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
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.
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"
24 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
27 struct ieee80211_local *local = hw_to_local(hw);
28 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
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);
40 I802_DEBUG_INC(local->tx_status_drop);
42 tasklet_schedule(&local->tasklet);
44 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
46 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
50 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
51 struct ieee80211_hdr *hdr = (void *)skb->data;
54 if (info->flags & (IEEE80211_TX_CTL_NO_PS_BUFFER |
55 IEEE80211_TX_CTL_AMPDU)) {
56 ieee80211_free_txskb(&local->hw, skb);
61 * This skb 'survived' a round-trip through the driver, and
62 * hopefully the driver didn't mangle it too badly. However,
63 * we can definitely not rely on the control information
64 * being correct. Clear it so we don't get junk there, and
65 * indicate that it needs new processing, but must not be
66 * modified/encrypted again.
68 memset(&info->control, 0, sizeof(info->control));
70 info->control.jiffies = jiffies;
71 info->control.vif = &sta->sdata->vif;
72 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING |
73 IEEE80211_TX_INTFL_RETRANSMISSION;
74 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
76 sta->status_stats.filtered++;
79 * Clear more-data bit on filtered frames, it might be set
80 * but later frames might time out so it might have to be
81 * clear again ... It's all rather unlikely (this frame
82 * should time out first, right?) but let's not confuse
83 * peers unnecessarily.
85 if (hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_MOREDATA))
86 hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_MOREDATA);
88 if (ieee80211_is_data_qos(hdr->frame_control)) {
89 u8 *p = ieee80211_get_qos_ctl(hdr);
90 int tid = *p & IEEE80211_QOS_CTL_TID_MASK;
93 * Clear EOSP if set, this could happen e.g.
94 * if an absence period (us being a P2P GO)
97 if (*p & IEEE80211_QOS_CTL_EOSP)
98 *p &= ~IEEE80211_QOS_CTL_EOSP;
99 ac = ieee80211_ac_from_tid(tid);
101 ac = IEEE80211_AC_BE;
105 * Clear the TX filter mask for this STA when sending the next
106 * packet. If the STA went to power save mode, this will happen
107 * when it wakes up for the next time.
109 set_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT);
110 ieee80211_clear_fast_xmit(sta);
113 * This code races in the following way:
115 * (1) STA sends frame indicating it will go to sleep and does so
116 * (2) hardware/firmware adds STA to filter list, passes frame up
117 * (3) hardware/firmware processes TX fifo and suppresses a frame
118 * (4) we get TX status before having processed the frame and
119 * knowing that the STA has gone to sleep.
121 * This is actually quite unlikely even when both those events are
122 * processed from interrupts coming in quickly after one another or
123 * even at the same time because we queue both TX status events and
124 * RX frames to be processed by a tasklet and process them in the
125 * same order that they were received or TX status last. Hence, there
126 * is no race as long as the frame RX is processed before the next TX
127 * status, which drivers can ensure, see below.
129 * Note that this can only happen if the hardware or firmware can
130 * actually add STAs to the filter list, if this is done by the
131 * driver in response to set_tim() (which will only reduce the race
132 * this whole filtering tries to solve, not completely solve it)
133 * this situation cannot happen.
