[linux.git] / net / mac80211 / ht.c

/*
 * HT handling
 *
 * Copyright 2003, Jouni Malinen <[email protected]>
 * Copyright 2002-2005, Instant802 Networks, Inc.
 * Copyright 2005-2006, Devicescape Software, Inc.
 * Copyright 2006-2007	Jiri Benc <[email protected]>
 * Copyright 2007, Michael Wu <[email protected]>
 * 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 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;
	}
}


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 <  IEEE80211_NUM_TIDS; 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 < 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,
							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;

	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, 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 <[email protected]>
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 <[email protected]>
44d414db JB	8	* Copyright 2007, Michael Wu <[email protected]>
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
bc0784d9 BG	65	/* Allow user to disable SGI-20 (SGI-40 is handled above) */
	66	__check_htcap_disable(sdata, ht_cap, IEEE80211_HT_CAP_SGI_20);
	67
ef96a842 BG	68	/* Allow user to disable the max-AMSDU bit. */
	69	__check_htcap_disable(sdata, ht_cap, IEEE80211_HT_CAP_MAX_AMSDU);
	70
	71	/* Allow user to decrease AMPDU factor */
	72	if (sdata->u.mgd.ht_capa_mask.ampdu_params_info &
	73	IEEE80211_HT_AMPDU_PARM_FACTOR) {
	74	u8 n = sdata->u.mgd.ht_capa.ampdu_params_info
	75	& IEEE80211_HT_AMPDU_PARM_FACTOR;
	76	if (n < ht_cap->ampdu_factor)
	77	ht_cap->ampdu_factor = n;
	78	}
	79
	80	/* Allow the user to increase AMPDU density. */
	81	if (sdata->u.mgd.ht_capa_mask.ampdu_params_info &
	82	IEEE80211_HT_AMPDU_PARM_DENSITY) {
	83	u8 n = (sdata->u.mgd.ht_capa.ampdu_params_info &
	84	IEEE80211_HT_AMPDU_PARM_DENSITY)
	85	>> IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT;
	86	if (n > ht_cap->ampdu_density)
	87	ht_cap->ampdu_density = n;
	88	}
	89	}
	90
	91
	92	void ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_sub_if_data *sdata,
	93	struct ieee80211_supported_band *sband,
ae5eb026	94	struct ieee80211_ht_cap *ht_cap_ie,
d9fe60de	95	struct ieee80211_sta_ht_cap *ht_cap)
44d414db	96	{
ae5eb026 JB	97	u8 ampdu_info, tx_mcs_set_cap;
ae5eb026 JB	98	int i, max_tx_streams;
44d414db	99
d9fe60de	100	BUG_ON(!ht_cap);
44d414db	101
d9fe60de	102	memset(ht_cap, 0, sizeof(*ht_cap));
44d414db	103
15804e3e	104	if (!ht_cap_ie \|\| !sband->ht_cap.ht_supported)
ae5eb026	105	return;
d9fe60de	106
ae5eb026	107	ht_cap->ht_supported = true;
d9fe60de	108
9a418af5 JB	109	/*
	110	* The bits listed in this expression should be
	111	* the same for the peer and us, if the station
	112	* advertises more then we can't use those thus
	113	* we mask them out.
	114	*/
	115	ht_cap->cap = le16_to_cpu(ht_cap_ie->cap_info) &
	116	(sband->ht_cap.cap \|
	117	~(IEEE80211_HT_CAP_LDPC_CODING \|
	118	IEEE80211_HT_CAP_SUP_WIDTH_20_40 \|
	119	IEEE80211_HT_CAP_GRN_FLD \|
	120	IEEE80211_HT_CAP_SGI_20 \|
	121	IEEE80211_HT_CAP_SGI_40 \|
	122	IEEE80211_HT_CAP_DSSSCCK40));
	123	/*
	124	* The STBC bits are asymmetric -- if we don't have
	125	* TX then mask out the peer's RX and vice versa.
