[v5] doc: update flow non-cached mode notes

  This patch updates the MLX5 PMD and release notes documentations.
Adding the notes of the behavior change that rte flows organization
is switched into non-cached mode for applications.

Signed-off-by: Bing Zhao <bingz@mellanox.com>
Acked-by: Ori Kam <orika@mellanox.com>
---
v2: update the description in release notes.
v3: update the notes of rte_flow for application.
v4: update the descriptions.
v5: update the format of lines splitting.
---
 doc/guides/nics/mlx5.rst               | 14 ++++++++++++++
 doc/guides/rel_notes/release_20_05.rst |  1 +
 2 files changed, 15 insertions(+)
  

Hi,

> -----Original Message-----
> From: Bing Zhao <bingz@mellanox.com>
> Sent: Wednesday, April 22, 2020 6:27 PM
> To: john.mcnamara@intel.com; marko.kovacevic@intel.com; Slava Ovsiienko
> <viacheslavo@mellanox.com>; Ori Kam <orika@mellanox.com>; Matan
> Azrad <matan@mellanox.com>
> Cc: Shahaf Shuler <shahafs@mellanox.com>; Raslan Darawsheh
> <rasland@mellanox.com>; dev@dpdk.org; Thomas Monjalon
> <thomas@monjalon.net>
> Subject: [PATCH v5] doc: update flow non-cached mode notes
> 
> This patch updates the MLX5 PMD and release notes documentations.
> Adding the notes of the behavior change that rte flows organization
> is switched into non-cached mode for applications.
> 
> Signed-off-by: Bing Zhao <bingz@mellanox.com>
> Acked-by: Ori Kam <orika@mellanox.com>
> ---
> v2: update the description in release notes.
> v3: update the notes of rte_flow for application.
> v4: update the descriptions.
> v5: update the format of lines splitting.
> ---
>  doc/guides/nics/mlx5.rst               | 14 ++++++++++++++
>  doc/guides/rel_notes/release_20_05.rst |  1 +
>  2 files changed, 15 insertions(+)
> 
> diff --git a/doc/guides/nics/mlx5.rst b/doc/guides/nics/mlx5.rst
> index 759d0ac..fd5b697 100644
> --- a/doc/guides/nics/mlx5.rst
> +++ b/doc/guides/nics/mlx5.rst
> @@ -1290,6 +1290,7 @@ Supported hardware offloads
> 
>  Notes for metadata
>  ------------------
> +
>  MARK and META items are interrelated with datapath - they might move
> from/to
>  the applications in mbuf fields. Hence, zero value for these items has the
>  special meaning - it means "no metadata are provided", not zero values are
> @@ -1300,6 +1301,19 @@ set, and we should allow to specify zero values as
> rte_flow parameters for the
>  META and MARK items and actions. In the same time zero mask has no
> meaning and
>  should be rejected on validation stage.
> 
> +Notes for rte_flow
> +------------------
> +
> +Flows are not cached in the driver.
> +When stopping a device port, all the flows created on this port from the
> +application will be flushed automatically in the background.
> +After stopping the device port, all flows on this port become invalid and
> +not represented in the system.
> +All references to these flows held by the application should be discarded
> +directly but neither destroyed nor flushed.
> +
> +The application should re-create the flows as required after the port restart.
> +
>  Notes for testpmd
>  -----------------
> 
> diff --git a/doc/guides/rel_notes/release_20_05.rst
> b/doc/guides/rel_notes/release_20_05.rst
> index 8c71dc1..e91fe14 100644
> --- a/doc/guides/rel_notes/release_20_05.rst
> +++ b/doc/guides/rel_notes/release_20_05.rst
> @@ -79,6 +79,7 @@ New Features
>    * Added support for matching on IPv4 Time To Live and IPv6 Hop Limit.
>    * Added support for creating Relaxed Ordering Memory Regions.
>    * Added support for jumbo frame size (9K MTU) in Multi-Packet RQ mode.
> +  * Removed flow rules caching for memory saving and compliance with
> ethdev API.
>    * Optimized the memory consumption of flow.
> 
>  * **Updated the Intel ice driver.**
> --
> 1.8.3.1


Patch rebased and applied to next-net-mlx,

Kindest regards,
Raslan Darawsheh