135 * To completely solve this race drivers need to make sure that they
136 * (a) don't mix the irq-safe/not irq-safe TX status/RX processing
138 * (b) always process RX events before TX status events if ordering
139 * can be unknown, for example with different interrupt status
141 * (c) if PS mode transitions are manual (i.e. the flag
142 * %IEEE80211_HW_AP_LINK_PS is set), always process PS state
143 * changes before calling TX status events if ordering can be
146 if (test_sta_flag(sta, WLAN_STA_PS_STA) &&
147 skb_queue_len(&sta->tx_filtered[ac]) < STA_MAX_TX_BUFFER) {
148 skb_queue_tail(&sta->tx_filtered[ac], skb);
149 sta_info_recalc_tim(sta);
151 if (!timer_pending(&local->sta_cleanup))
152 mod_timer(&local->sta_cleanup,
153 round_jiffies(jiffies +
154 STA_INFO_CLEANUP_INTERVAL));
158 if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
159 !(info->flags & IEEE80211_TX_INTFL_RETRIED)) {
160 /* Software retry the packet once */
161 info->flags |= IEEE80211_TX_INTFL_RETRIED;
162 ieee80211_add_pending_skb(local, skb);
166 ps_dbg_ratelimited(sta->sdata,
167 "dropped TX filtered frame, queue_len=%d PS=%d @%lu\n",
168 skb_queue_len(&sta->tx_filtered[ac]),
169 !!test_sta_flag(sta, WLAN_STA_PS_STA), jiffies);
170 ieee80211_free_txskb(&local->hw, skb);
173 static void ieee80211_check_pending_bar(struct sta_info *sta, u8 *addr, u8 tid)
175 struct tid_ampdu_tx *tid_tx;
177 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
178 if (!tid_tx || !tid_tx->bar_pending)
181 tid_tx->bar_pending = false;
182 ieee80211_send_bar(&sta->sdata->vif, addr, tid, tid_tx->failed_bar_ssn);
185 static void ieee80211_frame_acked(struct sta_info *sta, struct sk_buff *skb)
187 struct ieee80211_mgmt *mgmt = (void *) skb->data;
188 struct ieee80211_local *local = sta->local;
189 struct ieee80211_sub_if_data *sdata = sta->sdata;
191 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
192 sta->status_stats.last_ack = jiffies;
194 if (ieee80211_is_data_qos(mgmt->frame_control)) {
195 struct ieee80211_hdr *hdr = (void *) skb->data;
196 u8 *qc = ieee80211_get_qos_ctl(hdr);
197 u16 tid = qc[0] & 0xf;
199 ieee80211_check_pending_bar(sta, hdr->addr1, tid);
202 if (ieee80211_is_action(mgmt->frame_control) &&
203 mgmt->u.action.category == WLAN_CATEGORY_HT &&
204 mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS &&
205 ieee80211_sdata_running(sdata)) {
206 enum ieee80211_smps_mode smps_mode;
208 switch (mgmt->u.action.u.ht_smps.smps_control) {
209 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
210 smps_mode = IEEE80211_SMPS_DYNAMIC;
212 case WLAN_HT_SMPS_CONTROL_STATIC:
213 smps_mode = IEEE80211_SMPS_STATIC;
215 case WLAN_HT_SMPS_CONTROL_DISABLED:
216 default: /* shouldn't happen since we don't send that */
217 smps_mode = IEEE80211_SMPS_OFF;
221 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
223 * This update looks racy, but isn't -- if we come
224 * here we've definitely got a station that we're
225 * talking to, and on a managed interface that can
226 * only be the AP. And the only other place updating
227 * this variable in managed mode is before association.
229 sdata->smps_mode = smps_mode;
230 ieee80211_queue_work(&local->hw, &sdata->recalc_smps);
231 } else if (sdata->vif.type == NL80211_IFTYPE_AP ||
232 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
233 sta->known_smps_mode = smps_mode;
238 static void ieee80211_set_bar_pending(struct sta_info *sta, u8 tid, u16 ssn)
240 struct tid_ampdu_tx *tid_tx;
242 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
246 tid_tx->failed_bar_ssn = ssn;
247 tid_tx->bar_pending = true;
250 static int ieee80211_tx_radiotap_len(struct ieee80211_tx_info *info)
252 int len = sizeof(struct ieee80211_radiotap_header);
254 /* IEEE80211_RADIOTAP_RATE rate */
255 if (info->status.rates[0].idx >= 0 &&
256 !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS |
257 IEEE80211_TX_RC_VHT_MCS)))
260 /* IEEE80211_RADIOTAP_TX_FLAGS */
263 /* IEEE80211_RADIOTAP_DATA_RETRIES */
266 /* IEEE80211_RADIOTAP_MCS
267 * IEEE80211_RADIOTAP_VHT */
268 if (info->status.rates[0].idx >= 0) {
269 if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS)
271 else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS)
272 len = ALIGN(len, 2) + 12;
279 ieee80211_add_tx_radiotap_header(struct ieee80211_local *local,
280 struct ieee80211_supported_band *sband,
281 struct sk_buff *skb, int retry_count,
282 int rtap_len, int shift)
284 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
285 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
286 struct ieee80211_radiotap_header *rthdr;
290 rthdr = (struct ieee80211_radiotap_header *) skb_push(skb, rtap_len);
292 memset(rthdr, 0, rtap_len);
293 rthdr->it_len = cpu_to_le16(rtap_len);
295 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
296 (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
297 pos = (unsigned char *)(rthdr + 1);
300 * XXX: Once radiotap gets the bitmap reset thing the vendor
301 * extensions proposal contains, we can actually report
302 * the whole set of tries we did.
