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From:   Andy Lutomirski <luto@kernel.org>
Date:   Thu, 26 Sep 2019 21:37:16 -0700
Message-ID: <CALCETrW28rDxLs+UOO+k5gfHJZHzy_xra-e0f6kBp6YdeWA36A@mail.gmail.com>
Subject: Re: [RFC PATCH 18/18] net: wireguard - switch to crypto API for
 packet encryption
To:     Herbert Xu <herbert@gondor.apana.org.au>
Cc:     Linus Torvalds <torvalds@linux-foundation.org>,
        Pascal Van Leeuwen <pvanleeuwen@verimatrix.com>,
        Ard Biesheuvel <ard.biesheuvel@linaro.org>,
        Linux Crypto Mailing List <linux-crypto@vger.kernel.org>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
        David Miller <davem@davemloft.net>,
        Greg KH <gregkh@linuxfoundation.org>,
        "Jason A . Donenfeld" <Jason@zx2c4.com>,
        Samuel Neves <sneves@dei.uc.pt>,
        Dan Carpenter <dan.carpenter@oracle.com>,
        Arnd Bergmann <arnd@arndb.de>,
        Eric Biggers <ebiggers@google.com>,
        Andy Lutomirski <luto@kernel.org>,
        Will Deacon <will@kernel.org>, Marc Zyngier <maz@kernel.org>,
        Catalin Marinas <catalin.marinas@arm.com>
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On Thu, Sep 26, 2019 at 8:54 PM Herbert Xu <herbert@gondor.apana.org.au> wrote:
>
> On Thu, Sep 26, 2019 at 07:54:03PM -0700, Linus Torvalds wrote:
> >
> > Side note: almost nobody does this.
> >
> > Almost every single async interface I've ever seen ends up being "only
> > designed for async".
> >
> > And I think the reason is that everybody first does the simply
> > synchronous interfaces, and people start using those, and a lot of
> > people are perfectly happy with them. They are simple, and they work
> > fine for the huge majority of users.
>
> The crypto API is not the way it is because of async.  In fact, the
> crypto API started out as sync only and async was essentially
> bolted on top with minimial changes.

Then what's up with the insistence on using physical addresses for so
many of the buffers?

--Andy