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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> | |
a93e3644 | 9 | * Copyright 2007-2010, Intel Corporation |
b8695a8f JB |
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 | ||
73a72a81 JB |
16 | /** |
17 | * DOC: RX A-MPDU aggregation | |
18 | * | |
19 | * Aggregation on the RX side requires only implementing the | |
20 | * @ampdu_action callback that is invoked to start/stop any | |
21 | * block-ack sessions for RX aggregation. | |
22 | * | |
23 | * When RX aggregation is started by the peer, the driver is | |
24 | * notified via @ampdu_action function, with the | |
25 | * %IEEE80211_AMPDU_RX_START action, and may reject the request | |
26 | * in which case a negative response is sent to the peer, if it | |
27 | * accepts it a positive response is sent. | |
28 | * | |
29 | * While the session is active, the device/driver are required | |
30 | * to de-aggregate frames and pass them up one by one to mac80211, | |
31 | * which will handle the reorder buffer. | |
32 | * | |
33 | * When the aggregation session is stopped again by the peer or | |
34 | * ourselves, the driver's @ampdu_action function will be called | |
35 | * with the action %IEEE80211_AMPDU_RX_STOP. In this case, the | |
36 | * call must not fail. | |
37 | */ | |
38 | ||
b8695a8f | 39 | #include <linux/ieee80211.h> |
5a0e3ad6 | 40 | #include <linux/slab.h> |
b8695a8f JB |
41 | #include <net/mac80211.h> |
42 | #include "ieee80211_i.h" | |
24487981 | 43 | #include "driver-ops.h" |
b8695a8f | 44 | |
a87f736d JB |
45 | static void ieee80211_free_tid_rx(struct rcu_head *h) |
46 | { | |
47 | struct tid_ampdu_rx *tid_rx = | |
48 | container_of(h, struct tid_ampdu_rx, rcu_head); | |
49 | int i; | |
50 | ||
51 | for (i = 0; i < tid_rx->buf_size; i++) | |
52 | dev_kfree_skb(tid_rx->reorder_buf[i]); | |
53 | kfree(tid_rx->reorder_buf); | |
54 | kfree(tid_rx->reorder_time); | |
55 | kfree(tid_rx); | |
56 | } | |
57 | ||
7c3b1dd8 JB |
58 | void ___ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid, |
59 | u16 initiator, u16 reason) | |
b8695a8f | 60 | { |
d75636ef | 61 | struct ieee80211_local *local = sta->local; |
098a6070 | 62 | struct tid_ampdu_rx *tid_rx; |
b8695a8f | 63 | |
a93e3644 | 64 | lockdep_assert_held(&sta->ampdu_mlme.mtx); |
098a6070 | 65 | |
a87f736d JB |
66 | tid_rx = sta->ampdu_mlme.tid_rx[tid]; |
67 | ||
7c3b1dd8 | 68 | if (!tid_rx) |
b8695a8f | 69 | return; |
d75636ef | 70 | |
a87f736d | 71 | rcu_assign_pointer(sta->ampdu_mlme.tid_rx[tid], NULL); |
b8695a8f | 72 | |
b8695a8f JB |
73 | #ifdef CONFIG_MAC80211_HT_DEBUG |
74 | printk(KERN_DEBUG "Rx BA session stop requested for %pM tid %u\n", | |
d75636ef | 75 | sta->sta.addr, tid); |
b8695a8f JB |
76 | #endif /* CONFIG_MAC80211_HT_DEBUG */ |
77 | ||
12375ef9 | 78 | if (drv_ampdu_action(local, sta->sdata, IEEE80211_AMPDU_RX_STOP, |
24487981 | 79 | &sta->sta, tid, NULL)) |
b8695a8f JB |
80 | printk(KERN_DEBUG "HW problem - can not stop rx " |
81 | "aggregation for tid %d\n", tid); | |
82 | ||
b8695a8f | 83 | /* check if this is a self generated aggregation halt */ |
098a6070 | 84 | if (initiator == WLAN_BACK_RECIPIENT) |
d75636ef JB |
85 | ieee80211_send_delba(sta->sdata, sta->sta.addr, |
86 | tid, 0, reason); | |
b8695a8f | 87 | |
7c3b1dd8 | 88 | del_timer_sync(&tid_rx->session_timer); |
2bff8ebf | 89 | del_timer_sync(&tid_rx->reorder_timer); |
a87f736d JB |
90 | |
91 | call_rcu(&tid_rx->rcu_head, ieee80211_free_tid_rx); | |
