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hwmon: Add LTC2990 sensor driver
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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  * Copyright 2013-2014  Intel Mobile Communications GmbH
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License version 2 as
10  * published by the Free Software Foundation.
11  */
12
13 #include <linux/export.h>
14 #include <linux/etherdevice.h>
15 #include <net/mac80211.h>
16 #include <asm/unaligned.h>
17 #include "ieee80211_i.h"
18 #include "rate.h"
19 #include "mesh.h"
20 #include "led.h"
21 #include "wme.h"
22
23
24 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
25                                  struct sk_buff *skb)
26 {
27         struct ieee80211_local *local = hw_to_local(hw);
28         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
29         int tmp;
30
31         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
32         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
33                        &local->skb_queue : &local->skb_queue_unreliable, skb);
34         tmp = skb_queue_len(&local->skb_queue) +
35                 skb_queue_len(&local->skb_queue_unreliable);
36         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
37                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
38                 ieee80211_free_txskb(hw, skb);
39                 tmp--;
40                 I802_DEBUG_INC(local->tx_status_drop);
41         }
42         tasklet_schedule(&local->tasklet);
43 }
44 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
45
46 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
47                                             struct sta_info *sta,
48                                             struct sk_buff *skb)
49 {
50         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
51         struct ieee80211_hdr *hdr = (void *)skb->data;
52         int ac;
53
54         /*
55          * This skb 'survived' a round-trip through the driver, and
56          * hopefully the driver didn't mangle it too badly. However,
57          * we can definitely not rely on the control information
58          * being correct. Clear it so we don't get junk there, and
59          * indicate that it needs new processing, but must not be
60          * modified/encrypted again.
61          */
62         memset(&info->control, 0, sizeof(info->control));
63
64         info->control.jiffies = jiffies;
65         info->control.vif = &sta->sdata->vif;
66         info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING |
67                        IEEE80211_TX_INTFL_RETRANSMISSION;
68         info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
69
70         sta->status_stats.filtered++;
71
72         /*
73          * Clear more-data bit on filtered frames, it might be set
74          * but later frames might time out so it might have to be
75          * clear again ... It's all rather unlikely (this frame
76          * should time out first, right?) but let's not confuse
77          * peers unnecessarily.
78          */
79         if (hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_MOREDATA))
80                 hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_MOREDATA);
81
82         if (ieee80211_is_data_qos(hdr->frame_control)) {
83                 u8 *p = ieee80211_get_qos_ctl(hdr);
84                 int tid = *p & IEEE80211_QOS_CTL_TID_MASK;
85
86                 /*
87                  * Clear EOSP if set, this could happen e.g.
88                  * if an absence period (us being a P2P GO)
89                  * shortens the SP.
90                  */
91                 if (*p & IEEE80211_QOS_CTL_EOSP)
92                         *p &= ~IEEE80211_QOS_CTL_EOSP;
93                 ac = ieee802_1d_to_ac[tid & 7];
94         } else {
95                 ac = IEEE80211_AC_BE;
96         }
97
98         /*
99          * Clear the TX filter mask for this STA when sending the next
100          * packet. If the STA went to power save mode, this will happen
101          * when it wakes up for the next time.
102          */
103         set_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT);
104         ieee80211_clear_fast_xmit(sta);
105
106         /*
107          * This code races in the following way:
108          *
109          *  (1) STA sends frame indicating it will go to sleep and does so
110          *  (2) hardware/firmware adds STA to filter list, passes frame up
111          *  (3) hardware/firmware processes TX fifo and suppresses a frame
112          *  (4) we get TX status before having processed the frame and
113          *      knowing that the STA has gone to sleep.
114          *
115          * This is actually quite unlikely even when both those events are
116          * processed from interrupts coming in quickly after one another or
117          * even at the same time because we queue both TX status events and
118          * RX frames to be processed by a tasklet and process them in the
119          * same order that they were received or TX status last. Hence, there
120          * is no race as long as the frame RX is processed before the next TX
121          * status, which drivers can ensure, see below.
122          *
123          * Note that this can only happen if the hardware or firmware can
124          * actually add STAs to the filter list, if this is done by the
125          * driver in response to set_tim() (which will only reduce the race
126          * this whole filtering tries to solve, not completely solve it)
127          * this situation cannot happen.
