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_free_txskb(&local->hw, skb);
60 * This skb 'survived' a round-trip through the driver, and
61 * hopefully the driver didn't mangle it too badly. However,
62 * we can definitely not rely on the control information
63 * being correct. Clear it so we don't get junk there, and
64 * indicate that it needs new processing, but must not be
65 * modified/encrypted again.
67 memset(&info->control, 0, sizeof(info->control));
69 info->control.jiffies = jiffies;
70 info->control.vif = &sta->sdata->vif;
71 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING |
72 IEEE80211_TX_INTFL_RETRANSMISSION;
73 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
75 sta->status_stats.filtered++;
78 * Clear more-data bit on filtered frames, it might be set
79 * but later frames might time out so it might have to be
80 * clear again ... It's all rather unlikely (this frame
81 * should time out first, right?) but let's not confuse
82 * peers unnecessarily.
84 if (hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_MOREDATA))
85 hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_MOREDATA);
87 if (ieee80211_is_data_qos(hdr->frame_control)) {
88 u8 *p = ieee80211_get_qos_ctl(hdr);
89 int tid = *p & IEEE80211_QOS_CTL_TID_MASK;
92 * Clear EOSP if set, this could happen e.g.
93 * if an absence period (us being a P2P GO)
96 if (*p & IEEE80211_QOS_CTL_EOSP)
97 *p &= ~IEEE80211_QOS_CTL_EOSP;
98 ac = ieee80211_ac_from_tid(tid);
100 ac = IEEE80211_AC_BE;
104 * Clear the TX filter mask for this STA when sending the next
105 * packet. If the STA went to power save mode, this will happen
106 * when it wakes up for the next time.
108 set_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT);
109 ieee80211_clear_fast_xmit(sta);
112 * This code races in the following way:
114 * (1) STA sends frame indicating it will go to sleep and does so
115 * (2) hardware/firmware adds STA to filter list, passes frame up
116 * (3) hardware/firmware processes TX fifo and suppresses a frame
117 * (4) we get TX status before having processed the frame and
118 * knowing that the STA has gone to sleep.
120 * This is actually quite unlikely even when both those events are
121 * processed from interrupts coming in quickly after one another or
122 * even at the same time because we queue both TX status events and
123 * RX frames to be processed by a tasklet and process them in the
124 * same order that they were received or TX status last. Hence, there
125 * is no race as long as the frame RX is processed before the next TX
126 * status, which drivers can ensure, see below.
128 * Note that this can only happen if the hardware or firmware can
129 * actually add STAs to the filter list, if this is done by the
130 * driver in response to set_tim() (which will only reduce the race
131 * this whole filtering tries to solve, not completely solve it)
132 * this situation cannot happen.
134 * To completely solve this race drivers need to make sure that they
135 * (a) don't mix the irq-safe/not irq-safe TX status/RX processing
137 * (b) always process RX events before TX status events if ordering
138 * can be unknown, for example with different interrupt status
140 * (c) if PS mode transitions are manual (i.e. the flag
141 * %IEEE80211_HW_AP_LINK_PS is set), always process PS state
142 * changes before calling TX status events if ordering can be
145 if (test_sta_flag(sta, WLAN_STA_PS_STA) &&
146 skb_queue_len(&sta->tx_filtered[ac]) < STA_MAX_TX_BUFFER) {
147 skb_queue_tail(&sta->tx_filtered[ac], skb);
148 sta_info_recalc_tim(sta);
150 if (!timer_pending(&local->sta_cleanup))
151 mod_timer(&local->sta_cleanup,
152 round_jiffies(jiffies +
153 STA_INFO_CLEANUP_INTERVAL));
157 if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
158 !(info->flags & IEEE80211_TX_INTFL_RETRIED)) {
159 /* Software retry the packet once */
160 info->flags |= IEEE80211_TX_INTFL_RETRIED;
161 ieee80211_add_pending_skb(local, skb);
