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Re: [libvirt] [PATCH v2 8/8] hostdev: Add iSCSI hostdev XML



On 08/05/2014 01:59 PM, John Ferlan wrote:

> Both are 'scsi' adapters - existing is 'scsi_host' and the new one is 'iscsi'.
> I'm unsure about putting the 'optional' attribute name really does. Not to
> confuse things further, but the next step in the evolution of this is to add
> a fiber channel adapter (eg, fc_host).
> 
> The "first" format is for the "scsi_host" with the valid XML being:

Seeing it in context helps.

> 
>     <hostdev mode='subsystem' type='scsi'>
>       <source>
>         <adapter name='scsi_host0'/>

Here, I think I see the solution to my earlier confusion.  If _this_
were written:

  <source protocol='adapter'>
    <adapter...

where the protocol='adapter' is optional (default, for back-compat),
then you know that <source>'s children will be <adapter> and <address>...

>         <address type='scsi' bus='0' target='0' unit='0'/>
>       </source>
>       <readonly/>
>       <address type='drive' controller='0' bus='0' target='0' unit='0'/>
>     </hostdev>
> 
> 
> The "second" format is for the "iscsi" valid XML for 'iscsi' is:
> 
>     <hostdev mode='subsystem' type='scsi'>
>       <source protocol='iscsi' name='iqn.2014-08.com.example:iscsi-nopool/1'>

...and here, protocol='iscsi' is mandatory, to describe that that
<source>'s children will be <host>.

>         <host name='example.com' port='3260'/>
>       </source>
>       <auth username='myuser'>
>         <secret type='iscsi' usage='libvirtiscsi'/>
>       </auth>

Is the <auth> something inherent to the overall hostdev, or something
only to the <source protocol='iscsi'>?  I think I'd rather see this
<auth> be a child of <source>, rather than a sibling.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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