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 <linux/time.h>
16 #include <net/mac80211.h>
17 #include <asm/unaligned.h>
18 #include "ieee80211_i.h"
19 #include "rate.h"
20 #include "mesh.h"
21 #include "led.h"
22 #include "wme.h"
23
24
ieee80211_tx_status_irqsafe(struct ieee80211_hw * hw,struct sk_buff * skb)25 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
26 struct sk_buff *skb)
27 {
28 struct ieee80211_local *local = hw_to_local(hw);
29 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
30 int tmp;
31
32 skb->pkt_type = IEEE80211_TX_STATUS_MSG;
33 skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
34 &local->skb_queue : &local->skb_queue_unreliable, skb);
35 tmp = skb_queue_len(&local->skb_queue) +
36 skb_queue_len(&local->skb_queue_unreliable);
37 while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
38 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
39 ieee80211_free_txskb(hw, skb);
40 tmp--;
41 I802_DEBUG_INC(local->tx_status_drop);
42 }
43 tasklet_schedule(&local->tasklet);
44 }
45 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
46
ieee80211_handle_filtered_frame(struct ieee80211_local * local,struct sta_info * sta,struct sk_buff * skb)47 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
48 struct sta_info *sta,
49 struct sk_buff *skb)
50 {
51 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
52 struct ieee80211_hdr *hdr = (void *)skb->data;
53 int ac;
54
55 /*
56 * This skb 'survived' a round-trip through the driver, and
57 * hopefully the driver didn't mangle it too badly. However,
58 * we can definitely not rely on the control information
59 * being correct. Clear it so we don't get junk there, and
60 * indicate that it needs new processing, but must not be
61 * modified/encrypted again.
62 */
63 memset(&info->control, 0, sizeof(info->control));
64
65 info->control.jiffies = jiffies;
66 info->control.vif = &sta->sdata->vif;
67 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING |
68 IEEE80211_TX_INTFL_RETRANSMISSION;
69 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
70
71 sta->tx_filtered_count++;
72
73 /*
74 * Clear more-data bit on filtered frames, it might be set
75 * but later frames might time out so it might have to be
76 * clear again ... It's all rather unlikely (this frame
77 * should time out first, right?) but let's not confuse
78 * peers unnecessarily.
79 */
80 if (hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_MOREDATA))
81 hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_MOREDATA);
82
83 if (ieee80211_is_data_qos(hdr->frame_control)) {
84 u8 *p = ieee80211_get_qos_ctl(hdr);
85 int tid = *p & IEEE80211_QOS_CTL_TID_MASK;
86
87 /*
88 * Clear EOSP if set, this could happen e.g.
89 * if an absence period (us being a P2P GO)
90 * shortens the SP.
91 */
92 if (*p & IEEE80211_QOS_CTL_EOSP)
93 *p &= ~IEEE80211_QOS_CTL_EOSP;
94 ac = ieee802_1d_to_ac[tid & 7];
95 } else {
96 ac = IEEE80211_AC_BE;
97 }
98
99 /*
100 * Clear the TX filter mask for this STA when sending the next
101 * packet. If the STA went to power save mode, this will happen
102 * when it wakes up for the next time.
