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 * Copyright 2017 Intel Deutschland GmbH 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License version 2 as 14 * published by the Free Software Foundation. 15 */ 16 17 #include <linux/ieee80211.h> 18 #include <linux/export.h> 19 #include <net/mac80211.h> 20 #include "ieee80211_i.h" 21 #include "rate.h" 22 23 static void __check_htcap_disable(struct ieee80211_ht_cap *ht_capa, 24 struct ieee80211_ht_cap *ht_capa_mask, 25 struct ieee80211_sta_ht_cap *ht_cap, 26 u16 flag) 27 { 28 __le16 le_flag = cpu_to_le16(flag); 29 if (ht_capa_mask->cap_info & le_flag) { 30 if (!(ht_capa->cap_info & le_flag)) 31 ht_cap->cap &= ~flag; 32 } 33 } 34 35 static void __check_htcap_enable(struct ieee80211_ht_cap *ht_capa, 36 struct ieee80211_ht_cap *ht_capa_mask, 37 struct ieee80211_sta_ht_cap *ht_cap, 38 u16 flag) 39 { 40 __le16 le_flag = cpu_to_le16(flag); 41 42 if ((ht_capa_mask->cap_info & le_flag) && 43 (ht_capa->cap_info & le_flag)) 44 ht_cap->cap |= flag; 45 } 46 47 void ieee80211_apply_htcap_overrides(struct ieee80211_sub_if_data *sdata, 48 struct ieee80211_sta_ht_cap *ht_cap) 49 { 50 struct ieee80211_ht_cap *ht_capa, *ht_capa_mask; 51 u8 *scaps, *smask; 52 int i; 53 54 if (!ht_cap->ht_supported) 55 return; 56 57 switch (sdata->vif.type) { 58 case NL80211_IFTYPE_STATION: 59 ht_capa = &sdata->u.mgd.ht_capa; 60 ht_capa_mask = &sdata->u.mgd.ht_capa_mask; 61 break; 62 case NL80211_IFTYPE_ADHOC: 63 ht_capa = &sdata->u.ibss.ht_capa; 64 ht_capa_mask = &sdata->u.ibss.ht_capa_mask; 65 break; 66 default: 67 WARN_ON_ONCE(1); 68 return; 69 } 70 71 scaps = (u8 *)(&ht_capa->mcs.rx_mask); 72 smask = (u8 *)(&ht_capa_mask->mcs.rx_mask); 73 74 /* NOTE: If you add more over-rides here, update register_hw 75 * ht_capa_mod_mask logic in main.c as well. 76 * And, if this method can ever change ht_cap.ht_supported, fix 77 * the check in ieee80211_add_ht_ie. 78 */ 79 80 /* check for HT over-rides, MCS rates first. */ 81 for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++) { 82 u8 m = smask[i]; 83 ht_cap->mcs.rx_mask[i] &= ~m; /* turn off all masked bits */ 84 /* Add back rates that are supported */ 85 ht_cap->mcs.rx_mask[i] |= (m & scaps[i]); 86 } 87 88 /* Force removal of HT-40 capabilities? */ 89 __check_htcap_disable(ht_capa, ht_capa_mask, ht_cap, 90 IEEE80211_HT_CAP_SUP_WIDTH_20_40); 91 __check_htcap_disable(ht_capa, ht_capa_mask, ht_cap, 92 IEEE80211_HT_CAP_SGI_40); 93 94 /* Allow user to disable SGI-20 (SGI-40 is handled above) */ 95 __check_htcap_disable(ht_capa, ht_capa_mask, ht_cap, 96 IEEE80211_HT_CAP_SGI_20); 97 98 /* Allow user to disable the max-AMSDU bit. */ 99 __check_htcap_disable(ht_capa, ht_capa_mask, ht_cap, 100 IEEE80211_HT_CAP_MAX_AMSDU); 101 102 /* Allow user to disable LDPC */ 103 __check_htcap_disable(ht_capa, ht_capa_mask, ht_cap, 104 IEEE80211_HT_CAP_LDPC_CODING); 105 106 /* Allow user to enable 40 MHz intolerant bit. */ 107 __check_htcap_enable(ht_capa, ht_capa_mask, ht_cap, 108 IEEE80211_HT_CAP_40MHZ_INTOLERANT); 109 110 /* Allow user to decrease