linux-kernel - Re: [PATCH 3/3] net: macvtap driver

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Date:	Fri, 29 Jan 2010 20:49:52 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	David Miller <davem@...emloft.net>,
	Stephen Hemminger <shemminger@...ux-foundation.org>,
	Patrick McHardy <kaber@...sh.net>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Or Gerlitz <ogerlitz@...taire.com>, netdev@...r.kernel.org,
	bridge@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] net: macvtap driver

On Friday 29 January 2010, Michael S. Tsirkin wrote:
> > That may well be, I haven't tried vlan. What do you think it should do
> > then?
> 
> Look at eth_type for a more complete packet parsing.

ok. I initially called that but it crashed because the skb was not initialized
properly at that point. I'll have a look.

> > > > +/*
> > > > + * provide compatibility with generic tun/tap interface
> > > > + */
> > > > +static long macvtap_ioctl(struct file *file, unsigned int cmd,
> > > > +                   unsigned long arg)
> > > > +{
> > > 
> > > All of these seem to be stubs, and tun has many more that you didn't
> > > stub out. So, why do you bother to support any ioctls at all?
> > 
> > Again, minimum features to get things going. qemu fails to open
> > the device if these ioctls are not implemented, but any of the
> > more advanced features are left out.
> 
> This is strange, could be application bug.  E.g. send buf size is
> relatively new and apps should handle failure gracefully.  IMO,
> returning success and ignoring the value is not a good idea.  How about
> we just fix qemu?  What about other apps?

Ok, I'll go through the ioctls again and make sure they behave correctly
they way you said. I haven't tried against against anything but qemu and
cat.

	Arnd
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