[linux-2.6-block.git] / net / mac80211 / ht.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 "rate.h"

void ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_supported_band *sband,
				       struct ieee80211_ht_cap *ht_cap_ie,
				       struct ieee80211_sta_ht_cap *ht_cap)
{
	u8 ampdu_info, tx_mcs_set_cap;
	int i, max_tx_streams;

	BUG_ON(!ht_cap);

	memset(ht_cap, 0, sizeof(*ht_cap));

	if (!ht_cap_ie)
		return;

	ht_cap->ht_supported = true;

	ht_cap->cap = le16_to_cpu(ht_cap_ie->cap_info) & sband->ht_cap.cap;
	ht_cap->cap &= ~IEEE80211_HT_CAP_SM_PS;
	ht_cap->cap |= sband->ht_cap.cap & IEEE80211_HT_CAP_SM_PS;

	ampdu_info = ht_cap_ie->ampdu_params_info;
	ht_cap->ampdu_factor =
		ampdu_info & IEEE80211_HT_AMPDU_PARM_FACTOR;
	ht_cap->ampdu_density =
		(ampdu_info & IEEE80211_HT_AMPDU_PARM_DENSITY) >> 2;

	/* own MCS TX capabilities */
	tx_mcs_set_cap = sband->ht_cap.mcs.tx_params;

	/* can we TX with MCS rates? */
	if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED))
		return;

	/* Counting from 0, therefore +1 */
	if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF)
		max_tx_streams =
			((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
				>> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
	else
		max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS;

	/*
	 * 802.11n D5.0 20.3.5 / 20.6 says:
	 * - indices 0 to 7 and 32 are single spatial stream
	 * - 8 to 31 are multiple spatial streams using equal modulation
	 *   [8..15 for two streams, 16..23 for three and 24..31 for four]
	 * - remainder are multiple spatial streams using unequal modulation
	 */
	for (i = 0; i < max_tx_streams; i++)
		ht_cap->mcs.rx_mask[i] =
			sband->ht_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i];

	if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION)
		for (i = IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE;
		     i < IEEE80211_HT_MCS_MASK_LEN; i++)
			ht_cap->mcs.rx_mask[i] =
				sband->ht_cap.mcs.rx_mask[i] &
					ht_cap_ie->mcs.rx_mask[i];

	/* handle MCS rate 32 too */
	if (sband->ht_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1)
		ht_cap->mcs.rx_mask[32/8] |= 1;
}

void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta)
{
	int i;

	for (i = 0; i <  STA_TID_NUM; i++) {
		__ieee80211_stop_tx_ba_session(sta, i, WLAN_BACK_INITIATOR);
		__ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT,
					       WLAN_REASON_QSTA_LEAVE_QBSS);
	}
}

void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
			  const u8 *da, u16 tid,
			  u16 initiator, u16 reason_code)
{
	struct ieee80211_local *local = sdata->local;
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
	u16 params;

	skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);

	if (!skb) {
		printk(KERN_ERR "%s: failed to allocate buffer "
					"for delba 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.delba));

	mgmt->u.action.category = WLAN_CATEGORY_BACK;
	mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
	params = (u16)(initiator << 11); 	/* bit 11 initiator */
	params |= (u16)(tid << 12); 		/* bit 15:12 TID number */

	mgmt->u.action.u.delba.params = cpu_to_le16(params);
	mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);

	ieee80211_tx_skb(sdata, skb);
}

void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
			     struct sta_info *sta,
			     struct ieee80211_mgmt *mgmt, size_t len)
{
	u16 tid, params;
	u16 initiator;

	params = le16_to_cpu(mgmt->u.action.u.delba.params);
	tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
	initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;

