2012-10-10 11:33:04 +00:00
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/*
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* VHT handling
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/ieee80211.h>
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#include <linux/export.h>
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#include <net/mac80211.h>
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#include "ieee80211_i.h"
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2012-12-27 17:55:36 +00:00
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#include "rate.h"
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2012-10-10 11:33:04 +00:00
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2013-02-21 16:40:19 +00:00
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static void __check_vhtcap_disable(struct ieee80211_sub_if_data *sdata,
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struct ieee80211_sta_vht_cap *vht_cap,
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u32 flag)
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{
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__le32 le_flag = cpu_to_le32(flag);
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if (sdata->u.mgd.vht_capa_mask.vht_cap_info & le_flag &&
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!(sdata->u.mgd.vht_capa.vht_cap_info & le_flag))
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vht_cap->cap &= ~flag;
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}
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void ieee80211_apply_vhtcap_overrides(struct ieee80211_sub_if_data *sdata,
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struct ieee80211_sta_vht_cap *vht_cap)
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{
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int i;
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u16 rxmcs_mask, rxmcs_cap, rxmcs_n, txmcs_mask, txmcs_cap, txmcs_n;
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if (!vht_cap->vht_supported)
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return;
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if (sdata->vif.type != NL80211_IFTYPE_STATION)
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return;
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__check_vhtcap_disable(sdata, vht_cap,
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IEEE80211_VHT_CAP_RXLDPC);
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__check_vhtcap_disable(sdata, vht_cap,
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IEEE80211_VHT_CAP_SHORT_GI_80);
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__check_vhtcap_disable(sdata, vht_cap,
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IEEE80211_VHT_CAP_SHORT_GI_160);
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__check_vhtcap_disable(sdata, vht_cap,
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IEEE80211_VHT_CAP_TXSTBC);
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__check_vhtcap_disable(sdata, vht_cap,
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IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE);
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__check_vhtcap_disable(sdata, vht_cap,
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IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE);
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__check_vhtcap_disable(sdata, vht_cap,
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IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN);
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__check_vhtcap_disable(sdata, vht_cap,
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IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN);
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/* Allow user to decrease AMPDU length exponent */
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if (sdata->u.mgd.vht_capa_mask.vht_cap_info &
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cpu_to_le32(IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK)) {
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u32 cap, n;
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n = le32_to_cpu(sdata->u.mgd.vht_capa.vht_cap_info) &
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IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK;
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n >>= IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_SHIFT;
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cap = vht_cap->cap & IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK;
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cap >>= IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_SHIFT;
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if (n < cap) {
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vht_cap->cap &=
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~IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK;
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vht_cap->cap |=
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n << IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_SHIFT;
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}
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}
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/* Allow the user to decrease MCSes */
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rxmcs_mask =
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le16_to_cpu(sdata->u.mgd.vht_capa_mask.supp_mcs.rx_mcs_map);
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rxmcs_n = le16_to_cpu(sdata->u.mgd.vht_capa.supp_mcs.rx_mcs_map);
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rxmcs_n &= rxmcs_mask;
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rxmcs_cap = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map);
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txmcs_mask =
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le16_to_cpu(sdata->u.mgd.vht_capa_mask.supp_mcs.tx_mcs_map);
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txmcs_n = le16_to_cpu(sdata->u.mgd.vht_capa.supp_mcs.tx_mcs_map);
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txmcs_n &= txmcs_mask;
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txmcs_cap = le16_to_cpu(vht_cap->vht_mcs.tx_mcs_map);
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for (i = 0; i < 8; i++) {
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u8 m, n, c;
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m = (rxmcs_mask >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
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n = (rxmcs_n >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
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c = (rxmcs_cap >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
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if (m && ((c != IEEE80211_VHT_MCS_NOT_SUPPORTED && n < c) ||
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n == IEEE80211_VHT_MCS_NOT_SUPPORTED)) {
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rxmcs_cap &= ~(3 << 2*i);
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rxmcs_cap |= (rxmcs_n & (3 << 2*i));
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}
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m = (txmcs_mask >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
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n = (txmcs_n >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
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c = (txmcs_cap >> 2*i) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
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if (m && ((c != IEEE80211_VHT_MCS_NOT_SUPPORTED && n < c) ||
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n == IEEE80211_VHT_MCS_NOT_SUPPORTED)) {
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txmcs_cap &= ~(3 << 2*i);
