[dpdk-dev] [PATCH 4/4] doc: add I/OAT acceleration support for vhost-user PMD

[Ye Xiaolong]

Hi, Jiayu

DPDK convention prefers to append the doc update with the feature patch, and
update the release note in the same patch as well.

Thanks,
Xiaolong

On 03/17, Jiayu Hu wrote:
>Signed-off-by: Jiayu Hu <jiayu.hu at 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
>