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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
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040012#include <linux/export.h>
Felix Fietkau888d04d2012-03-01 15:22:09 +010013#include <linux/etherdevice.h>
Johannes Bergfe7a5d52009-11-18 18:42:47 +010014#include <net/mac80211.h>
Johannes Bergd26ad372012-02-20 11:38:41 +010015#include <asm/unaligned.h>
Johannes Bergfe7a5d52009-11-18 18:42:47 +010016#include "ieee80211_i.h"
17#include "rate.h"
18#include "mesh.h"
19#include "led.h"
Johannes Berg948d8872011-09-29 16:04:29 +020020#include "wme.h"
Johannes Bergfe7a5d52009-11-18 18:42:47 +010021
22
23void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
24 struct sk_buff *skb)
25{
26 struct ieee80211_local *local = hw_to_local(hw);
27 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
28 int tmp;
29
30 skb->pkt_type = IEEE80211_TX_STATUS_MSG;
31 skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
32 &local->skb_queue : &local->skb_queue_unreliable, skb);
33 tmp = skb_queue_len(&local->skb_queue) +
34 skb_queue_len(&local->skb_queue_unreliable);
35 while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
36 (skb = skb_dequeue(&local->skb_queue_unreliable))) {
Felix Fietkauc3e77242012-10-08 14:39:33 +020037 ieee80211_free_txskb(hw, skb);
Johannes Bergfe7a5d52009-11-18 18:42:47 +010038 tmp--;
39 I802_DEBUG_INC(local->tx_status_drop);
40 }
41 tasklet_schedule(&local->tasklet);
42}
43EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
44
45static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
46 struct sta_info *sta,
47 struct sk_buff *skb)
48{
49 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Johannes Berg948d8872011-09-29 16:04:29 +020050 struct ieee80211_hdr *hdr = (void *)skb->data;
51 int ac;
Johannes Bergfe7a5d52009-11-18 18:42:47 +010052
53 /*
Johannes Berg697e6a02010-01-17 01:47:56 +010054 * This skb 'survived' a round-trip through the driver, and
55 * hopefully the driver didn't mangle it too badly. However,
Walter Goldens77c20612010-05-18 04:44:54 -070056 * we can definitely not rely on the control information
Johannes Bergc6fcf6b2010-01-17 01:47:59 +010057 * being correct. Clear it so we don't get junk there, and
58 * indicate that it needs new processing, but must not be
59 * modified/encrypted again.
Johannes Berg697e6a02010-01-17 01:47:56 +010060 */
61 memset(&info->control, 0, sizeof(info->control));
Johannes Berg18c94902010-01-25 19:07:39 +010062
63 info->control.jiffies = jiffies;
64 info->control.vif = &sta->sdata->vif;
Johannes Bergc6fcf6b2010-01-17 01:47:59 +010065 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING |
66 IEEE80211_TX_INTFL_RETRANSMISSION;
Christian Lampartereb7d3062010-09-21 21:36:18 +020067 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
Johannes Berg697e6a02010-01-17 01:47:56 +010068
Johannes Bergfe7a5d52009-11-18 18:42:47 +010069 sta->tx_filtered_count++;
70
Johannes Berg8a8656f2011-09-29 16:04:31 +020071 /*
72 * Clear more-data bit on filtered frames, it might be set
73 * but later frames might time out so it might have to be
74 * clear again ... It's all rather unlikely (this frame
75 * should time out first, right?) but let's not confuse
76 * peers unnecessarily.
77 */
78 if (hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_MOREDATA))
79 hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_MOREDATA);
80
Johannes Berg948d8872011-09-29 16:04:29 +020081 if (ieee80211_is_data_qos(hdr->frame_control)) {
Johannes Berg47086fc2011-09-29 16:04:33 +020082 u8 *p = ieee80211_get_qos_ctl(hdr);
83 int tid = *p & IEEE80211_QOS_CTL_TID_MASK;
84
85 /*
86 * Clear EOSP if set, this could happen e.g.
