Re: [PATCH 13/14] target/rd: Add DIF protection into rd_execute_rw

[Sagi Grimberg]

On 1/10/2014 11:06 PM, Martin K. Petersen wrote:
> > > > > > "Sagi" == Sagi Grimberg <sagig@xxxxxxxxxxxx> writes:
> Sagi> I wander how we can skip sbc_dif_verify_xxxx if the transport
> Sagi> already offloaded DIF verify.  I think that the transport should
> Sagi> signal the core layer that it is able to offload DIF
> Sagi> (ADD/STRIP/PASS/VERIFY), in which case the core should turn off
> Sagi> the backstore DIF verify emulation to sustain performance.
>
> Yeah, for SAS and FC it would be nice to leverage DIX and let the ASIC
> do the actual checking and splitting. I assume the same is true for your
> hw.

Correct! we should avoid a duplicate DIF processing. if the HW supports 
offloading DIF processing, target core can shutdown backstore 
verfy_read/verify_write methods.
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