103 */
104 set_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT);
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
ieee80211_check_pending_bar(struct sta_info * sta,u8 * addr,u8 tid)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
ieee80211_frame_acked(struct sta_info * sta,struct sk_buff * skb)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 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
186 sta->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
ieee80211_set_bar_pending(struct sta_info * sta,u8 tid,u16 ssn)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
ieee80211_tx_radiotap_len(struct ieee80211_tx_info * info)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
ieee80211_add_tx_radiotap_header(struct ieee80211_local * local,struct ieee80211_supported_band * sband,struct sk_buff * skb,int retry_count,int rtap_len,int shift)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
ieee80211_report_used_skb(struct ieee80211_local * local,struct sk_buff * skb,bool dropped)393 static void ieee80211_report_used_skb(struct ieee80211_local *local,
394 struct sk_buff *skb, bool dropped)
395 {
396 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
397 struct ieee80211_hdr *hdr = (void *)skb->data;
398 bool acked = info->flags & IEEE80211_TX_STAT_ACK;
399
400 if (dropped)
401 acked = false;
402
403 if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX |
404 IEEE80211_TX_INTFL_MLME_CONN_TX)) {
405 struct ieee80211_sub_if_data *sdata = NULL;
406 struct ieee80211_sub_if_data *iter_sdata;
407 u64 cookie = (unsigned long)skb;
408
409 rcu_read_lock();
410
411 if (skb->dev) {
412 list_for_each_entry_rcu(iter_sdata, &local->interfaces,
413 list) {
414 if (!iter_sdata->dev)
415 continue;
416
417 if (skb->dev == iter_sdata->dev) {
418 sdata = iter_sdata;
419 break;
420 }
421 }
422 } else {
423 sdata = rcu_dereference(local->p2p_sdata);
424 }
425
426 if (!sdata) {
427 skb->dev = NULL;
428 } else if (info->flags & IEEE80211_TX_INTFL_MLME_CONN_TX) {
429 ieee80211_mgd_conn_tx_status(sdata, hdr->frame_control,
430 acked);
431 } else if (ieee80211_is_nullfunc(hdr->frame_control) ||
432 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
433 cfg80211_probe_status(sdata->dev, hdr->addr1,
434 cookie, acked, GFP_ATOMIC);
435 } else {
436 cfg80211_mgmt_tx_status(&sdata->wdev, cookie, skb->data,
437 skb->len, acked, GFP_ATOMIC);
438 }
439
440 rcu_read_unlock();
441 }
442
443 if (unlikely(info->ack_frame_id)) {
444 struct sk_buff *ack_skb;
445 unsigned long flags;
446
447 spin_lock_irqsave(&local->ack_status_lock, flags);
448 ack_skb = idr_find(&local->ack_status_frames,
449 info->ack_frame_id);
450 if (ack_skb)
451 idr_remove(&local->ack_status_frames,
452 info->ack_frame_id);
453 spin_unlock_irqrestore(&local->ack_status_lock, flags);
454
455 if (ack_skb) {
456 if (!dropped) {
457 /* consumes ack_skb */
458 skb_complete_wifi_ack(ack_skb, acked);
459 } else {
460 dev_kfree_skb_any(ack_skb);
461 }
462 }
463 }
464 }
465
466 /*
467 * Measure Tx frame completion and removal time for Tx latency statistics
468 * calculation. A single Tx frame latency should be measured from when it
469 * is entering the Kernel until we receive Tx complete confirmation indication
470 * and remove the skb.
471 */
ieee80211_tx_latency_end_msrmnt(struct ieee80211_local * local,struct sk_buff * skb,struct sta_info * sta,struct ieee80211_hdr * hdr)472 static void ieee80211_tx_latency_end_msrmnt(struct ieee80211_local *local,
473 struct sk_buff *skb,
474 struct sta_info *sta,
475 struct ieee80211_hdr *hdr)
476 {
477 u32 msrmnt;
478 u16 tid;
479 u8 *qc;
480 int i, bin_range_count;
481 u32 *bin_ranges;
482 __le16 fc;
483 struct ieee80211_tx_latency_stat *tx_lat;
484 struct ieee80211_tx_latency_bin_ranges *tx_latency;
485 ktime_t skb_arv = skb->tstamp;
486
487 tx_latency = rcu_dereference(local->tx_latency);
488
489 /* assert Tx latency stats are enabled & frame arrived when enabled */
490 if (!tx_latency || !ktime_to_ns(skb_arv))
491 return;
492
493 fc = hdr->frame_control;
494
495 if (!ieee80211_is_data(fc)) /* make sure it is a data frame */
496 return;
497
498 /* get frame tid */
499 if (ieee80211_is_data_qos(hdr->frame_control)) {
500 qc = ieee80211_get_qos_ctl(hdr);
501 tid = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
502 } else {
503 tid = 0;
504 }
505
506 tx_lat = &sta->tx_lat[tid];
507
508 /* Calculate the latency */
509 msrmnt = ktime_to_ms(ktime_sub(ktime_get(), skb_arv));
510
511 if (tx_lat->max < msrmnt) /* update stats */
512 tx_lat->max = msrmnt;
513 tx_lat->counter++;
514 tx_lat->sum += msrmnt;
515
516 if (!tx_lat->bins) /* bins not activated */
517 return;
518
519 /* count how many Tx frames transmitted with the appropriate latency */
520 bin_range_count = tx_latency->n_ranges;
521 bin_ranges = tx_latency->ranges;
522
523 for (i = 0; i < bin_range_count; i++) {
524 if (msrmnt <= bin_ranges[i]) {
525 tx_lat->bins[i]++;
526 break;
527 }
528 }
529 if (i == bin_range_count) /* msrmnt is bigger than the biggest range */
530 tx_lat->bins[i]++;
531 }
532
533 /*
534 * Use a static threshold for now, best value to be determined
535 * by testing ...
