blob: df2b6ace510de802c606be61c5d39dbd2389c75a [file] [log] [blame]
lh9ed821d2023-04-07 01:36:19 -07001/*
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 2007-2010, 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/**
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
39#include <linux/ieee80211.h>
40#include <linux/slab.h>
41#include <linux/export.h>
42#include <net/mac80211.h>
43#include "ieee80211_i.h"
44#include "driver-ops.h"
45
46static void ieee80211_free_tid_rx(struct rcu_head *h)
47{
48 struct tid_ampdu_rx *tid_rx =
49 container_of(h, struct tid_ampdu_rx, rcu_head);
50 int i;
51
52 for (i = 0; i < tid_rx->buf_size; i++)
53 dev_kfree_skb(tid_rx->reorder_buf[i]);
54 kfree(tid_rx->reorder_buf);
55 kfree(tid_rx->reorder_time);
56 kfree(tid_rx);
57}
58
59void ___ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid,
60 u16 initiator, u16 reason, bool tx)
61{
62 struct ieee80211_local *local = sta->local;
63 struct tid_ampdu_rx *tid_rx;
64
65 lockdep_assert_held(&sta->ampdu_mlme.mtx);
66
67 tid_rx = rcu_dereference_protected(sta->ampdu_mlme.tid_rx[tid],
68 lockdep_is_held(&sta->ampdu_mlme.mtx));
69
70 if (!tid_rx)
71 return;
72
73 RCU_INIT_POINTER(sta->ampdu_mlme.tid_rx[tid], NULL);
74
75#ifdef CONFIG_MAC80211_HT_DEBUG
76 printk(KERN_DEBUG
77 "Rx BA session stop requested for %pM tid %u %s reason: %d\n",
78 sta->sta.addr, tid,
79 initiator == WLAN_BACK_RECIPIENT ? "recipient" : "inititator",
80 (int)reason);
81#endif /* CONFIG_MAC80211_HT_DEBUG */
82
83 if (drv_ampdu_action(local, sta->sdata, IEEE80211_AMPDU_RX_STOP,
84 &sta->sta, tid, NULL, 0))
85 printk(KERN_DEBUG "HW problem - can not stop rx "
86 "aggregation for tid %d\n", tid);
87
88 /* check if this is a self generated aggregation halt */
89 if (initiator == WLAN_BACK_RECIPIENT && tx)
90 ieee80211_send_delba(sta->sdata, sta->sta.addr,
91 tid, WLAN_BACK_RECIPIENT, reason);
92
93 del_timer_sync(&tid_rx->session_timer);
94
95 /* make sure ieee80211_sta_reorder_release() doesn't re-arm the timer */
96 spin_lock_bh(&tid_rx->reorder_lock);
97 tid_rx->removed = true;
98 spin_unlock_bh(&tid_rx->reorder_lock);
99 del_timer_sync(&tid_rx->reorder_timer);
100
101 call_rcu(&tid_rx->rcu_head, ieee80211_free_tid_rx);
102}
103
104void __ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid,
105 u16 initiator, u16 reason, bool tx)
106{
107 mutex_lock(&sta->ampdu_mlme.mtx);
108 ___ieee80211_stop_rx_ba_session(sta, tid, initiator, reason, tx);
109 mutex_unlock(&sta->ampdu_mlme.mtx);
110}
111
112void ieee80211_stop_rx_ba_session(struct ieee80211_vif *vif, u16 ba_rx_bitmap,
113 const u8 *addr)
114{
115 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
116 struct sta_info *sta;
117 int i;
118
119 rcu_read_lock();
120 sta = sta_info_get_bss(sdata, addr);
121 if (!sta) {
122 rcu_read_unlock();
123 return;
124 }
125
126 for (i = 0; i < STA_TID_NUM; i++)
127 if (ba_rx_bitmap & BIT(i))
128 set_bit(i, sta->ampdu_mlme.tid_rx_stop_requested);
129
130 ieee80211_queue_work(&sta->local->hw, &sta->ampdu_mlme.work);
131 rcu_read_unlock();
132}
133EXPORT_SYMBOL(ieee80211_stop_rx_ba_session);
134
135/*
136 * After accepting the AddBA Request we activated a timer,
137 * resetting it after each frame that arrives from the originator.
