linux-kernel - Re: [PATCH v4] core, nfqueue, openvswitch: Orphan frags in skb

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Date:	Wed, 26 Mar 2014 22:38:48 +0000
From:	Zoltan Kiss <zoltan.kiss@...rix.com>
To:	David Miller <davem@...emloft.net>
CC:	<jesse@...ira.com>, <pshelar@...ira.com>, <tgraf@...hat.com>,
	<dev@...nvswitch.org>, <pablo@...filter.org>,
	<kadlec@...ckhole.kfki.hu>, <edumazet@...gle.com>,
	<dborkman@...hat.com>, <therbert@...gle.com>,
	<jasowang@...hat.com>, <fw@...len.de>, <joe@...ches.com>,
	<horms@...ge.net.au>, <jiri@...nulli.us>, <mst@...hat.com>,
	<Paul.Durrant@...rix.com>, <JBeulich@...e.com>,
	<herbert@...dor.apana.org.au>, <mszeredi@...e.cz>,
	<netfilter-devel@...r.kernel.org>, <netfilter@...r.kernel.org>,
	<xen-devel@...ts.xenproject.org>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <kvm@...r.kernel.org>
Subject: Re: [PATCH v4] core, nfqueue, openvswitch: Orphan frags in skb_zerocopy
 and handle errors

On 26/03/14 20:12, David Miller wrote:
> From: David Miller <davem@...emloft.net>
> Date: Wed, 26 Mar 2014 15:59:58 -0400 (EDT)
>
>> From: Zoltan Kiss <zoltan.kiss@...rix.com>
>> Date: Fri, 21 Mar 2014 10:31:34 +0000
>>
>>> skb_zerocopy can copy elements of the frags array between skbs, but it doesn't
>>> orphan them. Also, it doesn't handle errors, so this patch takes care of that
>>> as well, and modify the callers accordingly. skb_tx_error() is also added to
>>> the callers so they will signal the failed delivery towards the creator of the
>>> skb.
>>>
>>> Signed-off-by: Zoltan Kiss <zoltan.kiss@...rix.com>
>>
>> Applied, thanks Zoltan.
>
> Actually, Zoltan, you have to fix this:
>
> net/core/skbuff.c: In function ‘skb_zerocopy’:
> net/core/skbuff.c:2172:2: warning: passing argument 1 of ‘skb_orphan_frags’ discards ‘const’ qualifi
> er from pointer target type [enabled by default]
> In file included from include/linux/tcp.h:21:0,
>                   from net/core/skbuff.c:50:
> include/linux/skbuff.h:1904:19: note: expected ‘struct sk_buff *’ but argument is of type ‘const str
> uct sk_buff *’
> net/core/skbuff.c:2173:3: warning: passing argument 1 of ‘skb_tx_error’ discards ‘const’ qualifier f
> rom pointer target type [enabled by default]
> net/core/skbuff.c:642:6: note: expected ‘struct sk_buff *’ but argument is of type ‘const struct sk_
> buff *’
>

Ok, resubmitted. 'from' is now not a const parameter, because 
skb->pfmemalloc might change.

Zoli
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