blob: bc064d7933ff692e2728bfc68c81ded152c930c1 [file] [log] [blame]
Johannes Bergb8695a82009-02-10 21:25:46 +01001/*
2 * HT handling
3 *
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
10 *
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.
14 */
15
16#include <linux/ieee80211.h>
17#include <net/mac80211.h>
18#include "ieee80211_i.h"
Johannes Berg24487982009-04-23 18:52:52 +020019#include "driver-ops.h"
Johannes Bergb8695a82009-02-10 21:25:46 +010020
Johannes Berg849b7962009-02-10 21:25:54 +010021void __ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid,
22 u16 initiator, u16 reason)
Johannes Bergb8695a82009-02-10 21:25:46 +010023{
Johannes Bergd75636e2009-02-10 21:25:53 +010024 struct ieee80211_local *local = sta->local;
Johannes Bergd75636e2009-02-10 21:25:53 +010025 int i;
Johannes Bergb8695a82009-02-10 21:25:46 +010026
27 /* check if TID is in operational state */
28 spin_lock_bh(&sta->lock);
Johannes Bergd75636e2009-02-10 21:25:53 +010029 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL) {
Johannes Bergb8695a82009-02-10 21:25:46 +010030 spin_unlock_bh(&sta->lock);
Johannes Bergb8695a82009-02-10 21:25:46 +010031 return;
32 }
Johannes Bergd75636e2009-02-10 21:25:53 +010033
Johannes Bergb8695a82009-02-10 21:25:46 +010034 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);
38
Johannes Bergb8695a82009-02-10 21:25:46 +010039#ifdef CONFIG_MAC80211_HT_DEBUG
40 printk(KERN_DEBUG "Rx BA session stop requested for %pM tid %u\n",
Johannes Bergd75636e2009-02-10 21:25:53 +010041 sta->sta.addr, tid);
Johannes Bergb8695a82009-02-10 21:25:46 +010042#endif /* CONFIG_MAC80211_HT_DEBUG */
43
Johannes Berg24487982009-04-23 18:52:52 +020044 if (drv_ampdu_action(local, IEEE80211_AMPDU_RX_STOP,
45 &sta->sta, tid, NULL))
Johannes Bergb8695a82009-02-10 21:25:46 +010046 printk(KERN_DEBUG "HW problem - can not stop rx "
47 "aggregation for tid %d\n", tid);
48
49 /* shutdown timer has not expired */
50 if (initiator != WLAN_BACK_TIMER)
51 del_timer_sync(&sta->ampdu_mlme.tid_rx[tid]->session_timer);
52
53 /* check if this is a self generated aggregation halt */
54 if (initiator == WLAN_BACK_RECIPIENT || initiator == WLAN_BACK_TIMER)
Johannes Bergd75636e2009-02-10 21:25:53 +010055 ieee80211_send_delba(sta->sdata, sta->sta.addr,
56 tid, 0, reason);
Johannes Bergb8695a82009-02-10 21:25:46 +010057
58 /* free the reordering buffer */
59 for (i = 0; i < sta->ampdu_mlme.tid_rx[tid]->buf_size; i++) {
60 if (sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]) {
61 /* release the reordered frames */
62 dev_kfree_skb(sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]);
63 sta->ampdu_mlme.tid_rx[tid]->stored_mpdu_num--;
64 sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i] = NULL;
65 }
66 }
Johannes Berg55687e32009-02-10 21:25:51 +010067
68 spin_lock_bh(&sta->lock);
Johannes Bergb8695a82009-02-10 21:25:46 +010069 /* free resources */
70 kfree(sta->ampdu_mlme.tid_rx[tid]->reorder_buf);
Jouni Malinen4d050f12009-05-05 20:35:14 +030071 kfree(sta->ampdu_mlme.tid_rx[tid]->reorder_time);
Johannes Berg55687e32009-02-10 21:25:51 +010072
73 if (!sta->ampdu_mlme.tid_rx[tid]->shutdown) {
74 kfree(sta->ampdu_mlme.tid_rx[tid]);
75 sta->ampdu_mlme.tid_rx[tid] = NULL;
76 }
77
Johannes Bergb8695a82009-02-10 21:25:46 +010078 sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_IDLE;
Johannes Berg55687e32009-02-10 21:25:51 +010079 spin_unlock_bh(&sta->lock);
Johannes Bergd75636e2009-02-10 21:25:53 +010080}
81
82void ieee80211_sta_stop_rx_ba_session(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid,
83 u16 initiator, u16 reason)
84{
85 struct ieee80211_local *local = sdata->local;
86 struct sta_info *sta;
87
88 /* stop HW Rx aggregation. ampdu_action existence
89 * already verified in session init so we add the BUG_ON */
90 BUG_ON(!local->ops->ampdu_action);
91
92 rcu_read_lock();
93
94 sta = sta_info_get(local, ra);
95 if (!sta) {
96 rcu_read_unlock();
97 return;
98 }
99
Johannes Berg849b7962009-02-10 21:25:54 +0100100 __ieee80211_stop_rx_ba_session(sta, tid, initiator, reason);
Johannes Bergb8695a82009-02-10 21:25:46 +0100101
102 rcu_read_unlock();
103}
104
105/*
106 * After accepting the AddBA Request we activated a timer,
107 * resetting it after each frame that arrives from the originator.
