[deliverable/linux.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 2007-2010, 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/export.h>
#include <net/mac80211.h>
#include "ieee80211_i.h"
#include "rate.h"

bool ieee80111_cfg_override_disables_ht40(struct ieee80211_sub_if_data *sdata)
{
	const __le16 flg = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40);
	if ((sdata->u.mgd.ht_capa_mask.cap_info & flg) &&
	    !(sdata->u.mgd.ht_capa.cap_info & flg))
		return true;
	return false;
}

static void __check_htcap_disable(struct ieee80211_sub_if_data *sdata,
				  struct ieee80211_sta_ht_cap *ht_cap,
				  u16 flag)
{
	__le16 le_flag = cpu_to_le16(flag);
	if (sdata->u.mgd.ht_capa_mask.cap_info & le_flag) {
		if (!(sdata->u.mgd.ht_capa.cap_info & le_flag))
			ht_cap->cap &= ~flag;
	}
}

void ieee80211_apply_htcap_overrides(struct ieee80211_sub_if_data *sdata,
				     struct ieee80211_sta_ht_cap *ht_cap)
{
	u8 *scaps = (u8 *)(&sdata->u.mgd.ht_capa.mcs.rx_mask);
	u8 *smask = (u8 *)(&sdata->u.mgd.ht_capa_mask.mcs.rx_mask);
	int i;

	if (sdata->vif.type != NL80211_IFTYPE_STATION) {
		WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION);
		return;
	}

	/* NOTE:  If you add more over-rides here, update register_hw
	 * ht_capa_mod_msk logic in main.c as well.
	 * And, if this method can ever change ht_cap.ht_supported, fix
	 * the check in ieee80211_add_ht_ie.
	 */

	/* check for HT over-rides, MCS rates first. */
	for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++) {
		u8 m = smask[i];
		ht_cap->mcs.rx_mask[i] &= ~m; /* turn off all masked bits */
		/* Add back rates that are supported */
		ht_cap->mcs.rx_mask[i] |= (m & scaps[i]);
	}

	/* Force removal of HT-40 capabilities? */
	__check_htcap_disable(sdata, ht_cap, IEEE80211_HT_CAP_SUP_WIDTH_20_40);
	__check_htcap_disable(sdata, ht_cap, IEEE80211_HT_CAP_SGI_40);

	/* Allow user to disable the max-AMSDU bit. */
	__check_htcap_disable(sdata, ht_cap, IEEE80211_HT_CAP_MAX_AMSDU);

	/* Allow user to decrease AMPDU factor */
	if (sdata->u.mgd.ht_capa_mask.ampdu_params_info &
	    IEEE80211_HT_AMPDU_PARM_FACTOR) {
		u8 n = sdata->u.mgd.ht_capa.ampdu_params_info
			& IEEE80211_HT_AMPDU_PARM_FACTOR;
		if (n < ht_cap->ampdu_factor)
			ht_cap->ampdu_factor = n;
	}

	/* Allow the user to increase AMPDU density. */
	if (sdata->u.mgd.ht_capa_mask.ampdu_params_info &
	    IEEE80211_HT_AMPDU_PARM_DENSITY) {
		u8 n = (sdata->u.mgd.ht_capa.ampdu_params_info &
			IEEE80211_HT_AMPDU_PARM_DENSITY)
			>> IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT;
		if (n > ht_cap->ampdu_density)
			ht_cap->ampdu_density = n;
	}
}


void ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_sub_if_data *sdata,
				       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 || !sband->ht_cap.ht_supported)
		return;

	ht_cap->ht_supported = true;

