Re: [PATCH] crypto: caam - fix rfc4106 encap shared descriptor

["Horia Geantă" <horia.geanta@freescale.com>]

On 7/30/2015 5:03 PM, Herbert Xu wrote:
> On Thu, Jul 30, 2015 at 04:59:01PM +0300, Horia Geantă wrote:
>>
>> Indeed, there is:
>> A-005473 - Using SEQ FIFO LOAD SKIP and SEQ FIFO STORE SKIP
>> simultaneously will cause the DECO to hang.
>>
>> However, the skip commands are not consecutive, there's a math command
>> between them (both for encap and decap descriptors).
> 
> Cool, I didn't know that inserting a math command could also
> work around the hang.

We double checked this with the HW design team.
While tests pass, we're not safe with the approach, since the issue is
timing sensible and depends on S/G tables format, whether they are
previously fetched etc.

I'll send a v2 shortly, using the proposed erratum workaround.

Thanks,
Horia