536 * Should it depend on:
537 * - on # of retransmissions
538 * - current throughput (higher value for higher tpt)?
539 */
540 #define STA_LOST_PKT_THRESHOLD 50
541 #define STA_LOST_TDLS_PKT_THRESHOLD 10
542 #define STA_LOST_TDLS_PKT_TIME (10*HZ) /* 10secs since last ACK */
543
ieee80211_lost_packet(struct sta_info * sta,struct sk_buff * skb)544 static void ieee80211_lost_packet(struct sta_info *sta, struct sk_buff *skb)
545 {
546 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
547
548 /* This packet was aggregated but doesn't carry status info */
549 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
550 !(info->flags & IEEE80211_TX_STAT_AMPDU))
551 return;
552
553 sta->lost_packets++;
554 if (!sta->sta.tdls && sta->lost_packets < STA_LOST_PKT_THRESHOLD)
555 return;
556
557 /*
558 * If we're in TDLS mode, make sure that all STA_LOST_TDLS_PKT_THRESHOLD
559 * of the last packets were lost, and that no ACK was received in the
560 * last STA_LOST_TDLS_PKT_TIME ms, before triggering the CQM packet-loss
561 * mechanism.
562 */
563 if (sta->sta.tdls &&
564 (sta->lost_packets < STA_LOST_TDLS_PKT_THRESHOLD ||
565 time_before(jiffies,
566 sta->last_tdls_pkt_time + STA_LOST_TDLS_PKT_TIME)))
567 return;
568
569 cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
570 sta->lost_packets, GFP_ATOMIC);
571 sta->lost_packets = 0;
572 }
573
ieee80211_tx_status(struct ieee80211_hw * hw,struct sk_buff * skb)574 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
575 {
576 struct sk_buff *skb2;
577 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
578 struct ieee80211_local *local = hw_to_local(hw);
579 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
580 __le16 fc;
581 struct ieee80211_supported_band *sband;
582 struct ieee80211_sub_if_data *sdata;
583 struct net_device *prev_dev = NULL;
584 struct sta_info *sta, *tmp;
585 int retry_count = -1, i;
586 int rates_idx = -1;
587 bool send_to_cooked;
588 bool acked;
589 struct ieee80211_bar *bar;
590 int rtap_len;
591 int shift = 0;
592
593 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
594 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
595 !(info->flags & IEEE80211_TX_STAT_AMPDU)) {
596 /* just the first aggr frame carry status info */
597 info->status.rates[i].idx = -1;
598 info->status.rates[i].count = 0;
599 break;
600 } else if (info->status.rates[i].idx < 0) {
601 break;
602 } else if (i >= hw->max_report_rates) {
603 /* the HW cannot have attempted that rate */
604 info->status.rates[i].idx = -1;
605 info->status.rates[i].count = 0;
606 break;
607 }
608
609 retry_count += info->status.rates[i].count;
610 }
611 rates_idx = i - 1;
612
613 if (retry_count < 0)
614 retry_count = 0;
615
616 rcu_read_lock();
617
618 sband = local->hw.wiphy->bands[info->band];
619 fc = hdr->frame_control;
620
621 for_each_sta_info(local, hdr->addr1, sta, tmp) {
622 /* skip wrong virtual interface */
623 if (!ether_addr_equal(hdr->addr2, sta->sdata->vif.addr))
624 continue;
625
626 shift = ieee80211_vif_get_shift(&sta->sdata->vif);
627
628 if (info->flags & IEEE80211_TX_STATUS_EOSP)
629 clear_sta_flag(sta, WLAN_STA_SP);
630
631 acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
632 if (!acked && test_sta_flag(sta, WLAN_STA_PS_STA)) {
633 /*
634 * The STA is in power save mode, so assume
635 * that this TX packet failed because of that.
