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From: Herbert Xu <herbert@gondor.apana.org.au>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: "David S. Miller" <davem@davemloft.net>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Linux Crypto Mailing List <linux-crypto@vger.kernel.org>
Subject: Re: Crypto Update for 2.6.38
Date: Fri, 7 Jan 2011 08:39:32 +1100
Message-ID: <20110106213932.GA26538@gondor.apana.org.au> (raw)
In-Reply-To: <AANLkTimwaJCUxvMLoeS5Cpmu7FX3y=coeSdkPrrL4zcr@mail.gmail.com>

On Thu, Jan 06, 2011 at 01:23:19PM -0800, Linus Torvalds wrote:
>
> Explanations of interface. Code. Who uses it? What are the actual
> performance benefits on real code?

You snipped out the bit in my reply where I expanded on it:

: Right.  This purpose of this interface is to access the async
: hardware crypto drivers that we have added over the past years.
:
: For a modern x86-64 CPU it isn't interesting at all.  It's mainly
: for other architectures where the CPU may not be able to keep up
: with say 10Gb/s IPsec traffic and the encryption and/or hashing
: must be offloaded.
:
: This is also why only hash and skcipher are supported as they
: are the main algorithm types supported by teh current async
: drivers in the kernel.

The interface is meant to be used by those whose CPU either cannot
provide adequate performance for encryption/hashing, or where they
need to preverse the CPU power for other tasks.  This is most
likely to be used on a non-x86 architecture, as most of our async
crypto drivers are for non-x86 architectures.

Users can be anything performing bulk encryptiong/hashing in user-
space, e.g., SSL (although there are plans to implement SSL in
the kernel as well), SSH, etc.

Here is the original cover email for the patches:

