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"
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;
30 memset(ht_cap, 0, sizeof(*ht_cap));
35 ht_cap->ht_supported = true;
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;
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;
47 /* own MCS TX capabilities */
48 tx_mcs_set_cap = sband->ht_cap.mcs.tx_params;
50 /* can we TX with MCS rates? */
51 if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED))
54 /* Counting from 0, therefore +1 */
55 if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF)
57 ((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
58 >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
60 max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS;
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
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];
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];
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;
86 * ieee80211_enable_ht should be called only after the operating band
87 * has been determined as ht configuration depends on the hw's
88 * HT abilities for a specific band.
90 u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
91 struct ieee80211_ht_info *hti,
94 struct ieee80211_local *local = sdata->local;
95 struct ieee80211_supported_band *sband;
96 struct ieee80211_bss_ht_conf ht;
98 bool enable_ht = true, ht_changed;
99 enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
101 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
103 memset(&ht, 0, sizeof(ht));
105 /* HT is not supported */
106 if (!sband->ht_cap.ht_supported)
109 /* check that channel matches the right operating channel */
110 if (local->hw.conf.channel->center_freq !=
111 ieee80211_channel_to_frequency(hti->control_chan))
115 channel_type = NL80211_CHAN_HT20;
117 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
118 (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
119 (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
120 switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
121 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
122 channel_type = NL80211_CHAN_HT40PLUS;
124 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
125 channel_type = NL80211_CHAN_HT40MINUS;
131 ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
132 channel_type != local->hw.conf.channel_type;
134 local->oper_channel_type = channel_type;
137 /* channel_type change automatically detected */
138 ieee80211_hw_config(local, 0);
145 ht.operation_mode = le16_to_cpu(hti->operation_mode);
147 /* if bss configuration changed store the new one */
148 if (memcmp(&sdata->vif.bss_conf.ht, &ht, sizeof(ht))) {
149 changed |= BSS_CHANGED_HT;
150 sdata->vif.bss_conf.ht = ht;
156 void ieee80211_sta_tear_down_BA_sessions(struct ieee80211_sub_if_data *sdata, u8 *addr)
158 struct ieee80211_local *local = sdata->local;
161 for (i = 0; i < STA_TID_NUM; i++) {
162 ieee80211_stop_tx_ba_session(&local->hw, addr, i,
163 WLAN_BACK_INITIATOR);
164 ieee80211_sta_stop_rx_ba_session(sdata, addr, i,
166 WLAN_REASON_QSTA_LEAVE_QBSS);
170 void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
171 const u8 *da, u16 tid,
172 u16 initiator, u16 reason_code)
174 struct ieee80211_local *local = sdata->local;
175 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
177 struct ieee80211_mgmt *mgmt;
180 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
183 printk(KERN_ERR "%s: failed to allocate buffer "
184 "for delba frame\n", sdata->dev->name);
188 skb_reserve(skb, local->hw.extra_tx_headroom);
189 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
191 memcpy(mgmt->da, da, ETH_ALEN);
192 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
193 if (sdata->vif.type == NL80211_IFTYPE_AP ||
194 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
195 memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
197 memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
198 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
199 IEEE80211_STYPE_ACTION);
201 skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
203 mgmt->u.action.category = WLAN_CATEGORY_BACK;
204 mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
205 params = (u16)(initiator << 11); /* bit 11 initiator */
206 params |= (u16)(tid << 12); /* bit 15:12 TID number */
208 mgmt->u.action.u.delba.params = cpu_to_le16(params);
209 mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
211 ieee80211_tx_skb(sdata, skb, 1);
214 void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
215 struct sta_info *sta,
216 struct ieee80211_mgmt *mgmt, size_t len)
218 struct ieee80211_local *local = sdata->local;
222 params = le16_to_cpu(mgmt->u.action.u.delba.params);
223 tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
224 initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
226 #ifdef CONFIG_MAC80211_HT_DEBUG
228 printk(KERN_DEBUG "delba from %pM (%s) tid %d reason code %d\n",
229 mgmt->sa, initiator ? "initiator" : "recipient", tid,
230 mgmt->u.action.u.delba.reason_code);
231 #endif /* CONFIG_MAC80211_HT_DEBUG */
233 if (initiator == WLAN_BACK_INITIATOR)
234 ieee80211_sta_stop_rx_ba_session(sdata, sta->sta.addr, tid,
235 WLAN_BACK_INITIATOR, 0);
236 else { /* WLAN_BACK_RECIPIENT */
237 spin_lock_bh(&sta->lock);
238 sta->ampdu_mlme.tid_state_tx[tid] =
239 HT_AGG_STATE_OPERATIONAL;
240 spin_unlock_bh(&sta->lock);
241 ieee80211_stop_tx_ba_session(&local->hw, sta->sta.addr, tid,
242 WLAN_BACK_RECIPIENT);