netdev - Re: [PATCH mlx5-next 09/16] net/mlx5: Expose IP-in-IP TX and RX capability bits

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Message-ID: <4c73dae44287ea0c85fdb55c1e4b929a3b01ff43.camel@kernel.org>
Date:   Mon, 23 Nov 2020 13:15:51 -0800
From:   Saeed Mahameed <saeed@...nel.org>
To:     Aya Levin <ayal@...dia.com>, Jakub Kicinski <kuba@...nel.org>
Cc:     Leon Romanovsky <leonro@...lanox.com>, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org, Moshe Shemesh <moshe@...dia.com>
Subject: Re: [PATCH mlx5-next 09/16] net/mlx5: Expose IP-in-IP TX and RX
 capability bits

On Sun, 2020-11-22 at 17:17 +0200, Aya Levin wrote:
> 
> On 11/22/2020 1:58 AM, Jakub Kicinski wrote:
> > On Fri, 20 Nov 2020 15:03:32 -0800 Saeed Mahameed wrote:
> > > From: Aya Levin <ayal@...dia.com>
> > > 
> > > Expose FW indication that it supports stateless offloads for IP
> > > over IP
> > > tunneled packets per direction. In some HW like ConnectX-4 IP-in-
> > > IP
> > > support is not symmetric, it supports steering on the inner
> > > header but
> > > it doesn't TX-Checksum and TSO. Add IP-in-IP capability per
> > > direction to
> > > cover this case as well.
> > 
> > What's the use for the rx capability in Linux? We don't have an API
> > to
> > configure that AFAIK.
> > 
> Correct, the rx capability bit is used by the driver to allow flow 
> steering on the inner header.

Currently we use the global HW capability to enable flow steering on
inner header for RSS. in upcoming patch to net-next we will relax the
dependency on the global capability and will use the dedicated rx cap
instead.