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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>
Johannes Berga93e3642010-06-10 10:21:46 +02009 * Copyright 2007-2010, Intel Corporation
Johannes Bergb8695a82009-02-10 21:25:46 +010010 *
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
Johannes Berg73a72a82010-06-10 10:21:50 +020016/**
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
Johannes Bergb8695a82009-02-10 21:25:46 +010039#include <linux/ieee80211.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090040#include <linux/slab.h>
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040041#include <linux/export.h>
Johannes Bergb8695a82009-02-10 21:25:46 +010042#include <net/mac80211.h>
43#include "ieee80211_i.h"
Johannes Berg24487982009-04-23 18:52:52 +020044#include "driver-ops.h"
Johannes Bergb8695a82009-02-10 21:25:46 +010045
Johannes Berga87f7362010-06-10 10:21:38 +020046static 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
Stanislaw Gruszkad72308b2012-03-19 16:00:26 +010052 del_timer_sync(&tid_rx->reorder_timer);
53
Johannes Berga87f7362010-06-10 10:21:38 +020054 for (i = 0; i < tid_rx->buf_size; i++)
Michal Kazior83eb9352014-07-16 12:09:31 +020055 __skb_queue_purge(&tid_rx->reorder_buf[i]);
Johannes Berga87f7362010-06-10 10:21:38 +020056 kfree(tid_rx->reorder_buf);
57 kfree(tid_rx->reorder_time);
58 kfree(tid_rx);
59}
60
Johannes Berg7c3b1dd2010-06-10 10:21:44 +020061void ___ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid,
Johannes Berg53f73c02010-10-05 19:37:40 +020062 u16 initiator, u16 reason, bool tx)
Johannes Bergb8695a82009-02-10 21:25:46 +010063{
Johannes Bergd75636e2009-02-10 21:25:53 +010064 struct ieee80211_local *local = sta->local;
Johannes Berg098a6072010-04-06 11:18:47 +020065 struct tid_ampdu_rx *tid_rx;
Johannes Bergb8695a82009-02-10 21:25:46 +010066
Johannes Berga93e3642010-06-10 10:21:46 +020067 lockdep_assert_held(&sta->ampdu_mlme.mtx);
Johannes Berg098a6072010-04-06 11:18:47 +020068
Johannes Berg40b275b2011-05-13 14:15:49 +020069 tid_rx = rcu_dereference_protected(sta->ampdu_mlme.tid_rx[tid],
70 lockdep_is_held(&sta->ampdu_mlme.mtx));
Johannes Berga87f7362010-06-10 10:21:38 +020071
Johannes Berg7c3b1dd2010-06-10 10:21:44 +020072 if (!tid_rx)
Johannes Bergb8695a82009-02-10 21:25:46 +010073 return;
Johannes Bergd75636e2009-02-10 21:25:53 +010074
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +000075 RCU_INIT_POINTER(sta->ampdu_mlme.tid_rx[tid], NULL);
Johannes Bergb8695a82009-02-10 21:25:46 +010076
Johannes Bergbdcbd8e2012-06-22 11:29:50 +020077 ht_dbg(sta->sdata,
78 "Rx BA session stop requested for %pM tid %u %s reason: %d\n",
79 sta->sta.addr, tid,
80 initiator == WLAN_BACK_RECIPIENT ? "recipient" : "inititator",
81 (int)reason);
Johannes Bergb8695a82009-02-10 21:25:46 +010082
Johannes Berg12375ef2009-11-25 20:30:31 +010083 if (drv_ampdu_action(local, sta->sdata, IEEE80211_AMPDU_RX_STOP,
