[deliverable/linux.git] / net / mac80211 / agg-rx.c

/*
 * HT handling
 *
 * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
 * Copyright 2002-2005, Instant802 Networks, Inc.
 * Copyright 2005-2006, Devicescape Software, Inc.
 * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
 * Copyright 2007-2010, Intel Corporation
 *
 * 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 <linux/export.h>
#include <net/mac80211.h>
#include "ieee80211_i.h"
#include "driver-ops.h"

static void ieee80211_free_tid_rx(struct rcu_head *h)
{
	struct tid_ampdu_rx *tid_rx =
		container_of(h, struct tid_ampdu_rx, rcu_head);
	int i;

	for (i = 0; i < tid_rx->buf_size; i++)
		__skb_queue_purge(&tid_rx->reorder_buf[i]);
	kfree(tid_rx->reorder_buf);
	kfree(tid_rx->reorder_time);
	kfree(tid_rx);
}

void ___ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid,
				     u16 initiator, u16 reason, bool tx)
{
	struct ieee80211_local *local = sta->local;
	struct tid_ampdu_rx *tid_rx;

	lockdep_assert_held(&sta->ampdu_mlme.mtx);

	tid_rx = rcu_dereference_protected(sta->ampdu_mlme.tid_rx[tid],
					lockdep_is_held(&sta->ampdu_mlme.mtx));

	if (!tid_rx)
		return;

	RCU_INIT_POINTER(sta->ampdu_mlme.tid_rx[tid], NULL);

	ht_dbg(sta->sdata,
	       "Rx BA session stop requested for %pM tid %u %s reason: %d\n",
	       sta->sta.addr, tid,
	       initiator == WLAN_BACK_RECIPIENT ? "recipient" : "inititator",
	       (int)reason);

	if (drv_ampdu_action(local, sta->sdata, IEEE80211_AMPDU_RX_STOP,
			     &sta->sta, tid, NULL, 0))
		sdata_info(sta->sdata,
			   "HW problem - can not stop rx aggregation for %pM tid %d\n",
			   sta->sta.addr, tid);

	/* check if this is a self generated aggregation halt */
	if (initiator == WLAN_BACK_RECIPIENT && tx)
		ieee80211_send_delba(sta->sdata, sta->sta.addr,
				     tid, WLAN_BACK_RECIPIENT, reason);

	del_timer_sync(&tid_rx->session_timer);

	/* make sure ieee80211_sta_reorder_release() doesn't re-arm the timer */
	spin_lock_bh(&tid_rx->reorder_lock);
	tid_rx->removed = true;
	spin_unlock_bh(&tid_rx->reorder_lock);
	del_timer_sync(&tid_rx->reorder_timer);

	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, bool tx)
{
	mutex_lock(&sta->ampdu_mlme.mtx);
	___ieee80211_stop_rx_ba_session(sta, tid, initiator, reason, tx);
	mutex_unlock(&sta->ampdu_mlme.mtx);
}

void ieee80211_stop_rx_ba_session(struct ieee80211_vif *vif, u16 ba_rx_bitmap,
				  const u8 *addr)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
	struct sta_info *sta;
	int i;

	rcu_read_lock();
	sta = sta_info_get_bss(sdata, addr);
	if (!sta) {
		rcu_read_unlock();
		return;
	}

	for (i = 0; i < IEEE80211_NUM_TIDS; i++)
		if (ba_rx_bitmap & BIT(i))
			set_bit(i, sta->ampdu_mlme.tid_rx_stop_requested);

	ieee80211_queue_work(&sta->local->hw, &sta->ampdu_mlme.work);
	rcu_read_unlock();
}
EXPORT_SYMBOL(ieee80211_stop_rx_ba_session);

/*
 * After accepting the AddBA Request we activated a timer,
 * resetting it after each frame that arrives from the originator.
 */
static void sta_rx_agg_session_timer_expired(unsigned long data)
{
	/* not an elegant detour, but there is no choice as the timer passes
	 * only one argument, and various sta_info are needed here, so init
	 * flow in sta_info_create gives the TID as data, while the timer_to_id
	 * array gives the sta through container_of */
	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]);
	struct tid_ampdu_rx *tid_rx;
	unsigned long timeout;

	rcu_read_lock();
	tid_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[*ptid]);
	if (!tid_rx) {
		rcu_read_unlock();
		return;
	}

	timeout = tid_rx->last_rx + TU_TO_JIFFIES(tid_rx->timeout);
	if (time_is_after_jiffies(timeout)) {
		mod_timer(&tid_rx->session_timer, timeout);
		rcu_read_unlock();
		return;
	}
	rcu_read_unlock();

	ht_dbg(sta->sdata, "RX session timer expired on %pM tid %d\n",
	       sta->sta.addr, (u16)*ptid);

