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 * Copyright(c) 2020-2023 Intel Corporation 13 */ 14 15 #include <linux/ieee80211.h> 16 #include <linux/export.h> 17 #include <net/mac80211.h> 18 #include "ieee80211_i.h" 19 #include "rate.h" 20 21 static void __check_htcap_disable(struct ieee80211_ht_cap *ht_capa, 22 struct ieee80211_ht_cap *ht_capa_mask, 23 struct ieee80211_sta_ht_cap *ht_cap, 24 u16 flag) 25 { 26 __le16 le_flag = cpu_to_le16(flag); 27 if (ht_capa_mask->cap_info & le_flag) { 28 if (!(ht_capa->cap_info & le_flag)) 29 ht_cap->cap &= ~flag; 30 } 31 } 32 33 static void __check_htcap_enable(struct ieee80211_ht_cap *ht_capa, 34 struct ieee80211_ht_cap *ht_capa_mask, 35 struct ieee80211_sta_ht_cap *ht_cap, 36 u16 flag) 37 { 38 __le16 le_flag = cpu_to_le16(flag); 39 40 if ((ht_capa_mask->cap_info & le_flag) && 41 (ht_capa->cap_info & le_flag)) 42 ht_cap->cap |= flag; 43 } 44 45 void ieee80211_apply_htcap_overrides(struct ieee80211_sub_if_data *sdata, 46 struct ieee80211_sta_ht_cap *ht_cap) 47 { 48 struct ieee80211_ht_cap *ht_capa, *ht_capa_mask; 49 u8 *scaps, *smask; 50 int i; 51 52 if (!ht_cap->ht_supported) 53 return; 54 55 switch (sdata->vif.type) { 56 case NL80211_IFTYPE_STATION: 57 ht_capa = &sdata->u.mgd.ht_capa; 58 ht_capa_mask = &sdata->u.mgd.ht_capa_mask; 59 break; 60 case NL80211_IFTYPE_ADHOC: 61 ht_capa = &sdata->u.ibss.ht_capa; 62 ht_capa_mask = &sdata->u.ibss.ht_capa_mask; 63 break; 64 default: 65 WARN_ON_ONCE(1); 66 return; 67 } 68 69 scaps = (u8 *)(&ht_capa->mcs.rx_mask); 70 smask = (u8 *)(&ht_capa_mask->mcs.rx_mask); 71 72 /* NOTE: If you add more over-rides here, update register_hw 73 * ht_capa_mod_mask logic in main.c as well. 74 * And, if this method can ever change ht_cap.ht_supported, fix 75 * the check in ieee80211_add_ht_ie. 76 */ 77 78 /* check for HT over-rides, MCS rates first. */ 79 for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++) { 80 u8 m = smask[i]; 81 ht_cap->mcs.rx_mask[i] &= ~m; /* turn off all masked bits */ 82 /* Add back rates that are supported */ 83 ht_cap->mcs.rx_mask[i] |= (m & scaps[i]); 84 } 85 86 /* Force removal of HT-40 capabilities? */ 87 __check_htcap_disable(ht_capa, ht_capa_mask, ht_cap, 88 IEEE80211_HT_CAP_SUP_WIDTH_20_40); 89 __check_htcap_disable(ht_capa, ht_capa_mask, ht_cap, 90 IEEE80211_HT_CAP_SGI_40); 91 92 /* Allow user to disable SGI-20 (SGI-40 is handled above) */ 93 __check_htcap_disable(ht_capa, ht_capa_mask, ht_cap, 94 IEEE80211_HT_CAP_SGI_20); 95 96 /* Allow user to disable the max-AMSDU bit. */ 97 __check_htcap_disable(ht_capa, ht_capa_mask, ht_cap, 98 IEEE80211_HT_CAP_MAX_AMSDU); 99 100 /* Allow user to disable LDPC */ 101 __check_htcap_disable(ht_capa, ht_capa_mask, ht_cap, 102 IEEE80211_HT_CAP_LDPC_CODING); 103 104 /* Allow user to enable 40 MHz intolerant bit. */ 105 __check_htcap_enable(ht_capa, ht_capa_mask, ht_cap, 106 IEEE80211_HT_CAP_40MHZ_INTOLERANT); 107 108 /* Allow user to enable TX STBC bit */ 109 __check_htcap_enable(ht_capa, ht_capa_mask, ht_cap, 110 IEEE80211_HT_CAP_TX_STBC); 111 112 /* Allow user to configure RX STBC bits */ 113 if (ht_capa_mask->cap_info & cpu_to_le16(IEEE80211_HT_CAP_RX_STBC)) 114 ht_cap->cap |= le16_to_cpu(ht_capa->cap_info) & 115 IEEE80211_HT_CAP_RX_STBC; 116 117 /* Allow user to decrease AMPDU factor */ 118 if (ht_capa_mask->ampdu_params_info & 119 IEEE80211_HT_AMPDU_PARM_FACTOR) { 120 u8 n = ht_capa->ampdu_params_info & 121 IEEE80211_HT_AMPDU_PARM_FACTOR; 122 if (n < ht_cap->ampdu_factor) 123 ht_cap->ampdu_factor = n; 124 } 125 126 /* Allow the user to increase AMPDU density. */ 127 if (ht_capa_mask->ampdu_params_info & 128 IEEE80211_HT_AMPDU_PARM_DENSITY) { 129 u8 n = (ht_capa->ampdu_params_info & 130 IEEE80211_HT_AMPDU_PARM_DENSITY) 131 >> IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT; 132 if (n > ht_cap->ampdu_density) 133 ht_cap->ampdu_density = n; 134 } 135 } 136 137 138 bool ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_sub_if_data *sdata, 139 struct ieee80211_supported_band *sband, 140 const struct ieee80211_ht_cap *ht_cap_ie, 141 struct link_sta_info *link_sta) 142 { 143 struct ieee80211_bss_conf *link_conf; 144 struct sta_info *sta = link_sta->sta; 145 struct ieee80211_sta_ht_cap ht_cap, own_cap; 146 u8 ampdu_info, tx_mcs_set_cap; 147 int i, max_tx_streams; 148 bool changed; 149 enum ieee80211_sta_rx_bandwidth bw; 150 enum nl80211_chan_width width; 151 152 memset(&ht_cap, 0, sizeof(ht_cap)); 153 154 if (!ht_cap_ie || !sband->ht_cap.ht_supported) 155 goto apply; 156 157 ht_cap.ht_supported = true; 158 159 own_cap = sband->ht_cap; 160 161 /* 162 * If user has specified capability over-rides, take care 163 * of that if the station we're setting up is the AP or TDLS peer that 164 * we advertised a restricted capability set to. Override 165 * our own capabilities and then use those below. 166 */ 167 if (sdata->vif.type == NL80211_IFTYPE_STATION || 168 sdata->vif.type == NL80211_IFTYPE_ADHOC) 169 ieee80211_apply_htcap_overrides(sdata, &own_cap); 170 171 /* 172 * The bits listed in this expression should be 173 * the same for the peer and us, if the station 174 * advertises more then we can't use those thus 175 * we mask them out. 176 */ 177 ht_cap.cap = le16_to_cpu(ht_cap_ie->cap_info) & 178 (own_cap.cap | ~(IEEE80211_HT_CAP_LDPC_CODING | 179 IEEE80211_HT_CAP_SUP_WIDTH_20_40 | 180 IEEE80211_HT_CAP_GRN_FLD | 181 IEEE80211_HT_CAP_SGI_20 | 182 IEEE80211_HT_CAP_SGI_40 | 183 IEEE80211_HT_CAP_DSSSCCK40)); 184 185 /* 186 * The STBC bits are asymmetric -- if we don't have 187 * TX then mask out the peer's RX and vice versa. 188 */ 189 if (!(own_cap.cap & IEEE80211_HT_CAP_TX_STBC)) 190 ht_cap.cap &= ~IEEE80211_HT_CAP_RX_STBC; 191 if (!(own_cap.cap & IEEE80211_HT_CAP_RX_STBC)) 192 ht_cap.cap &= ~IEEE80211_HT_CAP_TX_STBC; 193 194 ampdu_info = ht_cap_ie->ampdu_params_info; 195 ht_cap.ampdu_factor = 196 ampdu_info & IEEE80211_HT_AMPDU_PARM_FACTOR; 197 ht_cap.ampdu_density = 198 (ampdu_info & IEEE80211_HT_AMPDU_PARM_DENSITY) >> 2; 199 200 /* own MCS TX capabilities */ 201 tx_mcs_set_cap = own_cap.mcs.tx_params; 202 203 /* Copy peer MCS TX capabilities, the driver might need them. */ 204 ht_cap.mcs.tx_params = ht_cap_ie->mcs.tx_params; 205 206 /* can we TX with MCS rates? */ 207 if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED)) 208 goto apply; 209 210 /* Counting from 0, therefore +1 */ 211 