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Re: [PATCHv2 0/5] Support for Marvell switches with integrated CPUs

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On 05/01/17 17:07, Florian Fainelli wrote:
> Le 01/04/17 à 19:36, Chris Packham a écrit :
>> The 98DX3236, 98DX3336 and 98DX4251 are a set of switch ASICs with
>> integrated CPUs. They CPU block is common within these product lines and
>> (as far as I can tell/have been told) is based on the Armada XP. There
>> are a few differences due to the fact they have to squeeze the CPU into
>> the same package as the switch.
>
> It's really great to see these changes, do you have a plan to also add
> support for the integrated switch using a DSA/switchdev driver?

I'd love to see a switchdev driver but it's a huge task (and no I'm not 
committing to writing it). As it stands Marvell ship a switch SDK 
largely executes in userspace with a small kernel module providing some 
linkage to the underlying hardware.

We (a few of us here at Allied Telesis NZ) have discussed switchdev and 
how we get from using Marvell's SDK in our products to using switchdev 
proper.

The first step would probably be some kind of trampoline driver which 
communicates with a userspace helper to do the actual work. 
Alternatively there is some support in Marvell's SDK for compilation as 
a binary blob so a proprietary kernel module is another option. Neither 
of these are particularly nice in a free software world.

A full "free" implementation would be a large undertaking. Ideally I'd 
like to see Marvell involved with producing one but so far they've not 
been interested whenever I've brought it up.

