RE: [PATCH v2 2/2] Crypto: Talitos: Support for Async_tx XOR offload

From: Li Yang-R58472
Date: Fri Dec 18 2009 - 10:02:54 EST

>Subject: Re: [PATCH v2 2/2] Crypto: Talitos: Support for
>Async_tx XOR offload
>Ira W. Snyder wrote:
>> Yes, I have used the device_prep_dma_interrupt()
>functionality quite a
>> while back. However, I found it to be pretty much useless.
>The specific case it is needed for Talitos/raid is a channel
>switch interrupt. The interrupt causes the cleanup operation
>to be run which will kick off any pending dependent operations
>on the xor channel. In the raid case we only have callbacks
>at the end of a chain, so we need the interrupt to kick the
>engine in an operation chain like

I am wondering if can use more callbacks to kick off pending dependent operations?
Like xor->callback->copy->callback->xor->callback?

- Leo
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