	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();
	ieee80211_release_reorder_timeout(sta, *ptid);
	rcu_read_unlock();
}

static void ieee80211_send_addba_resp(struct ieee80211_sub_if_data *sdata, u8 *da, u16 tid,
				      u8 dialog_token, u16 status, u16 policy,
				      u16 buf_size, u16 timeout)
{
	struct ieee80211_local *local = sdata->local;
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
	u16 capab;

	skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
	if (!skb)
		return;

	skb_reserve(skb, local->hw.extra_tx_headroom);
	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
	memset(mgmt, 0, 24);
	memcpy(mgmt->da, da, ETH_ALEN);
	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
	if (sdata->vif.type == NL80211_IFTYPE_AP ||
	    sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
	    sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
		memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
	else if (sdata->vif.type == NL80211_IFTYPE_STATION)
		memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
	else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
		memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN);

	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
					  IEEE80211_STYPE_ACTION);

	skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp));
	mgmt->u.action.category = WLAN_CATEGORY_BACK;
	mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP;
	mgmt->u.action.u.addba_resp.dialog_token = dialog_token;

	capab = (u16)(policy << 1);	/* bit 1 aggregation policy */
	capab |= (u16)(tid << 2); 	/* bit 5:2 TID number */
	capab |= (u16)(buf_size << 6);	/* bit 15:6 max size of aggregation */

	mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab);
	mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout);
	mgmt->u.action.u.addba_resp.status = cpu_to_le16(status);

	ieee80211_tx_skb(sdata, skb);
}

void __ieee80211_start_rx_ba_session(struct sta_info *sta,
				     u8 dialog_token, u16 timeout,
				     u16 start_seq_num, u16 ba_policy, u16 tid,
				     u16 buf_size, bool tx, bool auto_seq)
{
	struct ieee80211_local *local = sta->sdata->local;
	struct tid_ampdu_rx *tid_agg_rx;
	int i, ret = -EOPNOTSUPP;
	u16 status = WLAN_STATUS_REQUEST_DECLINED;

	if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) {
		ht_dbg(sta->sdata,
		       "Suspend in progress - Denying ADDBA request (%pM tid %d)\n",
		       sta->sta.addr, tid);
		goto end_no_lock;
	}

	/* sanity check for incoming parameters:
	 * check if configuration can support the BA policy
	 * and if buffer size does not exceeds max value */
	/* XXX: check own ht delayed BA capability?? */
	if (((ba_policy != 1) &&
	     (!(sta->sta.ht_cap.cap & IEEE80211_HT_CAP_DELAY_BA))) ||
	    (buf_size > IEEE80211_MAX_AMPDU_BUF)) {
		status = WLAN_STATUS_INVALID_QOS_PARAM;
		ht_dbg_ratelimited(sta->sdata,
				   "AddBA Req with bad params from %pM on tid %u. policy %d, buffer size %d\n",
				   sta->sta.addr, tid, ba_policy, buf_size);
		goto end_no_lock;
	}
	/* determine default buffer size */
	if (buf_size == 0)
		buf_size = IEEE80211_MAX_AMPDU_BUF;

	/* make sure the size doesn't exceed the maximum supported by the hw */
	if (buf_size > local->hw.max_rx_aggregation_subframes)
		buf_size = local->hw.max_rx_aggregation_subframes;

	/* examine state machine */
	mutex_lock(&sta->ampdu_mlme.mtx);

	if (sta->ampdu_mlme.tid_rx[tid]) {
		ht_dbg_ratelimited(sta->sdata,
				   "unexpected AddBA Req from %pM on tid %u\n",
				   sta->sta.addr, tid);

		/* delete existing Rx BA session on the same tid */
		___ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_RECIPIENT,
						WLAN_STATUS_UNSPECIFIED_QOS,
						false);
	}

