linux-kernel - Re: [PATCH v6 13/15] crypto: iaa - Add support for deflate-iaa-canned compression algorithm

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Message-ID: <ZIw/jtxdg6O1O0j3@gondor.apana.org.au>
Date:   Fri, 16 Jun 2023 18:55:10 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Tom Zanussi <tom.zanussi@...ux.intel.com>
Cc:     davem@...emloft.net, fenghua.yu@...el.com, vkoul@...nel.org,
        dave.jiang@...el.com, tony.luck@...el.com,
        wajdi.k.feghali@...el.com, james.guilford@...el.com,
        kanchana.p.sridhar@...el.com, vinodh.gopal@...el.com,
        giovanni.cabiddu@...el.com, linux-kernel@...r.kernel.org,
        linux-crypto@...r.kernel.org, dmaengine@...r.kernel.org
Subject: Re: [PATCH v6 13/15] crypto: iaa - Add support for
 deflate-iaa-canned compression algorithm

On Mon, Jun 05, 2023 at 03:15:34PM -0500, Tom Zanussi wrote:
> Add support for a 'canned' compression mode using the IAA compression
> mode in-kernel API.
> 
> The IAA 'canned' compression mode is added alongside the existing
> 'fixed' compression mode and a crypto algorithm named
> 'deflate-iaa-canned' is registered using it.

So you said that canned is not compatible with the generic deflate
algorithm.  Does that mean that there is no way for it to decompress
something compressed by the generic deflate algorithm, and vice versa
its compressed output cannot be decompressed by generic deflate?

We don't add an algorithm to the Crypto API if the only implementation
is by hardware.  IOW if you are adding a new algorithm, then a
software version must be the first patch.

Thanks,
-- 
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