Signed-off-by: Jiayu Hu <jiayu...@intel.com>
---
doc/guides/nics/vhost.rst | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/doc/guides/nics/vhost.rst b/doc/guides/nics/vhost.rst
index 912f4bd..f0d9520 100644
--- a/doc/guides/nics/vhost.rst
+++ b/doc/guides/nics/vhost.rst
@@ -25,6 +25,15 @@ Currently, the vhost PMD provides the basic functionality of
packet reception, t
* Don't need to stop RX/TX, when the user wants to stop a guest or a
virtio-net driver on guest.
+* It supports to offload large data movement in Tx operations from the
+ CPU to the I/OAT device for every queue. Note that I/OAT acceleration
+ is just enabled for split rings. In addition, a queue can only use one
+ I/OAT device, and I/OAT devices cannot be shared among vhost ports and
+ queues. That is, an I/OAT device can only be used by one queue at a
+ time. Moreover, users cannot enable I/OAT acceleration, if iommu or
+ postcopy live-migration is enabled; when enabling I/OAT acceleration
+ for a queue, Rx interrupt is not supported.
+
Vhost PMD arguments
-------------------
@@ -54,6 +63,11 @@ The user can specify below arguments in `--vdev` option.
It is used to enable tso support in vhost library.
(Default: 0 (disabled))
+#. ``dmas``:
+
+ It is used to specify DMA engines used to accelerate data movement
+ in Tx operations for queues.
+
Vhost PMD event handling
------------------------
--
2.7.4