128          *
129          * To completely solve this race drivers need to make sure that they
130          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
131          *      functions and
132          *  (b) always process RX events before TX status events if ordering
133          *      can be unknown, for example with different interrupt status
134          *      bits.
135          *  (c) if PS mode transitions are manual (i.e. the flag
136          *      %IEEE80211_HW_AP_LINK_PS is set), always process PS state
137          *      changes before calling TX status events if ordering can be
138          *      unknown.
139          */
140         if (test_sta_flag(sta, WLAN_STA_PS_STA) &&
141             skb_queue_len(&sta->tx_filtered[ac]) < STA_MAX_TX_BUFFER) {
142                 skb_queue_tail(&sta->tx_filtered[ac], skb);
143                 sta_info_recalc_tim(sta);
144
145                 if (!timer_pending(&local->sta_cleanup))
146                         mod_timer(&local->sta_cleanup,
147                                   round_jiffies(jiffies +
148                                                 STA_INFO_CLEANUP_INTERVAL));
149                 return;
150         }
151
152         if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
153             !(info->flags & IEEE80211_TX_INTFL_RETRIED)) {
154                 /* Software retry the packet once */
155                 info->flags |= IEEE80211_TX_INTFL_RETRIED;
156                 ieee80211_add_pending_skb(local, skb);
157                 return;
158         }
159
160         ps_dbg_ratelimited(sta->sdata,
161                            "dropped TX filtered frame, queue_len=%d PS=%d @%lu\n",
162                            skb_queue_len(&sta->tx_filtered[ac]),
163                            !!test_sta_flag(sta, WLAN_STA_PS_STA), jiffies);
164         ieee80211_free_txskb(&local->hw, skb);
165 }
166
167 static void ieee80211_check_pending_bar(struct sta_info *sta, u8 *addr, u8 tid)
168 {
169         struct tid_ampdu_tx *tid_tx;
170
171         tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
172         if (!tid_tx || !tid_tx->bar_pending)
173                 return;
174
175         tid_tx->bar_pending = false;
176         ieee80211_send_bar(&sta->sdata->vif, addr, tid, tid_tx->failed_bar_ssn);
177 }
178
179 static void ieee80211_frame_acked(struct sta_info *sta, struct sk_buff *skb)
180 {
181         struct ieee80211_mgmt *mgmt = (void *) skb->data;
182         struct ieee80211_local *local = sta->local;
183         struct ieee80211_sub_if_data *sdata = sta->sdata;
184
185         if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
186                 sta->rx_stats.last_rx = jiffies;
187
188         if (ieee80211_is_data_qos(mgmt->frame_control)) {
189                 struct ieee80211_hdr *hdr = (void *) skb->data;
190                 u8 *qc = ieee80211_get_qos_ctl(hdr);
191                 u16 tid = qc[0] & 0xf;
192
193                 ieee80211_check_pending_bar(sta, hdr->addr1, tid);
194         }
195
196         if (ieee80211_is_action(mgmt->frame_control) &&
197             mgmt->u.action.category == WLAN_CATEGORY_HT &&
198             mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS &&
199             ieee80211_sdata_running(sdata)) {
200                 enum ieee80211_smps_mode smps_mode;
201
202                 switch (mgmt->u.action.u.ht_smps.smps_control) {
203                 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
204                         smps_mode = IEEE80211_SMPS_DYNAMIC;
205                         break;
206                 case WLAN_HT_SMPS_CONTROL_STATIC:
207                         smps_mode = IEEE80211_SMPS_STATIC;
208                         break;
209                 case WLAN_HT_SMPS_CONTROL_DISABLED:
210                 default: /* shouldn't happen since we don't send that */
211                         smps_mode = IEEE80211_SMPS_OFF;
212                         break;
213                 }
214
215                 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
216                         /*
217                          * This update looks racy, but isn't -- if we come
218                          * here we've definitely got a station that we're
219                          * talking to, and on a managed interface that can
220                          * only be the AP. And the only other place updating
221                          * this variable in managed mode is before association.
