Re: [Qemu-devel] Virtio-net cli parameters

[Pradeep Kiruvale]

Hi Stefan,

Thanks for the reply.

On 30 September 2016 at 15:49, Stefan Hajnoczi <address@hidden> wrote:

> On Thu, Sep 29, 2016 at 04:11:27PM +0200, Pradeep Kiruvale wrote:
> > Hi Stefan,
> >
> > On 28 September 2016 at 10:29, Stefan Hajnoczi <address@hidden>
> wrote:
> >
> > > On Mon, Sep 26, 2016 at 05:41:55PM +0200, Pradeep Kiruvale wrote:
> > > > I want to add couple of new cli options for the virtio-net driver
> and use
> > > > them inside the
> > > > virtio-net driver to throttle the packets. I did go through the code
> and
> > > > did single stepping
> > > > using the gdb, but still could not find the place where the
> virtio-net
> > > > parameters are getting
> > > > parsed and populated into the virtio-net structures.
> > > > Could some one please guide/suggest where to look into, in qemu code
> > > base?
> > >
> > > Take a look at virtio_net_properties[] in hw/net/virtio-net.c.
> > >
> >
> > These variables/properties are static variables. What I am looking about
> is
> > how can I pass a cli option from qemu into virtio-net driver.
>
> When you say "virtio-net driver" I think you mean the virtio-net
> device emulation code in QEMU?
>
Yes, which the virtio-net driver uses to do the network I/O.

>
> These *are* the properties that can be set from the QEMU command-line.
> For example:
>
>   -device virtio-net-pci,csum=off
>
This is the clue, I was looking for. I will see how to proceed from here
on.

>
> The command-line -device option creates device objects using
> qdev_device_add() and then loops over the command-line parameters
> calling set_property() on them.
>
> Hope this helps you understand the code.
>
Thanks, it will really help me to proceed with my work.

Regards,
Pradeep

>
> Stefan
>