a6a67db2bc
mac80211 currently maintains the ampdu_lock to avoid starting a queue due to one aggregation session while another aggregation session needs the queue stopped. We can do better, however, and instead refcount the queue stops for this particular purpose, thus removing the need for the lock. This will help making ampdu_action able to sleep. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
716 lines
20 KiB
C
716 lines
20 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 2007-2009, 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 <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 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 as well as, if present, the @ampdu_queues
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* hardware parameter to the number of hardware AMPDU queues. If there are no
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* hardware queues then the driver will (currently) have to do all frame
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* buffering.
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*
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* When TX aggregation is started by some subsystem (usually the rate control
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* algorithm would be appropriate) by calling the
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* ieee80211_start_tx_ba_session() function, the driver will be notified via
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* its @ampdu_action function, with the %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() (or ieee80211_start_tx_ba_cb_irqsafe())
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* function, which will start the aggregation session.
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*
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* Similarly, when the aggregation session is stopped by
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* ieee80211_stop_tx_ba_session(), the driver's @ampdu_action function will
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* be called with the action %IEEE80211_AMPDU_TX_STOP. In this case, the
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* call must not fail, and the driver must later call ieee80211_stop_tx_ba_cb()
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* (or 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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printk(KERN_ERR "%s: failed to allocate buffer "
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"for addba request frame\n", sdata->name);
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return;
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}
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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_sub_if_data *sdata, u8 *ra, u16 tid, u16 ssn)
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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_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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printk(KERN_ERR "%s: failed to allocate buffer for "
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"bar frame\n", sdata->name);
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return;
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}
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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 << 12);
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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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static void kfree_tid_tx(struct rcu_head *rcu_head)
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{
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struct tid_ampdu_tx *tid_tx =
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container_of(rcu_head, struct tid_ampdu_tx, rcu_head);
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kfree(tid_tx);
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}
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static int ___ieee80211_stop_tx_ba_session(
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struct sta_info *sta, u16 tid,
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enum ieee80211_back_parties initiator)
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{
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struct ieee80211_local *local = sta->local;
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struct tid_ampdu_tx *tid_tx = sta->ampdu_mlme.tid_tx[tid];
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int ret;
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lockdep_assert_held(&sta->lock);
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if (WARN_ON(!tid_tx))
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return -ENOENT;
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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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/*
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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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ret = drv_ampdu_action(local, sta->sdata,
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IEEE80211_AMPDU_TX_STOP,
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&sta->sta, tid, NULL);
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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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spin_lock_bh(&sta->lock);
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tid_tx = 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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spin_unlock_bh(&sta->lock);
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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, tid, WLAN_BACK_INITIATOR);
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spin_unlock_bh(&sta->lock);
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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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int ieee80211_start_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid)
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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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u16 start_seq_num;
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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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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_flags(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 = sta->ampdu_mlme.tid_tx[tid];
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/* check if the TID is not in aggregation flow already */
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if (tid_tx) {
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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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/*
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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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/* 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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#ifdef CONFIG_MAC80211_HT_DEBUG
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if (net_ratelimit())
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printk(KERN_ERR "allocate tx mlme to tid %d failed\n",
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tid);
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#endif
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ret = -ENOMEM;
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goto err_wake_queue;
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}
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skb_queue_head_init(&tid_tx->pending);
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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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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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pubsta, tid, &start_seq_num);
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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 /* CONFIG_MAC80211_HT_DEBUG */
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goto err_free;
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}
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rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], tid_tx);
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/* Driver vetoed or OKed, but 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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tid_tx->addba_resp_timer.expires = jiffies + ADDBA_RESP_INTERVAL;
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add_timer(&tid_tx->addba_resp_timer);
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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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/* prepare tid data */
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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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tid_tx->ssn = start_seq_num;
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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, pubsta->addr, tid,
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tid_tx->dialog_token, tid_tx->ssn,
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0x40, 5000);
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return 0;
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err_free:
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kfree(tid_tx);
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err_wake_queue:
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ieee80211_wake_queue_agg(local, tid);
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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);
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if (WARN(!tid_tx, "TID %d gone but expected when splicing aggregates"
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" from the pending queue\n", tid))
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return;
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if (!skb_queue_empty(&tid_tx->pending)) {
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spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
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/* copy over remaining packets */
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skb_queue_splice_tail_init(&tid_tx->pending,
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&local->pending[queue]);
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spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
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}
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}
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static void __releases(agg_queue)
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ieee80211_agg_splice_finish(struct ieee80211_local *local, u16 tid)
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{
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ieee80211_wake_queue_agg(local, tid);
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}
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/* caller must hold sta->lock */
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static void ieee80211_agg_tx_operational(struct ieee80211_local *local,
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struct sta_info *sta, u16 tid)
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{
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lockdep_assert_held(&sta->lock);
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#ifdef CONFIG_MAC80211_HT_DEBUG
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printk(KERN_DEBUG "Aggregation is on for tid %d\n", tid);
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#endif
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ieee80211_agg_splice_packets(local, sta->ampdu_mlme.tid_tx[tid], tid);
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/*
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* Now mark as operational. This will be visible
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* in the TX path, and lets it go lock-free in
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* the common case.