222                          */
223                         sdata->smps_mode = smps_mode;
224                         ieee80211_queue_work(&local->hw, &sdata->recalc_smps);
225                 } else if (sdata->vif.type == NL80211_IFTYPE_AP ||
226                            sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
227                         sta->known_smps_mode = smps_mode;
228                 }
229         }
230 }
231
232 static void ieee80211_set_bar_pending(struct sta_info *sta, u8 tid, u16 ssn)
233 {
234         struct tid_ampdu_tx *tid_tx;
235
236         tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
237         if (!tid_tx)
238                 return;
239
240         tid_tx->failed_bar_ssn = ssn;
241         tid_tx->bar_pending = true;
242 }
243
244 static int ieee80211_tx_radiotap_len(struct ieee80211_tx_info *info)
245 {
246         int len = sizeof(struct ieee80211_radiotap_header);
247
248         /* IEEE80211_RADIOTAP_RATE rate */
249         if (info->status.rates[0].idx >= 0 &&
250             !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS |
251                                              IEEE80211_TX_RC_VHT_MCS)))
252                 len += 2;
253
254         /* IEEE80211_RADIOTAP_TX_FLAGS */
255         len += 2;
256
257         /* IEEE80211_RADIOTAP_DATA_RETRIES */
258         len += 1;
259
260         /* IEEE80211_RADIOTAP_MCS
261          * IEEE80211_RADIOTAP_VHT */
262         if (info->status.rates[0].idx >= 0) {
263                 if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS)
264                         len += 3;
265                 else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS)
266                         len = ALIGN(len, 2) + 12;
267         }
268
269         return len;
270 }
271
272 static void
273 ieee80211_add_tx_radiotap_header(struct ieee80211_local *local,
274                                  struct ieee80211_supported_band *sband,
275                                  struct sk_buff *skb, int retry_count,
276                                  int rtap_len, int shift)
277 {
278         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
279         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
280         struct ieee80211_radiotap_header *rthdr;
281         unsigned char *pos;
282         u16 txflags;
283
284         rthdr = (struct ieee80211_radiotap_header *) skb_push(skb, rtap_len);
285
286         memset(rthdr, 0, rtap_len);
287         rthdr->it_len = cpu_to_le16(rtap_len);
288         rthdr->it_present =
289                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
290                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
291         pos = (unsigned char *)(rthdr + 1);
292
293         /*
294          * XXX: Once radiotap gets the bitmap reset thing the vendor
295          *      extensions proposal contains, we can actually report
296          *      the whole set of tries we did.
297          */
298
299         /* IEEE80211_RADIOTAP_RATE */
300         if (info->status.rates[0].idx >= 0 &&
301             !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS |
302                                              IEEE80211_TX_RC_VHT_MCS))) {
303                 u16 rate;
304
305                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
306                 rate = sband->bitrates[info->status.rates[0].idx].bitrate;
307                 *pos = DIV_ROUND_UP(rate, 5 * (1 << shift));
308                 /* padding for tx flags */
309                 pos += 2;
310         }
311
312         /* IEEE80211_RADIOTAP_TX_FLAGS */
313         txflags = 0;
314         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
315             !is_multicast_ether_addr(hdr->addr1))
316                 txflags |= IEEE80211_RADIOTAP_F_TX_FAIL;
317
318         if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
319                 txflags |= IEEE80211_RADIOTAP_F_TX_CTS;
320         if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
321                 txflags |= IEEE80211_RADIOTAP_F_TX_RTS;
322
323         put_unaligned_le16(txflags, pos);
324         pos += 2;
325
326         /* IEEE80211_RADIOTAP_DATA_RETRIES */
327         /* for now report the total retry_count */
328         *pos = retry_count;
329         pos++;
330
331         if (info->status.rates[0].idx < 0)
332                 return;
333
334         /* IEEE80211_RADIOTAP_MCS
335          * IEEE80211_RADIOTAP_VHT */
336         if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS) {
337                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
338                 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
339                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
340                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
341                 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
342                         pos[1] |= IEEE80211_RADIOTAP_MCS_SGI;
343                 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
344                         pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40;
345                 if (info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)
346                         pos[1] |= IEEE80211_RADIOTAP_MCS_FMT_GF;
347                 pos[2] = info->status.rates[0].idx;
348                 pos += 3;
349         } else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS) {
350                 u16 known = local->hw.radiotap_vht_details &
351                         (IEEE80211_RADIOTAP_VHT_KNOWN_GI |
352                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH);
353
354                 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
355
356                 /* required alignment from rthdr */
357                 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
358
359                 /* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */
360                 put_unaligned_le16(known, pos);
361                 pos += 2;
362
363                 /* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */
364                 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
365                         *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
366                 pos++;
367
368                 /* u8 bandwidth */
369                 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
370                         *pos = 1;
371                 else if (info->status.rates[0].flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
372                         *pos = 4;
373                 else if (info->status.rates[0].flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
374                         *pos = 11;
375                 else /* IEEE80211_TX_RC_{20_MHZ_WIDTH,FIXME:DUP_DATA} */
376                         *pos = 0;
377                 pos++;
378
379                 /* u8 mcs_nss[4] */
380                 *pos = (ieee80211_rate_get_vht_mcs(&info->status.rates[0]) << 4) |
381                         ieee80211_rate_get_vht_nss(&info->status.rates[0]);
382                 pos += 4;
383
384                 /* u8 coding */
385                 pos++;
386                 /* u8 group_id */
387                 pos++;
388                 /* u16 partial_aid */
389                 pos += 2;
390         }
391 }
392
393 /*
394  * Handles the tx for TDLS teardown frames.