87 * if an absence period (us being a P2P GO)
88 * shortens the SP.
89 */
90 if (*p & IEEE80211_QOS_CTL_EOSP)
91 *p &= ~IEEE80211_QOS_CTL_EOSP;
Johannes Berg948d8872011-09-29 16:04:29 +020092 ac = ieee802_1d_to_ac[tid & 7];
93 } else {
94 ac = IEEE80211_AC_BE;
95 }
96
Johannes Bergfe7a5d52009-11-18 18:42:47 +010097 /*
98 * Clear the TX filter mask for this STA when sending the next
99 * packet. If the STA went to power save mode, this will happen
100 * when it wakes up for the next time.
101 */
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200102 set_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT);
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100103
104 /*
105 * This code races in the following way:
106 *
107 * (1) STA sends frame indicating it will go to sleep and does so
108 * (2) hardware/firmware adds STA to filter list, passes frame up
109 * (3) hardware/firmware processes TX fifo and suppresses a frame
110 * (4) we get TX status before having processed the frame and
111 * knowing that the STA has gone to sleep.
112 *
113 * This is actually quite unlikely even when both those events are
114 * processed from interrupts coming in quickly after one another or
115 * even at the same time because we queue both TX status events and
116 * RX frames to be processed by a tasklet and process them in the
117 * same order that they were received or TX status last. Hence, there
118 * is no race as long as the frame RX is processed before the next TX
119 * status, which drivers can ensure, see below.
120 *
121 * Note that this can only happen if the hardware or firmware can
122 * actually add STAs to the filter list, if this is done by the
123 * driver in response to set_tim() (which will only reduce the race
124 * this whole filtering tries to solve, not completely solve it)
125 * this situation cannot happen.
126 *
127 * To completely solve this race drivers need to make sure that they
128 * (a) don't mix the irq-safe/not irq-safe TX status/RX processing
129 * functions and
130 * (b) always process RX events before TX status events if ordering
131 * can be unknown, for example with different interrupt status
132 * bits.
Arik Nemtsovd057e5a2011-01-31 22:29:13 +0200133 * (c) if PS mode transitions are manual (i.e. the flag
134 * %IEEE80211_HW_AP_LINK_PS is set), always process PS state
135 * changes before calling TX status events if ordering can be
136 * unknown.
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100137 */
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200138 if (test_sta_flag(sta, WLAN_STA_PS_STA) &&
Johannes Berg948d8872011-09-29 16:04:29 +0200139 skb_queue_len(&sta->tx_filtered[ac]) < STA_MAX_TX_BUFFER) {
140 skb_queue_tail(&sta->tx_filtered[ac], skb);
Johannes Bergc868cb352011-09-29 16:04:27 +0200141 sta_info_recalc_tim(sta);
Johannes Berg60750392011-09-29 16:04:28 +0200142
143 if (!timer_pending(&local->sta_cleanup))
144 mod_timer(&local->sta_cleanup,
145 round_jiffies(jiffies +
146 STA_INFO_CLEANUP_INTERVAL));
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100147 return;
148 }
149
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200150 if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100151 !(info->flags & IEEE80211_TX_INTFL_RETRIED)) {
152 /* Software retry the packet once */
153 info->flags |= IEEE80211_TX_INTFL_RETRIED;
154 ieee80211_add_pending_skb(local, skb);
155 return;
156 }
157
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200158 ps_dbg_ratelimited(sta->sdata,
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);
Felix Fietkauc3e77242012-10-08 14:39:33 +0200162 ieee80211_free_txskb(&local->hw, skb);
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100163}
164
Felix Fietkauf0425be2011-08-28 21:11:01 +0200165static void ieee80211_check_pending_bar(struct sta_info *sta, u8 *addr, u8 tid)
166{
167 struct tid_ampdu_tx *tid_tx;
168
169 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
