[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"

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) {
		/* AP interfaces call this code when adding new stations,
		 * so just silently ignore non station interfaces.
		 */
		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);
	else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
		memcpy(mgmt->bssid, sdata->u.ibss.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_tid(sdata, skb, tid);
}

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
	net_dbg_ratelimited("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
32dfefac BG	22	static void __check_htcap_disable(struct ieee80211_sub_if_data *sdata,
	23	struct ieee80211_sta_ht_cap *ht_cap,
	24	u16 flag)
ef96a842 BG	25	{
	26	__le16 le_flag = cpu_to_le16(flag);
	27	if (sdata->u.mgd.ht_capa_mask.cap_info & le_flag) {
	28	if (!(sdata->u.mgd.ht_capa.cap_info & le_flag))
	29	ht_cap->cap &= ~flag;
	30	}
	31	}
	32
	33	void ieee80211_apply_htcap_overrides(struct ieee80211_sub_if_data *sdata,
	34	struct ieee80211_sta_ht_cap *ht_cap)
	35	{
	36	u8 scaps = (u8 )(&sdata->u.mgd.ht_capa.mcs.rx_mask);
	37	u8 smask = (u8 )(&sdata->u.mgd.ht_capa_mask.mcs.rx_mask);
	38	int i;
	39
	40	if (sdata->vif.type != NL80211_IFTYPE_STATION) {
4e79fada BG	41	/* AP interfaces call this code when adding new stations,
	42	* so just silently ignore non station interfaces.
	43	*/
ef96a842 BG	44	return;
	45	}
	46
	47	/* NOTE: If you add more over-rides here, update register_hw
	48	* ht_capa_mod_msk logic in main.c as well.
	49	* And, if this method can ever change ht_cap.ht_supported, fix
	50	* the check in ieee80211_add_ht_ie.
	51	*/
	52
	53	/* check for HT over-rides, MCS rates first. */
	54	for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++) {
	55	u8 m = smask[i];
	56	ht_cap->mcs.rx_mask[i] &= ~m; /* turn off all masked bits */
	57	/* Add back rates that are supported */
	58	ht_cap->mcs.rx_mask[i] \|= (m & scaps[i]);
	59	}
	60
	61	/* Force removal of HT-40 capabilities? */
	62	__check_htcap_disable(sdata, ht_cap, IEEE80211_HT_CAP_SUP_WIDTH_20_40);
	63	__check_htcap_disable(sdata, ht_cap, IEEE80211_HT_CAP_SGI_40);
	64
	65	/* Allow user to disable the max-AMSDU bit. */
	66	__check_htcap_disable(sdata, ht_cap, IEEE80211_HT_CAP_MAX_AMSDU);
	67
	68	/* Allow user to decrease AMPDU factor */
	69	if (sdata->u.mgd.ht_capa_mask.ampdu_params_info &
	70	IEEE80211_HT_AMPDU_PARM_FACTOR) {
	71	u8 n = sdata->u.mgd.ht_capa.ampdu_params_info
	72	& IEEE80211_HT_AMPDU_PARM_FACTOR;
	73	if (n < ht_cap->ampdu_factor)
	74	ht_cap->ampdu_factor = n;
	75	}
	76
	77	/* Allow the user to increase AMPDU density. */
	78	if (sdata->u.mgd.ht_capa_mask.ampdu_params_info &
	79	IEEE80211_HT_AMPDU_PARM_DENSITY) {
	80	u8 n = (sdata->u.mgd.ht_capa.ampdu_params_info &
	81	IEEE80211_HT_AMPDU_PARM_DENSITY)
	82	>> IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT;
	83	if (n > ht_cap->ampdu_density)
	84	ht_cap->ampdu_density = n;
	85	}
	86	}
	87
	88
	89	void ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_sub_if_data *sdata,
	90	struct ieee80211_supported_band *sband,
ae5eb026	91	struct ieee80211_ht_cap *ht_cap_ie,
d9fe60de	92	struct ieee80211_sta_ht_cap *ht_cap)
44d414db	93	{
ae5eb026 JB	94	u8 ampdu_info, tx_mcs_set_cap;
ae5eb026 JB	95	int i, max_tx_streams;
44d414db	96
d9fe60de	97	BUG_ON(!ht_cap);
44d414db	98
d9fe60de	99	memset(ht_cap, 0, sizeof(*ht_cap));
44d414db	100
15804e3e	101	if (!ht_cap_ie \|\| !sband->ht_cap.ht_supported)
ae5eb026	102	return;
d9fe60de	103
ae5eb026	104	ht_cap->ht_supported = true;
d9fe60de	105
9a418af5 JB	106	/*
	107	* The bits listed in this expression should be
	108	* the same for the peer and us, if the station
	109	* advertises more then we can't use those thus
	110	* we mask them out.