395  * If the frame wasn't ACKed by the peer - it will be re-sent through the AP
396  */
397 static void ieee80211_tdls_td_tx_handle(struct ieee80211_local *local,
398                                         struct ieee80211_sub_if_data *sdata,
399                                         struct sk_buff *skb, u32 flags)
400 {
401         struct sk_buff *teardown_skb;
402         struct sk_buff *orig_teardown_skb;
403         bool is_teardown = false;
404
405         /* Get the teardown data we need and free the lock */
406         spin_lock(&sdata->u.mgd.teardown_lock);
407         teardown_skb = sdata->u.mgd.teardown_skb;
408         orig_teardown_skb = sdata->u.mgd.orig_teardown_skb;
409         if ((skb == orig_teardown_skb) && teardown_skb) {
410                 sdata->u.mgd.teardown_skb = NULL;
411                 sdata->u.mgd.orig_teardown_skb = NULL;
412                 is_teardown = true;
413         }
414         spin_unlock(&sdata->u.mgd.teardown_lock);
415
416         if (is_teardown) {
417                 /* This mechanism relies on being able to get ACKs */
418                 WARN_ON(!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS));
419
420                 /* Check if peer has ACKed */
421                 if (flags & IEEE80211_TX_STAT_ACK) {
422                         dev_kfree_skb_any(teardown_skb);
423                 } else {
424                         tdls_dbg(sdata,
425                                  "TDLS Resending teardown through AP\n");
426
427                         ieee80211_subif_start_xmit(teardown_skb, skb->dev);
428                 }
429         }
430 }
431
432 static struct ieee80211_sub_if_data *
433 ieee80211_sdata_from_skb(struct ieee80211_local *local, struct sk_buff *skb)
434 {
435         struct ieee80211_sub_if_data *sdata;
436
437         if (skb->dev) {
438                 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
439                         if (!sdata->dev)
440                                 continue;
441
442                         if (skb->dev == sdata->dev)
443                                 return sdata;
444                 }
445
446                 return NULL;
447         }
448
449         return rcu_dereference(local->p2p_sdata);
450 }
451
452 static void ieee80211_report_ack_skb(struct ieee80211_local *local,
453                                      struct ieee80211_tx_info *info,
454                                      bool acked, bool dropped)
455 {
456         struct sk_buff *skb;
457         unsigned long flags;
458
459         spin_lock_irqsave(&local->ack_status_lock, flags);
460         skb = idr_find(&local->ack_status_frames, info->ack_frame_id);
461         if (skb)
462                 idr_remove(&local->ack_status_frames, info->ack_frame_id);
463         spin_unlock_irqrestore(&local->ack_status_lock, flags);
464
465         if (!skb)
466                 return;
467
468         if (dropped) {
469                 dev_kfree_skb_any(skb);
470                 return;
471         }
472
473         if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX) {
474                 u64 cookie = IEEE80211_SKB_CB(skb)->ack.cookie;
475                 struct ieee80211_sub_if_data *sdata;
476                 struct ieee80211_hdr *hdr = (void *)skb->data;
477
478                 rcu_read_lock();
479                 sdata = ieee80211_sdata_from_skb(local, skb);
480                 if (sdata) {
481                         if (ieee80211_is_nullfunc(hdr->frame_control) ||
482                             ieee80211_is_qos_nullfunc(hdr->frame_control))
483                                 cfg80211_probe_status(sdata->dev, hdr->addr1,
