linux-kernel - Re: [PATCH] crypto: compress

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Date:	Tue, 10 Feb 2009 17:18:22 +1100
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
Cc:	linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] crypto: compress - Add pcomp interface

On Thu, Feb 05, 2009 at 05:24:51PM +0100, Geert Uytterhoeven wrote:
>
> > Well with the netlink parameters these can have variable lengths
> > depending on how many parameters the user supplies.
> 
> How can this be exported to userspace?
> How does this variable length parameter passing work? Do you have an example?

See how we use it for rtnetlink, e.g., in net/ipv4/ip_gre.c.

> Nothing in crypto/ seems to already use nla_*?

Well we don't have a user-space API yet :) But checkout the
discussions on this list.

> While the core of the crypto system supports two algorithms of the same name
> with different types, the testmgr doesn't.

I was lazy :) But really it isn't too hard to add a type field to
the array in testmgr.  We don't even have to add it for existing
entries (except for the ones that you're trying to replace, i.e.,
deflate).

> As I removed the backwards-compatility layer at your request, I'll use "zlib"
> for the name of the new module. It's more flexible than the fixed "deflate"
> one anyway.
> 
> Is this OK for you?

Hmm, I think we need to have it stay as deflate if we're to make
an easy transition for existing users (e.g., IPsec).

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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