b8695a8f JB |
92 | } |
93 | ||
2aab4c27 JB |
94 | void __ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid, |
95 | u16 initiator, u16 reason) | |
96 | { | |
a93e3644 | 97 | mutex_lock(&sta->ampdu_mlme.mtx); |
7c3b1dd8 | 98 | ___ieee80211_stop_rx_ba_session(sta, tid, initiator, reason); |
a93e3644 | 99 | mutex_unlock(&sta->ampdu_mlme.mtx); |
2aab4c27 JB |
100 | } |
101 | ||
b8695a8f JB |
102 | /* |
103 | * After accepting the AddBA Request we activated a timer, | |
104 | * resetting it after each frame that arrives from the originator. | |
b8695a8f JB |
105 | */ |
106 | static void sta_rx_agg_session_timer_expired(unsigned long data) | |
107 | { | |
108 | /* not an elegant detour, but there is no choice as the timer passes | |
109 | * only one argument, and various sta_info are needed here, so init | |
110 | * flow in sta_info_create gives the TID as data, while the timer_to_id | |
111 | * array gives the sta through container_of */ | |
112 | u8 *ptid = (u8 *)data; | |
113 | u8 *timer_to_id = ptid - *ptid; | |
114 | struct sta_info *sta = container_of(timer_to_id, struct sta_info, | |
115 | timer_to_tid[0]); | |
116 | ||
117 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
118 | printk(KERN_DEBUG "rx session timer expired on tid %d\n", (u16)*ptid); | |
119 | #endif | |
7c3b1dd8 JB |
120 | set_bit(*ptid, sta->ampdu_mlme.tid_rx_timer_expired); |
121 | ieee80211_queue_work(&sta->local->hw, &sta->ampdu_mlme.work); | |
b8695a8f JB |
122 | } |
123 | ||
2bff8ebf CL |
124 | static void sta_rx_agg_reorder_timer_expired(unsigned long data) |
125 | { | |
126 | u8 *ptid = (u8 *)data; | |
127 | u8 *timer_to_id = ptid - *ptid; | |
128 | struct sta_info *sta = container_of(timer_to_id, struct sta_info, | |
129 | timer_to_tid[0]); | |
130 | ||
131 | rcu_read_lock(); | |
132 | spin_lock(&sta->lock); | |
133 | ieee80211_release_reorder_timeout(sta, *ptid); | |
134 | spin_unlock(&sta->lock); | |
135 | rcu_read_unlock(); | |
136 | } | |
137 | ||
b8695a8f JB |
138 | static void ieee80211_send_addba_resp(struct ieee80211_sub_if_data *sdata, u8 *da, u16 tid, |
139 | u8 dialog_token, u16 status, u16 policy, | |
140 | u16 buf_size, u16 timeout) | |
141 | { | |
b8695a8f JB |
142 | struct ieee80211_local *local = sdata->local; |
143 | struct sk_buff *skb; | |
144 | struct ieee80211_mgmt *mgmt; | |
145 | u16 capab; | |
146 | ||
147 | skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); | |
148 | ||
149 | if (!skb) { | |
150 | printk(KERN_DEBUG "%s: failed to allocate buffer " | |
47846c9b | 151 | "for addba resp frame\n", sdata->name); |
b8695a8f JB |
152 | return; |
153 | } | |
154 | ||
155 | skb_reserve(skb, local->hw.extra_tx_headroom); | |
156 | mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); | |
157 | memset(mgmt, 0, 24); | |
158 | memcpy(mgmt->da, da, ETH_ALEN); | |
47846c9b | 159 | memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
8abd3f9b JB |
160 | if (sdata->vif.type == NL80211_IFTYPE_AP || |
161 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
47846c9b | 162 | memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); |
46900298 JB |
163 | else if (sdata->vif.type == NL80211_IFTYPE_STATION) |
164 | memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); | |
165 | ||
b8695a8f JB |
166 | mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
167 | IEEE80211_STYPE_ACTION); | |
168 | ||
169 | skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp)); | |
