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0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Copyright 2012-2013, Marco Porsch <marco.porsch@s2005.tu-chemnitz.de>
0004  * Copyright 2012-2013, cozybit Inc.
0005  * Copyright (C) 2021 Intel Corporation
0006  */
0007 
0008 #include "mesh.h"
0009 #include "wme.h"
0010 
0011 
0012 /* mesh PS management */
0013 
0014 /**
0015  * mps_qos_null_get - create pre-addressed QoS Null frame for mesh powersave
0016  * @sta: the station to get the frame for
0017  */
0018 static struct sk_buff *mps_qos_null_get(struct sta_info *sta)
0019 {
0020     struct ieee80211_sub_if_data *sdata = sta->sdata;
0021     struct ieee80211_local *local = sdata->local;
0022     struct ieee80211_hdr *nullfunc; /* use 4addr header */
0023     struct sk_buff *skb;
0024     int size = sizeof(*nullfunc);
0025     __le16 fc;
0026 
0027     skb = dev_alloc_skb(local->hw.extra_tx_headroom + size + 2);
0028     if (!skb)
0029         return NULL;
0030     skb_reserve(skb, local->hw.extra_tx_headroom);
0031 
0032     nullfunc = skb_put(skb, size);
0033     fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_QOS_NULLFUNC);
0034     ieee80211_fill_mesh_addresses(nullfunc, &fc, sta->sta.addr,
0035                       sdata->vif.addr);
0036     nullfunc->frame_control = fc;
0037     nullfunc->duration_id = 0;
0038     nullfunc->seq_ctrl = 0;
0039     /* no address resolution for this frame -> set addr 1 immediately */
0040     memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN);
0041     skb_put_zero(skb, 2); /* append QoS control field */
0042     ieee80211_mps_set_frame_flags(sdata, sta, nullfunc);
0043 
0044     return skb;
0045 }
0046 
0047 /**
0048  * mps_qos_null_tx - send a QoS Null to indicate link-specific power mode
0049  * @sta: the station to send to
0050  */
0051 static void mps_qos_null_tx(struct sta_info *sta)
0052 {
0053     struct sk_buff *skb;
0054 
0055     skb = mps_qos_null_get(sta);
0056     if (!skb)
0057         return;
0058 
0059     mps_dbg(sta->sdata, "announcing peer-specific power mode to %pM\n",
0060         sta->sta.addr);
0061 
0062     /* don't unintentionally start a MPSP */
0063     if (!test_sta_flag(sta, WLAN_STA_PS_STA)) {
0064         u8 *qc = ieee80211_get_qos_ctl((void *) skb->data);
0065 
0066         qc[0] |= IEEE80211_QOS_CTL_EOSP;
0067     }
0068 
0069     ieee80211_tx_skb(sta->sdata, skb);
0070 }
0071 
0072 /**
0073  * ieee80211_mps_local_status_update - track status of local link-specific PMs
0074  *
0075  * @sdata: local mesh subif
0076  *
0077  * sets the non-peer power mode and triggers the driver PS (re-)configuration
0078  * Return BSS_CHANGED_BEACON if a beacon update is necessary.
0079  */
0080 u32 ieee80211_mps_local_status_update(struct ieee80211_sub_if_data *sdata)
0081 {
0082     struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
0083     struct sta_info *sta;
0084     bool peering = false;
0085     int light_sleep_cnt = 0;
0086     int deep_sleep_cnt = 0;
0087     u32 changed = 0;
0088     enum nl80211_mesh_power_mode nonpeer_pm;
0089 
0090     rcu_read_lock();
0091     list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
0092         if (sdata != sta->sdata)
0093             continue;
0094 
0095         switch (sta->mesh->plink_state) {
0096         case NL80211_PLINK_OPN_SNT:
0097         case NL80211_PLINK_OPN_RCVD:
0098         case NL80211_PLINK_CNF_RCVD:
0099             peering = true;
0100             break;
0101         case NL80211_PLINK_ESTAB:
0102             if (sta->mesh->local_pm == NL80211_MESH_POWER_LIGHT_SLEEP)
0103                 light_sleep_cnt++;
0104             else if (sta->mesh->local_pm == NL80211_MESH_POWER_DEEP_SLEEP)
0105                 deep_sleep_cnt++;
0106             break;
0107         default:
0108             break;
0109         }
0110     }
0111     rcu_read_unlock();
0112 
0113     /*
0114      * Set non-peer mode to active during peering/scanning/authentication
0115      * (see IEEE802.11-2012 13.14.8.3). The non-peer mesh power mode is
0116      * deep sleep if the local STA is in light or deep sleep towards at
0117      * least one mesh peer (see 13.14.3.1). Otherwise, set it to the
0118      * user-configured default value.
