ARM: tegra: dvfs: Add interface to set fmax at vmin
[linux-3.10.git] / net / mac80211 / status.c
1 /*
2  * Copyright 2002-2005, Instant802 Networks, Inc.
3  * Copyright 2005-2006, Devicescape Software, Inc.
4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
5  * Copyright 2008-2010  Johannes Berg <johannes@sipsolutions.net>
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License version 2 as
9  * published by the Free Software Foundation.
10  */
11
12 #include <linux/export.h>
13 #include <linux/etherdevice.h>
14 #include <net/mac80211.h>
15 #include <asm/unaligned.h>
16 #include "ieee80211_i.h"
17 #include "rate.h"
18 #include "mesh.h"
19 #include "led.h"
20 #include "wme.h"
21
22
23 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
24                                  struct sk_buff *skb)
25 {
26         struct ieee80211_local *local = hw_to_local(hw);
27         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
28         int tmp;
29
30         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
31         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
32                        &local->skb_queue : &local->skb_queue_unreliable, skb);
33         tmp = skb_queue_len(&local->skb_queue) +
34                 skb_queue_len(&local->skb_queue_unreliable);
35         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
36                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
37                 ieee80211_free_txskb(hw, skb);
38                 tmp--;
39                 I802_DEBUG_INC(local->tx_status_drop);
40         }
41         tasklet_schedule(&local->tasklet);
42 }
43 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
44
45 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
46                                             struct sta_info *sta,
47                                             struct sk_buff *skb)
48 {
49         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
50         struct ieee80211_hdr *hdr = (void *)skb->data;
51         int ac;
52
53         /*
54          * This skb 'survived' a round-trip through the driver, and
55          * hopefully the driver didn't mangle it too badly. However,
56          * we can definitely not rely on the control information
57          * being correct. Clear it so we don't get junk there, and
58          * indicate that it needs new processing, but must not be
59          * modified/encrypted again.
60          */
61         memset(&info->control, 0, sizeof(info->control));
62
63         info->control.jiffies = jiffies;
64         info->control.vif = &sta->sdata->vif;
65         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING |
66                        IEEE80211_TX_INTFL_RETRANSMISSION;
67         info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
68
69         sta->tx_filtered_count++;
70
71         /*
72          * Clear more-data bit on filtered frames, it might be set
73          * but later frames might time out so it might have to be
74          * clear again ... It's all rather unlikely (this frame
75          * should time out first, right?) but let's not confuse
76          * peers unnecessarily.
77          */
78         if (hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_MOREDATA))
79                 hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_MOREDATA);
80
81         if (ieee80211_is_data_qos(hdr->frame_control)) {
82                 u8 *p = ieee80211_get_qos_ctl(hdr);
83                 int tid = *p & IEEE80211_QOS_CTL_TID_MASK;
84
85                 /*
86                  * Clear EOSP if set, this could happen e.g.
87                  * if an absence period (us being a P2P GO)
88                  * shortens the SP.
89                  */
90                 if (*p & IEEE80211_QOS_CTL_EOSP)
91                         *p &= ~IEEE80211_QOS_CTL_EOSP;
92                 ac = ieee802_1d_to_ac[tid & 7];
93         } else {
94                 ac = IEEE80211_AC_BE;
95         }
96
97         /*
98          * Clear the TX filter mask for this STA when sending the next
99          * packet. If the STA went to power save mode, this will happen
100          * when it wakes up for the next time.
101          */
102         set_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT);
103
104         /*
105          * This code races in the following way:
106          *
107          *  (1) STA sends frame indicating it will go to sleep and does so
108          *  (2) hardware/firmware adds STA to filter list, passes frame up
109          *  (3) hardware/firmware processes TX fifo and suppresses a frame
110          *  (4) we get TX status before having processed the frame and
111          *      knowing that the STA has gone to sleep.
112          *
113          * This is actually quite unlikely even when both those events are
114          * processed from interrupts coming in quickly after one another or
115          * even at the same time because we queue both TX status events and
116          * RX frames to be processed by a tasklet and process them in the
117          * same order that they were received or TX status last. Hence, there
118          * is no race as long as the frame RX is processed before the next TX
119          * status, which drivers can ensure, see below.