	126	*/
	127	if (!(sband->ht_cap.cap & IEEE80211_HT_CAP_TX_STBC))
	128	ht_cap->cap &= ~IEEE80211_HT_CAP_RX_STBC;
	129	if (!(sband->ht_cap.cap & IEEE80211_HT_CAP_RX_STBC))
	130	ht_cap->cap &= ~IEEE80211_HT_CAP_TX_STBC;
d9fe60de	131
ae5eb026 JB	132	ampdu_info = ht_cap_ie->ampdu_params_info;
	133	ht_cap->ampdu_factor =
	134	ampdu_info & IEEE80211_HT_AMPDU_PARM_FACTOR;
	135	ht_cap->ampdu_density =
	136	(ampdu_info & IEEE80211_HT_AMPDU_PARM_DENSITY) >> 2;
44d414db	137
d9fe60de JB	138	/* own MCS TX capabilities */
	139	tx_mcs_set_cap = sband->ht_cap.mcs.tx_params;
	140
90b4ca9d JB	141	/* Copy peer MCS TX capabilities, the driver might need them. */
	142	ht_cap->mcs.tx_params = ht_cap_ie->mcs.tx_params;
	143
d9fe60de JB	144	/* can we TX with MCS rates? */
d9fe60de JB	145	if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED))
ae5eb026	146	return;
d9fe60de JB	147
	148	/* Counting from 0, therefore +1 */
	149	if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF)
	150	max_tx_streams =
	151	((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
	152	>> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
	153	else
	154	max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS;
	155
	156	/*
90b4ca9d	157	* 802.11n-2009 20.3.5 / 20.6 says:
d9fe60de JB	158	* - indices 0 to 7 and 32 are single spatial stream
	159	* - 8 to 31 are multiple spatial streams using equal modulation
	160	* [8..15 for two streams, 16..23 for three and 24..31 for four]
	161	* - remainder are multiple spatial streams using unequal modulation
	162	*/
	163	for (i = 0; i < max_tx_streams; i++)
ae5eb026 JB	164	ht_cap->mcs.rx_mask[i] =
ae5eb026 JB	165	sband->ht_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i];
d9fe60de JB	166
	167	if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION)
	168	for (i = IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE;
	169	i < IEEE80211_HT_MCS_MASK_LEN; i++)
ae5eb026	170	ht_cap->mcs.rx_mask[i] =
d9fe60de	171	sband->ht_cap.mcs.rx_mask[i] &
ae5eb026	172	ht_cap_ie->mcs.rx_mask[i];
d9fe60de JB	173
d9fe60de JB	174	/* handle MCS rate 32 too */
ae5eb026 JB	175	if (sband->ht_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1)
ae5eb026 JB	176	ht_cap->mcs.rx_mask[32/8] \|= 1;
ef96a842 BG	177
	178	/*
	179	* If user has specified capability over-rides, take care
	180	* of that here.
	181	*/
	182	ieee80211_apply_htcap_overrides(sdata, ht_cap);
ae5eb026 JB	183	}
ae5eb026 JB	184
53f73c09	185	void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta, bool tx)
de1ede7a	186	{
b8695a8f	187	int i;
de1ede7a	188
0ab33703 JB	189	cancel_work_sync(&sta->ampdu_mlme.work);
0ab33703 JB	190
5a306f58	191	for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
53f73c09	192	__ieee80211_stop_tx_ba_session(sta, i, WLAN_BACK_INITIATOR, tx);
849b7967	193	__ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT,
53f73c09	194	WLAN_REASON_QSTA_LEAVE_QBSS, tx);
de1ede7a	195	}
de1ede7a JB	196	}
de1ede7a JB	197
67c282c0 JB	198	void ieee80211_ba_session_work(struct work_struct *work)
	199	{
	200	struct sta_info *sta =
	201	container_of(work, struct sta_info, ampdu_mlme.work);
	202	struct tid_ampdu_tx *tid_tx;
	203	int tid;
	204
	205	/*
	206	* When this flag is set, new sessions should be
	207	* blocked, and existing sessions will be torn
	208	* down by the code that set the flag, so this
	209	* need not run.
