1 // SPDX-License-Identifier: GPL-2.0-only
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) 2020-2022 Intel Corporation
15 #include <linux/ieee80211.h>
16 #include <linux/export.h>
17 #include <net/mac80211.h>
18 #include "ieee80211_i.h"
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,
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))
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,
38 __le16 le_flag = cpu_to_le16(flag);
40 if ((ht_capa_mask->cap_info & le_flag) &&
41 (ht_capa->cap_info & le_flag))
45 void ieee80211_apply_htcap_overrides(struct ieee80211_sub_if_data *sdata,
46 struct ieee80211_sta_ht_cap *ht_cap)
48 struct ieee80211_ht_cap *ht_capa, *ht_capa_mask;
52 if (!ht_cap->ht_supported)
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;
60 case NL80211_IFTYPE_ADHOC:
61 ht_capa = &sdata->u.ibss.ht_capa;
62 ht_capa_mask = &sdata->u.ibss.ht_capa_mask;
69 scaps = (u8 *)(&ht_capa->mcs.rx_mask);
70 smask = (u8 *)(&ht_capa_mask->mcs.rx_mask);
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.
78 /* check for HT over-rides, MCS rates first. */
79 for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; 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]);
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);
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);
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);
100 /* Allow user to disable LDPC */
101 __check_htcap_disable(ht_capa, ht_capa_mask, ht_cap,
102 IEEE80211_HT_CAP_LDPC_CODING);
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);
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);
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;
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;
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;
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)
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;
149 enum ieee80211_sta_rx_bandwidth bw;
150 enum nl80211_chan_width width;
152 memset(&ht_cap, 0, sizeof(ht_cap));
154 if (!ht_cap_ie || !sband->ht_cap.ht_supported)
157 ht_cap.ht_supported = true;
159 own_cap = sband->ht_cap;
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.
167 if (sdata->vif.type == NL80211_IFTYPE_STATION ||
168 sdata->vif.type == NL80211_IFTYPE_ADHOC)
169 ieee80211_apply_htcap_overrides(sdata, &own_cap);
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
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));
186 * The STBC bits are asymmetric -- if we don't have
187 * TX then mask out the peer's RX and vice versa.
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;
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;
200 /* own MCS TX capabilities */
201 tx_mcs_set_cap = own_cap.mcs.tx_params;
203 /* Copy peer MCS TX capabilities, the driver might need them. */
204 ht_cap.mcs.tx_params = ht_cap_ie->mcs.tx_params;
206 /* can we TX with MCS rates? */
207 if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED))
210 /* Counting from 0, therefore +1 */
211 if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF)
213 ((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
214 >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
216 max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS;
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
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];
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];
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;
240 /* set Rx highest rate */
241 ht_cap.mcs.rx_highest = ht_cap_ie->mcs.rx_highest;
243 if (ht_cap.cap & IEEE80211_HT_CAP_MAX_AMSDU)
244 link_sta->pub->agg.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_7935;
246 link_sta->pub->agg.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_3839;
248 ieee80211_sta_recalc_aggregates(&sta->sta);
251 changed = memcmp(&link_sta->pub->ht_cap, &ht_cap, sizeof(ht_cap));
253 memcpy(&link_sta->pub->ht_cap, &ht_cap, sizeof(ht_cap));
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;
260 width = link_conf->chandef.width;
266 case NL80211_CHAN_WIDTH_20_NOHT:
267 case NL80211_CHAN_WIDTH_20:
268 bw = IEEE80211_STA_RX_BW_20;
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;
281 link_sta->pub->bandwidth = bw;
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;
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;
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;
297 case WLAN_HT_CAP_SM_PS_DYNAMIC:
298 smps_mode = IEEE80211_SMPS_DYNAMIC;
300 case WLAN_HT_CAP_SM_PS_DISABLED:
301 smps_mode = IEEE80211_SMPS_OFF;
305 if (smps_mode != link_sta->pub->smps_mode)
307 link_sta->pub->smps_mode = smps_mode;
309 link_sta->pub->smps_mode = IEEE80211_SMPS_OFF;
315 void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta,
316 enum ieee80211_agg_stop_reason reason)
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);
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);
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.
