4 * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
5 * Copyright 2002-2005, Instant802 Networks, Inc.
6 * Copyright 2005-2006, Devicescape Software, Inc.
7 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
8 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
9 * Copyright 2007-2008, Intel Corporation
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
16 #include <linux/ieee80211.h>
17 #include <net/wireless.h>
18 #include <net/mac80211.h>
19 #include "ieee80211_i.h"
23 int ieee80211_ht_cap_ie_to_ht_info(struct ieee80211_ht_cap *ht_cap_ie,
24 struct ieee80211_ht_info *ht_info)
30 memset(ht_info, 0, sizeof(*ht_info));
33 u8 ampdu_info = ht_cap_ie->ampdu_params_info;
35 ht_info->ht_supported = 1;
36 ht_info->cap = le16_to_cpu(ht_cap_ie->cap_info);
37 ht_info->ampdu_factor =
38 ampdu_info & IEEE80211_HT_CAP_AMPDU_FACTOR;
39 ht_info->ampdu_density =
40 (ampdu_info & IEEE80211_HT_CAP_AMPDU_DENSITY) >> 2;
41 memcpy(ht_info->supp_mcs_set, ht_cap_ie->supp_mcs_set, 16);
43 ht_info->ht_supported = 0;
48 int ieee80211_ht_addt_info_ie_to_ht_bss_info(
49 struct ieee80211_ht_addt_info *ht_add_info_ie,
50 struct ieee80211_ht_bss_info *bss_info)
55 memset(bss_info, 0, sizeof(*bss_info));
59 op_mode = le16_to_cpu(ht_add_info_ie->operation_mode);
61 bss_info->primary_channel = ht_add_info_ie->control_chan;
62 bss_info->bss_cap = ht_add_info_ie->ht_param;
63 bss_info->bss_op_mode = (u8)(op_mode & 0xff);
69 void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata, const u8 *da,
70 u16 tid, u8 dialog_token, u16 start_seq_num,
71 u16 agg_size, u16 timeout)
73 struct ieee80211_local *local = sdata->local;
74 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
76 struct ieee80211_mgmt *mgmt;
79 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
82 printk(KERN_ERR "%s: failed to allocate buffer "
83 "for addba request frame\n", sdata->dev->name);
86 skb_reserve(skb, local->hw.extra_tx_headroom);
87 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
89 memcpy(mgmt->da, da, ETH_ALEN);
90 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
91 if (sdata->vif.type == IEEE80211_IF_TYPE_AP)
92 memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
94 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
96 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
97 IEEE80211_STYPE_ACTION);
99 skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_req));
101 mgmt->u.action.category = WLAN_CATEGORY_BACK;
102 mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ;
104 mgmt->u.action.u.addba_req.dialog_token = dialog_token;
105 capab = (u16)(1 << 1); /* bit 1 aggregation policy */
106 capab |= (u16)(tid << 2); /* bit 5:2 TID number */
107 capab |= (u16)(agg_size << 6); /* bit 15:6 max size of aggergation */
109 mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab);
111 mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout);
112 mgmt->u.action.u.addba_req.start_seq_num =
113 cpu_to_le16(start_seq_num << 4);
115 ieee80211_sta_tx(sdata, skb, 0);
118 void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata, const u8 *da, u16 tid,
119 u16 initiator, u16 reason_code)
121 struct ieee80211_local *local = sdata->local;
122 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
124 struct ieee80211_mgmt *mgmt;
127 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
130 printk(KERN_ERR "%s: failed to allocate buffer "
131 "for delba frame\n", sdata->dev->name);
135 skb_reserve(skb, local->hw.extra_tx_headroom);
136 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
138 memcpy(mgmt->da, da, ETH_ALEN);
139 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
140 if (sdata->vif.type == IEEE80211_IF_TYPE_AP)
141 memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
143 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
