Received-SPF: pass (google.com: best guess record for domain of linux-crypto-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Fri, 27 Sep 2019 14:59:04 +1000
From:   Herbert Xu <herbert@gondor.apana.org.au>
To:     Andy Lutomirski <luto@kernel.org>
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>,
        Will Deacon <will@kernel.org>, Marc Zyngier <maz@kernel.org>,
        Catalin Marinas <catalin.marinas@arm.com>
Subject: Re: [RFC PATCH 18/18] net: wireguard - switch to crypto API for
 packet encryption
Message-ID: <20190927045904.GA28580@gondor.apana.org.au>
References: <20190925161255.1871-1-ard.biesheuvel@linaro.org>
 <20190925161255.1871-19-ard.biesheuvel@linaro.org>
 <CAHk-=wjYsbxSiV_XKWV3BwGvau_hUvQiQHLOoc7vLUZt0Wqzfw@mail.gmail.com>
 <CH2PR20MB29680F87B32BBF0495720172CA860@CH2PR20MB2968.namprd20.prod.outlook.com>
 <CAHk-=wgR_KsYw2GmZwkG3GmtX6nbyj0LEi7rSqC+uFi3ScTYcw@mail.gmail.com>
 <MN2PR20MB297317D9870A3B93B5E506C9CA810@MN2PR20MB2973.namprd20.prod.outlook.com>
 <CAHk-=wjr1w7x9Rjre_ALnDLASYNjsEHxu6VJpk4eUwZXN0ntqw@mail.gmail.com>
 <CAHk-=whqWh8ebZ7ryEv5tKKtO5VpOj2rWVy7wV+aHWGO7m9gAw@mail.gmail.com>
 <20190927035319.GA23566@gondor.apana.org.au>
 <CALCETrW28rDxLs+UOO+k5gfHJZHzy_xra-e0f6kBp6YdeWA36A@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <CALCETrW28rDxLs+UOO+k5gfHJZHzy_xra-e0f6kBp6YdeWA36A@mail.gmail.com>
User-Agent: Mutt/1.10.1 (2018-07-13)
Sender: linux-crypto-owner@vger.kernel.org
Precedence: bulk

On Thu, Sep 26, 2019 at 09:37:16PM -0700, Andy Lutomirski wrote:
>
> Then what's up with the insistence on using physical addresses for so
> many of the buffers?

This happens to be what async hardware wants, but the main reason
why the crypto API has them is because that's what the network
stack feeds us.  The crypto API was first created purely for IPsec
so the SG lists are intimiately tied with how skbs were constructed.

Cheers,
-- 
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt