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

	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, 0))
		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);
}

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

	for (i = 0; i < STA_TID_NUM; 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]);

#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();
	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) {
		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 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)
		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]) {
#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 */

		/* 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) {
#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_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) {
#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, 0);
#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
40b275b6 JB	66	tid_rx = rcu_dereference_protected(sta->ampdu_mlme.tid_rx[tid],
40b275b6 JB	67	lockdep_is_held(&sta->ampdu_mlme.mtx));
a87f736d	68
7c3b1dd8	69	if (!tid_rx)
b8695a8f	70	return;
d75636ef	71
a87f736d	72	rcu_assign_pointer(sta->ampdu_mlme.tid_rx[tid], NULL);
b8695a8f	73
b8695a8f JB	74	#ifdef CONFIG_MAC80211_HT_DEBUG
b8695a8f JB	75	printk(KERN_DEBUG "Rx BA session stop requested for %pM tid %u\n",
d75636ef	76	sta->sta.addr, tid);
b8695a8f JB	77	#endif /* CONFIG_MAC80211_HT_DEBUG */
b8695a8f JB	78
12375ef9	79	if (drv_ampdu_action(local, sta->sdata, IEEE80211_AMPDU_RX_STOP,
0b01f030	80	&sta->sta, tid, NULL, 0))
b8695a8f JB	81	printk(KERN_DEBUG "HW problem - can not stop rx "
	82	"aggregation for tid %d\n", tid);
	83
b8695a8f	84	/* check if this is a self generated aggregation halt */
53f73c09	85	if (initiator == WLAN_BACK_RECIPIENT && tx)
d75636ef JB	86	ieee80211_send_delba(sta->sdata, sta->sta.addr,
d75636ef JB	87	tid, 0, reason);
b8695a8f	88
7c3b1dd8	89	del_timer_sync(&tid_rx->session_timer);
2bff8ebf	90	del_timer_sync(&tid_rx->reorder_timer);
a87f736d JB	91
a87f736d JB	92	call_rcu(&tid_rx->rcu_head, ieee80211_free_tid_rx);
b8695a8f JB	93	}
b8695a8f JB	94
2aab4c27	95	void __ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid,
53f73c09	96	u16 initiator, u16 reason, bool tx)
2aab4c27	97	{
a93e3644	98	mutex_lock(&sta->ampdu_mlme.mtx);
53f73c09	99	___ieee80211_stop_rx_ba_session(sta, tid, initiator, reason, tx);
a93e3644	100	mutex_unlock(&sta->ampdu_mlme.mtx);
2aab4c27 JB	101	}
2aab4c27 JB	102
f41ccd71 SL	103	void ieee80211_stop_rx_ba_session(struct ieee80211_vif *vif, u16 ba_rx_bitmap,
	104	const u8 *addr)
	105	{
	106	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
0a557ed3	107	struct sta_info *sta;
f41ccd71 SL	108	int i;
f41ccd71 SL	109
0a557ed3 EP	110	rcu_read_lock();
	111	sta = sta_info_get(sdata, addr);
	112	if (!sta) {
	113	rcu_read_unlock();
	114	return;
	115	}
	116
f41ccd71 SL	117	for (i = 0; i < STA_TID_NUM; i++)
	118	if (ba_rx_bitmap & BIT(i))
	119	set_bit(i, sta->ampdu_mlme.tid_rx_stop_requested);
	120
	121	ieee80211_queue_work(&sta->local->hw, &sta->ampdu_mlme.work);
0a557ed3	122	rcu_read_unlock();
f41ccd71 SL	123	}
	124	EXPORT_SYMBOL(ieee80211_stop_rx_ba_session);
	125
b8695a8f JB	126	/*
	127	* After accepting the AddBA Request we activated a timer,
	128	* resetting it after each frame that arrives from the originator.
b8695a8f JB	129	*/
	130	static void sta_rx_agg_session_timer_expired(unsigned long data)
	131	{
	132	/* not an elegant detour, but there is no choice as the timer passes
	133	* only one argument, and various sta_info are needed here, so init
	134	* flow in sta_info_create gives the TID as data, while the timer_to_id
	135	* array gives the sta through container_of */
	136	u8 ptid = (u8 )data;
	137	u8 timer_to_id = ptid - ptid;
	138	struct sta_info *sta = container_of(timer_to_id, struct sta_info,
	139	timer_to_tid[0]);
	140
	141	#ifdef CONFIG_MAC80211_HT_DEBUG
	142	printk(KERN_DEBUG "rx session timer expired on tid %d\n", (u16)*ptid);
	143	#endif
7c3b1dd8 JB	144	set_bit(*ptid, sta->ampdu_mlme.tid_rx_timer_expired);
7c3b1dd8 JB	145	ieee80211_queue_work(&sta->local->hw, &sta->ampdu_mlme.work);
b8695a8f JB	146	}
b8695a8f JB	147
2bff8ebf CL	148	static void sta_rx_agg_reorder_timer_expired(unsigned long data)
	149	{
	150	u8 ptid = (u8 )data;
	151	u8 timer_to_id = ptid - ptid;
	152	struct sta_info *sta = container_of(timer_to_id, struct sta_info,
	153	timer_to_tid[0]);
	154
	155	rcu_read_lock();
2bff8ebf	156	ieee80211_release_reorder_timeout(sta, *ptid);
2bff8ebf CL	157	rcu_read_unlock();
	158	}
	159
b8695a8f JB	160	static void ieee80211_send_addba_resp(struct ieee80211_sub_if_data sdata, u8 da, u16 tid,
	161	u8 dialog_token, u16 status, u16 policy,
	162	u16 buf_size, u16 timeout)
	163	{
b8695a8f JB	164	struct ieee80211_local *local = sdata->local;
	165	struct sk_buff *skb;
	166	struct ieee80211_mgmt *mgmt;
	167	u16 capab;
	168
	169	skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
	170
	171	if (!skb) {
	172	printk(KERN_DEBUG "%s: failed to allocate buffer "
47846c9b	173	"for addba resp frame\n", sdata->name);
b8695a8f JB	174	return;
	175	}
	176
	177	skb_reserve(skb, local->hw.extra_tx_headroom);
	178	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
	179	memset(mgmt, 0, 24);
	180	memcpy(mgmt->da, da, ETH_ALEN);
47846c9b	181	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
8abd3f9b JB	182	if (sdata->vif.type == NL80211_IFTYPE_AP \|\|
8abd3f9b JB	183	sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
47846c9b	184	memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
46900298 JB	185	else if (sdata->vif.type == NL80211_IFTYPE_STATION)
	186	memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
	187
b8695a8f JB	188	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT \|
	189	IEEE80211_STYPE_ACTION);
	190
	191	skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp));
	192	mgmt->u.action.category = WLAN_CATEGORY_BACK;
	193	mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP;
	194	mgmt->u.action.u.addba_resp.dialog_token = dialog_token;
	195
	196	capab = (u16)(policy << 1); /* bit 1 aggregation policy */
	197	capab \|= (u16)(tid << 2); /* bit 5:2 TID number */
	198	capab \|= (u16)(buf_size << 6); /* bit 15:6 max size of aggregation */
	199
	200	mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab);
	201	mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout);
	202	mgmt->u.action.u.addba_resp.status = cpu_to_le16(status);
	203
62ae67be	204	ieee80211_tx_skb(sdata, skb);
b8695a8f JB	205	}
	206
	207	void ieee80211_process_addba_request(struct ieee80211_local *local,
	208	struct sta_info *sta,
	209	struct ieee80211_mgmt *mgmt,
	210	size_t len)
	211	{
b8695a8f JB	212	struct tid_ampdu_rx *tid_agg_rx;
	213	u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status;
	214	u8 dialog_token;
	215	int ret = -EOPNOTSUPP;
	216
	217	/* extract session parameters from addba request frame */
	218	dialog_token = mgmt->u.action.u.addba_req.dialog_token;
	219	timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout);
	220	start_seq_num =
	221	le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4;
	222
	223	capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab);
	224	ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1;
	225	tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
	226	buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;
	227
	228	status = WLAN_STATUS_REQUEST_DECLINED;
	229
618f356b	230	if (test_sta_flags(sta, WLAN_STA_BLOCK_BA)) {
722f069a S	231	#ifdef CONFIG_MAC80211_HT_DEBUG
	232	printk(KERN_DEBUG "Suspend in progress. "
	233	"Denying ADDBA request\n");
	234	#endif
	235	goto end_no_lock;
	236	}
	237
b8695a8f JB	238	/* sanity check for incoming parameters:
	239	* check if configuration can support the BA policy
	240	* and if buffer size does not exceeds max value */
	241	/* XXX: check own ht delayed BA capability?? */
f64f9e71 JP	242	if (((ba_policy != 1) &&
	243	(!(sta->sta.ht_cap.cap & IEEE80211_HT_CAP_DELAY_BA))) \|\|
	244	(buf_size > IEEE80211_MAX_AMPDU_BUF)) {
b8695a8f JB	245	status = WLAN_STATUS_INVALID_QOS_PARAM;
