net/mac80211/vht.c - linux - Git at Google

 /*
  * VHT handling
  *
  * Portions of this file
  * Copyright(c) 2015 - 2016 Intel Deutschland GmbH
  * Copyright (C) 2018 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_vhtcap_disable(struct ieee80211_sub_if_data *sdata,
 				   struct ieee80211_sta_vht_cap *vht_cap,
 				   u32 flag)
 {
 	__le32 le_flag = cpu_to_le32(flag);

 	if (sdata->u.mgd.vht_capa_mask.vht_cap_info & le_flag &&
 	    !(sdata->u.mgd.vht_capa.vht_cap_info & le_flag))
 		vht_cap->cap &= ~flag;
 }

 void ieee80211_apply_vhtcap_overrides(struct ieee80211_sub_if_data *sdata,
 				      struct ieee80211_sta_vht_cap *vht_cap)
 {
 	int i;
 	u16 rxmcs_mask, rxmcs_cap, rxmcs_n, txmcs_mask, txmcs_cap, txmcs_n;

 	if (!vht_cap->vht_supported)
 		return;

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

 	__check_vhtcap_disable(sdata, vht_cap,
 			       IEEE80211_VHT_CAP_RXLDPC);
 	__check_vhtcap_disable(sdata, vht_cap,
 			       IEEE80211_VHT_CAP_SHORT_GI_80);
 	__check_vhtcap_disable(sdata, vht_cap,
 			       IEEE80211_VHT_CAP_SHORT_GI_160);
 	__check_vhtcap_disable(sdata, vht_cap,
 			       IEEE80211_VHT_CAP_TXSTBC);
 	__check_vhtcap_disable(sdata, vht_cap,
 			       IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE);
 	__check_vhtcap_disable(sdata, vht_cap,
 			       IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE);
 	__check_vhtcap_disable(sdata, vht_cap,
 			       IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN);
 	__check_vhtcap_disable(sdata, vht_cap,
 			       IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN);

 	/* Allow user to decrease AMPDU length exponent */
 	if (sdata->u.mgd.vht_capa_mask.vht_cap_info &
 	    cpu_to_le32(IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK)) {
 		u32 cap, n;

 		n = le32_to_cpu(sdata->u.mgd.vht_capa.vht_cap_info) &
 			IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK;
 		n >>= IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_SHIFT;
 		cap = vht_cap->cap & IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK;
 		cap >>= IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_SHIFT;

 		if (n < cap) {
 			vht_cap->cap &=
 				~IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK;
 			vht_cap->cap |=
 				n << IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_SHIFT;
 		}
 	}

 	/* Allow the user to decrease MCSes */
 	rxmcs_mask =
 		le16_to_cpu(sdata->u.mgd.vht_capa_mask.supp_mcs.rx_mcs_map);
 	rxmcs_n = le16_to_cpu(sdata->u.mgd.vht_capa.supp_mcs.rx_mcs_map);
 	rxmcs_n &= rxmcs_mask;
 	rxmcs_cap = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map);

 	txmcs_mask =
 		le16_to_cpu(sdata->u.mgd.vht_capa_mask.supp_mcs.tx_mcs_map);
 	txmcs_n = le16_to_cpu(sdata->u.mgd.vht_capa.supp_mcs.tx_mcs_map);
 	txmcs_n &= txmcs_mask;
 	txmcs_cap = le16_to_cpu(vht_cap->vht_mcs.tx_mcs_map);
 	for (i = 0; i < 8; i++) {
 		u8 m, n, c;

 		m = (rxmcs_mask >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
 		n = (rxmcs_n >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
 		c = (rxmcs_cap >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;

 		if (m && ((c != IEEE80211_VHT_MCS_NOT_SUPPORTED && n < c) ||
 			  n == IEEE80211_VHT_MCS_NOT_SUPPORTED)) {
 			rxmcs_cap &= ~(3 << 2*i);
 			rxmcs_cap |= (rxmcs_n & (3 << 2*i));
 		}

 		m = (txmcs_mask >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
 		n = (txmcs_n >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
 		c = (txmcs_cap >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;

 		if (m && ((c != IEEE80211_VHT_MCS_NOT_SUPPORTED && n < c) ||
 			  n == IEEE80211_VHT_MCS_NOT_SUPPORTED)) {
 			txmcs_cap &= ~(3 << 2*i);
 			txmcs_cap |= (txmcs_n & (3 << 2*i));
 		}
 	}
 	vht_cap->vht_mcs.rx_mcs_map = cpu_to_le16(rxmcs_cap);
 	vht_cap->vht_mcs.tx_mcs_map = cpu_to_le16(txmcs_cap);
 }

 void
 ieee80211_vht_cap_ie_to_sta_vht_cap(struct ieee80211_sub_if_data *sdata,
 				    struct ieee80211_supported_band *sband,
 				    const struct ieee80211_vht_cap *vht_cap_ie,
 				    struct sta_info *sta)
 {
 	struct ieee80211_sta_vht_cap *vht_cap = &sta->sta.vht_cap;
 	struct ieee80211_sta_vht_cap own_cap;
 	u32 cap_info, i;
 	bool have_80mhz;

 	memset(vht_cap, 0, sizeof(*vht_cap));

 	if (!sta->sta.ht_cap.ht_supported)
 		return;

 	if (!vht_cap_ie || !sband->vht_cap.vht_supported)
 		return;

 	/* Allow VHT if at least one channel on the sband supports 80 MHz */
 	have_80mhz = false;
 	for (i = 0; i < sband->n_channels; i++) {
 		if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
 						IEEE80211_CHAN_NO_80MHZ))
 			continue;

 		have_80mhz = true;
 		break;
 	}

 	if (!have_80mhz)
 		return;