	/*
	 * The bits listed in this expression should be
	 * the same for the peer and us, if the station
	 * advertises more then we can't use those thus
	 * we mask them out.
	 */
	ht_cap->cap = le16_to_cpu(ht_cap_ie->cap_info) &
		(sband->ht_cap.cap |
		 ~(IEEE80211_HT_CAP_LDPC_CODING |
		   IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
		   IEEE80211_HT_CAP_GRN_FLD |
		   IEEE80211_HT_CAP_SGI_20 |
		   IEEE80211_HT_CAP_SGI_40 |
		   IEEE80211_HT_CAP_DSSSCCK40));
	/*
	 * The STBC bits are asymmetric -- if we don't have
	 * TX then mask out the peer's RX and vice versa.
	 */
	if (!(sband->ht_cap.cap & IEEE80211_HT_CAP_TX_STBC))
		ht_cap->cap &= ~IEEE80211_HT_CAP_RX_STBC;
	if (!(sband->ht_cap.cap & IEEE80211_HT_CAP_RX_STBC))
		ht_cap->cap &= ~IEEE80211_HT_CAP_TX_STBC;

	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;

	/* Copy peer MCS TX capabilities, the driver might need them. */
	ht_cap->mcs.tx_params = ht_cap_ie->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-2009 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;

	/*
	 * If user has specified capability over-rides, take care
	 * of that here.
	 */
	ieee80211_apply_htcap_overrides(sdata, ht_cap);
}

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

	cancel_work_sync(&sta->ampdu_mlme.work);

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

void ieee80211_ba_session_work(struct work_struct *work)
{
	struct sta_info *sta =
		container_of(work, struct sta_info, ampdu_mlme.work);
	struct tid_ampdu_tx *tid_tx;
	int tid;

	/*
	 * When this flag is set, new sessions should be
	 * blocked, and existing sessions will be torn
	 * down by the code that set the flag, so this
	 * need not run.
	 */
	if (test_sta_flag(sta, WLAN_STA_BLOCK_BA))
		return;

	mutex_lock(&sta->ampdu_mlme.mtx);
	for (tid = 0; tid < STA_TID_NUM; tid++) {
		if (test_and_clear_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired))
			___ieee80211_stop_rx_ba_session(
				sta, tid, WLAN_BACK_RECIPIENT,
				WLAN_REASON_QSTA_TIMEOUT, true);

		if (test_and_clear_bit(tid,
				       sta->ampdu_mlme.tid_rx_stop_requested))
			___ieee80211_stop_rx_ba_session(
				sta, tid, WLAN_BACK_RECIPIENT,
				WLAN_REASON_UNSPECIFIED, true);

		tid_tx = sta->ampdu_mlme.tid_start_tx[tid];
		if (tid_tx) {
			/*
			 * Assign it over to the normal tid_tx array
			 * where it "goes live".
			 */
			spin_lock_bh(&sta->lock);

			sta->ampdu_mlme.tid_start_tx[tid] = NULL;
			/* could there be a race? */
			if (sta->ampdu_mlme.tid_tx[tid])
				kfree(tid_tx);
			else
				ieee80211_assign_tid_tx(sta, tid, tid_tx);
			spin_unlock_bh(&sta->lock);

			ieee80211_tx_ba_session_handle_start(sta, tid);
			continue;
		}

		tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
		if (tid_tx && test_and_clear_bit(HT_AGG_STATE_WANT_STOP,
						 &tid_tx->state))
			___ieee80211_stop_tx_ba_session(sta, tid,
							WLAN_BACK_INITIATOR,
							true);
	}
	mutex_unlock(&sta->ampdu_mlme.mtx);
}

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)
		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 ||
	    sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
		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.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_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0,
					       true);
	else
		__ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_RECIPIENT,
					       true);
}

int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata,
			       enum ieee80211_smps_mode smps, const u8 *da,
			       const u8 *bssid)
{
	struct ieee80211_local *local = sdata->local;
	struct sk_buff *skb;
	struct ieee80211_mgmt *action_frame;

	/* 27 = header + category + action + smps mode */
	skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom);
	if (!skb)
		return -ENOMEM;

