• Grygorii Strashko's avatar
    net: ethernet: ti: introduce am65x/j721e gigabit eth subsystem driver · 93a76530
    Grygorii Strashko authored
    The TI AM65x/J721E SoCs Gigabit Ethernet Switch subsystem (CPSW2G NUSS) has
    two ports - One Ethernet port (port 1) with selectable RGMII and RMII
    interfaces and an internal Communications Port Programming Interface (CPPI)
    port (Host port 0) and with ALE in between. It also contains
     - Management Data Input/Output (MDIO) interface for physical layer device
    (PHY) management;
     - Updated Address Lookup Engine (ALE) module;
     - (TBD) New version of Common platform time sync (CPTS) module.
    
    On the TI am65x/J721E SoCs CPSW NUSS Ethernet subsystem into device MCU
    domain named MCU_CPSW0.
    
    Host Port 0 CPPI Packet Streaming Interface interface supports 8 TX
    channels and one RX channels operating by TI am654 NAVSS Unified DMA
    Peripheral Root Complex (UDMA-P) controller.
    
    Introduced driver provides standard Linux net_device to user space and supports:
     - ifconfig up/down
     - MAC address configuration
     - ethtool operation:
       --driver
       --change
       --register-dump
       --negotiate phy
       --statistics
       --set-eee phy
       --show-ring
       --show-channels
       --set-channels
     - net_device ioctl mii-control
     - promisc mode
    
     - rx checksum offload for non-fragmented IPv4/IPv6 TCP/UDP packets.
       The CPSW NUSS can verify IPv4/IPv6 TCP/UDP packets checksum and fills
       csum information for each packet in psdata[2] word:
       - BIT(16) CHECKSUM_ERROR - indicates csum error
       - BIT(17) FRAGMENT -  indicates fragmented packet
       - BIT(18) TCP_UDP_N -  Indicates TCP packet was detected
       - BIT(19) IPV6_VALID,  BIT(20) IPV4_VALID - indicates IPv6/IPv4 packet
       - BIT(15, 0) CHECKSUM_ADD - This is the value that was summed
       during the checksum computation. This value is FFFFh for non fragmented
       IPV4/6 UDP/TCP packets with no checksum error.
    
       RX csum offload can be disabled:
    	 ethtool -K <dev> rx-checksum on|off
    
     - tx checksum offload support for IPv4/IPv6 TCP/UDP packets (J721E only).
       TX csum HW offload  can be enabled/disabled:
    	 ethtool -K <dev> tx-checksum-ip-generic on|off
    
     - multiq and switch between round robin/prio modes for cppi tx queues by
       using Netdev private flag "p0-rx-ptype-rrobin" to switch between
       Round Robin and Fixed priority modes:
    	 # ethtool --show-priv-flags eth0
    	 Private flags for eth0:
    	 p0-rx-ptype-rrobin: on
    	 # ethtool --set-priv-flags eth0 p0-rx-ptype-rrobin off
    
       Number of TX DMA channels can be changed using "ethtool -L eth0 tx <N>".
    
     - GRO support: the napi_gro_receive() and napi_complete_done() are used.
    Signed-off-by: default avatarGrygorii Strashko <grygorii.strashko@ti.com>
    Tested-by: default avatarMurali Karicheri <m-karicheri2@ti.com>
    Tested-by: default avatarPeter Ujfalusi <peter.ujfalusi@ti.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    93a76530
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