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/mac80211.h>
18 #include "ieee80211_i.h"
19 #include "driver-ops.h"
21 void __ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid,
22 u16 initiator, u16 reason)
24 struct ieee80211_local *local = sta->local;
27 /* check if TID is in operational state */
28 spin_lock_bh(&sta->lock);
29 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL) {
30 spin_unlock_bh(&sta->lock);
34 sta->ampdu_mlme.tid_state_rx[tid] =
35 HT_AGG_STATE_REQ_STOP_BA_MSK |
36 (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
37 spin_unlock_bh(&sta->lock);
39 #ifdef CONFIG_MAC80211_HT_DEBUG
40 printk(KERN_DEBUG "Rx BA session stop requested for %pM tid %u\n",
42 #endif /* CONFIG_MAC80211_HT_DEBUG */
44 if (drv_ampdu_action(local, &sta->sdata->vif,
45 IEEE80211_AMPDU_RX_STOP,
46 &sta->sta, tid, NULL))
47 printk(KERN_DEBUG "HW problem - can not stop rx "
48 "aggregation for tid %d\n", tid);
50 /* shutdown timer has not expired */
51 if (initiator != WLAN_BACK_TIMER)
52 del_timer_sync(&sta->ampdu_mlme.tid_rx[tid]->session_timer);
54 /* check if this is a self generated aggregation halt */
55 if (initiator == WLAN_BACK_RECIPIENT || initiator == WLAN_BACK_TIMER)
56 ieee80211_send_delba(sta->sdata, sta->sta.addr,
59 /* free the reordering buffer */
60 for (i = 0; i < sta->ampdu_mlme.tid_rx[tid]->buf_size; i++) {
61 if (sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]) {
62 /* release the reordered frames */
63 dev_kfree_skb(sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]);
64 sta->ampdu_mlme.tid_rx[tid]->stored_mpdu_num--;
65 sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i] = NULL;
69 spin_lock_bh(&sta->lock);
71 kfree(sta->ampdu_mlme.tid_rx[tid]->reorder_buf);
72 kfree(sta->ampdu_mlme.tid_rx[tid]->reorder_time);
74 if (!sta->ampdu_mlme.tid_rx[tid]->shutdown) {
75 kfree(sta->ampdu_mlme.tid_rx[tid]);
76 sta->ampdu_mlme.tid_rx[tid] = NULL;
79 sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_IDLE;
80 spin_unlock_bh(&sta->lock);
83 void ieee80211_sta_stop_rx_ba_session(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid,
84 u16 initiator, u16 reason)
86 struct ieee80211_local *local = sdata->local;
89 /* stop HW Rx aggregation. ampdu_action existence
90 * already verified in session init so we add the BUG_ON */
91 BUG_ON(!local->ops->ampdu_action);
95 sta = sta_info_get(local, ra);
101 __ieee80211_stop_rx_ba_session(sta, tid, initiator, reason);
107 * After accepting the AddBA Request we activated a timer,
108 * resetting it after each frame that arrives from the originator.
109 * if this timer expires ieee80211_sta_stop_rx_ba_session will be executed.
111 static void sta_rx_agg_session_timer_expired(unsigned long data)
113 /* not an elegant detour, but there is no choice as the timer passes
114 * only one argument, and various sta_info are needed here, so init
115 * flow in sta_info_create gives the TID as data, while the timer_to_id
116 * array gives the sta through container_of */
117 u8 *ptid = (u8 *)data;
118 u8 *timer_to_id = ptid - *ptid;
119 struct sta_info *sta = container_of(timer_to_id, struct sta_info,
122 #ifdef CONFIG_MAC80211_HT_DEBUG
123 printk(KERN_DEBUG "rx session timer expired on tid %d\n", (u16)*ptid);
125 ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr,
126 (u16)*ptid, WLAN_BACK_TIMER,
127 WLAN_REASON_QSTA_TIMEOUT);
130 static void ieee80211_send_addba_resp(struct ieee80211_sub_if_data *sdata, u8 *da, u16 tid,
131 u8 dialog_token, u16 status, u16 policy,
132 u16 buf_size, u16 timeout)
134 struct ieee80211_local *local = sdata->local;
136 struct ieee80211_mgmt *mgmt;
139 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
142 printk(KERN_DEBUG "%s: failed to allocate buffer "
143 "for addba resp frame\n", sdata->dev->name);
147 skb_reserve(skb, local->hw.extra_tx_headroom);
148 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
150 memcpy(mgmt->da, da, ETH_ALEN);
151 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
152 if (sdata->vif.type == NL80211_IFTYPE_AP ||
153 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
154 memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
155 else if (sdata->vif.type == NL80211_IFTYPE_STATION)
156 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
158 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
159 IEEE80211_STYPE_ACTION);
161 skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp));
162 mgmt->u.action.category = WLAN_CATEGORY_BACK;
163 mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP;
164 mgmt->u.action.u.addba_resp.dialog_token = dialog_token;
