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

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Message-ID: <5373B974.6050808@citrix.com>
Date:	Wed, 14 May 2014 19:44:04 +0100
From:	Zoltan Kiss <zoltan.kiss@...rix.com>
To:	Ian Campbell <Ian.Campbell@...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 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.

Zoli
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