) ||
1381 ieee80211_is_qos_nullfunc(hdr->frame_control))
1382 qoshdr = ieee80211_get_qos_ctl(hdr);
1384 tids |= BIT(skb->priority);
1386 __skb_queue_tail(&pending, skb);
1388 /* end service period after last frame or add one */
1389 if (!skb_queue_empty(&frames))
1392 if (reason != IEEE80211_FRAME_RELEASE_UAPSD) {
1393 /* for PS-Poll, there's only one frame */
1394 info->flags |= IEEE80211_TX_STATUS_EOSP |
1395 IEEE80211_TX_CTL_REQ_TX_STATUS;
1399 /* For uAPSD, things are a bit more complicated. If the
1400 * last frame has a QoS header (i.e. is a QoS-data or
1401 * QoS-nulldata frame) then just set the EOSP bit there
1403 * If the frame doesn't have a QoS header (which means
1404 * it should be a bufferable MMPDU) then we can't set
1405 * the EOSP bit in the QoS header; add a QoS-nulldata
1406 * frame to the list to send it after the MMPDU.
1408 * Note that this code is only in the mac80211-release
1409 * code path, we assume that the driver will not buffer
1410 * anything but QoS-data frames, or if it does, will
1411 * create the QoS-nulldata frame by itself if needed.
1413 * Cf. 802.11-2012 10.2.1.10 (c).
1416 *qoshdr |= IEEE80211_QOS_CTL_EOSP;
1418 info->flags |= IEEE80211_TX_STATUS_EOSP |
1419 IEEE80211_TX_CTL_REQ_TX_STATUS;
1421 /* The standard isn't completely clear on this
1422 * as it says the more-data bit should be set
1423 * if there are more BUs. The QoS-Null frame
1424 * we're about to send isn't buffered yet, we
1425 * only create it below, but let's pretend it
1426 * was buffered just in case some clients only
1427 * expect more-data=0 when eosp=1.
1429 hdr->frame_control |=
1430 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1437 drv_allow_buffered_frames(local, sta, tids, num,
1440 ieee80211_add_pending_skbs(local, &pending);
1443 ieee80211_send_null_response(
1444 sdata, sta, find_highest_prio_tid(tids),
1447 sta_info_recalc_tim(sta);
1450 * We need to release a frame that is buffered somewhere in the
1451 * driver ... it'll have to handle that.
1452 * Note that the driver also has to check the number of frames
1453 * on the TIDs we're releasing from - if there are more than
1454 * n_frames it has to set the more-data bit (if we didn't ask
1455 * it to set it anyway due to other buffered frames); if there
1456 * are fewer than n_frames it has to make sure to adjust that
1457 * to allow the service period to end properly.
1459 drv_release_buffered_frames(local, sta, driver_release_tids,
1460 n_frames, reason, more_data);
1463 * Note that we don't recalculate the TIM bit here as it would
1464 * most likely have no effect at all unless the driver told us
1465 * that the TID(s) became empty before returning here from the
1467 * Either way, however, when the driver tells us that the TID(s)
1468 * became empty we'll do the TIM recalculation.
1473 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
1475 u8 ignore_for_response = sta->sta.uapsd_queues;
1478 * If all ACs are delivery-enabled then we should reply
1479 * from any of them, if only some are enabled we reply
1480 * only from the non-enabled ones.
1482 if (ignore_for_response == BIT(IEEE80211_NUM_ACS) - 1)
1483 ignore_for_response = 0;
1485 ieee80211_sta_ps_deliver_response(sta, 1, ignore_for_response,
1486 IEEE80211_FRAME_RELEASE_PSPOLL);
1489 void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta)
1491 int n_frames = sta->sta.max_sp;
1492 u8 delivery_enabled = sta->sta.uapsd_queues;
1495 * If we ever grow support for TSPEC this might happen if
1496 * the TSPEC update from hostapd comes in between a trigger
1497 * frame setting WLAN_STA_UAPSD in the RX path and this
1498 * actually getting called.
