Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wirel...
[kernel.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 2007-2008, 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)
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)
105 {
106         int i;
107
108         for (i = 0; i <  STA_TID_NUM; i++) {
109                 __ieee80211_stop_tx_ba_session(sta, i, WLAN_BACK_INITIATOR);
110                 __ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT,
111                                                WLAN_REASON_QSTA_LEAVE_QBSS);
112         }
113 }
114
115 void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
116                           const u8 *da, u16 tid,
117                           u16 initiator, u16 reason_code)
118 {
119         struct ieee80211_local *local = sdata->local;
120         struct sk_buff *skb;
121         struct ieee80211_mgmt *mgmt;
122         u16 params;
123
124         skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
125
126         if (!skb) {
127                 printk(KERN_ERR "%s: failed to allocate buffer "
128                                         "for delba frame\n", sdata->name);
129                 return;
130         }
131
132         skb_reserve(skb, local->hw.extra_tx_headroom);
133         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
134         memset(mgmt, 0, 24);
135         memcpy(mgmt->da, da, ETH_ALEN);
136         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
137         if (sdata->vif.type == NL80211_IFTYPE_AP ||
138             sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
139                 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
140         else if (sdata->vif.type == NL80211_IFTYPE_STATION)
141                 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
142
143         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
144                                           IEEE80211_STYPE_ACTION);
145
146         skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
147
148         mgmt->u.action.category = WLAN_CATEGORY_BACK;
149         mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
150         params = (u16)(initiator << 11);        /* bit 11 initiator */
151         params |= (u16)(tid << 12);             /* bit 15:12 TID number */
152
153         mgmt->u.action.u.delba.params = cpu_to_le16(params);
154         mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
155
156         ieee80211_tx_skb(sdata, skb);
157 }
158
159 void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
160                              struct sta_info *sta,
161                              struct ieee80211_mgmt *mgmt, size_t len)
162 {
163         u16 tid, params;
164         u16 initiator;
165
166         params = le16_to_cpu(mgmt->u.action.u.delba.params);
167         tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
168         initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
169
170 #ifdef CONFIG_MAC80211_HT_DEBUG
171         if (net_ratelimit())
172                 printk(KERN_DEBUG "delba from %pM (%s) tid %d reason code %d\n",
173                         mgmt->sa, initiator ? "initiator" : "recipient", tid,
174                         le16_to_cpu(mgmt->u.action.u.delba.reason_code));
175 #endif /* CONFIG_MAC80211_HT_DEBUG */
176
177         if (initiator == WLAN_BACK_INITIATOR)
178                 ieee80211_sta_stop_rx_ba_session(sdata, sta->sta.addr, tid,
179                                                  WLAN_BACK_INITIATOR, 0);
180         else { /* WLAN_BACK_RECIPIENT */
181                 spin_lock_bh(&sta->lock);
182                 if (sta->ampdu_mlme.tid_state_tx[tid] & HT_ADDBA_REQUESTED_MSK)
183                         ___ieee80211_stop_tx_ba_session(sta, tid,
184                                                         WLAN_BACK_RECIPIENT);
185                 spin_unlock_bh(&sta->lock);
186         }
187 }
188
189 int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata,
190                                enum ieee80211_smps_mode smps, const u8 *da,
191                                const u8 *bssid)
192 {
193         struct ieee80211_local *local = sdata->local;
194         struct sk_buff *skb;
195         struct ieee80211_mgmt *action_frame;
196
197         /* 27 = header + category + action + smps mode */
198         skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom);
199         if (!skb)
200                 return -ENOMEM;
201
202         skb_reserve(skb, local->hw.extra_tx_headroom);
203         action_frame = (void *)skb_put(skb, 27);
204         memcpy(action_frame->da, da, ETH_ALEN);
205         memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN);
206         memcpy(action_frame->bssid, bssid, ETH_ALEN);
207         action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
208                                                   IEEE80211_STYPE_ACTION);
209         action_frame->u.action.category = WLAN_CATEGORY_HT;
210         action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS;
211         switch (smps) {
212         case IEEE80211_SMPS_AUTOMATIC:
213         case IEEE80211_SMPS_NUM_MODES:
214                 WARN_ON(1);
215         case IEEE80211_SMPS_OFF:
216                 action_frame->u.action.u.ht_smps.smps_control =
217                                 WLAN_HT_SMPS_CONTROL_DISABLED;
218                 break;
219         case IEEE80211_SMPS_STATIC:
220                 action_frame->u.action.u.ht_smps.smps_control =
221                                 WLAN_HT_SMPS_CONTROL_STATIC;
222                 break;
223         case IEEE80211_SMPS_DYNAMIC:
224                 action_frame->u.action.u.ht_smps.smps_control =
225                                 WLAN_HT_SMPS_CONTROL_DYNAMIC;
226                 break;
227         }
228
229         /* we'll do more on status of this frame */
230         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
231         ieee80211_tx_skb(sdata, skb);
232
233         return 0;
234 }