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Johannes Bergfe7a5d52009-11-18 18:42:47 +01001/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
Jouni Malinen026331c2010-02-15 12:53:10 +02005 * Copyright 2008-2010 Johannes Berg <johannes@sipsolutions.net>
Johannes Bergfe7a5d52009-11-18 18:42:47 +01006 *
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.
10 */
11
12#include <net/mac80211.h>
13#include "ieee80211_i.h"
14#include "rate.h"
15#include "mesh.h"
16#include "led.h"
17
18
19void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
20 struct sk_buff *skb)
21{
22 struct ieee80211_local *local = hw_to_local(hw);
23 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
24 int tmp;
25
26 skb->pkt_type = IEEE80211_TX_STATUS_MSG;
27 skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
28 &local->skb_queue : &local->skb_queue_unreliable, skb);
29 tmp = skb_queue_len(&local->skb_queue) +
30 skb_queue_len(&local->skb_queue_unreliable);
31 while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
32 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
33 dev_kfree_skb_irq(skb);
34 tmp--;
35 I802_DEBUG_INC(local->tx_status_drop);
36 }
37 tasklet_schedule(&local->tasklet);
38}
39EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
40
41static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
42 struct sta_info *sta,
43 struct sk_buff *skb)
44{
45 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
46
47 /*
Johannes Berg697e6a02010-01-17 01:47:56 +010048 * This skb 'survived' a round-trip through the driver, and
49 * hopefully the driver didn't mangle it too badly. However,
Walter Goldens77c20612010-05-18 04:44:54 -070050 * we can definitely not rely on the control information
Johannes Bergc6fcf6b2010-01-17 01:47:59 +010051 * being correct. Clear it so we don't get junk there, and
52 * indicate that it needs new processing, but must not be
53 * modified/encrypted again.
Johannes Berg697e6a02010-01-17 01:47:56 +010054 */
55 memset(&info->control, 0, sizeof(info->control));
Johannes Berg18c94902010-01-25 19:07:39 +010056
57 info->control.jiffies = jiffies;
58 info->control.vif = &sta->sdata->vif;
Johannes Bergc6fcf6b2010-01-17 01:47:59 +010059 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING |
60 IEEE80211_TX_INTFL_RETRANSMISSION;
Christian Lampartereb7d3062010-09-21 21:36:18 +020061 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
Johannes Berg697e6a02010-01-17 01:47:56 +010062
Johannes Bergfe7a5d52009-11-18 18:42:47 +010063 sta->tx_filtered_count++;
64
65 /*
66 * Clear the TX filter mask for this STA when sending the next
67 * packet. If the STA went to power save mode, this will happen
68 * when it wakes up for the next time.
69 */
70 set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
71
72 /*
73 * This code races in the following way:
74 *
75 * (1) STA sends frame indicating it will go to sleep and does so
76 * (2) hardware/firmware adds STA to filter list, passes frame up
77 * (3) hardware/firmware processes TX fifo and suppresses a frame
78 * (4) we get TX status before having processed the frame and
79 * knowing that the STA has gone to sleep.
80 *
81 * This is actually quite unlikely even when both those events are
82 * processed from interrupts coming in quickly after one another or
83 * even at the same time because we queue both TX status events and
84 * RX frames to be processed by a tasklet and process them in the
85 * same order that they were received or TX status last. Hence, there
86 * is no race as long as the frame RX is processed before the next TX
87 * status, which drivers can ensure, see below.
88 *
89 * Note that this can only happen if the hardware or firmware can
90 * actually add STAs to the filter list, if this is done by the
91 * driver in response to set_tim() (which will only reduce the race
92 * this whole filtering tries to solve, not completely solve it)
93 * this situation cannot happen.
94 *
95 * To completely solve this race drivers need to make sure that they
96 * (a) don't mix the irq-safe/not irq-safe TX status/RX processing
97 * functions and
98 * (b) always process RX events before TX status events if ordering
99 * can be unknown, for example with different interrupt status
100 * bits.
Arik Nemtsovd057e5a2011-01-31 22:29:13 +0200101 * (c) if PS mode transitions are manual (i.e. the flag
102 * %IEEE80211_HW_AP_LINK_PS is set), always process PS state
103 * changes before calling TX status events if ordering can be
104 * unknown.