170 if (!tid_tx || !tid_tx->bar_pending)
171 return;
172
173 tid_tx->bar_pending = false;
Felix Fietkau8c771242011-08-20 15:53:55 +0200174 ieee80211_send_bar(&sta->sdata->vif, addr, tid, tid_tx->failed_bar_ssn);
Felix Fietkauf0425be2011-08-28 21:11:01 +0200175}
176
Johannes Berg0f782312009-12-01 13:37:02 +0100177static void ieee80211_frame_acked(struct sta_info *sta, struct sk_buff *skb)
178{
179 struct ieee80211_mgmt *mgmt = (void *) skb->data;
180 struct ieee80211_local *local = sta->local;
181 struct ieee80211_sub_if_data *sdata = sta->sdata;
182
Felix Fietkauf0425be2011-08-28 21:11:01 +0200183 if (ieee80211_is_data_qos(mgmt->frame_control)) {
184 struct ieee80211_hdr *hdr = (void *) skb->data;
185 u8 *qc = ieee80211_get_qos_ctl(hdr);
186 u16 tid = qc[0] & 0xf;
187
188 ieee80211_check_pending_bar(sta, hdr->addr1, tid);
189 }
190
Johannes Berg0f782312009-12-01 13:37:02 +0100191 if (ieee80211_is_action(mgmt->frame_control) &&
192 sdata->vif.type == NL80211_IFTYPE_STATION &&
193 mgmt->u.action.category == WLAN_CATEGORY_HT &&
194 mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS) {
195 /*
196 * This update looks racy, but isn't -- if we come
197 * here we've definitely got a station that we're
198 * talking to, and on a managed interface that can
199 * only be the AP. And the only other place updating
200 * this variable is before we're associated.
201 */
202 switch (mgmt->u.action.u.ht_smps.smps_control) {
203 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
204 sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_DYNAMIC;
205 break;
206 case WLAN_HT_SMPS_CONTROL_STATIC:
207 sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_STATIC;
208 break;
209 case WLAN_HT_SMPS_CONTROL_DISABLED:
210 default: /* shouldn't happen since we don't send that */
211 sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_OFF;
212 break;
213 }
214
215 ieee80211_queue_work(&local->hw, &local->recalc_smps);
216 }
217}
218
Felix Fietkauf0425be2011-08-28 21:11:01 +0200219static void ieee80211_set_bar_pending(struct sta_info *sta, u8 tid, u16 ssn)
220{
221 struct tid_ampdu_tx *tid_tx;
222
223 tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
224 if (!tid_tx)
225 return;
226
227 tid_tx->failed_bar_ssn = ssn;
228 tid_tx->bar_pending = true;
229}
230
Helmut Schaaa2fe8162011-10-11 18:08:54 +0200231static int ieee80211_tx_radiotap_len(struct ieee80211_tx_info *info)
232{
233 int len = sizeof(struct ieee80211_radiotap_header);
234
235 /* IEEE80211_RADIOTAP_RATE rate */
236 if (info->status.rates[0].idx >= 0 &&
237 !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
238 len += 2;
239
240 /* IEEE80211_RADIOTAP_TX_FLAGS */
241 len += 2;
242
243 /* IEEE80211_RADIOTAP_DATA_RETRIES */
244 len += 1;
245
Helmut Schaa7f2a5e22011-10-11 18:08:55 +0200246 /* IEEE80211_TX_RC_MCS */
247 if (info->status.rates[0].idx >= 0 &&
248 info->status.rates[0].flags & IEEE80211_TX_RC_MCS)
249 len += 3;
250
Helmut Schaaa2fe8162011-10-11 18:08:54 +0200251 return len;
252}
253
254static void ieee80211_add_tx_radiotap_header(struct ieee80211_supported_band
255 *sband, struct sk_buff *skb,
256 int retry_count, int rtap_len)
257{
258 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
259 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
260 struct ieee80211_radiotap_header *rthdr;
261 unsigned char *pos;
Helmut Schaa9c8f2c42011-11-18 17:02:16 +0100262 u16 txflags;
Helmut Schaaa2fe8162011-10-11 18:08:54 +0200263
264 rthdr = (struct ieee80211_radiotap_header *) skb_push(skb, rtap_len);
265
266 memset(rthdr, 0, rtap_len);
267 rthdr->it_len = cpu_to_le16(rtap_len);
268 rthdr->it_present =
269 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
270 (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
271 pos = (unsigned char *)(rthdr + 1);
272
273 /*
274 * XXX: Once radiotap gets the bitmap reset thing the vendor
275 * extensions proposal contains, we can actually report
276 * the whole set of tries we did.
