1 files changed, 424 insertions, 0 deletions

diff --git a/net/mac80211/vht.c b/net/mac80211/vht.c
new file mode 100644
index 000000000..80694d55d
--- /dev/null
+++ b/net/mac80211/vht.c
@@ -0,0 +1,424 @@
+/*
+ * VHT handling
+ *
+ * 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;
+
+	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;
+
+	/*
+	 * 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));
+
+	/* 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);
+	}
+
+	/* 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;
+	}
+
+	sta->sta.bandwidth = ieee80211_sta_cur_vht_bw(sta);
+}
+
+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;
+}
+
+static 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;
+
+	bw = ieee80211_chan_width_to_rx_bw(sdata->vif.bss_conf.chandef.width);
+	bw = min(bw, ieee80211_sta_cap_rx_bw(sta));
+	bw = min(bw, sta->cur_max_bandwidth);
+
+	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 ieee80211_band band, bool nss_only)
+{
+	struct ieee80211_local *local = sdata->local;
+	struct ieee80211_supported_band *sband;
+	enum ieee80211_sta_rx_bandwidth new_bw;
+	u32 changed = 0;
+	u8 nss;
+
+	sband = local->hw.wiphy->bands[band];
+
+	/* 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;
+		changed |= IEEE80211_RC_NSS_CHANGED;
+	}
+
+	if (nss_only)
+		return 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;
+		changed |= IEEE80211_RC_BW_CHANGED;
+	}
+
+	return changed;
+}
+
+void ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata,
+				 struct sta_info *sta, u8 opmode,
+				 enum ieee80211_band band, bool nss_only)
+{
+	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, nss_only);
+
+	if (changed > 0)
+		rate_control_rate_update(local, sband, sta, changed);
+}