forked from Minki/linux
b98fb44ffc
Allow a device to specify support for the TDLS wider-bandwidth feature. Indicate this support during TDLS setup in the ext-capab IE and set an appropriate station flag when our TDLS peer supports it. This feature gives TDLS peers the ability to use a wider channel than the base width of the BSS. For instance VHT capable TDLS peers connected on a 20MHz channel can extend the channel to 80MHz, if regulatory considerations allow it. Do not cap the bandwidth of such stations by the current BSS channel width in mac80211. Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com> Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
429 lines
13 KiB
C
429 lines
13 KiB
C
/*
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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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#include "rate.h"
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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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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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{
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struct ieee80211_sta_vht_cap *vht_cap = &sta->sta.vht_cap;
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struct ieee80211_sta_vht_cap own_cap;
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u32 cap_info, i;
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memset(vht_cap, 0, sizeof(*vht_cap));
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if (!sta->sta.ht_cap.ht_supported)
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return;
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if (!vht_cap_ie || !sband->vht_cap.vht_supported)
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return;
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/*
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* A VHT STA must support 40 MHz, but if we verify that here
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* then we break a few things - some APs (e.g. Netgear R6300v2
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* and others based on the BCM4360 chipset) will unset this
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* capability bit when operating in 20 MHz.
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*/
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vht_cap->vht_supported = true;
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own_cap = sband->vht_cap;
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/*
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* If user has specified capability overrides, take care
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* of that if the station we're setting up is the AP that
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* we advertised a restricted capability set to. Override
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* our own capabilities and then use those below.
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*/
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if (sdata->vif.type == NL80211_IFTYPE_STATION &&
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!test_sta_flag(sta, WLAN_STA_TDLS_PEER))
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ieee80211_apply_vhtcap_overrides(sdata, &own_cap);
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/* take some capabilities as-is */
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cap_info = le32_to_cpu(vht_cap_ie->vht_cap_info);
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vht_cap->cap = cap_info;
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vht_cap->cap &= IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_3895 |
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IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_7991 |
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IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_11454 |
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IEEE80211_VHT_CAP_RXLDPC |
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IEEE80211_VHT_CAP_VHT_TXOP_PS |
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IEEE80211_VHT_CAP_HTC_VHT |
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IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK |
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IEEE80211_VHT_CAP_VHT_LINK_ADAPTATION_VHT_UNSOL_MFB |
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IEEE80211_VHT_CAP_VHT_LINK_ADAPTATION_VHT_MRQ_MFB |
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IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN |
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IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN;
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/* and some based on our own capabilities */
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switch (own_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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vht_cap->cap |= cap_info &
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IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
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break;
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case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ:
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vht_cap->cap |= cap_info &
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IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
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break;
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default:
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/* nothing */
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break;
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}
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/* symmetric capabilities */
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vht_cap->cap |= cap_info & own_cap.cap &
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(IEEE80211_VHT_CAP_SHORT_GI_80 |
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IEEE80211_VHT_CAP_SHORT_GI_160);
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/* remaining ones */
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if (own_cap.cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE)
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vht_cap->cap |= cap_info &
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(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE |
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IEEE80211_VHT_CAP_SOUNDING_DIMENSIONS_MASK);
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if (own_cap.cap & IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)
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vht_cap->cap |= cap_info &
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(IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
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IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK);
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if (own_cap.cap & IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE)
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vht_cap->cap |= cap_info &
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IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
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if (own_cap.cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE)
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vht_cap->cap |= cap_info &
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IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE;
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if (own_cap.cap & IEEE80211_VHT_CAP_TXSTBC)
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vht_cap->cap |= cap_info & IEEE80211_VHT_CAP_RXSTBC_MASK;
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if (own_cap.cap & IEEE80211_VHT_CAP_RXSTBC_MASK)
