Multi Channel DMA Intel® FPGA IP for PCI Express Design Example User Guide

ID 683517
Date 4/29/2022

A newer version of this document is available. Customers should click here to go to the newest version.

Document Table of Contents
Give Feedback Transmit Packet Steering (XPS)

Transmit Packet Steering is a mechanism for selecting which transmit queue to use when transmitting a packet on a multi-queue device.

When using XPS, you can map multiple cores to a queue.


  • Disable IFC_SELECT_QUEUE_ALGO flag in driver/kmod/mcdma-netdev-driver/Makefile.
  • Map Tx queues to cores:
    echo cpu_mask > /sys/class/net/ifc_mcdma0/queues/tx-i
    cat /sys/class/net/ifc_mcdma0/queues/tx-i
    Map core 0, 1, and 2 to transmit queue 5.
    echo 7 > /sys/class/net/ifc_mcdma0/queues/tx-5