Re: [Qemu-devel] [PATCH 0/5] libqos: add ability to pop buffers from virtqueue

[Stefan Hajnoczi]

On Thu, May 05, 2016 at 09:32:12AM +0100, Stefan Hajnoczi wrote:
> The libqos virtio framework currently offers no way to pop buffers off the
> virtqueue.  Existing test cases are trivial and therefore get away without
> reclaiming buffers.  More extensive tests really do need to pop buffers and do
> the housekeeping associated with the 'used' ring.
> 
> This patch series adds qvirtqueue_get_buf() and qvirtio_wait_queue_buf() for
> popping buffers off the virtqueue.  The code is based on my recent "[PATCH
> for-2.7 0/8] libqos: use standard virtio headers" series which has not been
> merged yet.
> 
> I am sending a new test case for the virtio-vsock device in a separate email
> thread.  The virtio-vsock test uses the new qvirtio_wait_queue_buf() function.
> 
> Stefan Hajnoczi (5):
>   libqos: fix virtio descriptor free list
>   libqos: fix virtio num_free descriptor counter
>   libqos: add virtio buffer token
>   libqos: add qvirtqueue_get_buf()
>   libqos: add qvirtio_wait_queue_buf()
> 
>  tests/libqos/virtio.c    | 146 
> +++++++++++++++++++++++++++++++++++++++++++----
>  tests/libqos/virtio.h    |  13 ++++-
>  tests/virtio-blk-test.c  |  54 +++++++++---------
>  tests/virtio-net-test.c  |   6 +-
>  tests/virtio-scsi-test.c |   8 +--
>  5 files changed, 181 insertions(+), 46 deletions(-)

I'll resend this again in the future.

For the time being there is no qvirtio_wait_queue_buf() user in the
source tree so let's wait.  My vhost-vsock tests will use this and any
more advanced virtio device tests will need it too.

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