[GitHub/mt8127/android_kernel_alcatel_ttab.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 (!ht_cap->ht_supported)
		return;

	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 SGI-20 (SGI-40 is handled above) */
	__check_htcap_disable(sdata, ht_cap, IEEE80211_HT_CAP_SGI_20);

	/* 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;
	}
}


bool ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_sub_if_data *sdata,
				       struct ieee80211_supported_band *sband,
				       const struct ieee80211_ht_cap *ht_cap_ie,
				       struct sta_info *sta)
{
	struct ieee80211_sta_ht_cap ht_cap;
	u8 ampdu_info, tx_mcs_set_cap;
	int i, max_tx_streams;
	bool changed;
	enum ieee80211_sta_rx_bandwidth bw;
	enum ieee80211_smps_mode smps_mode;

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

	if (!ht_cap_ie || !sband->ht_cap.ht_supported)
		goto apply;

	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))
		goto apply;

	/* 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;

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

	changed = memcmp(&sta->sta.ht_cap, &ht_cap, sizeof(ht_cap));

	memcpy(&sta->sta.ht_cap, &ht_cap, sizeof(ht_cap));

	switch (sdata->vif.bss_conf.chandef.width) {
	default:
		WARN_ON_ONCE(1);
		/* fall through */
	case NL80211_CHAN_WIDTH_20_NOHT:
	case NL80211_CHAN_WIDTH_20:
		bw = IEEE80211_STA_RX_BW_20;
		break;
	case NL80211_CHAN_WIDTH_40:
	case NL80211_CHAN_WIDTH_80:
	case NL80211_CHAN_WIDTH_80P80:
	case NL80211_CHAN_WIDTH_160:
		bw = ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
				IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20;
		break;
	}

	if (bw != sta->sta.bandwidth)
		changed = true;
	sta->sta.bandwidth = bw;

	sta->cur_max_bandwidth =
		ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
				IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20;

	switch ((ht_cap.cap & IEEE80211_HT_CAP_SM_PS)
			>> IEEE80211_HT_CAP_SM_PS_SHIFT) {
	case WLAN_HT_CAP_SM_PS_INVALID:
	case WLAN_HT_CAP_SM_PS_STATIC:
		smps_mode = IEEE80211_SMPS_STATIC;
		break;
	case WLAN_HT_CAP_SM_PS_DYNAMIC:
		smps_mode = IEEE80211_SMPS_DYNAMIC;
		break;
	case WLAN_HT_CAP_SM_PS_DISABLED:
		smps_mode = IEEE80211_SMPS_OFF;
		break;
	}

	if (smps_mode != sta->sta.smps_mode)
		changed = true;
	sta->sta.smps_mode = smps_mode;

	return changed;
}

void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta,
					 enum ieee80211_agg_stop_reason reason)
{
	int i;

	cancel_work_sync(&sta->ampdu_mlme.work);

	for (i = 0; i <  IEEE80211_NUM_TIDS; i++) {
		__ieee80211_stop_tx_ba_session(sta, i, reason);
		__ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT,
					       WLAN_REASON_QSTA_LEAVE_QBSS,
					       reason != AGG_STOP_DESTROY_STA &&
					       reason != AGG_STOP_PEER_REQUEST);
	}
}

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 < IEEE80211_NUM_TIDS; 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,
							AGG_STOP_LOCAL_REQUEST);
	}
	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;

	ht_dbg_ratelimited(sdata, "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));

	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, AGG_STOP_PEER_REQUEST);
}

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;

	if (sdata->u.mgd.driver_smps_mode == smps_mode)
		return;

