1062 lines
30 KiB
C
1062 lines
30 KiB
C
// 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(c) 2015-2017 Intel Deutschland GmbH
|
|
* Copyright (C) 2018 - 2022 Intel Corporation
|
|
*/
|
|
|
|
#include <linux/ieee80211.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/export.h>
|
|
#include <net/mac80211.h>
|
|
#include "ieee80211_i.h"
|
|
#include "driver-ops.h"
|
|
#include "wme.h"
|
|
|
|
/**
|
|
* DOC: TX A-MPDU aggregation
|
|
*
|
|
* Aggregation on the TX side requires setting the hardware flag
|
|
* %IEEE80211_HW_AMPDU_AGGREGATION. The driver will then be handed
|
|
* packets with a flag indicating A-MPDU aggregation. The driver
|
|
* or device is responsible for actually aggregating the frames,
|
|
* as well as deciding how many and which to aggregate.
|
|
*
|
|
* When TX aggregation is started by some subsystem (usually the rate
|
|
* control algorithm would be appropriate) by calling the
|
|
* ieee80211_start_tx_ba_session() function, the driver will be
|
|
* notified via its @ampdu_action function, with the
|
|
* %IEEE80211_AMPDU_TX_START action.
|
|
*
|
|
* In response to that, the driver is later required to call the
|
|
* ieee80211_start_tx_ba_cb_irqsafe() function, which will really
|
|
* start the aggregation session after the peer has also responded.
|
|
* If the peer responds negatively, the session will be stopped
|
|
* again right away. Note that it is possible for the aggregation
|
|
* session to be stopped before the driver has indicated that it
|
|
* is done setting it up, in which case it must not indicate the
|
|
* setup completion.
|
|
*
|
|
* Also note that, since we also need to wait for a response from
|
|
* the peer, the driver is notified of the completion of the
|
|
* handshake by the %IEEE80211_AMPDU_TX_OPERATIONAL action to the
|
|
* @ampdu_action callback.
|
|
*
|
|
* Similarly, when the aggregation session is stopped by the peer
|
|
* or something calling ieee80211_stop_tx_ba_session(), the driver's
|
|
* @ampdu_action function will be called with the action
|
|
* %IEEE80211_AMPDU_TX_STOP. In this case, the call must not fail,
|
|
* and the driver must later call ieee80211_stop_tx_ba_cb_irqsafe().
|
|
* Note that the sta can get destroyed before the BA tear down is
|
|
* complete.
|
|
*/
|
|
|
|
static void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata,
|
|
const u8 *da, u16 tid,
|
|
u8 dialog_token, u16 start_seq_num,
|
|
u16 agg_size, u16 timeout)
|
|
{
|
|
struct ieee80211_local *local = sdata->local;
|
|
struct sk_buff *skb;
|
|
struct ieee80211_mgmt *mgmt;
|
|
u16 capab;
|
|
|
|
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->vif.cfg.ap_addr, 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.addba_req));
|
|
|
|
mgmt->u.action.category = WLAN_CATEGORY_BACK;
|
|
mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ;
|
|
|
|
mgmt->u.action.u.addba_req.dialog_token = dialog_token;
|
|
capab = IEEE80211_ADDBA_PARAM_AMSDU_MASK;
|
|
capab |= IEEE80211_ADDBA_PARAM_POLICY_MASK;
|
|
capab |= u16_encode_bits(tid, IEEE80211_ADDBA_PARAM_TID_MASK);
|
|
capab |= u16_encode_bits(agg_size, IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK);
|
|
|
|
mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab);
|
|
|
|
mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout);
|
|
mgmt->u.action.u.addba_req.start_seq_num =
|
|
cpu_to_le16(start_seq_num << 4);
|
|
|
|
ieee80211_tx_skb_tid(sdata, skb, tid, -1);
|
|
}
|
|
|
|
void ieee80211_send_bar(struct ieee80211_vif *vif, u8 *ra, u16 tid, u16 ssn)
|
|
{
|
|
struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
|
|
struct ieee80211_local *local = sdata->local;
|
|
struct sk_buff *skb;
|
|
struct ieee80211_bar *bar;
|
|
u16 bar_control = 0;
|
|
|
|
skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom);
|
|
if (!skb)
|
|
return;
|
|
|
|
skb_reserve(skb, local->hw.extra_tx_headroom);
|
|
bar = skb_put_zero(skb, sizeof(*bar));
|
|
bar->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
|
|
IEEE80211_STYPE_BACK_REQ);
|
|
memcpy(bar->ra, ra, ETH_ALEN);
|
|
memcpy(bar->ta, sdata->vif.addr, ETH_ALEN);
|
|
bar_control |= (u16)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL;
|
|
bar_control |= (u16)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA;
|
|
bar_control |= (u16)(tid << IEEE80211_BAR_CTRL_TID_INFO_SHIFT);
|
|
bar->control = cpu_to_le16(bar_control);
|
|
bar->start_seq_num = cpu_to_le16(ssn);
|
|
|
|
IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
|
|
IEEE80211_TX_CTL_REQ_TX_STATUS;
|
|
ieee80211_tx_skb_tid(sdata, skb, tid, -1);
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_send_bar);
|
|
|
|
void ieee80211_assign_tid_tx(struct sta_info *sta, int tid,
|
|
struct tid_ampdu_tx *tid_tx)
|
|
{
|
|
lockdep_assert_held(&sta->ampdu_mlme.mtx);
|
|
lockdep_assert_held(&sta->lock);
|
|
rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], tid_tx);
|
|
}
|
|
|
|
/*
|
|
* When multiple aggregation sessions on multiple stations
|
|
* are being created/destroyed simultaneously, we need to
|
|
* refcount the global queue stop caused by that in order
|
|
* to not get into a situation where one of the aggregation
|
|
* setup or teardown re-enables queues before the other is
|
|
* ready to handle that.
