48ef1a282b91b8f1cf0bf9c3149c6b66a0467c2a
[sfrench/cifs-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 2007-2008, 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         ht_cap->cap = le16_to_cpu(ht_cap_ie->cap_info) & sband->ht_cap.cap;
38         ht_cap->cap &= ~IEEE80211_HT_CAP_SM_PS;
39         ht_cap->cap |= sband->ht_cap.cap & IEEE80211_HT_CAP_SM_PS;
40
41         ampdu_info = ht_cap_ie->ampdu_params_info;
42         ht_cap->ampdu_factor =
43                 ampdu_info & IEEE80211_HT_AMPDU_PARM_FACTOR;
44         ht_cap->ampdu_density =
45                 (ampdu_info & IEEE80211_HT_AMPDU_PARM_DENSITY) >> 2;
46
47         /* own MCS TX capabilities */
48         tx_mcs_set_cap = sband->ht_cap.mcs.tx_params;
49
50         /* can we TX with MCS rates? */
51         if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED))
52                 return;
53
54         /* Counting from 0, therefore +1 */
55         if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF)
56                 max_tx_streams =
57                         ((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
58                                 >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
59         else
60                 max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS;
61
62         /*
63          * 802.11n D5.0 20.3.5 / 20.6 says:
64          * - indices 0 to 7 and 32 are single spatial stream
65          * - 8 to 31 are multiple spatial streams using equal modulation
66          *   [8..15 for two streams, 16..23 for three and 24..31 for four]
67          * - remainder are multiple spatial streams using unequal modulation
68          */
69         for (i = 0; i < max_tx_streams; i++)
70                 ht_cap->mcs.rx_mask[i] =
71                         sband->ht_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i];
72
73         if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION)
74                 for (i = IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE;
75                      i < IEEE80211_HT_MCS_MASK_LEN; i++)
76                         ht_cap->mcs.rx_mask[i] =
77                                 sband->ht_cap.mcs.rx_mask[i] &
78                                         ht_cap_ie->mcs.rx_mask[i];
79
80         /* handle MCS rate 32 too */
81         if (sband->ht_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1)
82                 ht_cap->mcs.rx_mask[32/8] |= 1;
83 }
84
85 void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta)
86 {
87         int i;
88
89         for (i = 0; i <  STA_TID_NUM; i++) {
90                 __ieee80211_stop_tx_ba_session(sta, i, WLAN_BACK_INITIATOR);
91                 __ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT,
92                                                WLAN_REASON_QSTA_LEAVE_QBSS);
93         }
94 }
95
96 void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
97                           const u8 *da, u16 tid,
98                           u16 initiator, u16 reason_code)
99 {
100         struct ieee80211_local *local = sdata->local;
101         struct sk_buff *skb;
102         struct ieee80211_mgmt *mgmt;
103         u16 params;
104
105         skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
106
107         if (!skb) {
108                 printk(KERN_ERR "%s: failed to allocate buffer "
109                                         "for delba frame\n", sdata->dev->name);
110                 return;
111         }
112
113         skb_reserve(skb, local->hw.extra_tx_headroom);
114         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
115         memset(mgmt, 0, 24);
116         memcpy(mgmt->da, da, ETH_ALEN);
117         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
118         if (sdata->vif.type == NL80211_IFTYPE_AP ||
119             sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
120                 memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
121         else if (sdata->vif.type == NL80211_IFTYPE_STATION)
122                 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
123
124         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
125                                           IEEE80211_STYPE_ACTION);
126
127         skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
128
129         mgmt->u.action.category = WLAN_CATEGORY_BACK;
130         mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
131         params = (u16)(initiator << 11);        /* bit 11 initiator */
132         params |= (u16)(tid << 12);             /* bit 15:12 TID number */
133
134         mgmt->u.action.u.delba.params = cpu_to_le16(params);
135         mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
136
137         ieee80211_tx_skb(sdata, skb, 1);
138 }
139
140 void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
141                              struct sta_info *sta,
142                              struct ieee80211_mgmt *mgmt, size_t len)
143 {
144         struct ieee80211_local *local = sdata->local;
145         u16 tid, params;
146         u16 initiator;
147
148         params = le16_to_cpu(mgmt->u.action.u.delba.params);
149         tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
150         initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
151
152 #ifdef CONFIG_MAC80211_HT_DEBUG
153         if (net_ratelimit())
154                 printk(KERN_DEBUG "delba from %pM (%s) tid %d reason code %d\n",
155                         mgmt->sa, initiator ? "initiator" : "recipient", tid,
156                         le16_to_cpu(mgmt->u.action.u.delba.reason_code));
157 #endif /* CONFIG_MAC80211_HT_DEBUG */
158
159         if (initiator == WLAN_BACK_INITIATOR)
160                 ieee80211_sta_stop_rx_ba_session(sdata, sta->sta.addr, tid,
161                                                  WLAN_BACK_INITIATOR, 0);
162         else { /* WLAN_BACK_RECIPIENT */
163                 spin_lock_bh(&sta->lock);
164                 sta->ampdu_mlme.tid_state_tx[tid] =
165                                 HT_AGG_STATE_OPERATIONAL;
166                 spin_unlock_bh(&sta->lock);
167                 ieee80211_stop_tx_ba_session(&local->hw, sta->sta.addr, tid,
168                                              WLAN_BACK_RECIPIENT);
169         }
170 }