doc/qat: add GCM AAD limitation

Add limitation that AAD buffer must be padded with zeroes
in GCM case.

Fixes: d4f44265a1d7 ("doc: add limitation of AAD size to QAT guide")
Cc: stable@dpdk.org

Signed-off-by: Fiona Trahe <fiona.trahe@intel.com>
---
 doc/guides/cryptodevs/qat.rst |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)
  

> -----Original Message-----
> From: Trahe, Fiona
> Sent: Thursday, January 17, 2019 7:23 PM
> To: dev@dpdk.org
> Cc: De Lara Guarch, Pablo <pablo.de.lara.guarch@intel.com>; Trahe, Fiona
> <fiona.trahe@intel.com>; akhil.goyal@nxp.com; Kusztal, ArkadiuszX
> <arkadiuszx.kusztal@intel.com>; stable@dpdk.org
> Subject: [PATCH] doc/qat: add GCM AAD limitation
> 
> Add limitation that AAD buffer must be padded with zeroes in GCM case.
> 
> Fixes: d4f44265a1d7 ("doc: add limitation of AAD size to QAT guide")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Fiona Trahe <fiona.trahe@intel.com>
> ---
>  doc/guides/cryptodevs/qat.rst |    3 +--
>  1 files changed, 1 insertions(+), 2 deletions(-)
> 
> diff --git a/doc/guides/cryptodevs/qat.rst b/doc/guides/cryptodevs/qat.rst
> index 9fb9f01..3ca70bc 100644
> --- a/doc/guides/cryptodevs/qat.rst
> +++ b/doc/guides/cryptodevs/qat.rst
> @@ -79,10 +79,9 @@ Limitations
>  * SNOW 3G (UIA2) and ZUC (EIA3) supported only if hash length and offset
> fields are byte-multiple.
>  * No BSD support as BSD QAT kernel driver not available.
>  * ZUC EEA3/EIA3 is not supported by dh895xcc devices
> -* Maximum additional authenticated data (AAD) for GCM is 240 bytes long.
> +* Maximum additional authenticated data (AAD) for GCM is 240 bytes long
> and must be passed to the device in a buffer rounded up to the nearest
> block-size multiple (x16) and padded with zeros.
>  * Queue pairs are not thread-safe (that is, within a single queue pair, RX and
> TX from different lcores is not supported).
> 
> -
>  Extra notes on KASUMI F9
>  ~~~~~~~~~~~~~~~~~~~~~~~~
> 
> --
> 1.7.0.7

Acked-by: Arek Kusztal <arkadiuszx.kusztal@intel.com>
  

> > Add limitation that AAD buffer must be padded with zeroes in GCM case.
> > 
> > Fixes: d4f44265a1d7 ("doc: add limitation of AAD size to QAT guide")
> > Cc: stable@dpdk.org
> > 
> > Signed-off-by: Fiona Trahe <fiona.trahe@intel.com>
> 
> Acked-by: Arek Kusztal <arkadiuszx.kusztal@intel.com>

Applied, thanks