|
|
*
|
|
* These two functions take care of this issue by keeping
|
|
* a global "agg_queue_stop" refcount.
|
|
*/
|
|
static void __acquires(agg_queue)
|
|
ieee80211_stop_queue_agg(struct ieee80211_sub_if_data *sdata, int tid)
|
|
{
|
|
int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)];
|
|
|
|
/* we do refcounting here, so don't use the queue reason refcounting */
|
|
|
|
if (atomic_inc_return(&sdata->local->agg_queue_stop[queue]) == 1)
|
|
ieee80211_stop_queue_by_reason(
|
|
&sdata->local->hw, queue,
|
|
IEEE80211_QUEUE_STOP_REASON_AGGREGATION,
|
|
false);
|
|
__acquire(agg_queue);
|
|
}
|
|
|
|
static void __releases(agg_queue)
|
|
ieee80211_wake_queue_agg(struct ieee80211_sub_if_data *sdata, int tid)
|
|
{
|
|
int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)];
|
|
|
|
if (atomic_dec_return(&sdata->local->agg_queue_stop[queue]) == 0)
|
|
ieee80211_wake_queue_by_reason(
|
|
&sdata->local->hw, queue,
|
|
IEEE80211_QUEUE_STOP_REASON_AGGREGATION,
|
|
false);
|
|
__release(agg_queue);
|
|
}
|
|
|
|
static void
|
|
ieee80211_agg_stop_txq(struct sta_info *sta, int tid)
|
|
{
|
|
struct ieee80211_txq *txq = sta->sta.txq[tid];
|
|
struct ieee80211_sub_if_data *sdata;
|
|
struct fq *fq;
|
|
struct txq_info *txqi;
|
|
|
|
if (!txq)
|
|
return;
|
|
|
|
txqi = to_txq_info(txq);
|
|
sdata = vif_to_sdata(txq->vif);
|
|
fq = &sdata->local->fq;
|
|
|
|
/* Lock here to protect against further seqno updates on dequeue */
|
|
spin_lock_bh(&fq->lock);
|
|
set_bit(IEEE80211_TXQ_STOP, &txqi->flags);
|
|
spin_unlock_bh(&fq->lock);
|
|
}
|
|
|
|
static void
|
|
ieee80211_agg_start_txq(struct sta_info *sta, int tid, bool enable)
|
|
{
|
|
struct ieee80211_txq *txq = sta->sta.txq[tid];
|
|
struct txq_info *txqi;
|
|
|
|
lockdep_assert_held(&sta->ampdu_mlme.mtx);
|
|
|
|
if (!txq)
|
|
return;
|
|
|
|
txqi = to_txq_info(txq);
|
|
|
|
if (enable)
|
|
set_bit(IEEE80211_TXQ_AMPDU, &txqi->flags);
|
|
else
|
|
clear_bit(IEEE80211_TXQ_AMPDU, &txqi->flags);
|
|
|
|
clear_bit(IEEE80211_TXQ_STOP, &txqi->flags);
|
|
local_bh_disable();
|
|
rcu_read_lock();
|
|
schedule_and_wake_txq(sta->sdata->local, txqi);
|
|
rcu_read_unlock();
|
|
local_bh_enable();
|
|
}
|
|
|
|
/*
|
|
* splice packets from the STA's pending to the local pending,
|
|
* requires a call to ieee80211_agg_splice_finish later
|
|
*/
|
|
static void __acquires(agg_queue)
|
|
ieee80211_agg_splice_packets(struct ieee80211_sub_if_data *sdata,
|
|
struct tid_ampdu_tx *tid_tx, u16 tid)
|
|
{
|
|
struct ieee80211_local *local = sdata->local;
|
|
int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)];
|
|
unsigned long flags;
|
|
|
|
ieee80211_stop_queue_agg(sdata, tid);
|
|
|
|
if (WARN(!tid_tx,
|
|
"TID %d gone but expected when splicing aggregates from the pending queue\n",
|
|
tid))
|
|
return;
|
|
|
|
if (!skb_queue_empty(&tid_tx->pending)) {
|
|
spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
|
|
/* copy over remaining packets */
|
|
skb_queue_splice_tail_init(&tid_tx->pending,
|
|
&local->pending[queue]);
|
|
spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
|
|
}
|
|
}
|
|
|
|
static void __releases(agg_queue)
|
|
ieee80211_agg_splice_finish(struct ieee80211_sub_if_data *sdata, u16 tid)
|
|
{
|
|
ieee80211_wake_queue_agg(sdata, tid);
|
|
}
|
|
|
|
static void ieee80211_remove_tid_tx(struct sta_info *sta, int tid)
|
|
{
|
|
struct tid_ampdu_tx *tid_tx;
|
|
|
|
lockdep_assert_held(&sta->ampdu_mlme.mtx);
|
|
lockdep_assert_held(&sta->lock);
|
|
|
|
tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
|
|
|
|
/*
|
|
* When we get here, the TX path will not be lockless any more wrt.
