netdev - Re: [for-next 4/6] net/mlx5: FPGA, Add basic support for Innova

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Date:   Sun, 28 May 2017 15:33:21 +0300
From:   Or Gerlitz <gerlitz.or@...il.com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Saeed Mahameed <saeedm@....mellanox.co.il>,
        Ilan Tayari <ilant@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>,
        Doug Ledford <dledford@...hat.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "jsorensen@...com" <jsorensen@...com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        linux-fpga@...r.kernel.org,
        Alan Tull <atull@...nsource.altera.com>, yi1.li@...ux.intel.com
Subject: Re: [for-next 4/6] net/mlx5: FPGA, Add basic support for Innova

On Fri, May 26, 2017 at 8:56 PM, Alexei Starovoitov
<alexei.starovoitov@...il.com> wrote:
> On Fri, May 26, 2017 at 11:59:26AM +0300, Saeed Mahameed wrote:

>> But i agree with you some serious API brainstorming should be
>> considered, but not at this stage, this patch only tells the ConnectX card
>> (if you have FPGA, please enable it).

> serious api discussion needs be done before things like eswitch, fpga
> exposed to users otherwise we end up in the eswitch situation that
> drops packets based on its own invisible logic, but with hidden fpga
> it will be even more obscure.


Alexei,

ACK for your comment on e-switch, what we call the legacy mode for SRIOV in
Linux was a big mistake.

As you know, since 4.8 we're @ MLNX are working to fix it... we introduced a
model for VF port representors which has set the foundations for
e-switch data-path
to be programmed as an offload for kernel SW switching. We also
introduced the code
to offload TC flower base data-path and support that in for both
switch (Spectrum) ASIC
(mlxsw driver) and NIC ASIC (mlx5 driver)

Or.