libvirt users - Oct 2014 - Re: HostDevev SCSI Devices

http://libvirt.org/formatdomain.html#elementsHostDevSubsys

At this description used "drive"-typed address for SCSI.

But when i get xml-description of scsi-devices by 
<code>
unsigned int flags                 VIR_CONNECT_LIST_NODE_DEVICES_CAP_SCSI_HOST ;
int ret = virConnectListAllNodeDevices
                (currWorkConnect, &nodeDevices, flags);
then get by virNodeDeviceGetXMLDesc(nodeDevices[i], 0));
</code>

i have same:
<device>
  <name>scsi_host2</name>
  <path>/sys/devices/pci0000:00/0000:00:1f.2/ata3/host2</path>
  <parent>pci_0000_00_1f_2</parent>
  <capability type='scsi_host'>
    <host>2</host>
    <unique_id>3</unique_id>
  </capability>
</device>
.

I understand that this device description contains a
"pci"-typed addresses. Then where to get the "scsi"-typed
address?

-- 
Fl@sh

On Sun, Oct 19, 2014 at 10:01:26PM +0400, Fl@sh wrote:
> http://libvirt.org/formatdomain.html#elementsHostDevSubsys
> 
> At this description used "drive"-typed address for SCSI.
> 
> But when i get xml-description of scsi-devices by 
> <code>
> unsigned int flags >                
VIR_CONNECT_LIST_NODE_DEVICES_CAP_SCSI_HOST ;
You've asked for the SCSI HBA here - ie the drive *controller*
not the drives themselves.

    VIR_CONNECT_LIST_NODE_DEVICES_CAP_SCSI_HOST     = 1 << 5,  /* SCSI
Host Bus Adapter */
    VIR_CONNECT_LIST_NODE_DEVICES_CAP_SCSI_TARGET   = 1 << 6,  /* SCSI
Target */
    VIR_CONNECT_LIST_NODE_DEVICES_CAP_SCSI          = 1 << 7,  /* SCSI
device */

You want CAP_SCSI for the actual devices.

Regards,
Daniel
-- 
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On Mon, 20 Oct 2014 09:27:49 +0100
"Daniel P. Berrange" <berrange@redhat.com> wrote:
> On Sun, Oct 19, 2014 at 10:01:26PM +0400, Fl@sh wrote:
> > http://libvirt.org/formatdomain.html#elementsHostDevSubsys
.....
> You want CAP_SCSI for the actual devices.
> 
Ok. But i have new question:
XML-description into docs contains:
 ...
  <devices>
    <hostdev mode='subsystem' type='scsi'
sgio='filtered'
rawio='yes'>
      <source>
        <adapter name='scsi_host0'/>
        <address type='scsi' bus='0' target='0'
unit='0'/>
      </source>
      ....
  </devices>
  ...
It contain the address of device with three attributes (bus,
target and unit). But SCSI addressing contain four attributes
(host, bus, target, lun) and in XML-description from
virNodeDeviceGetXMLDesc device capabilities contain this
parameters too. Same:
...
  <capability type='scsi'>
    <host>4</host>
    <bus>0</bus>
    <target>0</target>
    <lun>0</lun>
    <type>cdrom</type>
  </capability>
...

How i can use this four parameters into XML-description of
SCSI HostDev for set device? Why in first case it have 3
attributes, but in second case it have 4 attributes?

-- 
Fl@sh