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[PATCHv2 0/5] Support for Marvell switches with integrated CPUs Chris Packham <chris.packham@alliedtelesis.co.nz> - 2017-01-05 04:40 +0100
  [PATCHv2 5/5] arm: mvebu: Add device tree for db-dxbc2 and db-xc3-24g4xg boards Chris Packham <chris.packham@alliedtelesis.co.nz> - 2017-01-05 04:40 +0100
  [PATCHv2 2/5] arm: mvebu: support for SMP on 98DX3336 SoC Chris Packham <chris.packham@alliedtelesis.co.nz> - 2017-01-05 04:40 +0100
    Re: [PATCHv2 2/5] arm: mvebu: support for SMP on 98DX3336 SoC Florian Fainelli <f.fainelli@gmail.com> - 2017-01-05 05:10 +0100
      Re: [PATCHv2 2/5] arm: mvebu: support for SMP on 98DX3336 SoC Chris Packham <Chris.Packham@alliedtelesis.co.nz> - 2017-01-05 05:50 +0100
        Re: [PATCHv2 2/5] arm: mvebu: support for SMP on 98DX3336 SoC Chris Packham <Chris.Packham@alliedtelesis.co.nz> - 2017-01-05 22:00 +0100
  [PATCHv2 4/5] arm: mvebu: Add device tree for 98DX3236 SoCs Chris Packham <chris.packham@alliedtelesis.co.nz> - 2017-01-05 04:40 +0100
    Re: [PATCHv2 4/5] arm: mvebu: Add device tree for 98DX3236 SoCs Florian Fainelli <f.fainelli@gmail.com> - 2017-01-05 05:10 +0100
      Re: [PATCHv2 4/5] arm: mvebu: Add device tree for 98DX3236 SoCs Chris Packham <Chris.Packham@alliedtelesis.co.nz> - 2017-01-05 05:40 +0100
    Re: [PATCHv2 4/5] arm: mvebu: Add device tree for 98DX3236 SoCs Mark Rutland <mark.rutland@arm.com> - 2017-01-05 15:00 +0100
      Re: [PATCHv2 4/5] arm: mvebu: Add device tree for 98DX3236 SoCs Chris Packham <Chris.Packham@alliedtelesis.co.nz> - 2017-01-05 21:20 +0100
  [PATCHv2 1/5] clk: mvebu: support for 98DX3236 SoC Chris Packham <chris.packham@alliedtelesis.co.nz> - 2017-01-05 04:40 +0100
    Re: [PATCHv2 1/5] clk: mvebu: support for 98DX3236 SoC Mark Rutland <mark.rutland@arm.com> - 2017-01-05 15:00 +0100
      Re: [PATCHv2 1/5] clk: mvebu: support for 98DX3236 SoC Chris Packham <Chris.Packham@alliedtelesis.co.nz> - 2017-01-06 00:10 +0100
  Re: [PATCHv2 0/5] Support for Marvell switches with integrated CPUs Florian Fainelli <f.fainelli@gmail.com> - 2017-01-05 05:10 +0100
    Re: [PATCHv2 0/5] Support for Marvell switches with integrated CPUs Chris Packham <Chris.Packham@alliedtelesis.co.nz> - 2017-01-05 05:30 +0100
      Re: [PATCHv2 0/5] Support for Marvell switches with integrated CPUs Andrew Lunn <andrew@lunn.ch> - 2017-01-05 14:20 +0100
        Re: [PATCHv2 0/5] Support for Marvell switches with integrated CPUs Marcin Wojtas <mw@semihalf.com> - 2017-01-05 15:10 +0100
        Re: [PATCHv2 0/5] Support for Marvell switches with integrated CPUs Chris Packham <Chris.Packham@alliedtelesis.co.nz> - 2017-01-05 20:50 +0100
          Re: [PATCHv2 0/5] Support for Marvell switches with integrated CPUs Florian Fainelli <f.fainelli@gmail.com> - 2017-01-05 21:00 +0100
  Re: [PATCHv2 0/5] Support for Marvell switches with integrated CPUs Marcin Wojtas <mw@semihalf.com> - 2017-01-05 15:10 +0100
    Re: [PATCHv2 0/5] Support for Marvell switches with integrated CPUs Chris Packham <Chris.Packham@alliedtelesis.co.nz> - 2017-01-05 21:10 +0100
  [PATCHv3 3/5] pinctrl: mvebu: pinctrl driver for 98DX3236 SoC Chris Packham <chris.packham@alliedtelesis.co.nz> - 2017-01-06 05:20 +0100
    Re: [PATCHv3 3/5] pinctrl: mvebu: pinctrl driver for 98DX3236 SoC Rob Herring <robh@kernel.org> - 2017-01-09 19:50 +0100
    Re: [PATCHv3 3/5] pinctrl: mvebu: pinctrl driver for 98DX3236 SoC Linus Walleij <linus.walleij@linaro.org> - 2017-01-11 15:50 +0100
      Re: [PATCHv3 3/5] pinctrl: mvebu: pinctrl driver for 98DX3236 SoC Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> - 2017-01-11 22:00 +0100
        Re: [PATCHv3 3/5] pinctrl: mvebu: pinctrl driver for 98DX3236 SoC Chris Packham <Chris.Packham@alliedtelesis.co.nz> - 2017-01-12 10:30 +0100
  [PATCHv3 1/5] clk: mvebu: support for 98DX3236 SoC Chris Packham <chris.packham@alliedtelesis.co.nz> - 2017-01-06 05:20 +0100
    Re: [PATCHv3 1/5] clk: mvebu: support for 98DX3236 SoC Rob Herring <robh@kernel.org> - 2017-01-09 19:40 +0100
  [PATCHv2 0/5] Support for Marvell switches with integrated CPUs Chris Packham <chris.packham@alliedtelesis.co.nz> - 2017-01-06 05:20 +0100
    [PATCHv3 5/5] arm: mvebu: Add device tree for db-dxbc2 and db-xc3-24g4xg boards Chris Packham <chris.packham@alliedtelesis.co.nz> - 2017-01-06 05:20 +0100
    [PATCHv3 2/5] arm: mvebu: support for SMP on 98DX3336 SoC Chris Packham <chris.packham@alliedtelesis.co.nz> - 2017-01-06 05:20 +0100
      Re: [PATCHv3 2/5] arm: mvebu: support for SMP on 98DX3336 SoC Stephen Boyd <sboyd@codeaurora.org> - 2017-01-06 07:40 +0100
        Re: [PATCHv3 2/5] arm: mvebu: support for SMP on 98DX3336 SoC Chris Packham <Chris.Packham@alliedtelesis.co.nz> - 2017-01-06 14:10 +0100
      Re: [PATCHv3 2/5] arm: mvebu: support for SMP on 98DX3336 SoC Rob Herring <robh@kernel.org> - 2017-01-09 19:50 +0100
    [PATCHv3 4/5] arm: mvebu: Add device tree for 98DX3236 SoCs Chris Packham <chris.packham@alliedtelesis.co.nz> - 2017-01-06 05:30 +0100
      Re: [PATCHv3 4/5] arm: mvebu: Add device tree for 98DX3236 SoCs Rob Herring <robh@kernel.org> - 2017-01-09 19:50 +0100

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