: On Tue, Sep 07, 2010 at 04:42:13PM +0800, Herbert Xu wrote:
: > 
: > This is what I am proposing for the Crypto API user-interface.
: > 
: > Note that this is the interface for operations.  There will be
: > a separate interface (most likely netlink) for configuring crypto
: > algorithms, e.g., picking a specific AES implementation as the
: > system default.
:
: OK I've gone ahead and implemented the user-space API for hashes
: and ciphers.
:
: To recap this interface is designed to allow user-space programs
: to access hardware cryptographic accelerators that we have added
: to the kernel.
:
: The intended usage scenario is where a large amount of data needs
: to be processed where the benefits offered by hardware acceleration
: that is normally unavailable in user-space (as opposed to ones
: such as the Intel AES instruction which may be used directly from
: user-space) outweigh the overhead of going through the kernel.
:
: In order to further minimise the overhead in these cases, this
: interface offers the option of avoiding copying data between
: user-space and the kernel where possible and appropriate.  For
: ciphers this means the use of the splice(2) interface instead of
: sendmsg(2)
:
: Here is a sample hash program (note that these only illustrate
: what the interface looks like and are not meant to be good examples
: of coding :)
:
: int main(void)
: {
: 	int opfd;
: 	int tfmfd;
: 	struct sockaddr_alg sa = {
: 		.salg_family = AF_ALG,
: 		.salg_type = "hash",
: 		.salg_name = "sha1"
: 	};
: 	char buf[20];
: 	int i;
:
: 	tfmfd = socket(AF_ALG, SOCK_SEQPACKET, 0);
:
: 	bind(tfmfd, (struct sockaddr *)&sa, sizeof(sa));
:
: 	opfd = accept(tfmfd, NULL, 0);
:
: 	write(opfd, "abc", 3);
: 	read(opfd, buf, 20);
:
: 	for (i = 0; i < 20; i++) {
: 		printf("%02x", (unsigned char)buf[i]);
: 	}
: 	printf("\n");
:
: 	close(opfd);
: 	close(tfmfd);
:
: 	return 0;
: }
:
: And here is one for ciphers:
:
: int main(void)
: {
: 	int opfd;
: 	int tfmfd;
: 	struct sockaddr_alg sa = {
: 		.salg_family = AF_ALG,
: 		.salg_type = "skcipher",
: 		.salg_name = "cbc(aes)"
: 	};
: 	struct msghdr msg = {};
: 	struct cmsghdr *cmsg;
: 	char cbuf[CMSG_SPACE(4) + CMSG_SPACE(20)];
: 	char buf[16];
: 	struct af_alg_iv *iv;
: 	struct iovec iov;
: 	int i;
:
: 	tfmfd = socket(AF_ALG, SOCK_SEQPACKET, 0);
:
: 	bind(tfmfd, (struct sockaddr *)&sa, sizeof(sa));
:
: 	setsockopt(tfmfd, SOL_ALG, ALG_SET_KEY,
: 		   "\x06\xa9\x21\x40\x36\xb8\xa1\x5b"
: 		   "\x51\x2e\x03\xd5\x34\x12\x00\x06", 16);
:
: 	opfd = accept(tfmfd, NULL, 0);
:
: 	msg.msg_control = cbuf;
: 	msg.msg_controllen = sizeof(cbuf);
:
: 	cmsg = CMSG_FIRSTHDR(&msg);
: 	cmsg->cmsg_level = SOL_ALG;
: 	cmsg->cmsg_type = ALG_SET_OP;
: 	cmsg->cmsg_len = CMSG_LEN(4);
: 	*(__u32 *)CMSG_DATA(cmsg) = ALG_OP_ENCRYPT;
:
: 	cmsg = CMSG_NXTHDR(&msg, cmsg);
: 	cmsg->cmsg_level = SOL_ALG;
: 	cmsg->cmsg_type = ALG_SET_IV;
: 	cmsg->cmsg_len = CMSG_LEN(20);
: 	iv = (void *)CMSG_DATA(cmsg);
: 	iv->ivlen = 16;
: 	memcpy(iv->iv, "\x3d\xaf\xba\x42\x9d\x9e\xb4\x30"
: 		       "\xb4\x22\xda\x80\x2c\x9f\xac\x41", 16);
:
: 	iov.iov_base = "Single block msg";
: 	iov.iov_len = 16;
:
: 	msg.msg_iov = &iov;
: 	msg.msg_iovlen = 1;
:
: 	sendmsg(opfd, &msg, 0);
: 	read(opfd, buf, 16);
:
: 	for (i = 0; i < 16; i++) {
: 		printf("%02x", (unsigned char)buf[i]);
: 	}
: 	printf("\n");
:
: 	close(opfd);
: 	close(tfmfd);
:
: 	return 0;
: }

