Commit | Line | Data |
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b8695a8f JB |
1 | /* |
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" | |
24487981 | 19 | #include "driver-ops.h" |
b8695a8f | 20 | |
849b7967 JB |
21 | void __ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid, |
22 | u16 initiator, u16 reason) | |
b8695a8f | 23 | { |
d75636ef | 24 | struct ieee80211_local *local = sta->local; |
d75636ef | 25 | int i; |
b8695a8f JB |
26 | |
27 | /* check if TID is in operational state */ | |
28 | spin_lock_bh(&sta->lock); | |
d75636ef | 29 | if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL) { |
b8695a8f | 30 | spin_unlock_bh(&sta->lock); |
b8695a8f JB |
31 | return; |
32 | } | |
d75636ef | 33 | |
b8695a8f JB |
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); | |
38 | ||
b8695a8f JB |
39 | #ifdef CONFIG_MAC80211_HT_DEBUG |
40 | printk(KERN_DEBUG "Rx BA session stop requested for %pM tid %u\n", | |
d75636ef | 41 | sta->sta.addr, tid); |
b8695a8f JB |
42 | #endif /* CONFIG_MAC80211_HT_DEBUG */ |
43 | ||
24487981 JB |
44 | if (drv_ampdu_action(local, IEEE80211_AMPDU_RX_STOP, |
45 | &sta->sta, tid, NULL)) | |
b8695a8f JB |
46 | 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) | |
d75636ef JB |
55 | ieee80211_send_delba(sta->sdata, sta->sta.addr, |
56 | tid, 0, reason); | |
b8695a8f JB |
57 | |
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 | } | |
55687e38 JB |
67 | |
68 | spin_lock_bh(&sta->lock); | |
b8695a8f JB |
69 | /* free resources */ |
70 | kfree(sta->ampdu_mlme.tid_rx[tid]->reorder_buf); | |
55687e38 JB |
71 | |
72 | if (!sta->ampdu_mlme.tid_rx[tid]->shutdown) { | |
73 | kfree(sta->ampdu_mlme.tid_rx[tid]); | |
74 | sta->ampdu_mlme.tid_rx[tid] = NULL; | |
75 | } | |
76 | ||
b8695a8f | 77 | sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_IDLE; |
55687e38 | 78 | spin_unlock_bh(&sta->lock); |
d75636ef JB |
79 | } |
80 | ||
81 | void ieee80211_sta_stop_rx_ba_session(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid, | |
82 | u16 initiator, u16 reason) | |
83 | { | |
84 | struct ieee80211_local *local = sdata->local; | |
85 | struct sta_info *sta; | |
86 | ||
87 | /* stop HW Rx aggregation. ampdu_action existence | |
88 | * already verified in session init so we add the BUG_ON */ | |
89 | BUG_ON(!local->ops->ampdu_action); | |
90 | ||
91 | rcu_read_lock(); | |
92 | ||
93 | sta = sta_info_get(local, ra); | |
94 | if (!sta) { | |
95 | rcu_read_unlock(); | |
96 | return; | |
97 | } | |
98 | ||
849b7967 | 99 | __ieee80211_stop_rx_ba_session(sta, tid, initiator, reason); |
b8695a8f JB |
100 | |
101 | rcu_read_unlock(); | |
102 | } | |
103 | ||
104 | /* | |
105 | * After accepting the AddBA Request we activated a timer, | |
106 | * resetting it after each frame that arrives from the originator. | |
107 | * if this timer expires ieee80211_sta_stop_rx_ba_session will be executed. | |
108 | */ | |
109 | static void sta_rx_agg_session_timer_expired(unsigned long data) | |
110 | { | |
111 | /* not an elegant detour, but there is no choice as the timer passes | |
112 | * only one argument, and various sta_info are needed here, so init | |
113 | * flow in sta_info_create gives the TID as data, while the timer_to_id | |
114 | * array gives the sta through container_of */ | |
115 | u8 *ptid = (u8 *)data; | |
116 | u8 *timer_to_id = ptid - *ptid; | |
117 | struct sta_info *sta = container_of(timer_to_id, struct sta_info, | |
118 | timer_to_tid[0]); | |
119 | ||
120 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
121 | printk(KERN_DEBUG "rx session timer expired on tid %d\n", (u16)*ptid); | |
122 | #endif | |
123 | ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr, | |
124 | (u16)*ptid, WLAN_BACK_TIMER, | |