144 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
145 IEEE80211_STYPE_ACTION);
147 skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
149 mgmt->u.action.category = WLAN_CATEGORY_BACK;
150 mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
151 params = (u16)(initiator << 11); /* bit 11 initiator */
152 params |= (u16)(tid << 12); /* bit 15:12 TID number */
154 mgmt->u.action.u.delba.params = cpu_to_le16(params);
155 mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
157 ieee80211_sta_tx(sdata, skb, 0);
160 void ieee80211_send_bar(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid, u16 ssn)
162 struct ieee80211_local *local = sdata->local;
164 struct ieee80211_bar *bar;
167 skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom);
169 printk(KERN_ERR "%s: failed to allocate buffer for "
170 "bar frame\n", sdata->dev->name);
173 skb_reserve(skb, local->hw.extra_tx_headroom);
174 bar = (struct ieee80211_bar *)skb_put(skb, sizeof(*bar));
175 memset(bar, 0, sizeof(*bar));
176 bar->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
177 IEEE80211_STYPE_BACK_REQ);
178 memcpy(bar->ra, ra, ETH_ALEN);
179 memcpy(bar->ta, sdata->dev->dev_addr, ETH_ALEN);
180 bar_control |= (u16)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL;
181 bar_control |= (u16)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA;
182 bar_control |= (u16)(tid << 12);
183 bar->control = cpu_to_le16(bar_control);
184 bar->start_seq_num = cpu_to_le16(ssn);
186 ieee80211_sta_tx(sdata, skb, 0);
189 void ieee80211_sta_stop_rx_ba_session(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid,
190 u16 initiator, u16 reason)
192 struct ieee80211_local *local = sdata->local;
193 struct ieee80211_hw *hw = &local->hw;
194 struct sta_info *sta;
196 DECLARE_MAC_BUF(mac);
200 sta = sta_info_get(local, ra);
206 /* check if TID is in operational state */
207 spin_lock_bh(&sta->lock);
208 if (sta->ampdu_mlme.tid_state_rx[tid]
209 != HT_AGG_STATE_OPERATIONAL) {
210 spin_unlock_bh(&sta->lock);
214 sta->ampdu_mlme.tid_state_rx[tid] =
215 HT_AGG_STATE_REQ_STOP_BA_MSK |
216 (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
217 spin_unlock_bh(&sta->lock);
219 /* stop HW Rx aggregation. ampdu_action existence
220 * already verified in session init so we add the BUG_ON */
221 BUG_ON(!local->ops->ampdu_action);
223 #ifdef CONFIG_MAC80211_HT_DEBUG
224 printk(KERN_DEBUG "Rx BA session stop requested for %s tid %u\n",
225 print_mac(mac, ra), tid);
226 #endif /* CONFIG_MAC80211_HT_DEBUG */
228 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_STOP,
231 printk(KERN_DEBUG "HW problem - can not stop rx "
232 "aggregation for tid %d\n", tid);
234 /* shutdown timer has not expired */
235 if (initiator != WLAN_BACK_TIMER)
236 del_timer_sync(&sta->ampdu_mlme.tid_rx[tid]->session_timer);
238 /* check if this is a self generated aggregation halt */
239 if (initiator == WLAN_BACK_RECIPIENT || initiator == WLAN_BACK_TIMER)
240 ieee80211_send_delba(sdata, ra, tid, 0, reason);
242 /* free the reordering buffer */
243 for (i = 0; i < sta->ampdu_mlme.tid_rx[tid]->buf_size; i++) {
244 if (sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]) {
245 /* release the reordered frames */
246 dev_kfree_skb(sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]);
247 sta->ampdu_mlme.tid_rx[tid]->stored_mpdu_num--;
248 sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i] = NULL;
252 kfree(sta->ampdu_mlme.tid_rx[tid]->reorder_buf);
253 kfree(sta->ampdu_mlme.tid_rx[tid]);
254 sta->ampdu_mlme.tid_rx[tid] = NULL;
255 sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_IDLE;
262 * After sending add Block Ack request we activated a timer until
263 * add Block Ack response will arrive from the recipient.
264 * If this timer expires sta_addba_resp_timer_expired will be executed.
