linux-kernel - Re: [PATCH mlx5-next 0/3] Add ICM header-modify-pattern RDMA API

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Date:   Tue, 14 Jun 2022 11:24:13 -0700
From:   Saeed Mahameed <saeed@...nel.org>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     Jason Gunthorpe <jgg@...dia.com>,
        Leon Romanovsky <leonro@...dia.com>,
        Erez Shitrit <erezsh@...lanox.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>, linux-kernel@...r.kernel.org,
        linux-rdma@...r.kernel.org, netdev@...r.kernel.org,
        Paolo Abeni <pabeni@...hat.com>,
        Saeed Mahameed <saeedm@...dia.com>,
        Yevgeny Kliteynik <kliteyn@...dia.com>
Subject: Re: [PATCH mlx5-next 0/3] Add ICM header-modify-pattern RDMA API

On 07 Jun 15:47, Leon Romanovsky wrote:
>From: Leon Romanovsky <leonro@...dia.com>
>
>SW steering manipulates packet's header using "modifying header" actions.
>Many of these actions do the same operation, but use different data each time.
>Currently we create and keep every one of these actions, which use expensive
>and limited resources.
>

Series applied to mlx5-next

>Now we introduce a new mechanism - pattern and argument, which splits
>a modifying action into two parts:
>1. action pattern: contains the operations to be applied on packet's header,
>mainly set/add/copy of fields in the packet
>2. action data/argument: contains the data to be used by each operation
>in the pattern.
>
>This way we reuse same patterns with different arguments to create new
>modifying actions, and since many actions share the same operations, we end
>up creating a small number of patterns that we keep in a dedicated cache.
>
>These modify header patterns are implemented as new type of ICM memory,
>so the following kernel patch series add the support for this new ICM type.
>
>Thanks
>