Re: [PATCH 15/21] lpfc: Implement support for wire-only DIF devices

[Christoph Hellwig <hch@infradead.org>]

On Fri, Apr 03, 2015 at 05:13:00PM -0400, James Smart wrote:
> Implement support for wire-only DIF devices
> 
> This patch adds the ability to support auto-enablement of wire-only DIF
> (DIF is generated on TX to target, stripped on RX; OS unaware DIF in use)
> for a select set of devices. Currently, there is only 1 device vendor
> supported: 3PARdata. When the feature is enabled, Inquiry commands are
> trapped, the vendor matched, and DIF enablement checked. In 3Par's case,
> there's a vendor specific check to see if the LUN supports DIF.
> If supported, DIF will be enabled on a per-lun basis.  The driver will
> trap READS/WRITEs from the OS, check for LUN DIF enablement, and if set,
> turns on write-only DIF.

NAK. We do support proper DIF, and anyone who wants it should enable
the real thing.

And even if we would want to support a hack like this we'd do it
genericly an not in a driver.