 	/*
 	 * A VHT STA must support 40 MHz, but if we verify that here
 	 * then we break a few things - some APs (e.g. Netgear R6300v2
 	 * and others based on the BCM4360 chipset) will unset this
 	 * capability bit when operating in 20 MHz.
 	 */

 	vht_cap->vht_supported = true;

 	own_cap = sband->vht_cap;
 	/*
 	 * If user has specified capability overrides, take care
 	 * of that if the station we're setting up is the AP that
 	 * we advertised a restricted capability set to. Override
 	 * our own capabilities and then use those below.
 	 */
 	if (sdata->vif.type == NL80211_IFTYPE_STATION &&
 	    !test_sta_flag(sta, WLAN_STA_TDLS_PEER))
 		ieee80211_apply_vhtcap_overrides(sdata, &own_cap);

 	/* take some capabilities as-is */
 	cap_info = le32_to_cpu(vht_cap_ie->vht_cap_info);
 	vht_cap->cap = cap_info;
 	vht_cap->cap &= IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_3895 |
 			IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_7991 |
 			IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_11454 |
 			IEEE80211_VHT_CAP_RXLDPC |
 			IEEE80211_VHT_CAP_VHT_TXOP_PS |
 			IEEE80211_VHT_CAP_HTC_VHT |
 			IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK |
 			IEEE80211_VHT_CAP_VHT_LINK_ADAPTATION_VHT_UNSOL_MFB |
 			IEEE80211_VHT_CAP_VHT_LINK_ADAPTATION_VHT_MRQ_MFB |
 			IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN |
 			IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN;

 	/* and some based on our own capabilities */
 	switch (own_cap.cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) {
 	case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ:
 		vht_cap->cap |= cap_info &
 				IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
 		break;
 	case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ:
 		vht_cap->cap |= cap_info &
 				IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
 		break;
 	default:
 		/* nothing */
 		break;
 	}

 	/* symmetric capabilities */
 	vht_cap->cap |= cap_info & own_cap.cap &
 			(IEEE80211_VHT_CAP_SHORT_GI_80 |
 			 IEEE80211_VHT_CAP_SHORT_GI_160);

 	/* remaining ones */
 	if (own_cap.cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE)
 		vht_cap->cap |= cap_info &
 				(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE |
 				 IEEE80211_VHT_CAP_SOUNDING_DIMENSIONS_MASK);

 	if (own_cap.cap & IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)
 		vht_cap->cap |= cap_info &
 				(IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
 				 IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK);

 	if (own_cap.cap & IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE)
 		vht_cap->cap |= cap_info &
 				IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;

 	if (own_cap.cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE)
 		vht_cap->cap |= cap_info &
 				IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE;

 	if (own_cap.cap & IEEE80211_VHT_CAP_TXSTBC)
 		vht_cap->cap |= cap_info & IEEE80211_VHT_CAP_RXSTBC_MASK;

 	if (own_cap.cap & IEEE80211_VHT_CAP_RXSTBC_MASK)
 		vht_cap->cap |= cap_info & IEEE80211_VHT_CAP_TXSTBC;

 	/* Copy peer MCS info, the driver might need them. */
 	memcpy(&vht_cap->vht_mcs, &vht_cap_ie->supp_mcs,
 	       sizeof(struct ieee80211_vht_mcs_info));

 	/* copy EXT_NSS_BW Support value or remove the capability */
 	if (ieee80211_hw_check(&sdata->local->hw, SUPPORTS_VHT_EXT_NSS_BW))
 		vht_cap->cap |= (cap_info & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK);
 	else
 		vht_cap->vht_mcs.tx_highest &=
 			~cpu_to_le16(IEEE80211_VHT_EXT_NSS_BW_CAPABLE);

 	/* but also restrict MCSes */
 	for (i = 0; i < 8; i++) {
 		u16 own_rx, own_tx, peer_rx, peer_tx;

 		own_rx = le16_to_cpu(own_cap.vht_mcs.rx_mcs_map);
 		own_rx = (own_rx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED;

 		own_tx = le16_to_cpu(own_cap.vht_mcs.tx_mcs_map);
 		own_tx = (own_tx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED;

 		peer_rx = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map);
 		peer_rx = (peer_rx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED;

 		peer_tx = le16_to_cpu(vht_cap->vht_mcs.tx_mcs_map);
 		peer_tx = (peer_tx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED;

 		if (peer_tx != IEEE80211_VHT_MCS_NOT_SUPPORTED) {
 			if (own_rx == IEEE80211_VHT_MCS_NOT_SUPPORTED)
 				peer_tx = IEEE80211_VHT_MCS_NOT_SUPPORTED;
 			else if (own_rx < peer_tx)
 				peer_tx = own_rx;
 		}

 		if (peer_rx != IEEE80211_VHT_MCS_NOT_SUPPORTED) {
 			if (own_tx == IEEE80211_VHT_MCS_NOT_SUPPORTED)
 				peer_rx = IEEE80211_VHT_MCS_NOT_SUPPORTED;
 			else if (own_tx < peer_rx)
 				peer_rx = own_tx;
 		}

 		vht_cap->vht_mcs.rx_mcs_map &=
 			~cpu_to_le16(IEEE80211_VHT_MCS_NOT_SUPPORTED << i * 2);
 		vht_cap->vht_mcs.rx_mcs_map |= cpu_to_le16(peer_rx << i * 2);

 		vht_cap->vht_mcs.tx_mcs_map &=
 			~cpu_to_le16(IEEE80211_VHT_MCS_NOT_SUPPORTED << i * 2);
 		vht_cap->vht_mcs.tx_mcs_map |= cpu_to_le16(peer_tx << i * 2);
 	}

 	/*
 	 * This is a workaround for VHT-enabled STAs which break the spec
 	 * and have the VHT-MCS Rx map filled in with value 3 for all eight
 	 * spacial streams, an example is AR9462.
 	 *
 	 * As per spec, in section 22.1.1 Introduction to the VHT PHY
 	 * A VHT STA shall support at least single spactial stream VHT-MCSs
 	 * 0 to 7 (transmit and receive) in all supported channel widths.
 	 */
 	if (vht_cap->vht_mcs.rx_mcs_map == cpu_to_le16(0xFFFF)) {
 		vht_cap->vht_supported = false;
 		sdata_info(sdata, "Ignoring VHT IE from %pM due to invalid rx_mcs_map\n",
 			   sta->addr);
 		return;
 	}

