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Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab...
[mv-sheeva.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         /* can we TX with MCS rates? */
70         if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED))
71                 return;
72
73         /* Counting from 0, therefore +1 */
74         if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF)
75                 max_tx_streams =
76                         ((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
77                                 >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
78         else
79                 max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS;
80
81         /*
82          * 802.11n D5.0 20.3.5 / 20.6 says:
83          * - indices 0 to 7 and 32 are single spatial stream
84          * - 8 to 31 are multiple spatial streams using equal modulation
85          *   [8..15 for two streams, 16..23 for three and 24..31 for four]
86          * - remainder are multiple spatial streams using unequal modulation
87          */
88         for (i = 0; i < max_tx_streams; i++)
89                 ht_cap->mcs.rx_mask[i] =
90                         sband->ht_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i];
91
92         if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION)
93                 for (i = IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE;
94                      i < IEEE80211_HT_MCS_MASK_LEN; i++)
95                         ht_cap->mcs.rx_mask[i] =
96                                 sband->ht_cap.mcs.rx_mask[i] &
97                                         ht_cap_ie->mcs.rx_mask[i];
98
99         /* handle MCS rate 32 too */
100         if (sband->ht_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1)
101                 ht_cap->mcs.rx_mask[32/8] |= 1;
102 }
103
104 void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta, bool tx)
105 {
106         int i;
107
108         cancel_work_sync(&sta->ampdu_mlme.work);
109
110         for (i = 0; i <  STA_TID_NUM; i++) {
111                 __ieee80211_stop_tx_ba_session(sta, i, WLAN_BACK_INITIATOR, tx);
112                 __ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT,
113                                                WLAN_REASON_QSTA_LEAVE_QBSS, tx);
114         }
115 }
116
117 void ieee80211_ba_session_work(struct work_struct *work)
118 {
119         struct sta_info *sta =
120                 container_of(work, struct sta_info, ampdu_mlme.work);
121         struct tid_ampdu_tx *tid_tx;
122         int tid;
123
124         /*
125          * When this flag is set, new sessions should be
126          * blocked, and existing sessions will be torn
127          * down by the code that set the flag, so this
128          * need not run.
129          */
130         if (test_sta_flags(sta, WLAN_STA_BLOCK_BA))
131                 return;
132
133         mutex_lock(&sta->ampdu_mlme.mtx);
134         for (tid = 0; tid < STA_TID_NUM; tid++) {
135                 if (test_and_clear_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired))
136                         ___ieee80211_stop_rx_ba_session(
137                                 sta, tid, WLAN_BACK_RECIPIENT,
138                                 WLAN_REASON_QSTA_TIMEOUT, true);
139
140                 tid_tx = sta->ampdu_mlme.tid_tx[tid];
141                 if (!tid_tx)
142                         continue;
143
144                 if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state))
145                         ieee80211_tx_ba_session_handle_start(sta, tid);
146                 else if (test_and_clear_bit(HT_AGG_STATE_WANT_STOP,
147                                             &tid_tx->state))
148                         ___ieee80211_stop_tx_ba_session(sta, tid,
149                                                         WLAN_BACK_INITIATOR,
150                                                         true);
151         }
152         mutex_unlock(&sta->ampdu_mlme.mtx);
153 }
154
155 void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
156                           const u8 *da, u16 tid,
157                           u16 initiator, u16 reason_code)
158 {
159         struct ieee80211_local *local = sdata->local;
160         struct sk_buff *skb;
161         struct ieee80211_mgmt *mgmt;
162         u16 params;
163
164         skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
165
166         if (!skb) {
167                 printk(KERN_ERR "%s: failed to allocate buffer "
168                                         "for delba frame\n", sdata->name);
169                 return;
170         }
171
172         skb_reserve(skb, local->hw.extra_tx_headroom);
173         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
174         memset(mgmt, 0, 24);
175         memcpy(mgmt->da, da, ETH_ALEN);
176         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
177         if (sdata->vif.type == NL80211_IFTYPE_AP ||
178             sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
179                 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
180         else if (sdata->vif.type == NL80211_IFTYPE_STATION)
