netdev - Re: [PATCH mlx5-next 11/16] net/mlx5: Add VDPA priority to NIC RX namespace

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20201124091219.5900e7bb@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Tue, 24 Nov 2020 09:12:19 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Saeed Mahameed <saeedm@...dia.com>
Cc:     Eli Cohen <elic@...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 Sun, 22 Nov 2020 08:41:58 +0200 Eli Cohen wrote:
> 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.

Our policy was no DPDK driver bifurcation. There's no asterisk saying
"unless you pretend you need flow filters for RDMA, get them upstream
and then drop the act".

What do you expect me to do?