	210	*/
c2c98fde	211	if (test_sta_flag(sta, WLAN_STA_BLOCK_BA))
67c282c0 JB	212	return;
67c282c0 JB	213
a93e3644	214	mutex_lock(&sta->ampdu_mlme.mtx);
5a306f58	215	for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) {
7c3b1dd8 JB	216	if (test_and_clear_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired))
	217	___ieee80211_stop_rx_ba_session(
	218	sta, tid, WLAN_BACK_RECIPIENT,
53f73c09	219	WLAN_REASON_QSTA_TIMEOUT, true);
7c3b1dd8	220
f41ccd71 SL	221	if (test_and_clear_bit(tid,
	222	sta->ampdu_mlme.tid_rx_stop_requested))
	223	___ieee80211_stop_rx_ba_session(
	224	sta, tid, WLAN_BACK_RECIPIENT,
	225	WLAN_REASON_UNSPECIFIED, true);
	226
ec034b20 JB	227	tid_tx = sta->ampdu_mlme.tid_start_tx[tid];
	228	if (tid_tx) {
	229	/*
	230	* Assign it over to the normal tid_tx array
	231	* where it "goes live".
	232	*/
	233	spin_lock_bh(&sta->lock);
	234
	235	sta->ampdu_mlme.tid_start_tx[tid] = NULL;
	236	/* could there be a race? */
	237	if (sta->ampdu_mlme.tid_tx[tid])
	238	kfree(tid_tx);
	239	else
	240	ieee80211_assign_tid_tx(sta, tid, tid_tx);
	241	spin_unlock_bh(&sta->lock);
67c282c0	242
67c282c0	243	ieee80211_tx_ba_session_handle_start(sta, tid);
ec034b20 JB	244	continue;
	245	}
	246
40b275b6	247	tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
ec034b20 JB	248	if (tid_tx && test_and_clear_bit(HT_AGG_STATE_WANT_STOP,
ec034b20 JB	249	&tid_tx->state))
67c282c0	250	___ieee80211_stop_tx_ba_session(sta, tid,
53f73c09 JB	251	WLAN_BACK_INITIATOR,
53f73c09 JB	252	true);
67c282c0	253	}
cfcdbde3	254	mutex_unlock(&sta->ampdu_mlme.mtx);
67c282c0 JB	255	}
67c282c0 JB	256
b8695a8f JB	257	void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
	258	const u8 *da, u16 tid,
	259	u16 initiator, u16 reason_code)
44d414db JB	260	{
44d414db JB	261	struct ieee80211_local *local = sdata->local;
44d414db JB	262	struct sk_buff *skb;
	263	struct ieee80211_mgmt *mgmt;
	264	u16 params;
	265
	266	skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
d15b8459	267	if (!skb)
44d414db	268	return;
44d414db JB	269
	270	skb_reserve(skb, local->hw.extra_tx_headroom);
	271	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
	272	memset(mgmt, 0, 24);
	273	memcpy(mgmt->da, da, ETH_ALEN);
47846c9b	274	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
8abd3f9b	275	if (sdata->vif.type == NL80211_IFTYPE_AP \|\|
ae2772b3 TP	276	sdata->vif.type == NL80211_IFTYPE_AP_VLAN \|\|
ae2772b3 TP	277	sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
47846c9b	278	memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
46900298 JB	279	else if (sdata->vif.type == NL80211_IFTYPE_STATION)
46900298 JB	280	memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
13c40c54 AS	281	else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
13c40c54 AS	282	memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN);
46900298	283
44d414db JB	284	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT \|
	285	IEEE80211_STYPE_ACTION);
	286
	287	skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
	288
	289	mgmt->u.action.category = WLAN_CATEGORY_BACK;
	290	mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
	291	params = (u16)(initiator << 11); /* bit 11 initiator */
	292	params \|= (u16)(tid << 12); /* bit 15:12 TID number */
	293
	294	mgmt->u.action.u.delba.params = cpu_to_le16(params);
	295	mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
	296
cf6bb79a	297	ieee80211_tx_skb_tid(sdata, skb, tid);
44d414db JB	298	}
44d414db JB	299
de1ede7a JB	300	void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
