![Paul Gortmaker](/assets/img/avatar_default.png)
These files are non modular, but need to export symbols using the macros now living in export.h -- call out the include so that things won't break when we remove the implicit presence of module.h from everywhere. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
793 lines
22 KiB
C
793 lines
22 KiB
C
/*
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* HT handling
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*
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* Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
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* Copyright 2002-2005, Instant802 Networks, Inc.
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* Copyright 2005-2006, Devicescape Software, Inc.
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* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
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* Copyright 2007, Michael Wu <flamingice@sourmilk.net>
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* Copyright 2007-2010, Intel Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/ieee80211.h>
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#include <linux/slab.h>
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#include <linux/export.h>
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#include <net/mac80211.h>
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#include "ieee80211_i.h"
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#include "driver-ops.h"
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#include "wme.h"
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/**
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* DOC: TX A-MPDU aggregation
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*
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* Aggregation on the TX side requires setting the hardware flag
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* %IEEE80211_HW_AMPDU_AGGREGATION. The driver will then be handed
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* packets with a flag indicating A-MPDU aggregation. The driver
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* or device is responsible for actually aggregating the frames,
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* as well as deciding how many and which to aggregate.
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*
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* When TX aggregation is started by some subsystem (usually the rate
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* control algorithm would be appropriate) by calling the
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* ieee80211_start_tx_ba_session() function, the driver will be
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* notified via its @ampdu_action function, with the
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* %IEEE80211_AMPDU_TX_START action.
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*
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* In response to that, the driver is later required to call the
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* ieee80211_start_tx_ba_cb_irqsafe() function, which will really
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* start the aggregation session after the peer has also responded.
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* If the peer responds negatively, the session will be stopped
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* again right away. Note that it is possible for the aggregation
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* session to be stopped before the driver has indicated that it
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* is done setting it up, in which case it must not indicate the
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* setup completion.
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*
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* Also note that, since we also need to wait for a response from
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* the peer, the driver is notified of the completion of the
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* handshake by the %IEEE80211_AMPDU_TX_OPERATIONAL action to the
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* @ampdu_action callback.
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*
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* Similarly, when the aggregation session is stopped by the peer
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* or something calling ieee80211_stop_tx_ba_session(), the driver's
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* @ampdu_action function will be called with the action
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* %IEEE80211_AMPDU_TX_STOP. In this case, the call must not fail,
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* and the driver must later call ieee80211_stop_tx_ba_cb_irqsafe().
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*/
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static void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata,
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const u8 *da, u16 tid,
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u8 dialog_token, u16 start_seq_num,
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u16 agg_size, u16 timeout)
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{
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struct ieee80211_local *local = sdata->local;
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struct sk_buff *skb;
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struct ieee80211_mgmt *mgmt;
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u16 capab;
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skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
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if (!skb)
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return;
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skb_reserve(skb, local->hw.extra_tx_headroom);
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mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
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memset(mgmt, 0, 24);
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memcpy(mgmt->da, da, ETH_ALEN);
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memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
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if (sdata->vif.type == NL80211_IFTYPE_AP ||
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sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
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memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
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else if (sdata->vif.type == NL80211_IFTYPE_STATION)
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memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
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mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
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IEEE80211_STYPE_ACTION);
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skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_req));
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mgmt->u.action.category = WLAN_CATEGORY_BACK;
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mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ;
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mgmt->u.action.u.addba_req.dialog_token = dialog_token;
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capab = (u16)(1 << 1); /* bit 1 aggregation policy */
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capab |= (u16)(tid << 2); /* bit 5:2 TID number */
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capab |= (u16)(agg_size << 6); /* bit 15:6 max size of aggergation */
