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

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Date:   Tue, 25 Feb 2020 16:30:52 +0000
From:   Vadym Kochan <vadym.kochan@...ision.eu>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "David S . Miller" <davem@...emloft.net>
CC:     Vadym Kochan <vadym.kochan@...ision.eu>,
        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>
Subject: [RFC net-next 0/3] net: marvell: prestera: Add Switchdev driver for
 Prestera family ASIC device 98DX326x (AC3x)

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

 .../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

-- 
2.17.1