0119      */
0120     if (peering) {
0121         mps_dbg(sdata, "setting non-peer PM to active for peering\n");
0122         nonpeer_pm = NL80211_MESH_POWER_ACTIVE;
0123     } else if (light_sleep_cnt || deep_sleep_cnt) {
0124         mps_dbg(sdata, "setting non-peer PM to deep sleep\n");
0125         nonpeer_pm = NL80211_MESH_POWER_DEEP_SLEEP;
0126     } else {
0127         mps_dbg(sdata, "setting non-peer PM to user value\n");
0128         nonpeer_pm = ifmsh->mshcfg.power_mode;
0129     }
0130 
0131     /* need update if sleep counts move between 0 and non-zero */
0132     if (ifmsh->nonpeer_pm != nonpeer_pm ||
0133         !ifmsh->ps_peers_light_sleep != !light_sleep_cnt ||
0134         !ifmsh->ps_peers_deep_sleep != !deep_sleep_cnt)
0135         changed = BSS_CHANGED_BEACON;
0136 
0137     ifmsh->nonpeer_pm = nonpeer_pm;
0138     ifmsh->ps_peers_light_sleep = light_sleep_cnt;
0139     ifmsh->ps_peers_deep_sleep = deep_sleep_cnt;
0140 
0141     return changed;
0142 }
0143 
0144 /**
0145  * ieee80211_mps_set_sta_local_pm - set local PM towards a mesh STA
0146  *
0147  * @sta: mesh STA
0148  * @pm: the power mode to set
0149  * Return BSS_CHANGED_BEACON if a beacon update is in order.
0150  */
0151 u32 ieee80211_mps_set_sta_local_pm(struct sta_info *sta,
0152                    enum nl80211_mesh_power_mode pm)
0153 {
0154     struct ieee80211_sub_if_data *sdata = sta->sdata;
0155 
0156     if (sta->mesh->local_pm == pm)
0157         return 0;
0158 
0159     mps_dbg(sdata, "local STA operates in mode %d with %pM\n",
0160         pm, sta->sta.addr);
0161 
0162     sta->mesh->local_pm = pm;
0163 
0164     /*
0165      * announce peer-specific power mode transition
0166      * (see IEEE802.11-2012 13.14.3.2 and 13.14.3.3)
0167      */
0168     if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
0169         mps_qos_null_tx(sta);
0170 
0171     return ieee80211_mps_local_status_update(sdata);
0172 }
0173 
0174 /**
0175  * ieee80211_mps_set_frame_flags - set mesh PS flags in FC (and QoS Control)
0176  *
0177  * @sdata: local mesh subif
0178  * @sta: mesh STA
0179  * @hdr: 802.11 frame header
0180  *
0181  * see IEEE802.11-2012 8.2.4.1.7 and 8.2.4.5.11
0182  *
0183  * NOTE: sta must be given when an individually-addressed QoS frame header
0184  * is handled, for group-addressed and management frames it is not used
0185  */
0186 void ieee80211_mps_set_frame_flags(struct ieee80211_sub_if_data *sdata,
0187                    struct sta_info *sta,
0188                    struct ieee80211_hdr *hdr)
0189 {
0190     enum nl80211_mesh_power_mode pm;
0191     u8 *qc;
0192 
0193     if (WARN_ON(is_unicast_ether_addr(hdr->addr1) &&
0194             ieee80211_is_data_qos(hdr->frame_control) &&
0195             !sta))
0196         return;
0197 
0198     if (is_unicast_ether_addr(hdr->addr1) &&
0199         ieee80211_is_data_qos(hdr->frame_control) &&
0200         sta->mesh->plink_state == NL80211_PLINK_ESTAB)
0201         pm = sta->mesh->local_pm;
0202     else
0203         pm = sdata->u.mesh.nonpeer_pm;
0204 
0205     if (pm == NL80211_MESH_POWER_ACTIVE)
0206         hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_PM);
0207     else
0208         hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
0209 
0210     if (!ieee80211_is_data_qos(hdr->frame_control))
0211         return;
0212 
0213     qc = ieee80211_get_qos_ctl(hdr);
0214 
0215     if ((is_unicast_ether_addr(hdr->addr1) &&