Johannes Berg0b01f032011-01-18 13:51:05 +010084 &sta->sta, tid, NULL, 0))
Johannes Bergbdcbd8e2012-06-22 11:29:50 +020085 sdata_info(sta->sdata,
Johannes Berg0a214d32013-01-16 10:39:44 +010086 "HW problem - can not stop rx aggregation for %pM tid %d\n",
87 sta->sta.addr, tid);
Johannes Bergb8695a82009-02-10 21:25:46 +010088
Johannes Bergb8695a82009-02-10 21:25:46 +010089 /* check if this is a self generated aggregation halt */
Johannes Berg53f73c02010-10-05 19:37:40 +020090 if (initiator == WLAN_BACK_RECIPIENT && tx)
Johannes Bergd75636e2009-02-10 21:25:53 +010091 ieee80211_send_delba(sta->sdata, sta->sta.addr,
Nikolay Martynova7f39f62011-11-22 21:50:29 -050092 tid, WLAN_BACK_RECIPIENT, reason);
Johannes Bergb8695a82009-02-10 21:25:46 +010093
Johannes Berg7c3b1dd2010-06-10 10:21:44 +020094 del_timer_sync(&tid_rx->session_timer);
Johannes Berga87f7362010-06-10 10:21:38 +020095
96 call_rcu(&tid_rx->rcu_head, ieee80211_free_tid_rx);
Johannes Bergb8695a82009-02-10 21:25:46 +010097}
98
Johannes Berg2aab4c22010-04-19 11:00:24 +020099void __ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid,
Johannes Berg53f73c02010-10-05 19:37:40 +0200100 u16 initiator, u16 reason, bool tx)
Johannes Berg2aab4c22010-04-19 11:00:24 +0200101{
Johannes Berga93e3642010-06-10 10:21:46 +0200102 mutex_lock(&sta->ampdu_mlme.mtx);
Johannes Berg53f73c02010-10-05 19:37:40 +0200103 ___ieee80211_stop_rx_ba_session(sta, tid, initiator, reason, tx);
Johannes Berga93e3642010-06-10 10:21:46 +0200104 mutex_unlock(&sta->ampdu_mlme.mtx);
Johannes Berg2aab4c22010-04-19 11:00:24 +0200105}
106
Shahar Levif41ccd72011-05-22 16:10:21 +0300107void ieee80211_stop_rx_ba_session(struct ieee80211_vif *vif, u16 ba_rx_bitmap,
108 const u8 *addr)
109{
110 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
Eliad Peller0a557ed2011-07-19 13:14:42 +0300111 struct sta_info *sta;
Shahar Levif41ccd72011-05-22 16:10:21 +0300112 int i;
113
Eliad Peller0a557ed2011-07-19 13:14:42 +0300114 rcu_read_lock();
Felix Fietkaubc192f82011-11-23 21:09:49 +0700115 sta = sta_info_get_bss(sdata, addr);
Eliad Peller0a557ed2011-07-19 13:14:42 +0300116 if (!sta) {
117 rcu_read_unlock();
118 return;
119 }
120
Johannes Berg5a306f52012-11-14 23:22:21 +0100121 for (i = 0; i < IEEE80211_NUM_TIDS; i++)
Shahar Levif41ccd72011-05-22 16:10:21 +0300122 if (ba_rx_bitmap & BIT(i))
123 set_bit(i, sta->ampdu_mlme.tid_rx_stop_requested);
124
125 ieee80211_queue_work(&sta->local->hw, &sta->ampdu_mlme.work);
Eliad Peller0a557ed2011-07-19 13:14:42 +0300126 rcu_read_unlock();
Shahar Levif41ccd72011-05-22 16:10:21 +0300127}
128EXPORT_SYMBOL(ieee80211_stop_rx_ba_session);
129
Johannes Bergb8695a82009-02-10 21:25:46 +0100130/*
131 * After accepting the AddBA Request we activated a timer,
132 * resetting it after each frame that arrives from the originator.
