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/mac80211.h> 18 #include "ieee80211_i.h" 19 #include "rate.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 void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta) 86 { 87 int i; 88 89 for (i = 0; i < STA_TID_NUM; i++) { 90 __ieee80211_stop_tx_ba_session(sta, i, WLAN_BACK_INITIATOR); 91 __ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT, 92 WLAN_REASON_QSTA_LEAVE_QBSS); 93 } 94 } 95 96 void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata, 97 const u8 *da, u16 tid, 98 u16 initiator, u16 reason_code) 99 { 100 struct ieee80211_local *local = sdata->local; 101 struct sk_buff *skb; 102 struct ieee80211_mgmt *mgmt; 103 u16 params; 104 105 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); 106 107 if (!skb) { 108 printk(KERN_ERR "%s: failed to allocate buffer " 109 "for delba frame\n", sdata->dev->name); 110 return; 111 } 112 113 skb_reserve(skb, local->hw.extra_tx_headroom); 114 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); 115 memset(mgmt, 0, 24); 116 memcpy(mgmt->da, da, ETH_ALEN); 117 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); 118 if (sdata->vif.type == NL80211_IFTYPE_AP || 119 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 120 memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN); 121 else if (sdata->vif.type == NL80211_IFTYPE_STATION) 122 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); 123 124 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 125 IEEE80211_STYPE_ACTION); 126 127 skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba)); 128 129 mgmt->u.action.category = WLAN_CATEGORY_BACK; 130 mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA; 131 params = (u16)(initiator << 11); /* bit 11 initiator */ 132 params |= (u16)(tid << 12); /* bit 15:12 TID number */ 133 134 mgmt->u.action.u.delba.params = cpu_to_le16(params); 135 mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code); 136 137 ieee80211_tx_skb(sdata, skb, 1); 138 } 139 140 void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata, 141 struct sta_info *sta, 142 struct ieee80211_mgmt *mgmt, size_t len) 143 { 144 u16 tid, params; 145 u16 initiator; 146 147 params = le16_to_cpu(mgmt->u.action.u.delba.params); 148 tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12; 149 initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11; 150 151 #ifdef CONFIG_MAC80211_HT_DEBUG 152 if (net_ratelimit()) 153 printk(KERN_DEBUG "delba from %pM (%s) tid %d reason code %d\n", 154 mgmt->sa, initiator ? "initiator" : "recipient", tid, 155 le16_to_cpu(mgmt->u.action.u.delba.reason_code)); 156 #endif /* CONFIG_MAC80211_HT_DEBUG */ 157 158 if (initiator == WLAN_BACK_INITIATOR) 159 ieee80211_sta_stop_rx_ba_session(sdata, sta->sta.addr, tid, 160 WLAN_BACK_INITIATOR, 0); 161 else { /* WLAN_BACK_RECIPIENT */ 162 spin_lock_bh(&sta->lock); 163 if (sta->ampdu_mlme.tid_state_tx[tid] & HT_ADDBA_REQUESTED_MSK) 164 ___ieee80211_stop_tx_ba_session(sta, tid, 165 WLAN_BACK_RECIPIENT); 166 spin_unlock_bh(&sta->lock); 167 } 168 } 169