netdev - Re: [PATCH net-next v2 4/4] virtio-net: initial debugfs support, export mergeable rx buffer size

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Date:	Wed, 8 Jan 2014 21:21:09 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Jason Wang <jasowang@...hat.com>
Cc:	Michael Dalton <mwdalton@...gle.com>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	Eric Dumazet <edumazet@...gle.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH net-next v2 4/4] virtio-net: initial debugfs support,
 export mergeable rx buffer size

On Wed, Jan 08, 2014 at 02:34:31PM +0800, Jason Wang wrote:
> On 01/07/2014 01:25 PM, Michael Dalton wrote:
> > Add initial support for debugfs to virtio-net. Each virtio-net network
> > device will have a directory under /virtio-net in debugfs. The
> > per-network device directory will contain one sub-directory per active,
> > enabled receive queue. If mergeable receive buffers are enabled, each
> > receive queue directory will contain a read-only file that returns the
> > current packet buffer size for the receive queue.
> >
> > Signed-off-by: Michael Dalton <mwdalton@...gle.com>
> 
> This looks more complicated than expected. How about just adding an
> entry in sysfs onto the existed network class device which looks more
> simpler?

sysfs is part of userspace ABI, I think that's the main issue: can we
commit to this attribute being there in the future?
If yes we can use sysfs but maybe it seems reasonable to use debugfs for
a while until we are more sure of this.
I don't mind either way.
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