blob: 75d679d75e63e92143d55a47601a1dfc1377ba03 [file] [log] [blame]
Johannes Berg44d414d2008-09-08 17:44:28 +02001/*
2 * HT handling
3 *
4 * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
Johannes Bergbacac542008-09-08 17:44:29 +02005 * Copyright 2002-2005, Instant802 Networks, Inc.
6 * Copyright 2005-2006, Devicescape Software, Inc.
Johannes Berg44d414d2008-09-08 17:44:28 +02007 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
8 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
Johannes Bergcfcdbde2010-06-10 10:21:48 +02009 * Copyright 2007-2010, Intel Corporation
Johannes Berg44d414d2008-09-08 17:44:28 +020010 *
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>
Johannes Berg44d414d2008-09-08 17:44:28 +020017#include <net/mac80211.h>
18#include "ieee80211_i.h"
Sujith81cb7622009-02-12 11:38:37 +053019#include "rate.h"
Johannes Berg44d414d2008-09-08 17:44:28 +020020
Johannes Bergae5eb022008-10-14 16:58:37 +020021void ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_supported_band *sband,
22 struct ieee80211_ht_cap *ht_cap_ie,
Johannes Bergd9fe60d2008-10-09 12:13:49 +020023 struct ieee80211_sta_ht_cap *ht_cap)
Johannes Berg44d414d2008-09-08 17:44:28 +020024{
Johannes Bergae5eb022008-10-14 16:58:37 +020025 u8 ampdu_info, tx_mcs_set_cap;
26 int i, max_tx_streams;
Johannes Berg44d414d2008-09-08 17:44:28 +020027
Johannes Bergd9fe60d2008-10-09 12:13:49 +020028 BUG_ON(!ht_cap);
Johannes Berg44d414d2008-09-08 17:44:28 +020029
Johannes Bergd9fe60d2008-10-09 12:13:49 +020030 memset(ht_cap, 0, sizeof(*ht_cap));
Johannes Berg44d414d2008-09-08 17:44:28 +020031
Christian Lamparter15804e32010-07-16 13:01:24 +020032 if (!ht_cap_ie || !sband->ht_cap.ht_supported)
Johannes Bergae5eb022008-10-14 16:58:37 +020033 return;
Johannes Berg44d414d2008-09-08 17:44:28 +020034
Johannes Bergae5eb022008-10-14 16:58:37 +020035 ht_cap->ht_supported = true;
Johannes Berg44d414d2008-09-08 17:44:28 +020036
Johannes Berg9a418af2009-12-17 13:55:48 +010037 /*
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.
42 */
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));
51 /*
52 * The STBC bits are asymmetric -- if we don't have
53 * TX then mask out the peer's RX and vice versa.
54 */
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;
Johannes Berg44d414d2008-09-08 17:44:28 +020059
Johannes Bergae5eb022008-10-14 16:58:37 +020060 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;
Johannes Bergd9fe60d2008-10-09 12:13:49 +020065
66 /* own MCS TX capabilities */
67 tx_mcs_set_cap = sband->ht_cap.mcs.tx_params;
68
Johannes Bergd9fe60d2008-10-09 12:13:49 +020069 /* can we TX with MCS rates? */
70 if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED))
Johannes Bergae5eb022008-10-14 16:58:37 +020071 return;
Johannes Bergd9fe60d2008-10-09 12:13:49 +020072
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;
80
81 /*
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
87 */
88 for (i = 0; i < max_tx_streams; i++)
Johannes Bergae5eb022008-10-14 16:58:37 +020089 ht_cap->mcs.rx_mask[i] =
90 sband->ht_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i];
Johannes Bergd9fe60d2008-10-09 12:13:49 +020091
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++)
Johannes Bergae5eb022008-10-14 16:58:37 +020095 ht_cap->mcs.rx_mask[i] =
Johannes Bergd9fe60d2008-10-09 12:13:49 +020096 sband->ht_cap.mcs.rx_mask[i] &
Johannes Bergae5eb022008-10-14 16:58:37 +020097 ht_cap_ie->mcs.rx_mask[i];
Johannes Bergd9fe60d2008-10-09 12:13:49 +020098
99 /* handle MCS rate 32 too */
Johannes Bergae5eb022008-10-14 16:58:37 +0200100 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;
102}
Johannes Bergd9fe60d2008-10-09 12:13:49 +0200103
Johannes Berg53f73c02010-10-05 19:37:40 +0200104void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta, bool tx)
Johannes Berg44d414d2008-09-08 17:44:28 +0200105{
Johannes Bergb8695a82009-02-10 21:25:46 +0100106 int i;
Johannes Berg44d414d2008-09-08 17:44:28 +0200107
Johannes Berg0ab33702010-06-10 10:21:42 +0200108 cancel_work_sync(&sta->ampdu_mlme.work);
109
Johannes Bergb8695a82009-02-10 21:25:46 +0100110 for (i = 0; i < STA_TID_NUM; i++) {
Johannes Berg53f73c02010-10-05 19:37:40 +0200111 __ieee80211_stop_tx_ba_session(sta, i, WLAN_BACK_INITIATOR, tx);
Johannes Berg849b7962009-02-10 21:25:54 +0100112 __ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT,
Johannes Berg53f73c02010-10-05 19:37:40 +0200113 WLAN_REASON_QSTA_LEAVE_QBSS, tx);
Johannes Berg44d414d2008-09-08 17:44:28 +0200114 }
Johannes Berg44d414d2008-09-08 17:44:28 +0200115}
116
Johannes Berg67c282c2010-06-10 10:21:43 +0200117void ieee80211_ba_session_work(struct work_struct *work)
118{
119 struct sta_info *sta =
120 container_of(work, struct sta_info, ampdu_mlme.work);
121 struct tid_ampdu_tx *tid_tx;
122 int tid;
123
124 /*
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
128 * need not run.