0216          pm == NL80211_MESH_POWER_DEEP_SLEEP) ||
0217         (is_multicast_ether_addr(hdr->addr1) &&
0218          sdata->u.mesh.ps_peers_deep_sleep > 0))
0219         qc[1] |= (IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8);
0220     else
0221         qc[1] &= ~(IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8);
0222 }
0223 
0224 /**
0225  * ieee80211_mps_sta_status_update - update buffering status of neighbor STA
0226  *
0227  * @sta: mesh STA
0228  *
0229  * called after change of peering status or non-peer/peer-specific power mode
0230  */
0231 void ieee80211_mps_sta_status_update(struct sta_info *sta)
0232 {
0233     enum nl80211_mesh_power_mode pm;
0234     bool do_buffer;
0235 
0236     /* For non-assoc STA, prevent buffering or frame transmission */
0237     if (sta->sta_state < IEEE80211_STA_ASSOC)
0238         return;
0239 
0240     /*
0241      * use peer-specific power mode if peering is established and the
0242      * peer's power mode is known
0243      */
0244     if (sta->mesh->plink_state == NL80211_PLINK_ESTAB &&
0245         sta->mesh->peer_pm != NL80211_MESH_POWER_UNKNOWN)
0246         pm = sta->mesh->peer_pm;
0247     else
0248         pm = sta->mesh->nonpeer_pm;
0249 
0250     do_buffer = (pm != NL80211_MESH_POWER_ACTIVE);
0251 
0252     /* clear the MPSP flags for non-peers or active STA */
0253     if (sta->mesh->plink_state != NL80211_PLINK_ESTAB) {
0254         clear_sta_flag(sta, WLAN_STA_MPSP_OWNER);
0255         clear_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);
0256     } else if (!do_buffer) {
0257         clear_sta_flag(sta, WLAN_STA_MPSP_OWNER);
0258     }
0259 
0260     /* Don't let the same PS state be set twice */
0261     if (test_sta_flag(sta, WLAN_STA_PS_STA) == do_buffer)
0262         return;
0263 
0264     if (do_buffer) {
0265         set_sta_flag(sta, WLAN_STA_PS_STA);
0266         atomic_inc(&sta->sdata->u.mesh.ps.num_sta_ps);
0267         mps_dbg(sta->sdata, "start PS buffering frames towards %pM\n",
0268             sta->sta.addr);
0269     } else {
0270         ieee80211_sta_ps_deliver_wakeup(sta);
0271     }
0272 }
0273 
0274 static void mps_set_sta_peer_pm(struct sta_info *sta,
0275                 struct ieee80211_hdr *hdr)
0276 {
0277     enum nl80211_mesh_power_mode pm;
0278     u8 *qc = ieee80211_get_qos_ctl(hdr);
0279 
0280     /*
0281      * Test Power Management field of frame control (PW) and
0282      * mesh power save level subfield of QoS control field (PSL)
0283      *
0284      * | PM | PSL| Mesh PM |
0285      * +----+----+---------+
0286      * | 0  |Rsrv|  Active |
0287      * | 1  | 0  |  Light  |
0288      * | 1  | 1  |  Deep   |
0289      */
0290     if (ieee80211_has_pm(hdr->frame_control)) {
0291         if (qc[1] & (IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8))
0292             pm = NL80211_MESH_POWER_DEEP_SLEEP;
0293         else
0294             pm = NL80211_MESH_POWER_LIGHT_SLEEP;
0295     } else {
0296         pm = NL80211_MESH_POWER_ACTIVE;
0297     }
0298 
0299     if (sta->mesh->peer_pm == pm)
0300         return;
0301 
0302     mps_dbg(sta->sdata, "STA %pM enters mode %d\n",
0303         sta->sta.addr, pm);
0304 
0305     sta->mesh->peer_pm = pm;
0306 
0307     ieee80211_mps_sta_status_update(sta);
0308 }
0309 
0310 static void mps_set_sta_nonpeer_pm(struct sta_info *sta,
0311                    struct ieee80211_hdr *hdr)
0312 {
