linux-kernel - Re: [2.6.24-rc6-mm1]Build failure in drivers/net/ehea/ehea

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Date:	Tue, 12 Feb 2008 16:28:33 +0100
From:	Christoph Raisch <RAISCH@...ibm.com>
To:	Greg KH <greg@...ah.com>
Cc:	akpm@...ux-foundation.org, Jan-Bernd Themann <THEMANN@...ibm.com>,
	Joachim Fenkes <FENKES@...ibm.com>,
	linux-kernel@...r.kernel.org, Nathan Lynch <ntl@...ox.com>,
	ossthema@...ux.vnet.ibm.com, sam@...nborg.org,
	Sudhir Kumar <skumar@...ux.vnet.ibm.com>
Subject: Re: [2.6.24-rc6-mm1]Build failure in drivers/net/ehea/ehea_main.c

Greg KH <greg@...ah.com> wrote on 07.02.2008 23:17:12:

> On Tue, Jan 29, 2008 at 03:20:20PM +0100, Christoph Raisch wrote:
> What is it?  It has to live on some kind of bus, right?

It is a piece of hardware with a firmware/hypervisor abstraction layer on
top.
The hypervisor provides virtualization interfaces to
add and remove ethernet adapters and ports.
Each port is represented in the open firmware device tree (OFDT) as a
subnode of the
ehea adapter node.

System P has a userspace DLPAR application communicating with firmware, the
kernel, and
the hardware management console to change all that on the flight.
This tool needs a capability to identify which open firmware device tree
entry
belongs to which ethernet device.
Each node created by the ibmebus driver has a devspec entry associated to
the
device node in OFDT, used by the DLPAR application.
Each port created by the ibmebus driver has a devspec entry associated to
the
port node in OFDT, used by the DLPAR application.

> >
> > host:/ # ls -l /sys/bus/pci/devices/0000\:c8\:01.0/
> > total 0
...
> > -r--r--r-- 1 root root   4096 2008-01-29 14:26 devspec
...

> >
> > These pci functions corresponds to a
> > /sys/bus/ibmebus/devices/789D.001.XXXXXX-P1/port0
> > and
> > /sys/bus/ibmebus/devices/789D.001.XXXXXX-P1/port1
> >
> > The busdriver currently does not find out, how many ports are in a
> > /sys/bus/ibmebus/devices/789D.001.XXXXXX-P1.
> > This is up to the hardware specific driver responsible for ehea or
ehca.
> > Think of a PCI card where the PCI busdriver
> > can not determine how many ports are implemented on the card.
> >
> > How should this be mapped to /sys ?
> >
> > Should we try to "flatten" the ports to something like
> > /sys/bus/ibmebus/devices/789D.001.XXXXXX-P1
> > /sys/bus/ibmebus/devices/789D.001.XXXXXX-P1_port0
> > /sys/bus/ibmebus/devices/789D.001.XXXXXX-P1_port1
> > ...which means physical hierarchy information would look a bit strange,
> > but could be the simpler one.
>
> No.  Why have a separate "port" device for every ethernet port?  What
> keeps you from just creating the different network devices for your
> device, and pointing the parent to the same 789D.001.XXXXXX-P1 device?
>
>
> I think you all are trying to make this more complex than it really is
> :)

If you register multiple netdevs in a ehea adapter node,
how is it possible to find out which ethXXX belongs to which devspec port
entry in the OFDT?

Is there a simpler way than the one we chose to get this in addition?

>
> thanks,
>
> greg k-h
Gruss / Regards
Christoph Raisch

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