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Commit | Line | Data |
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fe7a5d5c JB |
1 | /* |
2 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
3 | * Copyright 2005-2006, Devicescape Software, Inc. | |
4 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
026331c4 | 5 | * Copyright 2008-2010 Johannes Berg <johannes@sipsolutions.net> |
fe7a5d5c JB |
6 | * |
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 | ||
bc3b2d7f | 12 | #include <linux/export.h> |
888d04df | 13 | #include <linux/etherdevice.h> |
ad38bfc9 | 14 | #include <linux/time.h> |
fe7a5d5c | 15 | #include <net/mac80211.h> |
d26ad377 | 16 | #include <asm/unaligned.h> |
fe7a5d5c JB |
17 | #include "ieee80211_i.h" |
18 | #include "rate.h" | |
19 | #include "mesh.h" | |
20 | #include "led.h" | |
948d887d | 21 | #include "wme.h" |
fe7a5d5c JB |
22 | |
23 | ||
24 | void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw, | |
25 | struct sk_buff *skb) | |
26 | { | |
27 | struct ieee80211_local *local = hw_to_local(hw); | |
28 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
29 | int tmp; | |
30 | ||
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))) { | |
c3e7724b | 38 | ieee80211_free_txskb(hw, skb); |
fe7a5d5c JB |
39 | tmp--; |
40 | I802_DEBUG_INC(local->tx_status_drop); | |
41 | } | |
42 | tasklet_schedule(&local->tasklet); | |
43 | } | |
44 | EXPORT_SYMBOL(ieee80211_tx_status_irqsafe); | |
45 | ||
46 | static void ieee80211_handle_filtered_frame(struct ieee80211_local *local, | |
47 | struct sta_info *sta, | |
48 | struct sk_buff *skb) | |
49 | { | |
50 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
948d887d JB |
51 | struct ieee80211_hdr *hdr = (void *)skb->data; |
52 | int ac; | |
fe7a5d5c | 53 | |
697e6a0f JB |
54 | /* |
55 | * This skb 'survived' a round-trip through the driver, and | |
56 | * hopefully the driver didn't mangle it too badly. However, | |
77c2061d | 57 | * we can definitely not rely on the control information |
c6fcf6bc JB |
58 | * being correct. Clear it so we don't get junk there, and |
59 | * indicate that it needs new processing, but must not be | |
60 | * modified/encrypted again. | |
697e6a0f JB |
61 | */ |
62 | memset(&info->control, 0, sizeof(info->control)); | |
18c94907 JB |
63 | |
64 | info->control.jiffies = jiffies; | |
65 | info->control.vif = &sta->sdata->vif; | |
c6fcf6bc JB |
66 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING | |
67 | IEEE80211_TX_INTFL_RETRANSMISSION; | |
eb7d3066 | 68 | info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS; |
697e6a0f | 69 | |
fe7a5d5c JB |
70 | sta->tx_filtered_count++; |
71 | ||
8a8656fa JB |
72 | /* |
73 | * Clear more-data bit on filtered frames, it might be set | |
74 | * but later frames might time out so it might have to be | |
75 | * clear again ... It's all rather unlikely (this frame | |
76 | * should time out first, right?) but let's not confuse | |
77 | * peers unnecessarily. | |
78 | */ | |
79 | if (hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_MOREDATA)) | |
80 | hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_MOREDATA); | |
81 | ||
948d887d | 82 | if (ieee80211_is_data_qos(hdr->frame_control)) { |
47086fc5 JB |
83 | u8 *p = ieee80211_get_qos_ctl(hdr); |
84 | int tid = *p & IEEE80211_QOS_CTL_TID_MASK; | |
85 | ||
86 | /* | |
87 | * Clear EOSP if set, this could happen e.g. | |
88 | * if an absence period (us being a P2P GO) | |
89 | * shortens the SP. | |
90 | */ | |
91 | if (*p & IEEE80211_QOS_CTL_EOSP) | |
92 | *p &= ~IEEE80211_QOS_CTL_EOSP; | |
948d887d JB |
93 | ac = ieee802_1d_to_ac[tid & 7]; |
94 | } else { | |
95 | ac = IEEE80211_AC_BE; | |
96 | } | |
97 | ||
fe7a5d5c JB |
98 | /* |
99 | * Clear the TX filter mask for this STA when sending the next | |
100 | * packet. If the STA went to power save mode, this will happen | |
101 | * when it wakes up for the next time. | |
102 | */ | |
c2c98fde | 103 | set_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT); |
fe7a5d5c JB |
104 | |
105 | /* | |
106 | * This code races in the following way: | |
107 | * | |
108 | * (1) STA sends frame indicating it will go to sleep and does so | |