	246	#ifdef CONFIG_MAC80211_HT_DEBUG
	247	if (net_ratelimit())
	248	printk(KERN_DEBUG "AddBA Req with bad params from "
	249	"%pM on tid %u. policy %d, buffer size %d\n",
	250	mgmt->sa, tid, ba_policy,
	251	buf_size);
	252	#endif /* CONFIG_MAC80211_HT_DEBUG */
	253	goto end_no_lock;
	254	}
	255	/* determine default buffer size */
82694f76 LC	256	if (buf_size == 0)
82694f76 LC	257	buf_size = IEEE80211_MAX_AMPDU_BUF;
b8695a8f	258
df6ba5d8 LC	259	/* make sure the size doesn't exceed the maximum supported by the hw */
	260	if (buf_size > local->hw.max_rx_aggregation_subframes)
	261	buf_size = local->hw.max_rx_aggregation_subframes;
b8695a8f JB	262
b8695a8f JB	263	/* examine state machine */
a93e3644	264	mutex_lock(&sta->ampdu_mlme.mtx);
b8695a8f	265
a87f736d	266	if (sta->ampdu_mlme.tid_rx[tid]) {
b8695a8f JB	267	#ifdef CONFIG_MAC80211_HT_DEBUG
	268	if (net_ratelimit())
	269	printk(KERN_DEBUG "unexpected AddBA Req from "
	270	"%pM on tid %u\n",
	271	mgmt->sa, tid);
	272	#endif /* CONFIG_MAC80211_HT_DEBUG */
15b4d843 AN	273
	274	/* delete existing Rx BA session on the same tid */
	275	___ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_RECIPIENT,
	276	WLAN_STATUS_UNSPECIFIED_QOS,
	277	false);
b8695a8f JB	278	}
	279
	280	/* prepare A-MPDU MLME for Rx aggregation */
dd318575	281	tid_agg_rx = kmalloc(sizeof(struct tid_ampdu_rx), GFP_KERNEL);
a87f736d	282	if (!tid_agg_rx) {
b8695a8f JB	283	#ifdef CONFIG_MAC80211_HT_DEBUG
	284	if (net_ratelimit())
	285	printk(KERN_ERR "allocate rx mlme to tid %d failed\n",
	286	tid);
	287	#endif
	288	goto end;
	289	}
b8695a8f	290
2bff8ebf CL	291	spin_lock_init(&tid_agg_rx->reorder_lock);
2bff8ebf CL	292
a87f736d JB	293	/* rx timer */
	294	tid_agg_rx->session_timer.function = sta_rx_agg_session_timer_expired;
	295	tid_agg_rx->session_timer.data = (unsigned long)&sta->timer_to_tid[tid];
	296	init_timer(&tid_agg_rx->session_timer);
b8695a8f	297
2bff8ebf CL	298	/* rx reorder timer */
	299	tid_agg_rx->reorder_timer.function = sta_rx_agg_reorder_timer_expired;
	300	tid_agg_rx->reorder_timer.data = (unsigned long)&sta->timer_to_tid[tid];
	301	init_timer(&tid_agg_rx->reorder_timer);
	302
b8695a8f JB	303	/* prepare reordering buffer */
b8695a8f JB	304	tid_agg_rx->reorder_buf =
dd318575	305	kcalloc(buf_size, sizeof(struct sk_buff *), GFP_KERNEL);
4d050f1d	306	tid_agg_rx->reorder_time =
dd318575	307	kcalloc(buf_size, sizeof(unsigned long), GFP_KERNEL);
4d050f1d	308	if (!tid_agg_rx->reorder_buf \|\| !tid_agg_rx->reorder_time) {
b8695a8f JB	309	#ifdef CONFIG_MAC80211_HT_DEBUG
	310	if (net_ratelimit())
	311	printk(KERN_ERR "can not allocate reordering buffer "
	312	"to tid %d\n", tid);
	313	#endif
4d050f1d JM	314	kfree(tid_agg_rx->reorder_buf);
4d050f1d JM	315	kfree(tid_agg_rx->reorder_time);
a87f736d	316	kfree(tid_agg_rx);
b8695a8f JB	317	goto end;
	318	}
	319
12375ef9	320	ret = drv_ampdu_action(local, sta->sdata, IEEE80211_AMPDU_RX_START,
0b01f030	321	&sta->sta, tid, &start_seq_num, 0);
b8695a8f JB	322	#ifdef CONFIG_MAC80211_HT_DEBUG
	323	printk(KERN_DEBUG "Rx A-MPDU request on tid %d result %d\n", tid, ret);
	324	#endif /* CONFIG_MAC80211_HT_DEBUG */
	325
	326	if (ret) {
	327	kfree(tid_agg_rx->reorder_buf);
a87f736d	328	kfree(tid_agg_rx->reorder_time);
b8695a8f	329	kfree(tid_agg_rx);
b8695a8f JB	330	goto end;
	331	}
	332
a87f736d	333	/* update data */
b8695a8f JB	334	tid_agg_rx->dialog_token = dialog_token;
	335	tid_agg_rx->ssn = start_seq_num;
	336	tid_agg_rx->head_seq_num = start_seq_num;
	337	tid_agg_rx->buf_size = buf_size;
	338	tid_agg_rx->timeout = timeout;
	339	tid_agg_rx->stored_mpdu_num = 0;
	340	status = WLAN_STATUS_SUCCESS;
a87f736d JB	341
	342	/* activate it for RX */
	343	rcu_assign_pointer(sta->ampdu_mlme.tid_rx[tid], tid_agg_rx);
f955ebb4 JB	344
	345	if (timeout)
	346	mod_timer(&tid_agg_rx->session_timer, TU_TO_EXP_TIME(timeout));
	347
b8695a8f	348	end:
a93e3644	349	mutex_unlock(&sta->ampdu_mlme.mtx);
b8695a8f JB	350
	351	end_no_lock:
	352	ieee80211_send_addba_resp(sta->sdata, sta->sta.addr, tid,
	353	dialog_token, status, 1, buf_size, timeout);
	354	}