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 enable TX STBC bit */ 111 __check_htcap_enable(ht_capa, ht_capa_mask, ht_cap, 112 IEEE80211_HT_CAP_TX_STBC); 113 114 /* Allow user to configure RX STBC bits */ 115 if (ht_capa_mask->cap_info & IEEE80211_HT_CAP_RX_STBC) 116 ht_cap->cap |= ht_capa->cap_info & IEEE80211_HT_CAP_RX_STBC; 117 118 /* Allow user to decrease AMPDU factor */ 119 if (ht_capa_mask->ampdu_params_info & 120 IEEE80211_HT_AMPDU_PARM_FACTOR) { 121 u8 n = ht_capa->ampdu_params_info & 122 IEEE80211_HT_AMPDU_PARM_FACTOR; 123 if (n < ht_cap->ampdu_factor) 124 ht_cap->ampdu_factor = n; 125 } 126 127 /* Allow the user to increase AMPDU density. */ 128 if (ht_capa_mask->ampdu_params_info & 129 IEEE80211_HT_AMPDU_PARM_DENSITY) { 130 u8 n = (ht_capa->ampdu_params_info & 131 IEEE80211_HT_AMPDU_PARM_DENSITY) 132 >> IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT; 133 if (n > ht_cap->ampdu_density) 134 ht_cap->ampdu_density = n; 135 } 136 } 137 138 139 bool ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_sub_if_data *sdata, 140 struct ieee80211_supported_band *sband, 141 const struct ieee80211_ht_cap *ht_cap_ie, 142 struct sta_info *sta) 143 { 144 struct ieee80211_sta_ht_cap ht_cap, own_cap; 145 u8 ampdu_info, tx_mcs_set_cap; 146 int i, max_tx_streams; 147 bool changed; 148 enum ieee80211_sta_rx_bandwidth bw; 149 enum ieee80211_smps_mode smps_mode; 150 151 memset(&ht_cap, 0, sizeof(ht_cap)); 152 153 if (!ht_cap_ie || !sband->ht_cap.ht_supported) 154 goto apply; 155 156 ht_cap.ht_supported = true; 157 158 own_cap = sband->ht_cap; 159 160 /* 161 * If user has specified capability over-rides, take care 162 * of that if the station we're setting up is the AP or TDLS peer that 163 * we advertised a restricted capability set to. Override 164 * our own capabilities and then use those below. 165 */ 166 if (sdata->vif.type == NL80211_IFTYPE_STATION || 167 sdata->vif.type == NL80211_IFTYPE_ADHOC) 168 ieee80211_apply_htcap_overrides(sdata, &own_cap); 169 170 /* 171 * The bits listed in this expression should be 172 * the same for the peer and us, if the station 173 * advertises more then we can't use those thus 174 * we mask them out. 175 */ 176 ht_cap.cap = le16_to_cpu(ht_cap_ie->cap_info) & 177 (own_cap.cap | ~(IEEE80211_HT_CAP_LDPC_CODING | 178 IEEE80211_HT_CAP_SUP_WIDTH_20_40 | 179 IEEE80211_HT_CAP_GRN_FLD | 180 IEEE80211_HT_CAP_SGI_20 | 181 IEEE80211_HT_CAP_SGI_40 | 182 IEEE80211_HT_CAP_DSSSCCK40)); 183 184 /* 185 * The STBC bits are asymmetric -- if we don't have 186 * TX then mask out the peer's RX and vice versa. 187 */ 188 if (!(own_cap.cap & IEEE80211_HT_CAP_TX_STBC)) 189 ht_cap.cap &= ~IEEE80211_HT_CAP_RX_STBC; 190 if (!