305 /* IEEE80211_RADIOTAP_RATE */
306 if (info->status.rates[0].idx >= 0 &&
307 !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS |
308 IEEE80211_TX_RC_VHT_MCS))) {
311 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
312 rate = sband->bitrates[info->status.rates[0].idx].bitrate;
313 *pos = DIV_ROUND_UP(rate, 5 * (1 << shift));
314 /* padding for tx flags */
318 /* IEEE80211_RADIOTAP_TX_FLAGS */
320 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
321 !is_multicast_ether_addr(hdr->addr1))
322 txflags |= IEEE80211_RADIOTAP_F_TX_FAIL;
324 if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
325 txflags |= IEEE80211_RADIOTAP_F_TX_CTS;
326 if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
327 txflags |= IEEE80211_RADIOTAP_F_TX_RTS;
329 put_unaligned_le16(txflags, pos);
332 /* IEEE80211_RADIOTAP_DATA_RETRIES */
333 /* for now report the total retry_count */
337 if (info->status.rates[0].idx < 0)
340 /* IEEE80211_RADIOTAP_MCS
341 * IEEE80211_RADIOTAP_VHT */
342 if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS) {
343 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
344 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
345 IEEE80211_RADIOTAP_MCS_HAVE_GI |
346 IEEE80211_RADIOTAP_MCS_HAVE_BW;
347 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
348 pos[1] |= IEEE80211_RADIOTAP_MCS_SGI;
349 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
350 pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40;
351 if (info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)
352 pos[1] |= IEEE80211_RADIOTAP_MCS_FMT_GF;
353 pos[2] = info->status.rates[0].idx;
355 } else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS) {
356 u16 known = local->hw.radiotap_vht_details &
357 (IEEE80211_RADIOTAP_VHT_KNOWN_GI |
358 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH);
360 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
362 /* required alignment from rthdr */
363 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
365 /* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */
366 put_unaligned_le16(known, pos);
369 /* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */
370 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
371 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
375 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
377 else if (info->status.rates[0].flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
379 else if (info->status.rates[0].flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
381 else /* IEEE80211_TX_RC_{20_MHZ_WIDTH,FIXME:DUP_DATA} */
386 *pos = (ieee80211_rate_get_vht_mcs(&info->status.rates[0]) << 4) |
387 ieee80211_rate_get_vht_nss(&info->status.rates[0]);
394 /* u16 partial_aid */
400 * Handles the tx for TDLS teardown frames.
401 * If the frame wasn't ACKed by the peer - it will be re-sent through the AP
403 static void ieee80211_tdls_td_tx_handle(struct ieee80211_local *local,
404 struct ieee80211_sub_if_data *sdata,
405 struct sk_buff *skb, u32 flags)
407 struct sk_buff *teardown_skb;
408 struct sk_buff *orig_teardown_skb;
409 bool is_teardown = false;
411 /* Get the teardown data we need and free the lock */
412 spin_lock(&sdata->u.mgd.teardown_lock);
413 teardown_skb = sdata->u.mgd.teardown_skb;
414 orig_teardown_skb = sdata->u.mgd.orig_teardown_skb;
415 if ((skb == orig_teardown_skb) && teardown_skb) {
416 sdata->u.mgd.teardown_skb = NULL;
417 sdata->u.mgd.orig_teardown_skb = NULL;
420 spin_unlock(&sdata->u.mgd.teardown_lock);
423 /* This mechanism relies on being able to get ACKs */
424 WARN_ON(!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS));
426 /* Check if peer has ACKed */
427 if (flags & IEEE80211_TX_STAT_ACK) {
428 dev_kfree_skb_any(teardown_skb);
431 "TDLS Resending teardown through AP\n");
433 ieee80211_subif_start_xmit(teardown_skb, skb->dev);
438 static struct ieee80211_sub_if_data *
439 ieee80211_sdata_from_skb(struct ieee80211_local *local, struct sk_buff *skb)