	111	*/
	112	ht_cap->cap = le16_to_cpu(ht_cap_ie->cap_info) &
	113	(sband->ht_cap.cap \|
	114	~(IEEE80211_HT_CAP_LDPC_CODING \|
	115	IEEE80211_HT_CAP_SUP_WIDTH_20_40 \|
	116	IEEE80211_HT_CAP_GRN_FLD \|
	117	IEEE80211_HT_CAP_SGI_20 \|
	118	IEEE80211_HT_CAP_SGI_40 \|
	119	IEEE80211_HT_CAP_DSSSCCK40));
	120	/*
	121	* The STBC bits are asymmetric -- if we don't have
	122	* TX then mask out the peer's RX and vice versa.
	123	*/
	124	if (!(sband->ht_cap.cap & IEEE80211_HT_CAP_TX_STBC))
	125	ht_cap->cap &= ~IEEE80211_HT_CAP_RX_STBC;
	126	if (!(sband->ht_cap.cap & IEEE80211_HT_CAP_RX_STBC))
	127	ht_cap->cap &= ~IEEE80211_HT_CAP_TX_STBC;
d9fe60de	128
ae5eb026 JB	129	ampdu_info = ht_cap_ie->ampdu_params_info;
	130	ht_cap->ampdu_factor =
	131	ampdu_info & IEEE80211_HT_AMPDU_PARM_FACTOR;
	132	ht_cap->ampdu_density =
	133	(ampdu_info & IEEE80211_HT_AMPDU_PARM_DENSITY) >> 2;
44d414db	134
d9fe60de JB	135	/* own MCS TX capabilities */
	136	tx_mcs_set_cap = sband->ht_cap.mcs.tx_params;
	137
90b4ca9d JB	138	/* Copy peer MCS TX capabilities, the driver might need them. */
	139	ht_cap->mcs.tx_params = ht_cap_ie->mcs.tx_params;
	140
d9fe60de JB	141	/* can we TX with MCS rates? */
d9fe60de JB	142	if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED))
ae5eb026	143	return;
d9fe60de JB	144
	145	/* Counting from 0, therefore +1 */
	146	if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF)
	147	max_tx_streams =
	148	((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
	149	>> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
	150	else
	151	max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS;
	152
	153	/*
90b4ca9d	154	* 802.11n-2009 20.3.5 / 20.6 says:
d9fe60de JB	155	* - indices 0 to 7 and 32 are single spatial stream
	156	* - 8 to 31 are multiple spatial streams using equal modulation
	157	* [8..15 for two streams, 16..23 for three and 24..31 for four]
	158	* - remainder are multiple spatial streams using unequal modulation
	159	*/
	160	for (i = 0; i < max_tx_streams; i++)
ae5eb026 JB	161	ht_cap->mcs.rx_mask[i] =
ae5eb026 JB	162	sband->ht_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i];
d9fe60de JB	163
	164	if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION)
	165	for (i = IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE;
	166	i < IEEE80211_HT_MCS_MASK_LEN; i++)
ae5eb026	167	ht_cap->mcs.rx_mask[i] =
d9fe60de	168	sband->ht_cap.mcs.rx_mask[i] &
ae5eb026	169	ht_cap_ie->mcs.rx_mask[i];
d9fe60de JB	170
d9fe60de JB	171	/* handle MCS rate 32 too */
ae5eb026 JB	172	if (sband->ht_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1)
ae5eb026 JB	173	ht_cap->mcs.rx_mask[32/8] \|= 1;
ef96a842 BG	174
	175	/*
	176	* If user has specified capability over-rides, take care
	177	* of that here.
	178	*/
	179	ieee80211_apply_htcap_overrides(sdata, ht_cap);
ae5eb026 JB	180	}
ae5eb026 JB	181
53f73c09	182	void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta, bool tx)
de1ede7a	183	{
b8695a8f	184	int i;
de1ede7a	185
0ab33703 JB	186	cancel_work_sync(&sta->ampdu_mlme.work);
0ab33703 JB	187
b8695a8f	188	for (i = 0; i < STA_TID_NUM; i++) {
53f73c09	189	__ieee80211_stop_tx_ba_session(sta, i, WLAN_BACK_INITIATOR, tx);
849b7967	190	__ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT,
53f73c09	191	WLAN_REASON_QSTA_LEAVE_QBSS, tx);
de1ede7a	192	}
de1ede7a JB	193	}
de1ede7a JB	194
67c282c0 JB	195	void ieee80211_ba_session_work(struct work_struct *work)
	196	{
	197	struct sta_info *sta =
	198	container_of(work, struct sta_info, ampdu_mlme.work);
	199	struct tid_ampdu_tx *tid_tx;
	200	int tid;
	201
	202	/*
	203	* When this flag is set, new sessions should be
	204	* blocked, and existing sessions will be torn
	205	* down by the code that set the flag, so this
	206	* need not run.
