Changes between Version 17 and Version 18 of Component/Vci Master Nic


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Timestamp:
Jul 26, 2020, 2:09:47 PM (5 years ago)
Author:
alain
Comment:

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  • Component/Vci Master Nic

    v17 v18  
    1212
    1313To improve the throughput, this component supports up to 8 channels.
    14 These channels are indexed by an index derived from the (source) remote IP address and port for the received (RX) packets,
    15 and from the (destination) remote IP address and port for the sent (TX) packets:
     14These channels are indexed by a ''key'' derived from the (source) remote IP address and port for the received (RX) packets, and from the (destination) remote IP address and port for the sent (TX) packets:
    1615{{{
    1716            uint32_t key = ( ((addr     ) & 0xFF) +
    … …  
    2928containing one single Ethernet packet.
    3029
    31 The received packets (RX) and the sent packets (TX) are stored in
    32 two memory mapped software queues, called chained buffers, and defined by the ''nic_chbuf_s'' C structure. The number of containers, defining the queue depth, is a software defined parameter.
     30The received packets (RX) and the sent packets (TX) are stored in two memory mapped software queues, called ''chained buffer'', and defined by the '''nic_chbuf_s'' C structure. Each slot in the queue is a ''container''. The number of containers, defining the queue depth, is a software defined parameter.
    3331The physical addresses are used by the hardware NIC DMA engines.
    3432The virtual addresses are used by the software NIC drivers.
    … …  
    4341}}}
    4442
    45 Each container contain one single Ethernet Packet.
    46 The ''nic_cont_s'' C structure contains a 2040 bytes data buffer, the actual packet length, and
    47 the container state : full (owned by the reader) / empty (owned by the writer).
     43The '''nic_cont_s''' C structure contains a 2040 bytes data buffer, the actual ethernet packet length (in bytes), and the container state : full (owned by the reader) / empty (owned by the writer).
    4844Thist state variable is used as a SET/RESET flip-flop to synchronize the software server thread, and the hardware NIC DMA engine.
     45{{{
    4946struct nic_cont_s
    50 {{{
    5147{
    5248    uint8_t    buf[2040];                        /*! Ethernet packet (42 to 2040 bytes     */
    … …  
    7167 * the is_rx   bit   is sent in TRDID[2]   
    7268
    73 Regarding the GMII physical interface, this simulation model supports three modes
     69Regarding the GMII physical interface, the systemC simulation model supports three modes
    7470of operation, defined by a constructor parameter:
    7571 * '''NIC_MODE_FILE''': Both the RX packets stream an the TX packets stream are read/written from/to dedicated files "nic_rx_file.txt" and "nic_tx_file.txt", stored in the same directory as the top.cpp file.