[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 <net/mac80211.h>
#include "ieee80211_i.h"
#include "driver-ops.h"

void __ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid,
				    u16 initiator, u16 reason)
{
	struct ieee80211_local *local = sta->local;
	int i;

	/* check if TID is in operational state */
	spin_lock_bh(&sta->lock);
	if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL) {
		spin_unlock_bh(&sta->lock);
		return;
	}

	sta->ampdu_mlme.tid_state_rx[tid] =
		HT_AGG_STATE_REQ_STOP_BA_MSK |
		(initiator << HT_AGG_STATE_INITIATOR_SHIFT);
	spin_unlock_bh(&sta->lock);

#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);

	/* shutdown timer has not expired */
	if (initiator != WLAN_BACK_TIMER)
		del_timer_sync(&sta->ampdu_mlme.tid_rx[tid]->session_timer);

	/* check if this is a self generated aggregation halt */
	if (initiator == WLAN_BACK_RECIPIENT || initiator == WLAN_BACK_TIMER)
		ieee80211_send_delba(sta->sdata, sta->sta.addr,
				     tid, 0, reason);

	/* free the reordering buffer */
	for (i = 0; i < sta->ampdu_mlme.tid_rx[tid]->buf_size; i++) {
		if (sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]) {
			/* release the reordered frames */
			dev_kfree_skb(sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]);
			sta->ampdu_mlme.tid_rx[tid]->stored_mpdu_num--;
			sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i] = NULL;
		}
	}

	spin_lock_bh(&sta->lock);
	/* free resources */
	kfree(sta->ampdu_mlme.tid_rx[tid]->reorder_buf);
	kfree(sta->ampdu_mlme.tid_rx[tid]->reorder_time);

	if (!sta->ampdu_mlme.tid_rx[tid]->shutdown) {
		kfree(sta->ampdu_mlme.tid_rx[tid]);
		sta->ampdu_mlme.tid_rx[tid] = NULL;
	}

	sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_IDLE;
	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
	__ieee80211_stop_rx_ba_session(sta, *ptid, WLAN_BACK_RECIPIENT,
				       WLAN_REASON_QSTA_TIMEOUT);
}

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_SUSPEND)) {
#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_state_rx[tid] != HT_AGG_STATE_IDLE) {
#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 */
	sta->ampdu_mlme.tid_rx[tid] =
			kmalloc(sizeof(struct tid_ampdu_rx), GFP_ATOMIC);
	if (!sta->ampdu_mlme.tid_rx[tid]) {
#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 */
	sta->ampdu_mlme.tid_rx[tid]->session_timer.function =
				sta_rx_agg_session_timer_expired;
	sta->ampdu_mlme.tid_rx[tid]->session_timer.data =
				(unsigned long)&sta->timer_to_tid[tid];
	init_timer(&sta->ampdu_mlme.tid_rx[tid]->session_timer);

	tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];

	/* 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(sta->ampdu_mlme.tid_rx[tid]);
		sta->ampdu_mlme.tid_rx[tid] = NULL;
		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);
		sta->ampdu_mlme.tid_rx[tid] = NULL;
		goto end;
	}