138 */
139static void sta_rx_agg_session_timer_expired(unsigned long data)
140{
141 /* not an elegant detour, but there is no choice as the timer passes
142 * only one argument, and various sta_info are needed here, so init
143 * flow in sta_info_create gives the TID as data, while the timer_to_id
144 * array gives the sta through container_of */
145 u8 *ptid = (u8 *)data;
146 u8 *timer_to_id = ptid - *ptid;
147 struct sta_info *sta = container_of(timer_to_id, struct sta_info,
148 timer_to_tid[0]);
149
150#ifdef CONFIG_MAC80211_HT_DEBUG
151 printk(KERN_DEBUG "rx session timer expired on tid %d\n", (u16)*ptid);
152#endif
153 set_bit(*ptid, sta->ampdu_mlme.tid_rx_timer_expired);
154 ieee80211_queue_work(&sta->local->hw, &sta->ampdu_mlme.work);
155}
156
157static void sta_rx_agg_reorder_timer_expired(unsigned long data)
158{
159 u8 *ptid = (u8 *)data;
160 u8 *timer_to_id = ptid - *ptid;
161 struct sta_info *sta = container_of(timer_to_id, struct sta_info,
162 timer_to_tid[0]);
163
164 rcu_read_lock();
165 ieee80211_release_reorder_timeout(sta, *ptid);
166 rcu_read_unlock();
167}
168
169static void ieee80211_send_addba_resp(struct ieee80211_sub_if_data *sdata, u8 *da, u16 tid,
170 u8 dialog_token, u16 status, u16 policy,
171 u16 buf_size, u16 timeout)
172{
173 struct ieee80211_local *local = sdata->local;
174 struct sk_buff *skb;
175 struct ieee80211_mgmt *mgmt;
176 u16 capab;
177
178 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
179 if (!skb)
180 return;
181
182 skb_reserve(skb, local->hw.extra_tx_headroom);
183 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
184 memset(mgmt, 0, 24);
185 memcpy(mgmt->da, da, ETH_ALEN);
186 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
187 if (sdata->vif.type == NL80211_IFTYPE_AP ||
188 sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
189 sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
190 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
191 else if (sdata->vif.type == NL80211_IFTYPE_STATION)
192 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
193 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
194 memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN);
195
196 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
197 IEEE80211_STYPE_ACTION);
198
199 skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp));
200 mgmt->u.action.category = WLAN_CATEGORY_BACK;
201 mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP;
202 mgmt->u.action.u.addba_resp.dialog_token = dialog_token;
203
204 capab = (u16)(policy << 1); /* bit 1 aggregation policy */
205 capab |= (u16)(tid << 2); /* bit 5:2 TID number */
206 capab |= (u16)(buf_size << 6); /* bit 15:6 max size of aggregation */
207
208 mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab);
209 mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout);
210 mgmt->u.action.u.addba_resp.status = cpu_to_le16(status);
211
212 ieee80211_tx_skb(sdata, skb);
213}
214
215void ieee80211_process_addba_request(struct ieee80211_local *local,
216 struct sta_info *sta,
217 struct ieee80211_mgmt *mgmt,
218 size_t len)
219{
220 struct tid_ampdu_rx *tid_agg_rx;
221 u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status;
222 u8 dialog_token;
223 int ret = -EOPNOTSUPP;
224
225 /* extract session parameters from addba request frame */
226 dialog_token = mgmt->u.action.u.addba_req.dialog_token;
227 timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout);
228 start_seq_num =
229 le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4;
230
231 capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab);
232 ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1;
233 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
234 buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;
235
236 status = WLAN_STATUS_REQUEST_DECLINED;