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mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab);
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mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout);
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mgmt->u.action.u.addba_req.start_seq_num =
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cpu_to_le16(start_seq_num << 4);
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ieee80211_tx_skb(sdata, skb);
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}
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void ieee80211_send_bar(struct ieee80211_vif *vif, u8 *ra, u16 tid, u16 ssn)
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{
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struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
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struct ieee80211_local *local = sdata->local;
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struct sk_buff *skb;
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struct ieee80211_bar *bar;
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u16 bar_control = 0;
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skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom);
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if (!skb)
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return;
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skb_reserve(skb, local->hw.extra_tx_headroom);
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bar = (struct ieee80211_bar *)skb_put(skb, sizeof(*bar));
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memset(bar, 0, sizeof(*bar));
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bar->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
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IEEE80211_STYPE_BACK_REQ);
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memcpy(bar->ra, ra, ETH_ALEN);
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memcpy(bar->ta, sdata->vif.addr, ETH_ALEN);
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bar_control |= (u16)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL;
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bar_control |= (u16)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA;
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bar_control |= (u16)(tid << IEEE80211_BAR_CTRL_TID_INFO_SHIFT);
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bar->control = cpu_to_le16(bar_control);
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bar->start_seq_num = cpu_to_le16(ssn);
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IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
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ieee80211_tx_skb(sdata, skb);
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}
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EXPORT_SYMBOL(ieee80211_send_bar);
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void ieee80211_assign_tid_tx(struct sta_info *sta, int tid,
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struct tid_ampdu_tx *tid_tx)
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{
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lockdep_assert_held(&sta->ampdu_mlme.mtx);
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lockdep_assert_held(&sta->lock);
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rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], tid_tx);
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}
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int ___ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
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enum ieee80211_back_parties initiator,
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bool tx)
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{
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struct ieee80211_local *local = sta->local;
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struct tid_ampdu_tx *tid_tx;
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int ret;
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lockdep_assert_held(&sta->ampdu_mlme.mtx);
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spin_lock_bh(&sta->lock);
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tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
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if (!tid_tx) {
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spin_unlock_bh(&sta->lock);
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return -ENOENT;
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}
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if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
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/* not even started yet! */
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ieee80211_assign_tid_tx(sta, tid, NULL);
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spin_unlock_bh(&sta->lock);
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kfree_rcu(tid_tx, rcu_head);
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return 0;
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}
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spin_unlock_bh(&sta->lock);
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#ifdef CONFIG_MAC80211_HT_DEBUG
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printk(KERN_DEBUG "Tx BA session stop requested for %pM tid %u\n",
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sta->sta.addr, tid);
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#endif /* CONFIG_MAC80211_HT_DEBUG */
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set_bit(HT_AGG_STATE_STOPPING, &tid_tx->state);
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del_timer_sync(&tid_tx->addba_resp_timer);
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/*
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* After this packets are no longer handed right through
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* to the driver but are put onto tid_tx->pending instead,
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* with locking to ensure proper access.
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*/
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clear_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state);
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tid_tx->stop_initiator = initiator;
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tid_tx->tx_stop = tx;
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ret = drv_ampdu_action(local, sta->sdata,
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IEEE80211_AMPDU_TX_STOP,
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&sta->sta, tid, NULL, 0);
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/* HW shall not deny going back to legacy */
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if (WARN_ON(ret)) {
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/*
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* We may have pending packets get stuck in this case...
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* Not bothering with a workaround for now.
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*/
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}
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return ret;
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}
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/*
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* After sending add Block Ack request we activated a timer until
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* add Block Ack response will arrive from the recipient.
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* If this timer expires sta_addba_resp_timer_expired will be executed.
