linux-kernel - Re: [PATCH v2] core, nfqueue, openvswitch: Orphan frags in skb

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Message-ID: <532AE010.9050903@redhat.com>
Date:	Thu, 20 Mar 2014 13:33:20 +0100
From:	Thomas Graf <tgraf@...hat.com>
To:	Zoltan Kiss <zoltan.kiss@...rix.com>,
	Jesse Gross <jesse@...ira.com>, pshelar@...ira.com,
	dev@...nvswitch.org
CC:	"David S. Miller" <davem@...emloft.net>,
	Pablo Neira Ayuso <pablo@...filter.org>,
	Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
	Eric Dumazet <edumazet@...gle.com>,
	Daniel Borkmann <dborkman@...hat.com>,
	Tom Herbert <therbert@...gle.com>,
	Jason Wang <jasowang@...hat.com>,
	Florian Westphal <fw@...len.de>, Joe Perches <joe@...ches.com>,
	Simon Horman <horms@...ge.net.au>,
	Jiri Pirko <jiri@...nulli.us>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Paul Durrant <Paul.Durrant@...rix.com>,
	Jan Beulich <JBeulich@...e.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Miklos Szeredi <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 v2] core, nfqueue, openvswitch: Orphan frags in skb_zerocopy
 and handle errors

On 03/20/2014 01:16 PM, Thomas Graf wrote:
> On 03/19/2014 10:07 PM, Zoltan Kiss wrote:
>> 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.
>>
>> Signed-off-by: Zoltan Kiss <zoltan.kiss@...rix.com>
>
> Acked-by: Thomas Graf <tgraf@...hat.com>

I take this back ;)

>> ---
>> +    if (unlikely(skb_orphan_frags(to, GFP_ATOMIC))) {
>> +        skb_tx_error(to);
>> +        return -ENOMEM;
>> +    }

Just noticed that you orphan the Netlink skb frags which do not
exist yet instead of the source skb frags.

> Did you consider calling skb_tx_error() for Netlink message
> allocation failures for the upcall as well? That memory pressure
> is currently not reported back.

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