170 | mgmt->u.action.category = WLAN_CATEGORY_BACK; | |
171 | mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP; | |
172 | mgmt->u.action.u.addba_resp.dialog_token = dialog_token; | |
173 | ||
174 | capab = (u16)(policy << 1); /* bit 1 aggregation policy */ | |
175 | capab |= (u16)(tid << 2); /* bit 5:2 TID number */ | |
176 | capab |= (u16)(buf_size << 6); /* bit 15:6 max size of aggregation */ | |
177 | ||
178 | mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab); | |
179 | mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout); | |
180 | mgmt->u.action.u.addba_resp.status = cpu_to_le16(status); | |
181 | ||
62ae67be | 182 | ieee80211_tx_skb(sdata, skb); |
b8695a8f JB |
183 | } |
184 | ||
185 | void ieee80211_process_addba_request(struct ieee80211_local *local, | |
186 | struct sta_info *sta, | |
187 | struct ieee80211_mgmt *mgmt, | |
188 | size_t len) | |
189 | { | |
190 | struct ieee80211_hw *hw = &local->hw; | |
191 | struct ieee80211_conf *conf = &hw->conf; | |
192 | struct tid_ampdu_rx *tid_agg_rx; | |
193 | u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status; | |
194 | u8 dialog_token; | |
195 | int ret = -EOPNOTSUPP; | |
196 | ||
197 | /* extract session parameters from addba request frame */ | |
198 | dialog_token = mgmt->u.action.u.addba_req.dialog_token; | |
199 | timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout); | |
200 | start_seq_num = | |
201 | le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4; | |
202 | ||
203 | capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab); | |
204 | ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1; | |
205 | tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; | |
206 | buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6; | |
207 | ||
208 | status = WLAN_STATUS_REQUEST_DECLINED; | |
209 | ||
618f356b | 210 | if (test_sta_flags(sta, WLAN_STA_BLOCK_BA)) { |
722f069a S |
211 | #ifdef CONFIG_MAC80211_HT_DEBUG |
212 | printk(KERN_DEBUG "Suspend in progress. " | |
213 | "Denying ADDBA request\n"); | |
214 | #endif | |
215 | goto end_no_lock; | |
216 | } | |
217 | ||
b8695a8f JB |
218 | /* sanity check for incoming parameters: |
219 | * check if configuration can support the BA policy | |
220 | * and if buffer size does not exceeds max value */ | |
221 | /* XXX: check own ht delayed BA capability?? */ | |
f64f9e71 JP |
222 | if (((ba_policy != 1) && |
223 | (!(sta->sta.ht_cap.cap & IEEE80211_HT_CAP_DELAY_BA))) || | |
224 | (buf_size > IEEE80211_MAX_AMPDU_BUF)) { | |
b8695a8f JB |
225 | status = WLAN_STATUS_INVALID_QOS_PARAM; |
226 | #ifdef CONFIG_MAC80211_HT_DEBUG | |
227 | if (net_ratelimit()) | |
228 | printk(KERN_DEBUG "AddBA Req with bad params from " | |
229 | "%pM on tid %u. policy %d, buffer size %d\n", | |
230 | mgmt->sa, tid, ba_policy, | |
231 | buf_size); | |
232 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
233 | goto end_no_lock; | |
234 | } | |
235 | /* determine default buffer size */ | |
236 | if (buf_size == 0) { | |
237 | struct ieee80211_supported_band *sband; | |
238 | ||
239 | sband = local->hw.wiphy->bands[conf->channel->band]; | |
240 | buf_size = IEEE80211_MIN_AMPDU_BUF; | |
241 | buf_size = buf_size << sband->ht_cap.ampdu_factor; | |
242 | } | |
243 | ||
244 | ||
245 | /* examine state machine */ | |
a93e3644 | 246 | mutex_lock(&sta->ampdu_mlme.mtx); |
b8695a8f | 247 | |
a87f736d | 248 | if (sta->ampdu_mlme.tid_rx[tid]) { |