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100105 */
106 if (test_sta_flags(sta, WLAN_STA_PS_STA) &&
107 skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
108 skb_queue_tail(&sta->tx_filtered, skb);
109 return;
110 }
111
112 if (!test_sta_flags(sta, WLAN_STA_PS_STA) &&
113 !(info->flags & IEEE80211_TX_INTFL_RETRIED)) {
114 /* Software retry the packet once */
115 info->flags |= IEEE80211_TX_INTFL_RETRIED;
116 ieee80211_add_pending_skb(local, skb);
117 return;
118 }
119
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100120#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
121 if (net_ratelimit())
Joe Perches0fb9a9e2010-08-20 16:25:38 -0700122 wiphy_debug(local->hw.wiphy,
123 "dropped TX filtered frame, queue_len=%d PS=%d @%lu\n",
124 skb_queue_len(&sta->tx_filtered),
125 !!test_sta_flags(sta, WLAN_STA_PS_STA), jiffies);
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100126#endif
127 dev_kfree_skb(skb);
128}
129
Johannes Berg0f782312009-12-01 13:37:02 +0100130static void ieee80211_frame_acked(struct sta_info *sta, struct sk_buff *skb)
131{
132 struct ieee80211_mgmt *mgmt = (void *) skb->data;
133 struct ieee80211_local *local = sta->local;
134 struct ieee80211_sub_if_data *sdata = sta->sdata;
135
136 if (ieee80211_is_action(mgmt->frame_control) &&
137 sdata->vif.type == NL80211_IFTYPE_STATION &&
138 mgmt->u.action.category == WLAN_CATEGORY_HT &&
139 mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS) {
140 /*
141 * This update looks racy, but isn't -- if we come
142 * here we've definitely got a station that we're
143 * talking to, and on a managed interface that can
144 * only be the AP. And the only other place updating
145 * this variable is before we're associated.
146 */
147 switch (mgmt->u.action.u.ht_smps.smps_control) {
148 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
149 sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_DYNAMIC;
150 break;
151 case WLAN_HT_SMPS_CONTROL_STATIC:
152 sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_STATIC;
153 break;
154 case WLAN_HT_SMPS_CONTROL_DISABLED:
155 default: /* shouldn't happen since we don't send that */
156 sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_OFF;
157 break;
158 }
159
160 ieee80211_queue_work(&local->hw, &local->recalc_smps);
161 }
162}
163
Johannes Berg99ba2a12010-11-24 08:10:06 +0100164/*
165 * Use a static threshold for now, best value to be determined
166 * by testing ...
167 * Should it depend on:
168 * - on # of retransmissions
169 * - current throughput (higher value for higher tpt)?
170 */
171#define STA_LOST_PKT_THRESHOLD 50
172
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100173void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
174{
175 struct sk_buff *skb2;
176 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
177 struct ieee80211_local *local = hw_to_local(hw);
178 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
179 u16 frag, type;
180 __le16 fc;
181 struct ieee80211_supported_band *sband;
182 struct ieee80211_tx_status_rtap_hdr *rthdr;
183 struct ieee80211_sub_if_data *sdata;
184 struct net_device *prev_dev = NULL;
Johannes Bergabe60632009-11-25 17:46:18 +0100185 struct sta_info *sta, *tmp;
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100186 int retry_count = -1, i;
Juuso Oikarinen0c869802010-04-22 10:27:48 +0300187 int rates_idx = -1;
Felix Fietkaueaf55532010-03-11 16:28:24 +0100188 bool send_to_cooked;
Felix Fietkau04ac3c02010-12-02 21:01:08 +0100189 bool acked;
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100190
191 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
Helmut Schaabe7974a2011-03-21 15:07:55 +0100192 if (info->status.rates[i].idx < 0) {
193 break;
194 } else if (i >= hw->max_report_rates) {
195 /* the HW cannot have attempted that rate */
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100196 info->status.rates[i].idx = -1;
197 info->status.rates[i].count = 0;
Helmut Schaabe7974a2011-03-21 15:07:55 +0100198 break;
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100199 }
200
201 retry_count += info->status.rates[i].count;
202 }
Helmut Schaabe7974a2011-03-21 15:07:55 +0100203 rates_idx = i - 1;
204
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100205 if (retry_count < 0)
206 retry_count = 0;
207
208 rcu_read_lock();
209
210 sband = local->hw.wiphy->bands[info->band];
Vivek Natarajan375177b2010-02-09 14:50:28 +0530211 fc = hdr->frame_control;
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100212
Johannes Bergabe60632009-11-25 17:46:18 +0100213 for_each_sta_info(local, hdr->addr1, sta, tmp) {
214 /* skip wrong virtual interface */
Johannes Berg47846c92009-11-25 17:46:19 +0100215 if (memcmp(hdr->addr2, sta->sdata->vif.addr, ETH_ALEN))
Johannes Bergabe60632009-11-25 17:46:18 +0100216 continue;
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100217
Felix Fietkau04ac3c02010-12-02 21:01:08 +0100218 acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
219 if (!acked && test_sta_flags(sta, WLAN_STA_PS_STA)) {
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100220 /*
221 * The STA is in power save mode, so assume
222 * that this TX packet failed because of that.
