1 files changed, 310 insertions, 0 deletions
diff --git a/net/mac80211/agg-rx.c b/net/mac80211/agg-rx.c
new file mode 100644
index 000000000000..07656d830bc4
--- /dev/null
+++ b/net/mac80211/agg-rx.c
@@ -0,0 +1,310 @@
+/*
+ * 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"
+void __ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid,
+                                    u16 initiator, u16 reason)
+{
+        struct ieee80211_local *local = sta->local;
+        struct ieee80211_hw *hw = &local->hw;
+        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 (local->ops->ampdu_action(hw, 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);
+        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);
+}
+void ieee80211_sta_stop_rx_ba_session(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid,
+                                        u16 initiator, u16 reason)
+{
+        struct ieee80211_local *local = sdata->local;
+        struct sta_info *sta;
+        /* stop HW Rx aggregation. ampdu_action existence
+         * already verified in session init so we add the BUG_ON */
+        BUG_ON(!local->ops->ampdu_action);
+        rcu_read_lock();
+        sta = sta_info_get(local, ra);
+        if (!sta) {
+                rcu_read_unlock();
+                return;
+        }
+        __ieee80211_stop_rx_ba_session(sta, tid, initiator, reason);
+        rcu_read_unlock();
+}
+/*
+ * After accepting the AddBA Request we activated a timer,
+ * resetting it after each frame that arrives from the originator.
+ * if this timer expires ieee80211_sta_stop_rx_ba_session will be executed.
+ */
+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_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr,
+                                         (u16)*ptid, WLAN_BACK_TIMER,
+                                         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->dev->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->dev->dev_addr, ETH_ALEN);
+        if (sdata->vif.type == NL80211_IFTYPE_AP ||
+            sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
+                memcpy(mgmt->bssid, sdata->dev->dev_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, 1);
+}
+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);
+        if (!tid_agg_rx->reorder_buf) {
+#ifdef CONFIG_MAC80211_HT_DEBUG
+                if (net_ratelimit())
+                        printk(KERN_ERR "can not allocate reordering buffer "
+                               "to tid %d\n", tid);
+#endif
+                kfree(sta->ampdu_mlme.tid_rx[tid]);
+                goto end;
+        }
+        if (local->ops->ampdu_action)
+                ret = local->ops->ampdu_action(hw, 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);
+}

diff --git a/net/mac80211/agg-rx.c b/net/mac80211/agg-rx.c new file mode 100644 index 000000000000..07656d830bc4 --- /dev/null +++ b/net/mac80211/agg-rx.c
@@ -0,0 +1,310 @@
	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"
	19
	20	void __ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid,
	21	u16 initiator, u16 reason)
	22	{
	23	struct ieee80211_local *local = sta->local;
	24	struct ieee80211_hw *hw = &local->hw;
	25	int i;
	26
	27	/* check if TID is in operational state */
	28	spin_lock_bh(&sta->lock);
	29	if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL) {
	30	spin_unlock_bh(&sta->lock);
	31	return;
	32	}
	33
	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
	39	#ifdef CONFIG_MAC80211_HT_DEBUG
	40	printk(KERN_DEBUG "Rx BA session stop requested for %pM tid %u\n",
	41	sta->sta.addr, tid);
	42	#endif /* CONFIG_MAC80211_HT_DEBUG */
	43
	44	if (local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_STOP,
	45	&sta->sta, tid, NULL))
	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)
	55	ieee80211_send_delba(sta->sdata, sta->sta.addr,
	56	tid, 0, reason);
	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	}
	67
	68	spin_lock_bh(&sta->lock);
	69	/* free resources */
	70	kfree(sta->ampdu_mlme.tid_rx[tid]->reorder_buf);
	71
	72	if (!sta->ampdu_mlme.tid_rx[tid]->shutdown) {
	73	kfree(sta->ampdu_mlme.tid_rx[tid]);
	74	sta->ampdu_mlme.tid_rx[tid] = NULL;
	75	}
	76
	77	sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_IDLE;
	78	spin_unlock_bh(&sta->lock);
	79	}
	80
	81	void ieee80211_sta_stop_rx_ba_session(struct ieee80211_sub_if_data sdata, u8 ra, u16 tid,
	82	u16 initiator, u16 reason)
	83	{
	84	struct ieee80211_local *local = sdata->local;
	85	struct sta_info *sta;
	86
	87	/* stop HW Rx aggregation. ampdu_action existence
	88	* already verified in session init so we add the BUG_ON */
	89	BUG_ON(!local->ops->ampdu_action);
	90
	91	rcu_read_lock();
	92
	93	sta = sta_info_get(local, ra);
	94	if (!sta) {
	95	rcu_read_unlock();
	96	return;
	97	}
	98
	99	__ieee80211_stop_rx_ba_session(sta, tid, initiator, reason);
	100
	101	rcu_read_unlock();
	102	}
	103
	104	/*
	105	* After accepting the AddBA Request we activated a timer,
	106	* resetting it after each frame that arrives from the originator.