165 ps_dbg_ratelimited(sta->sdata,
166 "dropped TX filtered frame, queue_len=%d PS=%d @%lu\n",
167 skb_queue_len(&sta->tx_filtered[ac]),
168 !!test_sta_flag(sta, WLAN_STA_PS_STA), jiffies);
169 ieee80211_free_txskb(&local->hw, skb);
172 static void ieee80211_check_pending_bar(struct sta_info *sta, u8 *addr, u8 tid)
174 struct tid_ampdu_tx *tid_tx;
176 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
177 if (!tid_tx || !tid_tx->bar_pending)
180 tid_tx->bar_pending = false;
181 ieee80211_send_bar(&sta->sdata->vif, addr, tid, tid_tx->failed_bar_ssn);
184 static void ieee80211_frame_acked(struct sta_info *sta, struct sk_buff *skb)
186 struct ieee80211_mgmt *mgmt = (void *) skb->data;
187 struct ieee80211_local *local = sta->local;
188 struct ieee80211_sub_if_data *sdata = sta->sdata;
190 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
191 sta->status_stats.last_ack = jiffies;
193 if (ieee80211_is_data_qos(mgmt->frame_control)) {
194 struct ieee80211_hdr *hdr = (void *) skb->data;
195 u8 *qc = ieee80211_get_qos_ctl(hdr);
196 u16 tid = qc[0] & 0xf;
198 ieee80211_check_pending_bar(sta, hdr->addr1, tid);
201 if (ieee80211_is_action(mgmt->frame_control) &&
202 mgmt->u.action.category == WLAN_CATEGORY_HT &&
203 mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS &&
204 ieee80211_sdata_running(sdata)) {
205 enum ieee80211_smps_mode smps_mode;
207 switch (mgmt->u.action.u.ht_smps.smps_control) {
208 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
209 smps_mode = IEEE80211_SMPS_DYNAMIC;
211 case WLAN_HT_SMPS_CONTROL_STATIC:
212 smps_mode = IEEE80211_SMPS_STATIC;
214 case WLAN_HT_SMPS_CONTROL_DISABLED:
215 default: /* shouldn't happen since we don't send that */
216 smps_mode = IEEE80211_SMPS_OFF;
220 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
222 * This update looks racy, but isn't -- if we come
223 * here we've definitely got a station that we're
224 * talking to, and on a managed interface that can
225 * only be the AP. And the only other place updating
226 * this variable in managed mode is before association.
228 sdata->smps_mode = smps_mode;
229 ieee80211_queue_work(&local->hw, &sdata->recalc_smps);
230 } else if (sdata->vif.type == NL80211_IFTYPE_AP ||
231 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
232 sta->known_smps_mode = smps_mode;
237 static void ieee80211_set_bar_pending(struct sta_info *sta, u8 tid, u16 ssn)
239 struct tid_ampdu_tx *tid_tx;
241 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
245 tid_tx->failed_bar_ssn = ssn;
246 tid_tx->bar_pending = true;
249 static int ieee80211_tx_radiotap_len(struct ieee80211_tx_info *info)
251 int len = sizeof(struct ieee80211_radiotap_header);
253 /* IEEE80211_RADIOTAP_RATE rate */
254 if (info->status.rates[0].idx >= 0 &&
255 !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS |
256 IEEE80211_TX_RC_VHT_MCS)))
259 /* IEEE80211_RADIOTAP_TX_FLAGS */
262 /* IEEE80211_RADIOTAP_DATA_RETRIES */
265 /* IEEE80211_RADIOTAP_MCS
266 * IEEE80211_RADIOTAP_VHT */
267 if (info->status.rates[0].idx >= 0) {
268 if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS)
270 else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS)
271 len = ALIGN(len, 2) + 12;
278 ieee80211_add_tx_radiotap_header(struct ieee80211_local *local,
279 struct ieee80211_supported_band *sband,
280 struct sk_buff *skb, int retry_count,
281 int rtap_len, int shift)
283 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
284 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
285 struct ieee80211_radiotap_header *rthdr;
289 rthdr = (struct ieee80211_radiotap_header *) skb_push(skb, rtap_len);
291 memset(rthdr, 0, rtap_len);
292 rthdr->it_len = cpu_to_le16(rtap_len);
294 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
295 (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
296 pos = (unsigned char *)(rthdr + 1);
299 * XXX: Once radiotap gets the bitmap reset thing the vendor
300 * extensions proposal contains, we can actually report
301 * the whole set of tries we did.
