Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright 2012-2013, Marco Porsch <marco.porsch@s2005.tu-chemnitz.de>
 * Copyright 2012-2013, cozybit Inc.
 * Copyright (C) 2021 Intel Corporation
 */
 
#include "mesh.h"
#include "wme.h"
 
 
/* mesh PS management */
 
/**
 * mps_qos_null_get - create pre-addressed QoS Null frame for mesh powersave
 * @sta: the station to get the frame for
 */
static struct sk_buff *mps_qos_null_get(struct sta_info *sta)
{
<------>struct ieee80211_sub_if_data *sdata = sta->sdata;
<------>struct ieee80211_local *local = sdata->local;
<------>struct ieee80211_hdr *nullfunc; /* use 4addr header */
<------>struct sk_buff *skb;
<------>int size = sizeof(*nullfunc);
<------>__le16 fc;
 
<------>skb = dev_alloc_skb(local->hw.extra_tx_headroom + size + 2);
<------>if (!skb)
<------><------>return NULL;
<------>skb_reserve(skb, local->hw.extra_tx_headroom);
 
<------>nullfunc = skb_put(skb, size);
<------>fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_QOS_NULLFUNC);
<------>ieee80211_fill_mesh_addresses(nullfunc, &fc, sta->sta.addr,
<------><------><------><------>      sdata->vif.addr);
<------>nullfunc->frame_control = fc;
<------>nullfunc->duration_id = 0;
<------>nullfunc->seq_ctrl = 0;
<------>/* no address resolution for this frame -> set addr 1 immediately */
<------>memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN);
<------>skb_put_zero(skb, 2); /* append QoS control field */
<------>ieee80211_mps_set_frame_flags(sdata, sta, nullfunc);
 
<------>return skb;
}
 
/**
 * mps_qos_null_tx - send a QoS Null to indicate link-specific power mode
 * @sta: the station to send to
 */
static void mps_qos_null_tx(struct sta_info *sta)
{
<------>struct sk_buff *skb;
 
<------>skb = mps_qos_null_get(sta);
<------>if (!skb)
<------><------>return;
 
<------>mps_dbg(sta->sdata, "announcing peer-specific power mode to %pM\n",
<------><------>sta->sta.addr);
 
<------>/* don't unintentionally start a MPSP */
<------>if (!test_sta_flag(sta, WLAN_STA_PS_STA)) {
<------><------>u8 *qc = ieee80211_get_qos_ctl((void *) skb->data);
 
<------><------>qc[0] |= IEEE80211_QOS_CTL_EOSP;
<------>}
 
<------>ieee80211_tx_skb(sta->sdata, skb);
}
 
/**
 * ieee80211_mps_local_status_update - track status of local link-specific PMs
 *
 * @sdata: local mesh subif
 *
 * sets the non-peer power mode and triggers the driver PS (re-)configuration
 * Return BSS_CHANGED_BEACON if a beacon update is necessary.
 */
u32 ieee80211_mps_local_status_update(struct ieee80211_sub_if_data *sdata)
{
<------>struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
<------>struct sta_info *sta;
<------>bool peering = false;
<------>int light_sleep_cnt = 0;
<------>int deep_sleep_cnt = 0;
<------>u32 changed = 0;
<------>enum nl80211_mesh_power_mode nonpeer_pm;
 
<------>rcu_read_lock();
<------>list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) {
<------><------>if (sdata != sta->sdata)
<------><------><------>continue;
 
<------><------>switch (sta->mesh->plink_state) {
<------><------>case NL80211_PLINK_OPN_SNT:
<------><------>case NL80211_PLINK_OPN_RCVD:
<------><------>case NL80211_PLINK_CNF_RCVD:
<------><------><------>peering = true;
<------><------><------>break;
<------><------>case NL80211_PLINK_ESTAB:
<------><------><------>if (sta->mesh->local_pm == NL80211_MESH_POWER_LIGHT_SLEEP)
<------><------><------><------>light_sleep_cnt++;
<------><------><------>else if (sta->mesh->local_pm == NL80211_MESH_POWER_DEEP_SLEEP)
<------><------><------><------>deep_sleep_cnt++;
<------><------><------>break;
<------><------>default:
<------><------><------>break;
<------><------>}
<------>}
<------>rcu_read_unlock();
 