AMPDU factor */ 111 if (ht_capa_mask->ampdu_params_info & 112 IEEE80211_HT_AMPDU_PARM_FACTOR) { 113 u8 n = ht_capa->ampdu_params_info & 114 IEEE80211_HT_AMPDU_PARM_FACTOR; 115 if (n < ht_cap->ampdu_factor) 116 ht_cap->ampdu_factor = n; 117 } 118 119 /* Allow the user to increase AMPDU density. */ 120 if (ht_capa_mask->ampdu_params_info & 121 IEEE80211_HT_AMPDU_PARM_DENSITY) { 122 u8 n = (ht_capa->ampdu_params_info & 123 IEEE80211_HT_AMPDU_PARM_DENSITY) 124 >> IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT; 125 if (n > ht_cap->ampdu_density) 126 ht_cap->ampdu_density = n; 127 } 128 } 129 130 131 bool ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_sub_if_data *sdata, 132 struct ieee80211_supported_band *sband, 133 const struct ieee80211_ht_cap *ht_cap_ie, 134 struct sta_info *sta) 135 { 136 struct ieee80211_sta_ht_cap ht_cap, own_cap; 137 u8 ampdu_info, tx_mcs_set_cap; 138 int i, max_tx_streams; 139 bool changed; 140 enum ieee80211_sta_rx_bandwidth bw; 141 enum ieee80211_smps_mode smps_mode; 142 143 memset(&ht_cap, 0, sizeof(ht_cap)); 144 145 if (!ht_cap_ie || !sband->ht_cap.ht_supported) 146 goto apply; 147 148 ht_cap.ht_supported = true; 149 150 own_cap = sband->ht_cap; 151 152 /* 153 * If user has specified capability over-rides, take care 154 * of that if the station we're setting up is the AP or TDLS peer that 155 * we advertised a restricted capability set to. Override 156 * our own capabilities and then use those below. 157 */ 158 if (sdata->vif.type == NL80211_IFTYPE_STATION || 159 sdata->vif.type == NL80211_IFTYPE_ADHOC) 160 ieee80211_apply_htcap_overrides(sdata, &own_cap); 161 162 /* 163 * The bits listed in this expression should be 164 * the same for the peer and us, if the station 165 * advertises more then we can't use those thus 166 * we mask them out. 167 */ 168 ht_cap.cap = le16_to_cpu(ht_cap_ie->cap_info) & 169 (own_cap.cap | ~(IEEE80211_HT_CAP_LDPC_CODING | 170 IEEE80211_HT_CAP_SUP_WIDTH_20_40 | 171 IEEE80211_HT_CAP_GRN_FLD | 172 IEEE80211_HT_CAP_SGI_20 | 173 IEEE80211_HT_CAP_SGI_40 | 174 IEEE80211_HT_CAP_DSSSCCK40)); 175 176 /* 177 * The STBC bits are asymmetric -- if we don't have 178 * TX then mask out the peer's RX and vice versa. 179 */ 180 if (!(own_cap.cap & IEEE80211_HT_CAP_TX_STBC)) 181 ht_cap.cap &= ~IEEE80211_HT_CAP_RX_STBC; 182 if (!(own_cap.cap & IEEE80211_HT_CAP_RX_STBC)) 183 ht_cap.cap &= ~IEEE80211_HT_CAP_TX_STBC; 184 185 ampdu_info = ht_cap_ie->ampdu_params_info; 186 ht_cap.ampdu_factor = 187 ampdu_info & IEEE80211_HT_AMPDU_PARM_FACTOR; 188 ht_cap.ampdu_density = 189 (ampdu_info & IEEE80211_HT_AMPDU_PARM_DENSITY) >> 2; 190 191 /* own MCS TX capabilities */ 192 tx_mcs_set_cap = own_cap.mcs.tx_params; 193 194 /* Copy peer MCS TX capabilities, the driver might need them. */ 195 ht_cap.mcs.tx_params = ht_cap_ie->mcs.tx_params; 196 197 /* can we TX with MCS rates? */ 198 if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED)) 199 goto apply; 200 201 /* Counting from 0, therefore +1 */ 202 if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF) 203 