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*/
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set_bit(HT_AGG_STATE_OPERATIONAL, &sta->ampdu_mlme.tid_tx[tid]->state);
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ieee80211_agg_splice_finish(local, tid);
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drv_ampdu_action(local, sta->sdata,
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IEEE80211_AMPDU_TX_OPERATIONAL,
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&sta->sta, tid, NULL);
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}
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void ieee80211_start_tx_ba_cb(struct ieee80211_vif *vif, u8 *ra, u16 tid)
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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 sta_info *sta;
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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;
|
|
}
|
|
|
|
rcu_read_lock();
|
|
sta = sta_info_get(sdata, ra);
|
|
if (!sta) {
|
|
rcu_read_unlock();
|
|
#ifdef CONFIG_MAC80211_HT_DEBUG
|
|
printk(KERN_DEBUG "Could not find station: %pM\n", ra);
|
|
#endif
|
|
return;
|
|
}
|
|
|
|
spin_lock_bh(&sta->lock);
|
|
tid_tx = sta->ampdu_mlme.tid_tx[tid];
|
|
|
|
if (WARN_ON(!tid_tx)) {
|
|
#ifdef CONFIG_MAC80211_HT_DEBUG
|
|
printk(KERN_DEBUG "addBA was not requested!\n");
|
|
#endif
|
|
spin_unlock_bh(&sta->lock);
|
|
rcu_read_unlock();
|
|
return;
|
|
}
|
|
|
|
if (WARN_ON(test_and_set_bit(HT_AGG_STATE_DRV_READY, &tid_tx->state)))
|
|
goto out;
|
|
|
|
if (test_bit(HT_AGG_STATE_RESPONSE_RECEIVED, &tid_tx->state))
|
|
ieee80211_agg_tx_operational(local, sta, tid);
|
|
|
|
out:
|
|
spin_unlock_bh(&sta->lock);
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
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)) {
|
|
#ifdef CONFIG_MAC80211_HT_DEBUG
|
|
if (net_ratelimit())
|
|
printk(KERN_WARNING "%s: Not enough memory, "
|
|
"dropping start BA session", sdata->name);
|
|
#endif
|
|
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)
|
|
{
|
|
struct tid_ampdu_tx *tid_tx;
|
|
int ret;
|
|
|
|
spin_lock_bh(&sta->lock);
|
|
tid_tx = sta->ampdu_mlme.tid_tx[tid];
|
|
|
|
/* check if the TID is in aggregation */
|
|
if (!tid_tx || !test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
|
|
ret = -ENOENT;
|
|
goto unlock;
|
|
}
|
|
|
|
ret = ___ieee80211_stop_tx_ba_session(sta, tid, initiator);
|
|
|
|
unlock:
|
|
spin_unlock_bh(&sta->lock);
|
|
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;
|
|
|
|
trace_api_stop_tx_ba_session(pubsta, tid);
|
|
|
|
if (!local->ops->ampdu_action)
|
|
return -EINVAL;
|
|
|
|
if (tid >= STA_TID_NUM)
|
|
return -EINVAL;
|
|
|
|
return __ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_INITIATOR);
|
|
}
|
|
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 */
|
|
|
|
rcu_read_lock();
|
|
sta = sta_info_get(sdata, ra);
|
|
if (!sta) {
|
|
#ifdef CONFIG_MAC80211_HT_DEBUG
|
|
printk(KERN_DEBUG "Could not find station: %pM\n", ra);
|
|
#endif
|
|
rcu_read_unlock();
|
|
return;
|
|
}
|
|
|
|
spin_lock_bh(&sta->lock);
|
|
tid_tx = sta->ampdu_mlme.tid_tx[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
|
|
spin_unlock_bh(&sta->lock);
|
|
rcu_read_unlock();
|
|
return;
|
|
}
|
|
|
|
if (tid_tx->stop_initiator == WLAN_BACK_INITIATOR)
|
|
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 */
|
|
rcu_assign_pointer(sta->ampdu_mlme.tid_tx[tid], NULL);
|
|
|
|
ieee80211_agg_splice_finish(local, tid);
|
|
|
|
call_rcu(&tid_tx->rcu_head, kfree_tid_tx);
|
|
|
|
spin_unlock_bh(&sta->lock);
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
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)) {
|
|
#ifdef CONFIG_MAC80211_HT_DEBUG
|
|
if (net_ratelimit())
|
|
printk(KERN_WARNING "%s: Not enough memory, "
|
|
"dropping stop BA session", sdata->name);
|
|
#endif
|
|
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;
|
|
|
|
capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab);
|
|
tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
|
|
|
|
spin_lock_bh(&sta->lock);
|
|
|
|
tid_tx = sta->ampdu_mlme.tid_tx[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
|
|
|
|
if (le16_to_cpu(mgmt->u.action.u.addba_resp.status)
|
|
== WLAN_STATUS_SUCCESS) {
|
|
if (test_and_set_bit(HT_AGG_STATE_RESPONSE_RECEIVED,
|
|
&tid_tx->state)) {
|
|
/* ignore duplicate response */
|
|
goto out;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
out:
|
|
spin_unlock_bh(&sta->lock);
|
|
}
|