	skb_reserve(skb, local->hw.extra_tx_headroom);
	action_frame = (void *)skb_put(skb, 27);
	memcpy(action_frame->da, da, ETH_ALEN);
	memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN);
	memcpy(action_frame->bssid, bssid, ETH_ALEN);
	action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
						  IEEE80211_STYPE_ACTION);
	action_frame->u.action.category = WLAN_CATEGORY_HT;
	action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS;
	switch (smps) {
	case IEEE80211_SMPS_AUTOMATIC:
	case IEEE80211_SMPS_NUM_MODES:
		WARN_ON(1);
	case IEEE80211_SMPS_OFF:
		action_frame->u.action.u.ht_smps.smps_control =
				WLAN_HT_SMPS_CONTROL_DISABLED;
		break;
	case IEEE80211_SMPS_STATIC:
		action_frame->u.action.u.ht_smps.smps_control =
				WLAN_HT_SMPS_CONTROL_STATIC;
		break;
	case IEEE80211_SMPS_DYNAMIC:
		action_frame->u.action.u.ht_smps.smps_control =
				WLAN_HT_SMPS_CONTROL_DYNAMIC;
		break;
	}

	/* we'll do more on status of this frame */
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
	ieee80211_tx_skb(sdata, skb);

	return 0;
}

void ieee80211_request_smps_work(struct work_struct *work)
{
	struct ieee80211_sub_if_data *sdata =
		container_of(work, struct ieee80211_sub_if_data,
			     u.mgd.request_smps_work);

	mutex_lock(&sdata->u.mgd.mtx);
	__ieee80211_request_smps(sdata, sdata->u.mgd.driver_smps_mode);
	mutex_unlock(&sdata->u.mgd.mtx);
}

void ieee80211_request_smps(struct ieee80211_vif *vif,
			    enum ieee80211_smps_mode smps_mode)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);

	if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
		return;

	if (WARN_ON(smps_mode == IEEE80211_SMPS_OFF))
		smps_mode = IEEE80211_SMPS_AUTOMATIC;

	sdata->u.mgd.driver_smps_mode = smps_mode;