 	/* finally set up the bandwidth */
 	switch (vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) {
 	case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ:
 	case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ:
 		sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_160;
 		break;
 	default:
 		sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_80;

 		if (!(vht_cap->vht_mcs.tx_highest &
 				cpu_to_le16(IEEE80211_VHT_EXT_NSS_BW_CAPABLE)))
 			break;

 		/*
 		 * If this is non-zero, then it does support 160 MHz after all,
 		 * in one form or the other. We don't distinguish here (or even
 		 * above) between 160 and 80+80 yet.
 		 */
 		if (cap_info & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK)
 			sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_160;
 	}

 	sta->sta.bandwidth = ieee80211_sta_cur_vht_bw(sta);

 	/* If HT IE reported 3839 bytes only, stay with that size. */
 	if (sta->sta.max_amsdu_len == IEEE80211_MAX_MPDU_LEN_HT_3839)
 		return;

 	switch (vht_cap->cap & IEEE80211_VHT_CAP_MAX_MPDU_MASK) {
 	case IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_11454:
 		sta->sta.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_VHT_11454;
 		break;
 	case IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_7991:
 		sta->sta.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_VHT_7991;
 		break;
 	case IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_3895:
 	default:
 		sta->sta.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_VHT_3895;
 		break;
 	}
 }

 enum ieee80211_sta_rx_bandwidth ieee80211_sta_cap_rx_bw(struct sta_info *sta)
 {
 	struct ieee80211_sta_vht_cap *vht_cap = &sta->sta.vht_cap;
 	u32 cap_width;

 	if (!vht_cap->vht_supported)
 		return sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
 				IEEE80211_STA_RX_BW_40 :
 				IEEE80211_STA_RX_BW_20;

 	cap_width = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;

 	if (cap_width == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ ||
 	    cap_width == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
 		return IEEE80211_STA_RX_BW_160;

 	return IEEE80211_STA_RX_BW_80;
 }

 enum nl80211_chan_width ieee80211_sta_cap_chan_bw(struct sta_info *sta)
 {
 	struct ieee80211_sta_vht_cap *vht_cap = &sta->sta.vht_cap;
 	u32 cap_width;

 	if (!vht_cap->vht_supported) {
 		if (!sta->sta.ht_cap.ht_supported)
 			return NL80211_CHAN_WIDTH_20_NOHT;

 		return sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
 				NL80211_CHAN_WIDTH_40 : NL80211_CHAN_WIDTH_20;
 	}

 	cap_width = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;

 	if (cap_width == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ)
 		return NL80211_CHAN_WIDTH_160;
 	else if (cap_width == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
 		return NL80211_CHAN_WIDTH_80P80;

 	return NL80211_CHAN_WIDTH_80;
 }

 enum nl80211_chan_width
 ieee80211_sta_rx_bw_to_chan_width(struct sta_info *sta)
 {
 	enum ieee80211_sta_rx_bandwidth cur_bw = sta->sta.bandwidth;
 	struct ieee80211_sta_vht_cap *vht_cap = &sta->sta.vht_cap;
 	u32 cap_width;

 	switch (cur_bw) {
 	case IEEE80211_STA_RX_BW_20:
 		if (!sta->sta.ht_cap.ht_supported)
 			return NL80211_CHAN_WIDTH_20_NOHT;
 		else
 			return NL80211_CHAN_WIDTH_20;
 	case IEEE80211_STA_RX_BW_40:
 		return NL80211_CHAN_WIDTH_40;
 	case IEEE80211_STA_RX_BW_80:
 		return NL80211_CHAN_WIDTH_80;
 	case IEEE80211_STA_RX_BW_160:
 		cap_width =
 			vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;

 		if (cap_width == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ)
 			return NL80211_CHAN_WIDTH_160;

 		return NL80211_CHAN_WIDTH_80P80;
 	default:
 		return NL80211_CHAN_WIDTH_20;
 	}
 }

 enum ieee80211_sta_rx_bandwidth
 ieee80211_chan_width_to_rx_bw(enum nl80211_chan_width width)
 {
 	switch (width) {
 	case NL80211_CHAN_WIDTH_20_NOHT:
 	case NL80211_CHAN_WIDTH_20:
 		return IEEE80211_STA_RX_BW_20;
 	case NL80211_CHAN_WIDTH_40:
 		return IEEE80211_STA_RX_BW_40;
 	case NL80211_CHAN_WIDTH_80:
 		return IEEE80211_STA_RX_BW_80;
 	case NL80211_CHAN_WIDTH_160:
 	case NL80211_CHAN_WIDTH_80P80:
 		return IEEE80211_STA_RX_BW_160;
 	default:
 		WARN_ON_ONCE(1);
 		return IEEE80211_STA_RX_BW_20;
 	}
 }

 enum ieee80211_sta_rx_bandwidth ieee80211_sta_cur_vht_bw(struct sta_info *sta)
 {
 	struct ieee80211_sub_if_data *sdata = sta->sdata;
 	enum ieee80211_sta_rx_bandwidth bw;
 	enum nl80211_chan_width bss_width = sdata->vif.bss_conf.chandef.width;

 	bw = ieee80211_sta_cap_rx_bw(sta);
 	bw = min(bw, sta->cur_max_bandwidth);

 	/* Don't consider AP's bandwidth for TDLS peers, section 11.23.1 of
 	 * IEEE80211-2016 specification makes higher bandwidth operation
 	 * possible on the TDLS link if the peers have wider bandwidth
 	 * capability.
 	 */
 	if (test_sta_flag(sta, WLAN_STA_TDLS_PEER) &&
 	    test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
 		return bw;

 	bw = min(bw, ieee80211_chan_width_to_rx_bw(bss_width));

 	return bw;
 }

 void ieee80211_sta_set_rx_nss(struct sta_info *sta)
 {
 	u8 ht_rx_nss = 0, vht_rx_nss = 0;