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txmcs_cap |= (txmcs_n & (3 << 2*i));
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}
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}
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vht_cap->vht_mcs.rx_mcs_map = cpu_to_le16(rxmcs_cap);
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vht_cap->vht_mcs.tx_mcs_map = cpu_to_le16(txmcs_cap);
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}
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2013-02-12 15:43:19 +00:00
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void
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ieee80211_vht_cap_ie_to_sta_vht_cap(struct ieee80211_sub_if_data *sdata,
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struct ieee80211_supported_band *sband,
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const struct ieee80211_vht_cap *vht_cap_ie,
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struct sta_info *sta)
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2012-10-10 11:33:04 +00:00
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{
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2013-02-07 10:58:58 +00:00
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struct ieee80211_sta_vht_cap *vht_cap = &sta->sta.vht_cap;
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2012-10-10 11:33:04 +00:00
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memset(vht_cap, 0, sizeof(*vht_cap));
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2013-02-07 10:58:58 +00:00
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if (!sta->sta.ht_cap.ht_supported)
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return;
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2012-10-10 11:33:04 +00:00
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if (!vht_cap_ie || !sband->vht_cap.vht_supported)
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return;
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2013-02-07 10:47:44 +00:00
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/* A VHT STA must support 40 MHz */
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if (!(sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
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return;
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2012-10-10 11:33:04 +00:00
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vht_cap->vht_supported = true;
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vht_cap->cap = le32_to_cpu(vht_cap_ie->vht_cap_info);
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/* Copy peer MCS info, the driver might need them. */
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memcpy(&vht_cap->vht_mcs, &vht_cap_ie->supp_mcs,
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sizeof(struct ieee80211_vht_mcs_info));
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2013-02-07 10:47:44 +00:00
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2012-12-27 17:55:36 +00:00
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switch (vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) {
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case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ:
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case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ:
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sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_160;
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break;
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default:
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sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_80;
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}
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2013-02-07 10:47:44 +00:00
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sta->sta.bandwidth = ieee80211_sta_cur_vht_bw(sta);
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}
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enum ieee80211_sta_rx_bandwidth ieee80211_sta_cur_vht_bw(struct sta_info *sta)
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{
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struct ieee80211_sub_if_data *sdata = sta->sdata;
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u32 cap = sta->sta.vht_cap.cap;
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2012-12-27 17:55:36 +00:00
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enum ieee80211_sta_rx_bandwidth bw;
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2013-02-07 10:47:44 +00:00
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2012-12-27 17:55:36 +00:00
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if (!sta->sta.vht_cap.vht_supported) {
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bw = sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
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2013-02-07 10:47:44 +00:00
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IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20;
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2012-12-27 17:55:36 +00:00
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goto check_max;
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}
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2013-02-07 10:47:44 +00:00
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switch (sdata->vif.bss_conf.chandef.width) {
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default:
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WARN_ON_ONCE(1);
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/* fall through */
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case NL80211_CHAN_WIDTH_20_NOHT:
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case NL80211_CHAN_WIDTH_20:
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case NL80211_CHAN_WIDTH_40:
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2012-12-27 17:55:36 +00:00
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bw = sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
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2013-02-07 10:47:44 +00:00
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IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20;
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2012-12-27 17:55:36 +00:00
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break;
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2013-02-07 10:47:44 +00:00
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case NL80211_CHAN_WIDTH_160:
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2012-12-27 17:55:36 +00:00
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if ((cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) ==
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IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ) {
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bw = IEEE80211_STA_RX_BW_160;
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break;
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}
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2013-02-07 10:47:44 +00:00
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/* fall through */
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case NL80211_CHAN_WIDTH_80P80:
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2012-12-27 17:55:36 +00:00
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if ((cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) ==
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IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) {
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bw = IEEE80211_STA_RX_BW_160;
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break;
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}
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2013-02-07 10:47:44 +00:00
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/* fall through */
