Re: [Qemu-devel] Simulate different network card vendors

[rajan pathak <rajanpatha34@gmail.com>]

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Thanks Stefan for your kind response.

I am OK with C programming and wrote couple of LKM related to FPGA device.

But my understanding of QEMU is very limited.

Let me ask some specific question on what I wanted to do.

I am looking forward to emulate single-chip Ethernet controller.

I can find some of its source code online and it has two main part Ethernet
PHY (any 1GB SGMII compatible)
and Ethernet MAC .

So ,DO I need to simply put the corresponding source files of PHY and MAC
in hw/net directory of QEMU?

Also ,do I need to take care of underlying Ethernet controller(of my
machine where I am trying to do this) from
Broadcom in any way?

Thanks
Rajan





On Wed, Jan 15, 2014 at 10:29 PM, Stefan Hajnoczi <stefanha@gmail.com>wrote:

> On Wed, Jan 15, 2014 at 01:27:41PM +0530, rajan pathak wrote:
> > I am new QEMU development and wanted to Simulate Atheros Network
> controller.
> >
> >
> > I am Running QEMU on x86 machine with underlaying network controller from
> > Broadcom and
> >  compiled linux kernel based on ARM having Atheros driver support.
> >
> > I guess there must be mapping at QEMU level calls for Atheros driver maps
> > to Broadcom.
> > Have no idea where to start looking in to QEMU code and what files to
> look
> > into.
> >
> > Can anyone let me know how in general mapping mapping between two
> different
> > network vendors takes plave at QEMU level.
>
> QEMU emulates hardware (network cards, graphics cards, sound cards,
> etc).  What you are asking about is adding a new emulated device for an
> Atheros NIC.
>
> Usually that involves reviewing the datasheet from the hardware vendor
> to understand the programming interface that the hardware provides (e.g.
> hardware registers accessible over PCI).
>
> In some cases no datasheet is available so you have to look at existing
> open source drivers to understand how the device is supposed to behave.
>
> Then you can implement the device in QEMU.  See the hw/net/ directory.
>
> If you're not already familiar with device drivers/device emulation and
> C programming then this can be a big undertaking.  The main requirement
> is to understand how the hardware is supposed to behave, it can be very
> difficult if the vendor does not provide a datasheet.
>
> Perhaps you can modify your guest to use one of the NICs that QEMU
> already has support for (rtl8139, e1000, virtio-net, etc)?
>
> Stefan
>

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