109 | * (2) hardware/firmware adds STA to filter list, passes frame up | |
110 | * (3) hardware/firmware processes TX fifo and suppresses a frame | |
111 | * (4) we get TX status before having processed the frame and | |
112 | * knowing that the STA has gone to sleep. | |
113 | * | |
114 | * This is actually quite unlikely even when both those events are | |
115 | * processed from interrupts coming in quickly after one another or | |
116 | * even at the same time because we queue both TX status events and | |
117 | * RX frames to be processed by a tasklet and process them in the | |
118 | * same order that they were received or TX status last. Hence, there | |
119 | * is no race as long as the frame RX is processed before the next TX | |
120 | * status, which drivers can ensure, see below. | |
121 | * | |
122 | * Note that this can only happen if the hardware or firmware can | |
123 | * actually add STAs to the filter list, if this is done by the | |
124 | * driver in response to set_tim() (which will only reduce the race | |
125 | * this whole filtering tries to solve, not completely solve it) | |
126 | * this situation cannot happen. | |
127 | * | |
128 | * To completely solve this race drivers need to make sure that they | |
129 | * (a) don't mix the irq-safe/not irq-safe TX status/RX processing | |
130 | * functions and | |
131 | * (b) always process RX events before TX status events if ordering | |
132 | * can be unknown, for example with different interrupt status | |
133 | * bits. | |
d057e5a3 AN |
134 | * (c) if PS mode transitions are manual (i.e. the flag |
135 | * %IEEE80211_HW_AP_LINK_PS is set), always process PS state | |
136 | * changes before calling TX status events if ordering can be | |
137 | * unknown. | |
fe7a5d5c | 138 | */ |
c2c98fde | 139 | if (test_sta_flag(sta, WLAN_STA_PS_STA) && |
948d887d JB |
140 | skb_queue_len(&sta->tx_filtered[ac]) < STA_MAX_TX_BUFFER) { |
141 | skb_queue_tail(&sta->tx_filtered[ac], skb); | |
c868cb35 | 142 | sta_info_recalc_tim(sta); |
60750397 JB |
143 | |
144 | if (!timer_pending(&local->sta_cleanup)) | |
145 | mod_timer(&local->sta_cleanup, | |
146 | round_jiffies(jiffies + | |
147 | STA_INFO_CLEANUP_INTERVAL)); | |
fe7a5d5c JB |
148 | return; |
149 | } | |
150 | ||
c2c98fde | 151 | if (!test_sta_flag(sta, WLAN_STA_PS_STA) && |
fe7a5d5c JB |
152 | !(info->flags & IEEE80211_TX_INTFL_RETRIED)) { |
153 | /* Software retry the packet once */ | |
154 | info->flags |= IEEE80211_TX_INTFL_RETRIED; | |
155 | ieee80211_add_pending_skb(local, skb); | |
156 | return; | |
157 | } | |
158 | ||
bdcbd8e0 JB |
159 | ps_dbg_ratelimited(sta->sdata, |
160 | "dropped TX filtered frame, queue_len=%d PS=%d @%lu\n", | |
161 | skb_queue_len(&sta->tx_filtered[ac]), | |
162 | !!test_sta_flag(sta, WLAN_STA_PS_STA), jiffies); | |
c3e7724b | 163 | ieee80211_free_txskb(&local->hw, skb); |
fe7a5d5c JB |
164 | } |
165 | ||
f0425bed FF |
166 | static void ieee80211_check_pending_bar(struct sta_info *sta, u8 *addr, u8 tid) |
167 | { | |
168 | struct tid_ampdu_tx *tid_tx; | |
169 | ||
170 | tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); | |
171 | if (!tid_tx || !tid_tx->bar_pending) | |
172 | return; | |
173 | ||
174 | tid_tx->bar_pending = false; | |
8c771244 | 175 | ieee80211_send_bar(&sta->sdata->vif, addr, tid, tid_tx->failed_bar_ssn); |
f0425bed FF |
176 | } |
177 | ||
0f78231b JB |
178 | static void ieee80211_frame_acked(struct sta_info *sta, struct sk_buff *skb) |
179 | { | |
180 | struct ieee80211_mgmt *mgmt = (void *) skb->data; | |
181 | struct ieee80211_local *local = sta->local; | |
182 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
183 | ||
0c5b9329 FF |
184 | if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) |
185 | sta->last_rx = jiffies; | |
186 | ||
f0425bed FF |
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; | |
191 | ||
192 | ieee80211_check_pending_bar(sta, hdr->addr1, tid); | |
193 | } | |
194 | ||
0f78231b | 195 | if (ieee80211_is_action(mgmt->frame_control) && |
0f78231b | 196 | mgmt->u.action.category == WLAN_CATEGORY_HT && |
04ecd257 | 197 | mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS && |
04ecd257 | 198 | ieee80211_sdata_running(sdata)) { |