Johannes Bergb8695a82009-02-10 21:25:46 +0100133 */
134static void sta_rx_agg_session_timer_expired(unsigned long data)
135{
136 /* not an elegant detour, but there is no choice as the timer passes
137 * only one argument, and various sta_info are needed here, so init
138 * flow in sta_info_create gives the TID as data, while the timer_to_id
139 * array gives the sta through container_of */
140 u8 *ptid = (u8 *)data;
141 u8 *timer_to_id = ptid - *ptid;
142 struct sta_info *sta = container_of(timer_to_id, struct sta_info,
143 timer_to_tid[0]);
Felix Fietkau12d3952f2012-03-18 22:58:06 +0100144 struct tid_ampdu_rx *tid_rx;
145 unsigned long timeout;
146
Felix Fietkaud8c7aae2012-05-30 15:32:24 +0200147 rcu_read_lock();
Felix Fietkau12d3952f2012-03-18 22:58:06 +0100148 tid_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[*ptid]);
Felix Fietkaud8c7aae2012-05-30 15:32:24 +0200149 if (!tid_rx) {
150 rcu_read_unlock();
Felix Fietkau12d3952f2012-03-18 22:58:06 +0100151 return;
Felix Fietkaud8c7aae2012-05-30 15:32:24 +0200152 }
Felix Fietkau12d3952f2012-03-18 22:58:06 +0100153
154 timeout = tid_rx->last_rx + TU_TO_JIFFIES(tid_rx->timeout);
155 if (time_is_after_jiffies(timeout)) {
156 mod_timer(&tid_rx->session_timer, timeout);
Felix Fietkaud8c7aae2012-05-30 15:32:24 +0200157 rcu_read_unlock();
Felix Fietkau12d3952f2012-03-18 22:58:06 +0100158 return;
159 }
Felix Fietkaud8c7aae2012-05-30 15:32:24 +0200160 rcu_read_unlock();
Johannes Bergb8695a82009-02-10 21:25:46 +0100161
Johannes Berg0a214d32013-01-16 10:39:44 +0100162 ht_dbg(sta->sdata, "RX session timer expired on %pM tid %d\n",
163 sta->sta.addr, (u16)*ptid);
Joe Perchesd63e9ae2012-05-15 14:20:31 -0700164
Johannes Berg7c3b1dd2010-06-10 10:21:44 +0200165 set_bit(*ptid, sta->ampdu_mlme.tid_rx_timer_expired);
166 ieee80211_queue_work(&sta->local->hw, &sta->ampdu_mlme.work);
Johannes Bergb8695a82009-02-10 21:25:46 +0100167}
168
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200169static void sta_rx_agg_reorder_timer_expired(unsigned long data)
170{
171 u8 *ptid = (u8 *)data;
172 u8 *timer_to_id = ptid - *ptid;
173 struct sta_info *sta = container_of(timer_to_id, struct sta_info,
174 timer_to_tid[0]);
175
176 rcu_read_lock();
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200177 ieee80211_release_reorder_timeout(sta, *ptid);
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200178 rcu_read_unlock();
179}
180
Johannes Bergb8695a82009-02-10 21:25:46 +0100181static void ieee80211_send_addba_resp(struct ieee80211_sub_if_data *sdata, u8 *da, u16 tid,
182 u8 dialog_token, u16 status, u16 policy,
183 u16 buf_size, u16 timeout)
184{
Johannes Bergb8695a82009-02-10 21:25:46 +0100185 struct ieee80211_local *local = sdata->local;
186 struct sk_buff *skb;
187 struct ieee80211_mgmt *mgmt;
188 u16 capab;
189
190 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
Joe Perchesd15b8452011-08-29 14:17:31 -0700191 if (!skb)
Johannes Bergb8695a82009-02-10 21:25:46 +0100192 return;
Johannes Bergb8695a82009-02-10 21:25:46 +0100193
194 skb_reserve(skb, local->hw.extra_tx_headroom);
195 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
196 memset(mgmt, 0, 24);
197 memcpy(mgmt->da, da, ETH_ALEN);
Johannes Berg47846c92009-11-25 17:46:19 +0100198 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
Johannes Berg8abd3f92009-02-10 21:25:47 +0100199 if (sdata->vif.type == NL80211_IFTYPE_AP ||
Thomas Pedersenae2772b2011-10-26 14:47:29 -0700200 sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
201 sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
Johannes Berg47846c92009-11-25 17:46:19 +0100202 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