	107	* if this timer expires ieee80211_sta_stop_rx_ba_session will be executed.
	108	*/
	109	static void sta_rx_agg_session_timer_expired(unsigned long data)
	110	{
	111	/* not an elegant detour, but there is no choice as the timer passes
	112	* only one argument, and various sta_info are needed here, so init
	113	* flow in sta_info_create gives the TID as data, while the timer_to_id
	114	* array gives the sta through container_of */
	115	u8 ptid = (u8 )data;
	116	u8 timer_to_id = ptid - ptid;
	117	struct sta_info *sta = container_of(timer_to_id, struct sta_info,
	118	timer_to_tid[0]);
	119
	120	#ifdef CONFIG_MAC80211_HT_DEBUG
	121	printk(KERN_DEBUG "rx session timer expired on tid %d\n", (u16)*ptid);
	122	#endif
	123	ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr,
	124	(u16)*ptid, WLAN_BACK_TIMER,
	125	WLAN_REASON_QSTA_TIMEOUT);
	126	}
	127
	128	static void ieee80211_send_addba_resp(struct ieee80211_sub_if_data sdata, u8 da, u16 tid,
	129	u8 dialog_token, u16 status, u16 policy,
	130	u16 buf_size, u16 timeout)
	131	{
	132	struct ieee80211_local *local = sdata->local;
	133	struct sk_buff *skb;
	134	struct ieee80211_mgmt *mgmt;
	135	u16 capab;
	136
	137	skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
	138
	139	if (!skb) {
	140	printk(KERN_DEBUG "%s: failed to allocate buffer "
	141	"for addba resp frame\n", sdata->dev->name);
	142	return;
	143	}
	144
	145	skb_reserve(skb, local->hw.extra_tx_headroom);
	146	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
	147	memset(mgmt, 0, 24);
	148	memcpy(mgmt->da, da, ETH_ALEN);
	149	memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
	150	if (sdata->vif.type == NL80211_IFTYPE_AP \|\|
	151	sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
	152	memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
	153	else if (sdata->vif.type == NL80211_IFTYPE_STATION)
	154	memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
	155
	156	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT \|
	157	IEEE80211_STYPE_ACTION);
	158
	159	skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp));
	160	mgmt->u.action.category = WLAN_CATEGORY_BACK;
	161	mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP;
	162	mgmt->u.action.u.addba_resp.dialog_token = dialog_token;
	163
	164	capab = (u16)(policy << 1); /* bit 1 aggregation policy */
	165	capab \|= (u16)(tid << 2); /* bit 5:2 TID number */
	166	capab \|= (u16)(buf_size << 6); /* bit 15:6 max size of aggregation */
	167
	168	mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab);
	169	mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout);
	170	mgmt->u.action.u.addba_resp.status = cpu_to_le16(status);
	171
	172	ieee80211_tx_skb(sdata, skb, 1);
	173	}
	174
	175	void ieee80211_process_addba_request(struct ieee80211_local *local,
	176	struct sta_info *sta,
	177	struct ieee80211_mgmt *mgmt,
	178	size_t len)
	179	{
	180	struct ieee80211_hw *hw = &local->hw;
	181	struct ieee80211_conf *conf = &hw->conf;
	182	struct tid_ampdu_rx *tid_agg_rx;
	183	u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status;
	184	u8 dialog_token;
	185	int ret = -EOPNOTSUPP;
	186
	187	/* extract session parameters from addba request frame */
	188	dialog_token = mgmt->u.action.u.addba_req.dialog_token;
	189	timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout);
	190	start_seq_num =
	191	le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4;
	192
	193	capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab);
	194	ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1;
	195	tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
	196	buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;
	197
	198	status = WLAN_STATUS_REQUEST_DECLINED;