181                 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
182
183         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
184                                           IEEE80211_STYPE_ACTION);
185
186         skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
187
188         mgmt->u.action.category = WLAN_CATEGORY_BACK;
189         mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
190         params = (u16)(initiator << 11);        /* bit 11 initiator */
191         params |= (u16)(tid << 12);             /* bit 15:12 TID number */
192
193         mgmt->u.action.u.delba.params = cpu_to_le16(params);
194         mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
195
196         ieee80211_tx_skb(sdata, skb);
197 }
198
199 void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
200                              struct sta_info *sta,
201                              struct ieee80211_mgmt *mgmt, size_t len)
202 {
203         u16 tid, params;
204         u16 initiator;
205
206         params = le16_to_cpu(mgmt->u.action.u.delba.params);
207         tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
208         initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
209
210 #ifdef CONFIG_MAC80211_HT_DEBUG
211         if (net_ratelimit())
212                 printk(KERN_DEBUG "delba from %pM (%s) tid %d reason code %d\n",
213                         mgmt->sa, initiator ? "initiator" : "recipient", tid,
214                         le16_to_cpu(mgmt->u.action.u.delba.reason_code));
215 #endif /* CONFIG_MAC80211_HT_DEBUG */
216
217         if (initiator == WLAN_BACK_INITIATOR)
218                 __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0,
219                                                true);
220         else
221                 __ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_RECIPIENT,
222                                                true);
223 }
224
225 int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata,
226                                enum ieee80211_smps_mode smps, const u8 *da,
227                                const u8 *bssid)
228 {
229         struct ieee80211_local *local = sdata->local;
230         struct sk_buff *skb;
231         struct ieee80211_mgmt *action_frame;
232
233         /* 27 = header + category + action + smps mode */
234         skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom);
235         if (!skb)
236                 return -ENOMEM;
237
238         skb_reserve(skb, local->hw.extra_tx_headroom);
239         action_frame = (void *)skb_put(skb, 27);
240         memcpy(action_frame->da, da, ETH_ALEN);
241         memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN);
242         memcpy(action_frame->bssid, bssid, ETH_ALEN);
243         action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
244                                                   IEEE80211_STYPE_ACTION);
245         action_frame->u.action.category = WLAN_CATEGORY_HT;
246         action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS;
247         switch (smps) {
248         case IEEE80211_SMPS_AUTOMATIC:
249         case IEEE80211_SMPS_NUM_MODES:
250                 WARN_ON(1);
251         case IEEE80211_SMPS_OFF:
252                 action_frame->u.action.u.ht_smps.smps_control =
253                                 WLAN_HT_SMPS_CONTROL_DISABLED;
254                 break;
255         case IEEE80211_SMPS_STATIC:
256                 action_frame->u.action.u.ht_smps.smps_control =
257                                 WLAN_HT_SMPS_CONTROL_STATIC;
258                 break;
259         case IEEE80211_SMPS_DYNAMIC:
260                 action_frame->u.action.u.ht_smps.smps_control =
261                                 WLAN_HT_SMPS_CONTROL_DYNAMIC;
262                 break;
263         }
264
265         /* we'll do more on status of this frame */
266         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
267         ieee80211_tx_skb(sdata, skb);
268
269         return 0;
270 }
271
272 void ieee80211_request_smps_work(struct work_struct *work)
273 {
274         struct ieee80211_sub_if_data *sdata =
275                 container_of(work, struct ieee80211_sub_if_data,
276                              u.mgd.request_smps_work);
277
278         mutex_lock(&sdata->u.mgd.mtx);
279         __ieee80211_request_smps(sdata, sdata->u.mgd.driver_smps_mode);
280         mutex_unlock(&sdata->u.mgd.mtx);
281 }
282
283 void ieee80211_request_smps(struct ieee80211_vif *vif,
284                             enum ieee80211_smps_mode smps_mode)
285 {
286         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
287
288         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
289                 return;
290
291         if (WARN_ON(smps_mode == IEEE80211_SMPS_OFF))
292                 smps_mode = IEEE80211_SMPS_AUTOMATIC;
293
294         sdata->u.mgd.driver_smps_mode = smps_mode;
295
296         ieee80211_queue_work(&sdata->local->hw,
297                              &sdata->u.mgd.request_smps_work);
298 }
299 /* this might change ... don't want non-open drivers using it */
300 EXPORT_SYMBOL_GPL(ieee80211_request_smps);