	ieee80211_queue_work(&sdata->local->hw,
			     &sdata->u.mgd.request_smps_work);
}
/* this might change ... don't want non-open drivers using it */
EXPORT_SYMBOL_GPL(ieee80211_request_smps);
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>
44d414db JB	8	* Copyright 2007, Michael Wu <flamingice@sourmilk.net>
cfcdbde3	9	* Copyright 2007-2010, Intel Corporation
44d414db JB	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>
bc3b2d7f	17	#include <linux/export.h>
44d414db JB	18	#include <net/mac80211.h>
44d414db JB	19	#include "ieee80211_i.h"
81cb7623	20	#include "rate.h"
44d414db	21
ef96a842 BG	22	bool ieee80111_cfg_override_disables_ht40(struct ieee80211_sub_if_data *sdata)
	23	{
	24	const __le16 flg = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40);
	25	if ((sdata->u.mgd.ht_capa_mask.cap_info & flg) &&
	26	!(sdata->u.mgd.ht_capa.cap_info & flg))
	27	return true;
	28	return false;
	29	}
	30
32dfefac BG	31	static void __check_htcap_disable(struct ieee80211_sub_if_data *sdata,
	32	struct ieee80211_sta_ht_cap *ht_cap,
	33	u16 flag)
ef96a842 BG	34	{
	35	__le16 le_flag = cpu_to_le16(flag);
	36	if (sdata->u.mgd.ht_capa_mask.cap_info & le_flag) {
	37	if (!(sdata->u.mgd.ht_capa.cap_info & le_flag))
	38	ht_cap->cap &= ~flag;
	39	}
	40	}
	41
	42	void ieee80211_apply_htcap_overrides(struct ieee80211_sub_if_data *sdata,
	43	struct ieee80211_sta_ht_cap *ht_cap)
	44	{
	45	u8 scaps = (u8 )(&sdata->u.mgd.ht_capa.mcs.rx_mask);
	46	u8 smask = (u8 )(&sdata->u.mgd.ht_capa_mask.mcs.rx_mask);
	47	int i;
	48
	49	if (sdata->vif.type != NL80211_IFTYPE_STATION) {
	50	WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION);
	51	return;
	52	}
	53
	54	/* NOTE: If you add more over-rides here, update register_hw
	55	* ht_capa_mod_msk logic in main.c as well.
	56	* And, if this method can ever change ht_cap.ht_supported, fix
	57	* the check in ieee80211_add_ht_ie.
	58	*/
	59
	60	/* check for HT over-rides, MCS rates first. */
	61	for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++) {
	62	u8 m = smask[i];
	63	ht_cap->mcs.rx_mask[i] &= ~m; /* turn off all masked bits */
	64	/* Add back rates that are supported */
	65	ht_cap->mcs.rx_mask[i] \|= (m & scaps[i]);
	66	}
	67
	68	/* Force removal of HT-40 capabilities? */
	69	__check_htcap_disable(sdata, ht_cap, IEEE80211_HT_CAP_SUP_WIDTH_20_40);
	70	__check_htcap_disable(sdata, ht_cap, IEEE80211_HT_CAP_SGI_40);
	71
	72	/* Allow user to disable the max-AMSDU bit. */
	73	__check_htcap_disable(sdata, ht_cap, IEEE80211_HT_CAP_MAX_AMSDU);
	74
	75	/* Allow user to decrease AMPDU factor */
	76	if (sdata->u.mgd.ht_capa_mask.ampdu_params_info &
	77	IEEE80211_HT_AMPDU_PARM_FACTOR) {
	78	u8 n = sdata->u.mgd.ht_capa.ampdu_params_info
	79	& IEEE80211_HT_AMPDU_PARM_FACTOR;
	80	if (n < ht_cap->ampdu_factor)
	81	ht_cap->ampdu_factor = n;
	82	}
	83
	84	/* Allow the user to increase AMPDU density. */
	85	if (sdata->u.mgd.ht_capa_mask.ampdu_params_info &
	86	IEEE80211_HT_AMPDU_PARM_DENSITY) {
	87	u8 n = (sdata->u.mgd.ht_capa.ampdu_params_info &
	88	IEEE80211_HT_AMPDU_PARM_DENSITY)
	89	>> IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT;
	90	if (n > ht_cap->ampdu_density)
	91	ht_cap->ampdu_density = n;
	92	}
	93	}
	94
	95
	96	void ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_sub_if_data *sdata,
	97	struct ieee80211_supported_band *sband,
ae5eb026	98	struct ieee80211_ht_cap *ht_cap_ie,
d9fe60de	99	struct ieee80211_sta_ht_cap *ht_cap)
44d414db	100	{
ae5eb026 JB	101	u8 ampdu_info, tx_mcs_set_cap;
ae5eb026 JB	102	int i, max_tx_streams;
44d414db	103
d9fe60de	104	BUG_ON(!ht_cap);
44d414db	105
d9fe60de	106	memset(ht_cap, 0, sizeof(*ht_cap));
44d414db	107