687da132 EG |
199 | enum ieee80211_smps_mode smps_mode; |
200 | ||
0f78231b JB |
201 | switch (mgmt->u.action.u.ht_smps.smps_control) { |
202 | case WLAN_HT_SMPS_CONTROL_DYNAMIC: | |
687da132 | 203 | smps_mode = IEEE80211_SMPS_DYNAMIC; |
0f78231b JB |
204 | break; |
205 | case WLAN_HT_SMPS_CONTROL_STATIC: | |
687da132 | 206 | smps_mode = IEEE80211_SMPS_STATIC; |
0f78231b JB |
207 | break; |
208 | case WLAN_HT_SMPS_CONTROL_DISABLED: | |
209 | default: /* shouldn't happen since we don't send that */ | |
687da132 | 210 | smps_mode = IEEE80211_SMPS_OFF; |
0f78231b JB |
211 | break; |
212 | } | |
213 | ||
687da132 EG |
214 | if (sdata->vif.type == NL80211_IFTYPE_STATION) { |
215 | /* | |
216 | * This update looks racy, but isn't -- if we come | |
217 | * here we've definitely got a station that we're | |
218 | * talking to, and on a managed interface that can | |
219 | * only be the AP. And the only other place updating | |
220 | * this variable in managed mode is before association. | |
221 | */ | |
222 | sdata->smps_mode = smps_mode; | |
223 | ieee80211_queue_work(&local->hw, &sdata->recalc_smps); | |
224 | } else if (sdata->vif.type == NL80211_IFTYPE_AP || | |
225 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { | |
226 | sta->known_smps_mode = smps_mode; | |
227 | } | |
0f78231b JB |
228 | } |
229 | } | |
230 | ||
f0425bed FF |
231 | static void ieee80211_set_bar_pending(struct sta_info *sta, u8 tid, u16 ssn) |
232 | { | |
233 | struct tid_ampdu_tx *tid_tx; | |
234 | ||
235 | tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]); | |
236 | if (!tid_tx) | |
237 | return; | |
238 | ||
239 | tid_tx->failed_bar_ssn = ssn; | |
240 | tid_tx->bar_pending = true; | |
241 | } | |
242 | ||
a2fe8166 HS |
243 | static int ieee80211_tx_radiotap_len(struct ieee80211_tx_info *info) |
244 | { | |
245 | int len = sizeof(struct ieee80211_radiotap_header); | |
246 | ||
247 | /* IEEE80211_RADIOTAP_RATE rate */ | |
248 | if (info->status.rates[0].idx >= 0 && | |
a8241310 KB |
249 | !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS | |
250 | IEEE80211_TX_RC_VHT_MCS))) | |
a2fe8166 HS |
251 | len += 2; |
252 | ||
253 | /* IEEE80211_RADIOTAP_TX_FLAGS */ | |
254 | len += 2; | |
255 | ||
256 | /* IEEE80211_RADIOTAP_DATA_RETRIES */ | |
257 | len += 1; | |
258 | ||
a8241310 KB |
259 | /* IEEE80211_RADIOTAP_MCS |
260 | * IEEE80211_RADIOTAP_VHT */ | |
261 | if (info->status.rates[0].idx >= 0) { | |
262 | if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS) | |
263 | len += 3; | |
264 | else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS) | |
265 | len = ALIGN(len, 2) + 12; | |
266 | } | |
7f2a5e21 | 267 | |
a2fe8166 HS |
268 | return len; |
269 | } | |
270 | ||
2103dec1 | 271 | static void |
a8241310 KB |
272 | ieee80211_add_tx_radiotap_header(struct ieee80211_local *local, |
273 | struct ieee80211_supported_band *sband, | |
2103dec1 SW |
274 | struct sk_buff *skb, int retry_count, |
275 | int rtap_len, int shift) | |
a2fe8166 HS |
276 | { |
277 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
278 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
279 | struct ieee80211_radiotap_header *rthdr; | |
280 | unsigned char *pos; | |
9c8f2c42 | 281 | u16 txflags; |
a2fe8166 HS |
282 | |
283 | rthdr = (struct ieee80211_radiotap_header *) skb_push(skb, rtap_len); | |
284 | ||
285 | memset(rthdr, 0, rtap_len); | |
286 | rthdr->it_len = cpu_to_le16(rtap_len); | |
287 | rthdr->it_present = | |
288 | cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) | | |
289 | (1 << IEEE80211_RADIOTAP_DATA_RETRIES)); | |
290 | pos = (unsigned char *)(rthdr + 1); | |
291 | ||
292 | /* | |
293 | * XXX: Once radiotap gets the bitmap reset thing the vendor | |
294 | * extensions proposal contains, we can actually report | |
295 | * the whole set of tries we did. | |
296 | */ | |
297 | ||
298 | /* IEEE80211_RADIOTAP_RATE */ | |
299 | if (info->status.rates[0].idx >= 0 && | |
a8241310 KB |
300 | !(info->status.rates[0].flags & (IEEE80211_TX_RC_MCS | |
301 | IEEE80211_TX_RC_VHT_MCS))) { | |
2103dec1 SW |
302 | u16 rate; |
303 | ||
a2fe8166 | 304 | rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); |
