Re: [PATCH 09/14] target/configfs: Expose protection deviceattributes

[Nicholas A. Bellinger]

Hey MKP,

On Fri, 2014-01-10 at 16:01 -0500, Martin K. Petersen wrote:
> >>>>> "nab" == Nicholas A Bellinger <nab@xxxxxxxxxxxxx> writes:
> 
> nab> This patch adds support for exposing DIF protection device
> nab> attributes via configfs.  This includes:
> 
> nab>    pi_prot_type: Protection Type (0, 1, 3 currently support)
> nab>    pi_prot_version: Protection Version (DIF v1 currently supported)
> 
> What's DIF v2?
> 

This would be the proposed 16-byte protection scheme for SBC4.

> nab>    pi_guard_type: Guard Type (1=DIF CRC, 2=IP CRC)
> 
> The IP checksum is only supported by DIX between OS and initiator, not
> by the target. I guess we could signal to the initiator via a
> vendor-private VPD that IP checksum is supported directly. But now what
> we have hardware-accelerated T10 CRC I don't think it's a big deal.
> 
> (scsi_debug supports IP checksum because it's both initiator and
> target).
> 

In that case, dropping the IP checksum related code now..

--nab

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