120          *
121          * Note that this can only happen if the hardware or firmware can
122          * actually add STAs to the filter list, if this is done by the
123          * driver in response to set_tim() (which will only reduce the race
124          * this whole filtering tries to solve, not completely solve it)
125          * this situation cannot happen.
126          *
127          * To completely solve this race drivers need to make sure that they
128          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
129          *      functions and
130          *  (b) always process RX events before TX status events if ordering
131          *      can be unknown, for example with different interrupt status
132          *      bits.
133          *  (c) if PS mode transitions are manual (i.e. the flag
134          *      %IEEE80211_HW_AP_LINK_PS is set), always process PS state
135          *      changes before calling TX status events if ordering can be
136          *      unknown.
137          */
138         if (test_sta_flag(sta, WLAN_STA_PS_STA) &&
139             skb_queue_len(&sta->tx_filtered[ac]) < STA_MAX_TX_BUFFER) {
140                 skb_queue_tail(&sta->tx_filtered[ac], skb);
141                 sta_info_recalc_tim(sta);
142
143                 if (!timer_pending(&local->sta_cleanup))
144                         mod_timer(&local->sta_cleanup,
145                                   round_jiffies(jiffies +
146                                                 STA_INFO_CLEANUP_INTERVAL));
147                 return;
148         }
149
150         if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
151             !(info->flags & IEEE80211_TX_INTFL_RETRIED)) {
152                 /* Software retry the packet once */
153                 info->flags |= IEEE80211_TX_INTFL_RETRIED;
154                 ieee80211_add_pending_skb(local, skb);
155                 return;
156         }
157
158         ps_dbg_ratelimited(sta->sdata,
159                            "dropped TX filtered frame, queue_len=%d PS=%d @%lu\n",
160                            skb_queue_len(&sta->tx_filtered[ac]),
161                            !!test_sta_flag(sta, WLAN_STA_PS_STA), jiffies);
162         ieee80211_free_txskb(&local->hw, skb);
163 }
164
165 static void ieee80211_check_pending_bar(struct sta_info *sta, u8 *addr, u8 tid)
166 {
167         struct tid_ampdu_tx *tid_tx;
168
169         tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
170         if (!tid_tx || !tid_tx->bar_pending)
171                 return;
172
173         tid_tx->bar_pending = false;
174         ieee80211_send_bar(&sta->sdata->vif, addr, tid, tid_tx->failed_bar_ssn);
175 }
176
177 static void ieee80211_frame_acked(struct sta_info *sta, struct sk_buff *skb)
178 {
179         struct ieee80211_mgmt *mgmt = (void *) skb->data;
180         struct ieee80211_local *local = sta->local;
181         struct ieee80211_sub_if_data *sdata = sta->sdata;
182
183         if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
184                 sta->last_rx = jiffies;
185
186         if (ieee80211_is_data_qos(mgmt->frame_control)) {
187                 struct ieee80211_hdr *hdr = (void *) skb->data;
188                 u8 *qc = ieee80211_get_qos_ctl(hdr);
189                 u16 tid = qc[0] & 0xf;
190
191                 ieee80211_check_pending_bar(sta, hdr->addr1, tid);
192         }
193
194         if (ieee80211_is_action(mgmt->frame_control) &&
195             mgmt->u.action.category == WLAN_CATEGORY_HT &&
196             mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS &&
197             sdata->vif.type == NL80211_IFTYPE_STATION &&
198             ieee80211_sdata_running(sdata)) {
199                 /*
200                  * This update looks racy, but isn't -- if we come
201                  * here we've definitely got a station that we're
202                  * talking to, and on a managed interface that can
203                  * only be the AP. And the only other place updating
204                  * this variable in managed mode is before association.
