ht.c 9.5 KB
Newer Older
1 2 3 4
/*
 * HT handling
 *
 * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
5 6
 * Copyright 2002-2005, Instant802 Networks, Inc.
 * Copyright 2005-2006, Devicescape Software, Inc.
7 8
 * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
9
 * Copyright 2007-2010, Intel Corporation
10 11 12 13 14 15 16 17 18
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/ieee80211.h>
#include <net/mac80211.h>
#include "ieee80211_i.h"
19
#include "rate.h"
20

J
Johannes Berg 已提交
21 22
void ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_supported_band *sband,
				       struct ieee80211_ht_cap *ht_cap_ie,
J
Johannes Berg 已提交
23
				       struct ieee80211_sta_ht_cap *ht_cap)
24
{
J
Johannes Berg 已提交
25 26
	u8 ampdu_info, tx_mcs_set_cap;
	int i, max_tx_streams;
27

J
Johannes Berg 已提交
28
	BUG_ON(!ht_cap);
29

J
Johannes Berg 已提交
30
	memset(ht_cap, 0, sizeof(*ht_cap));
31

32
	if (!ht_cap_ie || !sband->ht_cap.ht_supported)
J
Johannes Berg 已提交
33
		return;
J
Johannes Berg 已提交
34

J
Johannes Berg 已提交
35
	ht_cap->ht_supported = true;
J
Johannes Berg 已提交
36

J
Johannes Berg 已提交
37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58
	/*
	 * The bits listed in this expression should be
	 * the same for the peer and us, if the station
	 * advertises more then we can't use those thus
	 * we mask them out.
	 */
	ht_cap->cap = le16_to_cpu(ht_cap_ie->cap_info) &
		(sband->ht_cap.cap |
		 ~(IEEE80211_HT_CAP_LDPC_CODING |
		   IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
		   IEEE80211_HT_CAP_GRN_FLD |
		   IEEE80211_HT_CAP_SGI_20 |
		   IEEE80211_HT_CAP_SGI_40 |
		   IEEE80211_HT_CAP_DSSSCCK40));
	/*
	 * The STBC bits are asymmetric -- if we don't have
	 * TX then mask out the peer's RX and vice versa.
	 */
	if (!(sband->ht_cap.cap & IEEE80211_HT_CAP_TX_STBC))
		ht_cap->cap &= ~IEEE80211_HT_CAP_RX_STBC;
	if (!(sband->ht_cap.cap & IEEE80211_HT_CAP_RX_STBC))
		ht_cap->cap &= ~IEEE80211_HT_CAP_TX_STBC;
J
Johannes Berg 已提交
59

J
Johannes Berg 已提交
60 61 62 63 64
	ampdu_info = ht_cap_ie->ampdu_params_info;
	ht_cap->ampdu_factor =
		ampdu_info & IEEE80211_HT_AMPDU_PARM_FACTOR;
	ht_cap->ampdu_density =
		(ampdu_info & IEEE80211_HT_AMPDU_PARM_DENSITY) >> 2;
65

J
Johannes Berg 已提交
66 67 68
	/* own MCS TX capabilities */
	tx_mcs_set_cap = sband->ht_cap.mcs.tx_params;

69 70 71
	/* Copy peer MCS TX capabilities, the driver might need them. */
	ht_cap->mcs.tx_params = ht_cap_ie->mcs.tx_params;

J
Johannes Berg 已提交
72 73
	/* can we TX with MCS rates? */
	if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED))
J
Johannes Berg 已提交
74
		return;
J
Johannes Berg 已提交
75 76 77 78 79 80 81 82 83 84

	/* Counting from 0, therefore +1 */
	if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF)
		max_tx_streams =
			((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
				>> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
	else
		max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS;

	/*
85
	 * 802.11n-2009 20.3.5 / 20.6 says:
J
Johannes Berg 已提交
86 87 88 89 90 91
	 * - indices 0 to 7 and 32 are single spatial stream
	 * - 8 to 31 are multiple spatial streams using equal modulation
	 *   [8..15 for two streams, 16..23 for three and 24..31 for four]
	 * - remainder are multiple spatial streams using unequal modulation
	 */
	for (i = 0; i < max_tx_streams; i++)
J
Johannes Berg 已提交
92 93
		ht_cap->mcs.rx_mask[i] =
			sband->ht_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i];
J
Johannes Berg 已提交
94 95 96 97

	if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION)
		for (i = IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE;
		     i < IEEE80211_HT_MCS_MASK_LEN; i++)
J
Johannes Berg 已提交
98
			ht_cap->mcs.rx_mask[i] =
J
Johannes Berg 已提交
99
				sband->ht_cap.mcs.rx_mask[i] &
J
Johannes Berg 已提交
100
					ht_cap_ie->mcs.rx_mask[i];
J
Johannes Berg 已提交
101 102

