wifi: Introduce 802.11ac support

This patch introduces 802.11ac support to mac80211 and hostapd. The split of
VHT160 in two 80 MHz bands is not yet supported, since it requires an
additional user supplied parameter for the channel of the second band.

Signed-off-by: Matti Laakso <malaakso@elisanet.fi>
Signed-off-by: Simon Wunderlich <simon@open-mesh.com>
[sven@open-mesh.com: Rebased patch, merged htmode and vhtmode,
removed special hwmode, replaced uci vht_capab list with overwritable
autoconfig, fixed hostapd integration, fixed commit description, add HT40+/-
for VHT modes, add VHT40 center_freq autoconfig, refactored major parts]
Signed-off-by: Sven Eckelmann <sven@open-mesh.com>

SVN-Revision: 39456

package/kernel/mac80211/files/lib/netifd/wireless/mac80211.sh

@@ -23,6 +23,20 @@ drv_mac80211_init_device_config() {
 	config_add_int rxantenna txantenna antenna_gain txpower distance
 	config_add_boolean noscan
 	config_add_array ht_capab
+	config_add_boolean \
+		rxldpc \
+		short_gi_80 \
+		short_gi_160 \
+		tx_stbc_2by1 \
+		su_beamformer \
+		su_beamformee \
+		mu_beamformer \
+		mu_beamformee \
+		vht_txop_ps \
+		htc_vht \
+		rx_antenna_pattern \
+		tx_antenna_pattern
+	config_add_int vht_max_mpdu vht_max_rx_stbc vht_link_adapt vht160
 }
 
 drv_mac80211_init_iface_config() {
@@ -55,12 +69,164 @@ mac80211_hostapd_setup_base() {
 		append base_cfg "ieee80211n=1" "$N"
 
 		ht_capab=
-		[ -n "$htmode" ] && ht_capab="[$htmode]"
+		case "$htmode" in
+			HT20|HT40-|HT40+) ht_capab="[$htmode]";;
+			VHT40|VHT80|VHT160)
+				case "$channel" in
+					36|44|52|60|100|108|116|124|132|140|149|157) ht_capab="[HT40+]";;
+					40|48|56|64|104|112|120|128|136|144|153|161) ht_capab="[HT40-]";;
+				esac
+				;;
+		esac
 		for cap in $ht_capab_list; do
 			ht_capab="$ht_capab[$cap]"
 		done
 
