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>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 #include <linux/export.h>
13 #include <net/mac80211.h>
14 #include "ieee80211_i.h"
21 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
24 struct ieee80211_local *local = hw_to_local(hw);
25 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
28 skb->pkt_type = IEEE80211_TX_STATUS_MSG;
29 skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
30 &local->skb_queue : &local->skb_queue_unreliable, skb);
31 tmp = skb_queue_len(&local->skb_queue) +
32 skb_queue_len(&local->skb_queue_unreliable);
33 while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
34 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
35 dev_kfree_skb_irq(skb);
37 I802_DEBUG_INC(local->tx_status_drop);
39 tasklet_schedule(&local->tasklet);
41 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
43 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
47 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
48 struct ieee80211_hdr *hdr = (void *)skb->data;
52 * This skb 'survived' a round-trip through the driver, and
53 * hopefully the driver didn't mangle it too badly. However,
54 * we can definitely not rely on the control information
55 * being correct. Clear it so we don't get junk there, and
56 * indicate that it needs new processing, but must not be
57 * modified/encrypted again.
59 memset(&info->control, 0, sizeof(info->control));
61 info->control.jiffies = jiffies;
62 info->control.vif = &sta->sdata->vif;
63 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING |
64 IEEE80211_TX_INTFL_RETRANSMISSION;
65 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
67 sta->tx_filtered_count++;
70 * Clear more-data bit on filtered frames, it might be set
71 * but later frames might time out so it might have to be
72 * clear again ... It's all rather unlikely (this frame
73 * should time out first, right?) but let's not confuse
74 * peers unnecessarily.
76 if (hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_MOREDATA))
77 hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_MOREDATA);
79 if (ieee80211_is_data_qos(hdr->frame_control)) {
80 u8 *p = ieee80211_get_qos_ctl(hdr);
81 int tid = *p & IEEE80211_QOS_CTL_TID_MASK;
84 * Clear EOSP if set, this could happen e.g.
85 * if an absence period (us being a P2P GO)
88 if (*p & IEEE80211_QOS_CTL_EOSP)
89 *p &= ~IEEE80211_QOS_CTL_EOSP;
90 ac = ieee802_1d_to_ac[tid & 7];
96 * Clear the TX filter mask for this STA when sending the next
97 * packet. If the STA went to power save mode, this will happen
98 * when it wakes up for the next time.
100 set_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT);
103 * This code races in the following way:
105 * (1) STA sends frame indicating it will go to sleep and does so
106 * (2) hardware/firmware adds STA to filter list, passes frame up
107 * (3) hardware/firmware processes TX fifo and suppresses a frame
108 * (4) we get TX status before having processed the frame and
109 * knowing that the STA has gone to sleep.
111 * This is actually quite unlikely even when both those events are
112 * processed from interrupts coming in quickly after one another or
113 * even at the same time because we queue both TX status events and
114 * RX frames to be processed by a tasklet and process them in the
115 * same order that they were received or TX status last. Hence, there
116 * is no race as long as the frame RX is processed before the next TX
117 * status, which drivers can ensure, see below.
119 * Note that this can only happen if the hardware or firmware can
120 * actually add STAs to the filter list, if this is done by the
121 * driver in response to set_tim() (which will only reduce the race
122 * this whole filtering tries to solve, not completely solve it)
123 * this situation cannot happen.
