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Date:   Sun, 22 Nov 2020 08:41:58 +0200
From:   Eli Cohen <elic@...dia.com>
To:     Jakub Kicinski <kuba@...nel.org>
CC:     Saeed Mahameed <saeedm@...dia.com>,
        Leon Romanovsky <leonro@...lanox.com>,
        <netdev@...r.kernel.org>, <linux-rdma@...r.kernel.org>,
        Eli Cohen <eli@...lanox.com>, Mark Bloch <mbloch@...dia.com>,
        Maor Gottlieb <maorg@...dia.com>
Subject: Re: [PATCH mlx5-next 11/16] net/mlx5: Add VDPA priority to NIC RX
 namespace

On Sat, Nov 21, 2020 at 04:01:55PM -0800, Jakub Kicinski wrote:
> On Fri, 20 Nov 2020 15:03:34 -0800 Saeed Mahameed wrote:
> > From: Eli Cohen <eli@...lanox.com>
> > 
> > Add a new namespace type to the NIC RX root namespace to allow for
> > inserting VDPA rules before regular NIC but after bypass, thus allowing
> > DPDK to have precedence in packet processing.
> 
> How does DPDK and VDPA relate in this context?

mlx5 steering is hierarchical and defines precedence amongst namespaces.
Up till now, the VDPA implementation would insert a rule into the
MLX5_FLOW_NAMESPACE_BYPASS hierarchy which is used by DPDK thus taking
all the incoming traffic.

The MLX5_FLOW_NAMESPACE_VDPA hirerachy comes after
MLX5_FLOW_NAMESPACE_BYPASS.

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