 	/* if we received a notification already don't overwrite it */
 	if (sta->sta.rx_nss)
 		return;

 	if (sta->sta.ht_cap.ht_supported) {
 		if (sta->sta.ht_cap.mcs.rx_mask[0])
 			ht_rx_nss++;
 		if (sta->sta.ht_cap.mcs.rx_mask[1])
 			ht_rx_nss++;
 		if (sta->sta.ht_cap.mcs.rx_mask[2])
 			ht_rx_nss++;
 		if (sta->sta.ht_cap.mcs.rx_mask[3])
 			ht_rx_nss++;
 		/* FIXME: consider rx_highest? */
 	}

 	if (sta->sta.vht_cap.vht_supported) {
 		int i;
 		u16 rx_mcs_map;

 		rx_mcs_map = le16_to_cpu(sta->sta.vht_cap.vht_mcs.rx_mcs_map);

 		for (i = 7; i >= 0; i--) {
 			u8 mcs = (rx_mcs_map >> (2 * i)) & 3;

 			if (mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED) {
 				vht_rx_nss = i + 1;
 				break;
 			}
 		}
 		/* FIXME: consider rx_highest? */
 	}

 	ht_rx_nss = max(ht_rx_nss, vht_rx_nss);
 	sta->sta.rx_nss = max_t(u8, 1, ht_rx_nss);
 }

 u32 __ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata,
 				  struct sta_info *sta, u8 opmode,
 				  enum nl80211_band band)
 {
 	enum ieee80211_sta_rx_bandwidth new_bw;
 	struct sta_opmode_info sta_opmode = {};
 	u32 changed = 0;
 	u8 nss;

 	/* ignore - no support for BF yet */
 	if (opmode & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)
 		return 0;

 	nss = opmode & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
 	nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
 	nss += 1;

 	if (sta->sta.rx_nss != nss) {
 		sta->sta.rx_nss = nss;
 		sta_opmode.rx_nss = nss;
 		changed |= IEEE80211_RC_NSS_CHANGED;
 		sta_opmode.changed |= STA_OPMODE_N_SS_CHANGED;
 	}

 	switch (opmode & IEEE80211_OPMODE_NOTIF_CHANWIDTH_MASK) {
 	case IEEE80211_OPMODE_NOTIF_CHANWIDTH_20MHZ:
 		sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_20;
 		break;
 	case IEEE80211_OPMODE_NOTIF_CHANWIDTH_40MHZ:
 		sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_40;
 		break;
 	case IEEE80211_OPMODE_NOTIF_CHANWIDTH_80MHZ:
 		sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_80;
 		break;
 	case IEEE80211_OPMODE_NOTIF_CHANWIDTH_160MHZ:
 		sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_160;
 		break;
 	}

 	new_bw = ieee80211_sta_cur_vht_bw(sta);
 	if (new_bw != sta->sta.bandwidth) {
 		sta->sta.bandwidth = new_bw;
 		sta_opmode.bw = ieee80211_sta_rx_bw_to_chan_width(sta);
 		changed |= IEEE80211_RC_BW_CHANGED;
 		sta_opmode.changed |= STA_OPMODE_MAX_BW_CHANGED;
 	}

 	if (sta_opmode.changed)
 		cfg80211_sta_opmode_change_notify(sdata->dev, sta->addr,
 						  &sta_opmode, GFP_KERNEL);

 	return changed;
 }

 void ieee80211_process_mu_groups(struct ieee80211_sub_if_data *sdata,
 				 struct ieee80211_mgmt *mgmt)
 {
 	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;

 	if (!sdata->vif.mu_mimo_owner)
 		return;

 	if (!memcmp(mgmt->u.action.u.vht_group_notif.position,
 		    bss_conf->mu_group.position, WLAN_USER_POSITION_LEN) &&
 	    !memcmp(mgmt->u.action.u.vht_group_notif.membership,
 		    bss_conf->mu_group.membership, WLAN_MEMBERSHIP_LEN))
 		return;

 	memcpy(bss_conf->mu_group.membership,
 	       mgmt->u.action.u.vht_group_notif.membership,
 	       WLAN_MEMBERSHIP_LEN);
 	memcpy(bss_conf->mu_group.position,
 	       mgmt->u.action.u.vht_group_notif.position,
 	       WLAN_USER_POSITION_LEN);

 	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_MU_GROUPS);
 }

 void ieee80211_update_mu_groups(struct ieee80211_vif *vif,
 				const u8 *membership, const u8 *position)
 {
 	struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;

 	if (WARN_ON_ONCE(!vif->mu_mimo_owner))
 		return;

 	memcpy(bss_conf->mu_group.membership, membership, WLAN_MEMBERSHIP_LEN);
 	memcpy(bss_conf->mu_group.position, position, WLAN_USER_POSITION_LEN);
 }
 EXPORT_SYMBOL_GPL(ieee80211_update_mu_groups);

 void ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata,
 				 struct sta_info *sta, u8 opmode,
 				 enum nl80211_band band)
 {
 	struct ieee80211_local *local = sdata->local;
 	struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];

 	u32 changed = __ieee80211_vht_handle_opmode(sdata, sta, opmode, band);

 	if (changed > 0) {
 		ieee80211_recalc_min_chandef(sdata);
 		rate_control_rate_update(local, sband, sta, changed);
 	}
 }

 void ieee80211_get_vht_mask_from_cap(__le16 vht_cap,
 				     u16 vht_mask[NL80211_VHT_NSS_MAX])
 {
 	int i;
 	u16 mask, cap = le16_to_cpu(vht_cap);

