net/mac80211/ht.c - arm/linux - Git at Google

 /*
  * 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/wireless.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;
 }

 /*
  * ieee80211_enable_ht should be called only after the operating band
  * has been determined as ht configuration depends on the hw's
  * HT abilities for a specific band.
  */
 u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
 			struct ieee80211_ht_info *hti,
 			u16 ap_ht_cap_flags)
 {
 	struct ieee80211_local *local = sdata->local;
 	struct ieee80211_supported_band *sband;
 	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
 	struct ieee80211_bss_ht_conf ht;
 	struct sta_info *sta;
 	u32 changed = 0;
 	bool enable_ht = true, ht_changed;
 	enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;

 	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];

 	memset(&ht, 0, sizeof(ht));

 	/* HT is not supported */
 	if (!sband->ht_cap.ht_supported)
 		enable_ht = false;

 	/* check that channel matches the right operating channel */
 	if (local->hw.conf.channel->center_freq !=
 	    ieee80211_channel_to_frequency(hti->control_chan))
 		enable_ht = false;

 	if (enable_ht) {
 		channel_type = NL80211_CHAN_HT20;

 		if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
 		    (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
 		    (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
 			switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
 			case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
 				channel_type = NL80211_CHAN_HT40PLUS;
 				break;
 			case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
 				channel_type = NL80211_CHAN_HT40MINUS;
 				break;
 			}
 		}
 	}

 	ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
 		     channel_type != local->hw.conf.channel_type;

 	local->oper_channel_type = channel_type;

 	if (ht_changed) {
                 /* channel_type change automatically detected */
 		ieee80211_hw_config(local, 0);

 		rcu_read_lock();

 		sta = sta_info_get(local, ifmgd->bssid);
 		if (sta)
 			rate_control_rate_update(local, sband, sta,
 						 IEEE80211_RC_HT_CHANGED);

 		rcu_read_unlock();

         }

 	/* disable HT */
 	if (!enable_ht)
 		return 0;

 	ht.operation_mode = le16_to_cpu(hti->operation_mode);

 	/* if bss configuration changed store the new one */
 	if (memcmp(&sdata->vif.bss_conf.ht, &ht, sizeof(ht))) {
 		changed |= BSS_CHANGED_HT;
 		sdata->vif.bss_conf.ht = ht;
 	}

 	return changed;
 }

 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, 1);
 }

 void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
 			     struct sta_info *sta,
 			     struct ieee80211_mgmt *mgmt, size_t len)
 {
 	struct ieee80211_local *local = sdata->local;
 	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,
 			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);
 		sta->ampdu_mlme.tid_state_tx[tid] =
 				HT_AGG_STATE_OPERATIONAL;
 		spin_unlock_bh(&sta->lock);
 		ieee80211_stop_tx_ba_session(&local->hw, sta->sta.addr, tid,
 					     WLAN_BACK_RECIPIENT);
 	}
 }
	/*
	* 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/wireless.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;
	}

	/*
	* ieee80211_enable_ht should be called only after the operating band
	* has been determined as ht configuration depends on the hw's
	* HT abilities for a specific band.
	*/
	u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
	struct ieee80211_ht_info *hti,
	u16 ap_ht_cap_flags)
	{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_supported_band *sband;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct ieee80211_bss_ht_conf ht;
	struct sta_info *sta;
	u32 changed = 0;
	bool enable_ht = true, ht_changed;
	enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;

	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];

	memset(&ht, 0, sizeof(ht));

	/* HT is not supported */
	if (!sband->ht_cap.ht_supported)
	enable_ht = false;

	/* check that channel matches the right operating channel */
	if (local->hw.conf.channel->center_freq !=
	ieee80211_channel_to_frequency(hti->control_chan))
	enable_ht = false;

	if (enable_ht) {
	channel_type = NL80211_CHAN_HT20;

	if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
	(sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
	(hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
	switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
	case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
	channel_type = NL80211_CHAN_HT40PLUS;
	break;
	case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
	channel_type = NL80211_CHAN_HT40MINUS;
	break;
	}
	}
	}

	ht_changed = conf_is_ht(&local->hw.conf) != enable_ht \|\|
	channel_type != local->hw.conf.channel_type;

	local->oper_channel_type = channel_type;

	if (ht_changed) {
	/* channel_type change automatically detected */
	ieee80211_hw_config(local, 0);

	rcu_read_lock();

	sta = sta_info_get(local, ifmgd->bssid);
	if (sta)
	rate_control_rate_update(local, sband, sta,
	IEEE80211_RC_HT_CHANGED);

	rcu_read_unlock();

	}

	/* disable HT */
	if (!enable_ht)
	return 0;

	ht.operation_mode = le16_to_cpu(hti->operation_mode);

	/* if bss configuration changed store the new one */
	if (memcmp(&sdata->vif.bss_conf.ht, &ht, sizeof(ht))) {
	changed \|= BSS_CHANGED_HT;
	sdata->vif.bss_conf.ht = ht;
	}

	return changed;
	}

	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, 1);
	}

	void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
	struct sta_info *sta,
	struct ieee80211_mgmt *mgmt, size_t len)
	{
	struct ieee80211_local *local = sdata->local;
	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,
	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);
	sta->ampdu_mlme.tid_state_tx[tid] =
	HT_AGG_STATE_OPERATIONAL;
	spin_unlock_bh(&sta->lock);
	ieee80211_stop_tx_ba_session(&local->hw, sta->sta.addr, tid,
	WLAN_BACK_RECIPIENT);
	}
	}