129 */
130 if (test_sta_flags(sta, WLAN_STA_BLOCK_BA))
131 return;
132
Johannes Berga93e3642010-06-10 10:21:46 +0200133 mutex_lock(&sta->ampdu_mlme.mtx);
Johannes Berg67c282c2010-06-10 10:21:43 +0200134 for (tid = 0; tid < STA_TID_NUM; tid++) {
Johannes Berg7c3b1dd2010-06-10 10:21:44 +0200135 if (test_and_clear_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired))
136 ___ieee80211_stop_rx_ba_session(
137 sta, tid, WLAN_BACK_RECIPIENT,
Johannes Berg53f73c02010-10-05 19:37:40 +0200138 WLAN_REASON_QSTA_TIMEOUT, true);
Johannes Berg7c3b1dd2010-06-10 10:21:44 +0200139
Johannes Berg67c282c2010-06-10 10:21:43 +0200140 tid_tx = sta->ampdu_mlme.tid_tx[tid];
141 if (!tid_tx)
142 continue;
143
144 if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state))
145 ieee80211_tx_ba_session_handle_start(sta, tid);
146 else if (test_and_clear_bit(HT_AGG_STATE_WANT_STOP,
147 &tid_tx->state))
148 ___ieee80211_stop_tx_ba_session(sta, tid,
Johannes Berg53f73c02010-10-05 19:37:40 +0200149 WLAN_BACK_INITIATOR,
150 true);
Johannes Berg67c282c2010-06-10 10:21:43 +0200151 }
Johannes Bergcfcdbde2010-06-10 10:21:48 +0200152 mutex_unlock(&sta->ampdu_mlme.mtx);
Johannes Berg67c282c2010-06-10 10:21:43 +0200153}
154
Johannes Bergb8695a82009-02-10 21:25:46 +0100155void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
156 const u8 *da, u16 tid,
157 u16 initiator, u16 reason_code)
Johannes Berg44d414d2008-09-08 17:44:28 +0200158{
159 struct ieee80211_local *local = sdata->local;
Johannes Berg44d414d2008-09-08 17:44:28 +0200160 struct sk_buff *skb;
161 struct ieee80211_mgmt *mgmt;
162 u16 params;
163
164 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
165
166 if (!skb) {
167 printk(KERN_ERR "%s: failed to allocate buffer "
Johannes Berg47846c92009-11-25 17:46:19 +0100168 "for delba frame\n", sdata->name);
Johannes Berg44d414d2008-09-08 17:44:28 +0200169 return;
170 }
171
172 skb_reserve(skb, local->hw.extra_tx_headroom);
173 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
174 memset(mgmt, 0, 24);
175 memcpy(mgmt->da, da, ETH_ALEN);
Johannes Berg47846c92009-11-25 17:46:19 +0100176 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
Johannes Berg8abd3f92009-02-10 21:25:47 +0100177 if (sdata->vif.type == NL80211_IFTYPE_AP ||
178 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
Johannes Berg47846c92009-11-25 17:46:19 +0100179 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
Johannes Berg46900292009-02-15 12:44:28 +0100180 else if (sdata->vif.type == NL80211_IFTYPE_STATION)
181 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
182
Johannes Berg44d414d2008-09-08 17:44:28 +0200183 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
184 IEEE80211_STYPE_ACTION);
185
186 skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
187
188 mgmt->u.action.category = WLAN_CATEGORY_BACK;
189 mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
190 params = (u16)(initiator << 11); /* bit 11 initiator */
191 params |= (u16)(tid << 12); /* bit 15:12 TID number */
192
193 mgmt->u.action.u.delba.params = cpu_to_le16(params);
194 mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
195
Johannes Berg62ae67b2009-11-18 18:42:05 +0100196 ieee80211_tx_skb(sdata, skb);
Johannes Berg44d414d2008-09-08 17:44:28 +0200197}
198
Johannes Bergde1ede7a2008-09-09 14:42:50 +0200199void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
200 struct sta_info *sta,
201 struct ieee80211_mgmt *mgmt, size_t len)
202{
Johannes Bergde1ede7a2008-09-09 14:42:50 +0200203 u16 tid, params;
204 u16 initiator;
Johannes Bergde1ede7a2008-09-09 14:42:50 +0200205
206 params = le16_to_cpu(mgmt->u.action.u.delba.params);
