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/wireless.h>
18 #include <net/mac80211.h>
19 #include "ieee80211_i.h"
22 void ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_supported_band *sband,
23 struct ieee80211_ht_cap *ht_cap_ie,
24 struct ieee80211_sta_ht_cap *ht_cap)
26 u8 ampdu_info, tx_mcs_set_cap;
27 int i, max_tx_streams;
31 memset(ht_cap, 0, sizeof(*ht_cap));
36 ht_cap->ht_supported = true;
38 ht_cap->cap = le16_to_cpu(ht_cap_ie->cap_info) & sband->ht_cap.cap;
39 ht_cap->cap &= ~IEEE80211_HT_CAP_SM_PS;
40 ht_cap->cap |= sband->ht_cap.cap & IEEE80211_HT_CAP_SM_PS;
42 ampdu_info = ht_cap_ie->ampdu_params_info;
43 ht_cap->ampdu_factor =
44 ampdu_info & IEEE80211_HT_AMPDU_PARM_FACTOR;
45 ht_cap->ampdu_density =
46 (ampdu_info & IEEE80211_HT_AMPDU_PARM_DENSITY) >> 2;
48 /* own MCS TX capabilities */
49 tx_mcs_set_cap = sband->ht_cap.mcs.tx_params;
51 /* can we TX with MCS rates? */
52 if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED))
55 /* Counting from 0, therefore +1 */
56 if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF)
58 ((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
59 >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
61 max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS;
64 * 802.11n D5.0 20.3.5 / 20.6 says:
65 * - indices 0 to 7 and 32 are single spatial stream
66 * - 8 to 31 are multiple spatial streams using equal modulation
67 * [8..15 for two streams, 16..23 for three and 24..31 for four]
68 * - remainder are multiple spatial streams using unequal modulation
70 for (i = 0; i < max_tx_streams; i++)
71 ht_cap->mcs.rx_mask[i] =
72 sband->ht_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i];
74 if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION)
75 for (i = IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE;
76 i < IEEE80211_HT_MCS_MASK_LEN; i++)
77 ht_cap->mcs.rx_mask[i] =
78 sband->ht_cap.mcs.rx_mask[i] &
79 ht_cap_ie->mcs.rx_mask[i];
81 /* handle MCS rate 32 too */
82 if (sband->ht_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1)
83 ht_cap->mcs.rx_mask[32/8] |= 1;
86 void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta)
90 for (i = 0; i < STA_TID_NUM; i++) {
91 __ieee80211_stop_tx_ba_session(sta, i, WLAN_BACK_INITIATOR);
92 __ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT,
93 WLAN_REASON_QSTA_LEAVE_QBSS);
97 void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
98 const u8 *da, u16 tid,
99 u16 initiator, u16 reason_code)
101 struct ieee80211_local *local = sdata->local;
103 struct ieee80211_mgmt *mgmt;
106 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
109 printk(KERN_ERR "%s: failed to allocate buffer "
110 "for delba frame\n", sdata->dev->name);
114 skb_reserve(skb, local->hw.extra_tx_headroom);
115 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
117 memcpy(mgmt->da, da, ETH_ALEN);
118 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
119 if (sdata->vif.type == NL80211_IFTYPE_AP ||
120 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
121 memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
122 else if (sdata->vif.type == NL80211_IFTYPE_STATION)
123 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
125 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
126 IEEE80211_STYPE_ACTION);
128 skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
130 mgmt->u.action.category = WLAN_CATEGORY_BACK;
131 mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
132 params = (u16)(initiator << 11); /* bit 11 initiator */
133 params |= (u16)(tid << 12); /* bit 15:12 TID number */
135 mgmt->u.action.u.delba.params = cpu_to_le16(params);
136 mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
138 ieee80211_tx_skb(sdata, skb, 1);
141 void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
142 struct sta_info *sta,
143 struct ieee80211_mgmt *mgmt, size_t len)
145 struct ieee80211_local *local = sdata->local;
149 params = le16_to_cpu(mgmt->u.action.u.delba.params);
150 tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
151 initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
153 #ifdef CONFIG_MAC80211_HT_DEBUG
155 printk(KERN_DEBUG "delba from %pM (%s) tid %d reason code %d\n",
156 mgmt->sa, initiator ? "initiator" : "recipient", tid,
157 mgmt->u.action.u.delba.reason_code);
158 #endif /* CONFIG_MAC80211_HT_DEBUG */
160 if (initiator == WLAN_BACK_INITIATOR)
161 ieee80211_sta_stop_rx_ba_session(sdata, sta->sta.addr, tid,
162 WLAN_BACK_INITIATOR, 0);
163 else { /* WLAN_BACK_RECIPIENT */
164 spin_lock_bh(&sta->lock);
165 sta->ampdu_mlme.tid_state_tx[tid] =
166 HT_AGG_STATE_OPERATIONAL;
167 spin_unlock_bh(&sta->lock);
168 ieee80211_stop_tx_ba_session(&local->hw, sta->sta.addr, tid,
169 WLAN_BACK_RECIPIENT);