Give each stream its own ethertype steered to its own rx queue

sock.go

@@ -56,7 +56,7 @@ func openTxSocket(ifindex int) (int, error) {
 	return fd, nil
 }
 
-func openRxSocket(ifindex, fanoutID, fanoutMode int) (int, error) {
+func openRxSocket(ifindex int, etherType uint16) (int, error) {
 	proto := int(htons(etherType))
 	fd, err := unix.Socket(unix.AF_PACKET, unix.SOCK_RAW, proto)
 	if err != nil {
@@ -82,13 +82,6 @@ func openRxSocket(ifindex, fanoutID, fanoutMode int) (int, error) {
 		unix.Close(fd)
 		return -1, fmt.Errorf("rcvtimeo: %w", err)
 	}
-	if fanoutMode >= 0 {
-		arg := (fanoutMode << 16) | (fanoutID & 0xffff)
-		if err := unix.SetsockoptInt(fd, unix.SOL_PACKET, unix.PACKET_FANOUT, arg); err != nil {
-			unix.Close(fd)
-			return -1, fmt.Errorf("fanout: %w", err)
-		}
-	}
 	return fd, nil
 }