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

[James Smart <james.smart@emulex.com>]

fyi - in the v3  of the lpfc 10.5.0.0 patches I just posted, I pulled 
the patch.  We will see what to do with it. We may come back with a set 
of generic midlayer patches.

-- james s


On 4/5/2015 12:06 PM, Christoph Hellwig wrote:
> 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.
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