277 */
278
279 /* IEEE80211_RADIOTAP_RATE */
280 if (info->status.rates[0].idx >= 0 &&
281 !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS)) {
282 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE);
283 *pos = sband->bitrates[info->status.rates[0].idx].bitrate / 5;
284 /* padding for tx flags */
285 pos += 2;
286 }
287
288 /* IEEE80211_RADIOTAP_TX_FLAGS */
289 txflags = 0;
290 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
291 !is_multicast_ether_addr(hdr->addr1))
Helmut Schaa9c8f2c42011-11-18 17:02:16 +0100292 txflags |= IEEE80211_RADIOTAP_F_TX_FAIL;
Helmut Schaaa2fe8162011-10-11 18:08:54 +0200293
294 if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
295 (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
Helmut Schaa9c8f2c42011-11-18 17:02:16 +0100296 txflags |= IEEE80211_RADIOTAP_F_TX_CTS;
Helmut Schaaa2fe8162011-10-11 18:08:54 +0200297 else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
Helmut Schaa9c8f2c42011-11-18 17:02:16 +0100298 txflags |= IEEE80211_RADIOTAP_F_TX_RTS;
Helmut Schaaa2fe8162011-10-11 18:08:54 +0200299
300 put_unaligned_le16(txflags, pos);
301 pos += 2;
302
303 /* IEEE80211_RADIOTAP_DATA_RETRIES */
304 /* for now report the total retry_count */
305 *pos = retry_count;
306 pos++;
Helmut Schaa7f2a5e22011-10-11 18:08:55 +0200307
308 /* IEEE80211_TX_RC_MCS */
309 if (info->status.rates[0].idx >= 0 &&
310 info->status.rates[0].flags & IEEE80211_TX_RC_MCS) {
311 rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS);
312 pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
313 IEEE80211_RADIOTAP_MCS_HAVE_GI |
314 IEEE80211_RADIOTAP_MCS_HAVE_BW;
315 if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
316 pos[1] |= IEEE80211_RADIOTAP_MCS_SGI;
317 if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
318 pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40;
319 if (info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)
320 pos[1] |= IEEE80211_RADIOTAP_MCS_FMT_GF;
321 pos[2] = info->status.rates[0].idx;
322 pos += 3;
323 }
324
Helmut Schaaa2fe8162011-10-11 18:08:54 +0200325}
326
Johannes Berg99ba2a12010-11-24 08:10:06 +0100327/*
328 * Use a static threshold for now, best value to be determined
329 * by testing ...
330 * Should it depend on:
331 * - on # of retransmissions
332 * - current throughput (higher value for higher tpt)?
