[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 2007-2008, 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.
 */

#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)
{
	struct ieee80211_local *local = sta->local;
	struct tid_ampdu_rx *tid_rx;

	lockdep_assert_held(&sta->lock);

	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)
		ieee80211_send_delba(sta->sdata, sta->sta.addr,
				     tid, 0, reason);

	del_timer_sync(&tid_rx->session_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)
{
	spin_lock_bh(&sta->lock);
	___ieee80211_stop_rx_ba_session(sta, tid, initiator, reason);
	spin_unlock_bh(&sta->lock);
}

/*
 * 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 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 */
	spin_lock_bh(&sta->lock);

	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;
	}

	/* 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);

	/* 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);
end:
	spin_unlock_bh(&sta->lock);

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>
	9	* Copyright 2007-2008, Intel Corporation
	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
	16	#include <linux/ieee80211.h>
5a0e3ad6	17	#include <linux/slab.h>
b8695a8f JB	18	#include <net/mac80211.h>
b8695a8f JB	19	#include "ieee80211_i.h"
24487981	20	#include "driver-ops.h"
b8695a8f	21
a87f736d JB	22	static void ieee80211_free_tid_rx(struct rcu_head *h)
	23	{
	24	struct tid_ampdu_rx *tid_rx =
	25	container_of(h, struct tid_ampdu_rx, rcu_head);
	26	int i;
	27
	28	for (i = 0; i < tid_rx->buf_size; i++)
	29	dev_kfree_skb(tid_rx->reorder_buf[i]);
	30	kfree(tid_rx->reorder_buf);
	31	kfree(tid_rx->reorder_time);
	32	kfree(tid_rx);
	33	}
	34
7c3b1dd8 JB	35	void ___ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid,
7c3b1dd8 JB	36	u16 initiator, u16 reason)
b8695a8f	37	{
d75636ef	38	struct ieee80211_local *local = sta->local;
098a6070	39	struct tid_ampdu_rx *tid_rx;
b8695a8f	40
7c3b1dd8	41	lockdep_assert_held(&sta->lock);
098a6070	42
a87f736d JB	43	tid_rx = sta->ampdu_mlme.tid_rx[tid];
a87f736d JB	44
7c3b1dd8	45	if (!tid_rx)
b8695a8f	46	return;
d75636ef	47
a87f736d	48	rcu_assign_pointer(sta->ampdu_mlme.tid_rx[tid], NULL);
b8695a8f	49
b8695a8f JB	50	#ifdef CONFIG_MAC80211_HT_DEBUG
b8695a8f JB	51	printk(KERN_DEBUG "Rx BA session stop requested for %pM tid %u\n",
d75636ef	52	sta->sta.addr, tid);
b8695a8f JB	53	#endif /* CONFIG_MAC80211_HT_DEBUG */
b8695a8f JB	54
12375ef9	55	if (drv_ampdu_action(local, sta->sdata, IEEE80211_AMPDU_RX_STOP,
24487981	56	&sta->sta, tid, NULL))
b8695a8f JB	57	printk(KERN_DEBUG "HW problem - can not stop rx "
	58	"aggregation for tid %d\n", tid);
	59
b8695a8f	60	/* check if this is a self generated aggregation halt */
098a6070	61	if (initiator == WLAN_BACK_RECIPIENT)
d75636ef JB	62	ieee80211_send_delba(sta->sdata, sta->sta.addr,
d75636ef JB	63	tid, 0, reason);
b8695a8f	64
7c3b1dd8	65	del_timer_sync(&tid_rx->session_timer);
a87f736d JB	66
a87f736d JB	67	call_rcu(&tid_rx->rcu_head, ieee80211_free_tid_rx);
b8695a8f JB	68	}
b8695a8f JB	69
2aab4c27 JB	70	void __ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid,
	71	u16 initiator, u16 reason)
	72	{
7c3b1dd8 JB	73	spin_lock_bh(&sta->lock);
	74	___ieee80211_stop_rx_ba_session(sta, tid, initiator, reason);
	75	spin_unlock_bh(&sta->lock);
2aab4c27 JB	76	}
2aab4c27 JB	77
b8695a8f JB	78	/*
	79	* After accepting the AddBA Request we activated a timer,
	80	* resetting it after each frame that arrives from the originator.
b8695a8f JB	81	*/
	82	static void sta_rx_agg_session_timer_expired(unsigned long data)
	83	{
	84	/* not an elegant detour, but there is no choice as the timer passes
	85	* only one argument, and various sta_info are needed here, so init