|
|
* aggregation, since the OPERATIONAL bit has long been cleared.
|
|
* Thus it will block on getting the lock, if it occurs. So if we
|
|
* stop the queue now, we will not get any more packets, and any
|
|
* that might be being processed will wait for us here, thereby
|
|
* guaranteeing that no packets go to the tid_tx pending queue any
|
|
* more.
|
|
*/
|
|
|
|
ieee80211_agg_splice_packets(sta->sdata, tid_tx, tid);
|
|
|
|
/* future packets must not find the tid_tx struct any more */
|
|
ieee80211_assign_tid_tx(sta, tid, NULL);
|
|
|
|
ieee80211_agg_splice_finish(sta->sdata, tid);
|
|
|
|
kfree_rcu(tid_tx, rcu_head);
|
|
}
|
|
|
|
int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
|
|
enum ieee80211_agg_stop_reason reason)
|
|
{
|
|
struct ieee80211_local *local = sta->local;
|
|
struct tid_ampdu_tx *tid_tx;
|
|
struct ieee80211_ampdu_params params = {
|
|
.sta = &sta->sta,
|
|
.tid = tid,
|
|
.buf_size = 0,
|
|
.amsdu = false,
|
|
.timeout = 0,
|
|
.ssn = 0,
|
|
};
|
|
int ret;
|
|
|
|
lockdep_assert_held(&sta->ampdu_mlme.mtx);
|
|
|
|
switch (reason) {
|
|
case AGG_STOP_DECLINED:
|
|
case AGG_STOP_LOCAL_REQUEST:
|
|
case AGG_STOP_PEER_REQUEST:
|
|
params.action = IEEE80211_AMPDU_TX_STOP_CONT;
|
|
break;
|
|
case AGG_STOP_DESTROY_STA:
|
|
params.action = IEEE80211_AMPDU_TX_STOP_FLUSH;
|
|
break;
|
|
default:
|
|
WARN_ON_ONCE(1);
|
|
return -EINVAL;
|
|
}
|
|
|
|
spin_lock_bh(&sta->lock);
|
|
|
|
/* free struct pending for start, if present */
|
|
tid_tx = sta->ampdu_mlme.tid_start_tx[tid];
|
|
kfree(tid_tx);
|
|
sta->ampdu_mlme.tid_start_tx[tid] = NULL;
|
|
|
|
tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
|
|
if (!tid_tx) {
|
|
spin_unlock_bh(&sta->lock);
|
|
return -ENOENT;
|
|
}
|
|
|
|
/*
|
|
* if we're already stopping ignore any new requests to stop
|
|
* unless we're destroying it in which case notify the driver
|
|
*/
|
|
if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
|
|
spin_unlock_bh(&sta->lock);
|
|
if (reason != AGG_STOP_DESTROY_STA)
|
|
return -EALREADY;
|
|
params.action = IEEE80211_AMPDU_TX_STOP_FLUSH_CONT;
|
|
ret = drv_ampdu_action(local, sta->sdata, ¶ms);
|
|
WARN_ON_ONCE(ret);
|
|
return 0;
|
|
}
|
|
|
|
if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
|
|
/* not even started yet! */
|
|
ieee80211_assign_tid_tx(sta, tid, NULL);
|
|
spin_unlock_bh(&sta->lock);
|
|
kfree_rcu(tid_tx, rcu_head);
|
|
return 0;
|
|
}
|
|
|
|
set_bit(HT_AGG_STATE_STOPPING, &tid_tx->state);
|
|
|
|
ieee80211_agg_stop_txq(sta, tid);
|
|
|
|
spin_unlock_bh(&sta->lock);
|
|
|
|
ht_dbg(sta->sdata, "Tx BA session stop requested for %pM tid %u\n",
|
|
sta->sta.addr, tid);
|
|
|
|
del_timer_sync(&tid_tx->addba_resp_timer);
|
|
del_timer_sync(&tid_tx->session_timer);
|
|
|
|
/*
|
|
* After this packets are no longer handed right through
|
|
* to the driver but are put onto tid_tx->pending instead,
|
|
* with locking to ensure proper access.
|
|
*/
|
|
clear_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state);
|
|
|
|
/*
|
|
* There might be a few packets being processed right now (on
|
|
* another CPU) that have already gotten past the aggregation
|
|
* check when it was still OPERATIONAL and consequently have
|
|
* IEEE80211_TX_CTL_AMPDU set. In that case, this code might
|
|
* call into the driver at the same time or even before the
|
|
* TX paths calls into it, which could confuse the driver.
|
|
*
|
|
* Wait for all currently running TX paths to finish before
|
|
* telling the driver. New packets will not go through since
|
|
* the aggregation session is no longer OPERATIONAL.
|
|
*/
|
|
if (!local->in_reconfig)
|
|
synchronize_net();
|
|
|
|
tid_tx->stop_initiator = reason == AGG_STOP_PEER_REQUEST ?
