1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * HT handling 4 * 5 * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> 6 * Copyright 2002-2005, Instant802 Networks, Inc. 7 * Copyright 2005-2006, Devicescape Software, Inc. 8 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> 9 * Copyright 2007, Michael Wu <flamingice@sourmilk.net> 10 * Copyright 2007-2010, Intel Corporation 11 * Copyright 2017 Intel Deutschland GmbH 12 */ 13 14 #include <linux/ieee80211.h> 15 #include <linux/export.h> 16 #include <net/mac80211.h> 17 #include "ieee80211_i.h" 18 #include "rate.h" 19 20 static void __check_htcap_disable(struct ieee80211_ht_cap *ht_capa, 21 struct ieee80211_ht_cap *ht_capa_mask, 22 struct ieee80211_sta_ht_cap *ht_cap, 23 u16 flag) 24 { 25 __le16 le_flag = cpu_to_le16(flag); 26 if (ht_capa_mask->cap_info & le_flag) { 27 if (!(ht_capa->cap_info & le_flag)) 28 ht_cap->cap &= ~flag; 29 } 30 } 31 32 static void __check_htcap_enable(struct ieee80211_ht_cap *ht_capa, 33 struct ieee80211_ht_cap *ht_capa_mask, 34 struct ieee80211_sta_ht_cap *ht_cap, 35 u16 flag) 36 { 37 __le16 le_flag = cpu_to_le16(flag); 38 39 if ((ht_capa_mask->cap_info & le_flag) && 40 (ht_capa->cap_info & le_flag)) 41 ht_cap->cap |= flag; 42 } 43 44 void ieee80211_apply_htcap_overrides(struct ieee80211_sub_if_data *sdata, 45 struct ieee80211_sta_ht_cap *ht_cap) 46 { 47 struct ieee80211_ht_cap *ht_capa, *ht_capa_mask; 48 u8 *scaps, *smask; 49 int i; 50 51 if (!ht_cap->ht_supported) 52 return; 53 54 switch (sdata->vif.type) { 55 case NL80211_IFTYPE_STATION: 56 ht_capa = &sdata->u.mgd.ht_capa; 57 ht_capa_mask = &sdata->u.mgd.ht_capa_mask; 58 break; 59 case NL80211_IFTYPE_ADHOC: 60 ht_capa = &sdata->u.ibss.ht_capa; 61 ht_capa_mask = &sdata->u.ibss.ht_capa_mask; 62 break; 63 default: 64 WARN_ON_ONCE(1); 65 return; 66 } 67 68 scaps = (u8 *)(&ht_capa->mcs.rx_mask); 69 smask = (u8 *)(&ht_capa_mask->mcs.rx_mask); 70 71 /* NOTE: If you add more over-rides here, update register_hw 72 * ht_capa_mod_mask logic in main.c as well. 73 * And, if this method can ever change ht_cap.ht_supported, fix 74 * the check in ieee80211_add_ht_ie. 75 */ 76 77 /* check for HT over-rides, MCS rates first. */ 78 for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++) { 79 u8 m = smask[i]; 80 ht_cap->mcs.rx_mask[i] &= ~m; /* turn off all masked bits */ 81 /* Add back rates that are supported */ 82 ht_cap->mcs.rx_mask[i] |= (m & scaps[i]); 83 } 84 85 /* Force removal of HT-40 capabilities? */ 86 __check_htcap_disable(ht_capa, ht_capa_mask, ht_cap, 87 IEEE80211_HT_CAP_SUP_WIDTH_20_40); 88 __check_htcap_disable(ht_capa, ht_capa_mask, ht_cap, 89 IEEE80211_HT_CAP_SGI_40); 90 91 /* Allow user to disable SGI-20 (SGI-40 is handled above) */ 92 __check_htcap_disable(ht_capa, ht_capa_mask, ht_cap, 93 IEEE80211_HT_CAP_SGI_20); 94 95 /* Allow user to disable the max-AMSDU bit. */ 96 __check_htcap_disable(ht_capa, ht_capa_mask, ht_cap, 97 IEEE80211_HT_CAP_MAX_AMSDU); 98 99 /* Allow user to disable LDPC */ 100 __check_htcap_disable(ht_capa, ht_capa_mask, ht_cap, 101 IEEE80211_HT_CAP_LDPC_CODING); 102 103 /* Allow user to enable 40 MHz intolerant bit. */ 104 __check_htcap_enable(ht_capa, ht_capa_mask, ht_cap, 105 IEEE80211_HT_CAP_40MHZ_INTOLERANT); 106 107 /* Allow user to enable TX STBC bit */ 108 __check_htcap_enable(ht_capa, ht_capa_mask, ht_cap, 109 IEEE80211_HT_CAP_TX_STBC); 110 111 /* Allow user to configure RX STBC bits */ 112 if (ht_capa_mask->cap_info & cpu_to_le16(IEEE80211_HT_CAP_RX_STBC)) 113 ht_cap->cap |= le16_to_cpu(ht_capa->cap_info) & 114 IEEE80211_HT_CAP_RX_STBC; 115 116 /* Allow user to decrease AMPDU factor */ 117 if (ht_capa_mask->ampdu_params_info & 118 IEEE80211_HT_AMPDU_PARM_FACTOR) { 119 u8 n = ht_capa->ampdu_params_info & 120 IEEE80211_HT_AMPDU_PARM_FACTOR; 121 if (n < ht_cap->ampdu_factor) 122 ht_cap->ampdu_factor = n; 123 } 124 125 /* Allow the user to increase AMPDU density. */ 126 if (ht_capa_mask->ampdu_params_info & 127 IEEE80211_HT_AMPDU_PARM_DENSITY) { 128 u8 n = (ht_capa->ampdu_params_info & 129 IEEE80211_HT_AMPDU_PARM_DENSITY) 130 >> IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT; 131 if (n > ht_cap->ampdu_density) 132 ht_cap->ampdu_density = n; 133 } 134 } 135 136 137 bool ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_sub_if_data *sdata, 138 struct ieee80211_supported_band *sband, 139 const struct ieee80211_ht_cap *ht_cap_ie, 140 struct sta_info *sta) 141 { 142 struct ieee80211_sta_ht_cap ht_cap, own_cap; 143 u8 ampdu_info, tx_mcs_set_cap; 144 int i, max_tx_streams; 145 bool changed; 146 enum ieee80211_sta_rx_bandwidth bw; 147 enum ieee80211_smps_mode smps_mode; 148 149 memset(&ht_cap, 0, sizeof(ht_cap)); 150 151 if (!ht_cap_ie || !sband->ht_cap.ht_supported) 152 goto apply; 153 154 ht_cap.ht_supported = true; 155 156 own_cap = sband->ht_cap; 157 158 /* 159 * If user has specified capability over-rides, take care 160 * of that if the station we're setting up is the AP or TDLS peer that 161 * we advertised a restricted capability set to. Override 162 * our own capabilities and then use those below. 163 */ 164 if (sdata->vif.type == NL80211_IFTYPE_STATION || 165 sdata->vif.type == NL80211_IFTYPE_ADHOC) 166 ieee80211_apply_htcap_overrides(sdata, &own_cap); 167 168 /* 169 * The bits listed in this expression should be 170 * the same for the peer and us, if the station 171 * advertises more then we can't use those thus 172 * we mask them out. 173 */ 174 ht_cap.cap = le16_to_cpu(ht_cap_ie->cap_info) & 175 (own_cap.cap | ~(IEEE80211_HT_CAP_LDPC_CODING | 176 IEEE80211_HT_CAP_SUP_WIDTH_20_40 | 177 IEEE80211_HT_CAP_GRN_FLD | 178 IEEE80211_HT_CAP_SGI_20 | 179 IEEE80211_HT_CAP_SGI_40 | 180 IEEE80211_HT_CAP_DSSSCCK40)); 181 182 /* 183 * The STBC bits are asymmetric -- if we don't have 184 * TX then mask out the peer's RX and vice versa. 185 */ 186 if (!(own_cap.cap & IEEE80211_HT_CAP_TX_STBC)) 187 ht_cap.cap &= ~IEEE80211_HT_CAP_RX_STBC; 188 if (!