266 void sta_addba_resp_timer_expired(unsigned long data)
268 /* not an elegant detour, but there is no choice as the timer passes
269 * only one argument, and both sta_info and TID are needed, so init
270 * flow in sta_info_create gives the TID as data, while the timer_to_id
271 * array gives the sta through container_of */
272 u16 tid = *(u8 *)data;
273 struct sta_info *temp_sta = container_of((void *)data,
274 struct sta_info, timer_to_tid[tid]);
276 struct ieee80211_local *local = temp_sta->local;
277 struct ieee80211_hw *hw = &local->hw;
278 struct sta_info *sta;
283 sta = sta_info_get(local, temp_sta->addr);
289 state = &sta->ampdu_mlme.tid_state_tx[tid];
290 /* check if the TID waits for addBA response */
291 spin_lock_bh(&sta->lock);
292 if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
293 spin_unlock_bh(&sta->lock);
294 *state = HT_AGG_STATE_IDLE;
295 #ifdef CONFIG_MAC80211_HT_DEBUG
296 printk(KERN_DEBUG "timer expired on tid %d but we are not "
297 "expecting addBA response there", tid);
299 goto timer_expired_exit;
302 #ifdef CONFIG_MAC80211_HT_DEBUG
303 printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid);
306 /* go through the state check in stop_BA_session */
307 *state = HT_AGG_STATE_OPERATIONAL;
308 spin_unlock_bh(&sta->lock);
309 ieee80211_stop_tx_ba_session(hw, temp_sta->addr, tid,
310 WLAN_BACK_INITIATOR);
316 void ieee80211_sta_tear_down_BA_sessions(struct ieee80211_sub_if_data *sdata, u8 *addr)
318 struct ieee80211_local *local = sdata->local;
321 for (i = 0; i < STA_TID_NUM; i++) {
322 ieee80211_stop_tx_ba_session(&local->hw, addr, i,
323 WLAN_BACK_INITIATOR);
324 ieee80211_sta_stop_rx_ba_session(sdata, addr, i,
326 WLAN_REASON_QSTA_LEAVE_QBSS);
330 int ieee80211_start_tx_ba_session(struct ieee80211_hw *hw, u8 *ra, u16 tid)
332 struct ieee80211_local *local = hw_to_local(hw);
333 struct sta_info *sta;
334 struct ieee80211_sub_if_data *sdata;
338 DECLARE_MAC_BUF(mac);
340 if (tid >= STA_TID_NUM)
343 #ifdef CONFIG_MAC80211_HT_DEBUG
344 printk(KERN_DEBUG "Open BA session requested for %s tid %u\n",
345 print_mac(mac, ra), tid);
346 #endif /* CONFIG_MAC80211_HT_DEBUG */
350 sta = sta_info_get(local, ra);
352 #ifdef CONFIG_MAC80211_HT_DEBUG
353 printk(KERN_DEBUG "Could not find the station\n");
359 spin_lock_bh(&sta->lock);
361 /* we have tried too many times, receiver does not want A-MPDU */
362 if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) {
367 state = &sta->ampdu_mlme.tid_state_tx[tid];
368 /* check if the TID is not in aggregation flow already */
369 if (*state != HT_AGG_STATE_IDLE) {
370 #ifdef CONFIG_MAC80211_HT_DEBUG
371 printk(KERN_DEBUG "BA request denied - session is not "
372 "idle on tid %u\n", tid);
373 #endif /* CONFIG_MAC80211_HT_DEBUG */
378 /* prepare A-MPDU MLME for Tx aggregation */
379 sta->ampdu_mlme.tid_tx[tid] =
380 kmalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
381 if (!sta->ampdu_mlme.tid_tx[tid]) {
382 #ifdef CONFIG_MAC80211_HT_DEBUG
384 printk(KERN_ERR "allocate tx mlme to tid %d failed\n",
391 sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.function =
392 sta_addba_resp_timer_expired;
393 sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.data =
394 (unsigned long)&sta->timer_to_tid[tid];
395 init_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
397 /* create a new queue for this aggregation */
398 ret = ieee80211_ht_agg_queue_add(local, sta, tid);
400 /* case no queue is available to aggregation
401 * don't switch to aggregation */
403 #ifdef CONFIG_MAC80211_HT_DEBUG
404 printk(KERN_DEBUG "BA request denied - queue unavailable for"