Johannes Berg46900292009-02-15 12:44:28 +0100203 else if (sdata->vif.type == NL80211_IFTYPE_STATION)
204 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
Alexander Simon13c40c52011-11-30 16:56:34 +0100205 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
206 memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN);
Johannes Berg46900292009-02-15 12:44:28 +0100207
Johannes Bergb8695a82009-02-10 21:25:46 +0100208 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
209 IEEE80211_STYPE_ACTION);
210
211 skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp));
212 mgmt->u.action.category = WLAN_CATEGORY_BACK;
213 mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP;
214 mgmt->u.action.u.addba_resp.dialog_token = dialog_token;
215
216 capab = (u16)(policy << 1); /* bit 1 aggregation policy */
217 capab |= (u16)(tid << 2); /* bit 5:2 TID number */
218 capab |= (u16)(buf_size << 6); /* bit 15:6 max size of aggregation */
219
220 mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab);
221 mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout);
222 mgmt->u.action.u.addba_resp.status = cpu_to_le16(status);
223
Johannes Berg62ae67b2009-11-18 18:42:05 +0100224 ieee80211_tx_skb(sdata, skb);
Johannes Bergb8695a82009-02-10 21:25:46 +0100225}
226
Michal Kazior08cf42e2014-07-16 12:12:15 +0200227void __ieee80211_start_rx_ba_session(struct sta_info *sta,
228 u8 dialog_token, u16 timeout,
229 u16 start_seq_num, u16 ba_policy, u16 tid,
Michal Kazior4549cf22014-09-02 14:05:10 +0200230 u16 buf_size, bool tx, bool auto_seq)
Johannes Bergb8695a82009-02-10 21:25:46 +0100231{
Michal Kazior08cf42e2014-07-16 12:12:15 +0200232 struct ieee80211_local *local = sta->sdata->local;
Johannes Bergb8695a82009-02-10 21:25:46 +0100233 struct tid_ampdu_rx *tid_agg_rx;
Michal Kazior83eb9352014-07-16 12:09:31 +0200234 int i, ret = -EOPNOTSUPP;
Michal Kazior08cf42e2014-07-16 12:12:15 +0200235 u16 status = WLAN_STATUS_REQUEST_DECLINED;
Johannes Bergb8695a82009-02-10 21:25:46 +0100236
Johannes Bergc2c98fd2011-09-29 16:04:36 +0200237 if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) {
Johannes Berg0a214d32013-01-16 10:39:44 +0100238 ht_dbg(sta->sdata,
239 "Suspend in progress - Denying ADDBA request (%pM tid %d)\n",
240 sta->sta.addr, tid);
Sujith722f0692009-03-17 08:50:06 +0530241 goto end_no_lock;
242 }
243
Johannes Bergb8695a82009-02-10 21:25:46 +0100244 /* sanity check for incoming parameters:
245 * check if configuration can support the BA policy
246 * and if buffer size does not exceeds max value */
247 /* XXX: check own ht delayed BA capability?? */
Joe Perchesf64f9e72009-11-29 16:55:45 -0800248 if (((ba_policy != 1) &&
249 (!(sta->sta.ht_cap.cap & IEEE80211_HT_CAP_DELAY_BA))) ||
250 (buf_size > IEEE80211_MAX_AMPDU_BUF)) {
Johannes Bergb8695a82009-02-10 21:25:46 +0100251 status = WLAN_STATUS_INVALID_QOS_PARAM;
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200252 ht_dbg_ratelimited(sta->sdata,
253 "AddBA Req with bad params from %pM on tid %u. policy %d, buffer size %d\n",
Michal Kazior08cf42e2014-07-16 12:12:15 +0200254 sta->sta.addr, tid, ba_policy, buf_size);
Johannes Bergb8695a82009-02-10 21:25:46 +0100255 goto end_no_lock;
256 }
257 /* determine default buffer size */
Luciano Coelho82694f72011-01-12 15:18:11 +0200258 if (buf_size == 0)
259 buf_size = IEEE80211_MAX_AMPDU_BUF;
Johannes Bergb8695a82009-02-10 21:25:46 +0100260
Luciano Coelhodf6ba5d2011-01-12 15:26:30 +0200261 /* make sure the size doesn't exceed the maximum supported by the hw */
262 if (buf_size > local->hw.max_rx_aggregation_subframes)
263 buf_size = local->hw.max_rx_aggregation_subframes;