166 capab = (u16)(policy << 1); /* bit 1 aggregation policy */
167 capab |= (u16)(tid << 2); /* bit 5:2 TID number */
168 capab |= (u16)(buf_size << 6); /* bit 15:6 max size of aggregation */
170 mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab);
171 mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout);
172 mgmt->u.action.u.addba_resp.status = cpu_to_le16(status);
174 ieee80211_tx_skb(sdata, skb);
177 void ieee80211_process_addba_request(struct ieee80211_local *local,
178 struct sta_info *sta,
179 struct ieee80211_mgmt *mgmt,
182 struct ieee80211_hw *hw = &local->hw;
183 struct ieee80211_conf *conf = &hw->conf;
184 struct tid_ampdu_rx *tid_agg_rx;
185 u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status;
187 int ret = -EOPNOTSUPP;
189 /* extract session parameters from addba request frame */
190 dialog_token = mgmt->u.action.u.addba_req.dialog_token;
191 timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout);
193 le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4;
195 capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab);
196 ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1;
197 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
198 buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;
200 status = WLAN_STATUS_REQUEST_DECLINED;
202 if (test_sta_flags(sta, WLAN_STA_SUSPEND)) {
203 #ifdef CONFIG_MAC80211_HT_DEBUG
204 printk(KERN_DEBUG "Suspend in progress. "
205 "Denying ADDBA request\n");
210 /* sanity check for incoming parameters:
211 * check if configuration can support the BA policy
212 * and if buffer size does not exceeds max value */
213 /* XXX: check own ht delayed BA capability?? */
214 if (((ba_policy != 1)
215 && (!(sta->sta.ht_cap.cap & IEEE80211_HT_CAP_DELAY_BA)))
216 || (buf_size > IEEE80211_MAX_AMPDU_BUF)) {
217 status = WLAN_STATUS_INVALID_QOS_PARAM;
218 #ifdef CONFIG_MAC80211_HT_DEBUG
220 printk(KERN_DEBUG "AddBA Req with bad params from "
221 "%pM on tid %u. policy %d, buffer size %d\n",
222 mgmt->sa, tid, ba_policy,
224 #endif /* CONFIG_MAC80211_HT_DEBUG */
227 /* determine default buffer size */
229 struct ieee80211_supported_band *sband;
231 sband = local->hw.wiphy->bands[conf->channel->band];
232 buf_size = IEEE80211_MIN_AMPDU_BUF;
233 buf_size = buf_size << sband->ht_cap.ampdu_factor;
237 /* examine state machine */
238 spin_lock_bh(&sta->lock);
240 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_IDLE) {
241 #ifdef CONFIG_MAC80211_HT_DEBUG
243 printk(KERN_DEBUG "unexpected AddBA Req from "
246 #endif /* CONFIG_MAC80211_HT_DEBUG */
250 /* prepare A-MPDU MLME for Rx aggregation */
251 sta->ampdu_mlme.tid_rx[tid] =
252 kmalloc(sizeof(struct tid_ampdu_rx), GFP_ATOMIC);
253 if (!sta->ampdu_mlme.tid_rx[tid]) {
254 #ifdef CONFIG_MAC80211_HT_DEBUG
256 printk(KERN_ERR "allocate rx mlme to tid %d failed\n",
262 sta->ampdu_mlme.tid_rx[tid]->session_timer.function =
263 sta_rx_agg_session_timer_expired;
264 sta->ampdu_mlme.tid_rx[tid]->session_timer.data =
265 (unsigned long)&sta->timer_to_tid[tid];
266 init_timer(&sta->ampdu_mlme.tid_rx[tid]->session_timer);
268 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
270 /* prepare reordering buffer */
271 tid_agg_rx->reorder_buf =
272 kcalloc(buf_size, sizeof(struct sk_buff *), GFP_ATOMIC);
273 tid_agg_rx->reorder_time =
274 kcalloc(buf_size, sizeof(unsigned long), GFP_ATOMIC);
275 if (!tid_agg_rx->reorder_buf || !tid_agg_rx->reorder_time) {
276 #ifdef CONFIG_MAC80211_HT_DEBUG
278 printk(KERN_ERR "can not allocate reordering buffer "
281 kfree(tid_agg_rx->reorder_buf);
282 kfree(tid_agg_rx->reorder_time);
283 kfree(sta->ampdu_mlme.tid_rx[tid]);
284 sta->ampdu_mlme.tid_rx[tid] = NULL;
288 ret = drv_ampdu_action(local, &sta->sdata->vif,
289 IEEE80211_AMPDU_RX_START,
290 &sta->sta, tid, &start_seq_num);
291 #ifdef CONFIG_MAC80211_HT_DEBUG
292 printk(KERN_DEBUG "Rx A-MPDU request on tid %d result %d\n", tid, ret);
293 #endif /* CONFIG_MAC80211_HT_DEBUG */
296 kfree(tid_agg_rx->reorder_buf);
298 sta->ampdu_mlme.tid_rx[tid] = NULL;
302 /* change state and send addba resp */
303 sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_OPERATIONAL;
304 tid_agg_rx->dialog_token = dialog_token;
305 tid_agg_rx->ssn = start_seq_num;
306 tid_agg_rx->head_seq_num = start_seq_num;
307 tid_agg_rx->buf_size = buf_size;
308 tid_agg_rx->timeout = timeout;
309 tid_agg_rx->stored_mpdu_num = 0;
310 status = WLAN_STATUS_SUCCESS;
312 spin_unlock_bh(&sta->lock);
315 ieee80211_send_addba_resp(sta->sdata, sta->sta.addr, tid,
316 dialog_token, status, 1, buf_size, timeout);