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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.
101 */
102 if (test_sta_flags(sta, WLAN_STA_PS_STA) &&
103 skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
104 skb_queue_tail(&sta->tx_filtered, skb);
105 return;
106 }
107
108 if (!test_sta_flags(sta, WLAN_STA_PS_STA) &&
109 !(info->flags & IEEE80211_TX_INTFL_RETRIED)) {
110 /* Software retry the packet once */
111 info->flags |= IEEE80211_TX_INTFL_RETRIED;
112 ieee80211_add_pending_skb(local, skb);
113 return;
114 }
115
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100116#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
117 if (net_ratelimit())
Joe Perches0fb9a9e2010-08-20 16:25:38 -0700118 wiphy_debug(local->hw.wiphy,
119 "dropped TX filtered frame, queue_len=%d PS=%d @%lu\n",
120 skb_queue_len(&sta->tx_filtered),
121 !!test_sta_flags(sta, WLAN_STA_PS_STA), jiffies);
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100122#endif
123 dev_kfree_skb(skb);
124}
125
Johannes Berg0f782312009-12-01 13:37:02 +0100126static void ieee80211_frame_acked(struct sta_info *sta, struct sk_buff *skb)
127{
128 struct ieee80211_mgmt *mgmt = (void *) skb->data;
129 struct ieee80211_local *local = sta->local;
130 struct ieee80211_sub_if_data *sdata = sta->sdata;
131
132 if (ieee80211_is_action(mgmt->frame_control) &&
133 sdata->vif.type == NL80211_IFTYPE_STATION &&
134 mgmt->u.action.category == WLAN_CATEGORY_HT &&
135 mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS) {
136 /*
137 * This update looks racy, but isn't -- if we come
138 * here we've definitely got a station that we're
139 * talking to, and on a managed interface that can
140 * only be the AP. And the only other place updating
141 * this variable is before we're associated.
142 */
143 switch (mgmt->u.action.u.ht_smps.smps_control) {
144 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
145 sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_DYNAMIC;
146 break;
147 case WLAN_HT_SMPS_CONTROL_STATIC:
148 sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_STATIC;
149 break;
150 case WLAN_HT_SMPS_CONTROL_DISABLED:
151 default: /* shouldn't happen since we don't send that */
152 sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_OFF;
153 break;
154 }
155
156 ieee80211_queue_work(&local->hw, &local->recalc_smps);
157 }
158}
159
Johannes Berg99ba2a12010-11-24 08:10:06 +0100160/*
161 * Use a static threshold for now, best value to be determined
162 * by testing ...
163 * Should it depend on:
164 * - on # of retransmissions
165 * - current throughput (higher value for higher tpt)?
166 */
167#define STA_LOST_PKT_THRESHOLD 50
168
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100169void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
170{
171 struct sk_buff *skb2;
172 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
173 struct ieee80211_local *local = hw_to_local(hw);
174 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
175 u16 frag, type;
176 __le16 fc;
177 struct ieee80211_supported_band *sband;
178 struct ieee80211_tx_status_rtap_hdr *rthdr;
179 struct ieee80211_sub_if_data *sdata;
180 struct net_device *prev_dev = NULL;
Johannes Bergabe60632009-11-25 17:46:18 +0100181 struct sta_info *sta, *tmp;
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100182 int retry_count = -1, i;
Juuso Oikarinen0c869802010-04-22 10:27:48 +0300183 int rates_idx = -1;
Felix Fietkaueaf55532010-03-11 16:28:24 +0100184 bool send_to_cooked;
Felix Fietkau04ac3c02010-12-02 21:01:08 +0100185 bool acked;
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100186
187 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
188 /* the HW cannot have attempted that rate */
Helmut Schaa78be49e2010-10-02 11:31:55 +0200189 if (i >= hw->max_report_rates) {
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100190 info->status.rates[i].idx = -1;
191 info->status.rates[i].count = 0;
Juuso Oikarinen0c869802010-04-22 10:27:48 +0300192 } else if (info->status.rates[i].idx >= 0) {
193 rates_idx = i;
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100194 }
195
196 retry_count += info->status.rates[i].count;
197 }
198 if (retry_count < 0)
199 retry_count = 0;
200
201 rcu_read_lock();
202
203 sband = local->hw.wiphy->bands[info->band];
Vivek Natarajan375177b2010-02-09 14:50:28 +0530204 fc = hdr->frame_control;
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100205
Johannes Bergabe60632009-11-25 17:46:18 +0100206 for_each_sta_info(local, hdr->addr1, sta, tmp) {
207 /* skip wrong virtual interface */
Johannes Berg47846c92009-11-25 17:46:19 +0100208 if (memcmp(hdr->addr2, sta->sdata->vif.addr, ETH_ALEN))
Johannes Bergabe60632009-11-25 17:46:18 +0100209 continue;
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100210
Felix Fietkau04ac3c02010-12-02 21:01:08 +0100211 acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
212 if (!acked && test_sta_flags(sta, WLAN_STA_PS_STA)) {
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100213 /*
214 * The STA is in power save mode, so assume
215 * that this TX packet failed because of that.