125 | WLAN_REASON_QSTA_TIMEOUT); | |
126 | } | |
127 | ||
128 | static void ieee80211_send_addba_resp(struct ieee80211_sub_if_data *sdata, u8 *da, u16 tid, | |
129 | u8 dialog_token, u16 status, u16 policy, | |
130 | u16 buf_size, u16 timeout) | |
131 | { | |
b8695a8f JB |
132 | struct ieee80211_local *local = sdata->local; |
133 | struct sk_buff *skb; | |
134 | struct ieee80211_mgmt *mgmt; | |
135 | u16 capab; | |
136 | ||
137 | skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); | |
138 | ||
139 | if (!skb) { | |
140 | printk(KERN_DEBUG "%s: failed to allocate buffer " | |
141 | "for addba resp frame\n", sdata->dev->name); | |
142 | return; | |
143 | } | |
144 | ||
145 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
146 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); | |
147 | memset(mgmt, 0, 24); | |
148 | memcpy(mgmt->da, da, ETH_ALEN); | |
149 | memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); | |
8abd3f9b JB |
150 | if (sdata->vif.type == NL80211_IFTYPE_AP || |
151 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
b8695a8f | 152 | memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN); |
46900298 JB |
153 | else if (sdata->vif.type == NL80211_IFTYPE_STATION) |
154 | memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); | |
155 | ||
b8695a8f JB |
156 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
157 | IEEE80211_STYPE_ACTION); | |
158 | ||
159 | skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp)); | |
160 | mgmt->u.action.category = WLAN_CATEGORY_BACK; | |
161 | mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP; | |
162 | mgmt->u.action.u.addba_resp.dialog_token = dialog_token; | |
163 | ||
164 | capab = (u16)(policy << 1); /* bit 1 aggregation policy */ | |
165 | capab |= (u16)(tid << 2); /* bit 5:2 TID number */ | |
166 | capab |= (u16)(buf_size << 6); /* bit 15:6 max size of aggregation */ | |
167 | ||
168 | mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab); | |
169 | mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout); | |
170 | mgmt->u.action.u.addba_resp.status = cpu_to_le16(status); | |
171 | ||
172 | ieee80211_tx_skb(sdata, skb, 1); | |
173 | } | |
174 | ||
175 | void ieee80211_process_addba_request(struct ieee80211_local *local, | |
176 | struct sta_info *sta, | |
177 | struct ieee80211_mgmt *mgmt, | |
178 | size_t len) | |
179 | { | |
180 | struct ieee80211_hw *hw = &local->hw; | |
181 | struct ieee80211_conf *conf = &hw->conf; | |
182 | struct tid_ampdu_rx *tid_agg_rx; | |
183 | u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status; | |
184 | u8 dialog_token; | |
185 | int ret = -EOPNOTSUPP; | |
186 | ||
187 | /* extract session parameters from addba request frame */ | |
188 | dialog_token = mgmt->u.action.u.addba_req.dialog_token; | |
189 | timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout); | |
190 | start_seq_num = | |
191 | le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4; | |
192 | ||
193 | capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab); | |
194 | ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1; | |
195 | tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; | |
196 | buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6; | |
197 | ||
198 | status = WLAN_STATUS_REQUEST_DECLINED; | |
199 | ||
722f069a S |
200 | if (test_sta_flags(sta, WLAN_STA_SUSPEND)) { |
201 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
202 | printk(KERN_DEBUG "Suspend in progress. " | |
203 | "Denying ADDBA request\n"); | |
204 | #endif | |
205 | goto end_no_lock; | |
206 | } | |
207 | ||
b8695a8f JB |
208 | /* sanity check for incoming parameters: |
209 | * check if configuration can support the BA policy | |
