diff options
Diffstat (limited to 'net/mac80211/ht.c')
| -rw-r--r-- | net/mac80211/ht.c | 612 |
1 files changed, 612 insertions, 0 deletions
diff --git a/net/mac80211/ht.c b/net/mac80211/ht.c new file mode 100644 index 0000000000..b337187289 --- /dev/null +++ b/net/mac80211/ht.c @@ -0,0 +1,612 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * HT handling + * + * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> + * Copyright 2002-2005, Instant802 Networks, Inc. + * Copyright 2005-2006, Devicescape Software, Inc. + * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> + * Copyright 2007, Michael Wu <flamingice@sourmilk.net> + * Copyright 2007-2010, Intel Corporation + * Copyright 2017 Intel Deutschland GmbH + * Copyright(c) 2020-2023 Intel Corporation + */ + +#include <linux/ieee80211.h> +#include <linux/export.h> +#include <net/mac80211.h> +#include "ieee80211_i.h" +#include "rate.h" + +static void __check_htcap_disable(struct ieee80211_ht_cap *ht_capa, + struct ieee80211_ht_cap *ht_capa_mask, + struct ieee80211_sta_ht_cap *ht_cap, + u16 flag) +{ + __le16 le_flag = cpu_to_le16(flag); + if (ht_capa_mask->cap_info & le_flag) { + if (!(ht_capa->cap_info & le_flag)) + ht_cap->cap &= ~flag; + } +} + +static void __check_htcap_enable(struct ieee80211_ht_cap *ht_capa, + struct ieee80211_ht_cap *ht_capa_mask, + struct ieee80211_sta_ht_cap *ht_cap, + u16 flag) +{ + __le16 le_flag = cpu_to_le16(flag); + + if ((ht_capa_mask->cap_info & le_flag) && + (ht_capa->cap_info & le_flag)) + ht_cap->cap |= flag; +} + +void ieee80211_apply_htcap_overrides(struct ieee80211_sub_if_data *sdata, + struct ieee80211_sta_ht_cap *ht_cap) +{ + struct ieee80211_ht_cap *ht_capa, *ht_capa_mask; + u8 *scaps, *smask; + int i; + + if (!ht_cap->ht_supported) + return; + + switch (sdata->vif.type) { + case NL80211_IFTYPE_STATION: + ht_capa = &sdata->u.mgd.ht_capa; + ht_capa_mask = &sdata->u.mgd.ht_capa_mask; + break; + case NL80211_IFTYPE_ADHOC: + ht_capa = &sdata->u.ibss.ht_capa; + ht_capa_mask = &sdata->u.ibss.ht_capa_mask; + break; + default: + WARN_ON_ONCE(1); + return; + } + + scaps = (u8 *)(&ht_capa->mcs.rx_mask); + smask = (u8 *)(&ht_capa_mask->mcs.rx_mask); + + /* NOTE: If you add more over-rides here, update register_hw + * ht_capa_mod_mask logic in main.c as well. + * And, if this method can ever change ht_cap.ht_supported, fix + * the check in ieee80211_add_ht_ie. + */ + + /* check for HT over-rides, MCS rates first. */ + for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++) { + u8 m = smask[i]; + ht_cap->mcs.rx_mask[i] &= ~m; /* turn off all masked bits */ + /* Add back rates that are supported */ + ht_cap->mcs.rx_mask[i] |= (m & scaps[i]); + } + + /* Force removal of HT-40 capabilities? */ + __check_htcap_disable(ht_capa, ht_capa_mask, ht_cap, + IEEE80211_HT_CAP_SUP_WIDTH_20_40); + __check_htcap_disable(ht_capa, ht_capa_mask, ht_cap, + IEEE80211_HT_CAP_SGI_40); + + /* Allow user to disable SGI-20 (SGI-40 is handled above) */ + __check_htcap_disable(ht_capa, ht_capa_mask, ht_cap, + IEEE80211_HT_CAP_SGI_20); + + /* Allow user to disable the max-AMSDU bit. */ + __check_htcap_disable(ht_capa, ht_capa_mask, ht_cap, + IEEE80211_HT_CAP_MAX_AMSDU); + + /* Allow user to disable LDPC */ + __check_htcap_disable(ht_capa, ht_capa_mask, ht_cap, + IEEE80211_HT_CAP_LDPC_CODING); + + /* Allow user to enable 40 MHz intolerant bit. */ + __check_htcap_enable(ht_capa, ht_capa_mask, ht_cap, + IEEE80211_HT_CAP_40MHZ_INTOLERANT); + + /* Allow user to enable TX STBC bit */ + __check_htcap_enable(ht_capa, ht_capa_mask, ht_cap, + IEEE80211_HT_CAP_TX_STBC); + + /* Allow user to configure RX STBC bits */ + if (ht_capa_mask->cap_info & cpu_to_le16(IEEE80211_HT_CAP_RX_STBC)) + ht_cap->cap |= le16_to_cpu(ht_capa->cap_info) & + IEEE80211_HT_CAP_RX_STBC; + + /* Allow user to decrease AMPDU factor */ + if (ht_capa_mask->ampdu_params_info & + IEEE80211_HT_AMPDU_PARM_FACTOR) { + u8 n = ht_capa->ampdu_params_info & + IEEE80211_HT_AMPDU_PARM_FACTOR; + if (n < ht_cap->ampdu_factor) + ht_cap->ampdu_factor = n; + } + + /* Allow the user to increase AMPDU density. */ + if (ht_capa_mask->ampdu_params_info & + IEEE80211_HT_AMPDU_PARM_DENSITY) { + u8 n = (ht_capa->ampdu_params_info & + IEEE80211_HT_AMPDU_PARM_DENSITY) + >> IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT; + if (n > ht_cap->ampdu_density) + ht_cap->ampdu_density = n; + } +} + + +bool ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_sub_if_data *sdata, + struct ieee80211_supported_band *sband, + const struct ieee80211_ht_cap *ht_cap_ie, + struct link_sta_info *link_sta) +{ + struct ieee80211_bss_conf *link_conf; + struct sta_info *sta = link_sta->sta; + struct ieee80211_sta_ht_cap ht_cap, own_cap; + u8 ampdu_info, tx_mcs_set_cap; + int i, max_tx_streams; + bool changed; + enum ieee80211_sta_rx_bandwidth bw; + enum nl80211_chan_width width; + + memset(&ht_cap, 0, sizeof(ht_cap)); + + if (!ht_cap_ie || !sband->ht_cap.ht_supported) + goto apply; + + ht_cap.ht_supported = true; + + own_cap = sband->ht_cap; + + /* + * If user has specified capability over-rides, take care + * of that if the station we're setting up is the AP or TDLS peer that + * we advertised a restricted capability set to. Override + * our own capabilities and then use those below. + */ + if (sdata->vif.type == NL80211_IFTYPE_STATION || + sdata->vif.type == NL80211_IFTYPE_ADHOC) + ieee80211_apply_htcap_overrides(sdata, &own_cap); + + /* + * The bits listed in this expression should be + * the same for the peer and us, if the station + * advertises more then we can't use those thus + * we mask them out. + */ + ht_cap.cap = le16_to_cpu(ht_cap_ie->cap_info) & + (own_cap.cap | ~(IEEE80211_HT_CAP_LDPC_CODING | + IEEE80211_HT_CAP_SUP_WIDTH_20_40 | + IEEE80211_HT_CAP_GRN_FLD | + IEEE80211_HT_CAP_SGI_20 | + IEEE80211_HT_CAP_SGI_40 | + IEEE80211_HT_CAP_DSSSCCK40)); + + /* + * The STBC bits are asymmetric -- if we don't have + * TX then mask out the peer's RX and vice versa. + */ + if (!(own_cap.cap & IEEE80211_HT_CAP_TX_STBC)) + ht_cap.cap &= ~IEEE80211_HT_CAP_RX_STBC; + if (!(own_cap.cap & IEEE80211_HT_CAP_RX_STBC)) + ht_cap.cap &= ~IEEE80211_HT_CAP_TX_STBC; + + ampdu_info = ht_cap_ie->ampdu_params_info; + ht_cap.ampdu_factor = + ampdu_info & IEEE80211_HT_AMPDU_PARM_FACTOR; + ht_cap.ampdu_density = + (ampdu_info & IEEE80211_HT_AMPDU_PARM_DENSITY) >> 2; + + /* own MCS TX capabilities */ + tx_mcs_set_cap = own_cap.mcs.tx_params; + + /* Copy peer MCS TX capabilities, the driver might need them. */ + ht_cap.mcs.tx_params = ht_cap_ie->mcs.tx_params; + + /* can we TX with MCS rates? */ + if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED)) + goto apply; + + /* Counting from 0, therefore +1 */ + if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF) + max_tx_streams = + ((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK) + >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1; + else + max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS; + + /* + * 802.11n-2009 20.3.5 / 20.6 says: + * - indices 0 to 7 and 32 are single spatial stream + * - 8 to 31 are multiple spatial streams using equal modulation + * [8..15 for two streams, 16..23 for three and 24..31 for four] + * - remainder are multiple spatial streams using unequal modulation + */ + for (i = 0; i < max_tx_streams; i++) + ht_cap.mcs.rx_mask[i] = + own_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i]; + + if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION) + for (i = IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE; + i < IEEE80211_HT_MCS_MASK_LEN; i++) + ht_cap.mcs.rx_mask[i] = + own_cap.mcs.rx_mask[i] & + ht_cap_ie->mcs.rx_mask[i]; + + /* handle MCS rate 32 too */ + if (own_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1) + ht_cap.mcs.rx_mask[32/8] |= 1; + + /* set Rx highest rate */ + ht_cap.mcs.rx_highest = ht_cap_ie->mcs.rx_highest; + + if (ht_cap.cap & IEEE80211_HT_CAP_MAX_AMSDU) + link_sta->pub->agg.