forked from Minki/linux
e1a0c6b3a4
For VHT, many more bandwidth changes are possible. As a first step, stop toggling the IEEE80211_HT_CAP_SUP_WIDTH_20_40 flag in the HT capabilities and instead introduce a bandwidth field indicating the currently usable bandwidth to transmit to the station. Of course, make all drivers use it. To achieve this, make ieee80211_ht_cap_ie_to_sta_ht_cap() get the station as an argument, rather than the new capabilities, so it can set up the new bandwidth field. If the station is a VHT station and VHT bandwidth is in use, also set the bandwidth accordingly. Doing this allows us to get rid of the supports_40mhz flag as the HT capabilities now reflect the true capability instead of the current setting. While at it, also fix ieee80211_ht_cap_ie_to_sta_ht_cap() to not ignore HT cap overrides when MCS TX isn't supported (not that it really happens...) Signed-off-by: Johannes Berg <johannes.berg@intel.com>
77 lines
2.1 KiB
C
77 lines
2.1 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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void 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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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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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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/* 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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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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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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if (!sta->sta.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 : IEEE80211_STA_RX_BW_20;
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/* TODO: handle VHT opmode notification data */
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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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return sta->sta.ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
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IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20;
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case NL80211_CHAN_WIDTH_160:
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if (cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ)
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return IEEE80211_STA_RX_BW_160;
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/* fall through */
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case NL80211_CHAN_WIDTH_80P80:
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if (cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
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return IEEE80211_STA_RX_BW_160;
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/* fall through */
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case NL80211_CHAN_WIDTH_80:
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return IEEE80211_STA_RX_BW_80;
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}
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}
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