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