Re: [net-next v5 0/6] net: marvell: prestera: Add Switchdev driver for Prestera family ASIC device 98DX326x (AC3x)

From: Vadym Kochan
Date: Sun Aug 30 2020 - 04:00:57 EST

Hi Chris,

On Wed, Aug 26, 2020 at 04:30:35AM +0000, Chris Packham wrote:
> Hi Vadym,
>
> On 26/08/20 12:20 am, 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.
> I think there's a typo here or possibly in patch 1. The AC3x family has
> model numbers 98DX3255, 98DX3256, 98DX3257, 98DX3258, 98DX3259,
> 98DX3265, 98DX3268. I'm not sure which variant you're specifically
> targeting but in patch 1 you add the PCI device 0xC804 which corresponds
> to the 98DX3255.

Looks like I need fix the commit message to refer to hw id which is used
in PCI match table.

> > Prestera Switchdev is a firmware based driver that operates via PCI bus. The
> > current implementation supports only boards designed for the Marvell Switchdev
> > solution and requires special firmware.
> >
> > This driver implementation includes only L1, basic L2 support, and RX/TX.
> >
> > The core Prestera switching logic is implemented in prestera_main.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 following Switchdev features are supported:
> >
> > - VLAN-aware bridge offloading
> > - VLAN-unaware bridge offloading
> > - FDB offloading (learning, ageing)
> > - Switchport configuration
> >
> > The original firmware image is uploaded to the linux-firmware repository.
> >
> > PATCH v5:
> > 0) add Co-developed tags for people who was involved in development.
> >
> > 1) Make SPDX license as separate comment
> >
> > 2) Change 'u8 *' -> 'void *', It allows to avoid not-needed u8* casting.
> >
> > 3) Remove "," in terminated enum's.
> >
> > 4) Use GENMASK(end, start) where it is applicable in.
> >
> > 5) Remove not-needed 'u8 *' casting.
> >
> > 6) Apply common error-check pattern
> >
> > 7) Use ether_addr_copy instead of memcpy
> >
> > 8) Use define for maximum MAC address range (255)
> >
> > 9) Simplify prestera_port_state_set() in prestera_main.c by
> > using separate if-blocks for state setting:
> >
> > if (is_up) {
> > ...
> > } else {
> > ...
> > }
> >
> > which makes logic more understandable.
> >
> > 10) Simplify sdma tx wait logic when checking/updating tx_ring->burst.
> >
> > 11) Remove not-needed packed & aligned attributes
> >
> > 12) Use USEC_PER_MSEC as multiplier when converting ms -> usec on calling
> > readl_poll_timeout.
> >
> > 13) Simplified some error path handling by simple return error code in.
> >
> > 14) Remove not-needed err assignment in.
> >
> > 15) Use dev_err() in prestera_devlink_register(...).
> >
> > Patches updated:
> > [1] net: marvell: prestera: Add driver for Prestera family ASIC devices
> > [2] net: marvell: prestera: Add PCI interface support
> > [3] net: marvell: prestera: Add basic devlink support
> > [4] net: marvell: prestera: Add ethtool interface support
> > [5] net: marvell: prestera: Add Switchdev driver implementation
> >
> > PATCH v4:
> > 1) Use prestera_ prefix in netdev_ops variable.
> >
> > 2) Kconfig: use 'default PRESTERA' build type for CONFIG_PRESTERA_PCI to be
> > synced by default with prestera core module.
> >
> > 3) Use memcpy_xxio helpers in prestera_pci.c for IO buffer copying.
> >
> > 4) Generate fw image path via snprintf() instead of macroses.
> >
> > 5) Use pcim_ helpers in prestera_pci.c which simplified the
> > probe/remove logic.
> >
> > 6) Removed not needed initializations of variables which are used in
> > readl_poll_xxx() helpers.
> >
> > 7) Fixed few grammar mistakes in patch[2] description.
> >
> > 8) Export only prestera_ethtool_ops struct instead of each
> > ethtool handler.
> >
> > 9) Add check for prestera_dev_check() in switchdev event handling to
> > make sure there is no wrong topology.
> >
> > Patches updated:
> > [1] net: marvell: prestera: Add driver for Prestera family ASIC devices
> > [2] net: marvell: prestera: Add PCI interface support
> > [4] net: marvell: prestera: Add ethtool interface support
> > [5] net: marvell: prestera: Add Switchdev driver implementation
> >
> > PATCH v3:
> > 1) Simplify __be32 type casting in prestera_dsa.c
> >
> > 2) Added per-patch changelog under "---" line.
> >
> > PATCH v2:
> > 1) Use devlink_port_type_clear()
> >
> > 2) Add _MS prefix to timeout defines.
> >
> > 3) Remove not-needed packed attribute from the firmware ipc structs,
> > also the firmware image needs to be uploaded too (will do it soon).
> >
> > 4) Introduce prestera_hw_switch_fini(), to be mirrored with init and
> > do simple validation if the event handlers are unregistered.
> >
> > 5) Use kfree_rcu() for event handler unregistering.
> >
> > 6) Get rid of rcu-list usage when dealing with ports, not needed for