2103dec1 SW |
305 | rate = sband->bitrates[info->status.rates[0].idx].bitrate; |
306 | *pos = DIV_ROUND_UP(rate, 5 * (1 << shift)); | |
a2fe8166 HS |
307 | /* padding for tx flags */ |
308 | pos += 2; | |
309 | } | |
310 | ||
311 | /* IEEE80211_RADIOTAP_TX_FLAGS */ | |
312 | txflags = 0; | |
313 | if (!(info->flags & IEEE80211_TX_STAT_ACK) && | |
314 | !is_multicast_ether_addr(hdr->addr1)) | |
9c8f2c42 | 315 | txflags |= IEEE80211_RADIOTAP_F_TX_FAIL; |
a2fe8166 | 316 | |
311ab8e1 | 317 | if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT) |
9c8f2c42 | 318 | txflags |= IEEE80211_RADIOTAP_F_TX_CTS; |
311ab8e1 | 319 | if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) |
9c8f2c42 | 320 | txflags |= IEEE80211_RADIOTAP_F_TX_RTS; |
a2fe8166 HS |
321 | |
322 | put_unaligned_le16(txflags, pos); | |
323 | pos += 2; | |
324 | ||
325 | /* IEEE80211_RADIOTAP_DATA_RETRIES */ | |
326 | /* for now report the total retry_count */ | |
327 | *pos = retry_count; | |
328 | pos++; | |
7f2a5e21 | 329 | |
a8241310 KB |
330 | if (info->status.rates[0].idx < 0) |
331 | return; | |
332 | ||
333 | /* IEEE80211_RADIOTAP_MCS | |
334 | * IEEE80211_RADIOTAP_VHT */ | |
335 | if (info->status.rates[0].flags & IEEE80211_TX_RC_MCS) { | |
7f2a5e21 HS |
336 | rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS); |
337 | pos[0] = IEEE80211_RADIOTAP_MCS_HAVE_MCS | | |
338 | IEEE80211_RADIOTAP_MCS_HAVE_GI | | |
339 | IEEE80211_RADIOTAP_MCS_HAVE_BW; | |
340 | if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI) | |
341 | pos[1] |= IEEE80211_RADIOTAP_MCS_SGI; | |
342 | if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH) | |
343 | pos[1] |= IEEE80211_RADIOTAP_MCS_BW_40; | |
344 | if (info->status.rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD) | |
345 | pos[1] |= IEEE80211_RADIOTAP_MCS_FMT_GF; | |
346 | pos[2] = info->status.rates[0].idx; | |
347 | pos += 3; | |
a8241310 KB |
348 | } else if (info->status.rates[0].flags & IEEE80211_TX_RC_VHT_MCS) { |
349 | u16 known = local->hw.radiotap_vht_details & | |
350 | (IEEE80211_RADIOTAP_VHT_KNOWN_GI | | |
351 | IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH); | |
352 | ||
353 | rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT); | |
354 | ||
355 | /* required alignment from rthdr */ | |
356 | pos = (u8 *)rthdr + ALIGN(pos - (u8 *)rthdr, 2); | |
7f2a5e21 | 357 | |
a8241310 KB |
358 | /* u16 known - IEEE80211_RADIOTAP_VHT_KNOWN_* */ |
359 | put_unaligned_le16(known, pos); | |
360 | pos += 2; | |
361 | ||
362 | /* u8 flags - IEEE80211_RADIOTAP_VHT_FLAG_* */ | |
363 | if (info->status.rates[0].flags & IEEE80211_TX_RC_SHORT_GI) | |
364 | *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI; | |
365 | pos++; | |
366 | ||
367 | /* u8 bandwidth */ | |
368 | if (info->status.rates[0].flags & IEEE80211_TX_RC_40_MHZ_WIDTH) | |
369 | *pos = 1; | |
370 | else if (info->status.rates[0].flags & IEEE80211_TX_RC_80_MHZ_WIDTH) | |
371 | *pos = 4; | |
372 | else if (info->status.rates[0].flags & IEEE80211_TX_RC_160_MHZ_WIDTH) | |
373 | *pos = 11; | |
374 | else /* IEEE80211_TX_RC_{20_MHZ_WIDTH,FIXME:DUP_DATA} */ | |
375 | *pos = 0; | |
376 | pos++; | |
377 | ||
378 | /* u8 mcs_nss[4] */ | |
379 | *pos = (ieee80211_rate_get_vht_mcs(&info->status.rates[0]) << 4) | | |
380 | ieee80211_rate_get_vht_nss(&info->status.rates[0]); | |
381 | pos += 4; | |
382 | ||
383 | /* u8 coding */ | |
384 | pos++; | |
385 | /* u8 group_id */ | |
386 | pos++; | |
387 | /* u16 partial_aid */ | |
388 | pos += 2; | |
389 | } | |
a2fe8166 HS |
390 | } |
391 | ||
8a2fbedc JB |
392 | static void ieee80211_report_used_skb(struct ieee80211_local *local, |
393 | struct sk_buff *skb, bool dropped) | |
394 | { | |
395 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
396 | struct ieee80211_hdr *hdr = (void *)skb->data; | |
397 | bool acked = info->flags & IEEE80211_TX_STAT_ACK; | |
398 | ||
399 | if (dropped) | |
400 | acked = false; | |
401 | ||
1672c0e3 JB |
402 | if (info->flags & (IEEE80211_TX_INTFL_NL80211_FRAME_TX | |
403 | IEEE80211_TX_INTFL_MLME_CONN_TX)) { | |
8a2fbedc JB |
404 | struct ieee80211_sub_if_data *sdata = NULL; |
405 | struct ieee80211_sub_if_data *iter_sdata; | |