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

  reply index

Thread overview: 246+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-12-25  0:17 Crypto Update for 2.6.29 Herbert Xu
2008-12-25  0:20 ` Herbert Xu
2009-03-24  4:49   ` Crypto Update for 2.6.30 Herbert Xu
     [not found]   ` <20090324044932.GA18245@gondor.apana.org.au>
2009-04-02  6:14     ` Herbert Xu
2009-05-17 22:28       ` Herbert Xu
2009-05-31 13:12         ` Herbert Xu
2009-06-13  2:05     ` Crypto Update for 2.6.31 Herbert Xu
2009-06-21 14:09       ` Crypto Fixes " Herbert Xu
2009-09-02 22:03         ` Herbert Xu
2009-09-10 14:19       ` Crypto Update for 2.6.32 Herbert Xu
     [not found]       ` <20090910141905.GA17948@gondor.apana.org.au>
2009-10-20  6:54         ` Crypto Fixes " Herbert Xu
2009-10-20  7:26           ` Herbert Xu
2009-11-23 12:05             ` Herbert Xu
2009-12-30  2:12           ` Crypto Fixes for 2.6.33 Herbert Xu
2010-02-01 19:52             ` Herbert Xu
     [not found]             ` <20100201195204.GA6953@gondor.apana.org.au>
2010-03-05  7:10               ` Crypto Fixes for 2.6.34 Herbert Xu
     [not found]               ` <20100305071043.GA3548@gondor.apana.org.au>
2010-04-27 13:55                 ` Herbert Xu
2010-06-03 10:05                   ` Crypto Fixes for 2.6.35 Herbert Xu
2010-06-03 16:26                     ` Linus Torvalds
2010-06-03 21:56                       ` Herbert Xu
2010-07-16  2:26                     ` Herbert Xu
2010-07-22  5:50                       ` Herbert Xu
2010-07-23  5:17                         ` Lee Nipper
2010-07-23  7:27                           ` Herbert Xu
2010-07-23 13:17                             ` Lee Nipper
2010-09-03  6:00                         ` Herbert Xu
2010-09-03 11:07                           ` Crypto Fixes for 2.6.36 Herbert Xu
2010-12-15 11:50                             ` Crypto Fixes for 2.6.37 Herbert Xu
2010-12-15 20:40                               ` Linus Torvalds
2010-12-16  0:49                                 ` Herbert Xu
2010-12-16  0:58                                   ` Herbert Xu
2011-02-16  5:39                               ` Crypto Fixes for 2.6.38 Herbert Xu
     [not found]                               ` <20110216053911.GA10999@gondor.apana.org.au>
2011-03-28  7:13                                 ` Crypto Fixes for 2.6.39 Herbert Xu
2011-06-29 23:51                                   ` Crypto Fixes for 3.0 Herbert Xu
2011-10-21  8:22                                     ` Crypto Fixes for 3.1 Herbert Xu
2011-10-21  9:41                                       ` David Rientjes
2011-10-21 11:35                                         ` Herbert Xu
2011-11-10 23:00                                       ` Crypto Fixes for 3.2 Herbert Xu
2011-11-26  2:34                                         ` Herbert Xu
2012-01-26  2:43                                     ` Crypto Fixes for 3.3 Herbert Xu
2012-01-26  3:35                                       ` Linus Torvalds
2012-01-26  4:07                                         ` Herbert Xu
2012-01-26  4:16                                           ` Linus Torvalds
2012-02-14  3:35                                       ` Herbert Xu
2012-02-16  5:32                                         ` Herbert Xu
2012-03-03  5:36                                           ` Herbert Xu
2012-03-22  1:20                                       ` Crypto Fixes for 3.4 Herbert Xu
2012-04-02  9:45                                         ` Herbert Xu
2012-04-20 14:16                                           ` Herbert Xu
2012-06-11 13:00                                         ` Crypto Fixes for 3.5 Herbert Xu
2012-06-18  8:24                                           ` Herbert Xu
2012-08-23  8:32                                       ` Crypto Fixes for 3.6 Herbert Xu
2012-09-11  4:10                                         ` Herbert Xu
2012-11-09  9:30                                         ` Crypto Fixes for 3.7 Herbert Xu
2013-03-28  8:28                                           ` Crypto Fixes for 3.9 Herbert Xu
2013-03-28 13:05                                             ` Chaoxing Lin
2013-03-28 13:52                                               ` Herbert Xu
2013-04-10  2:21                                             ` Herbert Xu
2013-04-22  0:34                                               ` Herbert Xu
2013-05-28  5:52                                             ` Crypto Fixes for 3.10 Herbert Xu
2013-06-10  9:05                                               ` Herbert Xu
2013-06-20 13:29                                                 ` Herbert Xu
2013-06-27 13:02                                                   ` Herbert Xu
2013-07-24  7:23                                             ` Crypto Fixes for 3.11 Herbert Xu
2013-09-13 11:30                                             ` Crypto Fixes for 3.12 Herbert Xu
2013-09-13 14:22                                               ` Linus Torvalds
2013-09-13 14:39                                                 ` Herbert Xu
2013-12-03 12:41                                             ` Crypto Fixes for 3.13 Herbert Xu