125 * To completely solve this race drivers need to make sure that they
126 * (a) don't mix the irq-safe/not irq-safe TX status/RX processing
128 * (b) always process RX events before TX status events if ordering
129 * can be unknown, for example with different interrupt status
131 * (c) if PS mode transitions are manual (i.e. the flag
132 * %IEEE80211_HW_AP_LINK_PS is set), always process PS state
133 * changes before calling TX status events if ordering can be
136 if (test_sta_flag(sta, WLAN_STA_PS_STA) &&
137 skb_queue_len(&sta->tx_filtered[ac]) < STA_MAX_TX_BUFFER) {
138 skb_queue_tail(&sta->tx_filtered[ac], skb);
139 sta_info_recalc_tim(sta);
141 if (!timer_pending(&local->sta_cleanup))
142 mod_timer(&local->sta_cleanup,
143 round_jiffies(jiffies +
144 STA_INFO_CLEANUP_INTERVAL));
148 if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
149 !(info->flags & IEEE80211_TX_INTFL_RETRIED)) {
150 /* Software retry the packet once */
151 info->flags |= IEEE80211_TX_INTFL_RETRIED;
152 ieee80211_add_pending_skb(local, skb);
156 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
158 wiphy_debug(local->hw.wiphy,
159 "dropped TX filtered frame, queue_len=%d PS=%d @%lu\n",
160 skb_queue_len(&sta->tx_filtered[ac]),
161 !!test_sta_flag(sta, WLAN_STA_PS_STA), jiffies);
166 static void ieee80211_check_pending_bar(struct sta_info *sta, u8 *addr, u8 tid)
168 struct tid_ampdu_tx *tid_tx;
170 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
171 if (!tid_tx || !tid_tx->bar_pending)
174 tid_tx->bar_pending = false;
175 ieee80211_send_bar(&sta->sdata->vif, addr, tid, tid_tx->failed_bar_ssn);
178 static void ieee80211_frame_acked(struct sta_info *sta, struct sk_buff *skb)
180 struct ieee80211_mgmt *mgmt = (void *) skb->data;
181 struct ieee80211_local *local = sta->local;
182 struct ieee80211_sub_if_data *sdata = sta->sdata;
184 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
185 sta->last_rx = jiffies;
187 if (ieee80211_is_data_qos(mgmt->frame_control)) {
188 struct ieee80211_hdr *hdr = (void *) skb->data;
189 u8 *qc = ieee80211_get_qos_ctl(hdr);
190 u16 tid = qc[0] & 0xf;
192 ieee80211_check_pending_bar(sta, hdr->addr1, tid);
195 if (ieee80211_is_action(mgmt->frame_control) &&
196 sdata->vif.type == NL80211_IFTYPE_STATION &&
197 mgmt->u.action.category == WLAN_CATEGORY_HT &&
198 mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS) {
200 * This update looks racy, but isn't -- if we come
201 * here we've definitely got a station that we're
202 * talking to, and on a managed interface that can
203 * only be the AP. And the only other place updating
204 * this variable is before we're associated.
206 switch (mgmt->u.action.u.ht_smps.smps_control) {
207 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
208 sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_DYNAMIC;
210 case WLAN_HT_SMPS_CONTROL_STATIC:
211 sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_STATIC;
213 case WLAN_HT_SMPS_CONTROL_DISABLED:
214 default: /* shouldn't happen since we don't send that */
215 sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_OFF;
219 ieee80211_queue_work(&local->hw, &local->recalc_smps);
223 static void ieee80211_set_bar_pending(struct sta_info *sta, u8 tid, u16 ssn)
225 struct tid_ampdu_tx *tid_tx;
227 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
231 tid_tx->failed_bar_ssn = ssn;
232 tid_tx->bar_pending = true;
235 static int ieee80211_tx_radiotap_len(struct ieee80211_tx_info *info)
237 int len = sizeof(struct ieee80211_radiotap_header);
239 /* IEEE80211_RADIOTAP_RATE rate */
240 if (info->status.rates[0].idx >= 0 &&
241 !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
244 /* IEEE80211_RADIOTAP_TX_FLAGS */
247 /* IEEE80211_RADIOTAP_DATA_RETRIES */
250 /* IEEE80211_TX_RC_MCS */
251 if (info->status.rates[0].idx >= 0 &&
252 info->status.rates[0].flags & IEEE80211_TX_RC_MCS)
258 static void ieee80211_add_tx_radiotap_header(struct ieee80211_supported_band
259 *sband, struct sk_buff *skb,
260 int retry_count, int rtap_len)
262 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
263 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
264 struct ieee80211_radiotap_header *rthdr;
268 rthdr = (struct ieee80211_radiotap_header *) skb_push(skb, rtap_len);
270 memset(rthdr, 0, rtap_len);
271 rthdr->it_len = cpu_to_le16(rtap_len);
273 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
274 (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
275 pos = (unsigned char *)(rthdr + 1);
278 * XXX: Once radiotap gets the bitmap reset thing the vendor
279 * extensions proposal contains, we can actually report
280 * the whole set of tries we did.