	/* change state and send addba resp */
	sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_OPERATIONAL;
	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;
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>
	17	#include <net/mac80211.h>
	18	#include "ieee80211_i.h"
24487981	19	#include "driver-ops.h"
b8695a8f	20
849b7967 JB	21	void __ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid,
849b7967 JB	22	u16 initiator, u16 reason)
b8695a8f	23	{
d75636ef	24	struct ieee80211_local *local = sta->local;
d75636ef	25	int i;
b8695a8f JB	26
	27	/* check if TID is in operational state */
	28	spin_lock_bh(&sta->lock);
d75636ef	29	if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL) {
b8695a8f	30	spin_unlock_bh(&sta->lock);
b8695a8f JB	31	return;
b8695a8f JB	32	}
d75636ef	33
b8695a8f JB	34	sta->ampdu_mlme.tid_state_rx[tid] =
	35	HT_AGG_STATE_REQ_STOP_BA_MSK \|
	36	(initiator << HT_AGG_STATE_INITIATOR_SHIFT);
	37	spin_unlock_bh(&sta->lock);
	38
b8695a8f JB	39	#ifdef CONFIG_MAC80211_HT_DEBUG
b8695a8f JB	40	printk(KERN_DEBUG "Rx BA session stop requested for %pM tid %u\n",
d75636ef	41	sta->sta.addr, tid);
b8695a8f JB	42	#endif /* CONFIG_MAC80211_HT_DEBUG */
b8695a8f JB	43
12375ef9	44	if (drv_ampdu_action(local, sta->sdata, IEEE80211_AMPDU_RX_STOP,
24487981	45	&sta->sta, tid, NULL))
b8695a8f JB	46	printk(KERN_DEBUG "HW problem - can not stop rx "
	47	"aggregation for tid %d\n", tid);
	48
	49	/* shutdown timer has not expired */
	50	if (initiator != WLAN_BACK_TIMER)
	51	del_timer_sync(&sta->ampdu_mlme.tid_rx[tid]->session_timer);
	52
	53	/* check if this is a self generated aggregation halt */
	54	if (initiator == WLAN_BACK_RECIPIENT \|\| initiator == WLAN_BACK_TIMER)
d75636ef JB	55	ieee80211_send_delba(sta->sdata, sta->sta.addr,
d75636ef JB	56	tid, 0, reason);
b8695a8f JB	57
	58	/* free the reordering buffer */
	59	for (i = 0; i < sta->ampdu_mlme.tid_rx[tid]->buf_size; i++) {
	60	if (sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]) {
	61	/* release the reordered frames */
	62	dev_kfree_skb(sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]);
	63	sta->ampdu_mlme.tid_rx[tid]->stored_mpdu_num--;
	64	sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i] = NULL;
	65	}
	66	}
55687e38 JB	67
55687e38 JB	68	spin_lock_bh(&sta->lock);
b8695a8f JB	69	/* free resources */
b8695a8f JB	70	kfree(sta->ampdu_mlme.tid_rx[tid]->reorder_buf);
4d050f1d	71	kfree(sta->ampdu_mlme.tid_rx[tid]->reorder_time);
55687e38 JB	72
	73	if (!sta->ampdu_mlme.tid_rx[tid]->shutdown) {
	74	kfree(sta->ampdu_mlme.tid_rx[tid]);
	75	sta->ampdu_mlme.tid_rx[tid] = NULL;
	76	}
	77
b8695a8f	78	sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_IDLE;
55687e38	79	spin_unlock_bh(&sta->lock);
d75636ef JB	80	}
d75636ef JB	81
b8695a8f JB	82	/*
	83	* After accepting the AddBA Request we activated a timer,
	84	* resetting it after each frame that arrives from the originator.
b8695a8f JB	85	*/
	86	static void sta_rx_agg_session_timer_expired(unsigned long data)
	87	{
	88	/* not an elegant detour, but there is no choice as the timer passes
	89	* only one argument, and various sta_info are needed here, so init
	90	* flow in sta_info_create gives the TID as data, while the timer_to_id
	91	* array gives the sta through container_of */
	92	u8 ptid = (u8 )data;
	93	u8 timer_to_id = ptid - ptid;
	94	struct sta_info *sta = container_of(timer_to_id, struct sta_info,
	95	timer_to_tid[0]);
	96
	97	#ifdef CONFIG_MAC80211_HT_DEBUG
	98	printk(KERN_DEBUG "rx session timer expired on tid %d\n", (u16)*ptid);
	99	#endif