336 if(reason == AGG_STOP_DESTROY_STA) {
337 cancel_work_sync(&sta->ampdu_mlme.work);
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);
347 if (test_and_clear_bit(HT_AGG_STATE_STOP_CB, &tid_tx->state))
348 ieee80211_stop_tx_ba_cb(sta, i, tid_tx);
350 mutex_unlock(&sta->ampdu_mlme.mtx);
354 void ieee80211_ba_session_work(struct work_struct *work)
356 struct sta_info *sta =
357 container_of(work, struct sta_info, ampdu_mlme.work);
358 struct tid_ampdu_tx *tid_tx;
362 /* When this flag is set, new sessions should be blocked. */
363 blocked = test_sta_flag(sta, WLAN_STA_BLOCK_BA);
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);
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);
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,
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,
391 spin_lock_bh(&sta->lock);
393 tid_tx = sta->ampdu_mlme.tid_start_tx[tid];
394 if (!blocked && tid_tx) {
395 struct ieee80211_sub_if_data *sdata = sta->sdata;
396 struct ieee80211_local *local = sdata->local;
398 if (local->ops->wake_tx_queue) {
399 struct txq_info *txqi =
400 to_txq_info(sta->sta.txq[tid]);
401 struct fq *fq = &local->fq;
403 spin_lock_bh(&fq->lock);
405 /* Allow only frags to be dequeued */
406 set_bit(IEEE80211_TXQ_STOP, &txqi->flags);
408 if (!skb_queue_empty(&txqi->frags)) {
409 /* Fragmented Tx is ongoing, wait for it
410 * to finish. Reschedule worker to retry
414 spin_unlock_bh(&fq->lock);
415 spin_unlock_bh(&sta->lock);
417 /* Give the task working on the txq a
418 * chance to send out the queued frags
422 mutex_unlock(&sta->ampdu_mlme.mtx);
424 ieee80211_queue_work(&sdata->local->hw,
429 spin_unlock_bh(&fq->lock);
433 * Assign it over to the normal tid_tx array
434 * where it "goes live".
437 sta->ampdu_mlme.tid_start_tx[tid] = NULL;
438 /* could there be a race? */
439 if (sta->ampdu_mlme.tid_tx[tid])
442 ieee80211_assign_tid_tx(sta, tid, tid_tx);
443 spin_unlock_bh(&sta->lock);
445 ieee80211_tx_ba_session_handle_start(sta, tid);
448 spin_unlock_bh(&sta->lock);
450 tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
455 test_and_clear_bit(HT_AGG_STATE_START_CB, &tid_tx->state))
456 ieee80211_start_tx_ba_cb(sta, tid, tid_tx);
457 if (test_and_clear_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state))
458 ___ieee80211_stop_tx_ba_session(sta, tid,
459 AGG_STOP_LOCAL_REQUEST);
460 if (test_and_clear_bit(HT_AGG_STATE_STOP_CB, &tid_tx->state))
461 ieee80211_stop_tx_ba_cb(sta, tid, tid_tx);
463 mutex_unlock(&sta->ampdu_mlme.mtx);
466 void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
467 const u8 *da, u16 tid,
468 u16 initiator, u16 reason_code)
470 struct ieee80211_local *local = sdata->local;
472 struct ieee80211_mgmt *mgmt;
475 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
479 skb_reserve(skb, local->hw.extra_tx_headroom);
480 mgmt = skb_put_zero(skb, 24);
481 memcpy(mgmt->da, da, ETH_ALEN);
482 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
483 if (sdata->vif.type == NL80211_IFTYPE_AP ||
484 sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
485 sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
486 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
487 else if (sdata->vif.type == NL80211_IFTYPE_STATION)
488 memcpy(mgmt->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN);
489 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
490 memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN);