283 /* IEEE80211_RADIOTAP_RATE */
284 if (info->status.rates[0].idx >= 0 &&
285 !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS)) {
286 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
287 *pos = sband->bitrates[info->status.rates[0].idx].bitrate / 5;
288 /* padding for tx flags */
292 /* IEEE80211_RADIOTAP_TX_FLAGS */
294 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
295 !is_multicast_ether_addr(hdr->addr1))
296 txflags |= IEEE80211_RADIOTAP_F_TX_FAIL;
298 if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
299 (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
300 txflags |= IEEE80211_RADIOTAP_F_TX_CTS;
301 else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
302 txflags |= IEEE80211_RADIOTAP_F_TX_RTS;
304 put_unaligned_le16(txflags, pos);
307 /* IEEE80211_RADIOTAP_DATA_RETRIES */
308 /* for now report the total retry_count */
312 /* IEEE80211_TX_RC_MCS */
313 if (info->status.rates[0].idx >= 0 &&
314 info->status.rates[0].flags & IEEE80211_TX_RC_MCS) {
315 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
316 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
317 IEEE80211_RADIOTAP_MCS_HAVE_GI |
318 IEEE80211_RADIOTAP_MCS_HAVE_BW;
319 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
320 pos[1] |= IEEE80211_RADIOTAP_MCS_SGI;
321 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
322 pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40;
323 if (info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)
324 pos[1] |= IEEE80211_RADIOTAP_MCS_FMT_GF;
325 pos[2] = info->status.rates[0].idx;
332 * Use a static threshold for now, best value to be determined
334 * Should it depend on:
335 * - on # of retransmissions
336 * - current throughput (higher value for higher tpt)?
338 #define STA_LOST_PKT_THRESHOLD 50
340 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
342 struct sk_buff *skb2;
343 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
344 struct ieee80211_local *local = hw_to_local(hw);
345 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
348 struct ieee80211_supported_band *sband;
349 struct ieee80211_sub_if_data *sdata;
350 struct net_device *prev_dev = NULL;
351 struct sta_info *sta, *tmp;
352 int retry_count = -1, i;
356 struct ieee80211_bar *bar;
360 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
361 if (info->status.rates[i].idx < 0) {
363 } else if (i >= hw->max_report_rates) {
364 /* the HW cannot have attempted that rate */
365 info->status.rates[i].idx = -1;
366 info->status.rates[i].count = 0;
370 retry_count += info->status.rates[i].count;
379 sband = local->hw.wiphy->bands[info->band];
380 fc = hdr->frame_control;
382 for_each_sta_info(local, hdr->addr1, sta, tmp) {
383 /* skip wrong virtual interface */
384 if (memcmp(hdr->addr2, sta->sdata->vif.addr, ETH_ALEN))
387 if (info->flags & IEEE80211_TX_STATUS_EOSP)
388 clear_sta_flag(sta, WLAN_STA_SP);
390 acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
391 if (!acked && test_sta_flag(sta, WLAN_STA_PS_STA)) {
393 * The STA is in power save mode, so assume
394 * that this TX packet failed because of that.
396 ieee80211_handle_filtered_frame(local, sta, skb);
401 if ((local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) &&
403 sta->last_tx_rate = info->status.rates[rates_idx];
405 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
406 (ieee80211_is_data_qos(fc))) {
410 qc = ieee80211_get_qos_ctl(hdr);
412 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
413 & IEEE80211_SCTL_SEQ);
414 ieee80211_send_bar(&sta->sdata->vif, hdr->addr1,
418 if (!acked && ieee80211_is_back_req(fc)) {
422 * BAR failed, store the last SSN and retry sending
423 * the BAR when the next unicast transmission on the
426 bar = (struct ieee80211_bar *) skb->data;
427 control = le16_to_cpu(bar->control);
428 if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) {
429 u16 ssn = le16_to_cpu(bar->start_seq_num);
432 IEEE80211_BAR_CTRL_TID_INFO_MASK) >>
433 IEEE80211_BAR_CTRL_TID_INFO_SHIFT;
435 if (local->hw.flags &
436 IEEE80211_HW_TEARDOWN_AGGR_ON_BAR_FAIL)
437 ieee80211_stop_tx_ba_session(&sta->sta, tid);
439 ieee80211_set_bar_pending(sta, tid, ssn);
443 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
444 ieee80211_handle_filtered_frame(local, sta, skb);
