From 4d323303e7e5743f541e3b41dfb2ac1627e8d96d Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@nbd.name>
Date: Fri, 30 Sep 2022 20:14:05 +0200
Subject: [PATCH] mac80211: rename phy according to board.json entries on
 bringup

This allows phy names specified in board.json to be used directly instead of
the path option

Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
 .../files/lib/netifd/wireless/mac80211.sh     | 68 ++++++++++++++++++-
 1 file changed, 65 insertions(+), 3 deletions(-)

diff --git a/package/kernel/mac80211/files/lib/netifd/wireless/mac80211.sh b/package/kernel/mac80211/files/lib/netifd/wireless/mac80211.sh
index e05a5b8fee..ed2805213e 100644
--- a/package/kernel/mac80211/files/lib/netifd/wireless/mac80211.sh
+++ b/package/kernel/mac80211/files/lib/netifd/wireless/mac80211.sh
@@ -581,15 +581,77 @@ mac80211_generate_mac() {
 		$(( (0x$6 + $id) % 0x100 ))
 }
 
+get_board_phy_name() (
+	local path="$1"
+	local fallback_phy=""
+
+	__check_phy() {
+		local val="$1"
+		local key="$2"
+		local ref_path="$3"
+
+		json_select "$key"
+		json_get_values path
+		json_select ..
+
+		[ "${ref_path%+*}" = "$path" ] && fallback_phy=$key
+		[ "$ref_path" = "$path" ] || return 0
+
+		echo "$key"
+		exit
+	}
+
+	json_load_file /etc/board.json
+	json_for_each_item __check_phy wlan "$path"
+	[ -n "$fallback_phy" ] && echo "${fallback_phy}.${path##*+}"
+)
+
+rename_board_phy_by_path() {
+	local path="$1"
+
+	local new_phy="$(get_board_phy_name "$path")"
+	[ -z "$new_phy" -o "$new_phy" = "$phy" ] && return
+
+	iw "$phy" set name "$new_phy" && phy="$new_phy"
+}
+
+rename_board_phy_by_name() (
+	local phy="$1"
+	local suffix="${phy##*.}"
+	[ "$suffix" = "$phy" ] && suffix=
+
+	json_load_file /etc/board.json
+	json_select wlan
+	json_select "${phy%.*}" || return 0
+	json_get_values path
+
+	prev_phy="$(iwinfo nl80211 phyname "path=$path${suffix:++$suffix}")"
+	[ -n "$prev_phy" ] || return 0
+
+	[ "$prev_phy" = "$phy" ] && return 0
+
+	iw "$prev_phy" set name "$phy"
+)
+
 find_phy() {
-	[ -n "$phy" -a -d /sys/class/ieee80211/$phy ] && return 0
+	[ -n "$phy" ] && {
+		rename_board_phy_by_name "$phy"
+		[ -d /sys/class/ieee80211/$phy ] && return 0
+	}
 	[ -n "$path" ] && {
 		phy="$(iwinfo nl80211 phyname "path=$path")"
-		[ -n "$phy" ] && return 0
+		[ -n "$phy" ] && {
+			rename_board_phy_by_path "$path"
+			return 0
+		}
 	}
 	[ -n "$macaddr" ] && {
 		for phy in $(ls /sys/class/ieee80211 2>/dev/null); do
-			grep -i -q "$macaddr" "/sys/class/ieee80211/${phy}/macaddress" && return 0
+			grep -i -q "$macaddr" "/sys/class/ieee80211/${phy}/macaddress" && {
+				path="$(iwinfo nl80211 path "$phy")"
+				rename_board_phy_by_path "$path"
+				return 0
+			}
 		done
 	}
 	return 1
-- 
2.30.2