linux-kernel - Re: [PATCH v2 1/5] crypto: Multi-buffer encryptioin infrastructure support

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Message-ID: <20151118050645.GA15327@gondor.apana.org.au>
Date:	Wed, 18 Nov 2015 13:06:45 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Tim Chen <tim.c.chen@...ux.intel.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	"David S.Miller" <davem@...emloft.net>,
	Stephan Mueller <smueller@...onox.de>,
	Chandramouli Narayanan <mouli_7982@...oo.com>,
	Vinodh Gopal <vinodh.gopal@...el.com>,
	James Guilford <james.guilford@...el.com>,
	Wajdi Feghali <wajdi.k.feghali@...el.com>,
	Jussi Kivilinna <jussi.kivilinna@....fi>,
	linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/5] crypto: Multi-buffer encryptioin infrastructure
 support

On Tue, Nov 17, 2015 at 04:30:14PM -0800, Tim Chen wrote:
> On Wed, 2015-11-18 at 08:07 +0800, Herbert Xu wrote:
> > On Tue, Nov 17, 2015 at 02:59:29PM -0800, Tim Chen wrote:
> > >
> > > Herbert, would you prefer me to use ablkcipher scatter walk instead,
> > > assuming the overhead of both walk are about the same?
> > 
> > Well since you are going to potentially sleep in the middle of
> > an operation I'd think ablkcipher is required, no?
> 
> We're using blkcipher walk in the implementation. 
> As long as we use kmap and instead of kmap_atomic,
> it allows us to sleep in the middle of the walk.

What if you were called from an atomic context, such as IPsec?

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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