From mboxrd@z Thu Jan  1 00:00:00 1970
From: Cornelia Huck <huckc@de.ibm.com>
Date: Mon, 23 Apr 2007 09:03:10 +0000
Subject: Re: Excluding some device types from persistent-net (xen, s390)
Message-Id: <20070423110310.764235f6@gondolin.boeblingen.de.ibm.com>
List-Id: <linux-hotplug.vger.kernel.org>
References: <200704120944.10520.zzam@gentoo.org>
In-Reply-To: <200704120944.10520.zzam@gentoo.org>
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To: linux-hotplug@vger.kernel.org

On Sat, 21 Apr 2007 15:35:45 +0200,
Matthias Schwarzott <zzam@gentoo.org> wrote:

> > > 2. How to get the unique identifier of that ccwgroup?
> > > First from a udev-rule and then from write_net_rules?
> >
> > Can't this simply be stripped from DEVPATH (last element)?
> 
> As I do not know how the DEVPATH for such devices look like, some info like 
> udevinfo -a -p /class/net/eth? or file lists in sysfs could help.

<btw: it would be nice if you kept me on cc:>

ccwgroup devices sit under a ccw driver specific root device, like

/sys/devices/qeth/0.0.f5f0/

for a qeth device or

/sys/devices/cu3088/0.0.7000/

for a ctc device.

In any case, the network interface is like

/sys/devices/qeth/0.0.f5f0/net/eth0

or

/sys/devices/cu3088/0.0.7000/net/ctc0,

so you should be able to use ID from the parent's parent.

udevinfo -a -p /sys/class/net/ctc0/ says:

  looking at device '/devices/cu3088/0.0.7000/net/ctc0':
    KERNEL="ctc0"
    SUBSYSTEM="net"
    DRIVER=""
    SYSFS{weight}="0"
    SYSFS{tx_queue_len}="100"
    SYSFS{flags}="0x90"
    SYSFS{mtu}="32760"
    SYSFS{operstate}="down"
    SYSFS{broadcast}=""
    SYSFS{address}=""
    SYSFS{link_mode}="0"
    SYSFS{type}="256"
    SYSFS{features}="0x0"
    SYSFS{ifindex}="7"
    SYSFS{iflink}="7"
    SYSFS{addr_len}="0"

  looking at parent device '/devices/cu3088/0.0.7000/net':
    ID="net"
    BUS=""
    DRIVER=""

  looking at parent device '/devices/cu3088/0.0.7000':
    ID="0.0.7000"
    BUS="ccwgroup"
    DRIVER="ctc"
    SYSFS{stats}="0"
    SYSFS{loglevel}="71"
    SYSFS{buffer}="32768"
    SYSFS{type}="CTC/A"
    SYSFS{protocol}="0"
    SYSFS{online}="1"
    SYSFS{uevent}="DRIVER=ctc"

  looking at parent device '/devices/cu3088':
    ID="cu3088"
    BUS=""
    DRIVER=""
    SYSFS{uevent}=""

HTH,
Cornelia.


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