<------>/*
<------> * Set non-peer mode to active during peering/scanning/authentication
<------> * (see IEEE802.11-2012 13.14.8.3). The non-peer mesh power mode is
<------> * deep sleep if the local STA is in light or deep sleep towards at
<------> * least one mesh peer (see 13.14.3.1). Otherwise, set it to the
<------> * user-configured default value.
<------> */
<------>if (peering) {
<------><------>mps_dbg(sdata, "setting non-peer PM to active for peering\n");
<------><------>nonpeer_pm = NL80211_MESH_POWER_ACTIVE;
<------>} else if (light_sleep_cnt || deep_sleep_cnt) {
<------><------>mps_dbg(sdata, "setting non-peer PM to deep sleep\n");
<------><------>nonpeer_pm = NL80211_MESH_POWER_DEEP_SLEEP;
<------>} else {
<------><------>mps_dbg(sdata, "setting non-peer PM to user value\n");
<------><------>nonpeer_pm = ifmsh->mshcfg.power_mode;
<------>}
 
<------>/* need update if sleep counts move between 0 and non-zero */
<------>if (ifmsh->nonpeer_pm != nonpeer_pm ||
<------>    !ifmsh->ps_peers_light_sleep != !light_sleep_cnt ||
<------>    !ifmsh->ps_peers_deep_sleep != !deep_sleep_cnt)
<------><------>changed = BSS_CHANGED_BEACON;
 
<------>ifmsh->nonpeer_pm = nonpeer_pm;
<------>ifmsh->ps_peers_light_sleep = light_sleep_cnt;
<------>ifmsh->ps_peers_deep_sleep = deep_sleep_cnt;
 
<------>return changed;
}
 
/**
 * ieee80211_mps_set_sta_local_pm - set local PM towards a mesh STA
 *
 * @sta: mesh STA
 * @pm: the power mode to set
 * Return BSS_CHANGED_BEACON if a beacon update is in order.
 */
u32 ieee80211_mps_set_sta_local_pm(struct sta_info *sta,
<------><------><------><------>   enum nl80211_mesh_power_mode pm)
{
<------>struct ieee80211_sub_if_data *sdata = sta->sdata;
 
<------>if (sta->mesh->local_pm == pm)
<------><------>return 0;
 
<------>mps_dbg(sdata, "local STA operates in mode %d with %pM\n",
<------><------>pm, sta->sta.addr);
 
<------>sta->mesh->local_pm = pm;
 
<------>/*
<------> * announce peer-specific power mode transition
<------> * (see IEEE802.11-2012 13.14.3.2 and 13.14.3.3)
<------> */
<------>if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
<------><------>mps_qos_null_tx(sta);
 
<------>return ieee80211_mps_local_status_update(sdata);
}
 
/**
 * ieee80211_mps_set_frame_flags - set mesh PS flags in FC (and QoS Control)
 *
 * @sdata: local mesh subif
 * @sta: mesh STA
 * @hdr: 802.11 frame header
 *
 * see IEEE802.11-2012 8.2.4.1.7 and 8.2.4.5.11
 *
 * NOTE: sta must be given when an individually-addressed QoS frame header
 * is handled, for group-addressed and management frames it is not used
 */
void ieee80211_mps_set_frame_flags(struct ieee80211_sub_if_data *sdata,
<------><------><------><------>   struct sta_info *sta,
<------><------><------><------>   struct ieee80211_hdr *hdr)
{
<------>enum nl80211_mesh_power_mode pm;
<------>u8 *qc;
 
<------>if (WARN_ON(is_unicast_ether_addr(hdr->addr1) &&
<------><------>    ieee80211_is_data_qos(hdr->frame_control) &&
<------><------>    !sta))
<------><------>return;
 
<------>if (is_unicast_ether_addr(hdr->addr1) &&
<------>    ieee80211_is_data_qos(hdr->frame_control) &&
<------>    sta->mesh->plink_state == NL80211_PLINK_ESTAB)
<------><------>pm = sta->mesh->local_pm;
<------>else
<------><------>pm = sdata->u.mesh.nonpeer_pm;
 