484                                                       cookie, acked,
485                                                       GFP_ATOMIC);
486                         else
487                                 cfg80211_mgmt_tx_status(&sdata->wdev, cookie,
488                                                         skb->data, skb->len,
489                                                         acked, GFP_ATOMIC);
490                 }
491                 rcu_read_unlock();
492
493                 dev_kfree_skb_any(skb);
494         } else {
495                 /* consumes skb */
496                 skb_complete_wifi_ack(skb, acked);
497         }
498 }
499
500 static void ieee80211_report_used_skb(struct ieee80211_local *local,
501                                       struct sk_buff *skb, bool dropped)
502 {
503         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
504         struct ieee80211_hdr *hdr = (void *)skb->data;
505         bool acked = info->flags & IEEE80211_TX_STAT_ACK;
506
507         if (dropped)
508                 acked = false;
509
510         if (info->flags & IEEE80211_TX_INTFL_MLME_CONN_TX) {
511                 struct ieee80211_sub_if_data *sdata;
512
513                 rcu_read_lock();
514
515                 sdata = ieee80211_sdata_from_skb(local, skb);
516
517                 if (!sdata) {
518                         skb->dev = NULL;
519                 } else {
520                         unsigned int hdr_size =
521                                 ieee80211_hdrlen(hdr->frame_control);
522
523                         /* Check to see if packet is a TDLS teardown packet */
524                         if (ieee80211_is_data(hdr->frame_control) &&
525                             (ieee80211_get_tdls_action(skb, hdr_size) ==
526                              WLAN_TDLS_TEARDOWN))
527                                 ieee80211_tdls_td_tx_handle(local, sdata, skb,
528                                                             info->flags);
529                         else
530                                 ieee80211_mgd_conn_tx_status(sdata,
531                                                              hdr->frame_control,
532                                                              acked);
533                 }
534
535                 rcu_read_unlock();
536         } else if (info->ack_frame_id) {
537                 ieee80211_report_ack_skb(local, info, acked, dropped);
538         }
539 }
540
541 /*
542  * Use a static threshold for now, best value to be determined
543  * by testing ...
544  * Should it depend on:
545  *  - on # of retransmissions
546  *  - current throughput (higher value for higher tpt)?
547  */
548 #define STA_LOST_PKT_THRESHOLD  50
549 #define STA_LOST_TDLS_PKT_THRESHOLD     10
550 #define STA_LOST_TDLS_PKT_TIME          (10*HZ) /* 10secs since last ACK */
551
552 static void ieee80211_lost_packet(struct sta_info *sta,
553                                   struct ieee80211_tx_info *info)
554 {
555         /* This packet was aggregated but doesn't carry status info */
556         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
557             !(info->flags & IEEE80211_TX_STAT_AMPDU))
558                 return;
559
560         sta->status_stats.lost_packets++;
561         if (!sta->sta.tdls &&
562             sta->status_stats.lost_packets < STA_LOST_PKT_THRESHOLD)
563                 return;
564
565         /*
566          * If we're in TDLS mode, make sure that all STA_LOST_TDLS_PKT_THRESHOLD
567          * of the last packets were lost, and that no ACK was received in the
568          * last STA_LOST_TDLS_PKT_TIME ms, before triggering the CQM packet-loss
569          * mechanism.