 		[ -n "$ht_capab" ] && append base_cfg "ht_capab=$ht_capab" "$N"
+
+		# 802.11ac
+		enable_ac=0
+		idx="$channel"
+		case "$htmode" in
+			VHT40)
+				case "$channel" in
+					36|40) idx=38;;
+					44|48) idx=42;;
+					52|56) idx=54;;
+					60|64) idx=58;;
+					100|104) idx=102;;
+					108|112) idx=110;;
+					116|120) idx=118;;
+					124|128) idx=126;;
+					132|136) idx=134;;
+					140|144) idx=142;;
+					149|153) idx=151;;
+					157|161) idx=159;;
+				esac
+				enable_ac=1
+				append base_cfg "vht_oper_chwidth=0" "$N"
+				append base_cfg "vht_oper_centr_freq_seg0_idx=$idx" "$N"
+			;;
+			VHT80)
+				case "$channel" in
+					36|40|44|48) idx=42;;
+					52|56|60|64) idx=58;;
+					100|104|108|112) idx=106;;
+					116|120|124|128) idx=122;;
+					132|136|140|144) idx=138;;
+					149|153|157|161) idx=155;;
+				esac
+				enable_ac=1
+				append base_cfg "vht_oper_chwidth=1" "$N"
+				append base_cfg "vht_oper_centr_freq_seg0_idx=$idx" "$N"
+			;;
+			VHT160)
+				case "$channel" in
+					36|40|44|48|52|56|60|64) idx=50;;
+					100|104|108|112|116|120|124|128) idx=114;;
+				esac
+				enable_ac=1
+				append base_cfg "vht_oper_chwidth=2" "$N"
+				append base_cfg "vht_oper_centr_freq_seg0_idx=$idx" "$N"
+			;;
+		esac
+
+		if [ "$enable_ac" != "0" ]; then
+			json_get_vars \
+				rxldpc:1 \
+				short_gi_80:1 \
+				short_gi_160:1 \
+				tx_stbc_2by1:1 \
+				su_beamformer:1 \
+				su_beamformee:1 \
+				mu_beamformer:1 \
+				mu_beamformee:1 \
+				vht_txop_ps:1 \
+				htc_vht:1 \
+				rx_antenna_pattern:1 \
+				tx_antenna_pattern:1 \
+				vht_max_mpdu:11454 \
+				vht_max_rx_stbc:4 \
+				vht_link_adapt:3 \
+				vht160:2
+
+			append base_cfg "ieee80211ac=1" "$N"
+			vht_capab=""
+			vht_cap=0
+			for cap in $(iw phy "$phy" info | awk -F "[()]" '/VHT Capabilities/ { print $2 }'); do
+				vht_cap="$(($vht_cap | $cap))"
+			done
+
+			# boolean
+			[ "$((($vht_cap & 16) * $rxldpc))" -eq 16 ] && \
+				vht_capab="$vht_capab[RXLDPC]"
+			[ "$((($vht_cap & 32) * $short_gi_80))" -eq 32 ] && \
+				vht_capab="$vht_capab[SHORT-GI-80]"
+			[ "$((($vht_cap & 64) * $short_gi_160))" -eq 64 ] && \
+				vht_capab="$vht_capab[SHORT-GI-160]"
+			[ "$((($vht_cap & 128) * $tx_stbc_2by1))" -eq 128 ] && \
+				vht_capab="$vht_capab[TX-STBC-2BY1]"
+			[ "$((($vht_cap & 2048) * $su_beamformer))" -eq 2048 ] && \
+				vht_capab="$vht_capab[SU-BEAMFORMER]"
+			[ "$((($vht_cap & 4096) * $su_beamformee))" -eq 4096 ] && \
+				vht_capab="$vht_capab[SU-BEAMFORMEE]"
+			[ "$((($vht_cap & 524288) * $mu_beamformer))" -eq 524288 ] && \
+				vht_capab="$vht_capab[MU-BEAMFORMER]"
+			[ "$((($vht_cap & 1048576) * $mu_beamformee))" -eq 1048576 ] && \
+				vht_capab="$vht_capab[MU-BEAMFORMEE]"
+			[ "$((($vht_cap & 2097152) * $vht_txop_ps))" -eq 2097152 ] && \
+				vht_capab="$vht_capab[VHT-TXOP-PS]"
+			[ "$((($vht_cap & 4194304) * $htc_vht))" -eq 4194304 ] && \
+				vht_capab="$vht_capab[HTC-VHT]"
+			[ "$((($vht_cap & 268435456) * $rx_antenna_pattern))" -eq 268435456 ] && \
+				vht_capab="$vht_capab[RX-ANTENNA-PATTERN]"
+			[ "$((($vht_cap & 536870912) * $tx_antenna_pattern))" -eq 536870912 ] && \
+				vht_capab="$vht_capab[TX-ANTENNA-PATTERN]"
+
+			# supported Channel widths
+			vht160_hw=0
+			[ "$(($vht_cap & 12))" -eq 4 -a 1 -le "$vht160" ] && \
+				vht160_hw=1
+			[ "$(($vht_cap & 12))" -eq 8 -a 2 -le "$vht160" ] && \
+				vht160_hw=2
+			[ "$vht160_hw" = 1 ] && vht_capab="$vht_capab[VHT160]"
+			[ "$vht160_hw" = 2 ] && vht_capab="$vht_capab[VHT160-80PLUS80]"
+
+			# maximum MPDU length
+			vht_max_mpdu_hw=3895
+			[ "$(($vht_cap & 3))" -ge 1 -a 7991 -le "$vht_max_mpdu" ] && \
+				vht_max_mpdu_hw=7991
+			[ "$(($vht_cap & 3))" -ge 2 -a 11454 -le "$vht_max_mpdu" ] && \
+				vht_max_mpdu_hw=11454
+			[ "$vht_max_mpdu_hw" != 3895 ] && \
+				vht_capab="$vht_capab[MAX-MPDU-$vht_max_mpdu_hw]"
+
+			# support for the reception of PPDUs using STBC
+			vht_max_rx_stbc_hw=0
+			[ "$(($vht_cap & 1792))" -ge 256 -a 1 -le "$vht_max_rx_stbc" ] && \
+				vht_max_rx_stbc_hw=1
+			[ "$(($vht_cap & 1792))" -ge 512 -a 2 -le "$vht_max_rx_stbc" ] && \
+				vht_max_rx_stbc_hw=2
+			[ "$(($vht_cap & 1792))" -ge 768 -a 3 -le "$vht_max_rx_stbc" ] && \
+				vht_max_rx_stbc_hw=3
+			[ "$(($vht_cap & 1792))" -ge 1024 -a 4 -le "$vht_max_rx_stbc" ] && \
+				vht_max_rx_stbc_hw=4
+			[ "$vht_max_rx_stbc_hw" = 1 ] && vht_capab="$vht_capab[RX-STBC-1]"
+			[ "$vht_max_rx_stbc_hw" = 2 ] && vht_capab="$vht_capab[RX-STBC-12]"
+			[ "$vht_max_rx_stbc_hw" = 3 ] && vht_capab="$vht_capab[RX-STBC-123]"
+			[ "$vht_max_rx_stbc_hw" = 4 ] && vht_capab="$vht_capab[RX-STBC-1234]"
+
+			# whether or not the STA supports link adaptation using VHT variant
+			vht_link_adapt_hw=0
+			[ "$(($vht_cap & 201326592))" -ge 134217728 -a 2 -le "$vht_link_adapt" ] && \
+				vht_link_adapt_hw=2
+			[ "$(($vht_cap & 201326592))" -ge 201326592 -a 3 -le "$vht_link_adapt" ] && \
+				vht_link_adapt_hw=3
+			[ "$vht_link_adapt_hw" != 0 ] && \
+				vht_capab="$vht_capab[VHT-LINK-ADAPT-$vht_link_adapt_hw]"
+
+			[ -n "$vht_capab" ] && append base_cfg "vht_capab=$vht_capab" "$N"
+		fi
 	}
 