<------>if (pm == NL80211_MESH_POWER_ACTIVE)
<------><------>hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_PM);
<------>else
<------><------>hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
 
<------>if (!ieee80211_is_data_qos(hdr->frame_control))
<------><------>return;
 
<------>qc = ieee80211_get_qos_ctl(hdr);
 
<------>if ((is_unicast_ether_addr(hdr->addr1) &&
<------>     pm == NL80211_MESH_POWER_DEEP_SLEEP) ||
<------>    (is_multicast_ether_addr(hdr->addr1) &&
<------>     sdata->u.mesh.ps_peers_deep_sleep > 0))
<------><------>qc[1] |= (IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8);
<------>else
<------><------>qc[1] &= ~(IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8);
}
 
/**
 * ieee80211_mps_sta_status_update - update buffering status of neighbor STA
 *
 * @sta: mesh STA
 *
 * called after change of peering status or non-peer/peer-specific power mode
 */
void ieee80211_mps_sta_status_update(struct sta_info *sta)
{
<------>enum nl80211_mesh_power_mode pm;
<------>bool do_buffer;
 
<------>/* For non-assoc STA, prevent buffering or frame transmission */
<------>if (sta->sta_state < IEEE80211_STA_ASSOC)
<------><------>return;
 
<------>/*
<------> * use peer-specific power mode if peering is established and the
<------> * peer's power mode is known
<------> */
<------>if (sta->mesh->plink_state == NL80211_PLINK_ESTAB &&
<------>    sta->mesh->peer_pm != NL80211_MESH_POWER_UNKNOWN)
<------><------>pm = sta->mesh->peer_pm;
<------>else
<------><------>pm = sta->mesh->nonpeer_pm;
 
<------>do_buffer = (pm != NL80211_MESH_POWER_ACTIVE);
 
<------>/* clear the MPSP flags for non-peers or active STA */
<------>if (sta->mesh->plink_state != NL80211_PLINK_ESTAB) {
<------><------>clear_sta_flag(sta, WLAN_STA_MPSP_OWNER);
<------><------>clear_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);
<------>} else if (!do_buffer) {
<------><------>clear_sta_flag(sta, WLAN_STA_MPSP_OWNER);
<------>}
 
<------>/* Don't let the same PS state be set twice */
<------>if (test_sta_flag(sta, WLAN_STA_PS_STA) == do_buffer)
<------><------>return;
 
<------>if (do_buffer) {
<------><------>set_sta_flag(sta, WLAN_STA_PS_STA);
<------><------>atomic_inc(&sta->sdata->u.mesh.ps.num_sta_ps);
<------><------>mps_dbg(sta->sdata, "start PS buffering frames towards %pM\n",
<------><------><------>sta->sta.addr);
<------>} else {
<------><------>ieee80211_sta_ps_deliver_wakeup(sta);
<------>}
}
 
static void mps_set_sta_peer_pm(struct sta_info *sta,
<------><------><------><------>struct ieee80211_hdr *hdr)
{
<------>enum nl80211_mesh_power_mode pm;
<------>u8 *qc = ieee80211_get_qos_ctl(hdr);
 
<------>/*
<------> * Test Power Management field of frame control (PW) and
<------> * mesh power save level subfield of QoS control field (PSL)
<------> *
<------> * | PM | PSL| Mesh PM |
<------> * +----+----+---------+
<------> * | 0  |Rsrv|  Active |
<------> * | 1  | 0  |  Light  |
<------> * | 1  | 1  |  Deep   |
<------> */
<------>if (ieee80211_has_pm(hdr->frame_control)) {
<------><------>if (qc[1] & (IEEE80211_QOS_CTL_MESH_PS_LEVEL >> 8))
<------><------><------>pm = NL80211_MESH_POWER_DEEP_SLEEP;
<------><------>else
<------><------><------>pm = NL80211_MESH_POWER_LIGHT_SLEEP;
<------>} else {
<------><------>pm = NL80211_MESH_POWER_ACTIVE;
<------>}
 
<------>if (sta->mesh->peer_pm == pm)
<------><------>return;
 
<------>mps_dbg(sta->sdata, "STA %pM enters mode %d\n",
<------><------>sta->sta.addr, pm);
 
