Linux 2.6.33.13
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / mac80211 / agg-rx.c
blob51c7dc3c4c3bac28e849dfd31fb5501ce858e82e
1 /*
2 * HT handling
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;
25 int i;
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);
31 return;
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",
41 sta->sta.addr, tid);
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,
57 tid, 0, reason);
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);
70 /* free resources */
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;
87 struct sta_info *sta;
89 rcu_read_lock();
91 sta = sta_info_get(local, ra);
92 if (!sta) {
93 rcu_read_unlock();
94 return;
97 __ieee80211_stop_rx_ba_session(sta, tid, initiator, reason);
99 rcu_read_unlock();
103 * After accepting the AddBA Request we activated a timer,
104 * resetting it after each frame that arrives from the originator.
105 * if this timer expires ieee80211_sta_stop_rx_ba_session will be executed.
107 static void sta_rx_agg_session_timer_expired(unsigned long data)
109 /* not an elegant detour, but there is no choice as the timer passes
110 * only one argument, and various sta_info are needed here, so init
111 * flow in sta_info_create gives the TID as data, while the timer_to_id
112 * array gives the sta through container_of */
113 u8 *ptid = (u8 *)data;
114 u8 *timer_to_id = ptid - *ptid;
115 struct sta_info *sta = container_of(timer_to_id, struct sta_info,
116 timer_to_tid[0]);
118 #ifdef CONFIG_MAC80211_HT_DEBUG
119 printk(KERN_DEBUG "rx session timer expired on tid %d\n", (u16)*ptid);
120 #endif
121 ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr,
122 (u16)*ptid, WLAN_BACK_TIMER,
123 WLAN_REASON_QSTA_TIMEOUT);
126 static void ieee80211_send_addba_resp(struct ieee80211_sub_if_data *sdata, u8 *da, u16 tid,
127 u8 dialog_token, u16 status, u16 policy,
128 u16 buf_size, u16 timeout)
130 struct ieee80211_local *local = sdata->local;
131 struct sk_buff *skb;
132 struct ieee80211_mgmt *mgmt;
133 u16 capab;
135 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
137 if (!skb) {
138 printk(KERN_DEBUG "%s: failed to allocate buffer "
139 "for addba resp frame\n", sdata->dev->name);
140 return;
143 skb_reserve(skb, local->hw.extra_tx_headroom);
144 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
145 memset(mgmt, 0, 24);
146 memcpy(mgmt->da, da, ETH_ALEN);
147 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
148 if (sdata->vif.type == NL80211_IFTYPE_AP ||
149 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
150 memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
151 else if (sdata->vif.type == NL80211_IFTYPE_STATION)
152 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
154 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
155 IEEE80211_STYPE_ACTION);
157 skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp));
158 mgmt->u.action.category = WLAN_CATEGORY_BACK;
159 mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP;
160 mgmt->u.action.u.addba_resp.dialog_token = dialog_token;
162 capab = (u16)(policy << 1); /* bit 1 aggregation policy */
163 capab |= (u16)(tid << 2); /* bit 5:2 TID number */
164 capab |= (u16)(buf_size << 6); /* bit 15:6 max size of aggregation */
166 mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab);
167 mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout);
168 mgmt->u.action.u.addba_resp.status = cpu_to_le16(status);
170 ieee80211_tx_skb(sdata, skb);
173 void ieee80211_process_addba_request(struct ieee80211_local *local,
174 struct sta_info *sta,
175 struct ieee80211_mgmt *mgmt,
176 size_t len)
178 struct ieee80211_hw *hw = &local->hw;
179 struct ieee80211_conf *conf = &hw->conf;
180 struct tid_ampdu_rx *tid_agg_rx;
181 u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status;
182 u8 dialog_token;
183 int ret = -EOPNOTSUPP;
185 /* extract session parameters from addba request frame */
186 dialog_token = mgmt->u.action.u.addba_req.dialog_token;
187 timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout);