 	for (i = 0; i < NL80211_VHT_NSS_MAX; i++) {
 		mask = (cap >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
 		switch (mask) {
 		case IEEE80211_VHT_MCS_SUPPORT_0_7:
 			vht_mask[i] = 0x00FF;
 			break;
 		case IEEE80211_VHT_MCS_SUPPORT_0_8:
 			vht_mask[i] = 0x01FF;
 			break;
 		case IEEE80211_VHT_MCS_SUPPORT_0_9:
 			vht_mask[i] = 0x03FF;
 			break;
 		case IEEE80211_VHT_MCS_NOT_SUPPORTED:
 		default:
 			vht_mask[i] = 0;
 			break;
 		}
 	}
 }
	/*
	* VHT handling
	*
	* Portions of this file
	* Copyright(c) 2015 - 2016 Intel Deutschland GmbH
	* Copyright (C) 2018 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_vhtcap_disable(struct ieee80211_sub_if_data *sdata,
	struct ieee80211_sta_vht_cap *vht_cap,
	u32 flag)
	{
	__le32 le_flag = cpu_to_le32(flag);

	if (sdata->u.mgd.vht_capa_mask.vht_cap_info & le_flag &&
	!(sdata->u.mgd.vht_capa.vht_cap_info & le_flag))
	vht_cap->cap &= ~flag;
	}

	void ieee80211_apply_vhtcap_overrides(struct ieee80211_sub_if_data *sdata,
	struct ieee80211_sta_vht_cap *vht_cap)
	{
	int i;
	u16 rxmcs_mask, rxmcs_cap, rxmcs_n, txmcs_mask, txmcs_cap, txmcs_n;

	if (!vht_cap->vht_supported)
	return;

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

	__check_vhtcap_disable(sdata, vht_cap,
	IEEE80211_VHT_CAP_RXLDPC);
	__check_vhtcap_disable(sdata, vht_cap,
	IEEE80211_VHT_CAP_SHORT_GI_80);
	__check_vhtcap_disable(sdata, vht_cap,
	IEEE80211_VHT_CAP_SHORT_GI_160);
	__check_vhtcap_disable(sdata, vht_cap,
	IEEE80211_VHT_CAP_TXSTBC);
	__check_vhtcap_disable(sdata, vht_cap,
	IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE);
	__check_vhtcap_disable(sdata, vht_cap,
	IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE);
	__check_vhtcap_disable(sdata, vht_cap,
	IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN);
	__check_vhtcap_disable(sdata, vht_cap,
	IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN);

	/* Allow user to decrease AMPDU length exponent */
	if (sdata->u.mgd.vht_capa_mask.vht_cap_info &
	cpu_to_le32(IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK)) {
	u32 cap, n;

	n = le32_to_cpu(sdata->u.mgd.vht_capa.vht_cap_info) &
	IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK;
	n >>= IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_SHIFT;
	cap = vht_cap->cap & IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK;
	cap >>= IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_SHIFT;

	if (n < cap) {
	vht_cap->cap &=
	~IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK;
	vht_cap->cap \|=
	n << IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_SHIFT;
	}
	}

	/* Allow the user to decrease MCSes */
	rxmcs_mask =
	le16_to_cpu(sdata->u.mgd.vht_capa_mask.supp_mcs.rx_mcs_map);
	rxmcs_n = le16_to_cpu(sdata->u.mgd.vht_capa.supp_mcs.rx_mcs_map);
	rxmcs_n &= rxmcs_mask;
	rxmcs_cap = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map);

	txmcs_mask =
	le16_to_cpu(sdata->u.mgd.vht_capa_mask.supp_mcs.tx_mcs_map);
	txmcs_n = le16_to_cpu(sdata->u.mgd.vht_capa.supp_mcs.tx_mcs_map);
	txmcs_n &= txmcs_mask;
	txmcs_cap = le16_to_cpu(vht_cap->vht_mcs.tx_mcs_map);
	for (i = 0; i < 8; i++) {
	u8 m, n, c;

	m = (rxmcs_mask >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
	n = (rxmcs_n >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
	c = (rxmcs_cap >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;

	if (m && ((c != IEEE80211_VHT_MCS_NOT_SUPPORTED && n < c) \|\|
	n == IEEE80211_VHT_MCS_NOT_SUPPORTED)) {
	rxmcs_cap &= ~(3 << 2*i);
	rxmcs_cap \|= (rxmcs_n & (3 << 2*i));
	}

	m = (txmcs_mask >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
	n = (txmcs_n >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
	c = (txmcs_cap >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;

	if (m && ((c != IEEE80211_VHT_MCS_NOT_SUPPORTED && n < c) \|\|
	n == IEEE80211_VHT_MCS_NOT_SUPPORTED)) {
	txmcs_cap &= ~(3 << 2*i);
	txmcs_cap \|= (txmcs_n & (3 << 2*i));
	}
	}
	vht_cap->vht_mcs.rx_mcs_map = cpu_to_le16(rxmcs_cap);
	vht_cap->vht_mcs.tx_mcs_map = cpu_to_le16(txmcs_cap);
	}

	void
	ieee80211_vht_cap_ie_to_sta_vht_cap(struct ieee80211_sub_if_data *sdata,
	struct ieee80211_supported_band *sband,
	const struct ieee80211_vht_cap *vht_cap_ie,
	struct sta_info *sta)
	{
	struct ieee80211_sta_vht_cap *vht_cap = &sta->sta.vht_cap;
	struct ieee80211_sta_vht_cap own_cap;
	u32 cap_info, i;
	bool have_80mhz;

	memset(vht_cap, 0, sizeof(*vht_cap));

	if (!sta->sta.ht_cap.ht_supported)
	return;

	if (!vht_cap_ie \|\| !sband->vht_cap.vht_supported)
	return;

	/* Allow VHT if at least one channel on the sband supports 80 MHz */
	have_80mhz = false;
	for (i = 0; i < sband->n_channels; i++) {
	if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED \|
	IEEE80211_CHAN_NO_80MHZ))
	continue;

	have_80mhz = true;
	break;
	}

	if (!have_80mhz)
	return;

