linux-atm: add br2684ctl option to specify the netdev name

Add the uci option nameprefix to specifc a target netdev name. Patch the
br2684ctl code to accept and set a netdev name via commandline parameters.

It allows to use the same netdev name for ATM and PTM lines on lantiq
xdsl hardware.

Signed-off-by: Martin Schiller <ms@dev.tdt.de>
Signed-off-by: Mathis Kresin <dev@kresin.me>

package/network/utils/linux-atm/files/br2684ctl

@@ -13,6 +13,9 @@ start_daemon() {
 
 	config_get atmdev "$cfg" atmdev 0
 
+	local nameprefix
+	config_get nameprefix "$cfg" nameprefix "nas"
+
 	local unit
 	config_get unit "$cfg" unit 0
 
@@ -58,8 +61,8 @@ start_daemon() {
 
 	procd_open_instance
 	procd_set_param command \
-		/usr/sbin/br2684ctl_wrap "nas$unit" \
-		-c "$unit" -e "$encaps" -p "$payload" \
+		/usr/sbin/br2684ctl_wrap "${nameprefix}${unit}" \
+		-n "$nameprefix" -c "$unit" -e "$encaps" -p "$payload" \
 		-a "$circuit" ${qos:+-q "$qos"} ${sendsize:+-s "$sendsize"} \
 		-S /lib/netifd/br2684-up
 	procd_close_instance