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*/
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static void sta_addba_resp_timer_expired(unsigned long data)
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{
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/* not an elegant detour, but there is no choice as the timer passes
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* only one argument, and both sta_info and TID are needed, so init
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* flow in sta_info_create gives the TID as data, while the timer_to_id
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* array gives the sta through container_of */
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u16 tid = *(u8 *)data;
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struct sta_info *sta = container_of((void *)data,
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struct sta_info, timer_to_tid[tid]);
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struct tid_ampdu_tx *tid_tx;
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/* check if the TID waits for addBA response */
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rcu_read_lock();
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tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
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if (!tid_tx ||
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test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state)) {
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rcu_read_unlock();
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#ifdef CONFIG_MAC80211_HT_DEBUG
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printk(KERN_DEBUG "timer expired on tid %d but we are not "
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"(or no longer) expecting addBA response there\n",
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tid);
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#endif
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return;
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}
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#ifdef CONFIG_MAC80211_HT_DEBUG
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printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid);
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#endif
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ieee80211_stop_tx_ba_session(&sta->sta, tid);
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rcu_read_unlock();
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}
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static inline int ieee80211_ac_from_tid(int tid)
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{
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return ieee802_1d_to_ac[tid & 7];
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}
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/*
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* When multiple aggregation sessions on multiple stations
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* are being created/destroyed simultaneously, we need to
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* refcount the global queue stop caused by that in order
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* to not get into a situation where one of the aggregation
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* setup or teardown re-enables queues before the other is
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* ready to handle that.
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*
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* These two functions take care of this issue by keeping
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* a global "agg_queue_stop" refcount.
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*/
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static void __acquires(agg_queue)
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ieee80211_stop_queue_agg(struct ieee80211_local *local, int tid)
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{
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int queue = ieee80211_ac_from_tid(tid);
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if (atomic_inc_return(&local->agg_queue_stop[queue]) == 1)
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ieee80211_stop_queue_by_reason(
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&local->hw, queue,
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IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
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__acquire(agg_queue);
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}
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static void __releases(agg_queue)
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ieee80211_wake_queue_agg(struct ieee80211_local *local, int tid)
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{
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int queue = ieee80211_ac_from_tid(tid);
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if (atomic_dec_return(&local->agg_queue_stop[queue]) == 0)
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ieee80211_wake_queue_by_reason(
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&local->hw, queue,
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IEEE80211_QUEUE_STOP_REASON_AGGREGATION);
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__release(agg_queue);
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}
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void ieee80211_tx_ba_session_handle_start(struct sta_info *sta, int tid)
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{
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struct tid_ampdu_tx *tid_tx;
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struct ieee80211_local *local = sta->local;
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struct ieee80211_sub_if_data *sdata = sta->sdata;
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u16 start_seq_num;
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int ret;
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tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
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/*
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* While we're asking the driver about the aggregation,
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* stop the AC queue so that we don't have to worry
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* about frames that came in while we were doing that,
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* which would require us to put them to the AC pending
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* afterwards which just makes the code more complex.
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*/
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ieee80211_stop_queue_agg(local, tid);
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clear_bit(HT_AGG_STATE_WANT_START, &tid_tx->state);
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/*
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* make sure no packets are being processed to get
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* valid starting sequence number
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*/
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synchronize_net();
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start_seq_num = sta->tid_seq[tid] >> 4;
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ret = drv_ampdu_action(local, sdata, IEEE80211_AMPDU_TX_START,
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&sta->sta, tid, &start_seq_num, 0);
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if (ret) {
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#ifdef CONFIG_MAC80211_HT_DEBUG
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printk(KERN_DEBUG "BA request denied - HW unavailable for"
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" tid %d\n", tid);
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#endif