<------>sta->mesh->peer_pm = pm;
 
<------>ieee80211_mps_sta_status_update(sta);
}
 
static void mps_set_sta_nonpeer_pm(struct sta_info *sta,
<------><------><------><------>   struct ieee80211_hdr *hdr)
{
<------>enum nl80211_mesh_power_mode pm;
 
<------>if (ieee80211_has_pm(hdr->frame_control))
<------><------>pm = NL80211_MESH_POWER_DEEP_SLEEP;
<------>else
<------><------>pm = NL80211_MESH_POWER_ACTIVE;
 
<------>if (sta->mesh->nonpeer_pm == pm)
<------><------>return;
 
<------>mps_dbg(sta->sdata, "STA %pM sets non-peer mode to %d\n",
<------><------>sta->sta.addr, pm);
 
<------>sta->mesh->nonpeer_pm = pm;
 
<------>ieee80211_mps_sta_status_update(sta);
}
 
/**
 * ieee80211_mps_rx_h_sta_process - frame receive handler for mesh powersave
 *
 * @sta: STA info that transmitted the frame
 * @hdr: IEEE 802.11 (QoS) Header
 */
void ieee80211_mps_rx_h_sta_process(struct sta_info *sta,
<------><------><------><------>    struct ieee80211_hdr *hdr)
{
<------>if (is_unicast_ether_addr(hdr->addr1) &&
<------>    ieee80211_is_data_qos(hdr->frame_control)) {
<------><------>/*
<------><------> * individually addressed QoS Data/Null frames contain
<------><------> * peer link-specific PS mode towards the local STA
<------><------> */
<------><------>mps_set_sta_peer_pm(sta, hdr);
 
<------><------>/* check for mesh Peer Service Period trigger frames */
<------><------>ieee80211_mpsp_trigger_process(ieee80211_get_qos_ctl(hdr),
<------><------><------><------><------>       sta, false, false);
<------>} else {
<------><------>/*
<------><------> * can only determine non-peer PS mode
<------><------> * (see IEEE802.11-2012 8.2.4.1.7)
<------><------> */
<------><------>mps_set_sta_nonpeer_pm(sta, hdr);
<------>}
}
 
 
/* mesh PS frame release */
 
static void mpsp_trigger_send(struct sta_info *sta, bool rspi, bool eosp)
{
<------>struct ieee80211_sub_if_data *sdata = sta->sdata;
<------>struct sk_buff *skb;
<------>struct ieee80211_hdr *nullfunc;
<------>struct ieee80211_tx_info *info;
<------>u8 *qc;
 
<------>skb = mps_qos_null_get(sta);
<------>if (!skb)
<------><------>return;
 
<------>nullfunc = (struct ieee80211_hdr *) skb->data;
<------>if (!eosp)
<------><------>nullfunc->frame_control |=
<------><------><------><------>cpu_to_le16(IEEE80211_FCTL_MOREDATA);
<------>/*
<------> * | RSPI | EOSP |  MPSP triggering   |
<------> * +------+------+--------------------+
<------> * |  0   |  0   | local STA is owner |
<------> * |  0   |  1   | no MPSP (MPSP end) |
<------> * |  1   |  0   | both STA are owner |
<------> * |  1   |  1   | peer STA is owner  | see IEEE802.11-2012 13.14.9.2
<------> */
<------>qc = ieee80211_get_qos_ctl(nullfunc);
<------>if (rspi)
<------><------>qc[1] |= (IEEE80211_QOS_CTL_RSPI >> 8);
<------>if (eosp)
<------><------>qc[0] |= IEEE80211_QOS_CTL_EOSP;
 
<------>info = IEEE80211_SKB_CB(skb);
 
<------>info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
<------><------>       IEEE80211_TX_CTL_REQ_TX_STATUS;
 
<------>mps_dbg(sdata, "sending MPSP trigger%s%s to %pM\n",
<------><------>rspi ? " RSPI" : "", eosp ? " EOSP" : "", sta->sta.addr);
 