if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF) 212 max_tx_streams = 213 ((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK) 214 >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1; 215 else 216 max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS; 217 218 /* 219 * 802.11n-2009 20.3.5 / 20.6 says: 220 * - indices 0 to 7 and 32 are single spatial stream 221 * - 8 to 31 are multiple spatial streams using equal modulation 222 * [8..15 for two streams, 16..23 for three and 24..31 for four] 223 * - remainder are multiple spatial streams using unequal modulation 224 */ 225 for (i = 0; i < max_tx_streams; i++) 226 ht_cap.mcs.rx_mask[i] = 227 own_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i]; 228 229 if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION) 230 for (i = IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE; 231 i < IEEE80211_HT_MCS_MASK_LEN; i++) 232 ht_cap.mcs.rx_mask[i] = 233 own_cap.mcs.rx_mask[i] & 234 ht_cap_ie->mcs.rx_mask[i]; 235 236 /* handle MCS rate 32 too */ 237 if (own_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1) 238 ht_cap.mcs.rx_mask[32/8] |= 1; 239 240 /* set Rx highest rate */ 241 ht_cap.mcs.rx_highest = ht_cap_ie->mcs.rx_highest; 242 243 if (ht_cap.cap & IEEE80211_HT_CAP_MAX_AMSDU) 244 link_sta->pub->agg.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_7935; 245 else 246 link_sta->pub->agg.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_3839; 247 248 ieee80211_sta_recalc_aggregates(&sta->sta); 249 250 apply: 251 changed = memcmp(&link_sta->pub->ht_cap, &ht_cap, sizeof(ht_cap)); 252 253 memcpy(&link_sta->pub->ht_cap, &ht_cap, sizeof(ht_cap)); 254 255 rcu_read_lock(); 256 link_conf = rcu_dereference(sdata->vif.link_conf[link_sta->link_id]); 257 if (WARN_ON(!link_conf)) 258 width = NL80211_CHAN_WIDTH_20_NOHT; 259 else 260 width = link_conf->chandef.width; 261 262 switch (width) { 263 default: 264 WARN_ON_ONCE(1); 265 fallthrough; 266 case NL80211_CHAN_WIDTH_20_NOHT: 267 case NL80211_CHAN_WIDTH_20: 268 bw = IEEE80211_STA_RX_BW_20; 269 break; 270 case NL80211_CHAN_WIDTH_40: 271 case NL80211_CHAN_WIDTH_80: 272 case NL80211_CHAN_WIDTH_80P80: 273 case NL80211_CHAN_WIDTH_160: 274 case NL80211_CHAN_WIDTH_320: 275 bw = ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ? 276 IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20; 277 break; 278 } 279 rcu_read_unlock(); 280 281 link_sta->pub->bandwidth = bw; 282 283 link_sta->cur_max_bandwidth = 284 ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ? 285 IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20; 286 287 if (sta->sdata->vif.type == NL80211_IFTYPE_AP || 288 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { 289 enum ieee80211_smps_mode smps_mode; 290 291 switch ((ht_cap.cap & IEEE80211_HT_CAP_SM_PS) 292 >> IEEE80211_HT_CAP_SM_PS_SHIFT) { 293 case WLAN_HT_CAP_SM_PS_INVALID: 294 case WLAN_HT_CAP_SM_PS_STATIC: 295 smps_mode = IEEE80211_SMPS_STATIC; 296 break; 297 case WLAN_HT_CAP_SM_PS_DYNAMIC: 298 smps_mode = IEEE80211_SMPS_DYNAMIC; 299 break; 300 case WLAN_HT_CAP_SM_PS_DISABLED: 301 smps_mode = IEEE80211_SMPS_OFF; 302 break; 303 } 304 305 if (smps_mode != link_sta->pub->smps_mode) 