223 */
224 ieee80211_handle_filtered_frame(local, sta, skb);
225 rcu_read_unlock();
226 return;
227 }
228
Juuso Oikarinen0c869802010-04-22 10:27:48 +0300229 if ((local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) &&
230 (rates_idx != -1))
231 sta->last_tx_rate = info->status.rates[rates_idx];
232
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100233 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
234 (ieee80211_is_data_qos(fc))) {
235 u16 tid, ssn;
236 u8 *qc;
237
238 qc = ieee80211_get_qos_ctl(hdr);
239 tid = qc[0] & 0xf;
240 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
241 & IEEE80211_SCTL_SEQ);
242 ieee80211_send_bar(sta->sdata, hdr->addr1,
243 tid, ssn);
244 }
245
246 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
247 ieee80211_handle_filtered_frame(local, sta, skb);
248 rcu_read_unlock();
249 return;
250 } else {
Felix Fietkau04ac3c02010-12-02 21:01:08 +0100251 if (!acked)
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100252 sta->tx_retry_failed++;
253 sta->tx_retry_count += retry_count;
254 }
255
256 rate_control_tx_status(local, sband, sta, skb);
257 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
258 ieee80211s_update_metric(local, sta, skb);
Johannes Berg0f782312009-12-01 13:37:02 +0100259
Felix Fietkau04ac3c02010-12-02 21:01:08 +0100260 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked)
Johannes Berg0f782312009-12-01 13:37:02 +0100261 ieee80211_frame_acked(sta, skb);
Johannes Berg99ba2a12010-11-24 08:10:06 +0100262
Felix Fietkau04ac3c02010-12-02 21:01:08 +0100263 if ((sta->sdata->vif.type == NL80211_IFTYPE_STATION) &&
264 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
265 ieee80211_sta_tx_notify(sta->sdata, (void *) skb->data, acked);
266
Johannes Berg99ba2a12010-11-24 08:10:06 +0100267 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
268 if (info->flags & IEEE80211_TX_STAT_ACK) {
269 if (sta->lost_packets)
270 sta->lost_packets = 0;
271 } else if (++sta->lost_packets >= STA_LOST_PKT_THRESHOLD) {
272 cfg80211_cqm_pktloss_notify(sta->sdata->dev,
273 sta->sta.addr,
274 sta->lost_packets,
275 GFP_ATOMIC);
276 sta->lost_packets = 0;
277 }
278 }
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100279 }
280
281 rcu_read_unlock();
282
283 ieee80211_led_tx(local, 0);
284
285 /* SNMP counters
286 * Fragments are passed to low-level drivers as separate skbs, so these
287 * are actually fragments, not frames. Update frame counters only for
288 * the first fragment of the frame. */
289
290 frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
291 type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
292
293 if (info->flags & IEEE80211_TX_STAT_ACK) {
294 if (frag == 0) {
295 local->dot11TransmittedFrameCount++;
296 if (is_multicast_ether_addr(hdr->addr1))
297 local->dot11MulticastTransmittedFrameCount++;
298 if (retry_count > 0)
299 local->dot11RetryCount++;
300 if (retry_count > 1)
301 local->dot11MultipleRetryCount++;
302 }
303
304 /* This counter shall be incremented for an acknowledged MPDU
305 * with an individual address in the address 1 field or an MPDU
306 * with a multicast address in the address 1 field of type Data
307 * or Management. */
308 if (!is_multicast_ether_addr(hdr->addr1) ||
309 type == IEEE80211_FTYPE_DATA ||
310 type == IEEE80211_FTYPE_MGMT)
311 local->dot11TransmittedFragmentCount++;
312 } else {
313 if (frag == 0)
314 local->dot11FailedCount++;
315 }
316
Vivek Natarajan375177b2010-02-09 14:50:28 +0530317 if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) &&
318 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
319 !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
320 local->ps_sdata && !(local->scanning)) {
321 if (info->flags & IEEE80211_TX_STAT_ACK) {
322 local->ps_sdata->u.mgd.flags |=
323 IEEE80211_STA_NULLFUNC_ACKED;
Vivek Natarajan375177b2010-02-09 14:50:28 +0530324 } else
325 mod_timer(&local->dynamic_ps_timer, jiffies +
326 msecs_to_jiffies(10));
327 }
328
Johannes Bergf30221e2010-11-25 10:02:30 +0100329 if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX) {
330 struct ieee80211_work *wk;
Johannes Berg4334ec82011-02-02 16:58:06 +0100331 u64 cookie = (unsigned long)skb;
Johannes Bergf30221e2010-11-25 10:02:30 +0100332
333 rcu_read_lock();
334 list_for_each_entry_rcu(wk, &local->work_list, list) {
335 if (wk->type != IEEE80211_WORK_OFFCHANNEL_TX)
336 continue;
337 if (wk->offchan_tx.frame != skb)
338 continue;
339 wk->offchan_tx.frame = NULL;
340 break;
341 }
342 rcu_read_unlock();