441 struct ieee80211_sub_if_data *sdata;
444 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
448 if (skb->dev == sdata->dev)
455 return rcu_dereference(local->p2p_sdata);
458 static void ieee80211_report_ack_skb(struct ieee80211_local *local,
459 struct ieee80211_tx_info *info,
460 bool acked, bool dropped)
465 spin_lock_irqsave(&local->ack_status_lock, flags);
466 skb = idr_remove(&local->ack_status_frames, info->ack_frame_id);
467 spin_unlock_irqrestore(&local->ack_status_lock, flags);
473 dev_kfree_skb_any(skb);
477 if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX) {
478 u64 cookie = IEEE80211_SKB_CB(skb)->ack.cookie;
479 struct ieee80211_sub_if_data *sdata;
480 struct ieee80211_hdr *hdr = (void *)skb->data;
483 sdata = ieee80211_sdata_from_skb(local, skb);
485 if (ieee80211_is_nullfunc(hdr->frame_control) ||
486 ieee80211_is_qos_nullfunc(hdr->frame_control))
487 cfg80211_probe_status(sdata->dev, hdr->addr1,
491 cfg80211_mgmt_tx_status(&sdata->wdev, cookie,
497 dev_kfree_skb_any(skb);
500 skb_complete_wifi_ack(skb, acked);
504 static void ieee80211_report_used_skb(struct ieee80211_local *local,
505 struct sk_buff *skb, bool dropped)
507 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
508 struct ieee80211_hdr *hdr = (void *)skb->data;
509 bool acked = info->flags & IEEE80211_TX_STAT_ACK;
514 if (info->flags & IEEE80211_TX_INTFL_MLME_CONN_TX) {
515 struct ieee80211_sub_if_data *sdata;
519 sdata = ieee80211_sdata_from_skb(local, skb);
524 unsigned int hdr_size =
525 ieee80211_hdrlen(hdr->frame_control);
527 /* Check to see if packet is a TDLS teardown packet */
528 if (ieee80211_is_data(hdr->frame_control) &&
529 (ieee80211_get_tdls_action(skb, hdr_size) ==
531 ieee80211_tdls_td_tx_handle(local, sdata, skb,
534 ieee80211_mgd_conn_tx_status(sdata,
540 } else if (info->ack_frame_id) {
541 ieee80211_report_ack_skb(local, info, acked, dropped);
544 if (!dropped && skb->destructor) {
545 skb->wifi_acked_valid = 1;
546 skb->wifi_acked = acked;
551 * Use a static threshold for now, best value to be determined
553 * Should it depend on:
554 * - on # of retransmissions
555 * - current throughput (higher value for higher tpt)?
557 #define STA_LOST_PKT_THRESHOLD 50
558 #define STA_LOST_TDLS_PKT_THRESHOLD 10
559 #define STA_LOST_TDLS_PKT_TIME (10*HZ) /* 10secs since last ACK */
561 static void ieee80211_lost_packet(struct sta_info *sta,
562 struct ieee80211_tx_info *info)
564 /* If driver relies on its own algorithm for station kickout, skip
565 * mac80211 packet loss mechanism.
567 if (ieee80211_hw_check(&sta->local->hw, REPORTS_LOW_ACK))
570 /* This packet was aggregated but doesn't carry status info */
571 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
572 !(info->flags & IEEE80211_TX_STAT_AMPDU))
575 sta->status_stats.lost_packets++;
576 if (!sta->sta.tdls &&
577 sta->status_stats.lost_packets < STA_LOST_PKT_THRESHOLD)
581 * If we're in TDLS mode, make sure that all STA_LOST_TDLS_PKT_THRESHOLD
582 * of the last packets were lost, and that no ACK was received in the
583 * last STA_LOST_TDLS_PKT_TIME ms, before triggering the CQM packet-loss
587 (sta->status_stats.lost_packets < STA_LOST_TDLS_PKT_THRESHOLD ||
589 sta->status_stats.last_tdls_pkt_time +
590 STA_LOST_TDLS_PKT_TIME)))
593 cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
594 sta->status_stats.lost_packets, GFP_ATOMIC);
595 sta->status_stats.lost_packets = 0;
598 static int ieee80211_tx_get_rates(struct ieee80211_hw *hw,
599 struct ieee80211_tx_info *info,
606 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
607 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
608 !(info->flags & IEEE80211_TX_STAT_AMPDU)) {
609 /* just the first aggr frame carry status info */
610 info->status.rates[i].idx = -1;
611 info->status.rates[i].count = 0;
613 } else if (info->status.rates[i].idx < 0) {
615 } else if (i >= hw->max_report_rates) {
616 /* the HW cannot have attempted that rate */
