[dpdk-dev] [PATCH v2] doc/guides: add more info about VT-d/iommu settings

[Fiona Trahe]

Add more information about VT-d/iommu settings for QAT PMD.
Remove limitation indicating QAT driver is not performance tuned.

Signed-off-by: Fiona Trahe <fiona.trahe at intel.com>
---

v2:
 clarified commit message


 doc/guides/cryptodevs/qat.rst | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/doc/guides/cryptodevs/qat.rst b/doc/guides/cryptodevs/qat.rst
index 70bc2b1..bbe0b12 100644
--- a/doc/guides/cryptodevs/qat.rst
+++ b/doc/guides/cryptodevs/qat.rst
@@ -77,7 +77,6 @@ Limitations
 * Hash only is not supported except SNOW 3G UIA2 and KASUMI F9.
 * Cipher only is not supported except SNOW 3G UEA2, KASUMI F8 and 3DES.
 * Only supports the session-oriented API implementation (session-less APIs are not supported).
-* Not performance tuned.
 * SNOW 3G (UEA2) and KASUMI (F8) supported only if cipher length, cipher offset fields are byte-aligned.
 * SNOW 3G (UIA2) and KASUMI (F9) supported only if hash length, hash offset fields are byte-aligned.
 * No BSD support as BSD QAT kernel driver not available.
@@ -201,7 +200,7 @@ The steps below assume you are:
 * Running DPDK on a platform with one ``DH895xCC`` device.
 * On a kernel at least version 4.4.
 
-In BIOS ensure that SRIOV is enabled and VT-d is disabled.
+In BIOS ensure that SRIOV is enabled and either a) disable VT-d or b) enable VT-d and set ``"intel_iommu=on iommu=pt"`` in the grub file.
 
 Ensure the QAT driver is loaded on your system, by executing::
 
@@ -260,7 +259,7 @@ The steps below assume you are:
 * Running DPDK on a platform with one ``C62x`` device.
 * On a kernel at least version 4.5.
 
-In BIOS ensure that SRIOV is enabled and VT-d is disabled.
+In BIOS ensure that SRIOV is enabled and either a) disable VT-d or b) enable VT-d and set ``"intel_iommu=on iommu=pt"`` in the grub file.
 
 Ensure the QAT driver is loaded on your system, by executing::
 
@@ -304,7 +303,7 @@ The steps below assume you are:
 * Running DPDK on a platform with one ``C3xxx`` device.
 * On a kernel at least version 4.5.
 
-In BIOS ensure that SRIOV is enabled and VT-d is disabled.
+In BIOS ensure that SRIOV is enabled and either a) disable VT-d or b) enable VT-d and set ``"intel_iommu=on iommu=pt"`` in the grub file.
 
 Ensure the QAT driver is loaded on your system, by executing::
 
-- 
2.5.0