333 */
334#define STA_LOST_PKT_THRESHOLD 50
335
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100336void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
337{
338 struct sk_buff *skb2;
339 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
340 struct ieee80211_local *local = hw_to_local(hw);
341 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100342 __le16 fc;
343 struct ieee80211_supported_band *sband;
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100344 struct ieee80211_sub_if_data *sdata;
345 struct net_device *prev_dev = NULL;
Johannes Bergabe60632009-11-25 17:46:18 +0100346 struct sta_info *sta, *tmp;
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100347 int retry_count = -1, i;
Juuso Oikarinen0c869802010-04-22 10:27:48 +0300348 int rates_idx = -1;
Felix Fietkaueaf55532010-03-11 16:28:24 +0100349 bool send_to_cooked;
Felix Fietkau04ac3c02010-12-02 21:01:08 +0100350 bool acked;
Helmut Schaae69dede2011-08-11 16:17:42 +0200351 struct ieee80211_bar *bar;
Helmut Schaaa2fe8162011-10-11 18:08:54 +0200352 int rtap_len;
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100353
354 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
Lorenzo Bianconid01b3162012-04-06 20:48:15 +0200355 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
356 !(info->flags & IEEE80211_TX_STAT_AMPDU)) {
357 /* just the first aggr frame carry status info */
358 info->status.rates[i].idx = -1;
359 info->status.rates[i].count = 0;
360 break;
361 } else if (info->status.rates[i].idx < 0) {
Helmut Schaabe7974a2011-03-21 15:07:55 +0100362 break;
363 } else if (i >= hw->max_report_rates) {
364 /* the HW cannot have attempted that rate */
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100365 info->status.rates[i].idx = -1;
366 info->status.rates[i].count = 0;
Helmut Schaabe7974a2011-03-21 15:07:55 +0100367 break;
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100368 }
369
370 retry_count += info->status.rates[i].count;
371 }
Helmut Schaabe7974a2011-03-21 15:07:55 +0100372 rates_idx = i - 1;
373
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100374 if (retry_count < 0)
375 retry_count = 0;
376
377 rcu_read_lock();
378
379 sband = local->hw.wiphy->bands[info->band];
Vivek Natarajan375177b2010-02-09 14:50:28 +0530380 fc = hdr->frame_control;
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100381
Johannes Bergabe60632009-11-25 17:46:18 +0100382 for_each_sta_info(local, hdr->addr1, sta, tmp) {
383 /* skip wrong virtual interface */
Joe Perchesb203ca32012-05-08 18:56:52 +0000384 if (!ether_addr_equal(hdr->addr2, sta->sdata->vif.addr))
Johannes Bergabe60632009-11-25 17:46:18 +0100385 continue;
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100386
Johannes Berg47086fc2011-09-29 16:04:33 +0200387 if (info->flags & IEEE80211_TX_STATUS_EOSP)
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200388 clear_sta_flag(sta, WLAN_STA_SP);
Johannes Berg47086fc2011-09-29 16:04:33 +0200389
Felix Fietkau04ac3c02010-12-02 21:01:08 +0100390 acked = !!(info->flags & IEEE80211_TX_STAT_ACK);
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200391 if (!acked && test_sta_flag(sta, WLAN_STA_PS_STA)) {
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100392 /*
393 * The STA is in power save mode, so assume
394 * that this TX packet failed because of that.
395 */
396 ieee80211_handle_filtered_frame(local, sta, skb);
397 rcu_read_unlock();
398 return;
399 }
400
Juuso Oikarinen0c869802010-04-22 10:27:48 +0300401 if ((local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) &&
402 (rates_idx != -1))
403 sta->last_tx_rate = info->status.rates[rates_idx];
404
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100405 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
406 (ieee80211_is_data_qos(fc))) {
407 u16 tid, ssn;
408 u8 *qc;
409
410 qc = ieee80211_get_qos_ctl(hdr);
411 tid = qc[0] & 0xf;
412 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
413 & IEEE80211_SCTL_SEQ);
Felix Fietkau8c771242011-08-20 15:53:55 +0200414 ieee80211_send_bar(&sta->sdata->vif, hdr->addr1,
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100415 tid, ssn);
416 }
417
Helmut Schaae69dede2011-08-11 16:17:42 +0200418 if (!acked && ieee80211_is_back_req(fc)) {
Johannes Berg8e7c4e42012-01-20 13:52:36 +0100419 u16 tid, control;
Felix Fietkau71076762011-09-15 09:37:46 +0200420
Helmut Schaae69dede2011-08-11 16:17:42 +0200421 /*
Felix Fietkau71076762011-09-15 09:37:46 +0200422 * BAR failed, store the last SSN and retry sending
423 * the BAR when the next unicast transmission on the
424 * same TID succeeds.