205                  */
206                 switch (mgmt->u.action.u.ht_smps.smps_control) {
207                 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
208                         sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
209                         break;
210                 case WLAN_HT_SMPS_CONTROL_STATIC:
211                         sdata->smps_mode = IEEE80211_SMPS_STATIC;
212                         break;
213                 case WLAN_HT_SMPS_CONTROL_DISABLED:
214                 default: /* shouldn't happen since we don't send that */
215                         sdata->smps_mode = IEEE80211_SMPS_OFF;
216                         break;
217                 }
218
219                 ieee80211_queue_work(&local->hw, &sdata->recalc_smps);
220         }
221 }
222
223 static void ieee80211_set_bar_pending(struct sta_info *sta, u8 tid, u16 ssn)
224 {
225         struct tid_ampdu_tx *tid_tx;
226
227         tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
228         if (!tid_tx)
229                 return;
230
231         tid_tx->failed_bar_ssn = ssn;
232         tid_tx->bar_pending = true;
233 }
234
235 static int ieee80211_tx_radiotap_len(struct ieee80211_tx_info *info)
236 {
237         int len = sizeof(struct ieee80211_radiotap_header);
238
239         /* IEEE80211_RADIOTAP_RATE rate */
240         if (info->status.rates[0].idx >= 0 &&
241             !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
242                 len += 2;
243
244         /* IEEE80211_RADIOTAP_TX_FLAGS */
245         len += 2;
246
247         /* IEEE80211_RADIOTAP_DATA_RETRIES */
248         len += 1;
249
250         /* IEEE80211_TX_RC_MCS */
251         if (info->status.rates[0].idx >= 0 &&
252             info->status.rates[0].flags & IEEE80211_TX_RC_MCS)
253                 len += 3;
254
255         return len;
256 }
257
258 static void ieee80211_add_tx_radiotap_header(struct ieee80211_supported_band
259                                              *sband, struct sk_buff *skb,
260                                              int retry_count, int rtap_len)
261 {
262         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
263         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
264         struct ieee80211_radiotap_header *rthdr;
265         unsigned char *pos;
266         u16 txflags;
267
268         rthdr = (struct ieee80211_radiotap_header *) skb_push(skb, rtap_len);
269
270         memset(rthdr, 0, rtap_len);
271         rthdr->it_len = cpu_to_le16(rtap_len);
272         rthdr->it_present =
273                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
274                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
275         pos = (unsigned char *)(rthdr + 1);
276
277         /*
278          * XXX: Once radiotap gets the bitmap reset thing the vendor
279          *      extensions proposal contains, we can actually report
280          *      the whole set of tries we did.
281          */
282
283         /* IEEE80211_RADIOTAP_RATE */
284         if (info->status.rates[0].idx >= 0 &&
285             !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS)) {
286                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
287                 *pos = sband->bitrates[info->status.rates[0].idx].bitrate / 5;
288                 /* padding for tx flags */
289                 pos += 2;
290         }
291
292         /* IEEE80211_RADIOTAP_TX_FLAGS */
293         txflags = 0;
294         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
295             !is_multicast_ether_addr(hdr->addr1))
296                 txflags |= IEEE80211_RADIOTAP_F_TX_FAIL;
297
298         if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
299             (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
300                 txflags |= IEEE80211_RADIOTAP_F_TX_CTS;
301         else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
302                 txflags |= IEEE80211_RADIOTAP_F_TX_RTS;
303
304         put_unaligned_le16(txflags, pos);
305         pos += 2;
306
307         /* IEEE80211_RADIOTAP_DATA_RETRIES */
308         /* for now report the total retry_count */
309         *pos = retry_count;
310         pos++;
311
312         /* IEEE80211_TX_RC_MCS */
313         if (info->status.rates[0].idx >= 0 &&
314             info->status.rates[0].flags & IEEE80211_TX_RC_MCS) {
315                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
316                 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
317                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
318                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
319                 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
320                         pos[1] |= IEEE80211_RADIOTAP_MCS_SGI;
321                 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
322                         pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40;
323                 if (info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)
324                         pos[1] |= IEEE80211_RADIOTAP_MCS_FMT_GF;
325                 pos[2] = info->status.rates[0].idx;
326                 pos += 3;
327         }
328
329 }
330
331 static void ieee80211_report_used_skb(struct ieee80211_local *local,
332                                       struct sk_buff *skb, bool dropped)
333 {
334         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
335         struct ieee80211_hdr *hdr = (void *)skb->data;
336         bool acked = info->flags & IEEE80211_TX_STAT_ACK;
337
338         if (dropped)
339                 acked = false;
340