	301	struct sta_info *sta,
	302	struct ieee80211_mgmt *mgmt, size_t len)
	303	{
de1ede7a JB	304	u16 tid, params;
de1ede7a JB	305	u16 initiator;
de1ede7a JB	306
	307	params = le16_to_cpu(mgmt->u.action.u.delba.params);
	308	tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
	309	initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
	310
bdcbd8e0 JB	311	ht_dbg_ratelimited(sdata, "delba from %pM (%s) tid %d reason code %d\n",
	312	mgmt->sa, initiator ? "initiator" : "recipient",
	313	tid,
	314	le16_to_cpu(mgmt->u.action.u.delba.reason_code));
de1ede7a JB	315
de1ede7a JB	316	if (initiator == WLAN_BACK_INITIATOR)
53f73c09 JB	317	__ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0,
53f73c09 JB	318	true);
a622ab72	319	else
53f73c09 JB	320	__ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_RECIPIENT,
53f73c09 JB	321	true);
de1ede7a	322	}
0f78231b JB	323
	324	int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata,
	325	enum ieee80211_smps_mode smps, const u8 *da,
	326	const u8 *bssid)
	327	{
	328	struct ieee80211_local *local = sdata->local;
	329	struct sk_buff *skb;
	330	struct ieee80211_mgmt *action_frame;
	331
	332	/* 27 = header + category + action + smps mode */
	333	skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom);
	334	if (!skb)
	335	return -ENOMEM;
	336
	337	skb_reserve(skb, local->hw.extra_tx_headroom);
	338	action_frame = (void *)skb_put(skb, 27);
	339	memcpy(action_frame->da, da, ETH_ALEN);
	340	memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN);
	341	memcpy(action_frame->bssid, bssid, ETH_ALEN);
	342	action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT \|
	343	IEEE80211_STYPE_ACTION);
	344	action_frame->u.action.category = WLAN_CATEGORY_HT;
	345	action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS;
	346	switch (smps) {
	347	case IEEE80211_SMPS_AUTOMATIC:
	348	case IEEE80211_SMPS_NUM_MODES:
	349	WARN_ON(1);
	350	case IEEE80211_SMPS_OFF:
	351	action_frame->u.action.u.ht_smps.smps_control =
	352	WLAN_HT_SMPS_CONTROL_DISABLED;
	353	break;
	354	case IEEE80211_SMPS_STATIC:
	355	action_frame->u.action.u.ht_smps.smps_control =
	356	WLAN_HT_SMPS_CONTROL_STATIC;
	357	break;
	358	case IEEE80211_SMPS_DYNAMIC:
	359	action_frame->u.action.u.ht_smps.smps_control =
	360	WLAN_HT_SMPS_CONTROL_DYNAMIC;
	361	break;
	362	}
	363
	364	/* we'll do more on status of this frame */
	365	IEEE80211_SKB_CB(skb)->flags \|= IEEE80211_TX_CTL_REQ_TX_STATUS;
	366	ieee80211_tx_skb(sdata, skb);
	367
	368	return 0;
	369	}
d1f5b7a3 JB	370
	371	void ieee80211_request_smps_work(struct work_struct *work)
	372	{
	373	struct ieee80211_sub_if_data *sdata =
	374	container_of(work, struct ieee80211_sub_if_data,
	375	u.mgd.request_smps_work);
	376
	377	mutex_lock(&sdata->u.mgd.mtx);
	378	__ieee80211_request_smps(sdata, sdata->u.mgd.driver_smps_mode);
	379	mutex_unlock(&sdata->u.mgd.mtx);
	380	}
	381
	382	void ieee80211_request_smps(struct ieee80211_vif *vif,
	383	enum ieee80211_smps_mode smps_mode)
	384	{
	385	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
	386
	387	if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
	388	return;
	389
	390	if (WARN_ON(smps_mode == IEEE80211_SMPS_OFF))
	391	smps_mode = IEEE80211_SMPS_AUTOMATIC;
	392
e4b55957 JB	393	sdata->u.mgd.driver_smps_mode = smps_mode;
e4b55957 JB	394
d1f5b7a3 JB	395	ieee80211_queue_work(&sdata->local->hw,
	396	&sdata->u.mgd.request_smps_work);
	397	}
	398	/* this might change ... don't want non-open drivers using it */
	399	EXPORT_SYMBOL_GPL(ieee80211_request_smps);