15804e3e	108	if (!ht_cap_ie \|\| !sband->ht_cap.ht_supported)
ae5eb026	109	return;
d9fe60de	110
ae5eb026	111	ht_cap->ht_supported = true;
d9fe60de	112
9a418af5 JB	113	/*
	114	* The bits listed in this expression should be
	115	* the same for the peer and us, if the station
	116	* advertises more then we can't use those thus
	117	* we mask them out.
	118	*/
	119	ht_cap->cap = le16_to_cpu(ht_cap_ie->cap_info) &
	120	(sband->ht_cap.cap \|
	121	~(IEEE80211_HT_CAP_LDPC_CODING \|
	122	IEEE80211_HT_CAP_SUP_WIDTH_20_40 \|
	123	IEEE80211_HT_CAP_GRN_FLD \|
	124	IEEE80211_HT_CAP_SGI_20 \|
	125	IEEE80211_HT_CAP_SGI_40 \|
	126	IEEE80211_HT_CAP_DSSSCCK40));
	127	/*
	128	* The STBC bits are asymmetric -- if we don't have
	129	* TX then mask out the peer's RX and vice versa.
	130	*/
	131	if (!(sband->ht_cap.cap & IEEE80211_HT_CAP_TX_STBC))
	132	ht_cap->cap &= ~IEEE80211_HT_CAP_RX_STBC;
	133	if (!(sband->ht_cap.cap & IEEE80211_HT_CAP_RX_STBC))
	134	ht_cap->cap &= ~IEEE80211_HT_CAP_TX_STBC;
d9fe60de	135
ae5eb026 JB	136	ampdu_info = ht_cap_ie->ampdu_params_info;
	137	ht_cap->ampdu_factor =
	138	ampdu_info & IEEE80211_HT_AMPDU_PARM_FACTOR;
	139	ht_cap->ampdu_density =
	140	(ampdu_info & IEEE80211_HT_AMPDU_PARM_DENSITY) >> 2;
44d414db	141
d9fe60de JB	142	/* own MCS TX capabilities */
	143	tx_mcs_set_cap = sband->ht_cap.mcs.tx_params;
	144
90b4ca9d JB	145	/* Copy peer MCS TX capabilities, the driver might need them. */
	146	ht_cap->mcs.tx_params = ht_cap_ie->mcs.tx_params;
	147
d9fe60de JB	148	/* can we TX with MCS rates? */
d9fe60de JB	149	if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED))
ae5eb026	150	return;
d9fe60de JB	151
	152	/* Counting from 0, therefore +1 */
	153	if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF)
	154	max_tx_streams =
	155	((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
	156	>> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
	157	else
	158	max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS;
	159
	160	/*
90b4ca9d	161	* 802.11n-2009 20.3.5 / 20.6 says:
d9fe60de JB	162	* - indices 0 to 7 and 32 are single spatial stream
	163	* - 8 to 31 are multiple spatial streams using equal modulation
	164	* [8..15 for two streams, 16..23 for three and 24..31 for four]
	165	* - remainder are multiple spatial streams using unequal modulation
	166	*/
	167	for (i = 0; i < max_tx_streams; i++)
ae5eb026 JB	168	ht_cap->mcs.rx_mask[i] =
ae5eb026 JB	169	sband->ht_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i];
d9fe60de JB	170
	171	if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION)
	172	for (i = IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE;
	173	i < IEEE80211_HT_MCS_MASK_LEN; i++)
ae5eb026	174	ht_cap->mcs.rx_mask[i] =
d9fe60de	175	sband->ht_cap.mcs.rx_mask[i] &
ae5eb026	176	ht_cap_ie->mcs.rx_mask[i];
d9fe60de JB	177
d9fe60de JB	178	/* handle MCS rate 32 too */
ae5eb026 JB	179	if (sband->ht_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1)
ae5eb026 JB	180	ht_cap->mcs.rx_mask[32/8] \|= 1;
ef96a842 BG	181
	182	/*
	183	* If user has specified capability over-rides, take care
	184	* of that here.
	185	*/
	186	ieee80211_apply_htcap_overrides(sdata, ht_cap);
ae5eb026 JB	187	}
ae5eb026 JB	188
53f73c09	189	void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta, bool tx)
de1ede7a	190	{
b8695a8f	191	int i;
de1ede7a	192
0ab33703 JB	193	cancel_work_sync(&sta->ampdu_mlme.work);
0ab33703 JB	194
b8695a8f	195	for (i = 0; i < STA_TID_NUM; i++) {
53f73c09	196	__ieee80211_stop_tx_ba_session(sta, i, WLAN_BACK_INITIATOR, tx);
849b7967	197	__ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT,
53f73c09	198	WLAN_REASON_QSTA_LEAVE_QBSS, tx);
de1ede7a	199	}
de1ede7a JB	200	}
de1ede7a JB	201
