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) 2020-2026 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 const struct ieee80211_sta_ht_cap *own_cap_ptr, 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 || !own_cap_ptr->ht_supported) 155 goto apply; 156 157 /* NDI station are using the capabilities from the NMI station */ 158 if (WARN_ON_ONCE(sdata->vif.type == NL80211_IFTYPE_NAN_DATA)) 159 return 0; 160 161 ht_cap.ht_supported = true; 162 163 own_cap = *own_cap_ptr; 164 165 /* 166 * If user has specified capability over-rides, take care 167 * of that if the station we're setting up is the AP or TDLS peer that 168 * we advertised a restricted capability set to. Override 169 * our own capabilities and then use those below. 170 */ 171 if (sdata->vif.type == NL80211_IFTYPE_STATION || 172 sdata->vif.type == NL80211_IFTYPE_ADHOC) 173 ieee80211_apply_htcap_overrides(sdata, &own_cap); 174 175 /* 176 * The bits listed in this expression should be 177 * the same for the peer and us, if the station 178 * advertises more then we can't use those thus 179 * we mask them out. 180 */ 181 ht_cap.cap = le16_to_cpu(ht_cap_ie->cap_info) & 182 (own_cap.cap | ~(IEEE80211_HT_CAP_LDPC_CODING | 183 IEEE80211_HT_CAP_SUP_WIDTH_20_40 | 184 IEEE80211_HT_CAP_GRN_FLD | 185 IEEE80211_HT_CAP_SGI_20 | 186 IEEE80211_HT_CAP_SGI_40 | 187 IEEE80211_HT_CAP_DSSSCCK40)); 188 189 /* 190 * The STBC bits are asymmetric -- if we don't have 191 * TX then mask out the peer's RX and vice versa. 192 */ 193 if (!(own_cap.cap & IEEE80211_HT_CAP_TX_STBC)) 194 ht_cap.cap &= ~IEEE80211_HT_CAP_RX_STBC; 195 if (!(own_cap.cap & IEEE80211_HT_CAP_RX_STBC)) 196 ht_cap.cap &= ~IEEE80211_HT_CAP_TX_STBC; 197 198 ampdu_info = ht_cap_ie->ampdu_params_info; 199 ht_cap.ampdu_factor = 200 ampdu_info & IEEE80211_HT_AMPDU_PARM_FACTOR; 201 ht_cap.ampdu_density = 202 (ampdu_info & IEEE80211_HT_AMPDU_PARM_DENSITY) >> 2; 203 204 /* own MCS TX capabilities */ 205 tx_mcs_set_cap = own_cap.mcs.tx_params; 206 207 /* Copy peer MCS TX capabilities, the driver might need them. */ 208 ht_cap.mcs.tx_params = ht_cap_ie->mcs.tx_params; 209 210 /* can we TX with MCS rates? */ 211 if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED)) 212 goto apply; 213 214 /* Counting from 0, therefore +1 */ 215 if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF) 216 max_tx_streams = 217 ((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK) 218 >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1; 219 else 220 max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS; 221 222 /* 223 * 802.11n-2009 20.3.5 / 20.6 says: 224 * - indices 0 to 7 and 32 are single spatial stream 225 * - 8 to 31 are multiple spatial streams using equal modulation 226 * [8..15 for two streams, 16..23 for three and 24..31 for four] 227 * - remainder are multiple spatial streams using unequal modulation 228 */ 229 for (i = 0; i < max_tx_streams; i++) 230 ht_cap.mcs.rx_mask[i] = 231 own_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i]; 232 233 if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION) 234 for (i = IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE; 235 i < IEEE80211_HT_MCS_MASK_LEN; i++) 236 ht_cap.mcs.rx_mask[i] = 237 own_cap.mcs.rx_mask[i] & 238 ht_cap_ie->mcs.rx_mask[i]; 239 240 /* handle MCS rate 32 too */ 241 if (own_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1) 242 ht_cap.mcs.rx_mask[32/8] |= 1; 243 244 /* set Rx highest rate */ 245 ht_cap.mcs.rx_highest = ht_cap_ie->mcs.rx_highest; 246 247 if (ht_cap.cap & IEEE80211_HT_CAP_MAX_AMSDU) 248 link_sta->pub->agg.