* Copyright 2005-2006, Devicescape Software, Inc.
* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
* Copyright 2007, Michael Wu <flamingice@sourmilk.net>
- * Copyright 2007-2008, Intel Corporation
+ * Copyright 2007-2010, Intel Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
+/**
+ * DOC: RX A-MPDU aggregation
+ *
+ * Aggregation on the RX side requires only implementing the
+ * @ampdu_action callback that is invoked to start/stop any
+ * block-ack sessions for RX aggregation.
+ *
+ * When RX aggregation is started by the peer, the driver is
+ * notified via @ampdu_action function, with the
+ * %IEEE80211_AMPDU_RX_START action, and may reject the request
+ * in which case a negative response is sent to the peer, if it
+ * accepts it a positive response is sent.
+ *
+ * While the session is active, the device/driver are required
+ * to de-aggregate frames and pass them up one by one to mac80211,
+ * which will handle the reorder buffer.
+ *
+ * When the aggregation session is stopped again by the peer or
+ * ourselves, the driver's @ampdu_action function will be called
+ * with the action %IEEE80211_AMPDU_RX_STOP. In this case, the
+ * call must not fail.
+ */
+
#include <linux/ieee80211.h>
#include <linux/slab.h>
#include <net/mac80211.h>
#include "ieee80211_i.h"
#include "driver-ops.h"
-static void ___ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid,
- u16 initiator, u16 reason,
- bool from_timer)
+static void ieee80211_free_tid_rx(struct rcu_head *h)
{
- struct ieee80211_local *local = sta->local;
- struct tid_ampdu_rx *tid_rx;
+ struct tid_ampdu_rx *tid_rx =
+ container_of(h, struct tid_ampdu_rx, rcu_head);
int i;
- spin_lock_bh(&sta->lock);
+ for (i = 0; i < tid_rx->buf_size; i++)
+ dev_kfree_skb(tid_rx->reorder_buf[i]);
+ kfree(tid_rx->reorder_buf);
+ kfree(tid_rx->reorder_time);
+ kfree(tid_rx);
+}
- /* check if TID is in operational state */
- if (!sta->ampdu_mlme.tid_active_rx[tid]) {
- spin_unlock_bh(&sta->lock);
- return;
- }
+void ___ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid,
+ u16 initiator, u16 reason)
+{
+ struct ieee80211_local *local = sta->local;
+ struct tid_ampdu_rx *tid_rx;
- sta->ampdu_mlme.tid_active_rx[tid] = false;
+ lockdep_assert_held(&sta->ampdu_mlme.mtx);
tid_rx = sta->ampdu_mlme.tid_rx[tid];
+ if (!tid_rx)
+ return;
+
+ rcu_assign_pointer(sta->ampdu_mlme.tid_rx[tid], NULL);
+
#ifdef CONFIG_MAC80211_HT_DEBUG
printk(KERN_DEBUG "Rx BA session stop requested for %pM tid %u\n",
sta->sta.addr, tid);
ieee80211_send_delba(sta->sdata, sta->sta.addr,
tid, 0, reason);
- /* free the reordering buffer */
- for (i = 0; i < tid_rx->buf_size; i++) {
- if (tid_rx->reorder_buf[i]) {
- /* release the reordered frames */
- dev_kfree_skb(tid_rx->reorder_buf[i]);
- tid_rx->stored_mpdu_num--;
- tid_rx->reorder_buf[i] = NULL;
- }
- }
-
- /* free resources */
- kfree(tid_rx->reorder_buf);
- kfree(tid_rx->reorder_time);
- sta->ampdu_mlme.tid_rx[tid] = NULL;
-
- spin_unlock_bh(&sta->lock);
+ del_timer_sync(&tid_rx->session_timer);
+ del_timer_sync(&tid_rx->reorder_timer);
- if (!from_timer)
- del_timer_sync(&tid_rx->session_timer);
- kfree(tid_rx);
+ call_rcu(&tid_rx->rcu_head, ieee80211_free_tid_rx);
}
void __ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid,
u16 initiator, u16 reason)
{
- ___ieee80211_stop_rx_ba_session(sta, tid, initiator, reason, false);
+ mutex_lock(&sta->ampdu_mlme.mtx);
