Re: [Xen-devel] Q on netfront/netback driver

[Daniel Stodden <daniel.stodden@xxxxxxxxxx>]

On Tue, 2010-02-02 at 23:14 -0500, ravi kerur wrote:
> Hi Konrad,
> 
> I thought Citrix Xenserver is based on Xen kernel and it inherited all
> of Xen mgmt cli and other tools. 
> 
> I have downloaded source code from
> http://www.citrix.com/lang/English/lp/lp_1688623.asp
> and have looked into product cd 1(in which I found netfront and
> netback source code), product cd 4(probably tools). Unfortunately
> don't find anything related to /xen/tools/hotplug... Any inputs?

Backend management in XCP relies much less on hotplug scripts. Of course
there are still callbacks for backend device creation and removal on
xenbus. These events are however mainly bridged to a xenstore update
(online=yes/no). The rest is mainly handled by xapi. Main piece of code
would be xen-api/ocaml/xenops/device|hotplug.ml. Backend device shutdown
and subsequent removal is a primary example which works quite
differently.

Daniel

> Thanks
> -RK
> 
> On Mon, Feb 1, 2010 at 1:16 PM, Konrad Rzeszutek Wilk
> <konrad.wilk@xxxxxxxxxx> wrote:
>         >  In addition, I had follow-up question on creation of "vif"
>         interface(this
>         > is what I was referring to when I mentioned about
>         instantiation of
>         > netfront/netback), if I were to change this "vif" name to
>         something else,
>         > which part of the code should be modified. I have been
>         searching for this
>         
>         
>         You definitly will need to modify the udev rules and
>         potentially a bunch
>         of shell scripts in: xen/tools/hotplug/Linux
>         
>         If you mean the source code of the kernel, look in
>         drivers/xen/netback/* files.
>         .. snip ..
>         > > > However, I do not see the drivers listed when "lsmod" is
>         executed on dom0
>         > > or
>         > > > domU.
>         > >
>         > > It might be very well compiled in, at which point it is
>         not a module.
>         > > Look in your .config file for NETBACK.
>         
>         Ah, I was incorrect. It is CONFIG_XEN_NETDEV_BACKEND.
> 



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