netdev - Re: [net-next 13/14] net/mlx5: DR, Add support for flow table id destination action

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Message-ID: <0d44ec618bb10d9d0b03ff8c20b284c4117f2092.camel@mellanox.com>
Date:   Sat, 14 Mar 2020 06:23:19 +0000
From:   Saeed Mahameed <saeedm@...lanox.com>
To:     "kuba@...nel.org" <kuba@...nel.org>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Alex Vesker <valex@...lanox.com>,
        Erez Shitrit <erezsh@...lanox.com>
Subject: Re: [net-next 13/14] net/mlx5: DR, Add support for flow table id
 destination action

On Fri, 2020-03-13 at 19:36 -0700, Jakub Kicinski wrote:
> On Fri, 13 Mar 2020 18:16:21 -0700 Saeed Mahameed wrote:
> > From: Alex Vesker <valex@...lanox.com>
> > 
> > This action allows to go to a flow table based on the table id.
> > Goto flow table id is required for supporting user space SW.
> 
> What's user space SW?

in short :) :
RDMA DEVX [1] based application.

[1] https://patchwork.ozlabs.org/cover/930449/

RDMA applications using DEVX API can access a mlx5 specially created
steering arena/domain for DEVX apps, such apps can program this domain
the way they desire while bypassing FW, and they will get lightning
speed steering rule insertion rate.