304 /* IEEE80211_RADIOTAP_RATE */
305 if (info->status.rates[0].idx >= 0 &&
306 !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS |
307 IEEE80211_TX_RC_VHT_MCS))) {
310 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
311 rate = sband->bitrates[info->status.rates[0].idx].bitrate;
312 *pos = DIV_ROUND_UP(rate, 5 * (1 << shift));
313 /* padding for tx flags */
317 /* IEEE80211_RADIOTAP_TX_FLAGS */
319 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
320 !is_multicast_ether_addr(hdr->addr1))
321 txflags |= IEEE80211_RADIOTAP_F_TX_FAIL;
323 if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
324 txflags |= IEEE80211_RADIOTAP_F_TX_CTS;
325 if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
326 txflags |= IEEE80211_RADIOTAP_F_TX_RTS;
328 put_unaligned_le16(txflags, pos);
331 /* IEEE80211_RADIOTAP_DATA_RETRIES */
332 /* for now report the total retry_count */
336 if (info->status.rates[0].idx < 0)
339 /* IEEE80211_RADIOTAP_MCS
340 * IEEE80211_RADIOTAP_VHT */
341 if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS) {
342 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
343 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
344 IEEE80211_RADIOTAP_MCS_HAVE_GI |
345 IEEE80211_RADIOTAP_MCS_HAVE_BW;
346 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
347 pos[1] |= IEEE80211_RADIOTAP_MCS_SGI;
348 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
349 pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40;
350 if (info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)
351 pos[1] |= IEEE80211_RADIOTAP_MCS_FMT_GF;
352 pos[2] = info->status.rates[0].idx;
354 } else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS) {
355 u16 known = local->hw.radiotap_vht_details &
356 (IEEE80211_RADIOTAP_VHT_KNOWN_GI |
357 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH);
359 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT);
361 /* required alignment from rthdr */
362 pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2);
364 /* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */
365 put_unaligned_le16(known, pos);
368 /* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */
369 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
370 *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI;
374 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
376 else if (info->status.rates[0].flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
378 else if (info->status.rates[0].flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
380 else /* IEEE80211_TX_RC_{20_MHZ_WIDTH,FIXME:DUP_DATA} */
385 *pos = (ieee80211_rate_get_vht_mcs(&info->status.rates[0]) << 4) |
386 ieee80211_rate_get_vht_nss(&info->status.rates[0]);
393 /* u16 partial_aid */
399 * Handles the tx for TDLS teardown frames.
400 * If the frame wasn't ACKed by the peer - it will be re-sent through the AP
402 static void ieee80211_tdls_td_tx_handle(struct ieee80211_local *local,
403 struct ieee80211_sub_if_data *sdata,
404 struct sk_buff *skb, u32 flags)
406 struct sk_buff *teardown_skb;
407 struct sk_buff *orig_teardown_skb;
408 bool is_teardown = false;
410 /* Get the teardown data we need and free the lock */
411 spin_lock(&sdata->u.mgd.teardown_lock);
412 teardown_skb = sdata->u.mgd.teardown_skb;
413 orig_teardown_skb = sdata->u.mgd.orig_teardown_skb;
414 if ((skb == orig_teardown_skb) && teardown_skb) {
415 sdata->u.mgd.teardown_skb = NULL;
416 sdata->u.mgd.orig_teardown_skb = NULL;
419 spin_unlock(&sdata->u.mgd.teardown_lock);
422 /* This mechanism relies on being able to get ACKs */
423 WARN_ON(!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS));
425 /* Check if peer has ACKed */
426 if (flags & IEEE80211_TX_STAT_ACK) {
427 dev_kfree_skb_any(teardown_skb);
430 "TDLS Resending teardown through AP\n");
432 ieee80211_subif_start_xmit(teardown_skb, skb->dev);
437 static struct ieee80211_sub_if_data *
438 ieee80211_sdata_from_skb(struct ieee80211_local *local, struct sk_buff *skb)