(own_cap.cap & IEEE80211_HT_CAP_RX_STBC)) 189 ht_cap.cap &= ~IEEE80211_HT_CAP_TX_STBC; 190 191 ampdu_info = ht_cap_ie->ampdu_params_info; 192 ht_cap.ampdu_factor = 193 ampdu_info & IEEE80211_HT_AMPDU_PARM_FACTOR; 194 ht_cap.ampdu_density = 195 (ampdu_info & IEEE80211_HT_AMPDU_PARM_DENSITY) >> 2; 196 197 /* own MCS TX capabilities */ 198 tx_mcs_set_cap = own_cap.mcs.tx_params; 199 200 /* Copy peer MCS TX capabilities, the driver might need them. */ 201 ht_cap.mcs.tx_params = ht_cap_ie->mcs.tx_params; 202 203 /* can we TX with MCS rates? */ 204 if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED)) 205 goto apply; 206 207 /* Counting from 0, therefore +1 */ 208 if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF) 209 max_tx_streams = 210 ((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK) 211 >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1; 212 else 213 max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS; 214 215 /* 216 * 802.11n-2009 20.3.5 / 20.6 says: 217 * - indices 0 to 7 and 32 are single spatial stream 218 * - 8 to 31 are multiple spatial streams using equal modulation 219 * [8..15 for two streams, 16..23 for three and 24..31 for four] 220 * - remainder are multiple spatial streams using unequal modulation 221 */ 222 for (i = 0; i < max_tx_streams; i++) 223 ht_cap.mcs.rx_mask[i] = 224 own_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i]; 225 226 if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION) 227 for (i = IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE; 228 i < IEEE80211_HT_MCS_MASK_LEN; i++) 229 ht_cap.mcs.rx_mask[i] = 230 own_cap.mcs.rx_mask[i] & 231 ht_cap_ie->mcs.rx_mask[i]; 232 233 /* handle MCS rate 32 too */ 234 if (own_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1) 235 ht_cap.mcs.rx_mask[32/8] |= 1; 236 237 /* set Rx highest rate */ 238 ht_cap.mcs.rx_highest = ht_cap_ie->mcs.rx_highest; 239 240 if (ht_cap.cap & IEEE80211_HT_CAP_MAX_AMSDU) 241 sta->sta.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_7935; 242 else 243 sta->sta.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_3839; 244 245 apply: 246 changed = memcmp(&sta->sta.ht_cap, &ht_cap, sizeof(ht_cap)); 247 248 memcpy(&sta->sta.ht_cap, &ht_cap, sizeof(ht_cap)); 249 250 switch (sdata->vif.bss_conf.chandef.width) { 251 default: 252 WARN_ON_ONCE(1); 253 /* fall through */ 254 case NL80211_CHAN_WIDTH_20_NOHT: 255 case NL80211_CHAN_WIDTH_20: 256 bw = IEEE80211_STA_RX_BW_20; 257 break; 258 case NL80211_CHAN_WIDTH_40: 259 case NL80211_CHAN_WIDTH_80: 260 case NL80211_CHAN_WIDTH_80P80: 261 case NL80211_CHAN_WIDTH_160: 262 bw = ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ? 263 IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20; 264 break; 265 } 266 267 sta->sta.bandwidth = bw; 268 269 sta->cur_max_bandwidth = 270 ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ? 271 IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20; 272 273 switch ((ht_cap.cap & IEEE80211_HT_CAP_SM_PS) 274 >> IEEE80211_HT_CAP_SM_PS_SHIFT) { 275 case WLAN_HT_CAP_SM_PS_INVALID: 276 case WLAN_HT_CAP_SM_PS_STATIC: 277 smps_mode = IEEE80211_SMPS_STATIC; 278 break; 279 case WLAN_HT_CAP_SM_PS_DYNAMIC: 280 smps_mode = IEEE80211_SMPS_DYNAMIC; 281 break; 282 case WLAN_HT_CAP_SM_PS_DISABLED: 283 smps_mode = IEEE80211_SMPS_OFF; 284 break; 285 } 286 287 if (smps_mode != sta->sta.smps_mode) 288 changed = true; 289 sta->sta.smps_mode = smps_mode; 290 291 return changed; 292 } 293 294 void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta, 