vmalloc: remove BUG_ON due to racy counting of VM_LAZY_FREE
[linux-2.6/linux-2.6-openrd.git] / net / mac80211 / ht.c
blobd7dcee68072820764d0910c79e740db052512073
1 /*
2 * HT handling
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
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.
16 #include <linux/ieee80211.h>
17 #include <net/mac80211.h>
18 #include "ieee80211_i.h"
19 #include "rate.h"
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)
25 u8 ampdu_info, tx_mcs_set_cap;
26 int i, max_tx_streams;
28 BUG_ON(!ht_cap);
30 memset(ht_cap, 0, sizeof(*ht_cap));
32 if (!ht_cap_ie)
33 return;
35 ht_cap->ht_supported = true;
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.
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));
52 * The STBC bits are asymmetric -- if we don't have
53 * TX then mask out the peer's RX and vice versa.
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;
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;
66 /* own MCS TX capabilities */
67 tx_mcs_set_cap = sband->ht_cap.mcs.tx_params;
69 /* can we TX with MCS rates? */
70 if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED))
71 return;
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;
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
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];
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];
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;
104 void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta)
106 int i;
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);
115 void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
116 const u8 *da, u16 tid,
117 u16 initiator, u16 reason_code)
119 struct ieee80211_local *local = sdata->local;
120 struct sk_buff *skb;
121 struct ieee80211_mgmt *mgmt;
122 u16 params;
124 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
126 if (!skb) {
127 printk(KERN_ERR "%s: failed to allocate buffer "
128 "for delba frame\n", sdata->dev->name);
129 return;
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->dev->dev_addr, ETH_ALEN);
137 if (sdata->vif.type == NL80211_IFTYPE_AP ||
138 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
139 memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
140 else if (sdata->vif.type == NL80211_IFTYPE_STATION)
141 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
143 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
144 IEEE80211_STYPE_ACTION);
146 skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
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 */
153 mgmt->u.action.u.delba.params = cpu_to_le16(params);
154 mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
156 ieee80211_tx_skb(sdata, skb);
159 void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
160 struct sta_info *sta,
161 struct ieee80211_mgmt *mgmt, size_t len)
163 u16 tid, params;
164 u16 initiator;
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;
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 */
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);