1500 if (!delivery_enabled)
1503 switch (sta->sta.max_sp) {
1514 /* XXX: what is a good value? */
1519 ieee80211_sta_ps_deliver_response(sta, n_frames, ~delivery_enabled,
1520 IEEE80211_FRAME_RELEASE_UAPSD);
1523 void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
1524 struct ieee80211_sta *pubsta, bool block)
1526 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1528 trace_api_sta_block_awake(sta->local, pubsta, block);
1531 set_sta_flag(sta, WLAN_STA_PS_DRIVER);
1532 else if (test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1533 ieee80211_queue_work(hw, &sta->drv_unblock_wk);
1535 EXPORT_SYMBOL(ieee80211_sta_block_awake);
1537 void ieee80211_sta_eosp(struct ieee80211_sta *pubsta)
1539 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1540 struct ieee80211_local *local = sta->local;
1542 trace_api_eosp(local, pubsta);
1544 clear_sta_flag(sta, WLAN_STA_SP);
1546 EXPORT_SYMBOL(ieee80211_sta_eosp);
1548 void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta,
1549 u8 tid, bool buffered)
1551 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1553 if (WARN_ON(tid >= IEEE80211_NUM_TIDS))
1556 trace_api_sta_set_buffered(sta->local, pubsta, tid, buffered);
1559 set_bit(tid, &sta->driver_buffered_tids);
1561 clear_bit(tid, &sta->driver_buffered_tids);
1563 sta_info_recalc_tim(sta);
1565 EXPORT_SYMBOL(ieee80211_sta_set_buffered);
1567 int sta_info_move_state(struct sta_info *sta,
1568 enum ieee80211_sta_state new_state)
1572 if (sta->sta_state == new_state)
1575 /* check allowed transitions first */
1577 switch (new_state) {
1578 case IEEE80211_STA_NONE:
1579 if (sta->sta_state != IEEE80211_STA_AUTH)
1582 case IEEE80211_STA_AUTH:
1583 if (sta->sta_state != IEEE80211_STA_NONE &&
1584 sta->sta_state != IEEE80211_STA_ASSOC)
1587 case IEEE80211_STA_ASSOC:
1588 if (sta->sta_state != IEEE80211_STA_AUTH &&
1589 sta->sta_state != IEEE80211_STA_AUTHORIZED)
1592 case IEEE80211_STA_AUTHORIZED:
1593 if (sta->sta_state != IEEE80211_STA_ASSOC)
1597 WARN(1, "invalid state %d", new_state);
1601 sta_dbg(sta->sdata, "moving STA %pM to state %d\n",
1602 sta->sta.addr, new_state);
1605 * notify the driver before the actual changes so it can
1606 * fail the transition
1608 if (test_sta_flag(sta, WLAN_STA_INSERTED)) {
1609 int err = drv_sta_state(sta->local, sta->sdata, sta,
1610 sta->sta_state, new_state);
1615 /* reflect the change in all state variables */
1617 switch (new_state) {
1618 case IEEE80211_STA_NONE:
1619 if (sta->sta_state == IEEE80211_STA_AUTH)
1620 clear_bit(WLAN_STA_AUTH, &sta->_flags);
1622 case IEEE80211_STA_AUTH:
1623 if (sta->sta_state == IEEE80211_STA_NONE)
1624 set_bit(WLAN_STA_AUTH, &sta->_flags);
1625 else if (sta->sta_state == IEEE80211_STA_ASSOC)
1626 clear_bit(WLAN_STA_ASSOC, &sta->_flags);
1628 case IEEE80211_STA_ASSOC:
1629 if (sta->sta_state == IEEE80211_STA_AUTH) {
1630 set_bit(WLAN_STA_ASSOC, &sta->_flags);
1631 } else if (sta->sta_state == IEEE80211_STA_AUTHORIZED) {
1632 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1633 (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1634 !sta->sdata->u.vlan.sta))
1635 atomic_dec(&sta->sdata->bss->num_mcast_sta);
1636 clear_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1639 case IEEE80211_STA_AUTHORIZED:
1640 if (sta->sta_state == IEEE80211_STA_ASSOC) {
1641 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1642 (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1643 !sta->sdata->u.vlan.sta))
1644 atomic_inc(&sta->sdata->bss->num_mcast_sta);
1645 set_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1652 sta->sta_state = new_state;
1657 u8 sta_info_tx_streams(struct sta_info *sta)
1659 struct ieee80211_sta_ht_cap *ht_cap = &sta->sta.ht_cap;
1662 if (!sta->sta.ht_cap.ht_supported)
1665 if (sta->sta.vht_cap.vht_supported) {
1668 le16_to_cpu(sta->sta.vht_cap.vht_mcs.tx_mcs_map);
1670 for (i = 7; i >= 0; i--)
1671 if ((tx_mcs_map & (0x3 << (i * 2))) !=
1672 IEEE80211_VHT_MCS_NOT_SUPPORTED)
1676 if (ht_cap->mcs.rx_mask[3])
1678 else if (ht_cap->mcs.rx_mask[2])
1680 else if (ht_cap->mcs.rx_mask[1])
1685 if (!(ht_cap->mcs.tx_params & IEEE80211_HT_MCS_TX_RX_DIFF))
1688 return ((ht_cap->mcs.tx_params & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
1689 >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;