0313     enum nl80211_mesh_power_mode pm;
0314 
0315     if (ieee80211_has_pm(hdr->frame_control))
0316         pm = NL80211_MESH_POWER_DEEP_SLEEP;
0317     else
0318         pm = NL80211_MESH_POWER_ACTIVE;
0319 
0320     if (sta->mesh->nonpeer_pm == pm)
0321         return;
0322 
0323     mps_dbg(sta->sdata, "STA %pM sets non-peer mode to %d\n",
0324         sta->sta.addr, pm);
0325 
0326     sta->mesh->nonpeer_pm = pm;
0327 
0328     ieee80211_mps_sta_status_update(sta);
0329 }
0330 
0331 /**
0332  * ieee80211_mps_rx_h_sta_process - frame receive handler for mesh powersave
0333  *
0334  * @sta: STA info that transmitted the frame
0335  * @hdr: IEEE 802.11 (QoS) Header
0336  */
0337 void ieee80211_mps_rx_h_sta_process(struct sta_info *sta,
0338                     struct ieee80211_hdr *hdr)
0339 {
0340     if (is_unicast_ether_addr(hdr->addr1) &&
0341         ieee80211_is_data_qos(hdr->frame_control)) {
0342         /*
0343          * individually addressed QoS Data/Null frames contain
0344          * peer link-specific PS mode towards the local STA
0345          */
0346         mps_set_sta_peer_pm(sta, hdr);
0347 
0348         /* check for mesh Peer Service Period trigger frames */
0349         ieee80211_mpsp_trigger_process(ieee80211_get_qos_ctl(hdr),
0350                            sta, false, false);
0351     } else {
0352         /*
0353          * can only determine non-peer PS mode
0354          * (see IEEE802.11-2012 8.2.4.1.7)
0355          */
0356         mps_set_sta_nonpeer_pm(sta, hdr);
0357     }
0358 }
0359 
0360 
0361 /* mesh PS frame release */
0362 
0363 static void mpsp_trigger_send(struct sta_info *sta, bool rspi, bool eosp)
0364 {
0365     struct ieee80211_sub_if_data *sdata = sta->sdata;
0366     struct sk_buff *skb;
0367     struct ieee80211_hdr *nullfunc;
0368     struct ieee80211_tx_info *info;
0369     u8 *qc;
0370 
0371     skb = mps_qos_null_get(sta);
0372     if (!skb)
0373         return;
0374 
0375     nullfunc = (struct ieee80211_hdr *) skb->data;
0376     if (!eosp)
0377         nullfunc->frame_control |=
0378                 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
0379     /*
0380      * | RSPI | EOSP |  MPSP triggering   |
0381      * +------+------+--------------------+
0382      * |  0   |  0   | local STA is owner |
0383      * |  0   |  1   | no MPSP (MPSP end) |
0384      * |  1   |  0   | both STA are owner |
0385      * |  1   |  1   | peer STA is owner  | see IEEE802.11-2012 13.14.9.2
0386      */
0387     qc = ieee80211_get_qos_ctl(nullfunc);
0388     if (rspi)
0389         qc[1] |= (IEEE80211_QOS_CTL_RSPI >> 8);
0390     if (eosp)
0391         qc[0] |= IEEE80211_QOS_CTL_EOSP;
0392 
0393     info = IEEE80211_SKB_CB(skb);
0394 
0395     info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
0396                IEEE80211_TX_CTL_REQ_TX_STATUS;
0397 
0398     mps_dbg(sdata, "sending MPSP trigger%s%s to %pM\n",
0399         rspi ? " RSPI" : "", eosp ? " EOSP" : "", sta->sta.addr);
0400 
0401     ieee80211_tx_skb(sdata, skb);
0402 }
0403 
0404 /**
0405  * mpsp_qos_null_append - append QoS Null frame to MPSP skb queue if needed
0406  * @sta: the station to handle
0407  * @frames: the frame list to append to
0408  *
0409  * To properly end a mesh MPSP the last transmitted frame has to set the EOSP
0410  * flag in the QoS Control field. In case the current tailing frame is not a
0411  * QoS Data frame, append a QoS Null to carry the flag.
