Re: [Xen-devel] no udev events in netback domU driver domain 2.6.32.14

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Tue, Jul 06, 2010 at 10:04:03PM -0400, philip tricca wrote:
> I've spent a bit trying to configure and unprivileged network driver
> domain using the current 2.6.32.14 pvops kernel (haven't up'd to .15
> due to incompatibility with 4.0.0 release).  I've been partially
> successful but am failing in what I'd think would be the last step:
> getting udev rules to fire when attaching network devices using
> xen-netback & xen-netfront drivers.  From my reading of the pvops
> wiki page there's a possibility that the wiring between the drivers
> and the udev events may not have been forward ported completely.  In
> fact, using 'udevadm monitor' I don't see any events at all when the
> vif is created in the driver domain and when eth0 is created in the
> client (both are created when xm network-attach is run).

You won't see the 'eth0' being created from Dom0 side. But you should
see the rest:
> 
> Is anyone familiar enough with these portions of the driver to
> comment on this?  If this "should" be working I can post the details
> of my setup and debug information if necessary but I don't want to
> flood the list with a huge email if it isn't necessary.

This is what I get:

[root@phenom ~]#  udevadm monitor --kernel --env --property
monitor will print the received events for:
KERNEL - the kernel uevent

KERNEL[1278510109.977326] add      /devices/vbd-2-51712 (xen-backend)
UDEV_LOG=3
ACTION=add
DEVPATH=/devices/vbd-2-51712
SUBSYSTEM=xen-backend
XENBUS_TYPE=vbd
XENBUS_PATH=backend/vbd/2/51712
XENBUS_BASE_PATH=backend
SEQNUM=2530

KERNEL[1278510110.042021] add      /devices/vbd-2-51744 (xen-backend)
UDEV_LOG=3
ACTION=add
DEVPATH=/devices/vbd-2-51744
SUBSYSTEM=xen-backend
XENBUS_TYPE=vbd
XENBUS_PATH=backend/vbd/2/51744
XENBUS_BASE_PATH=backend
SEQNUM=2531

KERNEL[1278510110.112319] add      /devices/vif-2-0 (xen-backend)
UDEV_LOG=3
ACTION=add
DEVPATH=/devices/vif-2-0
SUBSYSTEM=xen-backend
XENBUS_TYPE=vif
XENBUS_PATH=backend/vif/2/0
XENBUS_BASE_PATH=backend
SEQNUM=2532

KERNEL[1278510110.134121] add      /devices/vif-2-0/net/vif2.0 (net)
UDEV_LOG=3
ACTION=add
DEVPATH=/devices/vif-2-0/net/vif2.0
SUBSYSTEM=net
INTERFACE=vif2.0
IFINDEX=6
SEQNUM=2533

KERNEL[1278510110.134562] online   /devices/vif-2-0 (xen-backend)
UDEV_LOG=3
ACTION=online
DEVPATH=/devices/vif-2-0
SUBSYSTEM=xen-backend
DRIVER=vif
XENBUS_TYPE=vif
XENBUS_PATH=backend/vif/2/0
XENBUS_BASE_PATH=backend
script=/etc/xen/scripts/vif-bridge
vif=vif2.0
SEQNUM=2534

KERNEL[1278510110.343838] add      /devices/console-2-0 (xen-backend)
UDEV_LOG=3
ACTION=add
DEVPATH=/devices/console-2-0
SUBSYSTEM=xen-backend
XENBUS_TYPE=console
XENBUS_PATH=backend/console/2/0
XENBUS_BASE_PATH=backend
SEQNUM=2535


and then when I shut the guest:

5

KERNEL[1278510216.746063] offline  /devices/vif-2-0 (xen-backend)
UDEV_LOG=3
ACTION=offline
DEVPATH=/devices/vif-2-0
SUBSYSTEM=xen-backend
DRIVER=vif
XENBUS_TYPE=vif
XENBUS_PATH=backend/vif/2/0
XENBUS_BASE_PATH=backend
script=/etc/xen/scripts/vif-bridge
vif=vif2.0
SEQNUM=2536

KERNEL[1278510216.785420] remove   /devices/vif-2-0/net/vif2.0 (net)
UDEV_LOG=3
ACTION=remove
DEVPATH=/devices/vif-2-0/net/vif2.0
SUBSYSTEM=net
INTERFACE=vif2.0
IFINDEX=6
SEQNUM=2537


KERNEL[1278510217.514812] remove   /devices/console-2-0 (xen-backend)
UDEV_LOG=3
ACTION=remove
DEVPATH=/devices/console-2-0
SUBSYSTEM=xen-backend
XENBUS_TYPE=console
XENBUS_PATH=backend/console/2/0
XENBUS_BASE_PATH=backend
SEQNUM=2538

KERNEL[1278510217.588877] remove   /devices/vbd-2-51712 (xen-backend)
UDEV_LOG=3
ACTION=remove
DEVPATH=/devices/vbd-2-51712
SUBSYSTEM=xen-backend
XENBUS_TYPE=vbd
XENBUS_PATH=backend/vbd/2/51712
XENBUS_BASE_PATH=backend
SEQNUM=2539

KERNEL[1278510217.596581] remove   /devices/vbd-2-51744 (xen-backend)
UDEV_LOG=3
ACTION=remove
DEVPATH=/devices/vbd-2-51744
SUBSYSTEM=xen-backend
XENBUS_TYPE=vbd
XENBUS_PATH=backend/vbd/2/51744
XENBUS_BASE_PATH=backend
SEQNUM=2540


KERNEL[1278510217.602293] remove   /devices/vif-2-0 (xen-backend)
UDEV_LOG=3
ACTION=remove
DEVPATH=/devices/vif-2-0
SUBSYSTEM=xen-backend
XENBUS_TYPE=vif
XENBUS_PATH=backend/vif/2/0
XENBUS_BASE_PATH=backend
SEQNUM=2541

> 
> TIA,
> - Philip
> 
> 
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