	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
e1a0c6b3 JB	40	if (!ht_cap->ht_supported)
	41	return;
	42
ef96a842	43	if (sdata->vif.type != NL80211_IFTYPE_STATION) {
4e79fada BG	44	/* AP interfaces call this code when adding new stations,
	45	* so just silently ignore non station interfaces.
	46	*/
ef96a842 BG	47	return;
	48	}
	49
	50	/* NOTE: If you add more over-rides here, update register_hw
	51	* ht_capa_mod_msk logic in main.c as well.
	52	* And, if this method can ever change ht_cap.ht_supported, fix
	53	* the check in ieee80211_add_ht_ie.
	54	*/
	55
	56	/* check for HT over-rides, MCS rates first. */
	57	for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++) {
	58	u8 m = smask[i];
	59	ht_cap->mcs.rx_mask[i] &= ~m; /* turn off all masked bits */
	60	/* Add back rates that are supported */
	61	ht_cap->mcs.rx_mask[i] \|= (m & scaps[i]);
	62	}
	63
	64	/* Force removal of HT-40 capabilities? */
	65	__check_htcap_disable(sdata, ht_cap, IEEE80211_HT_CAP_SUP_WIDTH_20_40);
	66	__check_htcap_disable(sdata, ht_cap, IEEE80211_HT_CAP_SGI_40);
	67
bc0784d9 BG	68	/* Allow user to disable SGI-20 (SGI-40 is handled above) */
	69	__check_htcap_disable(sdata, ht_cap, IEEE80211_HT_CAP_SGI_20);
	70
ef96a842 BG	71	/* Allow user to disable the max-AMSDU bit. */
	72	__check_htcap_disable(sdata, ht_cap, IEEE80211_HT_CAP_MAX_AMSDU);
	73
	74	/* Allow user to decrease AMPDU factor */
	75	if (sdata->u.mgd.ht_capa_mask.ampdu_params_info &
	76	IEEE80211_HT_AMPDU_PARM_FACTOR) {
	77	u8 n = sdata->u.mgd.ht_capa.ampdu_params_info
	78	& IEEE80211_HT_AMPDU_PARM_FACTOR;
	79	if (n < ht_cap->ampdu_factor)
	80	ht_cap->ampdu_factor = n;
	81	}
	82
	83	/* Allow the user to increase AMPDU density. */
	84	if (sdata->u.mgd.ht_capa_mask.ampdu_params_info &
	85	IEEE80211_HT_AMPDU_PARM_DENSITY) {
	86	u8 n = (sdata->u.mgd.ht_capa.ampdu_params_info &
	87	IEEE80211_HT_AMPDU_PARM_DENSITY)
	88	>> IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT;
	89	if (n > ht_cap->ampdu_density)
	90	ht_cap->ampdu_density = n;
	91	}
	92	}
	93
	94
e1a0c6b3	95	bool ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_sub_if_data *sdata,
ef96a842	96	struct ieee80211_supported_band *sband,
4a3cb702	97	const struct ieee80211_ht_cap *ht_cap_ie,
e1a0c6b3	98	struct sta_info *sta)
44d414db	99	{
e1a0c6b3	100	struct ieee80211_sta_ht_cap ht_cap;
ae5eb026 JB	101	u8 ampdu_info, tx_mcs_set_cap;
ae5eb026 JB	102	int i, max_tx_streams;
e1a0c6b3 JB	103	bool changed;
e1a0c6b3 JB	104	enum ieee80211_sta_rx_bandwidth bw;
af0ed69b	105	enum ieee80211_smps_mode smps_mode;
44d414db	106
e1a0c6b3	107	memset(&ht_cap, 0, sizeof(ht_cap));
44d414db	108
15804e3e	109	if (!ht_cap_ie \|\| !sband->ht_cap.ht_supported)
e1a0c6b3	110	goto apply;
d9fe60de	111
e1a0c6b3	112	ht_cap.ht_supported = true;
d9fe60de	113
9a418af5 JB	114	/*
	115	* The bits listed in this expression should be
	116	* the same for the peer and us, if the station
	117	* advertises more then we can't use those thus
	118	* we mask them out.
	119	*/
e1a0c6b3	120	ht_cap.cap = le16_to_cpu(ht_cap_ie->cap_info) &
9a418af5 JB	121	(sband->ht_cap.cap \|