0412  */
0413 static void mpsp_qos_null_append(struct sta_info *sta,
0414                  struct sk_buff_head *frames)
0415 {
0416     struct ieee80211_sub_if_data *sdata = sta->sdata;
0417     struct sk_buff *new_skb, *skb = skb_peek_tail(frames);
0418     struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
0419     struct ieee80211_tx_info *info;
0420 
0421     if (ieee80211_is_data_qos(hdr->frame_control))
0422         return;
0423 
0424     new_skb = mps_qos_null_get(sta);
0425     if (!new_skb)
0426         return;
0427 
0428     mps_dbg(sdata, "appending QoS Null in MPSP towards %pM\n",
0429         sta->sta.addr);
0430     /*
0431      * This frame has to be transmitted last. Assign lowest priority to
0432      * make sure it cannot pass other frames when releasing multiple ACs.
0433      */
0434     new_skb->priority = 1;
0435     skb_set_queue_mapping(new_skb, IEEE80211_AC_BK);
0436     ieee80211_set_qos_hdr(sdata, new_skb);
0437 
0438     info = IEEE80211_SKB_CB(new_skb);
0439     info->control.vif = &sdata->vif;
0440     info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
0441 
0442     __skb_queue_tail(frames, new_skb);
0443 }
0444 
0445 /**
0446  * mps_frame_deliver - transmit frames during mesh powersave
0447  *
0448  * @sta: STA info to transmit to
0449  * @n_frames: number of frames to transmit. -1 for all
0450  */
0451 static void mps_frame_deliver(struct sta_info *sta, int n_frames)
0452 {
0453     struct ieee80211_local *local = sta->sdata->local;
0454     int ac;
0455     struct sk_buff_head frames;
0456     struct sk_buff *skb;
0457     bool more_data = false;
0458 
0459     skb_queue_head_init(&frames);
0460 
0461     /* collect frame(s) from buffers */
0462     for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
0463         while (n_frames != 0) {
0464             skb = skb_dequeue(&sta->tx_filtered[ac]);
0465             if (!skb) {
0466                 skb = skb_dequeue(
0467                     &sta->ps_tx_buf[ac]);
0468                 if (skb)
0469                     local->total_ps_buffered--;
0470             }
0471             if (!skb)
0472                 break;
0473             n_frames--;
0474             __skb_queue_tail(&frames, skb);
0475         }
0476 
0477         if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
0478             !skb_queue_empty(&sta->ps_tx_buf[ac]))
0479             more_data = true;
0480     }
0481 
0482     /* nothing to send? -> EOSP */
0483     if (skb_queue_empty(&frames)) {
0484         mpsp_trigger_send(sta, false, true);
0485         return;
0486     }
0487 
0488     /* in a MPSP make sure the last skb is a QoS Data frame */
0489     if (test_sta_flag(sta, WLAN_STA_MPSP_OWNER))
0490         mpsp_qos_null_append(sta, &frames);
0491 
0492     mps_dbg(sta->sdata, "sending %d frames to PS STA %pM\n",
0493         skb_queue_len(&frames), sta->sta.addr);
0494 
0495     /* prepare collected frames for transmission */
0496     skb_queue_walk(&frames, skb) {
0497         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
0498         struct ieee80211_hdr *hdr = (void *) skb->data;
0499 
0500         /*
0501          * Tell TX path to send this frame even though the
0502          * STA may still remain is PS mode after this frame
0503          * exchange.