440 struct ieee80211_sub_if_data *sdata;
443 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
447 if (skb->dev == sdata->dev)
454 return rcu_dereference(local->p2p_sdata);
457 static void ieee80211_report_ack_skb(struct ieee80211_local *local,
458 struct ieee80211_tx_info *info,
459 bool acked, bool dropped)
464 spin_lock_irqsave(&local->ack_status_lock, flags);
465 skb = idr_remove(&local->ack_status_frames, info->ack_frame_id);
466 spin_unlock_irqrestore(&local->ack_status_lock, flags);
472 dev_kfree_skb_any(skb);
476 if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX) {
477 u64 cookie = IEEE80211_SKB_CB(skb)->ack.cookie;
478 struct ieee80211_sub_if_data *sdata;
479 struct ieee80211_hdr *hdr = (void *)skb->data;
482 sdata = ieee80211_sdata_from_skb(local, skb);
484 if (ieee80211_is_nullfunc(hdr->frame_control) ||
485 ieee80211_is_qos_nullfunc(hdr->frame_control))
486 cfg80211_probe_status(sdata->dev, hdr->addr1,
490 cfg80211_mgmt_tx_status(&sdata->wdev, cookie,
496 dev_kfree_skb_any(skb);
499 skb_complete_wifi_ack(skb, acked);
503 static void ieee80211_report_used_skb(struct ieee80211_local *local,
504 struct sk_buff *skb, bool dropped)
506 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
507 struct ieee80211_hdr *hdr = (void *)skb->data;
508 bool acked = info->flags & IEEE80211_TX_STAT_ACK;
513 if (info->flags & IEEE80211_TX_INTFL_MLME_CONN_TX) {
514 struct ieee80211_sub_if_data *sdata;
518 sdata = ieee80211_sdata_from_skb(local, skb);
523 unsigned int hdr_size =
524 ieee80211_hdrlen(hdr->frame_control);
526 /* Check to see if packet is a TDLS teardown packet */
527 if (ieee80211_is_data(hdr->frame_control) &&
528 (ieee80211_get_tdls_action(skb, hdr_size) ==
530 ieee80211_tdls_td_tx_handle(local, sdata, skb,
533 ieee80211_mgd_conn_tx_status(sdata,
539 } else if (info->ack_frame_id) {
540 ieee80211_report_ack_skb(local, info, acked, dropped);
543 if (!dropped && skb->destructor) {
544 skb->wifi_acked_valid = 1;
545 skb->wifi_acked = acked;
550 * Use a static threshold for now, best value to be determined
552 * Should it depend on:
553 * - on # of retransmissions
554 * - current throughput (higher value for higher tpt)?
556 #define STA_LOST_PKT_THRESHOLD 50
557 #define STA_LOST_TDLS_PKT_THRESHOLD 10
558 #define STA_LOST_TDLS_PKT_TIME (10*HZ) /* 10secs since last ACK */
560 static void ieee80211_lost_packet(struct sta_info *sta,
561 struct ieee80211_tx_info *info)
563 /* If driver relies on its own algorithm for station kickout, skip
564 * mac80211 packet loss mechanism.
566 if (ieee80211_hw_check(&sta->local->hw, REPORTS_LOW_ACK))
569 /* This packet was aggregated but doesn't carry status info */
570 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
571 !(info->flags & IEEE80211_TX_STAT_AMPDU))
574 sta->status_stats.lost_packets++;
575 if (!sta->sta.tdls &&
576 sta->status_stats.lost_packets < STA_LOST_PKT_THRESHOLD)
580 * If we're in TDLS mode, make sure that all STA_LOST_TDLS_PKT_THRESHOLD
581 * of the last packets were lost, and that no ACK was received in the
582 * last STA_LOST_TDLS_PKT_TIME ms, before triggering the CQM packet-loss
586 (sta->status_stats.lost_packets < STA_LOST_TDLS_PKT_THRESHOLD ||
588 sta->status_stats.last_tdls_pkt_time +
589 STA_LOST_TDLS_PKT_TIME)))
592 cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
593 sta->status_stats.lost_packets, GFP_ATOMIC);
594 sta->status_stats.lost_packets = 0;
597 static int ieee80211_tx_get_rates(struct ieee80211_hw *hw,
598 struct ieee80211_tx_info *info,
605 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
606 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
607 !(info->flags & IEEE80211_TX_STAT_AMPDU)) {
608 /* just the first aggr frame carry status info */
609 info->status.rates[i].idx = -1;
610 info->status.rates[i].count = 0;
612 } else if (info->status.rates[i].idx < 0) {
614 } else if (i >= hw->max_report_rates) {
615 /* the HW cannot have attempted that rate */