	122	~(IEEE80211_HT_CAP_LDPC_CODING \|
	123	IEEE80211_HT_CAP_SUP_WIDTH_20_40 \|
	124	IEEE80211_HT_CAP_GRN_FLD \|
	125	IEEE80211_HT_CAP_SGI_20 \|
	126	IEEE80211_HT_CAP_SGI_40 \|
	127	IEEE80211_HT_CAP_DSSSCCK40));
21add825	128
9a418af5 JB	129	/*
	130	* The STBC bits are asymmetric -- if we don't have
	131	* TX then mask out the peer's RX and vice versa.
	132	*/
	133	if (!(sband->ht_cap.cap & IEEE80211_HT_CAP_TX_STBC))
e1a0c6b3	134	ht_cap.cap &= ~IEEE80211_HT_CAP_RX_STBC;
9a418af5	135	if (!(sband->ht_cap.cap & IEEE80211_HT_CAP_RX_STBC))
e1a0c6b3	136	ht_cap.cap &= ~IEEE80211_HT_CAP_TX_STBC;
d9fe60de	137
ae5eb026	138	ampdu_info = ht_cap_ie->ampdu_params_info;
e1a0c6b3	139	ht_cap.ampdu_factor =
ae5eb026	140	ampdu_info & IEEE80211_HT_AMPDU_PARM_FACTOR;
e1a0c6b3	141	ht_cap.ampdu_density =
ae5eb026	142	(ampdu_info & IEEE80211_HT_AMPDU_PARM_DENSITY) >> 2;
44d414db	143
d9fe60de JB	144	/* own MCS TX capabilities */
	145	tx_mcs_set_cap = sband->ht_cap.mcs.tx_params;
	146
90b4ca9d	147	/* Copy peer MCS TX capabilities, the driver might need them. */
e1a0c6b3	148	ht_cap.mcs.tx_params = ht_cap_ie->mcs.tx_params;
90b4ca9d	149
d9fe60de JB	150	/* can we TX with MCS rates? */
d9fe60de JB	151	if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED))
e1a0c6b3	152	goto apply;
d9fe60de JB	153
	154	/* Counting from 0, therefore +1 */
	155	if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF)
	156	max_tx_streams =
	157	((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
	158	>> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
	159	else
	160	max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS;
	161
	162	/*
90b4ca9d	163	* 802.11n-2009 20.3.5 / 20.6 says:
d9fe60de JB	164	* - indices 0 to 7 and 32 are single spatial stream
	165	* - 8 to 31 are multiple spatial streams using equal modulation
	166	* [8..15 for two streams, 16..23 for three and 24..31 for four]
	167	* - remainder are multiple spatial streams using unequal modulation
	168	*/
	169	for (i = 0; i < max_tx_streams; i++)
e1a0c6b3	170	ht_cap.mcs.rx_mask[i] =
ae5eb026	171	sband->ht_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i];
d9fe60de JB	172
	173	if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION)
	174	for (i = IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE;
	175	i < IEEE80211_HT_MCS_MASK_LEN; i++)
e1a0c6b3	176	ht_cap.mcs.rx_mask[i] =
d9fe60de	177	sband->ht_cap.mcs.rx_mask[i] &
ae5eb026	178	ht_cap_ie->mcs.rx_mask[i];
d9fe60de JB	179
d9fe60de JB	180	/* handle MCS rate 32 too */
ae5eb026	181	if (sband->ht_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1)
e1a0c6b3	182	ht_cap.mcs.rx_mask[32/8] \|= 1;
ef96a842	183
e1a0c6b3	184	apply:
ef96a842 BG	185	/*
	186	* If user has specified capability over-rides, take care
	187	* of that here.
	188	*/
e1a0c6b3 JB	189	ieee80211_apply_htcap_overrides(sdata, &ht_cap);
	190
	191	changed = memcmp(&sta->sta.ht_cap, &ht_cap, sizeof(ht_cap));
	192
	193	memcpy(&sta->sta.ht_cap, &ht_cap, sizeof(ht_cap));
	194
	195	switch (sdata->vif.bss_conf.chandef.width) {
	196	default:
	197	WARN_ON_ONCE(1);
	198	/* fall through */
	199	case NL80211_CHAN_WIDTH_20_NOHT:
	200	case NL80211_CHAN_WIDTH_20:
	201	bw = IEEE80211_STA_RX_BW_20;
	202	break;
	203	case NL80211_CHAN_WIDTH_40:
	204	case NL80211_CHAN_WIDTH_80:
	205	case NL80211_CHAN_WIDTH_80P80:
	206	case NL80211_CHAN_WIDTH_160:
	207	bw = ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
	208	IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20;
	209	break;
	210	}
	211
	212	if (bw != sta->sta.bandwidth)
	213	changed = true;
	214	sta->sta.bandwidth = bw;
	215
0af83d3d JB	216	sta->cur_max_bandwidth =
	217	ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
	218	IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20;
	219
af0ed69b JB	220	switch ((ht_cap.cap & IEEE80211_HT_CAP_SM_PS)
	221	>> IEEE80211_HT_CAP_SM_PS_SHIFT) {
	222	case WLAN_HT_CAP_SM_PS_INVALID:
	223	case WLAN_HT_CAP_SM_PS_STATIC:
	224	smps_mode = IEEE80211_SMPS_STATIC;
	225	break;
	226	case WLAN_HT_CAP_SM_PS_DYNAMIC:
	227	smps_mode = IEEE80211_SMPS_DYNAMIC;
	228	break;
	229	case WLAN_HT_CAP_SM_PS_DISABLED:
	230	smps_mode = IEEE80211_SMPS_OFF;
	231	break;
	232	}
	233
	234	if (smps_mode != sta->sta.smps_mode)
	235	changed = true;
	236	sta->sta.smps_mode = smps_mode;
	237
e1a0c6b3	238	return changed;
ae5eb026 JB	239	}
ae5eb026 JB	240
c82c4a80 JB	241	void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta,
c82c4a80 JB	242	enum ieee80211_agg_stop_reason reason)
de1ede7a	243	{
b8695a8f	244	int i;
de1ede7a	245
0ab33703 JB	246	cancel_work_sync(&sta->ampdu_mlme.work);
0ab33703 JB	247
5a306f58	248	for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
c82c4a80	249	__ieee80211_stop_tx_ba_session(sta, i, reason);
849b7967	250	__ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT,
c82c4a80 JB	251	WLAN_REASON_QSTA_LEAVE_QBSS,
	252	reason != AGG_STOP_DESTROY_STA &&
	253	reason != AGG_STOP_PEER_REQUEST);
de1ede7a	254	}
de1ede7a JB	255	}
de1ede7a JB	256
67c282c0 JB	257	void ieee80211_ba_session_work(struct work_struct *work)
	258	{
	259	struct sta_info *sta =
	260	container_of(work, struct sta_info, ampdu_mlme.work);
	261	struct tid_ampdu_tx *tid_tx;
	262	int tid;
	263
	264	/*
	265	* When this flag is set, new sessions should be
	266	* blocked, and existing sessions will be torn
	267	* down by the code that set the flag, so this
	268	* need not run.
	269	*/
c2c98fde	270	if (test_sta_flag(sta, WLAN_STA_BLOCK_BA))
67c282c0 JB	271	return;
67c282c0 JB	272
a93e3644	273	mutex_lock(&sta->ampdu_mlme.mtx);
5a306f58	274	for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) {
7c3b1dd8 JB	275	if (test_and_clear_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired))
	276	___ieee80211_stop_rx_ba_session(
	277	sta, tid, WLAN_BACK_RECIPIENT,
53f73c09	278	WLAN_REASON_QSTA_TIMEOUT, true);
7c3b1dd8	279
f41ccd71 SL	280	if (test_and_clear_bit(tid,
	281	sta->ampdu_mlme.tid_rx_stop_requested))
	282	___ieee80211_stop_rx_ba_session(
	283	sta, tid, WLAN_BACK_RECIPIENT,
	284	WLAN_REASON_UNSPECIFIED, true);
	285
ec034b20 JB	286	tid_tx = sta->ampdu_mlme.tid_start_tx[tid];
	287	if (tid_tx) {
	288	/*
	289	* Assign it over to the normal tid_tx array
	290	* where it "goes live".
	291	*/
	292	spin_lock_bh(&sta->lock);
	293
