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

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Message-ID: <20170529153131.GB7924@obsidianresearch.com>
Date:   Mon, 29 May 2017 09:31:31 -0600
From:   Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:     Ilan Tayari <ilant@...lanox.com>
Cc:     Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Saeed Mahameed <saeedm@....mellanox.co.il>,
        "David S. Miller" <davem@...emloft.net>,
        Doug Ledford <dledford@...hat.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "jsorensen@...com" <jsorensen@...com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        "linux-fpga@...r.kernel.org" <linux-fpga@...r.kernel.org>,
        Alan Tull <atull@...nsource.altera.com>,
        "yi1.li@...ux.intel.com" <yi1.li@...ux.intel.com>,
        Boris Pismenny <borisp@...lanox.com>
Subject: Re: [for-next 4/6] net/mlx5: FPGA, Add basic support for Innova

On Sun, May 28, 2017 at 07:22:27AM +0000, Ilan Tayari wrote:

> This is neither PCI-bar mapped, nor mailbox command.
> The FPGA is indeed a bump-on-the-wire.
> (It has I2C to the CX4 chip, but that is for debug purposes, and too slow
> to perform real programming)

Wait.. So if it truely has nothing to do with the existing mellanox
driver, then nothing more than the fpga loader should be in the mlx5
directory?

> One flavor of the product, the Innova Flex, allows customer logic in the
> FPGA. But even then it is "wrapped" by Mellanox shell logic.
> We plan to have an in-kernel API for writing client drivers for Innova
> Flex.

The FPGA subsystem already has APIs for partial reconfiguration use
cases, you probably should not re-invent that under the mlx5 driver.

Jason