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

From: Ido Schimmel <[email-masked]>
Date: Sat, 30 May 2020 17:29:28 +0300

On Thu, May 28, 2020 at 06:12:39PM +0300, 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 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 firmware image will be uploaded soon to the linux-firmware repository.
> 
> PATCH:
>     1) Fixed W=1 warnings

Hi,

I just applied the patches for review and checkpatch had a lot of
complaints. Some are even ERRORs. For example:

WARNING: do not add new typedefs
#1064: FILE: drivers/net/ethernet/marvell/prestera/prestera_hw.h:32:
+typedef void (*prestera_event_cb_t)

WARNING: line over 80 characters
#2007: FILE: drivers/net/ethernet/marvell/prestera/prestera_rxtx.c:321:
+                       __skb_trim(buf->skb, PRESTERA_SDMA_RX_DESC_PKT_LEN(desc));

WARNING: line over 80 characters
#2007: FILE: drivers/net/ethernet/marvell/prestera/prestera_rxtx.c:321:
+                       __skb_trim(buf->skb, PRESTERA_SDMA_RX_DESC_PKT_LEN(desc));

ERROR: Macros with complex values should be enclosed in parentheses
#196: FILE: drivers/net/ethernet/marvell/prestera/prestera_pci.c:161:
+#define PRESTERA_FW_REG_ADDR(fw, reg)  PRESTERA_FW_REG_BASE(fw) + (reg)

WARNING: prefer 'help' over '---help---' for new help texts
#52: FILE: drivers/net/ethernet/marvell/prestera/Kconfig:15:
+config PRESTERA_PCI

...

Also, smatch complaints about:

drivers/net/ethernet/marvell/prestera//prestera_ethtool.c:713
prestera_ethtool_get_strings() error: memcpy() '*prestera_cnt_name' too
small (32 vs 960)

And coccicheck about:

drivers/net/ethernet/marvell/prestera/prestera_hw.c:681:2-3: Unneeded
semicolon

> 
>     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       |  111 ++
>  .../marvell/prestera/prestera_devlink.h       |   25 +
>  .../ethernet/marvell/prestera/prestera_dsa.c  |  134 ++
>  .../ethernet/marvell/prestera/prestera_dsa.h  |   37 +
>  .../marvell/prestera/prestera_ethtool.c       |  737 ++++++++++
>  .../marvell/prestera/prestera_ethtool.h       |   37 +
>  .../ethernet/marvell/prestera/prestera_hw.c   | 1225 ++++++++++++++++
>  .../ethernet/marvell/prestera/prestera_hw.h   |  180 +++
>  .../ethernet/marvell/prestera/prestera_main.c |  663 +++++++++
>  .../ethernet/marvell/prestera/prestera_pci.c  |  825 +++++++++++
>  .../ethernet/marvell/prestera/prestera_rxtx.c |  860 +++++++++++
>  .../ethernet/marvell/prestera/prestera_rxtx.h |   21 +
>  .../marvell/prestera/prestera_switchdev.c     | 1286 +++++++++++++++++
>  .../marvell/prestera/prestera_switchdev.h     |   16 +
>  20 files changed, 6433 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
>