	199
	200	if (test_sta_flags(sta, WLAN_STA_SUSPEND)) {
	201	#ifdef CONFIG_MAC80211_HT_DEBUG
	202	printk(KERN_DEBUG "Suspend in progress. "
	203	"Denying ADDBA request\n");
	204	#endif
	205	goto end_no_lock;
	206	}
	207
	208	/* sanity check for incoming parameters:
	209	* check if configuration can support the BA policy
	210	* and if buffer size does not exceeds max value */
	211	/* XXX: check own ht delayed BA capability?? */
	212	if (((ba_policy != 1)
	213	&& (!(sta->sta.ht_cap.cap & IEEE80211_HT_CAP_DELAY_BA)))
	214	\|\| (buf_size > IEEE80211_MAX_AMPDU_BUF)) {
	215	status = WLAN_STATUS_INVALID_QOS_PARAM;
	216	#ifdef CONFIG_MAC80211_HT_DEBUG
	217	if (net_ratelimit())
	218	printk(KERN_DEBUG "AddBA Req with bad params from "
	219	"%pM on tid %u. policy %d, buffer size %d\n",
	220	mgmt->sa, tid, ba_policy,
	221	buf_size);
	222	#endif /* CONFIG_MAC80211_HT_DEBUG */
	223	goto end_no_lock;
	224	}
	225	/* determine default buffer size */
	226	if (buf_size == 0) {
	227	struct ieee80211_supported_band *sband;
	228
	229	sband = local->hw.wiphy->bands[conf->channel->band];
	230	buf_size = IEEE80211_MIN_AMPDU_BUF;
	231	buf_size = buf_size << sband->ht_cap.ampdu_factor;
	232	}
	233
	234
	235	/* examine state machine */
	236	spin_lock_bh(&sta->lock);
	237
	238	if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_IDLE) {
	239	#ifdef CONFIG_MAC80211_HT_DEBUG
	240	if (net_ratelimit())
	241	printk(KERN_DEBUG "unexpected AddBA Req from "
	242	"%pM on tid %u\n",
	243	mgmt->sa, tid);
	244	#endif /* CONFIG_MAC80211_HT_DEBUG */
	245	goto end;
	246	}
	247
	248	/* prepare A-MPDU MLME for Rx aggregation */
	249	sta->ampdu_mlme.tid_rx[tid] =
	250	kmalloc(sizeof(struct tid_ampdu_rx), GFP_ATOMIC);
	251	if (!sta->ampdu_mlme.tid_rx[tid]) {
	252	#ifdef CONFIG_MAC80211_HT_DEBUG
	253	if (net_ratelimit())
	254	printk(KERN_ERR "allocate rx mlme to tid %d failed\n",
	255	tid);
	256	#endif
	257	goto end;
	258	}
	259	/* rx timer */
	260	sta->ampdu_mlme.tid_rx[tid]->session_timer.function =
	261	sta_rx_agg_session_timer_expired;
	262	sta->ampdu_mlme.tid_rx[tid]->session_timer.data =
	263	(unsigned long)&sta->timer_to_tid[tid];
	264	init_timer(&sta->ampdu_mlme.tid_rx[tid]->session_timer);
	265
	266	tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
	267
	268	/* prepare reordering buffer */
	269	tid_agg_rx->reorder_buf =
	270	kcalloc(buf_size, sizeof(struct sk_buff *), GFP_ATOMIC);
	271	if (!tid_agg_rx->reorder_buf) {
	272	#ifdef CONFIG_MAC80211_HT_DEBUG
	273	if (net_ratelimit())
	274	printk(KERN_ERR "can not allocate reordering buffer "
	275	"to tid %d\n", tid);
	276	#endif
	277	kfree(sta->ampdu_mlme.tid_rx[tid]);
	278	goto end;
	279	}
	280
	281	if (local->ops->ampdu_action)
	282	ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_START,
	283	&sta->sta, tid, &start_seq_num);
	284	#ifdef CONFIG_MAC80211_HT_DEBUG
	285	printk(KERN_DEBUG "Rx A-MPDU request on tid %d result %d\n", tid, ret);
	286	#endif /* CONFIG_MAC80211_HT_DEBUG */
	287
	288	if (ret) {
	289	kfree(tid_agg_rx->reorder_buf);
	290	kfree(tid_agg_rx);
	291	sta->ampdu_mlme.tid_rx[tid] = NULL;
	292	goto end;
	293	}
	294
	295	/* change state and send addba resp */
	296	sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_OPERATIONAL;
	297	tid_agg_rx->dialog_token = dialog_token;
	298	tid_agg_rx->ssn = start_seq_num;
	299	tid_agg_rx->head_seq_num = start_seq_num;
	300	tid_agg_rx->buf_size = buf_size;
	301	tid_agg_rx->timeout = timeout;
	302	tid_agg_rx->stored_mpdu_num = 0;
	303	status = WLAN_STATUS_SUCCESS;
	304	end:
	305	spin_unlock_bh(&sta->lock);
	306
	307	end_no_lock:
	308	ieee80211_send_addba_resp(sta->sdata, sta->sta.addr, tid,
	309	dialog_token, status, 1, buf_size, timeout);
	310	}