67c282c0 JB	202	void ieee80211_ba_session_work(struct work_struct *work)
	203	{
	204	struct sta_info *sta =
	205	container_of(work, struct sta_info, ampdu_mlme.work);
	206	struct tid_ampdu_tx *tid_tx;
	207	int tid;
	208
	209	/*
	210	* When this flag is set, new sessions should be
	211	* blocked, and existing sessions will be torn
	212	* down by the code that set the flag, so this
	213	* need not run.
	214	*/
c2c98fde	215	if (test_sta_flag(sta, WLAN_STA_BLOCK_BA))
67c282c0 JB	216	return;
67c282c0 JB	217
a93e3644	218	mutex_lock(&sta->ampdu_mlme.mtx);
67c282c0	219	for (tid = 0; tid < STA_TID_NUM; tid++) {
7c3b1dd8 JB	220	if (test_and_clear_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired))
	221	___ieee80211_stop_rx_ba_session(
	222	sta, tid, WLAN_BACK_RECIPIENT,
53f73c09	223	WLAN_REASON_QSTA_TIMEOUT, true);
7c3b1dd8	224
f41ccd71 SL	225	if (test_and_clear_bit(tid,
	226	sta->ampdu_mlme.tid_rx_stop_requested))
	227	___ieee80211_stop_rx_ba_session(
	228	sta, tid, WLAN_BACK_RECIPIENT,
	229	WLAN_REASON_UNSPECIFIED, true);
	230
ec034b20 JB	231	tid_tx = sta->ampdu_mlme.tid_start_tx[tid];
	232	if (tid_tx) {
	233	/*
	234	* Assign it over to the normal tid_tx array
	235	* where it "goes live".
	236	*/
	237	spin_lock_bh(&sta->lock);
	238
	239	sta->ampdu_mlme.tid_start_tx[tid] = NULL;
	240	/* could there be a race? */
	241	if (sta->ampdu_mlme.tid_tx[tid])
	242	kfree(tid_tx);
	243	else
	244	ieee80211_assign_tid_tx(sta, tid, tid_tx);
	245	spin_unlock_bh(&sta->lock);
67c282c0	246
67c282c0	247	ieee80211_tx_ba_session_handle_start(sta, tid);
ec034b20 JB	248	continue;
	249	}
	250
40b275b6	251	tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
ec034b20 JB	252	if (tid_tx && test_and_clear_bit(HT_AGG_STATE_WANT_STOP,
ec034b20 JB	253	&tid_tx->state))
67c282c0	254	___ieee80211_stop_tx_ba_session(sta, tid,
53f73c09 JB	255	WLAN_BACK_INITIATOR,
53f73c09 JB	256	true);
67c282c0	257	}
cfcdbde3	258	mutex_unlock(&sta->ampdu_mlme.mtx);
67c282c0 JB	259	}
67c282c0 JB	260
b8695a8f JB	261	void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
	262	const u8 *da, u16 tid,
	263	u16 initiator, u16 reason_code)
44d414db JB	264	{
44d414db JB	265	struct ieee80211_local *local = sdata->local;
44d414db JB	266	struct sk_buff *skb;
	267	struct ieee80211_mgmt *mgmt;
	268	u16 params;
	269
	270	skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
d15b8459	271	if (!skb)
44d414db	272	return;
44d414db JB	273
	274	skb_reserve(skb, local->hw.extra_tx_headroom);
	275	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
	276	memset(mgmt, 0, 24);
	277	memcpy(mgmt->da, da, ETH_ALEN);
47846c9b	278	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
8abd3f9b	279	if (sdata->vif.type == NL80211_IFTYPE_AP \|\|
ae2772b3 TP	280	sdata->vif.type == NL80211_IFTYPE_AP_VLAN \|\|
ae2772b3 TP	281	sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
47846c9b	282	memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
46900298 JB	283	else if (sdata->vif.type == NL80211_IFTYPE_STATION)
	284	memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
	285
44d414db JB	286	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT \|
	287	IEEE80211_STYPE_ACTION);
	288
	289	skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
	290
	291	mgmt->u.action.category = WLAN_CATEGORY_BACK;
	292	mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
	293	params = (u16)(initiator << 11); /* bit 11 initiator */
	294	params \|= (u16)(tid << 12); /* bit 15:12 TID number */
	295
	296	mgmt->u.action.u.delba.params = cpu_to_le16(params);
	297	mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
	298
62ae67be	299	ieee80211_tx_skb(sdata, skb);
44d414db JB	300	}
44d414db JB	301