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_7935; 249 else 250 link_sta->pub->agg.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_3839; 251 252 ieee80211_sta_recalc_aggregates(&sta->sta); 253 254 apply: 255 changed = memcmp(&link_sta->pub->ht_cap, &ht_cap, sizeof(ht_cap)); 256 257 memcpy(&link_sta->pub->ht_cap, &ht_cap, sizeof(ht_cap)); 258 259 rcu_read_lock(); 260 link_conf = rcu_dereference(sdata->vif.link_conf[link_sta->link_id]); 261 if (WARN_ON(!link_conf)) { 262 width = NL80211_CHAN_WIDTH_20_NOHT; 263 } else if (sdata->vif.type == NL80211_IFTYPE_NAN || 264 sdata->vif.type == NL80211_IFTYPE_NAN_DATA) { 265 /* In NAN, link_sta->bandwidth is invalid since NAN operates on 266 * multiple channels. Just take the maximum. 267 */ 268 width = NL80211_CHAN_WIDTH_320; 269 } else { 270 width = link_conf->chanreq.oper.width; 271 } 272 273 switch (width) { 274 default: 275 WARN_ON_ONCE(1); 276 fallthrough; 277 case NL80211_CHAN_WIDTH_20_NOHT: 278 case NL80211_CHAN_WIDTH_20: 279 bw = IEEE80211_STA_RX_BW_20; 280 break; 281 case NL80211_CHAN_WIDTH_40: 282 case NL80211_CHAN_WIDTH_80: 283 case NL80211_CHAN_WIDTH_80P80: 284 case NL80211_CHAN_WIDTH_160: 285 case NL80211_CHAN_WIDTH_320: 286 bw = ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ? 287 IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20; 288 break; 289 } 290 rcu_read_unlock(); 291 292 link_sta->pub->bandwidth = bw; 293 294 link_sta->cur_max_bandwidth = 295 ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ? 296 IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20; 297 298 if (sta->sdata->vif.type == NL80211_IFTYPE_AP || 299 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 300 sta->sdata->vif.type == NL80211_IFTYPE_NAN || 301 sta->sdata->vif.type == NL80211_IFTYPE_NAN_DATA) { 302 enum ieee80211_smps_mode smps_mode; 303 304 switch ((ht_cap.cap & IEEE80211_HT_CAP_SM_PS) 305 >> IEEE80211_HT_CAP_SM_PS_SHIFT) { 306 case WLAN_HT_CAP_SM_PS_INVALID: 307 case WLAN_HT_CAP_SM_PS_STATIC: 308 smps_mode = IEEE80211_SMPS_STATIC; 309 break; 310 case WLAN_HT_CAP_SM_PS_DYNAMIC: 311 smps_mode = IEEE80211_SMPS_DYNAMIC; 312 break; 313 case WLAN_HT_CAP_SM_PS_DISABLED: 314 smps_mode = IEEE80211_SMPS_OFF; 315 break; 316 } 317 318 if (smps_mode != link_sta->pub->smps_mode) 319 changed = true; 320 link_sta->pub->smps_mode = smps_mode; 321 } else { 322 link_sta->pub->smps_mode = IEEE80211_SMPS_OFF; 323 } 324 325 return changed; 326 } 327 328 void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta, 329 enum ieee80211_agg_stop_reason reason) 330 { 331 int i; 332 333 lockdep_assert_wiphy(sta->local->hw.wiphy); 334 335 for (i = 0; i < IEEE80211_NUM_TIDS; i++) 336 __ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT, 337 WLAN_REASON_QSTA_LEAVE_QBSS, 338 reason != AGG_STOP_DESTROY_STA && 339 reason != AGG_STOP_PEER_REQUEST); 340 341 for (i = 0; i < IEEE80211_NUM_TIDS; i++) 342 __ieee80211_stop_tx_ba_session(sta, i, reason); 343 344 /* 