295 enum ieee80211_agg_stop_reason reason) 296 { 297 int i; 298 299 mutex_lock(&sta->ampdu_mlme.mtx); 300 for (i = 0; i < IEEE80211_NUM_TIDS; i++) 301 ___ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT, 302 WLAN_REASON_QSTA_LEAVE_QBSS, 303 reason != AGG_STOP_DESTROY_STA && 304 reason != AGG_STOP_PEER_REQUEST); 305 306 for (i = 0; i < IEEE80211_NUM_TIDS; i++) 307 ___ieee80211_stop_tx_ba_session(sta, i, reason); 308 mutex_unlock(&sta->ampdu_mlme.mtx); 309 310 /* 311 * In case the tear down is part of a reconfigure due to HW restart 312 * request, it is possible that the low level driver requested to stop 313 * the BA session, so handle it to properly clean tid_tx data. 314 */ 315 if(reason == AGG_STOP_DESTROY_STA) { 316 cancel_work_sync(&sta->ampdu_mlme.work); 317 318 mutex_lock(&sta->ampdu_mlme.mtx); 319 for (i = 0; i < IEEE80211_NUM_TIDS; i++) { 320 struct tid_ampdu_tx *tid_tx = 321 rcu_dereference_protected_tid_tx(sta, i); 322 323 if (!tid_tx) 324 continue; 325 326 if (test_and_clear_bit(HT_AGG_STATE_STOP_CB, &tid_tx->state)) 327 ieee80211_stop_tx_ba_cb(sta, i, tid_tx); 328 } 329 mutex_unlock(&sta->ampdu_mlme.mtx); 330 } 331 } 332 333 void ieee80211_ba_session_work(struct work_struct *work) 334 { 335 struct sta_info *sta = 336 container_of(work, struct sta_info, ampdu_mlme.work); 337 struct tid_ampdu_tx *tid_tx; 338 bool blocked; 339 int tid; 340 341 /* When this flag is set, new sessions should be blocked. */ 342 blocked = test_sta_flag(sta, WLAN_STA_BLOCK_BA); 343 344 mutex_lock(&sta->ampdu_mlme.mtx); 345 for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) { 346 if (test_and_clear_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired)) 347 ___ieee80211_stop_rx_ba_session( 348 sta, tid, WLAN_BACK_RECIPIENT, 349 WLAN_REASON_QSTA_TIMEOUT, true); 350 351 if (test_and_clear_bit(tid, 352 sta->ampdu_mlme.tid_rx_stop_requested)) 353 ___ieee80211_stop_rx_ba_session( 354 sta, tid, WLAN_BACK_RECIPIENT, 355 WLAN_REASON_UNSPECIFIED, true); 356 357 if (!blocked && 358 test_and_clear_bit(tid, 359 sta->ampdu_mlme.tid_rx_manage_offl)) 360 ___ieee80211_start_rx_ba_session(sta, 0, 0, 0, 1, tid, 361 IEEE80211_MAX_AMPDU_BUF_HT, 362 false, true); 363 364 if (test_and_clear_bit(tid + IEEE80211_NUM_TIDS, 365 sta->ampdu_mlme.tid_rx_manage_offl)) 366 ___ieee80211_stop_rx_ba_session( 367 sta, tid, WLAN_BACK_RECIPIENT, 368 0, false); 369 370 spin_lock_bh(&sta->lock); 371 372 tid_tx = sta->ampdu_mlme.tid_start_tx[tid]; 373 if (!blocked && tid_tx) { 374 /* 375 * Assign it over to the normal tid_tx array 376 * where it "goes live". 377 */ 378 379 sta->ampdu_mlme.tid_start_tx[tid] = NULL; 380 /* could there be a race? */ 381 if (sta->ampdu_mlme.tid_tx[tid]) 382 kfree(tid_tx); 383 else 384 ieee80211_assign_tid_tx(sta, tid, tid_tx); 385 spin_unlock_bh(&sta->lock); 386 387 ieee80211_tx_ba_session_handle_start(sta, tid); 388 continue; 389 } 390 spin_unlock_bh(&sta->lock); 391 392 tid_tx = rcu_dereference_protected_tid_tx(sta, tid); 393 if (!tid_tx) 394 continue; 395 396 if (!blocked && 397 test_and_clear_bit(HT_AGG_STATE_START_CB, &tid_tx->state)) 398 ieee80211_start_tx_ba_cb(sta, tid, tid_tx); 