406 #endif /* CONFIG_MAC80211_HT_DEBUG */
407 goto err_unlock_queue;
411 /* Ok, the Addba frame hasn't been sent yet, but if the driver calls the
412 * call back right away, it must see that the flow has begun */
413 *state |= HT_ADDBA_REQUESTED_MSK;
415 /* This is slightly racy because the queue isn't stopped */
416 start_seq_num = sta->tid_seq[tid];
418 if (local->ops->ampdu_action)
419 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_START,
420 ra, tid, &start_seq_num);
423 /* No need to requeue the packets in the agg queue, since we
424 * held the tx lock: no packet could be enqueued to the newly
426 ieee80211_ht_agg_queue_remove(local, sta, tid, 0);
427 #ifdef CONFIG_MAC80211_HT_DEBUG
428 printk(KERN_DEBUG "BA request denied - HW unavailable for"
430 #endif /* CONFIG_MAC80211_HT_DEBUG */
431 *state = HT_AGG_STATE_IDLE;
432 goto err_unlock_queue;
435 /* Will put all the packets in the new SW queue */
436 ieee80211_requeue(local, ieee802_1d_to_ac[tid]);
437 spin_unlock_bh(&sta->lock);
439 /* send an addBA request */
440 sta->ampdu_mlme.dialog_token_allocator++;
441 sta->ampdu_mlme.tid_tx[tid]->dialog_token =
442 sta->ampdu_mlme.dialog_token_allocator;
443 sta->ampdu_mlme.tid_tx[tid]->ssn = start_seq_num;
446 ieee80211_send_addba_request(sta->sdata, ra, tid,
447 sta->ampdu_mlme.tid_tx[tid]->dialog_token,
448 sta->ampdu_mlme.tid_tx[tid]->ssn,
450 /* activate the timer for the recipient's addBA response */
451 sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.expires =
452 jiffies + ADDBA_RESP_INTERVAL;
453 add_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
454 #ifdef CONFIG_MAC80211_HT_DEBUG
455 printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid);
460 kfree(sta->ampdu_mlme.tid_tx[tid]);
461 sta->ampdu_mlme.tid_tx[tid] = NULL;
464 spin_unlock_bh(&sta->lock);
469 EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
471 int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw,
473 enum ieee80211_back_parties initiator)
475 struct ieee80211_local *local = hw_to_local(hw);
476 struct sta_info *sta;
479 DECLARE_MAC_BUF(mac);
481 if (tid >= STA_TID_NUM)
485 sta = sta_info_get(local, ra);
491 /* check if the TID is in aggregation */
492 state = &sta->ampdu_mlme.tid_state_tx[tid];
493 spin_lock_bh(&sta->lock);
495 if (*state != HT_AGG_STATE_OPERATIONAL) {
500 #ifdef CONFIG_MAC80211_HT_DEBUG
501 printk(KERN_DEBUG "Tx BA session stop requested for %s tid %u\n",
502 print_mac(mac, ra), tid);
503 #endif /* CONFIG_MAC80211_HT_DEBUG */
505 ieee80211_stop_queue(hw, sta->tid_to_tx_q[tid]);
507 *state = HT_AGG_STATE_REQ_STOP_BA_MSK |
508 (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
510 if (local->ops->ampdu_action)
511 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_STOP,
514 /* case HW denied going back to legacy */
516 WARN_ON(ret != -EBUSY);
517 *state = HT_AGG_STATE_OPERATIONAL;
518 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
523 spin_unlock_bh(&sta->lock);
527 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
529 void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid)
531 struct ieee80211_local *local = hw_to_local(hw);
532 struct sta_info *sta;
534 DECLARE_MAC_BUF(mac);
536 if (tid >= STA_TID_NUM) {
537 #ifdef CONFIG_MAC80211_HT_DEBUG
538 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
545 sta = sta_info_get(local, ra);
548 #ifdef CONFIG_MAC80211_HT_DEBUG
549 printk(KERN_DEBUG "Could not find station: %s\n",
555 state = &sta->ampdu_mlme.tid_state_tx[tid];
556 spin_lock_bh(&sta->lock);
558 if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
559 #ifdef CONFIG_MAC80211_HT_DEBUG