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spin_lock_bh(&sta->lock);
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ieee80211_assign_tid_tx(sta, tid, NULL);
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spin_unlock_bh(&sta->lock);
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ieee80211_wake_queue_agg(local, tid);
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kfree_rcu(tid_tx, rcu_head);
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return;
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}
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/* we can take packets again now */
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ieee80211_wake_queue_agg(local, tid);
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/* activate the timer for the recipient's addBA response */
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mod_timer(&tid_tx->addba_resp_timer, jiffies + ADDBA_RESP_INTERVAL);
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#ifdef CONFIG_MAC80211_HT_DEBUG
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printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid);
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#endif
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spin_lock_bh(&sta->lock);
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sta->ampdu_mlme.addba_req_num[tid]++;
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spin_unlock_bh(&sta->lock);
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/* send AddBA request */
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ieee80211_send_addba_request(sdata, sta->sta.addr, tid,
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tid_tx->dialog_token, start_seq_num,
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local->hw.max_tx_aggregation_subframes,
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tid_tx->timeout);
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}
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int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid,
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u16 timeout)
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{
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struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
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struct ieee80211_sub_if_data *sdata = sta->sdata;
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struct ieee80211_local *local = sdata->local;
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struct tid_ampdu_tx *tid_tx;
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int ret = 0;
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trace_api_start_tx_ba_session(pubsta, tid);
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if (WARN_ON(!local->ops->ampdu_action))
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return -EINVAL;
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if ((tid >= STA_TID_NUM) ||
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!(local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) ||
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(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW))
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return -EINVAL;
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#ifdef CONFIG_MAC80211_HT_DEBUG
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printk(KERN_DEBUG "Open BA session requested for %pM tid %u\n",
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pubsta->addr, tid);
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#endif /* CONFIG_MAC80211_HT_DEBUG */
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/*
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* The aggregation code is not prepared to handle
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* anything but STA/AP due to the BSSID handling.
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* IBSS could work in the code but isn't supported
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* by drivers or the standard.
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*/
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if (sdata->vif.type != NL80211_IFTYPE_STATION &&
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sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
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sdata->vif.type != NL80211_IFTYPE_AP)
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return -EINVAL;
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if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) {
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#ifdef CONFIG_MAC80211_HT_DEBUG
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printk(KERN_DEBUG "BA sessions blocked. "
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"Denying BA session request\n");
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#endif
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return -EINVAL;
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}
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spin_lock_bh(&sta->lock);
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/* we have tried too many times, receiver does not want A-MPDU */
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if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) {
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ret = -EBUSY;
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goto err_unlock_sta;
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}
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tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
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/* check if the TID is not in aggregation flow already */
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if (tid_tx || sta->ampdu_mlme.tid_start_tx[tid]) {
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#ifdef CONFIG_MAC80211_HT_DEBUG
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printk(KERN_DEBUG "BA request denied - session is not "
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"idle on tid %u\n", tid);
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#endif /* CONFIG_MAC80211_HT_DEBUG */
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ret = -EAGAIN;
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goto err_unlock_sta;
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}
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/* prepare A-MPDU MLME for Tx aggregation */
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tid_tx = kzalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
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if (!tid_tx) {
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ret = -ENOMEM;
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goto err_unlock_sta;
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}
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skb_queue_head_init(&tid_tx->pending);
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__set_bit(HT_AGG_STATE_WANT_START, &tid_tx->state);
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tid_tx->timeout = timeout;
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/* Tx timer */
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tid_tx->addba_resp_timer.function = sta_addba_resp_timer_expired;
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tid_tx->addba_resp_timer.data = (unsigned long)&sta->timer_to_tid[tid];
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init_timer(&tid_tx->addba_resp_timer);
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/* assign a dialog token */
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sta->ampdu_mlme.dialog_token_allocator++;
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tid_tx->dialog_token = sta->ampdu_mlme.dialog_token_allocator;
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/*
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* Finally, assign it to the start array; the work item will
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* collect it and move it to the normal array.