#ifdef CONFIG_MAC80211_HT_DEBUG
	if (net_ratelimit())
		printk(KERN_DEBUG "delba from %pM (%s) tid %d reason code %d\n",
			mgmt->sa, initiator ? "initiator" : "recipient", tid,
			le16_to_cpu(mgmt->u.action.u.delba.reason_code));
#endif /* CONFIG_MAC80211_HT_DEBUG */

	if (initiator == WLAN_BACK_INITIATOR)
		ieee80211_sta_stop_rx_ba_session(sdata, sta->sta.addr, tid,
						 WLAN_BACK_INITIATOR, 0);
	else { /* WLAN_BACK_RECIPIENT */
		spin_lock_bh(&sta->lock);
		if (sta->ampdu_mlme.tid_state_tx[tid] & HT_ADDBA_REQUESTED_MSK)
			___ieee80211_stop_tx_ba_session(sta, tid,
							WLAN_BACK_RECIPIENT);
		spin_unlock_bh(&sta->lock);
	}
}
Commit	Line	Data
44d414db JB	1	/*
	2	* HT handling
	3	*
	4	* Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
bacac545 JB	5	* Copyright 2002-2005, Instant802 Networks, Inc.
bacac545 JB	6	* Copyright 2005-2006, Devicescape Software, Inc.
44d414db JB	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>
44d414db JB	17	#include <net/mac80211.h>
44d414db JB	18	#include "ieee80211_i.h"
81cb7623	19	#include "rate.h"
44d414db	20
ae5eb026 JB	21	void ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_supported_band *sband,
ae5eb026 JB	22	struct ieee80211_ht_cap *ht_cap_ie,
d9fe60de	23	struct ieee80211_sta_ht_cap *ht_cap)
44d414db	24	{
ae5eb026 JB	25	u8 ampdu_info, tx_mcs_set_cap;
ae5eb026 JB	26	int i, max_tx_streams;
44d414db	27
d9fe60de	28	BUG_ON(!ht_cap);
44d414db	29
d9fe60de	30	memset(ht_cap, 0, sizeof(*ht_cap));
44d414db	31
ae5eb026 JB	32	if (!ht_cap_ie)
ae5eb026 JB	33	return;
d9fe60de	34
ae5eb026	35	ht_cap->ht_supported = true;
d9fe60de	36
f16f33df	37	ht_cap->cap = le16_to_cpu(ht_cap_ie->cap_info) & sband->ht_cap.cap;
ae5eb026 JB	38	ht_cap->cap &= ~IEEE80211_HT_CAP_SM_PS;
ae5eb026 JB	39	ht_cap->cap \|= sband->ht_cap.cap & IEEE80211_HT_CAP_SM_PS;
d9fe60de	40
ae5eb026 JB	41	ampdu_info = ht_cap_ie->ampdu_params_info;
	42	ht_cap->ampdu_factor =
	43	ampdu_info & IEEE80211_HT_AMPDU_PARM_FACTOR;
	44	ht_cap->ampdu_density =
	45	(ampdu_info & IEEE80211_HT_AMPDU_PARM_DENSITY) >> 2;
44d414db	46
d9fe60de JB	47	/* own MCS TX capabilities */
	48	tx_mcs_set_cap = sband->ht_cap.mcs.tx_params;
	49
d9fe60de JB	50	/* can we TX with MCS rates? */
d9fe60de JB	51	if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED))
ae5eb026	52	return;
d9fe60de JB	53
	54	/* Counting from 0, therefore +1 */
	55	if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF)
	56	max_tx_streams =
	57	((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
	58	>> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
	59	else
	60	max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS;
	61
	62	/*
	63	* 802.11n D5.0 20.3.5 / 20.6 says:
	64	* - indices 0 to 7 and 32 are single spatial stream
	65	* - 8 to 31 are multiple spatial streams using equal modulation
	66	* [8..15 for two streams, 16..23 for three and 24..31 for four]
	67	* - remainder are multiple spatial streams using unequal modulation
	68	*/
	69	for (i = 0; i < max_tx_streams; i++)
ae5eb026 JB	70	ht_cap->mcs.rx_mask[i] =
ae5eb026 JB	71	sband->ht_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i];
d9fe60de JB	72
	73	if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION)
	74	for (i = IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE;
	75	i < IEEE80211_HT_MCS_MASK_LEN; i++)
ae5eb026	76	ht_cap->mcs.rx_mask[i] =
d9fe60de	77	sband->ht_cap.mcs.rx_mask[i] &
ae5eb026	78	ht_cap_ie->mcs.rx_mask[i];
d9fe60de JB	79
d9fe60de JB	80	/* handle MCS rate 32 too */
