linux-kernel - Re: [RFC net-next 0/3] net: marvell: prestera: Add Switchdev driver for Prestera family ASIC device 98DX326x (AC3x)

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Date:   Fri, 28 Feb 2020 16:50:37 +0000
From:   Vadym Kochan <vadym.kochan@...ision.eu>
To:     Chris Packham <Chris.Packham@...iedtelesis.co.nz>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        Volodymyr Mytnyk <volodymyr.mytnyk@...ision.eu>,
        Oleksandr Mazur <oleksandr.mazur@...ision.eu>,
        Andrii Savka <andrii.savka@...ision.eu>,
        Taras Chornyi <taras.chornyi@...ision.eu>,
        Serhiy Boiko <serhiy.boiko@...ision.eu>
Subject: Re: [RFC net-next 0/3] net: marvell: prestera: Add Switchdev driver
 for Prestera family ASIC device 98DX326x (AC3x)

Hi Chris,

On Tue, Feb 25, 2020 at 10:45:09PM +0000, Chris Packham wrote:
> Hi Vadym,
> 
> On Tue, 2020-02-25 at 16:30 +0000, Vadym Kochan wrote:
> > Marvell Prestera 98DX326x integrates up to 24 ports of 1GbE with 8
> > ports of 10GbE uplinks or 2 ports of 40Gbps stacking for a largely
> > wireless SMB deployment.
> > 
> > Prestera Switchdev is a firmware based driver which operates via PCI
> > bus. The driver is split into 2 modules:
> > 
> >     - prestera_sw.ko - main generic Switchdev Prestera ASIC related logic.
> > 
> >     - prestera_pci.ko - bus specific code which also implements firmware
> >                         loading and low-level messaging protocol between
> >                         firmware and the switchdev driver.
> > 
> > This driver implementation includes only L1 & basic L2 support.
> > 
> > The core Prestera switching logic is implemented in prestera.c, there is
> > an intermediate hw layer between core logic and firmware. It is
> > implemented in prestera_hw.c, the purpose of it is to encapsulate hw
> > related logic, in future there is a plan to support more devices with
> > different HW related configurations.
> 
> Very excited by this patch series. We have some custom designs using
> the AC3x. I'm in the process of getting the board dtses ready for
> submitting upstream. 
> 
> Please feel free to add me to the Cc list for future versions of this
> patch set (and releated ones).
> 
> I'll also look to see what we can do to test on our hardware platforms.
> 

Sure. I will add you to CC's list. Please note that you need to make
sure that your board design follows Marvell Design Guide for switchdev
solution.

> > 
> > The firmware has to be loaded each time device is reset. The driver is
> > loading it from:
> > 
> >     /lib/firmware/marvell/prestera_fw_img.bin
> > 
> > The firmware image version is located within internal header and consists
> > of 3 numbers - MAJOR.MINOR.PATCH. Additionally, driver has hard-coded
> > minimum supported firmware version which it can work with:
> > 
> >     MAJOR - reflects the support on ABI level between driver and loaded
> >             firmware, this number should be the same for driver and
> >             loaded firmware.
> > 
> >     MINOR - this is the minimal supported version between driver and the
> >             firmware.
> > 
> >     PATCH - indicates only fixes, firmware ABI is not changed.
> > 
> > The firmware image will be submitted to the linux-firmware after the
> > driver is accepted.
> > 
> > The following Switchdev features are supported:
> > 
> >     - VLAN-aware bridge offloading
> >     - VLAN-unaware bridge offloading
> >     - FDB offloading (learning, ageing)
> >     - Switchport configuration
> > 
> > CPU RX/TX support will be provided in the next contribution.
> > 
> > Vadym Kochan (3):
> >   net: marvell: prestera: Add Switchdev driver for Prestera family ASIC
> >     device 98DX325x (AC3x)
> >   net: marvell: prestera: Add PCI interface support
> >   dt-bindings: marvell,prestera: Add address mapping for Prestera
> >     Switchdev PCIe driver
> > 
> >  .../bindings/net/marvell,prestera.txt         |   13 +
> >  drivers/net/ethernet/marvell/Kconfig          |    1 +
> >  drivers/net/ethernet/marvell/Makefile         |    1 +
> >  drivers/net/ethernet/marvell/prestera/Kconfig |   24 +
> >  .../net/ethernet/marvell/prestera/Makefile    |    5 +
> >  .../net/ethernet/marvell/prestera/prestera.c  | 1502 +++++++++++++++++
> >  .../net/ethernet/marvell/prestera/prestera.h  |  244 +++
> >  .../marvell/prestera/prestera_drv_ver.h       |   23 +
> >  .../ethernet/marvell/prestera/prestera_hw.c   | 1094 ++++++++++++
> >  .../ethernet/marvell/prestera/prestera_hw.h   |  159 ++
> >  .../ethernet/marvell/prestera/prestera_pci.c  |  840 +++++++++
> >  .../marvell/prestera/prestera_switchdev.c     | 1217 +++++++++++++
> >  12 files changed, 5123 insertions(+)
> >  create mode 100644 drivers/net/ethernet/marvell/prestera/Kconfig
> >  create mode 100644 drivers/net/ethernet/marvell/prestera/Makefile
> >  create mode 100644 drivers/net/ethernet/marvell/prestera/prestera.c
> >  create mode 100644 drivers/net/ethernet/marvell/prestera/prestera.h
> >  create mode 100644 drivers/net/ethernet/marvell/prestera/prestera_drv_ver.h
> >  create mode 100644 drivers/net/ethernet/marvell/prestera/prestera_hw.c
> >  create mode 100644 drivers/net/ethernet/marvell/prestera/prestera_hw.h
> >  create mode 100644 drivers/net/ethernet/marvell/prestera/prestera_pci.c
> >  create mode 100644 drivers/net/ethernet/marvell/prestera/prestera_switchdev.c
> > 

Regards,
Vadym Kochan