237
238 if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) {
239#ifdef CONFIG_MAC80211_HT_DEBUG
240 printk(KERN_DEBUG "Suspend in progress. "
241 "Denying ADDBA request\n");
242#endif
243 goto end_no_lock;
244 }
245
246 /* sanity check for incoming parameters:
247 * check if configuration can support the BA policy
248 * and if buffer size does not exceeds max value */
249 /* XXX: check own ht delayed BA capability?? */
250 if (((ba_policy != 1) &&
251 (!(sta->sta.ht_cap.cap & IEEE80211_HT_CAP_DELAY_BA))) ||
252 (buf_size > IEEE80211_MAX_AMPDU_BUF)) {
253 status = WLAN_STATUS_INVALID_QOS_PARAM;
254#ifdef CONFIG_MAC80211_HT_DEBUG
255 if (net_ratelimit())
256 printk(KERN_DEBUG "AddBA Req with bad params from "
257 "%pM on tid %u. policy %d, buffer size %d\n",
258 mgmt->sa, tid, ba_policy,
259 buf_size);
260#endif /* CONFIG_MAC80211_HT_DEBUG */
261 goto end_no_lock;
262 }
263 /* determine default buffer size */
264 if (buf_size == 0)
265 buf_size = IEEE80211_MAX_AMPDU_BUF;
266
267 /* make sure the size doesn't exceed the maximum supported by the hw */
268 if (buf_size > local->hw.max_rx_aggregation_subframes)
269 buf_size = local->hw.max_rx_aggregation_subframes;
270
271 /* examine state machine */
272 mutex_lock(&sta->ampdu_mlme.mtx);
273
274 if (sta->ampdu_mlme.tid_rx[tid]) {
275#ifdef CONFIG_MAC80211_HT_DEBUG
276 if (net_ratelimit())
277 printk(KERN_DEBUG "unexpected AddBA Req from "
278 "%pM on tid %u\n",
279 mgmt->sa, tid);
280#endif /* CONFIG_MAC80211_HT_DEBUG */
281
282 /* delete existing Rx BA session on the same tid */
283 ___ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_RECIPIENT,
284 WLAN_STATUS_UNSPECIFIED_QOS,
285 false);
286 }
287
288 /* prepare A-MPDU MLME for Rx aggregation */
289 tid_agg_rx = kmalloc(sizeof(struct tid_ampdu_rx), GFP_KERNEL);
290 if (!tid_agg_rx)
291 goto end;
292
293 spin_lock_init(&tid_agg_rx->reorder_lock);
294
295 /* rx timer */
296 tid_agg_rx->session_timer.function = sta_rx_agg_session_timer_expired;
297 tid_agg_rx->session_timer.data = (unsigned long)&sta->timer_to_tid[tid];
298 init_timer(&tid_agg_rx->session_timer);
299
300 /* rx reorder timer */
301 tid_agg_rx->reorder_timer.function = sta_rx_agg_reorder_timer_expired;
302 tid_agg_rx->reorder_timer.data = (unsigned long)&sta->timer_to_tid[tid];
303 init_timer(&tid_agg_rx->reorder_timer);
304
305 /* prepare reordering buffer */
306 tid_agg_rx->reorder_buf =
307 kcalloc(buf_size, sizeof(struct sk_buff *), GFP_KERNEL);
308 tid_agg_rx->reorder_time =
309 kcalloc(buf_size, sizeof(unsigned long), GFP_KERNEL);
310 if (!tid_agg_rx->reorder_buf || !tid_agg_rx->reorder_time) {
311 kfree(tid_agg_rx->reorder_buf);
312 kfree(tid_agg_rx->reorder_time);
313 kfree(tid_agg_rx);
314 goto end;
315 }
316
317 ret = drv_ampdu_action(local, sta->sdata, IEEE80211_AMPDU_RX_START,
318 &sta->sta, tid, &start_seq_num, 0);
319#ifdef CONFIG_MAC80211_HT_DEBUG
320 printk(KERN_DEBUG "Rx A-MPDU request on tid %d result %d\n", tid, ret);
321#endif /* CONFIG_MAC80211_HT_DEBUG */
322
323 if (ret) {
324 kfree(tid_agg_rx->reorder_buf);
325 kfree(tid_agg_rx->reorder_time);
326 kfree(tid_agg_rx);
327 goto end;
328 }
329
330 /* update data */
331 tid_agg_rx->dialog_token = dialog_token;
332 tid_agg_rx->ssn = start_seq_num;
333 tid_agg_rx->head_seq_num = start_seq_num;
334 tid_agg_rx->buf_size = buf_size;
335 tid_agg_rx->timeout = timeout;
336 tid_agg_rx->stored_mpdu_num = 0;
337 status = WLAN_STATUS_SUCCESS;
338
339 /* activate it for RX */
340 rcu_assign_pointer(sta->ampdu_mlme.tid_rx[tid], tid_agg_rx);
341
342 if (timeout)
343 mod_timer(&tid_agg_rx->session_timer, TU_TO_EXP_TIME(timeout));
344
345end:
346 mutex_unlock(&sta->ampdu_mlme.mtx);
347
348end_no_lock:
349 ieee80211_send_addba_resp(sta->sdata, sta->sta.addr, tid,
350 dialog_token, status, 1, buf_size, timeout);
351}