306 changed = true; 307 link_sta->pub->smps_mode = smps_mode; 308 } else { 309 link_sta->pub->smps_mode = IEEE80211_SMPS_OFF; 310 } 311 312 return changed; 313 } 314 315 void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta, 316 enum ieee80211_agg_stop_reason reason) 317 { 318 int i; 319 320 mutex_lock(&sta->ampdu_mlme.mtx); 321 for (i = 0; i < IEEE80211_NUM_TIDS; i++) 322 ___ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT, 323 WLAN_REASON_QSTA_LEAVE_QBSS, 324 reason != AGG_STOP_DESTROY_STA && 325 reason != AGG_STOP_PEER_REQUEST); 326 327 for (i = 0; i < IEEE80211_NUM_TIDS; i++) 328 ___ieee80211_stop_tx_ba_session(sta, i, reason); 329 mutex_unlock(&sta->ampdu_mlme.mtx); 330 331 /* 332 * In case the tear down is part of a reconfigure due to HW restart 333 * request, it is possible that the low level driver requested to stop 334 * the BA session, so handle it to properly clean tid_tx data. 335 */ 336 if(reason == AGG_STOP_DESTROY_STA) { 337 cancel_work_sync(&sta->ampdu_mlme.work); 338 339 mutex_lock(&sta->ampdu_mlme.mtx); 340 for (i = 0; i < IEEE80211_NUM_TIDS; i++) { 341 struct tid_ampdu_tx *tid_tx = 342 rcu_dereference_protected_tid_tx(sta, i); 343 344 if (!tid_tx) 345 continue; 346 347 if (test_and_clear_bit(HT_AGG_STATE_STOP_CB, &tid_tx->state)) 348 ieee80211_stop_tx_ba_cb(sta, i, tid_tx); 349 } 350 mutex_unlock(&sta->ampdu_mlme.mtx); 351 } 352 } 353 354 void ieee80211_ba_session_work(struct work_struct *work) 355 { 356 struct sta_info *sta = 357 container_of(work, struct sta_info, ampdu_mlme.work); 358 struct tid_ampdu_tx *tid_tx; 359 bool blocked; 360 int tid; 361 362 /* When this flag is set, new sessions should be blocked. */ 363 blocked = test_sta_flag(sta, WLAN_STA_BLOCK_BA); 364 365 mutex_lock(&sta->ampdu_mlme.mtx); 366 for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) { 367 if (test_and_clear_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired)) 368 ___ieee80211_stop_rx_ba_session( 369 sta, tid, WLAN_BACK_RECIPIENT, 370 WLAN_REASON_QSTA_TIMEOUT, true); 371 372 if (test_and_clear_bit(tid, 373 sta->ampdu_mlme.tid_rx_stop_requested)) 374 ___ieee80211_stop_rx_ba_session( 375 sta, tid, WLAN_BACK_RECIPIENT, 376 WLAN_REASON_UNSPECIFIED, true); 377 378 if (!blocked && 379 test_and_clear_bit(tid, 380 sta->ampdu_mlme.tid_rx_manage_offl)) 381 ___ieee80211_start_rx_ba_session(sta, 0, 0, 0, 1, tid, 382 IEEE80211_MAX_AMPDU_BUF_HT, 383 false, true, NULL); 384 385 if (test_and_clear_bit(tid + IEEE80211_NUM_TIDS, 386 sta->ampdu_mlme.tid_rx_manage_offl)) 387 ___ieee80211_stop_rx_ba_session( 388 sta, tid, WLAN_BACK_RECIPIENT, 389 0, false); 390 391 spin_lock_bh(&sta->lock); 392 393 tid_tx = sta->ampdu_mlme.tid_start_tx[tid]; 394 if (!blocked && tid_tx) { 395 struct txq_info *txqi = to_txq_info(sta->sta.txq[tid]); 396 struct ieee80211_sub_if_data *sdata = 397 vif_to_sdata(txqi->txq.vif); 398 struct fq *fq = &sdata->local->fq; 399 400 spin_lock_bh(&fq->lock); 401 402 /* Allow only frags to be dequeued */ 403 set_bit(IEEE80211_TXQ_STOP, &txqi->flags); 404 405 if (!skb_queue_empty(&txqi->frags)) { 406 /* Fragmented Tx is ongoing, wait for it to 407 * finish. Reschedule worker to retry later. 