399 if (test_and_clear_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state)) 400 ___ieee80211_stop_tx_ba_session(sta, tid, 401 AGG_STOP_LOCAL_REQUEST); 402 if (test_and_clear_bit(HT_AGG_STATE_STOP_CB, &tid_tx->state)) 403 ieee80211_stop_tx_ba_cb(sta, tid, tid_tx); 404 } 405 mutex_unlock(&sta->ampdu_mlme.mtx); 406 } 407 408 void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata, 409 const u8 *da, u16 tid, 410 u16 initiator, u16 reason_code) 411 { 412 struct ieee80211_local *local = sdata->local; 413 struct sk_buff *skb; 414 struct ieee80211_mgmt *mgmt; 415 u16 params; 416 417 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); 418 if (!skb) 419 return; 420 421 skb_reserve(skb, local->hw.extra_tx_headroom); 422 mgmt = skb_put_zero(skb, 24); 423 memcpy(mgmt->da, da, ETH_ALEN); 424 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 425 if (sdata->vif.type == NL80211_IFTYPE_AP || 426 sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 427 sdata->vif.type == NL80211_IFTYPE_MESH_POINT) 428 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); 429 else if (sdata->vif.type == NL80211_IFTYPE_STATION) 430 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); 431 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 432 memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN); 433 434 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 435 IEEE80211_STYPE_ACTION); 436 437 skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba)); 438 439 mgmt->u.action.category = WLAN_CATEGORY_BACK; 440 mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA; 441 params = (u16)(initiator << 11); /* bit 11 initiator */ 442 params |= (u16)(tid << 12); /* bit 15:12 TID number */ 443 444 mgmt->u.action.u.delba.params = cpu_to_le16(params); 445 mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code); 446 447 ieee80211_tx_skb(sdata, skb); 448 } 449 450 void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata, 451 struct sta_info *sta, 452 struct ieee80211_mgmt *mgmt, size_t len) 453 { 454 u16 tid, params; 455 u16 initiator; 456 457 params = le16_to_cpu(mgmt->u.action.u.delba.params); 458 tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12; 459 initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11; 460 461 ht_dbg_ratelimited(sdata, "delba from %pM (%s) tid %d reason code %d\n", 462 mgmt->sa, initiator ? "initiator" : "recipient", 463 tid, 464 le16_to_cpu(mgmt->u.action.u.delba.reason_code)); 465 466 if (initiator == WLAN_BACK_INITIATOR) 467 __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0, 468 true); 469 else 470 __ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_PEER_REQUEST); 471 } 472 473 enum nl80211_smps_mode 474 ieee80211_smps_mode_to_smps_mode(enum ieee80211_smps_mode smps) 475 { 476 switch (smps) { 477 case IEEE80211_SMPS_OFF: 478 return NL80211_SMPS_OFF; 479 case IEEE80211_SMPS_STATIC: 480 return NL80211_SMPS_STATIC; 481 case IEEE80211_SMPS_DYNAMIC: 482 return NL80211_SMPS_DYNAMIC; 483 default: 484 return NL80211_SMPS_OFF; 485 } 486 } 487 488 int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata, 489 enum ieee80211_smps_mode smps, const u8 *da, 