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ieee80211: add new VHT capability fields/parsing
IEEE 802.11-2016 extended the VHT capability fields to allow indicating the number of spatial streams depending on the actually used bandwidth, add support for decoding this. Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg
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34fb190ec0
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b0aa75f0b1
@ -1460,13 +1460,16 @@ struct ieee80211_ht_operation {
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* STA can receive. Rate expressed in units of 1 Mbps.
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* If this field is 0 this value should not be used to
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* consider the highest RX data rate supported.
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* The top 3 bits of this field are reserved.
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* The top 3 bits of this field indicate the Maximum NSTS,total
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* (a beamformee capability.)
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* @tx_mcs_map: TX MCS map 2 bits for each stream, total 8 streams
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* @tx_highest: Indicates highest long GI VHT PPDU data rate
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* STA can transmit. Rate expressed in units of 1 Mbps.
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* If this field is 0 this value should not be used to
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* consider the highest TX data rate supported.
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* The top 3 bits of this field are reserved.
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* The top 2 bits of this field are reserved, the
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* 3rd bit from the top indiciates VHT Extended NSS BW
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* Capability.
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*/
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struct ieee80211_vht_mcs_info {
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__le16 rx_mcs_map;
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@ -1475,6 +1478,13 @@ struct ieee80211_vht_mcs_info {
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__le16 tx_highest;
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} __packed;
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/* for rx_highest */
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#define IEEE80211_VHT_MAX_NSTS_TOTAL_SHIFT 13
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#define IEEE80211_VHT_MAX_NSTS_TOTAL_MASK (7 << IEEE80211_VHT_MAX_NSTS_TOTAL_SHIFT)
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/* for tx_highest */
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#define IEEE80211_VHT_EXT_NSS_BW_CAPABLE (1 << 13)
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/**
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* enum ieee80211_vht_mcs_support - VHT MCS support definitions
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* @IEEE80211_VHT_MCS_SUPPORT_0_7: MCSes 0-7 are supported for the
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@ -1650,6 +1660,7 @@ struct ieee80211_mu_edca_param_set {
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#define IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ 0x00000004
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#define IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ 0x00000008
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#define IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK 0x0000000C
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#define IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_SHIFT 2
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#define IEEE80211_VHT_CAP_RXLDPC 0x00000010
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#define IEEE80211_VHT_CAP_SHORT_GI_80 0x00000020
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#define IEEE80211_VHT_CAP_SHORT_GI_160 0x00000040
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@ -1678,6 +1689,26 @@ struct ieee80211_mu_edca_param_set {
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#define IEEE80211_VHT_CAP_VHT_LINK_ADAPTATION_VHT_MRQ_MFB 0x0c000000
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#define IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN 0x10000000
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#define IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN 0x20000000
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#define IEEE80211_VHT_CAP_EXT_NSS_BW_SHIFT 30
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#define IEEE80211_VHT_CAP_EXT_NSS_BW_MASK 0xc0000000
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/**
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* ieee80211_get_vht_max_nss - return max NSS for a given bandwidth/MCS
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* @cap: VHT capabilities of the peer
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* @bw: bandwidth to use
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* @mcs: MCS index to use
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* @ext_nss_bw_capable: indicates whether or not the local transmitter
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* (rate scaling algorithm) can deal with the new logic
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* (dot11VHTExtendedNSSBWCapable)
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*
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* Due to the VHT Extended NSS Bandwidth Support, the maximum NSS can
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* vary for a given BW/MCS. This function parses the data.
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*
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* Note: This function is exported by cfg80211.