408 */ 409 410 spin_unlock_bh(&fq->lock); 411 spin_unlock_bh(&sta->lock); 412 413 /* Give the task working on the txq a chance 414 * to send out the queued frags 415 */ 416 synchronize_net(); 417 418 mutex_unlock(&sta->ampdu_mlme.mtx); 419 420 ieee80211_queue_work(&sdata->local->hw, work); 421 return; 422 } 423 424 spin_unlock_bh(&fq->lock); 425 426 /* 427 * Assign it over to the normal tid_tx array 428 * where it "goes live". 429 */ 430 431 sta->ampdu_mlme.tid_start_tx[tid] = NULL; 432 /* could there be a race? */ 433 if (sta->ampdu_mlme.tid_tx[tid]) 434 kfree(tid_tx); 435 else 436 ieee80211_assign_tid_tx(sta, tid, tid_tx); 437 spin_unlock_bh(&sta->lock); 438 439 ieee80211_tx_ba_session_handle_start(sta, tid); 440 continue; 441 } 442 spin_unlock_bh(&sta->lock); 443 444 tid_tx = rcu_dereference_protected_tid_tx(sta, tid); 445 if (!tid_tx) 446 continue; 447 448 if (!blocked && 449 test_and_clear_bit(HT_AGG_STATE_START_CB, &tid_tx->state)) 450 ieee80211_start_tx_ba_cb(sta, tid, tid_tx); 451 if (test_and_clear_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state)) 452 ___ieee80211_stop_tx_ba_session(sta, tid, 453 AGG_STOP_LOCAL_REQUEST); 454 if (test_and_clear_bit(HT_AGG_STATE_STOP_CB, &tid_tx->state)) 455 ieee80211_stop_tx_ba_cb(sta, tid, tid_tx); 456 } 457 mutex_unlock(&sta->ampdu_mlme.mtx); 458 } 459 460 void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata, 461 const u8 *da, u16 tid, 462 u16 initiator, u16 reason_code) 463 { 464 struct ieee80211_local *local = sdata->local; 465 struct sk_buff *skb; 466 struct ieee80211_mgmt *mgmt; 467 u16 params; 468 469 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); 470 if (!skb) 471 return; 472 473 skb_reserve(skb, local->hw.extra_tx_headroom); 474 mgmt = skb_put_zero(skb, 24); 475 memcpy(mgmt->da, da, ETH_ALEN); 476 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 477 if (sdata->vif.type == NL80211_IFTYPE_AP || 478 sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 479 sdata->vif.type == NL80211_IFTYPE_MESH_POINT) 480 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); 481 else if (sdata->vif.type == NL80211_IFTYPE_STATION) 482 memcpy(mgmt->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN); 483 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 484 memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN); 485 486 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 487 IEEE80211_STYPE_ACTION); 488 489 skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba)); 490 491 mgmt->u.action.category = WLAN_CATEGORY_BACK; 492 mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA; 493 params = (u16)(initiator << 11); /* bit 11 initiator */ 494 params |= (u16)(tid << 12); /* bit 15:12 TID number */ 495 496 mgmt->u.action.u.delba.params = cpu_to_le16(params); 497 mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code); 498 499 ieee80211_tx_skb(sdata, skb); 500 } 501 502 void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata, 503 struct sta_info *sta, 504 struct ieee80211_mgmt *mgmt, size_t len) 505 { 506 u16 tid, params; 507 u16 initiator; 508 509 params = le16_to_cpu(mgmt->u.action.u.delba.params); 510 tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12; 