max_tx_streams = 204 ((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK) 205 >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1; 206 else 207 max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS; 208 209 /* 210 * 802.11n-2009 20.3.5 / 20.6 says: 211 * - indices 0 to 7 and 32 are single spatial stream 212 * - 8 to 31 are multiple spatial streams using equal modulation 213 * [8..15 for two streams, 16..23 for three and 24..31 for four] 214 * - remainder are multiple spatial streams using unequal modulation 215 */ 216 for (i = 0; i < max_tx_streams; i++) 217 ht_cap.mcs.rx_mask[i] = 218 own_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i]; 219 220 if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION) 221 for (i = IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE; 222 i < IEEE80211_HT_MCS_MASK_LEN; i++) 223 ht_cap.mcs.rx_mask[i] = 224 own_cap.mcs.rx_mask[i] & 225 ht_cap_ie->mcs.rx_mask[i]; 226 227 /* handle MCS rate 32 too */ 228 if (own_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1) 229 ht_cap.mcs.rx_mask[32/8] |= 1; 230 231 /* set Rx highest rate */ 232 ht_cap.mcs.rx_highest = ht_cap_ie->mcs.rx_highest; 233 234 if (ht_cap.cap & IEEE80211_HT_CAP_MAX_AMSDU) 235 sta->sta.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_7935; 236 else 237 sta->sta.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_3839; 238 239 apply: 240 changed = memcmp(&sta->sta.ht_cap, &ht_cap, sizeof(ht_cap)); 241 242 memcpy(&sta->sta.ht_cap, &ht_cap, sizeof(ht_cap)); 243 244 switch (sdata->vif.bss_conf.chandef.width) { 245 default: 246 WARN_ON_ONCE(1); 247 /* fall through */ 248 case NL80211_CHAN_WIDTH_20_NOHT: 249 case NL80211_CHAN_WIDTH_20: 250 bw = IEEE80211_STA_RX_BW_20; 251 break; 252 case NL80211_CHAN_WIDTH_40: 253 case NL80211_CHAN_WIDTH_80: 254 case NL80211_CHAN_WIDTH_80P80: 255 case NL80211_CHAN_WIDTH_160: 256 bw = ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ? 257 IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20; 258 break; 259 } 260 261 sta->sta.bandwidth = bw; 262 263 sta->cur_max_bandwidth = 264 ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ? 265 IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20; 266 267 switch ((ht_cap.cap & IEEE80211_HT_CAP_SM_PS) 268 >> IEEE80211_HT_CAP_SM_PS_SHIFT) { 269 case WLAN_HT_CAP_SM_PS_INVALID: 270 case WLAN_HT_CAP_SM_PS_STATIC: 271 smps_mode = IEEE80211_SMPS_STATIC; 272 break; 273 case WLAN_HT_CAP_SM_PS_DYNAMIC: 274 smps_mode = IEEE80211_SMPS_DYNAMIC; 275 break; 276 case WLAN_HT_CAP_SM_PS_DISABLED: 277 smps_mode = IEEE80211_SMPS_OFF; 278 break; 279 } 280 281 if (smps_mode != sta->sta.smps_mode) 282 changed = true; 283 sta->sta.smps_mode = smps_mode; 284 285 return changed; 286 } 287 288 void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta, 289 enum ieee80211_agg_stop_reason reason) 290 { 291 int i; 292 293 mutex_lock(&sta->ampdu_mlme.mtx); 294 for (i = 0; i < IEEE80211_NUM_TIDS; i++) 295 ___ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT, 296 WLAN_REASON_QSTA_LEAVE_QBSS, 297 reason != AGG_STOP_DESTROY_STA && 298 reason != AGG_STOP_PEER_REQUEST); 299 300 for (i = 0; i < IEEE80211_NUM_TIDS; i++) 301 ___ieee80211_stop_tx_ba_session(sta, i, reason); 302 mutex_unlock(&sta->ampdu_mlme.mtx); 303 304 /* 305 * In case the tear down is part of a reconfigure due to HW restart 306 * request, it is possible that the low level driver requested to stop 307 * the BA session, so handle it to properly clean tid_tx data. 308 */ 309 if(reason == AGG_STOP_DESTROY_STA) { 310 cancel_work_sync(&sta->ampdu_mlme.work); 311 312 mutex_lock(&sta->ampdu_mlme.mtx); 313 for (i = 0; i < IEEE80211_NUM_TIDS; i++) { 314 struct tid_ampdu_tx *tid_tx = 315 rcu_dereference_protected_tid_tx(sta, i); 316 317 if (!tid_tx) 318 continue; 319 320 if (test_and_clear_bit(HT_AGG_STATE_STOP_CB, &tid_tx->state)) 321 ieee80211_stop_tx_ba_cb(sta, i, tid_tx); 322 } 323 mutex_unlock(&sta->ampdu_mlme.mtx); 324 } 325 } 326 327 void ieee80211_ba_session_work(struct work_struct *work) 328 { 329 struct sta_info *sta = 330 container_of(work, struct sta_info, ampdu_mlme.work); 331 struct tid_ampdu_tx *tid_tx; 332 bool blocked; 333 int tid; 334 335 /* When this flag is set, new sessions should be blocked. */ 336 blocked = test_sta_flag(sta, WLAN_STA_BLOCK_BA); 337 338 mutex_lock(&sta->ampdu_mlme.mtx); 339 for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) { 340 if (test_and_clear_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired)) 341 ___ieee80211_stop_rx_ba_session( 342 sta, tid, WLAN_BACK_RECIPIENT, 343 WLAN_REASON_QSTA_TIMEOUT, true); 344 345 if (test_and_clear_bit(tid, 346 sta->ampdu_mlme.tid_rx_stop_requested)) 347 ___ieee80211_stop_rx_ba_session( 348 sta, tid, WLAN_BACK_RECIPIENT, 349 WLAN_REASON_UNSPECIFIED, true); 350 351 if (!blocked && 352 test_and_clear_bit(tid, 353 sta->ampdu_mlme.tid_rx_manage_offl)) 354 ___ieee80211_start_rx_ba_session(sta, 0, 0, 0, 1, tid, 355 IEEE80211_MAX_AMPDU_BUF_HT, 356 false, true); 357 358 if (test_and_clear_bit(tid + IEEE80211_NUM_TIDS, 359 sta->ampdu_mlme.tid_rx_manage_offl)) 360 ___ieee80211_stop_rx_ba_session( 361 sta, tid, WLAN_BACK_RECIPIENT, 362 0, false); 363 364 spin_lock_bh(&sta->lock); 365 366 tid_tx = sta->ampdu_mlme.tid_start_tx[tid]; 367 if (!blocked && tid_tx) { 368 /* 369 * Assign it over to the normal tid_tx array 370 * where it "goes live". 371 */ 372 373 sta->ampdu_mlme.tid_start_tx[tid] = NULL; 374 /* could there be a race? */ 375 if (sta->ampdu_mlme.tid_tx[tid]) 376 kfree(tid_tx); 377 else 378 ieee80211_assign_tid_tx(sta, tid, tid_tx); 379 spin_unlock_bh(&sta->lock); 380 381 ieee80211_tx_ba_session_handle_start(sta, tid); 382 continue; 383 } 384 spin_unlock_bh(&sta->lock); 385 386 tid_tx = rcu_dereference_protected_tid_tx(sta, tid); 387 if (!tid_tx) 388 continue; 389 390 if (!blocked && 391 test_and_clear_bit(HT_AGG_STATE_START_CB, &tid_tx->state)) 392 ieee80211_start_tx_ba_cb(sta, tid, tid_tx); 393 if (test_and_clear_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state)) 394 ___ieee80211_stop_tx_ba_session(sta, tid, 395 AGG_STOP_LOCAL_REQUEST); 396 if (test_and_clear_bit(HT_AGG_STATE_STOP_CB, &tid_tx->state)) 397 ieee80211_stop_tx_ba_cb(sta, tid, tid_tx); 398 } 399 mutex_unlock(&sta->ampdu_mlme.mtx); 400 } 401 402 void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata, 403 const u8 *da, u16 tid, 404 u16 initiator, u16 reason_code) 405 { 406 struct ieee80211_local *local = sdata->local; 407 struct sk_buff *skb; 408 struct ieee80211_mgmt *mgmt; 409 u16 params; 410 411 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); 412 if (!skb) 413 return; 414 415 skb_reserve(skb, local->hw.extra_tx_headroom); 416 mgmt = skb_put_zero(skb, 24); 417 memcpy(mgmt->da, da, ETH_ALEN); 418 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 419 if (sdata->vif.type == NL80211_IFTYPE_AP || 420 sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 421 sdata->vif.type == NL80211_IFTYPE_MESH_POINT) 422 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); 423 else if (sdata->vif.type == NL80211_IFTYPE_STATION) 424 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); 425 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 426 memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN); 427 428 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 429 IEEE80211_STYPE_ACTION); 430 431 skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba)); 432 433 mgmt->u.action.category = WLAN_CATEGORY_BACK; 434 mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA; 435 params = (u16)(initiator << 11); /* bit 11 initiator */ 436 params |= (u16)(tid << 12); /* bit 15:12 TID number */ 437 438 mgmt->u.action.u.delba.params = cpu_to_le16(params); 439 mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code); 440 441 ieee80211_tx_skb(sdata, skb); 442 } 443 444 void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata, 445 struct sta_info *sta, 446 struct ieee80211_mgmt *mgmt, size_t len) 447 { 448 u16 tid, params; 449 u16 initiator; 450 451 params = le16_to_cpu(mgmt->u.action.u.delba.params); 452 tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12; 453 initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11; 454 455 ht_dbg_ratelimited(sdata, "delba from %pM (%s) tid %d reason code %d\n", 456 mgmt->sa, initiator ? "initiator" : "recipient", 457 tid, 458 le16_to_cpu(mgmt->u.action.u.delba.reason_code)); 459 460 if (initiator == WLAN_BACK_INITIATOR) 461 __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0, 462 true); 463 else 464 __ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_PEER_REQUEST); 465 } 466 467 enum nl80211_smps_mode 468 ieee80211_smps_mode_to_smps_mode(enum ieee80211_smps_mode smps) 469 { 470 switch (smps) { 471 case IEEE80211_SMPS_OFF: 472 return NL80211_SMPS_OFF; 473 case IEEE80211_SMPS_STATIC: 474 return NL80211_SMPS_STATIC; 475 case IEEE80211_SMPS_DYNAMIC: 476 return NL80211_SMPS_DYNAMIC; 477 default: 478 return NL80211_SMPS_OFF; 479 } 480 } 481 482 int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata, 483 enum ieee80211_smps_mode smps, const u8 *da, 484 const u8 *bssid) 485 { 486 struct ieee80211_local *local = sdata->local; 487 struct sk_buff *skb; 488 struct ieee80211_mgmt *action_frame; 489 490 /* 27 = header + category + action + smps mode */ 491 skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom); 492 if (!skb) 493 return -ENOMEM; 494 495 skb_reserve(skb, local->hw.extra_tx_headroom); 496 action_frame = skb_put(skb, 27); 497 memcpy(action_frame->da, da, ETH_ALEN); 498 memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN); 499 memcpy(action_frame->bssid, bssid, ETH_ALEN); 500 action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 501 IEEE80211_STYPE_ACTION); 502 action_frame->u.action.category = WLAN_CATEGORY_HT; 503 action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS; 504 switch (smps) { 505 case IEEE80211_SMPS_AUTOMATIC: 506 case IEEE80211_SMPS_NUM_MODES: 507 WARN_ON(1); 508 /* fall through */ 509 case IEEE80211_SMPS_OFF: 510 action_frame->u.action.u.ht_smps.smps_control = 511 WLAN_HT_SMPS_CONTROL_DISABLED; 512 break; 513 case IEEE80211_SMPS_STATIC: 514 action_frame->u.action.u.ht_smps.smps_control = 515 WLAN_HT_SMPS_CONTROL_STATIC; 516 break; 517 case IEEE80211_SMPS_DYNAMIC: 518 action_frame->u.action.u.ht_smps.smps_control = 519 WLAN_HT_SMPS_CONTROL_DYNAMIC; 520 break; 521 } 522 523 /* we'll do more on status of this frame */ 524 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 525 ieee80211_tx_skb(sdata, skb); 526 527 return 0; 528 } 529 530 void ieee80211_request_smps_mgd_work(struct work_struct *work) 531 { 532 struct ieee80211_sub_if_data *sdata = 533 container_of(work, struct ieee80211_sub_if_data, 534 u.mgd.request_smps_work); 535 536 sdata_lock(sdata); 537 __ieee80211_request_smps_mgd(sdata, sdata->u.mgd.driver_smps_mode); 538 sdata_unlock(sdata); 539 } 540 541 void ieee80211_request_smps_ap_work(struct work_struct *work) 542 { 543 struct ieee80211_sub_if_data *sdata = 544 container_of(work, struct ieee80211_sub_if_data, 545 u.ap.request_smps_work); 546 547 sdata_lock(sdata); 548 if (sdata_dereference(sdata->u.ap.beacon, sdata)) 549 __ieee80211_request_smps_ap(sdata, 550 sdata->u.ap.driver_smps_mode); 551 sdata_unlock(sdata); 552 } 553 554 void ieee80211_request_smps(struct ieee80211_vif *vif, 555 enum ieee80211_smps_mode smps_mode) 556 { 557 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 558 559 if (WARN_ON_ONCE(vif->type != NL80211_IFTYPE_STATION && 560 vif->type != NL80211_IFTYPE_AP)) 561 return; 562 563 if (vif->type == NL80211_IFTYPE_STATION) { 564 if (sdata->u.mgd.driver_smps_mode == smps_mode) 565 return; 566 sdata->u.mgd.driver_smps_mode = smps_mode; 567 ieee80211_queue_work(&sdata->local->hw, 568 &sdata->u.mgd.request_smps_work); 569 } else { 570 /* AUTOMATIC is meaningless in AP mode */ 571 if (WARN_ON_ONCE(smps_mode == IEEE80211_SMPS_AUTOMATIC)) 572 return; 573 if (sdata->u.ap.driver_smps_mode == smps_mode) 574 return; 575 sdata->u.ap.driver_smps_mode = smps_mode; 576 ieee80211_queue_work(&sdata->local->hw, 577 &sdata->u.ap.request_smps_work); 578 } 579 } 580 /* this might change ... don't want non-open drivers using it */ 581 EXPORT_SYMBOL_GPL(ieee80211_request_smps); 582