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case NL80211_CHAN_WIDTH_80:
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2012-12-27 17:55:36 +00:00
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bw = IEEE80211_STA_RX_BW_80;
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2013-02-07 10:47:44 +00:00
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}
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2012-12-27 17:55:36 +00:00
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check_max:
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if (bw > sta->cur_max_bandwidth)
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bw = sta->cur_max_bandwidth;
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return bw;
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2012-10-10 11:33:04 +00:00
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}
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2012-12-27 17:26:42 +00:00
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void ieee80211_sta_set_rx_nss(struct sta_info *sta)
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{
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u8 ht_rx_nss = 0, vht_rx_nss = 0;
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/* if we received a notification already don't overwrite it */
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if (sta->sta.rx_nss)
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return;
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if (sta->sta.ht_cap.ht_supported) {
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if (sta->sta.ht_cap.mcs.rx_mask[0])
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ht_rx_nss++;
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if (sta->sta.ht_cap.mcs.rx_mask[1])
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ht_rx_nss++;
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if (sta->sta.ht_cap.mcs.rx_mask[2])
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ht_rx_nss++;
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if (sta->sta.ht_cap.mcs.rx_mask[3])
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ht_rx_nss++;
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/* FIXME: consider rx_highest? */
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}
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if (sta->sta.vht_cap.vht_supported) {
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int i;
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u16 rx_mcs_map;
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rx_mcs_map = le16_to_cpu(sta->sta.vht_cap.vht_mcs.rx_mcs_map);
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for (i = 7; i >= 0; i--) {
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u8 mcs = (rx_mcs_map >> (2 * i)) & 3;
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if (mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED) {
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vht_rx_nss = i + 1;
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break;
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}
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}
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/* FIXME: consider rx_highest? */
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}
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ht_rx_nss = max(ht_rx_nss, vht_rx_nss);
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sta->sta.rx_nss = max_t(u8, 1, ht_rx_nss);
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}
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2012-12-27 17:55:36 +00:00
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void ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata,
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struct sta_info *sta, u8 opmode,
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2013-02-07 21:24:55 +00:00
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enum ieee80211_band band, bool nss_only)
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2012-12-27 17:55:36 +00:00
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{
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struct ieee80211_local *local = sdata->local;
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struct ieee80211_supported_band *sband;
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enum ieee80211_sta_rx_bandwidth new_bw;
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u32 changed = 0;
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u8 nss;
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sband = local->hw.wiphy->bands[band];
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/* ignore - no support for BF yet */
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if (opmode & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)
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return;
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nss = opmode & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
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nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
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nss += 1;
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if (sta->sta.rx_nss != nss) {
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sta->sta.rx_nss = nss;
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changed |= IEEE80211_RC_NSS_CHANGED;
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}
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2013-02-07 21:24:55 +00:00
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if (nss_only)
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goto change;
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2012-12-27 17:55:36 +00:00
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switch (opmode & IEEE80211_OPMODE_NOTIF_CHANWIDTH_MASK) {
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case IEEE80211_OPMODE_NOTIF_CHANWIDTH_20MHZ:
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sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_20;
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break;
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case IEEE80211_OPMODE_NOTIF_CHANWIDTH_40MHZ:
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sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_40;
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break;
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case IEEE80211_OPMODE_NOTIF_CHANWIDTH_80MHZ:
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sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_80;
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break;
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case IEEE80211_OPMODE_NOTIF_CHANWIDTH_160MHZ:
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sta->cur_max_bandwidth = IEEE80211_STA_RX_BW_160;
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break;
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}
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new_bw = ieee80211_sta_cur_vht_bw(sta);
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if (new_bw != sta->sta.bandwidth) {
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sta->sta.bandwidth = new_bw;
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changed |= IEEE80211_RC_NSS_CHANGED;
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}
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2013-02-07 21:24:55 +00:00
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change:
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2012-12-27 17:55:36 +00:00
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if (changed)
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rate_control_rate_update(local, sband, sta, changed);
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}
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