netdev - Re: [PATCHv4 net-next-2.6 1/5] XFRM,IPv6: Remove xfrm_spi

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Message-ID: <20101005041707.GA26458@gondor.apana.org.au>
Date:	Tue, 5 Oct 2010 12:17:07 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Arnaud Ebalard <arno@...isbad.org>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	netdev@...r.kernel.org
Subject: Re: [PATCHv4 net-next-2.6 1/5] XFRM,IPv6: Remove xfrm_spi_hash()
	dependency on destination address

On Tue, Oct 05, 2010 at 10:11:14AM +0800, Herbert Xu wrote:
>
> I'm thinking about the case where each remote end (or one remote
> end with many IP addresses) chooses to use a single SPI which then
> all gets hashed to the same bucket.
> 
> Outbound SAs are hashed into the same SPI hash table as inbound SAs.

Another solution would be to create a hash table for inbound SAs
only.  Unfortunately I don't think we have anything in our current
user-interface to indicate whether an SA is inbound or outbound.

So to do this you'll need to use a heuristic such as doing a
lookup on the source/destination address at insertion time.

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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