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:   Wed, 26 Feb 2020 08:38:32 -0800
From:   Roopa Prabhu <roopa@...ulusnetworks.com>
To:     Vadym Kochan <vadym.kochan@...ision.eu>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Oleksandr Mazur <oleksandr.mazur@...ision.eu>,
        Taras Chornyi <taras.chornyi@...ision.eu>,
        Serhiy Boiko <serhiy.boiko@...ision.eu>,
        Andrii Savka <andrii.savka@...ision.eu>,
        Volodymyr Mytnyk <volodymyr.mytnyk@...ision.eu>,
        David Ahern <dsahern@...il.com>
Subject: Re: [RFC net-next 0/3] net: marvell: prestera: Add Switchdev driver
 for Prestera family ASIC device 98DX326x (AC3x)

On Tue, Feb 25, 2020 at 8:31 AM Vadym Kochan <vadym.kochan@...ision.eu> 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.
>
> 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
>

Have not looked at the patches yet, but very excited to see another
switchdev driver making it into the kernel!.

Thanks Marvell!.