	/* prepare A-MPDU MLME for Rx aggregation */
	tid_agg_rx = kmalloc(sizeof(struct tid_ampdu_rx), GFP_KERNEL);
	if (!tid_agg_rx)
		goto end;

	spin_lock_init(&tid_agg_rx->reorder_lock);

	/* rx 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_deferrable(&tid_agg_rx->session_timer);

	/* 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 =
		kcalloc(buf_size, sizeof(struct sk_buff_head), GFP_KERNEL);
	tid_agg_rx->reorder_time =
		kcalloc(buf_size, sizeof(unsigned long), GFP_KERNEL);
	if (!tid_agg_rx->reorder_buf || !tid_agg_rx->reorder_time) {
		kfree(tid_agg_rx->reorder_buf);
		kfree(tid_agg_rx->reorder_time);
		kfree(tid_agg_rx);
		goto end;
	}

	for (i = 0; i < buf_size; i++)
		__skb_queue_head_init(&tid_agg_rx->reorder_buf[i]);

	ret = drv_ampdu_action(local, sta->sdata, IEEE80211_AMPDU_RX_START,
			       &sta->sta, tid, &start_seq_num, 0);
	ht_dbg(sta->sdata, "Rx A-MPDU request on %pM tid %d result %d\n",
	       sta->sta.addr, tid, ret);
	if (ret) {
		kfree(tid_agg_rx->reorder_buf);
		kfree(tid_agg_rx->reorder_time);
		kfree(tid_agg_rx);
		goto end;
	}

	/* 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->buf_size = buf_size;
	tid_agg_rx->timeout = timeout;
	tid_agg_rx->stored_mpdu_num = 0;
	tid_agg_rx->auto_seq = auto_seq;
	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));
		tid_agg_rx->last_rx = jiffies;
	}

end:
	mutex_unlock(&sta->ampdu_mlme.mtx);

end_no_lock:
	if (tx)
		ieee80211_send_addba_resp(sta->sdata, sta->sta.addr, tid,
					  dialog_token, status, 1, buf_size,
					  timeout);
}

void ieee80211_process_addba_request(struct ieee80211_local *local,
				     struct sta_info *sta,
				     struct ieee80211_mgmt *mgmt,
				     size_t len)
{
	u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num;
	u8 dialog_token;

	/* extract session parameters from addba request frame */
	dialog_token = mgmt->u.action.u.addba_req.dialog_token;
	timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout);
	start_seq_num =
		le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4;

	capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab);
	ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1;
	tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
	buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;

	__ieee80211_start_rx_ba_session(sta, dialog_token, timeout,
					start_seq_num, ba_policy, tid,
					buf_size, true, false);
}

void ieee80211_start_rx_ba_session_offl(struct ieee80211_vif *vif,
					const u8 *addr, u16 tid)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_rx_agg *rx_agg;
	struct sk_buff *skb = dev_alloc_skb(0);

	if (unlikely(!skb))
		return;

	rx_agg = (struct ieee80211_rx_agg *) &skb->cb;
	memcpy(&rx_agg->addr, addr, ETH_ALEN);
	rx_agg->tid = tid;

	skb->pkt_type = IEEE80211_SDATA_QUEUE_RX_AGG_START;
	skb_queue_tail(&sdata->skb_queue, skb);
	ieee80211_queue_work(&local->hw, &sdata->work);
}
EXPORT_SYMBOL(ieee80211_start_rx_ba_session_offl);

void ieee80211_stop_rx_ba_session_offl(struct ieee80211_vif *vif,
				       const u8 *addr, u16 tid)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_rx_agg *rx_agg;
	struct sk_buff *skb = dev_alloc_skb(0);

	if (unlikely(!skb))
		return;

	rx_agg = (struct ieee80211_rx_agg *) &skb->cb;
	memcpy(&rx_agg->addr, addr, ETH_ALEN);
	rx_agg->tid = tid;