511 initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11; 512 513 ht_dbg_ratelimited(sdata, "delba from %pM (%s) tid %d reason code %d\n", 514 mgmt->sa, initiator ? "initiator" : "recipient", 515 tid, 516 le16_to_cpu(mgmt->u.action.u.delba.reason_code)); 517 518 if (initiator == WLAN_BACK_INITIATOR) 519 __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0, 520 true); 521 else 522 __ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_PEER_REQUEST); 523 } 524 525 enum nl80211_smps_mode 526 ieee80211_smps_mode_to_smps_mode(enum ieee80211_smps_mode smps) 527 { 528 switch (smps) { 529 case IEEE80211_SMPS_OFF: 530 return NL80211_SMPS_OFF; 531 case IEEE80211_SMPS_STATIC: 532 return NL80211_SMPS_STATIC; 533 case IEEE80211_SMPS_DYNAMIC: 534 return NL80211_SMPS_DYNAMIC; 535 default: 536 return NL80211_SMPS_OFF; 537 } 538 } 539 540 int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata, 541 enum ieee80211_smps_mode smps, const u8 *da, 542 const u8 *bssid) 543 { 544 struct ieee80211_local *local = sdata->local; 545 struct sk_buff *skb; 546 struct ieee80211_mgmt *action_frame; 547 548 /* 27 = header + category + action + smps mode */ 549 skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom); 550 if (!skb) 551 return -ENOMEM; 552 553 skb_reserve(skb, local->hw.extra_tx_headroom); 554 action_frame = skb_put(skb, 27); 555 memcpy(action_frame->da, da, ETH_ALEN); 556 memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN); 557 memcpy(action_frame->bssid, bssid, ETH_ALEN); 558 action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 559 IEEE80211_STYPE_ACTION); 560 action_frame->u.action.category = WLAN_CATEGORY_HT; 561 action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS; 562 switch (smps) { 563 case IEEE80211_SMPS_AUTOMATIC: 564 case IEEE80211_SMPS_NUM_MODES: 565 WARN_ON(1); 566 fallthrough; 567 case IEEE80211_SMPS_OFF: 568 action_frame->u.action.u.ht_smps.smps_control = 569 WLAN_HT_SMPS_CONTROL_DISABLED; 570 break; 571 case IEEE80211_SMPS_STATIC: 572 action_frame->u.action.u.ht_smps.smps_control = 573 WLAN_HT_SMPS_CONTROL_STATIC; 574 break; 575 case IEEE80211_SMPS_DYNAMIC: 576 action_frame->u.action.u.ht_smps.smps_control = 577 WLAN_HT_SMPS_CONTROL_DYNAMIC; 578 break; 579 } 580 581 /* we'll do more on status of this frame */ 582 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 583 ieee80211_tx_skb(sdata, skb); 584 585 return 0; 586 } 587 588 void ieee80211_request_smps(struct ieee80211_vif *vif, unsigned int link_id, 589 enum ieee80211_smps_mode smps_mode) 590 { 591 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 592 struct ieee80211_link_data *link; 593 594 if (WARN_ON_ONCE(vif->type != NL80211_IFTYPE_STATION)) 595 return; 596 597 rcu_read_lock(); 598 link = rcu_dereference(sdata->link[link_id]); 599 if (WARN_ON(!link)) 600 goto out; 601 602 if (link->u.mgd.driver_smps_mode == smps_mode) 603 goto out; 604 605 link->u.mgd.driver_smps_mode = smps_mode; 606 wiphy_work_queue(sdata->local->hw.wiphy, 607 &link->u.mgd.request_smps_work); 608 out: 609 rcu_read_unlock(); 610 } 611 /* this might change ... don't want non-open drivers using it */ 612 EXPORT_SYMBOL_GPL(ieee80211_request_smps); 613