216 */
217 ieee80211_handle_filtered_frame(local, sta, skb);
218 rcu_read_unlock();
219 return;
220 }
221
Juuso Oikarinen0c869802010-04-22 10:27:48 +0300222 if ((local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) &&
223 (rates_idx != -1))
224 sta->last_tx_rate = info->status.rates[rates_idx];
225
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100226 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
227 (ieee80211_is_data_qos(fc))) {
228 u16 tid, ssn;
229 u8 *qc;
230
231 qc = ieee80211_get_qos_ctl(hdr);
232 tid = qc[0] & 0xf;
233 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
234 & IEEE80211_SCTL_SEQ);
235 ieee80211_send_bar(sta->sdata, hdr->addr1,
236 tid, ssn);
237 }
238
239 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
240 ieee80211_handle_filtered_frame(local, sta, skb);
241 rcu_read_unlock();
242 return;
243 } else {
Felix Fietkau04ac3c02010-12-02 21:01:08 +0100244 if (!acked)
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100245 sta->tx_retry_failed++;
246 sta->tx_retry_count += retry_count;
247 }
248
249 rate_control_tx_status(local, sband, sta, skb);
250 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
251 ieee80211s_update_metric(local, sta, skb);
Johannes Berg0f782312009-12-01 13:37:02 +0100252
Felix Fietkau04ac3c02010-12-02 21:01:08 +0100253 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked)
Johannes Berg0f782312009-12-01 13:37:02 +0100254 ieee80211_frame_acked(sta, skb);
Johannes Berg99ba2a12010-11-24 08:10:06 +0100255
Felix Fietkau04ac3c02010-12-02 21:01:08 +0100256 if ((sta->sdata->vif.type == NL80211_IFTYPE_STATION) &&
257 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
258 ieee80211_sta_tx_notify(sta->sdata, (void *) skb->data, acked);
259
Johannes Berg99ba2a12010-11-24 08:10:06 +0100260 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
261 if (info->flags & IEEE80211_TX_STAT_ACK) {
262 if (sta->lost_packets)
263 sta->lost_packets = 0;
264 } else if (++sta->lost_packets >= STA_LOST_PKT_THRESHOLD) {
265 cfg80211_cqm_pktloss_notify(sta->sdata->dev,
266 sta->sta.addr,
267 sta->lost_packets,
268 GFP_ATOMIC);
269 sta->lost_packets = 0;
270 }
271 }
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100272 }
273
274 rcu_read_unlock();
275
276 ieee80211_led_tx(local, 0);
277
278 /* SNMP counters
279 * Fragments are passed to low-level drivers as separate skbs, so these
280 * are actually fragments, not frames. Update frame counters only for
281 * the first fragment of the frame. */
282
283 frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
284 type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
285
286 if (info->flags & IEEE80211_TX_STAT_ACK) {
287 if (frag == 0) {
288 local->dot11TransmittedFrameCount++;
289 if (is_multicast_ether_addr(hdr->addr1))
290 local->dot11MulticastTransmittedFrameCount++;
291 if (retry_count > 0)
292 local->dot11RetryCount++;
293 if (retry_count > 1)
294 local->dot11MultipleRetryCount++;
295 }
296
297 /* This counter shall be incremented for an acknowledged MPDU
298 * with an individual address in the address 1 field or an MPDU
299 * with a multicast address in the address 1 field of type Data
300 * or Management. */
301 if (!is_multicast_ether_addr(hdr->addr1) ||
302 type == IEEE80211_FTYPE_DATA ||
303 type == IEEE80211_FTYPE_MGMT)
304 local->dot11TransmittedFragmentCount++;
305 } else {
306 if (frag == 0)
307 local->dot11FailedCount++;
308 }
309
Vivek Natarajan375177b2010-02-09 14:50:28 +0530310 if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) &&
311 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
312 !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
313 local->ps_sdata && !(local->scanning)) {
314 if (info->flags & IEEE80211_TX_STAT_ACK) {
315 local->ps_sdata->u.mgd.flags |=
316 IEEE80211_STA_NULLFUNC_ACKED;
317 ieee80211_queue_work(&local->hw,
318 &local->dynamic_ps_enable_work);
319 } else
320 mod_timer(&local->dynamic_ps_timer, jiffies +
321 msecs_to_jiffies(10));
322 }
323
Johannes Bergf30221e2010-11-25 10:02:30 +0100324 if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX) {
325 struct ieee80211_work *wk;
