[net-next-2.6.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 <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++)
		dev_kfree_skb(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 = 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);
#endif /* CONFIG_MAC80211_HT_DEBUG */

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

	del_timer_sync(&tid_rx->session_timer);
	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);
}

/*
 * 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]);

#ifdef CONFIG_MAC80211_HT_DEBUG
	printk(KERN_DEBUG "rx session timer expired on tid %d\n", (u16)*ptid);
#endif
	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,
				      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) {
		printk(KERN_DEBUG "%s: failed to allocate buffer "
		       "for addba resp frame\n", sdata->name);
		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)
		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);

	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_process_addba_request(struct ieee80211_local *local,
				     struct sta_info *sta,
				     struct ieee80211_mgmt *mgmt,
				     size_t len)
{
	struct ieee80211_hw *hw = &local->hw;
	struct ieee80211_conf *conf = &hw->conf;
	struct tid_ampdu_rx *tid_agg_rx;
	u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status;
	u8 dialog_token;
	int ret = -EOPNOTSUPP;

	/* 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;

	status = WLAN_STATUS_REQUEST_DECLINED;

	if (test_sta_flags(sta, WLAN_STA_BLOCK_BA)) {
#ifdef CONFIG_MAC80211_HT_DEBUG
		printk(KERN_DEBUG "Suspend in progress. "
		       "Denying ADDBA request\n");
#endif
		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;
#ifdef CONFIG_MAC80211_HT_DEBUG
		if (net_ratelimit())
			printk(KERN_DEBUG "AddBA Req with bad params from "
				"%pM on tid %u. policy %d, buffer size %d\n",
				mgmt->sa, tid, ba_policy,
				buf_size);
#endif /* CONFIG_MAC80211_HT_DEBUG */
		goto end_no_lock;
	}
	/* determine default buffer size */
	if (buf_size == 0) {
		struct ieee80211_supported_band *sband;

		sband = local->hw.wiphy->bands[conf->channel->band];
		buf_size = IEEE80211_MIN_AMPDU_BUF;
		buf_size = buf_size << sband->ht_cap.ampdu_factor;
	}


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

	if (sta->ampdu_mlme.tid_rx[tid]) {
#ifdef CONFIG_MAC80211_HT_DEBUG
		if (net_ratelimit())
			printk(KERN_DEBUG "unexpected AddBA Req from "
				"%pM on tid %u\n",
				mgmt->sa, tid);
#endif /* CONFIG_MAC80211_HT_DEBUG */
		goto end;
	}

	/* prepare A-MPDU MLME for Rx aggregation */
	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",
					tid);
#endif
		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(&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 *), GFP_ATOMIC);
	tid_agg_rx->reorder_time =
		kcalloc(buf_size, sizeof(unsigned long), GFP_ATOMIC);
	if (!tid_agg_rx->reorder_buf || !tid_agg_rx->reorder_time) {
#ifdef CONFIG_MAC80211_HT_DEBUG
		if (net_ratelimit())
			printk(KERN_ERR "can not allocate reordering buffer "
			       "to tid %d\n", tid);
#endif
		kfree(tid_agg_rx->reorder_buf);
		kfree(tid_agg_rx->reorder_time);
		kfree(tid_agg_rx);
		goto end;
	}

	ret = drv_ampdu_action(local, sta->sdata, IEEE80211_AMPDU_RX_START,
			       &sta->sta, tid, &start_seq_num);
#ifdef CONFIG_MAC80211_HT_DEBUG
	printk(KERN_DEBUG "Rx A-MPDU request on tid %d result %d\n", tid, ret);
#endif /* CONFIG_MAC80211_HT_DEBUG */