2013-12-09 11:57                                               ` Herbert Xu
2014-01-01  6:10                                                 ` Herbert Xu
2014-02-03 12:59                                                   ` Crypto Fixes for 3.14 Herbert Xu
2014-04-13 23:34                                                     ` Crypto Fixes for 3.15 Herbert Xu
2014-05-13 11:02                                                       ` Herbert Xu
2014-05-21 12:22                                                         ` Herbert Xu
2014-07-10  9:03                                                     ` Crypto Fixes for 3.16 Herbert Xu
2014-07-18 10:57                                                       ` Herbert Xu
2014-07-28 14:05                                                         ` Herbert Xu
2014-07-31 13:59                                                           ` Herbert Xu
2014-09-15 11:35                                                       ` Crypto Fixes for 3.17 Herbert Xu
2014-09-24 13:27                                                         ` Herbert Xu
2014-11-10  8:57                                                           ` Crypto Fixes for 3.18 Herbert Xu
2014-12-31  3:32                                                     ` Crypto Fixes for 3.19 Herbert Xu
2015-01-07  2:17                                                       ` Herbert Xu
2015-01-20  0:52                                                         ` Herbert Xu
2015-03-09  5:19                                                         ` Crypto Fixes for 4.0 Herbert Xu
2015-03-18  5:25                                                           ` Herbert Xu
2015-03-18 18:12                                                             ` Linus Torvalds
2015-04-25  8:03                                                         ` Crypto Fixes for 4.1 Herbert Xu
2015-05-05 10:06                                                           ` Herbert Xu
2015-05-11  5:56                                                             ` Herbert Xu
2015-05-20  6:54                                                               ` Herbert Xu
2015-05-22  4:05                                                                 ` Herbert Xu
2015-05-22 21:29                                                                   ` Linus Torvalds
2015-05-22 21:39                                                                     ` Herbert Xu
2015-05-26  8:43                                                                   ` Herbert Xu
2015-06-18  3:43                                                                     ` Herbert Xu
2010-09-04 10:45                           ` Crypto Fixes for 2.6.35 Chuck Ebbert
2010-09-04 12:22                             ` Herbert Xu
2010-11-13 12:59               ` Crypto Fixes for 2.6.37 Herbert Xu
2009-12-04 13:55     ` Crypto Update for 2.6.33 Herbert Xu
2010-02-26  0:49       ` Crypto Update for 2.6.34 Herbert Xu
2010-03-01  7:50         ` tip: origin tree boot crash Ingo Molnar
2010-03-01 14:55           ` Steffen Klassert
2010-03-03 14:42             ` Herbert Xu
2010-03-04  3:00               ` Ingo Molnar
2010-03-04  5:31                 ` Herbert Xu
2010-05-19  2:06         ` Crypto Update for 2.6.35 Herbert Xu
2010-05-21 10:44           ` Herbert Xu
2010-08-04 14:04             ` Crypto Update for 2.6.36 Herbert Xu
2010-10-24  6:16               ` Crypto Update for 2.6.37 Herbert Xu
     [not found]               ` <20101024061625.GA23715@gondor.apana.org.au>
2011-01-06  0:01                 ` Crypto Update for 2.6.38 Herbert Xu
2011-01-06 18:05                   ` Linus Torvalds
2011-01-06 21:16                     ` Herbert Xu
2011-01-06 21:23                       ` Linus Torvalds
2011-01-06 21:39                         ` Herbert Xu [this message]
2011-01-06 22:13                           ` Linus Torvalds
2011-01-06 22:30                             ` Herbert Xu
2011-01-06 22:33                               ` David Miller
2011-01-06 22:43                               ` Linus Torvalds
2011-01-06 22:53                                 ` Herbert Xu
2011-01-06 23:25                                   ` Linus Torvalds
2011-01-07  0:14                                     ` Herbert Xu
2011-01-07  2:43                                       ` David Miller
2011-01-07  3:04                                         ` Herbert Xu
2011-01-07  2:39                                   ` Pavel Roskin
2011-01-07  3:03                                     ` Herbert Xu
2011-01-07 12:04                             ` Neil Horman
2011-01-08 13:23                               ` Nikos Mavrogiannopoulos
2011-01-10 12:03                                 ` Neil Horman
2011-01-10 19:05                                   ` Dag Arne Osvik
2011-01-06 21:46                       ` Pavel Roskin
2011-01-06 21:49                         ` Herbert Xu
2011-01-06 23:02                         ` Mihai Donțu
2011-01-13  1:44                   ` Herbert Xu
2011-03-15 14:59                   ` Crypto Update for 2.6.39 Herbert Xu
