Re: [Qemu-devel] [PATCH 07/12] virtio: introduce virtio_queue_del()

[Jason Wang]

On 01/08/2013 03:14 PM, Michael S. Tsirkin wrote:
> On Fri, Dec 28, 2012 at 06:31:59PM +0800, Jason Wang wrote:
>> Some device (such as virtio-net) needs the ability to destroy or re-order the
>> virtqueues, this patch adds a helper to do this.
>>
>> Signed-off-by: Jason Wang <jasowang>
> Actually del_queue unlike what the subject says :)

Oh, yes, will correct this.
>
>> ---
>>  hw/virtio.c |    9 +++++++++
>>  hw/virtio.h |    2 ++
>>  2 files changed, 11 insertions(+), 0 deletions(-)
>>
>> diff --git a/hw/virtio.c b/hw/virtio.c
>> index f40a8c5..bc3c9c3 100644
>> --- a/hw/virtio.c
>> +++ b/hw/virtio.c
>> @@ -700,6 +700,15 @@ VirtQueue *virtio_add_queue(VirtIODevice *vdev, int 
>> queue_size,
>>      return &vdev->vq[i];
>>  }
>>  
>> +void virtio_del_queue(VirtIODevice *vdev, int n)
>> +{
>> +    if (n < 0 || n >= VIRTIO_PCI_QUEUE_MAX) {
>> +        abort();
>> +    }
>> +
>> +    vdev->vq[n].vring.num = 0;
>> +}
>> +
>>  void virtio_irq(VirtQueue *vq)
>>  {
>>      trace_virtio_irq(vq);
>> diff --git a/hw/virtio.h b/hw/virtio.h
>> index 7c17f7b..f6cb0f9 100644
>> --- a/hw/virtio.h
>> +++ b/hw/virtio.h
>> @@ -138,6 +138,8 @@ VirtQueue *virtio_add_queue(VirtIODevice *vdev, int 
>> queue_size,
>>                              void (*handle_output)(VirtIODevice *,
>>                                                    VirtQueue *));
>>  
>> +void virtio_del_queue(VirtIODevice *vdev, int n);
>> +
>>  void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem,
>>                      unsigned int len);
>>  void virtqueue_flush(VirtQueue *vq, unsigned int count);
>> -- 
>> 1.7.1