mac80211: config hw when going back on-channel
[linux-2.6.git] / net / mac80211 / ht.c
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 2007-2010, 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 #include <linux/ieee80211.h>
17 #include <net/mac80211.h>
18 #include "ieee80211_i.h"
19 #include "rate.h"
20
21 void ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_supported_band *sband,
22                                        struct ieee80211_ht_cap *ht_cap_ie,
23                                        struct ieee80211_sta_ht_cap *ht_cap)
24 {
25         u8 ampdu_info, tx_mcs_set_cap;
26         int i, max_tx_streams;
27
28         BUG_ON(!ht_cap);
29
30         memset(ht_cap, 0, sizeof(*ht_cap));
31
32         if (!ht_cap_ie || !sband->ht_cap.ht_supported)
33                 return;
34
35         ht_cap->ht_supported = true;
36
37         /*
38          * The bits listed in this expression should be
39          * the same for the peer and us, if the station
40          * advertises more then we can't use those thus
41          * we mask them out.
42          */
43         ht_cap->cap = le16_to_cpu(ht_cap_ie->cap_info) &
44                 (sband->ht_cap.cap |
45                  ~(IEEE80211_HT_CAP_LDPC_CODING |
46                    IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
47                    IEEE80211_HT_CAP_GRN_FLD |
48                    IEEE80211_HT_CAP_SGI_20 |
49                    IEEE80211_HT_CAP_SGI_40 |
50                    IEEE80211_HT_CAP_DSSSCCK40));
51         /*
52          * The STBC bits are asymmetric -- if we don't have
53          * TX then mask out the peer's RX and vice versa.
54          */
55         if (!(sband->ht_cap.cap & IEEE80211_HT_CAP_TX_STBC))
56                 ht_cap->cap &= ~IEEE80211_HT_CAP_RX_STBC;
57         if (!(sband->ht_cap.cap & IEEE80211_HT_CAP_RX_STBC))
58                 ht_cap->cap &= ~IEEE80211_HT_CAP_TX_STBC;
59
60         ampdu_info = ht_cap_ie->ampdu_params_info;
61         ht_cap->ampdu_factor =
62                 ampdu_info & IEEE80211_HT_AMPDU_PARM_FACTOR;
63         ht_cap->ampdu_density =
64                 (ampdu_info & IEEE80211_HT_AMPDU_PARM_DENSITY) >> 2;
65
66         /* own MCS TX capabilities */
67         tx_mcs_set_cap = sband->ht_cap.mcs.tx_params;
68
69         /* Copy peer MCS TX capabilities, the driver might need them. */
70         ht_cap->mcs.tx_params = ht_cap_ie->mcs.tx_params;
71
72         /* can we TX with MCS rates? */
73         if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED))
74                 return;
75
76         /* Counting from 0, therefore +1 */
77         if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF)
78                 max_tx_streams =
79                         ((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
80                                 >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
81         else
82                 max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS;
83
84         /*
85          * 802.11n-2009 20.3.5 / 20.6 says:
86          * - indices 0 to 7 and 32 are single spatial stream
87          * - 8 to 31 are multiple spatial streams using equal modulation
88          *   [8..15 for two streams, 16..23 for three and 24..31 for four]
89          * - remainder are multiple spatial streams using unequal modulation
90          */
91         for (i = 0; i < max_tx_streams; i++)
92                 ht_cap->mcs.rx_mask[i] =
93                         sband->ht_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i];
94
95         if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION)
96                 for (i = IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE;
97                      i < IEEE80211_HT_MCS_MASK_LEN; i++)
98                         ht_cap->mcs.rx_mask[i] =
99                                 sband->ht_cap.mcs.rx_mask[i] &
100                                         ht_cap_ie->mcs.rx_mask[i];
101
102         /* handle MCS rate 32 too */
103         if (sband->ht_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1)
104                 ht_cap->mcs.rx_mask[32/8] |= 1;
105 }
106
107 void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta, bool tx)
108 {
109         int i;
110
111         cancel_work_sync(&sta->ampdu_mlme.work);
112
113         for (i = 0; i <  STA_TID_NUM; i++) {
114                 __ieee80211_stop_tx_ba_session(sta, i, WLAN_BACK_INITIATOR, tx);
115                 __ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT,
116                                                WLAN_REASON_QSTA_LEAVE_QBSS, tx);
117         }
118 }
119
120 void ieee80211_ba_session_work(struct work_struct *work)
121 {
122         struct sta_info *sta =
123                 container_of(work, struct sta_info, ampdu_mlme.work);
124         struct tid_ampdu_tx *tid_tx;
125         int tid;
126
127         /*
128          * When this flag is set, new sessions should be
129          * blocked, and existing sessions will be torn
130          * down by the code that set the flag, so this
131          * need not run.