	86	* flow in sta_info_create gives the TID as data, while the timer_to_id
	87	* array gives the sta through container_of */
	88	u8 ptid = (u8 )data;
	89	u8 timer_to_id = ptid - ptid;
	90	struct sta_info *sta = container_of(timer_to_id, struct sta_info,
	91	timer_to_tid[0]);
	92
	93	#ifdef CONFIG_MAC80211_HT_DEBUG
	94	printk(KERN_DEBUG "rx session timer expired on tid %d\n", (u16)*ptid);
	95	#endif
7c3b1dd8 JB	96	set_bit(*ptid, sta->ampdu_mlme.tid_rx_timer_expired);
7c3b1dd8 JB	97	ieee80211_queue_work(&sta->local->hw, &sta->ampdu_mlme.work);
b8695a8f JB	98	}
	99
	100	static void ieee80211_send_addba_resp(struct ieee80211_sub_if_data sdata, u8 da, u16 tid,
	101	u8 dialog_token, u16 status, u16 policy,
	102	u16 buf_size, u16 timeout)
	103	{
b8695a8f JB	104	struct ieee80211_local *local = sdata->local;
	105	struct sk_buff *skb;
	106	struct ieee80211_mgmt *mgmt;
	107	u16 capab;
	108
	109	skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
	110
	111	if (!skb) {
	112	printk(KERN_DEBUG "%s: failed to allocate buffer "
47846c9b	113	"for addba resp frame\n", sdata->name);
b8695a8f JB	114	return;
	115	}
	116
	117	skb_reserve(skb, local->hw.extra_tx_headroom);
	118	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
	119	memset(mgmt, 0, 24);
	120	memcpy(mgmt->da, da, ETH_ALEN);
47846c9b	121	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
8abd3f9b JB	122	if (sdata->vif.type == NL80211_IFTYPE_AP \|\|
8abd3f9b JB	123	sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
47846c9b	124	memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
46900298 JB	125	else if (sdata->vif.type == NL80211_IFTYPE_STATION)
	126	memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
	127
b8695a8f JB	128	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT \|
	129	IEEE80211_STYPE_ACTION);
	130
	131	skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp));
	132	mgmt->u.action.category = WLAN_CATEGORY_BACK;
	133	mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP;
	134	mgmt->u.action.u.addba_resp.dialog_token = dialog_token;
	135
	136	capab = (u16)(policy << 1); /* bit 1 aggregation policy */
	137	capab \|= (u16)(tid << 2); /* bit 5:2 TID number */
	138	capab \|= (u16)(buf_size << 6); /* bit 15:6 max size of aggregation */
	139
	140	mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab);
	141	mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout);
	142	mgmt->u.action.u.addba_resp.status = cpu_to_le16(status);
	143
62ae67be	144	ieee80211_tx_skb(sdata, skb);
b8695a8f JB	145	}
	146
	147	void ieee80211_process_addba_request(struct ieee80211_local *local,
	148	struct sta_info *sta,
	149	struct ieee80211_mgmt *mgmt,
	150	size_t len)
	151	{
	152	struct ieee80211_hw *hw = &local->hw;
	153	struct ieee80211_conf *conf = &hw->conf;
	154	struct tid_ampdu_rx *tid_agg_rx;
	155	u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status;
	156	u8 dialog_token;
	157	int ret = -EOPNOTSUPP;
	158
	159	/* extract session parameters from addba request frame */
	160	dialog_token = mgmt->u.action.u.addba_req.dialog_token;
	161	timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout);
	162	start_seq_num =
	163	le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4;
	164
	165	capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab);
	166	ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1;
	167	tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
	168	buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;
	169
	170	status = WLAN_STATUS_REQUEST_DECLINED;
	171
618f356b	172	if (test_sta_flags(sta, WLAN_STA_BLOCK_BA)) {
722f069a S	173	#ifdef CONFIG_MAC80211_HT_DEBUG
	174	printk(KERN_DEBUG "Suspend in progress. "
	175	"Denying ADDBA request\n");
	176	#endif
	177	goto end_no_lock;