636 */
637 ieee80211_handle_filtered_frame(local, sta, skb);
638 rcu_read_unlock();
639 return;
640 }
641
642 /* mesh Peer Service Period support */
643 if (ieee80211_vif_is_mesh(&sta->sdata->vif) &&
644 ieee80211_is_data_qos(fc))
645 ieee80211_mpsp_trigger_process(
646 ieee80211_get_qos_ctl(hdr),
647 sta, true, acked);
648
649 if ((local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) &&
650 (ieee80211_is_data(hdr->frame_control)) &&
651 (rates_idx != -1))
652 sta->last_tx_rate = info->status.rates[rates_idx];
653
654 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
655 (ieee80211_is_data_qos(fc))) {
656 u16 tid, ssn;
657 u8 *qc;
658
659 qc = ieee80211_get_qos_ctl(hdr);
660 tid = qc[0] & 0xf;
661 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
662 & IEEE80211_SCTL_SEQ);
663 ieee80211_send_bar(&sta->sdata->vif, hdr->addr1,
664 tid, ssn);
665 }
666
667 if (!acked && ieee80211_is_back_req(fc)) {
668 u16 tid, control;
669
670 /*
671 * BAR failed, store the last SSN and retry sending
672 * the BAR when the next unicast transmission on the
673 * same TID succeeds.
674 */
675 bar = (struct ieee80211_bar *) skb->data;
676 control = le16_to_cpu(bar->control);
677 if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) {
678 u16 ssn = le16_to_cpu(bar->start_seq_num);
679
680 tid = (control &
681 IEEE80211_BAR_CTRL_TID_INFO_MASK) >>
682 IEEE80211_BAR_CTRL_TID_INFO_SHIFT;
683
684 ieee80211_set_bar_pending(sta, tid, ssn);
685 }
686 }
687
688 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
689 ieee80211_handle_filtered_frame(local, sta, skb);
690 rcu_read_unlock();
691 return;
692 } else {
693 if (!acked)
694 sta->tx_retry_failed++;
695 sta->tx_retry_count += retry_count;
696 }
697
698 rate_control_tx_status(local, sband, sta, skb);
699 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
700 ieee80211s_update_metric(local, sta, skb);
701
702 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked)
703 ieee80211_frame_acked(sta, skb);
704
705 if ((sta->sdata->vif.type == NL80211_IFTYPE_STATION) &&
706 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
707 ieee80211_sta_tx_notify(sta->sdata, (void *) skb->data, acked);
708
709 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
710 if (info->flags & IEEE80211_TX_STAT_ACK) {
711 if (sta->lost_packets)
712 sta->lost_packets = 0;
713
714 /* Track when last TDLS packet was ACKed */
715 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
716 sta->last_tdls_pkt_time = jiffies;
717 } else {
718 ieee80211_lost_packet(sta, skb);
719 }
720 }
721
722 if (acked)
723 sta->last_ack_signal = info->status.ack_signal;
724
725 /*
726 * Measure frame removal for tx latency
727 * statistics calculation
728 */
729 ieee80211_tx_latency_end_msrmnt(local, skb, sta, hdr);
730 }
731
732 rcu_read_unlock();
733
734 ieee80211_led_tx(local);
735
736 /* SNMP counters
737 * Fragments are passed to low-level drivers as separate skbs, so these
738 * are actually fragments, not frames. Update frame counters only for
739 * the first fragment of the frame. */
740 if (info->flags & IEEE80211_TX_STAT_ACK) {
741 if (ieee80211_is_first_frag(hdr->seq_ctrl)) {
742 local->dot11TransmittedFrameCount++;
743 if (is_multicast_ether_addr(hdr->addr1))
744 local->dot11MulticastTransmittedFrameCount++;
745 if (retry_count > 0)
746 local->dot11RetryCount++;
747 if (retry_count > 1)
748 local->dot11MultipleRetryCount++;
749 }
750
751 /* This counter shall be incremented for an acknowledged MPDU
752 * with an individual address in the address 1 field or an MPDU