	skb->pkt_type = IEEE80211_SDATA_QUEUE_RX_AGG_STOP;
	skb_queue_tail(&sdata->skb_queue, skb);
	ieee80211_queue_work(&local->hw, &sdata->work);
}
EXPORT_SYMBOL(ieee80211_stop_rx_ba_session_offl);
Commit	Line	Data
b8695a8f JB	1	/*
	2	* HT handling
	3	*
	4	* Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
	5	* Copyright 2002-2005, Instant802 Networks, Inc.
	6	* Copyright 2005-2006, Devicescape Software, Inc.
	7	* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
	8	* Copyright 2007, Michael Wu <flamingice@sourmilk.net>
a93e3644	9	* Copyright 2007-2010, Intel Corporation
b8695a8f JB	10	*
	11	* This program is free software; you can redistribute it and/or modify
	12	* it under the terms of the GNU General Public License version 2 as
	13	* published by the Free Software Foundation.
	14	*/
	15
73a72a81 JB	16	/**
	17	* DOC: RX A-MPDU aggregation
	18	*
	19	* Aggregation on the RX side requires only implementing the
	20	* @ampdu_action callback that is invoked to start/stop any
	21	* block-ack sessions for RX aggregation.
	22	*
	23	* When RX aggregation is started by the peer, the driver is
	24	* notified via @ampdu_action function, with the
	25	* %IEEE80211_AMPDU_RX_START action, and may reject the request
	26	* in which case a negative response is sent to the peer, if it
	27	* accepts it a positive response is sent.
	28	*
	29	* While the session is active, the device/driver are required
	30	* to de-aggregate frames and pass them up one by one to mac80211,
	31	* which will handle the reorder buffer.
	32	*
	33	* When the aggregation session is stopped again by the peer or
	34	* ourselves, the driver's @ampdu_action function will be called
	35	* with the action %IEEE80211_AMPDU_RX_STOP. In this case, the
	36	* call must not fail.
	37	*/
	38
b8695a8f	39	#include <linux/ieee80211.h>
5a0e3ad6	40	#include <linux/slab.h>
bc3b2d7f	41	#include <linux/export.h>
b8695a8f JB	42	#include <net/mac80211.h>
b8695a8f JB	43	#include "ieee80211_i.h"
24487981	44	#include "driver-ops.h"
b8695a8f	45
a87f736d JB	46	static void ieee80211_free_tid_rx(struct rcu_head *h)
	47	{
	48	struct tid_ampdu_rx *tid_rx =
	49	container_of(h, struct tid_ampdu_rx, rcu_head);
	50	int i;
	51
	52	for (i = 0; i < tid_rx->buf_size; i++)
83eb935e	53	__skb_queue_purge(&tid_rx->reorder_buf[i]);
a87f736d JB	54	kfree(tid_rx->reorder_buf);
	55	kfree(tid_rx->reorder_time);
	56	kfree(tid_rx);
	57	}
	58
7c3b1dd8	59	void ___ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid,
53f73c09	60	u16 initiator, u16 reason, bool tx)
b8695a8f	61	{
d75636ef	62	struct ieee80211_local *local = sta->local;
098a6070	63	struct tid_ampdu_rx *tid_rx;
b8695a8f	64
a93e3644	65	lockdep_assert_held(&sta->ampdu_mlme.mtx);
098a6070	66
40b275b6 JB	67	tid_rx = rcu_dereference_protected(sta->ampdu_mlme.tid_rx[tid],
40b275b6 JB	68	lockdep_is_held(&sta->ampdu_mlme.mtx));
a87f736d	69
7c3b1dd8	70	if (!tid_rx)
b8695a8f	71	return;
d75636ef	72
a9b3cd7f	73	RCU_INIT_POINTER(sta->ampdu_mlme.tid_rx[tid], NULL);
b8695a8f	74
bdcbd8e0 JB	75	ht_dbg(sta->sdata,
	76	"Rx BA session stop requested for %pM tid %u %s reason: %d\n",
	77	sta->sta.addr, tid,
	78	initiator == WLAN_BACK_RECIPIENT ? "recipient" : "inititator",
	79	(int)reason);
b8695a8f	80
12375ef9	81	if (drv_ampdu_action(local, sta->sdata, IEEE80211_AMPDU_RX_STOP,
0b01f030	82	&sta->sta, tid, NULL, 0))