|
|
WLAN_BACK_RECIPIENT :
|
|
WLAN_BACK_INITIATOR;
|
|
tid_tx->tx_stop = reason == AGG_STOP_LOCAL_REQUEST;
|
|
|
|
ret = drv_ampdu_action(local, sta->sdata, ¶ms);
|
|
|
|
/* HW shall not deny going back to legacy */
|
|
if (WARN_ON(ret)) {
|
|
/*
|
|
* We may have pending packets get stuck in this case...
|
|
* Not bothering with a workaround for now.
|
|
*/
|
|
}
|
|
|
|
/*
|
|
* In the case of AGG_STOP_DESTROY_STA, the driver won't
|
|
* necessarily call ieee80211_stop_tx_ba_cb(), so this may
|
|
* seem like we can leave the tid_tx data pending forever.
|
|
* This is true, in a way, but "forever" is only until the
|
|
* station struct is actually destroyed. In the meantime,
|
|
* leaving it around ensures that we don't transmit packets
|
|
* to the driver on this TID which might confuse it.
|
|
*/
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* After sending add Block Ack request we activated a timer until
|
|
* add Block Ack response will arrive from the recipient.
|
|
* If this timer expires sta_addba_resp_timer_expired will be executed.
|
|
*/
|
|
static void sta_addba_resp_timer_expired(struct timer_list *t)
|
|
{
|
|
struct tid_ampdu_tx *tid_tx = from_timer(tid_tx, t, addba_resp_timer);
|
|
struct sta_info *sta = tid_tx->sta;
|
|
u8 tid = tid_tx->tid;
|
|
|
|
/* check if the TID waits for addBA response */
|
|
if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) {
|
|
ht_dbg(sta->sdata,
|
|
"timer expired on %pM tid %d not expecting addBA response\n",
|
|
sta->sta.addr, tid);
|
|
return;
|
|
}
|
|
|
|
ht_dbg(sta->sdata, "addBA response timer expired on %pM tid %d\n",
|
|
sta->sta.addr, tid);
|
|
|
|
ieee80211_stop_tx_ba_session(&sta->sta, tid);
|
|
}
|
|
|
|
static void ieee80211_send_addba_with_timeout(struct sta_info *sta,
|
|
struct tid_ampdu_tx *tid_tx)
|
|
{
|
|
struct ieee80211_sub_if_data *sdata = sta->sdata;
|
|
struct ieee80211_local *local = sta->local;
|
|
u8 tid = tid_tx->tid;
|
|
u16 buf_size;
|
|
|
|
/* activate the timer for the recipient's addBA response */
|
|
mod_timer(&tid_tx->addba_resp_timer, jiffies + ADDBA_RESP_INTERVAL);
|
|
ht_dbg(sdata, "activated addBA response timer on %pM tid %d\n",
|
|
sta->sta.addr, tid);
|
|
|
|
spin_lock_bh(&sta->lock);
|
|
sta->ampdu_mlme.last_addba_req_time[tid] = jiffies;
|
|
sta->ampdu_mlme.addba_req_num[tid]++;
|
|
spin_unlock_bh(&sta->lock);
|
|
|
|
if (sta->sta.deflink.he_cap.has_he) {
|
|
buf_size = local->hw.max_tx_aggregation_subframes;
|
|
} else {
|
|
/*
|
|
* We really should use what the driver told us it will
|
|
* transmit as the maximum, but certain APs (e.g. the
|
|
* LinkSys WRT120N with FW v1.0.07 build 002 Jun 18 2012)
|
|
* will crash when we use a lower number.
|
|
*/
|
|
buf_size = IEEE80211_MAX_AMPDU_BUF_HT;
|
|
}
|
|
|
|
/* send AddBA request */
|
|
ieee80211_send_addba_request(sdata, sta->sta.addr, tid,
|
|
tid_tx->dialog_token, tid_tx->ssn,
|
|
buf_size, tid_tx->timeout);
|
|
|
|
WARN_ON(test_and_set_bit(HT_AGG_STATE_SENT_ADDBA, &tid_tx->state));
|
|
}
|
|
|
|
void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid)
|
|
{
|
|
struct tid_ampdu_tx *tid_tx;
|
|
struct ieee80211_local *local = sta->local;
|
|
struct ieee80211_sub_if_data *sdata;
|
|
struct ieee80211_ampdu_params params = {
|
|
.sta = &sta->sta,
|
|
.action = IEEE80211_AMPDU_TX_START,
|
|
.tid = tid,
|
|
.buf_size = 0,
|
|
.amsdu = false,
|
|
.timeout = 0,
|
|
};
|
|
int ret;
|
|
|
|
tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
|
|
|
|
/*
|
|
* Start queuing up packets for this aggregation session.
|
|
* We're going to release them once the driver is OK with
|
|
* that.
|
|
*/
|
|
clear_bit(HT_AGG_STATE_WANT_START, &tid_tx->state);
|
|
|
|
/*
|
|
* Make sure no packets are being processed. This ensures that
|
|
* we have a valid starting sequence number and that in-flight
|
|
* packets have been flushed out and no packets for this TID
|
|
* will go into the driver during the ampdu_action call.