449 sta->tx_retry_failed++;
450 sta->tx_retry_count += retry_count;
453 rate_control_tx_status(local, sband, sta, skb);
454 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
455 ieee80211s_update_metric(local, sta, skb);
457 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked)
458 ieee80211_frame_acked(sta, skb);
460 if ((sta->sdata->vif.type == NL80211_IFTYPE_STATION) &&
461 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
462 ieee80211_sta_tx_notify(sta->sdata, (void *) skb->data, acked);
464 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
465 if (info->flags & IEEE80211_TX_STAT_ACK) {
466 if (sta->lost_packets)
467 sta->lost_packets = 0;
468 } else if (++sta->lost_packets >= STA_LOST_PKT_THRESHOLD) {
469 cfg80211_cqm_pktloss_notify(sta->sdata->dev,
473 sta->lost_packets = 0;
480 ieee80211_led_tx(local, 0);
483 * Fragments are passed to low-level drivers as separate skbs, so these
484 * are actually fragments, not frames. Update frame counters only for
485 * the first fragment of the frame. */
487 frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
488 type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
490 if (info->flags & IEEE80211_TX_STAT_ACK) {
492 local->dot11TransmittedFrameCount++;
493 if (is_multicast_ether_addr(hdr->addr1))
494 local->dot11MulticastTransmittedFrameCount++;
496 local->dot11RetryCount++;
498 local->dot11MultipleRetryCount++;
501 /* This counter shall be incremented for an acknowledged MPDU
502 * with an individual address in the address 1 field or an MPDU
503 * with a multicast address in the address 1 field of type Data
505 if (!is_multicast_ether_addr(hdr->addr1) ||
506 type == IEEE80211_FTYPE_DATA ||
507 type == IEEE80211_FTYPE_MGMT)
508 local->dot11TransmittedFragmentCount++;
511 local->dot11FailedCount++;
514 if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) &&
515 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
516 !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
517 local->ps_sdata && !(local->scanning)) {
518 if (info->flags & IEEE80211_TX_STAT_ACK) {
519 local->ps_sdata->u.mgd.flags |=
520 IEEE80211_STA_NULLFUNC_ACKED;
522 mod_timer(&local->dynamic_ps_timer, jiffies +
523 msecs_to_jiffies(10));
526 if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX) {
527 struct ieee80211_work *wk;
528 u64 cookie = (unsigned long)skb;
531 list_for_each_entry_rcu(wk, &local->work_list, list) {
532 if (wk->type != IEEE80211_WORK_OFFCHANNEL_TX)
534 if (wk->offchan_tx.frame != skb)
536 wk->offchan_tx.status = true;
540 if (local->hw_roc_skb_for_status == skb) {
541 cookie = local->hw_roc_cookie ^ 2;
542 local->hw_roc_skb_for_status = NULL;
545 cfg80211_mgmt_tx_status(
546 skb->dev, cookie, skb->data, skb->len,
547 !!(info->flags & IEEE80211_TX_STAT_ACK), GFP_ATOMIC);
550 /* this was a transmitted frame, but now we want to reuse it */
553 /* Need to make a copy before skb->cb gets cleared */
554 send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) ||
555 (type != IEEE80211_FTYPE_DATA);
558 * This is a bit racy but we can avoid a lot of work
561 if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) {
566 /* send frame to monitor interfaces now */
567 rtap_len = ieee80211_tx_radiotap_len(info);
568 if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) {
569 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
573 ieee80211_add_tx_radiotap_header(sband, skb, retry_count, rtap_len);
575 /* XXX: is this sufficient for BPF? */
576 skb_set_mac_header(skb, 0);
577 skb->ip_summed = CHECKSUM_UNNECESSARY;
578 skb->pkt_type = PACKET_OTHERHOST;
579 skb->protocol = htons(ETH_P_802_2);
580 memset(skb->cb, 0, sizeof(skb->cb));
583 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
584 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
585 if (!ieee80211_sdata_running(sdata))
588 if ((sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) &&
593 skb2 = skb_clone(skb, GFP_ATOMIC);
595 skb2->dev = prev_dev;
600 prev_dev = sdata->dev;
611 EXPORT_SYMBOL(ieee80211_tx_status);
613 void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets)
615 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
616 cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
617 num_packets, GFP_ATOMIC);
619 EXPORT_SYMBOL(ieee80211_report_low_ack);