[net-next,v15,0/3] AX88796C SPI Ethernet Adapter

Message

Lukasz Stelmach July 27, 2021, 9:43 a.m. UTC

This is a driver for AX88796C Ethernet Adapter connected in SPI mode as
found on ARTIK5 evaluation board. The driver has been ported from a
v3.10.9 vendor kernel for ARTIK5 board.

Changes in v15:
  - rebased onto net-next 5.14-rc2 (268ca4129d8d)
  - added explicit cast of le16_to_cpus() argument to u16*
    (reported by: kernel test robot <[e-mail]>)
  - removed invalid and superfluous call to u64_stats_init()
    (reported by: Jakub Kicinski <[e-mail]>)
  
Changes in v14:
  - rebased onto net-next 5.14-rc1 (0d6835ffe50c)

Changes in v13:
  - rebased onto net-next (ebbf5fcb94a7)
  - minor fix: use u64_stats_update_{begin_irqsave,end_irqrestore}
  - minor fix: initialize the syncp lock

Changes in v12:
  - rebased to net-next-5.13
  - added missing spaces after commas
  - corrected indentation

Changes in v11:
  - changed stat counters to 64-bit
  - replaced WARN_ON(!mutex_is_locked()) with lockdep_assert_held()
  - replaced ax88796c_free_skb_queue() with __skb_queue_purge()
  - added cancel_work_sync() for ax_work
  - removed unused fields of struct skb_data
  - replaced MAX() with max() from minmax.h
  - rebased to net-next (resend)

Changes in v10:
  - removed unused variable
 
Changes in v9:
  - used pskb_extend_head()
  - used ethtool private flags instead of tunables to switch SPI
    compression
  - changed
    - alloc_skb() to netdev_alloc(skb)
    - __pskb_trim() to pskb_trim()
  - removed:
    - chages to skb->truesize
    - unnecessary casting to short
    - return f() in a void function
    - IRQF_SHARED flags
    - unnecessary memset(0) of kzalloc()ed buffer
    - unused endiannes detection
    - unnecessary __packed attribute for some structures
  - added:
    - temporary variable in AX_WRITE/READ sequences
    - missin mutex_unlock() in error paths
  - axspi_read_reg() returns a constant value in case of an error
  
Changes in v8:
  - fixed the entry in MAINTAINERS
  - removed unnecessary netif_err()
  - changed netif_rx() to netif_rx_ni() for code running in a process
    context
  - added explicit type casting for ~BIT()

Changes in v7:
  - removed duplicate code
  - moved a constant buffer definition away from a header file

Changes in v6:
  - fixed typos in Kconfig
  - checked argument value in ax88796c_set_tunable
  - updated tags in commit messages

Changes in v5:
  - coding style (local variable declarations)
  - added spi0 node in the DT binding example and removed
    interrupt-parent
  - removed comp module parameter
  - added CONFIG_SPI_AX88796C_COMPRESSION option to set the initial
    state of SPI compression
  - introduced new ethtool tunable "spi-compression" to controll SPI
    transfer compression
  - removed unused fields in struct ax88796c_device
  - switched from using buffers allocated on stack for SPI transfers
    to DMA safe ones embedded in struct ax_spi and allocated with
    kmalloc()

Changes in v4:
  - fixed compilation problems in asix,ax88796c.yaml and in
  ax88796c_main.c introduced in v3

Changes in v3:
  - modify vendor-prefixes.yaml in a separate patch
  - fix several problems in the dt binding
    - removed unnecessary descriptions and properties
    - changed the order of entries
    - fixed problems with missing defines in the example
  - change (1 << N) to BIT(N), left a few (0 << N)
  - replace ax88796c_get_link(), ax88796c_get_link_ksettings(),
    ax88796c_set_link_ksettings(), ax88796c_nway_reset(),
    ax88796c_set_mac_address() with appropriate kernel functions.
  - disable PHY auto-polling in MAC and use PHYLIB to track the state
    of PHY and configure MAC
  - propagate return values instead of returning constants in several
    places
  - add WARN_ON() for unlocked mutex
  - remove local work queue and use the system_wq
  - replace phy_connect_direct() with phy_connect() and move
    devm_register_netdev() to the end of ax88796c_probe()
    (Unlike phy_connect_direct() phy_connect() does not crash if the
    network device isn't registered yet.)
  - remove error messages on ENOMEM
  - move free_irq() to the end of ax88796c_close() to avoid race
    condition
  - implement flow-control

Changes in v2:
  - use phylib
  - added DT bindings
  - moved #includes to *.c files
  - used mutex instead of a semaphore for locking
  - renamed some constants
  - added error propagation for several functions
  - used ethtool for dumping registers
  - added control over checksum offloading
  - remove vendor specific PM
  - removed macaddr module parameter and added support for reading a MAC
    address from platform data (e.g. DT)
  - removed dependency on SPI from NET_VENDOR_ASIX
  - added an entry in the MAINTAINERS file
  - simplified logging with appropriate netif_* and netdev_* helpers
  - lots of style fixes

Łukasz Stelmach (3):
  dt-bindings: vendor-prefixes: Add asix prefix
  dt-bindings: net: Add bindings for AX88796C SPI Ethernet Adapter
  net: ax88796c: ASIX AX88796C SPI Ethernet Adapter Driver

 .../bindings/net/asix,ax88796c.yaml           |   73 ++
 .../devicetree/bindings/vendor-prefixes.yaml  |    2 +
 MAINTAINERS                                   |    6 +
 drivers/net/ethernet/Kconfig                  |    1 +
 drivers/net/ethernet/Makefile                 |    1 +
 drivers/net/ethernet/asix/Kconfig             |   35 +
 drivers/net/ethernet/asix/Makefile            |    6 +
 drivers/net/ethernet/asix/ax88796c_ioctl.c    |  239 ++++
 drivers/net/ethernet/asix/ax88796c_ioctl.h    |   26 +
 drivers/net/ethernet/asix/ax88796c_main.c     | 1148 +++++++++++++++++
 drivers/net/ethernet/asix/ax88796c_main.h     |  568 ++++++++
 drivers/net/ethernet/asix/ax88796c_spi.c      |  115 ++
 drivers/net/ethernet/asix/ax88796c_spi.h      |   69 +
 13 files changed, 2289 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/net/asix,ax88796c.yaml
 create mode 100644 drivers/net/ethernet/asix/Kconfig
 create mode 100644 drivers/net/ethernet/asix/Makefile
 create mode 100644 drivers/net/ethernet/asix/ax88796c_ioctl.c
 create mode 100644 drivers/net/ethernet/asix/ax88796c_ioctl.h
 create mode 100644 drivers/net/ethernet/asix/ax88796c_main.c
 create mode 100644 drivers/net/ethernet/asix/ax88796c_main.h
 create mode 100644 drivers/net/ethernet/asix/ax88796c_spi.c
 create mode 100644 drivers/net/ethernet/asix/ax88796c_spi.h