SAFE public projects git trees. - safe/jmp/linux-2.6/blob - net/mac80211/ht.c

   1 /*
   2  * HT handling
   3  *
   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
  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>
  17 #include <net/wireless.h>
  18 #include <net/mac80211.h>
  19 #include "ieee80211_i.h"
  20
  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)
  24 {
  25         u8 ampdu_info, tx_mcs_set_cap;
  26         int i, max_tx_streams;
  27
  28         BUG_ON(!ht_cap);
  29
  30         memset(ht_cap, 0, sizeof(*ht_cap));
  31
  32         if (!ht_cap_ie)
  33                 return;
  34
  35         ht_cap->ht_supported = true;
  36
  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;
  40
  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;
  46
  47         /* own MCS TX capabilities */
  48         tx_mcs_set_cap = sband->ht_cap.mcs.tx_params;
  49
  50         /* can we TX with MCS rates? */
  51         if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED))
  52                 return;
  53
  54         /* Counting from 0, therefore +1 */
  55         if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF)
  56                 max_tx_streams =
  57                         ((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
  58                                 >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
  59         else
  60                 max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS;
  61
  62         /*
  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
  68          */
  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];
  72
  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];
  79
  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;
  83 }
  84
  85 /*
  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.
  89  */
  90 u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
  91                         struct ieee80211_ht_info *hti,
  92                         u16 ap_ht_cap_flags)
  93 {
  94         struct ieee80211_local *local = sdata->local;
  95         struct ieee80211_supported_band *sband;
  96         struct ieee80211_bss_ht_conf ht;
  97         u32 changed = 0;
  98         bool enable_ht = true, ht_changed;
  99         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
 100
 101         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
 102
 103         memset(&ht, 0, sizeof(ht));
 104
 105         /* HT is not supported */
 106         if (!sband->ht_cap.ht_supported)
 107                 enable_ht = false;
 108
 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))
 112                 enable_ht = false;
 113
 114         if (enable_ht) {
 115                 channel_type = NL80211_CHAN_HT20;
 116
 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;
 123                                 break;
 124                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 125                                 channel_type = NL80211_CHAN_HT40MINUS;
 126                                 break;
 127                         }
 128                 }
 129         }
 130
 131         ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
 132                      channel_type != local->hw.conf.channel_type;
 133
 134         local->oper_channel_type = channel_type;
 135
 136         if (ht_changed) {
 137                 /* channel_type change automatically detected */
 138                 ieee80211_hw_config(local, 0);
 139         }
 140
 141         /* disable HT */
 142         if (!enable_ht)
 143                 return 0;
 144
 145         ht.operation_mode = le16_to_cpu(hti->operation_mode);
 146
 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;
 151         }
 152
 153         return changed;
 154 }
 155
 156 void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta)
 157 {
 158         int i;
 159
 160         for (i = 0; i <  STA_TID_NUM; i++) {
 161                 __ieee80211_stop_tx_ba_session(sta, i, WLAN_BACK_INITIATOR);
 162                 __ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT,
 163                                                WLAN_REASON_QSTA_LEAVE_QBSS);
 164         }
 165 }
 166
 167 void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
 168                           const u8 *da, u16 tid,
 169                           u16 initiator, u16 reason_code)
 170 {
 171         struct ieee80211_local *local = sdata->local;
 172         struct sk_buff *skb;
 173         struct ieee80211_mgmt *mgmt;
 174         u16 params;
 175
 176         skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
 177
 178         if (!skb) {
 179                 printk(KERN_ERR "%s: failed to allocate buffer "
 180                                         "for delba frame\n", sdata->dev->name);
 181                 return;
 182         }
 183
 184         skb_reserve(skb, local->hw.extra_tx_headroom);
 185         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 186         memset(mgmt, 0, 24);
 187         memcpy(mgmt->da, da, ETH_ALEN);
 188         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 189         if (sdata->vif.type == NL80211_IFTYPE_AP ||
 190             sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 191                 memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
 192         else if (sdata->vif.type == NL80211_IFTYPE_STATION)
 193                 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
 194
 195         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 196                                           IEEE80211_STYPE_ACTION);
 197
 198         skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
 199
 200         mgmt->u.action.category = WLAN_CATEGORY_BACK;
 201         mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
 202         params = (u16)(initiator << 11);        /* bit 11 initiator */
 203         params |= (u16)(tid << 12);             /* bit 15:12 TID number */
 204
 205         mgmt->u.action.u.delba.params = cpu_to_le16(params);
 206         mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
 207
 208         ieee80211_tx_skb(sdata, skb, 1);
 209 }
 210
 211 void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
 212                              struct sta_info *sta,
 213                              struct ieee80211_mgmt *mgmt, size_t len)
 214 {
 215         struct ieee80211_local *local = sdata->local;
 216         u16 tid, params;
 217         u16 initiator;
 218
 219         params = le16_to_cpu(mgmt->u.action.u.delba.params);
 220         tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
 221         initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
 222
 223 #ifdef CONFIG_MAC80211_HT_DEBUG
 224         if (net_ratelimit())
 225                 printk(KERN_DEBUG "delba from %pM (%s) tid %d reason code %d\n",
 226                         mgmt->sa, initiator ? "initiator" : "recipient", tid,
 227                         mgmt->u.action.u.delba.reason_code);
 228 #endif /* CONFIG_MAC80211_HT_DEBUG */
 229
 230         if (initiator == WLAN_BACK_INITIATOR)
 231                 ieee80211_sta_stop_rx_ba_session(sdata, sta->sta.addr, tid,
 232                                                  WLAN_BACK_INITIATOR, 0);
 233         else { /* WLAN_BACK_RECIPIENT */
 234                 spin_lock_bh(&sta->lock);
 235                 sta->ampdu_mlme.tid_state_tx[tid] =
 236                                 HT_AGG_STATE_OPERATIONAL;
 237                 spin_unlock_bh(&sta->lock);
 238                 ieee80211_stop_tx_ba_session(&local->hw, sta->sta.addr, tid,
 239                                              WLAN_BACK_RECIPIENT);
 240         }
 241 }