406 | u64 cookie = (unsigned long)skb; | |
407 | ||
408 | rcu_read_lock(); | |
409 | ||
410 | if (skb->dev) { | |
411 | list_for_each_entry_rcu(iter_sdata, &local->interfaces, | |
412 | list) { | |
413 | if (!iter_sdata->dev) | |
414 | continue; | |
415 | ||
416 | if (skb->dev == iter_sdata->dev) { | |
417 | sdata = iter_sdata; | |
418 | break; | |
419 | } | |
420 | } | |
421 | } else { | |
422 | sdata = rcu_dereference(local->p2p_sdata); | |
423 | } | |
424 | ||
1672c0e3 | 425 | if (!sdata) { |
8a2fbedc | 426 | skb->dev = NULL; |
1672c0e3 JB |
427 | } else if (info->flags & IEEE80211_TX_INTFL_MLME_CONN_TX) { |
428 | ieee80211_mgd_conn_tx_status(sdata, hdr->frame_control, | |
429 | acked); | |
430 | } else if (ieee80211_is_nullfunc(hdr->frame_control) || | |
431 | ieee80211_is_qos_nullfunc(hdr->frame_control)) { | |
8a2fbedc JB |
432 | cfg80211_probe_status(sdata->dev, hdr->addr1, |
433 | cookie, acked, GFP_ATOMIC); | |
434 | } else { | |
435 | cfg80211_mgmt_tx_status(&sdata->wdev, cookie, skb->data, | |
436 | skb->len, acked, GFP_ATOMIC); | |
437 | } | |
438 | ||
439 | rcu_read_unlock(); | |
440 | } | |
441 | ||
442 | if (unlikely(info->ack_frame_id)) { | |
443 | struct sk_buff *ack_skb; | |
444 | unsigned long flags; | |
445 | ||
446 | spin_lock_irqsave(&local->ack_status_lock, flags); | |
447 | ack_skb = idr_find(&local->ack_status_frames, | |
448 | info->ack_frame_id); | |
449 | if (ack_skb) | |
450 | idr_remove(&local->ack_status_frames, | |
451 | info->ack_frame_id); | |
452 | spin_unlock_irqrestore(&local->ack_status_lock, flags); | |
453 | ||
454 | if (ack_skb) { | |
455 | if (!dropped) { | |
456 | /* consumes ack_skb */ | |
457 | skb_complete_wifi_ack(ack_skb, acked); | |
458 | } else { | |
459 | dev_kfree_skb_any(ack_skb); | |
460 | } | |
461 | } | |
462 | } | |
463 | } | |
464 | ||
ad38bfc9 MG |
465 | /* |
466 | * Measure Tx frame completion and removal time for Tx latency statistics | |
467 | * calculation. A single Tx frame latency should be measured from when it | |
468 | * is entering the Kernel until we receive Tx complete confirmation indication | |
469 | * and remove the skb. | |
470 | */ | |
471 | static void ieee80211_tx_latency_end_msrmnt(struct ieee80211_local *local, | |
472 | struct sk_buff *skb, | |
473 | struct sta_info *sta, | |
474 | struct ieee80211_hdr *hdr) | |
475 | { | |
476 | ktime_t skb_dprt; | |
477 | struct timespec dprt_time; | |
478 | u32 msrmnt; | |
479 | u16 tid; | |
480 | u8 *qc; | |
953467d3 | 481 | int i, bin_range_count; |
ad38bfc9 MG |
482 | u32 *bin_ranges; |
483 | __le16 fc; | |
484 | struct ieee80211_tx_latency_stat *tx_lat; | |
485 | struct ieee80211_tx_latency_bin_ranges *tx_latency; | |
486 | ktime_t skb_arv = skb->tstamp; | |
487 | ||
488 | tx_latency = rcu_dereference(local->tx_latency); | |
489 | ||
490 | /* assert Tx latency stats are enabled & frame arrived when enabled */ | |
491 | if (!tx_latency || !ktime_to_ns(skb_arv)) | |
492 | return; | |
493 | ||
494 | fc = hdr->frame_control; | |
495 | ||
496 | if (!ieee80211_is_data(fc)) /* make sure it is a data frame */ | |
497 | return; | |
498 | ||
499 | /* get frame tid */ | |
500 | if (ieee80211_is_data_qos(hdr->frame_control)) { | |
501 | qc = ieee80211_get_qos_ctl(hdr); | |
502 | tid = qc[0] & IEEE80211_QOS_CTL_TID_MASK; | |
503 | } else { | |
504 | tid = 0; | |
505 | } | |
506 | ||
507 | tx_lat = &sta->tx_lat[tid]; | |
508 | ||
509 | ktime_get_ts(&dprt_time); /* time stamp completion time */ | |
510 | skb_dprt = ktime_set(dprt_time.tv_sec, dprt_time.tv_nsec); | |
511 | msrmnt = ktime_to_ms(ktime_sub(skb_dprt, skb_arv)); | |
512 | ||
513 | if (tx_lat->max < msrmnt) /* update stats */ | |
514 | tx_lat->max = msrmnt; | |
515 | tx_lat->counter++; | |
516 | tx_lat->sum += msrmnt; | |
517 | ||
518 | if (!tx_lat->bins) /* bins not activated */ | |
519 | return; | |
520 | ||
521 | /* count how many Tx frames transmitted with the appropriate latency */ | |
522 | bin_range_count = tx_latency->n_ranges; | |
523 | bin_ranges = tx_latency->ranges; | |
ad38bfc9 MG |
524 | |
525 | for (i = 0; i < bin_range_count; i++) { | |
526 | if (msrmnt <= bin_ranges[i]) { | |
527 | tx_lat->bins[i]++; | |
528 | break; | |
529 | } | |