345 * In case the tear down is part of a reconfigure due to HW restart 346 * request, it is possible that the low level driver requested to stop 347 * the BA session, so handle it to properly clean tid_tx data. 348 */ 349 if(reason == AGG_STOP_DESTROY_STA) { 350 wiphy_work_cancel(sta->local->hw.wiphy, &sta->ampdu_mlme.work); 351 352 for (i = 0; i < IEEE80211_NUM_TIDS; i++) { 353 struct tid_ampdu_tx *tid_tx = 354 rcu_dereference_protected_tid_tx(sta, i); 355 356 if (!tid_tx) 357 continue; 358 359 if (test_and_clear_bit(HT_AGG_STATE_STOP_CB, &tid_tx->state)) 360 ieee80211_stop_tx_ba_cb(sta, i, tid_tx); 361 } 362 } 363 } 364 365 void ieee80211_ba_session_work(struct wiphy *wiphy, struct wiphy_work *work) 366 { 367 struct sta_info *sta = 368 container_of(work, struct sta_info, ampdu_mlme.work); 369 struct tid_ampdu_tx *tid_tx; 370 bool blocked; 371 int tid; 372 373 lockdep_assert_wiphy(sta->local->hw.wiphy); 374 375 /* When this flag is set, new sessions should be blocked. */ 376 blocked = test_sta_flag(sta, WLAN_STA_BLOCK_BA); 377 378 for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) { 379 if (test_and_clear_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired)) 380 __ieee80211_stop_rx_ba_session( 381 sta, tid, WLAN_BACK_RECIPIENT, 382 WLAN_REASON_QSTA_TIMEOUT, true); 383 384 if (test_and_clear_bit(tid, 385 sta->ampdu_mlme.tid_rx_stop_requested)) 386 __ieee80211_stop_rx_ba_session( 387 sta, tid, WLAN_BACK_RECIPIENT, 388 WLAN_REASON_UNSPECIFIED, true); 389 390 if (!blocked && 391 test_and_clear_bit(tid, 392 sta->ampdu_mlme.tid_rx_manage_offl)) 393 __ieee80211_start_rx_ba_session(sta, 0, 0, 0, 1, tid, 394 IEEE80211_MAX_AMPDU_BUF_HT, 395 false, true, false, 0); 396 397 if (test_and_clear_bit(tid + IEEE80211_NUM_TIDS, 398 sta->ampdu_mlme.tid_rx_manage_offl)) 399 __ieee80211_stop_rx_ba_session( 400 sta, tid, WLAN_BACK_RECIPIENT, 401 0, false); 402 403 spin_lock_bh(&sta->lock); 404 405 tid_tx = sta->ampdu_mlme.tid_start_tx[tid]; 406 if (!blocked && tid_tx) { 407 struct txq_info *txqi = to_txq_info(sta->sta.txq[tid]); 408 struct ieee80211_sub_if_data *sdata = 409 vif_to_sdata(txqi->txq.vif); 410 struct fq *fq = &sdata->local->fq; 411 412 spin_lock_bh(&fq->lock); 413 414 /* Allow only frags to be dequeued */ 415 set_bit(IEEE80211_TXQ_STOP, &txqi->flags); 416 417 if (!skb_queue_empty(&txqi->frags)) { 418 /* Fragmented Tx is ongoing, wait for it to 419 * finish. Reschedule worker to retry later. 420 */ 421 422 spin_unlock_bh(&fq->lock); 423 spin_unlock_bh(&sta->lock); 424 425 /* Give the task working on the txq a chance 426 * to send out the queued frags 427 */ 428 synchronize_net(); 429 430 wiphy_work_queue(sdata->local->hw.wiphy, work); 431 return; 432 } 433 434 spin_unlock_bh(&fq->lock); 435 436 /* 437 * Assign it over to the normal tid_tx array 438 * where it "goes live". 