616 info->status.rates[i].idx = -1;
617 info->status.rates[i].count = 0;
621 count += info->status.rates[i].count;
628 *retry_count = count;
632 void ieee80211_tx_status_noskb(struct ieee80211_hw *hw,
633 struct ieee80211_sta *pubsta,
634 struct ieee80211_tx_info *info)
636 struct ieee80211_local *local = hw_to_local(hw);
637 struct ieee80211_supported_band *sband;
639 bool acked, noack_success;
641 ieee80211_tx_get_rates(hw, info, &retry_count);
643 sband = hw->wiphy->bands[info->band];
645 acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
646 noack_success = !!(info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED);
649 struct sta_info *sta;
651 sta = container_of(pubsta, struct sta_info, sta);
654 sta->status_stats.retry_failed++;
655 sta->status_stats.retry_count += retry_count;
658 sta->status_stats.last_ack = jiffies;
660 if (sta->status_stats.lost_packets)
661 sta->status_stats.lost_packets = 0;
663 /* Track when last TDLS packet was ACKed */
664 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
665 sta->status_stats.last_tdls_pkt_time = jiffies;
667 ieee80211_lost_packet(sta, info);
670 rate_control_tx_status_noskb(local, sband, sta, info);
673 if (acked || noack_success) {
674 I802_DEBUG_INC(local->dot11TransmittedFrameCount);
676 I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
678 I802_DEBUG_INC(local->dot11RetryCount);
680 I802_DEBUG_INC(local->dot11MultipleRetryCount);
682 I802_DEBUG_INC(local->dot11FailedCount);
685 EXPORT_SYMBOL(ieee80211_tx_status_noskb);
687 void ieee80211_tx_monitor(struct ieee80211_local *local, struct sk_buff *skb,
688 struct ieee80211_supported_band *sband,
689 int retry_count, int shift, bool send_to_cooked)
691 struct sk_buff *skb2;
692 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
693 struct ieee80211_sub_if_data *sdata;
694 struct net_device *prev_dev = NULL;
697 /* send frame to monitor interfaces now */
698 rtap_len = ieee80211_tx_radiotap_len(info);
699 if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) {
700 pr_err("ieee80211_tx_status: headroom too small\n");
704 ieee80211_add_tx_radiotap_header(local, sband, skb, retry_count,
707 /* XXX: is this sufficient for BPF? */
708 skb_reset_mac_header(skb);
709 skb->ip_summed = CHECKSUM_UNNECESSARY;
710 skb->pkt_type = PACKET_OTHERHOST;
711 skb->protocol = htons(ETH_P_802_2);
712 memset(skb->cb, 0, sizeof(skb->cb));
715 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
716 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
717 if (!ieee80211_sdata_running(sdata))
720 if ((sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) &&
725 skb2 = skb_clone(skb, GFP_ATOMIC);
727 skb2->dev = prev_dev;
732 prev_dev = sdata->dev;
744 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
746 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
747 struct ieee80211_local *local = hw_to_local(hw);
748 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
750 struct ieee80211_supported_band *sband;
751 struct rhlist_head *tmp;
752 struct sta_info *sta;
757 struct ieee80211_bar *bar;
759 int tid = IEEE80211_NUM_TIDS;
761 rates_idx = ieee80211_tx_get_rates(hw, info, &retry_count);
765 sband = local->hw.wiphy->bands[info->band];
766 fc = hdr->frame_control;
768 for_each_sta_info(local, hdr->addr1, sta, tmp) {
769 /* skip wrong virtual interface */
770 if (!ether_addr_equal(hdr->addr2, sta->sdata->vif.addr))
773 shift = ieee80211_vif_get_shift(&sta->sdata->vif);
775 if (info->flags & IEEE80211_TX_STATUS_EOSP)
776 clear_sta_flag(sta, WLAN_STA_SP);
778 acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
780 /* mesh Peer Service Period support */
781 if (ieee80211_vif_is_mesh(&sta->sdata->vif) &&
782 ieee80211_is_data_qos(fc))
783 ieee80211_mpsp_trigger_process(
784 ieee80211_get_qos_ctl(hdr), sta, true, acked);
786 if (!acked && test_sta_flag(sta, WLAN_STA_PS_STA)) {
788 * The STA is in power save mode, so assume
789 * that this TX packet failed because of that.