|
|
*/
|
|
synchronize_net();
|
|
|
|
sdata = sta->sdata;
|
|
params.ssn = sta->tid_seq[tid] >> 4;
|
|
ret = drv_ampdu_action(local, sdata, ¶ms);
|
|
tid_tx->ssn = params.ssn;
|
|
if (ret == IEEE80211_AMPDU_TX_START_DELAY_ADDBA) {
|
|
return;
|
|
} else if (ret == IEEE80211_AMPDU_TX_START_IMMEDIATE) {
|
|
/*
|
|
* We didn't send the request yet, so don't need to check
|
|
* here if we already got a response, just mark as driver
|
|
* ready immediately.
|
|
*/
|
|
set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state);
|
|
} else if (ret) {
|
|
if (!sdata)
|
|
return;
|
|
|
|
ht_dbg(sdata,
|
|
"BA request denied - HW unavailable for %pM tid %d\n",
|
|
sta->sta.addr, tid);
|
|
spin_lock_bh(&sta->lock);
|
|
ieee80211_agg_splice_packets(sdata, tid_tx, tid);
|
|
ieee80211_assign_tid_tx(sta, tid, NULL);
|
|
ieee80211_agg_splice_finish(sdata, tid);
|
|
spin_unlock_bh(&sta->lock);
|
|
|
|
ieee80211_agg_start_txq(sta, tid, false);
|
|
|
|
kfree_rcu(tid_tx, rcu_head);
|
|
return;
|
|
}
|
|
|
|
ieee80211_send_addba_with_timeout(sta, tid_tx);
|
|
}
|
|
|
|
void ieee80211_refresh_tx_agg_session_timer(struct ieee80211_sta *pubsta,
|
|
u16 tid)
|
|
{
|
|
struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
|
|
struct tid_ampdu_tx *tid_tx;
|
|
|
|
if (WARN_ON_ONCE(tid >= IEEE80211_NUM_TIDS))
|
|
return;
|
|
|
|
tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
|
|
if (!tid_tx)
|
|
return;
|
|
|
|
tid_tx->last_tx = jiffies;
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_refresh_tx_agg_session_timer);
|
|
|
|
/*
|
|
* After accepting the AddBA Response we activated a timer,
|
|
* resetting it after each frame that we send.
|
|
*/
|
|
static void sta_tx_agg_session_timer_expired(struct timer_list *t)
|
|
{
|
|
struct tid_ampdu_tx *tid_tx = from_timer(tid_tx, t, session_timer);
|
|
struct sta_info *sta = tid_tx->sta;
|
|
u8 tid = tid_tx->tid;
|
|
unsigned long timeout;
|
|
|
|
if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
|
|
return;
|
|
}
|
|
|
|
timeout = tid_tx->last_tx + TU_TO_JIFFIES(tid_tx->timeout);
|
|
if (time_is_after_jiffies(timeout)) {
|
|
mod_timer(&tid_tx->session_timer, timeout);
|
|
return;
|
|
}
|
|
|
|
ht_dbg(sta->sdata, "tx session timer expired on %pM tid %d\n",
|
|
sta->sta.addr, tid);
|
|
|
|
ieee80211_stop_tx_ba_session(&sta->sta, tid);
|
|
}
|
|
|
|
int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid,
|
|
u16 timeout)
|
|
{
|
|
struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
|
|
struct ieee80211_sub_if_data *sdata = sta->sdata;
|
|
struct ieee80211_local *local = sdata->local;
|
|
struct tid_ampdu_tx *tid_tx;
|
|
int ret = 0;
|
|
|
|
trace_api_start_tx_ba_session(pubsta, tid);
|
|
|
|
if (WARN(sta->reserved_tid == tid,
|
|
"Requested to start BA session on reserved tid=%d", tid))
|
|
return -EINVAL;
|
|
|
|
if (!pubsta->deflink.ht_cap.ht_supported &&
|
|
sta->sdata->vif.bss_conf.chandef.chan->band != NL80211_BAND_6GHZ)
|
|
return -EINVAL;
|
|
|
|
if (WARN_ON_ONCE(!local->ops->ampdu_action))
|
|
return -EINVAL;
|
|
|
|
if ((tid >= IEEE80211_NUM_TIDS) ||
|
|
!ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) ||
|
|
ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW))
|
|
return -EINVAL;
|
|
|
|
if (WARN_ON(tid >= IEEE80211_FIRST_TSPEC_TSID))
|
|
return -EINVAL;
|
|
|
|
ht_dbg(sdata, "Open BA session requested for %pM tid %u\n",
|
|
pubsta->addr, tid);
|
|
|
|
if (sdata->vif.type != NL80211_IFTYPE_STATION &&
|
|
sdata->vif.type != NL80211_IFTYPE_MESH_POINT &&
|
|
sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
|
|
sdata->vif.type != NL80211_IFTYPE_AP &&
|
|
sdata->vif.type != NL80211_IFTYPE_ADHOC)
|
|
return -EINVAL;
|
|
|
|
if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) {
|
|
ht_dbg(sdata,
|
|
"BA sessions blocked - Denying BA session request %pM tid %d\n",
|
|
sta->sta.addr, tid);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (test_sta_flag(sta, WLAN_STA_MFP) &&
|
|
!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) {
|
|
ht_dbg(sdata,
|
|
"MFP STA not authorized - deny BA session request %pM tid %d\n",
|
|
sta->sta.addr, tid);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* 802.11n-2009 11.5.1.1: If the initiating STA is an HT STA, is a
|
|
* member of an IBSS, and has no other existing Block Ack agreement
|
|
* with the recipient STA, then the initiating STA shall transmit a
|
|
* Probe Request frame to the recipient STA and shall not transmit an
|
|
* ADDBA Request frame unless it receives a Probe Response frame
|
|
* from the recipient within dot11ADDBAFailureTimeout.