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_7935; + else + link_sta->pub->agg.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_3839; + + ieee80211_sta_recalc_aggregates(&sta->sta); + + apply: + changed = memcmp(&link_sta->pub->ht_cap, &ht_cap, sizeof(ht_cap)); + + memcpy(&link_sta->pub->ht_cap, &ht_cap, sizeof(ht_cap)); + + rcu_read_lock(); + link_conf = rcu_dereference(sdata->vif.link_conf[link_sta->link_id]); + if (WARN_ON(!link_conf)) + width = NL80211_CHAN_WIDTH_20_NOHT; + else + width = link_conf->chandef.width; + + switch (width) { + default: + WARN_ON_ONCE(1); + fallthrough; + case NL80211_CHAN_WIDTH_20_NOHT: + case NL80211_CHAN_WIDTH_20: + bw = IEEE80211_STA_RX_BW_20; + break; + case NL80211_CHAN_WIDTH_40: + case NL80211_CHAN_WIDTH_80: + case NL80211_CHAN_WIDTH_80P80: + case NL80211_CHAN_WIDTH_160: + case NL80211_CHAN_WIDTH_320: + bw = ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ? + IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20; + break; + } + rcu_read_unlock(); + + link_sta->pub->bandwidth = bw; + + link_sta->cur_max_bandwidth = + ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ? + IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20; + + if (sta->sdata->vif.type == NL80211_IFTYPE_AP || + sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { + enum ieee80211_smps_mode smps_mode; + + switch ((ht_cap.cap & IEEE80211_HT_CAP_SM_PS) + >> IEEE80211_HT_CAP_SM_PS_SHIFT) { + case WLAN_HT_CAP_SM_PS_INVALID: + case WLAN_HT_CAP_SM_PS_STATIC: + smps_mode = IEEE80211_SMPS_STATIC; + break; + case WLAN_HT_CAP_SM_PS_DYNAMIC: + smps_mode = IEEE80211_SMPS_DYNAMIC; + break; + case WLAN_HT_CAP_SM_PS_DISABLED: + smps_mode = IEEE80211_SMPS_OFF; + break; + } + + if (smps_mode != link_sta->pub->smps_mode) + changed = true; + link_sta->pub->smps_mode = smps_mode; + } else { + link_sta->pub->smps_mode = IEEE80211_SMPS_OFF; + } + + return changed; +} + +void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta, + enum ieee80211_agg_stop_reason reason) +{ + int i; + + mutex_lock(&sta->ampdu_mlme.mtx); + for (i = 0; i < IEEE80211_NUM_TIDS; i++) + ___ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT, + WLAN_REASON_QSTA_LEAVE_QBSS, + reason != AGG_STOP_DESTROY_STA && + reason != AGG_STOP_PEER_REQUEST); + + for (i = 0; i < IEEE80211_NUM_TIDS; i++) + ___ieee80211_stop_tx_ba_session(sta, i, reason); + mutex_unlock(&sta->ampdu_mlme.mtx); + + /* + * In case the tear down is part of a reconfigure due to HW restart + * request, it is possible that the low level driver requested to stop + * the BA session, so handle it to properly clean tid_tx data. + */ + if(reason == AGG_STOP_DESTROY_STA) { + cancel_work_sync(&sta->ampdu_mlme.work); + + mutex_lock(&sta->ampdu_mlme.mtx); + for (i = 0; i < IEEE80211_NUM_TIDS; i++) { + struct tid_ampdu_tx *tid_tx = + rcu_dereference_protected_tid_tx(sta, i); + + if (!tid_tx) + continue; + + if (test_and_clear_bit(HT_AGG_STATE_STOP_CB, &tid_tx->state)) + ieee80211_stop_tx_ba_cb(sta, i, tid_tx); + } + mutex_unlock(&sta->ampdu_mlme.mtx); + } +} + +void ieee80211_ba_session_work(struct work_struct *work) +{ + struct sta_info *sta = + container_of(work, struct sta_info, ampdu_mlme.work); + struct tid_ampdu_tx *tid_tx; + bool