	/*
	* A VHT STA must support 40 MHz, but if we verify that here
	* then we break a few things - some APs (e.g. Netgear R6300v2
	* and others based on the BCM4360 chipset) will unset this
	* capability bit when operating in 20 MHz.
	*/

	vht_cap->vht_supported = true;

	own_cap = sband->vht_cap;
	/*
	* If user has specified capability overrides, take care
	* of that if the station we're setting up is the AP that
	* we advertised a restricted capability set to. Override
	* our own capabilities and then use those below.
	*/
	if (sdata->vif.type == NL80211_IFTYPE_STATION &&
	!test_sta_flag(sta, WLAN_STA_TDLS_PEER))
	ieee80211_apply_vhtcap_overrides(sdata, &own_cap);

	/* take some capabilities as-is */
	cap_info = le32_to_cpu(vht_cap_ie->vht_cap_info);
	vht_cap->cap = cap_info;
	vht_cap->cap &= IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_3895 \|
	IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_7991 \|
	IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_11454 \|
	IEEE80211_VHT_CAP_RXLDPC \|
	IEEE80211_VHT_CAP_VHT_TXOP_PS \|
	IEEE80211_VHT_CAP_HTC_VHT \|
	IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK \|
	IEEE80211_VHT_CAP_VHT_LINK_ADAPTATION_VHT_UNSOL_MFB \|
	IEEE80211_VHT_CAP_VHT_LINK_ADAPTATION_VHT_MRQ_MFB \|
	IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN \|
	IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN;

	/* and some based on our own capabilities */
	switch (own_cap.cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) {
	case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ:
	vht_cap->cap \|= cap_info &
	IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
	break;
	case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ:
	vht_cap->cap \|= cap_info &
	IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
	break;
	default:
	/* nothing */
	break;
	}

	/* symmetric capabilities */
	vht_cap->cap \|= cap_info & own_cap.cap &
	(IEEE80211_VHT_CAP_SHORT_GI_80 \|
	IEEE80211_VHT_CAP_SHORT_GI_160);

	/* remaining ones */
	if (own_cap.cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE)
	vht_cap->cap \|= cap_info &
	(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE \|
	IEEE80211_VHT_CAP_SOUNDING_DIMENSIONS_MASK);

	if (own_cap.cap & IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)
	vht_cap->cap \|= cap_info &
	(IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE \|
	IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK);

	if (own_cap.cap & IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE)
	vht_cap->cap \|= cap_info &
	IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;

	if (own_cap.cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE)
	vht_cap->cap \|= cap_info &
	IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE;

	if (own_cap.cap & IEEE80211_VHT_CAP_TXSTBC)
	vht_cap->cap \|= cap_info & IEEE80211_VHT_CAP_RXSTBC_MASK;

	if (own_cap.cap & IEEE80211_VHT_CAP_RXSTBC_MASK)
	vht_cap->cap \|= cap_info & IEEE80211_VHT_CAP_TXSTBC;

	/* Copy peer MCS info, the driver might need them. */
	memcpy(&vht_cap->vht_mcs, &vht_cap_ie->supp_mcs,
	sizeof(struct ieee80211_vht_mcs_info));

	/* copy EXT_NSS_BW Support value or remove the capability */
	if (ieee80211_hw_check(&sdata->local->hw, SUPPORTS_VHT_EXT_NSS_BW))
	vht_cap->cap \|= (cap_info & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK);
	else
	vht_cap->vht_mcs.tx_highest &=
	~cpu_to_le16(IEEE80211_VHT_EXT_NSS_BW_CAPABLE);

	/* but also restrict MCSes */
	for (i = 0; i < 8; i++) {
	u16 own_rx, own_tx, peer_rx, peer_tx;

	own_rx = le16_to_cpu(own_cap.vht_mcs.rx_mcs_map);
	own_rx = (own_rx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED;

	own_tx = le16_to_cpu(own_cap.vht_mcs.tx_mcs_map);
	own_tx = (own_tx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED;

	peer_rx = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map);
	peer_rx = (peer_rx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED;

	peer_tx = le16_to_cpu(vht_cap->vht_mcs.tx_mcs_map);
	peer_tx = (peer_tx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED;

	if (peer_tx != IEEE80211_VHT_MCS_NOT_SUPPORTED) {
	if (own_rx == IEEE80211_VHT_MCS_NOT_SUPPORTED)
	peer_tx = IEEE80211_VHT_MCS_NOT_SUPPORTED;
	else if (own_rx < peer_tx)
	peer_tx = own_rx;
	}

	if (peer_rx != IEEE80211_VHT_MCS_NOT_SUPPORTED) {
	if (own_tx == IEEE80211_VHT_MCS_NOT_SUPPORTED)
	peer_rx = IEEE80211_VHT_MCS_NOT_SUPPORTED;
	else if (own_tx < peer_rx)
	peer_rx = own_tx;
	}

	vht_cap->vht_mcs.rx_mcs_map &=
	~cpu_to_le16(IEEE80211_VHT_MCS_NOT_SUPPORTED << i * 2);
	vht_cap->vht_mcs.rx_mcs_map \|= cpu_to_le16(peer_rx << i * 2);

	vht_cap->vht_mcs.tx_mcs_map &=
	~cpu_to_le16(IEEE80211_VHT_MCS_NOT_SUPPORTED << i * 2);
	vht_cap->vht_mcs.tx_mcs_map \|= cpu_to_le16(peer_tx << i * 2);
	}