Helmut Schaae69dede2011-08-11 16:17:42 +0200425 */
426 bar = (struct ieee80211_bar *) skb->data;
Felix Fietkau71076762011-09-15 09:37:46 +0200427 control = le16_to_cpu(bar->control);
428 if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) {
Felix Fietkauf0425be2011-08-28 21:11:01 +0200429 u16 ssn = le16_to_cpu(bar->start_seq_num);
430
Felix Fietkau71076762011-09-15 09:37:46 +0200431 tid = (control &
Helmut Schaae69dede2011-08-11 16:17:42 +0200432 IEEE80211_BAR_CTRL_TID_INFO_MASK) >>
433 IEEE80211_BAR_CTRL_TID_INFO_SHIFT;
Felix Fietkauf0425be2011-08-28 21:11:01 +0200434
435 ieee80211_set_bar_pending(sta, tid, ssn);
Helmut Schaae69dede2011-08-11 16:17:42 +0200436 }
437 }
438
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100439 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
440 ieee80211_handle_filtered_frame(local, sta, skb);
441 rcu_read_unlock();
442 return;
443 } else {
Felix Fietkau04ac3c02010-12-02 21:01:08 +0100444 if (!acked)
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100445 sta->tx_retry_failed++;
446 sta->tx_retry_count += retry_count;
447 }
448
449 rate_control_tx_status(local, sband, sta, skb);
450 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
451 ieee80211s_update_metric(local, sta, skb);
Johannes Berg0f782312009-12-01 13:37:02 +0100452
Felix Fietkau04ac3c02010-12-02 21:01:08 +0100453 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked)
Johannes Berg0f782312009-12-01 13:37:02 +0100454 ieee80211_frame_acked(sta, skb);
Johannes Berg99ba2a12010-11-24 08:10:06 +0100455
Felix Fietkau04ac3c02010-12-02 21:01:08 +0100456 if ((sta->sdata->vif.type == NL80211_IFTYPE_STATION) &&
457 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
458 ieee80211_sta_tx_notify(sta->sdata, (void *) skb->data, acked);
459
Johannes Berg99ba2a12010-11-24 08:10:06 +0100460 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
461 if (info->flags & IEEE80211_TX_STAT_ACK) {
462 if (sta->lost_packets)
463 sta->lost_packets = 0;
464 } else if (++sta->lost_packets >= STA_LOST_PKT_THRESHOLD) {
465 cfg80211_cqm_pktloss_notify(sta->sdata->dev,
466 sta->sta.addr,
467 sta->lost_packets,
468 GFP_ATOMIC);
469 sta->lost_packets = 0;
470 }
471 }
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100472 }
473
474 rcu_read_unlock();
475
476 ieee80211_led_tx(local, 0);
477
478 /* SNMP counters
479 * Fragments are passed to low-level drivers as separate skbs, so these
480 * are actually fragments, not frames. Update frame counters only for
481 * the first fragment of the frame. */
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100482 if (info->flags & IEEE80211_TX_STAT_ACK) {
Helmut Schaaadf5ace2011-12-08 13:11:55 +0100483 if (ieee80211_is_first_frag(hdr->seq_ctrl)) {
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100484 local->dot11TransmittedFrameCount++;
485 if (is_multicast_ether_addr(hdr->addr1))
486 local->dot11MulticastTransmittedFrameCount++;
487 if (retry_count > 0)
488 local->dot11RetryCount++;
489 if (retry_count > 1)
490 local->dot11MultipleRetryCount++;
491 }
492
493 /* This counter shall be incremented for an acknowledged MPDU
494 * with an individual address in the address 1 field or an MPDU
495 * with a multicast address in the address 1 field of type Data
496 * or Management. */
497 if (!is_multicast_ether_addr(hdr->addr1) ||
Helmut Schaaadf5ace2011-12-08 13:11:55 +0100498 ieee80211_is_data(fc) ||
499 ieee80211_is_mgmt(fc))