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*/
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sta->ampdu_mlme.tid_start_tx[tid] = tid_tx;
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ieee80211_queue_work(&local->hw, &sta->ampdu_mlme.work);
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/* this flow continues off the work */
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err_unlock_sta:
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spin_unlock_bh(&sta->lock);
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return ret;
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}
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EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
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/*
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* splice packets from the STA's pending to the local pending,
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* requires a call to ieee80211_agg_splice_finish later
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*/
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static void __acquires(agg_queue)
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ieee80211_agg_splice_packets(struct ieee80211_local *local,
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struct tid_ampdu_tx *tid_tx, u16 tid)
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{
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int queue = ieee80211_ac_from_tid(tid);
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unsigned long flags;
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|
ieee80211_stop_queue_agg(local, 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_local *local, u16 tid)
|
|
{
|
|
ieee80211_wake_queue_agg(local, tid);
|
|
}
|
|
|
|
static void ieee80211_agg_tx_operational(struct ieee80211_local *local,
|
|
struct sta_info *sta, u16 tid)
|
|
{
|
|
struct tid_ampdu_tx *tid_tx;
|
|
|
|
lockdep_assert_held(&sta->ampdu_mlme.mtx);
|
|
|
|
tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
|
|
|
|
#ifdef CONFIG_MAC80211_HT_DEBUG
|
|
printk(KERN_DEBUG "Aggregation is on for tid %d\n", tid);
|
|
#endif
|
|
|
|
drv_ampdu_action(local, sta->sdata,
|
|
IEEE80211_AMPDU_TX_OPERATIONAL,
|
|
&sta->sta, tid, NULL, tid_tx->buf_size);
|
|
|
|
/*
|
|
* 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(local, 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(local, tid);
|
|
|
|
spin_unlock_bh(&sta->lock);
|
|
}
|
|
|
|
void ieee80211_start_tx_ba_cb(struct ieee80211_vif *vif, 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);
|
|
|
|
if (tid >= STA_TID_NUM) {
|
|
#ifdef CONFIG_MAC80211_HT_DEBUG
|
|
printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
|
|
tid, STA_TID_NUM);
|
|
#endif
|
|
return;
|
|
}
|
|
|
|
mutex_lock(&local->sta_mtx);
|
|
sta = sta_info_get(sdata, ra);
|
|
if (!sta) {
|
|
mutex_unlock(&local->sta_mtx);
|
|
#ifdef CONFIG_MAC80211_HT_DEBUG
|
|
printk(KERN_DEBUG "Could not find station: %pM\n", ra);
|
|
#endif
|
|
return;
|
|
}
|
|
|
|
mutex_lock(&sta->ampdu_mlme.mtx);
|
|
tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
|
|
|
|
if (WARN_ON(!tid_tx)) {
|
|
#ifdef CONFIG_MAC80211_HT_DEBUG
|
|
printk(KERN_DEBUG "addBA was not requested!\n");
|
|
#endif
|
|
goto unlock;
|
|
}
|
|
|
|
if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state)))
|
|
goto unlock;
|
|
|
|
if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state))
|
|
ieee80211_agg_tx_operational(local, sta, tid);
|
|
|
|
unlock:
|
|
mutex_unlock(&sta->ampdu_mlme.mtx);
|
|
mutex_unlock(&local->sta_mtx);
|
|
}
|
|
|
|
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 ieee80211_ra_tid *ra_tid;
|
|
struct sk_buff *skb = dev_alloc_skb(0);
|
|
|
|
if (unlikely(!skb))
|
|
return;
|
|
|
|
ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
|
|
memcpy(&ra_tid->ra, ra, ETH_ALEN);
|
|
ra_tid->tid = tid;
|
|
|
|
skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_START;
|
|
skb_queue_tail(&sdata->skb_queue, skb);
|
|
ieee80211_queue_work(&local->hw, &sdata->work);
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
|
|
|
|
int __ieee80211_stop_tx_ba_session(struct sta_info *sta, u16 tid,
|
|
enum ieee80211_back_parties initiator,
|
|
bool tx)
|
|
{
|
|
int ret;
|
|
|
|
mutex_lock(&sta->ampdu_mlme.mtx);
|
|
|
|
ret = ___ieee80211_stop_tx_ba_session(sta, tid, initiator, tx);
|
|
|
|
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 >= STA_TID_NUM)
|
|
return -EINVAL;
|
|
|
|
spin_lock_bh(&sta->lock);
|
|
tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
|
|
|
|
if (!tid_tx) {
|
|
ret = -ENOENT;
|
|
goto unlock;
|
|
}
|
|
|
|
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 ieee80211_vif *vif, u8 *ra, u8 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);
|
|
|
|
if (tid >= STA_TID_NUM) {
|
|
#ifdef CONFIG_MAC80211_HT_DEBUG
|
|
printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
|
|
tid, STA_TID_NUM);
|
|
#endif
|
|
return;
|
|
}
|
|
|
|
#ifdef CONFIG_MAC80211_HT_DEBUG
|
|
printk(KERN_DEBUG "Stopping Tx BA session for %pM tid %d\n",
|
|
ra, tid);
|
|
#endif /* CONFIG_MAC80211_HT_DEBUG */
|
|
|
|
mutex_lock(&local->sta_mtx);
|
|
|
|
sta = sta_info_get(sdata, ra);
|
|
if (!sta) {
|
|
#ifdef CONFIG_MAC80211_HT_DEBUG
|
|
printk(KERN_DEBUG "Could not find station: %pM\n", ra);
|
|
#endif
|
|
goto unlock;
|
|
}
|
|
|
|
mutex_lock(&sta->ampdu_mlme.mtx);
|
|
spin_lock_bh(&sta->lock);
|
|
tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
|
|
|
|
if (!tid_tx || !test_bit(HT_AGG_STATE_STOPPING, &tid_tx->state)) {
|
|
#ifdef CONFIG_MAC80211_HT_DEBUG
|
|
printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n");
|
|
#endif
|
|
goto unlock_sta;
|
|
}
|
|
|
|
if (tid_tx->stop_initiator == WLAN_BACK_INITIATOR && tid_tx->tx_stop)
|
|
ieee80211_send_delba(sta->sdata, ra, tid,
|
|
WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
|
|
|
|
/*
|
|
* 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(local, 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(local, tid);
|
|
|
|
kfree_rcu(tid_tx, rcu_head);
|
|
|
|
unlock_sta:
|
|
spin_unlock_bh(&sta->lock);
|
|
mutex_unlock(&sta->ampdu_mlme.mtx);
|
|
unlock:
|
|
mutex_unlock(&local->sta_mtx);
|
|
}
|
|
|
|
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 ieee80211_ra_tid *ra_tid;
|
|
struct sk_buff *skb = dev_alloc_skb(0);
|
|
|
|
if (unlikely(!skb))
|
|
return;
|
|
|
|
ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
|
|
memcpy(&ra_tid->ra, ra, ETH_ALEN);
|
|
ra_tid->tid = tid;
|
|
|
|
skb->pkt_type = IEEE80211_SDATA_QUEUE_AGG_STOP;
|
|
skb_queue_tail(&sdata->skb_queue, skb);
|
|
ieee80211_queue_work(&local->hw, &sdata->work);
|
|
}
|
|
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;
|
|
u16 capab, tid;
|
|
u8 buf_size;
|
|
|
|
capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab);
|
|
tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
|
|
buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;
|
|
|
|
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) {
|
|
#ifdef CONFIG_MAC80211_HT_DEBUG
|
|
printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid);
|
|
#endif
|
|
goto out;
|
|
}
|
|
|
|
del_timer(&tid_tx->addba_resp_timer);
|
|
|
|
#ifdef CONFIG_MAC80211_HT_DEBUG
|
|
printk(KERN_DEBUG "switched off addBA timer for tid %d\n", tid);
|
|
#endif
|
|
/*
|
|
* 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;
|
|
|
|
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;
|
|
} else {
|
|
___ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR,
|
|
true);
|
|
}
|
|
|
|
out:
|
|
mutex_unlock(&sta->ampdu_mlme.mtx);
|
|
}
|