341         if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX |
342                            IEEE80211_TX_INTFL_MLME_CONN_TX)) {
343                 struct ieee80211_sub_if_data *sdata = NULL;
344                 struct ieee80211_sub_if_data *iter_sdata;
345                 u64 cookie = (unsigned long)skb;
346
347                 rcu_read_lock();
348
349                 if (skb->dev) {
350                         list_for_each_entry_rcu(iter_sdata, &local->interfaces,
351                                                 list) {
352                                 if (!iter_sdata->dev)
353                                         continue;
354
355                                 if (skb->dev == iter_sdata->dev) {
356                                         sdata = iter_sdata;
357                                         break;
358                                 }
359                         }
360                 } else {
361                         sdata = rcu_dereference(local->p2p_sdata);
362                 }
363
364                 if (!sdata) {
365                         skb->dev = NULL;
366                 } else if (info->flags & IEEE80211_TX_INTFL_MLME_CONN_TX) {
367                         ieee80211_mgd_conn_tx_status(sdata, hdr->frame_control,
368                                                      acked);
369                 } else if (ieee80211_is_nullfunc(hdr->frame_control) ||
370                            ieee80211_is_qos_nullfunc(hdr->frame_control)) {
371                         cfg80211_probe_status(sdata->dev, hdr->addr1,
372                                               cookie, acked, GFP_ATOMIC);
373                 } else {
374                         cfg80211_mgmt_tx_status(&sdata->wdev, cookie, skb->data,
375                                                 skb->len, acked, GFP_ATOMIC);
376                 }
377
378                 rcu_read_unlock();
379         }
380
381         if (unlikely(info->ack_frame_id)) {
382                 struct sk_buff *ack_skb;
383                 unsigned long flags;
384
385                 spin_lock_irqsave(&local->ack_status_lock, flags);
386                 ack_skb = idr_find(&local->ack_status_frames,
387                                    info->ack_frame_id);
388                 if (ack_skb)
389                         idr_remove(&local->ack_status_frames,
390                                    info->ack_frame_id);
391                 spin_unlock_irqrestore(&local->ack_status_lock, flags);
392
393                 if (ack_skb) {
394                         if (!dropped) {
395                                 /* consumes ack_skb */
396                                 skb_complete_wifi_ack(ack_skb, acked);
397                         } else {
398                                 dev_kfree_skb_any(ack_skb);
399                         }
400                 }
401         }
402 }
403
404 /*
405  * Use a static threshold for now, best value to be determined
406  * by testing ...
407  * Should it depend on:
408  *  - on # of retransmissions
409  *  - current throughput (higher value for higher tpt)?
410  */
411 #define STA_LOST_PKT_THRESHOLD  50
412
413 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
414 {
415         struct sk_buff *skb2;
416         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
417         struct ieee80211_local *local = hw_to_local(hw);
418         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
419         __le16 fc;
420         struct ieee80211_supported_band *sband;
421         struct ieee80211_sub_if_data *sdata;
422         struct net_device *prev_dev = NULL;
423         struct sta_info *sta, *tmp;
424         int retry_count = -1, i;
425         int rates_idx = -1;
426         bool send_to_cooked;
427         bool acked;
428         struct ieee80211_bar *bar;
429         int rtap_len;
430
431         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
432                 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
433                     !(info->flags & IEEE80211_TX_STAT_AMPDU)) {
434                         /* just the first aggr frame carry status info */
435                         info->status.rates[i].idx = -1;
436                         info->status.rates[i].count = 0;
437                         break;
438                 } else if (info->status.rates[i].idx < 0) {
439                         break;
440                 } else if (i >= hw->max_report_rates) {
441                         /* the HW cannot have attempted that rate */
442                         info->status.rates[i].idx = -1;
443                         info->status.rates[i].count = 0;
444                         break;
445                 }
446
447                 retry_count += info->status.rates[i].count;
448         }
449         rates_idx = i - 1;
450
451         if (retry_count < 0)
452                 retry_count = 0;
453
454         rcu_read_lock();
455
456         sband = local->hw.wiphy->bands[info->band];
457         fc = hdr->frame_control;
458
459         for_each_sta_info(local, hdr->addr1, sta, tmp) {
460                 /* skip wrong virtual interface */
461                 if (!ether_addr_equal(hdr->addr2, sta->sdata->vif.addr))
462                         continue;
463
464                 if (info->flags & IEEE80211_TX_STATUS_EOSP)
465                         clear_sta_flag(sta, WLAN_STA_SP);
466
467                 acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
468                 if (!acked && test_sta_flag(sta, WLAN_STA_PS_STA)) {
469                         /*
470                          * The STA is in power save mode, so assume
471                          * that this TX packet failed because of that.
