netdev - Re: [PATCH net RFC] xen-netback: Fix grant ref resolution in RX path

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Date:	Thu, 15 May 2014 09:41:29 +0100
From:	Ian Campbell <Ian.Campbell@...rix.com>
To:	Zoltan Kiss <zoltan.kiss@...rix.com>
CC:	Eric Dumazet <eric.dumazet@...il.com>,
	<xen-devel@...ts.xenproject.org>, <wei.liu2@...rix.com>,
	<linux@...elenboom.it>, <paul.durrant@...rix.com>,
	<netdev@...r.kernel.org>, <david.vrabel@...rix.com>,
	<davem@...emloft.net>
Subject: Re: [PATCH net RFC] xen-netback: Fix grant ref resolution in RX path

On Wed, 2014-05-14 at 19:44 +0100, Zoltan Kiss wrote:
> On 14/05/14 17:40, Ian Campbell wrote:
> >
> > On Wed, 2014-05-14 at 14:25 +0100, Zoltan Kiss wrote:
> >
> >> But of course it should be carefully checked that functions which place
> >> frags into another frags arrays should call orphan_frags, e.g. I guess
> >> skb_shift does such thing. That's what I intend to start another thread
> >> about.
> >
> > I see Eric has posted a fix for skb_try_coalesce(), but is that likely
> > to be acceptable for 3.15? How many other similar patches are we
> > expecting and/or how long do you think this careful checking will take?
> >
> > Given that we are now at 3.15-rc5 I think we need to decide how to
> > proceed, either push ahead fixing all these issues or (partially) revert
> > this netback feature and try again for 3.16.
> I guess these problems apply to KVM as well, and it haven't caused them 
> problem so far, so I guess the problem shouldn't be that big. I assume 
> they are using this feature to send fragmented skbs out from a guest, 
> but I might be wrong.
> Anyway, I think I'll check tomorrow if there are further places to worry 
> about, but I don't think if there are any of them which are easily 
> reproducible.

OK, thanks. Assuming Eric's patch is acceptable for 3.15 it sounds like
that is the way to go.

Ian.

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