210 | * and if buffer size does not exceeds max value */ | |
211 | /* XXX: check own ht delayed BA capability?? */ | |
212 | if (((ba_policy != 1) | |
213 | && (!(sta->sta.ht_cap.cap & IEEE80211_HT_CAP_DELAY_BA))) | |
214 | || (buf_size > IEEE80211_MAX_AMPDU_BUF)) { | |
215 | status = WLAN_STATUS_INVALID_QOS_PARAM; | |
216 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
217 | if (net_ratelimit()) | |
218 | printk(KERN_DEBUG "AddBA Req with bad params from " | |
219 | "%pM on tid %u. policy %d, buffer size %d\n", | |
220 | mgmt->sa, tid, ba_policy, | |
221 | buf_size); | |
222 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
223 | goto end_no_lock; | |
224 | } | |
225 | /* determine default buffer size */ | |
226 | if (buf_size == 0) { | |
227 | struct ieee80211_supported_band *sband; | |
228 | ||
229 | sband = local->hw.wiphy->bands[conf->channel->band]; | |
230 | buf_size = IEEE80211_MIN_AMPDU_BUF; | |
231 | buf_size = buf_size << sband->ht_cap.ampdu_factor; | |
232 | } | |
233 | ||
234 | ||
235 | /* examine state machine */ | |
236 | spin_lock_bh(&sta->lock); | |
237 | ||
238 | if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_IDLE) { | |
239 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
240 | if (net_ratelimit()) | |
241 | printk(KERN_DEBUG "unexpected AddBA Req from " | |
242 | "%pM on tid %u\n", | |
243 | mgmt->sa, tid); | |
244 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
245 | goto end; | |
246 | } | |
247 | ||
248 | /* prepare A-MPDU MLME for Rx aggregation */ | |
249 | sta->ampdu_mlme.tid_rx[tid] = | |
250 | kmalloc(sizeof(struct tid_ampdu_rx), GFP_ATOMIC); | |
251 | if (!sta->ampdu_mlme.tid_rx[tid]) { | |
252 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
253 | if (net_ratelimit()) | |
254 | printk(KERN_ERR "allocate rx mlme to tid %d failed\n", | |
255 | tid); | |
256 | #endif | |
257 | goto end; | |
258 | } | |
259 | /* rx timer */ | |
260 | sta->ampdu_mlme.tid_rx[tid]->session_timer.function = | |
261 | sta_rx_agg_session_timer_expired; | |
262 | sta->ampdu_mlme.tid_rx[tid]->session_timer.data = | |
263 | (unsigned long)&sta->timer_to_tid[tid]; | |
264 | init_timer(&sta->ampdu_mlme.tid_rx[tid]->session_timer); | |
265 | ||
266 | tid_agg_rx = sta->ampdu_mlme.tid_rx[tid]; | |
267 | ||
268 | /* prepare reordering buffer */ | |
269 | tid_agg_rx->reorder_buf = | |
270 | kcalloc(buf_size, sizeof(struct sk_buff *), GFP_ATOMIC); | |
271 | if (!tid_agg_rx->reorder_buf) { | |
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(sta->ampdu_mlme.tid_rx[tid]); | |
278 | goto end; | |
279 | } | |
280 | ||
24487981 JB |
281 | ret = drv_ampdu_action(local, IEEE80211_AMPDU_RX_START, |
282 | &sta->sta, tid, &start_seq_num); | |
b8695a8f JB |
283 | #ifdef CONFIG_MAC80211_HT_DEBUG |
284 | printk(KERN_DEBUG "Rx A-MPDU request on tid %d result %d\n", tid, ret); | |
285 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
286 | ||
287 | if (ret) { | |
288 | kfree(tid_agg_rx->reorder_buf); | |
289 | kfree(tid_agg_rx); | |
290 | sta->ampdu_mlme.tid_rx[tid] = NULL; | |
291 | goto end; | |
292 | } | |
293 | ||
294 | /* change state and send addba resp */ | |
295 | sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_OPERATIONAL; | |
296 | tid_agg_rx->dialog_token = dialog_token; | |
297 | tid_agg_rx->ssn = start_seq_num; | |
298 | tid_agg_rx->head_seq_num = start_seq_num; | |
299 | tid_agg_rx->buf_size = buf_size; | |
300 | tid_agg_rx->timeout = timeout; | |
301 | tid_agg_rx->stored_mpdu_num = 0; | |
302 | status = WLAN_STATUS_SUCCESS; | |
303 | end: | |
304 | spin_unlock_bh(&sta->lock); | |
305 | ||
306 | end_no_lock: | |
307 | ieee80211_send_addba_resp(sta->sdata, sta->sta.addr, tid, | |
308 | dialog_token, status, 1, buf_size, timeout); | |
309 | } |