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 /* stopping might queue the work again - so cancel only afterwards */ 305 cancel_work_sync(&sta->ampdu_mlme.work); 306 307 /* 308 * In case the tear down is part of a reconfigure due to HW restart 309 * request, it is possible that the low level driver requested to stop 310 * the BA session, so handle it to properly clean tid_tx data. 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 void ieee80211_ba_session_work(struct work_struct *work) 327 { 328 struct sta_info *sta = 329 container_of(work, struct sta_info, ampdu_mlme.work); 330 struct tid_ampdu_tx *tid_tx; 331 int tid; 332 333 /* 334 * When this flag is set, new sessions should be 335 * blocked, and existing sessions will be torn 336 * down by the code that set the flag, so this 337 * need not run. 338 */ 339 if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) 340 return; 341 342 mutex_lock(&sta->ampdu_mlme.mtx); 343 for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) { 344 if (test_and_clear_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired)) 345 ___ieee80211_stop_rx_ba_session( 346 sta, tid, WLAN_BACK_RECIPIENT, 347 WLAN_REASON_QSTA_TIMEOUT, true); 348 349 if (test_and_clear_bit(tid, 350 sta->ampdu_mlme.tid_rx_stop_requested)) 351 ___ieee80211_stop_rx_ba_session( 352 sta, tid, WLAN_BACK_RECIPIENT, 353 WLAN_REASON_UNSPECIFIED, true); 354 355 if (test_and_clear_bit(tid, 356 sta->ampdu_mlme.tid_rx_manage_offl)) 357 ___ieee80211_start_rx_ba_session(sta, 0, 0, 0, 1, tid, 358 IEEE80211_MAX_AMPDU_BUF, 359 false, true); 360 361 if (test_and_clear_bit(tid + IEEE80211_NUM_TIDS, 362 sta->ampdu_mlme.tid_rx_manage_offl)) 363 ___ieee80211_stop_rx_ba_session( 364 sta, tid, WLAN_BACK_RECIPIENT, 365 0, false); 366 367 spin_lock_bh(&sta->lock); 368 369 tid_tx = sta->ampdu_mlme.tid_start_tx[tid]; 370 if (tid_tx) { 371 /* 372 * Assign it over to the normal tid_tx array 373 * where it "goes live". 374 */ 375 376 sta->ampdu_mlme.tid_start_tx[tid] = NULL; 377 /* could there be a race? */ 378 if (sta->ampdu_mlme.tid_tx[tid]) 379 kfree(tid_tx); 380 else 381 ieee80211_assign_tid_tx(sta, tid, tid_tx); 382 spin_unlock_bh(&sta->lock); 383 384 ieee80211_tx_ba_session_handle_start(sta, tid); 385 continue; 386 } 387 spin_unlock_bh(&sta->lock); 388 389 tid_tx = rcu_dereference_protected_tid_tx(sta, tid); 390 if (!tid_tx) 391 continue; 392 393 if (test_and_clear_bit(HT_AGG_STATE_START_CB, &tid_tx->state)) 394 ieee80211_start_tx_ba_cb(sta, tid, tid_tx); 395 if (test_and_clear_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state)) 396 ___ieee80211_stop_tx_ba_session(sta, tid, 397 AGG_STOP_LOCAL_REQUEST); 398 if (test_and_clear_bit(HT_AGG_STATE_STOP_CB, &tid_tx->state)) 399 ieee80211_stop_tx_ba_cb(sta, tid, tid_tx); 400 } 401 mutex_unlock(&sta->ampdu_mlme.mtx); 402 } 403 404 void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata, 405 const u8 *da, u16 tid, 406 u16 initiator, u16 reason_code) 407 { 408 struct ieee80211_local *local = sdata->local; 409 struct sk_buff *skb; 410 struct ieee80211_mgmt *mgmt; 411 u16 params; 412 413 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); 414 if (!skb) 415 return; 416 417 skb_reserve(skb, local->hw.extra_tx_headroom); 418 mgmt = skb_put_zero(skb, 24); 419 memcpy(mgmt->da, da, ETH_ALEN); 420 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 421 if (sdata->vif.type == NL80211_IFTYPE_AP || 422 sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 423 sdata->vif.type == NL80211_IFTYPE_MESH_POINT) 424 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); 425 else if (sdata->vif.type == NL80211_IFTYPE_STATION) 426 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); 427 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 428 memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN); 429 430 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 431 IEEE80211_STYPE_ACTION); 432 433 skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba)); 434 435 mgmt->u.action.category = WLAN_CATEGORY_BACK; 436 mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA; 437 params = (u16)(initiator << 11); /* bit 11 initiator */ 438 params |= (u16)(tid << 12); /* bit 15:12 TID number */ 439 