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

end_no_lock:
	ieee80211_send_addba_resp(sta->sdata, sta->sta.addr, tid,
				  dialog_token, status, 1, buf_size, timeout);
}
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>
b8695a8f JB	41	#include <net/mac80211.h>
b8695a8f JB	42	#include "ieee80211_i.h"
24487981	43	#include "driver-ops.h"
b8695a8f	44
a87f736d JB	45	static void ieee80211_free_tid_rx(struct rcu_head *h)
	46	{
	47	struct tid_ampdu_rx *tid_rx =
	48	container_of(h, struct tid_ampdu_rx, rcu_head);
	49	int i;
	50
	51	for (i = 0; i < tid_rx->buf_size; i++)
	52	dev_kfree_skb(tid_rx->reorder_buf[i]);
	53	kfree(tid_rx->reorder_buf);
	54	kfree(tid_rx->reorder_time);
	55	kfree(tid_rx);
	56	}
	57
7c3b1dd8	58	void ___ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid,
53f73c09	59	u16 initiator, u16 reason, bool tx)
b8695a8f	60	{
d75636ef	61	struct ieee80211_local *local = sta->local;
098a6070	62	struct tid_ampdu_rx *tid_rx;
b8695a8f	63
a93e3644	64	lockdep_assert_held(&sta->ampdu_mlme.mtx);
098a6070	65
a87f736d JB	66	tid_rx = sta->ampdu_mlme.tid_rx[tid];
a87f736d JB	67
7c3b1dd8	68	if (!tid_rx)
b8695a8f	69	return;
d75636ef	70
a87f736d	71	rcu_assign_pointer(sta->ampdu_mlme.tid_rx[tid], NULL);
b8695a8f	72
b8695a8f JB	73	#ifdef CONFIG_MAC80211_HT_DEBUG
b8695a8f JB	74	printk(KERN_DEBUG "Rx BA session stop requested for %pM tid %u\n",
d75636ef	75	sta->sta.addr, tid);
b8695a8f JB	76	#endif /* CONFIG_MAC80211_HT_DEBUG */
b8695a8f JB	77
12375ef9	78	if (drv_ampdu_action(local, sta->sdata, IEEE80211_AMPDU_RX_STOP,
24487981	79	&sta->sta, tid, NULL))
b8695a8f JB	80	printk(KERN_DEBUG "HW problem - can not stop rx "
	81	"aggregation for tid %d\n", tid);
	82
b8695a8f	83	/* check if this is a self generated aggregation halt */
53f73c09	84	if (initiator == WLAN_BACK_RECIPIENT && tx)
d75636ef JB	85	ieee80211_send_delba(sta->sdata, sta->sta.addr,
d75636ef JB	86	tid, 0, reason);
b8695a8f	87
7c3b1dd8	88	del_timer_sync(&tid_rx->session_timer);
2bff8ebf	89	del_timer_sync(&tid_rx->reorder_timer);
a87f736d JB	90
a87f736d JB	91	call_rcu(&tid_rx->rcu_head, ieee80211_free_tid_rx);
b8695a8f JB	92	}
b8695a8f JB	93
2aab4c27	94	void __ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid,
53f73c09	95	u16 initiator, u16 reason, bool tx)
2aab4c27	96	{
a93e3644	97	mutex_lock(&sta->ampdu_mlme.mtx);
53f73c09	98	___ieee80211_stop_rx_ba_session(sta, tid, initiator, reason, tx);
a93e3644	99	mutex_unlock(&sta->ampdu_mlme.mtx);
2aab4c27 JB	100	}
2aab4c27 JB	101
b8695a8f JB	102	/*
	103	* After accepting the AddBA Request we activated a timer,
	104	* resetting it after each frame that arrives from the originator.
b8695a8f JB	105	*/
	106	static void sta_rx_agg_session_timer_expired(unsigned long data)
	107	{
	108	/* not an elegant detour, but there is no choice as the timer passes
	109	* only one argument, and various sta_info are needed here, so init
	110	* flow in sta_info_create gives the TID as data, while the timer_to_id
	111	* array gives the sta through container_of */
	112	u8 ptid = (u8 )data;
	113	u8 timer_to_id = ptid - ptid;
	114	struct sta_info *sta = container_of(timer_to_id, struct sta_info,
	115	timer_to_tid[0]);
	116
	117	#ifdef CONFIG_MAC80211_HT_DEBUG
	118	printk(KERN_DEBUG "rx session timer expired on tid %d\n", (u16)*ptid);
	119	#endif
7c3b1dd8 JB	120	set_bit(*ptid, sta->ampdu_mlme.tid_rx_timer_expired);
7c3b1dd8 JB	121	ieee80211_queue_work(&sta->local->hw, &sta->ampdu_mlme.work);
b8695a8f JB	122	}
b8695a8f JB	123
2bff8ebf CL	124	static void sta_rx_agg_reorder_timer_expired(unsigned long data)
	125	{
	126	u8 ptid = (u8 )data;
	127	u8 timer_to_id = ptid - ptid;
	128	struct sta_info *sta = container_of(timer_to_id, struct sta_info,
	129	timer_to_tid[0]);
	130
	131	rcu_read_lock();