188 start_seq_num =
189 le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4;
191 capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab);
192 ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1;
193 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
194 buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;
196 status = WLAN_STATUS_REQUEST_DECLINED;
198 if (test_sta_flags(sta, WLAN_STA_SUSPEND)) {
199 #ifdef CONFIG_MAC80211_HT_DEBUG
200 printk(KERN_DEBUG "Suspend in progress. "
201 "Denying ADDBA request\n");
202 #endif
203 goto end_no_lock;
206 /* sanity check for incoming parameters:
207 * check if configuration can support the BA policy
208 * and if buffer size does not exceeds max value */
209 /* XXX: check own ht delayed BA capability?? */
210 if (((ba_policy != 1) &&
211 (!(sta->sta.ht_cap.cap & IEEE80211_HT_CAP_DELAY_BA))) ||
212 (buf_size > IEEE80211_MAX_AMPDU_BUF)) {
213 status = WLAN_STATUS_INVALID_QOS_PARAM;
214 #ifdef CONFIG_MAC80211_HT_DEBUG
215 if (net_ratelimit())
216 printk(KERN_DEBUG "AddBA Req with bad params from "
217 "%pM on tid %u. policy %d, buffer size %d\n",
218 mgmt->sa, tid, ba_policy,
219 buf_size);
220 #endif /* CONFIG_MAC80211_HT_DEBUG */
221 goto end_no_lock;
223 /* determine default buffer size */
224 if (buf_size == 0) {
225 struct ieee80211_supported_band *sband;
227 sband = local->hw.wiphy->bands[conf->channel->band];
228 buf_size = IEEE80211_MIN_AMPDU_BUF;
229 buf_size = buf_size << sband->ht_cap.ampdu_factor;
233 /* examine state machine */
234 spin_lock_bh(&sta->lock);
236 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_IDLE) {
237 #ifdef CONFIG_MAC80211_HT_DEBUG
238 if (net_ratelimit())
239 printk(KERN_DEBUG "unexpected AddBA Req from "
240 "%pM on tid %u\n",
241 mgmt->sa, tid);
242 #endif /* CONFIG_MAC80211_HT_DEBUG */
243 goto end;
246 /* prepare A-MPDU MLME for Rx aggregation */
247 sta->ampdu_mlme.tid_rx[tid] =
248 kmalloc(sizeof(struct tid_ampdu_rx), GFP_ATOMIC);
249 if (!sta->ampdu_mlme.tid_rx[tid]) {
250 #ifdef CONFIG_MAC80211_HT_DEBUG
251 if (net_ratelimit())
252 printk(KERN_ERR "allocate rx mlme to tid %d failed\n",
253 tid);
254 #endif
255 goto end;
257 /* rx timer */
258 sta->ampdu_mlme.tid_rx[tid]->session_timer.function =
259 sta_rx_agg_session_timer_expired;
260 sta->ampdu_mlme.tid_rx[tid]->session_timer.data =
261 (unsigned long)&sta->timer_to_tid[tid];
262 init_timer(&sta->ampdu_mlme.tid_rx[tid]->session_timer);
264 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
266 /* prepare reordering buffer */
267 tid_agg_rx->reorder_buf =
268 kcalloc(buf_size, sizeof(struct sk_buff *), GFP_ATOMIC);
269 tid_agg_rx->reorder_time =
270 kcalloc(buf_size, sizeof(unsigned long), GFP_ATOMIC);
271 if (!tid_agg_rx->reorder_buf || !tid_agg_rx->reorder_time) {
272 #ifdef CONFIG_MAC80211_HT_DEBUG
273 if (net_ratelimit())
274 printk(KERN_ERR "can not allocate reordering buffer "
275 "to tid %d\n", tid);
276 #endif
277 kfree(tid_agg_rx->reorder_buf);
278 kfree(tid_agg_rx->reorder_time);
279 kfree(sta->ampdu_mlme.tid_rx[tid]);
280 sta->ampdu_mlme.tid_rx[tid] = NULL;
281 goto end;
284 ret = drv_ampdu_action(local, &sta->sdata->vif,
285 IEEE80211_AMPDU_RX_START,
286 &sta->sta, tid, &start_seq_num);
287 #ifdef CONFIG_MAC80211_HT_DEBUG
288 printk(KERN_DEBUG "Rx A-MPDU request on tid %d result %d\n", tid, ret);
289 #endif /* CONFIG_MAC80211_HT_DEBUG */
291 if (ret) {
292 kfree(tid_agg_rx->reorder_buf);
293 kfree(tid_agg_rx);
294 sta->ampdu_mlme.tid_rx[tid] = NULL;
295 goto end;
298 /* change state and send addba resp */
299 sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_OPERATIONAL;
300 tid_agg_rx->dialog_token = dialog_token;
301 tid_agg_rx->ssn = start_seq_num;
302 tid_agg_rx->head_seq_num = start_seq_num;
303 tid_agg_rx->buf_size = buf_size;
304 tid_agg_rx->timeout = timeout;
305 tid_agg_rx->stored_mpdu_num = 0;
306 status = WLAN_STATUS_SUCCESS;
307 end:
308 spin_unlock_bh(&sta->lock);
310 end_no_lock:
311 ieee80211_send_addba_resp(sta->sdata, sta->sta.addr, tid,
312 dialog_token, status, 1, buf_size, timeout);