|
|
*
|
|
* The probe request mechanism for ADDBA is currently not implemented,
|
|
* but we only build up Block Ack session with HT STAs. This information
|
|
* is set when we receive a bss info from a probe response or a beacon.
|
|
*/
|
|
if (sta->sdata->vif.type == NL80211_IFTYPE_ADHOC &&
|
|
!sta->sta.deflink.ht_cap.ht_supported) {
|
|
ht_dbg(sdata,
|
|
"BA request denied - IBSS STA %pM does not advertise HT support\n",
|
|
pubsta->addr);
|
|
return -EINVAL;
|
|
}
|
|
|
|
spin_lock_bh(&sta->lock);
|
|
|
|
/* we have tried too many times, receiver does not want A-MPDU */
|
|
if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) {
|
|
ret = -EBUSY;
|
|
goto err_unlock_sta;
|
|
}
|
|
|
|
/*
|
|
* if we have tried more than HT_AGG_BURST_RETRIES times we
|
|
* will spread our requests in time to avoid stalling connection
|
|
* for too long
|
|
*/
|
|
if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_BURST_RETRIES &&
|
|
time_before(jiffies, sta->ampdu_mlme.last_addba_req_time[tid] +
|
|
HT_AGG_RETRIES_PERIOD)) {
|
|
ht_dbg(sdata,
|
|
"BA request denied - %d failed requests on %pM tid %u\n",
|
|
sta->ampdu_mlme.addba_req_num[tid], sta->sta.addr, tid);
|
|
ret = -EBUSY;
|
|
goto err_unlock_sta;
|
|
}
|
|
|
|
tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
|
|
/* check if the TID is not in aggregation flow already */
|
|
if (tid_tx || sta->ampdu_mlme.tid_start_tx[tid]) {
|
|
ht_dbg(sdata,
|
|
"BA request denied - session is not idle on %pM tid %u\n",
|
|
sta->sta.addr, tid);
|
|
ret = -EAGAIN;
|
|
goto err_unlock_sta;
|
|
}
|
|
|
|
/* prepare A-MPDU MLME for Tx aggregation */
|
|
tid_tx = kzalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
|
|
if (!tid_tx) {
|
|
ret = -ENOMEM;
|
|
goto err_unlock_sta;
|
|
}
|
|
|
|
skb_queue_head_init(&tid_tx->pending);
|
|
__set_bit(HT_AGG_STATE_WANT_START, &tid_tx->state);
|
|
|
|
tid_tx->timeout = timeout;
|
|
tid_tx->sta = sta;
|
|
tid_tx->tid = tid;
|
|
|
|
/* response timer */
|
|
timer_setup(&tid_tx->addba_resp_timer, sta_addba_resp_timer_expired, 0);
|
|
|
|
/* tx timer */
|
|
timer_setup(&tid_tx->session_timer,
|
|
sta_tx_agg_session_timer_expired, TIMER_DEFERRABLE);
|
|
|
|
/* assign a dialog token */
|
|
sta->ampdu_mlme.dialog_token_allocator++;
|
|
tid_tx->dialog_token = sta->ampdu_mlme.dialog_token_allocator;
|
|
|
|
/*
|
|
* Finally, assign it to the start array; the work item will
|
|
* collect it and move it to the normal array.
|
|
*/
|
|
sta->ampdu_mlme.tid_start_tx[tid] = tid_tx;
|
|
|
|
ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work);
|
|
|
|
/* this flow continues off the work */
|
|
err_unlock_sta:
|
|
spin_unlock_bh(&sta->lock);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
|
|
|
|
static void ieee80211_agg_tx_operational(struct ieee80211_local *local,
|
|
struct sta_info *sta, u16 tid)
|
|
{
|
|
struct tid_ampdu_tx *tid_tx;
|
|
struct ieee80211_ampdu_params params = {
|
|
.sta = &sta->sta,
|
|
.action = IEEE80211_AMPDU_TX_OPERATIONAL,
|
|
.tid = tid,
|
|
.timeout = 0,
|
|
.ssn = 0,
|
|
};
|
|
|
|
lockdep_assert_held(&sta->ampdu_mlme.mtx);
|
|
|
|
tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
|
|
params.buf_size = tid_tx->buf_size;
|
|
params.amsdu = tid_tx->amsdu;
|
|
|
|
ht_dbg(sta->sdata, "Aggregation is on for %pM tid %d\n",
|
|
sta->sta.addr, tid);
|
|
|
|
drv_ampdu_action(local, sta->sdata, ¶ms);
|
|
|
|
/*
|
|
* synchronize with TX path, while splicing the TX path
|
|
* should block so it won't put more packets onto pending.