570          */
571         if (sta->sta.tdls &&
572             (sta->status_stats.lost_packets < STA_LOST_TDLS_PKT_THRESHOLD ||
573              time_before(jiffies,
574                          sta->status_stats.last_tdls_pkt_time +
575                          STA_LOST_TDLS_PKT_TIME)))
576                 return;
577
578         cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
579                                     sta->status_stats.lost_packets, GFP_ATOMIC);
580         sta->status_stats.lost_packets = 0;
581 }
582
583 static int ieee80211_tx_get_rates(struct ieee80211_hw *hw,
584                                   struct ieee80211_tx_info *info,
585                                   int *retry_count)
586 {
587         int rates_idx = -1;
588         int count = -1;
589         int i;
590
591         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
592                 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
593                     !(info->flags & IEEE80211_TX_STAT_AMPDU)) {
594                         /* just the first aggr frame carry status info */
595                         info->status.rates[i].idx = -1;
596                         info->status.rates[i].count = 0;
597                         break;
598                 } else if (info->status.rates[i].idx < 0) {
599                         break;
600                 } else if (i >= hw->max_report_rates) {
601                         /* the HW cannot have attempted that rate */
602                         info->status.rates[i].idx = -1;
603                         info->status.rates[i].count = 0;
604                         break;
605                 }
606
607                 count += info->status.rates[i].count;
608         }
609         rates_idx = i - 1;
610
611         if (count < 0)
612                 count = 0;
613
614         *retry_count = count;
615         return rates_idx;
616 }
617
618 void ieee80211_tx_status_noskb(struct ieee80211_hw *hw,
619                                struct ieee80211_sta *pubsta,
620                                struct ieee80211_tx_info *info)
621 {
622         struct ieee80211_local *local = hw_to_local(hw);
623         struct ieee80211_supported_band *sband;
624         int retry_count;
625         int rates_idx;
626         bool acked, noack_success;
627
628         rates_idx = ieee80211_tx_get_rates(hw, info, &retry_count);
629
630         sband = hw->wiphy->bands[info->band];
631
632         acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
633         noack_success = !!(info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED);
634
635         if (pubsta) {
636                 struct sta_info *sta;
637
638                 sta = container_of(pubsta, struct sta_info, sta);
639
640                 if (!acked)
641                         sta->status_stats.retry_failed++;
642                 sta->status_stats.retry_count += retry_count;
643
644                 if (acked) {
645                         sta->rx_stats.last_rx = jiffies;
646
647                         if (sta->status_stats.lost_packets)
648                                 sta->status_stats.lost_packets = 0;
649
650                         /* Track when last TDLS packet was ACKed */
651                         if (test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
652                                 sta->status_stats.last_tdls_pkt_time = jiffies;
653                 } else {
654                         ieee80211_lost_packet(sta, info);
655                 }
656
657                 rate_control_tx_status_noskb(local, sband, sta, info);
658         }
659
660         if (acked || noack_success) {
661                 I802_DEBUG_INC(local->dot11TransmittedFrameCount);
662                 if (!pubsta)
663                         I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
664                 if (retry_count > 0)
665                         I802_DEBUG_INC(local->dot11RetryCount);
666                 if (retry_count > 1)
667                         I802_DEBUG_INC(local->dot11MultipleRetryCount);
668         } else {
669                 I802_DEBUG_INC(local->dot11FailedCount);
670         }
671 }
672 EXPORT_SYMBOL(ieee80211_tx_status_noskb);
673
674 void ieee80211_tx_monitor(struct ieee80211_local *local, struct sk_buff *skb,
675                           struct ieee80211_supported_band *sband,
676                           int retry_count, int shift, bool send_to_cooked)
677 {
678         struct sk_buff *skb2;
679         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
680         struct ieee80211_sub_if_data *sdata;
681         struct net_device *prev_dev = NULL;
682         int rtap_len;
683
684         /* send frame to monitor interfaces now */
685         rtap_len = ieee80211_tx_radiotap_len(info);
686         if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) {
687                 pr_err("ieee80211_tx_status: headroom too small\n");
688                 dev_kfree_skb(skb);
689                 return;
690         }
691         ieee80211_add_tx_radiotap_header(local, sband, skb, retry_count,
692                                          rtap_len, shift);
693
694         /* XXX: is this sufficient for BPF? */