108 * if this timer expires ieee80211_sta_stop_rx_ba_session will be executed.
109 */
110static void sta_rx_agg_session_timer_expired(unsigned long data)
111{
112 /* not an elegant detour, but there is no choice as the timer passes
113 * only one argument, and various sta_info are needed here, so init
114 * flow in sta_info_create gives the TID as data, while the timer_to_id
115 * array gives the sta through container_of */
116 u8 *ptid = (u8 *)data;
117 u8 *timer_to_id = ptid - *ptid;
118 struct sta_info *sta = container_of(timer_to_id, struct sta_info,
119 timer_to_tid[0]);
120
121#ifdef CONFIG_MAC80211_HT_DEBUG
122 printk(KERN_DEBUG "rx session timer expired on tid %d\n", (u16)*ptid);
123#endif
124 ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr,
125 (u16)*ptid, WLAN_BACK_TIMER,
126 WLAN_REASON_QSTA_TIMEOUT);
127}
128
129static void ieee80211_send_addba_resp(struct ieee80211_sub_if_data *sdata, u8 *da, u16 tid,
130 u8 dialog_token, u16 status, u16 policy,
131 u16 buf_size, u16 timeout)
132{
Johannes Bergb8695a82009-02-10 21:25:46 +0100133 struct ieee80211_local *local = sdata->local;
134 struct sk_buff *skb;
135 struct ieee80211_mgmt *mgmt;
136 u16 capab;
137
138 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
139
140 if (!skb) {
141 printk(KERN_DEBUG "%s: failed to allocate buffer "
142 "for addba resp frame\n", sdata->dev->name);
143 return;
144 }
145
146 skb_reserve(skb, local->hw.extra_tx_headroom);
147 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
148 memset(mgmt, 0, 24);
149 memcpy(mgmt->da, da, ETH_ALEN);
150 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
Johannes Berg8abd3f92009-02-10 21:25:47 +0100151 if (sdata->vif.type == NL80211_IFTYPE_AP ||
152 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
Johannes Bergb8695a82009-02-10 21:25:46 +0100153 memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
Johannes Berg46900292009-02-15 12:44:28 +0100154 else if (sdata->vif.type == NL80211_IFTYPE_STATION)
155 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
156
Johannes Bergb8695a82009-02-10 21:25:46 +0100157 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
158 IEEE80211_STYPE_ACTION);
159
160 skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp));
161 mgmt->u.action.category = WLAN_CATEGORY_BACK;
162 mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP;
163 mgmt->u.action.u.addba_resp.dialog_token = dialog_token;
164
165 capab = (u16)(policy << 1); /* bit 1 aggregation policy */
166 capab |= (u16)(tid << 2); /* bit 5:2 TID number */
167 capab |= (u16)(buf_size << 6); /* bit 15:6 max size of aggregation */
168
169 mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab);
170 mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout);
171 mgmt->u.action.u.addba_resp.status = cpu_to_le16(status);
172
173 ieee80211_tx_skb(sdata, skb, 1);
174}
175
176void ieee80211_process_addba_request(struct ieee80211_local *local,
177 struct sta_info *sta,
178 struct ieee80211_mgmt *mgmt,
179 size_t len)
180{
181 struct ieee80211_hw *hw = &local->hw;
182 struct ieee80211_conf *conf = &hw->conf;
183 struct tid_ampdu_rx *tid_agg_rx;
184 u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status;
185 u8 dialog_token;
186 int ret = -EOPNOTSUPP;
187
188 /* extract session parameters from addba request frame */
189 dialog_token = mgmt->u.action.u.addba_req.dialog_token;
190 timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout);
191 start_seq_num =
192 le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4;
193
194 capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab);
195 ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1;
196 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
197 buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;
198
199 status = WLAN_STATUS_REQUEST_DECLINED;
200
Sujith722f0692009-03-17 08:50:06 +0530201 if (test_sta_flags(sta, WLAN_STA_SUSPEND)) {
202#ifdef CONFIG_MAC80211_HT_DEBUG
203 printk(KERN_DEBUG "Suspend in progress. "
204 "Denying ADDBA request\n");