	132	spin_lock(&sta->lock);
	133	ieee80211_release_reorder_timeout(sta, *ptid);
	134	spin_unlock(&sta->lock);
	135	rcu_read_unlock();
	136	}
	137
b8695a8f JB	138	static void ieee80211_send_addba_resp(struct ieee80211_sub_if_data sdata, u8 da, u16 tid,
	139	u8 dialog_token, u16 status, u16 policy,
	140	u16 buf_size, u16 timeout)
	141	{
b8695a8f JB	142	struct ieee80211_local *local = sdata->local;
	143	struct sk_buff *skb;
	144	struct ieee80211_mgmt *mgmt;
	145	u16 capab;
	146
	147	skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
	148
	149	if (!skb) {
	150	printk(KERN_DEBUG "%s: failed to allocate buffer "
47846c9b	151	"for addba resp frame\n", sdata->name);
b8695a8f JB	152	return;
	153	}
	154
	155	skb_reserve(skb, local->hw.extra_tx_headroom);
	156	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
	157	memset(mgmt, 0, 24);
	158	memcpy(mgmt->da, da, ETH_ALEN);
47846c9b	159	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
8abd3f9b JB	160	if (sdata->vif.type == NL80211_IFTYPE_AP \|\|
8abd3f9b JB	161	sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
47846c9b	162	memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
46900298 JB	163	else if (sdata->vif.type == NL80211_IFTYPE_STATION)
	164	memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
	165
b8695a8f JB	166	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT \|
	167	IEEE80211_STYPE_ACTION);
	168
	169	skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp));
	170	mgmt->u.action.category = WLAN_CATEGORY_BACK;
	171	mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP;
	172	mgmt->u.action.u.addba_resp.dialog_token = dialog_token;
	173
	174	capab = (u16)(policy << 1); /* bit 1 aggregation policy */
	175	capab \|= (u16)(tid << 2); /* bit 5:2 TID number */
	176	capab \|= (u16)(buf_size << 6); /* bit 15:6 max size of aggregation */
	177
	178	mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab);
	179	mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout);
	180	mgmt->u.action.u.addba_resp.status = cpu_to_le16(status);
	181
62ae67be	182	ieee80211_tx_skb(sdata, skb);
b8695a8f JB	183	}
	184
	185	void ieee80211_process_addba_request(struct ieee80211_local *local,
	186	struct sta_info *sta,
	187	struct ieee80211_mgmt *mgmt,
	188	size_t len)
	189	{
	190	struct ieee80211_hw *hw = &local->hw;
	191	struct ieee80211_conf *conf = &hw->conf;
	192	struct tid_ampdu_rx *tid_agg_rx;
	193	u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status;
	194	u8 dialog_token;
	195	int ret = -EOPNOTSUPP;
	196
	197	/* extract session parameters from addba request frame */
	198	dialog_token = mgmt->u.action.u.addba_req.dialog_token;
	199	timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout);
	200	start_seq_num =
	201	le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4;
	202
	203	capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab);
	204	ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1;
	205	tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
	206	buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;
	207
	208	status = WLAN_STATUS_REQUEST_DECLINED;
	209
618f356b	210	if (test_sta_flags(sta, WLAN_STA_BLOCK_BA)) {
722f069a S	211	#ifdef CONFIG_MAC80211_HT_DEBUG
	212	printk(KERN_DEBUG "Suspend in progress. "
	213	"Denying ADDBA request\n");
	214	#endif
	215	goto end_no_lock;
	216	}
	217
b8695a8f JB	218	/* sanity check for incoming parameters:
	219	* check if configuration can support the BA policy
	220	* and if buffer size does not exceeds max value */
	221	/* XXX: check own ht delayed BA capability?? */
f64f9e71 JP	222	if (((ba_policy != 1) &&
	223	(!(sta->sta.ht_cap.cap & IEEE80211_HT_CAP_DELAY_BA))) \|\|
	224	(buf_size > IEEE80211_MAX_AMPDU_BUF)) {
b8695a8f JB	225	status = WLAN_STATUS_INVALID_QOS_PARAM;
