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

From: Vadym Kochan
Date: Sat May 30 2020 - 10:52:49 EST

Hi Ido,

On Sat, May 30, 2020 at 05:29:28PM +0300, Ido Schimmel wrote:
> 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)
I may be wrong, as I remember Jiri suggested it and looks like
it makes sense. I really don't have strong opinion about this.

>
> 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)
This one makes sense.
>
> WARNING: prefer 'help' over '---help---' for new help texts
> #52: FILE: drivers/net/ethernet/marvell/prestera/Kconfig:15:
> +config PRESTERA_PCI
I will fix it.
>
> ...

The most are about using ethtool types which are in camel style.
Regarding > 80 chars is is a required rule ? I saw some discussion
on LKML that 80+ are acceptable sometimes.

>
> 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
These looks interesting, I did not use smatch and coccicheck, will look
on these.

>
> >
> > 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
> >