	/* handle MCS rate 32 too */
J
Johannes Berg 已提交
103 104 105 106
	if (sband->ht_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1)
		ht_cap->mcs.rx_mask[32/8] |= 1;
}

107
void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta, bool tx)
108
{
J
Johannes Berg 已提交
109
	int i;
110

111 112
	cancel_work_sync(&sta->ampdu_mlme.work);

J
Johannes Berg 已提交
113
	for (i = 0; i <  STA_TID_NUM; i++) {
114
		__ieee80211_stop_tx_ba_session(sta, i, WLAN_BACK_INITIATOR, tx);
115
		__ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT,
116
					       WLAN_REASON_QSTA_LEAVE_QBSS, tx);
117 118 119
	}
}

J
Johannes Berg 已提交
120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135
void ieee80211_ba_session_work(struct work_struct *work)
{
	struct sta_info *sta =
		container_of(work, struct sta_info, ampdu_mlme.work);
	struct tid_ampdu_tx *tid_tx;
	int tid;

	/*
	 * When this flag is set, new sessions should be
	 * blocked, and existing sessions will be torn
	 * down by the code that set the flag, so this
	 * need not run.
	 */
	if (test_sta_flags(sta, WLAN_STA_BLOCK_BA))
		return;

136
	mutex_lock(&sta->ampdu_mlme.mtx);
J
Johannes Berg 已提交
137
	for (tid = 0; tid < STA_TID_NUM; tid++) {
138 139 140
		if (test_and_clear_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired))
			___ieee80211_stop_rx_ba_session(
				sta, tid, WLAN_BACK_RECIPIENT,
141
				WLAN_REASON_QSTA_TIMEOUT, true);
142

J
Johannes Berg 已提交
143 144 145 146 147 148 149 150 151 152 153 154 155 156 157
		tid_tx = sta->ampdu_mlme.tid_start_tx[tid];
		if (tid_tx) {
			/*
			 * Assign it over to the normal tid_tx array
			 * where it "goes live".
			 */
			spin_lock_bh(&sta->lock);

			sta->ampdu_mlme.tid_start_tx[tid] = NULL;
			/* could there be a race? */
			if (sta->ampdu_mlme.tid_tx[tid])
				kfree(tid_tx);
			else
				ieee80211_assign_tid_tx(sta, tid, tid_tx);
			spin_unlock_bh(&sta->lock);
J
Johannes Berg 已提交
158 159

			ieee80211_tx_ba_session_handle_start(sta, tid);
J
Johannes Berg 已提交
160 161 162
			continue;
		}

J
Johannes Berg 已提交
163
		tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
J
Johannes Berg 已提交
164 165
		if (tid_tx && test_and_clear_bit(HT_AGG_STATE_WANT_STOP,
						 &tid_tx->state))
J
Johannes Berg 已提交
166
			___ieee80211_stop_tx_ba_session(sta, tid,
167 168
							WLAN_BACK_INITIATOR,
							true);
J
Johannes Berg 已提交
169
	}
170
	mutex_unlock(&sta->ampdu_mlme.mtx);
J
Johannes Berg 已提交
171 172
}

J
Johannes Berg 已提交
173 174 175
void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
			  const u8 *da, u16 tid,
			  u16 initiator, u16 reason_code)
176 177 178 179 180 181 182 183 184 185
{
	struct ieee80211_local *local = sdata->local;
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
	u16 params;

	skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);

	if (!skb) {
		printk(KERN_ERR "%s: failed to allocate buffer "
186
					"for delba frame\n", sdata->name);
187 188 189 190 191 192 193
		return;
	}

	skb_reserve(skb, local->hw.extra_tx_headroom);
	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
	memset(mgmt, 0, 24);
	memcpy(mgmt->da, da, ETH_ALEN);
194
	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
195 196
	if (sdata->vif.type == NL80211_IFTYPE_AP ||
	    sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
197
		memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
198 199 200
	else if (sdata->vif.type == NL80211_IFTYPE_STATION)
		memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);

