netdev - Re: [GIT] Networking

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Date:	Thu, 2 May 2013 09:03:37 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	David Miller <davem@...emloft.net>
Cc:	torvalds@...ux-foundation.org, hayeswang@...ltek.com,
	akpm@...ux-foundation.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [GIT] Networking

On Thu, May 02, 2013 at 02:45:52AM -0400, David Miller wrote:
> From: Linus Torvalds <torvalds@...ux-foundation.org>
> Date: Wed, 1 May 2013 21:55:38 -0700
> 
> > I think the positions of those bits matter, and adding
> > NETIF_F_HW_VLAN_STAG_*_BIT randomly in the middle broke things. That's
> > backed up by the fact that we have things like
> > 
> >       __UNUSED_NETIF_F_1
> > 
> > and
> > 
> >           /**/NETIF_F_GSO_SHIFT,          /* keep the order of SKB_GSO_* bits */
> >         NETIF_F_TSO_BIT                 /* ... TCPv4 segmentation */
> >                 = NETIF_F_GSO_SHIFT,
> > 
> > in that array. There is some ordering, and there is some meaning to
> > the bit numbers, and adding the *_STAG_* bits in the middle broke some
> > subtle dependency.
> 
> The other thing this does is it pushes some bits past bit 31.
> 
> netdev_features_t, which holds these masks, is 64-bit but we've
> already seen one place in a driver where a 32-bit value was being
> used.
> 
> I'll look more deeply into this, thanks.

I'll also have a look at this.
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