+static portid_t
+fwd_topology_tx_port_get(portid_t rxp)
+{
+ static int warning_once = 1;
+
+ RTE_ASSERT(rxp < cur_fwd_config.nb_fwd_ports);
+
+ switch (port_topology) {
+ default:
+ case PORT_TOPOLOGY_PAIRED:
+ if ((rxp & 0x1) == 0) {
+ if (rxp + 1 < cur_fwd_config.nb_fwd_ports)
+ return rxp + 1;
+ if (warning_once) {
+ printf("\nWarning! port-topology=paired"
+ " and odd forward ports number,"
+ " the last port will pair with"
+ " itself.\n\n");
+ warning_once = 0;
+ }
+ return rxp;
+ }
+ return rxp - 1;
+ case PORT_TOPOLOGY_CHAINED:
+ return (rxp + 1) % cur_fwd_config.nb_fwd_ports;
+ case PORT_TOPOLOGY_LOOP:
+ return rxp;
+ }
+}
+