[openwrt/openwrt] mac80211: make use of the new 'band' option

[LEDE Commits]

nbd pushed a commit to openwrt/openwrt.git, branch openwrt-21.02:
https://git.openwrt.org/d0b33833aed0226a7fba679699ccae0f8af197a4

commit d0b33833aed0226a7fba679699ccae0f8af197a4
Author: Felix Fietkau <nbd at nbd.name>
AuthorDate: Mon May 24 14:55:01 2021 +0200

    mac80211: make use of the new 'band' option
    
    Use it to look up frequencies only in the configured band to better deal
    with channel number overlap
    
    Signed-off-by: Felix Fietkau <nbd at nbd.name>
    (cherry-picked from commit 8b8c1cb09bf2259e647a15d0c881b5dea15330da)
---
 .../mac80211/files/lib/netifd/wireless/mac80211.sh | 45 +++++++++++++++-------
 1 file changed, 31 insertions(+), 14 deletions(-)

diff --git a/package/kernel/mac80211/files/lib/netifd/wireless/mac80211.sh b/package/kernel/mac80211/files/lib/netifd/wireless/mac80211.sh
index 9a9c35fb5f..cd442ce928 100644
--- a/package/kernel/mac80211/files/lib/netifd/wireless/mac80211.sh
+++ b/package/kernel/mac80211/files/lib/netifd/wireless/mac80211.sh
@@ -26,7 +26,6 @@ drv_mac80211_init_device_config() {
 	hostapd_common_add_device_config
 
 	config_add_string path phy 'macaddr:macaddr'
-	config_add_string hwmode
 	config_add_string tx_burst
 	config_add_string distance
 	config_add_int beacon_int chanbw frag rts
@@ -689,14 +688,8 @@ mac80211_prepare_iw_htmode() {
 	case "$htmode" in
 		VHT20|HT20) iw_htmode=HT20;;
 		HT40*|VHT40|VHT160)
-			case "$hwmode" in
-				a)
-					case "$(( ($channel / 4) % 2 ))" in
-						1) iw_htmode="HT40+" ;;
-						0) iw_htmode="HT40-";;
-					esac
-				;;
-				*)
+			case "$band" in
+				2g)
 					case "$htmode" in
 						HT40+) iw_htmode="HT40+";;
 						HT40-) iw_htmode="HT40-";;
@@ -709,6 +702,12 @@ mac80211_prepare_iw_htmode() {
 						;;
 					esac
 				;;
+				*)
+					case "$(( ($channel / 4) % 2 ))" in
+						1) iw_htmode="HT40+" ;;
+						0) iw_htmode="HT40-";;
+					esac
+				;;
 			esac
 			[ "$auto_channel" -gt 0 ] && iw_htmode="HT40+"
 		;;
@@ -818,7 +817,6 @@ mac80211_setup_vif() {
 		mesh)
 			wireless_vif_parse_encryption
 			[ -z "$htmode" ] && htmode="NOHT";
-			freq="$(get_freq "$phy" "$channel")"
 			if [ "$wpa" -gt 0 -o "$auto_channel" -gt 0 ] || chan_is_dfs "$phy" "$channel"; then
 				mac80211_setup_supplicant $vif_enable || failed=1
 			else
@@ -832,7 +830,6 @@ mac80211_setup_vif() {
 		adhoc)
 			wireless_vif_parse_encryption
 			if [ "$wpa" -gt 0 -o "$auto_channel" -gt 0 ]; then
-				freq="$(get_freq "$phy" "$channel")"
 				mac80211_setup_supplicant_noctl $vif_enable || failed=1
 			else
 				mac80211_setup_adhoc $vif_enable
@@ -849,9 +846,29 @@ mac80211_setup_vif() {
 
 get_freq() {
 	local phy="$1"
-	local chan="$2"
-	iw "$phy" info | grep -E -m1 "(\* ${chan:-....} MHz${chan:+|\\[$chan\\]})" | grep MHz | awk '{print $2}'
+	local channel="$2"
+	local band="$3"
+
+	case "$band" in
+		2g) band="1:";;
+		5g) band="2:";;
+		60g) band="3:";;
+		6g) band="4:";;
+	esac
+
+	iw "$phy" info | awk -v band="$band" -v channel="[$channel]" '
+
+$1 ~ /Band/ {
+	band_match = band == $2
+}
+
+band_match && $3 == "MHz" && $4 == channel {
+	print $2
+	exit
 }
+'
+}
+
 
 chan_is_dfs() {
 	local phy="$1"
@@ -933,7 +950,7 @@ drv_mac80211_setup() {
 	done
 
 	# convert channel to frequency
-	[ "$auto_channel" -gt 0 ] || freq="$(get_freq "$phy" "$channel")"
+	[ "$auto_channel" -gt 0 ] || freq="$(get_freq "$phy" "$channel" "$band")"
 
 	[ -n "$country" ] && {
 		iw reg get | grep -q "^country $country:" || {