|
|
*/
|
|
spin_lock_bh(&sta->lock);
|
|
|
|
ieee80211_agg_splice_packets(sta->sdata, tid_tx, tid);
|
|
/*
|
|
* Now mark as operational. This will be visible
|
|
* in the TX path, and lets it go lock-free in
|
|
* the common case.
|
|
*/
|
|
set_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state);
|
|
ieee80211_agg_splice_finish(sta->sdata, tid);
|
|
|
|
spin_unlock_bh(&sta->lock);
|
|
|
|
ieee80211_agg_start_txq(sta, tid, true);
|
|
}
|
|
|
|
void ieee80211_start_tx_ba_cb(struct sta_info *sta, int tid,
|
|
struct tid_ampdu_tx *tid_tx)
|
|
{
|
|
struct ieee80211_sub_if_data *sdata = sta->sdata;
|
|
struct ieee80211_local *local = sdata->local;
|
|
|
|
if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state)))
|
|
return;
|
|
|
|
if (!test_bit(HT_AGG_STATE_SENT_ADDBA, &tid_tx->state)) {
|
|
ieee80211_send_addba_with_timeout(sta, tid_tx);
|
|
/* RESPONSE_RECEIVED state whould trigger the flow again */
|
|
return;
|
|
}
|
|
|
|
if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state))
|
|
ieee80211_agg_tx_operational(local, sta, tid);
|
|
}
|
|
|
|
static struct tid_ampdu_tx *
|
|
ieee80211_lookup_tid_tx(struct ieee80211_sub_if_data *sdata,
|
|
const u8 *ra, u16 tid, struct sta_info **sta)
|
|
{
|
|
struct tid_ampdu_tx *tid_tx;
|
|
|
|
if (tid >= IEEE80211_NUM_TIDS) {
|
|
ht_dbg(sdata, "Bad TID value: tid = %d (>= %d)\n",
|
|
tid, IEEE80211_NUM_TIDS);
|
|
return NULL;
|
|
}
|
|
|
|
*sta = sta_info_get_bss(sdata, ra);
|
|
if (!*sta) {
|
|
ht_dbg(sdata, "Could not find station: %pM\n", ra);
|
|
return NULL;
|
|
}
|
|
|
|
tid_tx = rcu_dereference((*sta)->ampdu_mlme.tid_tx[tid]);
|
|
|
|
if (WARN_ON(!tid_tx))
|
|
ht_dbg(sdata, "addBA was not requested!\n");
|
|
|
|
return tid_tx;
|
|
}
|
|
|
|
void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_vif *vif,
|
|
const u8 *ra, u16 tid)
|
|
{
|
|
struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
|
|
struct ieee80211_local *local = sdata->local;
|
|
struct sta_info *sta;
|
|
struct tid_ampdu_tx *tid_tx;
|
|
|
|
trace_api_start_tx_ba_cb(sdata, ra, tid);
|
|
|
|
rcu_read_lock();
|
|
tid_tx = ieee80211_lookup_tid_tx(sdata, ra, tid, &sta);
|
|
if (!tid_tx)
|
|
goto out;
|
|
|
|
set_bit(HT_AGG_STATE_START_CB, &tid_tx->state);
|
|
ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work);
|
|
out:
|
|
rcu_read_unlock();
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
|
|
|
|
int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
|
|
enum ieee80211_agg_stop_reason reason)
|
|
{
|
|
int ret;
|
|
|
|
mutex_lock(&sta->ampdu_mlme.mtx);
|
|
|
|
ret = ___ieee80211_stop_tx_ba_session(sta, tid, reason);
|
|
|
|
mutex_unlock(&sta->ampdu_mlme.mtx);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid)
|
|
{
|
|
struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
|
|
struct ieee80211_sub_if_data *sdata = sta->sdata;
|
|
struct ieee80211_local *local = sdata->local;
|
|
struct tid_ampdu_tx *tid_tx;
|
|
int ret = 0;
|
|
|
|
trace_api_stop_tx_ba_session(pubsta, tid);
|
|
|
|
if (!local->ops->ampdu_action)
|
|
return -EINVAL;
|
|
|
|
if (tid >= IEEE80211_NUM_TIDS)
|
|
return -EINVAL;
|
|
|
|
spin_lock_bh(&sta->lock);
|
|
tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
|
|
|
|
if (!tid_tx) {
|
|
ret = -ENOENT;
|
|
goto unlock;
|
|
}
|
|
|
|
WARN(sta->reserved_tid == tid,
|
|
"Requested to stop BA session on reserved tid=%d", tid);
|
|
|
|
if (test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
|
|
/* already in progress stopping it */
|
|
ret = 0;
|
|
goto unlock;
|
|
}
|
|
|
|
set_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state);
|
|
ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work);
|
|
|
|
unlock:
|
|
spin_unlock_bh(&sta->lock);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
|
|
|
|
void ieee80211_stop_tx_ba_cb(struct sta_info *sta, int tid,
|
|
struct tid_ampdu_tx *tid_tx)
|
|
{
|
|
struct ieee80211_sub_if_data *sdata = sta->sdata;
|
|
bool send_delba = false;
|
|
bool start_txq = false;
|
|
|
|
ht_dbg(sdata, "Stopping Tx BA session for %pM tid %d\n",
|
|
sta->sta.addr, tid);
