[lwip-users] Help Please: Interfacing a new ethernet driver

[Maddala Subrahmanyam]

Hi All,

 

I'm a newbie trying to understand how to integrate a new ethernet driver with LwIP.

I have spent some time understanding LwIP by using the tun/tap interface using the 'chargen' application.

 

The way I understood the tun/tap communication is as follows:

 

Chargen application

          |

          v

      tapif.c

          |    --/dev/net/tap0

          v

       tun.c (tun/tap device driver)

 

 

I tried to implement the similar flow as follows:

 

  Chargen application

            |

            v

        xyzif.c  -- modified ethernetif.c to have xyz interface routines.

            |

            v

        xyz.c (ethernet driver )

 

But I have few problems here:

1. In the case of tun/tap driver, the driver exposes a /dev/net/tap0 character device node on which we do an open() and from there on we do read/write's over that fd.

I would appreciate if some one could give me few pointers on how to open the ethernet device

at xyzif.c

Since ethernet device no more exposes any device for "eth0", how can I get the device interface? So that I can follow the same logic to set IP, GW and subnet mask and bring up the

ethernet device.

 

Thanks in advance for your valuable suggestions,

-subbu.

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