695         skb_set_mac_header(skb, 0);
696         skb->ip_summed = CHECKSUM_UNNECESSARY;
697         skb->pkt_type = PACKET_OTHERHOST;
698         skb->protocol = htons(ETH_P_802_2);
699         memset(skb->cb, 0, sizeof(skb->cb));
700
701         rcu_read_lock();
702         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
703                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
704                         if (!ieee80211_sdata_running(sdata))
705                                 continue;
706
707                         if ((sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) &&
708                             !send_to_cooked)
709                                 continue;
710
711                         if (prev_dev) {
712                                 skb2 = skb_clone(skb, GFP_ATOMIC);
713                                 if (skb2) {
714                                         skb2->dev = prev_dev;
715                                         netif_rx(skb2);
716                                 }
717                         }
718
719                         prev_dev = sdata->dev;
720                 }
721         }
722         if (prev_dev) {
723                 skb->dev = prev_dev;
724                 netif_rx(skb);
725                 skb = NULL;
726         }
727         rcu_read_unlock();
728         dev_kfree_skb(skb);
729 }
730
731 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
732 {
733         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
734         struct ieee80211_local *local = hw_to_local(hw);
735         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
736         __le16 fc;
737         struct ieee80211_supported_band *sband;
738         struct sta_info *sta;
739         struct rhash_head *tmp;
740         int retry_count;
741         int rates_idx;
742         bool send_to_cooked;
743         bool acked;
744         struct ieee80211_bar *bar;
745         int shift = 0;
746         int tid = IEEE80211_NUM_TIDS;
747         const struct bucket_table *tbl;
748
749         rates_idx = ieee80211_tx_get_rates(hw, info, &retry_count);
750
751         rcu_read_lock();
752
753         sband = local->hw.wiphy->bands[info->band];
754         fc = hdr->frame_control;
755
756         tbl = rht_dereference_rcu(local->sta_hash.tbl, &local->sta_hash);
757
758         for_each_sta_info(local, tbl, hdr->addr1, sta, tmp) {
759                 /* skip wrong virtual interface */
760                 if (!ether_addr_equal(hdr->addr2, sta->sdata->vif.addr))
761                         continue;
762
763                 shift = ieee80211_vif_get_shift(&sta->sdata->vif);
764
765                 if (info->flags & IEEE80211_TX_STATUS_EOSP)
766                         clear_sta_flag(sta, WLAN_STA_SP);
767
768                 acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
769                 if (!acked && test_sta_flag(sta, WLAN_STA_PS_STA)) {
770                         /*
771                          * The STA is in power save mode, so assume
772                          * that this TX packet failed because of that.
773                          */
774                         ieee80211_handle_filtered_frame(local, sta, skb);
775                         rcu_read_unlock();
776                         return;
777                 }
778
779                 /* mesh Peer Service Period support */
780                 if (ieee80211_vif_is_mesh(&sta->sdata->vif) &&
781                     ieee80211_is_data_qos(fc))
782                         ieee80211_mpsp_trigger_process(
783                                         ieee80211_get_qos_ctl(hdr),
784                                         sta, true, acked);
785
786                 if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL) &&
787                     (ieee80211_is_data(hdr->frame_control)) &&
788                     (rates_idx != -1))
789                         sta->tx_stats.last_rate =
790                                 info->status.rates[rates_idx];
791
792                 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
793                     (ieee80211_is_data_qos(fc))) {
794                         u16 ssn;
795                         u8 *qc;
796
797                         qc = ieee80211_get_qos_ctl(hdr);
798                         tid = qc[0] & 0xf;
799                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
800                                                 & IEEE80211_SCTL_SEQ);
801                         ieee80211_send_bar(&sta->sdata->vif, hdr->addr1,
802                                            tid, ssn);
803                 } else if (ieee80211_is_data_qos(fc)) {
804                         u8 *qc = ieee80211_get_qos_ctl(hdr);
805
806                         tid = qc[0] & 0xf;
807                 }
808
809                 if (!acked && ieee80211_is_back_req(fc)) {
810                         u16 control;
811
812                         /*
813                          * BAR failed, store the last SSN and retry sending
814                          * the BAR when the next unicast transmission on the
815                          * same TID succeeds.