0504          */
0505         info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
0506 
0507         if (more_data || !skb_queue_is_last(&frames, skb))
0508             hdr->frame_control |=
0509                 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
0510         else
0511             hdr->frame_control &=
0512                 cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
0513 
0514         if (skb_queue_is_last(&frames, skb) &&
0515             ieee80211_is_data_qos(hdr->frame_control)) {
0516             u8 *qoshdr = ieee80211_get_qos_ctl(hdr);
0517 
0518             /* MPSP trigger frame ends service period */
0519             *qoshdr |= IEEE80211_QOS_CTL_EOSP;
0520             info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
0521         }
0522     }
0523 
0524     ieee80211_add_pending_skbs(local, &frames);
0525     sta_info_recalc_tim(sta);
0526 }
0527 
0528 /**
0529  * ieee80211_mpsp_trigger_process - track status of mesh Peer Service Periods
0530  *
0531  * @qc: QoS Control field
0532  * @sta: peer to start a MPSP with
0533  * @tx: frame was transmitted by the local STA
0534  * @acked: frame has been transmitted successfully
0535  *
0536  * NOTE: active mode STA may only serve as MPSP owner
0537  */
0538 void ieee80211_mpsp_trigger_process(u8 *qc, struct sta_info *sta,
0539                     bool tx, bool acked)
0540 {
0541     u8 rspi = qc[1] & (IEEE80211_QOS_CTL_RSPI >> 8);
0542     u8 eosp = qc[0] & IEEE80211_QOS_CTL_EOSP;
0543 
0544     if (tx) {
0545         if (rspi && acked)
0546             set_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);
0547 
0548         if (eosp)
0549             clear_sta_flag(sta, WLAN_STA_MPSP_OWNER);
0550         else if (acked &&
0551              test_sta_flag(sta, WLAN_STA_PS_STA) &&
0552              !test_and_set_sta_flag(sta, WLAN_STA_MPSP_OWNER))
0553             mps_frame_deliver(sta, -1);
0554     } else {
0555         if (eosp)
0556             clear_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);
0557         else if (sta->mesh->local_pm != NL80211_MESH_POWER_ACTIVE)
0558             set_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);
0559 
0560         if (rspi && !test_and_set_sta_flag(sta, WLAN_STA_MPSP_OWNER))
0561             mps_frame_deliver(sta, -1);
0562     }
0563 }
0564 
0565 /**
0566  * ieee80211_mps_frame_release - release frames buffered due to mesh power save
0567  *
0568  * @sta: mesh STA
0569  * @elems: IEs of beacon or probe response
0570  *
0571  * For peers if we have individually-addressed frames buffered or the peer
0572  * indicates buffered frames, send a corresponding MPSP trigger frame. Since
0573  * we do not evaluate the awake window duration, QoS Nulls are used as MPSP
0574  * trigger frames. If the neighbour STA is not a peer, only send single frames.
0575  */
0576 void ieee80211_mps_frame_release(struct sta_info *sta,
0577                  struct ieee802_11_elems *elems)
0578 {
0579     int ac, buffer_local = 0;
0580     bool has_buffered = false;
0581 
0582     if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
0583         has_buffered = ieee80211_check_tim(elems->tim, elems->tim_len,
0584                            sta->mesh->aid);
0585 
0586     if (has_buffered)
0587         mps_dbg(sta->sdata, "%pM indicates buffered frames\n",
0588             sta->sta.addr);
0589 
0590     /* only transmit to PS STA with announced, non-zero awake window */
0591     if (test_sta_flag(sta, WLAN_STA_PS_STA) &&
0592         (!elems->awake_window || !get_unaligned_le16(elems->awake_window)))
0593         return;
0594 
0595     if (!test_sta_flag(sta, WLAN_STA_MPSP_OWNER))
0596         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
0597             buffer_local += skb_queue_len(&sta->ps_tx_buf[ac]) +
0598                     skb_queue_len(&sta->tx_filtered[ac]);
0599 
0600     if (!has_buffered && !buffer_local)
0601         return;
0602 
0603     if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
0604         mpsp_trigger_send(sta, has_buffered, !buffer_local);
0605     else
0606         mps_frame_deliver(sta, 1);
0607 }
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