617 info->status.rates[i].idx = -1;
618 info->status.rates[i].count = 0;
622 count += info->status.rates[i].count;
629 *retry_count = count;
633 void ieee80211_tx_status_noskb(struct ieee80211_hw *hw,
634 struct ieee80211_sta *pubsta,
635 struct ieee80211_tx_info *info)
637 struct ieee80211_local *local = hw_to_local(hw);
638 struct ieee80211_supported_band *sband;
640 bool acked, noack_success;
642 ieee80211_tx_get_rates(hw, info, &retry_count);
644 sband = hw->wiphy->bands[info->band];
646 acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
647 noack_success = !!(info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED);
650 struct sta_info *sta;
652 sta = container_of(pubsta, struct sta_info, sta);
655 sta->status_stats.retry_failed++;
656 sta->status_stats.retry_count += retry_count;
659 sta->status_stats.last_ack = jiffies;
661 if (sta->status_stats.lost_packets)
662 sta->status_stats.lost_packets = 0;
664 /* Track when last TDLS packet was ACKed */
665 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
666 sta->status_stats.last_tdls_pkt_time = jiffies;
668 ieee80211_lost_packet(sta, info);
671 rate_control_tx_status_noskb(local, sband, sta, info);
674 if (acked || noack_success) {
675 I802_DEBUG_INC(local->dot11TransmittedFrameCount);
677 I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
679 I802_DEBUG_INC(local->dot11RetryCount);
681 I802_DEBUG_INC(local->dot11MultipleRetryCount);
683 I802_DEBUG_INC(local->dot11FailedCount);
686 EXPORT_SYMBOL(ieee80211_tx_status_noskb);
688 void ieee80211_tx_monitor(struct ieee80211_local *local, struct sk_buff *skb,
689 struct ieee80211_supported_band *sband,
690 int retry_count, int shift, bool send_to_cooked)
692 struct sk_buff *skb2;
693 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
694 struct ieee80211_sub_if_data *sdata;
695 struct net_device *prev_dev = NULL;
698 /* send frame to monitor interfaces now */
699 rtap_len = ieee80211_tx_radiotap_len(info);
700 if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) {
701 pr_err("ieee80211_tx_status: headroom too small\n");
705 ieee80211_add_tx_radiotap_header(local, sband, skb, retry_count,
708 /* XXX: is this sufficient for BPF? */
709 skb_reset_mac_header(skb);
710 skb->ip_summed = CHECKSUM_UNNECESSARY;
711 skb->pkt_type = PACKET_OTHERHOST;
712 skb->protocol = htons(ETH_P_802_2);
713 memset(skb->cb, 0, sizeof(skb->cb));
716 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
717 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
718 if (!ieee80211_sdata_running(sdata))
721 if ((sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) &&
726 skb2 = skb_clone(skb, GFP_ATOMIC);
728 skb2->dev = prev_dev;
733 prev_dev = sdata->dev;
745 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
747 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
748 struct ieee80211_local *local = hw_to_local(hw);
749 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
751 struct ieee80211_supported_band *sband;
752 struct rhlist_head *tmp;
753 struct sta_info *sta;
758 struct ieee80211_bar *bar;
760 int tid = IEEE80211_NUM_TIDS;
762 rates_idx = ieee80211_tx_get_rates(hw, info, &retry_count);
766 sband = local->hw.wiphy->bands[info->band];
767 fc = hdr->frame_control;
769 for_each_sta_info(local, hdr->addr1, sta, tmp) {
770 /* skip wrong virtual interface */
771 if (!ether_addr_equal(hdr->addr2, sta->sdata->vif.addr))
774 shift = ieee80211_vif_get_shift(&sta->sdata->vif);
776 if (info->flags & IEEE80211_TX_STATUS_EOSP)
777 clear_sta_flag(sta, WLAN_STA_SP);
779 acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
781 /* mesh Peer Service Period support */
782 if (ieee80211_vif_is_mesh(&sta->sdata->vif) &&
783 ieee80211_is_data_qos(fc))
784 ieee80211_mpsp_trigger_process(
785 ieee80211_get_qos_ctl(hdr), sta, true, acked);
787 if (!acked && test_sta_flag(sta, WLAN_STA_PS_STA)) {
789 * The STA is in power save mode, so assume
790 * that this TX packet failed because of that.
