• Steen Hegelund's avatar
    net: sparx5: switchdev: adding frame DMA functionality · 10615907
    Steen Hegelund authored
    This add frame DMA functionality to the Sparx5 platform.
    
    Ethernet frames can be extracted or injected autonomously to or from the
    device’s DDR3/DDR3L memory and/or PCIe memory space. Linked list data
    structures in memory are used for injecting or extracting Ethernet frames.
    The FDMA generates interrupts when frame extraction or injection is done
    and when the linked lists need updating.
    
    The FDMA implements two extraction channels, one per switch core port
    towards the VCore CPU system and a total of six injection channels.
    Extraction channels are mapped one-to-one to the CPU ports, while injection
    channels can be individually assigned to any CPU port.
    
    - FDMA channel 0 through 5 corresponds to CPU port 0 injection direction
      FDMA_CH_CFG[channel].CH_INJ_PORT is set to 0.
    - FDMA channel 0 through 5 corresponds to CPU port 1 injection direction when
      FDMA_CH_CFG[channel].CH_INJ_PORT is set to 1.
    - FDMA channel 6 corresponds to CPU port 0 extraction direction.
    - FDMA channel 7 corresponds to CPU port 1 extraction direction.
    
    The FDMA implements a strict priority scheme among channels. Extraction
    channels are prioritized over injection channels and secondarily channels
    with higher channel number are prioritized over channels with lower number.
    On the other hand, ports are being served on an equal-bandwidth principle
    both on injection and extraction directions.  The equal-bandwidth principle
    will not force an equal bandwidth. Instead, it ensures that the ports
    perform at their best considering the operating conditions.
    
    When more than one injection channel is enabled for injection on the same
    CPU port, priority determines which channel can inject data. Ownership
    is re-arbitrated on frame boundaries.
    
    The FDMA processes linked lists of DMA Control Block Structures (DCBs). The
    DCBs have the same basic structure for both injection and extraction. A DCB
    must be placed on a 64-bit word-aligned address in memory. Each DCB has a
    per-channel configurable amount of associated data blocks in memory, where
    the frame data is stored.
    
    The data blocks that are used by extraction channels must be placed on
    64-bit word aligned addresses in memory, and their length must be a
    multiple of 128 bytes.
    
    A DCB carries the pointer to the next DCB of the linked list, the INFO word
    which holds information for the DCB, and a pair of status word and memory
    pointer for every data block that it is associated with.
    Signed-off-by: default avatarSteen Hegelund <steen.hegelund@microchip.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    10615907
sparx5_main.c 28.9 KB