560 printk(KERN_DEBUG "addBA was not requested yet, state is %d\n",
563 spin_unlock_bh(&sta->lock);
568 WARN_ON_ONCE(*state & HT_ADDBA_DRV_READY_MSK);
570 *state |= HT_ADDBA_DRV_READY_MSK;
572 if (*state == HT_AGG_STATE_OPERATIONAL) {
573 #ifdef CONFIG_MAC80211_HT_DEBUG
574 printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid);
576 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
578 spin_unlock_bh(&sta->lock);
581 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb);
583 void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid)
585 struct ieee80211_local *local = hw_to_local(hw);
586 struct sta_info *sta;
589 DECLARE_MAC_BUF(mac);
591 if (tid >= STA_TID_NUM) {
592 #ifdef CONFIG_MAC80211_HT_DEBUG
593 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
599 #ifdef CONFIG_MAC80211_HT_DEBUG
600 printk(KERN_DEBUG "Stopping Tx BA session for %s tid %d\n",
601 print_mac(mac, ra), tid);
602 #endif /* CONFIG_MAC80211_HT_DEBUG */
605 sta = sta_info_get(local, ra);
607 #ifdef CONFIG_MAC80211_HT_DEBUG
608 printk(KERN_DEBUG "Could not find station: %s\n",
614 state = &sta->ampdu_mlme.tid_state_tx[tid];
616 /* NOTE: no need to use sta->lock in this state check, as
617 * ieee80211_stop_tx_ba_session will let only one stop call to
618 * pass through per sta/tid
620 if ((*state & HT_AGG_STATE_REQ_STOP_BA_MSK) == 0) {
621 #ifdef CONFIG_MAC80211_HT_DEBUG
622 printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n");
628 if (*state & HT_AGG_STATE_INITIATOR_MSK)
629 ieee80211_send_delba(sta->sdata, ra, tid,
630 WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
632 agg_queue = sta->tid_to_tx_q[tid];
634 ieee80211_ht_agg_queue_remove(local, sta, tid, 1);
636 /* We just requeued the all the frames that were in the
637 * removed queue, and since we might miss a softirq we do
638 * netif_schedule_queue. ieee80211_wake_queue is not used
639 * here as this queue is not necessarily stopped
641 netif_schedule_queue(netdev_get_tx_queue(local->mdev, agg_queue));
642 spin_lock_bh(&sta->lock);
643 *state = HT_AGG_STATE_IDLE;
644 sta->ampdu_mlme.addba_req_num[tid] = 0;
645 kfree(sta->ampdu_mlme.tid_tx[tid]);
646 sta->ampdu_mlme.tid_tx[tid] = NULL;
647 spin_unlock_bh(&sta->lock);
651 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb);
653 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
654 const u8 *ra, u16 tid)
656 struct ieee80211_local *local = hw_to_local(hw);
657 struct ieee80211_ra_tid *ra_tid;
658 struct sk_buff *skb = dev_alloc_skb(0);
660 if (unlikely(!skb)) {
661 #ifdef CONFIG_MAC80211_HT_DEBUG
663 printk(KERN_WARNING "%s: Not enough memory, "
664 "dropping start BA session", skb->dev->name);
668 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
669 memcpy(&ra_tid->ra, ra, ETH_ALEN);
672 skb->pkt_type = IEEE80211_ADDBA_MSG;
673 skb_queue_tail(&local->skb_queue, skb);
674 tasklet_schedule(&local->tasklet);
676 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
678 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
679 const u8 *ra, u16 tid)
681 struct ieee80211_local *local = hw_to_local(hw);
682 struct ieee80211_ra_tid *ra_tid;
683 struct sk_buff *skb = dev_alloc_skb(0);
685 if (unlikely(!skb)) {
686 #ifdef CONFIG_MAC80211_HT_DEBUG
688 printk(KERN_WARNING "%s: Not enough memory, "
689 "dropping stop BA session", skb->dev->name);
693 ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
694 memcpy(&ra_tid->ra, ra, ETH_ALEN);
697 skb->pkt_type = IEEE80211_DELBA_MSG;
698 skb_queue_tail(&local->skb_queue, skb);
699 tasklet_schedule(&local->tasklet);
701 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);