205#endif
206 goto end_no_lock;
207 }
208
Johannes Bergb8695a82009-02-10 21:25:46 +0100209 /* sanity check for incoming parameters:
210 * check if configuration can support the BA policy
211 * and if buffer size does not exceeds max value */
212 /* XXX: check own ht delayed BA capability?? */
213 if (((ba_policy != 1)
214 && (!(sta->sta.ht_cap.cap & IEEE80211_HT_CAP_DELAY_BA)))
215 || (buf_size > IEEE80211_MAX_AMPDU_BUF)) {
216 status = WLAN_STATUS_INVALID_QOS_PARAM;
217#ifdef CONFIG_MAC80211_HT_DEBUG
218 if (net_ratelimit())
219 printk(KERN_DEBUG "AddBA Req with bad params from "
220 "%pM on tid %u. policy %d, buffer size %d\n",
221 mgmt->sa, tid, ba_policy,
222 buf_size);
223#endif /* CONFIG_MAC80211_HT_DEBUG */
224 goto end_no_lock;
225 }
226 /* determine default buffer size */
227 if (buf_size == 0) {
228 struct ieee80211_supported_band *sband;
229
230 sband = local->hw.wiphy->bands[conf->channel->band];
231 buf_size = IEEE80211_MIN_AMPDU_BUF;
232 buf_size = buf_size << sband->ht_cap.ampdu_factor;
233 }
234
235
236 /* examine state machine */
237 spin_lock_bh(&sta->lock);
238
239 if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_IDLE) {
240#ifdef CONFIG_MAC80211_HT_DEBUG
241 if (net_ratelimit())
242 printk(KERN_DEBUG "unexpected AddBA Req from "
243 "%pM on tid %u\n",
244 mgmt->sa, tid);
245#endif /* CONFIG_MAC80211_HT_DEBUG */
246 goto end;
247 }
248
249 /* prepare A-MPDU MLME for Rx aggregation */
250 sta->ampdu_mlme.tid_rx[tid] =
251 kmalloc(sizeof(struct tid_ampdu_rx), GFP_ATOMIC);
252 if (!sta->ampdu_mlme.tid_rx[tid]) {
253#ifdef CONFIG_MAC80211_HT_DEBUG
254 if (net_ratelimit())
255 printk(KERN_ERR "allocate rx mlme to tid %d failed\n",
256 tid);
257#endif
258 goto end;
259 }
260 /* rx timer */
261 sta->ampdu_mlme.tid_rx[tid]->session_timer.function =
262 sta_rx_agg_session_timer_expired;
263 sta->ampdu_mlme.tid_rx[tid]->session_timer.data =
264 (unsigned long)&sta->timer_to_tid[tid];
265 init_timer(&sta->ampdu_mlme.tid_rx[tid]->session_timer);
266
267 tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
268
269 /* prepare reordering buffer */
270 tid_agg_rx->reorder_buf =
271 kcalloc(buf_size, sizeof(struct sk_buff *), GFP_ATOMIC);
Jouni Malinen4d050f12009-05-05 20:35:14 +0300272 tid_agg_rx->reorder_time =
273 kcalloc(buf_size, sizeof(unsigned long), GFP_ATOMIC);
274 if (!tid_agg_rx->reorder_buf || !tid_agg_rx->reorder_time) {
Johannes Bergb8695a82009-02-10 21:25:46 +0100275#ifdef CONFIG_MAC80211_HT_DEBUG
276 if (net_ratelimit())
277 printk(KERN_ERR "can not allocate reordering buffer "
278 "to tid %d\n", tid);
279#endif
Jouni Malinen4d050f12009-05-05 20:35:14 +0300280 kfree(tid_agg_rx->reorder_buf);
281 kfree(tid_agg_rx->reorder_time);
Johannes Bergb8695a82009-02-10 21:25:46 +0100282 kfree(sta->ampdu_mlme.tid_rx[tid]);
Jouni Malinen4d050f12009-05-05 20:35:14 +0300283 sta->ampdu_mlme.tid_rx[tid] = NULL;
Johannes Bergb8695a82009-02-10 21:25:46 +0100284 goto end;
285 }
286
Johannes Berg24487982009-04-23 18:52:52 +0200287 ret = drv_ampdu_action(local, IEEE80211_AMPDU_RX_START,
288 &sta->sta, tid, &start_seq_num);
Johannes Bergb8695a82009-02-10 21:25:46 +0100289#ifdef CONFIG_MAC80211_HT_DEBUG
290 printk(KERN_DEBUG "Rx A-MPDU request on tid %d result %d\n", tid, ret);
291#endif /* CONFIG_MAC80211_HT_DEBUG */
292
293 if (ret) {
294 kfree(tid_agg_rx->reorder_buf);
295 kfree(tid_agg_rx);
296 sta->ampdu_mlme.tid_rx[tid] = NULL;
297 goto end;
298 }
299
300 /* change state and send addba resp */
301 sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_OPERATIONAL;
302 tid_agg_rx->dialog_token = dialog_token;
303 tid_agg_rx->ssn = start_seq_num;
304 tid_agg_rx->head_seq_num = start_seq_num;
305 tid_agg_rx->buf_size = buf_size;
306 tid_agg_rx->timeout = timeout;
307 tid_agg_rx->stored_mpdu_num = 0;
308 status = WLAN_STATUS_SUCCESS;
309end:
310 spin_unlock_bh(&sta->lock);
311
312end_no_lock:
313 ieee80211_send_addba_resp(sta->sdata, sta->sta.addr, tid,
314 dialog_token, status, 1, buf_size, timeout);
315}