132          */
133         if (test_sta_flags(sta, WLAN_STA_BLOCK_BA))
134                 return;
135
136         mutex_lock(&sta->ampdu_mlme.mtx);
137         for (tid = 0; tid < STA_TID_NUM; tid++) {
138                 if (test_and_clear_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired))
139                         ___ieee80211_stop_rx_ba_session(
140                                 sta, tid, WLAN_BACK_RECIPIENT,
141                                 WLAN_REASON_QSTA_TIMEOUT, true);
142
143                 if (test_and_clear_bit(tid,
144                                        sta->ampdu_mlme.tid_rx_stop_requested))
145                         ___ieee80211_stop_rx_ba_session(
146                                 sta, tid, WLAN_BACK_RECIPIENT,
147                                 WLAN_REASON_UNSPECIFIED, true);
148
149                 tid_tx = sta->ampdu_mlme.tid_start_tx[tid];
150                 if (tid_tx) {
151                         /*
152                          * Assign it over to the normal tid_tx array
153                          * where it "goes live".
154                          */
155                         spin_lock_bh(&sta->lock);
156
157                         sta->ampdu_mlme.tid_start_tx[tid] = NULL;
158                         /* could there be a race? */
159                         if (sta->ampdu_mlme.tid_tx[tid])
160                                 kfree(tid_tx);
161                         else
162                                 ieee80211_assign_tid_tx(sta, tid, tid_tx);
163                         spin_unlock_bh(&sta->lock);
164
165                         ieee80211_tx_ba_session_handle_start(sta, tid);
166                         continue;
167                 }
168
169                 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
170                 if (tid_tx && test_and_clear_bit(HT_AGG_STATE_WANT_STOP,
171                                                  &tid_tx->state))
172                         ___ieee80211_stop_tx_ba_session(sta, tid,
173                                                         WLAN_BACK_INITIATOR,
174                                                         true);
175         }
176         mutex_unlock(&sta->ampdu_mlme.mtx);
177 }
178
179 void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
180                           const u8 *da, u16 tid,
181                           u16 initiator, u16 reason_code)
182 {
183         struct ieee80211_local *local = sdata->local;
184         struct sk_buff *skb;
185         struct ieee80211_mgmt *mgmt;
186         u16 params;
187
188         skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
189
190         if (!skb) {
191                 printk(KERN_ERR "%s: failed to allocate buffer "
192                                         "for delba frame\n", sdata->name);
193                 return;
194         }
195
196         skb_reserve(skb, local->hw.extra_tx_headroom);
197         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
198         memset(mgmt, 0, 24);
199         memcpy(mgmt->da, da, ETH_ALEN);
200         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
201         if (sdata->vif.type == NL80211_IFTYPE_AP ||
202             sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
203                 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
204         else if (sdata->vif.type == NL80211_IFTYPE_STATION)
205                 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
206
207         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
208                                           IEEE80211_STYPE_ACTION);
209
210         skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
211
212         mgmt->u.action.category = WLAN_CATEGORY_BACK;
213         mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
214         params = (u16)(initiator << 11);        /* bit 11 initiator */
215         params |= (u16)(tid << 12);             /* bit 15:12 TID number */
216
217         mgmt->u.action.u.delba.params = cpu_to_le16(params);
218         mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
219
220         ieee80211_tx_skb(sdata, skb);
221 }
222
223 void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
224                              struct sta_info *sta,