753 * with a multicast address in the address 1 field of type Data
754 * or Management. */
755 if (!is_multicast_ether_addr(hdr->addr1) ||
756 ieee80211_is_data(fc) ||
757 ieee80211_is_mgmt(fc))
758 local->dot11TransmittedFragmentCount++;
759 } else {
760 if (ieee80211_is_first_frag(hdr->seq_ctrl))
761 local->dot11FailedCount++;
762 }
763
764 if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) &&
765 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
766 !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
767 local->ps_sdata && !(local->scanning)) {
768 if (info->flags & IEEE80211_TX_STAT_ACK) {
769 local->ps_sdata->u.mgd.flags |=
770 IEEE80211_STA_NULLFUNC_ACKED;
771 } else
772 mod_timer(&local->dynamic_ps_timer, jiffies +
773 msecs_to_jiffies(10));
774 }
775
776 ieee80211_report_used_skb(local, skb, false);
777
778 /* this was a transmitted frame, but now we want to reuse it */
779 skb_orphan(skb);
780
781 /* Need to make a copy before skb->cb gets cleared */
782 send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) ||
783 !(ieee80211_is_data(fc));
784
785 /*
786 * This is a bit racy but we can avoid a lot of work
787 * with this test...
788 */
789 if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) {
790 dev_kfree_skb(skb);
791 return;
792 }
793
794 /* send frame to monitor interfaces now */
795 rtap_len = ieee80211_tx_radiotap_len(info);
796 if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) {
797 pr_err("ieee80211_tx_status: headroom too small\n");
798 dev_kfree_skb(skb);
799 return;
800 }
801 ieee80211_add_tx_radiotap_header(local, sband, skb, retry_count,
802 rtap_len, shift);
803
804 /* XXX: is this sufficient for BPF? */
805 skb_set_mac_header(skb, 0);
806 skb->ip_summed = CHECKSUM_UNNECESSARY;
807 skb->pkt_type = PACKET_OTHERHOST;
808 skb->protocol = htons(ETH_P_802_2);
809 memset(skb->cb, 0, sizeof(skb->cb));
810
811 rcu_read_lock();
812 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
813 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
814 if (!ieee80211_sdata_running(sdata))
815 continue;
816
817 if ((sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) &&
818 !send_to_cooked)
819 continue;
820
821 if (prev_dev) {
822 skb2 = skb_clone(skb, GFP_ATOMIC);
823 if (skb2) {
824 skb2->dev = prev_dev;
825 netif_rx(skb2);
826 }
827 }
828
829 prev_dev = sdata->dev;
830 }
831 }
832 if (prev_dev) {
833 skb->dev = prev_dev;
834 netif_rx(skb);
835 skb = NULL;
836 }
837 rcu_read_unlock();
838 dev_kfree_skb(skb);
839 }
840 EXPORT_SYMBOL(ieee80211_tx_status);
841
ieee80211_report_low_ack(struct ieee80211_sta * pubsta,u32 num_packets)842 void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets)
843 {
844 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
845 cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
846 num_packets, GFP_ATOMIC);
847 }
848 EXPORT_SYMBOL(ieee80211_report_low_ack);
849
ieee80211_free_txskb(struct ieee80211_hw * hw,struct sk_buff * skb)850 void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb)
851 {
852 struct ieee80211_local *local = hw_to_local(hw);
853
854 ieee80211_report_used_skb(local, skb, true);
855 dev_kfree_skb_any(skb);
856 }
857 EXPORT_SYMBOL(ieee80211_free_txskb);
858
ieee80211_purge_tx_queue(struct ieee80211_hw * hw,struct sk_buff_head * skbs)859 void ieee80211_purge_tx_queue(struct ieee80211_hw *hw,
860 struct sk_buff_head *skbs)
861 {
862 struct sk_buff *skb;
863
864 while ((skb = __skb_dequeue(skbs)))
865 ieee80211_free_txskb(hw, skb);
866 }
867