[ovs-dev] How ovs dpdk tunnel works

[Na Zhu]

Hi Jesse,

Thanks your reply.
Is the user space vxlan module copy from the linux kernel vxlan module?
The tunnel usage is the same to me if I upgrade ovs 2.3 to ovs 2.4, right?


2015-09-10 1:56 GMT+08:00 Jesse Gross <jesse at nicira.com>:

> On Wed, Sep 9, 2015 at 4:20 AM, Na Zhu <zhunatuzi at gmail.com> wrote:
> > Hi,
> >
> > The OVS 2.4 claims it supports DPDK tunneling, I am confused about how it
> > support, because native OVS vxlan depends on linux kernel vxlan module,
> but
> > OVS dpdk runs on user space, does OVS 2.4 include a user space vxlan
> module?
>
> Yes.
>
> > I read the file README-native-tunneling.md, i find a different configure
> > from native OVS, it is add route to ovs route table, i did not know ovs
> has
> > route table, can anyone explain what is the relationship between route
> > table and tunnel?
>
> Tunnels need to send packets over an IP stack associated with the
> endpoint and the IP stack needs a routing table to know where to send
> packets. With kernel based tunnels, it is the Linux routing table that
> is use but an equivalent is needed when DPDK is used instead. In
> general, this can be synced automatically from the kernel table and
> nothing needs to be configured by hand.
>