792 ieee80211_handle_filtered_frame(local, sta, skb);
797 if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL) &&
798 (ieee80211_is_data(hdr->frame_control)) &&
800 sta->tx_stats.last_rate =
801 info->status.rates[rates_idx];
803 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
804 (ieee80211_is_data_qos(fc))) {
808 qc = ieee80211_get_qos_ctl(hdr);
810 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
811 & IEEE80211_SCTL_SEQ);
812 ieee80211_send_bar(&sta->sdata->vif, hdr->addr1,
814 } else if (ieee80211_is_data_qos(fc)) {
815 u8 *qc = ieee80211_get_qos_ctl(hdr);
820 if (!acked && ieee80211_is_back_req(fc)) {
824 * BAR failed, store the last SSN and retry sending
825 * the BAR when the next unicast transmission on the
828 bar = (struct ieee80211_bar *) skb->data;
829 control = le16_to_cpu(bar->control);
830 if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) {
831 u16 ssn = le16_to_cpu(bar->start_seq_num);
834 IEEE80211_BAR_CTRL_TID_INFO_MASK) >>
835 IEEE80211_BAR_CTRL_TID_INFO_SHIFT;
837 ieee80211_set_bar_pending(sta, tid, ssn);
841 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
842 ieee80211_handle_filtered_frame(local, sta, skb);
847 sta->status_stats.retry_failed++;
848 sta->status_stats.retry_count += retry_count;
850 if (ieee80211_is_data_present(fc)) {
852 sta->status_stats.msdu_failed[tid]++;
854 sta->status_stats.msdu_retries[tid] +=
859 rate_control_tx_status(local, sband, sta, skb);
860 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
861 ieee80211s_update_metric(local, sta, skb);
863 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked)
864 ieee80211_frame_acked(sta, skb);
866 if ((sta->sdata->vif.type == NL80211_IFTYPE_STATION) &&
867 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
868 ieee80211_sta_tx_notify(sta->sdata, (void *) skb->data,
869 acked, info->status.tx_time);
871 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
872 if (info->flags & IEEE80211_TX_STAT_ACK) {
873 if (sta->status_stats.lost_packets)
874 sta->status_stats.lost_packets = 0;
876 /* Track when last TDLS packet was ACKed */
877 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
878 sta->status_stats.last_tdls_pkt_time =
881 ieee80211_lost_packet(sta, info);
888 ieee80211_led_tx(local);
891 * Fragments are passed to low-level drivers as separate skbs, so these
892 * are actually fragments, not frames. Update frame counters only for
893 * the first fragment of the frame. */
894 if ((info->flags & IEEE80211_TX_STAT_ACK) ||
895 (info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED)) {
896 if (ieee80211_is_first_frag(hdr->seq_ctrl)) {
897 I802_DEBUG_INC(local->dot11TransmittedFrameCount);
898 if (is_multicast_ether_addr(ieee80211_get_DA(hdr)))
899 I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
901 I802_DEBUG_INC(local->dot11RetryCount);
903 I802_DEBUG_INC(local->dot11MultipleRetryCount);
906 /* This counter shall be incremented for an acknowledged MPDU
907 * with an individual address in the address 1 field or an MPDU
908 * with a multicast address in the address 1 field of type Data
910 if (!is_multicast_ether_addr(hdr->addr1) ||
911 ieee80211_is_data(fc) ||
912 ieee80211_is_mgmt(fc))
913 I802_DEBUG_INC(local->dot11TransmittedFragmentCount);
915 if (ieee80211_is_first_frag(hdr->seq_ctrl))
916 I802_DEBUG_INC(local->dot11FailedCount);
919 if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) &&
920 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
921 !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
922 local->ps_sdata && !(local->scanning)) {
923 if (info->flags & IEEE80211_TX_STAT_ACK) {
924 local->ps_sdata->u.mgd.flags |=
925 IEEE80211_STA_NULLFUNC_ACKED;
927 mod_timer(&local->dynamic_ps_timer, jiffies +
928 msecs_to_jiffies(10));
931 ieee80211_report_used_skb(local, skb, false);
933 /* this was a transmitted frame, but now we want to reuse it */
936 /* Need to make a copy before skb->cb gets cleared */
937 send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) ||
938 !(ieee80211_is_data(fc));
941 * This is a bit racy but we can avoid a lot of work
944 if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) {
949 /* send to monitor interfaces */
950 ieee80211_tx_monitor(local, skb, sband, retry_count, shift, send_to_cooked);
952 EXPORT_SYMBOL(ieee80211_tx_status);
954 void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets)
956 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
957 cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
958 num_packets, GFP_ATOMIC);
960 EXPORT_SYMBOL(ieee80211_report_low_ack);
962 void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb)
964 struct ieee80211_local *local = hw_to_local(hw);
966 ieee80211_report_used_skb(local, skb, true);
967 dev_kfree_skb_any(skb);
969 EXPORT_SYMBOL(ieee80211_free_txskb);
971 void ieee80211_purge_tx_queue(struct ieee80211_hw *hw,
972 struct sk_buff_head *skbs)
976 while ((skb = __skb_dequeue(skbs)))
977 ieee80211_free_txskb(hw, skb);