> > now.
> >
> > 7) Little spelling corrections in the error/info messages.
> >
> > 8) Make pci probe & remove logic mirrored.
> >
> > 9) Get rid of ETH_FCS_LEN in headroom setting, not needed.
> >
> > PATCH:
> > 1) Fixed W=1 warnings
> >
> > 2) Renamed PCI driver name to be more generic "Prestera DX" because
> > there will be more devices supported.
> >
> > 3) Changed firmware image dir path: marvell/ -> mrvl/prestera/
> > to be aligned with location in linux-firmware.git (if such
> > will be accepted).
> >
> > RFC v3:
> > 1) Fix prestera prefix in prestera_rxtx.c
> >
> > 2) Protect concurrent access from multiple ports on multiple CPU system
> > on tx path by spinlock in prestera_rxtx.c
> >
> > 3) Try to get base mac address from device-tree, otherwise use a random generated one.
> >
> > 4) Move ethtool interface support into separate prestera_ethtool.c file.
> >
> > 5) Add basic devlink support and get rid of physical port naming ops.
> >
> > 6) Add STP support in Switchdev driver.
> >
> > 7) Removed MODULE_AUTHOR
> >
> > 8) Renamed prestera.c -> prestera_main.c, and kernel module to
> > prestera.ko
> >
> > RFC v2:
> > 1) Use "pestera_" prefix in struct's and functions instead of mvsw_pr_
> >
> > 2) Original series split into additional patches for Switchdev ethtool support.
> >
> > 3) Use major and minor firmware version numbers in the firmware image filename.
> >
> > 4) Removed not needed prints.
> >
> > 5) Use iopoll API for waiting on register's value in prestera_pci.c
> >
> > 6) Use standart approach for describing PCI ID matching section instead of using
> > custom wrappers in prestera_pci.c
> >
> > 7) Add RX/TX support in prestera_rxtx.c.
> >
> > 8) Rewritten prestera_switchdev.c with following changes:
> > - handle netdev events from prestera.c
> >
> > - use struct prestera_bridge for bridge objects, and get rid of
> > struct prestera_bridge_device which may confuse.
> >
> > - use refcount_t
> >
> > 9) Get rid of macro usage for sending fw requests in prestera_hw.c
> >
> > 10) Add base_mac setting as module parameter. base_mac is required for
> > generation default port's mac.
> >
> > Vadym Kochan (6):
> > net: marvell: prestera: Add driver for Prestera family ASIC devices
> > net: marvell: prestera: Add PCI interface support
> > net: marvell: prestera: Add basic devlink support
> > net: marvell: prestera: Add ethtool interface support
> > net: marvell: prestera: Add Switchdev driver implementation
> > dt-bindings: marvell,prestera: Add description for device-tree
> > bindings
> >
> > .../bindings/net/marvell,prestera.txt | 34 +
> > drivers/net/ethernet/marvell/Kconfig | 1 +
> > drivers/net/ethernet/marvell/Makefile | 1 +
> > drivers/net/ethernet/marvell/prestera/Kconfig | 25 +
> > .../net/ethernet/marvell/prestera/Makefile | 7 +
> > .../net/ethernet/marvell/prestera/prestera.h | 208 +++
> > .../marvell/prestera/prestera_devlink.c | 114 ++
> > .../marvell/prestera/prestera_devlink.h | 26 +
> > .../ethernet/marvell/prestera/prestera_dsa.c | 106 ++
> > .../ethernet/marvell/prestera/prestera_dsa.h | 37 +
> > .../marvell/prestera/prestera_ethtool.c | 759 ++++++++++
> > .../marvell/prestera/prestera_ethtool.h | 14 +
> > .../ethernet/marvell/prestera/prestera_hw.c | 1227 ++++++++++++++++
> > .../ethernet/marvell/prestera/prestera_hw.h | 185 +++
> > .../ethernet/marvell/prestera/prestera_main.c | 646 +++++++++
> > .../ethernet/marvell/prestera/prestera_pci.c | 778 ++++++++++
> > .../ethernet/marvell/prestera/prestera_rxtx.c | 866 +++++++++++
> > .../ethernet/marvell/prestera/prestera_rxtx.h | 21 +
> > .../marvell/prestera/prestera_switchdev.c | 1289 +++++++++++++++++
> > .../marvell/prestera/prestera_switchdev.h | 16 +
> > 20 files changed, 6360 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.h
> > create mode 100644 drivers/net/ethernet/marvell/prestera/prestera_devlink.c
> > create mode 100644 drivers/net/ethernet/marvell/prestera/prestera_devlink.h
> > create mode 100644 drivers/net/ethernet/marvell/prestera/prestera_dsa.c
> > create mode 100644 drivers/net/ethernet/marvell/prestera/prestera_dsa.h
> > create mode 100644 drivers/net/ethernet/marvell/prestera/prestera_ethtool.c
> > create mode 100644 drivers/net/ethernet/marvell/prestera/prestera_ethtool.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_main.c
> > create mode 100644 drivers/net/ethernet/marvell/prestera/prestera_pci.c
> > create mode 100644 drivers/net/ethernet/marvell/prestera/prestera_rxtx.c
> > create mode 100644 drivers/net/ethernet/marvell/prestera/prestera_rxtx.h
> > create mode 100644 drivers/net/ethernet/marvell/prestera/prestera_switchdev.c
> > create mode 100644 drivers/net/ethernet/marvell/prestera/prestera_switchdev.h
> >