blob: bb677a73b7c9d67a623e962ad9419231bb11e3f4 [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>
9 * Copyright 2007-2008, Intel Corporation
10 *
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
Johannes Bergae5eb022008-10-14 16:58:37 +020032 if (!ht_cap_ie)
33 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 Berg2dace102009-02-10 21:25:52 +0100104void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta)
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 Bergb8695a82009-02-10 21:25:46 +0100108 for (i = 0; i < STA_TID_NUM; i++) {
Johannes Berg849b7962009-02-10 21:25:54 +0100109 __ieee80211_stop_tx_ba_session(sta, i, WLAN_BACK_INITIATOR);
110 __ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT,
111 WLAN_REASON_QSTA_LEAVE_QBSS);
Johannes Berg44d414d2008-09-08 17:44:28 +0200112 }
Johannes Berg44d414d2008-09-08 17:44:28 +0200113}
114
Johannes Bergb8695a82009-02-10 21:25:46 +0100115void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
116 const u8 *da, u16 tid,
117 u16 initiator, u16 reason_code)
Johannes Berg44d414d2008-09-08 17:44:28 +0200118{
119 struct ieee80211_local *local = sdata->local;
Johannes Berg44d414d2008-09-08 17:44:28 +0200120 struct sk_buff *skb;
121 struct ieee80211_mgmt *mgmt;
122 u16 params;
123
124 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
125
126 if (!skb) {
127 printk(KERN_ERR "%s: failed to allocate buffer "
Johannes Berg47846c92009-11-25 17:46:19 +0100128 "for delba frame\n", sdata->name);
Johannes Berg44d414d2008-09-08 17:44:28 +0200129 return;
130 }
131
132 skb_reserve(skb, local->hw.extra_tx_headroom);
133 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
134 memset(mgmt, 0, 24);
135 memcpy(mgmt->da, da, ETH_ALEN);
Johannes Berg47846c92009-11-25 17:46:19 +0100136 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
Johannes Berg8abd3f92009-02-10 21:25:47 +0100137 if (sdata->vif.type == NL80211_IFTYPE_AP ||
138 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
Johannes Berg47846c92009-11-25 17:46:19 +0100139 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
Johannes Berg46900292009-02-15 12:44:28 +0100140 else if (sdata->vif.type == NL80211_IFTYPE_STATION)
141 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
142
Johannes Berg44d414d2008-09-08 17:44:28 +0200143 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
144 IEEE80211_STYPE_ACTION);
145
146 skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
147
148 mgmt->u.action.category = WLAN_CATEGORY_BACK;
149 mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
150 params = (u16)(initiator << 11); /* bit 11 initiator */
151 params |= (u16)(tid << 12); /* bit 15:12 TID number */
152
153 mgmt->u.action.u.delba.params = cpu_to_le16(params);
154 mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
155
Johannes Berg62ae67b2009-11-18 18:42:05 +0100156 ieee80211_tx_skb(sdata, skb);
Johannes Berg44d414d2008-09-08 17:44:28 +0200157}
158
Johannes Bergde1ede72008-09-09 14:42:50 +0200159void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
160 struct sta_info *sta,
161 struct ieee80211_mgmt *mgmt, size_t len)
162{
Johannes Bergde1ede72008-09-09 14:42:50 +0200163 u16 tid, params;
164 u16 initiator;
Johannes Bergde1ede72008-09-09 14:42:50 +0200165
166 params = le16_to_cpu(mgmt->u.action.u.delba.params);
167 tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
168 initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
169
170#ifdef CONFIG_MAC80211_HT_DEBUG
171 if (net_ratelimit())
Johannes Berg0c68ae262008-10-27 15:56:10 -0700172 printk(KERN_DEBUG "delba from %pM (%s) tid %d reason code %d\n",
173 mgmt->sa, initiator ? "initiator" : "recipient", tid,
Johannes Berg372362a2009-10-29 10:09:28 +0100174 le16_to_cpu(mgmt->u.action.u.delba.reason_code));
Johannes Bergde1ede72008-09-09 14:42:50 +0200175#endif /* CONFIG_MAC80211_HT_DEBUG */
176
177 if (initiator == WLAN_BACK_INITIATOR)
Johannes Berg17741cd2008-09-11 00:02:02 +0200178 ieee80211_sta_stop_rx_ba_session(sdata, sta->sta.addr, tid,
Johannes Bergde1ede72008-09-09 14:42:50 +0200179 WLAN_BACK_INITIATOR, 0);
180 else { /* WLAN_BACK_RECIPIENT */
181 spin_lock_bh(&sta->lock);
Johannes Berg827d42c2009-11-22 12:28:41 +0100182 if (sta->ampdu_mlme.tid_state_tx[tid] & HT_ADDBA_REQUESTED_MSK)
183 ___ieee80211_stop_tx_ba_session(sta, tid,
184 WLAN_BACK_RECIPIENT);
Johannes Bergde1ede72008-09-09 14:42:50 +0200185 spin_unlock_bh(&sta->lock);
Johannes Bergde1ede72008-09-09 14:42:50 +0200186 }
187}
Johannes Berg0f782312009-12-01 13:37:02 +0100188
189int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata,
190 enum ieee80211_smps_mode smps, const u8 *da,
191 const u8 *bssid)
192{
193 struct ieee80211_local *local = sdata->local;
194 struct sk_buff *skb;
195 struct ieee80211_mgmt *action_frame;
196
197 /* 27 = header + category + action + smps mode */
198 skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom);
199 if (!skb)
200 return -ENOMEM;
201
202 skb_reserve(skb, local->hw.extra_tx_headroom);
203 action_frame = (void *)skb_put(skb, 27);
204 memcpy(action_frame->da, da, ETH_ALEN);
205 memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN);
206 memcpy(action_frame->bssid, bssid, ETH_ALEN);
207 action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
208 IEEE80211_STYPE_ACTION);
209 action_frame->u.action.category = WLAN_CATEGORY_HT;
210 action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS;
211 switch (smps) {
212 case IEEE80211_SMPS_AUTOMATIC:
213 case IEEE80211_SMPS_NUM_MODES:
214 WARN_ON(1);
215 case IEEE80211_SMPS_OFF:
216 action_frame->u.action.u.ht_smps.smps_control =
217 WLAN_HT_SMPS_CONTROL_DISABLED;
218 break;
219 case IEEE80211_SMPS_STATIC:
220 action_frame->u.action.u.ht_smps.smps_control =
221 WLAN_HT_SMPS_CONTROL_STATIC;
222 break;
223 case IEEE80211_SMPS_DYNAMIC:
224 action_frame->u.action.u.ht_smps.smps_control =
225 WLAN_HT_SMPS_CONTROL_DYNAMIC;
226 break;
227 }
228
229 /* we'll do more on status of this frame */
230 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
231 ieee80211_tx_skb(sdata, skb);
232
233 return 0;
234}