439 */ 440 441 sta->ampdu_mlme.tid_start_tx[tid] = NULL; 442 /* could there be a race? */ 443 if (sta->ampdu_mlme.tid_tx[tid]) 444 kfree(tid_tx); 445 else 446 ieee80211_assign_tid_tx(sta, tid, tid_tx); 447 spin_unlock_bh(&sta->lock); 448 449 ieee80211_tx_ba_session_handle_start(sta, tid); 450 continue; 451 } 452 spin_unlock_bh(&sta->lock); 453 454 tid_tx = rcu_dereference_protected_tid_tx(sta, tid); 455 if (!tid_tx) 456 continue; 457 458 if (!blocked && 459 test_and_clear_bit(HT_AGG_STATE_START_CB, &tid_tx->state)) 460 ieee80211_start_tx_ba_cb(sta, tid, tid_tx); 461 if (test_and_clear_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state)) 462 __ieee80211_stop_tx_ba_session(sta, tid, 463 AGG_STOP_LOCAL_REQUEST); 464 if (test_and_clear_bit(HT_AGG_STATE_STOP_CB, &tid_tx->state)) 465 ieee80211_stop_tx_ba_cb(sta, tid, tid_tx); 466 } 467 } 468 469 void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata, 470 const u8 *da, u16 tid, 471 u16 initiator, u16 reason_code, 472 bool use_ndp) 473 { 474 struct ieee80211_local *local = sdata->local; 475 struct sk_buff *skb; 476 struct ieee80211_mgmt *mgmt; 477 u16 params; 478 479 skb = dev_alloc_skb(IEEE80211_MIN_ACTION_SIZE(delba) + 480 local->hw.extra_tx_headroom); 481 if (!skb) 482 return; 483 484 skb_reserve(skb, local->hw.extra_tx_headroom); 485 mgmt = ieee80211_mgmt_ba(skb, da, sdata); 486 487 skb_put(skb, 2 + sizeof(mgmt->u.action.delba)); 488 489 mgmt->u.action.category = WLAN_CATEGORY_BACK; 490 mgmt->u.action.action_code = use_ndp ? 491 WLAN_ACTION_NDP_DELBA : WLAN_ACTION_DELBA; 492 params = (u16)(initiator << 11); /* bit 11 initiator */ 493 params |= (u16)(tid << 12); /* bit 15:12 TID number */ 494 495 mgmt->u.action.delba.params = cpu_to_le16(params); 496 mgmt->u.action.delba.reason_code = cpu_to_le16(reason_code); 497 498 ieee80211_tx_skb(sdata, skb); 499 } 500 501 void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata, 502 struct sta_info *sta, 503 struct ieee80211_mgmt *mgmt, size_t len) 504 { 505 u16 tid, params; 506 u16 initiator; 507 508 params = le16_to_cpu(mgmt->u.action.delba.params); 509 tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12; 510 initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11; 511 512 ht_dbg_ratelimited(sdata, "delba from %pM (%s) tid %d reason code %d\n", 513 mgmt->sa, initiator ? "initiator" : "recipient", 514 tid, 515 le16_to_cpu(mgmt->u.action.delba.reason_code)); 516 517 if (initiator == WLAN_BACK_INITIATOR) 518 __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0, 519 true); 520 else 521 __ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_PEER_REQUEST); 522 } 523 524 enum nl80211_smps_mode 525 ieee80211_smps_mode_to_smps_mode(enum ieee80211_smps_mode smps) 526 { 527 switch (smps) { 528 case IEEE80211_SMPS_OFF: 529 return NL80211_SMPS_OFF; 530 case IEEE80211_SMPS_STATIC: 531 return NL80211_SMPS_STATIC; 532 case IEEE80211_SMPS_DYNAMIC: 533 return NL80211_SMPS_DYNAMIC; 534 default: 535 return NL80211_SMPS_OFF; 536 } 537 } 538 539 int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata, 540 enum ieee80211_smps_mode smps, const u8 *da, 541 const u8 *bssid, int link_id) 542 { 543 struct ieee80211_local *local = sdata->local; 544 struct sk_buff *skb; 545 struct ieee80211_mgmt *action_frame; 546 struct ieee80211_tx_info *info; 547 u8 status_link_id = link_id < 0 ? 