(own_cap.cap & IEEE80211_HT_CAP_RX_STBC)) 191 ht_cap.cap &= ~IEEE80211_HT_CAP_TX_STBC; 192 193 ampdu_info = ht_cap_ie->ampdu_params_info; 194 ht_cap.ampdu_factor = 195 ampdu_info & IEEE80211_HT_AMPDU_PARM_FACTOR; 196 ht_cap.ampdu_density = 197 (ampdu_info & IEEE80211_HT_AMPDU_PARM_DENSITY) >> 2; 198 199 /* own MCS TX capabilities */ 200 tx_mcs_set_cap = own_cap.mcs.tx_params; 201 202 /* Copy peer MCS TX capabilities, the driver might need them. */ 203 ht_cap.mcs.tx_params = ht_cap_ie->mcs.tx_params; 204 205 /* can we TX with MCS rates? */ 206 if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED)) 207 goto apply; 208 209 /* Counting from 0, therefore +1 */ 210 if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF) 211 max_tx_streams = 212 ((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK) 213 >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1; 214 else 215 max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS; 216 217 /* 218 * 802.11n-2009 20.3.5 / 20.6 says: 219 * - indices 0 to 7 and 32 are single spatial stream 220 * - 8 to 31 are multiple spatial streams using equal modulation 221 * [8..15 for two streams, 16..23 for three and 24..31 for four] 222 * - remainder are multiple spatial streams using unequal modulation 223 */ 224 for (i = 0; i < max_tx_streams; i++) 225 ht_cap.mcs.rx_mask[i] = 226 own_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i]; 227 228 if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION) 229 for (i = IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE; 230 i < IEEE80211_HT_MCS_MASK_LEN; i++) 231 ht_cap.mcs.rx_mask[i] = 232 own_cap.mcs.rx_mask[i] & 233 ht_cap_ie->mcs.rx_mask[i]; 234 235 /* handle MCS rate 32 too */ 236 if (own_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1) 237 ht_cap.mcs.rx_mask[32/8] |= 1; 238 239 /* set Rx highest rate */ 240 ht_cap.mcs.rx_highest = ht_cap_ie->mcs.rx_highest; 241 242 if (ht_cap.cap & IEEE80211_HT_CAP_MAX_AMSDU) 243 sta->sta.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_7935; 244 else 245 sta->sta.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_3839; 246 247 apply: 248 changed = memcmp(&sta->sta.ht_cap, &ht_cap, sizeof(ht_cap)); 249 250 memcpy(&sta->sta.ht_cap, &ht_cap, sizeof(ht_cap)); 251 252 switch (sdata->vif.bss_conf.chandef.width) { 253 default: 254 WARN_ON_ONCE(1); 255 /* fall through */ 256 case NL80211_CHAN_WIDTH_20_NOHT: 257 case NL80211_CHAN_WIDTH_20: 258 bw = IEEE80211_STA_RX_BW_20; 259 break; 260 case NL80211_CHAN_WIDTH_40: 261 case NL80211_CHAN_WIDTH_80: 262 case NL80211_CHAN_WIDTH_80P80: 263 case NL80211_CHAN_WIDTH_160: 264 bw = ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ? 265 IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20; 266 break; 267 } 268 269 sta->sta.bandwidth = bw; 270 271 sta->cur_max_bandwidth = 272 ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ? 273 IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20; 274 275 switch ((ht_cap.cap & IEEE80211_HT_CAP_SM_PS) 276 >> IEEE80211_HT_CAP_SM_PS_SHIFT) { 277 case WLAN_HT_CAP_SM_PS_INVALID: 278 case WLAN_HT_CAP_SM_PS_STATIC: 279 smps_mode = IEEE80211_SMPS_STATIC; 280 break; 281 case WLAN_HT_CAP_SM_PS_DYNAMIC: 282 smps_mode = IEEE80211_SMPS_DYNAMIC; 283 break; 284 case WLAN_HT_CAP_SM_PS_DISABLED: 285 smps_mode = IEEE80211_SMPS_OFF; 286 break; 287 } 288 289 if (smps_mode != sta->sta.smps_mode) 290 changed = true; 291 sta->sta.smps_mode = smps_mode; 292 293 return changed; 294 } 295 296 void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta, 297 enum ieee80211_agg_stop_reason reason) 298 { 299 int i; 300 301 mutex_lock(&sta->ampdu_mlme.mtx); 302 for (i = 0; i < IEEE80211_NUM_TIDS; i++) 303 ___ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT, 304 WLAN_REASON_QSTA_LEAVE_QBSS, 305 reason != AGG_STOP_DESTROY_STA && 306 reason != AGG_STOP_PEER_REQUEST); 307 308 for (i = 0; i < IEEE80211_NUM_TIDS; i++) 309 ___ieee80211_stop_tx_ba_session(sta, i, reason); 310 mutex_unlock(&sta->ampdu_mlme.mtx); 311 312 /* 313 * In case the tear down is part of a reconfigure due to HW restart 314 * request, it is possible that the low level driver requested to stop 315 * the BA session, so handle it to properly clean tid_tx data. 316 */ 317 if(reason == AGG_STOP_DESTROY_STA) { 318 cancel_work_sync(&sta->ampdu_mlme.work); 319 320 mutex_lock(&sta->ampdu_mlme.mtx); 321 for (i = 0; i < IEEE80211_NUM_TIDS; i++) { 322 struct tid_ampdu_tx *tid_tx = 323 rcu_dereference_protected_tid_tx(sta, i); 324 325 if (!tid_tx) 326 continue; 327 328 if (test_and_clear_bit(HT_AGG_STATE_STOP_CB, &tid_tx->state)) 329 ieee80211_stop_tx_ba_cb(sta, i, tid_tx); 330 } 331 mutex_unlock(&sta->ampdu_mlme.mtx); 332 } 333 } 334 335 void ieee80211_ba_session_work(struct work_struct *work) 336 { 337 struct sta_info *sta = 338 container_of(work, struct sta_info, ampdu_mlme.work); 339 struct tid_ampdu_tx *tid_tx; 340 bool blocked; 341 int tid; 342 343 /* When this flag is set, new sessions should be blocked. */ 344 blocked = test_sta_flag(sta, WLAN_STA_BLOCK_BA); 345 346 mutex_lock(&sta->ampdu_mlme.mtx); 347 for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) { 348 if (test_and_clear_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired)) 349 ___ieee80211_stop_rx_ba_session( 350 sta, tid, WLAN_BACK_RECIPIENT, 351 WLAN_REASON_QSTA_TIMEOUT, true); 352 353 if (test_and_clear_bit(tid, 354 sta->ampdu_mlme.tid_rx_stop_requested)) 355 ___ieee80211_stop_rx_ba_session( 356 sta, tid, WLAN_BACK_RECIPIENT, 357 WLAN_REASON_UNSPECIFIED, true); 358 359 if (!blocked && 360 test_and_clear_bit(tid, 361 sta->ampdu_mlme.tid_rx_manage_offl)) 362 ___ieee80211_start_rx_ba_session(sta, 0, 0, 0, 1, tid, 363 IEEE80211_MAX_AMPDU_BUF_HT, 364 false, true); 365 366 if (test_and_clear_bit(tid + IEEE80211_NUM_TIDS, 367 sta->ampdu_mlme.tid_rx_manage_offl)) 368 ___ieee80211_stop_rx_ba_session( 369 sta, tid, WLAN_BACK_RECIPIENT, 370 0, false); 371 372 spin_lock_bh(&sta->lock); 373 374 tid_tx = sta->ampdu_mlme.tid_start_tx[tid]; 375 if (!blocked && tid_tx) { 376 /* 377 * Assign it over to the normal tid_tx array 378 * where it "goes live". 379 */ 380 381 sta->ampdu_mlme.tid_start_tx[tid] = NULL; 382 /* could there be a race? */ 383 if (sta->ampdu_mlme.tid_tx[tid]) 384 kfree(tid_tx); 385 else 386 ieee80211_assign_tid_tx(sta, tid, tid_tx); 387 spin_unlock_bh(&sta->lock); 388 389 ieee80211_tx_ba_session_handle_start(sta, tid); 390 continue; 391 } 392 spin_unlock_bh(&sta->lock); 393 394 tid_tx = rcu_dereference_protected_tid_tx(sta, tid); 395 if (!tid_tx) 396 continue; 397 398 if (!blocked && 399 test_and_clear_bit(HT_AGG_STATE_START_CB, &tid_tx->state)) 400 ieee80211_start_tx_ba_cb(sta, tid, tid_tx); 401 if (test_and_clear_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state)) 402 ___ieee80211_stop_tx_ba_session(sta, tid, 403 AGG_STOP_LOCAL_REQUEST); 404 if (test_and_clear_bit(HT_AGG_STATE_STOP_CB, &tid_tx->state)) 405 ieee80211_stop_tx_ba_cb(sta, tid, tid_tx); 406 } 407 mutex_unlock(&sta->ampdu_mlme.mtx); 408 } 409 410 void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata, 411 const u8 *da, u16 tid, 412 u16 initiator, u16 reason_code) 413 { 414 struct ieee80211_local *local = sdata->local; 415 struct sk_buff *skb; 416 struct ieee80211_mgmt *mgmt; 417 u16 params; 418 419 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); 420 if (!skb) 421 return; 422 423 skb_reserve(skb, local->hw.extra_tx_headroom); 424 mgmt = skb_put_zero(skb, 24); 425 memcpy(mgmt->da, da, ETH_ALEN); 426 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 427 if (sdata->vif.type == NL80211_IFTYPE_AP || 428 sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 429 sdata->vif.type == NL80211_IFTYPE_MESH_POINT) 430 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); 431 else if (sdata->vif.type == NL80211_IFTYPE_STATION) 432 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); 433 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 434 memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN); 435 436 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 437 IEEE80211_STYPE_ACTION); 438 439 skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba)); 440 441 mgmt->u.action.category = WLAN_CATEGORY_BACK; 442 mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA; 443 params = (u16)(initiator << 11); /* bit 11 initiator */ 444 params |= (u16)(tid << 12); /* bit 15:12 TID number */ 445 446 mgmt->u.action.u.delba.params = cpu_to_le16(params); 447 mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code); 448 449 ieee80211_tx_skb(sdata, skb); 450 } 451 452 void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata, 453 struct sta_info *sta, 454 struct ieee80211_mgmt *mgmt, size_t len) 455 { 456 u16 tid, params; 457 u16 initiator; 458 459 params = le16_to_cpu(mgmt->u.action.u.delba.params); 460 tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12; 461 initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11; 462 463 ht_dbg_ratelimited(sdata, "delba from %pM (%s) tid %d reason code %d\n", 464 mgmt->sa, initiator ? "initiator" : "recipient", 465 tid, 466 le16_to_cpu(mgmt->u.action.u.delba.reason_code)); 467 468 if (initiator == WLAN_BACK_INITIATOR) 469 __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0, 470 true); 471 else 472 __ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_PEER_REQUEST); 473 } 474 475 enum nl80211_smps_mode 476 ieee80211_smps_mode_to_smps_mode(enum ieee80211_smps_mode smps) 477 { 478 switch (smps) { 479 case IEEE80211_SMPS_OFF: 480 return NL80211_SMPS_OFF; 481 case IEEE80211_SMPS_STATIC: 482 return NL80211_SMPS_STATIC; 483 case IEEE80211_SMPS_DYNAMIC: 484 return NL80211_SMPS_DYNAMIC; 485 default: 486 return NL80211_SMPS_OFF; 487 } 488 } 489 490 int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata, 491 enum ieee80211_smps_mode smps, const u8 *da, 492 const u8 *bssid) 