Dan Williams wrote:
On 9/11/06, Roland Dreier <[email protected]> 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
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