	/*
	* This is a workaround for VHT-enabled STAs which break the spec
	* and have the VHT-MCS Rx map filled in with value 3 for all eight
	* spacial streams, an example is AR9462.
	*
	* As per spec, in section 22.1.1 Introduction to the VHT PHY
	* A VHT STA shall support at least single spactial stream VHT-MCSs
	* 0 to 7 (transmit and receive) in all supported channel widths.
	*/
	if (vht_cap->vht_mcs.rx_mcs_map == cpu_to_le16(0xFFFF)) {
	vht_cap->vht_supported = false;
	sdata_info(sdata, "Ignoring VHT IE from %pM due to invalid rx_mcs_map\n",
	sta->addr);
	return;
	}

	/* finally set up the bandwidth */
	switch (vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) {
	case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ:
	case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ:
	sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_160;
	break;
	default:
	sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_80;

	if (!(vht_cap->vht_mcs.tx_highest &
	cpu_to_le16(IEEE80211_VHT_EXT_NSS_BW_CAPABLE)))
	break;

	/*
	* If this is non-zero, then it does support 160 MHz after all,
	* in one form or the other. We don't distinguish here (or even
	* above) between 160 and 80+80 yet.
	*/
	if (cap_info & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK)
	sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_160;
	}

	sta->sta.bandwidth = ieee80211_sta_cur_vht_bw(sta);

	/* If HT IE reported 3839 bytes only, stay with that size. */
	if (sta->sta.max_amsdu_len == IEEE80211_MAX_MPDU_LEN_HT_3839)
	return;

	switch (vht_cap->cap & IEEE80211_VHT_CAP_MAX_MPDU_MASK) {
	case IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_11454:
	sta->sta.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_VHT_11454;
	break;
	case IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_7991:
	sta->sta.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_VHT_7991;
	break;
	case IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_3895:
	default:
	sta->sta.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_VHT_3895;
	break;
	}
	}

	enum ieee80211_sta_rx_bandwidth ieee80211_sta_cap_rx_bw(struct sta_info *sta)
	{
	struct ieee80211_sta_vht_cap *vht_cap = &sta->sta.vht_cap;
	u32 cap_width;

	if (!vht_cap->vht_supported)
	return sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
	IEEE80211_STA_RX_BW_40 :
	IEEE80211_STA_RX_BW_20;

	cap_width = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;

	if (cap_width == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ \|\|
	cap_width == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
	return IEEE80211_STA_RX_BW_160;

	return IEEE80211_STA_RX_BW_80;
	}

	enum nl80211_chan_width ieee80211_sta_cap_chan_bw(struct sta_info *sta)
	{
	struct ieee80211_sta_vht_cap *vht_cap = &sta->sta.vht_cap;
	u32 cap_width;

	if (!vht_cap->vht_supported) {
	if (!sta->sta.ht_cap.ht_supported)
	return NL80211_CHAN_WIDTH_20_NOHT;

	return sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
	NL80211_CHAN_WIDTH_40 : NL80211_CHAN_WIDTH_20;
	}

	cap_width = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;

	if (cap_width == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ)
	return NL80211_CHAN_WIDTH_160;
	else if (cap_width == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
	return NL80211_CHAN_WIDTH_80P80;

	return NL80211_CHAN_WIDTH_80;
	}

	enum nl80211_chan_width
	ieee80211_sta_rx_bw_to_chan_width(struct sta_info *sta)
	{
	enum ieee80211_sta_rx_bandwidth cur_bw = sta->sta.bandwidth;
	struct ieee80211_sta_vht_cap *vht_cap = &sta->sta.vht_cap;
	u32 cap_width;

	switch (cur_bw) {
	case IEEE80211_STA_RX_BW_20:
	if (!sta->sta.ht_cap.ht_supported)
	return NL80211_CHAN_WIDTH_20_NOHT;
	else
	return NL80211_CHAN_WIDTH_20;
	case IEEE80211_STA_RX_BW_40:
	return NL80211_CHAN_WIDTH_40;
	case IEEE80211_STA_RX_BW_80:
	return NL80211_CHAN_WIDTH_80;
	case IEEE80211_STA_RX_BW_160:
	cap_width =
	vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;

	if (cap_width == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ)
	return NL80211_CHAN_WIDTH_160;

	return NL80211_CHAN_WIDTH_80P80;
	default:
	return NL80211_CHAN_WIDTH_20;
	}
	}

	enum ieee80211_sta_rx_bandwidth
	ieee80211_chan_width_to_rx_bw(enum nl80211_chan_width width)
	{
	switch (width) {
	case NL80211_CHAN_WIDTH_20_NOHT:
	case NL80211_CHAN_WIDTH_20:
	return IEEE80211_STA_RX_BW_20;
	case NL80211_CHAN_WIDTH_40:
	return IEEE80211_STA_RX_BW_40;
	case NL80211_CHAN_WIDTH_80:
	return IEEE80211_STA_RX_BW_80;
	case NL80211_CHAN_WIDTH_160:
	case NL80211_CHAN_WIDTH_80P80:
	return IEEE80211_STA_RX_BW_160;
	default:
	WARN_ON_ONCE(1);
	return IEEE80211_STA_RX_BW_20;
	}
	}

	enum ieee80211_sta_rx_bandwidth ieee80211_sta_cur_vht_bw(struct sta_info *sta)
	{
	struct ieee80211_sub_if_data *sdata = sta->sdata;
	enum ieee80211_sta_rx_bandwidth bw;
	enum nl80211_chan_width bss_width = sdata->vif.bss_conf.chandef.width;

	bw = ieee80211_sta_cap_rx_bw(sta);
	bw = min(bw, sta->cur_max_bandwidth);

	/* Don't consider AP's bandwidth for TDLS peers, section 11.23.1 of
	* IEEE80211-2016 specification makes higher bandwidth operation
	* possible on the TDLS link if the peers have wider bandwidth
	* capability.
	*/
	if (test_sta_flag(sta, WLAN_STA_TDLS_PEER) &&
	test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
	return bw;

	bw = min(bw, ieee80211_chan_width_to_rx_bw(bss_width));

	return bw;
	}

	void ieee80211_sta_set_rx_nss(struct sta_info *sta)
	{
	u8 ht_rx_nss = 0, vht_rx_nss = 0;

