netdev - Re: [net-next 08/15] net/mlx5e: CT: Preparation for offloading +trk+new ct rules

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Message-ID: <20210108214812.GB3678@horizon.localdomain>
Date:   Fri, 8 Jan 2021 18:48:12 -0300
From:   Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
To:     Saeed Mahameed <saeed@...nel.org>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        Roi Dayan <roid@...dia.com>, Paul Blakey <paulb@...dia.com>,
        Saeed Mahameed <saeedm@...dia.com>
Subject: Re: [net-next 08/15] net/mlx5e: CT: Preparation for offloading
 +trk+new ct rules

Hi,

On Thu, Jan 07, 2021 at 09:30:47PM -0800, Saeed Mahameed wrote:
> From: Roi Dayan <roid@...dia.com>
> 
> Connection tracking associates the connection state per packet. The
> first packet of a connection is assigned with the +trk+new state. The
> connection enters the established state once a packet is seen on the
> other direction.
> 
> Currently we offload only the established flows. However, UDP traffic
> using source port entropy (e.g. vxlan, RoCE) will never enter the
> established state. Such protocols do not require stateful processing,
> and therefore could be offloaded.

If it doesn't require stateful processing, please enlight me on why
conntrack is being used in the first place. What's the use case here?

> 
> The change in the model is that a miss on the CT table will be forwarded
> to a new +trk+new ct table and a miss there will be forwarded to the slow
> path table.

AFAICU this new +trk+new ct table is a wildcard match on sport with
specific dports. Also AFAICU, such entries will not be visible to the
userspace then. Is this right?

  Marcelo