UdpEngineWrapper.vhd & _UdpEngine.py Updates

[ruck314]

Description

• adding SoftIp & SoftMac feature to UdpEngineWrapper
  • Useful feature to have when ETH connected to PCIe card that needs to dynamically change the IP and MAC

[bengineerd]

Is it intended that softIp and softMac wrap back externally to localIp and localMac? They don't seem to go anywhere otherwise. But that seems a bit complicated. Could we have a generic that allows the soft registers to override the local inputs?

[ruck314]

@bengineerd Externally loop backed because the softMac also drives the ETH PHY/MAC module as well (external of UdpEngineWrapper)

   ------------------------------------
   -- IPv4/ARP/UDP/DHCP Ethernet Layers
   ------------------------------------
   U_UDP : entity surf.UdpEngineWrapper
      generic map (
         -- Simulation Generics
         TPD_G          => TPD_G,
         -- UDP Server Generics
         SERVER_EN_G    => true,          -- UDP Server only
         SERVER_SIZE_G  => 1,
         SERVER_PORTS_G => SERVER_PORTS_C,
         -- UDP Client Generics
         CLIENT_EN_G    => false,         -- UDP Server only
         -- General IPv4/ARP/DHCP Generics
         DHCP_G         => false,
         CLK_FREQ_G     => AXIL_CLK_FREQ_G,
         COMM_TIMEOUT_G => 30)            -- Timeout used for ARP and DHCP
      port map (
         -- Local Configurations
         localMac           => localMac,  -- Configured via PCIe
         localIp            => localIp,   -- Configured via PCIe
         softMac            => localMac,  -- externally loopback
         softIp             => localIp,   -- externally loopback