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100500 local->dot11TransmittedFragmentCount++;
501 } else {
Helmut Schaaadf5ace2011-12-08 13:11:55 +0100502 if (ieee80211_is_first_frag(hdr->seq_ctrl))
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100503 local->dot11FailedCount++;
504 }
505
Vivek Natarajan375177b2010-02-09 14:50:28 +0530506 if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) &&
507 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
508 !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
509 local->ps_sdata && !(local->scanning)) {
510 if (info->flags & IEEE80211_TX_STAT_ACK) {
511 local->ps_sdata->u.mgd.flags |=
512 IEEE80211_STA_NULLFUNC_ACKED;
Vivek Natarajan375177b2010-02-09 14:50:28 +0530513 } else
514 mod_timer(&local->dynamic_ps_timer, jiffies +
515 msecs_to_jiffies(10));
516 }
517
Johannes Bergf30221e2010-11-25 10:02:30 +0100518 if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX) {
Johannes Berg4334ec82011-02-02 16:58:06 +0100519 u64 cookie = (unsigned long)skb;
Felix Fietkau1bad5382012-09-08 11:58:30 +0200520 bool found = false;
521
Johannes Berg2eb278e2012-06-05 14:28:42 +0200522 acked = info->flags & IEEE80211_TX_STAT_ACK;
Johannes Bergf30221e2010-11-25 10:02:30 +0100523
Felix Fietkau1bad5382012-09-08 11:58:30 +0200524 rcu_read_lock();
Johannes Bergf142c6b2012-06-18 20:07:15 +0200525
Felix Fietkau1bad5382012-09-08 11:58:30 +0200526 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
527 if (!sdata->dev)
528 continue;
Johannes Bergf142c6b2012-06-18 20:07:15 +0200529
Felix Fietkau1bad5382012-09-08 11:58:30 +0200530 if (skb->dev != sdata->dev)
531 continue;
532
533 found = true;
534 break;
Johannes Bergf142c6b2012-06-18 20:07:15 +0200535 }
Felix Fietkau1bad5382012-09-08 11:58:30 +0200536
537 if (!skb->dev) {
538 sdata = rcu_dereference(local->p2p_sdata);
539 if (sdata)
540 found = true;
541 }
542
543 if (!found)
544 skb->dev = NULL;
545 else if (ieee80211_is_nullfunc(hdr->frame_control) ||
546 ieee80211_is_qos_nullfunc(hdr->frame_control)) {
547 cfg80211_probe_status(sdata->dev, hdr->addr1,
548 cookie, acked, GFP_ATOMIC);
549 } else {
550 cfg80211_mgmt_tx_status(&sdata->wdev, cookie, skb->data,
551 skb->len, acked, GFP_ATOMIC);
552 }
553
554 rcu_read_unlock();
Johannes Bergf30221e2010-11-25 10:02:30 +0100555 }
Jouni Malinen026331c2010-02-15 12:53:10 +0200556
Johannes Berga729cff2011-11-06 14:13:34 +0100557 if (unlikely(info->ack_frame_id)) {
558 struct sk_buff *ack_skb;
559 unsigned long flags;
560
561 spin_lock_irqsave(&local->ack_status_lock, flags);
562 ack_skb = idr_find(&local->ack_status_frames,
563 info->ack_frame_id);
564 if (ack_skb)
565 idr_remove(&local->ack_status_frames,
566 info->ack_frame_id);
567 spin_unlock_irqrestore(&local->ack_status_lock, flags);
568
569 /* consumes ack_skb */
570 if (ack_skb)
571 skb_complete_wifi_ack(ack_skb,
572 info->flags & IEEE80211_TX_STAT_ACK);
573 }
574
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100575 /* this was a transmitted frame, but now we want to reuse it */
576 skb_orphan(skb);
577
Felix Fietkaueaf55532010-03-11 16:28:24 +0100578 /* Need to make a copy before skb->cb gets cleared */
579 send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) ||
Helmut Schaaadf5ace2011-12-08 13:11:55 +0100580 !(ieee80211_is_data(fc));
Felix Fietkaueaf55532010-03-11 16:28:24 +0100581
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100582 /*
583 * This is a bit racy but we can avoid a lot of work
584 * with this test...
