2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2008-2010 Johannes Berg <johannes@sipsolutions.net>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 #include <net/mac80211.h>
13 #include "ieee80211_i.h"
19 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
22 struct ieee80211_local *local = hw_to_local(hw);
23 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
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);
35 I802_DEBUG_INC(local->tx_status_drop);
37 tasklet_schedule(&local->tasklet);
39 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
41 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
45 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
48 * This skb 'survived' a round-trip through the driver, and
49 * hopefully the driver didn't mangle it too badly. However,
50 * we can definitely not rely on the control information
51 * 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.
55 memset(&info->control, 0, sizeof(info->control));
57 info->control.jiffies = jiffies;
58 info->control.vif = &sta->sdata->vif;
59 info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING |
60 IEEE80211_TX_INTFL_RETRANSMISSION;
61 info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
63 sta->tx_filtered_count++;
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.
70 set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
73 * This code races in the following way:
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.
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.
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.
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
98 * (b) always process RX events before TX status events if ordering
99 * can be unknown, for example with different interrupt status
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);
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);
116 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
118 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
119 "queue_len=%d PS=%d @%lu\n",
120 wiphy_name(local->hw.wiphy),
121 skb_queue_len(&sta->tx_filtered),
122 !!test_sta_flags(sta, WLAN_STA_PS_STA), jiffies);
127 static void ieee80211_frame_acked(struct sta_info *sta, struct sk_buff *skb)
129 struct ieee80211_mgmt *mgmt = (void *) skb->data;
130 struct ieee80211_local *local = sta->local;
131 struct ieee80211_sub_if_data *sdata = sta->sdata;
133 if (ieee80211_is_action(mgmt->frame_control) &&
134 sdata->vif.type == NL80211_IFTYPE_STATION &&
135 mgmt->u.action.category == WLAN_CATEGORY_HT &&
136 mgmt->u.action.u.ht_smps.action == WLAN_HT_ACTION_SMPS) {
138 * This update looks racy, but isn't -- if we come
139 * here we've definitely got a station that we're
140 * talking to, and on a managed interface that can
141 * only be the AP. And the only other place updating
142 * this variable is before we're associated.
144 switch (mgmt->u.action.u.ht_smps.smps_control) {
145 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
146 sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_DYNAMIC;
148 case WLAN_HT_SMPS_CONTROL_STATIC:
149 sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_STATIC;
151 case WLAN_HT_SMPS_CONTROL_DISABLED:
152 default: /* shouldn't happen since we don't send that */
153 sta->sdata->u.mgd.ap_smps = IEEE80211_SMPS_OFF;
157 ieee80211_queue_work(&local->hw, &local->recalc_smps);
161 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
163 struct sk_buff *skb2;
164 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
165 struct ieee80211_local *local = hw_to_local(hw);
166 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
169 struct ieee80211_supported_band *sband;
170 struct ieee80211_tx_status_rtap_hdr *rthdr;
171 struct ieee80211_sub_if_data *sdata;
172 struct net_device *prev_dev = NULL;
173 struct sta_info *sta, *tmp;
174 int retry_count = -1, i;
178 for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
179 /* the HW cannot have attempted that rate */
180 if (i >= hw->max_rates) {
181 info->status.rates[i].idx = -1;
182 info->status.rates[i].count = 0;
183 } else if (info->status.rates[i].idx >= 0) {
187 retry_count += info->status.rates[i].count;
194 sband = local->hw.wiphy->bands[info->band];
195 fc = hdr->frame_control;
197 for_each_sta_info(local, hdr->addr1, sta, tmp) {
198 /* skip wrong virtual interface */
199 if (memcmp(hdr->addr2, sta->sdata->vif.addr, ETH_ALEN))
202 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
203 test_sta_flags(sta, WLAN_STA_PS_STA)) {
205 * The STA is in power save mode, so assume
206 * that this TX packet failed because of that.
