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Re: [libvirt] [PATCH v6] npiv: Auto-generate WWN if it's not specified



On 2012年02月07日 21:29, Eric Blake wrote:
On 02/07/2012 06:38 AM, Osier Yang wrote:
The auto-generated WWN comply with the new addressing schema of WWN:

<quote>
the first nibble is either hex 5 or 6 followed by a 3-byte vendor
identifier and 36 bits for a vendor-specified serial number.
</quote>

We choose hex 5 for the first nibble. And for the 3-bytes vendor ID,
we uses the OUI according to underlying hypervisor type, (invoking
virConnectGetType to get the virt type). e.g. If virConnectGetType
returns "QEMU", we use Qumranet's OUI (00:1A:4A), if returns
ESX|VMWARE, we use VMWARE's OUI (00:05:69). Currently it only
supports qemu|xen|libxl|xenapi|hyperv|esx|vmware drivers. The last
36 bits are auto-generated.

+
+#define QUMRANET_OUI "001a4a"
+#define VMWARE_OUI "000569"
+#define MICROSOFT_OUI "0050f2"
+#define XEN_OUI "00163e"
+
+int
+virRandomGenerateWWN(char **wwn,
+                     const char *virt_type) {

I don't like this interface - it makes virrandom.c know too much.  A
better interface would be:

virRandomGenerateWWN(char **wwn, const char *oui)

where the caller is responsible for determining the appropriate OUI for
the hypervisor to be passed in.


I have thought this, but the problem is we want auto-generate the WWN,
the nodedevice driver doesn't known which OUI should be passed to
virRandomGenerateWWN in this case, unless we extend the API
virNodeDeviceCreateXML to accept a flag, or introduce a new API. I
guess we won't want to see this in this period. :-)

Regards,
Osier


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