bdcbd8e0	83	sdata_info(sta->sdata,
0a214d3f JB	84	"HW problem - can not stop rx aggregation for %pM tid %d\n",
0a214d3f JB	85	sta->sta.addr, tid);
b8695a8f	86
b8695a8f	87	/* check if this is a self generated aggregation halt */
53f73c09	88	if (initiator == WLAN_BACK_RECIPIENT && tx)
d75636ef	89	ieee80211_send_delba(sta->sdata, sta->sta.addr,
a7f39f60	90	tid, WLAN_BACK_RECIPIENT, reason);
b8695a8f	91
7c3b1dd8	92	del_timer_sync(&tid_rx->session_timer);
a87f736d	93
788211d8 JB	94	/* make sure ieee80211_sta_reorder_release() doesn't re-arm the timer */
	95	spin_lock_bh(&tid_rx->reorder_lock);
	96	tid_rx->removed = true;
	97	spin_unlock_bh(&tid_rx->reorder_lock);
	98	del_timer_sync(&tid_rx->reorder_timer);
	99
a87f736d	100	call_rcu(&tid_rx->rcu_head, ieee80211_free_tid_rx);
b8695a8f JB	101	}
b8695a8f JB	102
2aab4c27	103	void __ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid,
53f73c09	104	u16 initiator, u16 reason, bool tx)
2aab4c27	105	{
a93e3644	106	mutex_lock(&sta->ampdu_mlme.mtx);
53f73c09	107	___ieee80211_stop_rx_ba_session(sta, tid, initiator, reason, tx);
a93e3644	108	mutex_unlock(&sta->ampdu_mlme.mtx);
2aab4c27 JB	109	}
2aab4c27 JB	110
f41ccd71 SL	111	void ieee80211_stop_rx_ba_session(struct ieee80211_vif *vif, u16 ba_rx_bitmap,
	112	const u8 *addr)
	113	{
	114	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
0a557ed3	115	struct sta_info *sta;
f41ccd71 SL	116	int i;
f41ccd71 SL	117
0a557ed3	118	rcu_read_lock();
bc192f89	119	sta = sta_info_get_bss(sdata, addr);
0a557ed3 EP	120	if (!sta) {
	121	rcu_read_unlock();
	122	return;
	123	}
	124
5a306f58	125	for (i = 0; i < IEEE80211_NUM_TIDS; i++)
f41ccd71 SL	126	if (ba_rx_bitmap & BIT(i))
	127	set_bit(i, sta->ampdu_mlme.tid_rx_stop_requested);
	128
	129	ieee80211_queue_work(&sta->local->hw, &sta->ampdu_mlme.work);
0a557ed3	130	rcu_read_unlock();
f41ccd71 SL	131	}
	132	EXPORT_SYMBOL(ieee80211_stop_rx_ba_session);
	133
b8695a8f JB	134	/*
	135	* After accepting the AddBA Request we activated a timer,
	136	* resetting it after each frame that arrives from the originator.
b8695a8f JB	137	*/
	138	static void sta_rx_agg_session_timer_expired(unsigned long data)
	139	{
	140	/* not an elegant detour, but there is no choice as the timer passes
	141	* only one argument, and various sta_info are needed here, so init
	142	* flow in sta_info_create gives the TID as data, while the timer_to_id
	143	* array gives the sta through container_of */
	144	u8 ptid = (u8 )data;
	145	u8 timer_to_id = ptid - ptid;
	146	struct sta_info *sta = container_of(timer_to_id, struct sta_info,
	147	timer_to_tid[0]);
12d3952f FF	148	struct tid_ampdu_rx *tid_rx;
	149	unsigned long timeout;
	150
d8c7aae6	151	rcu_read_lock();
12d3952f	152	tid_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[*ptid]);
d8c7aae6 FF	153	if (!tid_rx) {
d8c7aae6 FF	154	rcu_read_unlock();
12d3952f	155	return;
d8c7aae6	156	}
12d3952f FF	157
	158	timeout = tid_rx->last_rx + TU_TO_JIFFIES(tid_rx->timeout);
	159	if (time_is_after_jiffies(timeout)) {
	160	mod_timer(&tid_rx->session_timer, timeout);
d8c7aae6	161	rcu_read_unlock();
12d3952f FF	162	return;
12d3952f FF	163	}
d8c7aae6	164	rcu_read_unlock();
b8695a8f	165
0a214d3f JB	166	ht_dbg(sta->sdata, "RX session timer expired on %pM tid %d\n",
0a214d3f JB	167	sta->sta.addr, (u16)*ptid);
d63e9ae3	168
