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Control Your Network ASICs, What Benefits Switchdev
Can Bring Us
Hung-Wei Chiu(hwchiu)
Who Am I
• Hung-Wei Chiu (hwchiu)
• DevOps Engineer at ThunderToken
• Co-Organizer of SDNDS-TW/CNTUG
• Fields
– Linux Networks
– SDN
– Container/Kubernetes
Outline
• Why We Need the Switchdev
• How Switchdev Works
• Example Cases
What’s the
Problem ?
From the SDN
• SDN definition (From ONF)
– DIRECTLY PROGRAMMABLE
– AGILE
– CENTRALLY MANAGED
– PROGRAMMATICALLY CONFIGURED
– OPEN STANDARDS-BASED AND VENDOR-
NEUTRAL
Beyond The OF/P4
• But there are still many networking
devices can’t be controlled by general
methods.
• General methods
– Linux Commands
– Not Propitiatory tools
Example
Home Router
• Did you open a ssh connection into the
home router before?
• There’re five physical ports but can see
two ports in your Linux command
Home Router
• 5 ports (wan +
lan)
• Only two ports
in the linux
system.
https://www.smallnetbuilder.com/wireless/wireless-reviews
Why
• Usually, there’re a embedded switch
connecting all physical(Lan) ports
• Only report one port to kernel
• That switch supports the hardware offload
for those lan ports
– By MAC address.
Example
WAN LAN 1 LAN 2 LAN 3 LAN 4
Without CPUWith Main CPU
Hardware Board
What’s The Problem
• We can’t use the common Linux tools to
operate with all physical ports.
– ip/route/ifconfig/tc/
• But, if we use a binary-blob provided by
the chip vendor, we can control those
magic part now.
What We Want
Can we use the common tools to control
those ports ?
What We Want
That’s what switchdev want to solve
How It Solves
Introduction
• High-end networking hardware
– Linux capable
– Reality, has its functionality implemented only
in a proprietary blob.
• Switchdev
– Replace those proprietary blocks with standard
kernel interface.
Introduction
• Originates in OpenvSwitch from 2014.
• A general solution for hardware switch
chips
– We use the netdev in the linux kernel for
network interface card.
• Make a concerted effort to break the
vendor’s lock-in.
Overview
user space
kernel space
kernel space
hardware
Switch Driver
Linux Network Stack
Switch Device (sw1)
Offload data path
ip route tc apps
p1 p2 p3 p4 p5 p6
Hardware Bus
sw1p1
sw1p2
sw1p3
sw1p4
sw1p5
sw1p6
netlink
Features
• Port topology
– Bonding
– Bridge
• Port status
– PHY link state
– I/O statistics
Features
• L2 forwarding offload
– FDB
– STP
– Vlan
• L3 routing offload
– FIB
– Multicast
Significant
Does anybody accept switchdev ?
Vendors
• Vendor should implement its driver based
on the switchdev and contribute to linux
kernel upstream.
• Mellanox
– July 2015
• Broadcom
– Feb 2015
Verizon
• Network Architecture team
• The division runs several data centers in
the United States
• Problems
– user-space network-configuration tools
provided by most switch vendors,
Verizon
Several dozen switches that each require a
separate CLI application for management becomes
a support nightmare
Verizon
• The proprietary CLI tools do not make it
easy to automate operations
– NetDevOps
• The switch vendors are typically reluctant
to make programmatic interfaces to their
tools
Cases
SRIOV
• Single-root I/O virtualization
• Legacy mode
• Switchdev mode
– Implemented by different vendor
Legacy Mode
VM1 VM2 VM3
SR-IOV Embedded Switch
VF VF
VF Driver VF Driver VNIC
VM4
VNIC
Software Switch
NIC
Linux Host
Switchdev Mode
VM1 VM2 VM3
SR-IOV Embedded Switch
VF VF
VF Driver VF Driver VNIC
VM4
VNIC
Software Switch
NIC
Linux Host
VF
Representor
VF
Representor
Summary
Reference: http://www.mellanox.com/page/products_dyn?product_family=262&mtag=Spectrum%20Linux%20Switch
Control Your Network ASICs, What Benefits switchdev Can Bring Us

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