225                              struct ieee80211_mgmt *mgmt, size_t len)
226 {
227         u16 tid, params;
228         u16 initiator;
229
230         params = le16_to_cpu(mgmt->u.action.u.delba.params);
231         tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
232         initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
233
234 #ifdef CONFIG_MAC80211_HT_DEBUG
235         if (net_ratelimit())
236                 printk(KERN_DEBUG "delba from %pM (%s) tid %d reason code %d\n",
237                         mgmt->sa, initiator ? "initiator" : "recipient", tid,
238                         le16_to_cpu(mgmt->u.action.u.delba.reason_code));
239 #endif /* CONFIG_MAC80211_HT_DEBUG */
240
241         if (initiator == WLAN_BACK_INITIATOR)
242                 __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0,
243                                                true);
244         else
245                 __ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_RECIPIENT,
246                                                true);
247 }
248
249 int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata,
250                                enum ieee80211_smps_mode smps, const u8 *da,
251                                const u8 *bssid)
252 {
253         struct ieee80211_local *local = sdata->local;
254         struct sk_buff *skb;
255         struct ieee80211_mgmt *action_frame;
256
257         /* 27 = header + category + action + smps mode */
258         skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom);
259         if (!skb)
260                 return -ENOMEM;
261
262         skb_reserve(skb, local->hw.extra_tx_headroom);
263         action_frame = (void *)skb_put(skb, 27);
264         memcpy(action_frame->da, da, ETH_ALEN);
265         memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN);
266         memcpy(action_frame->bssid, bssid, ETH_ALEN);
267         action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
268                                                   IEEE80211_STYPE_ACTION);
269         action_frame->u.action.category = WLAN_CATEGORY_HT;
270         action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS;
271         switch (smps) {
272         case IEEE80211_SMPS_AUTOMATIC:
273         case IEEE80211_SMPS_NUM_MODES:
274                 WARN_ON(1);
275         case IEEE80211_SMPS_OFF:
276                 action_frame->u.action.u.ht_smps.smps_control =
277                                 WLAN_HT_SMPS_CONTROL_DISABLED;
278                 break;
279         case IEEE80211_SMPS_STATIC:
280                 action_frame->u.action.u.ht_smps.smps_control =
281                                 WLAN_HT_SMPS_CONTROL_STATIC;
282                 break;
283         case IEEE80211_SMPS_DYNAMIC:
284                 action_frame->u.action.u.ht_smps.smps_control =
285                                 WLAN_HT_SMPS_CONTROL_DYNAMIC;
286                 break;
287         }
288
289         /* we'll do more on status of this frame */
290         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
291         ieee80211_tx_skb(sdata, skb);
292
293         return 0;
294 }
295
296 void ieee80211_request_smps_work(struct work_struct *work)
297 {
298         struct ieee80211_sub_if_data *sdata =
299                 container_of(work, struct ieee80211_sub_if_data,
300                              u.mgd.request_smps_work);
301
302         mutex_lock(&sdata->u.mgd.mtx);
303         __ieee80211_request_smps(sdata, sdata->u.mgd.driver_smps_mode);
304         mutex_unlock(&sdata->u.mgd.mtx);
305 }
306
307 void ieee80211_request_smps(struct ieee80211_vif *vif,
308                             enum ieee80211_smps_mode smps_mode)
309 {
310         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
311
312         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
313                 return;
314
315         if (WARN_ON(smps_mode == IEEE80211_SMPS_OFF))
316                 smps_mode = IEEE80211_SMPS_AUTOMATIC;
317
318         sdata->u.mgd.driver_smps_mode = smps_mode;
319
320         ieee80211_queue_work(&sdata->local->hw,
321                              &sdata->u.mgd.request_smps_work);
322 }
323 /* this might change ... don't want non-open drivers using it */
324 EXPORT_SYMBOL_GPL(ieee80211_request_smps);