<------>ieee80211_tx_skb(sdata, skb);
}
 
/**
 * mpsp_qos_null_append - append QoS Null frame to MPSP skb queue if needed
 * @sta: the station to handle
 * @frames: the frame list to append to
 *
 * To properly end a mesh MPSP the last transmitted frame has to set the EOSP
 * flag in the QoS Control field. In case the current tailing frame is not a
 * QoS Data frame, append a QoS Null to carry the flag.
 */
static void mpsp_qos_null_append(struct sta_info *sta,
<------><------><------><------> struct sk_buff_head *frames)
{
<------>struct ieee80211_sub_if_data *sdata = sta->sdata;
<------>struct sk_buff *new_skb, *skb = skb_peek_tail(frames);
<------>struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
<------>struct ieee80211_tx_info *info;
 
<------>if (ieee80211_is_data_qos(hdr->frame_control))
<------><------>return;
 
<------>new_skb = mps_qos_null_get(sta);
<------>if (!new_skb)
<------><------>return;
 
<------>mps_dbg(sdata, "appending QoS Null in MPSP towards %pM\n",
<------><------>sta->sta.addr);
<------>/*
<------> * This frame has to be transmitted last. Assign lowest priority to
<------> * make sure it cannot pass other frames when releasing multiple ACs.
<------> */
<------>new_skb->priority = 1;
<------>skb_set_queue_mapping(new_skb, IEEE80211_AC_BK);
<------>ieee80211_set_qos_hdr(sdata, new_skb);
 
<------>info = IEEE80211_SKB_CB(new_skb);
<------>info->control.vif = &sdata->vif;
<------>info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
 
<------>__skb_queue_tail(frames, new_skb);
}
 
/**
 * mps_frame_deliver - transmit frames during mesh powersave
 *
 * @sta: STA info to transmit to
 * @n_frames: number of frames to transmit. -1 for all
 */
static void mps_frame_deliver(struct sta_info *sta, int n_frames)
{
<------>struct ieee80211_local *local = sta->sdata->local;
<------>int ac;
<------>struct sk_buff_head frames;
<------>struct sk_buff *skb;
<------>bool more_data = false;
 
<------>skb_queue_head_init(&frames);
 
<------>/* collect frame(s) from buffers */
<------>for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
<------><------>while (n_frames != 0) {
<------><------><------>skb = skb_dequeue(&sta->tx_filtered[ac]);
<------><------><------>if (!skb) {
<------><------><------><------>skb = skb_dequeue(
<------><------><------><------><------>&sta->ps_tx_buf[ac]);
<------><------><------><------>if (skb)
<------><------><------><------><------>local->total_ps_buffered--;
<------><------><------>}
<------><------><------>if (!skb)
<------><------><------><------>break;
<------><------><------>n_frames--;
<------><------><------>__skb_queue_tail(&frames, skb);
<------><------>}
 
<------><------>if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
<------><------>    !skb_queue_empty(&sta->ps_tx_buf[ac]))
<------><------><------>more_data = true;
<------>}
 
<------>/* nothing to send? -> EOSP */
<------>if (skb_queue_empty(&frames)) {
<------><------>mpsp_trigger_send(sta, false, true);
<------><------>return;
<------>}
 
<------>/* in a MPSP make sure the last skb is a QoS Data frame */
<------>if (test_sta_flag(sta, WLAN_STA_MPSP_OWNER))
<------><------>mpsp_qos_null_append(sta, &frames);
 
<------>mps_dbg(sta->sdata, "sending %d frames to PS STA %pM\n",
<------><------>skb_queue_len(&frames), sta->sta.addr);
 
<------>/* prepare collected frames for transmission */
<------>skb_queue_walk(&frames, skb) {
<------><------>struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
<------><------>struct ieee80211_hdr *hdr = (void *) skb->data;
 
<------><------>/*
<------><------> * Tell TX path to send this frame even though the
<------><------> * STA may still remain is PS mode after this frame
<------><------> * exchange.
<------><------> */
<------><------>info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
 
<------><------>if (more_data || !skb_queue_is_last(&frames, skb))
<------><------><------>hdr->frame_control |=
<------><------><------><------>cpu_to_le16(IEEE80211_FCTL_MOREDATA);
<------><------>else
<------><------><------>hdr->frame_control &=
<------><------><------><------>cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
 