	294	sta->ampdu_mlme.tid_start_tx[tid] = NULL;
	295	/* could there be a race? */
	296	if (sta->ampdu_mlme.tid_tx[tid])
	297	kfree(tid_tx);
	298	else
	299	ieee80211_assign_tid_tx(sta, tid, tid_tx);
	300	spin_unlock_bh(&sta->lock);
67c282c0	301
67c282c0	302	ieee80211_tx_ba_session_handle_start(sta, tid);
ec034b20 JB	303	continue;
	304	}
	305
40b275b6	306	tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
ec034b20 JB	307	if (tid_tx && test_and_clear_bit(HT_AGG_STATE_WANT_STOP,
ec034b20 JB	308	&tid_tx->state))
67c282c0	309	___ieee80211_stop_tx_ba_session(sta, tid,
c82c4a80	310	AGG_STOP_LOCAL_REQUEST);
67c282c0	311	}
cfcdbde3	312	mutex_unlock(&sta->ampdu_mlme.mtx);
67c282c0 JB	313	}
67c282c0 JB	314
b8695a8f JB	315	void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
	316	const u8 *da, u16 tid,
	317	u16 initiator, u16 reason_code)
44d414db JB	318	{
44d414db JB	319	struct ieee80211_local *local = sdata->local;
44d414db JB	320	struct sk_buff *skb;
	321	struct ieee80211_mgmt *mgmt;
	322	u16 params;
	323
	324	skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
d15b8459	325	if (!skb)
44d414db	326	return;
44d414db JB	327
	328	skb_reserve(skb, local->hw.extra_tx_headroom);
	329	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
	330	memset(mgmt, 0, 24);
	331	memcpy(mgmt->da, da, ETH_ALEN);
47846c9b	332	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
8abd3f9b	333	if (sdata->vif.type == NL80211_IFTYPE_AP \|\|
ae2772b3 TP	334	sdata->vif.type == NL80211_IFTYPE_AP_VLAN \|\|
ae2772b3 TP	335	sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
47846c9b	336	memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
46900298 JB	337	else if (sdata->vif.type == NL80211_IFTYPE_STATION)
46900298 JB	338	memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
13c40c54 AS	339	else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
13c40c54 AS	340	memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN);
46900298	341
44d414db JB	342	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT \|
	343	IEEE80211_STYPE_ACTION);
	344
	345	skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
	346
	347	mgmt->u.action.category = WLAN_CATEGORY_BACK;
	348	mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
	349	params = (u16)(initiator << 11); /* bit 11 initiator */
	350	params \|= (u16)(tid << 12); /* bit 15:12 TID number */
	351
	352	mgmt->u.action.u.delba.params = cpu_to_le16(params);
	353	mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
	354
cf6bb79a	355	ieee80211_tx_skb_tid(sdata, skb, tid);
44d414db JB	356	}
44d414db JB	357
de1ede7a JB	358	void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
	359	struct sta_info *sta,
	360	struct ieee80211_mgmt *mgmt, size_t len)
	361	{
de1ede7a JB	362	u16 tid, params;
de1ede7a JB	363	u16 initiator;
de1ede7a JB	364
	365	params = le16_to_cpu(mgmt->u.action.u.delba.params);
	366	tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
	367	initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
	368
bdcbd8e0 JB	369	ht_dbg_ratelimited(sdata, "delba from %pM (%s) tid %d reason code %d\n",
	370	mgmt->sa, initiator ? "initiator" : "recipient",