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vht_cap->cap |= cap_info & IEEE80211_VHT_CAP_TXSTBC;
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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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/* but also restrict MCSes */
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for (i = 0; i < 8; i++) {
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u16 own_rx, own_tx, peer_rx, peer_tx;
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own_rx = le16_to_cpu(own_cap.vht_mcs.rx_mcs_map);
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own_rx = (own_rx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
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own_tx = le16_to_cpu(own_cap.vht_mcs.tx_mcs_map);
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own_tx = (own_tx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
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peer_rx = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map);
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peer_rx = (peer_rx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
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peer_tx = le16_to_cpu(vht_cap->vht_mcs.tx_mcs_map);
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peer_tx = (peer_tx >> i * 2) & IEEE80211_VHT_MCS_NOT_SUPPORTED;
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if (peer_tx != IEEE80211_VHT_MCS_NOT_SUPPORTED) {
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if (own_rx == IEEE80211_VHT_MCS_NOT_SUPPORTED)
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peer_tx = IEEE80211_VHT_MCS_NOT_SUPPORTED;
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else if (own_rx < peer_tx)
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peer_tx = own_rx;
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}
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if (peer_rx != IEEE80211_VHT_MCS_NOT_SUPPORTED) {
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if (own_tx == IEEE80211_VHT_MCS_NOT_SUPPORTED)
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peer_rx = IEEE80211_VHT_MCS_NOT_SUPPORTED;
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else if (own_tx < peer_rx)
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peer_rx = own_tx;
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}
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vht_cap->vht_mcs.rx_mcs_map &=
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~cpu_to_le16(IEEE80211_VHT_MCS_NOT_SUPPORTED << i * 2);
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vht_cap->vht_mcs.rx_mcs_map |= cpu_to_le16(peer_rx << i * 2);
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vht_cap->vht_mcs.tx_mcs_map &=
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~cpu_to_le16(IEEE80211_VHT_MCS_NOT_SUPPORTED << i * 2);
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vht_cap->vht_mcs.tx_mcs_map |= cpu_to_le16(peer_tx << i * 2);
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}
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/* finally set up the bandwidth */
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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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sta->sta.bandwidth = ieee80211_sta_cur_vht_bw(sta);
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}
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enum ieee80211_sta_rx_bandwidth ieee80211_sta_cap_rx_bw(struct sta_info *sta)
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{
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struct ieee80211_sta_vht_cap *vht_cap = &sta->sta.vht_cap;
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u32 cap_width;
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if (!vht_cap->vht_supported)
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return sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
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IEEE80211_STA_RX_BW_40 :
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IEEE80211_STA_RX_BW_20;
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cap_width = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
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if (cap_width == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ ||
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cap_width == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
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return IEEE80211_STA_RX_BW_160;
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return IEEE80211_STA_RX_BW_80;
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}
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static enum ieee80211_sta_rx_bandwidth
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ieee80211_chan_width_to_rx_bw(enum nl80211_chan_width width)
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{
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switch (width) {
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case NL80211_CHAN_WIDTH_20_NOHT:
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case NL80211_CHAN_WIDTH_20:
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return IEEE80211_STA_RX_BW_20;
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case NL80211_CHAN_WIDTH_40:
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return IEEE80211_STA_RX_BW_40;
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case NL80211_CHAN_WIDTH_80:
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return IEEE80211_STA_RX_BW_80;
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case NL80211_CHAN_WIDTH_160:
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case NL80211_CHAN_WIDTH_80P80:
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return IEEE80211_STA_RX_BW_160;
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default:
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WARN_ON_ONCE(1);
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return IEEE80211_STA_RX_BW_20;
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}
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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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enum ieee80211_sta_rx_bandwidth bw;
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enum nl80211_chan_width bss_width = sdata->vif.bss_conf.chandef.width;
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bw = ieee80211_sta_cap_rx_bw(sta);
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bw = min(bw, sta->cur_max_bandwidth);
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/* do not cap the BW of TDLS WIDER_BW peers by the bss */
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if (!test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW))
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bw = min(bw, ieee80211_chan_width_to_rx_bw(bss_width));
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return bw;
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}
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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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u32 __ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata,
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struct sta_info *sta, u8 opmode,
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enum ieee80211_band band, bool nss_only)
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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 0;
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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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if (nss_only)
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return changed;
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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:
|
|
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);
|
|
}
|