blocked; + int tid; + + /* When this flag is set, new sessions should be blocked. */ + blocked = test_sta_flag(sta, WLAN_STA_BLOCK_BA); + + mutex_lock(&sta->ampdu_mlme.mtx); + for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) { + if (test_and_clear_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired)) + ___ieee80211_stop_rx_ba_session( + sta, tid, WLAN_BACK_RECIPIENT, + WLAN_REASON_QSTA_TIMEOUT, true); + + if (test_and_clear_bit(tid, + sta->ampdu_mlme.tid_rx_stop_requested)) + ___ieee80211_stop_rx_ba_session( + sta, tid, WLAN_BACK_RECIPIENT, + WLAN_REASON_UNSPECIFIED, true); + + if (!blocked && + test_and_clear_bit(tid, + sta->ampdu_mlme.tid_rx_manage_offl)) + ___ieee80211_start_rx_ba_session(sta, 0, 0, 0, 1, tid, + IEEE80211_MAX_AMPDU_BUF_HT, + false, true, NULL); + + if (test_and_clear_bit(tid + IEEE80211_NUM_TIDS, + sta->ampdu_mlme.tid_rx_manage_offl)) + ___ieee80211_stop_rx_ba_session( + sta, tid, WLAN_BACK_RECIPIENT, + 0, false); + + spin_lock_bh(&sta->lock); + + tid_tx = sta->ampdu_mlme.tid_start_tx[tid]; + if (!blocked && tid_tx) { + struct txq_info *txqi = to_txq_info(sta->sta.txq[tid]); + struct ieee80211_sub_if_data *sdata = + vif_to_sdata(txqi->txq.vif); + struct fq *fq = &sdata->local->fq; + + spin_lock_bh(&fq->lock); + + /* Allow only frags to be dequeued */ + set_bit(IEEE80211_TXQ_STOP, &txqi->flags); + + if (!skb_queue_empty(&txqi->frags)) { + /* Fragmented Tx is ongoing, wait for it to + * finish. Reschedule worker to retry later. + */ + + spin_unlock_bh(&fq->lock); + spin_unlock_bh(&sta->lock); + + /* Give the task working on the txq a chance + * to send out the queued frags + */ + synchronize_net(); + + mutex_unlock(&sta->ampdu_mlme.mtx); + + ieee80211_queue_work(&sdata->local->hw, work); + return; + } + + spin_unlock_bh(&fq->lock); + + /* + * Assign it over to the normal tid_tx array + * where it "goes live". + */ + + sta->ampdu_mlme.tid_start_tx[tid] = NULL; + /* could there be a race? */ + if (sta->ampdu_mlme.tid_tx[tid]) + kfree(tid_tx); + else + ieee80211_assign_tid_tx(sta, tid, tid_tx); + spin_unlock_bh(&sta->lock); + + ieee80211_tx_ba_session_handle_start(sta, tid); + continue; + } + spin_unlock_bh(&sta->lock); + + tid_tx = rcu_dereference_protected_tid_tx(sta, tid); + if (!tid_tx) + continue; + + if (!blocked && + test_and_clear_bit(HT_AGG_STATE_START_CB, &tid_tx->state)) + ieee80211_start_tx_ba_cb(sta, tid, tid_tx); + if (test_and_clear_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state)) + ___ieee80211_stop_tx_ba_session(sta, tid, + AGG_STOP_LOCAL_REQUEST); + if (test_and_clear_bit(HT_AGG_STATE_STOP_CB, &tid_tx->state)) + ieee80211_stop_tx_ba_cb(sta, tid, tid_tx); + } + mutex_unlock(&sta->ampdu_mlme.mtx); +} + +void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata, + const u8 *da, u16 tid, + u16 initiator, u16 reason_code) +{ + struct ieee80211_local *local = sdata->local; + struct sk_buff *skb; + struct ieee80211_mgmt *mgmt; + u16 params; + + skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); + if (!skb) + return; + + skb_reserve(skb, local->hw.extra_tx_headroom); + mgmt = skb_put_zero(skb, 24); + memcpy(mgmt->da, da, ETH_ALEN); + memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); + if (sdata->vif.type == NL80211_IFTYPE_AP || + sdata->vif.type == NL80211_IFTYPE_AP_VLAN || + sdata->vif.type == NL80211_IFTYPE_MESH_POINT) + memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); + else if (sdata->vif.type == NL80211_IFTYPE_STATION) + memcpy(mgmt->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN); + else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) + memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN); + + mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | + IEEE80211_STYPE_ACTION); + + skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba)); + + mgmt->u.action.category = WLAN_CATEGORY_BACK; + mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA; + params = (u16)(initiator << 11); /* bit 11 initiator */ + params |= (u16)(tid << 12); /* bit 15:12 TID number */ + + mgmt->u.action.u.delba.params = cpu_to_le16(params); + mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code); + + ieee80211_tx_skb(sdata, skb); +} + +void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata, + struct sta_info *sta, + struct ieee80211_mgmt *mgmt, size_t len) +{ + u16 tid, params; + u16 initiator; + + params = le16_to_cpu(mgmt->u.action.u.delba.params); + tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12; + initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11; + + ht_dbg_ratelimited(sdata, "delba from %pM (%s) tid %d reason code %d\n", + mgmt->sa, initiator ? "initiator" : "recipient", + tid, + le16_to_cpu(mgmt->u.action.u.delba.reason_code)); + + if (initiator == WLAN_BACK_INITIATOR) + __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0, + true); + else + __ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_PEER_REQUEST); +} + +enum nl80211_smps_mode +ieee80211_smps_mode_to_smps_mode(enum ieee80211_smps_mode smps) +{ + switch (smps) { + case IEEE80211_SMPS_OFF: + return NL80211_SMPS_OFF; + case IEEE80211_SMPS_STATIC: + return NL80211_SMPS_STATIC; + case IEEE80211_SMPS_DYNAMIC: + return NL80211_SMPS_DYNAMIC; + default: + return NL80211_SMPS_OFF; + } +} + +int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata, + enum ieee80211_smps_mode smps, const u8 *da, + const u8 *bssid) +{ + struct ieee80211_local *local = sdata->local; + struct sk_buff *skb; + struct ieee80211_mgmt *action_frame; + + /* 27 = header + category + action + smps mode */ + skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom); + if (!skb) + return -ENOMEM; + + skb_reserve(skb, local->hw.extra_tx_headroom); + action_frame = skb_put(skb, 27); + memcpy(action_frame->da, da, ETH_ALEN); + memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN); + memcpy(action_frame->bssid, bssid, ETH_ALEN); + action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | + IEEE80211_STYPE_ACTION); + action_frame->u.action.category = WLAN_CATEGORY_HT; + action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS; + switch (smps) { + case IEEE80211_SMPS_AUTOMATIC: + case IEEE80211_SMPS_NUM_MODES: + WARN_ON(1); + fallthrough; + case IEEE80211_SMPS_OFF: + action_frame->u.action.u.ht_smps.smps_control = + WLAN_HT_SMPS_CONTROL_DISABLED; + break; + case IEEE80211_SMPS_STATIC: + action_frame->u.action.u.ht_smps.smps_control = + WLAN_HT_SMPS_CONTROL_STATIC; + break; + case IEEE80211_SMPS_DYNAMIC: + action_frame->u.action.u.ht_smps.smps_control = + WLAN_HT_SMPS_CONTROL_DYNAMIC; + break; + } + + /* we'll do more on status of this frame */ + IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; + ieee80211_tx_skb(sdata, skb); + + return 0; +} + +void ieee80211_request_smps(struct ieee80211_vif *vif, unsigned int link_id, + enum ieee80211_smps_mode smps_mode) +{ + struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); + struct ieee80211_link_data *link; + + if (WARN_ON_ONCE(vif->type != NL80211_IFTYPE_STATION)) + return; + + rcu_read_lock(); + link = rcu_dereference(sdata->link[link_id]); + if (WARN_ON(!link)) + goto out; + + if (link->u.mgd.driver_smps_mode == smps_mode) + goto out; + + link->u.mgd.driver_smps_mode = smps_mode; + wiphy_work_queue(sdata->local->hw.wiphy, + &link->u.mgd.request_smps_work); +out: + rcu_read_unlock(); +} +/* this might change ... don't want non-open drivers using it */ +EXPORT_SYMBOL_GPL(ieee80211_request_smps); |