791 ieee80211_handle_filtered_frame(local, sta, skb);
796 if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL) &&
797 (ieee80211_is_data(hdr->frame_control)) &&
799 sta->tx_stats.last_rate =
800 info->status.rates[rates_idx];
802 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
803 (ieee80211_is_data_qos(fc))) {
807 qc = ieee80211_get_qos_ctl(hdr);
809 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
810 & IEEE80211_SCTL_SEQ);
811 ieee80211_send_bar(&sta->sdata->vif, hdr->addr1,
813 } else if (ieee80211_is_data_qos(fc)) {
814 u8 *qc = ieee80211_get_qos_ctl(hdr);
819 if (!acked && ieee80211_is_back_req(fc)) {
823 * BAR failed, store the last SSN and retry sending
824 * the BAR when the next unicast transmission on the
827 bar = (struct ieee80211_bar *) skb->data;
828 control = le16_to_cpu(bar->control);
829 if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) {
830 u16 ssn = le16_to_cpu(bar->start_seq_num);
833 IEEE80211_BAR_CTRL_TID_INFO_MASK) >>
834 IEEE80211_BAR_CTRL_TID_INFO_SHIFT;
836 ieee80211_set_bar_pending(sta, tid, ssn);
840 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
841 ieee80211_handle_filtered_frame(local, sta, skb);
846 sta->status_stats.retry_failed++;
847 sta->status_stats.retry_count += retry_count;
849 if (ieee80211_is_data_present(fc)) {
851 sta->status_stats.msdu_failed[tid]++;
853 sta->status_stats.msdu_retries[tid] +=
858 rate_control_tx_status(local, sband, sta, skb);
859 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
860 ieee80211s_update_metric(local, sta, skb);
862 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked)
863 ieee80211_frame_acked(sta, skb);
865 if ((sta->sdata->vif.type == NL80211_IFTYPE_STATION) &&
866 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
867 ieee80211_sta_tx_notify(sta->sdata, (void *) skb->data,
868 acked, info->status.tx_time);
870 if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
871 if (info->flags & IEEE80211_TX_STAT_ACK) {
872 if (sta->status_stats.lost_packets)
873 sta->status_stats.lost_packets = 0;
875 /* Track when last TDLS packet was ACKed */
876 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
877 sta->status_stats.last_tdls_pkt_time =
880 ieee80211_lost_packet(sta, info);
887 ieee80211_led_tx(local);
890 * Fragments are passed to low-level drivers as separate skbs, so these
891 * are actually fragments, not frames. Update frame counters only for
892 * the first fragment of the frame. */
893 if ((info->flags & IEEE80211_TX_STAT_ACK) ||
894 (info->flags & IEEE80211_TX_STAT_NOACK_TRANSMITTED)) {
895 if (ieee80211_is_first_frag(hdr->seq_ctrl)) {
896 I802_DEBUG_INC(local->dot11TransmittedFrameCount);
897 if (is_multicast_ether_addr(ieee80211_get_DA(hdr)))
898 I802_DEBUG_INC(local->dot11MulticastTransmittedFrameCount);
900 I802_DEBUG_INC(local->dot11RetryCount);
902 I802_DEBUG_INC(local->dot11MultipleRetryCount);
905 /* This counter shall be incremented for an acknowledged MPDU
906 * with an individual address in the address 1 field or an MPDU
907 * with a multicast address in the address 1 field of type Data
909 if (!is_multicast_ether_addr(hdr->addr1) ||
910 ieee80211_is_data(fc) ||
911 ieee80211_is_mgmt(fc))
912 I802_DEBUG_INC(local->dot11TransmittedFragmentCount);
914 if (ieee80211_is_first_frag(hdr->seq_ctrl))
915 I802_DEBUG_INC(local->dot11FailedCount);
918 if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) &&
919 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
920 !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
921 local->ps_sdata && !(local->scanning)) {
922 if (info->flags & IEEE80211_TX_STAT_ACK) {
923 local->ps_sdata->u.mgd.flags |=
924 IEEE80211_STA_NULLFUNC_ACKED;
926 mod_timer(&local->dynamic_ps_timer, jiffies +
927 msecs_to_jiffies(10));
930 ieee80211_report_used_skb(local, skb, false);
932 /* this was a transmitted frame, but now we want to reuse it */
935 /* Need to make a copy before skb->cb gets cleared */
936 send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) ||
937 !(ieee80211_is_data(fc));
940 * This is a bit racy but we can avoid a lot of work
943 if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) {
948 /* send to monitor interfaces */
949 ieee80211_tx_monitor(local, skb, sband, retry_count, shift, send_to_cooked);
951 EXPORT_SYMBOL(ieee80211_tx_status);
953 void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets)
955 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
956 cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
957 num_packets, GFP_ATOMIC);
959 EXPORT_SYMBOL(ieee80211_report_low_ack);
961 void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb)
963 struct ieee80211_local *local = hw_to_local(hw);
965 ieee80211_report_used_skb(local, skb, true);
966 dev_kfree_skb_any(skb);
968 EXPORT_SYMBOL(ieee80211_free_txskb);
970 void ieee80211_purge_tx_queue(struct ieee80211_hw *hw,
971 struct sk_buff_head *skbs)
975 while ((skb = __skb_dequeue(skbs)))
976 ieee80211_free_txskb(hw, skb);