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 2007-2010, 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 || !sband->ht_cap.ht_supported) 33 return; 34 35 ht_cap->ht_supported = true; 36 37 /* 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; 59 60 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; 65 66 /* own MCS TX capabilities */ 67 tx_mcs_set_cap = sband->ht_cap.mcs.tx_params; 68 69 /* Copy peer MCS TX capabilities, the driver might need them. */ 70 ht_cap->mcs.tx_params = ht_cap_ie->mcs.tx_params; 71 72 /* can we TX with MCS rates? */ 73 if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED)) 74 return; 75 76 /* Counting from 0, therefore +1 */ 77 if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF) 78 max_tx_streams = 79 ((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK) 80 >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1; 81 else 82 max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS; 83 84 /* 85 * 802.11n-2009 20.3.5 / 20.6 says: 86 * - indices 0 to 7 and 32 are single spatial stream 87 * - 8 to 31 are multiple spatial streams using equal modulation 88 * [8..15 for two streams, 16..23 for three and 24..31 for four] 89 * - remainder are multiple spatial streams using unequal modulation 90 */ 91 for (i = 0; i < max_tx_streams; i++) 92 ht_cap->mcs.rx_mask[i] = 93 sband->ht_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i]; 94 95 if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION) 96 for (i = IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE; 97 i < IEEE80211_HT_MCS_MASK_LEN; i++) 98 ht_cap->mcs.rx_mask[i] = 99 sband->ht_cap.mcs.rx_mask[i] & 100 ht_cap_ie->mcs.rx_mask[i]; 101 102 /* handle MCS rate 32 too */ 103 if (sband->ht_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1) 104 ht_cap->mcs.rx_mask[32/8] |= 1; 105 } 106 107 void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta, bool tx) 108 { 109 int i; 110 111 cancel_work_sync(&sta->ampdu_mlme.work); 112 113 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 } 119 120 void ieee80211_ba_session_work(struct work_struct *work) 121 { 122 struct sta_info *sta = 123 container_of(work, struct sta_info, ampdu_mlme.work); 124 struct tid_ampdu_tx *tid_tx; 125 int tid; 126 127 /* 128 * When this flag is set, new sessions should be 129 * blocked, and existing sessions will be torn 130 * down by the code that set the flag, so this 131 * need not run. 132 */ 133 if (test_sta_flags(sta, WLAN_STA_BLOCK_BA)) 134 return; 135 136 mutex_lock(&sta->ampdu_mlme.mtx); 137 for (tid = 0; tid < STA_TID_NUM; tid++) { 138 if (test_and_clear_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired)) 139 ___ieee80211_stop_rx_ba_session( 140 sta, tid, WLAN_BACK_RECIPIENT, 141 WLAN_REASON_QSTA_TIMEOUT, true); 142 143 tid_tx = sta->ampdu_mlme.tid_start_tx[tid]; 144 if (tid_tx) { 145 /* 146 * Assign it over to the normal tid_tx array 147 * where it "goes live". 148 */ 149 spin_lock_bh(&sta->lock); 150 151 sta->ampdu_mlme.tid_start_tx[tid] = NULL; 152 /* could there be a race? */ 153 if (sta->ampdu_mlme.tid_tx[tid]) 154 kfree(tid_tx); 155 else 156 ieee80211_assign_tid_tx(sta, tid, tid_tx); 157 spin_unlock_bh(&sta->lock); 158 159 ieee80211_tx_ba_session_handle_start(sta, tid); 160 continue; 161 } 162 163 tid_tx = rcu_dereference_protected_tid_tx(sta, tid); 164 if (tid_tx && test_and_clear_bit(HT_AGG_STATE_WANT_STOP, 165 &tid_tx->state)) 166 ___ieee80211_stop_tx_ba_session(sta, tid, 167 WLAN_BACK_INITIATOR, 168 true); 169 } 170 mutex_unlock(&sta->ampdu_mlme.mtx); 171 } 172 173 void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata, 174 const u8 *da, u16 tid, 175 u16 initiator, u16 reason_code) 176 { 177 struct ieee80211_local *local = sdata->local; 178 struct sk_buff *skb; 179 struct ieee80211_mgmt *mgmt; 180 u16 params; 181 182 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); 183 184 if (!skb) { 185 printk(KERN_ERR "%s: failed to allocate buffer " 186 "for delba frame\n", sdata->name); 187 return; 188 } 189 190 skb_reserve(skb, local->hw.extra_tx_headroom); 191 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); 192 memset(mgmt, 0, 24); 193 memcpy(mgmt->da, da, ETH_ALEN); 194 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 