66b0470a JB	100	__ieee80211_stop_rx_ba_session(sta, *ptid, WLAN_BACK_RECIPIENT,
66b0470a JB	101	WLAN_REASON_QSTA_TIMEOUT);
b8695a8f JB	102	}
	103
	104	static void ieee80211_send_addba_resp(struct ieee80211_sub_if_data sdata, u8 da, u16 tid,
	105	u8 dialog_token, u16 status, u16 policy,
	106	u16 buf_size, u16 timeout)
	107	{
b8695a8f JB	108	struct ieee80211_local *local = sdata->local;
	109	struct sk_buff *skb;
	110	struct ieee80211_mgmt *mgmt;
	111	u16 capab;
	112
	113	skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
	114
	115	if (!skb) {
	116	printk(KERN_DEBUG "%s: failed to allocate buffer "
47846c9b	117	"for addba resp frame\n", sdata->name);
b8695a8f JB	118	return;
	119	}
	120
	121	skb_reserve(skb, local->hw.extra_tx_headroom);
	122	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
	123	memset(mgmt, 0, 24);
	124	memcpy(mgmt->da, da, ETH_ALEN);
47846c9b	125	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
8abd3f9b JB	126	if (sdata->vif.type == NL80211_IFTYPE_AP \|\|
8abd3f9b JB	127	sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
47846c9b	128	memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
46900298 JB	129	else if (sdata->vif.type == NL80211_IFTYPE_STATION)
	130	memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
	131
b8695a8f JB	132	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT \|
	133	IEEE80211_STYPE_ACTION);
	134
	135	skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp));
	136	mgmt->u.action.category = WLAN_CATEGORY_BACK;
	137	mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP;
	138	mgmt->u.action.u.addba_resp.dialog_token = dialog_token;
	139
	140	capab = (u16)(policy << 1); /* bit 1 aggregation policy */
	141	capab \|= (u16)(tid << 2); /* bit 5:2 TID number */
	142	capab \|= (u16)(buf_size << 6); /* bit 15:6 max size of aggregation */
	143
	144	mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab);
	145	mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout);
	146	mgmt->u.action.u.addba_resp.status = cpu_to_le16(status);
	147
62ae67be	148	ieee80211_tx_skb(sdata, skb);
b8695a8f JB	149	}
	150
	151	void ieee80211_process_addba_request(struct ieee80211_local *local,
	152	struct sta_info *sta,
	153	struct ieee80211_mgmt *mgmt,
	154	size_t len)
	155	{
	156	struct ieee80211_hw *hw = &local->hw;
	157	struct ieee80211_conf *conf = &hw->conf;
	158	struct tid_ampdu_rx *tid_agg_rx;
	159	u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status;
	160	u8 dialog_token;
	161	int ret = -EOPNOTSUPP;
	162
	163	/* extract session parameters from addba request frame */
	164	dialog_token = mgmt->u.action.u.addba_req.dialog_token;
	165	timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout);
	166	start_seq_num =
	167	le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4;
	168
	169	capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab);
	170	ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1;
	171	tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
	172	buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;
	173
	174	status = WLAN_STATUS_REQUEST_DECLINED;
	175
722f069a S	176	if (test_sta_flags(sta, WLAN_STA_SUSPEND)) {
	177	#ifdef CONFIG_MAC80211_HT_DEBUG
	178	printk(KERN_DEBUG "Suspend in progress. "
	179	"Denying ADDBA request\n");
	180	#endif
	181	goto end_no_lock;
	182	}
	183
b8695a8f JB	184	/* sanity check for incoming parameters:
	185	* check if configuration can support the BA policy
	186	* and if buffer size does not exceeds max value */
	187	/* XXX: check own ht delayed BA capability?? */
f64f9e71 JP	188	if (((ba_policy != 1) &&