490 const u8 *bssid) 491 { 492 struct ieee80211_local *local = sdata->local; 493 struct sk_buff *skb; 494 struct ieee80211_mgmt *action_frame; 495 496 /* 27 = header + category + action + smps mode */ 497 skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom); 498 if (!skb) 499 return -ENOMEM; 500 501 skb_reserve(skb, local->hw.extra_tx_headroom); 502 action_frame = skb_put(skb, 27); 503 memcpy(action_frame->da, da, ETH_ALEN); 504 memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN); 505 memcpy(action_frame->bssid, bssid, ETH_ALEN); 506 action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 507 IEEE80211_STYPE_ACTION); 508 action_frame->u.action.category = WLAN_CATEGORY_HT; 509 action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS; 510 switch (smps) { 511 case IEEE80211_SMPS_AUTOMATIC: 512 case IEEE80211_SMPS_NUM_MODES: 513 WARN_ON(1); 514 /* fall through */ 515 case IEEE80211_SMPS_OFF: 516 action_frame->u.action.u.ht_smps.smps_control = 517 WLAN_HT_SMPS_CONTROL_DISABLED; 518 break; 519 case IEEE80211_SMPS_STATIC: 520 action_frame->u.action.u.ht_smps.smps_control = 521 WLAN_HT_SMPS_CONTROL_STATIC; 522 break; 523 case IEEE80211_SMPS_DYNAMIC: 524 action_frame->u.action.u.ht_smps.smps_control = 525 WLAN_HT_SMPS_CONTROL_DYNAMIC; 526 break; 527 } 528 529 /* we'll do more on status of this frame */ 530 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 531 ieee80211_tx_skb(sdata, skb); 532 533 return 0; 534 } 535 536 void ieee80211_request_smps_mgd_work(struct work_struct *work) 537 { 538 struct ieee80211_sub_if_data *sdata = 539 container_of(work, struct ieee80211_sub_if_data, 540 u.mgd.request_smps_work); 541 542 sdata_lock(sdata); 543 __ieee80211_request_smps_mgd(sdata, sdata->u.mgd.driver_smps_mode); 544 sdata_unlock(sdata); 545 } 546 547 void ieee80211_request_smps_ap_work(struct work_struct *work) 548 { 549 struct ieee80211_sub_if_data *sdata = 550 container_of(work, struct ieee80211_sub_if_data, 551 u.ap.request_smps_work); 552 553 sdata_lock(sdata); 554 if (sdata_dereference(sdata->u.ap.beacon, sdata)) 555 __ieee80211_request_smps_ap(sdata, 556 sdata->u.ap.driver_smps_mode); 557 sdata_unlock(sdata); 558 } 559 560 void ieee80211_request_smps(struct ieee80211_vif *vif, 561 enum ieee80211_smps_mode smps_mode) 562 { 563 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 564 565 if (WARN_ON_ONCE(vif->type != NL80211_IFTYPE_STATION && 566 vif->type != NL80211_IFTYPE_AP)) 567 return; 568 569 if (vif->type == NL80211_IFTYPE_STATION) { 570 if (sdata->u.mgd.driver_smps_mode == smps_mode) 571 return; 572 sdata->u.mgd.driver_smps_mode = smps_mode; 573 ieee80211_queue_work(&sdata->local->hw, 574 &sdata->u.mgd.request_smps_work); 575 } else { 576 /* AUTOMATIC is meaningless in AP mode */ 577 if (WARN_ON_ONCE(smps_mode == IEEE80211_SMPS_AUTOMATIC)) 578 return; 579 if (sdata->u.ap.driver_smps_mode == smps_mode) 580 return; 581 sdata->u.ap.driver_smps_mode = smps_mode; 582 ieee80211_queue_work(&sdata->local->hw, 583 &sdata->u.ap.request_smps_work); 584 } 585 } 586 /* this might change ... don't want non-open drivers using it */ 587 EXPORT_SYMBOL_GPL(ieee80211_request_smps); 588