+ ___ieee80211_stop_rx_ba_session(sta, tid, initiator, reason);
+ mutex_unlock(&sta->ampdu_mlme.mtx);
}
/*
#ifdef CONFIG_MAC80211_HT_DEBUG
printk(KERN_DEBUG "rx session timer expired on tid %d\n", (u16)*ptid);
#endif
- ___ieee80211_stop_rx_ba_session(sta, *ptid, WLAN_BACK_RECIPIENT,
- WLAN_REASON_QSTA_TIMEOUT, true);
+ set_bit(*ptid, sta->ampdu_mlme.tid_rx_timer_expired);
+ ieee80211_queue_work(&sta->local->hw, &sta->ampdu_mlme.work);
+}
+
+static void sta_rx_agg_reorder_timer_expired(unsigned long data)
+{
+ u8 *ptid = (u8 *)data;
+ u8 *timer_to_id = ptid - *ptid;
+ struct sta_info *sta = container_of(timer_to_id, struct sta_info,
+ timer_to_tid[0]);
+
+ rcu_read_lock();
+ spin_lock(&sta->lock);
+ ieee80211_release_reorder_timeout(sta, *ptid);
+ spin_unlock(&sta->lock);
+ rcu_read_unlock();
}
static void ieee80211_send_addba_resp(struct ieee80211_sub_if_data *sdata, u8 *da, u16 tid,
/* examine state machine */
- spin_lock_bh(&sta->lock);
+ mutex_lock(&sta->ampdu_mlme.mtx);
- if (sta->ampdu_mlme.tid_active_rx[tid]) {
+ if (sta->ampdu_mlme.tid_rx[tid]) {
#ifdef CONFIG_MAC80211_HT_DEBUG
if (net_ratelimit())
printk(KERN_DEBUG "unexpected AddBA Req from "
}
/* prepare A-MPDU MLME for Rx aggregation */
- sta->ampdu_mlme.tid_rx[tid] =
- kmalloc(sizeof(struct tid_ampdu_rx), GFP_ATOMIC);
- if (!sta->ampdu_mlme.tid_rx[tid]) {
+ tid_agg_rx = kmalloc(sizeof(struct tid_ampdu_rx), GFP_ATOMIC);
+ if (!tid_agg_rx) {
#ifdef CONFIG_MAC80211_HT_DEBUG
if (net_ratelimit())
printk(KERN_ERR "allocate rx mlme to tid %d failed\n",
#endif
goto end;
}
+
+ spin_lock_init(&tid_agg_rx->reorder_lock);
+
/* rx timer */
- sta->ampdu_mlme.tid_rx[tid]->session_timer.function =
- sta_rx_agg_session_timer_expired;
- sta->ampdu_mlme.tid_rx[tid]->session_timer.data =
- (unsigned long)&sta->timer_to_tid[tid];
- init_timer(&sta->ampdu_mlme.tid_rx[tid]->session_timer);
+ tid_agg_rx->session_timer.function = sta_rx_agg_session_timer_expired;
+ tid_agg_rx->session_timer.data = (unsigned long)&sta->timer_to_tid[tid];
+ init_timer(&tid_agg_rx->session_timer);
- tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
+ /* rx reorder timer */
+ tid_agg_rx->reorder_timer.function = sta_rx_agg_reorder_timer_expired;
+ tid_agg_rx->reorder_timer.data = (unsigned long)&sta->timer_to_tid[tid];
+ init_timer(&tid_agg_rx->reorder_timer);
/* prepare reordering buffer */
tid_agg_rx->reorder_buf =
#endif
kfree(tid_agg_rx->reorder_buf);
kfree(tid_agg_rx->reorder_time);
- kfree(sta->ampdu_mlme.tid_rx[tid]);
- sta->ampdu_mlme.tid_rx[tid] = NULL;
+ kfree(tid_agg_rx);
goto end;
}
if (ret) {
kfree(tid_agg_rx->reorder_buf);
+ kfree(tid_agg_rx->reorder_time);
kfree(tid_agg_rx);
- sta->ampdu_mlme.tid_rx[tid] = NULL;
goto end;
}
- /* change state and send addba resp */
- sta->ampdu_mlme.tid_active_rx[tid] = true;
+ /* update data */
tid_agg_rx->dialog_token = dialog_token;
tid_agg_rx->ssn = start_seq_num;
tid_agg_rx->head_seq_num = start_seq_num;
tid_agg_rx->timeout = timeout;
tid_agg_rx->stored_mpdu_num = 0;
status = WLAN_STATUS_SUCCESS;
+
+ /* activate it for RX */
+ rcu_assign_pointer(sta->ampdu_mlme.tid_rx[tid], tid_agg_rx);
+
+ if (timeout)
+ mod_timer(&tid_agg_rx->session_timer, TU_TO_EXP_TIME(timeout));
+
end:
- spin_unlock_bh(&sta->lock);
+ mutex_unlock(&sta->ampdu_mlme.mtx);
end_no_lock:
ieee80211_send_addba_resp(sta->sdata, sta->sta.addr, tid,
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