feat: Adds option to use different datapath

[gruyaume]

Description

OVS can operate entirely in user space, provided the datapath_type parameter when creating bridge. This PR adds support for the netdev datapath.

Usage

package main

import (
	"log"

	"github.com/digitalocean/go-openvswitch/ovs"
)

func main() {
	var ovsBridge string = "br0"

	ovsClient := ovs.New(
		ovs.Sudo(),
	)

	// sudo ovs-vsctl add-br br0
	if err := ovsClient.VSwitch.AddBridge(ovsBridge); err != nil {
		log.Fatalf("failed to add bridge: %v", err)
	}

	// sudo ovs-vsctl set bridge br0 datapath_type=netdev
	if err := ovsClient.VSwitch.Set.Bridge(ovsBridge, ovs.BridgeOptions{
		DataPathType: ovs.DataPathTypeNetDev,
	}); err != nil {
		log.Fatalf("failed to set bridge: %v", err)
	}

}

Reference

• https://docs.openvswitch.org/en/latest/intro/install/userspace/