326
327 rcu_read_lock();
328 list_for_each_entry_rcu(wk, &local->work_list, list) {
329 if (wk->type != IEEE80211_WORK_OFFCHANNEL_TX)
330 continue;
331 if (wk->offchan_tx.frame != skb)
332 continue;
333 wk->offchan_tx.frame = NULL;
334 break;
335 }
336 rcu_read_unlock();
Johannes Berg2e161f72010-08-12 15:38:38 +0200337 cfg80211_mgmt_tx_status(
Jouni Malinen026331c2010-02-15 12:53:10 +0200338 skb->dev, (unsigned long) skb, skb->data, skb->len,
339 !!(info->flags & IEEE80211_TX_STAT_ACK), GFP_ATOMIC);
Johannes Bergf30221e2010-11-25 10:02:30 +0100340 }
Jouni Malinen026331c2010-02-15 12:53:10 +0200341
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100342 /* this was a transmitted frame, but now we want to reuse it */
343 skb_orphan(skb);
344
Felix Fietkaueaf55532010-03-11 16:28:24 +0100345 /* Need to make a copy before skb->cb gets cleared */
346 send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) ||
347 (type != IEEE80211_FTYPE_DATA);
348
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100349 /*
350 * This is a bit racy but we can avoid a lot of work
351 * with this test...
352 */
Felix Fietkaueaf55532010-03-11 16:28:24 +0100353 if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) {
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100354 dev_kfree_skb(skb);
355 return;
356 }
357
358 /* send frame to monitor interfaces now */
359
360 if (skb_headroom(skb) < sizeof(*rthdr)) {
361 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
362 dev_kfree_skb(skb);
363 return;
364 }
365
366 rthdr = (struct ieee80211_tx_status_rtap_hdr *)
367 skb_push(skb, sizeof(*rthdr));
368
369 memset(rthdr, 0, sizeof(*rthdr));
370 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
371 rthdr->hdr.it_present =
372 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
373 (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
374 (1 << IEEE80211_RADIOTAP_RATE));
375
376 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
377 !is_multicast_ether_addr(hdr->addr1))
378 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
379
380 /*
381 * XXX: Once radiotap gets the bitmap reset thing the vendor
382 * extensions proposal contains, we can actually report
383 * the whole set of tries we did.
384 */
385 if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
386 (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
387 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
388 else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
389 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
390 if (info->status.rates[0].idx >= 0 &&
391 !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
392 rthdr->rate = sband->bitrates[
393 info->status.rates[0].idx].bitrate / 5;
394
395 /* for now report the total retry_count */
396 rthdr->data_retries = retry_count;
397
398 /* XXX: is this sufficient for BPF? */
399 skb_set_mac_header(skb, 0);
400 skb->ip_summed = CHECKSUM_UNNECESSARY;
401 skb->pkt_type = PACKET_OTHERHOST;
402 skb->protocol = htons(ETH_P_802_2);
403 memset(skb->cb, 0, sizeof(skb->cb));
404
405 rcu_read_lock();
406 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
407 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
Johannes Berg9607e6b2009-12-23 13:15:31 +0100408 if (!ieee80211_sdata_running(sdata))
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100409 continue;
410
411 if ((sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) &&
Felix Fietkaueaf55532010-03-11 16:28:24 +0100412 !send_to_cooked)
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100413 continue;
414
415 if (prev_dev) {
416 skb2 = skb_clone(skb, GFP_ATOMIC);
417 if (skb2) {
418 skb2->dev = prev_dev;
John W. Linville4efe7f52010-10-07 11:35:40 -0400419 netif_rx(skb2);
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100420 }
421 }
422
423 prev_dev = sdata->dev;
424 }
425 }
426 if (prev_dev) {
427 skb->dev = prev_dev;
John W. Linville4efe7f52010-10-07 11:35:40 -0400428 netif_rx(skb);
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100429 skb = NULL;
430 }
431 rcu_read_unlock();
432 dev_kfree_skb(skb);
433}
434EXPORT_SYMBOL(ieee80211_tx_status);