	189	(!(sta->sta.ht_cap.cap & IEEE80211_HT_CAP_DELAY_BA))) \|\|
	190	(buf_size > IEEE80211_MAX_AMPDU_BUF)) {
b8695a8f JB	191	status = WLAN_STATUS_INVALID_QOS_PARAM;
	192	#ifdef CONFIG_MAC80211_HT_DEBUG
	193	if (net_ratelimit())
	194	printk(KERN_DEBUG "AddBA Req with bad params from "
	195	"%pM on tid %u. policy %d, buffer size %d\n",
	196	mgmt->sa, tid, ba_policy,
	197	buf_size);
	198	#endif /* CONFIG_MAC80211_HT_DEBUG */
	199	goto end_no_lock;
	200	}
	201	/* determine default buffer size */
	202	if (buf_size == 0) {
	203	struct ieee80211_supported_band *sband;
	204
	205	sband = local->hw.wiphy->bands[conf->channel->band];
	206	buf_size = IEEE80211_MIN_AMPDU_BUF;
	207	buf_size = buf_size << sband->ht_cap.ampdu_factor;
	208	}
	209
	210
	211	/* examine state machine */
	212	spin_lock_bh(&sta->lock);
	213
	214	if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_IDLE) {
	215	#ifdef CONFIG_MAC80211_HT_DEBUG
	216	if (net_ratelimit())
	217	printk(KERN_DEBUG "unexpected AddBA Req from "
	218	"%pM on tid %u\n",
	219	mgmt->sa, tid);
	220	#endif /* CONFIG_MAC80211_HT_DEBUG */
	221	goto end;
	222	}
	223
	224	/* prepare A-MPDU MLME for Rx aggregation */
	225	sta->ampdu_mlme.tid_rx[tid] =
	226	kmalloc(sizeof(struct tid_ampdu_rx), GFP_ATOMIC);
	227	if (!sta->ampdu_mlme.tid_rx[tid]) {
	228	#ifdef CONFIG_MAC80211_HT_DEBUG
	229	if (net_ratelimit())
	230	printk(KERN_ERR "allocate rx mlme to tid %d failed\n",
	231	tid);
	232	#endif
	233	goto end;
	234	}
	235	/* rx timer */
	236	sta->ampdu_mlme.tid_rx[tid]->session_timer.function =
	237	sta_rx_agg_session_timer_expired;
	238	sta->ampdu_mlme.tid_rx[tid]->session_timer.data =
	239	(unsigned long)&sta->timer_to_tid[tid];
	240	init_timer(&sta->ampdu_mlme.tid_rx[tid]->session_timer);
	241
	242	tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
	243
	244	/* prepare reordering buffer */
	245	tid_agg_rx->reorder_buf =
	246	kcalloc(buf_size, sizeof(struct sk_buff *), GFP_ATOMIC);
4d050f1d JM	247	tid_agg_rx->reorder_time =
	248	kcalloc(buf_size, sizeof(unsigned long), GFP_ATOMIC);
	249	if (!tid_agg_rx->reorder_buf \|\| !tid_agg_rx->reorder_time) {
b8695a8f JB	250	#ifdef CONFIG_MAC80211_HT_DEBUG
	251	if (net_ratelimit())
	252	printk(KERN_ERR "can not allocate reordering buffer "
	253	"to tid %d\n", tid);
	254	#endif
4d050f1d JM	255	kfree(tid_agg_rx->reorder_buf);
4d050f1d JM	256	kfree(tid_agg_rx->reorder_time);
b8695a8f	257	kfree(sta->ampdu_mlme.tid_rx[tid]);
4d050f1d	258	sta->ampdu_mlme.tid_rx[tid] = NULL;
b8695a8f JB	259	goto end;
	260	}
	261
12375ef9	262	ret = drv_ampdu_action(local, sta->sdata, IEEE80211_AMPDU_RX_START,
24487981	263	&sta->sta, tid, &start_seq_num);
b8695a8f JB	264	#ifdef CONFIG_MAC80211_HT_DEBUG
	265	printk(KERN_DEBUG "Rx A-MPDU request on tid %d result %d\n", tid, ret);
	266	#endif /* CONFIG_MAC80211_HT_DEBUG */
	267
	268	if (ret) {
	269	kfree(tid_agg_rx->reorder_buf);
	270	kfree(tid_agg_rx);
	271	sta->ampdu_mlme.tid_rx[tid] = NULL;
	272	goto end;
	273	}
	274
	275	/* change state and send addba resp */
	276	sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_OPERATIONAL;
	277	tid_agg_rx->dialog_token = dialog_token;
	278	tid_agg_rx->ssn = start_seq_num;
	279	tid_agg_rx->head_seq_num = start_seq_num;
	280	tid_agg_rx->buf_size = buf_size;
	281	tid_agg_rx->timeout = timeout;
	282	tid_agg_rx->stored_mpdu_num = 0;
	283	status = WLAN_STATUS_SUCCESS;
	284	end:
	285	spin_unlock_bh(&sta->lock);
	286
	287	end_no_lock:
	288	ieee80211_send_addba_resp(sta->sdata, sta->sta.addr, tid,
	289	dialog_token, status, 1, buf_size, timeout);
	290	}