2011-05-20 23:54                     ` Crypto Update for 2.6.40 Herbert Xu
2011-07-24  1:17                       ` Crypto Update for 3.1 Herbert Xu
2011-10-31  4:09                         ` Crypto Update for 3.2 Herbert Xu
2011-10-31 16:42                           ` Randy Dunlap
2011-10-31 17:16                             ` Linus Torvalds
2011-11-01  3:48                               ` Herbert Xu
2012-01-06  4:12                           ` Crypto Update for 3.3 Herbert Xu
2012-01-11 22:19                             ` Herbert Xu
2012-03-20  3:27                             ` Herbert Xu
2012-05-23  1:35                               ` Crypto Update for 3.5 Herbert Xu
2012-05-23 23:06                                 ` Linus Torvalds
2012-05-24  0:21                                   ` Herbert Xu
2012-05-24  8:36                                     ` Arnd Bergmann
2012-05-24  7:03                                   ` Linus Walleij
2012-07-25  8:41                                 ` Crypto Update for 3.6 Herbert Xu
2012-10-04  9:53                             ` Crypto Update for 3.7 Herbert Xu
2012-12-14 10:31                               ` Crypto Update for 3.8 Herbert Xu
2013-02-23  2:33                                 ` Crypto Update for 3.9 Herbert Xu
2013-05-02  1:47                                   ` Crypto Update for 3.10 Herbert Xu
2013-07-05  9:52                                     ` Crypto Update for 3.11 Herbert Xu
2013-09-07  3:55                                   ` Crypto Update for 3.12 Herbert Xu
2013-11-07  8:01                                     ` Crypto Update for 3.13 Herbert Xu
2013-11-12 16:41                                       ` Herbert Xu
2013-11-12 16:59                                         ` Borislav Petkov
2013-11-12 18:27                                           ` Herbert Xu
2013-11-19  2:21                                         ` [GIT] " Herbert Xu
2013-11-23  1:34                                         ` Herbert Xu
2013-11-23  1:40                                           ` Herbert Xu
2014-01-23 11:53                                       ` Crypto Update for 3.14 Herbert Xu
2014-04-01 10:00                                         ` Crypto Update for 3.15 Herbert Xu
2014-06-05  6:23                                           ` Crypto Update for 3.16 Herbert Xu
2014-06-08  2:56                                             ` Linus Torvalds
2014-06-08  4:55                                               ` Herbert Xu
2014-06-09  1:47                                               ` Steven Miao
2014-08-04 13:03                                             ` Crypto Update for 3.17 Herbert Xu
2014-10-07 13:18                                               ` Crypto Update for 3.18 Herbert Xu
2014-12-11 12:51                                                 ` Crypto Update for 3.19 Herbert Xu
2014-12-12 11:54                                                   ` Herbert Xu
2015-02-14  9:43                                                   ` Crypto Update for 3.20 Herbert Xu
2015-04-15  3:39                                                     ` Crypto Update for 4.1 Herbert Xu
2015-04-16  1:58                                                       ` Linus Torvalds
2015-04-16  2:37                                                         ` Linus Torvalds
2015-04-16  2:38                                                           ` Linus Torvalds
2015-04-16  2:42                                                             ` Herbert Xu
2015-04-16  2:49                                                               ` Linus Torvalds
2015-04-16  3:07                                                                 ` Herbert Xu
2015-04-16  3:34                                                                   ` Linus Torvalds
2015-04-23 19:27                                                                     ` Bobby Powers
2015-04-23 20:10                                                                       ` Ard Biesheuvel
2015-04-23 21:35                                                                         ` Bobby Powers
2015-04-24  6:37                                                                           ` [PATCH] crypto: x86/sha512_ssse3 - fixup for asm function prototype change Ard Biesheuvel
2015-04-24 12:20                                                                             ` Herbert Xu
2015-06-22  8:44                                                       ` Crypto Update for 4.2 Herbert Xu
2015-06-23  4:26                                                         ` Linus Torvalds
2015-06-23  4:32                                                           ` Herbert Xu
2015-06-24  2:11                                                         ` Linus Torvalds
2015-06-24 13:29                                                           ` Herbert Xu
2015-08-31 13:56                                                         ` Crypto Update for 4.3 Herbert Xu
2015-11-02  8:04                                                           ` Crypto Update for 4.4 Herbert Xu
2016-01-11 10:14                                                             ` Crypto Update for 4.5 Herbert Xu