Johannes Bergb8695a82009-02-10 21:25:46 +0100264
265 /* examine state machine */
Johannes Berga93e3642010-06-10 10:21:46 +0200266 mutex_lock(&sta->ampdu_mlme.mtx);
Johannes Bergb8695a82009-02-10 21:25:46 +0100267
Johannes Berga87f7362010-06-10 10:21:38 +0200268 if (sta->ampdu_mlme.tid_rx[tid]) {
Johannes Bergbdcbd8e2012-06-22 11:29:50 +0200269 ht_dbg_ratelimited(sta->sdata,
270 "unexpected AddBA Req from %pM on tid %u\n",
Michal Kazior08cf42e2014-07-16 12:12:15 +0200271 sta->sta.addr, tid);
Arik Nemtsov15b4d842011-06-23 01:15:27 +0300272
273 /* delete existing Rx BA session on the same tid */
274 ___ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_RECIPIENT,
275 WLAN_STATUS_UNSPECIFIED_QOS,
276 false);
Johannes Bergb8695a82009-02-10 21:25:46 +0100277 }
278
279 /* prepare A-MPDU MLME for Rx aggregation */
Johannes Bergdd318572010-11-29 11:09:16 +0100280 tid_agg_rx = kmalloc(sizeof(struct tid_ampdu_rx), GFP_KERNEL);
Joe Perchesd15b8452011-08-29 14:17:31 -0700281 if (!tid_agg_rx)
Johannes Bergb8695a82009-02-10 21:25:46 +0100282 goto end;
Johannes Bergb8695a82009-02-10 21:25:46 +0100283
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200284 spin_lock_init(&tid_agg_rx->reorder_lock);
285
Johannes Berga87f7362010-06-10 10:21:38 +0200286 /* rx timer */
287 tid_agg_rx->session_timer.function = sta_rx_agg_session_timer_expired;
288 tid_agg_rx->session_timer.data = (unsigned long)&sta->timer_to_tid[tid];
Felix Fietkau12d3952f2012-03-18 22:58:06 +0100289 init_timer_deferrable(&tid_agg_rx->session_timer);
Johannes Bergb8695a82009-02-10 21:25:46 +0100290
Christian Lamparter2bff8eb2010-08-05 01:36:41 +0200291 /* rx reorder timer */
292 tid_agg_rx->reorder_timer.function = sta_rx_agg_reorder_timer_expired;
293 tid_agg_rx->reorder_timer.data = (unsigned long)&sta->timer_to_tid[tid];
294 init_timer(&tid_agg_rx->reorder_timer);
295
Johannes Bergb8695a82009-02-10 21:25:46 +0100296 /* prepare reordering buffer */
297 tid_agg_rx->reorder_buf =
Michal Kazior83eb9352014-07-16 12:09:31 +0200298 kcalloc(buf_size, sizeof(struct sk_buff_head), GFP_KERNEL);
Jouni Malinen4d050f12009-05-05 20:35:14 +0300299 tid_agg_rx->reorder_time =
Johannes Bergdd318572010-11-29 11:09:16 +0100300 kcalloc(buf_size, sizeof(unsigned long), GFP_KERNEL);
Jouni Malinen4d050f12009-05-05 20:35:14 +0300301 if (!tid_agg_rx->reorder_buf || !tid_agg_rx->reorder_time) {
Jouni Malinen4d050f12009-05-05 20:35:14 +0300302 kfree(tid_agg_rx->reorder_buf);
303 kfree(tid_agg_rx->reorder_time);
Johannes Berga87f7362010-06-10 10:21:38 +0200304 kfree(tid_agg_rx);
Johannes Bergb8695a82009-02-10 21:25:46 +0100305 goto end;
306 }
307
Michal Kazior83eb9352014-07-16 12:09:31 +0200308 for (i = 0; i < buf_size; i++)
309 __skb_queue_head_init(&tid_agg_rx->reorder_buf[i]);
310
Johannes Berg12375ef2009-11-25 20:30:31 +0100311 ret = drv_ampdu_action(local, sta->sdata, IEEE80211_AMPDU_RX_START,
Johannes Berg0b01f032011-01-18 13:51:05 +0100312 &sta->sta, tid, &start_seq_num, 0);
Johannes Berg0a214d32013-01-16 10:39:44 +0100313 ht_dbg(sta->sdata, "Rx A-MPDU request on %pM tid %d result %d\n",
314 sta->sta.addr, tid, ret);
Johannes Bergb8695a82009-02-10 21:25:46 +0100315 if (ret) {
316 kfree(tid_agg_rx->reorder_buf);
Johannes Berga87f7362010-06-10 10:21:38 +0200317 kfree(tid_agg_rx->reorder_time);
Johannes Bergb8695a82009-02-10 21:25:46 +0100318 kfree(tid_agg_rx);
Johannes Bergb8695a82009-02-10 21:25:46 +0100319 goto end;
320 }
321
Johannes Berga87f7362010-06-10 10:21:38 +0200322 /* update data */
Johannes Bergb8695a82009-02-10 21:25:46 +0100323 tid_agg_rx->dialog_token = dialog_token;
324 tid_agg_rx->ssn = start_seq_num;
325 tid_agg_rx->head_seq_num = start_seq_num;