	/* if we received a notification already don't overwrite it */
	if (sta->sta.rx_nss)
	return;

	if (sta->sta.ht_cap.ht_supported) {
	if (sta->sta.ht_cap.mcs.rx_mask[0])
	ht_rx_nss++;
	if (sta->sta.ht_cap.mcs.rx_mask[1])
	ht_rx_nss++;
	if (sta->sta.ht_cap.mcs.rx_mask[2])
	ht_rx_nss++;
	if (sta->sta.ht_cap.mcs.rx_mask[3])
	ht_rx_nss++;
	/* FIXME: consider rx_highest? */
	}

	if (sta->sta.vht_cap.vht_supported) {
	int i;
	u16 rx_mcs_map;

	rx_mcs_map = le16_to_cpu(sta->sta.vht_cap.vht_mcs.rx_mcs_map);

	for (i = 7; i >= 0; i--) {
	u8 mcs = (rx_mcs_map >> (2 * i)) & 3;

	if (mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED) {
	vht_rx_nss = i + 1;
	break;
	}
	}
	/* FIXME: consider rx_highest? */
	}

	ht_rx_nss = max(ht_rx_nss, vht_rx_nss);
	sta->sta.rx_nss = max_t(u8, 1, ht_rx_nss);
	}

	u32 __ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata,
	struct sta_info *sta, u8 opmode,
	enum nl80211_band band)
	{
	enum ieee80211_sta_rx_bandwidth new_bw;
	struct sta_opmode_info sta_opmode = {};
	u32 changed = 0;
	u8 nss;

	/* ignore - no support for BF yet */
	if (opmode & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)
	return 0;

	nss = opmode & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
	nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
	nss += 1;

	if (sta->sta.rx_nss != nss) {
	sta->sta.rx_nss = nss;
	sta_opmode.rx_nss = nss;
	changed \|= IEEE80211_RC_NSS_CHANGED;
	sta_opmode.changed \|= STA_OPMODE_N_SS_CHANGED;
	}

	switch (opmode & IEEE80211_OPMODE_NOTIF_CHANWIDTH_MASK) {
	case IEEE80211_OPMODE_NOTIF_CHANWIDTH_20MHZ:
	sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_20;
	break;
	case IEEE80211_OPMODE_NOTIF_CHANWIDTH_40MHZ:
	sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_40;
	break;
	case IEEE80211_OPMODE_NOTIF_CHANWIDTH_80MHZ:
	sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_80;
	break;
	case IEEE80211_OPMODE_NOTIF_CHANWIDTH_160MHZ:
	sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_160;
	break;
	}

	new_bw = ieee80211_sta_cur_vht_bw(sta);
	if (new_bw != sta->sta.bandwidth) {
	sta->sta.bandwidth = new_bw;
	sta_opmode.bw = ieee80211_sta_rx_bw_to_chan_width(sta);
	changed \|= IEEE80211_RC_BW_CHANGED;
	sta_opmode.changed \|= STA_OPMODE_MAX_BW_CHANGED;
	}

	if (sta_opmode.changed)
	cfg80211_sta_opmode_change_notify(sdata->dev, sta->addr,
	&sta_opmode, GFP_KERNEL);

	return changed;
	}

	void ieee80211_process_mu_groups(struct ieee80211_sub_if_data *sdata,
	struct ieee80211_mgmt *mgmt)
	{
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;

	if (!sdata->vif.mu_mimo_owner)
	return;

	if (!memcmp(mgmt->u.action.u.vht_group_notif.position,
	bss_conf->mu_group.position, WLAN_USER_POSITION_LEN) &&
	!memcmp(mgmt->u.action.u.vht_group_notif.membership,
	bss_conf->mu_group.membership, WLAN_MEMBERSHIP_LEN))
	return;

	memcpy(bss_conf->mu_group.membership,
	mgmt->u.action.u.vht_group_notif.membership,
	WLAN_MEMBERSHIP_LEN);
	memcpy(bss_conf->mu_group.position,
	mgmt->u.action.u.vht_group_notif.position,
	WLAN_USER_POSITION_LEN);

	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_MU_GROUPS);
	}

	void ieee80211_update_mu_groups(struct ieee80211_vif *vif,
	const u8 membership, const u8 position)
	{
	struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;

	if (WARN_ON_ONCE(!vif->mu_mimo_owner))
	return;

	memcpy(bss_conf->mu_group.membership, membership, WLAN_MEMBERSHIP_LEN);
	memcpy(bss_conf->mu_group.position, position, WLAN_USER_POSITION_LEN);
	}
	EXPORT_SYMBOL_GPL(ieee80211_update_mu_groups);

	void ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata,
	struct sta_info *sta, u8 opmode,
	enum nl80211_band band)
	{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];

	u32 changed = __ieee80211_vht_handle_opmode(sdata, sta, opmode, band);

	if (changed > 0) {
	ieee80211_recalc_min_chandef(sdata);
	rate_control_rate_update(local, sband, sta, changed);
	}
	}

	void ieee80211_get_vht_mask_from_cap(__le16 vht_cap,
	u16 vht_mask[NL80211_VHT_NSS_MAX])
	{
	int i;
	u16 mask, cap = le16_to_cpu(vht_cap);

	for (i = 0; i < NL80211_VHT_NSS_MAX; i++) {
	mask = (cap >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
	switch (mask) {
	case IEEE80211_VHT_MCS_SUPPORT_0_7:
	vht_mask[i] = 0x00FF;
	break;
	case IEEE80211_VHT_MCS_SUPPORT_0_8:
	vht_mask[i] = 0x01FF;
	break;
	case IEEE80211_VHT_MCS_SUPPORT_0_9:
	vht_mask[i] = 0x03FF;
	break;
	case IEEE80211_VHT_MCS_NOT_SUPPORTED:
	default:
	vht_mask[i] = 0;
	break;
	}
	}
	}