	371	tid,
	372	le16_to_cpu(mgmt->u.action.u.delba.reason_code));
de1ede7a JB	373
de1ede7a JB	374	if (initiator == WLAN_BACK_INITIATOR)
53f73c09 JB	375	__ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0,
53f73c09 JB	376	true);
a622ab72	377	else
c82c4a80	378	__ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_PEER_REQUEST);
de1ede7a	379	}
0f78231b JB	380
	381	int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata,
	382	enum ieee80211_smps_mode smps, const u8 *da,
	383	const u8 *bssid)
	384	{
	385	struct ieee80211_local *local = sdata->local;
	386	struct sk_buff *skb;
	387	struct ieee80211_mgmt *action_frame;
	388
	389	/* 27 = header + category + action + smps mode */
	390	skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom);
	391	if (!skb)
	392	return -ENOMEM;
	393
	394	skb_reserve(skb, local->hw.extra_tx_headroom);
	395	action_frame = (void *)skb_put(skb, 27);
	396	memcpy(action_frame->da, da, ETH_ALEN);
	397	memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN);
	398	memcpy(action_frame->bssid, bssid, ETH_ALEN);
	399	action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT \|
	400	IEEE80211_STYPE_ACTION);
	401	action_frame->u.action.category = WLAN_CATEGORY_HT;
	402	action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS;
	403	switch (smps) {
	404	case IEEE80211_SMPS_AUTOMATIC:
	405	case IEEE80211_SMPS_NUM_MODES:
	406	WARN_ON(1);
	407	case IEEE80211_SMPS_OFF:
	408	action_frame->u.action.u.ht_smps.smps_control =
	409	WLAN_HT_SMPS_CONTROL_DISABLED;
	410	break;
	411	case IEEE80211_SMPS_STATIC:
	412	action_frame->u.action.u.ht_smps.smps_control =
	413	WLAN_HT_SMPS_CONTROL_STATIC;
	414	break;
	415	case IEEE80211_SMPS_DYNAMIC:
	416	action_frame->u.action.u.ht_smps.smps_control =
	417	WLAN_HT_SMPS_CONTROL_DYNAMIC;
	418	break;
	419	}
	420
	421	/* we'll do more on status of this frame */
	422	IEEE80211_SKB_CB(skb)->flags \|= IEEE80211_TX_CTL_REQ_TX_STATUS;
	423	ieee80211_tx_skb(sdata, skb);
	424
	425	return 0;
	426	}
d1f5b7a3 JB	427
	428	void ieee80211_request_smps_work(struct work_struct *work)
	429	{
	430	struct ieee80211_sub_if_data *sdata =
	431	container_of(work, struct ieee80211_sub_if_data,
	432	u.mgd.request_smps_work);
	433
	434	mutex_lock(&sdata->u.mgd.mtx);
	435	__ieee80211_request_smps(sdata, sdata->u.mgd.driver_smps_mode);
	436	mutex_unlock(&sdata->u.mgd.mtx);
	437	}
	438
	439	void ieee80211_request_smps(struct ieee80211_vif *vif,
	440	enum ieee80211_smps_mode smps_mode)
	441	{
	442	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
	443
	444	if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
	445	return;
	446
	447	if (WARN_ON(smps_mode == IEEE80211_SMPS_OFF))
	448	smps_mode = IEEE80211_SMPS_AUTOMATIC;
	449
66d57570 EG	450	if (sdata->u.mgd.driver_smps_mode == smps_mode)
	451	return;
	452
e4b55957 JB	453	sdata->u.mgd.driver_smps_mode = smps_mode;
e4b55957 JB	454
d1f5b7a3 JB	455	ieee80211_queue_work(&sdata->local->hw,
	456	&sdata->u.mgd.request_smps_work);
	457	}
	458	/* this might change ... don't want non-open drivers using it */
	459	EXPORT_SYMBOL_GPL(ieee80211_request_smps);