Re: [PATCH v2 0/4] crypto: aesni - Use zero-copy for gcm(aes) buffers that are partially contiguous

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On Wed, Jan 31, 2018 at 10:54:57AM -0800, Junaid Shahid wrote:
> On Wed, Jan 31, 2018 at 12:13 AM, Steffen Klassert
> <steffen.klassert@xxxxxxxxxxx> wrote:
> >
> > I wonder which special usecase you have in mind that will be improved
> > by your patches.
> >
> 
> This is not related to IPsec. We have an internal use case where the
> data buffer itself is a single memory page but the authentication tag
> needs to be in a separate buffer. This patch set allows us to have
> zero copy in that case.

We usually don't add code for 'internal use cases' to the mainline
kernel. If you need a SG version of gcm-aesni, then please implement
the generic version so that everybody can benefit from it.

Think about how this will look like if everybody would add
a workaround for its very special use case.




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