b8695a8f JB |
249 | #ifdef CONFIG_MAC80211_HT_DEBUG |
250 | if (net_ratelimit()) | |
251 | printk(KERN_DEBUG "unexpected AddBA Req from " | |
252 | "%pM on tid %u\n", | |
253 | mgmt->sa, tid); | |
254 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
255 | goto end; | |
256 | } | |
257 | ||
258 | /* prepare A-MPDU MLME for Rx aggregation */ | |
a87f736d JB |
259 | tid_agg_rx = kmalloc(sizeof(struct tid_ampdu_rx), GFP_ATOMIC); |
260 | if (!tid_agg_rx) { | |
b8695a8f JB |
261 | #ifdef CONFIG_MAC80211_HT_DEBUG |
262 | if (net_ratelimit()) | |
263 | printk(KERN_ERR "allocate rx mlme to tid %d failed\n", | |
264 | tid); | |
265 | #endif | |
266 | goto end; | |
267 | } | |
b8695a8f | 268 | |
2bff8ebf CL |
269 | spin_lock_init(&tid_agg_rx->reorder_lock); |
270 | ||
a87f736d JB |
271 | /* rx timer */ |
272 | tid_agg_rx->session_timer.function = sta_rx_agg_session_timer_expired; | |
273 | tid_agg_rx->session_timer.data = (unsigned long)&sta->timer_to_tid[tid]; | |
274 | init_timer(&tid_agg_rx->session_timer); | |
b8695a8f | 275 | |
2bff8ebf CL |
276 | /* rx reorder timer */ |
277 | tid_agg_rx->reorder_timer.function = sta_rx_agg_reorder_timer_expired; | |
278 | tid_agg_rx->reorder_timer.data = (unsigned long)&sta->timer_to_tid[tid]; | |
279 | init_timer(&tid_agg_rx->reorder_timer); | |
280 | ||
b8695a8f JB |
281 | /* prepare reordering buffer */ |
282 | tid_agg_rx->reorder_buf = | |
283 | kcalloc(buf_size, sizeof(struct sk_buff *), GFP_ATOMIC); | |
4d050f1d JM |
284 | tid_agg_rx->reorder_time = |
285 | kcalloc(buf_size, sizeof(unsigned long), GFP_ATOMIC); | |
286 | if (!tid_agg_rx->reorder_buf || !tid_agg_rx->reorder_time) { | |
b8695a8f JB |
287 | #ifdef CONFIG_MAC80211_HT_DEBUG |
288 | if (net_ratelimit()) | |
289 | printk(KERN_ERR "can not allocate reordering buffer " | |
290 | "to tid %d\n", tid); | |
291 | #endif | |
4d050f1d JM |
292 | kfree(tid_agg_rx->reorder_buf); |
293 | kfree(tid_agg_rx->reorder_time); | |
a87f736d | 294 | kfree(tid_agg_rx); |
b8695a8f JB |
295 | goto end; |
296 | } | |
297 | ||
12375ef9 | 298 | ret = drv_ampdu_action(local, sta->sdata, IEEE80211_AMPDU_RX_START, |
24487981 | 299 | &sta->sta, tid, &start_seq_num); |
b8695a8f JB |
300 | #ifdef CONFIG_MAC80211_HT_DEBUG |
301 | printk(KERN_DEBUG "Rx A-MPDU request on tid %d result %d\n", tid, ret); | |
302 | #endif /* CONFIG_MAC80211_HT_DEBUG */ | |
303 | ||
304 | if (ret) { | |
305 | kfree(tid_agg_rx->reorder_buf); | |
a87f736d | 306 | kfree(tid_agg_rx->reorder_time); |
b8695a8f | 307 | kfree(tid_agg_rx); |
b8695a8f JB |
308 | goto end; |
309 | } | |
310 | ||
a87f736d | 311 | /* update data */ |
b8695a8f JB |
312 | tid_agg_rx->dialog_token = dialog_token; |
313 | tid_agg_rx->ssn = start_seq_num; | |
314 | tid_agg_rx->head_seq_num = start_seq_num; | |
315 | tid_agg_rx->buf_size = buf_size; | |
316 | tid_agg_rx->timeout = timeout; | |
317 | tid_agg_rx->stored_mpdu_num = 0; | |
318 | status = WLAN_STATUS_SUCCESS; | |
a87f736d JB |
319 | |
320 | /* activate it for RX */ | |
321 | rcu_assign_pointer(sta->ampdu_mlme.tid_rx[tid], tid_agg_rx); | |
f955ebb4 JB |
322 | |
323 | if (timeout) | |
324 | mod_timer(&tid_agg_rx->session_timer, TU_TO_EXP_TIME(timeout)); | |
325 | ||
b8695a8f | 326 | end: |
a93e3644 | 327 | mutex_unlock(&sta->ampdu_mlme.mtx); |
b8695a8f JB |
328 | |
329 | end_no_lock: | |
330 | ieee80211_send_addba_resp(sta->sdata, sta->sta.addr, tid, | |
331 | dialog_token, status, 1, buf_size, timeout); | |
332 | } |