netdev - Re: [PATCH 05/20] netfilter: nft_hash: add support for timeouts

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Date:	Sat, 11 Apr 2015 15:40:55 +0200
From:	Pablo Neira Ayuso <pablo@...filter.org>
To:	David Laight <David.Laight@...LAB.COM>
Cc:	kaber@...sh.net,
	"netfilter-devel@...r.kernel.org" <netfilter-devel@...r.kernel.org>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH 05/20] netfilter: nft_hash: add support for timeouts

On Thu, Apr 09, 2015 at 01:39:18PM +0000, David Laight wrote:
> From: Pablo Neira Ayuso
> > Sent: 09 April 2015 12:35
> ...
> > Add support for element timeouts to nft_hash. The lookup and walking
> > functions are changed to ignore timed out elements, a periodic garbage
> > collection task cleans out expired entries.
> 
> You probably want to delete timed out entries during insert.
> If you do that you don't really need a garbage collector.

Exploring a synchronous solution from the Netlink API sounds like an
interesting idea to me.

> I'd also worry about re-adding a timed out entry.

It seems we re-add it as a new entry.
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