2016-01-22 10:18                                                               ` Crypto Fixes " Herbert Xu
2016-02-01  8:31                                                                 ` Herbert Xu
2016-02-09 17:54                                                                 ` Herbert Xu
2016-03-23 13:09                                                                 ` Crypto Fixes for 4.6 Herbert Xu
2016-03-30  9:11                                                                 ` Herbert Xu
2016-04-14  6:25                                                                   ` Herbert Xu
2016-04-25 11:12                                                                     ` Herbert Xu
2016-04-20  9:49                                                                   ` Herbert Xu
2016-05-09  8:46                                                                   ` Herbert Xu
2016-05-13  5:59                                                                 ` Herbert Xu
2016-05-20  8:41                                                                   ` Crypto Fixes for 4.7 Herbert Xu
2016-05-30  6:31                                                                     ` Herbert Xu
2016-06-27  6:28                                                                     ` Herbert Xu
2016-08-16  8:48                                                                       ` Crypto Fixes for 4.8 Herbert Xu
2016-07-22  3:39                                                                     ` Crypto Fixes for 4.7 Herbert Xu
2016-07-23  3:10                                                                       ` Herbert Xu
2016-08-01  9:58                                                                 ` Crypto Fixes for 4.8 Herbert Xu
2016-08-23  9:51                                                                   ` Herbert Xu
2016-08-31 14:19                                                                     ` Herbert Xu
2016-09-05  9:33                                                                   ` Herbert Xu
2016-09-13 10:35                                                                     ` Herbert Xu
2016-09-19 11:21                                                                     ` Herbert Xu
2016-09-23 14:48                                                                     ` Herbert Xu
2016-10-25  2:34                                                                   ` Crypto Fixes for 4.9 Herbert Xu
2016-03-15  7:20                                                               ` Crypto Update for 4.6 Herbert Xu
2016-05-16  7:16                                                                 ` Crypto Update for 4.7 Herbert Xu
2016-07-25 10:53                                                                   ` Crypto Update for 4.8 Herbert Xu
2016-10-10  3:34                                                                     ` Crypto Update for 4.9 Herbert Xu
2015-06-26 10:22                                                     ` Crypto Fixes for 4.2 Herbert Xu
2015-06-26 20:07                                                       ` Linus Torvalds
2015-06-27  6:56                                                         ` Herbert Xu
2015-06-27 16:40                                                           ` Linus Torvalds
2015-06-29  7:32                                                             ` Herbert Xu
2015-06-30 13:51                                                       ` Herbert Xu
2015-07-13  4:08                                                         ` Herbert Xu
2015-08-03  7:16                                                           ` Herbert Xu
2015-08-17  8:27                                                             ` Herbert Xu
2015-09-08  9:25                                                       ` Crypto Fixes for 4.3 Herbert Xu
2015-09-16 10:30                                                         ` Herbert Xu
2015-09-26 20:01                                                           ` Herbert Xu
2015-10-13 12:17                                                             ` Herbert Xu
2015-10-13 17:23                                                               ` Linus Torvalds
2015-10-14  1:03                                                                 ` Herbert Xu
2015-10-14  2:00                                                                   ` Linus Torvalds
2015-10-14  2:38                                                                     ` Herbert Xu
2015-10-26 11:02                                                         ` Herbert Xu
2015-11-11  7:08                                                           ` Crypto Fixes for 4.4 Herbert Xu
2015-11-17  9:41                                                             ` Herbert Xu
2015-12-05  1:04                                                             ` Herbert Xu
2015-12-14  9:29                                                               ` Herbert Xu
2015-12-28 13:26                                                             ` Herbert Xu

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