530 | } | |
531 | if (i == bin_range_count) /* msrmnt is bigger than the biggest range */ | |
532 | tx_lat->bins[i]++; | |
533 | } | |
534 | ||
99ba2a14 JB |
535 | /* |
536 | * Use a static threshold for now, best value to be determined | |
537 | * by testing ... | |
538 | * Should it depend on: | |
539 | * - on # of retransmissions | |
540 | * - current throughput (higher value for higher tpt)? | |
541 | */ | |
542 | #define STA_LOST_PKT_THRESHOLD 50 | |
543 | ||
abd43a6a FF |
544 | static void ieee80211_lost_packet(struct sta_info *sta, struct sk_buff *skb) |
545 | { | |
546 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
547 | ||
548 | /* This packet was aggregated but doesn't carry status info */ | |
549 | if ((info->flags & IEEE80211_TX_CTL_AMPDU) && | |
550 | !(info->flags & IEEE80211_TX_STAT_AMPDU)) | |
551 | return; | |
552 | ||
553 | if (++sta->lost_packets < STA_LOST_PKT_THRESHOLD) | |
554 | return; | |
555 | ||
556 | cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr, | |
557 | sta->lost_packets, GFP_ATOMIC); | |
558 | sta->lost_packets = 0; | |
559 | } | |
560 | ||
fe7a5d5c JB |
561 | void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb) |
562 | { | |
563 | struct sk_buff *skb2; | |
564 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
565 | struct ieee80211_local *local = hw_to_local(hw); | |
566 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
fe7a5d5c JB |
567 | __le16 fc; |
568 | struct ieee80211_supported_band *sband; | |
fe7a5d5c JB |
569 | struct ieee80211_sub_if_data *sdata; |
570 | struct net_device *prev_dev = NULL; | |
abe60632 | 571 | struct sta_info *sta, *tmp; |
fe7a5d5c | 572 | int retry_count = -1, i; |
0c869808 | 573 | int rates_idx = -1; |
eaf55530 | 574 | bool send_to_cooked; |
04ac3c0e | 575 | bool acked; |
e69deded | 576 | struct ieee80211_bar *bar; |
a2fe8166 | 577 | int rtap_len; |
2103dec1 | 578 | int shift = 0; |
fe7a5d5c JB |
579 | |
580 | for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { | |
d01b3160 LB |
581 | if ((info->flags & IEEE80211_TX_CTL_AMPDU) && |
582 | !(info->flags & IEEE80211_TX_STAT_AMPDU)) { | |
583 | /* just the first aggr frame carry status info */ | |
584 | info->status.rates[i].idx = -1; | |
585 | info->status.rates[i].count = 0; | |
586 | break; | |
587 | } else if (info->status.rates[i].idx < 0) { | |
be7974aa HS |
588 | break; |
589 | } else if (i >= hw->max_report_rates) { | |
590 | /* the HW cannot have attempted that rate */ | |
fe7a5d5c JB |
591 | info->status.rates[i].idx = -1; |
592 | info->status.rates[i].count = 0; | |
be7974aa | 593 | break; |
fe7a5d5c JB |
594 | } |
595 | ||
596 | retry_count += info->status.rates[i].count; | |
597 | } | |
be7974aa HS |
598 | rates_idx = i - 1; |
599 | ||
fe7a5d5c JB |
600 | if (retry_count < 0) |
601 | retry_count = 0; | |
602 | ||
603 | rcu_read_lock(); | |
604 | ||
605 | sband = local->hw.wiphy->bands[info->band]; | |
375177bf | 606 | fc = hdr->frame_control; |
fe7a5d5c | 607 | |
abe60632 JB |
608 | for_each_sta_info(local, hdr->addr1, sta, tmp) { |
609 | /* skip wrong virtual interface */ | |
b203ca39 | 610 | if (!ether_addr_equal(hdr->addr2, sta->sdata->vif.addr)) |
abe60632 | 611 | continue; |
fe7a5d5c | 612 | |
2103dec1 SW |
613 | shift = ieee80211_vif_get_shift(&sta->sdata->vif); |
614 | ||
47086fc5 | 615 | if (info->flags & IEEE80211_TX_STATUS_EOSP) |
c2c98fde | 616 | clear_sta_flag(sta, WLAN_STA_SP); |
47086fc5 | 617 | |
04ac3c0e | 618 | acked = !!(info->flags & IEEE80211_TX_STAT_ACK); |
c2c98fde | 619 | if (!acked && test_sta_flag(sta, WLAN_STA_PS_STA)) { |
fe7a5d5c JB |
620 | /* |
621 | * The STA is in power save mode, so assume | |
622 | * that this TX packet failed because of that. | |
623 | */ | |
624 | ieee80211_handle_filtered_frame(local, sta, skb); | |
625 | rcu_read_unlock(); | |
626 | return; | |
627 | } | |
628 | ||
3f52b7e3 MP |
629 | /* mesh Peer Service Period support */ |
630 | if (ieee80211_vif_is_mesh(&sta->sdata->vif) && | |
631 | ieee80211_is_data_qos(fc)) | |
632 | ieee80211_mpsp_trigger_process( | |
633 | ieee80211_get_qos_ctl(hdr), | |
634 | sta, true, acked); | |
635 | ||
0c869808 | 636 | if ((local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) && |
