Re: [Qemu-devel] [PATCH for mst/pci] output nc->name in NIC_RX_FILTER_CHANGED event

[Markus Armbruster]

Amos Kong <address@hidden> writes:

> netclient 'name' entry in event is useful for management to know
> which device is changed. n->netclient_name is not always set.
> This patch changes to use nc->name. If we don't assign 'id',
> qemu will set a generated name to nc->name.
>
> Signed-off-by: Amos Kong <address@hidden>
> ---
>  hw/net/virtio-net.c | 11 +++--------
>  1 file changed, 3 insertions(+), 8 deletions(-)
>
> diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
> index c88403a..e4d9752 100644
> --- a/hw/net/virtio-net.c
> +++ b/hw/net/virtio-net.c
> @@ -200,14 +200,9 @@ static void rxfilter_notify(NetClientState *nc)
>      VirtIONet *n = qemu_get_nic_opaque(nc);
>  
>      if (nc->rxfilter_notify_enabled) {
> -        if (n->netclient_name) {
> -            event_data = qobject_from_jsonf("{ 'name': %s, 'path': %s }",
> -                                    n->netclient_name,
> -                                    
> object_get_canonical_path(OBJECT(n->qdev)));
> -        } else {
> -            event_data = qobject_from_jsonf("{ 'path': %s }",
> -                                    
> object_get_canonical_path(OBJECT(n->qdev)));
> -        }
> +        event_data = qobject_from_jsonf("{ 'name': %s, 'path': %s }",
> +                           nc->name,
> +                           object_get_canonical_path(OBJECT(n->qdev)));
>          monitor_protocol_event(QEVENT_NIC_RX_FILTER_CHANGED, event_data);
>          qobject_decref(event_data);

Is this on top of "[PATCH v3 0/2] mac programming over macvtap"?

Yes, qdev IDs are optional, and therefore can serve as reliable
identifier only when the user / management application always specifies
one, and even then, you're still screwed for auto-created devices.
Easily avoided for NICs, but yes, the problem is real.

However, I don't agree with the solution "use NetCientState name",
because that's too ad hoc, and not general.  Can we please use QOM
paths?