	226	#ifdef CONFIG_MAC80211_HT_DEBUG
	227	if (net_ratelimit())
	228	printk(KERN_DEBUG "AddBA Req with bad params from "
	229	"%pM on tid %u. policy %d, buffer size %d\n",
	230	mgmt->sa, tid, ba_policy,
	231	buf_size);
	232	#endif /* CONFIG_MAC80211_HT_DEBUG */
	233	goto end_no_lock;
	234	}
	235	/* determine default buffer size */
	236	if (buf_size == 0) {
	237	struct ieee80211_supported_band *sband;
	238
	239	sband = local->hw.wiphy->bands[conf->channel->band];
	240	buf_size = IEEE80211_MIN_AMPDU_BUF;
	241	buf_size = buf_size << sband->ht_cap.ampdu_factor;
	242	}
	243
	244
	245	/* examine state machine */
a93e3644	246	mutex_lock(&sta->ampdu_mlme.mtx);
b8695a8f	247
a87f736d	248	if (sta->ampdu_mlme.tid_rx[tid]) {
b8695a8f JB	249	#ifdef CONFIG_MAC80211_HT_DEBUG
	250	if (net_ratelimit())
	251	printk(KERN_DEBUG "unexpected AddBA Req from "
	252	"%pM on tid %u\n",
	253	mgmt->sa, tid);
	254	#endif /* CONFIG_MAC80211_HT_DEBUG */
	255	goto end;
	256	}
	257
	258	/* prepare A-MPDU MLME for Rx aggregation */
a87f736d JB	259	tid_agg_rx = kmalloc(sizeof(struct tid_ampdu_rx), GFP_ATOMIC);
a87f736d JB	260	if (!tid_agg_rx) {
b8695a8f JB	261	#ifdef CONFIG_MAC80211_HT_DEBUG
	262	if (net_ratelimit())
	263	printk(KERN_ERR "allocate rx mlme to tid %d failed\n",
	264	tid);
	265	#endif
	266	goto end;
	267	}
b8695a8f	268
2bff8ebf CL	269	spin_lock_init(&tid_agg_rx->reorder_lock);
2bff8ebf CL	270
a87f736d JB	271	/* rx timer */
	272	tid_agg_rx->session_timer.function = sta_rx_agg_session_timer_expired;
	273	tid_agg_rx->session_timer.data = (unsigned long)&sta->timer_to_tid[tid];
	274	init_timer(&tid_agg_rx->session_timer);
b8695a8f	275
2bff8ebf CL	276	/* rx reorder timer */
	277	tid_agg_rx->reorder_timer.function = sta_rx_agg_reorder_timer_expired;
	278	tid_agg_rx->reorder_timer.data = (unsigned long)&sta->timer_to_tid[tid];
	279	init_timer(&tid_agg_rx->reorder_timer);
	280
b8695a8f JB	281	/* prepare reordering buffer */
	282	tid_agg_rx->reorder_buf =
	283	kcalloc(buf_size, sizeof(struct sk_buff *), GFP_ATOMIC);
4d050f1d JM	284	tid_agg_rx->reorder_time =
	285	kcalloc(buf_size, sizeof(unsigned long), GFP_ATOMIC);
	286	if (!tid_agg_rx->reorder_buf \|\| !tid_agg_rx->reorder_time) {
b8695a8f JB	287	#ifdef CONFIG_MAC80211_HT_DEBUG
	288	if (net_ratelimit())
	289	printk(KERN_ERR "can not allocate reordering buffer "
	290	"to tid %d\n", tid);
	291	#endif
4d050f1d JM	292	kfree(tid_agg_rx->reorder_buf);
4d050f1d JM	293	kfree(tid_agg_rx->reorder_time);
a87f736d	294	kfree(tid_agg_rx);
b8695a8f JB	295	goto end;
	296	}
	297
12375ef9	298	ret = drv_ampdu_action(local, sta->sdata, IEEE80211_AMPDU_RX_START,
24487981	299	&sta->sta, tid, &start_seq_num);
b8695a8f JB	300	#ifdef CONFIG_MAC80211_HT_DEBUG
	301	printk(KERN_DEBUG "Rx A-MPDU request on tid %d result %d\n", tid, ret);
	302	#endif /* CONFIG_MAC80211_HT_DEBUG */
	303
	304	if (ret) {
	305	kfree(tid_agg_rx->reorder_buf);
a87f736d	306	kfree(tid_agg_rx->reorder_time);
b8695a8f	307	kfree(tid_agg_rx);
b8695a8f JB	308	goto end;
	309	}
	310
a87f736d	311	/* update data */
b8695a8f JB	312	tid_agg_rx->dialog_token = dialog_token;
	313	tid_agg_rx->ssn = start_seq_num;
	314	tid_agg_rx->head_seq_num = start_seq_num;
	315	tid_agg_rx->buf_size = buf_size;
	316	tid_agg_rx->timeout = timeout;
	317	tid_agg_rx->stored_mpdu_num = 0;
	318	status = WLAN_STATUS_SUCCESS;
a87f736d JB	319
	320	/* activate it for RX */
	321	rcu_assign_pointer(sta->ampdu_mlme.tid_rx[tid], tid_agg_rx);
f955ebb4 JB	322
	323	if (timeout)
	324	mod_timer(&tid_agg_rx->session_timer, TU_TO_EXP_TIME(timeout));
	325
b8695a8f	326	end:
a93e3644	327	mutex_unlock(&sta->ampdu_mlme.mtx);
b8695a8f JB	328
	329	end_no_lock:
	330	ieee80211_send_addba_resp(sta->sdata, sta->sta.addr, tid,
	331	dialog_token, status, 1, buf_size, timeout);
	332	}