Johannes Berg4334ec82011-02-02 16:58:06 +0100343 if (local->hw_roc_skb_for_status == skb) {
344 cookie = local->hw_roc_cookie ^ 2;
345 local->hw_roc_skb_for_status = NULL;
346 }
Johannes Berg5f16a432011-02-25 15:36:57 +0100347
348 if (cookie == local->hw_offchan_tx_cookie)
349 local->hw_offchan_tx_cookie = 0;
350
Johannes Berg2e161f72010-08-12 15:38:38 +0200351 cfg80211_mgmt_tx_status(
Johannes Berg4334ec82011-02-02 16:58:06 +0100352 skb->dev, cookie, skb->data, skb->len,
Jouni Malinen026331c2010-02-15 12:53:10 +0200353 !!(info->flags & IEEE80211_TX_STAT_ACK), GFP_ATOMIC);
Johannes Bergf30221e2010-11-25 10:02:30 +0100354 }
Jouni Malinen026331c2010-02-15 12:53:10 +0200355
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100356 /* this was a transmitted frame, but now we want to reuse it */
357 skb_orphan(skb);
358
Felix Fietkaueaf55532010-03-11 16:28:24 +0100359 /* Need to make a copy before skb->cb gets cleared */
360 send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) ||
361 (type != IEEE80211_FTYPE_DATA);
362
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100363 /*
364 * This is a bit racy but we can avoid a lot of work
365 * with this test...
366 */
Felix Fietkaueaf55532010-03-11 16:28:24 +0100367 if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) {
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100368 dev_kfree_skb(skb);
369 return;
370 }
371
372 /* send frame to monitor interfaces now */
373
374 if (skb_headroom(skb) < sizeof(*rthdr)) {
375 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
376 dev_kfree_skb(skb);
377 return;
378 }
379
380 rthdr = (struct ieee80211_tx_status_rtap_hdr *)
381 skb_push(skb, sizeof(*rthdr));
382
383 memset(rthdr, 0, sizeof(*rthdr));
384 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
385 rthdr->hdr.it_present =
386 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
387 (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
388 (1 << IEEE80211_RADIOTAP_RATE));
389
390 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
391 !is_multicast_ether_addr(hdr->addr1))
392 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
393
394 /*
395 * XXX: Once radiotap gets the bitmap reset thing the vendor
396 * extensions proposal contains, we can actually report
397 * the whole set of tries we did.
398 */
399 if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
400 (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
401 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
402 else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
403 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
404 if (info->status.rates[0].idx >= 0 &&
405 !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
406 rthdr->rate = sband->bitrates[
407 info->status.rates[0].idx].bitrate / 5;
408
409 /* for now report the total retry_count */
410 rthdr->data_retries = retry_count;
411
412 /* XXX: is this sufficient for BPF? */
413 skb_set_mac_header(skb, 0);
414 skb->ip_summed = CHECKSUM_UNNECESSARY;
415 skb->pkt_type = PACKET_OTHERHOST;
416 skb->protocol = htons(ETH_P_802_2);
417 memset(skb->cb, 0, sizeof(skb->cb));
418
419 rcu_read_lock();
420 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
421 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
Johannes Berg9607e6b2009-12-23 13:15:31 +0100422 if (!ieee80211_sdata_running(sdata))
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100423 continue;
424
425 if ((sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) &&
Felix Fietkaueaf55532010-03-11 16:28:24 +0100426 !send_to_cooked)
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100427 continue;
428
429 if (prev_dev) {
430 skb2 = skb_clone(skb, GFP_ATOMIC);
431 if (skb2) {
432 skb2->dev = prev_dev;
John W. Linville4efe7f52010-10-07 11:35:40 -0400433 netif_rx(skb2);
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100434 }
435 }
436
437 prev_dev = sdata->dev;
438 }
439 }
440 if (prev_dev) {
441 skb->dev = prev_dev;
John W. Linville4efe7f52010-10-07 11:35:40 -0400442 netif_rx(skb);
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100443 skb = NULL;
444 }
445 rcu_read_unlock();
446 dev_kfree_skb(skb);
447}
448EXPORT_SYMBOL(ieee80211_tx_status);
Arik Nemtsov8178d382011-04-18 14:22:28 +0300449
450void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets)
451{
452 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
453 cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
454 num_packets, GFP_ATOMIC);
455}
456EXPORT_SYMBOL(ieee80211_report_low_ack);