|
|
|
|
spin_lock_bh(&sta->lock);
|
|
|
|
if (!test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
|
|
ht_dbg(sdata,
|
|
"unexpected callback to A-MPDU stop for %pM tid %d\n",
|
|
sta->sta.addr, tid);
|
|
goto unlock_sta;
|
|
}
|
|
|
|
if (tid_tx->stop_initiator == WLAN_BACK_INITIATOR && tid_tx->tx_stop)
|
|
send_delba = true;
|
|
|
|
ieee80211_remove_tid_tx(sta, tid);
|
|
start_txq = true;
|
|
|
|
unlock_sta:
|
|
spin_unlock_bh(&sta->lock);
|
|
|
|
if (start_txq)
|
|
ieee80211_agg_start_txq(sta, tid, false);
|
|
|
|
if (send_delba)
|
|
ieee80211_send_delba(sdata, sta->sta.addr, tid,
|
|
WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
|
|
}
|
|
|
|
void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_vif *vif,
|
|
const u8 *ra, u16 tid)
|
|
{
|
|
struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
|
|
struct ieee80211_local *local = sdata->local;
|
|
struct sta_info *sta;
|
|
struct tid_ampdu_tx *tid_tx;
|
|
|
|
trace_api_stop_tx_ba_cb(sdata, ra, tid);
|
|
|
|
rcu_read_lock();
|
|
tid_tx = ieee80211_lookup_tid_tx(sdata, ra, tid, &sta);
|
|
if (!tid_tx)
|
|
goto out;
|
|
|
|
set_bit(HT_AGG_STATE_STOP_CB, &tid_tx->state);
|
|
ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work);
|
|
out:
|
|
rcu_read_unlock();
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);
|
|
|
|
|
|
void ieee80211_process_addba_resp(struct ieee80211_local *local,
|
|
struct sta_info *sta,
|
|
struct ieee80211_mgmt *mgmt,
|
|
size_t len)
|
|
{
|
|
struct tid_ampdu_tx *tid_tx;
|
|
struct ieee80211_txq *txq;
|
|
u16 capab, tid, buf_size;
|
|
bool amsdu;
|
|
|
|
capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab);
|
|
amsdu = capab & IEEE80211_ADDBA_PARAM_AMSDU_MASK;
|
|
tid = u16_get_bits(capab, IEEE80211_ADDBA_PARAM_TID_MASK);
|
|
buf_size = u16_get_bits(capab, IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK);
|
|
buf_size = min(buf_size, local->hw.max_tx_aggregation_subframes);
|
|
|
|
txq = sta->sta.txq[tid];
|
|
if (!amsdu && txq)
|
|
set_bit(IEEE80211_TXQ_NO_AMSDU, &to_txq_info(txq)->flags);
|
|
|
|
mutex_lock(&sta->ampdu_mlme.mtx);
|
|
|
|
tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
|
|
if (!tid_tx)
|
|
goto out;
|
|
|
|
if (mgmt->u.action.u.addba_resp.dialog_token != tid_tx->dialog_token) {
|
|
ht_dbg(sta->sdata, "wrong addBA response token, %pM tid %d\n",
|
|
sta->sta.addr, tid);
|
|
goto out;
|
|
}
|
|
|
|
del_timer_sync(&tid_tx->addba_resp_timer);
|
|
|
|
ht_dbg(sta->sdata, "switched off addBA timer for %pM tid %d\n",
|
|
sta->sta.addr, tid);
|
|
|
|
/*
|
|
* addba_resp_timer may have fired before we got here, and
|
|
* caused WANT_STOP to be set. If the stop then was already
|
|
* processed further, STOPPING might be set.
|
|
*/
|
|
if (test_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state) ||
|
|
test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
|
|
ht_dbg(sta->sdata,
|
|
"got addBA resp for %pM tid %d but we already gave up\n",
|
|
sta->sta.addr, tid);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* IEEE 802.11-2007 7.3.1.14:
|
|
* In an ADDBA Response frame, when the Status Code field
|
|
* is set to 0, the Buffer Size subfield is set to a value
|
|
* of at least 1.
|
|
*/
|
|
if (le16_to_cpu(mgmt->u.action.u.addba_resp.status)
|
|
== WLAN_STATUS_SUCCESS && buf_size) {
|
|
if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED,
|
|
&tid_tx->state)) {
|
|
/* ignore duplicate response */
|
|
goto out;
|
|
}
|
|
|
|
tid_tx->buf_size = buf_size;
|
|
tid_tx->amsdu = amsdu;
|
|
|
|
if (test_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state))
|
|
ieee80211_agg_tx_operational(local, sta, tid);
|
|
|
|
sta->ampdu_mlme.addba_req_num[tid] = 0;
|
|
|
|
tid_tx->timeout =
|
|
le16_to_cpu(mgmt->u.action.u.addba_resp.timeout);
|
|
|
|
if (tid_tx->timeout) {
|
|
mod_timer(&tid_tx->session_timer,
|
|
TU_TO_EXP_TIME(tid_tx->timeout));
|
|
tid_tx->last_tx = jiffies;
|
|
}
|
|
|
|
} else {
|
|
___ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_DECLINED);
|
|
}
|
|
|
|
out:
|
|
mutex_unlock(&sta->ampdu_mlme.mtx);
|
|
}
|