7c3b1dd8 JB	169	set_bit(*ptid, sta->ampdu_mlme.tid_rx_timer_expired);
7c3b1dd8 JB	170	ieee80211_queue_work(&sta->local->hw, &sta->ampdu_mlme.work);
b8695a8f JB	171	}
b8695a8f JB	172
2bff8ebf CL	173	static void sta_rx_agg_reorder_timer_expired(unsigned long data)
	174	{
	175	u8 ptid = (u8 )data;
	176	u8 timer_to_id = ptid - ptid;
	177	struct sta_info *sta = container_of(timer_to_id, struct sta_info,
	178	timer_to_tid[0]);
	179
	180	rcu_read_lock();
2bff8ebf	181	ieee80211_release_reorder_timeout(sta, *ptid);
2bff8ebf CL	182	rcu_read_unlock();
	183	}
	184
b8695a8f JB	185	static void ieee80211_send_addba_resp(struct ieee80211_sub_if_data sdata, u8 da, u16 tid,
	186	u8 dialog_token, u16 status, u16 policy,
	187	u16 buf_size, u16 timeout)
	188	{
b8695a8f JB	189	struct ieee80211_local *local = sdata->local;
	190	struct sk_buff *skb;
	191	struct ieee80211_mgmt *mgmt;
	192	u16 capab;
	193
	194	skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
d15b8459	195	if (!skb)
b8695a8f	196	return;
b8695a8f JB	197
	198	skb_reserve(skb, local->hw.extra_tx_headroom);
	199	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
	200	memset(mgmt, 0, 24);
	201	memcpy(mgmt->da, da, ETH_ALEN);
47846c9b	202	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
8abd3f9b	203	if (sdata->vif.type == NL80211_IFTYPE_AP \|\|
ae2772b3 TP	204	sdata->vif.type == NL80211_IFTYPE_AP_VLAN \|\|
ae2772b3 TP	205	sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
47846c9b	206	memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
46900298 JB	207	else if (sdata->vif.type == NL80211_IFTYPE_STATION)
46900298 JB	208	memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
13c40c54 AS	209	else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
13c40c54 AS	210	memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN);
46900298	211
b8695a8f JB	212	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT \|
	213	IEEE80211_STYPE_ACTION);
	214
	215	skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp));
	216	mgmt->u.action.category = WLAN_CATEGORY_BACK;
	217	mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP;
	218	mgmt->u.action.u.addba_resp.dialog_token = dialog_token;
	219
	220	capab = (u16)(policy << 1); /* bit 1 aggregation policy */
	221	capab \|= (u16)(tid << 2); /* bit 5:2 TID number */
	222	capab \|= (u16)(buf_size << 6); /* bit 15:6 max size of aggregation */
	223
	224	mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab);
	225	mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout);
	226	mgmt->u.action.u.addba_resp.status = cpu_to_le16(status);
	227
62ae67be	228	ieee80211_tx_skb(sdata, skb);
b8695a8f JB	229	}
b8695a8f JB	230
08cf42e8 MK	231	void __ieee80211_start_rx_ba_session(struct sta_info *sta,
	232	u8 dialog_token, u16 timeout,
	233	u16 start_seq_num, u16 ba_policy, u16 tid,
4549cf2b	234	u16 buf_size, bool tx, bool auto_seq)
b8695a8f	235	{
08cf42e8	236	struct ieee80211_local *local = sta->sdata->local;
b8695a8f	237	struct tid_ampdu_rx *tid_agg_rx;
83eb935e	238	int i, ret = -EOPNOTSUPP;
08cf42e8	239	u16 status = WLAN_STATUS_REQUEST_DECLINED;
b8695a8f	240
c2c98fde	241	if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) {
0a214d3f JB	242	ht_dbg(sta->sdata,
	243	"Suspend in progress - Denying ADDBA request (%pM tid %d)\n",
	244	sta->sta.addr, tid);
722f069a S	245	goto end_no_lock;
	246	}
	247
