Linux Virtualization - Aug 2019 - [PATCH v2 2/2] virtio_ring: packed ring: fix virtqueue_detach_unused_buf

On Thu, Aug 08, 2019 at 05:06:06PM +0530, Pankaj Gupta
wrote:
> This patch makes packed ring code compatible with split ring in function
> 'virtqueue_detach_unused_buf_*'.
What does that mean?  What does this "fix"?

thanks,

greg k-h

> > This patch makes packed ring code compatible with split ring in
function
> > 'virtqueue_detach_unused_buf_*'.
> 
> What does that mean?  What does this "fix"?
Patch 1 frees the buffers When a port is unplugged from the virtio
console device. It does this with the help of
'virtqueue_detach_unused_buf_split/packed'
function. For split ring case, corresponding function decrements avail ring
index.
For packed ring code, this functionality is not available, so this patch adds
the
required support and hence help to remove the unused buffer completely.

Thanks,
Pankaj  
> 
> thanks,
> 
> greg k-h
>

On Thu, Aug 08, 2019 at 08:28:46AM -0400, Pankaj Gupta
wrote:
> 
> 
> > > This patch makes packed ring code compatible with split ring in
function
> > > 'virtqueue_detach_unused_buf_*'.
> > 
> > What does that mean?  What does this "fix"?
> 
> Patch 1 frees the buffers When a port is unplugged from the virtio
> console device. It does this with the help of
'virtqueue_detach_unused_buf_split/packed'
> function. For split ring case, corresponding function decrements avail ring
index.
> For packed ring code, this functionality is not available, so this patch
adds the
> required support and hence help to remove the unused buffer completely.
Explain all of this in great detail in the changelog comment.  What you
have in there today does not make any sense.

thanks,

greg k-h