 	hostapd_prepare_device_config "$hostapd_conf_file" nl80211

package/kernel/mac80211/files/lib/wifi/mac80211.sh

@@ -69,6 +69,8 @@ detect_mac80211() {
 		mode_11n=""
 		mode_band="g"
 		channel="11"
+		htmode=""
+
 		ht_cap=0
 		for cap in $(iw phy "$dev" info | grep 'Capabilities:' | cut -d: -f2); do
 			ht_cap="$(($ht_cap | $cap))"
@@ -76,7 +78,7 @@ detect_mac80211() {
 		ht_capab="";
 		[ "$ht_cap" -gt 0 ] && {
 			mode_11n="n"
-			append ht_capab "	option htmode	HT20" "$N"
+			htmode="HT20"
 
 			list="	list ht_capab"
 			[ "$(($ht_cap & 1))" -eq 1 ] && append ht_capab "$list	LDPC" "$N"
@@ -91,6 +93,15 @@ detect_mac80211() {
 		}
 		iw phy "$dev" info | grep -q '2412 MHz' || { mode_band="a"; channel="36"; }
 
+		vht_cap=$(iw phy "$dev" info | grep -c 'VHT Capabilities')
+		[ "$vht_cap" -gt 0 ] && {
+			mode_band="a";
+			channel="36"
+			htmode="VHT80"
+		}
+
+		[ -n $htmode ] && append ht_capab "	option htmode	$htmode" "$N"
+
 		if [ -x /usr/bin/readlink ]; then
 			path="$(readlink -f /sys/class/ieee80211/${dev}/device)"
 			path="${path##/sys/devices/}"

package/network/services/hostapd/files/hostapd-full.config

@@ -139,6 +139,9 @@ CONFIG_IEEE80211R=y
 # IEEE 802.11n (High Throughput) support
 CONFIG_IEEE80211N=y
 
+# IEEE 802.11ac (Very High Throughput) support
+CONFIG_IEEE80211AC=y
+
 # Remove debugging code that is printing out debug messages to stdout.
 # This can be used to reduce the size of the hostapd considerably if debugging
 # code is not needed.

package/network/services/hostapd/files/hostapd-mini.config

@@ -138,6 +138,9 @@ CONFIG_PEERKEY=y
 # IEEE 802.11n (High Throughput) support
 CONFIG_IEEE80211N=y
 
+# IEEE 802.11ac (Very High Throughput) support
+CONFIG_IEEE80211AC=y
+
 # Remove debugging code that is printing out debug messages to stdout.
 # This can be used to reduce the size of the hostapd considerably if debugging
 # code is not needed.