de1ede7a JB	302	void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
	303	struct sta_info *sta,
	304	struct ieee80211_mgmt *mgmt, size_t len)
	305	{
de1ede7a JB	306	u16 tid, params;
de1ede7a JB	307	u16 initiator;
de1ede7a JB	308
	309	params = le16_to_cpu(mgmt->u.action.u.delba.params);
	310	tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
	311	initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
	312
	313	#ifdef CONFIG_MAC80211_HT_DEBUG
	314	if (net_ratelimit())
0c68ae26 JB	315	printk(KERN_DEBUG "delba from %pM (%s) tid %d reason code %d\n",
0c68ae26 JB	316	mgmt->sa, initiator ? "initiator" : "recipient", tid,
372362ad	317	le16_to_cpu(mgmt->u.action.u.delba.reason_code));
de1ede7a JB	318	#endif /* CONFIG_MAC80211_HT_DEBUG */
	319
	320	if (initiator == WLAN_BACK_INITIATOR)
53f73c09 JB	321	__ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0,
53f73c09 JB	322	true);
a622ab72	323	else
53f73c09 JB	324	__ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_RECIPIENT,
53f73c09 JB	325	true);
de1ede7a	326	}
0f78231b JB	327
	328	int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata,
	329	enum ieee80211_smps_mode smps, const u8 *da,
	330	const u8 *bssid)
	331	{
	332	struct ieee80211_local *local = sdata->local;
	333	struct sk_buff *skb;
	334	struct ieee80211_mgmt *action_frame;
	335
	336	/* 27 = header + category + action + smps mode */
	337	skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom);
	338	if (!skb)
	339	return -ENOMEM;
	340
	341	skb_reserve(skb, local->hw.extra_tx_headroom);
	342	action_frame = (void *)skb_put(skb, 27);
	343	memcpy(action_frame->da, da, ETH_ALEN);
	344	memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN);
	345	memcpy(action_frame->bssid, bssid, ETH_ALEN);
	346	action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT \|
	347	IEEE80211_STYPE_ACTION);
	348	action_frame->u.action.category = WLAN_CATEGORY_HT;
	349	action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS;
	350	switch (smps) {
	351	case IEEE80211_SMPS_AUTOMATIC:
	352	case IEEE80211_SMPS_NUM_MODES:
	353	WARN_ON(1);
	354	case IEEE80211_SMPS_OFF:
	355	action_frame->u.action.u.ht_smps.smps_control =
	356	WLAN_HT_SMPS_CONTROL_DISABLED;
	357	break;
	358	case IEEE80211_SMPS_STATIC:
	359	action_frame->u.action.u.ht_smps.smps_control =
	360	WLAN_HT_SMPS_CONTROL_STATIC;
	361	break;
	362	case IEEE80211_SMPS_DYNAMIC:
	363	action_frame->u.action.u.ht_smps.smps_control =
	364	WLAN_HT_SMPS_CONTROL_DYNAMIC;
	365	break;
	366	}
	367
	368	/* we'll do more on status of this frame */
	369	IEEE80211_SKB_CB(skb)->flags \|= IEEE80211_TX_CTL_REQ_TX_STATUS;
	370	ieee80211_tx_skb(sdata, skb);
	371
	372	return 0;
	373	}
d1f5b7a3 JB	374
	375	void ieee80211_request_smps_work(struct work_struct *work)
	376	{
	377	struct ieee80211_sub_if_data *sdata =
	378	container_of(work, struct ieee80211_sub_if_data,
	379	u.mgd.request_smps_work);
	380
	381	mutex_lock(&sdata->u.mgd.mtx);
	382	__ieee80211_request_smps(sdata, sdata->u.mgd.driver_smps_mode);
	383	mutex_unlock(&sdata->u.mgd.mtx);
	384	}
	385
	386	void ieee80211_request_smps(struct ieee80211_vif *vif,
	387	enum ieee80211_smps_mode smps_mode)
	388	{
	389	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
	390
	391	if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
	392	return;
	393
	394	if (WARN_ON(smps_mode == IEEE80211_SMPS_OFF))
	395	smps_mode = IEEE80211_SMPS_AUTOMATIC;
	396
e4b55957 JB	397	sdata->u.mgd.driver_smps_mode = smps_mode;
e4b55957 JB	398
d1f5b7a3 JB	399	ieee80211_queue_work(&sdata->local->hw,
	400	&sdata->u.mgd.request_smps_work);
	401	}
	402	/* this might change ... don't want non-open drivers using it */
	403	EXPORT_SYMBOL_GPL(ieee80211_request_smps);