	207	*/
c2c98fde	208	if (test_sta_flag(sta, WLAN_STA_BLOCK_BA))
67c282c0 JB	209	return;
67c282c0 JB	210
a93e3644	211	mutex_lock(&sta->ampdu_mlme.mtx);
67c282c0	212	for (tid = 0; tid < STA_TID_NUM; tid++) {
7c3b1dd8 JB	213	if (test_and_clear_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired))
	214	___ieee80211_stop_rx_ba_session(
	215	sta, tid, WLAN_BACK_RECIPIENT,
53f73c09	216	WLAN_REASON_QSTA_TIMEOUT, true);
7c3b1dd8	217
f41ccd71 SL	218	if (test_and_clear_bit(tid,
	219	sta->ampdu_mlme.tid_rx_stop_requested))
	220	___ieee80211_stop_rx_ba_session(
	221	sta, tid, WLAN_BACK_RECIPIENT,
	222	WLAN_REASON_UNSPECIFIED, true);
	223
ec034b20 JB	224	tid_tx = sta->ampdu_mlme.tid_start_tx[tid];
	225	if (tid_tx) {
	226	/*
	227	* Assign it over to the normal tid_tx array
	228	* where it "goes live".
	229	*/
	230	spin_lock_bh(&sta->lock);
	231
	232	sta->ampdu_mlme.tid_start_tx[tid] = NULL;
	233	/* could there be a race? */
	234	if (sta->ampdu_mlme.tid_tx[tid])
	235	kfree(tid_tx);
	236	else
	237	ieee80211_assign_tid_tx(sta, tid, tid_tx);
	238	spin_unlock_bh(&sta->lock);
67c282c0	239
67c282c0	240	ieee80211_tx_ba_session_handle_start(sta, tid);
ec034b20 JB	241	continue;
	242	}
	243
40b275b6	244	tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
ec034b20 JB	245	if (tid_tx && test_and_clear_bit(HT_AGG_STATE_WANT_STOP,
ec034b20 JB	246	&tid_tx->state))
67c282c0	247	___ieee80211_stop_tx_ba_session(sta, tid,
53f73c09 JB	248	WLAN_BACK_INITIATOR,
53f73c09 JB	249	true);
67c282c0	250	}
cfcdbde3	251	mutex_unlock(&sta->ampdu_mlme.mtx);
67c282c0 JB	252	}
67c282c0 JB	253
b8695a8f JB	254	void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
	255	const u8 *da, u16 tid,
	256	u16 initiator, u16 reason_code)
44d414db JB	257	{
44d414db JB	258	struct ieee80211_local *local = sdata->local;
44d414db JB	259	struct sk_buff *skb;
	260	struct ieee80211_mgmt *mgmt;
	261	u16 params;
	262
	263	skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
d15b8459	264	if (!skb)
44d414db	265	return;
44d414db JB	266
	267	skb_reserve(skb, local->hw.extra_tx_headroom);
	268	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
	269	memset(mgmt, 0, 24);
	270	memcpy(mgmt->da, da, ETH_ALEN);
47846c9b	271	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
8abd3f9b	272	if (sdata->vif.type == NL80211_IFTYPE_AP \|\|
ae2772b3 TP	273	sdata->vif.type == NL80211_IFTYPE_AP_VLAN \|\|
ae2772b3 TP	274	sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
47846c9b	275	memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
46900298 JB	276	else if (sdata->vif.type == NL80211_IFTYPE_STATION)
46900298 JB	277	memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
13c40c54 AS	278	else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
13c40c54 AS	279	memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN);
46900298	280
44d414db JB	281	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT \|
	282	IEEE80211_STYPE_ACTION);
	283
	284	skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
	285
	286	mgmt->u.action.category = WLAN_CATEGORY_BACK;
	287	mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
	288	params = (u16)(initiator << 11); /* bit 11 initiator */
	289	params \|= (u16)(tid << 12); /* bit 15:12 TID number */
	290
	291	mgmt->u.action.u.delba.params = cpu_to_le16(params);
	292	mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
	293
cf6bb79a	294	ieee80211_tx_skb_tid(sdata, skb, tid);
44d414db JB	295	}
44d414db JB	296
de1ede7a JB	297	void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
	298	struct sta_info *sta,