326 tid_agg_rx->buf_size = buf_size;
327 tid_agg_rx->timeout = timeout;
328 tid_agg_rx->stored_mpdu_num = 0;
Michal Kazior4549cf22014-09-02 14:05:10 +0200329 tid_agg_rx->auto_seq = auto_seq;
Johannes Bergb8695a82009-02-10 21:25:46 +0100330 status = WLAN_STATUS_SUCCESS;
Johannes Berga87f7362010-06-10 10:21:38 +0200331
332 /* activate it for RX */
Eric Dumazetcf778b02012-01-12 04:41:32 +0000333 rcu_assign_pointer(sta->ampdu_mlme.tid_rx[tid], tid_agg_rx);
Johannes Bergf955ebb2010-06-10 10:21:45 +0200334
Felix Fietkau12d3952f2012-03-18 22:58:06 +0100335 if (timeout) {
Johannes Bergf955ebb2010-06-10 10:21:45 +0200336 mod_timer(&tid_agg_rx->session_timer, TU_TO_EXP_TIME(timeout));
Felix Fietkau12d3952f2012-03-18 22:58:06 +0100337 tid_agg_rx->last_rx = jiffies;
338 }
Johannes Bergf955ebb2010-06-10 10:21:45 +0200339
Johannes Bergb8695a82009-02-10 21:25:46 +0100340end:
Johannes Berga93e3642010-06-10 10:21:46 +0200341 mutex_unlock(&sta->ampdu_mlme.mtx);
Johannes Bergb8695a82009-02-10 21:25:46 +0100342
343end_no_lock:
Michal Kazior08cf42e2014-07-16 12:12:15 +0200344 if (tx)
345 ieee80211_send_addba_resp(sta->sdata, sta->sta.addr, tid,
346 dialog_token, status, 1, buf_size,
347 timeout);
Johannes Bergb8695a82009-02-10 21:25:46 +0100348}
Michal Kazior08cf42e2014-07-16 12:12:15 +0200349
350void ieee80211_process_addba_request(struct ieee80211_local *local,
351 struct sta_info *sta,
352 struct ieee80211_mgmt *mgmt,
353 size_t len)
354{
355 u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num;
356 u8 dialog_token;
357
358 /* extract session parameters from addba request frame */
359 dialog_token = mgmt->u.action.u.addba_req.dialog_token;
360 timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout);
361 start_seq_num =
362 le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4;
363
364 capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab);
365 ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1;
366 tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
367 buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;
368
369 __ieee80211_start_rx_ba_session(sta, dialog_token, timeout,
370 start_seq_num, ba_policy, tid,
Michal Kazior4549cf22014-09-02 14:05:10 +0200371 buf_size, true, false);
Michal Kazior08cf42e2014-07-16 12:12:15 +0200372}
373
374void ieee80211_start_rx_ba_session_offl(struct ieee80211_vif *vif,
375 const u8 *addr, u16 tid)
376{
377 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
378 struct ieee80211_local *local = sdata->local;
379 struct ieee80211_rx_agg *rx_agg;
380 struct sk_buff *skb = dev_alloc_skb(0);
381
382 if (unlikely(!skb))
383 return;
384
385 rx_agg = (struct ieee80211_rx_agg *) &skb->cb;
386 memcpy(&rx_agg->addr, addr, ETH_ALEN);
387 rx_agg->tid = tid;
388
389 skb->pkt_type = IEEE80211_SDATA_QUEUE_RX_AGG_START;
390 skb_queue_tail(&sdata->skb_queue, skb);
391 ieee80211_queue_work(&local->hw, &sdata->work);
392}
393EXPORT_SYMBOL(ieee80211_start_rx_ba_session_offl);
394
395void ieee80211_stop_rx_ba_session_offl(struct ieee80211_vif *vif,
396 const u8 *addr, u16 tid)
397{
398 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
399 struct ieee80211_local *local = sdata->local;
400 struct ieee80211_rx_agg *rx_agg;
401 struct sk_buff *skb = dev_alloc_skb(0);
402
403 if (unlikely(!skb))
404 return;
405
406 rx_agg = (struct ieee80211_rx_agg *) &skb->cb;
407 memcpy(&rx_agg->addr, addr, ETH_ALEN);
408 rx_agg->tid = tid;
409
410 skb->pkt_type = IEEE80211_SDATA_QUEUE_RX_AGG_STOP;
411 skb_queue_tail(&sdata->skb_queue, skb);
412 ieee80211_queue_work(&local->hw, &sdata->work);
413}
414EXPORT_SYMBOL(ieee80211_stop_rx_ba_session_offl);