<------><------>if (skb_queue_is_last(&frames, skb) &&
<------><------>    ieee80211_is_data_qos(hdr->frame_control)) {
<------><------><------>u8 *qoshdr = ieee80211_get_qos_ctl(hdr);
 
<------><------><------>/* MPSP trigger frame ends service period */
<------><------><------>*qoshdr |= IEEE80211_QOS_CTL_EOSP;
<------><------><------>info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
<------><------>}
<------>}
 
<------>ieee80211_add_pending_skbs(local, &frames);
<------>sta_info_recalc_tim(sta);
}
 
/**
 * ieee80211_mpsp_trigger_process - track status of mesh Peer Service Periods
 *
 * @qc: QoS Control field
 * @sta: peer to start a MPSP with
 * @tx: frame was transmitted by the local STA
 * @acked: frame has been transmitted successfully
 *
 * NOTE: active mode STA may only serve as MPSP owner
 */
void ieee80211_mpsp_trigger_process(u8 *qc, struct sta_info *sta,
<------><------><------><------>    bool tx, bool acked)
{
<------>u8 rspi = qc[1] & (IEEE80211_QOS_CTL_RSPI >> 8);
<------>u8 eosp = qc[0] & IEEE80211_QOS_CTL_EOSP;
 
<------>if (tx) {
<------><------>if (rspi && acked)
<------><------><------>set_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);
 
<------><------>if (eosp)
<------><------><------>clear_sta_flag(sta, WLAN_STA_MPSP_OWNER);
<------><------>else if (acked &&
<------><------><------> test_sta_flag(sta, WLAN_STA_PS_STA) &&
<------><------><------> !test_and_set_sta_flag(sta, WLAN_STA_MPSP_OWNER))
<------><------><------>mps_frame_deliver(sta, -1);
<------>} else {
<------><------>if (eosp)
<------><------><------>clear_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);
<------><------>else if (sta->mesh->local_pm != NL80211_MESH_POWER_ACTIVE)
<------><------><------>set_sta_flag(sta, WLAN_STA_MPSP_RECIPIENT);
 
<------><------>if (rspi && !test_and_set_sta_flag(sta, WLAN_STA_MPSP_OWNER))
<------><------><------>mps_frame_deliver(sta, -1);
<------>}
}
 
/**
 * ieee80211_mps_frame_release - release frames buffered due to mesh power save
 *
 * @sta: mesh STA
 * @elems: IEs of beacon or probe response
 *
 * For peers if we have individually-addressed frames buffered or the peer
 * indicates buffered frames, send a corresponding MPSP trigger frame. Since
 * we do not evaluate the awake window duration, QoS Nulls are used as MPSP
 * trigger frames. If the neighbour STA is not a peer, only send single frames.
 */
void ieee80211_mps_frame_release(struct sta_info *sta,
<------><------><------><------> struct ieee802_11_elems *elems)
{
<------>int ac, buffer_local = 0;
<------>bool has_buffered = false;
 
<------>if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
<------><------>has_buffered = ieee80211_check_tim(elems->tim, elems->tim_len,
<------><------><------><------><------><------>   sta->mesh->aid);
 
<------>if (has_buffered)
<------><------>mps_dbg(sta->sdata, "%pM indicates buffered frames\n",
<------><------><------>sta->sta.addr);
 
<------>/* only transmit to PS STA with announced, non-zero awake window */
<------>if (test_sta_flag(sta, WLAN_STA_PS_STA) &&
<------>    (!elems->awake_window || !get_unaligned_le16(elems->awake_window)))
<------><------>return;
 
<------>if (!test_sta_flag(sta, WLAN_STA_MPSP_OWNER))
<------><------>for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
<------><------><------>buffer_local += skb_queue_len(&sta->ps_tx_buf[ac]) +
<------><------><------><------><------>skb_queue_len(&sta->tx_filtered[ac]);
 
<------>if (!has_buffered && !buffer_local)
<------><------>return;
 
<------>if (sta->mesh->plink_state == NL80211_PLINK_ESTAB)
<------><------>mpsp_trigger_send(sta, has_buffered, !buffer_local);
<------>else
<------><------>mps_frame_deliver(sta, 1);
}