472                          */
473                         ieee80211_handle_filtered_frame(local, sta, skb);
474                         rcu_read_unlock();
475                         return;
476                 }
477
478                 /* mesh Peer Service Period support */
479                 if (ieee80211_vif_is_mesh(&sta->sdata->vif) &&
480                     ieee80211_is_data_qos(fc))
481                         ieee80211_mpsp_trigger_process(
482                                         ieee80211_get_qos_ctl(hdr),
483                                         sta, true, acked);
484
485                 if ((local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) &&
486                     (rates_idx != -1))
487                         sta->last_tx_rate = info->status.rates[rates_idx];
488
489                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
490                     (ieee80211_is_data_qos(fc))) {
491                         u16 tid, ssn;
492                         u8 *qc;
493
494                         qc = ieee80211_get_qos_ctl(hdr);
495                         tid = qc[0] & 0xf;
496                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
497                                                 & IEEE80211_SCTL_SEQ);
498                         ieee80211_send_bar(&sta->sdata->vif, hdr->addr1,
499                                            tid, ssn);
500                 }
501
502                 if (!acked && ieee80211_is_back_req(fc)) {
503                         u16 tid, control;
504
505                         /*
506                          * BAR failed, store the last SSN and retry sending
507                          * the BAR when the next unicast transmission on the
508                          * same TID succeeds.
509                          */
510                         bar = (struct ieee80211_bar *) skb->data;
511                         control = le16_to_cpu(bar->control);
512                         if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) {
513                                 u16 ssn = le16_to_cpu(bar->start_seq_num);
514
515                                 tid = (control &
516                                        IEEE80211_BAR_CTRL_TID_INFO_MASK) >>
517                                       IEEE80211_BAR_CTRL_TID_INFO_SHIFT;
518
519                                 ieee80211_set_bar_pending(sta, tid, ssn);
520                         }
521                 }
522
523                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
524                         ieee80211_handle_filtered_frame(local, sta, skb);
525                         rcu_read_unlock();
526                         return;
527                 } else {
528                         if (!acked)
529                                 sta->tx_retry_failed++;
530                         sta->tx_retry_count += retry_count;
531                 }
532
533                 rate_control_tx_status(local, sband, sta, skb);
534                 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
535                         ieee80211s_update_metric(local, sta, skb);
536
537                 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked)
538                         ieee80211_frame_acked(sta, skb);
539
540                 if ((sta->sdata->vif.type == NL80211_IFTYPE_STATION) &&
541                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
542                         ieee80211_sta_tx_notify(sta->sdata, (void *) skb->data, acked);
543
544                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
545                         if (info->flags & IEEE80211_TX_STAT_ACK) {
546                                 if (sta->lost_packets)
547                                         sta->lost_packets = 0;
548                         } else if (++sta->lost_packets >= STA_LOST_PKT_THRESHOLD) {
549                                 cfg80211_cqm_pktloss_notify(sta->sdata->dev,
550                                                             sta->sta.addr,
551                                                             sta->lost_packets,
552                                                             GFP_ATOMIC);
553                                 sta->lost_packets = 0;
554                         }
555                 }
556
557                 if (acked)
558                         sta->last_ack_signal = info->status.ack_signal;
559         }
560
561         rcu_read_unlock();
562
563         ieee80211_led_tx(local, 0);
564
565         /* SNMP counters
566          * Fragments are passed to low-level drivers as separate skbs, so these
567          * are actually fragments, not frames. Update frame counters only for
568          * the first fragment of the frame. */
569         if (info->flags & IEEE80211_TX_STAT_ACK) {
570                 if (ieee80211_is_first_frag(hdr->seq_ctrl)) {
571                         local->dot11TransmittedFrameCount++;
572                         if (is_multicast_ether_addr(hdr->addr1))
