NanoPi R4S-RK3399 is a great new OpenWrt device

leandrolnh · December 27, 2024, 3:02pm

I've found out that if I configure rps_cpus manually, i.e
echo f > /sys/class/net/eth0/queues/rx-0/rps_cpus
after sometime it resets to 0.

Since I have packet steering disabled, probably it's related to this:

github.com

openwrt/openwrt/blob/fe17cc1bfd132c7dd2486952ec75dbb260abde44/package/network/config/netifd/files/usr/libexec/network/packet-steering.uc#L72


      
          		mask = (1 << length(cpus)) - 1;
          	else
          		mask = (1 << int(cpu));
          	return sprintf("%x", mask);
          }
          
          function set_netdev_cpu(dev, cpu) {
          	let queues = glob(`/sys/class/net/${dev}/queues/rx-*/rps_cpus`);
          	let val = cpu_mask(cpu);
          	if (disable)
          		val = 0;
          	for (let queue in queues) {
          		if (debug || do_nothing)
          			warn(`echo ${val} > ${queue}\n`);
          		if (!do_nothing)
          			writefile(queue, `${val}`);
          	}
          	queues = glob(`/sys/class/net/${dev}/queues/rx-*/rps_flow_cnt`);
          	for (let queue in queues) {
          		if (debug || do_nothing)
          			warn(`echo ${local_flows} > ${queue}\n`);

The suggested solution of creating a script in /etc/hotplug.d/net also gets the config reset.

I think the solution is creating the file /usr/libexec/platform/packet-steering.sh, at least according to this:

github.com

openwrt/openwrt/blob/fe17cc1bfd132c7dd2486952ec75dbb260abde44/package/network/config/netifd/files/etc/init.d/packet_steering#L20


      
          service_triggers() {
          	procd_add_reload_trigger "network"
          	procd_add_reload_trigger "firewall"
          	procd_add_raw_trigger "interface.*" 1000 /etc/init.d/packet_steering reload
          }
          
          reload_service() {
          	packet_steering="$(uci -q get "network.@globals[0].packet_steering")"
          	steering_flows="$(uci -q get "network.@globals[0].steering_flows")"
          	[ "${steering_flows:-0}" -gt 0 ] && opts="-l $steering_flows"
          	if [ -e "/usr/libexec/platform/packet-steering.sh" ]; then
          		/usr/libexec/platform/packet-steering.sh "$packet_steering"
          	else
          		/usr/libexec/network/packet-steering.uc $opts "$packet_steering"
          	fi
          }