492 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
493 IEEE80211_STYPE_ACTION);
495 skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
497 mgmt->u.action.category = WLAN_CATEGORY_BACK;
498 mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
499 params = (u16)(initiator << 11); /* bit 11 initiator */
500 params |= (u16)(tid << 12); /* bit 15:12 TID number */
502 mgmt->u.action.u.delba.params = cpu_to_le16(params);
503 mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
505 ieee80211_tx_skb(sdata, skb);
508 void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
509 struct sta_info *sta,
510 struct ieee80211_mgmt *mgmt, size_t len)
515 params = le16_to_cpu(mgmt->u.action.u.delba.params);
516 tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
517 initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
519 ht_dbg_ratelimited(sdata, "delba from %pM (%s) tid %d reason code %d\n",
520 mgmt->sa, initiator ? "initiator" : "recipient",
522 le16_to_cpu(mgmt->u.action.u.delba.reason_code));
524 if (initiator == WLAN_BACK_INITIATOR)
525 __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0,
528 __ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_PEER_REQUEST);
531 enum nl80211_smps_mode
532 ieee80211_smps_mode_to_smps_mode(enum ieee80211_smps_mode smps)
535 case IEEE80211_SMPS_OFF:
536 return NL80211_SMPS_OFF;
537 case IEEE80211_SMPS_STATIC:
538 return NL80211_SMPS_STATIC;
539 case IEEE80211_SMPS_DYNAMIC:
540 return NL80211_SMPS_DYNAMIC;
542 return NL80211_SMPS_OFF;
546 int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata,
547 enum ieee80211_smps_mode smps, const u8 *da,
550 struct ieee80211_local *local = sdata->local;
552 struct ieee80211_mgmt *action_frame;
554 /* 27 = header + category + action + smps mode */
555 skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom);
559 skb_reserve(skb, local->hw.extra_tx_headroom);
560 action_frame = skb_put(skb, 27);
561 memcpy(action_frame->da, da, ETH_ALEN);
562 memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN);
563 memcpy(action_frame->bssid, bssid, ETH_ALEN);
564 action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
565 IEEE80211_STYPE_ACTION);
566 action_frame->u.action.category = WLAN_CATEGORY_HT;
567 action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS;
569 case IEEE80211_SMPS_AUTOMATIC:
570 case IEEE80211_SMPS_NUM_MODES:
573 case IEEE80211_SMPS_OFF:
574 action_frame->u.action.u.ht_smps.smps_control =
575 WLAN_HT_SMPS_CONTROL_DISABLED;
577 case IEEE80211_SMPS_STATIC:
578 action_frame->u.action.u.ht_smps.smps_control =
579 WLAN_HT_SMPS_CONTROL_STATIC;
581 case IEEE80211_SMPS_DYNAMIC:
582 action_frame->u.action.u.ht_smps.smps_control =
583 WLAN_HT_SMPS_CONTROL_DYNAMIC;
587 /* we'll do more on status of this frame */
588 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
589 ieee80211_tx_skb(sdata, skb);
594 void ieee80211_request_smps(struct ieee80211_vif *vif, unsigned int link_id,
595 enum ieee80211_smps_mode smps_mode)
597 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
598 struct ieee80211_link_data *link;
600 if (WARN_ON_ONCE(vif->type != NL80211_IFTYPE_STATION))
604 link = rcu_dereference(sdata->link[link_id]);
608 if (link->u.mgd.driver_smps_mode == smps_mode)
611 link->u.mgd.driver_smps_mode = smps_mode;
612 ieee80211_queue_work(&sdata->local->hw, &link->u.mgd.request_smps_work);
616 /* this might change ... don't want non-open drivers using it */
617 EXPORT_SYMBOL_GPL(ieee80211_request_smps);