Re: Q on ioctl support in netfront/netback

[ravi kerur <rkerur@gmail.com>]

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Hi Daniel,

These registers are(DMA, statistics, and other h/w related to NIC), I just
want to read those registers and in very few cases write to them. Currently,
I can run those applications in dom0 and access directly but I wanted to
check if anything is possible from domU? Other thing I tried using sockets
from domU to dom0(albeit I had clear firewall settings in dom0) but Citrix
support forum mentioned it is not the recommended way. I am not sure whether
I answered your question, let me know if you need additional info.

Thanks
-RK

On Tue, Feb 16, 2010 at 7:26 PM, Daniel Stodden
<daniel.stodden@citrix.com>wrote:

> On Mon, 2010-02-15 at 10:54 -0500, ravi kerur wrote:
> > Paul,
> >
> > Registers are not in netback, they are h/w registers on NIC and the
> > driver supports reads/writes via ioctl calls. Driver is in dom0 and
> > application which reads/writes registers is run in domU.
>
> Why do you want to map or preserve some register interface?
>
> Is this some sort of hardware multiplex? As Konrad pointed out, in that
> case a PV driver is probably the wrong approach altogether.
>
> If what you want is just a bunch of extended control plane attributes,
> rather consider mapping them to xenstore.
>
> That's slightly more asynchronous and probably not a great option if you
> need a synchronous interface. Especially if you need individual return
> values, not just a bunch of fields to write into.
>
> If the latter case, next option would be some dedicated shared memory
> structure. But it's hard to imagine something like that to make
> sense. :}
>
> Daniel
>
>

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