DPDK KNI interface
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The document provides an overview of the DPDK KNI interface, focusing on high-level architecture, data reception and transmission paths in both user space and kernel space, and the associated DPDK libraries. It discusses the use of FIFO structures, threading, and sample applications demonstrating loopback and standard modes. Additionally, it references resources like the DPDK programmer’s guide and getting started guide for development.
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DPDK KNI interface
- 1. DPDK KNI interface Quick overview
- 2. High Level Architecture User space Kernel space NIC App DPDK Ring buffers KNI driver RX/TX queues TCP/IP stack
- 3. Kernel space Data RX path design TCP/IP stack User space App DPDK lib FIFO Thread Thread N
- 4. Data RX path implementation Kernel space netif_rx(skb) TCP/IP stack kni_fifo_put() Kernel module FIFO DPDK libSocket kni_net_rx kni_fifo_get dev_alloc_skb rte_kni_tx_burst()
- 5. Kernel space Data TX path TCP/IP stack User space App DPDK lib FIFO
- 6. Data TX path implementation Kernel space kni_net_tx() TCP/IP stack kni_fifo_get() Kernel module memcpy (FIFO, SKB) kni_fifo_put dev_kfree_skb FIFO DPDK libSocket rte_kni_rx_burst()
- 7. Kernel space Sample application in a loopback mode User space FIFO 2 NIC port1 port2 Core2Core1 FIFO 1 Thread
- 8. Sample application in a standard mode Kernel space User space FIFO 2 NIC port1 port2 Core2Core1 FIFO 1 vEth1vEth0 Thread ipstack
- 9. References Building the Development Kit Binary DPDK Programmer’s Guide - Kernel NIC Interface Kernel NIC Interface Sample Application Getting Started Guide for Linux DPDK quick start Huge pages
- 10. My blog Learning Network Programming