	299	struct ieee80211_mgmt *mgmt, size_t len)
	300	{
de1ede7a JB	301	u16 tid, params;
de1ede7a JB	302	u16 initiator;
de1ede7a JB	303
	304	params = le16_to_cpu(mgmt->u.action.u.delba.params);
	305	tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
	306	initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
	307
	308	#ifdef CONFIG_MAC80211_HT_DEBUG
e87cc472 JP	309	net_dbg_ratelimited("delba from %pM (%s) tid %d reason code %d\n",
	310	mgmt->sa, initiator ? "initiator" : "recipient",
	311	tid,
	312	le16_to_cpu(mgmt->u.action.u.delba.reason_code));
de1ede7a JB	313	#endif /* CONFIG_MAC80211_HT_DEBUG */
	314
	315	if (initiator == WLAN_BACK_INITIATOR)
53f73c09 JB	316	__ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0,
53f73c09 JB	317	true);
a622ab72	318	else
53f73c09 JB	319	__ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_RECIPIENT,
53f73c09 JB	320	true);
de1ede7a	321	}
0f78231b JB	322
	323	int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata,
	324	enum ieee80211_smps_mode smps, const u8 *da,
	325	const u8 *bssid)
	326	{
	327	struct ieee80211_local *local = sdata->local;
	328	struct sk_buff *skb;
	329	struct ieee80211_mgmt *action_frame;
	330
	331	/* 27 = header + category + action + smps mode */
	332	skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom);
	333	if (!skb)
	334	return -ENOMEM;
	335
	336	skb_reserve(skb, local->hw.extra_tx_headroom);
	337	action_frame = (void *)skb_put(skb, 27);
	338	memcpy(action_frame->da, da, ETH_ALEN);
	339	memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN);
	340	memcpy(action_frame->bssid, bssid, ETH_ALEN);
	341	action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT \|
	342	IEEE80211_STYPE_ACTION);
	343	action_frame->u.action.category = WLAN_CATEGORY_HT;
	344	action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS;
	345	switch (smps) {
	346	case IEEE80211_SMPS_AUTOMATIC:
	347	case IEEE80211_SMPS_NUM_MODES:
	348	WARN_ON(1);
	349	case IEEE80211_SMPS_OFF:
	350	action_frame->u.action.u.ht_smps.smps_control =
	351	WLAN_HT_SMPS_CONTROL_DISABLED;
	352	break;
	353	case IEEE80211_SMPS_STATIC:
	354	action_frame->u.action.u.ht_smps.smps_control =
	355	WLAN_HT_SMPS_CONTROL_STATIC;
	356	break;
	357	case IEEE80211_SMPS_DYNAMIC:
	358	action_frame->u.action.u.ht_smps.smps_control =
	359	WLAN_HT_SMPS_CONTROL_DYNAMIC;
	360	break;
	361	}
	362
	363	/* we'll do more on status of this frame */
	364	IEEE80211_SKB_CB(skb)->flags \|= IEEE80211_TX_CTL_REQ_TX_STATUS;
	365	ieee80211_tx_skb(sdata, skb);
	366
	367	return 0;
	368	}
d1f5b7a3 JB	369
	370	void ieee80211_request_smps_work(struct work_struct *work)
	371	{
	372	struct ieee80211_sub_if_data *sdata =
	373	container_of(work, struct ieee80211_sub_if_data,
	374	u.mgd.request_smps_work);
	375
	376	mutex_lock(&sdata->u.mgd.mtx);
	377	__ieee80211_request_smps(sdata, sdata->u.mgd.driver_smps_mode);
	378	mutex_unlock(&sdata->u.mgd.mtx);
	379	}
	380
	381	void ieee80211_request_smps(struct ieee80211_vif *vif,
	382	enum ieee80211_smps_mode smps_mode)
	383	{
	384	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
	385
	386	if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
	387	return;
	388
	389	if (WARN_ON(smps_mode == IEEE80211_SMPS_OFF))
	390	smps_mode = IEEE80211_SMPS_AUTOMATIC;
	391
e4b55957 JB	392	sdata->u.mgd.driver_smps_mode = smps_mode;
e4b55957 JB	393
d1f5b7a3 JB	394	ieee80211_queue_work(&sdata->local->hw,
	395	&sdata->u.mgd.request_smps_work);
	396	}
	397	/* this might change ... don't want non-open drivers using it */
	398	EXPORT_SYMBOL_GPL(ieee80211_request_smps);