00a9a6d1 | 637 | (ieee80211_is_data(hdr->frame_control)) && |
0c869808 JO |
638 | (rates_idx != -1)) |
639 | sta->last_tx_rate = info->status.rates[rates_idx]; | |
640 | ||
fe7a5d5c JB |
641 | if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) && |
642 | (ieee80211_is_data_qos(fc))) { | |
643 | u16 tid, ssn; | |
644 | u8 *qc; | |
645 | ||
646 | qc = ieee80211_get_qos_ctl(hdr); | |
647 | tid = qc[0] & 0xf; | |
648 | ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10) | |
649 | & IEEE80211_SCTL_SEQ); | |
8c771244 | 650 | ieee80211_send_bar(&sta->sdata->vif, hdr->addr1, |
fe7a5d5c JB |
651 | tid, ssn); |
652 | } | |
653 | ||
e69deded | 654 | if (!acked && ieee80211_is_back_req(fc)) { |
8e7c4e4d | 655 | u16 tid, control; |
7107676a | 656 | |
e69deded | 657 | /* |
7107676a FF |
658 | * BAR failed, store the last SSN and retry sending |
659 | * the BAR when the next unicast transmission on the | |
660 | * same TID succeeds. | |
e69deded HS |
661 | */ |
662 | bar = (struct ieee80211_bar *) skb->data; | |
7107676a FF |
663 | control = le16_to_cpu(bar->control); |
664 | if (!(control & IEEE80211_BAR_CTRL_MULTI_TID)) { | |
f0425bed FF |
665 | u16 ssn = le16_to_cpu(bar->start_seq_num); |
666 | ||
7107676a | 667 | tid = (control & |
e69deded HS |
668 | IEEE80211_BAR_CTRL_TID_INFO_MASK) >> |
669 | IEEE80211_BAR_CTRL_TID_INFO_SHIFT; | |
f0425bed | 670 | |
8df6b7b1 | 671 | ieee80211_set_bar_pending(sta, tid, ssn); |
e69deded HS |
672 | } |
673 | } | |
674 | ||
fe7a5d5c JB |
675 | if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) { |
676 | ieee80211_handle_filtered_frame(local, sta, skb); | |
677 | rcu_read_unlock(); | |
678 | return; | |
679 | } else { | |
04ac3c0e | 680 | if (!acked) |
fe7a5d5c JB |
681 | sta->tx_retry_failed++; |
682 | sta->tx_retry_count += retry_count; | |
683 | } | |
684 | ||
685 | rate_control_tx_status(local, sband, sta, skb); | |
686 | if (ieee80211_vif_is_mesh(&sta->sdata->vif)) | |
687 | ieee80211s_update_metric(local, sta, skb); | |
0f78231b | 688 | |
04ac3c0e | 689 | if (!(info->flags & IEEE80211_TX_CTL_INJECTED) && acked) |
0f78231b | 690 | ieee80211_frame_acked(sta, skb); |
99ba2a14 | 691 | |
04ac3c0e FF |
692 | if ((sta->sdata->vif.type == NL80211_IFTYPE_STATION) && |
693 | (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) | |
694 | ieee80211_sta_tx_notify(sta->sdata, (void *) skb->data, acked); | |
695 | ||
99ba2a14 JB |
696 | if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) { |
697 | if (info->flags & IEEE80211_TX_STAT_ACK) { | |
698 | if (sta->lost_packets) | |
699 | sta->lost_packets = 0; | |
abd43a6a FF |
700 | } else { |
701 | ieee80211_lost_packet(sta, skb); | |
99ba2a14 JB |
702 | } |
703 | } | |
db94357d S |
704 | |
705 | if (acked) | |
706 | sta->last_ack_signal = info->status.ack_signal; | |
ad38bfc9 MG |
707 | |
708 | /* | |
709 | * Measure frame removal for tx latency | |
710 | * statistics calculation | |
711 | */ | |
712 | ieee80211_tx_latency_end_msrmnt(local, skb, sta, hdr); | |
fe7a5d5c JB |
713 | } |
714 | ||
715 | rcu_read_unlock(); | |
716 | ||
e47f2509 | 717 | ieee80211_led_tx(local); |
fe7a5d5c JB |
718 | |
719 | /* SNMP counters | |
720 | * Fragments are passed to low-level drivers as separate skbs, so these | |
721 | * are actually fragments, not frames. Update frame counters only for | |
722 | * the first fragment of the frame. */ | |
fe7a5d5c | 723 | if (info->flags & IEEE80211_TX_STAT_ACK) { |
adf5ace5 | 724 | if (ieee80211_is_first_frag(hdr->seq_ctrl)) { |
fe7a5d5c JB |
725 | local->dot11TransmittedFrameCount++; |
726 | if (is_multicast_ether_addr(hdr->addr1)) | |
727 | local->dot11MulticastTransmittedFrameCount++; | |
728 | if (retry_count > 0) | |
729 | local->dot11RetryCount++; | |
730 | if (retry_count > 1) | |
731 | local->dot11MultipleRetryCount++; | |
732 | } | |
733 | ||
734 | /* This counter shall be incremented for an acknowledged MPDU | |
735 | * with an individual address in the address 1 field or an MPDU | |
736 | * with a multicast address in the address 1 field of type Data | |
737 | * or Management. */ | |
738 | if (!is_multicast_ether_addr(hdr->addr1) || | |
adf5ace5 HS |
