netdev - Re: [PATCH 9/9] netfilter: nf_tables: add support for dynamic set updates

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Message-ID: <20150130101802.GA19073@gondor.apana.org.au>
Date:	Fri, 30 Jan 2015 21:18:02 +1100
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	tgraf@...g.ch, davem@...emloft.net, David.Laight@...LAB.COM,
	ying.xue@...driver.com, paulmck@...ux.vnet.ibm.com,
	netdev@...r.kernel.org, netfilter-devel@...r.kernel.org
Subject: Re: [PATCH 9/9] netfilter: nf_tables: add support for dynamic set
 updates

On Fri, Jan 30, 2015 at 10:08:46AM +0000, Patrick McHardy wrote:
> Am 30. Januar 2015 09:28:45 GMT+00:00, schrieb Herbert Xu <herbert@...dor.apana.org.au>:
> >On Fri, Jan 30, 2015 at 07:46:34AM +0000, Patrick McHardy wrote:
> >> Signed-off-by: Patrick McHardy <kaber@...sh.net>
> >
> >I presume this can't create any jumps/gotos, right?
> 
> So far not, just data mappings. Not sure yet if there is a valid use case for jumps.

Well if they could create jumps/gotos in softirq context then
the loop verification would get pretty hairy :)

OK so it looks like you really do need a totally lockless walk.
So I'll reshape my iterators to do that.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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