linux-kernel - Re: [PATCH 1/3] tun: move internal flag defines out of uapi

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Message-ID: <1416417111.4763.10.camel@dcbw.local>
Date:	Wed, 19 Nov 2014 11:11:51 -0600
From:	Dan Williams <dcbw@...hat.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	linux-kernel@...r.kernel.org, rusty@...tcorp.com.au,
	davem@...emloft.net, Jason Wang <jasowang@...hat.com>,
	Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>,
	Tom Herbert <therbert@...gle.com>,
	Ben Hutchings <ben@...adent.org.uk>,
	Masatake YAMATO <yamato@...hat.com>, Xi Wang <xii@...gle.com>,
	netdev@...r.kernel.org, linux-api@...r.kernel.org
Subject: Re: [PATCH 1/3] tun: move internal flag defines out of uapi

On Wed, 2014-11-19 at 19:08 +0200, Michael S. Tsirkin wrote:
> On Wed, Nov 19, 2014 at 06:50:17PM +0200, Michael S. Tsirkin wrote:
> > On Wed, Nov 19, 2014 at 10:47:14AM -0600, Dan Williams wrote:
> > > On Wed, 2014-11-19 at 18:18 +0200, Michael S. Tsirkin wrote:
> > > > TUN_ flags are internal and never exposed
> > > > to userspace. Any application using it is almost
> > > > certainly buggy.
> > > 
> > > Except for TUN_TUN_DEV and TUN_TAP_DEV and TUN_TYPE_MASK...  which we're
> > > using (for some reason) in NetworkManager, though I'll happily convert
> > > those to IFF_* instead.  It might be worth #defining those to their
> > > IFF_* equivalents since their usage is not technically broken.
> > > 
> > > Dan
> > 
> > Hmm you are right, they happen to have the same value.
> > I'll send v2 leaving these in place.
> > 
> 
> Though I do think userspace shouldn't depend on them generally,
> so it might be a good idea to stop using them, even though
> I'll fix up my patches to avoid breaking this usecase.

Yeah, I'm doing an NM patch right now to use IFF_*.

Dan

> 
> 
> > > > Move them out to tun.c, we'll remove them in follow-up patches.
> > > > Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> > > > ---
> > > >  include/uapi/linux/if_tun.h | 14 --------------
> > > >  drivers/net/tun.c           | 14 ++++++++++++++
> > > >  2 files changed, 14 insertions(+), 14 deletions(-)
> > > > 
> > > > diff --git a/include/uapi/linux/if_tun.h b/include/uapi/linux/if_tun.h
> > > > index e9502dd..b82c276 100644
> > > > --- a/include/uapi/linux/if_tun.h
> > > > +++ b/include/uapi/linux/if_tun.h
> > > > @@ -23,20 +23,6 @@
> > > >  /* Read queue size */
> > > >  #define TUN_READQ_SIZE	500
> > > >  
> > > > -/* TUN device flags */
> > > > -#define TUN_TUN_DEV 	0x0001	
> > > > -#define TUN_TAP_DEV	0x0002
> > > > -#define TUN_TYPE_MASK   0x000f
> > > > -
> > > > -#define TUN_FASYNC	0x0010
> > > > -#define TUN_NOCHECKSUM	0x0020
> > > > -#define TUN_NO_PI	0x0040
> > > > -/* This flag has no real effect */
> > > > -#define TUN_ONE_QUEUE	0x0080
> > > > -#define TUN_PERSIST 	0x0100	
> > > > -#define TUN_VNET_HDR 	0x0200
> > > > -#define TUN_TAP_MQ      0x0400
> > > > -
> > > >  /* Ioctl defines */
> > > >  #define TUNSETNOCSUM  _IOW('T', 200, int) 
> > > >  #define TUNSETDEBUG   _IOW('T', 201, int) 
> > > > diff --git a/drivers/net/tun.c b/drivers/net/tun.c
> > > > index 2e18ddd..81735f5 100644
> > > > --- a/drivers/net/tun.c
> > > > +++ b/drivers/net/tun.c
> > > > @@ -103,6 +103,20 @@ do {								\
> > > >  } while (0)
> > > >  #endif
> > > >  
> > > > +/* TUN device flags */
> > > > +#define TUN_TUN_DEV 	0x0001
> > > > +#define TUN_TAP_DEV	0x0002
> > > > +#define TUN_TYPE_MASK   0x000f
> > > > +
> > > > +#define TUN_FASYNC	0x0010
> > > > +#define TUN_NOCHECKSUM	0x0020
> > > > +#define TUN_NO_PI	0x0040
> > > > +/* This flag has no real effect */
> > > > +#define TUN_ONE_QUEUE	0x0080
> > > > +#define TUN_PERSIST 	0x0100
> > > > +#define TUN_VNET_HDR 	0x0200
> > > > +#define TUN_TAP_MQ      0x0400
> > > > +
> > > >  #define GOODCOPY_LEN 128
> > > >  
> > > >  #define FLT_EXACT_COUNT 8
> > > 
> --
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