ae5eb026 JB	81	if (sband->ht_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1)
	82	ht_cap->mcs.rx_mask[32/8] \|= 1;
	83	}
	84
2dace10e	85	void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta)
de1ede7a	86	{
b8695a8f	87	int i;
de1ede7a	88
b8695a8f	89	for (i = 0; i < STA_TID_NUM; i++) {
849b7967 JB	90	__ieee80211_stop_tx_ba_session(sta, i, WLAN_BACK_INITIATOR);
	91	__ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT,
	92	WLAN_REASON_QSTA_LEAVE_QBSS);
de1ede7a	93	}
de1ede7a JB	94	}
de1ede7a JB	95
b8695a8f JB	96	void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
	97	const u8 *da, u16 tid,
	98	u16 initiator, u16 reason_code)
44d414db JB	99	{
44d414db JB	100	struct ieee80211_local *local = sdata->local;
44d414db JB	101	struct sk_buff *skb;
	102	struct ieee80211_mgmt *mgmt;
	103	u16 params;
	104
	105	skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
	106
	107	if (!skb) {
	108	printk(KERN_ERR "%s: failed to allocate buffer "
	109	"for delba frame\n", sdata->dev->name);
	110	return;
	111	}
	112
	113	skb_reserve(skb, local->hw.extra_tx_headroom);
	114	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
	115	memset(mgmt, 0, 24);
	116	memcpy(mgmt->da, da, ETH_ALEN);
	117	memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
8abd3f9b JB	118	if (sdata->vif.type == NL80211_IFTYPE_AP \|\|
8abd3f9b JB	119	sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
44d414db	120	memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
46900298 JB	121	else if (sdata->vif.type == NL80211_IFTYPE_STATION)
	122	memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
	123
44d414db JB	124	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT \|
	125	IEEE80211_STYPE_ACTION);
	126
	127	skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
	128
	129	mgmt->u.action.category = WLAN_CATEGORY_BACK;
	130	mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
	131	params = (u16)(initiator << 11); /* bit 11 initiator */
	132	params \|= (u16)(tid << 12); /* bit 15:12 TID number */
	133
	134	mgmt->u.action.u.delba.params = cpu_to_le16(params);
	135	mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
	136
62ae67be	137	ieee80211_tx_skb(sdata, skb);
44d414db JB	138	}
44d414db JB	139
de1ede7a JB	140	void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
	141	struct sta_info *sta,
	142	struct ieee80211_mgmt *mgmt, size_t len)
	143	{
de1ede7a JB	144	u16 tid, params;
de1ede7a JB	145	u16 initiator;
de1ede7a JB	146
	147	params = le16_to_cpu(mgmt->u.action.u.delba.params);
	148	tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
	149	initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
	150
	151	#ifdef CONFIG_MAC80211_HT_DEBUG
	152	if (net_ratelimit())
0c68ae26 JB	153	printk(KERN_DEBUG "delba from %pM (%s) tid %d reason code %d\n",
0c68ae26 JB	154	mgmt->sa, initiator ? "initiator" : "recipient", tid,
372362ad	155	le16_to_cpu(mgmt->u.action.u.delba.reason_code));
de1ede7a JB	156	#endif /* CONFIG_MAC80211_HT_DEBUG */
	157
	158	if (initiator == WLAN_BACK_INITIATOR)
17741cdc	159	ieee80211_sta_stop_rx_ba_session(sdata, sta->sta.addr, tid,
de1ede7a JB	160	WLAN_BACK_INITIATOR, 0);
	161	else { /* WLAN_BACK_RECIPIENT */
	162	spin_lock_bh(&sta->lock);
827d42c9 JB	163	if (sta->ampdu_mlme.tid_state_tx[tid] & HT_ADDBA_REQUESTED_MSK)
	164	___ieee80211_stop_tx_ba_session(sta, tid,
	165	WLAN_BACK_RECIPIENT);
de1ede7a	166	spin_unlock_bh(&sta->lock);
de1ede7a JB	167	}
de1ede7a JB	168	}