816                          */
817                         bar = (struct ieee80211_bar *) skb->data;
818                         control = le16_to_cpu(bar->control);
819                         if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) {
820                                 u16 ssn = le16_to_cpu(bar->start_seq_num);
821
822                                 tid = (control &
823                                        IEEE80211_BAR_CTRL_TID_INFO_MASK) >>
824                                       IEEE80211_BAR_CTRL_TID_INFO_SHIFT;
825
826                                 ieee80211_set_bar_pending(sta, tid, ssn);
827                         }
828                 }
829
830                 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
831                         ieee80211_handle_filtered_frame(local, sta, skb);
832                         rcu_read_unlock();
833                         return;
834                 } else {
835                         if (!acked)
836                                 sta->status_stats.retry_failed++;
837                         sta->status_stats.retry_count += retry_count;
838
839                         if (ieee80211_is_data_present(fc)) {
840                                 if (!acked)
841                                         sta->status_stats.msdu_failed[tid]++;
842
843                                 sta->status_stats.msdu_retries[tid] +=
844                                         retry_count;
845                         }
846                 }
847
848                 rate_control_tx_status(local, sband, sta, skb);
849                 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
850                         ieee80211s_update_metric(local, sta, skb);
851
852                 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked)
853                         ieee80211_frame_acked(sta, skb);
854
855                 if ((sta->sdata->vif.type == NL80211_IFTYPE_STATION) &&
856                     ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
857                         ieee80211_sta_tx_notify(sta->sdata, (void *) skb->data,
858                                                 acked, info->status.tx_time);
859
860                 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
861                         if (info->flags & IEEE80211_TX_STAT_ACK) {
862                                 if (sta->status_stats.lost_packets)
863                                         sta->status_stats.lost_packets = 0;
864
865                                 /* Track when last TDLS packet was ACKed */
866                                 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
867                                         sta->status_stats.last_tdls_pkt_time =
868                                                 jiffies;
869                         } else {
870                                 ieee80211_lost_packet(sta, info);
871                         }
872                 }
873         }
874
875         rcu_read_unlock();
876
877         ieee80211_led_tx(local);
878
879         /* SNMP counters
880          * Fragments are passed to low-level drivers as separate skbs, so these
881          * are actually fragments, not frames. Update frame counters only for
882          * the first fragment of the frame. */
883         if ((info->flags & IEEE80211_TX_STAT_ACK) ||
884             (info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED)) {
885                 if (ieee80211_is_first_frag(hdr->seq_ctrl)) {
886                         I802_DEBUG_INC(local->dot11TransmittedFrameCount);
887                         if (is_multicast_ether_addr(ieee80211_get_DA(hdr)))
888                                 I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
889                         if (retry_count > 0)
890                                 I802_DEBUG_INC(local->dot11RetryCount);
891                         if (retry_count > 1)
892                                 I802_DEBUG_INC(local->dot11MultipleRetryCount);
893                 }
894
895                 /* This counter shall be incremented for an acknowledged MPDU
896                  * with an individual address in the address 1 field or an MPDU
897                  * with a multicast address in the address 1 field of type Data
898                  * or Management. */
899                 if (!is_multicast_ether_addr(hdr->addr1) ||
900                     ieee80211_is_data(fc) ||
901                     ieee80211_is_mgmt(fc))
902                         I802_DEBUG_INC(local->dot11TransmittedFragmentCount);
903         } else {
904                 if (ieee80211_is_first_frag(hdr->seq_ctrl))
905                         I802_DEBUG_INC(local->dot11FailedCount);
906         }
907
908         if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) &&
909             ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
910             !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
911             local->ps_sdata && !(local->scanning)) {
912                 if (info->flags & IEEE80211_TX_STAT_ACK) {
913                         local->ps_sdata->u.mgd.flags |=
914                                         IEEE80211_STA_NULLFUNC_ACKED;
915                 } else
916                         mod_timer(&local->dynamic_ps_timer, jiffies +
917                                         msecs_to_jiffies(10));
918         }
919
920         ieee80211_report_used_skb(local, skb, false);
921
922         /* this was a transmitted frame, but now we want to reuse it */
923         skb_orphan(skb);
924
925         /* Need to make a copy before skb->cb gets cleared */
926         send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) ||
927                          !(ieee80211_is_data(fc));
928
929         /*
930          * This is a bit racy but we can avoid a lot of work
931          * with this test...
932          */
933         if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) {
934                 dev_kfree_skb(skb);
935                 return;
936         }
937
938         /* send to monitor interfaces */
939         ieee80211_tx_monitor(local, skb, sband, retry_count, shift, send_to_cooked);
940 }
941 EXPORT_SYMBOL(ieee80211_tx_status);
942
943 void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets)
944 {
945         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
946         cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
947                                     num_packets, GFP_ATOMIC);
948 }
949 EXPORT_SYMBOL(ieee80211_report_low_ack);
950
951 void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb)
952 {
953         struct ieee80211_local *local = hw_to_local(hw);
954
955         ieee80211_report_used_skb(local, skb, true);
956         dev_kfree_skb_any(skb);
957 }
958 EXPORT_SYMBOL(ieee80211_free_txskb);
959
960 void ieee80211_purge_tx_queue(struct ieee80211_hw *hw,
961                               struct sk_buff_head *skbs)
962 {
963         struct sk_buff *skb;
964
965         while ((skb = __skb_dequeue(skbs)))
966                 ieee80211_free_txskb(hw, skb);
967 }