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Date: Thu, 14 Dec 2023 12:18:24 +0000
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Subject: Re: [PATCH v4 1/2] ethdev: add random item support
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To: Michael Baum <michaelba@nvidia.com>, dev@dpdk.org
Cc: Ori Kam <orika@nvidia.com>, Dariusz Sosnowski <dsosnowski@nvidia.com>,
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References: <20231130163215.666239-1-michaelba@nvidia.com>
 <20231214105844.1640764-1-michaelba@nvidia.com>
 <20231214105844.1640764-2-michaelba@nvidia.com>
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On 12/14/2023 10:58 AM, Michael Baum wrote:
> Add support for a new item type "RTE_FLOW_ITEM_TYPE_RANDOM".
> This item enables to match on some random value as a part of flow rule.
> 
> Signed-off-by: Michael Baum <michaelba@nvidia.com>
> ---
>  doc/guides/nics/features/default.ini   |  1 +
>  doc/guides/prog_guide/rte_flow.rst     | 14 +++++++++++
>  doc/guides/rel_notes/release_24_03.rst |  5 ++++
>  lib/ethdev/rte_flow.c                  |  1 +
>  lib/ethdev/rte_flow.h                  | 35 +++++++++++++++++++++++++-
>  5 files changed, 55 insertions(+), 1 deletion(-)
> 
> diff --git a/doc/guides/nics/features/default.ini b/doc/guides/nics/features/default.ini
> index 806cb033ff..6d50236292 100644
> --- a/doc/guides/nics/features/default.ini
> +++ b/doc/guides/nics/features/default.ini
> @@ -140,6 +140,7 @@ pppoe_proto_id       =
>  ptype                =
>  quota                =
>  raw                  =
> +random               =
>  represented_port     =
>  sctp                 =
>  tag                  =
> diff --git a/doc/guides/prog_guide/rte_flow.rst b/doc/guides/prog_guide/rte_flow.rst
> index 627b845bfb..900fdaefb6 100644
> --- a/doc/guides/prog_guide/rte_flow.rst
> +++ b/doc/guides/prog_guide/rte_flow.rst
> @@ -1573,6 +1573,20 @@ Matches the packet type as defined in rte_mbuf_ptype.
>  
>  - ``packet_type``: L2/L3/L4 and tunnel information.
>  
> +Item: ``RANDOM``
> +^^^^^^^^^^^^^^^^
> +
> +Matches a random value.
> +
> +A random unsigned integer (at most 32-bit) is generated for each packet during
> +flow rule processing, by either HW, SW or some external source.
> +Application can match on either exact value or range of values.
> +This value is not based on the packet data/headers.
> +Application shouldn't assume that this value is kept during the lifetime of
> +the packet.
> +
> +- ``value``: Specific value to match.
> +


Hi Michael,

What is the usecase for the 'random' flow item?

Is it to match some kind of metadata generated by HW?
Or is it a way to sampling traffic?

And how random 'random' item is, is it configured/set in HW or random
per packet?