linux-kernel - RE: [PATCH v2 2/2] Crypto: Talitos: Support for Async

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Date:	Fri, 18 Dec 2009 23:02:22 +0800
From:	"Li Yang-R58472" <r58472@...escale.com>
To:	"Dan Williams" <dan.j.williams@...el.com>,
	"Ira W. Snyder" <iws@...o.caltech.edu>
Cc:	"Kumar Gala" <galak@...nel.crashing.org>,
	<herbert@...dor.apana.org.au>,
	"Tabi Timur-B04825" <B04825@...escale.com>,
	<linux-kernel@...r.kernel.org>, <linux-raid@...r.kernel.org>,
	<linuxppc-dev@...abs.org>,
	"Suresh Vishnu-B05022" <B05022@...escale.com>,
	<linux-crypto@...r.kernel.org>,
	"Dudhat Dipen-B09055" <B09055@...escale.com>,
	"Gupta Maneesh-B18878" <B18878@...escale.com>
Subject: RE: [PATCH v2 2/2] Crypto: Talitos: Support for Async_tx XOR offload


>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 
>xor->copy->xor->callback.

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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