Re: [Qemu-devel] [PATCH] qemu-ga: add guest-network-get-interface-stat command

[Cornelia Huck <cornelia.huck@de.ibm.com>]

On Thu, 20 Apr 2017 00:57:08 +0800
ZhiPeng Lu <lu.zhipeng@zte.com.cn> wrote:

> diff --git a/qga/qapi-schema.json b/qga/qapi-schema.json
> index a02dbf2..60111dc 100644
> --- a/qga/qapi-schema.json
> +++ b/qga/qapi-schema.json
> @@ -1042,3 +1042,37 @@
>    'data':    { 'path': 'str', '*arg': ['str'], '*env': ['str'],
>                 '*input-data': 'str', '*capture-output': 'bool' },
>    'returns': 'GuestExec' }
> +##
> +# @GuestNetworkInterfaceStat:
> +#
> +# @rx_bytes: received bytes of interface
> +#
> +# @rx_packets: received packets of interface
> +#
> +# @rx_errs: received error packets of interface
> +# @rx_drop: received drop packets of interface
> +#
> +# Since: 2.10
> +##
> +{ 'struct': 'GuestNetworkInterfaceStat',
> +  'data': {'rx_bytes': 'uint64',
> +            'rx_packets': 'uint64',
> +            'rx_errs': 'uint64',
> +            'rx_drop': 'uint64',
> +            'tx_bytes': 'uint64',
> +            'tx_packets': 'uint64',
> +            'tx_errs': 'uint64',
> +            'tx_drop': 'uint64'
> +           } }
> +##
> +# @guest-network-get-interface-stat:
> +#
> +# Get list of interface stat
> +#
> +# Returns: List of GuestNetworkInterfaceStat on success.
> +#
> +# Since: 2.10
> +##
> +{ 'command': 'guest-network-get-interface-stat',
> +  'data':    {'bus': 'int64', 'slot': 'int64', 'function': 'int64','netname':'str'},
> +  'returns': ['GuestNetworkInterfaceStat'] }

Disregarding the question whether this command should be added to the
guest agent (I'll leave that to others to discuss), I don't think it's
a good idea to enshrine pci identifiers here, as it means that we would
need to add a new interface for every non-pci network device.

Can you use a more general device identifier interface? It's fine to
only support pci for now (as that is likely your use case anyway), but
there should be a way to extend this in the future.