493 { 494 struct ieee80211_local *local = sdata->local; 495 struct sk_buff *skb; 496 struct ieee80211_mgmt *action_frame; 497 498 /* 27 = header + category + action + smps mode */ 499 skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom); 500 if (!skb) 501 return -ENOMEM; 502 503 skb_reserve(skb, local->hw.extra_tx_headroom); 504 action_frame = skb_put(skb, 27); 505 memcpy(action_frame->da, da, ETH_ALEN); 506 memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN); 507 memcpy(action_frame->bssid, bssid, ETH_ALEN); 508 action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 509 IEEE80211_STYPE_ACTION); 510 action_frame->u.action.category = WLAN_CATEGORY_HT; 511 action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS; 512 switch (smps) { 513 case IEEE80211_SMPS_AUTOMATIC: 514 case IEEE80211_SMPS_NUM_MODES: 515 WARN_ON(1); 516 /* fall through */ 517 case IEEE80211_SMPS_OFF: 518 action_frame->u.action.u.ht_smps.smps_control = 519 WLAN_HT_SMPS_CONTROL_DISABLED; 520 break; 521 case IEEE80211_SMPS_STATIC: 522 action_frame->u.action.u.ht_smps.smps_control = 523 WLAN_HT_SMPS_CONTROL_STATIC; 524 break; 525 case IEEE80211_SMPS_DYNAMIC: 526 action_frame->u.action.u.ht_smps.smps_control = 527 WLAN_HT_SMPS_CONTROL_DYNAMIC; 528 break; 529 } 530 531 /* we'll do more on status of this frame */ 532 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 533 ieee80211_tx_skb(sdata, skb); 534 535 return 0; 536 } 537 538 void ieee80211_request_smps_mgd_work(struct work_struct *work) 539 { 540 struct ieee80211_sub_if_data *sdata = 541 container_of(work, struct ieee80211_sub_if_data, 542 u.mgd.request_smps_work); 543 544 sdata_lock(sdata); 545 __ieee80211_request_smps_mgd(sdata, sdata->u.mgd.driver_smps_mode); 546 sdata_unlock(sdata); 547 } 548 549 void ieee80211_request_smps_ap_work(struct work_struct *work) 550 { 551 struct ieee80211_sub_if_data *sdata = 552 container_of(work, struct ieee80211_sub_if_data, 553 u.ap.request_smps_work); 554 555 sdata_lock(sdata); 556 if (sdata_dereference(sdata->u.ap.beacon, sdata)) 557 __ieee80211_request_smps_ap(sdata, 558 sdata->u.ap.driver_smps_mode); 559 sdata_unlock(sdata); 560 } 561 562 void ieee80211_request_smps(struct ieee80211_vif *vif, 563 enum ieee80211_smps_mode smps_mode) 564 { 565 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 566 567 if (WARN_ON_ONCE(vif->type != NL80211_IFTYPE_STATION && 568 vif->type != NL80211_IFTYPE_AP)) 569 return; 570 571 if (vif->type == NL80211_IFTYPE_STATION) { 572 if (sdata->u.mgd.driver_smps_mode == smps_mode) 573 return; 574 sdata->u.mgd.driver_smps_mode = smps_mode; 575 ieee80211_queue_work(&sdata->local->hw, 576 &sdata->u.mgd.request_smps_work); 577 } else { 578 /* AUTOMATIC is meaningless in AP mode */ 579 if (WARN_ON_ONCE(smps_mode == IEEE80211_SMPS_AUTOMATIC)) 580 return; 581 if (sdata->u.ap.driver_smps_mode == smps_mode) 582 return; 583 sdata->u.ap.driver_smps_mode = smps_mode; 584 ieee80211_queue_work(&sdata->local->hw, 585 &sdata->u.ap.request_smps_work); 586 } 587 } 588 /* this might change ... don't want non-open drivers using it */ 589 EXPORT_SYMBOL_GPL(ieee80211_request_smps); 590