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"
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;
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
43 ht_cap->cap = le16_to_cpu(ht_cap_ie->cap_info) &
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))
73 /* Counting from 0, therefore +1 */
74 if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF)
76 ((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
77 >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
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)
108 cancel_work_sync(&sta->ampdu_mlme.work);
110 for (i = 0; i < STA_TID_NUM; i++) {
111 __ieee80211_stop_tx_ba_session(sta, i, WLAN_BACK_INITIATOR);
112 __ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT,
113 WLAN_REASON_QSTA_LEAVE_QBSS);
117 void ieee80211_ba_session_work(struct work_struct *work)
119 struct sta_info *sta =
120 container_of(work, struct sta_info, ampdu_mlme.work);
121 struct tid_ampdu_tx *tid_tx;
125 * When this flag is set, new sessions should be
126 * blocked, and existing sessions will be torn
127 * down by the code that set the flag, so this
130 if (test_sta_flags(sta, WLAN_STA_BLOCK_BA))
133 spin_lock_bh(&sta->lock);
134 for (tid = 0; tid < STA_TID_NUM; tid++) {
135 tid_tx = sta->ampdu_mlme.tid_tx[tid];
139 if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state))
140 ieee80211_tx_ba_session_handle_start(sta, tid);
141 else if (test_and_clear_bit(HT_AGG_STATE_WANT_STOP,
143 ___ieee80211_stop_tx_ba_session(sta, tid,
144 WLAN_BACK_INITIATOR);
146 spin_unlock_bh(&sta->lock);
149 void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
150 const u8 *da, u16 tid,
151 u16 initiator, u16 reason_code)
153 struct ieee80211_local *local = sdata->local;
155 struct ieee80211_mgmt *mgmt;
158 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
161 printk(KERN_ERR "%s: failed to allocate buffer "
162 "for delba frame\n", sdata->name);
166 skb_reserve(skb, local->hw.extra_tx_headroom);
167 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
169 memcpy(mgmt->da, da, ETH_ALEN);
170 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
171 if (sdata->vif.type == NL80211_IFTYPE_AP ||
172 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
173 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
174 else if (sdata->vif.type == NL80211_IFTYPE_STATION)
175 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
177 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
178 IEEE80211_STYPE_ACTION);
180 skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
182 mgmt->u.action.category = WLAN_CATEGORY_BACK;
183 mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
184 params = (u16)(initiator << 11); /* bit 11 initiator */
185 params |= (u16)(tid << 12); /* bit 15:12 TID number */
187 mgmt->u.action.u.delba.params = cpu_to_le16(params);
188 mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
190 ieee80211_tx_skb(sdata, skb);
193 void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
194 struct sta_info *sta,
195 struct ieee80211_mgmt *mgmt, size_t len)
200 params = le16_to_cpu(mgmt->u.action.u.delba.params);
201 tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
202 initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
204 #ifdef CONFIG_MAC80211_HT_DEBUG
206 printk(KERN_DEBUG "delba from %pM (%s) tid %d reason code %d\n",
207 mgmt->sa, initiator ? "initiator" : "recipient", tid,
208 le16_to_cpu(mgmt->u.action.u.delba.reason_code));
209 #endif /* CONFIG_MAC80211_HT_DEBUG */
211 if (initiator == WLAN_BACK_INITIATOR)
212 __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0);
214 __ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_RECIPIENT);
217 int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata,
218 enum ieee80211_smps_mode smps, const u8 *da,
221 struct ieee80211_local *local = sdata->local;
223 struct ieee80211_mgmt *action_frame;
225 /* 27 = header + category + action + smps mode */
226 skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom);
230 skb_reserve(skb, local->hw.extra_tx_headroom);
231 action_frame = (void *)skb_put(skb, 27);
232 memcpy(action_frame->da, da, ETH_ALEN);
233 memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN);
234 memcpy(action_frame->bssid, bssid, ETH_ALEN);
235 action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
236 IEEE80211_STYPE_ACTION);
237 action_frame->u.action.category = WLAN_CATEGORY_HT;
238 action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS;
240 case IEEE80211_SMPS_AUTOMATIC:
241 case IEEE80211_SMPS_NUM_MODES:
243 case IEEE80211_SMPS_OFF:
244 action_frame->u.action.u.ht_smps.smps_control =
245 WLAN_HT_SMPS_CONTROL_DISABLED;
247 case IEEE80211_SMPS_STATIC:
248 action_frame->u.action.u.ht_smps.smps_control =
249 WLAN_HT_SMPS_CONTROL_STATIC;
251 case IEEE80211_SMPS_DYNAMIC:
252 action_frame->u.action.u.ht_smps.smps_control =
253 WLAN_HT_SMPS_CONTROL_DYNAMIC;
257 /* we'll do more on status of this frame */
258 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
259 ieee80211_tx_skb(sdata, skb);