Re: [Qemu-devel] [RFC PATCH] net: introduce monitor command to query mactables

[Eric Blake]

On 04/11/2013 09:11 AM, Amos Kong wrote:
> We want to do macvtap programming by libvirt, this patch added
> a monitor command to query rx mode information. I will also
> work on another patch to add QMP event notification for rx-mode
> changing. Libvirt will sync the rx-mode change to macvtap
> devices, there maybe exist an un-controlled delay, guests
> normally expect rx mode updates immediately, it's another
> separate issue.
> 

> +++ b/qapi-schema.json
> @@ -3513,3 +3513,40 @@
>      '*asl_compiler_rev':  'uint32',
>      '*file':              'str',
>      '*data':              'str' }}
> +
> +# @MacTableInfo:
> +#
> +# Mac table information.
> +#
> +# @name: the name of nic device
> +#
> +# @unicast: #optional a list of unicast mac strings
> +#
> +# @multicast: #optional a list of multicast mac strings

Quite a few undocumented fields in relation to...

> +#
> +# Since 1.5
> +##
> +{ 'type': 'MacTableInfo',
> +  'data': {
> +    'name':            'str',
> +    '*promisc':        'bool',
> +    '*allmulti':       'bool',
> +    '*alluni':         'bool',
> +    '*nomulti':        'bool',
> +    '*nouni':          'bool',
> +    '*nobcast':        'bool',
> +    '*multi_overflow': 'bool',
> +    '*uni_overflow':   'bool',
> +    '*unicast':        ['String'],
> +    '*multicast':      ['String'] }}

...the size of the struct itself.

Why ['String'] instead of the simpler ['str']?  That's just adding
additional JSON structure for no discernible gain (unless it is a
workaround for a weakness in the code generation tool not allowing an
array of a native JSON type - in which case, let's fix that).

s/_overflow/-overflow/2 - we prefer '-' over '_' in new QMP interfaces.

> +
> +##
> +# @query-mac-table:
> +#
> +# Return mac tables information of nic devices
> +#
> +# Returns: @MacTableInfo on success
> +#
> +# Since: 1.5
> +##
> +{ 'command': 'query-mac-table', 'returns': ['MacTableInfo'] }

Seems useful.

> +-> { "execute": "query-mac-table"}
> +<- {"return": [
> +        {
> +            "name": "virtio-net-pci.0",
> +            "uni_overflow": false,
> +            "nobcast": false,
> +            "promisc": ,

Invalid JSON.

> +            "nouni": false,
> +            "nomulti": false,
> +            "allmulti": false,
> +            "multi_overflow": false,
> +            "alluni": false
> +            "unicast": [
> +                {
> +                    "str": "33:33:ff:00:00:00"
> +                }

If you use 'str' instead of 'String', this would be:

"unicast": [ "33:33:ff:00:00:00" ]

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

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