208 ieee80211_handle_filtered_frame(local, sta, skb);
213 if ((local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) &&
215 sta->last_tx_rate = info->status.rates[rates_idx];
217 if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
218 (ieee80211_is_data_qos(fc))) {
222 qc = ieee80211_get_qos_ctl(hdr);
224 ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
225 & IEEE80211_SCTL_SEQ);
226 ieee80211_send_bar(sta->sdata, hdr->addr1,
230 if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
231 ieee80211_handle_filtered_frame(local, sta, skb);
235 if (!(info->flags & IEEE80211_TX_STAT_ACK))
236 sta->tx_retry_failed++;
237 sta->tx_retry_count += retry_count;
240 rate_control_tx_status(local, sband, sta, skb);
241 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
242 ieee80211s_update_metric(local, sta, skb);
244 if (!(info->flags & IEEE80211_TX_CTL_INJECTED) &&
245 (info->flags & IEEE80211_TX_STAT_ACK))
246 ieee80211_frame_acked(sta, skb);
251 ieee80211_led_tx(local, 0);
254 * Fragments are passed to low-level drivers as separate skbs, so these
255 * are actually fragments, not frames. Update frame counters only for
256 * the first fragment of the frame. */
258 frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
259 type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
261 if (info->flags & IEEE80211_TX_STAT_ACK) {
263 local->dot11TransmittedFrameCount++;
264 if (is_multicast_ether_addr(hdr->addr1))
265 local->dot11MulticastTransmittedFrameCount++;
267 local->dot11RetryCount++;
269 local->dot11MultipleRetryCount++;
272 /* This counter shall be incremented for an acknowledged MPDU
273 * with an individual address in the address 1 field or an MPDU
274 * with a multicast address in the address 1 field of type Data
276 if (!is_multicast_ether_addr(hdr->addr1) ||
277 type == IEEE80211_FTYPE_DATA ||
278 type == IEEE80211_FTYPE_MGMT)
279 local->dot11TransmittedFragmentCount++;
282 local->dot11FailedCount++;
285 if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) &&
286 (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
287 !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
288 local->ps_sdata && !(local->scanning)) {
289 if (info->flags & IEEE80211_TX_STAT_ACK) {
290 local->ps_sdata->u.mgd.flags |=
291 IEEE80211_STA_NULLFUNC_ACKED;
292 ieee80211_queue_work(&local->hw,
293 &local->dynamic_ps_enable_work);
295 mod_timer(&local->dynamic_ps_timer, jiffies +
296 msecs_to_jiffies(10));
299 if (info->flags & IEEE80211_TX_INTFL_NL80211_FRAME_TX)
300 cfg80211_action_tx_status(
301 skb->dev, (unsigned long) skb, skb->data, skb->len,
302 !!(info->flags & IEEE80211_TX_STAT_ACK), GFP_ATOMIC);
304 /* this was a transmitted frame, but now we want to reuse it */
307 /* Need to make a copy before skb->cb gets cleared */
308 send_to_cooked = !!(info->flags & IEEE80211_TX_CTL_INJECTED) ||
309 (type != IEEE80211_FTYPE_DATA);
312 * This is a bit racy but we can avoid a lot of work
315 if (!local->monitors && (!send_to_cooked || !local->cooked_mntrs)) {
320 /* send frame to monitor interfaces now */
322 if (skb_headroom(skb) < sizeof(*rthdr)) {
323 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
328 rthdr = (struct ieee80211_tx_status_rtap_hdr *)
329 skb_push(skb, sizeof(*rthdr));
331 memset(rthdr, 0, sizeof(*rthdr));
332 rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
333 rthdr->hdr.it_present =
334 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
335 (1 << IEEE80211_RADIOTAP_DATA_RETRIES) |
336 (1 << IEEE80211_RADIOTAP_RATE));
338 if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
339 !is_multicast_ether_addr(hdr->addr1))
340 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
343 * XXX: Once radiotap gets the bitmap reset thing the vendor
344 * extensions proposal contains, we can actually report
345 * the whole set of tries we did.
347 if ((info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) ||
348 (info->status.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
349 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
350 else if (info->status.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)
351 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
352 if (info->status.rates[0].idx >= 0 &&
353 !(info->status.rates[0].flags & IEEE80211_TX_RC_MCS))
354 rthdr->rate = sband->bitrates[
355 info->status.rates[0].idx].bitrate / 5;
357 /* for now report the total retry_count */
358 rthdr->data_retries = retry_count;
360 /* XXX: is this sufficient for BPF? */
361 skb_set_mac_header(skb, 0);
362 skb->ip_summed = CHECKSUM_UNNECESSARY;
363 skb->pkt_type = PACKET_OTHERHOST;
364 skb->protocol = htons(ETH_P_802_2);
365 memset(skb->cb, 0, sizeof(skb->cb));
368 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
369 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
370 if (!ieee80211_sdata_running(sdata))
373 if ((sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) &&
378 skb2 = skb_clone(skb, GFP_ATOMIC);
380 skb2->dev = prev_dev;
385 prev_dev = sdata->dev;
396 EXPORT_SYMBOL(ieee80211_tx_status);