585 */
Felix Fietkaueaf55532010-03-11 16:28:24 +0100586 if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) {
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100587 dev_kfree_skb(skb);
588 return;
589 }
590
591 /* send frame to monitor interfaces now */
Helmut Schaaa2fe8162011-10-11 18:08:54 +0200592 rtap_len = ieee80211_tx_radiotap_len(info);
593 if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) {
Joe Perchesf0d23202012-05-15 14:20:30 -0700594 pr_err("ieee80211_tx_status: headroom too small\n");
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100595 dev_kfree_skb(skb);
596 return;
597 }
Helmut Schaaa2fe8162011-10-11 18:08:54 +0200598 ieee80211_add_tx_radiotap_header(sband, skb, retry_count, rtap_len);
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100599
600 /* XXX: is this sufficient for BPF? */
601 skb_set_mac_header(skb, 0);
602 skb->ip_summed = CHECKSUM_UNNECESSARY;
603 skb->pkt_type = PACKET_OTHERHOST;
604 skb->protocol = htons(ETH_P_802_2);
605 memset(skb->cb, 0, sizeof(skb->cb));
606
607 rcu_read_lock();
608 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
609 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
Johannes Berg9607e6b2009-12-23 13:15:31 +0100610 if (!ieee80211_sdata_running(sdata))
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100611 continue;
612
613 if ((sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) &&
Felix Fietkaueaf55532010-03-11 16:28:24 +0100614 !send_to_cooked)
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100615 continue;
616
617 if (prev_dev) {
618 skb2 = skb_clone(skb, GFP_ATOMIC);
619 if (skb2) {
620 skb2->dev = prev_dev;
John W. Linville4efe7f52010-10-07 11:35:40 -0400621 netif_rx(skb2);
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100622 }
623 }
624
625 prev_dev = sdata->dev;
626 }
627 }
628 if (prev_dev) {
629 skb->dev = prev_dev;
John W. Linville4efe7f52010-10-07 11:35:40 -0400630 netif_rx(skb);
Johannes Bergfe7a5d52009-11-18 18:42:47 +0100631 skb = NULL;
632 }
633 rcu_read_unlock();
634 dev_kfree_skb(skb);
635}
636EXPORT_SYMBOL(ieee80211_tx_status);
Arik Nemtsov8178d382011-04-18 14:22:28 +0300637
638void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets)
639{
640 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
641 cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr,
642 num_packets, GFP_ATOMIC);
643}
644EXPORT_SYMBOL(ieee80211_report_low_ack);
Johannes Berg6096de72011-11-04 11:18:10 +0100645
646void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb)
647{
Johannes Berga729cff2011-11-06 14:13:34 +0100648 struct ieee80211_local *local = hw_to_local(hw);
649 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
650
651 if (unlikely(info->ack_frame_id)) {
652 struct sk_buff *ack_skb;
653 unsigned long flags;
654
655 spin_lock_irqsave(&local->ack_status_lock, flags);
656 ack_skb = idr_find(&local->ack_status_frames,
657 info->ack_frame_id);
658 if (ack_skb)
659 idr_remove(&local->ack_status_frames,
660 info->ack_frame_id);
661 spin_unlock_irqrestore(&local->ack_status_lock, flags);
662
663 /* consumes ack_skb */
664 if (ack_skb)
665 dev_kfree_skb_any(ack_skb);
666 }
667
Johannes Berg6096de72011-11-04 11:18:10 +0100668 dev_kfree_skb_any(skb);
669}
670EXPORT_SYMBOL(ieee80211_free_txskb);