207 tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
208 initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
209
210#ifdef CONFIG_MAC80211_HT_DEBUG
211 if (net_ratelimit())
Johannes Berg0c68ae262008-10-27 15:56:10 -0700212 printk(KERN_DEBUG "delba from %pM (%s) tid %d reason code %d\n",
213 mgmt->sa, initiator ? "initiator" : "recipient", tid,
Johannes Berg372362a2009-10-29 10:09:28 +0100214 le16_to_cpu(mgmt->u.action.u.delba.reason_code));
Johannes Bergde1ede7a2008-09-09 14:42:50 +0200215#endif /* CONFIG_MAC80211_HT_DEBUG */
216
217 if (initiator == WLAN_BACK_INITIATOR)
Johannes Berg53f73c02010-10-05 19:37:40 +0200218 __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0,
219 true);
Johannes Berga622ab72010-06-10 10:21:39 +0200220 else
Johannes Berg53f73c02010-10-05 19:37:40 +0200221 __ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_RECIPIENT,
222 true);
Johannes Bergde1ede7a2008-09-09 14:42:50 +0200223}
Johannes Berg0f782312009-12-01 13:37:02 +0100224
225int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata,
226 enum ieee80211_smps_mode smps, const u8 *da,
227 const u8 *bssid)
228{
229 struct ieee80211_local *local = sdata->local;
230 struct sk_buff *skb;
231 struct ieee80211_mgmt *action_frame;
232
233 /* 27 = header + category + action + smps mode */
234 skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom);
235 if (!skb)
236 return -ENOMEM;
237
238 skb_reserve(skb, local->hw.extra_tx_headroom);
239 action_frame = (void *)skb_put(skb, 27);
240 memcpy(action_frame->da, da, ETH_ALEN);
241 memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN);
242 memcpy(action_frame->bssid, bssid, ETH_ALEN);
243 action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
244 IEEE80211_STYPE_ACTION);
245 action_frame->u.action.category = WLAN_CATEGORY_HT;
246 action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS;
247 switch (smps) {
248 case IEEE80211_SMPS_AUTOMATIC:
249 case IEEE80211_SMPS_NUM_MODES:
250 WARN_ON(1);
251 case IEEE80211_SMPS_OFF:
252 action_frame->u.action.u.ht_smps.smps_control =
253 WLAN_HT_SMPS_CONTROL_DISABLED;
254 break;
255 case IEEE80211_SMPS_STATIC:
256 action_frame->u.action.u.ht_smps.smps_control =
257 WLAN_HT_SMPS_CONTROL_STATIC;
258 break;
259 case IEEE80211_SMPS_DYNAMIC:
260 action_frame->u.action.u.ht_smps.smps_control =
261 WLAN_HT_SMPS_CONTROL_DYNAMIC;
262 break;
263 }
264
265 /* we'll do more on status of this frame */
266 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
267 ieee80211_tx_skb(sdata, skb);
268
269 return 0;
270}
Johannes Bergd1f5b7a2010-08-05 17:05:55 +0200271
272void ieee80211_request_smps_work(struct work_struct *work)
273{
274 struct ieee80211_sub_if_data *sdata =
275 container_of(work, struct ieee80211_sub_if_data,
276 u.mgd.request_smps_work);
277
278 mutex_lock(&sdata->u.mgd.mtx);
279 __ieee80211_request_smps(sdata, sdata->u.mgd.driver_smps_mode);
280 mutex_unlock(&sdata->u.mgd.mtx);
281}
282
283void ieee80211_request_smps(struct ieee80211_vif *vif,
284 enum ieee80211_smps_mode smps_mode)
285{
286 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
287
288 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
289 return;
290
291 if (WARN_ON(smps_mode == IEEE80211_SMPS_OFF))
292 smps_mode = IEEE80211_SMPS_AUTOMATIC;
293
Johannes Berge4b55952010-10-13 19:23:21 +0200294 sdata->u.mgd.driver_smps_mode = smps_mode;
295
Johannes Bergd1f5b7a2010-08-05 17:05:55 +0200296 ieee80211_queue_work(&sdata->local->hw,
297 &sdata->u.mgd.request_smps_work);
298}
299/* this might change ... don't want non-open drivers using it */
300EXPORT_SYMBOL_GPL(ieee80211_request_smps);