b8695a8f JB	248	/* sanity check for incoming parameters:
	249	* check if configuration can support the BA policy
	250	* and if buffer size does not exceeds max value */
	251	/* XXX: check own ht delayed BA capability?? */
f64f9e71 JP	252	if (((ba_policy != 1) &&
	253	(!(sta->sta.ht_cap.cap & IEEE80211_HT_CAP_DELAY_BA))) \|\|
	254	(buf_size > IEEE80211_MAX_AMPDU_BUF)) {
b8695a8f	255	status = WLAN_STATUS_INVALID_QOS_PARAM;
bdcbd8e0 JB	256	ht_dbg_ratelimited(sta->sdata,
bdcbd8e0 JB	257	"AddBA Req with bad params from %pM on tid %u. policy %d, buffer size %d\n",
08cf42e8	258	sta->sta.addr, tid, ba_policy, buf_size);
b8695a8f JB	259	goto end_no_lock;
	260	}
	261	/* determine default buffer size */
82694f76 LC	262	if (buf_size == 0)
82694f76 LC	263	buf_size = IEEE80211_MAX_AMPDU_BUF;
b8695a8f	264
df6ba5d8 LC	265	/* make sure the size doesn't exceed the maximum supported by the hw */
	266	if (buf_size > local->hw.max_rx_aggregation_subframes)
	267	buf_size = local->hw.max_rx_aggregation_subframes;
b8695a8f JB	268
b8695a8f JB	269	/* examine state machine */
a93e3644	270	mutex_lock(&sta->ampdu_mlme.mtx);
b8695a8f	271
a87f736d	272	if (sta->ampdu_mlme.tid_rx[tid]) {
bdcbd8e0 JB	273	ht_dbg_ratelimited(sta->sdata,
bdcbd8e0 JB	274	"unexpected AddBA Req from %pM on tid %u\n",
08cf42e8	275	sta->sta.addr, tid);
15b4d843 AN	276
	277	/* delete existing Rx BA session on the same tid */
	278	___ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_RECIPIENT,
	279	WLAN_STATUS_UNSPECIFIED_QOS,
	280	false);
b8695a8f JB	281	}
	282
	283	/* prepare A-MPDU MLME for Rx aggregation */
dd318575	284	tid_agg_rx = kmalloc(sizeof(struct tid_ampdu_rx), GFP_KERNEL);
d15b8459	285	if (!tid_agg_rx)
b8695a8f	286	goto end;
b8695a8f	287
2bff8ebf CL	288	spin_lock_init(&tid_agg_rx->reorder_lock);
2bff8ebf CL	289
a87f736d JB	290	/* rx timer */
	291	tid_agg_rx->session_timer.function = sta_rx_agg_session_timer_expired;
	292	tid_agg_rx->session_timer.data = (unsigned long)&sta->timer_to_tid[tid];
12d3952f	293	init_timer_deferrable(&tid_agg_rx->session_timer);
b8695a8f	294
2bff8ebf CL	295	/* rx reorder timer */
	296	tid_agg_rx->reorder_timer.function = sta_rx_agg_reorder_timer_expired;
	297	tid_agg_rx->reorder_timer.data = (unsigned long)&sta->timer_to_tid[tid];
	298	init_timer(&tid_agg_rx->reorder_timer);
	299
b8695a8f JB	300	/* prepare reordering buffer */
b8695a8f JB	301	tid_agg_rx->reorder_buf =
83eb935e	302	kcalloc(buf_size, sizeof(struct sk_buff_head), GFP_KERNEL);
4d050f1d	303	tid_agg_rx->reorder_time =
dd318575	304	kcalloc(buf_size, sizeof(unsigned long), GFP_KERNEL);
4d050f1d	305	if (!tid_agg_rx->reorder_buf \|\| !tid_agg_rx->reorder_time) {
4d050f1d JM	306	kfree(tid_agg_rx->reorder_buf);
4d050f1d JM	307	kfree(tid_agg_rx->reorder_time);
a87f736d	308	kfree(tid_agg_rx);
b8695a8f JB	309	goto end;
	310	}
	311
83eb935e MK	312	for (i = 0; i < buf_size; i++)
	313	__skb_queue_head_init(&tid_agg_rx->reorder_buf[i]);
	314
12375ef9	315	ret = drv_ampdu_action(local, sta->sdata, IEEE80211_AMPDU_RX_START,
0b01f030	316	&sta->sta, tid, &start_seq_num, 0);
0a214d3f JB	317	ht_dbg(sta->sdata, "Rx A-MPDU request on %pM tid %d result %d\n",
0a214d3f JB	318	sta->sta.addr, tid, ret);
b8695a8f JB	319	if (ret) {
b8695a8f JB	320	kfree(tid_agg_rx->reorder_buf);
a87f736d	321	kfree(tid_agg_rx->reorder_time);
b8695a8f	322	kfree(tid_agg_rx);
b8695a8f JB	323	goto end;