195 if (sdata->vif.type == NL80211_IFTYPE_AP || 196 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 197 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); 198 else if (sdata->vif.type == NL80211_IFTYPE_STATION) 199 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); 200 201 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 202 IEEE80211_STYPE_ACTION); 203 204 skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba)); 205 206 mgmt->u.action.category = WLAN_CATEGORY_BACK; 207 mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA; 208 params = (u16)(initiator << 11); /* bit 11 initiator */ 209 params |= (u16)(tid << 12); /* bit 15:12 TID number */ 210 211 mgmt->u.action.u.delba.params = cpu_to_le16(params); 212 mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code); 213 214 ieee80211_tx_skb(sdata, skb); 215 } 216 217 void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata, 218 struct sta_info *sta, 219 struct ieee80211_mgmt *mgmt, size_t len) 220 { 221 u16 tid, params; 222 u16 initiator; 223 224 params = le16_to_cpu(mgmt->u.action.u.delba.params); 225 tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12; 226 initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11; 227 228 #ifdef CONFIG_MAC80211_HT_DEBUG 229 if (net_ratelimit()) 230 printk(KERN_DEBUG "delba from %pM (%s) tid %d reason code %d\n", 231 mgmt->sa, initiator ? "initiator" : "recipient", tid, 232 le16_to_cpu(mgmt->u.action.u.delba.reason_code)); 233 #endif /* CONFIG_MAC80211_HT_DEBUG */ 234 235 if (initiator == WLAN_BACK_INITIATOR) 236 __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0, 237 true); 238 else 239 __ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_RECIPIENT, 240 true); 241 } 242 243 int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata, 244 enum ieee80211_smps_mode smps, const u8 *da, 245 const u8 *bssid) 246 { 247 struct ieee80211_local *local = sdata->local; 248 struct sk_buff *skb; 249 struct ieee80211_mgmt *action_frame; 250 251 /* 27 = header + category + action + smps mode */ 252 skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom); 253 if (!skb) 254 return -ENOMEM; 255 256 skb_reserve(skb, local->hw.extra_tx_headroom); 257 action_frame = (void *)skb_put(skb, 27); 258 memcpy(action_frame->da, da, ETH_ALEN); 259 memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN); 260 memcpy(action_frame->bssid, bssid, ETH_ALEN); 261 action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 262 IEEE80211_STYPE_ACTION); 263 action_frame->u.action.category = WLAN_CATEGORY_HT; 264 action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS; 265 switch (smps) { 266 case IEEE80211_SMPS_AUTOMATIC: 267 case IEEE80211_SMPS_NUM_MODES: 268 WARN_ON(1); 269 case IEEE80211_SMPS_OFF: 270 action_frame->u.action.u.ht_smps.smps_control = 271 WLAN_HT_SMPS_CONTROL_DISABLED; 272 break; 273 case IEEE80211_SMPS_STATIC: 274 action_frame->u.action.u.ht_smps.smps_control = 275 WLAN_HT_SMPS_CONTROL_STATIC; 276 break; 277 case IEEE80211_SMPS_DYNAMIC: 278 action_frame->u.action.u.ht_smps.smps_control = 279 WLAN_HT_SMPS_CONTROL_DYNAMIC; 280 break; 281 } 282 283 /* we'll do more on status of this frame */ 284 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 285 ieee80211_tx_skb(sdata, skb); 286 287 return 0; 288 } 289 290 void ieee80211_request_smps_work(struct work_struct *work) 291 { 292 struct ieee80211_sub_if_data *sdata = 293 container_of(work, struct ieee80211_sub_if_data, 294 u.mgd.request_smps_work); 295 296 mutex_lock(&sdata->u.mgd.mtx); 297 __ieee80211_request_smps(sdata, sdata->u.mgd.driver_smps_mode); 298 mutex_unlock(&sdata->u.mgd.mtx); 299 } 300 301 void ieee80211_request_smps(struct ieee80211_vif *vif, 302 enum ieee80211_smps_mode smps_mode) 303 { 304 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 305 306 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 307 return; 308 309 if (WARN_ON(smps_mode == IEEE80211_SMPS_OFF)) 310 smps_mode = IEEE80211_SMPS_AUTOMATIC; 311 312 sdata->u.mgd.driver_smps_mode = smps_mode; 313 314 ieee80211_queue_work(&sdata->local->hw, 315 &sdata->u.mgd.request_smps_work); 316 } 317 /* this might change ... don't want non-open drivers using it */ 318 EXPORT_SYMBOL_GPL(ieee80211_request_smps); 319