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*/
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int ieee80211_get_vht_max_nss(struct ieee80211_vht_cap *cap,
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enum ieee80211_vht_chanwidth bw,
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int mcs, bool ext_nss_bw_capable);
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/* 802.11ax HE MAC capabilities */
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#define IEEE80211_HE_MAC_CAP0_HTC_HE 0x01
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@ -5,17 +5,20 @@
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* Copyright 2007-2009 Johannes Berg <johannes@sipsolutions.net>
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* Copyright 2013-2014 Intel Mobile Communications GmbH
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* Copyright 2017 Intel Deutschland GmbH
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* Copyright (C) 2018 Intel Corporation
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*/
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#include <linux/export.h>
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#include <linux/bitops.h>
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#include <linux/etherdevice.h>
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#include <linux/slab.h>
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#include <linux/ieee80211.h>
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#include <net/cfg80211.h>
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#include <net/ip.h>
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#include <net/dsfield.h>
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#include <linux/if_vlan.h>
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#include <linux/mpls.h>
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#include <linux/gcd.h>
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#include <linux/bitfield.h>
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#include "core.h"
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#include "rdev-ops.h"
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@ -1938,3 +1941,109 @@ void cfg80211_send_layer2_update(struct net_device *dev, const u8 *addr)
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netif_rx_ni(skb);
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}
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EXPORT_SYMBOL(cfg80211_send_layer2_update);
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int ieee80211_get_vht_max_nss(struct ieee80211_vht_cap *cap,
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enum ieee80211_vht_chanwidth bw,
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int mcs, bool ext_nss_bw_capable)
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{
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u16 map = le16_to_cpu(cap->supp_mcs.rx_mcs_map);
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int max_vht_nss = 0;
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int ext_nss_bw;
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int supp_width;
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int i, mcs_encoding;
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if (map == 0xffff)
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return 0;
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if (WARN_ON(mcs > 9))
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return 0;
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if (mcs <= 7)
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mcs_encoding = 0;
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else if (mcs == 8)
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mcs_encoding = 1;
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else
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mcs_encoding = 2;
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/* find max_vht_nss for the given MCS */
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for (i = 7; i >= 0; i--) {
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int supp = (map >> (2 * i)) & 3;
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if (supp == 3)
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continue;
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if (supp >= mcs_encoding) {
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max_vht_nss = i;
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break;
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}
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}
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if (!(cap->supp_mcs.tx_mcs_map &
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cpu_to_le16(IEEE80211_VHT_EXT_NSS_BW_CAPABLE)))
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return max_vht_nss;
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ext_nss_bw = le32_get_bits(cap->vht_cap_info,
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IEEE80211_VHT_CAP_EXT_NSS_BW_MASK);
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supp_width = le32_get_bits(cap->vht_cap_info,
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IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK);
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/* if not capable, treat ext_nss_bw as 0 */
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if (!ext_nss_bw_capable)
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ext_nss_bw = 0;
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/* This is invalid */
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if (supp_width == 3)
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return 0;
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/* This is an invalid combination so pretend nothing is supported */
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if (supp_width == 2 && (ext_nss_bw == 1 || ext_nss_bw == 2))
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return 0;
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/*
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* Cover all the special cases according to IEEE 802.11-2016
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* Table 9-250. All other cases are either factor of 1 or not
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* valid/supported.
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*/
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switch (bw) {
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case IEEE80211_VHT_CHANWIDTH_USE_HT:
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case IEEE80211_VHT_CHANWIDTH_80MHZ:
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if ((supp_width == 1 || supp_width == 2) &&
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ext_nss_bw == 3)
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return 2 * max_vht_nss;
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break;
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case IEEE80211_VHT_CHANWIDTH_160MHZ:
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if (supp_width == 0 &&
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(ext_nss_bw == 1 || ext_nss_bw == 2))
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return DIV_ROUND_UP(max_vht_nss, 2);
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if (supp_width == 0 &&
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ext_nss_bw == 3)
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return DIV_ROUND_UP(3 * max_vht_nss, 4);
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if (supp_width == 1 &&
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ext_nss_bw == 3)
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return 2 * max_vht_nss;
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break;
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case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
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if (supp_width == 0 &&
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(ext_nss_bw == 1 || ext_nss_bw == 2))
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return 0; /* not possible */
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if (supp_width == 0 &&
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ext_nss_bw == 2)
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return DIV_ROUND_UP(max_vht_nss, 2);
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if (supp_width == 0 &&
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ext_nss_bw == 3)
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return DIV_ROUND_UP(3 * max_vht_nss, 4);
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if (supp_width == 1 &&
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ext_nss_bw == 0)
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return 0; /* not possible */
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if (supp_width == 1 &&
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ext_nss_bw == 1)
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return DIV_ROUND_UP(max_vht_nss, 2);
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if (supp_width == 1 &&
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ext_nss_bw == 2)
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return DIV_ROUND_UP(3 * max_vht_nss, 4);
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break;
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}
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/* not covered or invalid combination received */
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return max_vht_nss;
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}
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EXPORT_SYMBOL(ieee80211_get_vht_max_nss);
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