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

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Message-ID: <20200314095754.GF67638@unreal>
Date:   Sat, 14 Mar 2020 11:57:54 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Saeed Mahameed <saeedm@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>, 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, Mar 13, 2020 at 07:36:43PM -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?

"User space software steering" is a way to add rules to the packet
processing. The rules can be written by user space applications and
they are executed by the HW.

The rdma-core (RDMA userspace counterpart) is exposing the proper API
for that functionality.
https://github.com/linux-rdma/rdma-core/blob/master/providers/mlx5/man/mlx5dv_dr_flow.3.md

Thanks