739 | ieee80211_is_data(fc) || |
740 | ieee80211_is_mgmt(fc)) | |
fe7a5d5c JB |
741 | local->dot11TransmittedFragmentCount++; |
742 | } else { | |
adf5ace5 | 743 | if (ieee80211_is_first_frag(hdr->seq_ctrl)) |
fe7a5d5c JB |
744 | local->dot11FailedCount++; |
745 | } | |
746 | ||
375177bf VN |
747 | if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) && |
748 | (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) && | |
749 | !(info->flags & IEEE80211_TX_CTL_INJECTED) && | |
750 | local->ps_sdata && !(local->scanning)) { | |
751 | if (info->flags & IEEE80211_TX_STAT_ACK) { | |
752 | local->ps_sdata->u.mgd.flags |= | |
753 | IEEE80211_STA_NULLFUNC_ACKED; | |
375177bf VN |
754 | } else |
755 | mod_timer(&local->dynamic_ps_timer, jiffies + | |
756 | msecs_to_jiffies(10)); | |
757 | } | |
758 | ||
8a2fbedc | 759 | ieee80211_report_used_skb(local, skb, false); |
a729cff8 | 760 | |
fe7a5d5c JB |
761 | /* this was a transmitted frame, but now we want to reuse it */ |
762 | skb_orphan(skb); | |
763 | ||
eaf55530 FF |
764 | /* Need to make a copy before skb->cb gets cleared */ |
765 | send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) || | |
adf5ace5 | 766 | !(ieee80211_is_data(fc)); |
eaf55530 | 767 | |
fe7a5d5c JB |
768 | /* |
769 | * This is a bit racy but we can avoid a lot of work | |
770 | * with this test... | |
771 | */ | |
eaf55530 | 772 | if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) { |
fe7a5d5c JB |
773 | dev_kfree_skb(skb); |
774 | return; | |
775 | } | |
776 | ||
777 | /* send frame to monitor interfaces now */ | |
a2fe8166 HS |
778 | rtap_len = ieee80211_tx_radiotap_len(info); |
779 | if (WARN_ON_ONCE(skb_headroom(skb) < rtap_len)) { | |
f0d23208 | 780 | pr_err("ieee80211_tx_status: headroom too small\n"); |
fe7a5d5c JB |
781 | dev_kfree_skb(skb); |
782 | return; | |
783 | } | |
a8241310 KB |
784 | ieee80211_add_tx_radiotap_header(local, sband, skb, retry_count, |
785 | rtap_len, shift); | |
fe7a5d5c JB |
786 | |
787 | /* XXX: is this sufficient for BPF? */ | |
788 | skb_set_mac_header(skb, 0); | |
789 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
790 | skb->pkt_type = PACKET_OTHERHOST; | |
791 | skb->protocol = htons(ETH_P_802_2); | |
792 | memset(skb->cb, 0, sizeof(skb->cb)); | |
793 | ||
794 | rcu_read_lock(); | |
795 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { | |
796 | if (sdata->vif.type == NL80211_IFTYPE_MONITOR) { | |
9607e6b6 | 797 | if (!ieee80211_sdata_running(sdata)) |
fe7a5d5c JB |
798 | continue; |
799 | ||
800 | if ((sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) && | |
eaf55530 | 801 | !send_to_cooked) |
fe7a5d5c JB |
802 | continue; |
803 | ||
804 | if (prev_dev) { | |
805 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
806 | if (skb2) { | |
807 | skb2->dev = prev_dev; | |
4efe7f51 | 808 | netif_rx(skb2); |
fe7a5d5c JB |
809 | } |
810 | } | |
811 | ||
812 | prev_dev = sdata->dev; | |
813 | } | |
814 | } | |
815 | if (prev_dev) { | |
816 | skb->dev = prev_dev; | |
4efe7f51 | 817 | netif_rx(skb); |
fe7a5d5c JB |
818 | skb = NULL; |
819 | } | |
820 | rcu_read_unlock(); | |
821 | dev_kfree_skb(skb); | |
822 | } | |
823 | EXPORT_SYMBOL(ieee80211_tx_status); | |
8178d38b AN |
824 | |
825 | void ieee80211_report_low_ack(struct ieee80211_sta *pubsta, u32 num_packets) | |
826 | { | |
827 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); | |
828 | cfg80211_cqm_pktloss_notify(sta->sdata->dev, sta->sta.addr, | |
829 | num_packets, GFP_ATOMIC); | |
830 | } | |
831 | EXPORT_SYMBOL(ieee80211_report_low_ack); | |
6096de7f JB |
832 | |
833 | void ieee80211_free_txskb(struct ieee80211_hw *hw, struct sk_buff *skb) | |
834 | { | |
a729cff8 | 835 | struct ieee80211_local *local = hw_to_local(hw); |
a729cff8 | 836 | |
8a2fbedc | 837 | ieee80211_report_used_skb(local, skb, true); |
6096de7f JB |
838 | dev_kfree_skb_any(skb); |
839 | } | |
840 | EXPORT_SYMBOL(ieee80211_free_txskb); | |
1f98ab7f FF |
841 | |
842 | void ieee80211_purge_tx_queue(struct ieee80211_hw *hw, | |
843 | struct sk_buff_head *skbs) | |
844 | { | |
845 | struct sk_buff *skb; | |
846 | ||
847 | while ((skb = __skb_dequeue(skbs))) | |
848 | ieee80211_free_txskb(hw, skb); | |
849 | } |