0 : link_id; 548 549 skb = dev_alloc_skb(IEEE80211_MIN_ACTION_SIZE(ht_smps) + 550 local->hw.extra_tx_headroom); 551 if (!skb) 552 return -ENOMEM; 553 554 skb_reserve(skb, local->hw.extra_tx_headroom); 555 action_frame = skb_put_zero(skb, IEEE80211_MIN_ACTION_SIZE(ht_smps)); 556 memcpy(action_frame->da, da, ETH_ALEN); 557 memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN); 558 memcpy(action_frame->bssid, bssid, ETH_ALEN); 559 action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 560 IEEE80211_STYPE_ACTION); 561 action_frame->u.action.category = WLAN_CATEGORY_HT; 562 action_frame->u.action.action_code = WLAN_HT_ACTION_SMPS; 563 switch (smps) { 564 case IEEE80211_SMPS_AUTOMATIC: 565 case IEEE80211_SMPS_NUM_MODES: 566 WARN_ON(1); 567 smps = IEEE80211_SMPS_OFF; 568 fallthrough; 569 case IEEE80211_SMPS_OFF: 570 action_frame->u.action.ht_smps.smps_control = 571 WLAN_HT_SMPS_CONTROL_DISABLED; 572 break; 573 case IEEE80211_SMPS_STATIC: 574 action_frame->u.action.ht_smps.smps_control = 575 WLAN_HT_SMPS_CONTROL_STATIC; 576 break; 577 case IEEE80211_SMPS_DYNAMIC: 578 action_frame->u.action.ht_smps.smps_control = 579 WLAN_HT_SMPS_CONTROL_DYNAMIC; 580 break; 581 } 582 583 /* we'll do more on status of this frame */ 584 info = IEEE80211_SKB_CB(skb); 585 info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 586 /* we have 13 bits, and need 6: link_id 4, smps 2 */ 587 info->status_data = IEEE80211_STATUS_TYPE_SMPS | 588 u16_encode_bits(status_link_id << 2 | smps, 589 IEEE80211_STATUS_SUBDATA_MASK); 590 ieee80211_tx_skb_tid(sdata, skb, 7, link_id); 591 592 return 0; 593 } 594 595 void ieee80211_request_smps(struct ieee80211_vif *vif, unsigned int link_id, 596 enum ieee80211_smps_mode smps_mode) 597 { 598 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 599 struct ieee80211_link_data *link; 600 601 if (WARN_ON_ONCE(vif->type != NL80211_IFTYPE_STATION)) 602 return; 603 604 rcu_read_lock(); 605 link = rcu_dereference(sdata->link[link_id]); 606 if (WARN_ON(!link)) 607 goto out; 608 609 trace_api_request_smps(sdata->local, sdata, link, smps_mode); 610 611 if (link->u.mgd.driver_smps_mode == smps_mode) 612 goto out; 613 614 link->u.mgd.driver_smps_mode = smps_mode; 615 wiphy_work_queue(sdata->local->hw.wiphy, 616 &link->u.mgd.request_smps_work); 617 out: 618 rcu_read_unlock(); 619 } 620 /* this might change ... don't want non-open drivers using it */ 621 EXPORT_SYMBOL_GPL(ieee80211_request_smps); 622 623 void ieee80211_ht_handle_chanwidth_notif(struct ieee80211_local *local, 624 struct ieee80211_sub_if_data *sdata, 625 struct sta_info *sta, 626 struct link_sta_info *link_sta, 627 u8 chanwidth, enum nl80211_band band) 628 { 629 enum ieee80211_sta_rx_bandwidth max_bw, new_bw; 630 struct ieee80211_supported_band *sband; 631 struct sta_opmode_info sta_opmode = {}; 632 633 lockdep_assert_wiphy(local->hw.wiphy); 634 635 if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ) 636 max_bw = IEEE80211_STA_RX_BW_20; 637 else 638 max_bw = ieee80211_sta_cap_rx_bw(link_sta); 639 640 /* set cur_max_bandwidth and recalc sta bw */ 641 link_sta->cur_max_bandwidth = max_bw; 642 new_bw = ieee80211_sta_cur_vht_bw(link_sta); 643 644 if (link_sta->pub->bandwidth == new_bw) 645 return; 646 647 link_sta->pub->bandwidth = new_bw; 648 sband = local->hw.wiphy->bands[band]; 649 sta_opmode.bw = 650 ieee80211_sta_rx_bw_to_chan_width(link_sta); 651 sta_opmode.changed = STA_OPMODE_MAX_BW_CHANGED; 652 653 rate_control_rate_update(local, sband, link_sta, 654 IEEE80211_RC_BW_CHANGED); 655 cfg80211_sta_opmode_change_notify(sdata->dev, 656 sta->addr, 657 &sta_opmode, 658 GFP_KERNEL); 659 } 660