201 202 203 204 205 206 207 208 209 210 211 212 213
	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
					  IEEE80211_STYPE_ACTION);

	skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));

	mgmt->u.action.category = WLAN_CATEGORY_BACK;
	mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
	params = (u16)(initiator << 11); 	/* bit 11 initiator */
	params |= (u16)(tid << 12); 		/* bit 15:12 TID number */

	mgmt->u.action.u.delba.params = cpu_to_le16(params);
	mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);

214
	ieee80211_tx_skb(sdata, skb);
215 216
}

217 218 219 220 221 222 223 224 225 226 227 228 229
void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
			     struct sta_info *sta,
			     struct ieee80211_mgmt *mgmt, size_t len)
{
	u16 tid, params;
	u16 initiator;

	params = le16_to_cpu(mgmt->u.action.u.delba.params);
	tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
	initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;

#ifdef CONFIG_MAC80211_HT_DEBUG
	if (net_ratelimit())
230 231
		printk(KERN_DEBUG "delba from %pM (%s) tid %d reason code %d\n",
			mgmt->sa, initiator ? "initiator" : "recipient", tid,
232
			le16_to_cpu(mgmt->u.action.u.delba.reason_code));
233 234 235
#endif /* CONFIG_MAC80211_HT_DEBUG */

	if (initiator == WLAN_BACK_INITIATOR)
236 237
		__ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0,
					       true);
238
	else
239 240
		__ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_RECIPIENT,
					       true);
241
}
242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288

int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata,
			       enum ieee80211_smps_mode smps, const u8 *da,
			       const u8 *bssid)
{
	struct ieee80211_local *local = sdata->local;
	struct sk_buff *skb;
	struct ieee80211_mgmt *action_frame;

	/* 27 = header + category + action + smps mode */
	skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom);
	if (!skb)
		return -ENOMEM;

	skb_reserve(skb, local->hw.extra_tx_headroom);
	action_frame = (void *)skb_put(skb, 27);
	memcpy(action_frame->da, da, ETH_ALEN);
	memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN);
	memcpy(action_frame->bssid, bssid, ETH_ALEN);
	action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
						  IEEE80211_STYPE_ACTION);
	action_frame->u.action.category = WLAN_CATEGORY_HT;
	action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS;
	switch (smps) {
	case IEEE80211_SMPS_AUTOMATIC:
	case IEEE80211_SMPS_NUM_MODES:
		WARN_ON(1);
	case IEEE80211_SMPS_OFF:
		action_frame->u.action.u.ht_smps.smps_control =
				WLAN_HT_SMPS_CONTROL_DISABLED;
		break;
	case IEEE80211_SMPS_STATIC:
		action_frame->u.action.u.ht_smps.smps_control =
				WLAN_HT_SMPS_CONTROL_STATIC;
		break;
	case IEEE80211_SMPS_DYNAMIC:
		action_frame->u.action.u.ht_smps.smps_control =
				WLAN_HT_SMPS_CONTROL_DYNAMIC;
		break;
	}

	/* we'll do more on status of this frame */
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
	ieee80211_tx_skb(sdata, skb);

	return 0;
}
289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311

void ieee80211_request_smps_work(struct work_struct *work)
{
	struct ieee80211_sub_if_data *sdata =
		container_of(work, struct ieee80211_sub_if_data,
			     u.mgd.request_smps_work);

	mutex_lock(&sdata->u.mgd.mtx);
	__ieee80211_request_smps(sdata, sdata->u.mgd.driver_smps_mode);
	mutex_unlock(&sdata->u.mgd.mtx);
}

void ieee80211_request_smps(struct ieee80211_vif *vif,
			    enum ieee80211_smps_mode smps_mode)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);

	if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
		return;

	if (WARN_ON(smps_mode == IEEE80211_SMPS_OFF))
		smps_mode = IEEE80211_SMPS_AUTOMATIC;

J
Johannes Berg 已提交
312 313
	sdata->u.mgd.driver_smps_mode = smps_mode;

314 315 316 317 318
	ieee80211_queue_work(&sdata->local->hw,
			     &sdata->u.mgd.request_smps_work);
}
/* this might change ... don't want non-open drivers using it */
EXPORT_SYMBOL_GPL(ieee80211_request_smps);