	324	}
	325
a87f736d	326	/* update data */
b8695a8f JB	327	tid_agg_rx->dialog_token = dialog_token;
	328	tid_agg_rx->ssn = start_seq_num;
	329	tid_agg_rx->head_seq_num = start_seq_num;
	330	tid_agg_rx->buf_size = buf_size;
	331	tid_agg_rx->timeout = timeout;
	332	tid_agg_rx->stored_mpdu_num = 0;
4549cf2b	333	tid_agg_rx->auto_seq = auto_seq;
b8695a8f	334	status = WLAN_STATUS_SUCCESS;
a87f736d JB	335
a87f736d JB	336	/* activate it for RX */
cf778b00	337	rcu_assign_pointer(sta->ampdu_mlme.tid_rx[tid], tid_agg_rx);
f955ebb4	338
12d3952f	339	if (timeout) {
f955ebb4	340	mod_timer(&tid_agg_rx->session_timer, TU_TO_EXP_TIME(timeout));
12d3952f FF	341	tid_agg_rx->last_rx = jiffies;
12d3952f FF	342	}
f955ebb4	343
b8695a8f	344	end:
a93e3644	345	mutex_unlock(&sta->ampdu_mlme.mtx);
b8695a8f JB	346
b8695a8f JB	347	end_no_lock:
08cf42e8 MK	348	if (tx)
	349	ieee80211_send_addba_resp(sta->sdata, sta->sta.addr, tid,
	350	dialog_token, status, 1, buf_size,
	351	timeout);
	352	}
	353
	354	void ieee80211_process_addba_request(struct ieee80211_local *local,
	355	struct sta_info *sta,
	356	struct ieee80211_mgmt *mgmt,
	357	size_t len)
	358	{
	359	u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num;
	360	u8 dialog_token;
	361
	362	/* extract session parameters from addba request frame */
	363	dialog_token = mgmt->u.action.u.addba_req.dialog_token;
	364	timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout);
	365	start_seq_num =
	366	le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4;
	367
	368	capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab);
	369	ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1;
	370	tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
	371	buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;
	372
	373	__ieee80211_start_rx_ba_session(sta, dialog_token, timeout,
	374	start_seq_num, ba_policy, tid,
4549cf2b	375	buf_size, true, false);
08cf42e8 MK	376	}
	377
	378	void ieee80211_start_rx_ba_session_offl(struct ieee80211_vif *vif,
	379	const u8 *addr, u16 tid)
	380	{
	381	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
	382	struct ieee80211_local *local = sdata->local;
	383	struct ieee80211_rx_agg *rx_agg;
	384	struct sk_buff *skb = dev_alloc_skb(0);
	385
	386	if (unlikely(!skb))
	387	return;
	388
	389	rx_agg = (struct ieee80211_rx_agg *) &skb->cb;
	390	memcpy(&rx_agg->addr, addr, ETH_ALEN);
	391	rx_agg->tid = tid;
	392
	393	skb->pkt_type = IEEE80211_SDATA_QUEUE_RX_AGG_START;
	394	skb_queue_tail(&sdata->skb_queue, skb);
	395	ieee80211_queue_work(&local->hw, &sdata->work);
	396	}
	397	EXPORT_SYMBOL(ieee80211_start_rx_ba_session_offl);
	398
	399	void ieee80211_stop_rx_ba_session_offl(struct ieee80211_vif *vif,
	400	const u8 *addr, u16 tid)
	401	{
	402	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
	403	struct ieee80211_local *local = sdata->local;
	404	struct ieee80211_rx_agg *rx_agg;
	405	struct sk_buff *skb = dev_alloc_skb(0);
	406
	407	if (unlikely(!skb))
	408	return;
	409
	410	rx_agg = (struct ieee80211_rx_agg *) &skb->cb;
	411	memcpy(&rx_agg->addr, addr, ETH_ALEN);
	412	rx_agg->tid = tid;
	413
	414	skb->pkt_type = IEEE80211_SDATA_QUEUE_RX_AGG_STOP;
	415	skb_queue_tail(&sdata->skb_queue, skb);
	416	ieee80211_queue_work(&local->hw, &sdata->work);
b8695a8f	417	}
08cf42e8	418	EXPORT_SYMBOL(ieee80211_stop_rx_ba_session_offl);