440 mgmt->u.action.u.delba.params = cpu_to_le16(params); 441 mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code); 442 443 ieee80211_tx_skb(sdata, skb); 444 } 445 446 void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata, 447 struct sta_info *sta, 448 struct ieee80211_mgmt *mgmt, size_t len) 449 { 450 u16 tid, params; 451 u16 initiator; 452 453 params = le16_to_cpu(mgmt->u.action.u.delba.params); 454 tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12; 455 initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11; 456 457 ht_dbg_ratelimited(sdata, "delba from %pM (%s) tid %d reason code %d\n", 458 mgmt->sa, initiator ? "initiator" : "recipient", 459 tid, 460 le16_to_cpu(mgmt->u.action.u.delba.reason_code)); 461 462 if (initiator == WLAN_BACK_INITIATOR) 463 __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0, 464 true); 465 else 466 __ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_PEER_REQUEST); 467 } 468 469 int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata, 470 enum ieee80211_smps_mode smps, const u8 *da, 471 const u8 *bssid) 472 { 473 struct ieee80211_local *local = sdata->local; 474 struct sk_buff *skb; 475 struct ieee80211_mgmt *action_frame; 476 477 /* 27 = header + category + action + smps mode */ 478 skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom); 479 if (!skb) 480 return -ENOMEM; 481 482 skb_reserve(skb, local->hw.extra_tx_headroom); 483 action_frame = skb_put(skb, 27); 484 memcpy(action_frame->da, da, ETH_ALEN); 485 memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN); 486 memcpy(action_frame->bssid, bssid, ETH_ALEN); 487 action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 488 IEEE80211_STYPE_ACTION); 489 action_frame->u.action.category = WLAN_CATEGORY_HT; 490 action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS; 491 switch (smps) { 492 case IEEE80211_SMPS_AUTOMATIC: 493 case IEEE80211_SMPS_NUM_MODES: 494 WARN_ON(1); 495 /* fall through */ 496 case IEEE80211_SMPS_OFF: 497 action_frame->u.action.u.ht_smps.smps_control = 498 WLAN_HT_SMPS_CONTROL_DISABLED; 499 break; 500 case IEEE80211_SMPS_STATIC: 501 action_frame->u.action.u.ht_smps.smps_control = 502 WLAN_HT_SMPS_CONTROL_STATIC; 503 break; 504 case IEEE80211_SMPS_DYNAMIC: 505 action_frame->u.action.u.ht_smps.smps_control = 506 WLAN_HT_SMPS_CONTROL_DYNAMIC; 507 break; 508 } 509 510 /* we'll do more on status of this frame */ 511 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 512 ieee80211_tx_skb(sdata, skb); 513 514 return 0; 515 } 516 517 void ieee80211_request_smps_mgd_work(struct work_struct *work) 518 { 519 struct ieee80211_sub_if_data *sdata = 520 container_of(work, struct ieee80211_sub_if_data, 521 u.mgd.request_smps_work); 522 523 sdata_lock(sdata); 524 __ieee80211_request_smps_mgd(sdata, sdata->u.mgd.driver_smps_mode); 525 sdata_unlock(sdata); 526 } 527 528 void ieee80211_request_smps_ap_work(struct work_struct *work) 529 { 530 struct ieee80211_sub_if_data *sdata = 531 container_of(work, struct ieee80211_sub_if_data, 532 u.ap.request_smps_work); 533 534 sdata_lock(sdata); 535 if (sdata_dereference(sdata->u.ap.beacon, sdata)) 536 __ieee80211_request_smps_ap(sdata, 537 sdata->u.ap.driver_smps_mode); 538 sdata_unlock(sdata); 539 } 540 541 void ieee80211_request_smps(struct ieee80211_vif *vif, 542 enum ieee80211_smps_mode smps_mode) 543 { 544 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 545 546 if (WARN_ON_ONCE(vif->type != NL80211_IFTYPE_STATION && 547 vif->type != NL80211_IFTYPE_AP)) 548 return; 549 550 if (vif->type == NL80211_IFTYPE_STATION) { 551 if (sdata->u.mgd.driver_smps_mode == smps_mode) 552 return; 553 sdata->u.mgd.driver_smps_mode = smps_mode; 554 ieee80211_queue_work(&sdata->local->hw, 555 &sdata->u.mgd.request_smps_work); 556 } else { 557 /* AUTOMATIC is meaningless in AP mode */ 558 if (WARN_ON_ONCE(smps_mode == IEEE80211_SMPS_AUTOMATIC)) 559 return; 560 if (sdata->u.ap.driver_smps_mode == smps_mode) 561 return; 562 sdata->u.ap.driver_smps_mode = smps_mode; 563 ieee80211_queue_work(&sdata->local->hw, 564 &sdata->u.ap.request_smps_work); 565 } 566 } 567 /* this might change ... don't want non-open drivers using it */ 568 EXPORT_SYMBOL_GPL(ieee80211_request_smps); 569