573                                 local->dot11MulticastTransmittedFrameCount++;
574                         if (retry_count > 0)
575                                 local->dot11RetryCount++;
576                         if (retry_count > 1)
577                                 local->dot11MultipleRetryCount++;
578                 }
579
580                 /* This counter shall be incremented for an acknowledged MPDU
581                  * with an individual address in the address 1 field or an MPDU
582                  * with a multicast address in the address 1 field of type Data
583                  * or Management. */
584                 if (!is_multicast_ether_addr(hdr->addr1) ||
585                     ieee80211_is_data(fc) ||
586                     ieee80211_is_mgmt(fc))
587                         local->dot11TransmittedFragmentCount++;
588         } else {
589                 if (ieee80211_is_first_frag(hdr->seq_ctrl))
590                         local->dot11FailedCount++;
591         }
592
593         if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) &&
594             (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
595             !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
596             local->ps_sdata && !(local->scanning)) {
597                 if (info->flags & IEEE80211_TX_STAT_ACK) {
598                         local->ps_sdata->u.mgd.flags |=
599                                         IEEE80211_STA_NULLFUNC_ACKED;
600                 } else
601                         mod_timer(&local->dynamic_ps_timer, jiffies +
602                                         msecs_to_jiffies(10));
603         }
604
605         ieee80211_report_used_skb(local, skb, false);
606
607         /* this was a transmitted frame, but now we want to reuse it */
608         skb_orphan(skb);
609
610         /* Need to make a copy before skb->cb gets cleared */
611         send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) ||
612                          !(ieee80211_is_data(fc));
613
614         /*
615          * This is a bit racy but we can avoid a lot of work
616          * with this test...
617          */
618         if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) {
619                 dev_kfree_skb(skb);
620                 return;
621         }
622
623         /* send frame to monitor interfaces now */
624         rtap_len = ieee80211_tx_radiotap_len(info);
625         if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) {
626                 pr_err("ieee80211_tx_status: headroom too small\n");
627                 dev_kfree_skb(skb);
628                 return;
629         }
630         ieee80211_add_tx_radiotap_header(sband, skb, retry_count, rtap_len);
631
632         /* XXX: is this sufficient for BPF? */
633         skb_set_mac_header(skb, 0);
634         skb->ip_summed = CHECKSUM_UNNECESSARY;
635         skb->pkt_type = PACKET_OTHERHOST;
636         skb->protocol = htons(ETH_P_802_2);
637         memset(skb->cb, 0, sizeof(skb->cb));
638
639         rcu_read_lock();
640         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
641                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
642                         if (!ieee80211_sdata_running(sdata))
643                                 continue;
644
645                         if ((sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) &&
646                             !send_to_cooked)
647                                 continue;
648
649                         if (prev_dev) {
650                                 skb2 = skb_clone(skb, GFP_ATOMIC);
651                                 if (skb2) {
652                                         skb2->dev = prev_dev;
653                                         netif_rx(skb2);
654                                 }
655                         }
656
657                         prev_dev = sdata->dev;
658                 }
659         }
660         if (prev_dev) {
661                 skb->dev = prev_dev;
662                 netif_rx(skb);
663                 skb = NULL;
664         }
665         rcu_read_unlock();
666         dev_kfree_skb(skb);
667 }
668 EXPORT_SYMBOL(ieee80211_tx_status);
669
670 void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets)
671 {
672         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
673         cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
674                                     num_packets, GFP_ATOMIC);
675 }
676 EXPORT_SYMBOL(ieee80211_report_low_ack);
677
678 void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb)
679 {
680         struct ieee80211_local *local = hw_to_local(hw);
681
682         ieee80211_report_used_skb(local, skb, true);
683         dev_kfree_skb_any(skb);
684 }
685 EXPORT_SYMBOL(ieee80211_free_txskb);
686
687 void ieee80211_purge_tx_queue(struct ieee80211_hw *hw,
688                               struct sk_buff_head *skbs)
689 {
690         struct sk_buff *skb;
691
692         while ((skb = __skb_dequeue(skbs)))
693                 ieee80211_free_txskb(hw, skb);
694 }