	178	}
	179
b8695a8f JB	180	/* sanity check for incoming parameters:
	181	* check if configuration can support the BA policy
	182	* and if buffer size does not exceeds max value */
	183	/* XXX: check own ht delayed BA capability?? */
f64f9e71 JP	184	if (((ba_policy != 1) &&
	185	(!(sta->sta.ht_cap.cap & IEEE80211_HT_CAP_DELAY_BA))) \|\|
	186	(buf_size > IEEE80211_MAX_AMPDU_BUF)) {
b8695a8f JB	187	status = WLAN_STATUS_INVALID_QOS_PARAM;
	188	#ifdef CONFIG_MAC80211_HT_DEBUG
	189	if (net_ratelimit())
	190	printk(KERN_DEBUG "AddBA Req with bad params from "
	191	"%pM on tid %u. policy %d, buffer size %d\n",
	192	mgmt->sa, tid, ba_policy,
	193	buf_size);
	194	#endif /* CONFIG_MAC80211_HT_DEBUG */
	195	goto end_no_lock;
	196	}
	197	/* determine default buffer size */
	198	if (buf_size == 0) {
	199	struct ieee80211_supported_band *sband;
	200
	201	sband = local->hw.wiphy->bands[conf->channel->band];
	202	buf_size = IEEE80211_MIN_AMPDU_BUF;
	203	buf_size = buf_size << sband->ht_cap.ampdu_factor;
	204	}
	205
	206
	207	/* examine state machine */
	208	spin_lock_bh(&sta->lock);
	209
a87f736d	210	if (sta->ampdu_mlme.tid_rx[tid]) {
b8695a8f JB	211	#ifdef CONFIG_MAC80211_HT_DEBUG
	212	if (net_ratelimit())
	213	printk(KERN_DEBUG "unexpected AddBA Req from "
	214	"%pM on tid %u\n",
	215	mgmt->sa, tid);
	216	#endif /* CONFIG_MAC80211_HT_DEBUG */
	217	goto end;
	218	}
	219
	220	/* prepare A-MPDU MLME for Rx aggregation */
a87f736d JB	221	tid_agg_rx = kmalloc(sizeof(struct tid_ampdu_rx), GFP_ATOMIC);
a87f736d JB	222	if (!tid_agg_rx) {
b8695a8f JB	223	#ifdef CONFIG_MAC80211_HT_DEBUG
	224	if (net_ratelimit())
	225	printk(KERN_ERR "allocate rx mlme to tid %d failed\n",
	226	tid);
	227	#endif
	228	goto end;
	229	}
b8695a8f	230
a87f736d JB	231	/* rx timer */
	232	tid_agg_rx->session_timer.function = sta_rx_agg_session_timer_expired;
	233	tid_agg_rx->session_timer.data = (unsigned long)&sta->timer_to_tid[tid];
	234	init_timer(&tid_agg_rx->session_timer);
b8695a8f JB	235
	236	/* prepare reordering buffer */
	237	tid_agg_rx->reorder_buf =
	238	kcalloc(buf_size, sizeof(struct sk_buff *), GFP_ATOMIC);
4d050f1d JM	239	tid_agg_rx->reorder_time =
	240	kcalloc(buf_size, sizeof(unsigned long), GFP_ATOMIC);
	241	if (!tid_agg_rx->reorder_buf \|\| !tid_agg_rx->reorder_time) {
b8695a8f JB	242	#ifdef CONFIG_MAC80211_HT_DEBUG
	243	if (net_ratelimit())
	244	printk(KERN_ERR "can not allocate reordering buffer "
	245	"to tid %d\n", tid);
	246	#endif
4d050f1d JM	247	kfree(tid_agg_rx->reorder_buf);
4d050f1d JM	248	kfree(tid_agg_rx->reorder_time);
a87f736d	249	kfree(tid_agg_rx);
b8695a8f JB	250	goto end;
	251	}
	252
12375ef9	253	ret = drv_ampdu_action(local, sta->sdata, IEEE80211_AMPDU_RX_START,
24487981	254	&sta->sta, tid, &start_seq_num);
b8695a8f JB	255	#ifdef CONFIG_MAC80211_HT_DEBUG
	256	printk(KERN_DEBUG "Rx A-MPDU request on tid %d result %d\n", tid, ret);
	257	#endif /* CONFIG_MAC80211_HT_DEBUG */
	258
	259	if (ret) {
	260	kfree(tid_agg_rx->reorder_buf);
a87f736d	261	kfree(tid_agg_rx->reorder_time);
b8695a8f	262	kfree(tid_agg_rx);
b8695a8f JB	263	goto end;
	264	}
	265
a87f736d	266	/* update data */
b8695a8f JB	267	tid_agg_rx->dialog_token = dialog_token;
	268	tid_agg_rx->ssn = start_seq_num;
	269	tid_agg_rx->head_seq_num = start_seq_num;
	270	tid_agg_rx->buf_size = buf_size;
	271	tid_agg_rx->timeout = timeout;
	272	tid_agg_rx->stored_mpdu_num = 0;
	273	status = WLAN_STATUS_SUCCESS;
a87f736d JB	274
	275	/* activate it for RX */
	276	rcu_assign_pointer(sta->ampdu_mlme.tid_rx[tid], tid_agg_rx);
b8695a8f JB	277	end:
	278	spin_unlock_bh(&sta->lock);
	279
	280	end_no_lock:
	281	ieee80211_send_addba_resp(sta->sdata, sta->sta.addr, tid,
	282	dialog_token, status, 1, buf_size, timeout);
	283	}