LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Jeff Garzik <jeff@garzik.org>
To: Dan Williams <dan.j.williams@gmail.com>
Cc: Roland Dreier <rdreier@cisco.com>,
	neilb@suse.de, linux-raid@vger.kernel.org, akpm@osdl.org,
	linux-kernel@vger.kernel.org, christopher.leech@intel.com,
	Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Subject: Re: [PATCH 08/19] dmaengine: enable multiple clients and operations
Date: Wed, 13 Sep 2006 00:04:10 -0400	[thread overview]
Message-ID: <4507833A.30504@garzik.org> (raw)
In-Reply-To: <e9c3a7c20609112318o7febe296he6162ddd494499fd@mail.gmail.com>

Dan Williams wrote:
> On 9/11/06, Roland Dreier <rdreier@cisco.com> wrote:
>>     Jeff> Are we really going to add a set of hooks for each DMA
>>     Jeff> engine whizbang feature?
> ...ok, but at some level we are going to need a file that has:
> EXPORT_SYMBOL_GPL(dma_whizbang_op1)
> . . .
> EXPORT_SYMBOL_GPL(dma_whizbang_opX)
> correct?

If properly modularized, you'll have multiple files with such exports.

Or perhaps you won't have such exports at all, if it is hidden inside a 
module-specific struct-of-hooks.


> I understand what you are saying Jeff, the implementation can be made
> better, but something I think is valuable is the ability to write
> clients once like NET_DMA and RAID5_DMA and have them run without
> modification on any platform that can provide the engine interface
> rather than needing a client per architecture
> IOP_RAID5_DMA...FOO_X_RAID5_DMA.

It depends on the situation.

The hardware capabilities exported by each platform[or device] vary 
greatly, not only in the raw capabilities provided, but also in the 
level of offload.

In general, we don't want to see hardware-specific stuff in generic 
code, though...


> Or is this an example of the where "Do What You Must, And No More"
> comes in, i.e. don't worry about making a generic RAID5_DMA while
> there is only one implementation existence?

> I also want to pose the question of whether the dmaengine interface
> should handle cryptographic transforms?  We already have Acrypto:
> http://tservice.net.ru/~s0mbre/blog/devel/acrypto/index.html.  At the
> same time since IOPs can do Galois Field multiplication and XOR it
> would be nice to take advantage of that for crypto acceleration, but
> this does not fit the model of a device that Acrypto supports.

It would be quite interesting to see where the synergies are between the 
two, at the very least.  "async [transform|sum]" is a superset of "async 
crypto" after all.

	Jeff



  parent reply	other threads:[~2006-09-13  4:04 UTC|newest]

