Re: [PATCH net v6 0/6] net: marvell: prestera: Add Switchdev driver for Prestera family ASIC device 98DX3255 (AC3x)

From: Vadym Kochan
Date: Wed Sep 02 2020 - 16:58:14 EST

Sorry, I mistakenly used "net" instead of "net-next" as label.

On Wed, Sep 02, 2020 at 06:04:36PM +0300, Vadym Kochan wrote:
> Marvell Prestera 98DX3255 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 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 v6:
> 1) Use rwlock to protect port list on create/delete stages. The list
> is mostly readable by fw event handler or packets receiver, but
> updated only on create/delete port which are performed on switch init/fini
> stages.
>
> 2) Remove not needed variable initialization in prestera_dsa.c:prestera_dsa_parse()
>
> 3) Get rid of bounce buffer used by tx handler in prestera_rxtx.c,
> the bounce buffer should be handled by dma_xxx API via swiotlb.
>
> 4) Fix PRESTERA_SDMA_RX_DESC_PKT_LEN macro by using correct GENMASK(13, 0) in prestera_rxtx.c
>
> Patches updated:
> [1] net: marvell: prestera: Add driver for Prestera family ASIC devices
>
> 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 | 209 +++
> .../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 | 665 +++++++++
> .../ethernet/marvell/prestera/prestera_pci.c | 778 ++++++++++
> .../ethernet/marvell/prestera/prestera_rxtx.c | 834 +++++++++++
> .../ethernet/marvell/prestera/prestera_rxtx.h | 21 +
> .../marvell/prestera/prestera_switchdev.c | 1289 +++++++++++++++++
> .../marvell/prestera/prestera_switchdev.h | 16 +
> 20 files changed, 6348 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
>
> --
> 2.17.1
>