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-09-11 23:00 [PATCH 00/19] Hardware Accelerated MD RAID5: Introduction Dan Williams
2006-09-11 23:17 ` [PATCH 01/19] raid5: raid5_do_soft_block_ops Dan Williams
2006-09-11 23:34   ` Jeff Garzik
2006-09-11 23:17 ` [PATCH 02/19] raid5: move write operations to a workqueue Dan Williams
2006-09-11 23:36   ` Jeff Garzik
2006-09-11 23:17 ` [PATCH 03/19] raid5: move check parity " Dan Williams
2006-09-11 23:17 ` [PATCH 04/19] raid5: move compute block " Dan Williams
2006-09-11 23:18 ` [PATCH 05/19] raid5: move read completion copies " Dan Williams
2006-09-11 23:18 ` [PATCH 06/19] raid5: move the reconstruct write expansion operation " Dan Williams
2006-09-11 23:18 ` [PATCH 07/19] raid5: remove compute_block and compute_parity5 Dan Williams
2006-09-11 23:18 ` [PATCH 08/19] dmaengine: enable multiple clients and operations Dan Williams
2006-09-11 23:44   ` Jeff Garzik
2006-09-12  0:14     ` Dan Williams
2006-09-12  0:52       ` Roland Dreier
2006-09-12  6:18         ` Dan Williams
2006-09-12  9:15           ` Evgeniy Polyakov
2006-09-13  4:04           ` Jeff Garzik [this message]
2006-09-15 16:38     ` Olof Johansson
2006-09-15 19:44       ` [PATCH] dmaengine: clean up and abstract function types (was Re: [PATCH 08/19] dmaengine: enable multiple clients and operations) Olof Johansson
2006-09-15 20:02         ` [PATCH] [v2] " Olof Johansson
2006-09-18 22:56         ` [PATCH] " Dan Williams
2006-09-19  1:05           ` Olof Johansson
2006-09-19 11:20             ` Alan Cox
2006-09-19 16:32               ` Olof Johansson
2006-09-11 23:18 ` [PATCH 09/19] dmaengine: reduce backend address permutations Dan Williams
2006-09-15 14:46   ` Olof Johansson
2006-09-11 23:18 ` [PATCH 10/19] dmaengine: expose per channel dma mapping characteristics to clients Dan Williams
2006-09-11 23:18 ` [PATCH 11/19] dmaengine: add memset as an asynchronous dma operation Dan Williams
2006-09-11 23:50   ` Jeff Garzik
2006-09-11 23:18 ` [PATCH 12/19] dmaengine: dma_async_memcpy_err for DMA engines that do not support memcpy Dan Williams
2006-09-11 23:51   ` Jeff Garzik
2006-09-11 23:18 ` [PATCH 13/19] dmaengine: add support for dma xor zero sum operations Dan Williams
2006-09-11 23:18 ` [PATCH 14/19] dmaengine: add dma_sync_wait Dan Williams
2006-09-11 23:52   ` Jeff Garzik
2006-09-11 23:18 ` [PATCH 15/19] dmaengine: raid5 dma client Dan Williams
2006-09-11 23:54   ` Jeff Garzik
2006-09-11 23:19 ` [PATCH 16/19] dmaengine: Driver for the Intel IOP 32x, 33x, and 13xx RAID engines Dan Williams
2006-09-15 14:57   ` Olof Johansson
2006-09-11 23:19 ` [PATCH 17/19] iop3xx: define IOP3XX_REG_ADDR[32|16|8] and clean up DMA/AAU defs Dan Williams
2006-09-11 23:55   ` Jeff Garzik
2006-09-11 23:19 ` [PATCH 18/19] iop3xx: Give Linux control over PCI (ATU) initialization Dan Williams
2006-09-11 23:56   ` Jeff Garzik
2006-09-11 23:19 ` [PATCH 19/19] iop3xx: IOP 32x and 33x support for the iop-adma driver Dan Williams
2006-09-11 23:38 ` [PATCH 00/19] Hardware Accelerated MD RAID5: Introduction Jeff Garzik
2006-09-11 23:53   ` Dan Williams
2006-09-12  2:41     ` Jeff Garzik
2006-09-12  5:47       ` Dan Williams
2006-09-13  4:05         ` Jeff Garzik
2006-09-13  7:15 ` Jakob Oestergaard
2006-09-13 19:17   ` Dan Williams
2006-09-14  7:42     ` Jakob Oestergaard
2006-10-11  1:46       ` Dan Williams
2006-10-08 22:18 ` Neil Brown
2006-10-10 18:23   ` Dan Williams
2006-10-11  2:44     ` Neil Brown

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=4507833A.30504@garzik.org \
    --to=jeff@garzik.org \
    --cc=akpm@osdl.org \
    --cc=christopher.leech@intel.com \
    --cc=dan.j.williams@gmail.com \
    --cc=johnpol@2ka.mipt.ru \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-raid@vger.kernel.org \
    --cc=neilb@suse.de \
    --cc=rdreier@cisco.com \
    --subject='Re: [PATCH 08/19] dmaengine: enable multiple clients and operations' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).